// object.cc -- support for an object file for linking in gold
+// Copyright 2006, 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"
#include <cerrno>
#include <cstring>
-#include <cassert>
#include <cstdarg>
#include "target-select.h"
// Return a view of the contents of a section.
const unsigned char*
-Object::section_contents(unsigned int shndx, off_t* plen)
+Object::section_contents(unsigned int shndx, off_t* plen, bool cache)
{
Location loc(this->do_section_contents(shndx));
*plen = loc.data_size;
- return this->get_view(loc.file_offset, loc.data_size);
+ return this->get_view(loc.file_offset, loc.data_size, cache);
}
// Read the section data into SD. This is code common to Sized_relobj
// Read the section headers.
const off_t shoff = elf_file->shoff();
const unsigned int shnum = this->shnum();
- sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size);
+ sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, true);
// Read the section names.
const unsigned char* pshdrs = sd->section_headers->data();
sd->section_names_size = shdrnames.get_sh_size();
sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
- sd->section_names_size);
+ sd->section_names_size, false);
}
// If NAME is the name of a special .gnu.warning section, arrange for
output_local_symbol_count_(0),
symbols_(NULL),
local_symbol_offset_(0),
- values_(NULL)
+ local_values_()
{
}
// Get the symbol table section header.
typename This::Shdr symtabshdr(pshdrs
+ this->symtab_shndx_ * This::shdr_size);
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
// We only need the external symbols.
const int sym_size = This::sym_size;
off_t extsize = symtabshdr.get_sh_size() - locsize;
// Read the symbol table.
- File_view* fvsymtab = this->get_lasting_view(extoff, extsize);
+ File_view* fvsymtab = this->get_lasting_view(extoff, extsize, false);
// Read the section header for the symbol names.
unsigned int strtab_shndx = symtabshdr.get_sh_link();
// Read the symbol names.
File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size());
+ strtabshdr.get_sh_size(), true);
sd->symbols = fvsymtab;
sd->symbols_size = extsize;
{
// Read the section contents.
const unsigned char* pcon = this->get_view(shdr.get_sh_offset(),
- shdr.get_sh_size());
+ shdr.get_sh_size(), false);
const elfcpp::Elf_Word* pword =
reinterpret_cast<const elfcpp::Elf_Word*>(pcon);
gold_exit(false);
}
off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size;
- const unsigned char* psym = this->get_view(symoff, This::sym_size);
+ const unsigned char* psym = this->get_view(symoff, This::sym_size, true);
elfcpp::Sym<size, big_endian> sym(psym);
// Read the symbol table names.
off_t symnamelen;
const unsigned char* psymnamesu;
- psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen);
+ psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen,
+ true);
const char* psymnames = reinterpret_cast<const char*>(psymnamesu);
// Get the section group signature.
template<int size, bool big_endian>
void
-Sized_relobj<size, big_endian>::do_layout(const General_options& options,
- Symbol_table* symtab,
+Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab,
Layout* layout,
Read_symbols_data* sd)
{
if (this->handle_gnu_warning_section(name, i, symtab))
{
- if (!options.is_relocatable())
+ if (!parameters->output_is_object())
omit[i] = true;
}
if (!this->include_section_group(layout, i, shdr, &omit))
discard = true;
}
- else if (Layout::is_linkonce(name))
+ else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0
+ && Layout::is_linkonce(name))
{
if (!this->include_linkonce_section(layout, name, shdr))
discard = true;
{
if (sd->symbols == NULL)
{
- assert(sd->symbol_names == NULL);
+ gold_assert(sd->symbol_names == NULL);
return;
}
const char* sym_names =
reinterpret_cast<const char*>(sd->symbol_names->data());
- symtab->add_from_relobj(this, sd->symbols->data(), symcount, sym_names,
+ symtab->add_from_relobj(this, sd->symbols->data(), symcount, sym_names,
sd->symbol_names_size, this->symbols_);
delete sd->symbols;
// Finalize the local symbols. Here we record the file offset at
// which they should be output, we add their names to *POOL, and we
-// add their values to THIS->VALUES_. Return the new file offset.
+// add their values to THIS->LOCAL_VALUES_. Return the symbol index.
// This function is always called from the main thread. The actual
// output of the local symbols will occur in a separate task.
template<int size, bool big_endian>
-off_t
-Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
+unsigned int
+Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
+ off_t off,
Stringpool* pool)
{
- assert(this->symtab_shndx_ != -1U);
+ gold_assert(this->symtab_shndx_ != -1U);
if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
- return off;
+ return index;
}
- off = align_address(off, size >> 3);
+ gold_assert(off == static_cast<off_t>(align_address(off, size >> 3)));
this->local_symbol_offset_ = off;
const unsigned int symtab_shndx = this->symtab_shndx_;
typename This::Shdr symtabshdr(this,
this->elf_file_.section_header(symtab_shndx));
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
// Read the local symbols.
const int sym_size = This::sym_size;
const unsigned int loccount = this->local_symbol_count_;
- assert(loccount == symtabshdr.get_sh_info());
+ gold_assert(loccount == symtabshdr.get_sh_info());
off_t locsize = loccount * sym_size;
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
- locsize);
+ locsize, true);
- this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount];
+ this->local_values_.resize(loccount);
// Read the symbol names.
const unsigned int strtab_shndx = symtabshdr.get_sh_link();
off_t strtab_size;
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
- &strtab_size);
+ &strtab_size,
+ true);
const char* pnames = reinterpret_cast<const char*>(pnamesu);
// Loop over the local symbols.
- std::vector<Map_to_output>& mo(this->map_to_output());
+ const std::vector<Map_to_output>& mo(this->map_to_output());
unsigned int shnum = this->shnum();
unsigned int count = 0;
// Skip the first, dummy, symbol.
{
elfcpp::Sym<size, big_endian> sym(psyms);
+ Symbol_value<size>& lv(this->local_values_[i]);
+
unsigned int shndx = sym.get_st_shndx();
+ lv.set_input_shndx(shndx);
if (shndx >= elfcpp::SHN_LORESERVE)
{
if (shndx == elfcpp::SHN_ABS)
- this->values_[i] = sym.get_st_value();
+ lv.set_output_value(sym.get_st_value());
else
{
// FIXME: Handle SHN_XINDEX.
gold_exit(false);
}
- if (mo[shndx].output_section == NULL)
+ Output_section* os = mo[shndx].output_section;
+
+ if (os == NULL)
{
- this->values_[i] = 0;
+ lv.set_output_value(0);
+ lv.set_no_output_symtab_entry();
continue;
}
- this->values_[i] = (mo[shndx].output_section->address()
- + mo[shndx].offset
- + sym.get_st_value());
+ if (mo[shndx].offset == -1)
+ lv.set_input_value(sym.get_st_value());
+ else
+ lv.set_output_value(mo[shndx].output_section->address()
+ + mo[shndx].offset
+ + sym.get_st_value());
}
- if (sym.get_st_type() != elfcpp::STT_SECTION)
+ // Decide whether this symbol should go into the output file.
+
+ if (sym.get_st_type() == elfcpp::STT_SECTION)
{
- if (sym.get_st_name() >= strtab_size)
- {
- fprintf(stderr,
- _("%s: %s: local symbol %u section name "
- "out of range: %u >= %u\n"),
- program_name, this->name().c_str(),
- i, sym.get_st_name(),
- static_cast<unsigned int>(strtab_size));
- gold_exit(false);
- }
+ lv.set_no_output_symtab_entry();
+ continue;
+ }
- pool->add(pnames + sym.get_st_name(), NULL);
- off += sym_size;
- ++count;
+ if (sym.get_st_name() >= strtab_size)
+ {
+ fprintf(stderr,
+ _("%s: %s: local symbol %u section name "
+ "out of range: %u >= %u\n"),
+ program_name, this->name().c_str(),
+ i, sym.get_st_name(),
+ static_cast<unsigned int>(strtab_size));
+ gold_exit(false);
}
+
+ const char* name = pnames + sym.get_st_name();
+ pool->add(name, NULL);
+ lv.set_output_symtab_index(index);
+ ++index;
+ ++count;
}
this->output_local_symbol_count_ = count;
- return off;
+ return index;
+}
+
+// Return the value of a local symbol defined in input section SHNDX,
+// with value VALUE, adding addend ADDEND. This handles SHF_MERGE
+// sections.
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Sized_relobj<size, big_endian>::local_value(unsigned int shndx,
+ Address value,
+ Address addend) const
+{
+ const std::vector<Map_to_output>& mo(this->map_to_output());
+ Output_section* os = mo[shndx].output_section;
+ if (os == NULL)
+ return addend;
+ gold_assert(mo[shndx].offset == -1);
+ return os->output_address(this, shndx, value + addend);
}
// Write out the local symbols.
Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of,
const Stringpool* sympool)
{
- assert(this->symtab_shndx_ != -1U);
+ gold_assert(this->symtab_shndx_ != -1U);
if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
const unsigned int symtab_shndx = this->symtab_shndx_;
typename This::Shdr symtabshdr(this,
this->elf_file_.section_header(symtab_shndx));
- assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
+ gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
const unsigned int loccount = this->local_symbol_count_;
- assert(loccount == symtabshdr.get_sh_info());
+ gold_assert(loccount == symtabshdr.get_sh_info());
// Read the local symbols.
const int sym_size = This::sym_size;
off_t locsize = loccount * sym_size;
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
- locsize);
+ locsize, false);
// Read the symbol names.
const unsigned int strtab_shndx = symtabshdr.get_sh_link();
off_t strtab_size;
const unsigned char* pnamesu = this->section_contents(strtab_shndx,
- &strtab_size);
+ &strtab_size,
+ true);
const char* pnames = reinterpret_cast<const char*>(pnamesu);
// Get a view into the output file.
unsigned char* oview = of->get_output_view(this->local_symbol_offset_,
output_size);
- std::vector<Map_to_output>& mo(this->map_to_output());
+ const std::vector<Map_to_output>& mo(this->map_to_output());
+
+ gold_assert(this->local_values_.size() == loccount);
- psyms += sym_size;
unsigned char* ov = oview;
+ psyms += sym_size;
for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
{
elfcpp::Sym<size, big_endian> isym(psyms);
- if (isym.get_st_type() == elfcpp::STT_SECTION)
+ if (!this->local_values_[i].needs_output_symtab_entry())
continue;
unsigned int st_shndx = isym.get_st_shndx();
if (st_shndx < elfcpp::SHN_LORESERVE)
{
- assert(st_shndx < mo.size());
+ gold_assert(st_shndx < mo.size());
if (mo[st_shndx].output_section == NULL)
continue;
st_shndx = mo[st_shndx].output_section->out_shndx();
elfcpp::Sym_write<size, big_endian> osym(ov);
- assert(isym.get_st_name() < strtab_size);
- osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name()));
- osym.put_st_value(this->values_[i]);
+ gold_assert(isym.get_st_name() < strtab_size);
+ const char* name = pnames + isym.get_st_name();
+ osym.put_st_name(sympool->get_offset(name));
+ osym.put_st_value(this->local_values_[i].value(this, 0));
osym.put_st_size(isym.get_st_size());
osym.put_st_info(isym.get_st_info());
osym.put_st_other(isym.get_st_other());
ov += sym_size;
}
- assert(ov - oview == output_size);
+ gold_assert(ov - oview == output_size);
of->write_output_view(this->local_symbol_offset_, output_size, oview);
}
// Input_objects methods.
-// Add a regular relocatable object to the list.
+// Add a regular relocatable object to the list. Return false if this
+// object should be ignored.
-void
+bool
Input_objects::add_object(Object* obj)
{
- if (obj->is_dynamic())
- this->dynobj_list_.push_back(static_cast<Dynobj*>(obj));
- else
+ if (!obj->is_dynamic())
this->relobj_list_.push_back(static_cast<Relobj*>(obj));
+ else
+ {
+ // See if this is a duplicate SONAME.
+ Dynobj* dynobj = static_cast<Dynobj*>(obj);
+
+ std::pair<Unordered_set<std::string>::iterator, bool> ins =
+ this->sonames_.insert(dynobj->soname());
+ if (!ins.second)
+ {
+ // We have already seen a dynamic object with this soname.
+ return false;
+ }
+
+ this->dynobj_list_.push_back(dynobj);
+ }
Target* target = obj->target();
if (this->target_ == NULL)
program_name, obj->name().c_str());
gold_exit(false);
}
+
+ set_parameters_size_and_endianness(target->get_size(),
+ target->is_big_endian());
+
+ return true;
}
// Relocate_info methods.
}
if (big_endian)
{
+#ifdef HAVE_TARGET_32_BIG
elfcpp::Ehdr<32, true> ehdr(p);
return make_elf_sized_object<32, true>(name, input_file,
offset, ehdr);
+#else
+ fprintf(stderr,
+ _("%s: %s: not configured to support 32-bit big-endian object\n"),
+ program_name, name.c_str());
+ gold_exit(false);
+#endif
}
else
{
+#ifdef HAVE_TARGET_32_LITTLE
elfcpp::Ehdr<32, false> ehdr(p);
return make_elf_sized_object<32, false>(name, input_file,
offset, ehdr);
+#else
+ fprintf(stderr,
+ _("%s: %s: not configured to support 32-bit little-endian object\n"),
+ program_name, name.c_str());
+ gold_exit(false);
+#endif
}
}
else
}
if (big_endian)
{
+#ifdef HAVE_TARGET_64_BIG
elfcpp::Ehdr<64, true> ehdr(p);
return make_elf_sized_object<64, true>(name, input_file,
offset, ehdr);
+#else
+ fprintf(stderr,
+ _("%s: %s: not configured to support 64-bit big-endian object\n"),
+ program_name, name.c_str());
+ gold_exit(false);
+#endif
}
else
{
+#ifdef HAVE_TARGET_64_LITTLE
elfcpp::Ehdr<64, false> ehdr(p);
return make_elf_sized_object<64, false>(name, input_file,
offset, ehdr);
+#else
+ fprintf(stderr,
+ _("%s: %s: not configured to support 64-bit little-endian object\n"),
+ program_name, name.c_str());
+ gold_exit(false);
+#endif
}
}
}
// Instantiate the templates we need. We could use the configure
// script to restrict this to only the ones for implemented targets.
+#ifdef HAVE_TARGET_32_LITTLE
template
class Sized_relobj<32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
class Sized_relobj<32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
class Sized_relobj<64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
class Sized_relobj<64, true>;
+#endif
+#ifdef HAVE_TARGET_32_LITTLE
template
struct Relocate_info<32, false>;
+#endif
+#ifdef HAVE_TARGET_32_BIG
template
struct Relocate_info<32, true>;
+#endif
+#ifdef HAVE_TARGET_64_LITTLE
template
struct Relocate_info<64, false>;
+#endif
+#ifdef HAVE_TARGET_64_BIG
template
struct Relocate_info<64, true>;
+#endif
} // End namespace gold.
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