| //===- JITTest.cpp - Unit tests for the JIT -------------------------------===// |
| // |
| // 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/ADT/SmallPtrSet.h" |
| #include "llvm/Assembly/Parser.h" |
| #include "llvm/BasicBlock.h" |
| #include "llvm/Bitcode/ReaderWriter.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/LLVMContext.h" |
| #include "llvm/Module.h" |
| #include "llvm/Support/IRBuilder.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/SourceMgr.h" |
| #include "llvm/Support/TypeBuilder.h" |
| #include "llvm/Support/TargetSelect.h" |
| #include "llvm/Type.h" |
| |
| #include <vector> |
| |
| using namespace llvm; |
| |
| namespace { |
| |
| Function *makeReturnGlobal(std::string Name, GlobalVariable *G, Module *M) { |
| std::vector<Type*> params; |
| FunctionType *FTy = FunctionType::get(G->getType()->getElementType(), |
| params, false); |
| Function *F = Function::Create(FTy, GlobalValue::ExternalLinkage, Name, M); |
| BasicBlock *Entry = BasicBlock::Create(M->getContext(), "entry", F); |
| IRBuilder<> builder(Entry); |
| Value *Load = builder.CreateLoad(G); |
| Type *GTy = G->getType()->getElementType(); |
| Value *Add = builder.CreateAdd(Load, ConstantInt::get(GTy, 1LL)); |
| builder.CreateStore(Add, G); |
| builder.CreateRet(Add); |
| return F; |
| } |
| |
| std::string DumpFunction(const Function *F) { |
| std::string Result; |
| raw_string_ostream(Result) << "" << *F; |
| return Result; |
| } |
| |
| class RecordingJITMemoryManager : public JITMemoryManager { |
| const OwningPtr<JITMemoryManager> Base; |
| public: |
| RecordingJITMemoryManager() |
| : Base(JITMemoryManager::CreateDefaultMemManager()) { |
| stubsAllocated = 0; |
| } |
| |
| virtual void setMemoryWritable() { Base->setMemoryWritable(); } |
| virtual void setMemoryExecutable() { Base->setMemoryExecutable(); } |
| virtual void setPoisonMemory(bool poison) { Base->setPoisonMemory(poison); } |
| virtual void AllocateGOT() { Base->AllocateGOT(); } |
| virtual uint8_t *getGOTBase() const { return Base->getGOTBase(); } |
| struct StartFunctionBodyCall { |
| StartFunctionBodyCall(uint8_t *Result, const Function *F, |
| uintptr_t ActualSize, uintptr_t ActualSizeResult) |
| : Result(Result), F(F), F_dump(DumpFunction(F)), |
| ActualSize(ActualSize), ActualSizeResult(ActualSizeResult) {} |
| uint8_t *Result; |
| const Function *F; |
| std::string F_dump; |
| uintptr_t ActualSize; |
| uintptr_t ActualSizeResult; |
| }; |
| std::vector<StartFunctionBodyCall> startFunctionBodyCalls; |
| virtual uint8_t *startFunctionBody(const Function *F, |
| uintptr_t &ActualSize) { |
| uintptr_t InitialActualSize = ActualSize; |
| uint8_t *Result = Base->startFunctionBody(F, ActualSize); |
| startFunctionBodyCalls.push_back( |
| StartFunctionBodyCall(Result, F, InitialActualSize, ActualSize)); |
| return Result; |
| } |
| int stubsAllocated; |
| virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize, |
| unsigned Alignment) { |
| stubsAllocated++; |
| return Base->allocateStub(F, StubSize, Alignment); |
| } |
| struct EndFunctionBodyCall { |
| EndFunctionBodyCall(const Function *F, uint8_t *FunctionStart, |
| uint8_t *FunctionEnd) |
| : F(F), F_dump(DumpFunction(F)), |
| FunctionStart(FunctionStart), FunctionEnd(FunctionEnd) {} |
| const Function *F; |
| std::string F_dump; |
| uint8_t *FunctionStart; |
| uint8_t *FunctionEnd; |
| }; |
| std::vector<EndFunctionBodyCall> endFunctionBodyCalls; |
| virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart, |
| uint8_t *FunctionEnd) { |
| endFunctionBodyCalls.push_back( |
| EndFunctionBodyCall(F, FunctionStart, FunctionEnd)); |
| Base->endFunctionBody(F, FunctionStart, FunctionEnd); |
| } |
| virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) { |
| return Base->allocateSpace(Size, Alignment); |
| } |
| virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) { |
| return Base->allocateGlobal(Size, Alignment); |
| } |
| struct DeallocateFunctionBodyCall { |
| DeallocateFunctionBodyCall(const void *Body) : Body(Body) {} |
| const void *Body; |
| }; |
| std::vector<DeallocateFunctionBodyCall> deallocateFunctionBodyCalls; |
| virtual void deallocateFunctionBody(void *Body) { |
| deallocateFunctionBodyCalls.push_back(DeallocateFunctionBodyCall(Body)); |
| Base->deallocateFunctionBody(Body); |
| } |
| struct DeallocateExceptionTableCall { |
| DeallocateExceptionTableCall(const void *ET) : ET(ET) {} |
| const void *ET; |
| }; |
| std::vector<DeallocateExceptionTableCall> deallocateExceptionTableCalls; |
| virtual void deallocateExceptionTable(void *ET) { |
| deallocateExceptionTableCalls.push_back(DeallocateExceptionTableCall(ET)); |
| Base->deallocateExceptionTable(ET); |
| } |
| struct StartExceptionTableCall { |
| StartExceptionTableCall(uint8_t *Result, const Function *F, |
| uintptr_t ActualSize, uintptr_t ActualSizeResult) |
| : Result(Result), F(F), F_dump(DumpFunction(F)), |
| ActualSize(ActualSize), ActualSizeResult(ActualSizeResult) {} |
| uint8_t *Result; |
| const Function *F; |
| std::string F_dump; |
| uintptr_t ActualSize; |
| uintptr_t ActualSizeResult; |
| }; |
| std::vector<StartExceptionTableCall> startExceptionTableCalls; |
| virtual uint8_t* startExceptionTable(const Function* F, |
| uintptr_t &ActualSize) { |
| uintptr_t InitialActualSize = ActualSize; |
| uint8_t *Result = Base->startExceptionTable(F, ActualSize); |
| startExceptionTableCalls.push_back( |
| StartExceptionTableCall(Result, F, InitialActualSize, ActualSize)); |
| return Result; |
| } |
| struct EndExceptionTableCall { |
| EndExceptionTableCall(const Function *F, uint8_t *TableStart, |
| uint8_t *TableEnd, uint8_t* FrameRegister) |
| : F(F), F_dump(DumpFunction(F)), |
| TableStart(TableStart), TableEnd(TableEnd), |
| FrameRegister(FrameRegister) {} |
| const Function *F; |
| std::string F_dump; |
| uint8_t *TableStart; |
| uint8_t *TableEnd; |
| uint8_t *FrameRegister; |
| }; |
| std::vector<EndExceptionTableCall> endExceptionTableCalls; |
| virtual void endExceptionTable(const Function *F, uint8_t *TableStart, |
| uint8_t *TableEnd, uint8_t* FrameRegister) { |
| endExceptionTableCalls.push_back( |
| EndExceptionTableCall(F, TableStart, TableEnd, FrameRegister)); |
| return Base->endExceptionTable(F, TableStart, TableEnd, FrameRegister); |
| } |
| }; |
| |
| bool LoadAssemblyInto(Module *M, const char *assembly) { |
| SMDiagnostic Error; |
| bool success = |
| NULL != ParseAssemblyString(assembly, M, Error, M->getContext()); |
| std::string errMsg; |
| raw_string_ostream os(errMsg); |
| Error.Print("", os); |
| EXPECT_TRUE(success) << os.str(); |
| return success; |
| } |
| |
| class JITTest : public testing::Test { |
| protected: |
| virtual void SetUp() { |
| M = new Module("<main>", Context); |
| RJMM = new RecordingJITMemoryManager; |
| RJMM->setPoisonMemory(true); |
| std::string Error; |
| TheJIT.reset(EngineBuilder(M).setEngineKind(EngineKind::JIT) |
| .setJITMemoryManager(RJMM) |
| .setErrorStr(&Error).create()); |
| ASSERT_TRUE(TheJIT.get() != NULL) << Error; |
| } |
| |
| void LoadAssembly(const char *assembly) { |
| LoadAssemblyInto(M, assembly); |
| } |
| |
| LLVMContext Context; |
| Module *M; // Owned by ExecutionEngine. |
| RecordingJITMemoryManager *RJMM; |
| OwningPtr<ExecutionEngine> TheJIT; |
| }; |
| |
| // 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); |
| |
| 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(EngineBuilder(M) |
| .setEngineKind(EngineKind::JIT) |
| .setErrorStr(&Error) |
| .setJITMemoryManager(MemMgr) |
| // The next line enables the fix: |
| .setAllocateGVsWithCode(false) |
| .create()); |
| ASSERT_EQ(Error, ""); |
| |
| // Create a global variable. |
| Type *GTy = Type::getInt32Ty(context); |
| GlobalVariable *G = new GlobalVariable( |
| *M, |
| GTy, |
| false, // Not constant. |
| GlobalValue::InternalLinkage, |
| Constant::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)() = |
| reinterpret_cast<void(*)()>((intptr_t)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); |
| void (*F2Ptr)() = |
| reinterpret_cast<void(*)()>((intptr_t)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); |
| } |
| |
| int PlusOne(int arg) { |
| return arg + 1; |
| } |
| |
| // ARM tests disabled pending fix for PR10783. |
| #if !defined(__arm__) |
| TEST_F(JITTest, FarCallToKnownFunction) { |
| // x86-64 can only make direct calls to functions within 32 bits of |
| // the current PC. To call anything farther away, we have to load |
| // the address into a register and call through the register. The |
| // current JIT does this by allocating a stub for any far call. |
| // There was a bug in which the JIT tried to emit a direct call when |
| // the target was already in the JIT's global mappings and lazy |
| // compilation was disabled. |
| |
| Function *KnownFunction = Function::Create( |
| TypeBuilder<int(int), false>::get(Context), |
| GlobalValue::ExternalLinkage, "known", M); |
| TheJIT->addGlobalMapping(KnownFunction, (void*)(intptr_t)PlusOne); |
| |
| // int test() { return known(7); } |
| Function *TestFunction = Function::Create( |
| TypeBuilder<int(), false>::get(Context), |
| GlobalValue::ExternalLinkage, "test", M); |
| BasicBlock *Entry = BasicBlock::Create(Context, "entry", TestFunction); |
| IRBuilder<> Builder(Entry); |
| Value *result = Builder.CreateCall( |
| KnownFunction, |
| ConstantInt::get(TypeBuilder<int, false>::get(Context), 7)); |
| Builder.CreateRet(result); |
| |
| TheJIT->DisableLazyCompilation(true); |
| int (*TestFunctionPtr)() = reinterpret_cast<int(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(TestFunction)); |
| // This used to crash in trying to call PlusOne(). |
| EXPECT_EQ(8, TestFunctionPtr()); |
| } |
| |
| // Test a function C which calls A and B which call each other. |
| TEST_F(JITTest, NonLazyCompilationStillNeedsStubs) { |
| TheJIT->DisableLazyCompilation(true); |
| |
| FunctionType *Func1Ty = |
| cast<FunctionType>(TypeBuilder<void(void), false>::get(Context)); |
| std::vector<Type*> arg_types; |
| arg_types.push_back(Type::getInt1Ty(Context)); |
| FunctionType *FuncTy = FunctionType::get( |
| Type::getVoidTy(Context), arg_types, false); |
| Function *Func1 = Function::Create(Func1Ty, Function::ExternalLinkage, |
| "func1", M); |
| Function *Func2 = Function::Create(FuncTy, Function::InternalLinkage, |
| "func2", M); |
| Function *Func3 = Function::Create(FuncTy, Function::InternalLinkage, |
| "func3", M); |
| BasicBlock *Block1 = BasicBlock::Create(Context, "block1", Func1); |
| BasicBlock *Block2 = BasicBlock::Create(Context, "block2", Func2); |
| BasicBlock *True2 = BasicBlock::Create(Context, "cond_true", Func2); |
| BasicBlock *False2 = BasicBlock::Create(Context, "cond_false", Func2); |
| BasicBlock *Block3 = BasicBlock::Create(Context, "block3", Func3); |
| BasicBlock *True3 = BasicBlock::Create(Context, "cond_true", Func3); |
| BasicBlock *False3 = BasicBlock::Create(Context, "cond_false", Func3); |
| |
| // Make Func1 call Func2(0) and Func3(0). |
| IRBuilder<> Builder(Block1); |
| Builder.CreateCall(Func2, ConstantInt::getTrue(Context)); |
| Builder.CreateCall(Func3, ConstantInt::getTrue(Context)); |
| Builder.CreateRetVoid(); |
| |
| // void Func2(bool b) { if (b) { Func3(false); return; } return; } |
| Builder.SetInsertPoint(Block2); |
| Builder.CreateCondBr(Func2->arg_begin(), True2, False2); |
| Builder.SetInsertPoint(True2); |
| Builder.CreateCall(Func3, ConstantInt::getFalse(Context)); |
| Builder.CreateRetVoid(); |
| Builder.SetInsertPoint(False2); |
| Builder.CreateRetVoid(); |
| |
| // void Func3(bool b) { if (b) { Func2(false); return; } return; } |
| Builder.SetInsertPoint(Block3); |
| Builder.CreateCondBr(Func3->arg_begin(), True3, False3); |
| Builder.SetInsertPoint(True3); |
| Builder.CreateCall(Func2, ConstantInt::getFalse(Context)); |
| Builder.CreateRetVoid(); |
| Builder.SetInsertPoint(False3); |
| Builder.CreateRetVoid(); |
| |
| // Compile the function to native code |
| void (*F1Ptr)() = |
| reinterpret_cast<void(*)()>((intptr_t)TheJIT->getPointerToFunction(Func1)); |
| |
| F1Ptr(); |
| } |
| |
| // Regression test for PR5162. This used to trigger an AssertingVH inside the |
| // JIT's Function to stub mapping. |
| TEST_F(JITTest, NonLazyLeaksNoStubs) { |
| TheJIT->DisableLazyCompilation(true); |
| |
| // Create two functions with a single basic block each. |
| FunctionType *FuncTy = |
| cast<FunctionType>(TypeBuilder<int(), false>::get(Context)); |
| Function *Func1 = Function::Create(FuncTy, Function::ExternalLinkage, |
| "func1", M); |
| Function *Func2 = Function::Create(FuncTy, Function::InternalLinkage, |
| "func2", M); |
| BasicBlock *Block1 = BasicBlock::Create(Context, "block1", Func1); |
| BasicBlock *Block2 = BasicBlock::Create(Context, "block2", Func2); |
| |
| // The first function calls the second and returns the result |
| IRBuilder<> Builder(Block1); |
| Value *Result = Builder.CreateCall(Func2); |
| Builder.CreateRet(Result); |
| |
| // The second function just returns a constant |
| Builder.SetInsertPoint(Block2); |
| Builder.CreateRet(ConstantInt::get(TypeBuilder<int, false>::get(Context),42)); |
| |
| // Compile the function to native code |
| (void)TheJIT->getPointerToFunction(Func1); |
| |
| // Free the JIT state for the functions |
| TheJIT->freeMachineCodeForFunction(Func1); |
| TheJIT->freeMachineCodeForFunction(Func2); |
| |
| // Delete the first function (and show that is has no users) |
| EXPECT_EQ(Func1->getNumUses(), 0u); |
| Func1->eraseFromParent(); |
| |
| // Delete the second function (and show that it has no users - it had one, |
| // func1 but that's gone now) |
| EXPECT_EQ(Func2->getNumUses(), 0u); |
| Func2->eraseFromParent(); |
| } |
| |
| TEST_F(JITTest, ModuleDeletion) { |
| TheJIT->DisableLazyCompilation(false); |
| LoadAssembly("define void @main() { " |
| " call i32 @computeVal() " |
| " ret void " |
| "} " |
| " " |
| "define internal i32 @computeVal() { " |
| " ret i32 0 " |
| "} "); |
| Function *func = M->getFunction("main"); |
| TheJIT->getPointerToFunction(func); |
| TheJIT->removeModule(M); |
| delete M; |
| |
| SmallPtrSet<const void*, 2> FunctionsDeallocated; |
| for (unsigned i = 0, e = RJMM->deallocateFunctionBodyCalls.size(); |
| i != e; ++i) { |
| FunctionsDeallocated.insert(RJMM->deallocateFunctionBodyCalls[i].Body); |
| } |
| for (unsigned i = 0, e = RJMM->startFunctionBodyCalls.size(); i != e; ++i) { |
| EXPECT_TRUE(FunctionsDeallocated.count( |
| RJMM->startFunctionBodyCalls[i].Result)) |
| << "Function leaked: \n" << RJMM->startFunctionBodyCalls[i].F_dump; |
| } |
| EXPECT_EQ(RJMM->startFunctionBodyCalls.size(), |
| RJMM->deallocateFunctionBodyCalls.size()); |
| |
| SmallPtrSet<const void*, 2> ExceptionTablesDeallocated; |
| unsigned NumTablesDeallocated = 0; |
| for (unsigned i = 0, e = RJMM->deallocateExceptionTableCalls.size(); |
| i != e; ++i) { |
| ExceptionTablesDeallocated.insert( |
| RJMM->deallocateExceptionTableCalls[i].ET); |
| if (RJMM->deallocateExceptionTableCalls[i].ET != NULL) { |
| // If JITEmitDebugInfo is off, we'll "deallocate" NULL, which doesn't |
| // appear in startExceptionTableCalls. |
| NumTablesDeallocated++; |
| } |
| } |
| for (unsigned i = 0, e = RJMM->startExceptionTableCalls.size(); i != e; ++i) { |
| EXPECT_TRUE(ExceptionTablesDeallocated.count( |
| RJMM->startExceptionTableCalls[i].Result)) |
| << "Function's exception table leaked: \n" |
| << RJMM->startExceptionTableCalls[i].F_dump; |
| } |
| EXPECT_EQ(RJMM->startExceptionTableCalls.size(), |
| NumTablesDeallocated); |
| } |
| #endif // !defined(__arm__) |
| |
| // ARM and PPC still emit stubs for calls since the target may be too far away |
| // to call directly. This #if can probably be removed when |
| // http://llvm.org/PR5201 is fixed. |
| #if !defined(__arm__) && !defined(__powerpc__) && !defined(__ppc__) |
| typedef int (*FooPtr) (); |
| |
| TEST_F(JITTest, NoStubs) { |
| LoadAssembly("define void @bar() {" |
| "entry: " |
| "ret void" |
| "}" |
| " " |
| "define i32 @foo() {" |
| "entry:" |
| "call void @bar()" |
| "ret i32 undef" |
| "}" |
| " " |
| "define i32 @main() {" |
| "entry:" |
| "%0 = call i32 @foo()" |
| "call void @bar()" |
| "ret i32 undef" |
| "}"); |
| Function *foo = M->getFunction("foo"); |
| uintptr_t tmp = (uintptr_t)(TheJIT->getPointerToFunction(foo)); |
| FooPtr ptr = (FooPtr)(tmp); |
| |
| (ptr)(); |
| |
| // We should now allocate no more stubs, we have the code to foo |
| // and the existing stub for bar. |
| int stubsBefore = RJMM->stubsAllocated; |
| Function *func = M->getFunction("main"); |
| TheJIT->getPointerToFunction(func); |
| |
| Function *bar = M->getFunction("bar"); |
| TheJIT->getPointerToFunction(bar); |
| |
| ASSERT_EQ(stubsBefore, RJMM->stubsAllocated); |
| } |
| #endif // !ARM && !PPC |
| |
| TEST_F(JITTest, FunctionPointersOutliveTheirCreator) { |
| TheJIT->DisableLazyCompilation(true); |
| LoadAssembly("define i8()* @get_foo_addr() { " |
| " ret i8()* @foo " |
| "} " |
| " " |
| "define i8 @foo() { " |
| " ret i8 42 " |
| "} "); |
| Function *F_get_foo_addr = M->getFunction("get_foo_addr"); |
| |
| typedef char(*fooT)(); |
| fooT (*get_foo_addr)() = reinterpret_cast<fooT(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(F_get_foo_addr)); |
| fooT foo_addr = get_foo_addr(); |
| |
| // Now free get_foo_addr. This should not free the machine code for foo or |
| // any call stub returned as foo's canonical address. |
| TheJIT->freeMachineCodeForFunction(F_get_foo_addr); |
| |
| // Check by calling the reported address of foo. |
| EXPECT_EQ(42, foo_addr()); |
| |
| // The reported address should also be the same as the result of a subsequent |
| // getPointerToFunction(foo). |
| #if 0 |
| // Fails until PR5126 is fixed: |
| Function *F_foo = M->getFunction("foo"); |
| fooT foo = reinterpret_cast<fooT>( |
| (intptr_t)TheJIT->getPointerToFunction(F_foo)); |
| EXPECT_EQ((intptr_t)foo, (intptr_t)foo_addr); |
| #endif |
| } |
| |
| // ARM doesn't have an implementation of replaceMachineCodeForFunction(), so |
| // recompileAndRelinkFunction doesn't work. |
| #if !defined(__arm__) |
| TEST_F(JITTest, FunctionIsRecompiledAndRelinked) { |
| Function *F = Function::Create(TypeBuilder<int(void), false>::get(Context), |
| GlobalValue::ExternalLinkage, "test", M); |
| BasicBlock *Entry = BasicBlock::Create(Context, "entry", F); |
| IRBuilder<> Builder(Entry); |
| Value *Val = ConstantInt::get(TypeBuilder<int, false>::get(Context), 1); |
| Builder.CreateRet(Val); |
| |
| TheJIT->DisableLazyCompilation(true); |
| // Compile the function once, and make sure it works. |
| int (*OrigFPtr)() = reinterpret_cast<int(*)()>( |
| (intptr_t)TheJIT->recompileAndRelinkFunction(F)); |
| EXPECT_EQ(1, OrigFPtr()); |
| |
| // Now change the function to return a different value. |
| Entry->eraseFromParent(); |
| BasicBlock *NewEntry = BasicBlock::Create(Context, "new_entry", F); |
| Builder.SetInsertPoint(NewEntry); |
| Val = ConstantInt::get(TypeBuilder<int, false>::get(Context), 2); |
| Builder.CreateRet(Val); |
| // Recompile it, which should produce a new function pointer _and_ update the |
| // old one. |
| int (*NewFPtr)() = reinterpret_cast<int(*)()>( |
| (intptr_t)TheJIT->recompileAndRelinkFunction(F)); |
| |
| EXPECT_EQ(2, NewFPtr()) |
| << "The new pointer should call the new version of the function"; |
| EXPECT_EQ(2, OrigFPtr()) |
| << "The old pointer's target should now jump to the new version"; |
| } |
| #endif // !defined(__arm__) |
| |
| } // anonymous namespace |
| // This variable is intentionally defined differently in the statically-compiled |
| // program from the IR input to the JIT to assert that the JIT doesn't use its |
| // definition. |
| extern "C" int32_t JITTest_AvailableExternallyGlobal; |
| int32_t JITTest_AvailableExternallyGlobal = 42; |
| namespace { |
| |
| TEST_F(JITTest, AvailableExternallyGlobalIsntEmitted) { |
| TheJIT->DisableLazyCompilation(true); |
| LoadAssembly("@JITTest_AvailableExternallyGlobal = " |
| " available_externally global i32 7 " |
| " " |
| "define i32 @loader() { " |
| " %result = load i32* @JITTest_AvailableExternallyGlobal " |
| " ret i32 %result " |
| "} "); |
| Function *loaderIR = M->getFunction("loader"); |
| |
| int32_t (*loader)() = reinterpret_cast<int32_t(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(loaderIR)); |
| EXPECT_EQ(42, loader()) << "func should return 42 from the external global," |
| << " not 7 from the IR version."; |
| } |
| |
| } // anonymous namespace |
| // This function is intentionally defined differently in the statically-compiled |
| // program from the IR input to the JIT to assert that the JIT doesn't use its |
| // definition. |
| extern "C" int32_t JITTest_AvailableExternallyFunction() { |
| return 42; |
| } |
| namespace { |
| |
| // ARM tests disabled pending fix for PR10783. |
| #if !defined(__arm__) |
| TEST_F(JITTest, AvailableExternallyFunctionIsntCompiled) { |
| TheJIT->DisableLazyCompilation(true); |
| LoadAssembly("define available_externally i32 " |
| " @JITTest_AvailableExternallyFunction() { " |
| " ret i32 7 " |
| "} " |
| " " |
| "define i32 @func() { " |
| " %result = tail call i32 " |
| " @JITTest_AvailableExternallyFunction() " |
| " ret i32 %result " |
| "} "); |
| Function *funcIR = M->getFunction("func"); |
| |
| int32_t (*func)() = reinterpret_cast<int32_t(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(funcIR)); |
| EXPECT_EQ(42, func()) << "func should return 42 from the static version," |
| << " not 7 from the IR version."; |
| } |
| |
| TEST_F(JITTest, EscapedLazyStubStillCallable) { |
| TheJIT->DisableLazyCompilation(false); |
| LoadAssembly("define internal i32 @stubbed() { " |
| " ret i32 42 " |
| "} " |
| " " |
| "define i32()* @get_stub() { " |
| " ret i32()* @stubbed " |
| "} "); |
| typedef int32_t(*StubTy)(); |
| |
| // Call get_stub() to get the address of @stubbed without actually JITting it. |
| Function *get_stubIR = M->getFunction("get_stub"); |
| StubTy (*get_stub)() = reinterpret_cast<StubTy(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(get_stubIR)); |
| StubTy stubbed = get_stub(); |
| // Now get_stubIR is the only reference to stubbed's stub. |
| get_stubIR->eraseFromParent(); |
| // Now there are no references inside the JIT, but we've got a pointer outside |
| // it. The stub should be callable and return the right value. |
| EXPECT_EQ(42, stubbed()); |
| } |
| |
| // Converts the LLVM assembly to bitcode and returns it in a std::string. An |
| // empty string indicates an error. |
| std::string AssembleToBitcode(LLVMContext &Context, const char *Assembly) { |
| Module TempModule("TempModule", Context); |
| if (!LoadAssemblyInto(&TempModule, Assembly)) { |
| return ""; |
| } |
| |
| std::string Result; |
| raw_string_ostream OS(Result); |
| WriteBitcodeToFile(&TempModule, OS); |
| OS.flush(); |
| return Result; |
| } |
| |
| // Returns a newly-created ExecutionEngine that reads the bitcode in 'Bitcode' |
| // lazily. The associated Module (owned by the ExecutionEngine) is returned in |
| // M. Both will be NULL on an error. Bitcode must live at least as long as the |
| // ExecutionEngine. |
| ExecutionEngine *getJITFromBitcode( |
| LLVMContext &Context, const std::string &Bitcode, Module *&M) { |
| // c_str() is null-terminated like MemoryBuffer::getMemBuffer requires. |
| MemoryBuffer *BitcodeBuffer = |
| MemoryBuffer::getMemBuffer(Bitcode, "Bitcode for test"); |
| std::string errMsg; |
| M = getLazyBitcodeModule(BitcodeBuffer, Context, &errMsg); |
| if (M == NULL) { |
| ADD_FAILURE() << errMsg; |
| delete BitcodeBuffer; |
| return NULL; |
| } |
| ExecutionEngine *TheJIT = EngineBuilder(M) |
| .setEngineKind(EngineKind::JIT) |
| .setErrorStr(&errMsg) |
| .create(); |
| if (TheJIT == NULL) { |
| ADD_FAILURE() << errMsg; |
| delete M; |
| M = NULL; |
| return NULL; |
| } |
| return TheJIT; |
| } |
| |
| TEST(LazyLoadedJITTest, MaterializableAvailableExternallyFunctionIsntCompiled) { |
| LLVMContext Context; |
| const std::string Bitcode = |
| AssembleToBitcode(Context, |
| "define available_externally i32 " |
| " @JITTest_AvailableExternallyFunction() { " |
| " ret i32 7 " |
| "} " |
| " " |
| "define i32 @func() { " |
| " %result = tail call i32 " |
| " @JITTest_AvailableExternallyFunction() " |
| " ret i32 %result " |
| "} "); |
| ASSERT_FALSE(Bitcode.empty()) << "Assembling failed"; |
| Module *M; |
| OwningPtr<ExecutionEngine> TheJIT(getJITFromBitcode(Context, Bitcode, M)); |
| ASSERT_TRUE(TheJIT.get()) << "Failed to create JIT."; |
| TheJIT->DisableLazyCompilation(true); |
| |
| Function *funcIR = M->getFunction("func"); |
| Function *availableFunctionIR = |
| M->getFunction("JITTest_AvailableExternallyFunction"); |
| |
| // Double-check that the available_externally function is still unmaterialized |
| // when getPointerToFunction needs to find out if it's available_externally. |
| EXPECT_TRUE(availableFunctionIR->isMaterializable()); |
| |
| int32_t (*func)() = reinterpret_cast<int32_t(*)()>( |
| (intptr_t)TheJIT->getPointerToFunction(funcIR)); |
| EXPECT_EQ(42, func()) << "func should return 42 from the static version," |
| << " not 7 from the IR version."; |
| } |
| |
| TEST(LazyLoadedJITTest, EagerCompiledRecursionThroughGhost) { |
| LLVMContext Context; |
| const std::string Bitcode = |
| AssembleToBitcode(Context, |
| "define i32 @recur1(i32 %a) { " |
| " %zero = icmp eq i32 %a, 0 " |
| " br i1 %zero, label %done, label %notdone " |
| "done: " |
| " ret i32 3 " |
| "notdone: " |
| " %am1 = sub i32 %a, 1 " |
| " %result = call i32 @recur2(i32 %am1) " |
| " ret i32 %result " |
| "} " |
| " " |
| "define i32 @recur2(i32 %b) { " |
| " %result = call i32 @recur1(i32 %b) " |
| " ret i32 %result " |
| "} "); |
| ASSERT_FALSE(Bitcode.empty()) << "Assembling failed"; |
| Module *M; |
| OwningPtr<ExecutionEngine> TheJIT(getJITFromBitcode(Context, Bitcode, M)); |
| ASSERT_TRUE(TheJIT.get()) << "Failed to create JIT."; |
| TheJIT->DisableLazyCompilation(true); |
| |
| Function *recur1IR = M->getFunction("recur1"); |
| Function *recur2IR = M->getFunction("recur2"); |
| EXPECT_TRUE(recur1IR->isMaterializable()); |
| EXPECT_TRUE(recur2IR->isMaterializable()); |
| |
| int32_t (*recur1)(int32_t) = reinterpret_cast<int32_t(*)(int32_t)>( |
| (intptr_t)TheJIT->getPointerToFunction(recur1IR)); |
| EXPECT_EQ(3, recur1(4)); |
| } |
| #endif // !defined(__arm__) |
| |
| // This code is copied from JITEventListenerTest, but it only runs once for all |
| // the tests in this directory. Everything seems fine, but that's strange |
| // behavior. |
| class JITEnvironment : public testing::Environment { |
| virtual void SetUp() { |
| // Required to create a JIT. |
| InitializeNativeTarget(); |
| } |
| }; |
| testing::Environment* const jit_env = |
| testing::AddGlobalTestEnvironment(new JITEnvironment); |
| |
| } |
