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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [compressed_output.cc] - Rev 144
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// compressed_output.cc -- manage compressed debug sections for gold // Copyright 2007, 2008, 2010 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 { #ifdef HAVE_ZLIB_H // 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. 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; } } // Decompress COMPRESSED_DATA of size COMPRESSED_SIZE, into a buffer // UNCOMPRESSED_DATA of size UNCOMPRESSED_SIZE. Returns TRUE if it // decompressed successfully, false if it failed. The buffer, of // appropriate size, is provided by the caller, and is typically part // of the memory-mapped output file. static bool zlib_decompress(const unsigned char* compressed_data, unsigned long compressed_size, unsigned char* uncompressed_data, unsigned long uncompressed_size) { z_stream strm; int rc; /* It is possible the section consists of several compressed buffers concatenated together, so we uncompress in a loop. */ strm.zalloc = NULL; strm.zfree = NULL; strm.opaque = NULL; strm.avail_in = compressed_size; strm.next_in = const_cast<Bytef*>(compressed_data); strm.avail_out = uncompressed_size; rc = inflateInit(&strm); while (strm.avail_in > 0) { if (rc != Z_OK) return false; strm.next_out = ((Bytef*) uncompressed_data + (uncompressed_size - strm.avail_out)); rc = inflate(&strm, Z_FINISH); if (rc != Z_STREAM_END) return false; rc = inflateReset(&strm); } rc = inflateEnd(&strm); if (rc != Z_OK || strm.avail_out != 0) return false; return true; } #else // !defined(HAVE_ZLIB_H) static bool zlib_compress(const unsigned char*, unsigned long, unsigned char**, unsigned long*) { return false; } static bool zlib_decompress(const unsigned char*, unsigned long, unsigned char*, unsigned long) { return false; } #endif // !defined(HAVE_ZLIB_H) // Read the compression header of a compressed debug section and return // the uncompressed size. uint64_t get_uncompressed_size(const unsigned char* compressed_data, section_size_type compressed_size) { const unsigned int zlib_header_size = 12; /* Verify the compression header. Currently, we support only zlib compression, so it should be "ZLIB" followed by the uncompressed section size, 8 bytes in big-endian order. */ if (compressed_size >= zlib_header_size && strncmp(reinterpret_cast<const char*>(compressed_data), "ZLIB", 4) == 0) return elfcpp::Swap_unaligned<64, true>::readval(compressed_data + 4); return -1ULL; } // Decompress a compressed debug section directly into the output file. bool decompress_input_section(const unsigned char* compressed_data, unsigned long compressed_size, unsigned char* uncompressed_data, unsigned long uncompressed_size) { const unsigned int zlib_header_size = 12; /* Verify the compression header. Currently, we support only zlib compression, so it should be "ZLIB" followed by the uncompressed section size, 8 bytes in big-endian order. */ if (compressed_size >= zlib_header_size && strncmp(reinterpret_cast<const char*>(compressed_data), "ZLIB", 4) == 0) { unsigned long uncompressed_size_check = elfcpp::Swap_unaligned<64, true>::readval(compressed_data + 4); gold_assert(uncompressed_size_check == uncompressed_size); return zlib_decompress(compressed_data + zlib_header_size, compressed_size - zlib_header_size, uncompressed_data, uncompressed_size); } return false; } // 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.
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