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llvm/unittests/Linker/LinkModulesTest.cpp
Chandler Carruth 6b547686c5 Update the file headers across all of the LLVM projects in the monorepo 
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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
2019-01-19 08:50:56 +00:00

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//===- llvm/unittest/Linker/LinkModulesTest.cpp - IRBuilder tests ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm-c/Core.h"
#include "llvm-c/Linker.h"
#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 "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.setDiagnosticHandlerCallBack(expectNoDiags);
Linker::linkModules(*LinkedModule, std::move(M));
// 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.setDiagnosticHandlerCallBack(expectNoDiags);
Linker::linkModules(*EmptyM, std::move(InternalM));
}
TEST_F(LinkModuleTest, EmptyModule2) {
std::unique_ptr<Module> InternalM(getInternal(Ctx));
std::unique_ptr<Module> EmptyM(new Module("EmptyModule1", Ctx));
Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
Linker::linkModules(*InternalM, std::move(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.setDiagnosticHandlerCallBack(expectNoDiags);
Linker::linkModules(*M1, std::move(M2));
EXPECT_EQ(M1->getNamedGlobal("t1")->getType(),
M1->getNamedGlobal("t2")->getType());
}
TEST_F(LinkModuleTest, NewCAPISuccess) {
std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
std::unique_ptr<Module> SourceM(getExternal(Ctx, "bar"));
LLVMBool Result =
LLVMLinkModules2(wrap(DestM.get()), wrap(SourceM.release()));
EXPECT_EQ(0, Result);
// "bar" is present in destination module
EXPECT_NE(nullptr, DestM->getFunction("bar"));
}
static void diagnosticHandler(LLVMDiagnosticInfoRef DI, void *C) {
auto *Err = reinterpret_cast<std::string *>(C);
char *CErr = LLVMGetDiagInfoDescription(DI);
*Err = CErr;
LLVMDisposeMessage(CErr);
}
TEST_F(LinkModuleTest, NewCAPIFailure) {
// Symbol clash between two modules
LLVMContext Ctx;
std::string Err;
LLVMContextSetDiagnosticHandler(wrap(&Ctx), diagnosticHandler, &Err);
std::unique_ptr<Module> DestM(getExternal(Ctx, "foo"));
std::unique_ptr<Module> SourceM(getExternal(Ctx, "foo"));
LLVMBool Result =
LLVMLinkModules2(wrap(DestM.get()), wrap(SourceM.release()));
EXPECT_EQ(1, Result);
EXPECT_EQ("Linking globals named 'foo': symbol multiply defined!", Err);
}
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.setDiagnosticHandlerCallBack(expectNoDiags);
Linker::linkModules(*Dst, std::move(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));
}
TEST_F(LinkModuleTest, RemangleIntrinsics) {
LLVMContext C;
SMDiagnostic Err;
// We load two modules inside the same context C. In both modules there is a
// "struct.rtx_def" type. In the module loaded the second (Bar) this type will
// be renamed to "struct.rtx_def.0". Check that the intrinsics which have this
// type in the signature are properly remangled.
const char *FooStr =
"%struct.rtx_def = type { i16 }\n"
"define void @foo(%struct.rtx_def* %a, i8 %b, i32 %c) {\n"
" call void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def* %a, i8 %b, i32 %c, i32 4, i1 true)\n"
" ret void\n"
"}\n"
"declare void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def*, i8, i32, i32, i1)\n";
const char *BarStr =
"%struct.rtx_def = type { i16 }\n"
"define void @bar(%struct.rtx_def* %a, i8 %b, i32 %c) {\n"
" call void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def* %a, i8 %b, i32 %c, i32 4, i1 true)\n"
" ret void\n"
"}\n"
"declare void @llvm.memset.p0s_struct.rtx_defs.i32(%struct.rtx_def*, i8, i32, i32, i1)\n";
std::unique_ptr<Module> Foo = parseAssemblyString(FooStr, Err, C);
assert(Foo);
ASSERT_TRUE(Foo.get());
// Foo is loaded first, so the type and the intrinsic have theis original
// names.
ASSERT_TRUE(Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.i32"));
ASSERT_FALSE(Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.0.i32"));
std::unique_ptr<Module> Bar = parseAssemblyString(BarStr, Err, C);
assert(Bar);
ASSERT_TRUE(Bar.get());
// Bar is loaded after Foo, so the type is renamed to struct.rtx_def.0. Check
// that the intrinsic is also renamed.
ASSERT_FALSE(Bar->getFunction("llvm.memset.p0s_struct.rtx_defs.i32"));
ASSERT_TRUE(Bar->getFunction("llvm.memset.p0s_struct.rtx_def.0s.i32"));
// Link two modules together.
auto Dst = llvm::make_unique<Module>("Linked", C);
ASSERT_TRUE(Dst.get());
Ctx.setDiagnosticHandlerCallBack(expectNoDiags);
bool Failed = Linker::linkModules(*Foo, std::move(Bar));
ASSERT_FALSE(Failed);
// "struct.rtx_def" from Foo and "struct.rtx_def.0" from Bar are isomorphic
// types, so they must be uniquified by linker. Check that they use the same
// intrinsic definition.
Function *F = Foo->getFunction("llvm.memset.p0s_struct.rtx_defs.i32");
ASSERT_EQ(F->getNumUses(), (unsigned)2);
}
} // end anonymous namespace
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