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//===- ExecutionEngineTest.cpp - Unit tests for ExecutionEngine -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalVariable.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ExecutionEngine/Interpreter.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
class ExecutionEngineTest : public testing::Test {
protected:
ExecutionEngineTest()
: M(new Module("<main>", getGlobalContext())),
Engine(EngineBuilder(M).create()) {
}
virtual void SetUp() {
ASSERT_TRUE(Engine.get() != NULL);
}
GlobalVariable *NewExtGlobal(const Type *T, const Twine &Name) {
return new GlobalVariable(*M, T, false, // Not constant.
GlobalValue::ExternalLinkage, NULL, Name);
}
Module *const M;
const OwningPtr<ExecutionEngine> Engine;
};
TEST_F(ExecutionEngineTest, ForwardGlobalMapping) {
GlobalVariable *G1 =
NewExtGlobal(Type::getInt32Ty(getGlobalContext()), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
EXPECT_EQ(&Mem1, Engine->getPointerToGlobalIfAvailable(G1));
int32_t Mem2 = 4;
Engine->updateGlobalMapping(G1, &Mem2);
EXPECT_EQ(&Mem2, Engine->getPointerToGlobalIfAvailable(G1));
Engine->updateGlobalMapping(G1, NULL);
EXPECT_EQ(NULL, Engine->getPointerToGlobalIfAvailable(G1));
Engine->updateGlobalMapping(G1, &Mem2);
EXPECT_EQ(&Mem2, Engine->getPointerToGlobalIfAvailable(G1));
GlobalVariable *G2 =
NewExtGlobal(Type::getInt32Ty(getGlobalContext()), "Global1");
EXPECT_EQ(NULL, 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(getGlobalContext()), "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(NULL, Engine->getGlobalValueAtAddress(&Mem1));
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem2));
GlobalVariable *G2 =
NewExtGlobal(Type::getInt32Ty(getGlobalContext()), "Global2");
Engine->updateGlobalMapping(G2, &Mem1);
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem1));
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem2));
Engine->updateGlobalMapping(G1, NULL);
EXPECT_EQ(G2, Engine->getGlobalValueAtAddress(&Mem1))
<< "Removing one mapping doesn't affect a different one.";
EXPECT_EQ(NULL, Engine->getGlobalValueAtAddress(&Mem2));
Engine->updateGlobalMapping(G2, &Mem2);
EXPECT_EQ(NULL, 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(getGlobalContext()), "Global1");
int32_t Mem1 = 3;
Engine->addGlobalMapping(G1, &Mem1);
EXPECT_EQ(G1, Engine->getGlobalValueAtAddress(&Mem1));
Engine->clearGlobalMappingsFromModule(M);
EXPECT_EQ(NULL, Engine->getGlobalValueAtAddress(&Mem1));
GlobalVariable *G2 =
NewExtGlobal(Type::getInt32Ty(getGlobalContext()), "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(getGlobalContext()), "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(NULL, Engine->getGlobalValueAtAddress(&Mem1));
}
}
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