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//===- JITEmitter.cpp - Unit tests for the JIT code emitter ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/BasicBlock.h"
#include "llvm/Constant.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ExecutionEngine/JIT.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/Function.h"
#include "llvm/GlobalValue.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Target/TargetSelect.h"
#include "llvm/Type.h"
using namespace llvm;
namespace {
Function *makeReturnGlobal(std::string Name, GlobalVariable *G, Module *M) {
std::vector<const Type*> params;
const FunctionType *FTy = FunctionType::get(G->getType()->getElementType(),
params, false);
Function *F = Function::Create(FTy, GlobalValue::ExternalLinkage, Name, M);
BasicBlock *Entry = BasicBlock::Create("entry", F);
IRBuilder<> builder(Entry);
Value *Load = builder.CreateLoad(G);
const Type *GTy = G->getType()->getElementType();
Value *Add = builder.CreateAdd(Load, ConstantInt::get(GTy, 1LL));
builder.CreateStore(Add, G);
builder.CreateRet(Add);
return F;
}
// Regression test for a bug. The JIT used to allocate globals inside the same
// memory block used for the function, and when the function code was freed,
// the global was left in the same place. This test allocates a function
// that uses and global, deallocates it, and then makes sure that the global
// stays alive after that.
TEST(JIT, GlobalInFunction) {
LLVMContext context;
Module *M = new Module("<main>", context);
ExistingModuleProvider *MP = new ExistingModuleProvider(M);
JITMemoryManager *MemMgr = JITMemoryManager::CreateDefaultMemManager();
// Tell the memory manager to poison freed memory so that accessing freed
// memory is more easily tested.
MemMgr->setPoisonMemory(true);
std::string Error;
OwningPtr<ExecutionEngine> JIT(ExecutionEngine::createJIT(
MP,
&Error,
MemMgr,
CodeGenOpt::Default,
false)); // This last argument enables the fix.
ASSERT_EQ(Error, "");
// Create a global variable.
const Type *GTy = Type::Int32Ty;
GlobalVariable *G = new GlobalVariable(
*M,
GTy,
false, // Not constant.
GlobalValue::InternalLinkage,
context.getNullValue(GTy),
"myglobal");
// Make a function that points to a global.
Function *F1 = makeReturnGlobal("F1", G, M);
// Get the pointer to the native code to force it to JIT the function and
// allocate space for the global.
void (*F1Ptr)();
// Hack to avoid ISO C++ warning about casting function pointers.
*(void**)(void*)&F1Ptr = JIT->getPointerToFunction(F1);
// Since F1 was codegen'd, a pointer to G should be available.
int32_t *GPtr = (int32_t*)JIT->getPointerToGlobalIfAvailable(G);
ASSERT_NE((int32_t*)NULL, GPtr);
EXPECT_EQ(0, *GPtr);
// F1() should increment G.
F1Ptr();
EXPECT_EQ(1, *GPtr);
// Make a second function identical to the first, referring to the same
// global.
Function *F2 = makeReturnGlobal("F2", G, M);
// Hack to avoid ISO C++ warning about casting function pointers.
void (*F2Ptr)();
*(void**)(void*)&F2Ptr = JIT->getPointerToFunction(F2);
// F2() should increment G.
F2Ptr();
EXPECT_EQ(2, *GPtr);
// Deallocate F1.
JIT->freeMachineCodeForFunction(F1);
// F2() should *still* increment G.
F2Ptr();
EXPECT_EQ(3, *GPtr);
}
// TODO(rnk): This seems to only run once for both tests, which is unexpected.
// That works just fine, but we shouldn't duplicate the code.
class JITEnvironment : public testing::Environment {
virtual void SetUp() {
// Required for ExecutionEngine::createJIT to create a JIT.
InitializeNativeTarget();
}
};
testing::Environment* const jit_env =
testing::AddGlobalTestEnvironment(new JITEnvironment);
}
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