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05294a4e68
Count iterations of zero-trip loops and assert the count is zero, rather than asserting inside the loop. Unreachable functions should use llvm_unreachable. Remove tautological 'if' statements, even when they're following a pattern of checks. Found by the Rotten Green Tests project.
363 lines
13 KiB
C++
363 lines
13 KiB
C++
//===- llvm/unittest/Linker/LinkModulesTest.cpp - IRBuilder tests ---------===//
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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-c/Core.h"
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#include "llvm-c/Linker.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Linker/Linker.h"
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#include "llvm/Support/SourceMgr.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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class LinkModuleTest : public testing::Test {
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protected:
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void SetUp() override {
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M.reset(new Module("MyModule", Ctx));
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FunctionType *FTy = FunctionType::get(
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Type::getInt8PtrTy(Ctx), Type::getInt32Ty(Ctx), false /*=isVarArg*/);
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F = Function::Create(FTy, Function::ExternalLinkage, "ba_func", M.get());
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F->setCallingConv(CallingConv::C);
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EntryBB = BasicBlock::Create(Ctx, "entry", F);
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SwitchCase1BB = BasicBlock::Create(Ctx, "switch.case.1", F);
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SwitchCase2BB = BasicBlock::Create(Ctx, "switch.case.2", F);
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ExitBB = BasicBlock::Create(Ctx, "exit", F);
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AT = ArrayType::get(Type::getInt8PtrTy(Ctx), 3);
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GV = new GlobalVariable(*M.get(), AT, false /*=isConstant*/,
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GlobalValue::InternalLinkage, nullptr,"switch.bas");
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// Global Initializer
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std::vector<Constant *> Init;
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Constant *SwitchCase1BA = BlockAddress::get(SwitchCase1BB);
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Init.push_back(SwitchCase1BA);
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Constant *SwitchCase2BA = BlockAddress::get(SwitchCase2BB);
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Init.push_back(SwitchCase2BA);
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ConstantInt *One = ConstantInt::get(Type::getInt32Ty(Ctx), 1);
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Constant *OnePtr = ConstantExpr::getCast(Instruction::IntToPtr, One,
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Type::getInt8PtrTy(Ctx));
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Init.push_back(OnePtr);
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GV->setInitializer(ConstantArray::get(AT, Init));
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}
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void TearDown() override { M.reset(); }
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LLVMContext Ctx;
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std::unique_ptr<Module> M;
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Function *F;
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ArrayType *AT;
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GlobalVariable *GV;
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BasicBlock *EntryBB;
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BasicBlock *SwitchCase1BB;
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BasicBlock *SwitchCase2BB;
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BasicBlock *ExitBB;
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};
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static void expectNoDiags(const DiagnosticInfo &DI, void *C) {
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llvm_unreachable("expectNoDiags called!");
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}
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TEST_F(LinkModuleTest, BlockAddress) {
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IRBuilder<> Builder(EntryBB);
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std::vector<Value *> GEPIndices;
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GEPIndices.push_back(ConstantInt::get(Type::getInt32Ty(Ctx), 0));
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GEPIndices.push_back(&*F->arg_begin());
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Value *GEP = Builder.CreateGEP(AT, GV, GEPIndices, "switch.gep");
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Value *Load = Builder.CreateLoad(AT->getElementType(), GEP, "switch.load");
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Builder.CreateRet(Load);
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Builder.SetInsertPoint(SwitchCase1BB);
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Builder.CreateBr(ExitBB);
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Builder.SetInsertPoint(SwitchCase2BB);
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Builder.CreateBr(ExitBB);
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Builder.SetInsertPoint(ExitBB);
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Builder.CreateRet(ConstantPointerNull::get(Type::getInt8PtrTy(Ctx)));
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Module *LinkedModule = new Module("MyModuleLinked", Ctx);
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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Linker::linkModules(*LinkedModule, std::move(M));
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// Check that the global "@switch.bas" is well-formed.
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const GlobalVariable *LinkedGV = LinkedModule->getNamedGlobal("switch.bas");
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const Constant *Init = LinkedGV->getInitializer();
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// @switch.bas = internal global [3 x i8*]
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// [i8* blockaddress(@ba_func, %switch.case.1),
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// i8* blockaddress(@ba_func, %switch.case.2),
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// i8* inttoptr (i32 1 to i8*)]
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ArrayType *AT = ArrayType::get(Type::getInt8PtrTy(Ctx), 3);
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EXPECT_EQ(AT, Init->getType());
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Value *Elem = Init->getOperand(0);
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ASSERT_TRUE(isa<BlockAddress>(Elem));
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EXPECT_EQ(cast<BlockAddress>(Elem)->getFunction(),
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LinkedModule->getFunction("ba_func"));
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EXPECT_EQ(cast<BlockAddress>(Elem)->getBasicBlock()->getParent(),
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LinkedModule->getFunction("ba_func"));
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Elem = Init->getOperand(1);
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ASSERT_TRUE(isa<BlockAddress>(Elem));
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EXPECT_EQ(cast<BlockAddress>(Elem)->getFunction(),
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LinkedModule->getFunction("ba_func"));
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EXPECT_EQ(cast<BlockAddress>(Elem)->getBasicBlock()->getParent(),
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LinkedModule->getFunction("ba_func"));
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delete LinkedModule;
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}
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static Module *getExternal(LLVMContext &Ctx, StringRef FuncName) {
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// Create a module with an empty externally-linked function
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Module *M = new Module("ExternalModule", Ctx);
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FunctionType *FTy = FunctionType::get(
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Type::getVoidTy(Ctx), Type::getInt8PtrTy(Ctx), false /*=isVarArgs*/);
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Function *F =
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Function::Create(FTy, Function::ExternalLinkage, FuncName, M);
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F->setCallingConv(CallingConv::C);
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BasicBlock *BB = BasicBlock::Create(Ctx, "", F);
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IRBuilder<> Builder(BB);
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Builder.CreateRetVoid();
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return M;
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}
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static Module *getInternal(LLVMContext &Ctx) {
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Module *InternalM = new Module("InternalModule", Ctx);
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FunctionType *FTy = FunctionType::get(
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Type::getVoidTy(Ctx), Type::getInt8PtrTy(Ctx), false /*=isVarArgs*/);
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Function *F =
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Function::Create(FTy, Function::InternalLinkage, "bar", InternalM);
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F->setCallingConv(CallingConv::C);
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BasicBlock *BB = BasicBlock::Create(Ctx, "", F);
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IRBuilder<> Builder(BB);
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Builder.CreateRetVoid();
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StructType *STy = StructType::create(Ctx, PointerType::get(FTy, 0));
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GlobalVariable *GV =
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new GlobalVariable(*InternalM, STy, false /*=isConstant*/,
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GlobalValue::InternalLinkage, nullptr, "g");
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GV->setInitializer(ConstantStruct::get(STy, F));
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return InternalM;
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}
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TEST_F(LinkModuleTest, EmptyModule) {
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std::unique_ptr<Module> InternalM(getInternal(Ctx));
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std::unique_ptr<Module> EmptyM(new Module("EmptyModule1", Ctx));
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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Linker::linkModules(*EmptyM, std::move(InternalM));
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}
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TEST_F(LinkModuleTest, EmptyModule2) {
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std::unique_ptr<Module> InternalM(getInternal(Ctx));
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std::unique_ptr<Module> EmptyM(new Module("EmptyModule1", Ctx));
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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Linker::linkModules(*InternalM, std::move(EmptyM));
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}
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TEST_F(LinkModuleTest, TypeMerge) {
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LLVMContext C;
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SMDiagnostic Err;
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const char *M1Str = "%t = type {i32}\n"
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"@t1 = weak global %t zeroinitializer\n";
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std::unique_ptr<Module> M1 = parseAssemblyString(M1Str, Err, C);
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const char *M2Str = "%t = type {i32}\n"
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"@t2 = weak global %t zeroinitializer\n";
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std::unique_ptr<Module> M2 = parseAssemblyString(M2Str, Err, C);
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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Linker::linkModules(*M1, std::move(M2));
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EXPECT_EQ(M1->getNamedGlobal("t1")->getType(),
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M1->getNamedGlobal("t2")->getType());
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}
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TEST_F(LinkModuleTest, NewCAPISuccess) {
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std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
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std::unique_ptr<Module> SourceM(getExternal(Ctx, "bar"));
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LLVMBool Result =
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LLVMLinkModules2(wrap(DestM.get()), wrap(SourceM.release()));
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EXPECT_EQ(0, Result);
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// "bar" is present in destination module
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EXPECT_NE(nullptr, DestM->getFunction("bar"));
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}
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static void diagnosticHandler(LLVMDiagnosticInfoRef DI, void *C) {
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auto *Err = reinterpret_cast<std::string *>(C);
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char *CErr = LLVMGetDiagInfoDescription(DI);
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*Err = CErr;
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LLVMDisposeMessage(CErr);
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}
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TEST_F(LinkModuleTest, NewCAPIFailure) {
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// Symbol clash between two modules
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LLVMContext Ctx;
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std::string Err;
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LLVMContextSetDiagnosticHandler(wrap(&Ctx), diagnosticHandler, &Err);
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std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
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std::unique_ptr<Module> SourceM(getExternal(Ctx, "foo"));
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LLVMBool Result =
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LLVMLinkModules2(wrap(DestM.get()), wrap(SourceM.release()));
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EXPECT_EQ(1, Result);
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EXPECT_EQ("Linking globals named 'foo': symbol multiply defined!", Err);
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}
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TEST_F(LinkModuleTest, MoveDistinctMDs) {
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LLVMContext C;
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SMDiagnostic Err;
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const char *SrcStr = "define void @foo() !attach !0 {\n"
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"entry:\n"
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" call void @llvm.md(metadata !1)\n"
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" ret void, !attach !2\n"
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"}\n"
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"declare void @llvm.md(metadata)\n"
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"!named = !{!3, !4}\n"
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"!0 = distinct !{}\n"
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"!1 = distinct !{}\n"
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"!2 = distinct !{}\n"
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"!3 = distinct !{}\n"
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"!4 = !{!3}\n";
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std::unique_ptr<Module> Src = parseAssemblyString(SrcStr, Err, C);
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assert(Src);
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ASSERT_TRUE(Src.get());
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// Get the addresses of the Metadata before merging.
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Function *F = &*Src->begin();
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ASSERT_EQ("foo", F->getName());
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BasicBlock *BB = &F->getEntryBlock();
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auto *CI = cast<CallInst>(&BB->front());
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auto *RI = cast<ReturnInst>(BB->getTerminator());
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NamedMDNode *NMD = &*Src->named_metadata_begin();
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MDNode *M0 = F->getMetadata("attach");
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MDNode *M1 =
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cast<MDNode>(cast<MetadataAsValue>(CI->getArgOperand(0))->getMetadata());
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MDNode *M2 = RI->getMetadata("attach");
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MDNode *M3 = NMD->getOperand(0);
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MDNode *M4 = NMD->getOperand(1);
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// Confirm a few things about the IR.
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EXPECT_TRUE(M0->isDistinct());
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EXPECT_TRUE(M1->isDistinct());
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EXPECT_TRUE(M2->isDistinct());
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EXPECT_TRUE(M3->isDistinct());
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EXPECT_TRUE(M4->isUniqued());
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EXPECT_EQ(M3, M4->getOperand(0));
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// Link into destination module.
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auto Dst = std::make_unique<Module>("Linked", C);
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ASSERT_TRUE(Dst.get());
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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Linker::linkModules(*Dst, std::move(Src));
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// Check that distinct metadata was moved, not cloned. Even !4, the uniqued
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// node, should effectively be moved, since its only operand hasn't changed.
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F = &*Dst->begin();
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BB = &F->getEntryBlock();
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CI = cast<CallInst>(&BB->front());
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RI = cast<ReturnInst>(BB->getTerminator());
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NMD = &*Dst->named_metadata_begin();
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EXPECT_EQ(M0, F->getMetadata("attach"));
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EXPECT_EQ(M1, cast<MetadataAsValue>(CI->getArgOperand(0))->getMetadata());
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EXPECT_EQ(M2, RI->getMetadata("attach"));
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EXPECT_EQ(M3, NMD->getOperand(0));
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EXPECT_EQ(M4, NMD->getOperand(1));
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// Confirm a few things about the IR. This shouldn't have changed.
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EXPECT_TRUE(M0->isDistinct());
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EXPECT_TRUE(M1->isDistinct());
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EXPECT_TRUE(M2->isDistinct());
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EXPECT_TRUE(M3->isDistinct());
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EXPECT_TRUE(M4->isUniqued());
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EXPECT_EQ(M3, M4->getOperand(0));
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}
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TEST_F(LinkModuleTest, RemangleIntrinsics) {
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LLVMContext C;
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SMDiagnostic Err;
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// We load two modules inside the same context C. In both modules there is a
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// "struct.rtx_def" type. In the module loaded the second (Bar) this type will
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// be renamed to "struct.rtx_def.0". Check that the intrinsics which have this
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// type in the signature are properly remangled.
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const char *FooStr =
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"%struct.rtx_def = type { i16 }\n"
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"define void @foo(%struct.rtx_def* %a, i8 %b, i32 %c) {\n"
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" call void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def* %a, i8 %b, i32 %c, i32 4, i1 true)\n"
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" ret void\n"
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"}\n"
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"declare void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def*, i8, i32, i32, i1)\n";
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const char *BarStr =
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"%struct.rtx_def = type { i16 }\n"
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"define void @bar(%struct.rtx_def* %a, i8 %b, i32 %c) {\n"
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" call void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def* %a, i8 %b, i32 %c, i32 4, i1 true)\n"
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" ret void\n"
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"}\n"
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"declare void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def*, i8, i32, i32, i1)\n";
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std::unique_ptr<Module> Foo = parseAssemblyString(FooStr, Err, C);
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assert(Foo);
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ASSERT_TRUE(Foo.get());
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// Foo is loaded first, so the type and the intrinsic have theis original
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// names.
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ASSERT_TRUE(Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.i32"));
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ASSERT_FALSE(Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.0.i32"));
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std::unique_ptr<Module> Bar = parseAssemblyString(BarStr, Err, C);
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assert(Bar);
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ASSERT_TRUE(Bar.get());
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// Bar is loaded after Foo, so the type is renamed to struct.rtx_def.0. Check
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// that the intrinsic is also renamed.
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ASSERT_FALSE(Bar->getFunction("llvm.memset.p0s_struct.rtx_defs.i32"));
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ASSERT_TRUE(Bar->getFunction("llvm.memset.p0s_struct.rtx_def.0s.i32"));
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// Link two modules together.
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auto Dst = std::make_unique<Module>("Linked", C);
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ASSERT_TRUE(Dst.get());
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Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
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bool Failed = Linker::linkModules(*Foo, std::move(Bar));
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ASSERT_FALSE(Failed);
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// "struct.rtx_def" from Foo and "struct.rtx_def.0" from Bar are isomorphic
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// types, so they must be uniquified by linker. Check that they use the same
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// intrinsic definition.
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Function *F = Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.i32");
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ASSERT_EQ(F->getNumUses(), (unsigned)2);
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}
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} // end anonymous namespace
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