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Diffstat (limited to 'contrib/llvm/lib/IR/MDBuilder.cpp')
| -rw-r--r-- | contrib/llvm/lib/IR/MDBuilder.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/contrib/llvm/lib/IR/MDBuilder.cpp b/contrib/llvm/lib/IR/MDBuilder.cpp new file mode 100644 index 000000000000..b4c5ca7c6a12 --- /dev/null +++ b/contrib/llvm/lib/IR/MDBuilder.cpp @@ -0,0 +1,183 @@ +//===---- llvm/MDBuilder.cpp - Builder for LLVM metadata ------------------===// +// +// 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. +// +//===----------------------------------------------------------------------===// + +#include "llvm/IR/MDBuilder.h" +#include "llvm/IR/Constants.h" +#include "llvm/IR/Metadata.h" +using namespace llvm; + +MDString *MDBuilder::createString(StringRef Str) { + return MDString::get(Context, Str); +} + +ConstantAsMetadata *MDBuilder::createConstant(Constant *C) { + return ConstantAsMetadata::get(C); +} + +MDNode *MDBuilder::createFPMath(float Accuracy) { + if (Accuracy == 0.0) + return nullptr; + assert(Accuracy > 0.0 && "Invalid fpmath accuracy!"); + auto *Op = + createConstant(ConstantFP::get(Type::getFloatTy(Context), Accuracy)); + return MDNode::get(Context, Op); +} + +MDNode *MDBuilder::createBranchWeights(uint32_t TrueWeight, + uint32_t FalseWeight) { + uint32_t Weights[] = {TrueWeight, FalseWeight}; + return createBranchWeights(Weights); +} + +MDNode *MDBuilder::createBranchWeights(ArrayRef<uint32_t> Weights) { + assert(Weights.size() >= 2 && "Need at least two branch weights!"); + + SmallVector<Metadata *, 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] = createConstant(ConstantInt::get(Int32Ty, Weights[i])); + + return MDNode::get(Context, Vals); +} + +MDNode *MDBuilder::createFunctionEntryCount(uint64_t Count) { + SmallVector<Metadata *, 2> Vals(2); + Vals[0] = createString("function_entry_count"); + + Type *Int64Ty = Type::getInt64Ty(Context); + Vals[1] = createConstant(ConstantInt::get(Int64Ty, Count)); + + return MDNode::get(Context, Vals); +} + +MDNode *MDBuilder::createRange(const APInt &Lo, const APInt &Hi) { + assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!"); + + Type *Ty = IntegerType::get(Context, Lo.getBitWidth()); + return createRange(ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi)); +} + +MDNode *MDBuilder::createRange(Constant *Lo, Constant *Hi) { + // If the range is everything then it is useless. + if (Hi == Lo) + return nullptr; + + // Return the range [Lo, Hi). + Metadata *Range[2] = {createConstant(Lo), createConstant(Hi)}; + return MDNode::get(Context, Range); +} + +MDNode *MDBuilder::createAnonymousAARoot(StringRef Name, MDNode *Extra) { + // To ensure uniqueness the root node is self-referential. + auto Dummy = MDNode::getTemporary(Context, None); + + SmallVector<Metadata *, 3> Args(1, Dummy.get()); + if (Extra) + Args.push_back(Extra); + if (!Name.empty()) + Args.push_back(createString(Name)); + MDNode *Root = MDNode::get(Context, Args); + + // 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); + + // We now have + // !1 = metadata !{metadata !1} <- self-referential root + return Root; +} + +MDNode *MDBuilder::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 *MDBuilder::createTBAANode(StringRef Name, MDNode *Parent, + bool isConstant) { + if (isConstant) { + Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1); + Metadata *Ops[3] = {createString(Name), Parent, createConstant(Flags)}; + return MDNode::get(Context, Ops); + } else { + Metadata *Ops[2] = {createString(Name), Parent}; + return MDNode::get(Context, Ops); + } +} + +MDNode *MDBuilder::createAliasScopeDomain(StringRef Name) { + return MDNode::get(Context, createString(Name)); +} + +MDNode *MDBuilder::createAliasScope(StringRef Name, MDNode *Domain) { + Metadata *Ops[2] = {createString(Name), Domain}; + return MDNode::get(Context, Ops); +} + +/// \brief Return metadata for a tbaa.struct node with the given +/// struct field descriptions. +MDNode *MDBuilder::createTBAAStructNode(ArrayRef<TBAAStructField> Fields) { + SmallVector<Metadata *, 4> Vals(Fields.size() * 3); + Type *Int64 = Type::getInt64Ty(Context); + for (unsigned i = 0, e = Fields.size(); i != e; ++i) { + Vals[i * 3 + 0] = createConstant(ConstantInt::get(Int64, Fields[i].Offset)); + Vals[i * 3 + 1] = createConstant(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 *MDBuilder::createTBAAStructTypeNode( + StringRef Name, ArrayRef<std::pair<MDNode *, uint64_t>> Fields) { + SmallVector<Metadata *, 4> Ops(Fields.size() * 2 + 1); + Type *Int64 = Type::getInt64Ty(Context); + 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] = createConstant(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 *MDBuilder::createTBAAScalarTypeNode(StringRef Name, MDNode *Parent, + uint64_t Offset) { + ConstantInt *Off = ConstantInt::get(Type::getInt64Ty(Context), Offset); + Metadata *Ops[3] = {createString(Name), Parent, createConstant(Off)}; + 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 *MDBuilder::createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType, + uint64_t Offset, bool IsConstant) { + Type *Int64 = Type::getInt64Ty(Context); + if (IsConstant) { + Metadata *Ops[4] = {BaseType, AccessType, + createConstant(ConstantInt::get(Int64, Offset)), + createConstant(ConstantInt::get(Int64, 1))}; + return MDNode::get(Context, Ops); + } else { + Metadata *Ops[3] = {BaseType, AccessType, + createConstant(ConstantInt::get(Int64, Offset))}; + return MDNode::get(Context, Ops); + } +} |