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