| //===---- llvm/MDBuilder.h - Builder for LLVM metadata ----------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the MDBuilder class, which is used as a convenient way to |
| // create LLVM metadata with a consistent and simplified interface. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_IR_MDBUILDER_H |
| #define LLVM_IR_MDBUILDER_H |
| |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/DerivedTypes.h" |
| #include "llvm/IR/Metadata.h" |
| |
| namespace llvm { |
| |
| class APInt; |
| class LLVMContext; |
| |
| class MDBuilder { |
| LLVMContext &Context; |
| |
| public: |
| MDBuilder(LLVMContext &context) : Context(context) {} |
| |
| /// \brief Return the given string as metadata. |
| MDString *createString(StringRef Str) { |
| return MDString::get(Context, Str); |
| } |
| |
| //===------------------------------------------------------------------===// |
| // FPMath metadata. |
| //===------------------------------------------------------------------===// |
| |
| /// \brief Return metadata with the given settings. The special value 0.0 |
| /// for the Accuracy parameter indicates the default (maximal precision) |
| /// setting. |
| MDNode *createFPMath(float Accuracy) { |
| if (Accuracy == 0.0) |
| return 0; |
| assert(Accuracy > 0.0 && "Invalid fpmath accuracy!"); |
| Value *Op = ConstantFP::get(Type::getFloatTy(Context), Accuracy); |
| return MDNode::get(Context, Op); |
| } |
| |
| //===------------------------------------------------------------------===// |
| // Prof metadata. |
| //===------------------------------------------------------------------===// |
| |
| /// \brief Return metadata containing two branch weights. |
| MDNode *createBranchWeights(uint32_t TrueWeight, uint32_t FalseWeight) { |
| uint32_t Weights[] = { TrueWeight, FalseWeight }; |
| return createBranchWeights(Weights); |
| } |
| |
| /// \brief Return metadata containing a number of branch weights. |
| MDNode *createBranchWeights(ArrayRef<uint32_t> Weights) { |
| assert(Weights.size() >= 2 && "Need at least two branch weights!"); |
| |
| SmallVector<Value *, 4> Vals(Weights.size()+1); |
| Vals[0] = createString("branch_weights"); |
| |
| Type *Int32Ty = Type::getInt32Ty(Context); |
| for (unsigned i = 0, e = Weights.size(); i != e; ++i) |
| Vals[i+1] = ConstantInt::get(Int32Ty, Weights[i]); |
| |
| return MDNode::get(Context, Vals); |
| } |
| |
| //===------------------------------------------------------------------===// |
| // Range metadata. |
| //===------------------------------------------------------------------===// |
| |
| /// \brief Return metadata describing the range [Lo, Hi). |
| MDNode *createRange(const APInt &Lo, const APInt &Hi) { |
| assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!"); |
| // If the range is everything then it is useless. |
| if (Hi == Lo) |
| return 0; |
| |
| // Return the range [Lo, Hi). |
| Type *Ty = IntegerType::get(Context, Lo.getBitWidth()); |
| Value *Range[2] = { ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi) }; |
| return MDNode::get(Context, Range); |
| } |
| |
| |
| //===------------------------------------------------------------------===// |
| // TBAA metadata. |
| //===------------------------------------------------------------------===// |
| |
| /// \brief Return metadata appropriate for a TBAA root node. Each returned |
| /// node is distinct from all other metadata and will never be identified |
| /// (uniqued) with anything else. |
| MDNode *createAnonymousTBAARoot() { |
| // To ensure uniqueness the root node is self-referential. |
| MDNode *Dummy = MDNode::getTemporary(Context, ArrayRef<Value*>()); |
| MDNode *Root = MDNode::get(Context, Dummy); |
| // At this point we have |
| // !0 = metadata !{} <- dummy |
| // !1 = metadata !{metadata !0} <- root |
| // Replace the dummy operand with the root node itself and delete the dummy. |
| Root->replaceOperandWith(0, Root); |
| MDNode::deleteTemporary(Dummy); |
| // We now have |
| // !1 = metadata !{metadata !1} <- self-referential root |
| return Root; |
| } |
| |
| /// \brief Return metadata appropriate for a TBAA root node with the given |
| /// name. This may be identified (uniqued) with other roots with the same |
| /// name. |
| MDNode *createTBAARoot(StringRef Name) { |
| return MDNode::get(Context, createString(Name)); |
| } |
| |
| /// \brief Return metadata for a non-root TBAA node with the given name, |
| /// parent in the TBAA tree, and value for 'pointsToConstantMemory'. |
| MDNode *createTBAANode(StringRef Name, MDNode *Parent, |
| bool isConstant = false) { |
| if (isConstant) { |
| Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1); |
| Value *Ops[3] = { createString(Name), Parent, Flags }; |
| return MDNode::get(Context, Ops); |
| } else { |
| Value *Ops[2] = { createString(Name), Parent }; |
| return MDNode::get(Context, Ops); |
| } |
| } |
| |
| struct TBAAStructField { |
| uint64_t Offset; |
| uint64_t Size; |
| MDNode *TBAA; |
| TBAAStructField(uint64_t Offset, uint64_t Size, MDNode *TBAA) : |
| Offset(Offset), Size(Size), TBAA(TBAA) {} |
| }; |
| |
| /// \brief Return metadata for a tbaa.struct node with the given |
| /// struct field descriptions. |
| MDNode *createTBAAStructNode(ArrayRef<TBAAStructField> Fields) { |
| SmallVector<Value *, 4> Vals(Fields.size() * 3); |
| Type *Int64 = IntegerType::get(Context, 64); |
| for (unsigned i = 0, e = Fields.size(); i != e; ++i) { |
| Vals[i * 3 + 0] = ConstantInt::get(Int64, Fields[i].Offset); |
| Vals[i * 3 + 1] = ConstantInt::get(Int64, Fields[i].Size); |
| Vals[i * 3 + 2] = Fields[i].TBAA; |
| } |
| return MDNode::get(Context, Vals); |
| } |
| |
| /// \brief Return metadata for a TBAA struct node in the type DAG |
| /// with the given name, a list of pairs (offset, field type in the type DAG). |
| MDNode *createTBAAStructTypeNode(StringRef Name, |
| ArrayRef<std::pair<MDNode*, uint64_t> > Fields) { |
| SmallVector<Value *, 4> Ops(Fields.size() * 2 + 1); |
| Type *Int64 = IntegerType::get(Context, 64); |
| Ops[0] = createString(Name); |
| for (unsigned i = 0, e = Fields.size(); i != e; ++i) { |
| Ops[i * 2 + 1] = Fields[i].first; |
| Ops[i * 2 + 2] = ConstantInt::get(Int64, Fields[i].second); |
| } |
| return MDNode::get(Context, Ops); |
| } |
| |
| /// \brief Return metadata for a TBAA scalar type node with the |
| /// given name, an offset and a parent in the TBAA type DAG. |
| MDNode *createTBAAScalarTypeNode(StringRef Name, MDNode *Parent, |
| uint64_t Offset = 0) { |
| SmallVector<Value *, 4> Ops(3); |
| Type *Int64 = IntegerType::get(Context, 64); |
| Ops[0] = createString(Name); |
| Ops[1] = Parent; |
| Ops[2] = ConstantInt::get(Int64, Offset); |
| return MDNode::get(Context, Ops); |
| } |
| |
| /// \brief Return metadata for a TBAA tag node with the given |
| /// base type, access type and offset relative to the base type. |
| MDNode *createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType, |
| uint64_t Offset) { |
| Type *Int64 = IntegerType::get(Context, 64); |
| Value *Ops[3] = { BaseType, AccessType, ConstantInt::get(Int64, Offset) }; |
| return MDNode::get(Context, Ops); |
| } |
| |
| }; |
| |
| } // end namespace llvm |
| |
| #endif |