// target.cc // Copyright 2009 Free Software Foundation, Inc. // Written by Doug Kwan . // 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" #include "target.h" #include "dynobj.h" namespace gold { // Return whether NAME is a local label name. This is used to implement the // --discard-locals options and can be overriden by children classes to // implement system-specific behaviour. The logic here is the same as that // in _bfd_elf_is_local_label_name(). bool Target::do_is_local_label_name (const char* name) const { // Normal local symbols start with ``.L''. if (name[0] == '.' && name[1] == 'L') return true; // At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate // DWARF debugging symbols starting with ``..''. if (name[0] == '.' && name[1] == '.') return true; // gcc will sometimes generate symbols beginning with ``_.L_'' when // emitting DWARF debugging output. I suspect this is actually a // small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call // ASM_GENERATE_INTERNAL_LABEL, and this causes the leading // underscore to be emitted on some ELF targets). For ease of use, // we treat such symbols as local. if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_') return true; return false; } // Implementations of methods Target::do_make_elf_object are almost identical // except for the address sizes and endianities. So we extract this // into a template. template inline Object* Target::do_make_elf_object_implementation( const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr& ehdr) { int et = ehdr.get_e_type(); if (et == elfcpp::ET_REL) { Sized_relobj* obj = new Sized_relobj(name, input_file, offset, ehdr); obj->setup(); return obj; } else if (et == elfcpp::ET_DYN) { Sized_dynobj* obj = new Sized_dynobj(name, input_file, offset, ehdr); obj->setup(); return obj; } else { gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); return NULL; } } // Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR // is the ELF header of the object. There are four versions of this // for different address sizes and endianities. #ifdef HAVE_TARGET_32_LITTLE Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<32, false>& ehdr) { return this->do_make_elf_object_implementation<32, false>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_32_BIG Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<32, true>& ehdr) { return this->do_make_elf_object_implementation<32, true>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_64_LITTLE Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<64, false>& ehdr) { return this->do_make_elf_object_implementation<64, false>(name, input_file, offset, ehdr); } #endif #ifdef HAVE_TARGET_64_BIG Object* Target::do_make_elf_object(const std::string& name, Input_file* input_file, off_t offset, const elfcpp::Ehdr<64, true>& ehdr) { return this->do_make_elf_object_implementation<64, true>(name, input_file, offset, ehdr); } #endif } // End namespace gold.