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llvm/unittests/IR/ValueHandleTest.cpp
David Blaikie c4423f0478 -Wdeprecated-clean: Fix cases of violating the rule of 5 in ways that are deprecated in C++11 
Various value handles needed to be copy constructible and copy
assignable (mostly for their use in DenseMap). But to avoid an API that
might allow accidental slicing, make these members protected in the base
class and make derived classes final (the special members become
implicitly public there - but disallowing further derived classes that
might be sliced to the intermediate type).

Might be worth having a warning a bit like -Wnon-virtual-dtor that
catches public move/copy assign/ctors in classes with virtual functions.
(suppressable in the same way - by making them protected in the base,
and making the derived classes final) Could be fancier and only diagnose
them when they're actually called, potentially.

Also allow a few default implementations where custom implementations
(especially with non-standard return types) were implemented.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243909 91177308-0d34-0410-b5e6-96231b3b80d8
2015-08-03 22:30:24 +00:00

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//===- ValueHandleTest.cpp - ValueHandle tests ----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/ValueHandle.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "gtest/gtest.h"
#include <memory>
using namespace llvm;
namespace {
class ValueHandle : public testing::Test {
protected:
Constant *ConstantV;
std::unique_ptr<BitCastInst> BitcastV;
ValueHandle() :
ConstantV(ConstantInt::get(Type::getInt32Ty(getGlobalContext()), 0)),
BitcastV(new BitCastInst(ConstantV, Type::getInt32Ty(getGlobalContext()))) {
}
};
class ConcreteCallbackVH final : public CallbackVH {
public:
ConcreteCallbackVH(Value *V) : CallbackVH(V) {}
};
TEST_F(ValueHandle, WeakVH_BasicOperation) {
WeakVH WVH(BitcastV.get());
EXPECT_EQ(BitcastV.get(), WVH);
WVH = ConstantV;
EXPECT_EQ(ConstantV, WVH);
// Make sure I can call a method on the underlying Value. It
// doesn't matter which method.
EXPECT_EQ(Type::getInt32Ty(getGlobalContext()), WVH->getType());
EXPECT_EQ(Type::getInt32Ty(getGlobalContext()), (*WVH).getType());
}
TEST_F(ValueHandle, WeakVH_Comparisons) {
WeakVH BitcastWVH(BitcastV.get());
WeakVH ConstantWVH(ConstantV);
EXPECT_TRUE(BitcastWVH == BitcastWVH);
EXPECT_TRUE(BitcastV.get() == BitcastWVH);
EXPECT_TRUE(BitcastWVH == BitcastV.get());
EXPECT_FALSE(BitcastWVH == ConstantWVH);
EXPECT_TRUE(BitcastWVH != ConstantWVH);
EXPECT_TRUE(BitcastV.get() != ConstantWVH);
EXPECT_TRUE(BitcastWVH != ConstantV);
EXPECT_FALSE(BitcastWVH != BitcastWVH);
// Cast to Value* so comparisons work.
Value *BV = BitcastV.get();
Value *CV = ConstantV;
EXPECT_EQ(BV < CV, BitcastWVH < ConstantWVH);
EXPECT_EQ(BV <= CV, BitcastWVH <= ConstantWVH);
EXPECT_EQ(BV > CV, BitcastWVH > ConstantWVH);
EXPECT_EQ(BV >= CV, BitcastWVH >= ConstantWVH);
EXPECT_EQ(BV < CV, BitcastV.get() < ConstantWVH);
EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantWVH);
EXPECT_EQ(BV > CV, BitcastV.get() > ConstantWVH);
EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantWVH);
EXPECT_EQ(BV < CV, BitcastWVH < ConstantV);
EXPECT_EQ(BV <= CV, BitcastWVH <= ConstantV);
EXPECT_EQ(BV > CV, BitcastWVH > ConstantV);
EXPECT_EQ(BV >= CV, BitcastWVH >= ConstantV);
}
TEST_F(ValueHandle, WeakVH_FollowsRAUW) {
WeakVH WVH(BitcastV.get());
WeakVH WVH_Copy(WVH);
WeakVH WVH_Recreated(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(ConstantV, WVH);
EXPECT_EQ(ConstantV, WVH_Copy);
EXPECT_EQ(ConstantV, WVH_Recreated);
}
TEST_F(ValueHandle, WeakVH_NullOnDeletion) {
WeakVH WVH(BitcastV.get());
WeakVH WVH_Copy(WVH);
WeakVH WVH_Recreated(BitcastV.get());
BitcastV.reset();
Value *null_value = nullptr;
EXPECT_EQ(null_value, WVH);
EXPECT_EQ(null_value, WVH_Copy);
EXPECT_EQ(null_value, WVH_Recreated);
}
TEST_F(ValueHandle, AssertingVH_BasicOperation) {
AssertingVH<CastInst> AVH(BitcastV.get());
CastInst *implicit_to_exact_type = AVH;
(void)implicit_to_exact_type; // Avoid warning.
AssertingVH<Value> GenericAVH(BitcastV.get());
EXPECT_EQ(BitcastV.get(), GenericAVH);
GenericAVH = ConstantV;
EXPECT_EQ(ConstantV, GenericAVH);
// Make sure I can call a method on the underlying CastInst. It
// doesn't matter which method.
EXPECT_FALSE(AVH->mayWriteToMemory());
EXPECT_FALSE((*AVH).mayWriteToMemory());
}
TEST_F(ValueHandle, AssertingVH_Const) {
const CastInst *ConstBitcast = BitcastV.get();
AssertingVH<const CastInst> AVH(ConstBitcast);
const CastInst *implicit_to_exact_type = AVH;
(void)implicit_to_exact_type; // Avoid warning.
}
TEST_F(ValueHandle, AssertingVH_Comparisons) {
AssertingVH<Value> BitcastAVH(BitcastV.get());
AssertingVH<Value> ConstantAVH(ConstantV);
EXPECT_TRUE(BitcastAVH == BitcastAVH);
EXPECT_TRUE(BitcastV.get() == BitcastAVH);
EXPECT_TRUE(BitcastAVH == BitcastV.get());
EXPECT_FALSE(BitcastAVH == ConstantAVH);
EXPECT_TRUE(BitcastAVH != ConstantAVH);
EXPECT_TRUE(BitcastV.get() != ConstantAVH);
EXPECT_TRUE(BitcastAVH != ConstantV);
EXPECT_FALSE(BitcastAVH != BitcastAVH);
// Cast to Value* so comparisons work.
Value *BV = BitcastV.get();
Value *CV = ConstantV;
EXPECT_EQ(BV < CV, BitcastAVH < ConstantAVH);
EXPECT_EQ(BV <= CV, BitcastAVH <= ConstantAVH);
EXPECT_EQ(BV > CV, BitcastAVH > ConstantAVH);
EXPECT_EQ(BV >= CV, BitcastAVH >= ConstantAVH);
EXPECT_EQ(BV < CV, BitcastV.get() < ConstantAVH);
EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantAVH);
EXPECT_EQ(BV > CV, BitcastV.get() > ConstantAVH);
EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantAVH);
EXPECT_EQ(BV < CV, BitcastAVH < ConstantV);
EXPECT_EQ(BV <= CV, BitcastAVH <= ConstantV);
EXPECT_EQ(BV > CV, BitcastAVH > ConstantV);
EXPECT_EQ(BV >= CV, BitcastAVH >= ConstantV);
}
TEST_F(ValueHandle, AssertingVH_DoesNotFollowRAUW) {
AssertingVH<Value> AVH(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(BitcastV.get(), AVH);
}
#ifdef NDEBUG
TEST_F(ValueHandle, AssertingVH_ReducesToPointer) {
EXPECT_EQ(sizeof(CastInst *), sizeof(AssertingVH<CastInst>));
}
#else // !NDEBUG
#ifdef GTEST_HAS_DEATH_TEST
TEST_F(ValueHandle, AssertingVH_Asserts) {
AssertingVH<Value> AVH(BitcastV.get());
EXPECT_DEATH({BitcastV.reset();},
"An asserting value handle still pointed to this value!");
AssertingVH<Value> Copy(AVH);
AVH = nullptr;
EXPECT_DEATH({BitcastV.reset();},
"An asserting value handle still pointed to this value!");
Copy = nullptr;
BitcastV.reset();
}
#endif // GTEST_HAS_DEATH_TEST
#endif // NDEBUG
TEST_F(ValueHandle, CallbackVH_BasicOperation) {
ConcreteCallbackVH CVH(BitcastV.get());
EXPECT_EQ(BitcastV.get(), CVH);
CVH = ConstantV;
EXPECT_EQ(ConstantV, CVH);
// Make sure I can call a method on the underlying Value. It
// doesn't matter which method.
EXPECT_EQ(Type::getInt32Ty(getGlobalContext()), CVH->getType());
EXPECT_EQ(Type::getInt32Ty(getGlobalContext()), (*CVH).getType());
}
TEST_F(ValueHandle, CallbackVH_Comparisons) {
ConcreteCallbackVH BitcastCVH(BitcastV.get());
ConcreteCallbackVH ConstantCVH(ConstantV);
EXPECT_TRUE(BitcastCVH == BitcastCVH);
EXPECT_TRUE(BitcastV.get() == BitcastCVH);
EXPECT_TRUE(BitcastCVH == BitcastV.get());
EXPECT_FALSE(BitcastCVH == ConstantCVH);
EXPECT_TRUE(BitcastCVH != ConstantCVH);
EXPECT_TRUE(BitcastV.get() != ConstantCVH);
EXPECT_TRUE(BitcastCVH != ConstantV);
EXPECT_FALSE(BitcastCVH != BitcastCVH);
// Cast to Value* so comparisons work.
Value *BV = BitcastV.get();
Value *CV = ConstantV;
EXPECT_EQ(BV < CV, BitcastCVH < ConstantCVH);
EXPECT_EQ(BV <= CV, BitcastCVH <= ConstantCVH);
EXPECT_EQ(BV > CV, BitcastCVH > ConstantCVH);
EXPECT_EQ(BV >= CV, BitcastCVH >= ConstantCVH);
EXPECT_EQ(BV < CV, BitcastV.get() < ConstantCVH);
EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantCVH);
EXPECT_EQ(BV > CV, BitcastV.get() > ConstantCVH);
EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantCVH);
EXPECT_EQ(BV < CV, BitcastCVH < ConstantV);
EXPECT_EQ(BV <= CV, BitcastCVH <= ConstantV);
EXPECT_EQ(BV > CV, BitcastCVH > ConstantV);
EXPECT_EQ(BV >= CV, BitcastCVH >= ConstantV);
}
TEST_F(ValueHandle, CallbackVH_CallbackOnDeletion) {
class RecordingVH final : public CallbackVH {
public:
int DeletedCalls;
int AURWCalls;
RecordingVH() : DeletedCalls(0), AURWCalls(0) {}
RecordingVH(Value *V) : CallbackVH(V), DeletedCalls(0), AURWCalls(0) {}
private:
void deleted() override {
DeletedCalls++;
CallbackVH::deleted();
}
void allUsesReplacedWith(Value *) override { AURWCalls++; }
};
RecordingVH RVH;
RVH = BitcastV.get();
EXPECT_EQ(0, RVH.DeletedCalls);
EXPECT_EQ(0, RVH.AURWCalls);
BitcastV.reset();
EXPECT_EQ(1, RVH.DeletedCalls);
EXPECT_EQ(0, RVH.AURWCalls);
}
TEST_F(ValueHandle, CallbackVH_CallbackOnRAUW) {
class RecordingVH final : public CallbackVH {
public:
int DeletedCalls;
Value *AURWArgument;
RecordingVH() : DeletedCalls(0), AURWArgument(nullptr) {}
RecordingVH(Value *V)
: CallbackVH(V), DeletedCalls(0), AURWArgument(nullptr) {}
private:
void deleted() override {
DeletedCalls++;
CallbackVH::deleted();
}
void allUsesReplacedWith(Value *new_value) override {
EXPECT_EQ(nullptr, AURWArgument);
AURWArgument = new_value;
}
};
RecordingVH RVH;
RVH = BitcastV.get();
EXPECT_EQ(0, RVH.DeletedCalls);
EXPECT_EQ(nullptr, RVH.AURWArgument);
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(0, RVH.DeletedCalls);
EXPECT_EQ(ConstantV, RVH.AURWArgument);
}
TEST_F(ValueHandle, CallbackVH_DeletionCanRAUW) {
class RecoveringVH final : public CallbackVH {
public:
int DeletedCalls;
Value *AURWArgument;
LLVMContext *Context;
RecoveringVH() : DeletedCalls(0), AURWArgument(nullptr),
Context(&getGlobalContext()) {}
RecoveringVH(Value *V)
: CallbackVH(V), DeletedCalls(0), AURWArgument(nullptr),
Context(&getGlobalContext()) {}
private:
void deleted() override {
getValPtr()->replaceAllUsesWith(Constant::getNullValue(Type::getInt32Ty(getGlobalContext())));
setValPtr(nullptr);
}
void allUsesReplacedWith(Value *new_value) override {
ASSERT_TRUE(nullptr != getValPtr());
EXPECT_EQ(1U, getValPtr()->getNumUses());
EXPECT_EQ(nullptr, AURWArgument);
AURWArgument = new_value;
}
};
// Normally, if a value has uses, deleting it will crash. However, we can use
// a CallbackVH to remove the uses before the check for no uses.
RecoveringVH RVH;
RVH = BitcastV.get();
std::unique_ptr<BinaryOperator> BitcastUser(
BinaryOperator::CreateAdd(RVH,
Constant::getNullValue(Type::getInt32Ty(getGlobalContext()))));
EXPECT_EQ(BitcastV.get(), BitcastUser->getOperand(0));
BitcastV.reset(); // Would crash without the ValueHandler.
EXPECT_EQ(Constant::getNullValue(Type::getInt32Ty(getGlobalContext())), RVH.AURWArgument);
EXPECT_EQ(Constant::getNullValue(Type::getInt32Ty(getGlobalContext())),
BitcastUser->getOperand(0));
}
TEST_F(ValueHandle, DestroyingOtherVHOnSameValueDoesntBreakIteration) {
// When a CallbackVH modifies other ValueHandles in its callbacks,
// that shouldn't interfere with non-modified ValueHandles receiving
// their appropriate callbacks.
//
// We create the active CallbackVH in the middle of a palindromic
// arrangement of other VHs so that the bad behavior would be
// triggered in whichever order callbacks run.
class DestroyingVH final : public CallbackVH {
public:
std::unique_ptr<WeakVH> ToClear[2];
DestroyingVH(Value *V) {
ToClear[0].reset(new WeakVH(V));
setValPtr(V);
ToClear[1].reset(new WeakVH(V));
}
void deleted() override {
ToClear[0].reset();
ToClear[1].reset();
CallbackVH::deleted();
}
void allUsesReplacedWith(Value *) override {
ToClear[0].reset();
ToClear[1].reset();
}
};
{
WeakVH ShouldBeVisited1(BitcastV.get());
DestroyingVH C(BitcastV.get());
WeakVH ShouldBeVisited2(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(ConstantV, static_cast<Value*>(ShouldBeVisited1));
EXPECT_EQ(ConstantV, static_cast<Value*>(ShouldBeVisited2));
}
{
WeakVH ShouldBeVisited1(BitcastV.get());
DestroyingVH C(BitcastV.get());
WeakVH ShouldBeVisited2(BitcastV.get());
BitcastV.reset();
EXPECT_EQ(nullptr, static_cast<Value*>(ShouldBeVisited1));
EXPECT_EQ(nullptr, static_cast<Value*>(ShouldBeVisited2));
}
}
TEST_F(ValueHandle, AssertingVHCheckedLast) {
// If a CallbackVH exists to clear out a group of AssertingVHs on
// Value deletion, the CallbackVH should get a chance to do so
// before the AssertingVHs assert.
class ClearingVH final : public CallbackVH {
public:
AssertingVH<Value> *ToClear[2];
ClearingVH(Value *V,
AssertingVH<Value> &A0, AssertingVH<Value> &A1)
: CallbackVH(V) {
ToClear[0] = &A0;
ToClear[1] = &A1;
}
void deleted() override {
*ToClear[0] = nullptr;
*ToClear[1] = nullptr;
CallbackVH::deleted();
}
};
AssertingVH<Value> A1, A2;
A1 = BitcastV.get();
ClearingVH C(BitcastV.get(), A1, A2);
A2 = BitcastV.get();
// C.deleted() should run first, clearing the two AssertingVHs,
// which should prevent them from asserting.
BitcastV.reset();
}
}
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