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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.
*/
#ifndef ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
#define ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
#include "base/arena_containers.h"
#include "mirror/class-inl.h"
#include "nodes.h"
#include "obj_ptr.h"
#include "optimization.h"
namespace art {
/**
* Propagates reference types to instructions.
*/
class ReferenceTypePropagation : public HOptimization {
public:
ReferenceTypePropagation(HGraph* graph,
Handle<mirror::ClassLoader> class_loader,
Handle<mirror::DexCache> hint_dex_cache,
bool is_first_run,
const char* name = kReferenceTypePropagationPassName);
// Visit a single instruction.
// Used when a pass, such as Inliner or LSE, adds a single instruction.
void Visit(HInstruction* instruction);
// Visit instructions and process dependencies between them.
// Used when a pass, such as LSE, adds multiple dependent instructions, including Phis.
void Visit(ArrayRef<HInstruction* const> instructions);
bool Run() override;
// Returns true if klass is admissible to the propagation: non-null and resolved.
// For an array type, we also check if the component type is admissible.
static bool IsAdmissible(ObjPtr<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_) {
while (klass != nullptr && klass->IsArrayClass()) {
DCHECK(klass->IsResolved());
klass = klass->GetComponentType();
}
return klass != nullptr && klass->IsResolved();
}
static constexpr const char* kReferenceTypePropagationPassName = "reference_type_propagation";
// Fix the reference type for an instruction whose inputs have changed.
// For a select instruction, the reference types of the inputs are merged
// and the resulting reference type is set on the select instruction.
static void FixUpInstructionType(HInstruction* instruction, HandleCache* handle_cache);
private:
class RTPVisitor;
static ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a,
const ReferenceTypeInfo& b,
HandleCache* handle_cache)
REQUIRES_SHARED(Locks::mutator_lock_);
void ValidateTypes();
Handle<mirror::ClassLoader> class_loader_;
// Note: hint_dex_cache_ is usually, but not necessarily, the dex cache associated with
// graph_->GetDexFile(). Since we may look up also in other dex files, it's used only
// as a hint, to reduce the number of calls to the costly ClassLinker::FindDexCache().
Handle<mirror::DexCache> hint_dex_cache_;
// Whether this reference type propagation is the first run we are doing.
const bool is_first_run_;
template<typename T>
friend class ReferenceTypePropagationTestBase;
DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
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