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350 lines
11 KiB
C++
350 lines
11 KiB
C++
//===- ValueMapper.cpp - Unit tests for ValueMapper -----------------------===//
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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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#include "llvm/Transforms/Utils/ValueMapper.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/GlobalVariable.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Metadata.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(ValueMapperTest, mapMDNode) {
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LLVMContext Context;
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auto *U = MDTuple::get(Context, None);
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// The node should be unchanged.
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ValueToValueMapTy VM;
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EXPECT_EQ(U, ValueMapper(VM).mapMDNode(*U));
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}
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TEST(ValueMapperTest, mapMDNodeCycle) {
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LLVMContext Context;
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MDNode *U0;
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MDNode *U1;
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{
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Metadata *Ops[] = {nullptr};
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auto T = MDTuple::getTemporary(Context, Ops);
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Ops[0] = T.get();
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U0 = MDTuple::get(Context, Ops);
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T->replaceOperandWith(0, U0);
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U1 = MDNode::replaceWithUniqued(std::move(T));
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U0->resolveCycles();
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}
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EXPECT_TRUE(U0->isResolved());
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EXPECT_TRUE(U0->isUniqued());
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EXPECT_TRUE(U1->isResolved());
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EXPECT_TRUE(U1->isUniqued());
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EXPECT_EQ(U1, U0->getOperand(0));
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EXPECT_EQ(U0, U1->getOperand(0));
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// Cycles shouldn't be duplicated.
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{
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ValueToValueMapTy VM;
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EXPECT_EQ(U0, ValueMapper(VM).mapMDNode(*U0));
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EXPECT_EQ(U1, ValueMapper(VM).mapMDNode(*U1));
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}
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// Check the other order.
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{
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ValueToValueMapTy VM;
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EXPECT_EQ(U1, ValueMapper(VM).mapMDNode(*U1));
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EXPECT_EQ(U0, ValueMapper(VM).mapMDNode(*U0));
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}
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}
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TEST(ValueMapperTest, mapMDNodeDuplicatedCycle) {
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LLVMContext Context;
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auto *PtrTy = Type::getInt8Ty(Context)->getPointerTo();
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std::unique_ptr<GlobalVariable> G0 = llvm::make_unique<GlobalVariable>(
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PtrTy, false, GlobalValue::ExternalLinkage, nullptr, "G0");
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std::unique_ptr<GlobalVariable> G1 = llvm::make_unique<GlobalVariable>(
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PtrTy, false, GlobalValue::ExternalLinkage, nullptr, "G1");
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// Create a cycle that references G0.
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MDNode *N0; // !0 = !{!1}
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MDNode *N1; // !1 = !{!0, i8* @G0}
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{
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auto T0 = MDTuple::getTemporary(Context, nullptr);
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Metadata *Ops1[] = {T0.get(), ConstantAsMetadata::get(G0.get())};
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N1 = MDTuple::get(Context, Ops1);
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T0->replaceOperandWith(0, N1);
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N0 = MDNode::replaceWithUniqued(std::move(T0));
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}
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// Resolve N0 and N1.
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ASSERT_FALSE(N0->isResolved());
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ASSERT_FALSE(N1->isResolved());
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N0->resolveCycles();
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ASSERT_TRUE(N0->isResolved());
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ASSERT_TRUE(N1->isResolved());
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// Seed the value map to map G0 to G1 and map the nodes. The output should
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// have new nodes that reference G1 (instead of G0).
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ValueToValueMapTy VM;
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VM[G0.get()] = G1.get();
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MDNode *MappedN0 = ValueMapper(VM).mapMDNode(*N0);
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MDNode *MappedN1 = ValueMapper(VM).mapMDNode(*N1);
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EXPECT_NE(N0, MappedN0);
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EXPECT_NE(N1, MappedN1);
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EXPECT_EQ(ConstantAsMetadata::get(G1.get()), MappedN1->getOperand(1));
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// Check that the output nodes are resolved.
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EXPECT_TRUE(MappedN0->isResolved());
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EXPECT_TRUE(MappedN1->isResolved());
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}
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TEST(ValueMapperTest, mapMDNodeUnresolved) {
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LLVMContext Context;
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TempMDTuple T = MDTuple::getTemporary(Context, None);
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ValueToValueMapTy VM;
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EXPECT_EQ(T.get(), ValueMapper(VM, RF_NoModuleLevelChanges).mapMDNode(*T));
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}
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TEST(ValueMapperTest, mapMDNodeDistinct) {
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LLVMContext Context;
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auto *D = MDTuple::getDistinct(Context, None);
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{
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// The node should be cloned.
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ValueToValueMapTy VM;
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EXPECT_NE(D, ValueMapper(VM).mapMDNode(*D));
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}
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{
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// The node should be moved.
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ValueToValueMapTy VM;
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EXPECT_EQ(D, ValueMapper(VM, RF_MoveDistinctMDs).mapMDNode(*D));
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}
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}
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TEST(ValueMapperTest, mapMDNodeDistinctOperands) {
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LLVMContext Context;
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Metadata *Old = MDTuple::getDistinct(Context, None);
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auto *D = MDTuple::getDistinct(Context, Old);
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ASSERT_EQ(Old, D->getOperand(0));
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Metadata *New = MDTuple::getDistinct(Context, None);
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ValueToValueMapTy VM;
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VM.MD()[Old].reset(New);
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// Make sure operands are updated.
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EXPECT_EQ(D, ValueMapper(VM, RF_MoveDistinctMDs).mapMDNode(*D));
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EXPECT_EQ(New, D->getOperand(0));
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}
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TEST(ValueMapperTest, mapMDNodeSeeded) {
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LLVMContext Context;
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auto *D = MDTuple::getDistinct(Context, None);
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// The node should be moved.
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ValueToValueMapTy VM;
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EXPECT_EQ(None, VM.getMappedMD(D));
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VM.MD().insert(std::make_pair(D, TrackingMDRef(D)));
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EXPECT_EQ(D, *VM.getMappedMD(D));
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EXPECT_EQ(D, ValueMapper(VM).mapMDNode(*D));
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}
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TEST(ValueMapperTest, mapMDNodeSeededWithNull) {
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LLVMContext Context;
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auto *D = MDTuple::getDistinct(Context, None);
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// The node should be moved.
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ValueToValueMapTy VM;
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EXPECT_EQ(None, VM.getMappedMD(D));
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VM.MD().insert(std::make_pair(D, TrackingMDRef()));
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EXPECT_EQ(nullptr, *VM.getMappedMD(D));
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EXPECT_EQ(nullptr, ValueMapper(VM).mapMDNode(*D));
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}
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TEST(ValueMapperTest, mapMetadataNullMapGlobalWithIgnoreMissingLocals) {
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LLVMContext C;
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(C), Type::getInt8Ty(C), false);
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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ValueToValueMapTy VM;
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RemapFlags Flags = RF_IgnoreMissingLocals | RF_NullMapMissingGlobalValues;
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EXPECT_EQ(nullptr, ValueMapper(VM, Flags).mapValue(*F));
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}
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TEST(ValueMapperTest, mapMetadataMDString) {
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LLVMContext C;
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auto *S1 = MDString::get(C, "S1");
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ValueToValueMapTy VM;
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// Make sure S1 maps to itself, but isn't memoized.
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EXPECT_EQ(S1, ValueMapper(VM).mapMetadata(*S1));
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EXPECT_EQ(None, VM.getMappedMD(S1));
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// We still expect VM.MD() to be respected.
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auto *S2 = MDString::get(C, "S2");
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VM.MD()[S1].reset(S2);
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EXPECT_EQ(S2, ValueMapper(VM).mapMetadata(*S1));
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}
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TEST(ValueMapperTest, mapMetadataGetMappedMD) {
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LLVMContext C;
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auto *N0 = MDTuple::get(C, None);
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auto *N1 = MDTuple::get(C, N0);
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// Make sure hasMD and getMappedMD work correctly.
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ValueToValueMapTy VM;
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EXPECT_FALSE(VM.hasMD());
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EXPECT_EQ(N0, ValueMapper(VM).mapMetadata(*N0));
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EXPECT_EQ(N1, ValueMapper(VM).mapMetadata(*N1));
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EXPECT_TRUE(VM.hasMD());
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ASSERT_NE(None, VM.getMappedMD(N0));
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ASSERT_NE(None, VM.getMappedMD(N1));
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EXPECT_EQ(N0, *VM.getMappedMD(N0));
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EXPECT_EQ(N1, *VM.getMappedMD(N1));
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}
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TEST(ValueMapperTest, mapMetadataNoModuleLevelChanges) {
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LLVMContext C;
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auto *N0 = MDTuple::get(C, None);
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auto *N1 = MDTuple::get(C, N0);
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// Nothing should be memoized when RF_NoModuleLevelChanges.
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ValueToValueMapTy VM;
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EXPECT_FALSE(VM.hasMD());
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EXPECT_EQ(N0, ValueMapper(VM, RF_NoModuleLevelChanges).mapMetadata(*N0));
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EXPECT_EQ(N1, ValueMapper(VM, RF_NoModuleLevelChanges).mapMetadata(*N1));
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EXPECT_FALSE(VM.hasMD());
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EXPECT_EQ(None, VM.getMappedMD(N0));
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EXPECT_EQ(None, VM.getMappedMD(N1));
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}
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TEST(ValueMapperTest, mapMetadataConstantAsMetadata) {
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LLVMContext C;
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(C), Type::getInt8Ty(C), false);
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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auto *CAM = ConstantAsMetadata::get(F.get());
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{
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// ConstantAsMetadata shouldn't be memoized.
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ValueToValueMapTy VM;
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EXPECT_EQ(CAM, ValueMapper(VM).mapMetadata(*CAM));
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EXPECT_FALSE(VM.MD().count(CAM));
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EXPECT_EQ(CAM, ValueMapper(VM, RF_IgnoreMissingLocals).mapMetadata(*CAM));
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EXPECT_FALSE(VM.MD().count(CAM));
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// But it should respect a mapping that gets seeded.
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auto *N = MDTuple::get(C, None);
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VM.MD()[CAM].reset(N);
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EXPECT_EQ(N, ValueMapper(VM).mapMetadata(*CAM));
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EXPECT_EQ(N, ValueMapper(VM, RF_IgnoreMissingLocals).mapMetadata(*CAM));
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}
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std::unique_ptr<Function> F2(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F2"));
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ValueToValueMapTy VM;
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VM[F.get()] = F2.get();
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auto *F2MD = ValueMapper(VM).mapMetadata(*CAM);
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EXPECT_FALSE(VM.MD().count(CAM));
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EXPECT_TRUE(F2MD);
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EXPECT_EQ(F2.get(), cast<ConstantAsMetadata>(F2MD)->getValue());
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}
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#ifdef GTEST_HAS_DEATH_TEST
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#ifndef NDEBUG
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TEST(ValueMapperTest, mapMetadataLocalAsMetadata) {
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LLVMContext C;
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(C), Type::getInt8Ty(C), false);
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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Argument &A = *F->arg_begin();
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// mapMetadata doesn't support LocalAsMetadata. The only valid container for
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// LocalAsMetadata is a MetadataAsValue instance, so use it directly.
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auto *LAM = LocalAsMetadata::get(&A);
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ValueToValueMapTy VM;
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EXPECT_DEATH(ValueMapper(VM).mapMetadata(*LAM), "Unexpected local metadata");
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EXPECT_DEATH(ValueMapper(VM, RF_IgnoreMissingLocals).mapMetadata(*LAM),
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"Unexpected local metadata");
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}
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#endif
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#endif
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TEST(ValueMapperTest, mapValueLocalAsMetadata) {
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LLVMContext C;
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(C), Type::getInt8Ty(C), false);
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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Argument &A = *F->arg_begin();
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auto *LAM = LocalAsMetadata::get(&A);
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auto *MAV = MetadataAsValue::get(C, LAM);
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// The principled answer to a LocalAsMetadata of an unmapped SSA value would
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// be to return nullptr (regardless of RF_IgnoreMissingLocals).
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//
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// However, algorithms that use RemapInstruction assume that each instruction
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// only references SSA values from previous instructions. Arguments of
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// such as "metadata i32 %x" don't currently successfully maintain that
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// property. To keep RemapInstruction from crashing we need a non-null
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// return here, but we also shouldn't reference the unmapped local. Use
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// "metadata !{}".
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auto *N0 = MDTuple::get(C, None);
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auto *N0AV = MetadataAsValue::get(C, N0);
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ValueToValueMapTy VM;
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EXPECT_EQ(N0AV, ValueMapper(VM).mapValue(*MAV));
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EXPECT_EQ(nullptr, ValueMapper(VM, RF_IgnoreMissingLocals).mapValue(*MAV));
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EXPECT_FALSE(VM.count(MAV));
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EXPECT_FALSE(VM.count(&A));
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EXPECT_EQ(None, VM.getMappedMD(LAM));
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VM[MAV] = MAV;
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EXPECT_EQ(MAV, ValueMapper(VM).mapValue(*MAV));
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EXPECT_EQ(MAV, ValueMapper(VM, RF_IgnoreMissingLocals).mapValue(*MAV));
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EXPECT_TRUE(VM.count(MAV));
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EXPECT_FALSE(VM.count(&A));
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VM[MAV] = &A;
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EXPECT_EQ(&A, ValueMapper(VM).mapValue(*MAV));
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EXPECT_EQ(&A, ValueMapper(VM, RF_IgnoreMissingLocals).mapValue(*MAV));
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EXPECT_TRUE(VM.count(MAV));
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EXPECT_FALSE(VM.count(&A));
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}
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TEST(ValueMapperTest, mapValueLocalAsMetadataToConstant) {
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LLVMContext Context;
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auto *Int8 = Type::getInt8Ty(Context);
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context), Int8, false);
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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// Map a local value to a constant.
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Argument &A = *F->arg_begin();
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Constant &C = *ConstantInt::get(Int8, 42);
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ValueToValueMapTy VM;
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VM[&A] = &C;
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// Look up the metadata-as-value wrapper. Don't crash.
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auto *MDA = MetadataAsValue::get(Context, ValueAsMetadata::get(&A));
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auto *MDC = MetadataAsValue::get(Context, ValueAsMetadata::get(&C));
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EXPECT_TRUE(isa<LocalAsMetadata>(MDA->getMetadata()));
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EXPECT_TRUE(isa<ConstantAsMetadata>(MDC->getMetadata()));
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EXPECT_EQ(&C, ValueMapper(VM).mapValue(A));
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EXPECT_EQ(MDC, ValueMapper(VM).mapValue(*MDA));
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}
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} // end namespace
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