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//===- JITTest.cpp - Unit tests for the JIT -------------------------------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Assembly/Parser.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Constant.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/ExecutionEngine/JIT.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/Support/IRBuilder.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TypeBuilder.h"
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#include "llvm/Target/TargetSelect.h"
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#include "llvm/Type.h"
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Function *makeReturnGlobal(std::string Name, GlobalVariable *G, Module *M) {
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std::vector<const Type*> params;
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const FunctionType *FTy = FunctionType::get(G->getType()->getElementType(),
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Function *F = Function::Create(FTy, GlobalValue::ExternalLinkage, Name, M);
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BasicBlock *Entry = BasicBlock::Create(M->getContext(), "entry", F);
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IRBuilder<> builder(Entry);
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Value *Load = builder.CreateLoad(G);
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const Type *GTy = G->getType()->getElementType();
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Value *Add = builder.CreateAdd(Load, ConstantInt::get(GTy, 1LL));
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builder.CreateStore(Add, G);
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builder.CreateRet(Add);
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std::string DumpFunction(const Function *F) {
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raw_string_ostream(Result) << "" << *F;
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class RecordingJITMemoryManager : public JITMemoryManager {
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const OwningPtr<JITMemoryManager> Base;
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RecordingJITMemoryManager()
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: Base(JITMemoryManager::CreateDefaultMemManager()) {
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void setSizeRequired(bool Required) { SizeRequired = Required; }
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virtual void setMemoryWritable() { Base->setMemoryWritable(); }
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virtual void setMemoryExecutable() { Base->setMemoryExecutable(); }
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virtual void setPoisonMemory(bool poison) { Base->setPoisonMemory(poison); }
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virtual void AllocateGOT() { Base->AllocateGOT(); }
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virtual uint8_t *getGOTBase() const { return Base->getGOTBase(); }
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struct StartFunctionBodyCall {
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StartFunctionBodyCall(uint8_t *Result, const Function *F,
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uintptr_t ActualSize, uintptr_t ActualSizeResult)
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: Result(Result), F(F), F_dump(DumpFunction(F)),
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ActualSize(ActualSize), ActualSizeResult(ActualSizeResult) {}
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uintptr_t ActualSizeResult;
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std::vector<StartFunctionBodyCall> startFunctionBodyCalls;
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virtual uint8_t *startFunctionBody(const Function *F,
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uintptr_t &ActualSize) {
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uintptr_t InitialActualSize = ActualSize;
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uint8_t *Result = Base->startFunctionBody(F, ActualSize);
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startFunctionBodyCalls.push_back(
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StartFunctionBodyCall(Result, F, InitialActualSize, ActualSize));
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virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize,
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return Base->allocateStub(F, StubSize, Alignment);
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struct EndFunctionBodyCall {
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EndFunctionBodyCall(const Function *F, uint8_t *FunctionStart,
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uint8_t *FunctionEnd)
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: F(F), F_dump(DumpFunction(F)),
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FunctionStart(FunctionStart), FunctionEnd(FunctionEnd) {}
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uint8_t *FunctionStart;
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uint8_t *FunctionEnd;
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std::vector<EndFunctionBodyCall> endFunctionBodyCalls;
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virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart,
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uint8_t *FunctionEnd) {
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endFunctionBodyCalls.push_back(
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EndFunctionBodyCall(F, FunctionStart, FunctionEnd));
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Base->endFunctionBody(F, FunctionStart, FunctionEnd);
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virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) {
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return Base->allocateSpace(Size, Alignment);
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virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) {
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return Base->allocateGlobal(Size, Alignment);
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struct DeallocateFunctionBodyCall {
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DeallocateFunctionBodyCall(const void *Body) : Body(Body) {}
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std::vector<DeallocateFunctionBodyCall> deallocateFunctionBodyCalls;
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virtual void deallocateFunctionBody(void *Body) {
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deallocateFunctionBodyCalls.push_back(DeallocateFunctionBodyCall(Body));
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Base->deallocateFunctionBody(Body);
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struct DeallocateExceptionTableCall {
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DeallocateExceptionTableCall(const void *ET) : ET(ET) {}
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std::vector<DeallocateExceptionTableCall> deallocateExceptionTableCalls;
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virtual void deallocateExceptionTable(void *ET) {
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deallocateExceptionTableCalls.push_back(DeallocateExceptionTableCall(ET));
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Base->deallocateExceptionTable(ET);
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struct StartExceptionTableCall {
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StartExceptionTableCall(uint8_t *Result, const Function *F,
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uintptr_t ActualSize, uintptr_t ActualSizeResult)
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: Result(Result), F(F), F_dump(DumpFunction(F)),
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ActualSize(ActualSize), ActualSizeResult(ActualSizeResult) {}
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uintptr_t ActualSize;
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uintptr_t ActualSizeResult;
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std::vector<StartExceptionTableCall> startExceptionTableCalls;
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virtual uint8_t* startExceptionTable(const Function* F,
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uintptr_t &ActualSize) {
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uintptr_t InitialActualSize = ActualSize;
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uint8_t *Result = Base->startExceptionTable(F, ActualSize);
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startExceptionTableCalls.push_back(
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StartExceptionTableCall(Result, F, InitialActualSize, ActualSize));
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struct EndExceptionTableCall {
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EndExceptionTableCall(const Function *F, uint8_t *TableStart,
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uint8_t *TableEnd, uint8_t* FrameRegister)
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: F(F), F_dump(DumpFunction(F)),
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TableStart(TableStart), TableEnd(TableEnd),
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FrameRegister(FrameRegister) {}
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uint8_t *FrameRegister;
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std::vector<EndExceptionTableCall> endExceptionTableCalls;
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virtual void endExceptionTable(const Function *F, uint8_t *TableStart,
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uint8_t *TableEnd, uint8_t* FrameRegister) {
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endExceptionTableCalls.push_back(
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EndExceptionTableCall(F, TableStart, TableEnd, FrameRegister));
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return Base->endExceptionTable(F, TableStart, TableEnd, FrameRegister);
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bool LoadAssemblyInto(Module *M, const char *assembly) {
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NULL != ParseAssemblyString(assembly, M, Error, M->getContext());
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raw_string_ostream os(errMsg);
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EXPECT_TRUE(success) << os.str();
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class JITTest : public testing::Test {
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virtual void SetUp() {
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M = new Module("<main>", Context);
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RJMM = new RecordingJITMemoryManager;
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RJMM->setPoisonMemory(true);
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TheJIT.reset(EngineBuilder(M).setEngineKind(EngineKind::JIT)
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.setJITMemoryManager(RJMM)
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.setErrorStr(&Error).create());
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ASSERT_TRUE(TheJIT.get() != NULL) << Error;
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void LoadAssembly(const char *assembly) {
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LoadAssemblyInto(M, assembly);
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Module *M; // Owned by ExecutionEngine.
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RecordingJITMemoryManager *RJMM;
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OwningPtr<ExecutionEngine> TheJIT;
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// Regression test for a bug. The JIT used to allocate globals inside the same
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// memory block used for the function, and when the function code was freed,
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// the global was left in the same place. This test allocates a function
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// that uses and global, deallocates it, and then makes sure that the global
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// stays alive after that.
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TEST(JIT, GlobalInFunction) {
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Module *M = new Module("<main>", context);
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JITMemoryManager *MemMgr = JITMemoryManager::CreateDefaultMemManager();
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// Tell the memory manager to poison freed memory so that accessing freed
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// memory is more easily tested.
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MemMgr->setPoisonMemory(true);
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OwningPtr<ExecutionEngine> JIT(EngineBuilder(M)
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.setEngineKind(EngineKind::JIT)
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.setJITMemoryManager(MemMgr)
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// The next line enables the fix:
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.setAllocateGVsWithCode(false)
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ASSERT_EQ(Error, "");
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// Create a global variable.
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const Type *GTy = Type::getInt32Ty(context);
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GlobalVariable *G = new GlobalVariable(
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false, // Not constant.
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GlobalValue::InternalLinkage,
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Constant::getNullValue(GTy),
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// Make a function that points to a global.
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Function *F1 = makeReturnGlobal("F1", G, M);
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// Get the pointer to the native code to force it to JIT the function and
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// allocate space for the global.
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reinterpret_cast<void(*)()>((intptr_t)JIT->getPointerToFunction(F1));
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// Since F1 was codegen'd, a pointer to G should be available.
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int32_t *GPtr = (int32_t*)JIT->getPointerToGlobalIfAvailable(G);
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ASSERT_NE((int32_t*)NULL, GPtr);
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// F1() should increment G.
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// Make a second function identical to the first, referring to the same
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Function *F2 = makeReturnGlobal("F2", G, M);
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reinterpret_cast<void(*)()>((intptr_t)JIT->getPointerToFunction(F2));
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// F2() should increment G.
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JIT->freeMachineCodeForFunction(F1);
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// F2() should *still* increment G.
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int PlusOne(int arg) {
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TEST_F(JITTest, FarCallToKnownFunction) {
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// x86-64 can only make direct calls to functions within 32 bits of
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// the current PC. To call anything farther away, we have to load
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// the address into a register and call through the register. The
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// current JIT does this by allocating a stub for any far call.
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// There was a bug in which the JIT tried to emit a direct call when
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// the target was already in the JIT's global mappings and lazy
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// compilation was disabled.
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Function *KnownFunction = Function::Create(
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TypeBuilder<int(int), false>::get(Context),
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GlobalValue::ExternalLinkage, "known", M);
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TheJIT->addGlobalMapping(KnownFunction, (void*)(intptr_t)PlusOne);
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// int test() { return known(7); }
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Function *TestFunction = Function::Create(
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TypeBuilder<int(), false>::get(Context),
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GlobalValue::ExternalLinkage, "test", M);
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BasicBlock *Entry = BasicBlock::Create(Context, "entry", TestFunction);
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IRBuilder<> Builder(Entry);
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Value *result = Builder.CreateCall(
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ConstantInt::get(TypeBuilder<int, false>::get(Context), 7));
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Builder.CreateRet(result);
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TheJIT->DisableLazyCompilation(true);
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int (*TestFunctionPtr)() = reinterpret_cast<int(*)()>(
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(intptr_t)TheJIT->getPointerToFunction(TestFunction));
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// This used to crash in trying to call PlusOne().
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EXPECT_EQ(8, TestFunctionPtr());
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// Test a function C which calls A and B which call each other.
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TEST_F(JITTest, NonLazyCompilationStillNeedsStubs) {
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TheJIT->DisableLazyCompilation(true);
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const FunctionType *Func1Ty =
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cast<FunctionType>(TypeBuilder<void(void), false>::get(Context));
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std::vector<const Type*> arg_types;
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arg_types.push_back(Type::getInt1Ty(Context));
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const FunctionType *FuncTy = FunctionType::get(
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Type::getVoidTy(Context), arg_types, false);
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Function *Func1 = Function::Create(Func1Ty, Function::ExternalLinkage,
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Function *Func2 = Function::Create(FuncTy, Function::InternalLinkage,
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Function *Func3 = Function::Create(FuncTy, Function::InternalLinkage,
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BasicBlock *Block1 = BasicBlock::Create(Context, "block1", Func1);
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BasicBlock *Block2 = BasicBlock::Create(Context, "block2", Func2);
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BasicBlock *True2 = BasicBlock::Create(Context, "cond_true", Func2);
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BasicBlock *False2 = BasicBlock::Create(Context, "cond_false", Func2);
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BasicBlock *Block3 = BasicBlock::Create(Context, "block3", Func3);
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BasicBlock *True3 = BasicBlock::Create(Context, "cond_true", Func3);
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BasicBlock *False3 = BasicBlock::Create(Context, "cond_false", Func3);
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// Make Func1 call Func2(0) and Func3(0).
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IRBuilder<> Builder(Block1);
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Builder.CreateCall(Func2, ConstantInt::getTrue(Context));
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Builder.CreateCall(Func3, ConstantInt::getTrue(Context));
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Builder.CreateRetVoid();
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// void Func2(bool b) { if (b) { Func3(false); return; } return; }
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Builder.SetInsertPoint(Block2);
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Builder.CreateCondBr(Func2->arg_begin(), True2, False2);
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Builder.SetInsertPoint(True2);
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Builder.CreateCall(Func3, ConstantInt::getFalse(Context));
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Builder.CreateRetVoid();
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Builder.SetInsertPoint(False2);
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Builder.CreateRetVoid();
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// void Func3(bool b) { if (b) { Func2(false); return; } return; }
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Builder.SetInsertPoint(Block3);
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Builder.CreateCondBr(Func3->arg_begin(), True3, False3);
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Builder.SetInsertPoint(True3);
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Builder.CreateCall(Func2, ConstantInt::getFalse(Context));
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Builder.CreateRetVoid();
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Builder.SetInsertPoint(False3);
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Builder.CreateRetVoid();
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// Compile the function to native code
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reinterpret_cast<void(*)()>((intptr_t)TheJIT->getPointerToFunction(Func1));
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// Regression test for PR5162. This used to trigger an AssertingVH inside the
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// JIT's Function to stub mapping.
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TEST_F(JITTest, NonLazyLeaksNoStubs) {
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TheJIT->DisableLazyCompilation(true);
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// Create two functions with a single basic block each.
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const FunctionType *FuncTy =
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cast<FunctionType>(TypeBuilder<int(), false>::get(Context));
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Function *Func1 = Function::Create(FuncTy, Function::ExternalLinkage,
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Function *Func2 = Function::Create(FuncTy, Function::InternalLinkage,
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BasicBlock *Block1 = BasicBlock::Create(Context, "block1", Func1);
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BasicBlock *Block2 = BasicBlock::Create(Context, "block2", Func2);
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// The first function calls the second and returns the result
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IRBuilder<> Builder(Block1);
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Value *Result = Builder.CreateCall(Func2);
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Builder.CreateRet(Result);
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// The second function just returns a constant
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Builder.SetInsertPoint(Block2);
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Builder.CreateRet(ConstantInt::get(TypeBuilder<int, false>::get(Context),42));
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// Compile the function to native code
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(void)TheJIT->getPointerToFunction(Func1);
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// Free the JIT state for the functions
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TheJIT->freeMachineCodeForFunction(Func1);
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TheJIT->freeMachineCodeForFunction(Func2);
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// Delete the first function (and show that is has no users)
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EXPECT_EQ(Func1->getNumUses(), 0u);
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Func1->eraseFromParent();
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// Delete the second function (and show that it has no users - it had one,
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// func1 but that's gone now)
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EXPECT_EQ(Func2->getNumUses(), 0u);
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Func2->eraseFromParent();
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TEST_F(JITTest, ModuleDeletion) {
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TheJIT->DisableLazyCompilation(false);
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LoadAssembly("define void @main() { "
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" call i32 @computeVal() "
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"define internal i32 @computeVal() { "
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Function *func = M->getFunction("main");
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TheJIT->getPointerToFunction(func);
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TheJIT->removeModule(M);
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SmallPtrSet<const void*, 2> FunctionsDeallocated;
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for (unsigned i = 0, e = RJMM->deallocateFunctionBodyCalls.size();
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FunctionsDeallocated.insert(RJMM->deallocateFunctionBodyCalls[i].Body);
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for (unsigned i = 0, e = RJMM->startFunctionBodyCalls.size(); i != e; ++i) {
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EXPECT_TRUE(FunctionsDeallocated.count(
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RJMM->startFunctionBodyCalls[i].Result))
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<< "Function leaked: \n" << RJMM->startFunctionBodyCalls[i].F_dump;
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EXPECT_EQ(RJMM->startFunctionBodyCalls.size(),
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RJMM->deallocateFunctionBodyCalls.size());
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SmallPtrSet<const void*, 2> ExceptionTablesDeallocated;
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unsigned NumTablesDeallocated = 0;
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for (unsigned i = 0, e = RJMM->deallocateExceptionTableCalls.size();
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ExceptionTablesDeallocated.insert(
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RJMM->deallocateExceptionTableCalls[i].ET);
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if (RJMM->deallocateExceptionTableCalls[i].ET != NULL) {
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// If JITEmitDebugInfo is off, we'll "deallocate" NULL, which doesn't
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// appear in startExceptionTableCalls.
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NumTablesDeallocated++;
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for (unsigned i = 0, e = RJMM->startExceptionTableCalls.size(); i != e; ++i) {
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EXPECT_TRUE(ExceptionTablesDeallocated.count(
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RJMM->startExceptionTableCalls[i].Result))
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<< "Function's exception table leaked: \n"
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<< RJMM->startExceptionTableCalls[i].F_dump;
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EXPECT_EQ(RJMM->startExceptionTableCalls.size(),
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NumTablesDeallocated);
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// ARM and PPC still emit stubs for calls since the target may be too far away
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// to call directly. This #if can probably be removed when
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// http://llvm.org/PR5201 is fixed.
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#if !defined(__arm__) && !defined(__powerpc__) && !defined(__ppc__)
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typedef int (*FooPtr) ();
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TEST_F(JITTest, NoStubs) {
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LoadAssembly("define void @bar() {"
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"define i32 @foo() {"
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"define i32 @main() {"
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"%0 = call i32 @foo()"
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Function *foo = M->getFunction("foo");
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uintptr_t tmp = (uintptr_t)(TheJIT->getPointerToFunction(foo));
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FooPtr ptr = (FooPtr)(tmp);
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// We should now allocate no more stubs, we have the code to foo
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// and the existing stub for bar.
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int stubsBefore = RJMM->stubsAllocated;
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Function *func = M->getFunction("main");
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TheJIT->getPointerToFunction(func);
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Function *bar = M->getFunction("bar");
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TheJIT->getPointerToFunction(bar);
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ASSERT_EQ(stubsBefore, RJMM->stubsAllocated);
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#endif // !ARM && !PPC
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TEST_F(JITTest, FunctionPointersOutliveTheirCreator) {
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TheJIT->DisableLazyCompilation(true);
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LoadAssembly("define i8()* @get_foo_addr() { "
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"define i8 @foo() { "
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Function *F_get_foo_addr = M->getFunction("get_foo_addr");
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typedef char(*fooT)();
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fooT (*get_foo_addr)() = reinterpret_cast<fooT(*)()>(
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(intptr_t)TheJIT->getPointerToFunction(F_get_foo_addr));
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fooT foo_addr = get_foo_addr();
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// Now free get_foo_addr. This should not free the machine code for foo or
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// any call stub returned as foo's canonical address.
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TheJIT->freeMachineCodeForFunction(F_get_foo_addr);
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// Check by calling the reported address of foo.
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EXPECT_EQ(42, foo_addr());
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// The reported address should also be the same as the result of a subsequent
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// getPointerToFunction(foo).
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// Fails until PR5126 is fixed:
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Function *F_foo = M->getFunction("foo");
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fooT foo = reinterpret_cast<fooT>(
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(intptr_t)TheJIT->getPointerToFunction(F_foo));
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EXPECT_EQ((intptr_t)foo, (intptr_t)foo_addr);
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// ARM doesn't have an implementation of replaceMachineCodeForFunction(), so
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// recompileAndRelinkFunction doesn't work.
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#if !defined(__arm__)
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TEST_F(JITTest, FunctionIsRecompiledAndRelinked) {
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Function *F = Function::Create(TypeBuilder<int(void), false>::get(Context),
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GlobalValue::ExternalLinkage, "test", M);
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BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
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IRBuilder<> Builder(Entry);
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Value *Val = ConstantInt::get(TypeBuilder<int, false>::get(Context), 1);
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Builder.CreateRet(Val);
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TheJIT->DisableLazyCompilation(true);
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// Compile the function once, and make sure it works.
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int (*OrigFPtr)() = reinterpret_cast<int(*)()>(
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(intptr_t)TheJIT->recompileAndRelinkFunction(F));
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EXPECT_EQ(1, OrigFPtr());
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// Now change the function to return a different value.
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Entry->eraseFromParent();
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BasicBlock *NewEntry = BasicBlock::Create(Context, "new_entry", F);
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Builder.SetInsertPoint(NewEntry);
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Val = ConstantInt::get(TypeBuilder<int, false>::get(Context), 2);
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Builder.CreateRet(Val);
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// Recompile it, which should produce a new function pointer _and_ update the
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int (*NewFPtr)() = reinterpret_cast<int(*)()>(
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(intptr_t)TheJIT->recompileAndRelinkFunction(F));
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EXPECT_EQ(2, NewFPtr())
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<< "The new pointer should call the new version of the function";
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EXPECT_EQ(2, OrigFPtr())
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<< "The old pointer's target should now jump to the new version";
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#endif // !defined(__arm__)
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} // anonymous namespace
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// This variable is intentionally defined differently in the statically-compiled
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// program from the IR input to the JIT to assert that the JIT doesn't use its
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extern "C" int32_t JITTest_AvailableExternallyGlobal;
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int32_t JITTest_AvailableExternallyGlobal = 42;
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// CLAMAV LOCAL: disable because this needs rdynamic flag
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TEST_F(JITTest, AvailableExternallyGlobalIsntEmitted) {
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TheJIT->DisableLazyCompilation(true);
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LoadAssembly("@JITTest_AvailableExternallyGlobal = "
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" available_externally global i32 7 "
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"define i32 @loader() { "
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" %result = load i32* @JITTest_AvailableExternallyGlobal "
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Function *loaderIR = M->getFunction("loader");
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int32_t (*loader)() = reinterpret_cast<int32_t(*)()>(
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(intptr_t)TheJIT->getPointerToFunction(loaderIR));
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EXPECT_EQ(42, loader()) << "func should return 42 from the external global,"
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<< " not 7 from the IR version.";
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} // anonymous namespace
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// This function is intentionally defined differently in the statically-compiled
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// program from the IR input to the JIT to assert that the JIT doesn't use its
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extern "C" int32_t JITTest_AvailableExternallyFunction() {
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TEST_F(JITTest, AvailableExternallyFunctionIsntCompiled) {
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TheJIT->DisableLazyCompilation(true);
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LoadAssembly("define available_externally i32 "
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" @JITTest_AvailableExternallyFunction() { "
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"define i32 @func() { "
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" %result = tail call i32 "
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" @JITTest_AvailableExternallyFunction() "
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Function *funcIR = M->getFunction("func");
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int32_t (*func)() = reinterpret_cast<int32_t(*)()>(
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(intptr_t)TheJIT->getPointerToFunction(funcIR));
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EXPECT_EQ(42, func()) << "func should return 42 from the static version,"
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<< " not 7 from the IR version.";
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TEST_F(JITTest, NeedsExactSizeWithManyGlobals) {
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// PR5291: When the JMM needed the exact size of function bodies before
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// starting to emit them, the JITEmitter would modify a set while iterating
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TheJIT->DisableLazyCompilation(true);
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RJMM->setSizeRequired(true);
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LoadAssembly("@A = global i32 42 "
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"@B = global i32* @A "
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"@C = global i32** @B "
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"@D = global i32*** @C "
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"@E = global i32**** @D "
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"@F = global i32***** @E "
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"@G = global i32****** @F "
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"@H = global i32******* @G "
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"@I = global i32******** @H "
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"define i32********* @test() { "
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" ret i32********* @I "
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Function *testIR = M->getFunction("test");
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int32_t********* (*test)() = reinterpret_cast<int32_t*********(*)()>(
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(intptr_t)TheJIT->getPointerToFunction(testIR));
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EXPECT_EQ(42, *********test());
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TEST_F(JITTest, EscapedLazyStubStillCallable) {
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TheJIT->DisableLazyCompilation(false);
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LoadAssembly("define internal i32 @stubbed() { "
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"define i32()* @get_stub() { "
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" ret i32()* @stubbed "
669
typedef int32_t(*StubTy)();
671
// Call get_stub() to get the address of @stubbed without actually JITting it.
672
Function *get_stubIR = M->getFunction("get_stub");
673
StubTy (*get_stub)() = reinterpret_cast<StubTy(*)()>(
674
(intptr_t)TheJIT->getPointerToFunction(get_stubIR));
675
StubTy stubbed = get_stub();
676
// Now get_stubIR is the only reference to stubbed's stub.
677
get_stubIR->eraseFromParent();
678
// Now there are no references inside the JIT, but we've got a pointer outside
679
// it. The stub should be callable and return the right value.
680
EXPECT_EQ(42, stubbed());
683
// Converts the LLVM assembly to bitcode and returns it in a std::string. An
684
// empty string indicates an error.
685
std::string AssembleToBitcode(LLVMContext &Context, const char *Assembly) {
686
Module TempModule("TempModule", Context);
687
if (!LoadAssemblyInto(&TempModule, Assembly)) {
692
raw_string_ostream OS(Result);
693
WriteBitcodeToFile(&TempModule, OS);
698
// Returns a newly-created ExecutionEngine that reads the bitcode in 'Bitcode'
699
// lazily. The associated Module (owned by the ExecutionEngine) is returned in
700
// M. Both will be NULL on an error. Bitcode must live at least as long as the
702
ExecutionEngine *getJITFromBitcode(
703
LLVMContext &Context, const std::string &Bitcode, Module *&M) {
704
// c_str() is null-terminated like MemoryBuffer::getMemBuffer requires.
705
MemoryBuffer *BitcodeBuffer =
706
MemoryBuffer::getMemBuffer(Bitcode.c_str(),
707
Bitcode.c_str() + Bitcode.size(),
710
M = getLazyBitcodeModule(BitcodeBuffer, Context, &errMsg);
712
ADD_FAILURE() << errMsg;
713
delete BitcodeBuffer;
716
ExecutionEngine *TheJIT = EngineBuilder(M)
717
.setEngineKind(EngineKind::JIT)
718
.setErrorStr(&errMsg)
720
if (TheJIT == NULL) {
721
ADD_FAILURE() << errMsg;
729
TEST(LazyLoadedJITTest, MaterializableAvailableExternallyFunctionIsntCompiled) {
731
const std::string Bitcode =
732
AssembleToBitcode(Context,
733
"define available_externally i32 "
734
" @JITTest_AvailableExternallyFunction() { "
738
"define i32 @func() { "
739
" %result = tail call i32 "
740
" @JITTest_AvailableExternallyFunction() "
743
ASSERT_FALSE(Bitcode.empty()) << "Assembling failed";
745
OwningPtr<ExecutionEngine> TheJIT(getJITFromBitcode(Context, Bitcode, M));
746
ASSERT_TRUE(TheJIT.get()) << "Failed to create JIT.";
747
TheJIT->DisableLazyCompilation(true);
749
Function *funcIR = M->getFunction("func");
750
Function *availableFunctionIR =
751
M->getFunction("JITTest_AvailableExternallyFunction");
753
// Double-check that the available_externally function is still unmaterialized
754
// when getPointerToFunction needs to find out if it's available_externally.
755
EXPECT_TRUE(availableFunctionIR->isMaterializable());
757
int32_t (*func)() = reinterpret_cast<int32_t(*)()>(
758
(intptr_t)TheJIT->getPointerToFunction(funcIR));
759
EXPECT_EQ(42, func()) << "func should return 42 from the static version,"
760
<< " not 7 from the IR version.";
763
TEST(LazyLoadedJITTest, EagerCompiledRecursionThroughGhost) {
765
const std::string Bitcode =
766
AssembleToBitcode(Context,
767
"define i32 @recur1(i32 %a) { "
768
" %zero = icmp eq i32 %a, 0 "
769
" br i1 %zero, label %done, label %notdone "
773
" %am1 = sub i32 %a, 1 "
774
" %result = call i32 @recur2(i32 %am1) "
778
"define i32 @recur2(i32 %b) { "
779
" %result = call i32 @recur1(i32 %b) "
782
ASSERT_FALSE(Bitcode.empty()) << "Assembling failed";
784
OwningPtr<ExecutionEngine> TheJIT(getJITFromBitcode(Context, Bitcode, M));
785
ASSERT_TRUE(TheJIT.get()) << "Failed to create JIT.";
786
TheJIT->DisableLazyCompilation(true);
788
Function *recur1IR = M->getFunction("recur1");
789
Function *recur2IR = M->getFunction("recur2");
790
EXPECT_TRUE(recur1IR->isMaterializable());
791
EXPECT_TRUE(recur2IR->isMaterializable());
793
int32_t (*recur1)(int32_t) = reinterpret_cast<int32_t(*)(int32_t)>(
794
(intptr_t)TheJIT->getPointerToFunction(recur1IR));
795
EXPECT_EQ(3, recur1(4));
798
// This code is copied from JITEventListenerTest, but it only runs once for all
799
// the tests in this directory. Everything seems fine, but that's strange
801
class JITEnvironment : public testing::Environment {
802
virtual void SetUp() {
803
// Required to create a JIT.
804
InitializeNativeTarget();
807
testing::Environment* const jit_env =
808
testing::AddGlobalTestEnvironment(new JITEnvironment);