binutils-gdb/gold/merge.cc

759 lines
21 KiB
C++
Raw Normal View History

2007-05-16 19:42:48 +02:00
// merge.cc -- handle section merging for gold
PR gold/12571 * options.h (class General_options): Add --ld-generated-unwind-info. * ehframe.cc (Fde::write): Add address parameter. Change all callers. If associated with PLT, fill in address and size. (Cie::set_output_offset): Only add merge mapping if there is an object. (Cie::write): Add address parameter. Change all callers. (Eh_frame::add_ehframe_for_plt): New function. * ehframe.h (class Fde): Update declarations. Move shndx_ and input_offset_ fields into union u_, with new plt field. (Fde::Fde): Adjust for new union field. (Fde::Fde) [Output_data version]: New constructor. (Fde::add_mapping): Only add merge mapping if there is an object. (class Cie): Update declarations. (class Eh_frame): Declare add_ehframe_for_plt. * layout.cc (Layout::layout_eh_frame): Break out code into make_eh_frame_section, and call it. (Layout::make_eh_frame_section): New function. (Layout::add_eh_frame_for_plt): New function. * layout.h (class Layout): Update declarations. * merge.cc (Merge_map::add_mapping): Add assertion. * i386.cc: Include "dwarf.h". (class Output_data_plt_i386): Make first_plt_entry, dyn_first_plt_entry, exec_plt_entry, and dyn_plt_entry const. Add plt_eh_frame_cie_size, plt_eh_frame_fde_size, plt_eh_frame_cie, and plt_eh_frame_fde. (Output_data_plt_i386::Output_data_plt_i386): Align to 16-byte boundary. Call add_eh_frame_for_plt if appropriate. * x86_64.cc: Include "dwarf.h". (class Output_data_plt_x86_64): Align to 16-byte boundary. Make first_plt_entry, plt_entry and tlsdesc_plt_entry const. Add plt_eh_frame_cie_size, plt_eh_frame_fde_size, plt_eh_frame_cie, and plt_eh_frame_fde. (Output_data_plt_x86_64::init): Call add_eh_frame_for_plt if appropriate.
2011-07-02 00:05:01 +02:00
// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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.
2007-05-16 19:42:48 +02:00
#include "gold.h"
#include <cstdlib>
#include <algorithm>
2007-05-16 19:42:48 +02:00
#include "merge.h"
#include "compressed_output.h"
2007-05-16 19:42:48 +02:00
namespace gold
{
// Class Object_merge_map.
2007-11-27 07:13:33 +01:00
// Destructor.
Object_merge_map::~Object_merge_map()
2007-05-16 19:42:48 +02:00
{
2007-11-27 07:13:33 +01:00
for (Section_merge_maps::iterator p = this->section_merge_maps_.begin();
p != this->section_merge_maps_.end();
++p)
delete p->second;
}
// Get the Input_merge_map to use for an input section, or NULL.
Object_merge_map::Input_merge_map*
Object_merge_map::get_input_merge_map(unsigned int shndx)
{
gold_assert(shndx != -1U);
if (shndx == this->first_shnum_)
return &this->first_map_;
if (shndx == this->second_shnum_)
return &this->second_map_;
Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
if (p != this->section_merge_maps_.end())
return p->second;
return NULL;
}
// Get or create the Input_merge_map to use for an input section.
Object_merge_map::Input_merge_map*
Object_merge_map::get_or_make_input_merge_map(const Merge_map* merge_map,
unsigned int shndx)
{
Input_merge_map* map = this->get_input_merge_map(shndx);
if (map != NULL)
{
// For a given input section in a given object, every mapping
// must be done with the same Merge_map.
2007-11-27 07:13:33 +01:00
gold_assert(map->merge_map == merge_map);
return map;
}
// We need to create a new entry.
if (this->first_shnum_ == -1U)
{
2007-11-27 07:13:33 +01:00
this->first_shnum_ = shndx;
this->first_map_.merge_map = merge_map;
return &this->first_map_;
}
2007-11-27 07:13:33 +01:00
if (this->second_shnum_ == -1U)
{
this->second_shnum_ = shndx;
this->second_map_.merge_map = merge_map;
return &this->second_map_;
}
Input_merge_map* new_map = new Input_merge_map;
new_map->merge_map = merge_map;
this->section_merge_maps_[shndx] = new_map;
return new_map;
}
// Add a mapping.
void
Object_merge_map::add_mapping(const Merge_map* merge_map, unsigned int shndx,
section_offset_type input_offset,
section_size_type length,
section_offset_type output_offset)
2007-11-27 07:13:33 +01:00
{
Input_merge_map* map = this->get_or_make_input_merge_map(merge_map, shndx);
// Try to merge the new entry in the last one we saw.
if (!map->entries.empty())
{
Input_merge_entry& entry(map->entries.back());
// Use section_size_type to avoid signed/unsigned warnings.
section_size_type input_offset_u = input_offset;
section_size_type output_offset_u = output_offset;
2007-11-27 07:13:33 +01:00
// If this entry is not in order, we need to sort the vector
// before looking anything up.
if (input_offset_u < entry.input_offset + entry.length)
2007-11-27 07:13:33 +01:00
{
gold_assert(input_offset < entry.input_offset);
gold_assert(input_offset_u + length
<= static_cast<section_size_type>(entry.input_offset));
2007-11-27 07:13:33 +01:00
map->sorted = false;
}
else if (entry.input_offset + entry.length == input_offset_u
2007-11-27 07:13:33 +01:00
&& (output_offset == -1
? entry.output_offset == -1
: entry.output_offset + entry.length == output_offset_u))
2007-11-27 07:13:33 +01:00
{
entry.length += length;
return;
}
}
Input_merge_entry entry;
entry.input_offset = input_offset;
entry.length = length;
entry.output_offset = output_offset;
map->entries.push_back(entry);
}
// Get the output offset for an input address.
bool
2007-11-27 07:13:33 +01:00
Object_merge_map::get_output_offset(const Merge_map* merge_map,
unsigned int shndx,
section_offset_type input_offset,
section_offset_type* output_offset)
2007-11-27 07:13:33 +01:00
{
Input_merge_map* map = this->get_input_merge_map(shndx);
if (map == NULL
|| (merge_map != NULL && map->merge_map != merge_map))
2007-11-27 07:13:33 +01:00
return false;
if (!map->sorted)
{
std::sort(map->entries.begin(), map->entries.end(),
Input_merge_compare());
map->sorted = true;
}
Input_merge_entry entry;
entry.input_offset = input_offset;
std::vector<Input_merge_entry>::const_iterator p =
std::lower_bound(map->entries.begin(), map->entries.end(),
entry, Input_merge_compare());
if (p == map->entries.end() || p->input_offset > input_offset)
{
if (p == map->entries.begin())
return false;
--p;
gold_assert(p->input_offset <= input_offset);
}
if (input_offset - p->input_offset
>= static_cast<section_offset_type>(p->length))
2007-11-27 07:13:33 +01:00
return false;
*output_offset = p->output_offset;
if (*output_offset != -1)
*output_offset += (input_offset - p->input_offset);
return true;
2007-05-16 19:42:48 +02:00
}
// Return whether this is the merge map for section SHNDX.
inline bool
Object_merge_map::is_merge_section_for(const Merge_map* merge_map,
unsigned int shndx)
{
Input_merge_map* map = this->get_input_merge_map(shndx);
return map != NULL && map->merge_map == merge_map;
}
// Initialize a mapping from input offsets to output addresses.
template<int size>
void
Object_merge_map::initialize_input_to_output_map(
unsigned int shndx,
typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
Unordered_map<section_offset_type,
typename elfcpp::Elf_types<size>::Elf_Addr>* initialize_map)
{
Input_merge_map* map = this->get_input_merge_map(shndx);
gold_assert(map != NULL);
gold_assert(initialize_map->empty());
// We know how many entries we are going to add.
// reserve_unordered_map takes an expected count of buckets, not a
// count of elements, so double it to try to reduce collisions.
reserve_unordered_map(initialize_map, map->entries.size() * 2);
for (Input_merge_map::Entries::const_iterator p = map->entries.begin();
p != map->entries.end();
++p)
{
section_offset_type output_offset = p->output_offset;
if (output_offset != -1)
output_offset += starting_address;
else
{
// If we see a relocation against an address we have chosen
// to discard, we relocate to zero. FIXME: We could also
// issue a warning in this case; that would require
// reporting this somehow and checking it in the routines in
// reloc.h.
output_offset = 0;
}
initialize_map->insert(std::make_pair(p->input_offset, output_offset));
}
}
// Class Merge_map.
// Add a mapping for the bytes from OFFSET to OFFSET + LENGTH in input
// section SHNDX in object OBJECT to an OUTPUT_OFFSET in merged data
// in an output section.
2007-05-16 19:42:48 +02:00
void
Merge_map::add_mapping(Relobj* object, unsigned int shndx,
section_offset_type offset, section_size_type length,
section_offset_type output_offset)
2007-05-16 19:42:48 +02:00
{
PR gold/12571 * options.h (class General_options): Add --ld-generated-unwind-info. * ehframe.cc (Fde::write): Add address parameter. Change all callers. If associated with PLT, fill in address and size. (Cie::set_output_offset): Only add merge mapping if there is an object. (Cie::write): Add address parameter. Change all callers. (Eh_frame::add_ehframe_for_plt): New function. * ehframe.h (class Fde): Update declarations. Move shndx_ and input_offset_ fields into union u_, with new plt field. (Fde::Fde): Adjust for new union field. (Fde::Fde) [Output_data version]: New constructor. (Fde::add_mapping): Only add merge mapping if there is an object. (class Cie): Update declarations. (class Eh_frame): Declare add_ehframe_for_plt. * layout.cc (Layout::layout_eh_frame): Break out code into make_eh_frame_section, and call it. (Layout::make_eh_frame_section): New function. (Layout::add_eh_frame_for_plt): New function. * layout.h (class Layout): Update declarations. * merge.cc (Merge_map::add_mapping): Add assertion. * i386.cc: Include "dwarf.h". (class Output_data_plt_i386): Make first_plt_entry, dyn_first_plt_entry, exec_plt_entry, and dyn_plt_entry const. Add plt_eh_frame_cie_size, plt_eh_frame_fde_size, plt_eh_frame_cie, and plt_eh_frame_fde. (Output_data_plt_i386::Output_data_plt_i386): Align to 16-byte boundary. Call add_eh_frame_for_plt if appropriate. * x86_64.cc: Include "dwarf.h". (class Output_data_plt_x86_64): Align to 16-byte boundary. Make first_plt_entry, plt_entry and tlsdesc_plt_entry const. Add plt_eh_frame_cie_size, plt_eh_frame_fde_size, plt_eh_frame_cie, and plt_eh_frame_fde. (Output_data_plt_x86_64::init): Call add_eh_frame_for_plt if appropriate.
2011-07-02 00:05:01 +02:00
gold_assert(object != NULL);
2007-11-27 07:13:33 +01:00
Object_merge_map* object_merge_map = object->merge_map();
if (object_merge_map == NULL)
{
object_merge_map = new Object_merge_map();
object->set_merge_map(object_merge_map);
}
object_merge_map->add_mapping(this, shndx, offset, length, output_offset);
2007-05-16 19:42:48 +02:00
}
// Return the output offset for an input address. The input address
// is at offset OFFSET in section SHNDX in OBJECT. This sets
// *OUTPUT_OFFSET to the offset in the merged data in the output
// section. This returns true if the mapping is known, false
// otherwise.
2007-05-16 19:42:48 +02:00
2007-12-20 02:32:10 +01:00
bool
Merge_map::get_output_offset(const Relobj* object, unsigned int shndx,
section_offset_type offset,
section_offset_type* output_offset) const
2007-05-16 19:42:48 +02:00
{
2007-11-27 07:13:33 +01:00
Object_merge_map* object_merge_map = object->merge_map();
if (object_merge_map == NULL)
2007-05-16 19:42:48 +02:00
return false;
2007-11-27 07:13:33 +01:00
return object_merge_map->get_output_offset(this, shndx, offset,
output_offset);
2007-05-16 19:42:48 +02:00
}
// Return whether this is the merge section for SHNDX in OBJECT.
bool
Merge_map::is_merge_section_for(const Relobj* object, unsigned int shndx) const
{
Object_merge_map* object_merge_map = object->merge_map();
if (object_merge_map == NULL)
return false;
return object_merge_map->is_merge_section_for(this, shndx);
}
// Class Output_merge_base.
// Return the output offset for an input offset. The input address is
// at offset OFFSET in section SHNDX in OBJECT. If we know the
// offset, set *POUTPUT and return true. Otherwise return false.
bool
Output_merge_base::do_output_offset(const Relobj* object,
unsigned int shndx,
section_offset_type offset,
section_offset_type* poutput) const
{
return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
}
// Return whether this is the merge section for SHNDX in OBJECT.
bool
Output_merge_base::do_is_merge_section_for(const Relobj* object,
unsigned int shndx) const
{
return this->merge_map_.is_merge_section_for(object, shndx);
}
2010-05-23 Doug Kwan <dougkwan@google.com> * arm.cc (Arm_input_section::do_output_offset): Use convert_types instead of a cast. (Target_arm::apply_cortex_a8_workaround): Rewrite a conditional branch with a direct branch, not a conditional branch, to a stub. * merge.cc (Output_merge_base::record_input_section): New method defintion. (Output_merge_data::do_add_input_section): Record input section if keeps-input-sections flag is set. (Output_merge_string::do_add_input_section): Ditto. * merge.h (Output_merge_base::Output_merge_base): Initialize new data members KEEPS_INPUT_SECTIONS_, FIRST_RELOBJ_, FIRST_SHNDX_ and INPUT_SECTIONS_. (Output_merge_base::keeps_input_sections, Output_merge_base::set_keeps_input_sections, Output_merge_base::first_relobj, Output_merge_base::first_shndx): New method definitions. (Output_merge_base::Input_sections): New type declaration. (Output_merge_base::input_sections_begin, Output_merge_base::input_sections_end, Output_merge_base::do_set_keeps_input_sections): New method definitions. (Output_merge_base::bool keeps_input_sections_, Output_merge_base::first_relobj_, Output_merge_base::first_shndx_, Output_merge_base::input_sections_): New data members. (Output_merge_data::do_set_keeps_input_sections): New method defintion. (Output_merge_string::do_set_keeps_input_sections): Ditto. * output.cc (Output_section::Input_section::relobj): Move method defintion from class declaration to here and handle merge sections. (Output_section::Input_section::shndx): Ditto. (Output_section::Output_section): Remove initializations of removed data members and initialize new data member LOOKUP_MAPS_. (Output_section::add_input_section): Set keeps-input-sections flag for a newly created merge output section as appropriate. Adjust code to use Output_section_lookup_maps class. (Output_section::add_relaxed_input_section): Adjst code for lookup maps code refactoring. (Output_section::add_merge_input_section): Add a new parameter KEEPS_INPUT_SECTION. Adjust code to use Output_section_lookup_maps class. If adding input section to a newly created merge output section fails, remove the new merge section. (Output_section::convert_input_sections_in_list_to_relaxed_input_sections): Adjust code for use of the Output_section_lookup_maps class. (Output_section::find_merge_section): Ditto. (Output_section::build_lookup_maps): New method defintion. (Output_section::find_relaxed_input_section): Adjust code to use Output_section_lookup_maps class. (Output_section::get_input_sections): Export merge sections. Adjust code to use Output_section_lookup_maps class. (Output_section:::add_script_input_section): Adjust code to use Output_section_lookup_maps class. Update lookup maps for merge sections also. (Output_section::discard_states): Use Output_section_lookup_maps. (Output_section::restore_states): Same. * output.h (Merge_section_properties): Move class defintion out of Output_section. (Output_section_lookup_maps): New class. (Output_section::Input_section::is_merge_section): New method defintion. (Output_section::Input_section::relobj): Move defintion out of class defintion. Declare method only. (Output_section::Input_section::shndx): Ditto. (Output_section::Input_section::output_merge_base): New method defintion. (Output_section::Input_section::u2_.pomb): New union field. (Output_section::Merge_section_by_properties_map, Output_section::Output_section_data_by_input_section_map, Output_section::Ouptut_relaxed_input_section_by_input_section_map): Remove types. (Output_section::add_merge_input_section): Add new parameter KEEPS_INPUT_SECTIONS. (Output_section::build_lookup_maps): New method declaration. (Output_section::merge_section_map_, Output_section::merge_section_by_properties_map_, Output_section::relaxed_input_section_map_, Output_section::is_relaxed_input_section_map_valid_): Remove data members. (Output_section::lookup_maps_): New data member.
2010-05-23 09:43:39 +02:00
// Record a merged input section for script processing.
void
Output_merge_base::record_input_section(Relobj* relobj, unsigned int shndx)
{
gold_assert(this->keeps_input_sections_ && relobj != NULL);
// If this is the first input section, record it. We need do this because
// this->input_sections_ is unordered.
if (this->first_relobj_ == NULL)
{
this->first_relobj_ = relobj;
this->first_shndx_ = shndx;
}
std::pair<Input_sections::iterator, bool> result =
this->input_sections_.insert(Section_id(relobj, shndx));
// We should insert a merge section once only.
gold_assert(result.second);
}
// Class Output_merge_data.
2007-05-16 19:42:48 +02:00
// Compute the hash code for a fixed-size constant.
size_t
Output_merge_data::Merge_data_hash::operator()(Merge_data_key k) const
{
const unsigned char* p = this->pomd_->constant(k);
section_size_type entsize =
convert_to_section_size_type(this->pomd_->entsize());
2007-05-16 19:42:48 +02:00
// Fowler/Noll/Vo (FNV) hash (type FNV-1a).
if (sizeof(size_t) == 8)
{
size_t result = static_cast<size_t>(14695981039346656037ULL);
for (section_size_type i = 0; i < entsize; ++i)
2007-05-16 19:42:48 +02:00
{
result &= (size_t) *p++;
result *= 1099511628211ULL;
}
return result;
}
else
{
size_t result = 2166136261UL;
for (section_size_type i = 0; i < entsize; ++i)
2007-05-16 19:42:48 +02:00
{
result ^= (size_t) *p++;
result *= 16777619UL;
}
return result;
}
}
// Return whether one hash table key equals another.
bool
Output_merge_data::Merge_data_eq::operator()(Merge_data_key k1,
Merge_data_key k2) const
{
const unsigned char* p1 = this->pomd_->constant(k1);
const unsigned char* p2 = this->pomd_->constant(k2);
return memcmp(p1, p2, this->pomd_->entsize()) == 0;
}
// Add a constant to the end of the section contents.
void
Output_merge_data::add_constant(const unsigned char* p)
{
section_size_type entsize = convert_to_section_size_type(this->entsize());
section_size_type addralign =
convert_to_section_size_type(this->addralign());
section_size_type addsize = std::max(entsize, addralign);
if (this->len_ + addsize > this->alc_)
2007-05-16 19:42:48 +02:00
{
if (this->alc_ == 0)
this->alc_ = 128 * addsize;
2007-05-16 19:42:48 +02:00
else
this->alc_ *= 2;
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->alc_));
if (this->p_ == NULL)
gold_nomem();
2007-05-16 19:42:48 +02:00
}
memcpy(this->p_ + this->len_, p, entsize);
if (addsize > entsize)
memset(this->p_ + this->len_ + entsize, 0, addsize - entsize);
this->len_ += addsize;
2007-05-16 19:42:48 +02:00
}
// Add the input section SHNDX in OBJECT to a merged output section
// which holds fixed length constants. Return whether we were able to
// handle the section; if not, it will be linked as usual without
// constant merging.
bool
Output_merge_data::do_add_input_section(Relobj* object, unsigned int shndx)
{
section_size_type len;
section_size_type uncompressed_size = 0;
unsigned char* uncompressed_data = NULL;
const unsigned char* p = object->section_contents(shndx, &len, false);
2007-05-16 19:42:48 +02:00
if (object->section_is_compressed(shndx, &uncompressed_size))
{
uncompressed_data = new unsigned char[uncompressed_size];
if (!decompress_input_section(p, len, uncompressed_data,
uncompressed_size))
object->error(_("could not decompress section %s"),
object->section_name(shndx).c_str());
p = uncompressed_data;
len = uncompressed_size;
}
section_size_type entsize = convert_to_section_size_type(this->entsize());
2007-05-16 19:42:48 +02:00
if (len % entsize != 0)
{
if (uncompressed_data != NULL)
delete[] uncompressed_data;
return false;
}
2007-05-16 19:42:48 +02:00
this->input_count_ += len / entsize;
for (section_size_type i = 0; i < len; i += entsize, p += entsize)
2007-05-16 19:42:48 +02:00
{
// Add the constant to the section contents. If we find that it
// is already in the hash table, we will remove it again.
Merge_data_key k = this->len_;
this->add_constant(p);
std::pair<Merge_data_hashtable::iterator, bool> ins =
this->hashtable_.insert(k);
if (!ins.second)
{
// Key was already present. Remove the copy we just added.
this->len_ -= entsize;
2007-05-16 19:42:48 +02:00
k = *ins.first;
}
// Record the offset of this constant in the output section.
this->add_mapping(object, shndx, i, entsize, k);
2007-05-16 19:42:48 +02:00
}
2010-05-23 Doug Kwan <dougkwan@google.com> * arm.cc (Arm_input_section::do_output_offset): Use convert_types instead of a cast. (Target_arm::apply_cortex_a8_workaround): Rewrite a conditional branch with a direct branch, not a conditional branch, to a stub. * merge.cc (Output_merge_base::record_input_section): New method defintion. (Output_merge_data::do_add_input_section): Record input section if keeps-input-sections flag is set. (Output_merge_string::do_add_input_section): Ditto. * merge.h (Output_merge_base::Output_merge_base): Initialize new data members KEEPS_INPUT_SECTIONS_, FIRST_RELOBJ_, FIRST_SHNDX_ and INPUT_SECTIONS_. (Output_merge_base::keeps_input_sections, Output_merge_base::set_keeps_input_sections, Output_merge_base::first_relobj, Output_merge_base::first_shndx): New method definitions. (Output_merge_base::Input_sections): New type declaration. (Output_merge_base::input_sections_begin, Output_merge_base::input_sections_end, Output_merge_base::do_set_keeps_input_sections): New method definitions. (Output_merge_base::bool keeps_input_sections_, Output_merge_base::first_relobj_, Output_merge_base::first_shndx_, Output_merge_base::input_sections_): New data members. (Output_merge_data::do_set_keeps_input_sections): New method defintion. (Output_merge_string::do_set_keeps_input_sections): Ditto. * output.cc (Output_section::Input_section::relobj): Move method defintion from class declaration to here and handle merge sections. (Output_section::Input_section::shndx): Ditto. (Output_section::Output_section): Remove initializations of removed data members and initialize new data member LOOKUP_MAPS_. (Output_section::add_input_section): Set keeps-input-sections flag for a newly created merge output section as appropriate. Adjust code to use Output_section_lookup_maps class. (Output_section::add_relaxed_input_section): Adjst code for lookup maps code refactoring. (Output_section::add_merge_input_section): Add a new parameter KEEPS_INPUT_SECTION. Adjust code to use Output_section_lookup_maps class. If adding input section to a newly created merge output section fails, remove the new merge section. (Output_section::convert_input_sections_in_list_to_relaxed_input_sections): Adjust code for use of the Output_section_lookup_maps class. (Output_section::find_merge_section): Ditto. (Output_section::build_lookup_maps): New method defintion. (Output_section::find_relaxed_input_section): Adjust code to use Output_section_lookup_maps class. (Output_section::get_input_sections): Export merge sections. Adjust code to use Output_section_lookup_maps class. (Output_section:::add_script_input_section): Adjust code to use Output_section_lookup_maps class. Update lookup maps for merge sections also. (Output_section::discard_states): Use Output_section_lookup_maps. (Output_section::restore_states): Same. * output.h (Merge_section_properties): Move class defintion out of Output_section. (Output_section_lookup_maps): New class. (Output_section::Input_section::is_merge_section): New method defintion. (Output_section::Input_section::relobj): Move defintion out of class defintion. Declare method only. (Output_section::Input_section::shndx): Ditto. (Output_section::Input_section::output_merge_base): New method defintion. (Output_section::Input_section::u2_.pomb): New union field. (Output_section::Merge_section_by_properties_map, Output_section::Output_section_data_by_input_section_map, Output_section::Ouptut_relaxed_input_section_by_input_section_map): Remove types. (Output_section::add_merge_input_section): Add new parameter KEEPS_INPUT_SECTIONS. (Output_section::build_lookup_maps): New method declaration. (Output_section::merge_section_map_, Output_section::merge_section_by_properties_map_, Output_section::relaxed_input_section_map_, Output_section::is_relaxed_input_section_map_valid_): Remove data members. (Output_section::lookup_maps_): New data member.
2010-05-23 09:43:39 +02:00
// For script processing, we keep the input sections.
if (this->keeps_input_sections())
record_input_section(object, shndx);
if (uncompressed_data != NULL)
delete[] uncompressed_data;
2007-05-16 19:42:48 +02:00
return true;
}
// Set the final data size in a merged output section with fixed size
// constants.
void
Output_merge_data::set_final_data_size()
2007-05-16 19:42:48 +02:00
{
// Release the memory we don't need.
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->len_));
// An Output_merge_data object may be empty and realloc is allowed
// to return a NULL pointer in this case. An Output_merge_data is empty
// if all its input sections have sizes that are not multiples of entsize.
gold_assert(this->p_ != NULL || this->len_ == 0);
2007-05-16 19:42:48 +02:00
this->set_data_size(this->len_);
}
// Write the data of a merged output section with fixed size constants
// to the file.
void
Output_merge_data::do_write(Output_file* of)
{
of->write(this->offset(), this->p_, this->len_);
}
2007-12-01 07:34:12 +01:00
// Write the data to a buffer.
void
Output_merge_data::do_write_to_buffer(unsigned char* buffer)
{
memcpy(buffer, this->p_, this->len_);
}
// Print merge stats to stderr.
void
Output_merge_data::do_print_merge_stats(const char* section_name)
{
fprintf(stderr,
_("%s: %s merged constants size: %lu; input: %zu; output: %zu\n"),
program_name, section_name,
static_cast<unsigned long>(this->entsize()),
this->input_count_, this->hashtable_.size());
}
// Class Output_merge_string.
2007-05-16 19:42:48 +02:00
// Add an input section to a merged string section.
template<typename Char_type>
bool
Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
unsigned int shndx)
{
section_size_type len;
section_size_type uncompressed_size = 0;
unsigned char* uncompressed_data = NULL;
const unsigned char* pdata = object->section_contents(shndx, &len, false);
2007-05-16 19:42:48 +02:00
if (object->section_is_compressed(shndx, &uncompressed_size))
{
uncompressed_data = new unsigned char[uncompressed_size];
if (!decompress_input_section(pdata, len, uncompressed_data,
uncompressed_size))
object->error(_("could not decompress section %s"),
object->section_name(shndx).c_str());
pdata = uncompressed_data;
len = uncompressed_size;
}
2007-05-16 19:42:48 +02:00
const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
const Char_type* pend = p + len / sizeof(Char_type);
const Char_type* pend0 = pend;
2007-05-16 19:42:48 +02:00
if (len % sizeof(Char_type) != 0)
{
object->error(_("mergeable string section length not multiple of "
"character size"));
if (uncompressed_data != NULL)
delete[] uncompressed_data;
return false;
2007-05-16 19:42:48 +02:00
}
if (pend[-1] != 0)
{
gold_warning(_("%s: last entry in mergeable string section '%s' "
"not null terminated"),
object->name().c_str(),
object->section_name(shndx).c_str());
// Find the end of the last NULL-terminated string in the buffer.
while (pend0 > p && pend0[-1] != 0)
--pend0;
}
Merged_strings_list* merged_strings_list =
new Merged_strings_list(object, shndx);
this->merged_strings_lists_.push_back(merged_strings_list);
Merged_strings& merged_strings = merged_strings_list->merged_strings;
// Count the number of strings in the section and size the list.
size_t count = 0;
for (const Char_type* pt = p; pt < pend0; pt += string_length(pt) + 1)
++count;
if (pend0 < pend)
++count;
merged_strings.reserve(count + 1);
// The index I is in bytes, not characters.
section_size_type i = 0;
while (p < pend0)
2007-05-16 19:42:48 +02:00
{
size_t len = string_length(p);
Stringpool::Key key;
this->stringpool_.add_with_length(p, len, true, &key);
merged_strings.push_back(Merged_string(i, key));
p += len + 1;
i += (len + 1) * sizeof(Char_type);
}
if (p < pend)
{
size_t len = pend - p;
2007-05-16 19:42:48 +02:00
Stringpool::Key key;
this->stringpool_.add_with_length(p, len, true, &key);
2007-05-16 19:42:48 +02:00
merged_strings.push_back(Merged_string(i, key));
2007-05-16 19:42:48 +02:00
i += (len + 1) * sizeof(Char_type);
2007-05-16 19:42:48 +02:00
}
// Record the last offset in the input section so that we can
// compute the length of the last string.
merged_strings.push_back(Merged_string(i, 0));
this->input_count_ += count;
this->input_size_ += len;
2010-05-23 Doug Kwan <dougkwan@google.com> * arm.cc (Arm_input_section::do_output_offset): Use convert_types instead of a cast. (Target_arm::apply_cortex_a8_workaround): Rewrite a conditional branch with a direct branch, not a conditional branch, to a stub. * merge.cc (Output_merge_base::record_input_section): New method defintion. (Output_merge_data::do_add_input_section): Record input section if keeps-input-sections flag is set. (Output_merge_string::do_add_input_section): Ditto. * merge.h (Output_merge_base::Output_merge_base): Initialize new data members KEEPS_INPUT_SECTIONS_, FIRST_RELOBJ_, FIRST_SHNDX_ and INPUT_SECTIONS_. (Output_merge_base::keeps_input_sections, Output_merge_base::set_keeps_input_sections, Output_merge_base::first_relobj, Output_merge_base::first_shndx): New method definitions. (Output_merge_base::Input_sections): New type declaration. (Output_merge_base::input_sections_begin, Output_merge_base::input_sections_end, Output_merge_base::do_set_keeps_input_sections): New method definitions. (Output_merge_base::bool keeps_input_sections_, Output_merge_base::first_relobj_, Output_merge_base::first_shndx_, Output_merge_base::input_sections_): New data members. (Output_merge_data::do_set_keeps_input_sections): New method defintion. (Output_merge_string::do_set_keeps_input_sections): Ditto. * output.cc (Output_section::Input_section::relobj): Move method defintion from class declaration to here and handle merge sections. (Output_section::Input_section::shndx): Ditto. (Output_section::Output_section): Remove initializations of removed data members and initialize new data member LOOKUP_MAPS_. (Output_section::add_input_section): Set keeps-input-sections flag for a newly created merge output section as appropriate. Adjust code to use Output_section_lookup_maps class. (Output_section::add_relaxed_input_section): Adjst code for lookup maps code refactoring. (Output_section::add_merge_input_section): Add a new parameter KEEPS_INPUT_SECTION. Adjust code to use Output_section_lookup_maps class. If adding input section to a newly created merge output section fails, remove the new merge section. (Output_section::convert_input_sections_in_list_to_relaxed_input_sections): Adjust code for use of the Output_section_lookup_maps class. (Output_section::find_merge_section): Ditto. (Output_section::build_lookup_maps): New method defintion. (Output_section::find_relaxed_input_section): Adjust code to use Output_section_lookup_maps class. (Output_section::get_input_sections): Export merge sections. Adjust code to use Output_section_lookup_maps class. (Output_section:::add_script_input_section): Adjust code to use Output_section_lookup_maps class. Update lookup maps for merge sections also. (Output_section::discard_states): Use Output_section_lookup_maps. (Output_section::restore_states): Same. * output.h (Merge_section_properties): Move class defintion out of Output_section. (Output_section_lookup_maps): New class. (Output_section::Input_section::is_merge_section): New method defintion. (Output_section::Input_section::relobj): Move defintion out of class defintion. Declare method only. (Output_section::Input_section::shndx): Ditto. (Output_section::Input_section::output_merge_base): New method defintion. (Output_section::Input_section::u2_.pomb): New union field. (Output_section::Merge_section_by_properties_map, Output_section::Output_section_data_by_input_section_map, Output_section::Ouptut_relaxed_input_section_by_input_section_map): Remove types. (Output_section::add_merge_input_section): Add new parameter KEEPS_INPUT_SECTIONS. (Output_section::build_lookup_maps): New method declaration. (Output_section::merge_section_map_, Output_section::merge_section_by_properties_map_, Output_section::relaxed_input_section_map_, Output_section::is_relaxed_input_section_map_valid_): Remove data members. (Output_section::lookup_maps_): New data member.
2010-05-23 09:43:39 +02:00
// For script processing, we keep the input sections.
if (this->keeps_input_sections())
record_input_section(object, shndx);
if (uncompressed_data != NULL)
delete[] uncompressed_data;
2007-05-16 19:42:48 +02:00
return true;
}
// Finalize the mappings from the input sections to the output
// section, and return the final data size.
2007-05-16 19:42:48 +02:00
template<typename Char_type>
section_size_type
Output_merge_string<Char_type>::finalize_merged_data()
2007-05-16 19:42:48 +02:00
{
this->stringpool_.set_string_offsets();
for (typename Merged_strings_lists::const_iterator l =
this->merged_strings_lists_.begin();
l != this->merged_strings_lists_.end();
++l)
{
section_offset_type last_input_offset = 0;
section_offset_type last_output_offset = 0;
for (typename Merged_strings::const_iterator p =
(*l)->merged_strings.begin();
p != (*l)->merged_strings.end();
++p)
{
section_size_type length = p->offset - last_input_offset;
if (length > 0)
this->add_mapping((*l)->object, (*l)->shndx, last_input_offset,
length, last_output_offset);
last_input_offset = p->offset;
if (p->stringpool_key != 0)
last_output_offset =
this->stringpool_.get_offset_from_key(p->stringpool_key);
}
delete *l;
}
2007-05-16 19:42:48 +02:00
// Save some memory. This also ensures that this function will work
// if called twice, as may happen if Layout::set_segment_offsets
// finds a better alignment.
this->merged_strings_lists_.clear();
return this->stringpool_.get_strtab_size();
}
template<typename Char_type>
void
Output_merge_string<Char_type>::set_final_data_size()
{
const off_t final_data_size = this->finalize_merged_data();
this->set_data_size(final_data_size);
2007-05-16 19:42:48 +02:00
}
// Write out a merged string section.
template<typename Char_type>
void
Output_merge_string<Char_type>::do_write(Output_file* of)
{
this->stringpool_.write(of, this->offset());
}
2007-12-01 07:34:12 +01:00
// Write a merged string section to a buffer.
template<typename Char_type>
void
Output_merge_string<Char_type>::do_write_to_buffer(unsigned char* buffer)
{
this->stringpool_.write_to_buffer(buffer, this->data_size());
}
// Return the name of the types of string to use with
// do_print_merge_stats.
template<typename Char_type>
const char*
Output_merge_string<Char_type>::string_name()
{
gold_unreachable();
return NULL;
}
template<>
const char*
Output_merge_string<char>::string_name()
{
return "strings";
}
template<>
const char*
Output_merge_string<uint16_t>::string_name()
{
return "16-bit strings";
}
template<>
const char*
Output_merge_string<uint32_t>::string_name()
{
return "32-bit strings";
}
// Print merge stats to stderr.
template<typename Char_type>
void
Output_merge_string<Char_type>::do_print_merge_stats(const char* section_name)
{
char buf[200];
snprintf(buf, sizeof buf, "%s merged %s", section_name, this->string_name());
fprintf(stderr, _("%s: %s input bytes: %zu\n"),
program_name, buf, this->input_size_);
fprintf(stderr, _("%s: %s input strings: %zu\n"),
program_name, buf, this->input_count_);
this->stringpool_.print_stats(buf);
}
2007-05-16 19:42:48 +02:00
// Instantiate the templates we need.
template
class Output_merge_string<char>;
template
class Output_merge_string<uint16_t>;
template
class Output_merge_string<uint32_t>;
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
template
void
Object_merge_map::initialize_input_to_output_map<32>(
unsigned int shndx,
elfcpp::Elf_types<32>::Elf_Addr starting_address,
Unordered_map<section_offset_type, elfcpp::Elf_types<32>::Elf_Addr>*);
#endif
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
template
void
Object_merge_map::initialize_input_to_output_map<64>(
unsigned int shndx,
elfcpp::Elf_types<64>::Elf_Addr starting_address,
Unordered_map<section_offset_type, elfcpp::Elf_types<64>::Elf_Addr>*);
#endif
2007-05-16 19:42:48 +02:00
} // End namespace gold.