150 lines
4.6 KiB
C++
150 lines
4.6 KiB
C++
// compressed_output.cc -- manage compressed output sections for gold
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// Copyright 2007 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#ifdef HAVE_ZLIB_H
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#include <zlib.h>
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#endif
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#include "parameters.h"
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#include "options.h"
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#include "compressed_output.h"
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namespace gold
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{
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// Compress UNCOMPRESSED_DATA of size UNCOMPRESSED_SIZE. Returns true
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// if it successfully compressed, false if it failed for any reason
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// (including not having zlib support in the library). If it returns
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// true, it allocates memory for the compressed data using new, and
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// sets *COMPRESSED_DATA and *COMPRESSED_SIZE to appropriate values.
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#ifdef HAVE_ZLIB_H
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static bool
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zlib_compress(const char* uncompressed_data, unsigned long uncompressed_size,
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char** compressed_data, unsigned long* compressed_size)
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{
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*compressed_size = uncompressed_size + uncompressed_size / 1000 + 128;
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*compressed_data = new char[*compressed_size];
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int compress_level;
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if (parameters->optimization_level() >= 1)
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compress_level = 9;
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else
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compress_level = 1;
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int rc = compress2(reinterpret_cast<Bytef*>(*compressed_data),
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compressed_size,
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reinterpret_cast<const Bytef*>(uncompressed_data),
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uncompressed_size,
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compress_level);
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if (rc == Z_OK)
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return true;
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else
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{
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delete[] *compressed_data;
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*compressed_data = NULL;
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return false;
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}
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}
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#else // !defined(HAVE_ZLIB_H)
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static bool
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zlib_compress(const char*, unsigned long, char**, unsigned long*)
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{
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return false;
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}
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#endif // !defined(HAVE_ZLIB_H)
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// After compressing an output section, we rename it from foo to
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// foo.zlib.nnnn, where nnnn is the uncompressed size of the section.
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static std::string
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zlib_compressed_suffix(unsigned long uncompressed_size)
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{
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char size_string[64];
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snprintf(size_string, sizeof(size_string), "%lu", uncompressed_size);
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return std::string(".zlib.") + size_string;
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}
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// Class Output_compressed_section.
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// Set the final data size of a compressed section. This is where
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// we actually compress the section data.
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void
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Output_compressed_section::set_final_data_size()
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{
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off_t uncompressed_size = this->postprocessing_buffer_size();
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// (Try to) compress the data.
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unsigned long compressed_size;
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unsigned char* u_uncompressed_data = this->postprocessing_buffer();
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char* uncompressed_data = reinterpret_cast<char*>(u_uncompressed_data);
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// At this point the contents of all regular input sections will
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// have been copied into the postprocessing buffer, and relocations
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// will have been applied. Now we need to copy in the contents of
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// anything other than a regular input section.
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this->write_to_postprocessing_buffer();
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bool success = false;
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if (this->options_->zlib_compress_debug_sections())
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success = zlib_compress(uncompressed_data, uncompressed_size,
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&this->data_, &compressed_size);
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if (success)
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{
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std::string suffix(zlib_compressed_suffix(uncompressed_size));
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this->new_section_name_ = std::string(this->name()) + suffix;
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this->set_name(this->new_section_name_.c_str());
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this->set_data_size(compressed_size);
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}
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else
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{
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gold_warning(_("not compressing section data: zlib error"));
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gold_assert(this->data_ == NULL);
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this->set_data_size(uncompressed_size);
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}
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}
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// Write out a compressed section. If we couldn't compress, we just
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// write it out as normal, uncompressed data.
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void
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Output_compressed_section::do_write(Output_file* of)
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{
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off_t offset = this->offset();
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off_t data_size = this->data_size();
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unsigned char* view = of->get_output_view(offset, data_size);
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if (this->data_ == NULL)
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memcpy(view, this->postprocessing_buffer(), data_size);
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else
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memcpy(view, this->data_, data_size);
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of->write_output_view(offset, data_size, view);
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}
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} // End namespace gold.
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