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/*
* Copyright (C) 2017 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.
*/
// TODO: Dex helpers have ART specific APIs, we may want to refactor these for use in dexdump.
#ifndef ART_LIBDEXFILE_DEX_CODE_ITEM_ACCESSORS_H_
#define ART_LIBDEXFILE_DEX_CODE_ITEM_ACCESSORS_H_
#include <android-base/logging.h>
#include "dex_instruction.h"
namespace art {
namespace dex {
struct CodeItem;
struct TryItem;
} // namespace dex
class ArtMethod;
class DexFile;
class DexInstructionIterator;
template <typename Iter>
class IterationRange;
// Abstracts accesses to the instruction fields of code items for CompactDexFile and
// StandardDexFile.
class CodeItemInstructionAccessor {
public:
ALWAYS_INLINE CodeItemInstructionAccessor(const DexFile& dex_file,
const dex::CodeItem* code_item);
ALWAYS_INLINE explicit CodeItemInstructionAccessor(ArtMethod* method);
ALWAYS_INLINE DexInstructionIterator begin() const;
ALWAYS_INLINE DexInstructionIterator end() const;
IterationRange<DexInstructionIterator> InstructionsFrom(uint32_t start_dex_pc) const;
uint32_t InsnsSizeInCodeUnits() const {
return insns_size_in_code_units_;
}
uint32_t InsnsSizeInBytes() const {
static constexpr uint32_t kCodeUnitSizeInBytes = 2u;
return insns_size_in_code_units_ * kCodeUnitSizeInBytes;
}
const uint16_t* Insns() const {
return insns_;
}
// Return the instruction for a dex pc.
const Instruction& InstructionAt(uint32_t dex_pc) const {
DCHECK_LT(dex_pc, InsnsSizeInCodeUnits());
return *Instruction::At(insns_ + dex_pc);
}
// Return true if the accessor has a code item.
bool HasCodeItem() const {
return Insns() != nullptr;
}
protected:
CodeItemInstructionAccessor() = default;
ALWAYS_INLINE void Init(uint32_t insns_size_in_code_units, const uint16_t* insns);
ALWAYS_INLINE void Init(const DexFile& dex_file, const dex::CodeItem* code_item);
template <typename DexFileCodeItemType>
ALWAYS_INLINE void Init(const DexFileCodeItemType& code_item);
private:
// size of the insns array, in 2 byte code units. 0 if there is no code item.
uint32_t insns_size_in_code_units_ = 0;
// Pointer to the instructions, null if there is no code item.
const uint16_t* insns_ = nullptr;
};
// Abstracts accesses to code item fields other than debug info for CompactDexFile and
// StandardDexFile.
class CodeItemDataAccessor : public CodeItemInstructionAccessor {
public:
ALWAYS_INLINE CodeItemDataAccessor(const DexFile& dex_file, const dex::CodeItem* code_item);
uint16_t RegistersSize() const {
return registers_size_;
}
uint16_t InsSize() const {
return ins_size_;
}
uint16_t OutsSize() const {
return outs_size_;
}
uint16_t TriesSize() const {
return tries_size_;
}
IterationRange<const dex::TryItem*> TryItems() const;
const uint8_t* GetCatchHandlerData(size_t offset = 0) const;
const dex::TryItem* FindTryItem(uint32_t try_dex_pc) const;
inline const void* CodeItemDataEnd() const;
protected:
CodeItemDataAccessor() = default;
ALWAYS_INLINE void Init(const DexFile& dex_file, const dex::CodeItem* code_item);
template <typename DexFileCodeItemType>
ALWAYS_INLINE void Init(const DexFileCodeItemType& code_item);
private:
// Fields mirrored from the dex/cdex code item.
uint16_t registers_size_;
uint16_t ins_size_;
uint16_t outs_size_;
uint16_t tries_size_;
};
// Abstract accesses to code item data including debug info offset. More heavy weight than the other
// helpers.
class CodeItemDebugInfoAccessor : public CodeItemDataAccessor {
public:
CodeItemDebugInfoAccessor() = default;
// Initialize with an existing offset.
ALWAYS_INLINE CodeItemDebugInfoAccessor(const DexFile& dex_file,
const dex::CodeItem* code_item,
uint32_t dex_method_index) {
Init(dex_file, code_item, dex_method_index);
}
ALWAYS_INLINE void Init(const DexFile& dex_file,
const dex::CodeItem* code_item,
uint32_t dex_method_index);
ALWAYS_INLINE explicit CodeItemDebugInfoAccessor(ArtMethod* method);
uint32_t DebugInfoOffset() const {
return debug_info_offset_;
}
template<typename NewLocalVisitor>
bool DecodeDebugLocalInfo(bool is_static,
uint32_t method_idx,
const NewLocalVisitor& new_local) const;
// Visit each parameter in the debug information. Returns the line number.
// The argument of the Visitor is dex::StringIndex.
template <typename Visitor>
uint32_t VisitParameterNames(const Visitor& visitor) const;
template <typename Visitor>
bool DecodeDebugPositionInfo(const Visitor& visitor) const;
bool GetLineNumForPc(const uint32_t pc, uint32_t* line_num) const;
protected:
template <typename DexFileCodeItemType>
ALWAYS_INLINE void Init(const DexFileCodeItemType& code_item, uint32_t dex_method_index);
private:
const DexFile* dex_file_ = nullptr;
uint32_t debug_info_offset_ = 0u;
};
} // namespace art
#endif // ART_LIBDEXFILE_DEX_CODE_ITEM_ACCESSORS_H_
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