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//===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h --------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file contains support for writing Microsoft CodeView debug info.
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
#include "llvm/CodeGen/DebugHandlerBase.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Compiler.h"
#include <cstdint>
#include <map>
#include <string>
#include <tuple>
#include <unordered_map>
#include <utility>
#include <vector>
namespace llvm {
struct ClassInfo;
class StringRef;
class AsmPrinter;
class Function;
class GlobalVariable;
class MCSectionCOFF;
class MCStreamer;
class MCSymbol;
class MachineFunction;
/// Collects and handles line tables information in a CodeView format.
class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
MCStreamer &OS;
BumpPtrAllocator Allocator;
codeview::GlobalTypeTableBuilder TypeTable;
/// Whether to emit type record hashes into .debug$H.
bool EmitDebugGlobalHashes = false;
/// The codeview CPU type used by the translation unit.
codeview::CPUType TheCPU;
/// Represents the most general definition range.
struct LocalVarDefRange {
/// Indicates that variable data is stored in memory relative to the
/// specified register.
int InMemory : 1;
/// Offset of variable data in memory.
int DataOffset : 31;
/// Non-zero if this is a piece of an aggregate.
uint16_t IsSubfield : 1;
/// Offset into aggregate.
uint16_t StructOffset : 15;
/// Register containing the data or the register base of the memory
/// location containing the data.
uint16_t CVRegister;
/// Compares all location fields. This includes all fields except the label
/// ranges.
bool isDifferentLocation(LocalVarDefRange &O) {
return InMemory != O.InMemory || DataOffset != O.DataOffset ||
IsSubfield != O.IsSubfield || StructOffset != O.StructOffset ||
CVRegister != O.CVRegister;
SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 1> Ranges;
static LocalVarDefRange createDefRangeMem(uint16_t CVRegister, int Offset);
/// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
struct LocalVariable {
const DILocalVariable *DIVar = nullptr;
SmallVector<LocalVarDefRange, 1> DefRanges;
bool UseReferenceType = false;
struct CVGlobalVariable {
const DIGlobalVariable *DIGV;
const GlobalVariable *GV;
struct InlineSite {
SmallVector<LocalVariable, 1> InlinedLocals;
SmallVector<const DILocation *, 1> ChildSites;
const DISubprogram *Inlinee = nullptr;
/// The ID of the inline site or function used with .cv_loc. Not a type
/// index.
unsigned SiteFuncId = 0;
// Combines information from DILexicalBlock and LexicalScope.
struct LexicalBlock {
SmallVector<LocalVariable, 1> Locals;
SmallVector<CVGlobalVariable, 1> Globals;
SmallVector<LexicalBlock *, 1> Children;
const MCSymbol *Begin;
const MCSymbol *End;
StringRef Name;
// For each function, store a vector of labels to its instructions, as well as
// to the end of the function.
struct FunctionInfo {
FunctionInfo() = default;
// Uncopyable.
FunctionInfo(const FunctionInfo &FI) = delete;
/// Map from inlined call site to inlined instructions and child inlined
/// call sites. Listed in program order.
std::unordered_map<const DILocation *, InlineSite> InlineSites;
/// Ordered list of top-level inlined call sites.
SmallVector<const DILocation *, 1> ChildSites;
SmallVector<LocalVariable, 1> Locals;
SmallVector<CVGlobalVariable, 1> Globals;
std::unordered_map<const DILexicalBlockBase*, LexicalBlock> LexicalBlocks;
// Lexical blocks containing local variables.
SmallVector<LexicalBlock *, 1> ChildBlocks;
std::vector<std::pair<MCSymbol *, MDNode *>> Annotations;
const MCSymbol *Begin = nullptr;
const MCSymbol *End = nullptr;
unsigned FuncId = 0;
unsigned LastFileId = 0;
/// Number of bytes allocated in the prologue for all local stack objects.
unsigned FrameSize = 0;
/// Number of bytes of parameters on the stack.
unsigned ParamSize = 0;
/// Number of bytes pushed to save CSRs.
unsigned CSRSize = 0;
/// Adjustment to apply on x86 when using the VFRAME frame pointer.
int OffsetAdjustment = 0;
/// Two-bit value indicating which register is the designated frame pointer
/// register for local variables. Included in S_FRAMEPROC.
codeview::EncodedFramePtrReg EncodedLocalFramePtrReg =
/// Two-bit value indicating which register is the designated frame pointer
/// register for stack parameters. Included in S_FRAMEPROC.
codeview::EncodedFramePtrReg EncodedParamFramePtrReg =
codeview::FrameProcedureOptions FrameProcOpts;
bool HasStackRealignment = false;
bool HaveLineInfo = false;
FunctionInfo *CurFn = nullptr;
// Map used to seperate variables according to the lexical scope they belong
// in. This is populated by recordLocalVariable() before
// collectLexicalBlocks() separates the variables between the FunctionInfo
// and LexicalBlocks.
DenseMap<const LexicalScope *, SmallVector<LocalVariable, 1>> ScopeVariables;
// Map to separate global variables according to the lexical scope they
// belong in. A null local scope represents the global scope.
typedef SmallVector<CVGlobalVariable, 1> GlobalVariableList;
DenseMap<const DIScope*, std::unique_ptr<GlobalVariableList> > ScopeGlobals;
// Array of global variables which need to be emitted into a COMDAT section.
SmallVector<CVGlobalVariable, 1> ComdatVariables;
// Array of non-COMDAT global variables.
SmallVector<CVGlobalVariable, 1> GlobalVariables;
/// The set of comdat .debug$S sections that we've seen so far. Each section
/// must start with a magic version number that must only be emitted once.
/// This set tracks which sections we've already opened.
DenseSet<MCSectionCOFF *> ComdatDebugSections;
/// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
/// of an emitted global value, is in a comdat COFF section, this will switch
/// to a new .debug$S section in that comdat. This method ensures that the
/// section starts with the magic version number on first use. If GVSym is
/// null, uses the main .debug$S section.
void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
/// The next available function index for use with our .cv_* directives. Not
/// to be confused with type indices for LF_FUNC_ID records.
unsigned NextFuncId = 0;
InlineSite &getInlineSite(const DILocation *InlinedAt,
const DISubprogram *Inlinee);
codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
void calculateRanges(LocalVariable &Var,
const DbgValueHistoryMap::InstrRanges &Ranges);
static void collectInlineSiteChildren(SmallVectorImpl<unsigned> &Children,
const FunctionInfo &FI,
const InlineSite &Site);
/// Remember some debug info about each function. Keep it in a stable order to
/// emit at the end of the TU.
MapVector<const Function *, std::unique_ptr<FunctionInfo>> FnDebugInfo;
/// Map from full file path to .cv_file id. Full paths are built from DIFiles
/// and are stored in FileToFilepathMap;
DenseMap<StringRef, unsigned> FileIdMap;
/// All inlined subprograms in the order they should be emitted.
SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
/// Map from a pair of DI metadata nodes and its DI type (or scope) that can
/// be nullptr, to CodeView type indices. Primarily indexed by
/// {DIType*, DIType*} and {DISubprogram*, DIType*}.
/// The second entry in the key is needed for methods as DISubroutineType
/// representing static method type are shared with non-method function type.
DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
/// Map from DICompositeType* to complete type index. Non-record types are
/// always looked up in the normal TypeIndices map.
DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
/// Complete record types to emit after all active type lowerings are
/// finished.
SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
/// Number of type lowering frames active on the stack.
unsigned TypeEmissionLevel = 0;
codeview::TypeIndex VBPType;
const DISubprogram *CurrentSubprogram = nullptr;
// The UDTs we have seen while processing types; each entry is a pair of type
// index and type name.
std::vector<std::pair<std::string, const DIType *>> LocalUDTs;
std::vector<std::pair<std::string, const DIType *>> GlobalUDTs;
using FileToFilepathMapTy = std::map<const DIFile *, std::string>;
FileToFilepathMapTy FileToFilepathMap;
StringRef getFullFilepath(const DIFile *File);
unsigned maybeRecordFile(const DIFile *F);
void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
void clear();
void setCurrentSubprogram(const DISubprogram *SP) {
CurrentSubprogram = SP;
/// Emit the magic version number at the start of a CodeView type or symbol
/// section. Appears at the front of every .debug$S or .debug$T or .debug$P
/// section.
void emitCodeViewMagicVersion();
void emitTypeInformation();
void emitTypeGlobalHashes();
void emitCompilerInformation();
void emitBuildInfo();
void emitInlineeLinesSubsection();
void emitDebugInfoForThunk(const Function *GV,
FunctionInfo &FI,
const MCSymbol *Fn);
void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
void emitDebugInfoForRetainedTypes();
emitDebugInfoForUDTs(ArrayRef<std::pair<std::string, const DIType *>> UDTs);
void emitDebugInfoForGlobals();
void emitGlobalVariableList(ArrayRef<CVGlobalVariable> Globals);
void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
const GlobalVariable *GV, MCSymbol *GVSym);
/// Opens a subsection of the given kind in a .debug$S codeview section.
/// Returns an end label for use with endCVSubsection when the subsection is
/// finished.
MCSymbol *beginCVSubsection(codeview::DebugSubsectionKind Kind);
void endCVSubsection(MCSymbol *EndLabel);
/// Opens a symbol record of the given kind. Returns an end label for use with
/// endSymbolRecord.
MCSymbol *beginSymbolRecord(codeview::SymbolKind Kind);
void endSymbolRecord(MCSymbol *SymEnd);
/// Emits an S_END, S_INLINESITE_END, or S_PROC_ID_END record. These records
/// are empty, so we emit them with a simpler assembly sequence that doesn't
/// involve labels.
void emitEndSymbolRecord(codeview::SymbolKind EndKind);
void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
const InlineSite &Site);
using InlinedEntity = DbgValueHistoryMap::InlinedEntity;
void collectGlobalVariableInfo();
void collectVariableInfo(const DISubprogram *SP);
void collectVariableInfoFromMFTable(DenseSet<InlinedEntity> &Processed);
// Construct the lexical block tree for a routine, pruning emptpy lexical
// scopes, and populate it with local variables.
void collectLexicalBlockInfo(SmallVectorImpl<LexicalScope *> &Scopes,
SmallVectorImpl<LexicalBlock *> &Blocks,
SmallVectorImpl<LocalVariable> &Locals,
SmallVectorImpl<CVGlobalVariable> &Globals);
void collectLexicalBlockInfo(LexicalScope &Scope,
SmallVectorImpl<LexicalBlock *> &ParentBlocks,
SmallVectorImpl<LocalVariable> &ParentLocals,
SmallVectorImpl<CVGlobalVariable> &ParentGlobals);
/// Records information about a local variable in the appropriate scope. In
/// particular, locals from inlined code live inside the inlining site.
void recordLocalVariable(LocalVariable &&Var, const LexicalScope *LS);
/// Emits local variables in the appropriate order.
void emitLocalVariableList(const FunctionInfo &FI,
ArrayRef<LocalVariable> Locals);
/// Emits an S_LOCAL record and its associated defined ranges.
void emitLocalVariable(const FunctionInfo &FI, const LocalVariable &Var);
/// Emits a sequence of lexical block scopes and their children.
void emitLexicalBlockList(ArrayRef<LexicalBlock *> Blocks,
const FunctionInfo& FI);
/// Emit a lexical block scope and its children.
void emitLexicalBlock(const LexicalBlock &Block, const FunctionInfo& FI);
/// Translates the DIType to codeview if necessary and returns a type index
/// for it.
codeview::TypeIndex getTypeIndex(DITypeRef TypeRef,
DITypeRef ClassTyRef = DITypeRef());
getTypeIndexForThisPtr(const DIDerivedType *PtrTy,
const DISubroutineType *SubroutineTy);
codeview::TypeIndex getTypeIndexForReferenceTo(DITypeRef TypeRef);
codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
const DICompositeType *Class);
codeview::TypeIndex getScopeIndex(const DIScope *Scope);
codeview::TypeIndex getVBPTypeIndex();
void addToUDTs(const DIType *Ty);
void addUDTSrcLine(const DIType *Ty, codeview::TypeIndex TI);
codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
codeview::TypeIndex lowerTypePointer(
const DIDerivedType *Ty,
codeview::PointerOptions PO = codeview::PointerOptions::None);
codeview::TypeIndex lowerTypeMemberPointer(
const DIDerivedType *Ty,
codeview::PointerOptions PO = codeview::PointerOptions::None);
codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeMemberFunction(
const DISubroutineType *Ty, const DIType *ClassTy, int ThisAdjustment,
bool IsStaticMethod,
codeview::FunctionOptions FO = codeview::FunctionOptions::None);
codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
/// Symbol records should point to complete types, but type records should
/// always point to incomplete types to avoid cycles in the type graph. Only
/// use this entry point when generating symbol records. The complete and
/// incomplete type indices only differ for record types. All other types use
/// the same index.
codeview::TypeIndex getCompleteTypeIndex(DITypeRef TypeRef);
codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
struct TypeLoweringScope;
void emitDeferredCompleteTypes();
void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
ClassInfo collectClassInfo(const DICompositeType *Ty);
/// Common record member lowering functionality for record types, which are
/// structs, classes, and unions. Returns the field list index and the member
/// count.
std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
lowerRecordFieldList(const DICompositeType *Ty);
/// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
codeview::TypeIndex TI,
const DIType *ClassTy = nullptr);
unsigned getPointerSizeInBytes();
/// Gather pre-function debug information.
void beginFunctionImpl(const MachineFunction *MF) override;
/// Gather post-function debug information.
void endFunctionImpl(const MachineFunction *) override;
CodeViewDebug(AsmPrinter *AP);
void setSymbolSize(const MCSymbol *, uint64_t) override {}
/// Emit the COFF section that holds the line table information.
void endModule() override;
/// Process beginning of an instruction.
void beginInstruction(const MachineInstr *MI) override;
} // end namespace llvm