URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gold/] [compressed_output.cc] - Rev 207
Go to most recent revision | Compare with Previous | Blame | View Log
// compressed_output.cc -- manage compressed output sections for gold // Copyright 2007, 2008 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 "options.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. // It also writes a header before COMPRESSED_DATA: 4 bytes saying // "ZLIB", and 8 bytes indicating the uncompressed size, in big-endian // order. #ifdef HAVE_ZLIB_H static bool zlib_compress(const unsigned char* uncompressed_data, unsigned long uncompressed_size, unsigned char** compressed_data, unsigned long* compressed_size) { const int header_size = 12; *compressed_size = uncompressed_size + uncompressed_size / 1000 + 128; *compressed_data = new unsigned char[*compressed_size + header_size]; int compress_level; if (parameters->options().optimize() >= 1) compress_level = 9; else compress_level = 1; int rc = compress2(reinterpret_cast<Bytef*>(*compressed_data) + header_size, compressed_size, reinterpret_cast<const Bytef*>(uncompressed_data), uncompressed_size, compress_level); if (rc == Z_OK) { memcpy(*compressed_data, "ZLIB", 4); elfcpp::Swap_unaligned<64, true>::writeval(*compressed_data + 4, uncompressed_size); *compressed_size += header_size; return true; } else { delete[] *compressed_data; *compressed_data = NULL; return false; } } #else // !defined(HAVE_ZLIB_H) static bool zlib_compress(const unsigned char*, unsigned long, unsigned char**, unsigned long*) { return false; } #endif // !defined(HAVE_ZLIB_H) // 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* uncompressed_data = this->postprocessing_buffer(); // 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 (strcmp(this->options_->compress_debug_sections(), "zlib") == 0) success = zlib_compress(uncompressed_data, uncompressed_size, &this->data_, &compressed_size); if (success) { // This converts .debug_foo to .zdebug_foo this->new_section_name_ = std::string(".z") + (this->name() + 1); 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.
Go to most recent revision | Compare with Previous | Blame | View Log