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/*
* Copyright (C) 2015 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_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_
#define ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_
#include "dex_file.h"
namespace art {
/**
* @class DexCacheArraysLayout
* @details This class provides the layout information for the type, method, field and
* string arrays for a DexCache with a fixed arrays' layout (such as in the boot image),
*/
class DexCacheArraysLayout {
public:
// Construct an invalid layout.
DexCacheArraysLayout()
: /* types_offset_ is always 0u */
pointer_size_(kRuntimePointerSize),
methods_offset_(0u),
strings_offset_(0u),
fields_offset_(0u),
size_(0u) {
}
// Construct a layout for a particular dex file header.
DexCacheArraysLayout(PointerSize pointer_size, const DexFile::Header& header);
// Construct a layout for a particular dex file.
DexCacheArraysLayout(PointerSize pointer_size, const DexFile* dex_file);
bool Valid() const {
return Size() != 0u;
}
size_t Size() const {
return size_;
}
static constexpr size_t Alignment();
size_t TypesOffset() const {
return types_offset_;
}
size_t TypeOffset(uint32_t type_idx) const;
size_t TypesSize(size_t num_elements) const;
size_t TypesAlignment() const;
size_t MethodsOffset() const {
return methods_offset_;
}
size_t MethodOffset(uint32_t method_idx) const;
size_t MethodsSize(size_t num_elements) const;
size_t MethodsAlignment() const;
size_t StringsOffset() const {
return strings_offset_;
}
size_t StringOffset(uint32_t string_idx) const;
size_t StringsSize(size_t num_elements) const;
size_t StringsAlignment() const;
size_t FieldsOffset() const {
return fields_offset_;
}
size_t FieldOffset(uint32_t field_idx) const;
size_t FieldsSize(size_t num_elements) const;
size_t FieldsAlignment() const;
private:
static constexpr size_t types_offset_ = 0u;
const PointerSize pointer_size_; // Must be first for construction initialization order.
const size_t methods_offset_;
const size_t strings_offset_;
const size_t fields_offset_;
const size_t size_;
static size_t Alignment(PointerSize pointer_size);
static size_t ElementOffset(PointerSize element_size, uint32_t idx);
static size_t ArraySize(PointerSize element_size, uint32_t num_elements);
};
} // namespace art
#endif // ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_H_
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