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