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llvm-project/llvm/unittests/Linker/LinkModulesTest.cpp

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//===- llvm/unittest/Linker/LinkModulesTest.cpp - IRBuilder tests ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Linker/Linker.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm-c/Linker.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
class LinkModuleTest : public testing::Test {
protected:
void SetUp() override {
M.reset(new Module("MyModule", Ctx));
FunctionType *FTy = FunctionType::get(
Type::getInt8PtrTy(Ctx), Type::getInt32Ty(Ctx), false /*=isVarArg*/);
F = Function::Create(FTy, Function::ExternalLinkage, "ba_func", M.get());
F->setCallingConv(CallingConv::C);
EntryBB = BasicBlock::Create(Ctx, "entry", F);
SwitchCase1BB = BasicBlock::Create(Ctx, "switch.case.1", F);
SwitchCase2BB = BasicBlock::Create(Ctx, "switch.case.2", F);
ExitBB = BasicBlock::Create(Ctx, "exit", F);
AT = ArrayType::get(Type::getInt8PtrTy(Ctx), 3);
GV = new GlobalVariable(*M.get(), AT, false /*=isConstant*/,
GlobalValue::InternalLinkage, nullptr,"switch.bas");
// Global Initializer
std::vector<Constant *> Init;
Constant *SwitchCase1BA = BlockAddress::get(SwitchCase1BB);
Init.push_back(SwitchCase1BA);
Constant *SwitchCase2BA = BlockAddress::get(SwitchCase2BB);
Init.push_back(SwitchCase2BA);
ConstantInt *One = ConstantInt::get(Type::getInt32Ty(Ctx), 1);
Constant *OnePtr = ConstantExpr::getCast(Instruction::IntToPtr, One,
Type::getInt8PtrTy(Ctx));
Init.push_back(OnePtr);
GV->setInitializer(ConstantArray::get(AT, Init));
}
void TearDown() override { M.reset(); }
LLVMContext Ctx;
std::unique_ptr<Module> M;
Function *F;
ArrayType *AT;
GlobalVariable *GV;
BasicBlock *EntryBB;
BasicBlock *SwitchCase1BB;
BasicBlock *SwitchCase2BB;
BasicBlock *ExitBB;
};
static void expectNoDiags(const DiagnosticInfo &DI, void *C) {
EXPECT_TRUE(false);
}
TEST_F(LinkModuleTest, BlockAddress) {
IRBuilder<> Builder(EntryBB);
std::vector<Value *> GEPIndices;
GEPIndices.push_back(ConstantInt::get(Type::getInt32Ty(Ctx), 0));
GEPIndices.push_back(&*F->arg_begin());
Value *GEP = Builder.CreateGEP(AT, GV, GEPIndices, "switch.gep");
Value *Load = Builder.CreateLoad(GEP, "switch.load");
Builder.CreateRet(Load);
Builder.SetInsertPoint(SwitchCase1BB);
Builder.CreateBr(ExitBB);
Builder.SetInsertPoint(SwitchCase2BB);
Builder.CreateBr(ExitBB);
Builder.SetInsertPoint(ExitBB);
Builder.CreateRet(ConstantPointerNull::get(Type::getInt8PtrTy(Ctx)));
Module *LinkedModule = new Module("MyModuleLinked", Ctx);
Ctx.setDiagnosticHandler(expectNoDiags);
Linker::linkModules(*LinkedModule, *M);
// Delete the original module.
M.reset();
// Check that the global "@switch.bas" is well-formed.
const GlobalVariable *LinkedGV = LinkedModule->getNamedGlobal("switch.bas");
const Constant *Init = LinkedGV->getInitializer();
// @switch.bas = internal global [3 x i8*]
// [i8* blockaddress(@ba_func, %switch.case.1),
// i8* blockaddress(@ba_func, %switch.case.2),
// i8* inttoptr (i32 1 to i8*)]
ArrayType *AT = ArrayType::get(Type::getInt8PtrTy(Ctx), 3);
EXPECT_EQ(AT, Init->getType());
Value *Elem = Init->getOperand(0);
ASSERT_TRUE(isa<BlockAddress>(Elem));
EXPECT_EQ(cast<BlockAddress>(Elem)->getFunction(),
LinkedModule->getFunction("ba_func"));
EXPECT_EQ(cast<BlockAddress>(Elem)->getBasicBlock()->getParent(),
LinkedModule->getFunction("ba_func"));
Elem = Init->getOperand(1);
ASSERT_TRUE(isa<BlockAddress>(Elem));
EXPECT_EQ(cast<BlockAddress>(Elem)->getFunction(),
LinkedModule->getFunction("ba_func"));
EXPECT_EQ(cast<BlockAddress>(Elem)->getBasicBlock()->getParent(),
LinkedModule->getFunction("ba_func"));
delete LinkedModule;
}
static Module *getExternal(LLVMContext &Ctx, StringRef FuncName) {
// Create a module with an empty externally-linked function
Module *M = new Module("ExternalModule", Ctx);
FunctionType *FTy = FunctionType::get(
Type::getVoidTy(Ctx), Type::getInt8PtrTy(Ctx), false /*=isVarArgs*/);
Function *F =
Function::Create(FTy, Function::ExternalLinkage, FuncName, M);
F->setCallingConv(CallingConv::C);
BasicBlock *BB = BasicBlock::Create(Ctx, "", F);
IRBuilder<> Builder(BB);
Builder.CreateRetVoid();
return M;
}
static Module *getInternal(LLVMContext &Ctx) {
Module *InternalM = new Module("InternalModule", Ctx);
FunctionType *FTy = FunctionType::get(
Type::getVoidTy(Ctx), Type::getInt8PtrTy(Ctx), false /*=isVarArgs*/);
Function *F =
Function::Create(FTy, Function::InternalLinkage, "bar", InternalM);
F->setCallingConv(CallingConv::C);
BasicBlock *BB = BasicBlock::Create(Ctx, "", F);
IRBuilder<> Builder(BB);
Builder.CreateRetVoid();
StructType *STy = StructType::create(Ctx, PointerType::get(FTy, 0));
GlobalVariable *GV =
new GlobalVariable(*InternalM, STy, false /*=isConstant*/,
GlobalValue::InternalLinkage, nullptr, "g");
GV->setInitializer(ConstantStruct::get(STy, F));
return InternalM;
}
TEST_F(LinkModuleTest, EmptyModule) {
std::unique_ptr<Module> InternalM(getInternal(Ctx));
std::unique_ptr<Module> EmptyM(new Module("EmptyModule1", Ctx));
Ctx.setDiagnosticHandler(expectNoDiags);
Linker::linkModules(*EmptyM, *InternalM);
}
TEST_F(LinkModuleTest, EmptyModule2) {
std::unique_ptr<Module> InternalM(getInternal(Ctx));
std::unique_ptr<Module> EmptyM(new Module("EmptyModule1", Ctx));
Ctx.setDiagnosticHandler(expectNoDiags);
Linker::linkModules(*InternalM, *EmptyM);
}
TEST_F(LinkModuleTest, TypeMerge) {
LLVMContext C;
SMDiagnostic Err;
const char *M1Str = "%t = type {i32}\n"
"@t1 = weak global %t zeroinitializer\n";
std::unique_ptr<Module> M1 = parseAssemblyString(M1Str, Err, C);
const char *M2Str = "%t = type {i32}\n"
"@t2 = weak global %t zeroinitializer\n";
std::unique_ptr<Module> M2 = parseAssemblyString(M2Str, Err, C);
Ctx.setDiagnosticHandler(expectNoDiags);
Linker::linkModules(*M1, *M2);
EXPECT_EQ(M1->getNamedGlobal("t1")->getType(),
M1->getNamedGlobal("t2")->getType());
}
TEST_F(LinkModuleTest, CAPISuccess) {
std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
std::unique_ptr<Module> SourceM(getExternal(Ctx, "bar"));
char *errout = nullptr;
LLVMBool result = LLVMLinkModules(wrap(DestM.get()), wrap(SourceM.get()),
LLVMLinkerDestroySource, &errout);
EXPECT_EQ(0, result);
EXPECT_EQ(nullptr, errout);
// "bar" is present in destination module
EXPECT_NE(nullptr, DestM->getFunction("bar"));
}
TEST_F(LinkModuleTest, CAPIFailure) {
// Symbol clash between two modules
std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
std::unique_ptr<Module> SourceM(getExternal(Ctx, "foo"));
char *errout = nullptr;
LLVMBool result = LLVMLinkModules(wrap(DestM.get()), wrap(SourceM.get()),
LLVMLinkerDestroySource, &errout);
EXPECT_EQ(1, result);
EXPECT_STREQ("Linking globals named 'foo': symbol multiply defined!", errout);
LLVMDisposeMessage(errout);
}
TEST_F(LinkModuleTest, MoveDistinctMDs) {
LLVMContext C;
SMDiagnostic Err;
const char *SrcStr = "define void @foo() !attach !0 {\n"
"entry:\n"
" call void @llvm.md(metadata !1)\n"
" ret void, !attach !2\n"
"}\n"
"declare void @llvm.md(metadata)\n"
"!named = !{!3, !4}\n"
"!0 = distinct !{}\n"
"!1 = distinct !{}\n"
"!2 = distinct !{}\n"
"!3 = distinct !{}\n"
"!4 = !{!3}\n";
std::unique_ptr<Module> Src = parseAssemblyString(SrcStr, Err, C);
assert(Src);
ASSERT_TRUE(Src.get());
// Get the addresses of the Metadata before merging.
Function *F = &*Src->begin();
ASSERT_EQ("foo", F->getName());
BasicBlock *BB = &F->getEntryBlock();
auto *CI = cast<CallInst>(&BB->front());
auto *RI = cast<ReturnInst>(BB->getTerminator());
NamedMDNode *NMD = &*Src->named_metadata_begin();
MDNode *M0 = F->getMetadata("attach");
MDNode *M1 =
cast<MDNode>(cast<MetadataAsValue>(CI->getArgOperand(0))->getMetadata());
MDNode *M2 = RI->getMetadata("attach");
MDNode *M3 = NMD->getOperand(0);
MDNode *M4 = NMD->getOperand(1);
// Confirm a few things about the IR.
EXPECT_TRUE(M0->isDistinct());
EXPECT_TRUE(M1->isDistinct());
EXPECT_TRUE(M2->isDistinct());
EXPECT_TRUE(M3->isDistinct());
EXPECT_TRUE(M4->isUniqued());
EXPECT_EQ(M3, M4->getOperand(0));
// Link into destination module.
auto Dst = llvm::make_unique<Module>("Linked", C);
ASSERT_TRUE(Dst.get());
Ctx.setDiagnosticHandler(expectNoDiags);
Linker::linkModules(*Dst, *Src);
// Check that distinct metadata was moved, not cloned. Even !4, the uniqued
// node, should effectively be moved, since its only operand hasn't changed.
F = &*Dst->begin();
BB = &F->getEntryBlock();
CI = cast<CallInst>(&BB->front());
RI = cast<ReturnInst>(BB->getTerminator());
NMD = &*Dst->named_metadata_begin();
EXPECT_EQ(M0, F->getMetadata("attach"));
EXPECT_EQ(M1, cast<MetadataAsValue>(CI->getArgOperand(0))->getMetadata());
EXPECT_EQ(M2, RI->getMetadata("attach"));
EXPECT_EQ(M3, NMD->getOperand(0));
EXPECT_EQ(M4, NMD->getOperand(1));
// Confirm a few things about the IR. This shouldn't have changed.
EXPECT_TRUE(M0->isDistinct());
EXPECT_TRUE(M1->isDistinct());
EXPECT_TRUE(M2->isDistinct());
EXPECT_TRUE(M3->isDistinct());
EXPECT_TRUE(M4->isUniqued());
EXPECT_EQ(M3, M4->getOperand(0));
}
} // end anonymous namespace
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