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99 lines
3.3 KiB
99 lines
3.3 KiB
/*
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* Copyright (C) 2016 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_LIBELFFILE_DWARF_DEBUG_ABBREV_WRITER_H_
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#define ART_LIBELFFILE_DWARF_DEBUG_ABBREV_WRITER_H_
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#include <cstdint>
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#include <type_traits>
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#include <unordered_map>
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#include "base/casts.h"
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#include "base/leb128.h"
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#include "base/stl_util.h"
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#include "dwarf/dwarf_constants.h"
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#include "dwarf/writer.h"
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namespace art {
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namespace dwarf {
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// Writer for the .debug_abbrev.
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//
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// Abbreviations specify the format of entries in .debug_info.
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// Each entry specifies abbreviation code, which in turns
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// determines all the attributes and their format.
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// It is possible to think of them as type definitions.
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template <typename Vector = std::vector<uint8_t>>
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class DebugAbbrevWriter final : private Writer<Vector> {
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static_assert(std::is_same<typename Vector::value_type, uint8_t>::value, "Invalid value type");
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public:
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explicit DebugAbbrevWriter(Vector* buffer)
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: Writer<Vector>(buffer),
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current_abbrev_(buffer->get_allocator()) {
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this->PushUint8(0); // Add abbrev table terminator.
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}
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// Start abbreviation declaration.
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void StartAbbrev(Tag tag) {
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DCHECK(current_abbrev_.empty());
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EncodeUnsignedLeb128(¤t_abbrev_, tag);
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has_children_offset_ = current_abbrev_.size();
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current_abbrev_.push_back(0); // Place-holder for DW_CHILDREN.
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}
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// Add attribute specification.
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void AddAbbrevAttribute(Attribute name, Form type) {
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EncodeUnsignedLeb128(¤t_abbrev_, name);
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EncodeUnsignedLeb128(¤t_abbrev_, type);
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}
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// End abbreviation declaration and return its code.
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// This will deduplicate abbreviations.
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uint32_t EndAbbrev(Children has_children) {
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DCHECK(!current_abbrev_.empty());
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current_abbrev_[has_children_offset_] = has_children;
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auto it = abbrev_codes_.insert(std::make_pair(std::move(current_abbrev_), NextAbbrevCode()));
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uint32_t abbrev_code = it.first->second;
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if (UNLIKELY(it.second)) { // Inserted new entry.
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const Vector& abbrev = it.first->first;
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this->Pop(); // Remove abbrev table terminator.
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this->PushUleb128(abbrev_code);
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this->PushData(abbrev.data(), abbrev.size());
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this->PushUint8(0); // Attribute list end.
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this->PushUint8(0); // Attribute list end.
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this->PushUint8(0); // Add abbrev table terminator.
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}
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current_abbrev_.clear();
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return abbrev_code;
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}
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// Get the next free abbrev code.
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uint32_t NextAbbrevCode() {
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return dchecked_integral_cast<uint32_t>(1 + abbrev_codes_.size());
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}
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private:
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Vector current_abbrev_;
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size_t has_children_offset_ = 0;
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std::unordered_map<Vector, uint32_t, FNVHash<Vector> > abbrev_codes_;
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};
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} // namespace dwarf
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} // namespace art
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#endif // ART_LIBELFFILE_DWARF_DEBUG_ABBREV_WRITER_H_
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