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//===---- 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/Function.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) {
return createBranchWeights({TrueWeight, FalseWeight});
}
MDNode *MDBuilder::createBranchWeights(ArrayRef<uint32_t> Weights) {
assert(Weights.size() >= 1 && "Need at least one 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::createUnpredictable() {
return MDNode::get(Context, None);
}
MDNode *MDBuilder::createFunctionEntryCount(
uint64_t Count, const DenseSet<GlobalValue::GUID> *Imports) {
Type *Int64Ty = Type::getInt64Ty(Context);
SmallVector<Metadata *, 8> Ops;
Ops.push_back(createString("function_entry_count"));
Ops.push_back(createConstant(ConstantInt::get(Int64Ty, Count)));
if (Imports) {
SmallVector<GlobalValue::GUID, 2> OrderID(Imports->begin(), Imports->end());
std::stable_sort(OrderID.begin(), OrderID.end(),
[] (GlobalValue::GUID A, GlobalValue::GUID B) {
return A < B;});
for (auto ID : OrderID)
Ops.push_back(createConstant(ConstantInt::get(Int64Ty, ID)));
}
return MDNode::get(Context, Ops);
}
MDNode *MDBuilder::createFunctionSectionPrefix(StringRef Prefix) {
return MDNode::get(Context,
{createString("function_section_prefix"),
createString(Prefix)});
}
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).
return MDNode::get(Context, {createConstant(Lo), createConstant(Hi)});
}
MDNode *MDBuilder::createCallees(ArrayRef<Function *> Callees) {
SmallVector<Metadata *, 4> Ops;
for (Function *F : Callees)
Ops.push_back(createConstant(F));
return MDNode::get(Context, Ops);
}
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);
return MDNode::get(Context,
{createString(Name), Parent, createConstant(Flags)});
}
return MDNode::get(Context, {createString(Name), Parent});
}
MDNode *MDBuilder::createAliasScopeDomain(StringRef Name) {
return MDNode::get(Context, createString(Name));
}
MDNode *MDBuilder::createAliasScope(StringRef Name, MDNode *Domain) {
return MDNode::get(Context, {createString(Name), Domain});
}
/// \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].Type;
}
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);
return MDNode::get(Context,
{createString(Name), Parent, createConstant(Off)});
}
/// \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) {
IntegerType *Int64 = Type::getInt64Ty(Context);
ConstantInt *Off = ConstantInt::get(Int64, Offset);
if (IsConstant) {
return MDNode::get(Context, {BaseType, AccessType, createConstant(Off),
createConstant(ConstantInt::get(Int64, 1))});
}
return MDNode::get(Context, {BaseType, AccessType, createConstant(Off)});
}
MDNode *MDBuilder::createTBAATypeNode(MDNode *Parent, uint64_t Size,
Metadata *Id,
ArrayRef<TBAAStructField> Fields) {
SmallVector<Metadata *, 4> Ops(3 + Fields.size() * 3);
Type *Int64 = Type::getInt64Ty(Context);
Ops[0] = Parent;
Ops[1] = createConstant(ConstantInt::get(Int64, Size));
Ops[2] = Id;
for (unsigned I = 0, E = Fields.size(); I != E; ++I) {
Ops[I * 3 + 3] = Fields[I].Type;
Ops[I * 3 + 4] = createConstant(ConstantInt::get(Int64, Fields[I].Offset));
Ops[I * 3 + 5] = createConstant(ConstantInt::get(Int64, Fields[I].Size));
}
return MDNode::get(Context, Ops);
}
MDNode *MDBuilder::createTBAAAccessTag(MDNode *BaseType, MDNode *AccessType,
uint64_t Offset, uint64_t Size,
bool IsImmutable) {
IntegerType *Int64 = Type::getInt64Ty(Context);
auto *OffsetNode = createConstant(ConstantInt::get(Int64, Offset));
auto *SizeNode = createConstant(ConstantInt::get(Int64, Size));
if (IsImmutable) {
auto *ImmutabilityFlagNode = createConstant(ConstantInt::get(Int64, 1));
return MDNode::get(Context, {BaseType, AccessType, OffsetNode, SizeNode,
ImmutabilityFlagNode});
}
return MDNode::get(Context, {BaseType, AccessType, OffsetNode, SizeNode});
}
MDNode *MDBuilder::createIrrLoopHeaderWeight(uint64_t Weight) {
SmallVector<Metadata *, 2> Vals(2);
Vals[0] = createString("loop_header_weight");
Vals[1] = createConstant(ConstantInt::get(Type::getInt64Ty(Context), Weight));
return MDNode::get(Context, Vals);
}
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