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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "intrinsics.h"
#include "art_method.h"
#include "class_linker.h"
#include "driver/compiler_driver.h"
#include "invoke_type.h"
#include "mirror/dex_cache-inl.h"
#include "nodes.h"
#include "scoped_thread_state_change-inl.h"
#include "thread-inl.h"
#include "utils.h"
namespace art {
// Function that returns whether an intrinsic is static/direct or virtual.
static inline InvokeType GetIntrinsicInvokeType(Intrinsics i) {
switch (i) {
case Intrinsics::kNone:
return kInterface; // Non-sensical for intrinsic.
#define OPTIMIZING_INTRINSICS(Name, IsStatic, NeedsEnvironmentOrCache, SideEffects, Exceptions, ...) \
case Intrinsics::k ## Name: \
return IsStatic;
#include "intrinsics_list.h"
INTRINSICS_LIST(OPTIMIZING_INTRINSICS)
#undef INTRINSICS_LIST
#undef OPTIMIZING_INTRINSICS
}
return kInterface;
}
// Function that returns whether an intrinsic needs an environment or not.
static inline IntrinsicNeedsEnvironmentOrCache NeedsEnvironmentOrCache(Intrinsics i) {
switch (i) {
case Intrinsics::kNone:
return kNeedsEnvironmentOrCache; // Non-sensical for intrinsic.
#define OPTIMIZING_INTRINSICS(Name, IsStatic, NeedsEnvironmentOrCache, SideEffects, Exceptions, ...) \
case Intrinsics::k ## Name: \
return NeedsEnvironmentOrCache;
#include "intrinsics_list.h"
INTRINSICS_LIST(OPTIMIZING_INTRINSICS)
#undef INTRINSICS_LIST
#undef OPTIMIZING_INTRINSICS
}
return kNeedsEnvironmentOrCache;
}
// Function that returns whether an intrinsic has side effects.
static inline IntrinsicSideEffects GetSideEffects(Intrinsics i) {
switch (i) {
case Intrinsics::kNone:
return kAllSideEffects;
#define OPTIMIZING_INTRINSICS(Name, IsStatic, NeedsEnvironmentOrCache, SideEffects, Exceptions, ...) \
case Intrinsics::k ## Name: \
return SideEffects;
#include "intrinsics_list.h"
INTRINSICS_LIST(OPTIMIZING_INTRINSICS)
#undef INTRINSICS_LIST
#undef OPTIMIZING_INTRINSICS
}
return kAllSideEffects;
}
// Function that returns whether an intrinsic can throw exceptions.
static inline IntrinsicExceptions GetExceptions(Intrinsics i) {
switch (i) {
case Intrinsics::kNone:
return kCanThrow;
#define OPTIMIZING_INTRINSICS(Name, IsStatic, NeedsEnvironmentOrCache, SideEffects, Exceptions, ...) \
case Intrinsics::k ## Name: \
return Exceptions;
#include "intrinsics_list.h"
INTRINSICS_LIST(OPTIMIZING_INTRINSICS)
#undef INTRINSICS_LIST
#undef OPTIMIZING_INTRINSICS
}
return kCanThrow;
}
static bool CheckInvokeType(Intrinsics intrinsic, HInvoke* invoke) {
// Whenever the intrinsic is marked as static, report an error if we find an InvokeVirtual.
//
// Whenever the intrinsic is marked as direct and we find an InvokeVirtual, a devirtualization
// failure occured. We might be in a situation where we have inlined a method that calls an
// intrinsic, but that method is in a different dex file on which we do not have a
// verified_method that would have helped the compiler driver sharpen the call. In that case,
// make sure that the intrinsic is actually for some final method (or in a final class), as
// otherwise the intrinsics setup is broken.
//
// For the last direction, we have intrinsics for virtual functions that will perform a check
// inline. If the precise type is known, however, the instruction will be sharpened to an
// InvokeStaticOrDirect.
InvokeType intrinsic_type = GetIntrinsicInvokeType(intrinsic);
InvokeType invoke_type = invoke->GetInvokeType();
switch (intrinsic_type) {
case kStatic:
return (invoke_type == kStatic);
case kDirect:
if (invoke_type == kDirect) {
return true;
}
if (invoke_type == kVirtual) {
ArtMethod* art_method = invoke->GetResolvedMethod();
ScopedObjectAccess soa(Thread::Current());
return (art_method->IsFinal() || art_method->GetDeclaringClass()->IsFinal());
}
return false;
case kVirtual:
// Call might be devirtualized.
return (invoke_type == kVirtual || invoke_type == kDirect);
default:
return false;
}
}
void IntrinsicsRecognizer::Run() {
ScopedObjectAccess soa(Thread::Current());
for (HReversePostOrderIterator it(*graph_); !it.Done(); it.Advance()) {
HBasicBlock* block = it.Current();
for (HInstructionIterator inst_it(block->GetInstructions()); !inst_it.Done();
inst_it.Advance()) {
HInstruction* inst = inst_it.Current();
if (inst->IsInvoke()) {
HInvoke* invoke = inst->AsInvoke();
ArtMethod* art_method = invoke->GetResolvedMethod();
if (art_method != nullptr && art_method->IsIntrinsic()) {
Intrinsics intrinsic = static_cast<Intrinsics>(art_method->GetIntrinsic());
if (!CheckInvokeType(intrinsic, invoke)) {
LOG(WARNING) << "Found an intrinsic with unexpected invoke type: "
<< intrinsic << " for "
<< PrettyMethod(invoke->GetDexMethodIndex(), invoke->GetDexFile())
<< invoke->DebugName();
} else {
invoke->SetIntrinsic(intrinsic,
NeedsEnvironmentOrCache(intrinsic),
GetSideEffects(intrinsic),
GetExceptions(intrinsic));
MaybeRecordStat(MethodCompilationStat::kIntrinsicRecognized);
}
}
}
}
}
}
std::ostream& operator<<(std::ostream& os, const Intrinsics& intrinsic) {
switch (intrinsic) {
case Intrinsics::kNone:
os << "None";
break;
#define OPTIMIZING_INTRINSICS(Name, IsStatic, NeedsEnvironmentOrCache, SideEffects, Exceptions, ...) \
case Intrinsics::k ## Name: \
os << # Name; \
break;
#include "intrinsics_list.h"
INTRINSICS_LIST(OPTIMIZING_INTRINSICS)
#undef STATIC_INTRINSICS_LIST
#undef VIRTUAL_INTRINSICS_LIST
#undef OPTIMIZING_INTRINSICS
}
return os;
}
} // namespace art
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