runtime/oat.h

/*
 * Copyright (C) 2011 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_RUNTIME_OAT_H_
#define ART_RUNTIME_OAT_H_

#include <vector>

#include "arch/instruction_set.h"
#include "base/macros.h"
#include "dex_file.h"
#include "safe_map.h"

namespace art {

class InstructionSetFeatures;

class PACKED(4) OatHeader {
 public:
  static constexpr uint8_t kOatMagic[] = { 'o', 'a', 't', '\n' };
  static constexpr uint8_t kOatVersion[] = { '0', '7', '4', '\0' };

  static constexpr const char* kImageLocationKey = "image-location";
  static constexpr const char* kDex2OatCmdLineKey = "dex2oat-cmdline";
  static constexpr const char* kDex2OatHostKey = "dex2oat-host";
  static constexpr const char* kPicKey = "pic";
  static constexpr const char* kDebuggableKey = "debuggable";
  static constexpr const char* kClassPathKey = "classpath";

  static constexpr const char kTrueValue[] = "true";
  static constexpr const char kFalseValue[] = "false";

  static OatHeader* Create(InstructionSet instruction_set,
                           const InstructionSetFeatures* instruction_set_features,
                           uint32_t dex_file_count,
                           const SafeMap<std::string, std::string>* variable_data);

  bool IsValid() const;
  std::string GetValidationErrorMessage() const;
  const char* GetMagic() const;
  uint32_t GetChecksum() const;
  void UpdateChecksumWithHeaderData();
  void UpdateChecksum(const void* data, size_t length);
  uint32_t GetDexFileCount() const {
    DCHECK(IsValid());
    return dex_file_count_;
  }
  uint32_t GetExecutableOffset() const;
  void SetExecutableOffset(uint32_t executable_offset);

  const void* GetInterpreterToInterpreterBridge() const;
  uint32_t GetInterpreterToInterpreterBridgeOffset() const;
  void SetInterpreterToInterpreterBridgeOffset(uint32_t offset);
  const void* GetInterpreterToCompiledCodeBridge() const;
  uint32_t GetInterpreterToCompiledCodeBridgeOffset() const;
  void SetInterpreterToCompiledCodeBridgeOffset(uint32_t offset);

  const void* GetJniDlsymLookup() const;
  uint32_t GetJniDlsymLookupOffset() const;
  void SetJniDlsymLookupOffset(uint32_t offset);

  const void* GetQuickGenericJniTrampoline() const;
  uint32_t GetQuickGenericJniTrampolineOffset() const;
  void SetQuickGenericJniTrampolineOffset(uint32_t offset);
  const void* GetQuickResolutionTrampoline() const;
  uint32_t GetQuickResolutionTrampolineOffset() const;
  void SetQuickResolutionTrampolineOffset(uint32_t offset);
  const void* GetQuickImtConflictTrampoline() const;
  uint32_t GetQuickImtConflictTrampolineOffset() const;
  void SetQuickImtConflictTrampolineOffset(uint32_t offset);
  const void* GetQuickToInterpreterBridge() const;
  uint32_t GetQuickToInterpreterBridgeOffset() const;
  void SetQuickToInterpreterBridgeOffset(uint32_t offset);

  int32_t GetImagePatchDelta() const;
  void RelocateOat(off_t delta);
  void SetImagePatchDelta(int32_t off);

  InstructionSet GetInstructionSet() const;
  uint32_t GetInstructionSetFeaturesBitmap() const;

  uint32_t GetImageFileLocationOatChecksum() const;
  void SetImageFileLocationOatChecksum(uint32_t image_file_location_oat_checksum);
  uint32_t GetImageFileLocationOatDataBegin() const;
  void SetImageFileLocationOatDataBegin(uint32_t image_file_location_oat_data_begin);

  uint32_t GetKeyValueStoreSize() const;
  const uint8_t* GetKeyValueStore() const;
  const char* GetStoreValueByKey(const char* key) const;
  bool GetStoreKeyValuePairByIndex(size_t index, const char** key, const char** value) const;

  size_t GetHeaderSize() const;
  bool IsPic() const;
  bool IsDebuggable() const;

 private:
  OatHeader(InstructionSet instruction_set,
            const InstructionSetFeatures* instruction_set_features,
            uint32_t dex_file_count,
            const SafeMap<std::string, std::string>* variable_data);

  // Returns true if the value of the given key is "true", false otherwise.
  bool IsKeyEnabled(const char* key) const;

  void Flatten(const SafeMap<std::string, std::string>* variable_data);

  uint8_t magic_[4];
  uint8_t version_[4];
  uint32_t adler32_checksum_;

  InstructionSet instruction_set_;
  uint32_t instruction_set_features_bitmap_;
  uint32_t dex_file_count_;
  uint32_t executable_offset_;
  uint32_t interpreter_to_interpreter_bridge_offset_;
  uint32_t interpreter_to_compiled_code_bridge_offset_;
  uint32_t jni_dlsym_lookup_offset_;
  uint32_t quick_generic_jni_trampoline_offset_;
  uint32_t quick_imt_conflict_trampoline_offset_;
  uint32_t quick_resolution_trampoline_offset_;
  uint32_t quick_to_interpreter_bridge_offset_;

  // The amount that the image this oat is associated with has been patched.
  int32_t image_patch_delta_;

  uint32_t image_file_location_oat_checksum_;
  uint32_t image_file_location_oat_data_begin_;

  uint32_t key_value_store_size_;
  uint8_t key_value_store_[0];  // note variable width data at end

  DISALLOW_COPY_AND_ASSIGN(OatHeader);
};

// OatMethodOffsets are currently 5x32-bits=160-bits long, so if we can
// save even one OatMethodOffsets struct, the more complicated encoding
// using a bitmap pays for itself since few classes will have 160
// methods.
enum OatClassType {
  kOatClassAllCompiled = 0,   // OatClass is followed by an OatMethodOffsets for each method.
  kOatClassSomeCompiled = 1,  // A bitmap of which OatMethodOffsets are present follows the OatClass.
  kOatClassNoneCompiled = 2,  // All methods are interpreted so no OatMethodOffsets are necessary.
  kOatClassMax = 3,
};

std::ostream& operator<<(std::ostream& os, const OatClassType& rhs);

class PACKED(4) OatMethodOffsets {
 public:
  OatMethodOffsets(uint32_t code_offset = 0);

  ~OatMethodOffsets();

  OatMethodOffsets& operator=(const OatMethodOffsets&) = default;

  uint32_t code_offset_;
};

}  // namespace art

#endif  // ART_RUNTIME_OAT_H_