Google Git Google Git
Sign in
llvm/llvm-project/74a387bf24b358f0038ea18cc3f433e4a4cef37d/./clang/lib/CodeGen/CGExprScalar.cpp
blob: 25b568feeeffee903fd9ea934828400760265699 [file]
//===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Expr nodes with scalar LLVM types as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CGCXXABI.h"
#include "CGCleanup.h"
#include "CGDebugInfo.h"
#include "CGHLSLRuntime.h"
#include "CGObjCRuntime.h"
#include "CGOpenMPRuntime.h"
#include "CGRecordLayout.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "ConstantEmitter.h"
#include "TargetInfo.h"
#include "TrapReasonBuilder.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/MatrixUtils.h"
#include "clang/AST/ParentMapContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/DiagnosticTrap.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGenUtils/ExprUtils.h"
#include "llvm/ADT/APFixedPoint.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/FixedPointBuilder.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GEPNoWrapFlags.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsPowerPC.h"
#include "llvm/IR/IntrinsicsWebAssembly.h"
#include "llvm/IR/MatrixBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/TypeSize.h"
#include <cstdarg>
#include <optional>
using namespace clang;
using namespace CodeGen;
using llvm::Value;
//===----------------------------------------------------------------------===//
// Scalar Expression Emitter
//===----------------------------------------------------------------------===//
namespace llvm {
extern cl::opt<bool> EnableSingleByteCoverage;
} // namespace llvm
namespace {
/// Determine whether the given binary operation may overflow.
/// Sets \p Result to the value of the operation for BO_Add, BO_Sub, BO_Mul,
/// and signed BO_{Div,Rem}. For these opcodes, and for unsigned BO_{Div,Rem},
/// the returned overflow check is precise. The returned value is 'true' for
/// all other opcodes, to be conservative.
bool mayHaveIntegerOverflow(llvm::ConstantInt *LHS, llvm::ConstantInt *RHS,
BinaryOperator::Opcode Opcode, bool Signed,
llvm::APInt &Result) {
// Assume overflow is possible, unless we can prove otherwise.
bool Overflow = true;
const auto &LHSAP = LHS->getValue();
const auto &RHSAP = RHS->getValue();
if (Opcode == BO_Add) {
Result = Signed ? LHSAP.sadd_ov(RHSAP, Overflow)
: LHSAP.uadd_ov(RHSAP, Overflow);
} else if (Opcode == BO_Sub) {
Result = Signed ? LHSAP.ssub_ov(RHSAP, Overflow)
: LHSAP.usub_ov(RHSAP, Overflow);
} else if (Opcode == BO_Mul) {
Result = Signed ? LHSAP.smul_ov(RHSAP, Overflow)
: LHSAP.umul_ov(RHSAP, Overflow);
} else if (Opcode == BO_Div || Opcode == BO_Rem) {
if (Signed && !RHS->isZero())
Result = LHSAP.sdiv_ov(RHSAP, Overflow);
else
return false;
}
return Overflow;
}
struct BinOpInfo {
Value *LHS;
Value *RHS;
QualType Ty; // Computation Type.
BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
FPOptions FPFeatures;
const Expr *E; // Entire expr, for error unsupported. May not be binop.
/// Check if the binop can result in integer overflow.
bool mayHaveIntegerOverflow() const {
// Without constant input, we can't rule out overflow.
auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS);
auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS);
if (!LHSCI || !RHSCI)
return true;
llvm::APInt Result;
return ::mayHaveIntegerOverflow(
LHSCI, RHSCI, Opcode, Ty->hasSignedIntegerRepresentation(), Result);
}
/// Check if the binop computes a division or a remainder.
bool isDivremOp() const {
return Opcode == BO_Div || Opcode == BO_Rem || Opcode == BO_DivAssign ||
Opcode == BO_RemAssign;
}
/// Check if the binop can result in an integer division by zero.
bool mayHaveIntegerDivisionByZero() const {
if (isDivremOp())
if (auto *CI = dyn_cast<llvm::ConstantInt>(RHS))
return CI->isZero();
return true;
}
/// Check if the binop can result in a float division by zero.
bool mayHaveFloatDivisionByZero() const {
if (isDivremOp())
if (auto *CFP = dyn_cast<llvm::ConstantFP>(RHS))
return CFP->isZero();
return true;
}
/// Check if at least one operand is a fixed point type. In such cases, this
/// operation did not follow usual arithmetic conversion and both operands
/// might not be of the same type.
bool isFixedPointOp() const {
// We cannot simply check the result type since comparison operations return
// an int.
if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) {
QualType LHSType = BinOp->getLHS()->getType();
QualType RHSType = BinOp->getRHS()->getType();
return LHSType->isFixedPointType() || RHSType->isFixedPointType();
}
if (const auto *UnOp = dyn_cast<UnaryOperator>(E))
return UnOp->getSubExpr()->getType()->isFixedPointType();
return false;
}
/// Check if the RHS has a signed integer representation.
bool rhsHasSignedIntegerRepresentation() const {
if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) {
QualType RHSType = BinOp->getRHS()->getType();
return RHSType->hasSignedIntegerRepresentation();
}
return false;
}
};
static bool MustVisitNullValue(const Expr *E) {
// If a null pointer expression's type is the C++0x nullptr_t, then
// it's not necessarily a simple constant and it must be evaluated
// for its potential side effects.
return E->getType()->isNullPtrType();
}
/// If \p E is a widened promoted integer, get its base (unpromoted) type.
static std::optional<QualType> getUnwidenedIntegerType(const ASTContext &Ctx,
const Expr *E) {
const Expr *Base = E->IgnoreImpCasts();
if (E == Base)
return std::nullopt;
QualType BaseTy = Base->getType();
if (!Ctx.isPromotableIntegerType(BaseTy) ||
Ctx.getTypeSize(BaseTy) >= Ctx.getTypeSize(E->getType()))
return std::nullopt;
return BaseTy;
}
/// Check if \p E is a widened promoted integer.
static bool IsWidenedIntegerOp(const ASTContext &Ctx, const Expr *E) {
return getUnwidenedIntegerType(Ctx, E).has_value();
}
/// Consider OverflowBehaviorType and language options to calculate the final
/// overflow behavior for an expression. There are no language options for
/// unsigned overflow semantics so there is nothing to consider there.
static LangOptions::OverflowBehaviorKind
getOverflowBehaviorConsideringType(const CodeGenFunction &CGF,
const QualType Ty) {
const OverflowBehaviorType *OBT = Ty->getAs<OverflowBehaviorType>();
/// FIXME: Having two enums named `OverflowBehaviorKind` is not ideal, these
/// should be unified into one coherent enum that supports both unsigned and
/// signed overflow behavior semantics.
if (OBT) {
switch (OBT->getBehaviorKind()) {
case OverflowBehaviorType::OverflowBehaviorKind::Wrap:
return LangOptions::OverflowBehaviorKind::OB_Wrap;
case OverflowBehaviorType::OverflowBehaviorKind::Trap:
return LangOptions::OverflowBehaviorKind::OB_Trap;
}
llvm_unreachable("Unknown OverflowBehaviorKind");
}
if (Ty->isUnsignedIntegerType()) {
return LangOptions::OverflowBehaviorKind::OB_Unset;
}
switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
case LangOptions::SignedOverflowBehaviorTy::SOB_Defined:
return LangOptions::OverflowBehaviorKind::OB_SignedAndDefined;
case LangOptions::SignedOverflowBehaviorTy::SOB_Undefined:
return LangOptions::OverflowBehaviorKind::OB_Unset;
case LangOptions::SignedOverflowBehaviorTy::SOB_Trapping:
return LangOptions::OverflowBehaviorKind::OB_Trap;
}
llvm_unreachable("Unknown SignedOverflowBehaviorTy");
}
/// Check if we can skip the overflow check for \p Op.
static bool CanElideOverflowCheck(ASTContext &Ctx, const BinOpInfo &Op) {
assert((isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) &&
"Expected a unary or binary operator");
// If the binop has constant inputs and we can prove there is no overflow,
// we can elide the overflow check.
if (!Op.mayHaveIntegerOverflow())
return true;
const UnaryOperator *UO = dyn_cast<UnaryOperator>(Op.E);
if (UO && Ctx.isUnaryOverflowPatternExcluded(UO))
return true;
const auto *BO = dyn_cast<BinaryOperator>(Op.E);
if (BO && BO->hasExcludedOverflowPattern())
return true;
if (Op.Ty.isWrapType())
return true;
if (Op.Ty.isTrapType())
return false;
if (Op.Ty->isSignedIntegerType() &&
Ctx.isTypeIgnoredBySanitizer(SanitizerKind::SignedIntegerOverflow,
Op.Ty)) {
return true;
}
if (Op.Ty->isUnsignedIntegerType() &&
Ctx.isTypeIgnoredBySanitizer(SanitizerKind::UnsignedIntegerOverflow,
Op.Ty)) {
return true;
}
// If a unary op has a widened operand, the op cannot overflow.
if (UO)
return !UO->canOverflow();
// We usually don't need overflow checks for binops with widened operands.
// Multiplication with promoted unsigned operands is a special case.
auto OptionalLHSTy = getUnwidenedIntegerType(Ctx, BO->getLHS());
if (!OptionalLHSTy)
return false;
auto OptionalRHSTy = getUnwidenedIntegerType(Ctx, BO->getRHS());
if (!OptionalRHSTy)
return false;
QualType LHSTy = *OptionalLHSTy;
QualType RHSTy = *OptionalRHSTy;
// This is the simple case: binops without unsigned multiplication, and with
// widened operands. No overflow check is needed here.
if ((Op.Opcode != BO_Mul && Op.Opcode != BO_MulAssign) ||
!LHSTy->isUnsignedIntegerType() || !RHSTy->isUnsignedIntegerType())
return true;
// For unsigned multiplication the overflow check can be elided if either one
// of the unpromoted types are less than half the size of the promoted type.
unsigned PromotedSize = Ctx.getTypeSize(Op.E->getType());
return (2 * Ctx.getTypeSize(LHSTy)) < PromotedSize ||
(2 * Ctx.getTypeSize(RHSTy)) < PromotedSize;
}
class ScalarExprEmitter
: public StmtVisitor<ScalarExprEmitter, Value*> {
CodeGenFunction &CGF;
CGBuilderTy &Builder;
bool IgnoreResultAssign;
llvm::LLVMContext &VMContext;
public:
ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
: CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
VMContext(cgf.getLLVMContext()) {
}
//===--------------------------------------------------------------------===//
// Utilities
//===--------------------------------------------------------------------===//
bool TestAndClearIgnoreResultAssign() {
bool I = IgnoreResultAssign;
IgnoreResultAssign = false;
return I;
}
llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
return CGF.EmitCheckedLValue(E, TCK);
}
void EmitBinOpCheck(
ArrayRef<std::pair<Value *, SanitizerKind::SanitizerOrdinal>> Checks,
const BinOpInfo &Info);
Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal();
}
void EmitLValueAlignmentAssumption(const Expr *E, Value *V) {
const AlignValueAttr *AVAttr = nullptr;
if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
const ValueDecl *VD = DRE->getDecl();
if (VD->getType()->isReferenceType()) {
if (const auto *TTy =
VD->getType().getNonReferenceType()->getAs<TypedefType>())
AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
} else {
// Assumptions for function parameters are emitted at the start of the
// function, so there is no need to repeat that here,
// unless the alignment-assumption sanitizer is enabled,
// then we prefer the assumption over alignment attribute
// on IR function param.
if (isa<ParmVarDecl>(VD) && !CGF.SanOpts.has(SanitizerKind::Alignment))
return;
AVAttr = VD->getAttr<AlignValueAttr>();
}
}
if (!AVAttr)
if (const auto *TTy = E->getType()->getAs<TypedefType>())
AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>();
if (!AVAttr)
return;
Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment());
llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue);
CGF.emitAlignmentAssumption(V, E, AVAttr->getLocation(), AlignmentCI);
}
/// EmitLoadOfLValue - Given an expression with complex type that represents a
/// value l-value, this method emits the address of the l-value, then loads
/// and returns the result.
Value *EmitLoadOfLValue(const Expr *E) {
Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load),
E->getExprLoc());
EmitLValueAlignmentAssumption(E, V);
return V;
}
/// EmitConversionToBool - Convert the specified expression value to a
/// boolean (i1) truth value. This is equivalent to "Val != 0".
Value *EmitConversionToBool(Value *Src, QualType DstTy);
/// Emit a check that a conversion from a floating-point type does not
/// overflow.
void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
Value *Src, QualType SrcType, QualType DstType,
llvm::Type *DstTy, SourceLocation Loc);
/// Known implicit conversion check kinds.
/// This is used for bitfield conversion checks as well.
/// Keep in sync with the enum of the same name in ubsan_handlers.h
enum ImplicitConversionCheckKind : unsigned char {
ICCK_IntegerTruncation = 0, // Legacy, was only used by clang 7.
ICCK_UnsignedIntegerTruncation = 1,
ICCK_SignedIntegerTruncation = 2,
ICCK_IntegerSignChange = 3,
ICCK_SignedIntegerTruncationOrSignChange = 4,
};
/// Emit a check that an [implicit] truncation of an integer does not
/// discard any bits. It is not UB, so we use the value after truncation.
void EmitIntegerTruncationCheck(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, SourceLocation Loc,
bool OBTrapInvolved = false);
/// Emit a check that an [implicit] conversion of an integer does not change
/// the sign of the value. It is not UB, so we use the value after conversion.
/// NOTE: Src and Dst may be the exact same value! (point to the same thing)
void EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, SourceLocation Loc,
bool OBTrapInvolved = false);
/// Emit a conversion from the specified type to the specified destination
/// type, both of which are LLVM scalar types.
struct ScalarConversionOpts {
bool TreatBooleanAsSigned;
bool EmitImplicitIntegerTruncationChecks;
bool EmitImplicitIntegerSignChangeChecks;
/* Potential -fsanitize-undefined-ignore-overflow-pattern= */
bool PatternExcluded;
ScalarConversionOpts()
: TreatBooleanAsSigned(false),
EmitImplicitIntegerTruncationChecks(false),
EmitImplicitIntegerSignChangeChecks(false), PatternExcluded(false) {}
ScalarConversionOpts(clang::SanitizerSet SanOpts)
: TreatBooleanAsSigned(false),
EmitImplicitIntegerTruncationChecks(
SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)),
EmitImplicitIntegerSignChangeChecks(
SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)),
PatternExcluded(false) {}
};
Value *EmitScalarCast(Value *Src, QualType SrcType, QualType DstType,
llvm::Type *SrcTy, llvm::Type *DstTy,
ScalarConversionOpts Opts);
Value *
EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
SourceLocation Loc,
ScalarConversionOpts Opts = ScalarConversionOpts());
/// Convert between either a fixed point and other fixed point or fixed point
/// and an integer.
Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy,
SourceLocation Loc);
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
QualType SrcTy, QualType DstTy,
SourceLocation Loc);
/// EmitNullValue - Emit a value that corresponds to null for the given type.
Value *EmitNullValue(QualType Ty);
/// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
Value *EmitFloatToBoolConversion(Value *V) {
// Compare against 0.0 for fp scalars.
llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
return Builder.CreateFCmpUNE(V, Zero, "tobool");
}
/// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
Value *EmitPointerToBoolConversion(Value *V, QualType QT) {
Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT);
return Builder.CreateICmpNE(V, Zero, "tobool");
}
Value *EmitIntToBoolConversion(Value *V) {
// Because of the type rules of C, we often end up computing a
// logical value, then zero extending it to int, then wanting it
// as a logical value again. Optimize this common case.
if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
Value *Result = ZI->getOperand(0);
// If there aren't any more uses, zap the instruction to save space.
// Note that there can be more uses, for example if this
// is the result of an assignment.
if (ZI->use_empty())
ZI->eraseFromParent();
return Result;
}
}
return Builder.CreateIsNotNull(V, "tobool");
}
//===--------------------------------------------------------------------===//
// Visitor Methods
//===--------------------------------------------------------------------===//
Value *Visit(Expr *E) {
ApplyDebugLocation DL(CGF, E);
return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
}
Value *VisitStmt(Stmt *S) {
S->dump(llvm::errs(), CGF.getContext());
llvm_unreachable("Stmt can't have complex result type!");
}
Value *VisitExpr(Expr *S);
Value *VisitConstantExpr(ConstantExpr *E) {
// A constant expression of type 'void' generates no code and produces no
// value.
if (E->getType()->isVoidType())
return nullptr;
if (Value *Result = ConstantEmitter(CGF).tryEmitConstantExpr(E)) {
if (E->isGLValue()) {
// This was already converted to an rvalue when it was constant
// evaluated.
if (E->hasAPValueResult() && !E->getAPValueResult().isLValue())
return Result;
return CGF.EmitLoadOfScalar(
Address(Result, CGF.convertTypeForLoadStore(E->getType()),
CGF.getContext().getTypeAlignInChars(E->getType())),
/*Volatile*/ false, E->getType(), E->getExprLoc());
}
return Result;
}
return Visit(E->getSubExpr());
}
Value *VisitParenExpr(ParenExpr *PE) {
return Visit(PE->getSubExpr());
}
Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
return Visit(E->getReplacement());
}
Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
return Visit(GE->getResultExpr());
}
Value *VisitCoawaitExpr(CoawaitExpr *S) {
return CGF.EmitCoawaitExpr(*S).getScalarVal();
}
Value *VisitCoyieldExpr(CoyieldExpr *S) {
return CGF.EmitCoyieldExpr(*S).getScalarVal();
}
Value *VisitUnaryCoawait(const UnaryOperator *E) {
return Visit(E->getSubExpr());
}
// Leaves.
Value *VisitIntegerLiteral(const IntegerLiteral *E) {
return Builder.getInt(E->getValue());
}
Value *VisitFixedPointLiteral(const FixedPointLiteral *E) {
return Builder.getInt(E->getValue());
}
Value *VisitFloatingLiteral(const FloatingLiteral *E) {
return llvm::ConstantFP::get(VMContext, E->getValue());
}
Value *VisitCharacterLiteral(const CharacterLiteral *E) {
// Character literals are always stored in an unsigned (even for signed
// char), so allow implicit truncation here.
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue(),
/*IsSigned=*/false, /*ImplicitTrunc=*/true);
}
Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
if (E->getType()->isVoidType())
return nullptr;
return EmitNullValue(E->getType());
}
Value *VisitGNUNullExpr(const GNUNullExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitOffsetOfExpr(OffsetOfExpr *E);
Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
return Builder.CreateBitCast(V, ConvertType(E->getType()));
}
Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
}
Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
return CGF.EmitPseudoObjectRValue(E).getScalarVal();
}
Value *VisitSYCLUniqueStableNameExpr(SYCLUniqueStableNameExpr *E);
Value *VisitEmbedExpr(EmbedExpr *E);
Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
if (E->isGLValue())
return EmitLoadOfLValue(CGF.getOrCreateOpaqueLValueMapping(E),
E->getExprLoc());
// Otherwise, assume the mapping is the scalar directly.
return CGF.getOrCreateOpaqueRValueMapping(E).getScalarVal();
}
Value *VisitOpenACCAsteriskSizeExpr(OpenACCAsteriskSizeExpr *E) {
llvm_unreachable("Codegen for this isn't defined/implemented");
}
// l-values.
Value *VisitDeclRefExpr(DeclRefExpr *E) {
if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E))
return CGF.emitScalarConstant(Constant, E);
return EmitLoadOfLValue(E);
}
Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
return CGF.EmitObjCSelectorExpr(E);
}
Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
return CGF.EmitObjCProtocolExpr(E);
}
Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
return EmitLoadOfLValue(E);
}
Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
if (E->getMethodDecl() &&
E->getMethodDecl()->getReturnType()->isReferenceType())
return EmitLoadOfLValue(E);
return CGF.EmitObjCMessageExpr(E).getScalarVal();
}
Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
LValue LV = CGF.EmitObjCIsaExpr(E);
Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal();
return V;
}
Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) {
VersionTuple Version = E->getVersion();
// If we're checking for a platform older than our minimum deployment
// target, we can fold the check away.
if (Version <= CGF.CGM.getTarget().getPlatformMinVersion())
return llvm::ConstantInt::get(Builder.getInt1Ty(), 1);
return CGF.EmitBuiltinAvailable(Version);
}
Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
Value *VisitMatrixSingleSubscriptExpr(MatrixSingleSubscriptExpr *E);
Value *VisitMatrixSubscriptExpr(MatrixSubscriptExpr *E);
Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
Value *VisitConvertVectorExpr(ConvertVectorExpr *E);
Value *VisitMemberExpr(MemberExpr *E);
Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitMatrixElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
// Strictly speaking, we shouldn't be calling EmitLoadOfLValue, which
// transitively calls EmitCompoundLiteralLValue, here in C++ since compound
// literals aren't l-values in C++. We do so simply because that's the
// cleanest way to handle compound literals in C++.
// See the discussion here: https://reviews.llvm.org/D64464
return EmitLoadOfLValue(E);
}
Value *VisitInitListExpr(InitListExpr *E);
Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
assert(CGF.getArrayInitIndex() &&
"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?");
return CGF.getArrayInitIndex();
}
Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
CGF.CGM.EmitExplicitCastExprType(E, &CGF);
return VisitCastExpr(E);
}
Value *VisitCastExpr(CastExpr *E);
Value *VisitCallExpr(const CallExpr *E) {
if (E->getCallReturnType(CGF.getContext())->isReferenceType())
return EmitLoadOfLValue(E);
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
Value *V = CGF.EmitCallExpr(E).getScalarVal();
EmitLValueAlignmentAssumption(E, V);
return V;
}
Value *VisitStmtExpr(const StmtExpr *E);
// Unary Operators.
// '++' and '--' read and write their operand, so it must be an object, not
// just an address.
Value *VisitUnaryPostDec(const UnaryOperator *E) {
LValue LV = CGF.EmitAccessedLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, false, false);
}
Value *VisitUnaryPostInc(const UnaryOperator *E) {
LValue LV = CGF.EmitAccessedLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, true, false);
}
Value *VisitUnaryPreDec(const UnaryOperator *E) {
LValue LV = CGF.EmitAccessedLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, false, true);
}
Value *VisitUnaryPreInc(const UnaryOperator *E) {
LValue LV = CGF.EmitAccessedLValue(E->getSubExpr());
return EmitScalarPrePostIncDec(E, LV, true, true);
}
llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E,
llvm::Value *InVal,
bool IsInc);
llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
bool isInc, bool isPre);
Value *VisitUnaryAddrOf(const UnaryOperator *E) {
if (isa<MemberPointerType>(E->getType())) // never sugared
return CGF.CGM.getMemberPointerConstant(E);
return EmitLValue(E->getSubExpr()).getPointer(CGF);
}
Value *VisitUnaryDeref(const UnaryOperator *E) {
if (E->getType()->isVoidType())
return Visit(E->getSubExpr()); // the actual value should be unused
return EmitLoadOfLValue(E);
}
Value *VisitUnaryPlus(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitPlus(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryMinus(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitMinus(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryNot (const UnaryOperator *E);
Value *VisitUnaryLNot (const UnaryOperator *E);
Value *VisitUnaryReal(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitReal(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryImag(const UnaryOperator *E,
QualType PromotionType = QualType());
Value *VisitImag(const UnaryOperator *E, QualType PromotionType);
Value *VisitUnaryExtension(const UnaryOperator *E) {
return Visit(E->getSubExpr());
}
// C++
Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
return EmitLoadOfLValue(E);
}
Value *VisitSourceLocExpr(SourceLocExpr *SLE) {
auto &Ctx = CGF.getContext();
APValue Evaluated =
SLE->EvaluateInContext(Ctx, CGF.CurSourceLocExprScope.getDefaultExpr());
return ConstantEmitter(CGF).emitAbstract(SLE->getLocation(), Evaluated,
SLE->getType());
}
Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE);
return Visit(DAE->getExpr());
}
Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) {
CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE);
return Visit(DIE->getExpr());
}
Value *VisitCXXThisExpr(CXXThisExpr *TE) {
return CGF.LoadCXXThis();
}
Value *VisitExprWithCleanups(ExprWithCleanups *E);
Value *VisitCXXNewExpr(const CXXNewExpr *E) {
return CGF.EmitCXXNewExpr(E);
}
Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
CGF.EmitCXXDeleteExpr(E);
return nullptr;
}
Value *VisitTypeTraitExpr(const TypeTraitExpr *E) {
if (E->isStoredAsBoolean())
return llvm::ConstantInt::get(ConvertType(E->getType()),
E->getBoolValue());
assert(E->getType()->isIntegerType() && "not a scalar type trait");
assert(E->getAPValue().isInt() && "APValue type not supported");
return llvm::ConstantInt::get(ConvertType(E->getType()),
E->getAPValue().getInt());
}
Value *VisitConceptSpecializationExpr(const ConceptSpecializationExpr *E) {
return Builder.getInt1(E->isSatisfied());
}
Value *VisitRequiresExpr(const RequiresExpr *E) {
return Builder.getInt1(E->isSatisfied());
}
Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
}
Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
// C++ [expr.pseudo]p1:
// The result shall only be used as the operand for the function call
// operator (), and the result of such a call has type void. The only
// effect is the evaluation of the postfix-expression before the dot or
// arrow.
CGF.EmitScalarExpr(E->getBase());
return nullptr;
}
Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
return EmitNullValue(E->getType());
}
Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
CGF.EmitCXXThrowExpr(E);
return nullptr;
}
Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
return Builder.getInt1(E->getValue());
}
// Binary Operators.
Value *EmitMul(const BinOpInfo &Ops) {
if (Ops.Ty->isSignedIntegerOrEnumerationType() ||
Ops.Ty->isUnsignedIntegerType()) {
const bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
const bool hasSan =
isSigned ? CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)
: CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow);
switch (getOverflowBehaviorConsideringType(CGF, Ops.Ty)) {
case LangOptions::OB_Wrap:
return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
case LangOptions::OB_SignedAndDefined:
if (!hasSan)
return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
[[fallthrough]];
case LangOptions::OB_Unset:
if (!hasSan)
return isSigned ? Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul")
: Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
[[fallthrough]];
case LangOptions::OB_Trap:
if (CanElideOverflowCheck(CGF.getContext(), Ops))
return isSigned ? Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul")
: Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
return EmitOverflowCheckedBinOp(Ops);
}
}
if (Ops.Ty->isConstantMatrixType()) {
llvm::MatrixBuilder MB(Builder);
// We need to check the types of the operands of the operator to get the
// correct matrix dimensions.
auto *BO = cast<BinaryOperator>(Ops.E);
auto *LHSMatTy = dyn_cast<ConstantMatrixType>(
BO->getLHS()->getType().getCanonicalType());
auto *RHSMatTy = dyn_cast<ConstantMatrixType>(
BO->getRHS()->getType().getCanonicalType());
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
if (LHSMatTy && RHSMatTy)
return MB.CreateMatrixMultiply(Ops.LHS, Ops.RHS, LHSMatTy->getNumRows(),
LHSMatTy->getNumColumns(),
RHSMatTy->getNumColumns());
return MB.CreateScalarMultiply(Ops.LHS, Ops.RHS);
}
if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
// Preserve the old values
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
}
if (Ops.isFixedPointOp())
return EmitFixedPointBinOp(Ops);
return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
}
/// Create a binary op that checks for overflow.
/// Currently only supports +, - and *.
Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
// Check for undefined division and modulus behaviors.
void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
llvm::Value *Zero,bool isDiv);
// Common helper for getting how wide LHS of shift is.
static Value *GetMaximumShiftAmount(Value *LHS, Value *RHS, bool RHSIsSigned);
// Used for shifting constraints for OpenCL, do mask for powers of 2, URem for
// non powers of two.
Value *ConstrainShiftValue(Value *LHS, Value *RHS, const Twine &Name);
Value *EmitDiv(const BinOpInfo &Ops);
Value *EmitRem(const BinOpInfo &Ops);
Value *EmitAdd(const BinOpInfo &Ops);
Value *EmitSub(const BinOpInfo &Ops);
Value *EmitShl(const BinOpInfo &Ops);
Value *EmitShr(const BinOpInfo &Ops);
Value *EmitAnd(const BinOpInfo &Ops) {
return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
}
Value *EmitXor(const BinOpInfo &Ops) {
return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
}
Value *EmitOr (const BinOpInfo &Ops) {
return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
}
// Helper functions for fixed point binary operations.
Value *EmitFixedPointBinOp(const BinOpInfo &Ops);
BinOpInfo EmitBinOps(const BinaryOperator *E,
QualType PromotionTy = QualType());
Value *EmitPromotedValue(Value *result, QualType PromotionType);
Value *EmitUnPromotedValue(Value *result, QualType ExprType);
Value *EmitPromoted(const Expr *E, QualType PromotionType);
LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
Value *&Result);
Value *EmitCompoundAssign(const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
QualType getPromotionType(QualType Ty) {
const auto &Ctx = CGF.getContext();
if (auto *CT = Ty->getAs<ComplexType>()) {
QualType ElementType = CT->getElementType();
if (ElementType.UseExcessPrecision(Ctx))
return Ctx.getComplexType(Ctx.FloatTy);
}
if (Ty.UseExcessPrecision(Ctx)) {
if (auto *VT = Ty->getAs<VectorType>()) {
unsigned NumElements = VT->getNumElements();
return Ctx.getVectorType(Ctx.FloatTy, NumElements, VT->getVectorKind());
}
return Ctx.FloatTy;
}
return QualType();
}
// Binary operators and binary compound assignment operators.
#define HANDLEBINOP(OP) \
Value *VisitBin##OP(const BinaryOperator *E) { \
QualType promotionTy = getPromotionType(E->getType()); \
auto result = Emit##OP(EmitBinOps(E, promotionTy)); \
if (result && !promotionTy.isNull()) \
result = EmitUnPromotedValue(result, E->getType()); \
return result; \
} \
Value *VisitBin##OP##Assign(const CompoundAssignOperator *E) { \
ApplyAtomGroup Grp(CGF.getDebugInfo()); \
return EmitCompoundAssign(E, &ScalarExprEmitter::Emit##OP); \
}
HANDLEBINOP(Mul)
HANDLEBINOP(Div)
HANDLEBINOP(Rem)
HANDLEBINOP(Add)
HANDLEBINOP(Sub)
HANDLEBINOP(Shl)
HANDLEBINOP(Shr)
HANDLEBINOP(And)
HANDLEBINOP(Xor)
HANDLEBINOP(Or)
#undef HANDLEBINOP
// Comparisons.
Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc,
llvm::CmpInst::Predicate SICmpOpc,
llvm::CmpInst::Predicate FCmpOpc, bool IsSignaling);
#define VISITCOMP(CODE, UI, SI, FP, SIG) \
Value *VisitBin##CODE(const BinaryOperator *E) { \
return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
llvm::FCmpInst::FP, SIG); }
VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT, true)
VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT, true)
VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE, true)
VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE, true)
VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ, false)
VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE, false)
#undef VISITCOMP
Value *VisitBinAssign (const BinaryOperator *E);
Value *VisitBinLAnd (const BinaryOperator *E);
Value *VisitBinLOr (const BinaryOperator *E);
Value *VisitBinComma (const BinaryOperator *E);
Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
Value *VisitCXXRewrittenBinaryOperator(CXXRewrittenBinaryOperator *E) {
return Visit(E->getSemanticForm());
}
// Other Operators.
Value *VisitBlockExpr(const BlockExpr *BE);
Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
Value *VisitChooseExpr(ChooseExpr *CE);
Value *VisitVAArgExpr(VAArgExpr *VE);
Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
return CGF.EmitObjCStringLiteral(E);
}
Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
return CGF.EmitObjCBoxedExpr(E);
}
Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
return CGF.EmitObjCArrayLiteral(E);
}
Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
return CGF.EmitObjCDictionaryLiteral(E);
}
Value *VisitAsTypeExpr(AsTypeExpr *CE);
Value *VisitAtomicExpr(AtomicExpr *AE);
Value *VisitPackIndexingExpr(PackIndexingExpr *E) {
return Visit(E->getSelectedExpr());
}
};
} // end anonymous namespace.
//===----------------------------------------------------------------------===//
// Utilities
//===----------------------------------------------------------------------===//
/// EmitConversionToBool - Convert the specified expression value to a
/// boolean (i1) truth value. This is equivalent to "Val != 0".
Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
if (SrcType->isRealFloatingType())
return EmitFloatToBoolConversion(Src);
if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
// The conversion is a NOP, and will be done when CodeGening the builtin.
if (SrcType == CGF.getContext().AMDGPUFeaturePredicateTy)
return Src;
assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
"Unknown scalar type to convert");
if (isa<llvm::IntegerType>(Src->getType()))
return EmitIntToBoolConversion(Src);
assert(isa<llvm::PointerType>(Src->getType()));
return EmitPointerToBoolConversion(Src, SrcType);
}
void ScalarExprEmitter::EmitFloatConversionCheck(
Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType,
QualType DstType, llvm::Type *DstTy, SourceLocation Loc) {
assert(SrcType->isFloatingType() && "not a conversion from floating point");
if (!isa<llvm::IntegerType>(DstTy))
return;
auto CheckOrdinal = SanitizerKind::SO_FloatCastOverflow;
auto CheckHandler = SanitizerHandler::FloatCastOverflow;
SanitizerDebugLocation SanScope(&CGF, {CheckOrdinal}, CheckHandler);
using llvm::APFloat;
using llvm::APSInt;
llvm::Value *Check = nullptr;
const llvm::fltSemantics &SrcSema =
CGF.getContext().getFloatTypeSemantics(OrigSrcType);
// Floating-point to integer. This has undefined behavior if the source is
// +-Inf, NaN, or doesn't fit into the destination type (after truncation
// to an integer).
unsigned Width = CGF.getContext().getIntWidth(DstType);
bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
APSInt Min = APSInt::getMinValue(Width, Unsigned);
APFloat MinSrc(SrcSema, APFloat::uninitialized);
if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
APFloat::opOverflow)
// Don't need an overflow check for lower bound. Just check for
// -Inf/NaN.
MinSrc = APFloat::getInf(SrcSema, true);
else
// Find the largest value which is too small to represent (before
// truncation toward zero).
MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative);
APSInt Max = APSInt::getMaxValue(Width, Unsigned);
APFloat MaxSrc(SrcSema, APFloat::uninitialized);
if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
APFloat::opOverflow)
// Don't need an overflow check for upper bound. Just check for
// +Inf/NaN.
MaxSrc = APFloat::getInf(SrcSema, false);
else
// Find the smallest value which is too large to represent (before
// truncation toward zero).
MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive);
// If we're converting from __half, convert the range to float to match
// the type of src.
if (OrigSrcType->isHalfType()) {
const llvm::fltSemantics &Sema =
CGF.getContext().getFloatTypeSemantics(SrcType);
bool IsInexact;
MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
}
llvm::Value *GE =
Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc));
llvm::Value *LE =
Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
Check = Builder.CreateAnd(GE, LE);
llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc),
CGF.EmitCheckTypeDescriptor(OrigSrcType),
CGF.EmitCheckTypeDescriptor(DstType)};
CGF.EmitCheck(std::make_pair(Check, CheckOrdinal), CheckHandler, StaticArgs,
OrigSrc);
}
// Should be called within CodeGenFunction::SanitizerScope RAII scope.
// Returns 'i1 false' when the truncation Src -> Dst was lossy.
static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
EmitIntegerTruncationCheckHelper(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, CGBuilderTy &Builder) {
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = Dst->getType();
(void)DstTy; // Only used in assert()
// This should be truncation of integral types.
assert(Src != Dst);
assert(SrcTy->getScalarSizeInBits() > Dst->getType()->getScalarSizeInBits());
assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&
"non-integer llvm type");
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
// If both (src and dst) types are unsigned, then it's an unsigned truncation.
// Else, it is a signed truncation.
ScalarExprEmitter::ImplicitConversionCheckKind Kind;
SanitizerKind::SanitizerOrdinal Ordinal;
if (!SrcSigned && !DstSigned) {
Kind = ScalarExprEmitter::ICCK_UnsignedIntegerTruncation;
Ordinal = SanitizerKind::SO_ImplicitUnsignedIntegerTruncation;
} else {
Kind = ScalarExprEmitter::ICCK_SignedIntegerTruncation;
Ordinal = SanitizerKind::SO_ImplicitSignedIntegerTruncation;
}
llvm::Value *Check = nullptr;
// 1. Extend the truncated value back to the same width as the Src.
Check = Builder.CreateIntCast(Dst, SrcTy, DstSigned, "anyext");
// 2. Equality-compare with the original source value
Check = Builder.CreateICmpEQ(Check, Src, "truncheck");
// If the comparison result is 'i1 false', then the truncation was lossy.
return std::make_pair(Kind, std::make_pair(Check, Ordinal));
}
static bool PromotionIsPotentiallyEligibleForImplicitIntegerConversionCheck(
QualType SrcType, QualType DstType) {
return SrcType->isIntegerType() && DstType->isIntegerType();
}
void ScalarExprEmitter::EmitIntegerTruncationCheck(Value *Src, QualType SrcType,
Value *Dst, QualType DstType,
SourceLocation Loc,
bool OBTrapInvolved) {
if (!CGF.SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation) &&
!OBTrapInvolved)
return;
// We only care about int->int conversions here.
// We ignore conversions to/from pointer and/or bool.
if (!PromotionIsPotentiallyEligibleForImplicitIntegerConversionCheck(SrcType,
DstType))
return;
unsigned SrcBits = Src->getType()->getScalarSizeInBits();
unsigned DstBits = Dst->getType()->getScalarSizeInBits();
// This must be truncation. Else we do not care.
if (SrcBits <= DstBits)
return;
assert(!DstType->isBooleanType() && "we should not get here with booleans.");
// If the integer sign change sanitizer is enabled,
// and we are truncating from larger unsigned type to smaller signed type,
// let that next sanitizer deal with it.
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
if (CGF.SanOpts.has(SanitizerKind::ImplicitIntegerSignChange) &&
(!SrcSigned && DstSigned))
return;
std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
Check;
auto CheckHandler = SanitizerHandler::ImplicitConversion;
{
// We don't know the check kind until we call
// EmitIntegerTruncationCheckHelper, but we want to annotate
// EmitIntegerTruncationCheckHelper's instructions too.
SanitizerDebugLocation SanScope(
&CGF,
{SanitizerKind::SO_ImplicitUnsignedIntegerTruncation,
SanitizerKind::SO_ImplicitSignedIntegerTruncation},
CheckHandler);
Check =
EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder);
// If the comparison result is 'i1 false', then the truncation was lossy.
}
// Do we care about this type of truncation?
if (!CGF.SanOpts.has(Check.second.second)) {
// Just emit a trap check if an __ob_trap was involved but appropriate
// sanitizer isn't enabled.
if (OBTrapInvolved)
CGF.EmitTrapCheck(Check.second.first, CheckHandler);
return;
}
SanitizerDebugLocation SanScope(&CGF, {Check.second.second}, CheckHandler);
// Does some SSCL ignore this type?
const bool ignoredBySanitizer = CGF.getContext().isTypeIgnoredBySanitizer(
SanitizerMask::bitPosToMask(Check.second.second), DstType);
// Consider OverflowBehaviorTypes which override SSCL type entries for
// truncation sanitizers.
if (const auto *OBT = DstType->getAs<OverflowBehaviorType>()) {
if (OBT->isWrapKind())
return;
}
if (ignoredBySanitizer && !OBTrapInvolved)
return;
llvm::Constant *StaticArgs[] = {
CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType),
CGF.EmitCheckTypeDescriptor(DstType),
llvm::ConstantInt::get(Builder.getInt8Ty(), Check.first),
llvm::ConstantInt::get(Builder.getInt32Ty(), 0)};
CGF.EmitCheck(Check.second, CheckHandler, StaticArgs, {Src, Dst});
}
static llvm::Value *EmitIsNegativeTestHelper(Value *V, QualType VType,
const char *Name,
CGBuilderTy &Builder) {
bool VSigned = VType->isSignedIntegerOrEnumerationType();
llvm::Type *VTy = V->getType();
if (!VSigned) {
// If the value is unsigned, then it is never negative.
return llvm::ConstantInt::getFalse(VTy->getContext());
}
llvm::Constant *Zero = llvm::ConstantInt::get(VTy, 0);
return Builder.CreateICmp(llvm::ICmpInst::ICMP_SLT, V, Zero,
llvm::Twine(Name) + "." + V->getName() +
".negativitycheck");
}
// Should be called within CodeGenFunction::SanitizerScope RAII scope.
// Returns 'i1 false' when the conversion Src -> Dst changed the sign.
static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
EmitIntegerSignChangeCheckHelper(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, CGBuilderTy &Builder) {
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = Dst->getType();
assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&
"non-integer llvm type");
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
(void)SrcSigned; // Only used in assert()
(void)DstSigned; // Only used in assert()
unsigned SrcBits = SrcTy->getScalarSizeInBits();
unsigned DstBits = DstTy->getScalarSizeInBits();
(void)SrcBits; // Only used in assert()
(void)DstBits; // Only used in assert()
assert(((SrcBits != DstBits) || (SrcSigned != DstSigned)) &&
"either the widths should be different, or the signednesses.");
// 1. Was the old Value negative?
llvm::Value *SrcIsNegative =
EmitIsNegativeTestHelper(Src, SrcType, "src", Builder);
// 2. Is the new Value negative?
llvm::Value *DstIsNegative =
EmitIsNegativeTestHelper(Dst, DstType, "dst", Builder);
// 3. Now, was the 'negativity status' preserved during the conversion?
// NOTE: conversion from negative to zero is considered to change the sign.
// (We want to get 'false' when the conversion changed the sign)
// So we should just equality-compare the negativity statuses.
llvm::Value *Check = nullptr;
Check = Builder.CreateICmpEQ(SrcIsNegative, DstIsNegative, "signchangecheck");
// If the comparison result is 'false', then the conversion changed the sign.
return std::make_pair(
ScalarExprEmitter::ICCK_IntegerSignChange,
std::make_pair(Check, SanitizerKind::SO_ImplicitIntegerSignChange));
}
void ScalarExprEmitter::EmitIntegerSignChangeCheck(Value *Src, QualType SrcType,
Value *Dst, QualType DstType,
SourceLocation Loc,
bool OBTrapInvolved) {
if (!CGF.SanOpts.has(SanitizerKind::SO_ImplicitIntegerSignChange) &&
!OBTrapInvolved)
return;
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = Dst->getType();
// We only care about int->int conversions here.
// We ignore conversions to/from pointer and/or bool.
if (!PromotionIsPotentiallyEligibleForImplicitIntegerConversionCheck(SrcType,
DstType))
return;
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
unsigned SrcBits = SrcTy->getScalarSizeInBits();
unsigned DstBits = DstTy->getScalarSizeInBits();
// Now, we do not need to emit the check in *all* of the cases.
// We can avoid emitting it in some obvious cases where it would have been
// dropped by the opt passes (instcombine) always anyways.
// If it's a cast between effectively the same type, no check.
// NOTE: this is *not* equivalent to checking the canonical types.
if (SrcSigned == DstSigned && SrcBits == DstBits)
return;
// At least one of the values needs to have signed type.
// If both are unsigned, then obviously, neither of them can be negative.
if (!SrcSigned && !DstSigned)
return;
// If the conversion is to *larger* *signed* type, then no check is needed.
// Because either sign-extension happens (so the sign will remain),
// or zero-extension will happen (the sign bit will be zero.)
if ((DstBits > SrcBits) && DstSigned)
return;
if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) &&
(SrcBits > DstBits) && SrcSigned) {
// If the signed integer truncation sanitizer is enabled,
// and this is a truncation from signed type, then no check is needed.
// Because here sign change check is interchangeable with truncation check.
return;
}
// Does an SSCL have an entry for the DstType under its respective sanitizer
// section? Don't check this if an __ob_trap type is involved as it has
// priority to emit checks regardless of sanitizer case lists.
if (!OBTrapInvolved) {
if (DstSigned &&
CGF.getContext().isTypeIgnoredBySanitizer(
SanitizerKind::ImplicitSignedIntegerTruncation, DstType))
return;
if (!DstSigned &&
CGF.getContext().isTypeIgnoredBySanitizer(
SanitizerKind::ImplicitUnsignedIntegerTruncation, DstType))
return;
}
// That's it. We can't rule out any more cases with the data we have.
auto CheckHandler = SanitizerHandler::ImplicitConversion;
SanitizerDebugLocation SanScope(
&CGF,
{SanitizerKind::SO_ImplicitIntegerSignChange,
SanitizerKind::SO_ImplicitUnsignedIntegerTruncation,
SanitizerKind::SO_ImplicitSignedIntegerTruncation},
CheckHandler);
std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
Check;
// Each of these checks needs to return 'false' when an issue was detected.
ImplicitConversionCheckKind CheckKind;
llvm::SmallVector<std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>,
2>
Checks;
// So we can 'and' all the checks together, and still get 'false',
// if at least one of the checks detected an issue.
Check = EmitIntegerSignChangeCheckHelper(Src, SrcType, Dst, DstType, Builder);
CheckKind = Check.first;
Checks.emplace_back(Check.second);
if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) &&
(SrcBits > DstBits) && !SrcSigned && DstSigned) {
// If the signed integer truncation sanitizer was enabled,
// and we are truncating from larger unsigned type to smaller signed type,
// let's handle the case we skipped in that check.
Check =
EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder);
CheckKind = ICCK_SignedIntegerTruncationOrSignChange;
Checks.emplace_back(Check.second);
// If the comparison result is 'i1 false', then the truncation was lossy.
}
if (!CGF.SanOpts.has(SanitizerKind::SO_ImplicitIntegerSignChange)) {
if (OBTrapInvolved) {
llvm::Value *Combined = Check.second.first;
for (const auto &C : Checks)
Combined = Builder.CreateAnd(Combined, C.first);
CGF.EmitTrapCheck(Combined, CheckHandler);
}
return;
}
llvm::Constant *StaticArgs[] = {
CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType),
CGF.EmitCheckTypeDescriptor(DstType),
llvm::ConstantInt::get(Builder.getInt8Ty(), CheckKind),
llvm::ConstantInt::get(Builder.getInt32Ty(), 0)};
// EmitCheck() will 'and' all the checks together.
CGF.EmitCheck(Checks, CheckHandler, StaticArgs, {Src, Dst});
}
// Should be called within CodeGenFunction::SanitizerScope RAII scope.
// Returns 'i1 false' when the truncation Src -> Dst was lossy.
static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
EmitBitfieldTruncationCheckHelper(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, CGBuilderTy &Builder) {
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
ScalarExprEmitter::ImplicitConversionCheckKind Kind;
if (!SrcSigned && !DstSigned)
Kind = ScalarExprEmitter::ICCK_UnsignedIntegerTruncation;
else
Kind = ScalarExprEmitter::ICCK_SignedIntegerTruncation;
llvm::Value *Check = nullptr;
// 1. Extend the truncated value back to the same width as the Src.
Check = Builder.CreateIntCast(Dst, Src->getType(), DstSigned, "bf.anyext");
// 2. Equality-compare with the original source value
Check = Builder.CreateICmpEQ(Check, Src, "bf.truncheck");
// If the comparison result is 'i1 false', then the truncation was lossy.
return std::make_pair(
Kind,
std::make_pair(Check, SanitizerKind::SO_ImplicitBitfieldConversion));
}
// Should be called within CodeGenFunction::SanitizerScope RAII scope.
// Returns 'i1 false' when the conversion Src -> Dst changed the sign.
static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
EmitBitfieldSignChangeCheckHelper(Value *Src, QualType SrcType, Value *Dst,
QualType DstType, CGBuilderTy &Builder) {
// 1. Was the old Value negative?
llvm::Value *SrcIsNegative =
EmitIsNegativeTestHelper(Src, SrcType, "bf.src", Builder);
// 2. Is the new Value negative?
llvm::Value *DstIsNegative =
EmitIsNegativeTestHelper(Dst, DstType, "bf.dst", Builder);
// 3. Now, was the 'negativity status' preserved during the conversion?
// NOTE: conversion from negative to zero is considered to change the sign.
// (We want to get 'false' when the conversion changed the sign)
// So we should just equality-compare the negativity statuses.
llvm::Value *Check = nullptr;
Check =
Builder.CreateICmpEQ(SrcIsNegative, DstIsNegative, "bf.signchangecheck");
// If the comparison result is 'false', then the conversion changed the sign.
return std::make_pair(
ScalarExprEmitter::ICCK_IntegerSignChange,
std::make_pair(Check, SanitizerKind::SO_ImplicitBitfieldConversion));
}
void CodeGenFunction::EmitBitfieldConversionCheck(Value *Src, QualType SrcType,
Value *Dst, QualType DstType,
const CGBitFieldInfo &Info,
SourceLocation Loc) {
if (!SanOpts.has(SanitizerKind::ImplicitBitfieldConversion))
return;
// We only care about int->int conversions here.
// We ignore conversions to/from pointer and/or bool.
if (!PromotionIsPotentiallyEligibleForImplicitIntegerConversionCheck(SrcType,
DstType))
return;
if (DstType->isBooleanType() || SrcType->isBooleanType())
return;
// This should be truncation of integral types.
assert(isa<llvm::IntegerType>(Src->getType()) &&
isa<llvm::IntegerType>(Dst->getType()) && "non-integer llvm type");
// TODO: Calculate src width to avoid emitting code
// for unecessary cases.
unsigned SrcBits = ConvertType(SrcType)->getScalarSizeInBits();
unsigned DstBits = Info.Size;
bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType();
bool DstSigned = DstType->isSignedIntegerOrEnumerationType();
auto CheckHandler = SanitizerHandler::ImplicitConversion;
SanitizerDebugLocation SanScope(
this, {SanitizerKind::SO_ImplicitBitfieldConversion}, CheckHandler);
std::pair<ScalarExprEmitter::ImplicitConversionCheckKind,
std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>>
Check;
// Truncation
bool EmitTruncation = DstBits < SrcBits;
// If Dst is signed and Src unsigned, we want to be more specific
// about the CheckKind we emit, in this case we want to emit
// ICCK_SignedIntegerTruncationOrSignChange.
bool EmitTruncationFromUnsignedToSigned =
EmitTruncation && DstSigned && !SrcSigned;
// Sign change
bool SameTypeSameSize = SrcSigned == DstSigned && SrcBits == DstBits;
bool BothUnsigned = !SrcSigned && !DstSigned;
bool LargerSigned = (DstBits > SrcBits) && DstSigned;
// We can avoid emitting sign change checks in some obvious cases
// 1. If Src and Dst have the same signedness and size
// 2. If both are unsigned sign check is unecessary!
// 3. If Dst is signed and bigger than Src, either
// sign-extension or zero-extension will make sure
// the sign remains.
bool EmitSignChange = !SameTypeSameSize && !BothUnsigned && !LargerSigned;
if (EmitTruncation)
Check =
EmitBitfieldTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder);
else if (EmitSignChange) {
assert(((SrcBits != DstBits) || (SrcSigned != DstSigned)) &&
"either the widths should be different, or the signednesses.");
Check =
EmitBitfieldSignChangeCheckHelper(Src, SrcType, Dst, DstType, Builder);
} else
return;
ScalarExprEmitter::ImplicitConversionCheckKind CheckKind = Check.first;
if (EmitTruncationFromUnsignedToSigned)
CheckKind = ScalarExprEmitter::ICCK_SignedIntegerTruncationOrSignChange;
llvm::Constant *StaticArgs[] = {
EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(SrcType),
EmitCheckTypeDescriptor(DstType),
llvm::ConstantInt::get(Builder.getInt8Ty(), CheckKind),
llvm::ConstantInt::get(Builder.getInt32Ty(), Info.Size)};
EmitCheck(Check.second, CheckHandler, StaticArgs, {Src, Dst});
}
Value *ScalarExprEmitter::EmitScalarCast(Value *Src, QualType SrcType,
QualType DstType, llvm::Type *SrcTy,
llvm::Type *DstTy,
ScalarConversionOpts Opts) {
// The Element types determine the type of cast to perform.
llvm::Type *SrcElementTy;
llvm::Type *DstElementTy;
QualType SrcElementType;
QualType DstElementType;
if (SrcType->isMatrixType() && DstType->isMatrixType()) {
SrcElementTy = cast<llvm::VectorType>(SrcTy)->getElementType();
DstElementTy = cast<llvm::VectorType>(DstTy)->getElementType();
SrcElementType = SrcType->castAs<MatrixType>()->getElementType();
DstElementType = DstType->castAs<MatrixType>()->getElementType();
} else {
assert(!SrcType->isMatrixType() && !DstType->isMatrixType() &&
"cannot cast between matrix and non-matrix types");
SrcElementTy = SrcTy;
DstElementTy = DstTy;
SrcElementType = SrcType;
DstElementType = DstType;
}
if (isa<llvm::IntegerType>(SrcElementTy)) {
bool InputSigned = SrcElementType->isSignedIntegerOrEnumerationType();
if (SrcElementType->isBooleanType() && Opts.TreatBooleanAsSigned) {
InputSigned = true;
}
if (isa<llvm::IntegerType>(DstElementTy))
return Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
if (InputSigned)
return Builder.CreateSIToFP(Src, DstTy, "conv");
return Builder.CreateUIToFP(Src, DstTy, "conv");
}
if (isa<llvm::IntegerType>(DstElementTy)) {
assert(SrcElementTy->isFloatingPointTy() && "Unknown real conversion");
bool IsSigned = DstElementType->isSignedIntegerOrEnumerationType();
// If we can't recognize overflow as undefined behavior, assume that
// overflow saturates. This protects against normal optimizations if we are
// compiling with non-standard FP semantics.
if (!CGF.CGM.getCodeGenOpts().StrictFloatCastOverflow) {
llvm::Intrinsic::ID IID =
IsSigned ? llvm::Intrinsic::fptosi_sat : llvm::Intrinsic::fptoui_sat;
return Builder.CreateCall(CGF.CGM.getIntrinsic(IID, {DstTy, SrcTy}), Src);
}
if (IsSigned)
return Builder.CreateFPToSI(Src, DstTy, "conv");
return Builder.CreateFPToUI(Src, DstTy, "conv");
}
if ((DstElementTy->is16bitFPTy() && SrcElementTy->is16bitFPTy())) {
Value *FloatVal = Builder.CreateFPExt(Src, Builder.getFloatTy(), "fpext");
return Builder.CreateFPTrunc(FloatVal, DstTy, "fptrunc");
}
if (DstElementTy->getTypeID() < SrcElementTy->getTypeID())
return Builder.CreateFPTrunc(Src, DstTy, "conv");
return Builder.CreateFPExt(Src, DstTy, "conv");
}
/// Emit a conversion from the specified type to the specified destination type,
/// both of which are LLVM scalar types.
Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
QualType DstType,
SourceLocation Loc,
ScalarConversionOpts Opts) {
// All conversions involving fixed point types should be handled by the
// EmitFixedPoint family functions. This is done to prevent bloating up this
// function more, and although fixed point numbers are represented by
// integers, we do not want to follow any logic that assumes they should be
// treated as integers.
// TODO(leonardchan): When necessary, add another if statement checking for
// conversions to fixed point types from other types.
if (SrcType->isFixedPointType()) {
if (DstType->isBooleanType())
// It is important that we check this before checking if the dest type is
// an integer because booleans are technically integer types.
// We do not need to check the padding bit on unsigned types if unsigned
// padding is enabled because overflow into this bit is undefined
// behavior.
return Builder.CreateIsNotNull(Src, "tobool");
if (DstType->isFixedPointType() || DstType->isIntegerType() ||
DstType->isRealFloatingType())
return EmitFixedPointConversion(Src, SrcType, DstType, Loc);
llvm_unreachable(
"Unhandled scalar conversion from a fixed point type to another type.");
} else if (DstType->isFixedPointType()) {
if (SrcType->isIntegerType() || SrcType->isRealFloatingType())
// This also includes converting booleans and enums to fixed point types.
return EmitFixedPointConversion(Src, SrcType, DstType, Loc);
llvm_unreachable(
"Unhandled scalar conversion to a fixed point type from another type.");
}
QualType NoncanonicalSrcType = SrcType;
QualType NoncanonicalDstType = DstType;
SrcType = CGF.getContext().getCanonicalType(SrcType);
DstType = CGF.getContext().getCanonicalType(DstType);
if (SrcType == DstType) return Src;
if (DstType->isVoidType()) return nullptr;
llvm::Value *OrigSrc = Src;
QualType OrigSrcType = SrcType;
llvm::Type *SrcTy = Src->getType();
// Handle conversions to bool first, they are special: comparisons against 0.
if (DstType->isBooleanType())
return EmitConversionToBool(Src, SrcType);
llvm::Type *DstTy = ConvertType(DstType);
// Determine whether an overflow behavior of 'trap' has been specified for
// either the destination or the source types. If so, we can elide sanitizer
// capability checks as this overflow behavior kind is also capable of
// emitting traps without runtime sanitizer support.
// Also skip instrumentation if either source or destination has 'wrap'
// behavior - the user has explicitly indicated they accept wrapping
// semantics. Use non-canonical types to preserve OBT annotations.
const auto *DstOBT = NoncanonicalDstType->getAs<OverflowBehaviorType>();
const auto *SrcOBT = NoncanonicalSrcType->getAs<OverflowBehaviorType>();
bool OBTrapInvolved =
(DstOBT && DstOBT->isTrapKind()) || (SrcOBT && SrcOBT->isTrapKind());
bool OBWrapInvolved =
(DstOBT && DstOBT->isWrapKind()) || (SrcOBT && SrcOBT->isWrapKind());
// If half isn't a native type, cast to float for evaluation.
if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType &&
SrcTy == CGF.CGM.HalfTy && DstTy != CGF.CGM.HalfTy) {
if (DstTy->isFloatingPointTy())
return Builder.CreateFPExt(Src, DstTy, "conv");
// Cast to other types through float (as opposed to operations on half,
// available with NativeHalfType).
Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv");
SrcType = CGF.getContext().FloatTy;
SrcTy = CGF.FloatTy;
}
// Ignore conversions like int -> uint.
if (SrcTy == DstTy) {
if (Opts.EmitImplicitIntegerSignChangeChecks ||
(OBTrapInvolved && !OBWrapInvolved))
EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Src,
NoncanonicalDstType, Loc, OBTrapInvolved);
return Src;
}
// Handle pointer conversions next: pointers can only be converted to/from
// other pointers and integers. Check for pointer types in terms of LLVM, as
// some native types (like Obj-C id) may map to a pointer type.
if (auto DstPT = dyn_cast<llvm::PointerType>(DstTy)) {
// The source value may be an integer, or a pointer.
if (isa<llvm::PointerType>(SrcTy))
return Src;
assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
// First, convert to the correct width so that we control the kind of
// extension.
llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DstPT);
bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
llvm::Value* IntResult =
Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
// Then, cast to pointer.
return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
}
if (isa<llvm::PointerType>(SrcTy)) {
// Must be an ptr to int cast.
assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
return Builder.CreatePtrToInt(Src, DstTy, "conv");
}
// A scalar can be splatted to an extended vector of the same element type
if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
// Sema should add casts to make sure that the source expression's type is
// the same as the vector's element type (sans qualifiers)
assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==
SrcType.getTypePtr() &&
"Splatted expr doesn't match with vector element type?");
// Splat the element across to all elements
unsigned NumElements = cast<llvm::FixedVectorType>(DstTy)->getNumElements();
return Builder.CreateVectorSplat(NumElements, Src, "splat");
}
if (SrcType->isMatrixType() && DstType->isMatrixType())
return EmitScalarCast(Src, SrcType, DstType, SrcTy, DstTy, Opts);
if (isa<llvm::VectorType>(SrcTy) || isa<llvm::VectorType>(DstTy)) {
// Allow bitcast from vector to integer/fp of the same size.
llvm::TypeSize SrcSize = SrcTy->getPrimitiveSizeInBits();
llvm::TypeSize DstSize = DstTy->getPrimitiveSizeInBits();
if (SrcSize == DstSize)
return Builder.CreateBitCast(Src, DstTy, "conv");
// Conversions between vectors of different sizes are not allowed except
// when vectors of half are involved. Operations on storage-only half
// vectors require promoting half vector operands to float vectors and
// truncating the result, which is either an int or float vector, to a
// short or half vector.
// Source and destination are both expected to be vectors.
llvm::Type *SrcElementTy = cast<llvm::VectorType>(SrcTy)->getElementType();
llvm::Type *DstElementTy = cast<llvm::VectorType>(DstTy)->getElementType();
(void)DstElementTy;
assert(((SrcElementTy->isIntegerTy() &&
DstElementTy->isIntegerTy()) ||
(SrcElementTy->isFloatingPointTy() &&
DstElementTy->isFloatingPointTy())) &&
"unexpected conversion between a floating-point vector and an "
"integer vector");
// Truncate an i32 vector to an i16 vector.
if (SrcElementTy->isIntegerTy())
return Builder.CreateIntCast(Src, DstTy, false, "conv");
// Truncate a float vector to a half vector.
if (SrcSize > DstSize)
return Builder.CreateFPTrunc(Src, DstTy, "conv");
// Promote a half vector to a float vector.
return Builder.CreateFPExt(Src, DstTy, "conv");
}
// Finally, we have the arithmetic types: real int/float.
Value *Res = nullptr;
llvm::Type *ResTy = DstTy;
// An overflowing conversion has undefined behavior if either the source type
// or the destination type is a floating-point type. However, we consider the
// range of representable values for all floating-point types to be
// [-inf,+inf], so no overflow can ever happen when the destination type is a
// floating-point type.
if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) &&
OrigSrcType->isFloatingType())
EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy,
Loc);
// Cast to half from float if half isn't a native type. When __fp16 isn't
// native, arithmetic is evaluated as float.
if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType &&
DstTy == CGF.CGM.HalfTy) {
// Make sure we cast in a single step if from another FP type.
if (SrcTy->isFloatingPointTy())
return Builder.CreateFPTrunc(Src, CGF.CGM.HalfTy, "conv");
DstTy = CGF.FloatTy;
}
Res = EmitScalarCast(Src, SrcType, DstType, SrcTy, DstTy, Opts);
if (DstTy != ResTy) {
Res = Builder.CreateFPTrunc(Res, CGF.CGM.HalfTy, "conv");
if (ResTy != CGF.CGM.HalfTy) {
assert(ResTy->isIntegerTy(16) &&
"Only half FP requires extra conversion");
Res = Builder.CreateBitCast(Res, ResTy);
}
}
if ((Opts.EmitImplicitIntegerTruncationChecks || OBTrapInvolved) &&
!OBWrapInvolved && !Opts.PatternExcluded)
EmitIntegerTruncationCheck(Src, NoncanonicalSrcType, Res,
NoncanonicalDstType, Loc, OBTrapInvolved);
if (Opts.EmitImplicitIntegerSignChangeChecks ||
(OBTrapInvolved && !OBWrapInvolved))
EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Res,
NoncanonicalDstType, Loc, OBTrapInvolved);
return Res;
}
Value *ScalarExprEmitter::EmitFixedPointConversion(Value *Src, QualType SrcTy,
QualType DstTy,
SourceLocation Loc) {
llvm::FixedPointBuilder<CGBuilderTy> FPBuilder(Builder);
llvm::Value *Result;
if (SrcTy->isRealFloatingType())
Result = FPBuilder.CreateFloatingToFixed(Src,
CGF.getContext().getFixedPointSemantics(DstTy));
else if (DstTy->isRealFloatingType())
Result = FPBuilder.CreateFixedToFloating(Src,
CGF.getContext().getFixedPointSemantics(SrcTy),
ConvertType(DstTy));
else {
auto SrcFPSema = CGF.getContext().getFixedPointSemantics(SrcTy);
auto DstFPSema = CGF.getContext().getFixedPointSemantics(DstTy);
if (DstTy->isIntegerType())
Result = FPBuilder.CreateFixedToInteger(Src, SrcFPSema,
DstFPSema.getWidth(),
DstFPSema.isSigned());
else if (SrcTy->isIntegerType())
Result = FPBuilder.CreateIntegerToFixed(Src, SrcFPSema.isSigned(),
DstFPSema);
else
Result = FPBuilder.CreateFixedToFixed(Src, SrcFPSema, DstFPSema);
}
return Result;
}
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *ScalarExprEmitter::EmitComplexToScalarConversion(
CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy,
SourceLocation Loc) {
// Get the source element type.
SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
// Handle conversions to bool first, they are special: comparisons against 0.
if (DstTy->isBooleanType()) {
// Complex != 0 -> (Real != 0) | (Imag != 0)
Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc);
return Builder.CreateOr(Src.first, Src.second, "tobool");
}
// C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
// the imaginary part of the complex value is discarded and the value of the
// real part is converted according to the conversion rules for the
// corresponding real type.
return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc);
}
Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
}
/// Emit a sanitization check for the given "binary" operation (which
/// might actually be a unary increment which has been lowered to a binary
/// operation). The check passes if all values in \p Checks (which are \c i1),
/// are \c true.
void ScalarExprEmitter::EmitBinOpCheck(
ArrayRef<std::pair<Value *, SanitizerKind::SanitizerOrdinal>> Checks,
const BinOpInfo &Info) {
assert(CGF.IsSanitizerScope);
SanitizerHandler Check;
SmallVector<llvm::Constant *, 4> StaticData;
SmallVector<llvm::Value *, 2> DynamicData;
TrapReason TR;
BinaryOperatorKind Opcode = Info.Opcode;
if (BinaryOperator::isCompoundAssignmentOp(Opcode))
Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
if (UO && UO->getOpcode() == UO_Minus) {
Check = SanitizerHandler::NegateOverflow;
StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
DynamicData.push_back(Info.RHS);
} else {
if (BinaryOperator::isShiftOp(Opcode)) {
// Shift LHS negative or too large, or RHS out of bounds.
Check = SanitizerHandler::ShiftOutOfBounds;
const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
StaticData.push_back(
CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
StaticData.push_back(
CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
} else if (Opcode == BO_Div || Opcode == BO_Rem) {
// Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
Check = SanitizerHandler::DivremOverflow;
StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
} else {
// Arithmetic overflow (+, -, *).
int ArithOverflowKind = 0;
switch (Opcode) {
case BO_Add: {
Check = SanitizerHandler::AddOverflow;
ArithOverflowKind = diag::UBSanArithKind::Add;
break;
}
case BO_Sub: {
Check = SanitizerHandler::SubOverflow;
ArithOverflowKind = diag::UBSanArithKind::Sub;
break;
}
case BO_Mul: {
Check = SanitizerHandler::MulOverflow;
ArithOverflowKind = diag::UBSanArithKind::Mul;
break;
}
default:
llvm_unreachable("unexpected opcode for bin op check");
}
StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
if (CGF.CGM.getCodeGenOpts().SanitizeTrap.has(
SanitizerKind::UnsignedIntegerOverflow) ||
CGF.CGM.getCodeGenOpts().SanitizeTrap.has(
SanitizerKind::SignedIntegerOverflow)) {
// Only pay the cost for constructing the trap diagnostic if they are
// going to be used.
CGF.CGM.BuildTrapReason(diag::trap_ubsan_arith_overflow, TR)
<< Info.Ty->isSignedIntegerOrEnumerationType() << ArithOverflowKind
<< Info.E;
}
}
DynamicData.push_back(Info.LHS);
DynamicData.push_back(Info.RHS);
}
CGF.EmitCheck(Checks, Check, StaticData, DynamicData, &TR);
}
//===----------------------------------------------------------------------===//
// Visitor Methods
//===----------------------------------------------------------------------===//
Value *ScalarExprEmitter::VisitExpr(Expr *E) {
CGF.ErrorUnsupported(E, "scalar expression");
if (E->getType()->isVoidType())
return nullptr;
return llvm::PoisonValue::get(CGF.ConvertType(E->getType()));
}
Value *
ScalarExprEmitter::VisitSYCLUniqueStableNameExpr(SYCLUniqueStableNameExpr *E) {
ASTContext &Context = CGF.getContext();
unsigned AddrSpace =
Context.getTargetAddressSpace(CGF.CGM.GetGlobalConstantAddressSpace());
llvm::Constant *GlobalConstStr = Builder.CreateGlobalString(
E->ComputeName(Context), "__usn_str", AddrSpace);
llvm::Type *ExprTy = ConvertType(E->getType());
return Builder.CreatePointerBitCastOrAddrSpaceCast(GlobalConstStr, ExprTy,
"usn_addr_cast");
}
Value *ScalarExprEmitter::VisitEmbedExpr(EmbedExpr *E) {
assert(E->getDataElementCount() == 1);
auto It = E->begin();
return Builder.getInt((*It)->getValue());
}
Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
// Vector Mask Case
if (E->getNumSubExprs() == 2) {
Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
Value *Mask;
auto *LTy = cast<llvm::FixedVectorType>(LHS->getType());
unsigned LHSElts = LTy->getNumElements();
Mask = RHS;
auto *MTy = cast<llvm::FixedVectorType>(Mask->getType());
// Mask off the high bits of each shuffle index.
Value *MaskBits =
llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1);
Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
// newv = undef
// mask = mask & maskbits
// for each elt
// n = extract mask i
// x = extract val n
// newv = insert newv, x, i
auto *RTy = llvm::FixedVectorType::get(LTy->getElementType(),
MTy->getNumElements());
Value* NewV = llvm::PoisonValue::get(RTy);
for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i);
Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
}
return NewV;
}
Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
SmallVector<int, 32> Indices;
for (unsigned i = 2; i < E->getNumSubExprs(); ++i) {
llvm::APSInt Idx = E->getShuffleMaskIdx(i - 2);
// Check for -1 and output it as undef in the IR.
if (Idx.isSigned() && Idx.isAllOnes())
Indices.push_back(-1);
else
Indices.push_back(Idx.getZExtValue());
}
return Builder.CreateShuffleVector(V1, V2, Indices, "shuffle");
}
Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) {
QualType SrcType = E->getSrcExpr()->getType(),
DstType = E->getType();
Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
SrcType = CGF.getContext().getCanonicalType(SrcType);
DstType = CGF.getContext().getCanonicalType(DstType);
if (SrcType == DstType) return Src;
assert(SrcType->isVectorType() &&
"ConvertVector source type must be a vector");
assert(DstType->isVectorType() &&
"ConvertVector destination type must be a vector");
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = ConvertType(DstType);
// Ignore conversions like int -> uint.
if (SrcTy == DstTy)
return Src;
QualType SrcEltType = SrcType->castAs<VectorType>()->getElementType(),
DstEltType = DstType->castAs<VectorType>()->getElementType();
assert(SrcTy->isVectorTy() &&
"ConvertVector source IR type must be a vector");
assert(DstTy->isVectorTy() &&
"ConvertVector destination IR type must be a vector");
llvm::Type *SrcEltTy = cast<llvm::VectorType>(SrcTy)->getElementType(),
*DstEltTy = cast<llvm::VectorType>(DstTy)->getElementType();
if (DstEltType->isBooleanType()) {
assert((SrcEltTy->isFloatingPointTy() ||
isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion");
llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy);
if (SrcEltTy->isFloatingPointTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptions(CGF, E);
return Builder.CreateFCmpUNE(Src, Zero, "tobool");
} else {
return Builder.CreateICmpNE(Src, Zero, "tobool");
}
}
// We have the arithmetic types: real int/float.
Value *Res = nullptr;
if (isa<llvm::IntegerType>(SrcEltTy)) {
bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType();
if (isa<llvm::IntegerType>(DstEltTy))
Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
else {
CodeGenFunction::CGFPOptionsRAII FPOptions(CGF, E);
if (InputSigned)
Res = Builder.CreateSIToFP(Src, DstTy, "conv");
else
Res = Builder.CreateUIToFP(Src, DstTy, "conv");
}
} else if (isa<llvm::IntegerType>(DstEltTy)) {
assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion");
CodeGenFunction::CGFPOptionsRAII FPOptions(CGF, E);
if (DstEltType->isSignedIntegerOrEnumerationType())
Res = Builder.CreateFPToSI(Src, DstTy, "conv");
else
Res = Builder.CreateFPToUI(Src, DstTy, "conv");
} else {
assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&
"Unknown real conversion");
CodeGenFunction::CGFPOptionsRAII FPOptions(CGF, E);
if (DstEltTy->getTypeID() < SrcEltTy->getTypeID())
Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
else
Res = Builder.CreateFPExt(Src, DstTy, "conv");
}
return Res;
}
Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E)) {
CGF.EmitIgnoredExpr(E->getBase());
return CGF.emitScalarConstant(Constant, E);
} else {
Expr::EvalResult Result;
if (E->EvaluateAsInt(Result, CGF.getContext(), Expr::SE_AllowSideEffects)) {
llvm::APSInt Value = Result.Val.getInt();
CGF.EmitIgnoredExpr(E->getBase());
return Builder.getInt(Value);
}
}
llvm::Value *Result = EmitLoadOfLValue(E);
// If -fdebug-info-for-profiling is specified, emit a pseudo variable and its
// debug info for the pointer, even if there is no variable associated with
// the pointer's expression.
if (CGF.CGM.getCodeGenOpts().DebugInfoForProfiling && CGF.getDebugInfo()) {
if (llvm::LoadInst *Load = dyn_cast<llvm::LoadInst>(Result)) {
if (llvm::GetElementPtrInst *GEP =
dyn_cast<llvm::GetElementPtrInst>(Load->getPointerOperand())) {
if (llvm::Instruction *Pointer =
dyn_cast<llvm::Instruction>(GEP->getPointerOperand())) {
QualType Ty = E->getBase()->getType();
if (!E->isArrow())
Ty = CGF.getContext().getPointerType(Ty);
CGF.getDebugInfo()->EmitPseudoVariable(Builder, Pointer, Ty);
}
}
}
}
return Result;
}
Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
TestAndClearIgnoreResultAssign();
// Emit subscript expressions in rvalue context's. For most cases, this just
// loads the lvalue formed by the subscript expr. However, we have to be
// careful, because the base of a vector subscript is occasionally an rvalue,
// so we can't get it as an lvalue.
if (!E->getBase()->getType()->isVectorType() &&
!E->getBase()->getType()->isSveVLSBuiltinType())
return EmitLoadOfLValue(E);
// Handle the vector case. The base must be a vector, the index must be an
// integer value.
Value *Base = Visit(E->getBase());
Value *Idx = Visit(E->getIdx());
QualType IdxTy = E->getIdx()->getType();
if (CGF.SanOpts.has(SanitizerKind::ArrayBounds))
CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
Value *Ret = Builder.CreateExtractElement(Base, Idx, "vecext");
// Even being a scalar the `__mfp8` type corresponds to `<1 x i8>` in LLVM IR.
if (E->getType()->isMFloat8Type())
Ret = Builder.CreateInsertElement(
llvm::PoisonValue::get(llvm::FixedVectorType::get(CGF.Int8Ty, 1)), Ret,
uint64_t(0), "mfp8ext");
return Ret;
}
Value *ScalarExprEmitter::VisitMatrixSingleSubscriptExpr(
MatrixSingleSubscriptExpr *E) {
TestAndClearIgnoreResultAssign();
auto *MatrixTy = E->getBase()->getType()->castAs<ConstantMatrixType>();
unsigned NumRows = MatrixTy->getNumRows();
unsigned NumColumns = MatrixTy->getNumColumns();
// Row index
Value *RowIdx = CGF.EmitMatrixIndexExpr(E->getRowIdx());
llvm::MatrixBuilder MB(Builder);
// The row index must be in [0, NumRows)
if (CGF.CGM.getCodeGenOpts().OptimizationLevel > 0)
MB.CreateIndexAssumption(RowIdx, NumRows);
Value *FlatMatrix = Visit(E->getBase());
llvm::Type *ElemTy = CGF.ConvertType(MatrixTy->getElementType());
auto *ResultTy = llvm::FixedVectorType::get(ElemTy, NumColumns);
Value *RowVec = llvm::PoisonValue::get(ResultTy);
for (unsigned Col = 0; Col != NumColumns; ++Col) {
Value *ColVal = llvm::ConstantInt::get(RowIdx->getType(), Col);
Value *EltIdx = MB.CreateIndex(RowIdx, ColVal, NumRows, NumColumns,
/*IsRowMajor=*/false, "matrix_row_idx");
Value *Elt =
Builder.CreateExtractElement(FlatMatrix, EltIdx, "matrix_elem");
Value *Lane = llvm::ConstantInt::get(Builder.getInt32Ty(), Col);
RowVec = Builder.CreateInsertElement(RowVec, Elt, Lane, "matrix_row_ins");
}
return RowVec;
}
Value *ScalarExprEmitter::VisitMatrixSubscriptExpr(MatrixSubscriptExpr *E) {
TestAndClearIgnoreResultAssign();
// HLSL matrix loads are normalized to column-major register values, but
// non-HLSL matrix values retain the selected memory layout.
Value *RowIdx = CGF.EmitMatrixIndexExpr(E->getRowIdx());
Value *ColumnIdx = CGF.EmitMatrixIndexExpr(E->getColumnIdx());
const auto *MatrixTy = E->getBase()->getType()->castAs<ConstantMatrixType>();
llvm::MatrixBuilder MB(Builder);
unsigned NumCols = MatrixTy->getNumColumns();
unsigned NumRows = MatrixTy->getNumRows();
bool IsMatrixRowMajor =
!CGF.getLangOpts().HLSL &&
isMatrixRowMajor(CGF.getLangOpts(), E->getBase()->getType());
Value *Idx =
MB.CreateIndex(RowIdx, ColumnIdx, NumRows, NumCols, IsMatrixRowMajor);
if (CGF.CGM.getCodeGenOpts().OptimizationLevel > 0)
MB.CreateIndexAssumption(Idx, MatrixTy->getNumElementsFlattened());
Value *Matrix = Visit(E->getBase());
// TODO: Should we emit bounds checks with SanitizerKind::ArrayBounds?
return Builder.CreateExtractElement(Matrix, Idx, "matrixext");
}
static int getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
unsigned Off) {
int MV = SVI->getMaskValue(Idx);
if (MV == -1)
return -1;
return Off + MV;
}
static int getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) {
assert(llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) &&
"Index operand too large for shufflevector mask!");
return C->getZExtValue();
}
Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
bool Ignore = TestAndClearIgnoreResultAssign();
(void)Ignore;
unsigned NumInitElements = E->getNumInits();
assert((Ignore == false ||
(NumInitElements == 0 && E->getType()->isVoidType())) &&
"init list ignored");
// HLSL initialization lists in the AST are an expansion which can contain
// side-effecting expressions wrapped in opaque value expressions. To properly
// emit these we need to emit the opaque values before we emit the argument
// expressions themselves. This is a little hacky, but it prevents us needing
// to do a bigger AST-level change for a language feature that we need
// deprecate in the near future. See related HLSL language proposals in the
// proposals (https://github.com/microsoft/hlsl-specs/blob/main/proposals):
// * 0005-strict-initializer-lists.md
// * 0032-constructors.md
if (CGF.getLangOpts().HLSL)
CGF.CGM.getHLSLRuntime().emitInitListOpaqueValues(CGF, E);
if (E->hadArrayRangeDesignator())
CGF.ErrorUnsupported(E, "GNU array range designator extension");
llvm::VectorType *VType =
dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
if (!VType) {
if (NumInitElements == 0) {
// C++11 value-initialization for the scalar.
return EmitNullValue(E->getType());
}
// We have a scalar in braces. Just use the first element.
return Visit(E->getInit(0));
}
if (isa<llvm::ScalableVectorType>(VType)) {
if (NumInitElements == 0) {
// C++11 value-initialization for the vector.
return EmitNullValue(E->getType());
}
if (NumInitElements == 1) {
Expr *InitVector = E->getInit(0);
// Initialize from another scalable vector of the same type.
if (InitVector->getType().getCanonicalType() ==
E->getType().getCanonicalType())
return Visit(InitVector);
}
llvm_unreachable("Unexpected initialization of a scalable vector!");
}
unsigned ResElts = cast<llvm::FixedVectorType>(VType)->getNumElements();
// For column-major matrix types, we insert elements directly at their
// column-major positions rather than inserting sequentially and shuffling.
const ConstantMatrixType *ColMajorMT =
E->getType()->getAs<ConstantMatrixType>();
// Loop over initializers collecting the Value for each, and remembering
// whether the source was swizzle (ExtVectorElementExpr). This will allow
// us to fold the shuffle for the swizzle into the shuffle for the vector
// initializer, since LLVM optimizers generally do not want to touch
// shuffles.
unsigned CurIdx = 0;
bool VIsPoisonShuffle = false;
llvm::Value *V = llvm::PoisonValue::get(VType);
for (unsigned i = 0; i != NumInitElements; ++i) {
Expr *IE = E->getInit(i);
Value *Init = Visit(IE);
SmallVector<int, 16> Args;
llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
// Handle scalar elements. If the scalar initializer is actually one
// element of a different vector of the same width, use shuffle instead of
// extract+insert.
if (!VVT) {
if (isa<ExtVectorElementExpr>(IE)) {
llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
if (cast<llvm::FixedVectorType>(EI->getVectorOperandType())
->getNumElements() == ResElts) {
llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
Value *LHS = nullptr, *RHS = nullptr;
if (CurIdx == 0) {
// insert into poison -> shuffle (src, poison)
// shufflemask must use an i32
Args.push_back(getAsInt32(C, CGF.Int32Ty));
Args.resize(ResElts, -1);
LHS = EI->getVectorOperand();
RHS = V;
VIsPoisonShuffle = true;
} else if (VIsPoisonShuffle) {
// insert into poison shuffle && size match -> shuffle (v, src)
llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
for (unsigned j = 0; j != CurIdx; ++j)
Args.push_back(getMaskElt(SVV, j, 0));
Args.push_back(ResElts + C->getZExtValue());
Args.resize(ResElts, -1);
LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
RHS = EI->getVectorOperand();
VIsPoisonShuffle = false;
}
if (!Args.empty()) {
V = Builder.CreateShuffleVector(LHS, RHS, Args);
++CurIdx;
continue;
}
}
}
unsigned InsertIdx =
ColMajorMT
? ColMajorMT->mapRowMajorToColumnMajorFlattenedIndex(CurIdx)
: CurIdx;
V = Builder.CreateInsertElement(V, Init, Builder.getInt32(InsertIdx),
"vecinit");
VIsPoisonShuffle = false;
++CurIdx;
continue;
}
unsigned InitElts = cast<llvm::FixedVectorType>(VVT)->getNumElements();
// If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
// input is the same width as the vector being constructed, generate an
// optimized shuffle of the swizzle input into the result.
unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
if (isa<ExtVectorElementExpr>(IE)) {
llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
Value *SVOp = SVI->getOperand(0);
auto *OpTy = cast<llvm::FixedVectorType>(SVOp->getType());
if (OpTy->getNumElements() == ResElts) {
for (unsigned j = 0; j != CurIdx; ++j) {
// If the current vector initializer is a shuffle with poison, merge
// this shuffle directly into it.
if (VIsPoisonShuffle) {
Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0));
} else {
Args.push_back(j);
}
}
for (unsigned j = 0, je = InitElts; j != je; ++j)
Args.push_back(getMaskElt(SVI, j, Offset));
Args.resize(ResElts, -1);
if (VIsPoisonShuffle)
V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
Init = SVOp;
}
}
// Extend init to result vector length, and then shuffle its contribution
// to the vector initializer into V.
if (Args.empty()) {
for (unsigned j = 0; j != InitElts; ++j)
Args.push_back(j);
Args.resize(ResElts, -1);
Init = Builder.CreateShuffleVector(Init, Args, "vext");
Args.clear();
for (unsigned j = 0; j != CurIdx; ++j)
Args.push_back(j);
for (unsigned j = 0; j != InitElts; ++j)
Args.push_back(j + Offset);
Args.resize(ResElts, -1);
}
// If V is poison, make sure it ends up on the RHS of the shuffle to aid
// merging subsequent shuffles into this one.
if (CurIdx == 0)
std::swap(V, Init);
V = Builder.CreateShuffleVector(V, Init, Args, "vecinit");
VIsPoisonShuffle = isa<llvm::PoisonValue>(Init);
CurIdx += InitElts;
}
// FIXME: evaluate codegen vs. shuffling against constant null vector.
// Emit remaining default initializers.
llvm::Type *EltTy = VType->getElementType();
// Emit remaining default initializers
for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
unsigned InsertIdx =
ColMajorMT ? ColMajorMT->mapRowMajorToColumnMajorFlattenedIndex(CurIdx)
: CurIdx;
Value *Idx = Builder.getInt32(InsertIdx);
llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
}
return V;
}
static bool isDeclRefKnownNonNull(CodeGenFunction &CGF, const ValueDecl *D) {
return !D->isWeak();
}
static bool isLValueKnownNonNull(CodeGenFunction &CGF, const Expr *E) {
E = E->IgnoreParens();
if (const auto *UO = dyn_cast<UnaryOperator>(E))
if (UO->getOpcode() == UO_Deref)
return CGF.isPointerKnownNonNull(UO->getSubExpr());
if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
return isDeclRefKnownNonNull(CGF, DRE->getDecl());
if (const auto *ME = dyn_cast<MemberExpr>(E)) {
if (isa<FieldDecl>(ME->getMemberDecl()))
return true;
return isDeclRefKnownNonNull(CGF, ME->getMemberDecl());
}
// Array subscripts? Anything else?
return false;
}
bool CodeGenFunction::isPointerKnownNonNull(const Expr *E) {
assert(E->getType()->isSignableType(getContext()));
E = E->IgnoreParens();
if (isa<CXXThisExpr>(E))
return true;
if (const auto *UO = dyn_cast<UnaryOperator>(E))
if (UO->getOpcode() == UO_AddrOf)
return isLValueKnownNonNull(*this, UO->getSubExpr());
if (const auto *CE = dyn_cast<CastExpr>(E))
if (CE->getCastKind() == CK_FunctionToPointerDecay ||
CE->getCastKind() == CK_ArrayToPointerDecay)
return isLValueKnownNonNull(*this, CE->getSubExpr());
// Maybe honor __nonnull?
return false;
}
bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) {
const Expr *E = CE->getSubExpr();
if (CE->getCastKind() == CK_UncheckedDerivedToBase)
return false;
if (isa<CXXThisExpr>(E->IgnoreParens())) {
// We always assume that 'this' is never null.
return false;
}
if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
// And that glvalue casts are never null.
if (ICE->isGLValue())
return false;
}
return true;
}
template <typename GetElementTy>
static Value *
EmitHLSLElementwiseCastToVector(CodeGenFunction &CGF, QualType DestTy,
unsigned NumSrcElements,
GetElementTy GetElement, SourceLocation Loc) {
const auto *VecTy = DestTy->castAs<VectorType>();
assert(NumSrcElements >= VecTy->getNumElements() &&
"Flattened type on RHS must have the same number or more elements "
"than vector on LHS.");
Value *V = llvm::PoisonValue::get(CGF.ConvertType(DestTy));
for (unsigned I = 0, E = VecTy->getNumElements(); I < E; ++I) {
auto [Element, ElementTy] = GetElement(I);
Value *Cast = CGF.EmitScalarConversion(Element, ElementTy,
VecTy->getElementType(), Loc);
V = CGF.Builder.CreateInsertElement(V, Cast, I);
}
return V;
}
// RHS is an aggregate type
static Value *EmitHLSLElementwiseCast(CodeGenFunction &CGF, LValue SrcVal,
QualType DestTy, SourceLocation Loc) {
SmallVector<LValue, 16> LoadList;
CGF.FlattenAccessAndTypeLValue(SrcVal, LoadList);
// Dest is either a vector, constant matrix, or a builtin
if (DestTy->isVectorType())
return EmitHLSLElementwiseCastToVector(
CGF, DestTy, LoadList.size(),
[&](unsigned I) {
RValue RVal = CGF.EmitLoadOfLValue(LoadList[I], Loc);
assert(RVal.isScalar() &&
"All flattened source values should be scalars.");
return std::pair(RVal.getScalarVal(), LoadList[I].getType());
},
Loc);
if (auto *MatTy = DestTy->getAs<ConstantMatrixType>()) {
assert(LoadList.size() >= MatTy->getNumElementsFlattened() &&
"Flattened type on RHS must have the same number or more elements "
"than vector on LHS.");
llvm::Value *V = llvm::PoisonValue::get(CGF.ConvertType(DestTy));
// V is an allocated temporary for constructing the matrix.
for (unsigned Row = 0, RE = MatTy->getNumRows(); Row < RE; Row++) {
for (unsigned Col = 0, CE = MatTy->getNumColumns(); Col < CE; Col++) {
// When interpreted as a matrix, \p LoadList is *always* row-major order
// regardless of the default matrix memory layout.
unsigned LoadIdx = MatTy->getRowMajorFlattenedIndex(Row, Col);
RValue RVal = CGF.EmitLoadOfLValue(LoadList[LoadIdx], Loc);
assert(RVal.isScalar() &&
"All flattened source values should be scalars.");
llvm::Value *Cast = CGF.EmitScalarConversion(
RVal.getScalarVal(), LoadList[LoadIdx].getType(),
MatTy->getElementType(), Loc);
unsigned MatrixIdx = MatTy->getColumnMajorFlattenedIndex(Row, Col);
V = CGF.Builder.CreateInsertElement(V, Cast, MatrixIdx);
}
}
return V;
}
// if its a builtin just do an extract element or load.
assert(DestTy->isBuiltinType() &&
"Destination type must be a vector, matrix, or builtin type.");
RValue RVal = CGF.EmitLoadOfLValue(LoadList[0], Loc);
assert(RVal.isScalar() && "All flattened source values should be scalars.");
return CGF.EmitScalarConversion(RVal.getScalarVal(), LoadList[0].getType(),
DestTy, Loc);
}
// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
// have to handle a more broad range of conversions than explicit casts, as they
// handle things like function to ptr-to-function decay etc.
Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
llvm::scope_exit RestoreCurCast(
[this, Prev = CGF.CurCast] { CGF.CurCast = Prev; });
CGF.CurCast = CE;
Expr *E = CE->getSubExpr();
QualType DestTy = CE->getType();
CastKind Kind = CE->getCastKind();
CodeGenFunction::CGFPOptionsRAII FPOptions(CGF, CE);
// These cases are generally not written to ignore the result of
// evaluating their sub-expressions, so we clear this now.
bool Ignored = TestAndClearIgnoreResultAssign();
// Since almost all cast kinds apply to scalars, this switch doesn't have
// a default case, so the compiler will warn on a missing case. The cases
// are in the same order as in the CastKind enum.
switch (Kind) {
case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
case CK_BuiltinFnToFnPtr:
llvm_unreachable("builtin functions are handled elsewhere");
case CK_LValueBitCast:
case CK_ObjCObjectLValueCast: {
Address Addr = EmitLValue(E).getAddress();
Addr = Addr.withElementType(CGF.ConvertTypeForMem(DestTy));
LValue LV = CGF.MakeAddrLValue(Addr, DestTy);
return EmitLoadOfLValue(LV, CE->getExprLoc());
}
case CK_LValueToRValueBitCast: {
LValue SourceLVal = CGF.EmitLValue(E);
Address Addr =
SourceLVal.getAddress().withElementType(CGF.ConvertTypeForMem(DestTy));
LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
return EmitLoadOfLValue(DestLV, CE->getExprLoc());
}
case CK_CPointerToObjCPointerCast:
case CK_BlockPointerToObjCPointerCast:
case CK_AnyPointerToBlockPointerCast:
case CK_BitCast: {
Value *Src = Visit(E);
llvm::Type *SrcTy = Src->getType();
llvm::Type *DstTy = ConvertType(DestTy);
// FIXME: this is a gross but seemingly necessary workaround for an issue
// manifesting when a target uses a non-default AS for indirect sret args,
// but the source HLL is generic, wherein a valid C-cast or reinterpret_cast
// on the address of a local struct that gets returned by value yields an
// invalid bitcast from the a pointer to the IndirectAS to a pointer to the
// DefaultAS. We can only do this subversive thing because sret args are
// manufactured and them residing in the IndirectAS is a target specific
// detail, and doing an AS cast here still retains the semantics the user
// expects. It is desirable to remove this iff a better solution is found.
if (auto A = dyn_cast<llvm::Argument>(Src); A && A->hasStructRetAttr())
return CGF.performAddrSpaceCast(Src, DstTy);
// FIXME: Similarly to the sret case above, we need to handle BitCasts that
// involve implicit address space conversions. This arises when the source
// language lacks explicit address spaces, but the target's data layout
// assigns different address spaces (e.g., program address space for
// function pointers). Since Sema operates on Clang types (which don't carry
// this information) and selects CK_BitCast, we must detect the address
// space mismatch here in CodeGen when lowering to LLVM types. The most
// common case is casting function pointers (which get the program AS from
// the data layout) to/from object pointers (which use the default AS).
// Ideally, this would be resolved at a higher level, but that would require
// exposing data layout details to Sema.
if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() &&
SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) {
return CGF.performAddrSpaceCast(Src, DstTy);
}
assert(
(!SrcTy->isPtrOrPtrVectorTy() || !DstTy->isPtrOrPtrVectorTy() ||
SrcTy->getPointerAddressSpace() == DstTy->getPointerAddressSpace()) &&
"Address-space cast must be used to convert address spaces");
if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) {
if (auto *PT = DestTy->getAs<PointerType>()) {
CGF.EmitVTablePtrCheckForCast(
PT->getPointeeType(),
Address(Src,
CGF.ConvertTypeForMem(
E->getType()->castAs<PointerType>()->getPointeeType()),
CGF.getPointerAlign()),
/*MayBeNull=*/true, CodeGenFunction::CFITCK_UnrelatedCast,
CE->getBeginLoc());
}
}
if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) {
const QualType SrcType = E->getType();
if (SrcType.mayBeNotDynamicClass() && DestTy.mayBeDynamicClass()) {
// Casting to pointer that could carry dynamic information (provided by
// invariant.group) requires launder.
Src = Builder.CreateLaunderInvariantGroup(Src);
}
}
// Update heapallocsite metadata when there is an explicit pointer cast.
if (auto *CI = dyn_cast<llvm::CallBase>(Src)) {
if (CI->getMetadata("heapallocsite") && isa<ExplicitCastExpr>(CE) &&
!isa<CastExpr>(E)) {
QualType PointeeType = DestTy->getPointeeType();
if (!PointeeType.isNull())
CGF.getDebugInfo()->addHeapAllocSiteMetadata(CI, PointeeType,
CE->getExprLoc());
}
}
// If Src is a fixed vector and Dst is a scalable vector, and both have the
// same element type, use the llvm.vector.insert intrinsic to perform the
// bitcast.
if (auto *FixedSrcTy = dyn_cast<llvm::FixedVectorType>(SrcTy)) {
if (auto *ScalableDstTy = dyn_cast<llvm::ScalableVectorType>(DstTy)) {
// If we are casting a fixed i8 vector to a scalable i1 predicate
// vector, use a vector insert and bitcast the result.
if (ScalableDstTy->getElementType()->isIntegerTy(1) &&
FixedSrcTy->getElementType()->isIntegerTy(8)) {
ScalableDstTy = llvm::ScalableVectorType::get(
FixedSrcTy->getElementType(),
llvm::divideCeil(
ScalableDstTy->getElementCount().getKnownMinValue(), 8));
}
if (FixedSrcTy->getElementType() == ScalableDstTy->getElementType()) {
llvm::Value *PoisonVec = llvm::PoisonValue::get(ScalableDstTy);
llvm::Value *Result = Builder.CreateInsertVector(
ScalableDstTy, PoisonVec, Src, uint64_t(0), "cast.scalable");
ScalableDstTy = cast<llvm::ScalableVectorType>(
llvm::VectorType::getWithSizeAndScalar(ScalableDstTy, DstTy));
if (Result->getType() != ScalableDstTy)
Result = Builder.CreateBitCast(Result, ScalableDstTy);
if (Result->getType() != DstTy)
Result = Builder.CreateExtractVector(DstTy, Result, uint64_t(0));
return Result;
}
}
}
// If Src is a scalable vector and Dst is a fixed vector, and both have the
// same element type, use the llvm.vector.extract intrinsic to perform the
// bitcast.
if (auto *ScalableSrcTy = dyn_cast<llvm::ScalableVectorType>(SrcTy)) {
if (auto *FixedDstTy = dyn_cast<llvm::FixedVectorType>(DstTy)) {
// If we are casting a scalable i1 predicate vector to a fixed i8
// vector, bitcast the source and use a vector extract.
if (ScalableSrcTy->getElementType()->isIntegerTy(1) &&
FixedDstTy->getElementType()->isIntegerTy(8)) {
if (!ScalableSrcTy->getElementCount().isKnownMultipleOf(8)) {
ScalableSrcTy = llvm::ScalableVectorType::get(
ScalableSrcTy->getElementType(),
llvm::alignTo<8>(
ScalableSrcTy->getElementCount().getKnownMinValue()));
llvm::Value *ZeroVec = llvm::Constant::getNullValue(ScalableSrcTy);
Src = Builder.CreateInsertVector(ScalableSrcTy, ZeroVec, Src,
uint64_t(0));
}
ScalableSrcTy = llvm::ScalableVectorType::get(
FixedDstTy->getElementType(),
ScalableSrcTy->getElementCount().getKnownMinValue() / 8);
Src = Builder.CreateBitCast(Src, ScalableSrcTy);
}
if (ScalableSrcTy->getElementType() == FixedDstTy->getElementType())
return Builder.CreateExtractVector(DstTy, Src, uint64_t(0),
"cast.fixed");
}
}
// Perform VLAT <-> VLST bitcast through memory.
// TODO: since the llvm.vector.{insert,extract} intrinsics
// require the element types of the vectors to be the same, we
// need to keep this around for bitcasts between VLAT <-> VLST where
// the element types of the vectors are not the same, until we figure
// out a better way of doing these casts.
if ((isa<llvm::FixedVectorType>(SrcTy) &&
isa<llvm::ScalableVectorType>(DstTy)) ||
(isa<llvm::ScalableVectorType>(SrcTy) &&
isa<llvm::FixedVectorType>(DstTy))) {
Address Addr = CGF.CreateDefaultAlignTempAlloca(SrcTy, "saved-value");
LValue LV = CGF.MakeAddrLValue(Addr, E->getType());
CGF.EmitStoreOfScalar(Src, LV);
Addr = Addr.withElementType(CGF.ConvertTypeForMem(DestTy));
LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy);
DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo());
return EmitLoadOfLValue(DestLV, CE->getExprLoc());
}
llvm::Value *Result = Builder.CreateBitCast(Src, DstTy);
return CGF.authPointerToPointerCast(Result, E->getType(), DestTy);
}
case CK_AddressSpaceConversion: {
llvm::Type *DestLTy = ConvertType(DestTy);
// WebAssembly reference types are opaque target extension types so an
// "address space conversion" involving them is not a real pointer cast.
auto IsWasmFuncref = [](llvm::Type *T) {
auto *TET = dyn_cast<llvm::TargetExtType>(T);
return TET && TET->getName() == "wasm.funcref";
};
bool SrcIsFuncref = IsWasmFuncref(ConvertType(E->getType()));
bool DestIsFuncref = IsWasmFuncref(DestLTy);
if (SrcIsFuncref && DestIsFuncref) {
// funcref -> funcref (e.g. between differently-typed funcrefs) is the
// identity on the opaque reference value.
return Visit(E);
}
if (SrcIsFuncref && !DestIsFuncref) {
// funcref -> pointer: use wasm_funcref_to_ptr. This will probably crash
// later in codegen since we haven't implemented a way to actually get a
// function pointer from a funcref.
llvm::Function *ToPtr =
CGF.CGM.getIntrinsic(llvm::Intrinsic::wasm_funcref_to_ptr);
return CGF.Builder.CreateCall(ToPtr, {Visit(E)});
}
if (!SrcIsFuncref && DestIsFuncref) {
// A null function pointer converts to a null funcref (ref.null func),
// rather than a table lookup at index 0.
Expr::EvalResult NullResult;
if (E->EvaluateAsRValue(NullResult, CGF.getContext()) &&
NullResult.Val.isNullPointer()) {
if (NullResult.HasSideEffects)
Visit(E);
return llvm::Constant::getNullValue(DestLTy);
}
// pointer -> funcref: do a table.get from the indirect function table.
llvm::Function *ToFuncref =
CGF.CGM.getIntrinsic(llvm::Intrinsic::wasm_ptr_to_funcref);
return CGF.Builder.CreateCall(ToFuncref, {Visit(E)});
}
Expr::EvalResult Result;
if (E->EvaluateAsRValue(Result, CGF.getContext()) &&
Result.Val.isNullPointer()) {
// If E has side effect, it is emitted even if its final result is a
// null pointer. In that case, a DCE pass should be able to
// eliminate the useless instructions emitted during translating E.
if (Result.HasSideEffects)
Visit(E);
return CGF.CGM.getNullPointer(cast<llvm::PointerType>(DestLTy), DestTy);
}
// Since target may map different address spaces in AST to the same address
// space, an address space conversion may end up as a bitcast.
return CGF.performAddrSpaceCast(Visit(E), DestLTy);
}
case CK_AtomicToNonAtomic:
case CK_NonAtomicToAtomic:
case CK_UserDefinedConversion:
return Visit(E);
case CK_NoOp: {
return CE->changesVolatileQualification() ? EmitLoadOfLValue(CE) : Visit(E);
}
case CK_BaseToDerived: {
const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
Address Base = CGF.EmitPointerWithAlignment(E);
Address Derived =
CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl,
CE->path_begin(), CE->path_end(),
CGF.ShouldNullCheckClassCastValue(CE));
// C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
// performed and the object is not of the derived type.
if (CGF.sanitizePerformTypeCheck())
CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
Derived, DestTy->getPointeeType());
if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast))
CGF.EmitVTablePtrCheckForCast(DestTy->getPointeeType(), Derived,
/*MayBeNull=*/true,
CodeGenFunction::CFITCK_DerivedCast,
CE->getBeginLoc());
return CGF.getAsNaturalPointerTo(Derived, CE->getType()->getPointeeType());
}
case CK_UncheckedDerivedToBase:
case CK_DerivedToBase: {
// The EmitPointerWithAlignment path does this fine; just discard
// the alignment.
return CGF.getAsNaturalPointerTo(CGF.EmitPointerWithAlignment(CE),
CE->getType()->getPointeeType());
}
case CK_Dynamic: {
Address V = CGF.EmitPointerWithAlignment(E);
const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
return CGF.EmitDynamicCast(V, DCE);
}
case CK_ArrayToPointerDecay:
return CGF.getAsNaturalPointerTo(CGF.EmitArrayToPointerDecay(E),
CE->getType()->getPointeeType());
case CK_FunctionToPointerDecay:
return EmitLValue(E).getPointer(CGF);
case CK_NullToPointer:
if (MustVisitNullValue(E))
CGF.EmitIgnoredExpr(E);
return CGF.CGM.getNullPointer(cast<llvm::PointerType>(ConvertType(DestTy)),
DestTy);
case CK_NullToMemberPointer: {
if (MustVisitNullValue(E))
CGF.EmitIgnoredExpr(E);
const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
}
case CK_ReinterpretMemberPointer:
case CK_BaseToDerivedMemberPointer:
case CK_DerivedToBaseMemberPointer: {
Value *Src = Visit(E);
// Note that the AST doesn't distinguish between checked and
// unchecked member pointer conversions, so we always have to
// implement checked conversions here. This is inefficient when
// actual control flow may be required in order to perform the
// check, which it is for data member pointers (but not member
// function pointers on Itanium and ARM).
return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
}
case CK_ARCProduceObject:
return CGF.EmitARCRetainScalarExpr(E);
case CK_ARCConsumeObject:
return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
case CK_ARCReclaimReturnedObject:
return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored);
case CK_ARCExtendBlockObject:
return CGF.EmitARCExtendBlockObject(E);
case CK_CopyAndAutoreleaseBlockObject:
return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
case CK_FloatingRealToComplex:
case CK_FloatingComplexCast:
case CK_IntegralRealToComplex:
case CK_IntegralComplexCast:
case CK_IntegralComplexToFloatingComplex:
case CK_FloatingComplexToIntegralComplex:
case CK_ConstructorConversion:
case CK_ToUnion:
case CK_HLSLArrayRValue:
llvm_unreachable("scalar cast to non-scalar value");
case CK_LValueToRValue:
assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
return Visit(E);
case CK_IntegralToPointer: {
Value *Src = Visit(E);
// First, convert to the correct width so that we control the kind of
// extension.
auto DestLLVMTy = ConvertType(DestTy);
llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DestLLVMTy);
bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
llvm::Value* IntResult =
Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
auto *IntToPtr = Builder.CreateIntToPtr(IntResult, DestLLVMTy);
if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) {
// Going from integer to pointer that could be dynamic requires reloading
// dynamic information from invariant.group.
if (DestTy.mayBeDynamicClass())
IntToPtr = Builder.CreateLaunderInvariantGroup(IntToPtr);
}
IntToPtr = CGF.authPointerToPointerCast(IntToPtr, E->getType(), DestTy);
return IntToPtr;
}
case CK_PointerToIntegral: {
assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
auto *PtrExpr =
CGF.authPointerToPointerCast(Visit(E), E->getType(), DestTy);
return Builder.CreatePtrToInt(PtrExpr, ConvertType(DestTy));
}
case CK_ToVoid: {
CGF.EmitIgnoredExpr(E);
return nullptr;
}
case CK_MatrixCast: {
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
}
// CK_HLSLAggregateSplatCast only handles splatting to vectors from a vec1
// Casts were inserted in Sema to Cast the Src Expr to a Scalar and
// To perform any necessary Scalar Cast, so this Cast can be handled
// by the regular Vector Splat cast code.
case CK_HLSLAggregateSplatCast:
case CK_VectorSplat: {
llvm::Type *DstTy = ConvertType(DestTy);
Value *Elt = Visit(E);
// Splat the element across to all elements
llvm::ElementCount NumElements =
cast<llvm::VectorType>(DstTy)->getElementCount();
return Builder.CreateVectorSplat(NumElements, Elt, "splat");
}
case CK_FixedPointCast:
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
case CK_FixedPointToBoolean:
assert(E->getType()->isFixedPointType() &&
"Expected src type to be fixed point type");
assert(DestTy->isBooleanType() && "Expected dest type to be boolean type");
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
case CK_FixedPointToIntegral:
assert(E->getType()->isFixedPointType() &&
"Expected src type to be fixed point type");
assert(DestTy->isIntegerType() && "Expected dest type to be an integer");
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
case CK_IntegralToFixedPoint:
assert(E->getType()->isIntegerType() &&
"Expected src type to be an integer");
assert(DestTy->isFixedPointType() &&
"Expected dest type to be fixed point type");
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
case CK_IntegralCast: {
if (E->getType()->isExtVectorType() && DestTy->isExtVectorType()) {
QualType SrcElTy = E->getType()->castAs<VectorType>()->getElementType();
return Builder.CreateIntCast(Visit(E), ConvertType(DestTy),
SrcElTy->isSignedIntegerOrEnumerationType(),
"conv");
}
ScalarConversionOpts Opts;
if (auto *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
if (!ICE->isPartOfExplicitCast())
Opts = ScalarConversionOpts(CGF.SanOpts);
}
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc(), Opts);
}
case CK_IntegralToFloating: {
if (E->getType()->isVectorType() && DestTy->isVectorType()) {
// TODO: Support constrained FP intrinsics.
QualType SrcElTy = E->getType()->castAs<VectorType>()->getElementType();
if (SrcElTy->isSignedIntegerOrEnumerationType())
return Builder.CreateSIToFP(Visit(E), ConvertType(DestTy), "conv");
return Builder.CreateUIToFP(Visit(E), ConvertType(DestTy), "conv");
}
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, CE);
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
}
case CK_FloatingToIntegral: {
if (E->getType()->isVectorType() && DestTy->isVectorType()) {
// TODO: Support constrained FP intrinsics.
QualType DstElTy = DestTy->castAs<VectorType>()->getElementType();
if (DstElTy->isSignedIntegerOrEnumerationType())
return Builder.CreateFPToSI(Visit(E), ConvertType(DestTy), "conv");
return Builder.CreateFPToUI(Visit(E), ConvertType(DestTy), "conv");
}
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, CE);
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
}
case CK_FloatingCast: {
if (E->getType()->isVectorType() && DestTy->isVectorType()) {
// TODO: Support constrained FP intrinsics.
QualType SrcElTy = E->getType()->castAs<VectorType>()->getElementType();
QualType DstElTy = DestTy->castAs<VectorType>()->getElementType();
if (DstElTy->castAs<BuiltinType>()->getKind() <
SrcElTy->castAs<BuiltinType>()->getKind())
return Builder.CreateFPTrunc(Visit(E), ConvertType(DestTy), "conv");
return Builder.CreateFPExt(Visit(E), ConvertType(DestTy), "conv");
}
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, CE);
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
}
case CK_FixedPointToFloating:
case CK_FloatingToFixedPoint: {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, CE);
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc());
}
case CK_BooleanToSignedIntegral: {
ScalarConversionOpts Opts;
Opts.TreatBooleanAsSigned = true;
return EmitScalarConversion(Visit(E), E->getType(), DestTy,
CE->getExprLoc(), Opts);
}
case CK_IntegralToBoolean:
return EmitIntToBoolConversion(Visit(E));
case CK_PointerToBoolean:
return EmitPointerToBoolConversion(Visit(E), E->getType());
case CK_FloatingToBoolean: {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, CE);
return EmitFloatToBoolConversion(Visit(E));
}
case CK_MemberPointerToBoolean: {
llvm::Value *MemPtr = Visit(E);
const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
}
case CK_FloatingComplexToReal:
case CK_IntegralComplexToReal:
return CGF.EmitComplexExpr(E, false, true).first;
case CK_FloatingComplexToBoolean:
case CK_IntegralComplexToBoolean: {
CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
// TODO: kill this function off, inline appropriate case here
return EmitComplexToScalarConversion(V, E->getType(), DestTy,
CE->getExprLoc());
}
case CK_ZeroToOCLOpaqueType: {
assert((DestTy->isEventT() || DestTy->isQueueT() ||
DestTy->isOCLIntelSubgroupAVCType()) &&
"CK_ZeroToOCLEvent cast on non-event type");
return llvm::Constant::getNullValue(ConvertType(DestTy));
}
case CK_IntToOCLSampler:
return CGF.CGM.createOpenCLIntToSamplerConversion(E, CGF);
case CK_HLSLVectorTruncation: {
assert((DestTy->isVectorType() || DestTy->isBuiltinType()) &&
"Destination type must be a vector or builtin type.");
Value *Vec = Visit(E);
if (auto *VecTy = DestTy->getAs<VectorType>()) {
SmallVector<int> Mask;
unsigned NumElts = VecTy->getNumElements();
for (unsigned I = 0; I != NumElts; ++I)
Mask.push_back(I);
return Builder.CreateShuffleVector(Vec, Mask, "trunc");
}
llvm::Value *Zero = llvm::Constant::getNullValue(CGF.SizeTy);
return Builder.CreateExtractElement(Vec, Zero, "cast.vtrunc");
}
case CK_HLSLMatrixTruncation: {
assert((DestTy->isMatrixType() || DestTy->isBuiltinType()) &&
"Destination type must be a matrix or builtin type.");
Value *Mat = Visit(E);
if (auto *MatTy = DestTy->getAs<ConstantMatrixType>()) {
SmallVector<int> Mask(MatTy->getNumElementsFlattened());
unsigned NumCols = MatTy->getNumColumns();
unsigned NumRows = MatTy->getNumRows();
auto *SrcMatTy = E->getType()->getAs<ConstantMatrixType>();
assert(SrcMatTy && "Source type must be a matrix type.");
assert(NumRows <= SrcMatTy->getNumRows());
assert(NumCols <= SrcMatTy->getNumColumns());
for (unsigned R = 0; R < NumRows; R++)
for (unsigned C = 0; C < NumCols; C++)
Mask[MatTy->getColumnMajorFlattenedIndex(R, C)] =
SrcMatTy->getColumnMajorFlattenedIndex(R, C);
return Builder.CreateShuffleVector(Mat, Mask, "trunc");
}
llvm::Value *Zero = llvm::Constant::getNullValue(CGF.SizeTy);
return Builder.CreateExtractElement(Mat, Zero, "cast.mtrunc");
}
case CK_HLSLElementwiseCast: {
RValue RV = CGF.EmitAnyExpr(E);
SourceLocation Loc = CE->getExprLoc();
if (const auto *SrcMatTy = E->getType()->getAs<ConstantMatrixType>()) {
assert(DestTy->isVectorType() &&
"Matrix elementwise cast destination must be a vector");
assert(RV.isScalar() && "Matrix rvalue must have scalar representation");
Value *SrcVal = RV.getScalarVal();
return EmitHLSLElementwiseCastToVector(
CGF, DestTy, SrcMatTy->getNumElementsFlattened(),
[&](unsigned I) {
unsigned Row = I / SrcMatTy->getNumColumns();
unsigned Col = I % SrcMatTy->getNumColumns();
unsigned Idx = SrcMatTy->getColumnMajorFlattenedIndex(Row, Col);
Value *Element =
Builder.CreateExtractElement(SrcVal, Idx, "matrixext");
return std::pair(Element, SrcMatTy->getElementType());
},
Loc);
}
Address SrcAddr = Address::invalid();
if (RV.isAggregate()) {
SrcAddr = RV.getAggregateAddress();
} else {
SrcAddr = CGF.CreateMemTemp(E->getType(), "hlsl.ewcast.src");
LValue TmpLV = CGF.MakeAddrLValue(SrcAddr, E->getType());
CGF.EmitStoreThroughLValue(RV, TmpLV);
}
LValue SrcVal = CGF.MakeAddrLValue(SrcAddr, E->getType());
return EmitHLSLElementwiseCast(CGF, SrcVal, DestTy, Loc);
}
} // end of switch
llvm_unreachable("unknown scalar cast");
}
Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
CodeGenFunction::StmtExprEvaluation eval(CGF);
Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(),
!E->getType()->isVoidType());
if (!RetAlloca.isValid())
return nullptr;
return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()),
E->getExprLoc());
}
Value *ScalarExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) {
CodeGenFunction::RunCleanupsScope Scope(CGF);
Value *V = Visit(E->getSubExpr());
// Defend against dominance problems caused by jumps out of expression
// evaluation through the shared cleanup block.
Scope.ForceCleanup({&V});
return V;
}
//===----------------------------------------------------------------------===//
// Unary Operators
//===----------------------------------------------------------------------===//
static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E,
llvm::Value *InVal, bool IsInc,
FPOptions FPFeatures) {
BinOpInfo BinOp;
BinOp.LHS = InVal;
BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false);
BinOp.Ty = E->getType();
BinOp.Opcode = IsInc ? BO_Add : BO_Sub;
BinOp.FPFeatures = FPFeatures;
BinOp.E = E;
return BinOp;
}
llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior(
const UnaryOperator *E, llvm::Value *InVal, bool IsInc) {
// Treat positive amount as unsigned to support inc of i1 (needed for
// unsigned _BitInt(1)).
llvm::Value *Amount =
llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, !IsInc);
StringRef Name = IsInc ? "inc" : "dec";
QualType Ty = E->getType();
const bool isSigned = Ty->isSignedIntegerOrEnumerationType();
const bool hasSan =
isSigned ? CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)
: CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow);
switch (getOverflowBehaviorConsideringType(CGF, Ty)) {
case LangOptions::OB_Wrap:
return Builder.CreateAdd(InVal, Amount, Name);
case LangOptions::OB_SignedAndDefined:
if (!hasSan)
return Builder.CreateAdd(InVal, Amount, Name);
[[fallthrough]];
case LangOptions::OB_Unset:
if (!E->canOverflow())
return Builder.CreateAdd(InVal, Amount, Name);
if (!hasSan)
return isSigned ? Builder.CreateNSWAdd(InVal, Amount, Name)
: Builder.CreateAdd(InVal, Amount, Name);
[[fallthrough]];
case LangOptions::OB_Trap:
if (!Ty->getAs<OverflowBehaviorType>() && !E->canOverflow())
return Builder.CreateAdd(InVal, Amount, Name);
BinOpInfo Info = createBinOpInfoFromIncDec(
E, InVal, IsInc, E->getFPFeaturesInEffect(CGF.getLangOpts()));
if (CanElideOverflowCheck(CGF.getContext(), Info))
return isSigned ? Builder.CreateNSWAdd(InVal, Amount, Name)
: Builder.CreateAdd(InVal, Amount, Name);
return EmitOverflowCheckedBinOp(Info);
}
llvm_unreachable("Unknown OverflowBehaviorKind");
}
namespace {
/// Handles check and update for lastprivate conditional variables.
class OMPLastprivateConditionalUpdateRAII {
private:
CodeGenFunction &CGF;
const UnaryOperator *E;
public:
OMPLastprivateConditionalUpdateRAII(CodeGenFunction &CGF,
const UnaryOperator *E)
: CGF(CGF), E(E) {}
~OMPLastprivateConditionalUpdateRAII() {
if (CGF.getLangOpts().OpenMP)
CGF.CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(
CGF, E->getSubExpr());
}
};
} // namespace
llvm::Value *
ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
bool isInc, bool isPre) {
ApplyAtomGroup Grp(CGF.getDebugInfo());
OMPLastprivateConditionalUpdateRAII OMPRegion(CGF, E);
QualType type = E->getSubExpr()->getType();
llvm::PHINode *atomicPHI = nullptr;
llvm::Value *value;
llvm::Value *input;
llvm::Value *Previous = nullptr;
QualType SrcType = E->getType();
int amount = (isInc ? 1 : -1);
bool isSubtraction = !isInc;
if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
type = atomicTy->getValueType();
if (isInc && type->isBooleanType()) {
llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
if (isPre) {
Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified())
->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent);
return Builder.getTrue();
}
// For atomic bool increment, we just store true and return it for
// preincrement, do an atomic swap with true for postincrement
return Builder.CreateAtomicRMW(
llvm::AtomicRMWInst::Xchg, LV.getAddress(), True,
llvm::AtomicOrdering::SequentiallyConsistent);
}
// Special case for atomic increment / decrement on integers, emit
// atomicrmw instructions. We skip this if we want to be doing overflow
// checking, and fall into the slow path with the atomic cmpxchg loop.
if (!type->isBooleanType() && type->isIntegerType() &&
!(type->isUnsignedIntegerType() &&
CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
CGF.getLangOpts().getSignedOverflowBehavior() !=
LangOptions::SOB_Trapping) {
llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
llvm::AtomicRMWInst::Sub;
llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
llvm::Instruction::Sub;
llvm::Value *amt = CGF.EmitToMemory(
llvm::ConstantInt::get(ConvertType(type), 1, true), type);
llvm::Value *old =
Builder.CreateAtomicRMW(aop, LV.getAddress(), amt,
llvm::AtomicOrdering::SequentiallyConsistent);
return isPre ? Builder.CreateBinOp(op, old, amt) : old;
}
// Special case for atomic increment/decrement on floats.
// Bail out non-power-of-2-sized floating point types (e.g., x86_fp80).
if (type->isFloatingType()) {
llvm::Type *Ty = ConvertType(type);
if (llvm::has_single_bit(Ty->getScalarSizeInBits())) {
llvm::AtomicRMWInst::BinOp aop =
isInc ? llvm::AtomicRMWInst::FAdd : llvm::AtomicRMWInst::FSub;
llvm::Instruction::BinaryOps op =
isInc ? llvm::Instruction::FAdd : llvm::Instruction::FSub;
llvm::Value *amt = llvm::ConstantFP::get(Ty, 1.0);
llvm::AtomicRMWInst *old =
CGF.emitAtomicRMWInst(aop, LV.getAddress(), amt,
llvm::AtomicOrdering::SequentiallyConsistent);
return isPre ? Builder.CreateBinOp(op, old, amt) : old;
}
}
value = EmitLoadOfLValue(LV, E->getExprLoc());
input = value;
// For every other atomic operation, we need to emit a load-op-cmpxchg loop
llvm::BasicBlock *startBB = Builder.GetInsertBlock();
llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
value = CGF.EmitToMemory(value, type);
Builder.CreateBr(opBB);
Builder.SetInsertPoint(opBB);
atomicPHI = Builder.CreatePHI(value->getType(), 2);
atomicPHI->addIncoming(value, startBB);
value = atomicPHI;
} else {
value = EmitLoadOfLValue(LV, E->getExprLoc());
input = value;
}
// Special case of integer increment that we have to check first: bool++.
// Due to promotion rules, we get:
// bool++ -> bool = bool + 1
// -> bool = (int)bool + 1
// -> bool = ((int)bool + 1 != 0)
// An interesting aspect of this is that increment is always true.
// Decrement does not have this property.
if (isInc && type->isBooleanType()) {
value = Builder.getTrue();
// Most common case by far: integer increment.
} else if (type->isIntegerType()) {
QualType promotedType;
bool canPerformLossyDemotionCheck = false;
if (CGF.getContext().isPromotableIntegerType(type)) {
promotedType = CGF.getContext().getPromotedIntegerType(type);
assert(promotedType != type && "Shouldn't promote to the same type.");
canPerformLossyDemotionCheck = true;
canPerformLossyDemotionCheck &=
CGF.getContext().getCanonicalType(type) !=
CGF.getContext().getCanonicalType(promotedType);
canPerformLossyDemotionCheck &=
PromotionIsPotentiallyEligibleForImplicitIntegerConversionCheck(
type, promotedType);
assert((!canPerformLossyDemotionCheck ||
type->isSignedIntegerOrEnumerationType() ||
promotedType->isSignedIntegerOrEnumerationType() ||
ConvertType(type)->getScalarSizeInBits() ==
ConvertType(promotedType)->getScalarSizeInBits()) &&
"The following check expects that if we do promotion to different "
"underlying canonical type, at least one of the types (either "
"base or promoted) will be signed, or the bitwidths will match.");
}
if (CGF.SanOpts.hasOneOf(
SanitizerKind::ImplicitIntegerArithmeticValueChange |
SanitizerKind::ImplicitBitfieldConversion) &&
canPerformLossyDemotionCheck) {
// While `x += 1` (for `x` with width less than int) is modeled as
// promotion+arithmetics+demotion, and we can catch lossy demotion with
// ease; inc/dec with width less than int can't overflow because of
// promotion rules, so we omit promotion+demotion, which means that we can
// not catch lossy "demotion". Because we still want to catch these cases
// when the sanitizer is enabled, we perform the promotion, then perform
// the increment/decrement in the wider type, and finally
// perform the demotion. This will catch lossy demotions.
// We have a special case for bitfields defined using all the bits of the
// type. In this case we need to do the same trick as for the integer
// sanitizer checks, i.e., promotion -> increment/decrement -> demotion.
value = EmitScalarConversion(value, type, promotedType, E->getExprLoc());
Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
// Do pass non-default ScalarConversionOpts so that sanitizer check is
// emitted if LV is not a bitfield, otherwise the bitfield sanitizer
// checks will take care of the conversion.
ScalarConversionOpts Opts;
if (!LV.isBitField())
Opts = ScalarConversionOpts(CGF.SanOpts);
else if (CGF.SanOpts.has(SanitizerKind::ImplicitBitfieldConversion)) {
Previous = value;
SrcType = promotedType;
}
Opts.PatternExcluded = CGF.getContext().isUnaryOverflowPatternExcluded(E);
value = EmitScalarConversion(value, promotedType, type, E->getExprLoc(),
Opts);
// Note that signed integer inc/dec with width less than int can't
// overflow because of promotion rules; we're just eliding a few steps
// here.
} else if (type->isSignedIntegerOrEnumerationType() ||
type->isUnsignedIntegerType()) {
value = EmitIncDecConsiderOverflowBehavior(E, value, isInc);
} else {
// Treat positive amount as unsigned to support inc of i1 (needed for
// unsigned _BitInt(1)).
llvm::Value *amt =
llvm::ConstantInt::get(value->getType(), amount, !isInc);
value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
}
// Next most common: pointer increment.
} else if (const PointerType *ptr = type->getAs<PointerType>()) {
QualType type = ptr->getPointeeType();
// VLA types don't have constant size.
if (const VariableArrayType *vla
= CGF.getContext().getAsVariableArrayType(type)) {
llvm::Value *numElts = CGF.getVLASize(vla).NumElts;
if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
llvm::Type *elemTy = CGF.ConvertTypeForMem(vla->getElementType());
if (CGF.getLangOpts().PointerOverflowDefined)
value = Builder.CreateGEP(elemTy, value, numElts, "vla.inc");
else
value = CGF.EmitCheckedInBoundsGEP(
elemTy, value, numElts, /*SignedIndices=*/false, isSubtraction,
E->getExprLoc(), "vla.inc");
// Arithmetic on function pointers (!) is just +-1.
} else if (type->isFunctionType()) {
llvm::Value *amt = Builder.getInt32(amount);
if (CGF.getLangOpts().PointerOverflowDefined)
value = Builder.CreateGEP(CGF.Int8Ty, value, amt, "incdec.funcptr");
else
value =
CGF.EmitCheckedInBoundsGEP(CGF.Int8Ty, value, amt,
/*SignedIndices=*/false, isSubtraction,
E->getExprLoc(), "incdec.funcptr");
// For everything else, we can just do a simple increment.
} else {
llvm::Value *amt = Builder.getInt32(amount);
llvm::Type *elemTy = CGF.ConvertTypeForMem(type);
if (CGF.getLangOpts().PointerOverflowDefined)
value = Builder.CreateGEP(elemTy, value, amt, "incdec.ptr");
else
value = CGF.EmitCheckedInBoundsGEP(
elemTy, value, amt, /*SignedIndices=*/false, isSubtraction,
E->getExprLoc(), "incdec.ptr");
}
// Vector increment/decrement.
} else if (type->isVectorType()) {
if (type->hasIntegerRepresentation()) {
llvm::Value *amt = llvm::ConstantInt::getSigned(value->getType(), amount);
value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
} else {
value = Builder.CreateFAdd(
value,
llvm::ConstantFP::get(value->getType(), amount),
isInc ? "inc" : "dec");
}
// Floating point.
} else if (type->isRealFloatingType()) {
// Add the inc/dec to the real part.
llvm::Value *amt;
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
// Another special case: half FP increment should be done via float.
if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
value = Builder.CreateFPExt(value, CGF.CGM.FloatTy, "incdec.conv");
if (value->getType()->isFloatTy())
amt = llvm::ConstantFP::get(VMContext,
llvm::APFloat(static_cast<float>(amount)));
else if (value->getType()->isDoubleTy())
amt = llvm::ConstantFP::get(VMContext,
llvm::APFloat(static_cast<double>(amount)));
else {
// Remaining types are Half, Bfloat16, LongDouble, __ibm128 or __float128.
// Convert from float.
llvm::APFloat F(static_cast<float>(amount));
bool ignored;
const llvm::fltSemantics *FS;
// Don't use getFloatTypeSemantics because Half isn't
// necessarily represented using the "half" LLVM type.
if (value->getType()->isFP128Ty())
FS = &CGF.getTarget().getFloat128Format();
else if (value->getType()->isHalfTy())
FS = &CGF.getTarget().getHalfFormat();
else if (value->getType()->isBFloatTy())
FS = &CGF.getTarget().getBFloat16Format();
else if (value->getType()->isPPC_FP128Ty())
FS = &CGF.getTarget().getIbm128Format();
else
FS = &CGF.getTarget().getLongDoubleFormat();
F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored);
amt = llvm::ConstantFP::get(VMContext, F);
}
value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
value = Builder.CreateFPTrunc(value, CGF.CGM.HalfTy, "incdec.conv");
// Fixed-point types.
} else if (type->isFixedPointType()) {
// Fixed-point types are tricky. In some cases, it isn't possible to
// represent a 1 or a -1 in the type at all. Piggyback off of
// EmitFixedPointBinOp to avoid having to reimplement saturation.
BinOpInfo Info;
Info.E = E;
Info.Ty = E->getType();
Info.Opcode = isInc ? BO_Add : BO_Sub;
Info.LHS = value;
Info.RHS = llvm::ConstantInt::get(value->getType(), 1, false);
// If the type is signed, it's better to represent this as +(-1) or -(-1),
// since -1 is guaranteed to be representable.
if (type->isSignedFixedPointType()) {
Info.Opcode = isInc ? BO_Sub : BO_Add;
Info.RHS = Builder.CreateNeg(Info.RHS);
}
// Now, convert from our invented integer literal to the type of the unary
// op. This will upscale and saturate if necessary. This value can become
// undef in some cases.
llvm::FixedPointBuilder<CGBuilderTy> FPBuilder(Builder);
auto DstSema = CGF.getContext().getFixedPointSemantics(Info.Ty);
Info.RHS = FPBuilder.CreateIntegerToFixed(Info.RHS, true, DstSema);
value = EmitFixedPointBinOp(Info);
// Objective-C pointer types.
} else {
const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
if (!isInc) size = -size;
llvm::Value *sizeValue =
llvm::ConstantInt::getSigned(CGF.SizeTy, size.getQuantity());
if (CGF.getLangOpts().PointerOverflowDefined)
value = Builder.CreateGEP(CGF.Int8Ty, value, sizeValue, "incdec.objptr");
else
value = CGF.EmitCheckedInBoundsGEP(
CGF.Int8Ty, value, sizeValue, /*SignedIndices=*/false, isSubtraction,
E->getExprLoc(), "incdec.objptr");
value = Builder.CreateBitCast(value, input->getType());
}
if (atomicPHI) {
llvm::BasicBlock *curBlock = Builder.GetInsertBlock();
llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
auto Pair = CGF.EmitAtomicCompareExchange(
LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc());
llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type);
llvm::Value *success = Pair.second;
atomicPHI->addIncoming(old, curBlock);
Builder.CreateCondBr(success, contBB, atomicPHI->getParent());
Builder.SetInsertPoint(contBB);
return isPre ? value : input;
}
// Store the updated result through the lvalue.
if (LV.isBitField()) {
Value *Src = Previous ? Previous : value;
CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
CGF.EmitBitfieldConversionCheck(Src, SrcType, value, E->getType(),
LV.getBitFieldInfo(), E->getExprLoc());
} else
CGF.EmitStoreThroughLValue(RValue::get(value), LV);
// If this is a postinc, return the value read from memory, otherwise use the
// updated value.
return isPre ? value : input;
}
Value *ScalarExprEmitter::VisitUnaryPlus(const UnaryOperator *E,
QualType PromotionType) {
QualType promotionTy = PromotionType.isNull()
? getPromotionType(E->getSubExpr()->getType())
: PromotionType;
Value *result = VisitPlus(E, promotionTy);
if (result && !promotionTy.isNull())
result = EmitUnPromotedValue(result, E->getType());
return result;
}
Value *ScalarExprEmitter::VisitPlus(const UnaryOperator *E,
QualType PromotionType) {
// This differs from gcc, though, most likely due to a bug in gcc.
TestAndClearIgnoreResultAssign();
if (!PromotionType.isNull())
return CGF.EmitPromotedScalarExpr(E->getSubExpr(), PromotionType);
return Visit(E->getSubExpr());
}
Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E,
QualType PromotionType) {
QualType promotionTy = PromotionType.isNull()
? getPromotionType(E->getSubExpr()->getType())
: PromotionType;
Value *result = VisitMinus(E, promotionTy);
if (result && !promotionTy.isNull())
result = EmitUnPromotedValue(result, E->getType());
return result;
}
Value *ScalarExprEmitter::VisitMinus(const UnaryOperator *E,
QualType PromotionType) {
TestAndClearIgnoreResultAssign();
Value *Op;
if (!PromotionType.isNull())
Op = CGF.EmitPromotedScalarExpr(E->getSubExpr(), PromotionType);
else
Op = Visit(E->getSubExpr());
// Generate a unary FNeg for FP ops.
if (Op->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, E);
return Builder.CreateFNeg(Op, "fneg");
}
// Emit unary minus with EmitSub so we handle overflow cases etc.
BinOpInfo BinOp;
BinOp.RHS = Op;
BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
BinOp.Ty = E->getType();
BinOp.Opcode = BO_Sub;
BinOp.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
BinOp.E = E;
return EmitSub(BinOp);
}
Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
TestAndClearIgnoreResultAssign();
Value *Op = Visit(E->getSubExpr());
return Builder.CreateNot(Op, "not");
}
Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
// Perform vector logical not on comparison with zero vector.
if (E->getType()->isVectorType() &&
E->getType()->castAs<VectorType>()->getVectorKind() ==
VectorKind::Generic) {
Value *Oper = Visit(E->getSubExpr());
Value *Zero = llvm::Constant::getNullValue(Oper->getType());
Value *Result;
if (Oper->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(
CGF, E->getFPFeaturesInEffect(CGF.getLangOpts()));
Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
} else
Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
}
// Compare operand to zero.
Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
// Invert value.
// TODO: Could dynamically modify easy computations here. For example, if
// the operand is an icmp ne, turn into icmp eq.
BoolVal = Builder.CreateNot(BoolVal, "lnot");
// ZExt result to the expr type.
return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
}
Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
// Try folding the offsetof to a constant.
Expr::EvalResult EVResult;
if (E->EvaluateAsInt(EVResult, CGF.getContext())) {
llvm::APSInt Value = EVResult.Val.getInt();
return Builder.getInt(Value);
}
// Loop over the components of the offsetof to compute the value.
unsigned n = E->getNumComponents();
llvm::Type* ResultType = ConvertType(E->getType());
llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
QualType CurrentType = E->getTypeSourceInfo()->getType();
for (unsigned i = 0; i != n; ++i) {
OffsetOfNode ON = E->getComponent(i);
llvm::Value *Offset = nullptr;
switch (ON.getKind()) {
case OffsetOfNode::Array: {
// Compute the index
Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
// Save the element type
CurrentType =
CGF.getContext().getAsArrayType(CurrentType)->getElementType();
// Compute the element size
llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
// Multiply out to compute the result
Offset = Builder.CreateMul(Idx, ElemSize);
break;
}
case OffsetOfNode::Field: {
FieldDecl *MemberDecl = ON.getField();
auto *RD = CurrentType->castAsRecordDecl();
const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
// Get the index of the field in its parent.
unsigned FieldIndex = MemberDecl->getFieldIndex();
// Compute the offset to the field
int64_t OffsetInt =
RL.getFieldOffset(FieldIndex) / CGF.getContext().getCharWidth();
Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
// Save the element type.
CurrentType = MemberDecl->getType();
break;
}
case OffsetOfNode::Identifier:
llvm_unreachable("dependent __builtin_offsetof");
case OffsetOfNode::Base: {
if (ON.getBase()->isVirtual()) {
CGF.ErrorUnsupported(E, "virtual base in offsetof");
continue;
}
const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(
CurrentType->castAsCanonical<RecordType>()->getDecl());
// Save the element type.
CurrentType = ON.getBase()->getType();
// Compute the offset to the base.
auto *BaseRD = CurrentType->castAsCXXRecordDecl();
CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
break;
}
}
Result = Builder.CreateAdd(Result, Offset);
}
return Result;
}
/// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
/// argument of the sizeof expression as an integer.
Value *
ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
const UnaryExprOrTypeTraitExpr *E) {
QualType TypeToSize = E->getTypeOfArgument();
if (auto Kind = E->getKind();
Kind == UETT_SizeOf || Kind == UETT_DataSizeOf || Kind == UETT_CountOf) {
if (const VariableArrayType *VAT =
CGF.getContext().getAsVariableArrayType(TypeToSize)) {
// For _Countof, we only want to evaluate if the extent is actually
// variable as opposed to a multi-dimensional array whose extent is
// constant but whose element type is variable.
bool EvaluateExtent = true;
if (Kind == UETT_CountOf && VAT->getElementType()->isArrayType()) {
EvaluateExtent =
!VAT->getSizeExpr()->isIntegerConstantExpr(CGF.getContext());
}
if (EvaluateExtent) {
if (E->isArgumentType()) {
// sizeof(type) - make sure to emit the VLA size.
CGF.EmitVariablyModifiedType(TypeToSize);
} else {
// C99 6.5.3.4p2: If the argument is an expression of type
// VLA, it is evaluated.
CGF.EmitIgnoredExpr(E->getArgumentExpr());
}
// For _Countof, we just want to return the size of a single dimension.
if (Kind == UETT_CountOf)
return CGF.getVLAElements1D(VAT).NumElts;
// For sizeof and __datasizeof, we need to scale the number of elements
// by the size of the array element type.
auto VlaSize = CGF.getVLASize(VAT);
// Scale the number of non-VLA elements by the non-VLA element size.
CharUnits eltSize = CGF.getContext().getTypeSizeInChars(VlaSize.Type);
if (!eltSize.isOne())
return CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize),
VlaSize.NumElts);
return VlaSize.NumElts;
}
}
} else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) {
auto Alignment =
CGF.getContext()
.toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign(
E->getTypeOfArgument()->getPointeeType()))
.getQuantity();
return llvm::ConstantInt::get(CGF.SizeTy, Alignment);
} else if (E->getKind() == UETT_VectorElements) {
auto *VecTy = cast<llvm::VectorType>(ConvertType(E->getTypeOfArgument()));
return Builder.CreateElementCount(CGF.SizeTy, VecTy->getElementCount());
}
// If this isn't sizeof(vla), the result must be constant; use the constant
// folding logic so we don't have to duplicate it here.
return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
}
Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E,
QualType PromotionType) {
QualType promotionTy = PromotionType.isNull()
? getPromotionType(E->getSubExpr()->getType())
: PromotionType;
Value *result = VisitReal(E, promotionTy);
if (result && !promotionTy.isNull())
result = EmitUnPromotedValue(result, E->getType());
return result;
}
Value *ScalarExprEmitter::VisitReal(const UnaryOperator *E,
QualType PromotionType) {
Expr *Op = E->getSubExpr();
if (Op->getType()->isAnyComplexType()) {
// If it's an l-value, load through the appropriate subobject l-value.
// Note that we have to ask E because Op might be an l-value that
// this won't work for, e.g. an Obj-C property.
if (E->isGLValue()) {
if (!PromotionType.isNull()) {
CodeGenFunction::ComplexPairTy result = CGF.EmitComplexExpr(
Op, /*IgnoreReal*/ IgnoreResultAssign, /*IgnoreImag*/ true);
PromotionType = PromotionType->isAnyComplexType()
? PromotionType
: CGF.getContext().getComplexType(PromotionType);
return result.first ? CGF.EmitPromotedValue(result, PromotionType).first
: result.first;
}
return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), E->getExprLoc())
.getScalarVal();
}
// Otherwise, calculate and project.
return CGF.EmitComplexExpr(Op, false, true).first;
}
if (!PromotionType.isNull())
return CGF.EmitPromotedScalarExpr(Op, PromotionType);
return Visit(Op);
}
Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E,
QualType PromotionType) {
QualType promotionTy = PromotionType.isNull()
? getPromotionType(E->getSubExpr()->getType())
: PromotionType;
Value *result = VisitImag(E, promotionTy);
if (result && !promotionTy.isNull())
result = EmitUnPromotedValue(result, E->getType());
return result;
}
Value *ScalarExprEmitter::VisitImag(const UnaryOperator *E,
QualType PromotionType) {
Expr *Op = E->getSubExpr();
if (Op->getType()->isAnyComplexType()) {
// If it's an l-value, load through the appropriate subobject l-value.
// Note that we have to ask E because Op might be an l-value that
// this won't work for, e.g. an Obj-C property.
if (Op->isGLValue()) {
if (!PromotionType.isNull()) {
CodeGenFunction::ComplexPairTy result = CGF.EmitComplexExpr(
Op, /*IgnoreReal*/ true, /*IgnoreImag*/ IgnoreResultAssign);
PromotionType = PromotionType->isAnyComplexType()
? PromotionType
: CGF.getContext().getComplexType(PromotionType);
return result.second
? CGF.EmitPromotedValue(result, PromotionType).second
: result.second;
}
return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), E->getExprLoc())
.getScalarVal();
}
// Otherwise, calculate and project.
return CGF.EmitComplexExpr(Op, true, false).second;
}
// __imag on a scalar returns zero. Emit the subexpr to ensure side
// effects are evaluated, but not the actual value.
if (Op->isGLValue())
CGF.EmitLValue(Op);
else if (!PromotionType.isNull())
CGF.EmitPromotedScalarExpr(Op, PromotionType);
else
CGF.EmitScalarExpr(Op, true);
if (!PromotionType.isNull())
return llvm::Constant::getNullValue(ConvertType(PromotionType));
return llvm::Constant::getNullValue(ConvertType(E->getType()));
}
//===----------------------------------------------------------------------===//
// Binary Operators
//===----------------------------------------------------------------------===//
Value *ScalarExprEmitter::EmitPromotedValue(Value *result,
QualType PromotionType) {
return CGF.Builder.CreateFPExt(result, ConvertType(PromotionType), "ext");
}
Value *ScalarExprEmitter::EmitUnPromotedValue(Value *result,
QualType ExprType) {
return CGF.Builder.CreateFPTrunc(result, ConvertType(ExprType), "unpromotion");
}
Value *ScalarExprEmitter::EmitPromoted(const Expr *E, QualType PromotionType) {
E = E->IgnoreParens();
if (auto BO = dyn_cast<BinaryOperator>(E)) {
switch (BO->getOpcode()) {
#define HANDLE_BINOP(OP) \
case BO_##OP: \
return Emit##OP(EmitBinOps(BO, PromotionType));
HANDLE_BINOP(Add)
HANDLE_BINOP(Sub)
HANDLE_BINOP(Mul)
HANDLE_BINOP(Div)
#undef HANDLE_BINOP
default:
break;
}
} else if (auto UO = dyn_cast<UnaryOperator>(E)) {
switch (UO->getOpcode()) {
case UO_Imag:
return VisitImag(UO, PromotionType);
case UO_Real:
return VisitReal(UO, PromotionType);
case UO_Minus:
return VisitMinus(UO, PromotionType);
case UO_Plus:
return VisitPlus(UO, PromotionType);
default:
break;
}
}
auto result = Visit(const_cast<Expr *>(E));
if (result) {
if (!PromotionType.isNull())
return EmitPromotedValue(result, PromotionType);
else
return EmitUnPromotedValue(result, E->getType());
}
return result;
}
BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E,
QualType PromotionType) {
TestAndClearIgnoreResultAssign();
BinOpInfo Result;
Result.LHS = CGF.EmitPromotedScalarExpr(E->getLHS(), PromotionType);
Result.RHS = CGF.EmitPromotedScalarExpr(E->getRHS(), PromotionType);
if (!PromotionType.isNull())
Result.Ty = PromotionType;
else
Result.Ty = E->getType();
Result.Opcode = E->getOpcode();
Result.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
Result.E = E;
return Result;
}
LValue ScalarExprEmitter::EmitCompoundAssignLValue(
const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
Value *&Result) {
QualType LHSTy = E->getLHS()->getType();
BinOpInfo OpInfo;
if (E->getComputationResultType()->isAnyComplexType())
return CGF.EmitScalarCompoundAssignWithComplex(E, Result);
// Emit the RHS first. __block variables need to have the rhs evaluated
// first, plus this should improve codegen a little.
QualType PromotionTypeCR;
PromotionTypeCR = getPromotionType(E->getComputationResultType());
if (PromotionTypeCR.isNull())
PromotionTypeCR = E->getComputationResultType();
QualType PromotionTypeLHS = getPromotionType(E->getComputationLHSType());
QualType PromotionTypeRHS = getPromotionType(E->getRHS()->getType());
if (!PromotionTypeRHS.isNull())
OpInfo.RHS = CGF.EmitPromotedScalarExpr(E->getRHS(), PromotionTypeRHS);
else
OpInfo.RHS = Visit(E->getRHS());
OpInfo.Ty = PromotionTypeCR;
OpInfo.Opcode = E->getOpcode();
OpInfo.FPFeatures = E->getFPFeaturesInEffect(CGF.getLangOpts());
OpInfo.E = E;
// Load/convert the LHS.
LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
llvm::PHINode *atomicPHI = nullptr;
if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
// Type wrapped by _Atomic.
QualType AtomicValueTy = atomicTy->getValueType();
// Type resulting from FP conversion / integer promotion of the compound
// assignment operands.
QualType ResultTy = E->getComputationResultType();
// Do not try the atomicrmw op fast-path when the compound assignment may
// involve FP conversions, as the correct semantics would require promoting
// the loaded integer to double, performing FP arithmetics, and truncation
// back as a single atomic operation. Integer promotion is still
// semantically safe.
bool CanEmitAtomicRMW;
if (AtomicValueTy->isFloatingType()) {
llvm::Type *IRTy = CGF.ConvertType(AtomicValueTy);
uint64_t StoreBits = CGF.CGM.getDataLayout().getTypeStoreSizeInBits(IRTy);
// Floating atomicrmw operations cannot model constrained FP semantics.
CanEmitAtomicRMW =
!OpInfo.FPFeatures.isFPConstrained() &&
CGF.getContext().hasSameUnqualifiedType(AtomicValueTy, ResultTy) &&
llvm::isPowerOf2_64(StoreBits);
} else {
CanEmitAtomicRMW =
!AtomicValueTy->isBooleanType() && AtomicValueTy->isIntegerType() &&
ResultTy->isIntegerType() &&
!(AtomicValueTy->isUnsignedIntegerType() &&
CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) &&
CGF.getLangOpts().getSignedOverflowBehavior() !=
LangOptions::SOB_Trapping;
}
if (CanEmitAtomicRMW) {
llvm::AtomicRMWInst::BinOp AtomicOp = llvm::AtomicRMWInst::BAD_BINOP;
llvm::Instruction::BinaryOps Op;
if (AtomicValueTy->isFloatingType()) {
switch (OpInfo.Opcode) {
case BO_AddAssign:
AtomicOp = llvm::AtomicRMWInst::FAdd;
Op = llvm::Instruction::FAdd;
break;
case BO_SubAssign:
AtomicOp = llvm::AtomicRMWInst::FSub;
Op = llvm::Instruction::FSub;
break;
default:
break;
}
} else {
switch (OpInfo.Opcode) {
// We don't have atomicrmw operands for *, %, /, <<, >>
case BO_MulAssign: case BO_DivAssign:
case BO_RemAssign:
case BO_ShlAssign:
case BO_ShrAssign:
break;
case BO_AddAssign:
AtomicOp = llvm::AtomicRMWInst::Add;
Op = llvm::Instruction::Add;
break;
case BO_SubAssign:
AtomicOp = llvm::AtomicRMWInst::Sub;
Op = llvm::Instruction::Sub;
break;
case BO_AndAssign:
AtomicOp = llvm::AtomicRMWInst::And;
Op = llvm::Instruction::And;
break;
case BO_XorAssign:
AtomicOp = llvm::AtomicRMWInst::Xor;
Op = llvm::Instruction::Xor;
break;
case BO_OrAssign:
AtomicOp = llvm::AtomicRMWInst::Or;
Op = llvm::Instruction::Or;
break;
default:
llvm_unreachable("Invalid compound assignment type");
}
}
if (AtomicOp != llvm::AtomicRMWInst::BAD_BINOP) {
llvm::Value *Amt = CGF.EmitToMemory(
EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy,
E->getExprLoc()),
LHSTy);
llvm::AtomicRMWInst *OldVal =
CGF.emitAtomicRMWInst(AtomicOp, LHSLV.getAddress(), Amt);
// Since operation is atomic, the result type is guaranteed to be the
// same as the input in LLVM terms.
Result = Builder.CreateBinOp(Op, OldVal, Amt);
return LHSLV;
}
}
// FIXME: For floating point types, we should be saving and restoring the
// floating point environment in the loop.
llvm::BasicBlock *startBB = Builder.GetInsertBlock();
llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, AtomicValueTy);
Builder.CreateBr(opBB);
Builder.SetInsertPoint(opBB);
atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
atomicPHI->addIncoming(OpInfo.LHS, startBB);
OpInfo.LHS = atomicPHI;
}
else
OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc());
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, OpInfo.FPFeatures);
SourceLocation Loc = E->getExprLoc();
if (!PromotionTypeLHS.isNull())
OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy, PromotionTypeLHS,
E->getExprLoc());
else
OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
E->getComputationLHSType(), Loc);
// Expand the binary operator.
Result = (this->*Func)(OpInfo);
// Convert the result back to the LHS type,
// potentially with Implicit Conversion sanitizer check.
// If LHSLV is a bitfield, use default ScalarConversionOpts
// to avoid emit any implicit integer checks.
Value *Previous = nullptr;
if (LHSLV.isBitField()) {
Previous = Result;
Result = EmitScalarConversion(Result, PromotionTypeCR, LHSTy, Loc);
} else if (const auto *atomicTy = LHSTy->getAs<AtomicType>()) {
Result =
EmitScalarConversion(Result, PromotionTypeCR, atomicTy->getValueType(),
Loc, ScalarConversionOpts(CGF.SanOpts));
} else {
Result = EmitScalarConversion(Result, PromotionTypeCR, LHSTy, Loc,
ScalarConversionOpts(CGF.SanOpts));
}
if (atomicPHI) {
llvm::BasicBlock *curBlock = Builder.GetInsertBlock();
llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
auto Pair = CGF.EmitAtomicCompareExchange(
LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc());
llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy);
llvm::Value *success = Pair.second;
atomicPHI->addIncoming(old, curBlock);
Builder.CreateCondBr(success, contBB, atomicPHI->getParent());
Builder.SetInsertPoint(contBB);
return LHSLV;
}
// Store the result value into the LHS lvalue. Bit-fields are handled
// specially because the result is altered by the store, i.e., [C99 6.5.16p1]
// 'An assignment expression has the value of the left operand after the
// assignment...'.
if (LHSLV.isBitField()) {
Value *Src = Previous ? Previous : Result;
QualType SrcType = E->getRHS()->getType();
QualType DstType = E->getLHS()->getType();
CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
CGF.EmitBitfieldConversionCheck(Src, SrcType, Result, DstType,
LHSLV.getBitFieldInfo(), E->getExprLoc());
} else
CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
if (CGF.getLangOpts().OpenMP)
CGF.CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(CGF,
E->getLHS());
return LHSLV;
}
Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
bool Ignore = TestAndClearIgnoreResultAssign();
Value *RHS = nullptr;
LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
// If the result is clearly ignored, return now.
if (Ignore)
return nullptr;
// The result of an assignment in C is the assigned r-value.
if (!CGF.getLangOpts().CPlusPlus)
return RHS;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LHS.isVolatileQualified())
return RHS;
// Otherwise, reload the value.
return EmitLoadOfLValue(LHS, E->getExprLoc());
}
void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
SmallVector<std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>, 2>
Checks;
if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) {
Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero),
SanitizerKind::SO_IntegerDivideByZero));
}
const auto *BO = cast<BinaryOperator>(Ops.E);
if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) &&
Ops.Ty->hasSignedIntegerRepresentation() &&
!IsWidenedIntegerOp(CGF.getContext(), BO->getLHS()) &&
Ops.mayHaveIntegerOverflow() &&
!CGF.getContext().isTypeIgnoredBySanitizer(
SanitizerKind::SignedIntegerOverflow, Ops.Ty)) {
llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
llvm::Value *IntMin =
Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
llvm::Value *NegOne = llvm::Constant::getAllOnesValue(Ty);
llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
Checks.push_back(
std::make_pair(NotOverflow, SanitizerKind::SO_SignedIntegerOverflow));
}
if (Checks.size() > 0)
EmitBinOpCheck(Checks, Ops);
}
Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
{
SanitizerDebugLocation SanScope(&CGF,
{SanitizerKind::SO_IntegerDivideByZero,
SanitizerKind::SO_SignedIntegerOverflow,
SanitizerKind::SO_FloatDivideByZero},
SanitizerHandler::DivremOverflow);
if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
Ops.Ty->isIntegerType() &&
(Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) {
llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
} else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) &&
Ops.Ty->isRealFloatingType() &&
Ops.mayHaveFloatDivisionByZero()) {
llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero);
EmitBinOpCheck(
std::make_pair(NonZero, SanitizerKind::SO_FloatDivideByZero), Ops);
}
}
if (Ops.Ty->isConstantMatrixType()) {
llvm::MatrixBuilder MB(Builder);
// We need to check the types of the operands of the operator to get the
// correct matrix dimensions.
auto *BO = cast<BinaryOperator>(Ops.E);
(void)BO;
assert(
isa<ConstantMatrixType>(BO->getLHS()->getType().getCanonicalType()) &&
"first operand must be a matrix");
assert(BO->getRHS()->getType().getCanonicalType()->isArithmeticType() &&
"second operand must be an arithmetic type");
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
return MB.CreateScalarDiv(Ops.LHS, Ops.RHS,
Ops.Ty->hasUnsignedIntegerRepresentation());
}
if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
llvm::Value *Val;
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, Ops.FPFeatures);
Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
CGF.SetDivFPAccuracy(Val);
return Val;
}
else if (Ops.isFixedPointOp())
return EmitFixedPointBinOp(Ops);
else if (Ops.Ty->hasUnsignedIntegerRepresentation())
return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
else
return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
}
Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
// Rem in C can't be a floating point type: C99 6.5.5p2.
if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) ||
CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) &&
Ops.Ty->isIntegerType() &&
(Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) {
SanitizerDebugLocation SanScope(&CGF,
{SanitizerKind::SO_IntegerDivideByZero,
SanitizerKind::SO_SignedIntegerOverflow},
SanitizerHandler::DivremOverflow);
llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
}
if (Ops.Ty->hasUnsignedIntegerRepresentation())
return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
if (CGF.getLangOpts().HLSL && Ops.Ty->hasFloatingRepresentation())
return Builder.CreateFRem(Ops.LHS, Ops.RHS, "rem");
return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
}
Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
unsigned IID;
unsigned OpID = 0;
SanitizerHandler OverflowKind;
bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
switch (Ops.Opcode) {
case BO_Add:
case BO_AddAssign:
OpID = 1;
IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
llvm::Intrinsic::uadd_with_overflow;
OverflowKind = SanitizerHandler::AddOverflow;
break;
case BO_Sub:
case BO_SubAssign:
OpID = 2;
IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
llvm::Intrinsic::usub_with_overflow;
OverflowKind = SanitizerHandler::SubOverflow;
break;
case BO_Mul:
case BO_MulAssign:
OpID = 3;
IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
llvm::Intrinsic::umul_with_overflow;
OverflowKind = SanitizerHandler::MulOverflow;
break;
default:
llvm_unreachable("Unsupported operation for overflow detection");
}
OpID <<= 1;
if (isSigned)
OpID |= 1;
SanitizerDebugLocation SanScope(&CGF,
{SanitizerKind::SO_SignedIntegerOverflow,
SanitizerKind::SO_UnsignedIntegerOverflow},
OverflowKind);
llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS});
Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
// Handle overflow with llvm.trap if no custom handler has been specified.
const std::string *handlerName =
&CGF.getLangOpts().OverflowHandler;
if (handlerName->empty()) {
// If no -ftrapv handler has been specified, try to use sanitizer runtimes
// if available otherwise just emit a trap. It is possible for unsigned
// arithmetic to result in a trap due to the OverflowBehaviorType attribute
// which describes overflow behavior on a per-type basis.
if (isSigned) {
if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) {
llvm::Value *NotOf = Builder.CreateNot(overflow);
EmitBinOpCheck(
std::make_pair(NotOf, SanitizerKind::SO_SignedIntegerOverflow),
Ops);
} else
CGF.EmitTrapCheck(Builder.CreateNot(overflow), OverflowKind);
return result;
}
if (CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) {
llvm::Value *NotOf = Builder.CreateNot(overflow);
EmitBinOpCheck(
std::make_pair(NotOf, SanitizerKind::SO_UnsignedIntegerOverflow),
Ops);
} else
CGF.EmitTrapCheck(Builder.CreateNot(overflow), OverflowKind);
return result;
}
// Branch in case of overflow.
llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
llvm::BasicBlock *continueBB =
CGF.createBasicBlock("nooverflow", CGF.CurFn, initialBB->getNextNode());
llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
Builder.CreateCondBr(overflow, overflowBB, continueBB);
// If an overflow handler is set, then we want to call it and then use its
// result, if it returns.
Builder.SetInsertPoint(overflowBB);
// Get the overflow handler.
llvm::Type *Int8Ty = CGF.Int8Ty;
llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
llvm::FunctionType *handlerTy =
llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
llvm::FunctionCallee handler =
CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
// Sign extend the args to 64-bit, so that we can use the same handler for
// all types of overflow.
llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
// Call the handler with the two arguments, the operation, and the size of
// the result.
llvm::Value *handlerArgs[] = {
lhs,
rhs,
Builder.getInt8(OpID),
Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
};
llvm::Value *handlerResult =
CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
// Truncate the result back to the desired size.
handlerResult = Builder.CreateTrunc(handlerResult, opTy);
Builder.CreateBr(continueBB);
Builder.SetInsertPoint(continueBB);
llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
phi->addIncoming(result, initialBB);
phi->addIncoming(handlerResult, overflowBB);
return phi;
}
/// BO_Add/BO_Sub are handled by EmitPointerWithAlignment to preserve alignment
/// information.
/// This function is used for BO_AddAssign/BO_SubAssign.
static Value *emitPointerArithmetic(CodeGenFunction &CGF, const BinOpInfo &op,
bool isSubtraction) {
// Must have binary (not unary) expr here. Unary pointer
// increment/decrement doesn't use this path.
const BinaryOperator *expr = cast<BinaryOperator>(op.E);
Value *pointer = op.LHS;
Expr *pointerOperand = expr->getLHS();
Value *index = op.RHS;
Expr *indexOperand = expr->getRHS();
// In a subtraction, the LHS is always the pointer.
if (!isSubtraction && !pointer->getType()->isPointerTy()) {
std::swap(pointer, index);
std::swap(pointerOperand, indexOperand);
}
return CGF.EmitPointerArithmetic(expr, pointerOperand, pointer, indexOperand,
index, isSubtraction);
}
/// Emit pointer + index arithmetic.
llvm::Value *CodeGenFunction::EmitPointerArithmetic(
const BinaryOperator *BO, Expr *pointerOperand, llvm::Value *pointer,
Expr *indexOperand, llvm::Value *index, bool isSubtraction) {
bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
auto &DL = CGM.getDataLayout();
auto *PtrTy = cast<llvm::PointerType>(pointer->getType());
// Some versions of glibc and gcc use idioms (particularly in their malloc
// routines) that add a pointer-sized integer (known to be a pointer value)
// to a null pointer in order to cast the value back to an integer or as
// part of a pointer alignment algorithm. This is undefined behavior, but
// we'd like to be able to compile programs that use it.
//
// Normally, we'd generate a GEP with a null-pointer base here in response
// to that code, but it's also UB to dereference a pointer created that
// way. Instead (as an acknowledged hack to tolerate the idiom) we will
// generate a direct cast of the integer value to a pointer.
//
// The idiom (p = nullptr + N) is not met if any of the following are true:
//
// The operation is subtraction.
// The index is not pointer-sized.
// The pointer type is not byte-sized.
//
// Note that we do not suppress the pointer overflow check in this case.
if (BinaryOperator::isNullPointerArithmeticExtension(
getContext(), BO->getOpcode(), pointerOperand, indexOperand)) {
llvm::Value *Ptr = Builder.CreateIntToPtr(index, pointer->getType());
if (getLangOpts().PointerOverflowDefined ||
!SanOpts.has(SanitizerKind::PointerOverflow) ||
NullPointerIsDefined(Builder.GetInsertBlock()->getParent(),
PtrTy->getPointerAddressSpace()))
return Ptr;
// The inbounds GEP of null is valid iff the index is zero.
auto CheckOrdinal = SanitizerKind::SO_PointerOverflow;
auto CheckHandler = SanitizerHandler::PointerOverflow;
SanitizerDebugLocation SanScope(this, {CheckOrdinal}, CheckHandler);
llvm::Value *IsZeroIndex = Builder.CreateIsNull(index);
llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(BO->getExprLoc())};
llvm::Type *IntPtrTy = DL.getIntPtrType(PtrTy);
llvm::Value *IntPtr = llvm::Constant::getNullValue(IntPtrTy);
llvm::Value *ComputedGEP = Builder.CreateZExtOrTrunc(index, IntPtrTy);
llvm::Value *DynamicArgs[] = {IntPtr, ComputedGEP};
EmitCheck({{IsZeroIndex, CheckOrdinal}}, CheckHandler, StaticArgs,
DynamicArgs);
return Ptr;
}
if (width != DL.getIndexTypeSizeInBits(PtrTy)) {
// Zero-extend or sign-extend the pointer value according to
// whether the index is signed or not.
index = Builder.CreateIntCast(index, DL.getIndexType(PtrTy), isSigned,
"idx.ext");
}
// If this is subtraction, negate the index.
if (isSubtraction)
index = Builder.CreateNeg(index, "idx.neg");
if (SanOpts.has(SanitizerKind::ArrayBounds))
EmitBoundsCheck(BO, pointerOperand, index, indexOperand->getType(),
/*Accessed*/ false);
const PointerType *pointerType =
pointerOperand->getType()->getAs<PointerType>();
if (!pointerType) {
QualType objectType = pointerOperand->getType()
->castAs<ObjCObjectPointerType>()
->getPointeeType();
llvm::Value *objectSize =
CGM.getSize(getContext().getTypeSizeInChars(objectType));
index = Builder.CreateMul(index, objectSize);
llvm::Value *result = Builder.CreateGEP(Int8Ty, pointer, index, "add.ptr");
return Builder.CreateBitCast(result, pointer->getType());
}
QualType elementType = pointerType->getPointeeType();
if (const VariableArrayType *vla =
getContext().getAsVariableArrayType(elementType)) {
// The element count here is the total number of non-VLA elements.
llvm::Value *numElements = getVLASize(vla).NumElts;
// Effectively, the multiply by the VLA size is part of the GEP.
// GEP indexes are signed, and scaling an index isn't permitted to
// signed-overflow, so we use the same semantics for our explicit
// multiply. We suppress this if overflow is not undefined behavior.
llvm::Type *elemTy = ConvertTypeForMem(vla->getElementType());
if (getLangOpts().PointerOverflowDefined) {
index = Builder.CreateMul(index, numElements, "vla.index");
pointer = Builder.CreateGEP(elemTy, pointer, index, "add.ptr");
} else {
index = Builder.CreateNSWMul(index, numElements, "vla.index");
pointer =
EmitCheckedInBoundsGEP(elemTy, pointer, index, isSigned,
isSubtraction, BO->getExprLoc(), "add.ptr");
}
return pointer;
}
// Explicitly handle GNU void* and function pointer arithmetic extensions. The
// GNU void* casts amount to no-ops since our void* type is i8*, but this is
// future proof.
llvm::Type *elemTy;
if (elementType->isVoidType() || elementType->isFunctionType())
elemTy = Int8Ty;
else
elemTy = ConvertTypeForMem(elementType);
if (getLangOpts().PointerOverflowDefined)
return Builder.CreateGEP(elemTy, pointer, index, "add.ptr");
return EmitCheckedInBoundsGEP(elemTy, pointer, index, isSigned, isSubtraction,
BO->getExprLoc(), "add.ptr");
}
// Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
// Addend. Use negMul and negAdd to negate the first operand of the Mul or
// the add operand respectively. This allows fmuladd to represent a*b-c, or
// c-a*b. Patterns in LLVM should catch the negated forms and translate them to
// efficient operations.
static Value* buildFMulAdd(llvm::Instruction *MulOp, Value *Addend,
const CodeGenFunction &CGF, CGBuilderTy &Builder,
bool negMul, bool negAdd) {
Value *MulOp0 = MulOp->getOperand(0);
Value *MulOp1 = MulOp->getOperand(1);
if (negMul)
MulOp0 = Builder.CreateFNeg(MulOp0, "neg");
if (negAdd)
Addend = Builder.CreateFNeg(Addend, "neg");
Value *FMulAdd = nullptr;
if (Builder.getIsFPConstrained()) {
assert(isa<llvm::ConstrainedFPIntrinsic>(MulOp) &&
"Only constrained operation should be created when Builder is in FP "
"constrained mode");
FMulAdd = Builder.CreateConstrainedFPCall(
CGF.CGM.getIntrinsic(llvm::Intrinsic::experimental_constrained_fmuladd,
Addend->getType()),
{MulOp0, MulOp1, Addend});
} else {
FMulAdd = Builder.CreateCall(
CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
{MulOp0, MulOp1, Addend});
}
MulOp->eraseFromParent();
return FMulAdd;
}
// Check whether it would be legal to emit an fmuladd intrinsic call to
// represent op and if so, build the fmuladd.
//
// Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
// Does NOT check the type of the operation - it's assumed that this function
// will be called from contexts where it's known that the type is contractable.
static Value* tryEmitFMulAdd(const BinOpInfo &op,
const CodeGenFunction &CGF, CGBuilderTy &Builder,
bool isSub=false) {
assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
"Only fadd/fsub can be the root of an fmuladd.");
// Check whether this op is marked as fusable.
if (!op.FPFeatures.allowFPContractWithinStatement())
return nullptr;
Value *LHS = op.LHS;
Value *RHS = op.RHS;
// Peek through fneg to look for fmul. Make sure fneg has no users, and that
// it is the only use of its operand.
bool NegLHS = false;
if (auto *LHSUnOp = dyn_cast<llvm::UnaryOperator>(LHS)) {
if (LHSUnOp->getOpcode() == llvm::Instruction::FNeg &&
LHSUnOp->use_empty() && LHSUnOp->getOperand(0)->hasOneUse()) {
LHS = LHSUnOp->getOperand(0);
NegLHS = true;
}
}
bool NegRHS = false;
if (auto *RHSUnOp = dyn_cast<llvm::UnaryOperator>(RHS)) {
if (RHSUnOp->getOpcode() == llvm::Instruction::FNeg &&
RHSUnOp->use_empty() && RHSUnOp->getOperand(0)->hasOneUse()) {
RHS = RHSUnOp->getOperand(0);
NegRHS = true;
}
}
// We have a potentially fusable op. Look for a mul on one of the operands.
// Also, make sure that the mul result isn't used directly. In that case,
// there's no point creating a muladd operation.
if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(LHS)) {
if (LHSBinOp->getOpcode() == llvm::Instruction::FMul &&
(LHSBinOp->use_empty() || NegLHS)) {
// If we looked through fneg, erase it.
if (NegLHS)
cast<llvm::Instruction>(op.LHS)->eraseFromParent();
return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, NegLHS, isSub);
}
}
if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(RHS)) {
if (RHSBinOp->getOpcode() == llvm::Instruction::FMul &&
(RHSBinOp->use_empty() || NegRHS)) {
// If we looked through fneg, erase it.
if (NegRHS)
cast<llvm::Instruction>(op.RHS)->eraseFromParent();
return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub ^ NegRHS, false);
}
}
if (auto *LHSBinOp = dyn_cast<llvm::CallBase>(LHS)) {
if (LHSBinOp->getIntrinsicID() ==
llvm::Intrinsic::experimental_constrained_fmul &&
(LHSBinOp->use_empty() || NegLHS)) {
// If we looked through fneg, erase it.
if (NegLHS)
cast<llvm::Instruction>(op.LHS)->eraseFromParent();
return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, NegLHS, isSub);
}
}
if (auto *RHSBinOp = dyn_cast<llvm::CallBase>(RHS)) {
if (RHSBinOp->getIntrinsicID() ==
llvm::Intrinsic::experimental_constrained_fmul &&
(RHSBinOp->use_empty() || NegRHS)) {
// If we looked through fneg, erase it.
if (NegRHS)
cast<llvm::Instruction>(op.RHS)->eraseFromParent();
return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub ^ NegRHS, false);
}
}
return nullptr;
}
Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
if (op.LHS->getType()->isPointerTy() ||
op.RHS->getType()->isPointerTy())
return emitPointerArithmetic(CGF, op, CodeGenFunction::NotSubtraction);
if (op.Ty->isSignedIntegerOrEnumerationType() ||
op.Ty->isUnsignedIntegerType()) {
const bool isSigned = op.Ty->isSignedIntegerOrEnumerationType();
const bool hasSan =
isSigned ? CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)
: CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow);
switch (getOverflowBehaviorConsideringType(CGF, op.Ty)) {
case LangOptions::OB_Wrap:
return Builder.CreateAdd(op.LHS, op.RHS, "add");
case LangOptions::OB_SignedAndDefined:
if (!hasSan)
return Builder.CreateAdd(op.LHS, op.RHS, "add");
[[fallthrough]];
case LangOptions::OB_Unset:
if (!hasSan)
return isSigned ? Builder.CreateNSWAdd(op.LHS, op.RHS, "add")
: Builder.CreateAdd(op.LHS, op.RHS, "add");
[[fallthrough]];
case LangOptions::OB_Trap:
if (CanElideOverflowCheck(CGF.getContext(), op))
return isSigned ? Builder.CreateNSWAdd(op.LHS, op.RHS, "add")
: Builder.CreateAdd(op.LHS, op.RHS, "add");
return EmitOverflowCheckedBinOp(op);
}
}
// For vector and matrix adds, try to fold into a fmuladd.
if (op.LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
// Try to form an fmuladd.
if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
return FMulAdd;
}
if (op.Ty->isConstantMatrixType()) {
llvm::MatrixBuilder MB(Builder);
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
return MB.CreateAdd(op.LHS, op.RHS);
}
if (op.LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
return Builder.CreateFAdd(op.LHS, op.RHS, "add");
}
if (op.isFixedPointOp())
return EmitFixedPointBinOp(op);
return Builder.CreateAdd(op.LHS, op.RHS, "add");
}
/// The resulting value must be calculated with exact precision, so the operands
/// may not be the same type.
Value *ScalarExprEmitter::EmitFixedPointBinOp(const BinOpInfo &op) {
using llvm::APSInt;
using llvm::ConstantInt;
// This is either a binary operation where at least one of the operands is
// a fixed-point type, or a unary operation where the operand is a fixed-point
// type. The result type of a binary operation is determined by
// Sema::handleFixedPointConversions().
QualType ResultTy = op.Ty;
QualType LHSTy, RHSTy;
if (const auto *BinOp = dyn_cast<BinaryOperator>(op.E)) {
RHSTy = BinOp->getRHS()->getType();
if (const auto *CAO = dyn_cast<CompoundAssignOperator>(BinOp)) {
// For compound assignment, the effective type of the LHS at this point
// is the computation LHS type, not the actual LHS type, and the final
// result type is not the type of the expression but rather the
// computation result type.
LHSTy = CAO->getComputationLHSType();
ResultTy = CAO->getComputationResultType();
} else
LHSTy = BinOp->getLHS()->getType();
} else if (const auto *UnOp = dyn_cast<UnaryOperator>(op.E)) {
LHSTy = UnOp->getSubExpr()->getType();
RHSTy = UnOp->getSubExpr()->getType();
}
ASTContext &Ctx = CGF.getContext();
Value *LHS = op.LHS;
Value *RHS = op.RHS;
auto LHSFixedSema = Ctx.getFixedPointSemantics(LHSTy);
auto RHSFixedSema = Ctx.getFixedPointSemantics(RHSTy);
auto ResultFixedSema = Ctx.getFixedPointSemantics(ResultTy);
auto CommonFixedSema = LHSFixedSema.getCommonSemantics(RHSFixedSema);
// Perform the actual operation.
Value *Result;
llvm::FixedPointBuilder<CGBuilderTy> FPBuilder(Builder);
switch (op.Opcode) {
case BO_AddAssign:
case BO_Add:
Result = FPBuilder.CreateAdd(LHS, LHSFixedSema, RHS, RHSFixedSema);
break;
case BO_SubAssign:
case BO_Sub:
Result = FPBuilder.CreateSub(LHS, LHSFixedSema, RHS, RHSFixedSema);
break;
case BO_MulAssign:
case BO_Mul:
Result = FPBuilder.CreateMul(LHS, LHSFixedSema, RHS, RHSFixedSema);
break;
case BO_DivAssign:
case BO_Div:
Result = FPBuilder.CreateDiv(LHS, LHSFixedSema, RHS, RHSFixedSema);
break;
case BO_ShlAssign:
case BO_Shl:
Result = FPBuilder.CreateShl(LHS, LHSFixedSema, RHS);
break;
case BO_ShrAssign:
case BO_Shr:
Result = FPBuilder.CreateShr(LHS, LHSFixedSema, RHS);
break;
case BO_LT:
return FPBuilder.CreateLT(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_GT:
return FPBuilder.CreateGT(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_LE:
return FPBuilder.CreateLE(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_GE:
return FPBuilder.CreateGE(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_EQ:
// For equality operations, we assume any padding bits on unsigned types are
// zero'd out. They could be overwritten through non-saturating operations
// that cause overflow, but this leads to undefined behavior.
return FPBuilder.CreateEQ(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_NE:
return FPBuilder.CreateNE(LHS, LHSFixedSema, RHS, RHSFixedSema);
case BO_Cmp:
case BO_LAnd:
case BO_LOr:
llvm_unreachable("Found unimplemented fixed point binary operation");
case BO_PtrMemD:
case BO_PtrMemI:
case BO_Rem:
case BO_Xor:
case BO_And:
case BO_Or:
case BO_Assign:
case BO_RemAssign:
case BO_AndAssign:
case BO_XorAssign:
case BO_OrAssign:
case BO_Comma:
llvm_unreachable("Found unsupported binary operation for fixed point types.");
}
bool IsShift = BinaryOperator::isShiftOp(op.Opcode) ||
BinaryOperator::isShiftAssignOp(op.Opcode);
// Convert to the result type.
return FPBuilder.CreateFixedToFixed(Result, IsShift ? LHSFixedSema
: CommonFixedSema,
ResultFixedSema);
}
Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
// The LHS is always a pointer if either side is.
if (!op.LHS->getType()->isPointerTy()) {
if (op.Ty->isSignedIntegerOrEnumerationType() ||
op.Ty->isUnsignedIntegerType()) {
const bool isSigned = op.Ty->isSignedIntegerOrEnumerationType();
const bool hasSan =
isSigned ? CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)
: CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow);
switch (getOverflowBehaviorConsideringType(CGF, op.Ty)) {
case LangOptions::OB_Wrap:
return Builder.CreateSub(op.LHS, op.RHS, "sub");
case LangOptions::OB_SignedAndDefined:
if (!hasSan)
return Builder.CreateSub(op.LHS, op.RHS, "sub");
[[fallthrough]];
case LangOptions::OB_Unset:
if (!hasSan)
return isSigned ? Builder.CreateNSWSub(op.LHS, op.RHS, "sub")
: Builder.CreateSub(op.LHS, op.RHS, "sub");
[[fallthrough]];
case LangOptions::OB_Trap:
if (CanElideOverflowCheck(CGF.getContext(), op))
return isSigned ? Builder.CreateNSWSub(op.LHS, op.RHS, "sub")
: Builder.CreateSub(op.LHS, op.RHS, "sub");
return EmitOverflowCheckedBinOp(op);
}
}
// For vector and matrix subs, try to fold into a fmuladd.
if (op.LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
// Try to form an fmuladd.
if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
return FMulAdd;
}
if (op.Ty->isConstantMatrixType()) {
llvm::MatrixBuilder MB(Builder);
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
return MB.CreateSub(op.LHS, op.RHS);
}
if (op.LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, op.FPFeatures);
return Builder.CreateFSub(op.LHS, op.RHS, "sub");
}
if (op.isFixedPointOp())
return EmitFixedPointBinOp(op);
return Builder.CreateSub(op.LHS, op.RHS, "sub");
}
// If the RHS is not a pointer, then we have normal pointer
// arithmetic.
if (!op.RHS->getType()->isPointerTy())
return emitPointerArithmetic(CGF, op, CodeGenFunction::IsSubtraction);
// Otherwise, this is a pointer subtraction.
// Do the raw subtraction part. When pointer overflow is defined, use ptrtoint
// as the pointer difference can be used to obtain the pointer without basing
// it on one of the pointers (e.g. via -(nullptr - ptr)).
Value *LHS, *RHS;
if (CGF.getLangOpts().PointerOverflowDefined) {
LHS = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
RHS = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
} else {
LHS = Builder.CreatePtrToAddr(op.LHS, "sub.ptr.lhs.cast");
RHS = Builder.CreatePtrToAddr(op.RHS, "sub.ptr.rhs.cast");
if (LHS->getType() != CGF.PtrDiffTy)
LHS = Builder.CreateZExtOrTrunc(LHS, CGF.PtrDiffTy, "sub.ptr.lhs.ext");
if (RHS->getType() != CGF.PtrDiffTy)
RHS = Builder.CreateZExtOrTrunc(RHS, CGF.PtrDiffTy, "sub.ptr.lhs.ext");
}
Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
// Okay, figure out the element size.
const BinaryOperator *expr = cast<BinaryOperator>(op.E);
QualType elementType = expr->getLHS()->getType()->getPointeeType();
llvm::Value *divisor = nullptr;
// For a variable-length array, this is going to be non-constant.
if (const VariableArrayType *vla
= CGF.getContext().getAsVariableArrayType(elementType)) {
auto VlaSize = CGF.getVLASize(vla);
elementType = VlaSize.Type;
divisor = VlaSize.NumElts;
// Scale the number of non-VLA elements by the non-VLA element size.
CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
if (!eltSize.isOne())
divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
// For everything elese, we can just compute it, safe in the
// assumption that Sema won't let anything through that we can't
// safely compute the size of.
} else {
CharUnits elementSize;
// Handle GCC extension for pointer arithmetic on void* and
// function pointer types.
if (elementType->isVoidType() || elementType->isFunctionType())
elementSize = CharUnits::One();
else
elementSize = CGF.getContext().getTypeSizeInChars(elementType);
// Don't even emit the divide for element size of 1.
if (elementSize.isOne())
return diffInChars;
divisor = CGF.CGM.getSize(elementSize);
}
if (CGF.getLangOpts().StablePointerSubtraction)
return Builder.CreateSDiv(diffInChars, divisor, "sub.ptr.div");
// Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
// pointer difference in C is only defined in the case where both operands
// are pointing to elements of an array.
return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
}
Value *ScalarExprEmitter::GetMaximumShiftAmount(Value *LHS, Value *RHS,
bool RHSIsSigned) {
llvm::IntegerType *Ty;
if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
Ty = cast<llvm::IntegerType>(VT->getElementType());
else
Ty = cast<llvm::IntegerType>(LHS->getType());
// For a given type of LHS the maximum shift amount is width(LHS)-1, however
// it can occur that width(LHS)-1 > range(RHS). Since there is no check for
// this in ConstantInt::get, this results in the value getting truncated.
// Constrain the return value to be max(RHS) in this case.
llvm::Type *RHSTy = RHS->getType();
llvm::APInt RHSMax =
RHSIsSigned ? llvm::APInt::getSignedMaxValue(RHSTy->getScalarSizeInBits())
: llvm::APInt::getMaxValue(RHSTy->getScalarSizeInBits());
if (RHSMax.ult(Ty->getBitWidth()))
return llvm::ConstantInt::get(RHSTy, RHSMax);
return llvm::ConstantInt::get(RHSTy, Ty->getBitWidth() - 1);
}
Value *ScalarExprEmitter::ConstrainShiftValue(Value *LHS, Value *RHS,
const Twine &Name) {
llvm::IntegerType *Ty;
if (auto *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
Ty = cast<llvm::IntegerType>(VT->getElementType());
else
Ty = cast<llvm::IntegerType>(LHS->getType());
if (llvm::isPowerOf2_64(Ty->getBitWidth()))
return Builder.CreateAnd(RHS, GetMaximumShiftAmount(LHS, RHS, false), Name);
return Builder.CreateURem(
RHS, llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth()), Name);
}
Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
// TODO: This misses out on the sanitizer check below.
if (Ops.isFixedPointOp())
return EmitFixedPointBinOp(Ops);
// LLVM requires the LHS and RHS to be the same type: promote or truncate the
// RHS to the same size as the LHS.
Value *RHS = Ops.RHS;
if (Ops.LHS->getType() != RHS->getType())
RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
bool SanitizeSignedBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) &&
Ops.Ty->hasSignedIntegerRepresentation() &&
!CGF.getLangOpts().isSignedOverflowDefined() &&
!CGF.getLangOpts().CPlusPlus20;
bool SanitizeUnsignedBase =
CGF.SanOpts.has(SanitizerKind::UnsignedShiftBase) &&
Ops.Ty->hasUnsignedIntegerRepresentation();
bool SanitizeBase = SanitizeSignedBase || SanitizeUnsignedBase;
bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent);
// OpenCL 6.3j: shift values are effectively % word size of LHS.
if (CGF.getLangOpts().OpenCL || CGF.getLangOpts().HLSL)
RHS = ConstrainShiftValue(Ops.LHS, RHS, "shl.mask");
else if ((SanitizeBase || SanitizeExponent) &&
isa<llvm::IntegerType>(Ops.LHS->getType())) {
SmallVector<SanitizerKind::SanitizerOrdinal, 3> Ordinals;
if (SanitizeSignedBase)
Ordinals.push_back(SanitizerKind::SO_ShiftBase);
if (SanitizeUnsignedBase)
Ordinals.push_back(SanitizerKind::SO_UnsignedShiftBase);
if (SanitizeExponent)
Ordinals.push_back(SanitizerKind::SO_ShiftExponent);
SanitizerDebugLocation SanScope(&CGF, Ordinals,
SanitizerHandler::ShiftOutOfBounds);
SmallVector<std::pair<Value *, SanitizerKind::SanitizerOrdinal>, 2> Checks;
bool RHSIsSigned = Ops.rhsHasSignedIntegerRepresentation();
llvm::Value *WidthMinusOne =
GetMaximumShiftAmount(Ops.LHS, Ops.RHS, RHSIsSigned);
llvm::Value *ValidExponent = Builder.CreateICmpULE(Ops.RHS, WidthMinusOne);
if (SanitizeExponent) {
Checks.push_back(
std::make_pair(ValidExponent, SanitizerKind::SO_ShiftExponent));
}
if (SanitizeBase) {
// Check whether we are shifting any non-zero bits off the top of the
// integer. We only emit this check if exponent is valid - otherwise
// instructions below will have undefined behavior themselves.
llvm::BasicBlock *Orig = Builder.GetInsertBlock();
llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check");
Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont);
llvm::Value *PromotedWidthMinusOne =
(RHS == Ops.RHS) ? WidthMinusOne
: GetMaximumShiftAmount(Ops.LHS, RHS, RHSIsSigned);
CGF.EmitBlock(CheckShiftBase);
llvm::Value *BitsShiftedOff = Builder.CreateLShr(
Ops.LHS, Builder.CreateSub(PromotedWidthMinusOne, RHS, "shl.zeros",
/*NUW*/ true, /*NSW*/ true),
"shl.check");
if (SanitizeUnsignedBase || CGF.getLangOpts().CPlusPlus) {
// In C99, we are not permitted to shift a 1 bit into the sign bit.
// Under C++11's rules, shifting a 1 bit into the sign bit is
// OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
// define signed left shifts, so we use the C99 and C++11 rules there).
// Unsigned shifts can always shift into the top bit.
llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
}
llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
CGF.EmitBlock(Cont);
llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2);
BaseCheck->addIncoming(Builder.getTrue(), Orig);
BaseCheck->addIncoming(ValidBase, CheckShiftBase);
Checks.push_back(std::make_pair(
BaseCheck, SanitizeSignedBase ? SanitizerKind::SO_ShiftBase
: SanitizerKind::SO_UnsignedShiftBase));
}
assert(!Checks.empty());
EmitBinOpCheck(Checks, Ops);
}
return Builder.CreateShl(Ops.LHS, RHS, "shl");
}
Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
// TODO: This misses out on the sanitizer check below.
if (Ops.isFixedPointOp())
return EmitFixedPointBinOp(Ops);
// LLVM requires the LHS and RHS to be the same type: promote or truncate the
// RHS to the same size as the LHS.
Value *RHS = Ops.RHS;
if (Ops.LHS->getType() != RHS->getType())
RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
// OpenCL 6.3j: shift values are effectively % word size of LHS.
if (CGF.getLangOpts().OpenCL || CGF.getLangOpts().HLSL)
RHS = ConstrainShiftValue(Ops.LHS, RHS, "shr.mask");
else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) &&
isa<llvm::IntegerType>(Ops.LHS->getType())) {
SanitizerDebugLocation SanScope(&CGF, {SanitizerKind::SO_ShiftExponent},
SanitizerHandler::ShiftOutOfBounds);
bool RHSIsSigned = Ops.rhsHasSignedIntegerRepresentation();
llvm::Value *Valid = Builder.CreateICmpULE(
Ops.RHS, GetMaximumShiftAmount(Ops.LHS, Ops.RHS, RHSIsSigned));
EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::SO_ShiftExponent), Ops);
}
if (Ops.Ty->hasUnsignedIntegerRepresentation())
return Builder.CreateLShr(Ops.LHS, RHS, "shr");
return Builder.CreateAShr(Ops.LHS, RHS, "shr");
}
enum IntrinsicType { VCMPEQ, VCMPGT };
// return corresponding comparison intrinsic for given vector type
static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
BuiltinType::Kind ElemKind) {
switch (ElemKind) {
default: llvm_unreachable("unexpected element type");
case BuiltinType::Char_U:
case BuiltinType::UChar:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
case BuiltinType::Char_S:
case BuiltinType::SChar:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
case BuiltinType::UShort:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
case BuiltinType::Short:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
case BuiltinType::UInt:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
case BuiltinType::Int:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
case BuiltinType::ULong:
case BuiltinType::ULongLong:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p :
llvm::Intrinsic::ppc_altivec_vcmpgtud_p;
case BuiltinType::Long:
case BuiltinType::LongLong:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p :
llvm::Intrinsic::ppc_altivec_vcmpgtsd_p;
case BuiltinType::Float:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
case BuiltinType::Double:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_vsx_xvcmpeqdp_p :
llvm::Intrinsic::ppc_vsx_xvcmpgtdp_p;
case BuiltinType::UInt128:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequq_p
: llvm::Intrinsic::ppc_altivec_vcmpgtuq_p;
case BuiltinType::Int128:
return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequq_p
: llvm::Intrinsic::ppc_altivec_vcmpgtsq_p;
}
}
Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,
llvm::CmpInst::Predicate UICmpOpc,
llvm::CmpInst::Predicate SICmpOpc,
llvm::CmpInst::Predicate FCmpOpc,
bool IsSignaling) {
TestAndClearIgnoreResultAssign();
Value *Result;
QualType LHSTy = E->getLHS()->getType();
QualType RHSTy = E->getRHS()->getType();
if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
assert(E->getOpcode() == BO_EQ ||
E->getOpcode() == BO_NE);
Value *LHS = CGF.EmitScalarExpr(E->getLHS());
Value *RHS = CGF.EmitScalarExpr(E->getRHS());
Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
} else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) {
BinOpInfo BOInfo = EmitBinOps(E);
Value *LHS = BOInfo.LHS;
Value *RHS = BOInfo.RHS;
// If AltiVec, the comparison results in a numeric type, so we use
// intrinsics comparing vectors and giving 0 or 1 as a result
if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
// constants for mapping CR6 register bits to predicate result
enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
// in several cases vector arguments order will be reversed
Value *FirstVecArg = LHS,
*SecondVecArg = RHS;
QualType ElTy = LHSTy->castAs<VectorType>()->getElementType();
BuiltinType::Kind ElementKind = ElTy->castAs<BuiltinType>()->getKind();
switch(E->getOpcode()) {
default: llvm_unreachable("is not a comparison operation");
case BO_EQ:
CR6 = CR6_LT;
ID = GetIntrinsic(VCMPEQ, ElementKind);
break;
case BO_NE:
CR6 = CR6_EQ;
ID = GetIntrinsic(VCMPEQ, ElementKind);
break;
case BO_LT:
CR6 = CR6_LT;
ID = GetIntrinsic(VCMPGT, ElementKind);
std::swap(FirstVecArg, SecondVecArg);
break;
case BO_GT:
CR6 = CR6_LT;
ID = GetIntrinsic(VCMPGT, ElementKind);
break;
case BO_LE:
if (ElementKind == BuiltinType::Float) {
CR6 = CR6_LT;
ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
std::swap(FirstVecArg, SecondVecArg);
}
else {
CR6 = CR6_EQ;
ID = GetIntrinsic(VCMPGT, ElementKind);
}
break;
case BO_GE:
if (ElementKind == BuiltinType::Float) {
CR6 = CR6_LT;
ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
}
else {
CR6 = CR6_EQ;
ID = GetIntrinsic(VCMPGT, ElementKind);
std::swap(FirstVecArg, SecondVecArg);
}
break;
}
Value *CR6Param = Builder.getInt32(CR6);
llvm::Function *F = CGF.CGM.getIntrinsic(ID);
Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg});
// The result type of intrinsic may not be same as E->getType().
// If E->getType() is not BoolTy, EmitScalarConversion will do the
// conversion work. If E->getType() is BoolTy, EmitScalarConversion will
// do nothing, if ResultTy is not i1 at the same time, it will cause
// crash later.
llvm::IntegerType *ResultTy = cast<llvm::IntegerType>(Result->getType());
if (ResultTy->getBitWidth() > 1 &&
E->getType() == CGF.getContext().BoolTy)
Result = Builder.CreateTrunc(Result, Builder.getInt1Ty());
return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
E->getExprLoc());
}
if (BOInfo.isFixedPointOp()) {
Result = EmitFixedPointBinOp(BOInfo);
} else if (LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(CGF, BOInfo.FPFeatures);
if (!IsSignaling)
Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp");
else
Result = Builder.CreateFCmpS(FCmpOpc, LHS, RHS, "cmp");
} else if (LHSTy->hasSignedIntegerRepresentation()) {
Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp");
} else {
// Unsigned integers and pointers.
Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp");
}
// If this is a vector comparison, sign extend the result to the appropriate
// vector integer type and return it (don't convert to bool).
if (LHSTy->isVectorType() || LHSTy->isSveVLSBuiltinType())
return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
if (LHSTy->isMatrixType())
return Result;
} else {
// Complex Comparison: can only be an equality comparison.
CodeGenFunction::ComplexPairTy LHS, RHS;
QualType CETy;
if (auto *CTy = LHSTy->getAs<ComplexType>()) {
LHS = CGF.EmitComplexExpr(E->getLHS());
CETy = CTy->getElementType();
} else {
LHS.first = Visit(E->getLHS());
LHS.second = llvm::Constant::getNullValue(LHS.first->getType());
CETy = LHSTy;
}
if (auto *CTy = RHSTy->getAs<ComplexType>()) {
RHS = CGF.EmitComplexExpr(E->getRHS());
assert(CGF.getContext().hasSameUnqualifiedType(CETy,
CTy->getElementType()) &&
"The element types must always match.");
(void)CTy;
} else {
RHS.first = Visit(E->getRHS());
RHS.second = llvm::Constant::getNullValue(RHS.first->getType());
assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&
"The element types must always match.");
}
Value *ResultR, *ResultI;
if (CETy->isRealFloatingType()) {
// As complex comparisons can only be equality comparisons, they
// are never signaling comparisons.
ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r");
ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i");
} else {
// Complex comparisons can only be equality comparisons. As such, signed
// and unsigned opcodes are the same.
ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r");
ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i");
}
if (E->getOpcode() == BO_EQ) {
Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
} else {
assert(E->getOpcode() == BO_NE &&
"Complex comparison other than == or != ?");
Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
}
}
return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(),
E->getExprLoc());
}
llvm::Value *CodeGenFunction::EmitWithOriginalRHSBitfieldAssignment(
const BinaryOperator *E, Value **Previous, QualType *SrcType) {
// In case we have the integer or bitfield sanitizer checks enabled
// we want to get the expression before scalar conversion.
if (auto *ICE = dyn_cast<ImplicitCastExpr>(E->getRHS())) {
CastKind Kind = ICE->getCastKind();
if (Kind == CK_IntegralCast || Kind == CK_LValueToRValue) {
*SrcType = ICE->getSubExpr()->getType();
*Previous = EmitScalarExpr(ICE->getSubExpr());
// Pass default ScalarConversionOpts to avoid emitting
// integer sanitizer checks as E refers to bitfield.
return EmitScalarConversion(*Previous, *SrcType, ICE->getType(),
ICE->getExprLoc());
}
}
return EmitScalarExpr(E->getRHS());
}
Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
ApplyAtomGroup Grp(CGF.getDebugInfo());
bool Ignore = TestAndClearIgnoreResultAssign();
Value *RHS;
LValue LHS;
if (PointerAuthQualifier PtrAuth = E->getLHS()->getType().getPointerAuth()) {
LValue LV = CGF.EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
LV.getQuals().removePointerAuth();
llvm::Value *RV =
CGF.EmitPointerAuthQualify(PtrAuth, E->getRHS(), LV.getAddress());
CGF.EmitNullabilityCheck(LV, RV, E->getExprLoc());
CGF.EmitStoreThroughLValue(RValue::get(RV), LV);
if (Ignore)
return nullptr;
RV = CGF.EmitPointerAuthUnqualify(PtrAuth, RV, LV.getType(),
LV.getAddress(), /*nonnull*/ false);
return RV;
}
switch (E->getLHS()->getType().getObjCLifetime()) {
case Qualifiers::OCL_Strong:
std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
break;
case Qualifiers::OCL_Autoreleasing:
std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E);
break;
case Qualifiers::OCL_ExplicitNone:
std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore);
break;
case Qualifiers::OCL_Weak:
RHS = Visit(E->getRHS());
LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
break;
case Qualifiers::OCL_None:
// __block variables need to have the rhs evaluated first, plus
// this should improve codegen just a little.
Value *Previous = nullptr;
QualType SrcType = E->getRHS()->getType();
// Check if LHS is a bitfield, if RHS contains an implicit cast expression
// we want to extract that value and potentially (if the bitfield sanitizer
// is enabled) use it to check for an implicit conversion.
if (E->getLHS()->refersToBitField())
RHS = CGF.EmitWithOriginalRHSBitfieldAssignment(E, &Previous, &SrcType);
else
RHS = Visit(E->getRHS());
LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
// Store the value into the LHS. Bit-fields are handled specially
// because the result is altered by the store, i.e., [C99 6.5.16p1]
// 'An assignment expression has the value of the left operand after
// the assignment...'.
if (LHS.isBitField()) {
CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
// If the expression contained an implicit conversion, make sure
// to use the value before the scalar conversion.
Value *Src = Previous ? Previous : RHS;
QualType DstType = E->getLHS()->getType();
CGF.EmitBitfieldConversionCheck(Src, SrcType, RHS, DstType,
LHS.getBitFieldInfo(), E->getExprLoc());
} else {
CGF.EmitNullabilityCheck(LHS, RHS, E->getExprLoc());
CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
}
}
// OpenMP: Handle lastprivate(condition:) in scalar assignment
if (CGF.getLangOpts().OpenMP) {
CGF.CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(CGF,
E->getLHS());
}
// If the result is clearly ignored, return now.
if (Ignore)
return nullptr;
// The result of an assignment in C is the assigned r-value.
if (!CGF.getLangOpts().CPlusPlus)
return RHS;
// If the lvalue is non-volatile, return the computed value of the assignment.
if (!LHS.isVolatileQualified())
return RHS;
// Otherwise, reload the value.
return EmitLoadOfLValue(LHS, E->getExprLoc());
}
Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
auto HasLHSSkip = CGF.hasSkipCounter(E);
auto HasRHSSkip = CGF.hasSkipCounter(E->getRHS());
// Perform vector logical and on comparisons with zero vectors.
if (E->getType()->isVectorType()) {
CGF.incrementProfileCounter(E);
Value *LHS = Visit(E->getLHS());
Value *RHS = Visit(E->getRHS());
Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
if (LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(
CGF, E->getFPFeaturesInEffect(CGF.getLangOpts()));
LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
} else {
LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
}
Value *And = Builder.CreateAnd(LHS, RHS);
return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
}
bool InstrumentRegions = CGF.CGM.getCodeGenOpts().hasProfileClangInstr();
llvm::Type *ResTy = ConvertType(E->getType());
// If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
// If we have 1 && X, just emit X without inserting the control flow.
bool LHSCondVal;
if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
if (LHSCondVal) { // If we have 1 && X, just emit X.
CGF.incrementProfileCounter(CGF.UseExecPath, E, /*UseBoth=*/true);
// If the top of the logical operator nest, reset the MCDC temp to 0.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeResetMCDCCondBitmap(E);
Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
// If we're generating for profiling or coverage, generate a branch to a
// block that increments the RHS counter needed to track branch condition
// coverage. In this case, use "FBlock" as both the final "TrueBlock" and
// "FalseBlock" after the increment is done.
if (InstrumentRegions &&
CodeGenFunction::isInstrumentedCondition(E->getRHS())) {
CGF.maybeUpdateMCDCCondBitmap(E->getRHS(), RHSCond);
llvm::BasicBlock *FBlock = CGF.createBasicBlock("land.end");
llvm::BasicBlock *RHSSkip =
(HasRHSSkip ? CGF.createBasicBlock("land.rhsskip") : FBlock);
llvm::BasicBlock *RHSBlockCnt = CGF.createBasicBlock("land.rhscnt");
Builder.CreateCondBr(RHSCond, RHSBlockCnt, RHSSkip);
CGF.EmitBlock(RHSBlockCnt);
CGF.incrementProfileCounter(CGF.UseExecPath, E->getRHS());
CGF.EmitBranch(FBlock);
if (HasRHSSkip) {
CGF.EmitBlock(RHSSkip);
CGF.incrementProfileCounter(CGF.UseSkipPath, E->getRHS());
}
CGF.EmitBlock(FBlock);
} else
CGF.markStmtMaybeUsed(E->getRHS());
// If the top of the logical operator nest, update the MCDC bitmap.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
// ZExt result to int or bool.
return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
}
// 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
if (!CGF.ContainsLabel(E->getRHS())) {
CGF.markStmtAsUsed(false, E);
if (HasLHSSkip)
CGF.incrementProfileCounter(CGF.UseSkipPath, E);
CGF.markStmtMaybeUsed(E->getRHS());
return llvm::Constant::getNullValue(ResTy);
}
}
// If the top of the logical operator nest, reset the MCDC temp to 0.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeResetMCDCCondBitmap(E);
llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
llvm::BasicBlock *LHSFalseBlock =
(HasLHSSkip ? CGF.createBasicBlock("land.lhsskip") : ContBlock);
CodeGenFunction::ConditionalEvaluation eval(CGF);
// Branch on the LHS first. If it is false, go to the failure (cont) block.
CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, LHSFalseBlock,
CGF.getProfileCount(E->getRHS()));
if (HasLHSSkip) {
CGF.EmitBlock(LHSFalseBlock);
CGF.incrementProfileCounter(CGF.UseSkipPath, E);
CGF.EmitBranch(ContBlock);
}
// Any edges into the ContBlock are now from an (indeterminate number of)
// edges from this first condition. All of these values will be false. Start
// setting up the PHI node in the Cont Block for this.
llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
"", ContBlock);
for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
PI != PE; ++PI)
PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
eval.begin(CGF);
CGF.EmitBlock(RHSBlock);
CGF.incrementProfileCounter(CGF.UseExecPath, E);
Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
eval.end(CGF);
// Reaquire the RHS block, as there may be subblocks inserted.
RHSBlock = Builder.GetInsertBlock();
// If we're generating for profiling or coverage, generate a branch on the
// RHS to a block that increments the RHS true counter needed to track branch
// condition coverage.
llvm::BasicBlock *ContIncoming = RHSBlock;
if (InstrumentRegions &&
CodeGenFunction::isInstrumentedCondition(E->getRHS())) {
CGF.maybeUpdateMCDCCondBitmap(E->getRHS(), RHSCond);
llvm::BasicBlock *RHSBlockCnt = CGF.createBasicBlock("land.rhscnt");
llvm::BasicBlock *RHSBlockSkip =
(HasRHSSkip ? CGF.createBasicBlock("land.rhsskip") : ContBlock);
Builder.CreateCondBr(RHSCond, RHSBlockCnt, RHSBlockSkip);
CGF.EmitBlock(RHSBlockCnt);
CGF.incrementProfileCounter(CGF.UseExecPath, E->getRHS());
CGF.EmitBranch(ContBlock);
PN->addIncoming(RHSCond, RHSBlockCnt);
if (HasRHSSkip) {
CGF.EmitBlock(RHSBlockSkip);
CGF.incrementProfileCounter(CGF.UseSkipPath, E->getRHS());
CGF.EmitBranch(ContBlock);
ContIncoming = RHSBlockSkip;
}
}
// Emit an unconditional branch from this block to ContBlock.
{
// There is no need to emit line number for unconditional branch.
auto NL = ApplyDebugLocation::CreateEmpty(CGF);
CGF.EmitBlock(ContBlock);
}
// Insert an entry into the phi node for the edge with the value of RHSCond.
PN->addIncoming(RHSCond, ContIncoming);
// If the top of the logical operator nest, update the MCDC bitmap.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
// Artificial location to preserve the scope information
{
auto NL = ApplyDebugLocation::CreateArtificial(CGF);
PN->setDebugLoc(Builder.getCurrentDebugLocation());
}
// ZExt result to int.
return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
}
Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
auto HasLHSSkip = CGF.hasSkipCounter(E);
auto HasRHSSkip = CGF.hasSkipCounter(E->getRHS());
// Perform vector logical or on comparisons with zero vectors.
if (E->getType()->isVectorType()) {
CGF.incrementProfileCounter(E);
Value *LHS = Visit(E->getLHS());
Value *RHS = Visit(E->getRHS());
Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
if (LHS->getType()->isFPOrFPVectorTy()) {
CodeGenFunction::CGFPOptionsRAII FPOptsRAII(
CGF, E->getFPFeaturesInEffect(CGF.getLangOpts()));
LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
} else {
LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
}
Value *Or = Builder.CreateOr(LHS, RHS);
return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
}
bool InstrumentRegions = CGF.CGM.getCodeGenOpts().hasProfileClangInstr();
llvm::Type *ResTy = ConvertType(E->getType());
// If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
// If we have 0 || X, just emit X without inserting the control flow.
bool LHSCondVal;
if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
if (!LHSCondVal) { // If we have 0 || X, just emit X.
CGF.incrementProfileCounter(CGF.UseExecPath, E, /*UseBoth=*/true);
// If the top of the logical operator nest, reset the MCDC temp to 0.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeResetMCDCCondBitmap(E);
Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
// If we're generating for profiling or coverage, generate a branch to a
// block that increments the RHS counter need to track branch condition
// coverage. In this case, use "FBlock" as both the final "TrueBlock" and
// "FalseBlock" after the increment is done.
if (InstrumentRegions &&
CodeGenFunction::isInstrumentedCondition(E->getRHS())) {
CGF.maybeUpdateMCDCCondBitmap(E->getRHS(), RHSCond);
llvm::BasicBlock *FBlock = CGF.createBasicBlock("lor.end");
llvm::BasicBlock *RHSSkip =
(HasRHSSkip ? CGF.createBasicBlock("lor.rhsskip") : FBlock);
llvm::BasicBlock *RHSBlockCnt = CGF.createBasicBlock("lor.rhscnt");
Builder.CreateCondBr(RHSCond, RHSSkip, RHSBlockCnt);
CGF.EmitBlock(RHSBlockCnt);
CGF.incrementProfileCounter(CGF.UseExecPath, E->getRHS());
CGF.EmitBranch(FBlock);
if (HasRHSSkip) {
CGF.EmitBlock(RHSSkip);
CGF.incrementProfileCounter(CGF.UseSkipPath, E->getRHS());
}
CGF.EmitBlock(FBlock);
} else
CGF.markStmtMaybeUsed(E->getRHS());
// If the top of the logical operator nest, update the MCDC bitmap.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
// ZExt result to int or bool.
return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
}
// 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
if (!CGF.ContainsLabel(E->getRHS())) {
CGF.markStmtAsUsed(false, E);
if (HasLHSSkip)
CGF.incrementProfileCounter(CGF.UseSkipPath, E);
CGF.markStmtMaybeUsed(E->getRHS());
return llvm::ConstantInt::get(ResTy, 1);
}
}
// If the top of the logical operator nest, reset the MCDC temp to 0.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeResetMCDCCondBitmap(E);
llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
llvm::BasicBlock *LHSTrueBlock =
(HasLHSSkip ? CGF.createBasicBlock("lor.lhsskip") : ContBlock);
CodeGenFunction::ConditionalEvaluation eval(CGF);
// Branch on the LHS first. If it is true, go to the success (cont) block.
CGF.EmitBranchOnBoolExpr(E->getLHS(), LHSTrueBlock, RHSBlock,
CGF.getCurrentProfileCount() -
CGF.getProfileCount(E->getRHS()));
if (HasLHSSkip) {
CGF.EmitBlock(LHSTrueBlock);
CGF.incrementProfileCounter(CGF.UseSkipPath, E);
CGF.EmitBranch(ContBlock);
}
// Any edges into the ContBlock are now from an (indeterminate number of)
// edges from this first condition. All of these values will be true. Start
// setting up the PHI node in the Cont Block for this.
llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
"", ContBlock);
for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
PI != PE; ++PI)
PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
eval.begin(CGF);
// Emit the RHS condition as a bool value.
CGF.EmitBlock(RHSBlock);
CGF.incrementProfileCounter(CGF.UseExecPath, E);
Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
eval.end(CGF);
// Reaquire the RHS block, as there may be subblocks inserted.
RHSBlock = Builder.GetInsertBlock();
// If we're generating for profiling or coverage, generate a branch on the
// RHS to a block that increments the RHS true counter needed to track branch
// condition coverage.
llvm::BasicBlock *ContIncoming = RHSBlock;
if (InstrumentRegions &&
CodeGenFunction::isInstrumentedCondition(E->getRHS())) {
CGF.maybeUpdateMCDCCondBitmap(E->getRHS(), RHSCond);
llvm::BasicBlock *RHSBlockCnt = CGF.createBasicBlock("lor.rhscnt");
llvm::BasicBlock *RHSTrueBlock =
(HasRHSSkip ? CGF.createBasicBlock("lor.rhsskip") : ContBlock);
Builder.CreateCondBr(RHSCond, RHSTrueBlock, RHSBlockCnt);
CGF.EmitBlock(RHSBlockCnt);
CGF.incrementProfileCounter(CGF.UseExecPath, E->getRHS());
CGF.EmitBranch(ContBlock);
PN->addIncoming(RHSCond, RHSBlockCnt);
if (HasRHSSkip) {
CGF.EmitBlock(RHSTrueBlock);
CGF.incrementProfileCounter(CGF.UseSkipPath, E->getRHS());
CGF.EmitBranch(ContBlock);
ContIncoming = RHSTrueBlock;
}
}
// Emit an unconditional branch from this block to ContBlock. Insert an entry
// into the phi node for the edge with the value of RHSCond.
CGF.EmitBlock(ContBlock);
PN->addIncoming(RHSCond, ContIncoming);
// If the top of the logical operator nest, update the MCDC bitmap.
if (CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
// ZExt result to int.
return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
}
Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
CGF.EmitIgnoredExpr(E->getLHS());
CGF.EnsureInsertPoint();
return Visit(E->getRHS());
}
//===----------------------------------------------------------------------===//
// Other Operators
//===----------------------------------------------------------------------===//
Value *ScalarExprEmitter::
VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
TestAndClearIgnoreResultAssign();
// Bind the common expression if necessary.
CodeGenFunction::OpaqueValueMapping binding(CGF, E);
Expr *condExpr = E->getCond();
Expr *lhsExpr = E->getTrueExpr();
Expr *rhsExpr = E->getFalseExpr();
// If the condition constant folds and can be elided, try to avoid emitting
// the condition and the dead arm.
bool CondExprBool;
if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
Expr *live = lhsExpr, *dead = rhsExpr;
if (!CondExprBool) std::swap(live, dead);
// If the dead side doesn't have labels we need, just emit the Live part.
if (!CGF.ContainsLabel(dead)) {
CGF.incrementProfileCounter(CondExprBool ? CGF.UseExecPath
: CGF.UseSkipPath,
E, /*UseBoth=*/true);
Value *Result = Visit(live);
CGF.markStmtMaybeUsed(dead);
// If the live part is a throw expression, it acts like it has a void
// type, so evaluating it returns a null Value*. However, a conditional
// with non-void type must return a non-null Value*.
if (!Result && !E->getType()->isVoidType())
Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
return Result;
}
}
// OpenCL: If the condition is a vector, we can treat this condition like
// the select function.
if (CGF.getLangOpts().OpenCL && (condExpr->getType()->isVectorType() ||
condExpr->getType()->isExtVectorType())) {
CGF.incrementProfileCounter(E);
llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
llvm::Value *LHS = Visit(lhsExpr);
llvm::Value *RHS = Visit(rhsExpr);
llvm::Type *condType = ConvertType(condExpr->getType());
auto *vecTy = cast<llvm::FixedVectorType>(condType);
unsigned numElem = vecTy->getNumElements();
llvm::Type *elemType = vecTy->getElementType();
llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
llvm::Value *tmp = Builder.CreateSExt(
TestMSB, llvm::FixedVectorType::get(elemType, numElem), "sext");
llvm::Value *tmp2 = Builder.CreateNot(tmp);
// Cast float to int to perform ANDs if necessary.
llvm::Value *RHSTmp = RHS;
llvm::Value *LHSTmp = LHS;
bool wasCast = false;
llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
if (rhsVTy->getElementType()->isFloatingPointTy()) {
RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
wasCast = true;
}
llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
if (wasCast)
tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
return tmp5;
}
if (condExpr->getType()->isVectorType() ||
condExpr->getType()->isSveVLSBuiltinType()) {
CGF.incrementProfileCounter(E);
llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
llvm::Value *LHS = Visit(lhsExpr);
llvm::Value *RHS = Visit(rhsExpr);
llvm::Type *CondType = ConvertType(condExpr->getType());
auto *VecTy = cast<llvm::VectorType>(CondType);
if (VecTy->getElementType()->isIntegerTy(1))
return Builder.CreateSelect(CondV, LHS, RHS, "vector_select");
// OpenCL uses the MSB of the mask vector.
llvm::Value *ZeroVec = llvm::Constant::getNullValue(VecTy);
if (condExpr->getType()->isExtVectorType())
CondV = Builder.CreateICmpSLT(CondV, ZeroVec, "vector_cond");
else
CondV = Builder.CreateICmpNE(CondV, ZeroVec, "vector_cond");
return Builder.CreateSelect(CondV, LHS, RHS, "vector_select");
}
// If this is a really simple expression (like x ? 4 : 5), emit this as a
// select instead of as control flow. We can only do this if it is cheap and
// safe to evaluate the LHS and RHS unconditionally.
if (!llvm::EnableSingleByteCoverage &&
CodeGenUtils::isCheapEnoughToEvaluateUnconditionally(lhsExpr,
CGF.getContext()) &&
CodeGenUtils::isCheapEnoughToEvaluateUnconditionally(rhsExpr,
CGF.getContext())) {
llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
llvm::Value *StepV = Builder.CreateZExtOrBitCast(CondV, CGF.Int64Ty);
CGF.incrementProfileCounter(E, StepV);
llvm::Value *LHS = Visit(lhsExpr);
llvm::Value *RHS = Visit(rhsExpr);
if (!LHS) {
// If the conditional has void type, make sure we return a null Value*.
assert(!RHS && "LHS and RHS types must match");
return nullptr;
}
return Builder.CreateSelect(CondV, LHS, RHS, "cond");
}
// If the top of the logical operator nest, reset the MCDC temp to 0.
if (auto E = CGF.stripCond(condExpr); CGF.isMCDCDecisionExpr(E))
CGF.maybeResetMCDCCondBitmap(E);
llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
CodeGenFunction::ConditionalEvaluation eval(CGF);
CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock,
CGF.getProfileCount(lhsExpr));
CGF.EmitBlock(LHSBlock);
// If the top of the logical operator nest, update the MCDC bitmap for the
// ConditionalOperator prior to visiting its LHS and RHS blocks, since they
// may also contain a boolean expression.
if (auto E = CGF.stripCond(condExpr); CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
CGF.incrementProfileCounter(CGF.UseExecPath, E);
eval.begin(CGF);
Value *LHS = Visit(lhsExpr);
eval.end(CGF);
LHSBlock = Builder.GetInsertBlock();
Builder.CreateBr(ContBlock);
CGF.EmitBlock(RHSBlock);
// If the top of the logical operator nest, update the MCDC bitmap for the
// ConditionalOperator prior to visiting its LHS and RHS blocks, since they
// may also contain a boolean expression.
if (auto E = CGF.stripCond(condExpr); CGF.isMCDCDecisionExpr(E))
CGF.maybeUpdateMCDCTestVectorBitmap(E);
CGF.incrementProfileCounter(CGF.UseSkipPath, E);
eval.begin(CGF);
Value *RHS = Visit(rhsExpr);
eval.end(CGF);
RHSBlock = Builder.GetInsertBlock();
CGF.EmitBlock(ContBlock);
// If the LHS or RHS is a throw expression, it will be legitimately null.
if (!LHS)
return RHS;
if (!RHS)
return LHS;
// Create a PHI node for the real part.
llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
PN->addIncoming(LHS, LHSBlock);
PN->addIncoming(RHS, RHSBlock);
return PN;
}
Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
return Visit(E->getChosenSubExpr());
}
Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
Address ArgValue = Address::invalid();
RValue ArgPtr = CGF.EmitVAArg(VE, ArgValue);
return ArgPtr.getScalarVal();
}
Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
return CGF.EmitBlockLiteral(block);
}
// Convert a vec3 to vec4, or vice versa.
static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF,
Value *Src, unsigned NumElementsDst) {
static constexpr int Mask[] = {0, 1, 2, -1};
return Builder.CreateShuffleVector(Src, llvm::ArrayRef(Mask, NumElementsDst));
}
// Create cast instructions for converting LLVM value \p Src to LLVM type \p
// DstTy. \p Src has the same size as \p DstTy. Both are single value types
// but could be scalar or vectors of different lengths, and either can be
// pointer.
// There are 4 cases:
// 1. non-pointer -> non-pointer : needs 1 bitcast
// 2. pointer -> pointer : needs 1 bitcast or addrspacecast
// 3. pointer -> non-pointer
// a) pointer -> intptr_t : needs 1 ptrtoint
// b) pointer -> non-intptr_t : needs 1 ptrtoint then 1 bitcast
// 4. non-pointer -> pointer
// a) intptr_t -> pointer : needs 1 inttoptr
// b) non-intptr_t -> pointer : needs 1 bitcast then 1 inttoptr
// Note: for cases 3b and 4b two casts are required since LLVM casts do not
// allow casting directly between pointer types and non-integer non-pointer
// types.
static Value *createCastsForTypeOfSameSize(CGBuilderTy &Builder,
const llvm::DataLayout &DL,
Value *Src, llvm::Type *DstTy,
StringRef Name = "") {
auto SrcTy = Src->getType();
// Case 1.
if (!SrcTy->isPointerTy() && !DstTy->isPointerTy())
return Builder.CreateBitCast(Src, DstTy, Name);
// Case 2.
if (SrcTy->isPointerTy() && DstTy->isPointerTy())
return Builder.CreatePointerBitCastOrAddrSpaceCast(Src, DstTy, Name);
// Case 3.
if (SrcTy->isPointerTy() && !DstTy->isPointerTy()) {
// Case 3b.
if (!DstTy->isIntegerTy())
Src = Builder.CreatePtrToInt(Src, DL.getIntPtrType(SrcTy));
// Cases 3a and 3b.
return Builder.CreateBitOrPointerCast(Src, DstTy, Name);
}
// Case 4b.
if (!SrcTy->isIntegerTy())
Src = Builder.CreateBitCast(Src, DL.getIntPtrType(DstTy));
// Cases 4a and 4b.
return Builder.CreateIntToPtr(Src, DstTy, Name);
}
Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
llvm::Type *DstTy = ConvertType(E->getType());
llvm::Type *SrcTy = Src->getType();
unsigned NumElementsSrc =
isa<llvm::VectorType>(SrcTy)
? cast<llvm::FixedVectorType>(SrcTy)->getNumElements()
: 0;
unsigned NumElementsDst =
isa<llvm::VectorType>(DstTy)
? cast<llvm::FixedVectorType>(DstTy)->getNumElements()
: 0;
// Use bit vector expansion for ext_vector_type boolean vectors.
if (E->getType()->isExtVectorBoolType())
return CGF.emitBoolVecConversion(Src, NumElementsDst, "astype");
// Going from vec3 to non-vec3 is a special case and requires a shuffle
// vector to get a vec4, then a bitcast if the target type is different.
if (NumElementsSrc == 3 && NumElementsDst != 3) {
Src = ConvertVec3AndVec4(Builder, CGF, Src, 4);
Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
DstTy);
Src->setName("astype");
return Src;
}
// Going from non-vec3 to vec3 is a special case and requires a bitcast
// to vec4 if the original type is not vec4, then a shuffle vector to
// get a vec3.
if (NumElementsSrc != 3 && NumElementsDst == 3) {
auto *Vec4Ty = llvm::FixedVectorType::get(
cast<llvm::VectorType>(DstTy)->getElementType(), 4);
Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src,
Vec4Ty);
Src = ConvertVec3AndVec4(Builder, CGF, Src, 3);
Src->setName("astype");
return Src;
}
return createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(),
Src, DstTy, "astype");
}
Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
return CGF.EmitAtomicExpr(E).getScalarVal();
}
//===----------------------------------------------------------------------===//
// Entry Point into this File
//===----------------------------------------------------------------------===//
/// Emit the computation of the specified expression of scalar type, ignoring
/// the result.
Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
assert(E && hasScalarEvaluationKind(E->getType()) &&
"Invalid scalar expression to emit");
return ScalarExprEmitter(*this, IgnoreResultAssign)
.Visit(const_cast<Expr *>(E));
}
/// Emit a conversion from the specified type to the specified destination type,
/// both of which are LLVM scalar types.
Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
QualType DstTy,
SourceLocation Loc) {
assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
"Invalid scalar expression to emit");
return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc);
}
/// Emit a conversion from the specified complex type to the specified
/// destination type, where the destination type is an LLVM scalar type.
Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
QualType SrcTy,
QualType DstTy,
SourceLocation Loc) {
assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
"Invalid complex -> scalar conversion");
return ScalarExprEmitter(*this)
.EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc);
}
Value *
CodeGenFunction::EmitPromotedScalarExpr(const Expr *E,
QualType PromotionType) {
if (!PromotionType.isNull())
return ScalarExprEmitter(*this).EmitPromoted(E, PromotionType);
else
return ScalarExprEmitter(*this).Visit(const_cast<Expr *>(E));
}
llvm::Value *CodeGenFunction::
EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
bool isInc, bool isPre) {
return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
}
LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
// object->isa or (*object).isa
// Generate code as for: *(Class*)object
Expr *BaseExpr = E->getBase();
Address Addr = Address::invalid();
if (BaseExpr->isPRValue()) {
llvm::Type *BaseTy =
ConvertTypeForMem(BaseExpr->getType()->getPointeeType());
Addr = Address(EmitScalarExpr(BaseExpr), BaseTy, getPointerAlign());
} else {
Addr = EmitLValue(BaseExpr).getAddress();
}
// Cast the address to Class*.
Addr = Addr.withElementType(ConvertType(E->getType()));
return MakeAddrLValue(Addr, E->getType());
}
LValue CodeGenFunction::EmitCompoundAssignmentLValue(
const CompoundAssignOperator *E) {
ApplyAtomGroup Grp(getDebugInfo());
ScalarExprEmitter Scalar(*this);
Value *Result = nullptr;
switch (E->getOpcode()) {
#define COMPOUND_OP(Op) \
case BO_##Op##Assign: \
return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
Result)
COMPOUND_OP(Mul);
COMPOUND_OP(Div);
COMPOUND_OP(Rem);
COMPOUND_OP(Add);
COMPOUND_OP(Sub);
COMPOUND_OP(Shl);
COMPOUND_OP(Shr);
COMPOUND_OP(And);
COMPOUND_OP(Xor);
COMPOUND_OP(Or);
#undef COMPOUND_OP
case BO_PtrMemD:
case BO_PtrMemI:
case BO_Mul:
case BO_Div:
case BO_Rem:
case BO_Add:
case BO_Sub:
case BO_Shl:
case BO_Shr:
case BO_LT:
case BO_GT:
case BO_LE:
case BO_GE:
case BO_EQ:
case BO_NE:
case BO_Cmp:
case BO_And:
case BO_Xor:
case BO_Or:
case BO_LAnd:
case BO_LOr:
case BO_Assign:
case BO_Comma:
llvm_unreachable("Not valid compound assignment operators");
}
llvm_unreachable("Unhandled compound assignment operator");
}
struct GEPOffsetAndOverflow {
// The total (signed) byte offset for the GEP.
llvm::Value *TotalOffset;
// The offset overflow flag - true if the total offset overflows.
llvm::Value *OffsetOverflows;
};
/// Compute the total offset in bytes that indexing BasePtr with ElemTy and
/// IdxList applies, using checked arithmetic.
/// Returns offset in bytes and a boolean flag whether an overflow happened
/// during evaluation.
static GEPOffsetAndOverflow
EmitGEPOffsetInBytes(Value *BasePtr, llvm::Type *ElemTy,
ArrayRef<Value *> IdxList, llvm::LLVMContext &VMContext,
CodeGenModule &CGM, CGBuilderTy &Builder) {
const auto &DL = CGM.getDataLayout();
// The total (signed) byte offset for the GEP.
llvm::Value *TotalOffset = nullptr;
auto *IntPtrTy = DL.getAddressType(BasePtr->getType());
// Grab references to the signed add/mul overflow intrinsics for intptr_t.
auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy);
auto *SAddIntrinsic =
CGM.getIntrinsic(llvm::Intrinsic::sadd_with_overflow, IntPtrTy);
auto *SMulIntrinsic =
CGM.getIntrinsic(llvm::Intrinsic::smul_with_overflow, IntPtrTy);
// The offset overflow flag - true if the total offset overflows.
llvm::Value *OffsetOverflows = Builder.getFalse();
/// Return the result of the given binary operation.
auto eval = [&](BinaryOperator::Opcode Opcode, llvm::Value *LHS,
llvm::Value *RHS) -> llvm::Value * {
assert((Opcode == BO_Add || Opcode == BO_Mul) && "Can't eval binop");
// If the operands are constants, return a constant result.
if (auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS)) {
if (auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS)) {
llvm::APInt N;
bool HasOverflow = mayHaveIntegerOverflow(LHSCI, RHSCI, Opcode,
/*Signed=*/true, N);
if (HasOverflow)
OffsetOverflows = Builder.getTrue();
return llvm::ConstantInt::get(VMContext, N);
}
}
// Otherwise, compute the result with checked arithmetic.
auto *ResultAndOverflow = Builder.CreateCall(
(Opcode == BO_Add) ? SAddIntrinsic : SMulIntrinsic, {LHS, RHS});
OffsetOverflows = Builder.CreateOr(
Builder.CreateExtractValue(ResultAndOverflow, 1), OffsetOverflows);
return Builder.CreateExtractValue(ResultAndOverflow, 0);
};
// Determine the total byte offset by looking at each GEP operand.
for (auto GTI = llvm::gep_type_begin(ElemTy, IdxList),
GTE = llvm::gep_type_end(ElemTy, IdxList);
GTI != GTE; ++GTI) {
llvm::Value *LocalOffset;
auto *Index = GTI.getOperand();
// Compute the local offset contributed by this indexing step:
if (auto *STy = GTI.getStructTypeOrNull()) {
// For struct indexing, the local offset is the byte position of the
// specified field.
unsigned FieldNo = cast<llvm::ConstantInt>(Index)->getZExtValue();
LocalOffset = llvm::ConstantInt::get(
IntPtrTy, DL.getStructLayout(STy)->getElementOffset(FieldNo));
} else {
// Otherwise this is array-like indexing. The local offset is the index
// multiplied by the element size.
auto *ElementSize =
llvm::ConstantInt::get(IntPtrTy, GTI.getSequentialElementStride(DL));
auto *IndexS = Builder.CreateIntCast(Index, IntPtrTy, /*isSigned=*/true);
LocalOffset = eval(BO_Mul, ElementSize, IndexS);
}
// If this is the first offset, set it as the total offset. Otherwise, add
// the local offset into the running total.
if (!TotalOffset || TotalOffset == Zero)
TotalOffset = LocalOffset;
else
TotalOffset = eval(BO_Add, TotalOffset, LocalOffset);
}
return {TotalOffset, OffsetOverflows};
}
// OpenMP section maps pass `section - host_offset`. A GEP of an array-of-arrays
// from that pointer is not inbounds of the allocation.
static llvm::GEPNoWrapFlags
inBoundsGEPFlags(const CodeGenFunction &CGF, const llvm::Value *Ptr,
llvm::Type *SrcTy, bool SignedIndices, bool IsSubtraction) {
llvm::GEPNoWrapFlags NW;
bool SectionGEP = CGF.getLangOpts().OpenMPIsTargetDevice &&
SrcTy->isArrayTy() &&
SrcTy->getArrayElementType()->isArrayTy() &&
!isa<llvm::AllocaInst>(llvm::getUnderlyingObject(Ptr));
if (!SectionGEP)
NW = llvm::GEPNoWrapFlags::inBounds();
if (!SignedIndices && !IsSubtraction)
NW |= llvm::GEPNoWrapFlags::noUnsignedWrap();
return NW;
}
Value *
CodeGenFunction::EmitCheckedInBoundsGEP(llvm::Type *ElemTy, Value *Ptr,
ArrayRef<Value *> IdxList,
bool SignedIndices, bool IsSubtraction,
SourceLocation Loc, const Twine &Name) {
llvm::Type *PtrTy = Ptr->getType();
llvm::GEPNoWrapFlags NWFlags =
inBoundsGEPFlags(*this, Ptr, ElemTy, SignedIndices, IsSubtraction);
Value *GEPVal = Builder.CreateGEP(ElemTy, Ptr, IdxList, Name, NWFlags);
// If the pointer overflow sanitizer isn't enabled, do nothing.
if (!SanOpts.has(SanitizerKind::PointerOverflow))
return GEPVal;
// Perform nullptr-and-offset check unless the nullptr is defined.
bool PerformNullCheck = !NullPointerIsDefined(
Builder.GetInsertBlock()->getParent(), PtrTy->getPointerAddressSpace());
// Check for overflows unless the GEP got constant-folded,
// and only in the default address space
bool PerformOverflowCheck =
!isa<llvm::Constant>(GEPVal) && PtrTy->getPointerAddressSpace() == 0;
if (!(PerformNullCheck || PerformOverflowCheck))
return GEPVal;
const auto &DL = CGM.getDataLayout();
auto CheckOrdinal = SanitizerKind::SO_PointerOverflow;
auto CheckHandler = SanitizerHandler::PointerOverflow;
SanitizerDebugLocation SanScope(this, {CheckOrdinal}, CheckHandler);
llvm::Type *IntPtrTy = DL.getAddressType(PtrTy);
GEPOffsetAndOverflow EvaluatedGEP = EmitGEPOffsetInBytes(
Ptr, ElemTy, IdxList, getLLVMContext(), CGM, Builder);
auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy);
// Common case: if the total offset is zero and has not overflowed, don't emit
// a check.
if (EvaluatedGEP.TotalOffset == Zero &&
EvaluatedGEP.OffsetOverflows == Builder.getFalse())
return GEPVal;
// Now that we've computed the total offset, add it to the base pointer (with
// wrapping semantics).
auto *IntPtr = Builder.CreatePtrToAddr(Ptr);
auto *ComputedGEP = Builder.CreateAdd(IntPtr, EvaluatedGEP.TotalOffset);
llvm::SmallVector<std::pair<llvm::Value *, SanitizerKind::SanitizerOrdinal>,
2>
Checks;
if (PerformNullCheck) {
// If the base pointer evaluates to a null pointer value,
// the only valid pointer this inbounds GEP can produce is also
// a null pointer, so the offset must also evaluate to zero.
// Likewise, if we have non-zero base pointer, we can not get null pointer
// as a result, so the offset can not be -intptr_t(BasePtr).
// In other words, both pointers are either null, or both are non-null,
// or the behaviour is undefined.
auto *BaseIsNotNullptr = Builder.CreateIsNotNull(Ptr);
auto *ResultIsNotNullptr = Builder.CreateIsNotNull(ComputedGEP);
auto *Valid = Builder.CreateICmpEQ(BaseIsNotNullptr, ResultIsNotNullptr);
Checks.emplace_back(Valid, CheckOrdinal);
}
if (PerformOverflowCheck) {
// The GEP is valid if:
// 1) The total offset doesn't overflow, and
// 2) The sign of the difference between the computed address and the base
// pointer matches the sign of the total offset.
llvm::Value *ValidGEP;
auto *NoOffsetOverflow = Builder.CreateNot(EvaluatedGEP.OffsetOverflows);
if (SignedIndices) {
// GEP is computed as `unsigned base + signed offset`, therefore:
// * If offset was positive, then the computed pointer can not be
// [unsigned] less than the base pointer, unless it overflowed.
// * If offset was negative, then the computed pointer can not be
// [unsigned] greater than the bas pointere, unless it overflowed.
auto *PosOrZeroValid = Builder.CreateICmpUGE(ComputedGEP, IntPtr);
auto *PosOrZeroOffset =
Builder.CreateICmpSGE(EvaluatedGEP.TotalOffset, Zero);
llvm::Value *NegValid = Builder.CreateICmpULT(ComputedGEP, IntPtr);
ValidGEP =
Builder.CreateSelect(PosOrZeroOffset, PosOrZeroValid, NegValid);
} else if (!IsSubtraction) {
// GEP is computed as `unsigned base + unsigned offset`, therefore the
// computed pointer can not be [unsigned] less than base pointer,
// unless there was an overflow.
// Equivalent to `@llvm.uadd.with.overflow(%base, %offset)`.
ValidGEP = Builder.CreateICmpUGE(ComputedGEP, IntPtr);
} else {
// GEP is computed as `unsigned base - unsigned offset`, therefore the
// computed pointer can not be [unsigned] greater than base pointer,
// unless there was an overflow.
// Equivalent to `@llvm.usub.with.overflow(%base, sub(0, %offset))`.
ValidGEP = Builder.CreateICmpULE(ComputedGEP, IntPtr);
}
ValidGEP = Builder.CreateAnd(ValidGEP, NoOffsetOverflow);
Checks.emplace_back(ValidGEP, CheckOrdinal);
}
assert(!Checks.empty() && "Should have produced some checks.");
llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc)};
// Pass the computed GEP to the runtime to avoid emitting poisoned arguments.
llvm::Value *DynamicArgs[] = {IntPtr, ComputedGEP};
EmitCheck(Checks, CheckHandler, StaticArgs, DynamicArgs);
return GEPVal;
}
Address CodeGenFunction::EmitCheckedInBoundsGEP(
Address Addr, ArrayRef<Value *> IdxList, llvm::Type *elementType,
bool SignedIndices, bool IsSubtraction, SourceLocation Loc, CharUnits Align,
const Twine &Name) {
if (!SanOpts.has(SanitizerKind::PointerOverflow)) {
llvm::GEPNoWrapFlags NWFlags =
inBoundsGEPFlags(*this, Addr.getBasePointer(), Addr.getElementType(),
SignedIndices, IsSubtraction);
return Builder.CreateGEP(Addr, IdxList, elementType, Align, Name, NWFlags);
}
return RawAddress(
EmitCheckedInBoundsGEP(Addr.getElementType(), Addr.emitRawPointer(*this),
IdxList, SignedIndices, IsSubtraction, Loc, Name),
elementType, Align);
}