119 lines
4.4 KiB
C++
119 lines
4.4 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
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#define ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
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#include "dex_cache_arrays_layout.h"
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#include "base/bit_utils.h"
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#include "base/logging.h"
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#include "gc_root.h"
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#include "globals.h"
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#include "primitive.h"
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namespace art {
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inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size,
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const DexFile::Header& header)
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: pointer_size_(pointer_size),
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/* types_offset_ is always 0u, so it's constexpr */
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methods_offset_(
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RoundUp(types_offset_ + TypesSize(header.type_ids_size_), MethodsAlignment())),
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strings_offset_(
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RoundUp(methods_offset_ + MethodsSize(header.method_ids_size_), StringsAlignment())),
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fields_offset_(
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RoundUp(strings_offset_ + StringsSize(header.string_ids_size_), FieldsAlignment())),
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size_(
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RoundUp(fields_offset_ + FieldsSize(header.field_ids_size_), Alignment())) {
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DCHECK(ValidPointerSize(pointer_size)) << pointer_size;
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}
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inline DexCacheArraysLayout::DexCacheArraysLayout(size_t pointer_size, const DexFile* dex_file)
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: DexCacheArraysLayout(pointer_size, dex_file->GetHeader()) {
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}
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inline size_t DexCacheArraysLayout::Alignment() const {
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// GcRoot<> alignment is 4, i.e. lower than or equal to the pointer alignment.
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static_assert(alignof(GcRoot<mirror::Class>) == 4, "Expecting alignof(GcRoot<>) == 4");
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static_assert(alignof(GcRoot<mirror::String>) == 4, "Expecting alignof(GcRoot<>) == 4");
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DCHECK(pointer_size_ == 4u || pointer_size_ == 8u);
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// Pointer alignment is the same as pointer size.
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return pointer_size_;
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}
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inline size_t DexCacheArraysLayout::TypeOffset(uint32_t type_idx) const {
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return types_offset_ + ElementOffset(sizeof(GcRoot<mirror::Class>), type_idx);
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}
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inline size_t DexCacheArraysLayout::TypesSize(size_t num_elements) const {
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// App image patching relies on having enough room for a forwarding pointer in the types array.
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// See FixupArtMethodArrayVisitor and ClassLinker::AddImageSpace.
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return std::max(ArraySize(sizeof(GcRoot<mirror::Class>), num_elements), pointer_size_);
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}
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inline size_t DexCacheArraysLayout::TypesAlignment() const {
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return alignof(GcRoot<mirror::Class>);
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}
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inline size_t DexCacheArraysLayout::MethodOffset(uint32_t method_idx) const {
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return methods_offset_ + ElementOffset(pointer_size_, method_idx);
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}
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inline size_t DexCacheArraysLayout::MethodsSize(size_t num_elements) const {
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// App image patching relies on having enough room for a forwarding pointer in the methods array.
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return std::max(ArraySize(pointer_size_, num_elements), pointer_size_);
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}
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inline size_t DexCacheArraysLayout::MethodsAlignment() const {
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return pointer_size_;
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}
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inline size_t DexCacheArraysLayout::StringOffset(uint32_t string_idx) const {
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return strings_offset_ + ElementOffset(sizeof(GcRoot<mirror::String>), string_idx);
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}
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inline size_t DexCacheArraysLayout::StringsSize(size_t num_elements) const {
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return ArraySize(sizeof(GcRoot<mirror::String>), num_elements);
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}
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inline size_t DexCacheArraysLayout::StringsAlignment() const {
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return alignof(GcRoot<mirror::String>);
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}
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inline size_t DexCacheArraysLayout::FieldOffset(uint32_t field_idx) const {
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return fields_offset_ + ElementOffset(pointer_size_, field_idx);
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}
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inline size_t DexCacheArraysLayout::FieldsSize(size_t num_elements) const {
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return ArraySize(pointer_size_, num_elements);
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}
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inline size_t DexCacheArraysLayout::FieldsAlignment() const {
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return pointer_size_;
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}
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inline size_t DexCacheArraysLayout::ElementOffset(size_t element_size, uint32_t idx) {
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return element_size * idx;
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}
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inline size_t DexCacheArraysLayout::ArraySize(size_t element_size, uint32_t num_elements) {
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return element_size * num_elements;
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}
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} // namespace art
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#endif // ART_RUNTIME_UTILS_DEX_CACHE_ARRAYS_LAYOUT_INL_H_
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