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llvm-mirror/unittests/IR/ValueHandleTest.cpp
Nikita Popov 4e890ca658 [IR] Support efficient AssertingVH/PoisoningVH lookup 
Currently, there doesn't seem to be any way to look up a Value*
in a map/set indexed by AssertingVH/PoisoningVH, without creating
a value handle -- which is fairly expensive, because it involves
adding the value handle to the use list and immediately removing
it again. Using find_as(Value *) does not work (and is in fact
worse than just using find(Value *)), because it will end up
creating multiple value handles during the lookup itself.

For AssertingVH, address this by simply using DenseMapInfo<T *>
instead of manually implementing something. The AssertingVH<T>
will now get coerced to T*, rather than the other way around.

For PoisoningVH, add extra overloads of getHashValue() and
isEqual() that accept a T* argument.

This allows using find_as(Value *) to perform efficient lookups
in assertion-enabled builds.

Differential Revision: https://reviews.llvm.org/D81793
2020-06-14 22:03:03 +02:00

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//===- ValueHandleTest.cpp - ValueHandle tests ----------------------------===//
//
// 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/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:
LLVMContext Context;
Constant *ConstantV;
std::unique_ptr<BitCastInst> BitcastV;
ValueHandle()
: ConstantV(ConstantInt::get(Type::getInt32Ty(Context), 0)),
BitcastV(new BitCastInst(ConstantV, Type::getInt32Ty(Context))) {}
};
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(Context), WVH->getType());
EXPECT_EQ(Type::getInt32Ty(Context), (*WVH).getType());
WVH = BitcastV.get();
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(WVH, BitcastV.get());
BitcastV.reset();
EXPECT_EQ(WVH, nullptr);
}
TEST_F(ValueHandle, WeakTrackingVH_BasicOperation) {
WeakTrackingVH 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(Context), WVH->getType());
EXPECT_EQ(Type::getInt32Ty(Context), (*WVH).getType());
}
TEST_F(ValueHandle, WeakTrackingVH_Comparisons) {
WeakTrackingVH BitcastWVH(BitcastV.get());
WeakTrackingVH 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, WeakTrackingVH_FollowsRAUW) {
WeakTrackingVH WVH(BitcastV.get());
WeakTrackingVH WVH_Copy(WVH);
WeakTrackingVH WVH_Recreated(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(ConstantV, WVH);
EXPECT_EQ(ConstantV, WVH_Copy);
EXPECT_EQ(ConstantV, WVH_Recreated);
}
TEST_F(ValueHandle, WeakTrackingVH_NullOnDeletion) {
WeakTrackingVH WVH(BitcastV.get());
WeakTrackingVH WVH_Copy(WVH);
WeakTrackingVH 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(Context), CVH->getType());
EXPECT_EQ(Type::getInt32Ty(Context), (*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(LLVMContext &TheContext)
: DeletedCalls(0), AURWArgument(nullptr), Context(&TheContext) {}
RecoveringVH(LLVMContext &TheContext, Value *V)
: CallbackVH(V), DeletedCalls(0), AURWArgument(nullptr),
Context(&TheContext) {}
private:
void deleted() override {
getValPtr()->replaceAllUsesWith(
Constant::getNullValue(Type::getInt32Ty(*Context)));
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(Context);
RVH = RecoveringVH(Context, BitcastV.get());
std::unique_ptr<BinaryOperator> BitcastUser(BinaryOperator::CreateAdd(
RVH, Constant::getNullValue(Type::getInt32Ty(Context))));
EXPECT_EQ(BitcastV.get(), BitcastUser->getOperand(0));
BitcastV.reset(); // Would crash without the ValueHandler.
EXPECT_EQ(Constant::getNullValue(Type::getInt32Ty(Context)),
RVH.AURWArgument);
EXPECT_EQ(Constant::getNullValue(Type::getInt32Ty(Context)),
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<WeakTrackingVH> ToClear[2];
DestroyingVH(Value *V) {
ToClear[0].reset(new WeakTrackingVH(V));
setValPtr(V);
ToClear[1].reset(new WeakTrackingVH(V));
}
void deleted() override {
ToClear[0].reset();
ToClear[1].reset();
CallbackVH::deleted();
}
void allUsesReplacedWith(Value *) override {
ToClear[0].reset();
ToClear[1].reset();
}
};
{
WeakTrackingVH ShouldBeVisited1(BitcastV.get());
DestroyingVH C(BitcastV.get());
WeakTrackingVH ShouldBeVisited2(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(ConstantV, static_cast<Value*>(ShouldBeVisited1));
EXPECT_EQ(ConstantV, static_cast<Value*>(ShouldBeVisited2));
}
{
WeakTrackingVH ShouldBeVisited1(BitcastV.get());
DestroyingVH C(BitcastV.get());
WeakTrackingVH 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();
}
TEST_F(ValueHandle, PoisoningVH_BasicOperation) {
PoisoningVH<CastInst> VH(BitcastV.get());
CastInst *implicit_to_exact_type = VH;
(void)implicit_to_exact_type; // Avoid warning.
PoisoningVH<Value> GenericVH(BitcastV.get());
EXPECT_EQ(BitcastV.get(), GenericVH);
GenericVH = ConstantV;
EXPECT_EQ(ConstantV, GenericVH);
// Make sure I can call a method on the underlying CastInst. It
// doesn't matter which method.
EXPECT_FALSE(VH->mayWriteToMemory());
EXPECT_FALSE((*VH).mayWriteToMemory());
}
TEST_F(ValueHandle, PoisoningVH_Const) {
const CastInst *ConstBitcast = BitcastV.get();
PoisoningVH<const CastInst> VH(ConstBitcast);
const CastInst *implicit_to_exact_type = VH;
(void)implicit_to_exact_type; // Avoid warning.
}
TEST_F(ValueHandle, PoisoningVH_Comparisons) {
PoisoningVH<Value> BitcastVH(BitcastV.get());
PoisoningVH<Value> ConstantVH(ConstantV);
EXPECT_TRUE(BitcastVH == BitcastVH);
EXPECT_TRUE(BitcastV.get() == BitcastVH);
EXPECT_TRUE(BitcastVH == BitcastV.get());
EXPECT_FALSE(BitcastVH == ConstantVH);
EXPECT_TRUE(BitcastVH != ConstantVH);
EXPECT_TRUE(BitcastV.get() != ConstantVH);
EXPECT_TRUE(BitcastVH != ConstantV);
EXPECT_FALSE(BitcastVH != BitcastVH);
// Cast to Value* so comparisons work.
Value *BV = BitcastV.get();
Value *CV = ConstantV;
EXPECT_EQ(BV < CV, BitcastVH < ConstantVH);
EXPECT_EQ(BV <= CV, BitcastVH <= ConstantVH);
EXPECT_EQ(BV > CV, BitcastVH > ConstantVH);
EXPECT_EQ(BV >= CV, BitcastVH >= ConstantVH);
EXPECT_EQ(BV < CV, BitcastV.get() < ConstantVH);
EXPECT_EQ(BV <= CV, BitcastV.get() <= ConstantVH);
EXPECT_EQ(BV > CV, BitcastV.get() > ConstantVH);
EXPECT_EQ(BV >= CV, BitcastV.get() >= ConstantVH);
EXPECT_EQ(BV < CV, BitcastVH < ConstantV);
EXPECT_EQ(BV <= CV, BitcastVH <= ConstantV);
EXPECT_EQ(BV > CV, BitcastVH > ConstantV);
EXPECT_EQ(BV >= CV, BitcastVH >= ConstantV);
}
TEST_F(ValueHandle, PoisoningVH_DoesNotFollowRAUW) {
PoisoningVH<Value> VH(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_TRUE(DenseMapInfo<PoisoningVH<Value>>::isEqual(VH, BitcastV.get()));
}
TEST_F(ValueHandle, AssertingVH_DenseMap) {
DenseMap<AssertingVH<Value>, int> Map;
Map.insert({BitcastV.get(), 1});
Map.insert({ConstantV, 2});
// These will create a temporary AssertingVH during lookup.
EXPECT_TRUE(Map.find(BitcastV.get()) != Map.end());
EXPECT_TRUE(Map.find(ConstantV) != Map.end());
// These will not create a temporary AssertingVH.
EXPECT_TRUE(Map.find_as(BitcastV.get()) != Map.end());
EXPECT_TRUE(Map.find_as(ConstantV) != Map.end());
}
TEST_F(ValueHandle, PoisoningVH_DenseMap) {
DenseMap<PoisoningVH<Value>, int> Map;
Map.insert({BitcastV.get(), 1});
Map.insert({ConstantV, 2});
// These will create a temporary PoisoningVH during lookup.
EXPECT_TRUE(Map.find(BitcastV.get()) != Map.end());
EXPECT_TRUE(Map.find(ConstantV) != Map.end());
// These will not create a temporary PoisoningVH.
EXPECT_TRUE(Map.find_as(BitcastV.get()) != Map.end());
EXPECT_TRUE(Map.find_as(ConstantV) != Map.end());
}
#ifdef NDEBUG
TEST_F(ValueHandle, PoisoningVH_ReducesToPointer) {
EXPECT_EQ(sizeof(CastInst *), sizeof(PoisoningVH<CastInst>));
}
#else // !NDEBUG
TEST_F(ValueHandle, TrackingVH_Tracks) {
TrackingVH<Value> VH(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_EQ(VH, ConstantV);
}
#ifdef GTEST_HAS_DEATH_TEST
TEST_F(ValueHandle, PoisoningVH_Asserts) {
PoisoningVH<Value> VH(BitcastV.get());
// The poisoned handle shouldn't assert when the value is deleted.
BitcastV.reset(new BitCastInst(ConstantV, Type::getInt32Ty(Context)));
// But should when we access the handle.
EXPECT_DEATH((void)*VH, "Accessed a poisoned value handle!");
// Now check that poison catches RAUW.
VH = BitcastV.get();
// The replace doesn't trigger anything immediately.
BitcastV->replaceAllUsesWith(ConstantV);
// But a use does.
EXPECT_DEATH((void)*VH, "Accessed a poisoned value handle!");
// Don't clear anything out here as destroying the handles should be fine.
}
TEST_F(ValueHandle, TrackingVH_Asserts) {
{
TrackingVH<Value> VH(BitcastV.get());
// The tracking handle shouldn't assert when the value is deleted.
BitcastV.reset(new BitCastInst(ConstantV, Type::getInt32Ty(Context)));
// But should when we access the handle.
EXPECT_DEATH((void)*VH,
"TrackingVH must be non-null and valid on dereference!");
}
{
TrackingVH<Instruction> VH(BitcastV.get());
BitcastV->replaceAllUsesWith(ConstantV);
EXPECT_DEATH((void)*VH,
"Tracked Value was replaced by one with an invalid type!");
}
}
#endif // GTEST_HAS_DEATH_TEST
#endif // NDEBUG
}
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