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//===- ExecutionEngineTest.cpp - Unit tests for ExecutionEngine -----------===//
//
// 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/ADT/STLExtras.h"
#include "llvm/ExecutionEngine/Interpreter.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/ManagedStatic.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
class ExecutionEngineTest : public testing::Test {
private:
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
protected:
ExecutionEngineTest() {
auto Owner = std::make_unique<Module>("<main>", Context);
M = Owner.get();
Engine.reset(EngineBuilder(std::move(Owner)).setErrorStr(&Error).create());
}
void SetUp() override {
ASSERT_TRUE(Engine.get() != nullptr) << "EngineBuilder returned error: '"
<< Error << "'";
}
GlobalVariable *NewExtGlobal(Type *T, const Twine &Name) {
return new GlobalVariable(*M, T, false, // Not constant.
GlobalValue::ExternalLinkage, nullptr, Name);
}
std::string Error;
LLVMContext Context;
Module *M; // Owned by ExecutionEngine.
std::unique_ptr<ExecutionEngine> Engine;
};
TEST_F(ExecutionEngineTest, ForwardGlobalMapping) {
GlobalVariable *G1 = NewExtGlobal(Type::getInt32Ty(Context), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
EXPECT_EQ(&Mem1, Engine->getPointerToGlobalIfAvailable(G1));
EXPECT_EQ(&Mem1, Engine->getPointerToGlobalIfAvailable("Global1"));
int32_t Mem2 = 4;
Engine->updateGlobalMapping(G1, &Mem2);
EXPECT_EQ(&Mem2, Engine->getPointerToGlobalIfAvailable(G1));
Engine->updateGlobalMapping(G1, nullptr);
EXPECT_EQ(nullptr, Engine->getPointerToGlobalIfAvailable(G1));
Engine->updateGlobalMapping(G1, &Mem2);
EXPECT_EQ(&Mem2, Engine->getPointerToGlobalIfAvailable(G1));
GlobalVariable *G2 = NewExtGlobal(Type::getInt32Ty(Context), "Global1");
EXPECT_EQ(nullptr, Engine->getPointerToGlobalIfAvailable(G2))
<< "The NULL return shouldn't depend on having called"
<< " updateGlobalMapping(..., NULL)";
// Check that update...() can be called before add...().
Engine->updateGlobalMapping(G2, &Mem1);
EXPECT_EQ(&Mem1, Engine->getPointerToGlobalIfAvailable(G2));
EXPECT_EQ(&Mem2, Engine->getPointerToGlobalIfAvailable(G1))
<< "A second mapping shouldn't affect the first.";
}
TEST_F(ExecutionEngineTest, ReverseGlobalMapping) {
GlobalVariable *G1 = NewExtGlobal(Type::getInt32Ty(Context), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem1));
int32_t Mem2 = 4;
Engine->updateGlobalMapping(G1, &Mem2);
EXPECT_EQ(nullptr, Engine->getGlobalValueAtAddress(&Mem1));
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem2));
GlobalVariable *G2 = NewExtGlobal(Type::getInt32Ty(Context), "Global2");
Engine->updateGlobalMapping(G2, &Mem1);
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem1));
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem2));
Engine->updateGlobalMapping(G1, nullptr);
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem1))
<< "Removing one mapping doesn't affect a different one.";
EXPECT_EQ(nullptr, Engine->getGlobalValueAtAddress(&Mem2));
Engine->updateGlobalMapping(G2, &Mem2);
EXPECT_EQ(nullptr, Engine->getGlobalValueAtAddress(&Mem1));
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem2))
<< "Once a mapping is removed, we can point another GV at the"
<< " now-free address.";
}
TEST_F(ExecutionEngineTest, ClearModuleMappings) {
GlobalVariable *G1 = NewExtGlobal(Type::getInt32Ty(Context), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem1));
Engine->clearGlobalMappingsFromModule(M);
EXPECT_EQ(nullptr, Engine->getGlobalValueAtAddress(&Mem1));
GlobalVariable *G2 = NewExtGlobal(Type::getInt32Ty(Context), "Global2");
// After clearing the module mappings, we can assign a new GV to the
// same address.
Engine->addGlobalMapping(G2, &Mem1);
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem1));
}
TEST_F(ExecutionEngineTest, DestructionRemovesGlobalMapping) {
GlobalVariable *G1 = NewExtGlobal(Type::getInt32Ty(Context), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
// Make sure the reverse mapping is enabled.
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem1));
// When the GV goes away, the ExecutionEngine should remove any
// mappings that refer to it.
G1->eraseFromParent();
EXPECT_EQ(nullptr, Engine->getGlobalValueAtAddress(&Mem1));
}
TEST_F(ExecutionEngineTest, LookupWithMangledAndDemangledSymbol) {
int x;
int _x;
llvm::sys::DynamicLibrary::AddSymbol("x", &x);
llvm::sys::DynamicLibrary::AddSymbol("_x", &_x);
// RTDyldMemoryManager::getSymbolAddressInProcess expects a mangled symbol,
// but DynamicLibrary is a wrapper for dlsym, which expects the unmangled C
// symbol name. This test verifies that getSymbolAddressInProcess strips the
// leading '_' on Darwin, but not on other platforms.
#ifdef __APPLE__
EXPECT_EQ(reinterpret_cast<uint64_t>(&x),
RTDyldMemoryManager::getSymbolAddressInProcess("_x"));
#else
EXPECT_EQ(reinterpret_cast<uint64_t>(&_x),
RTDyldMemoryManager::getSymbolAddressInProcess("_x"));
#endif
}
}
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