112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
/*
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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_COMPILER_DEBUG_ELF_GNU_DEBUGDATA_WRITER_H_
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#define ART_COMPILER_DEBUG_ELF_GNU_DEBUGDATA_WRITER_H_
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#include <vector>
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#include "arch/instruction_set.h"
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#include "elf_builder.h"
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#include "linker/vector_output_stream.h"
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// liblzma.
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#include "7zCrc.h"
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#include "XzCrc64.h"
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#include "XzEnc.h"
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namespace art {
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namespace debug {
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static void XzCompress(const std::vector<uint8_t>* src, std::vector<uint8_t>* dst) {
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// Configure the compression library.
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CrcGenerateTable();
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Crc64GenerateTable();
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CLzma2EncProps lzma2Props;
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Lzma2EncProps_Init(&lzma2Props);
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lzma2Props.lzmaProps.level = 1; // Fast compression.
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Lzma2EncProps_Normalize(&lzma2Props);
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CXzProps props;
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XzProps_Init(&props);
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props.lzma2Props = &lzma2Props;
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// Implement the required interface for communication (written in C so no virtual methods).
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struct XzCallbacks : public ISeqInStream, public ISeqOutStream, public ICompressProgress {
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static SRes ReadImpl(void* p, void* buf, size_t* size) {
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auto* ctx = static_cast<XzCallbacks*>(reinterpret_cast<ISeqInStream*>(p));
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*size = std::min(*size, ctx->src_->size() - ctx->src_pos_);
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memcpy(buf, ctx->src_->data() + ctx->src_pos_, *size);
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ctx->src_pos_ += *size;
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return SZ_OK;
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}
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static size_t WriteImpl(void* p, const void* buf, size_t size) {
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auto* ctx = static_cast<XzCallbacks*>(reinterpret_cast<ISeqOutStream*>(p));
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const uint8_t* buffer = reinterpret_cast<const uint8_t*>(buf);
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ctx->dst_->insert(ctx->dst_->end(), buffer, buffer + size);
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return size;
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}
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static SRes ProgressImpl(void* , UInt64, UInt64) {
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return SZ_OK;
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}
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size_t src_pos_;
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const std::vector<uint8_t>* src_;
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std::vector<uint8_t>* dst_;
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};
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XzCallbacks callbacks;
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callbacks.Read = XzCallbacks::ReadImpl;
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callbacks.Write = XzCallbacks::WriteImpl;
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callbacks.Progress = XzCallbacks::ProgressImpl;
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callbacks.src_pos_ = 0;
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callbacks.src_ = src;
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callbacks.dst_ = dst;
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// Compress.
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SRes res = Xz_Encode(&callbacks, &callbacks, &props, &callbacks);
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CHECK_EQ(res, SZ_OK);
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}
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template <typename ElfTypes>
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static std::vector<uint8_t> MakeMiniDebugInfoInternal(
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InstructionSet isa,
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const InstructionSetFeatures* features,
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size_t rodata_section_size,
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size_t text_section_size,
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const ArrayRef<const MethodDebugInfo>& method_infos) {
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std::vector<uint8_t> buffer;
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buffer.reserve(KB);
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VectorOutputStream out("Mini-debug-info ELF file", &buffer);
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std::unique_ptr<ElfBuilder<ElfTypes>> builder(new ElfBuilder<ElfTypes>(isa, features, &out));
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builder->Start();
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// Mirror .rodata and .text as NOBITS sections.
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// It is needed to detected relocations after compression.
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builder->GetRoData()->WriteNoBitsSection(rodata_section_size);
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builder->GetText()->WriteNoBitsSection(text_section_size);
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WriteDebugSymbols(builder.get(), method_infos, false /* with_signature */);
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WriteCFISection(builder.get(),
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method_infos,
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dwarf::DW_DEBUG_FRAME_FORMAT,
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false /* write_oat_paches */);
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builder->End();
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CHECK(builder->Good());
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std::vector<uint8_t> compressed_buffer;
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compressed_buffer.reserve(buffer.size() / 4);
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XzCompress(&buffer, &compressed_buffer);
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return compressed_buffer;
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}
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} // namespace debug
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} // namespace art
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#endif // ART_COMPILER_DEBUG_ELF_GNU_DEBUGDATA_WRITER_H_
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