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3b753d324c
The new helpers are supposed to be used in clang to generate TBAA information in the new format proposed in this thread: http://lists.llvm.org/pipermail/llvm-dev/2017-November/118748.html Differential Revision: https://reviews.llvm.org/D39956 llvm-svn: 320993
237 lines
8.9 KiB
C++
237 lines
8.9 KiB
C++
//===---- 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/Function.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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ConstantAsMetadata *MDBuilder::createConstant(Constant *C) {
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return ConstantAsMetadata::get(C);
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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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auto *Op =
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createConstant(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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return createBranchWeights({TrueWeight, FalseWeight});
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}
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MDNode *MDBuilder::createBranchWeights(ArrayRef<uint32_t> Weights) {
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assert(Weights.size() >= 1 && "Need at least one branch weights!");
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SmallVector<Metadata *, 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] = createConstant(ConstantInt::get(Int32Ty, Weights[i]));
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return MDNode::get(Context, Vals);
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}
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MDNode *MDBuilder::createUnpredictable() {
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return MDNode::get(Context, None);
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}
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MDNode *MDBuilder::createFunctionEntryCount(
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uint64_t Count, const DenseSet<GlobalValue::GUID> *Imports) {
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Type *Int64Ty = Type::getInt64Ty(Context);
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SmallVector<Metadata *, 8> Ops;
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Ops.push_back(createString("function_entry_count"));
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Ops.push_back(createConstant(ConstantInt::get(Int64Ty, Count)));
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if (Imports) {
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SmallVector<GlobalValue::GUID, 2> OrderID(Imports->begin(), Imports->end());
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std::stable_sort(OrderID.begin(), OrderID.end(),
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[] (GlobalValue::GUID A, GlobalValue::GUID B) {
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return A < B;});
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for (auto ID : OrderID)
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Ops.push_back(createConstant(ConstantInt::get(Int64Ty, ID)));
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}
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return MDNode::get(Context, Ops);
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}
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MDNode *MDBuilder::createFunctionSectionPrefix(StringRef Prefix) {
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return MDNode::get(Context,
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{createString("function_section_prefix"),
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createString(Prefix)});
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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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Type *Ty = IntegerType::get(Context, Lo.getBitWidth());
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return createRange(ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi));
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}
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MDNode *MDBuilder::createRange(Constant *Lo, Constant *Hi) {
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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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return MDNode::get(Context, {createConstant(Lo), createConstant(Hi)});
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}
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MDNode *MDBuilder::createCallees(ArrayRef<Function *> Callees) {
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SmallVector<Metadata *, 4> Ops;
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for (Function *F : Callees)
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Ops.push_back(createConstant(F));
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return MDNode::get(Context, Ops);
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}
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MDNode *MDBuilder::createAnonymousAARoot(StringRef Name, MDNode *Extra) {
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// To ensure uniqueness the root node is self-referential.
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auto Dummy = MDNode::getTemporary(Context, None);
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SmallVector<Metadata *, 3> Args(1, Dummy.get());
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if (Extra)
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Args.push_back(Extra);
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if (!Name.empty())
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Args.push_back(createString(Name));
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MDNode *Root = MDNode::get(Context, Args);
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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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// 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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return MDNode::get(Context,
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{createString(Name), Parent, createConstant(Flags)});
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}
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return MDNode::get(Context, {createString(Name), Parent});
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}
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MDNode *MDBuilder::createAliasScopeDomain(StringRef Name) {
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return MDNode::get(Context, createString(Name));
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}
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MDNode *MDBuilder::createAliasScope(StringRef Name, MDNode *Domain) {
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return MDNode::get(Context, {createString(Name), Domain});
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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<Metadata *, 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] = createConstant(ConstantInt::get(Int64, Fields[i].Offset));
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Vals[i * 3 + 1] = createConstant(ConstantInt::get(Int64, Fields[i].Size));
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Vals[i * 3 + 2] = Fields[i].Type;
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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<Metadata *, 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] = createConstant(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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return MDNode::get(Context,
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{createString(Name), Parent, createConstant(Off)});
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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, bool IsConstant) {
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IntegerType *Int64 = Type::getInt64Ty(Context);
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ConstantInt *Off = ConstantInt::get(Int64, Offset);
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if (IsConstant) {
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return MDNode::get(Context, {BaseType, AccessType, createConstant(Off),
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createConstant(ConstantInt::get(Int64, 1))});
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}
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return MDNode::get(Context, {BaseType, AccessType, createConstant(Off)});
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}
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MDNode *MDBuilder::createTBAATypeNode(MDNode *Parent, uint64_t Size,
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Metadata *Id,
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ArrayRef<TBAAStructField> Fields) {
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SmallVector<Metadata *, 4> Ops(3 + Fields.size() * 3);
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Type *Int64 = Type::getInt64Ty(Context);
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Ops[0] = Parent;
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Ops[1] = createConstant(ConstantInt::get(Int64, Size));
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Ops[2] = Id;
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for (unsigned I = 0, E = Fields.size(); I != E; ++I) {
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Ops[I * 3 + 3] = Fields[I].Type;
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Ops[I * 3 + 4] = createConstant(ConstantInt::get(Int64, Fields[I].Offset));
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Ops[I * 3 + 5] = createConstant(ConstantInt::get(Int64, Fields[I].Size));
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}
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return MDNode::get(Context, Ops);
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}
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MDNode *MDBuilder::createTBAAAccessTag(MDNode *BaseType, MDNode *AccessType,
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uint64_t Offset, uint64_t Size,
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bool IsImmutable) {
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IntegerType *Int64 = Type::getInt64Ty(Context);
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auto *OffsetNode = createConstant(ConstantInt::get(Int64, Offset));
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auto *SizeNode = createConstant(ConstantInt::get(Int64, Size));
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if (IsImmutable) {
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auto *ImmutabilityFlagNode = createConstant(ConstantInt::get(Int64, 1));
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return MDNode::get(Context, {BaseType, AccessType, OffsetNode, SizeNode,
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ImmutabilityFlagNode});
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}
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return MDNode::get(Context, {BaseType, AccessType, OffsetNode, SizeNode});
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}
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MDNode *MDBuilder::createIrrLoopHeaderWeight(uint64_t Weight) {
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SmallVector<Metadata *, 2> Vals(2);
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Vals[0] = createString("loop_header_weight");
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Vals[1] = createConstant(ConstantInt::get(Type::getInt64Ty(Context), Weight));
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return MDNode::get(Context, Vals);
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}
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