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312 lines
11 KiB
C++
312 lines
11 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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llvm::stable_sort(OrderID);
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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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(void)NewCBCalleeIdx;
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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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(void)OldCBCalleeIdx;
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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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