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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
312 lines
12 KiB
C++
312 lines
12 KiB
C++
//===---- llvm/MDBuilder.cpp - Builder for LLVM metadata ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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, bool Synthetic,
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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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if (Synthetic)
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Ops.push_back(createString("synthetic_function_entry_count"));
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else
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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::createCallbackEncoding(unsigned CalleeArgNo,
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ArrayRef<int> Arguments,
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bool VarArgArePassed) {
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SmallVector<Metadata *, 4> Ops;
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Type *Int64 = Type::getInt64Ty(Context);
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Ops.push_back(createConstant(ConstantInt::get(Int64, CalleeArgNo)));
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for (int ArgNo : Arguments)
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Ops.push_back(createConstant(ConstantInt::get(Int64, ArgNo, true)));
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Type *Int1 = Type::getInt1Ty(Context);
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Ops.push_back(createConstant(ConstantInt::get(Int1, VarArgArePassed)));
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return MDNode::get(Context, Ops);
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}
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MDNode *MDBuilder::mergeCallbackEncodings(MDNode *ExistingCallbacks,
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MDNode *NewCB) {
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if (!ExistingCallbacks)
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return MDNode::get(Context, {NewCB});
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auto *NewCBCalleeIdxAsCM = cast<ConstantAsMetadata>(NewCB->getOperand(0));
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uint64_t NewCBCalleeIdx =
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cast<ConstantInt>(NewCBCalleeIdxAsCM->getValue())->getZExtValue();
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SmallVector<Metadata *, 4> Ops;
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unsigned NumExistingOps = ExistingCallbacks->getNumOperands();
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Ops.resize(NumExistingOps + 1);
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for (unsigned u = 0; u < NumExistingOps; u++) {
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Ops[u] = ExistingCallbacks->getOperand(u);
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auto *OldCBCalleeIdxAsCM = cast<ConstantAsMetadata>(Ops[u]);
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uint64_t OldCBCalleeIdx =
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cast<ConstantInt>(OldCBCalleeIdxAsCM->getValue())->getZExtValue();
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assert(NewCBCalleeIdx != OldCBCalleeIdx &&
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"Cannot map a callback callee index twice!");
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}
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Ops[NumExistingOps] = NewCB;
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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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/// 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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/// 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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/// 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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/// 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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/// 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::createMutableTBAAAccessTag(MDNode *Tag) {
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MDNode *BaseType = cast<MDNode>(Tag->getOperand(0));
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MDNode *AccessType = cast<MDNode>(Tag->getOperand(1));
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Metadata *OffsetNode = Tag->getOperand(2);
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uint64_t Offset = mdconst::extract<ConstantInt>(OffsetNode)->getZExtValue();
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bool NewFormat = isa<MDNode>(AccessType->getOperand(0));
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// See if the tag is already mutable.
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unsigned ImmutabilityFlagOp = NewFormat ? 4 : 3;
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if (Tag->getNumOperands() <= ImmutabilityFlagOp)
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return Tag;
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// If Tag is already mutable then return it.
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Metadata *ImmutabilityFlagNode = Tag->getOperand(ImmutabilityFlagOp);
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if (!mdconst::extract<ConstantInt>(ImmutabilityFlagNode)->getValue())
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return Tag;
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// Otherwise, create another node.
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if (!NewFormat)
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return createTBAAStructTagNode(BaseType, AccessType, Offset);
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Metadata *SizeNode = Tag->getOperand(3);
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uint64_t Size = mdconst::extract<ConstantInt>(SizeNode)->getZExtValue();
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return createTBAAAccessTag(BaseType, AccessType, Offset, Size);
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}
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MDNode *MDBuilder::createIrrLoopHeaderWeight(uint64_t Weight) {
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Metadata *Vals[] = {
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createString("loop_header_weight"),
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createConstant(ConstantInt::get(Type::getInt64Ty(Context), Weight)),
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};
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return MDNode::get(Context, Vals);
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}
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