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* Copyright (C) 2014 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <vector>
#include "base/mutex.h"
#include "dex_file.h"
#include "method_reference.h"
#include "safe_map.h"
namespace art {
namespace verifier {
class MethodVerifier;
} // namespace verifier
class VerifiedMethod {
// Cast elision set type.
// Since we're adding the dex PCs to the set in increasing order, a sorted vector
// is better for performance (not just memory usage), especially for large sets.
typedef std::vector<uint32_t> SafeCastSet;
// Devirtualization map type maps dex offset to concrete method reference.
typedef SafeMap<uint32_t, MethodReference> DevirtualizationMap;
// Devirtualization map type maps dex offset to field / method idx.
typedef SafeMap<uint32_t, DexFileReference> DequickenMap;
static const VerifiedMethod* Create(verifier::MethodVerifier* method_verifier, bool compile)
~VerifiedMethod() = default;
const std::vector<uint8_t>& GetDexGcMap() const {
return dex_gc_map_;
const DevirtualizationMap& GetDevirtMap() const {
return devirt_map_;
const SafeCastSet& GetSafeCastSet() const {
return safe_cast_set_;
// Returns the devirtualization target method, or nullptr if none.
const MethodReference* GetDevirtTarget(uint32_t dex_pc) const;
// Returns the dequicken field / method for a quick invoke / field get. Returns null if there is
// no entry for that dex pc.
const DexFileReference* GetDequickenIndex(uint32_t dex_pc) const;
// Returns true if the cast can statically be verified to be redundant
// by using the check-cast elision peephole optimization in the verifier.
bool IsSafeCast(uint32_t pc) const;
// Returns true if there were any errors during verification.
bool HasVerificationFailures() const {
return has_verification_failures_;
VerifiedMethod() = default;
* Generate the GC map for a method that has just been verified (i.e. we're doing this as part of
* verification). For type-precise determination we have all the data we need, so we just need to
* encode it in some clever fashion.
* Stores the data in dex_gc_map_, returns true on success and false on failure.
bool GenerateGcMap(verifier::MethodVerifier* method_verifier);
// Verify that the GC map associated with method_ is well formed.
static void VerifyGcMap(verifier::MethodVerifier* method_verifier,
const std::vector<uint8_t>& data);
// Compute sizes for GC map data.
static void ComputeGcMapSizes(verifier::MethodVerifier* method_verifier,
size_t* gc_points, size_t* ref_bitmap_bits, size_t* log2_max_gc_pc);
// Generate devirtualizaion map into devirt_map_.
void GenerateDevirtMap(verifier::MethodVerifier* method_verifier)
// Generate dequickening map into dequicken_map_. Returns false if there is an error.
bool GenerateDequickenMap(verifier::MethodVerifier* method_verifier)
// Generate safe case set into safe_cast_set_.
void GenerateSafeCastSet(verifier::MethodVerifier* method_verifier)
std::vector<uint8_t> dex_gc_map_;
DevirtualizationMap devirt_map_;
// Dequicken map is required for compiling quickened byte codes. The quicken maps from
// dex PC to dex method index or dex field index based on the instruction.
DequickenMap dequicken_map_;
SafeCastSet safe_cast_set_;
bool has_verification_failures_;
} // namespace art