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