100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_DEX_VERIFIED_METHOD_H_
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#define ART_COMPILER_DEX_VERIFIED_METHOD_H_
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#include <vector>
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#include "base/mutex.h"
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#include "method_reference.h"
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#include "safe_map.h"
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namespace art {
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namespace verifier {
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class MethodVerifier;
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} // namespace verifier
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class VerifiedMethod {
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public:
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// Cast elision set type.
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// Since we're adding the dex PCs to the set in increasing order, a sorted vector
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// is better for performance (not just memory usage), especially for large sets.
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typedef std::vector<uint32_t> SafeCastSet;
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// Devirtualization map type maps dex offset to concrete method reference.
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typedef SafeMap<uint32_t, MethodReference> DevirtualizationMap;
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static const VerifiedMethod* Create(verifier::MethodVerifier* method_verifier, bool compile)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
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~VerifiedMethod() = default;
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const std::vector<uint8_t>& GetDexGcMap() const {
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return dex_gc_map_;
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}
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const DevirtualizationMap& GetDevirtMap() const {
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return devirt_map_;
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}
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const SafeCastSet& GetSafeCastSet() const {
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return safe_cast_set_;
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}
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// Returns the devirtualization target method, or nullptr if none.
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const MethodReference* GetDevirtTarget(uint32_t dex_pc) const;
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// Returns true if the cast can statically be verified to be redundant
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// by using the check-cast elision peephole optimization in the verifier.
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bool IsSafeCast(uint32_t pc) const;
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private:
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VerifiedMethod() = default;
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/*
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* Generate the GC map for a method that has just been verified (i.e. we're doing this as part of
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* verification). For type-precise determination we have all the data we need, so we just need to
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* encode it in some clever fashion.
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* Stores the data in dex_gc_map_, returns true on success and false on failure.
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*/
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bool GenerateGcMap(verifier::MethodVerifier* method_verifier);
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// Verify that the GC map associated with method_ is well formed.
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static void VerifyGcMap(verifier::MethodVerifier* method_verifier,
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const std::vector<uint8_t>& data);
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// Compute sizes for GC map data.
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static void ComputeGcMapSizes(verifier::MethodVerifier* method_verifier,
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size_t* gc_points, size_t* ref_bitmap_bits, size_t* log2_max_gc_pc);
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// Generate devirtualizaion map into devirt_map_.
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void GenerateDevirtMap(verifier::MethodVerifier* method_verifier)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
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// Generate safe case set into safe_cast_set_.
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void GenerateSafeCastSet(verifier::MethodVerifier* method_verifier)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
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std::vector<uint8_t> dex_gc_map_;
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DevirtualizationMap devirt_map_;
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SafeCastSet safe_cast_set_;
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};
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} // namespace art
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#endif // ART_COMPILER_DEX_VERIFIED_METHOD_H_
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