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