runtime/image-inl.h

/*
 * Copyright (C) 2016 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_IMAGE_INL_H_
#define ART_RUNTIME_IMAGE_INL_H_

#include "image.h"

#include "art_method.h"
#include "imt_conflict_table.h"
#include "imtable.h"
#include "mirror/object_array-inl.h"
#include "obj_ptr-inl.h"
#include "read_barrier-inl.h"

namespace art {

template <ReadBarrierOption kReadBarrierOption>
inline ObjPtr<mirror::Object> ImageHeader::GetImageRoot(ImageRoot image_root) const {
  ObjPtr<mirror::ObjectArray<mirror::Object>> image_roots = GetImageRoots<kReadBarrierOption>();
  return image_roots->Get<kVerifyNone, kReadBarrierOption>(static_cast<int32_t>(image_root));
}

template <ReadBarrierOption kReadBarrierOption>
inline ObjPtr<mirror::ObjectArray<mirror::Object>> ImageHeader::GetImageRoots() const {
  // Need a read barrier as it's not visited during root scan.
  // Pass in the address of the local variable to the read barrier
  // rather than image_roots_ because it won't move (asserted below)
  // and it's a const member.
  mirror::ObjectArray<mirror::Object>* image_roots =
      reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_);
  mirror::ObjectArray<mirror::Object>* result =
      ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Object>, kReadBarrierOption>(
          &image_roots);
  DCHECK_EQ(image_roots, result);
  return image_roots;
}

inline void ImageHeader::VisitPackedArtFields(ArtFieldVisitor* visitor, uint8_t* base) const {
  const ImageSection& fields = GetFieldsSection();
  for (size_t pos = 0; pos < fields.Size(); ) {
    auto* array = reinterpret_cast<LengthPrefixedArray<ArtField>*>(base + fields.Offset() + pos);
    for (size_t i = 0; i < array->size(); ++i) {
      visitor->Visit(&array->At(i, sizeof(ArtField)));
    }
    pos += array->ComputeSize(array->size());
  }
}

inline void ImageHeader::VisitPackedArtMethods(ArtMethodVisitor* visitor,
                                        uint8_t* base,
                                        PointerSize pointer_size) const {
  const size_t method_alignment = ArtMethod::Alignment(pointer_size);
  const size_t method_size = ArtMethod::Size(pointer_size);
  const ImageSection& methods = GetMethodsSection();
  for (size_t pos = 0; pos < methods.Size(); ) {
    auto* array = reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(base + methods.Offset() + pos);
    for (size_t i = 0; i < array->size(); ++i) {
      visitor->Visit(&array->At(i, method_size, method_alignment));
    }
    pos += array->ComputeSize(array->size(), method_size, method_alignment);
  }
  const ImageSection& runtime_methods = GetRuntimeMethodsSection();
  for (size_t pos = 0; pos < runtime_methods.Size(); ) {
    auto* method = reinterpret_cast<ArtMethod*>(base + runtime_methods.Offset() + pos);
    visitor->Visit(method);
    pos += method_size;
  }
}

template <typename Visitor>
inline void ImageHeader::VisitPackedImTables(const Visitor& visitor,
                                             uint8_t* base,
                                             PointerSize pointer_size) const {
  const ImageSection& section = GetImTablesSection();
  for (size_t pos = 0; pos < section.Size();) {
    ImTable* imt = reinterpret_cast<ImTable*>(base + section.Offset() + pos);
    for (size_t i = 0; i < ImTable::kSize; ++i) {
      ArtMethod* orig = imt->Get(i, pointer_size);
      ArtMethod* updated = visitor(orig);
      if (updated != orig) {
        imt->Set(i, updated, pointer_size);
      }
    }
    pos += ImTable::SizeInBytes(pointer_size);
  }
}

template <typename Visitor>
inline void ImageHeader::VisitPackedImtConflictTables(const Visitor& visitor,
                                                      uint8_t* base,
                                                      PointerSize pointer_size) const {
  const ImageSection& section = GetIMTConflictTablesSection();
  for (size_t pos = 0; pos < section.Size(); ) {
    auto* table = reinterpret_cast<ImtConflictTable*>(base + section.Offset() + pos);
    table->Visit([&visitor](const std::pair<ArtMethod*, ArtMethod*>& methods) {
      return std::make_pair(visitor(methods.first), visitor(methods.second));
    }, pointer_size);
    pos += table->ComputeSize(pointer_size);
  }
}

}  // namespace art

#endif  // ART_RUNTIME_IMAGE_INL_H_