old-cross-binutils/gold/incremental.cc
Ian Lance Taylor 44453f85d9 * gold.cc: Include "incremental.h".
(queue_initial_tasks): Call Incremental_checker methods.
	* incremental.cc: Include "output.h".
	(Incremental_checker::can_incrementally_link_output_file): New
	method.
	* incremental.h (Incremental_checker): New class.
2009-09-01 17:32:35 +00:00

395 lines
12 KiB
C++

// inremental.cc -- incremental linking support for gold
// Copyright 2009 Free Software Foundation, Inc.
// Written by Mikolaj Zalewski <mikolajz@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 "elfcpp.h"
#include "output.h"
#include "incremental.h"
#include "archive.h"
#include "output.h"
using elfcpp::Convert;
namespace gold {
// Version information. Will change frequently during the development, later
// we could think about backward (and forward?) compatibility.
const int INCREMENTAL_LINK_VERSION = 1;
namespace internal {
// Header of the .gnu_incremental_input section.
struct Incremental_inputs_header_data
{
// Incremental linker version.
elfcpp::Elf_Word version;
// Numer of input files in the link.
elfcpp::Elf_Word input_file_count;
// Offset of command line options in .gnu_incremental_strtab.
elfcpp::Elf_Word command_line_offset;
// Padding.
elfcpp::Elf_Word reserved;
};
// Data stored in .gnu_incremental_input after the header for each of the
// Incremental_input_header_data::input_file_count input entries.
struct Incremental_inputs_entry_data
{
// Offset of file name in .gnu_incremental_strtab section.
elfcpp::Elf_Word filename_offset;
// Offset of data in .gnu_incremental_input.
elfcpp::Elf_Word data_offset;
// Timestamp (in seconds).
elfcpp::Elf_Xword timestamp_sec;
// Nano-second part of timestamp (if supported).
elfcpp::Elf_Word timestamp_nsec;
// Type of the input entry.
elfcpp::Elf_Half input_type;
// Padding.
elfcpp::Elf_Half reserved;
};
}
// Accessors.
// See internal::Incremental_input_header for fields descriptions.
template<int size, bool big_endian>
class Incremental_inputs_header_write
{
public:
Incremental_inputs_header_write(unsigned char *p)
: p_(reinterpret_cast<internal::Incremental_inputs_header_data*>(p))
{ }
static const int data_size = sizeof(internal::Incremental_inputs_header_data);
void
put_version(elfcpp::Elf_Word v)
{ this->p_->version = Convert<32, big_endian>::convert_host(v); }
void
put_input_file_count(elfcpp::Elf_Word v)
{ this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); }
void
put_command_line_offset(elfcpp::Elf_Word v)
{ this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); }
void
put_reserved(elfcpp::Elf_Word v)
{ this->p_->reserved = Convert<32, big_endian>::convert_host(v); }
private:
internal::Incremental_inputs_header_data* p_;
};
// See internal::Incremental_input_entry for fields descriptions.
template<int size, bool big_endian>
class Incremental_inputs_entry_write
{
public:
Incremental_inputs_entry_write(unsigned char *p)
: p_(reinterpret_cast<internal::Incremental_inputs_entry_data*>(p))
{ }
static const int data_size = sizeof(internal::Incremental_inputs_entry_data);
void
put_filename_offset(elfcpp::Elf_Word v)
{ this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); }
void
put_data_offset(elfcpp::Elf_Word v)
{ this->p_->data_offset = Convert<32, big_endian>::convert_host(v); }
void
put_timestamp_sec(elfcpp::Elf_Xword v)
{ this->p_->timestamp_sec = Convert<64, big_endian>::convert_host(v); }
void
put_timestamp_nsec(elfcpp::Elf_Word v)
{ this->p_->timestamp_nsec = Convert<32, big_endian>::convert_host(v); }
void
put_input_type(elfcpp::Elf_Word v)
{ this->p_->input_type = Convert<32, big_endian>::convert_host(v); }
void
put_reserved(elfcpp::Elf_Word v)
{ this->p_->reserved = Convert<32, big_endian>::convert_host(v); }
private:
internal::Incremental_inputs_entry_data* p_;
};
// Analyzes the output file to check if incremental linking is possible and
// (to be done) what files need to be relinked.
bool
Incremental_checker::can_incrementally_link_output_file()
{
Output_file output(this->output_name_);
if (!output.open_for_modification())
return false;
return true;
}
// Add the command line to the string table, setting
// command_line_key_. In incremental builds, the command line is
// stored in .gnu_incremental_inputs so that the next linker run can
// check if the command line options didn't change.
void
Incremental_inputs::report_command_line(int argc, const char* const* argv)
{
// Always store 'gold' as argv[0] to avoid a full relink if the user used a
// different path to the linker.
std::string args("gold");
// Copied from collect_argv in main.cc.
for (int i = 1; i < argc; ++i)
{
// Adding/removing these options should result in a full relink.
if (strcmp(argv[i], "--incremental-changed") == 0
|| strcmp(argv[i], "--incremental-unchanged") == 0
|| strcmp(argv[i], "--incremental-unknown") == 0)
continue;
args.append(" '");
// Now append argv[i], but with all single-quotes escaped
const char* argpos = argv[i];
while (1)
{
const int len = strcspn(argpos, "'");
args.append(argpos, len);
if (argpos[len] == '\0')
break;
args.append("'\"'\"'");
argpos += len + 1;
}
args.append("'");
}
this->strtab_->add(args.c_str(), true, &this->command_line_key_);
}
// Record that the input argument INPUT is an achive ARCHIVE. This is
// called by Read_symbols after finding out the type of the file.
void
Incremental_inputs::report_archive(const Input_argument* input,
Archive* archive)
{
Hold_lock hl(*this->lock_);
Input_info info;
info.type = INCREMENTAL_INPUT_ARCHIVE;
info.archive = archive;
info.mtime = archive->file().get_mtime();
this->inputs_map_.insert(std::make_pair(input, info));
}
// Record that the input argument INPUT is an object OBJ. This is
// called by Read_symbols after finding out the type of the file.
void
Incremental_inputs::report_object(const Input_argument* input,
Object* obj)
{
Hold_lock hl(*this->lock_);
Input_info info;
info.type = (obj->is_dynamic()
? INCREMENTAL_INPUT_SHARED_LIBRARY
: INCREMENTAL_INPUT_OBJECT);
info.object = obj;
info.mtime = obj->input_file()->file().get_mtime();
this->inputs_map_.insert(std::make_pair(input, info));
}
// Record that the input argument INPUT is an script SCRIPT. This is
// called by read_script after parsing the script and reading the list
// of inputs added by this script.
void
Incremental_inputs::report_script(const Input_argument* input,
Timespec mtime,
Script_info* script)
{
Hold_lock hl(*this->lock_);
Input_info info;
info.type = INCREMENTAL_INPUT_SCRIPT;
info.script = script;
info.mtime = mtime;
this->inputs_map_.insert(std::make_pair(input, info));
}
// Compute indexes in the order in which the inputs should appear in
// .gnu_incremental_inputs. This needs to be done after all the
// scripts are parsed. The function is first called for the command
// line inputs arguments and may call itself recursively for e.g. a
// list of elements of a group or a list of inputs added by a script.
// The [BEGIN; END) interval to analyze and *INDEX is the current
// value of the index (that will be updated).
void
Incremental_inputs::finalize_inputs(
Input_argument_list::const_iterator begin,
Input_argument_list::const_iterator end,
unsigned int* index)
{
for (Input_argument_list::const_iterator p = begin; p != end; ++p)
{
if (p->is_group())
{
finalize_inputs(p->group()->begin(), p->group()->end(), index);
continue;
}
Inputs_info_map::iterator it = this->inputs_map_.find(&(*p));
// TODO: turn it into an assert when the code will be more stable.
if (it == this->inputs_map_.end())
{
gold_error("internal error: %s: incremental build info not provided",
(p->is_file() ? p->file().name() : "[group]"));
continue;
}
Input_info* info = &it->second;
info->index = *index;
(*index)++;
this->strtab_->add(p->file().name(), false, &info->filename_key);
if (info->type == INCREMENTAL_INPUT_SCRIPT)
{
finalize_inputs(info->script->inputs()->begin(),
info->script->inputs()->end(),
index);
}
}
}
// Finalize the incremental link information. Called from
// Layout::finalize.
void
Incremental_inputs::finalize()
{
unsigned int index = 0;
finalize_inputs(this->inputs_->begin(), this->inputs_->end(), &index);
// Sanity check.
for (Inputs_info_map::const_iterator p = this->inputs_map_.begin();
p != this->inputs_map_.end();
++p)
{
gold_assert(p->second.filename_key != 0);
}
this->strtab_->set_string_offsets();
}
// Create the content of the .gnu_incremental_inputs section.
Output_section_data*
Incremental_inputs::create_incremental_inputs_section_data()
{
switch (parameters->size_and_endianness())
{
#ifdef HAVE_TARGET_32_LITTLE
case Parameters::TARGET_32_LITTLE:
return this->sized_create_inputs_section_data<32, false>();
#endif
#ifdef HAVE_TARGET_32_BIG
case Parameters::TARGET_32_BIG:
return this->sized_create_inputs_section_data<32, true>();
#endif
#ifdef HAVE_TARGET_64_LITTLE
case Parameters::TARGET_64_LITTLE:
return this->sized_create_inputs_section_data<64, false>();
#endif
#ifdef HAVE_TARGET_64_BIG
case Parameters::TARGET_64_BIG:
return this->sized_create_inputs_section_data<64, true>();
#endif
default:
gold_unreachable();
}
}
// Sized creation of .gnu_incremental_inputs section.
template<int size, bool big_endian>
Output_section_data*
Incremental_inputs::sized_create_inputs_section_data()
{
const int entry_size =
Incremental_inputs_entry_write<size, big_endian>::data_size;
const int header_size =
Incremental_inputs_header_write<size, big_endian>::data_size;
unsigned int sz = header_size + entry_size * this->inputs_map_.size();
unsigned char* buffer = new unsigned char[sz];
unsigned char* inputs_base = buffer + header_size;
Incremental_inputs_header_write<size, big_endian> header_writer(buffer);
gold_assert(this->command_line_key_ > 0);
int cmd_offset = this->strtab_->get_offset_from_key(this->command_line_key_);
header_writer.put_version(INCREMENTAL_LINK_VERSION);
header_writer.put_input_file_count(this->inputs_map_.size());
header_writer.put_command_line_offset(cmd_offset);
header_writer.put_reserved(0);
for (Inputs_info_map::const_iterator it = this->inputs_map_.begin();
it != this->inputs_map_.end();
++it)
{
gold_assert(it->second.index < this->inputs_map_.size());
unsigned char* entry_buffer =
inputs_base + it->second.index * entry_size;
Incremental_inputs_entry_write<size, big_endian> entry(entry_buffer);
int filename_offset =
this->strtab_->get_offset_from_key(it->second.filename_key);
entry.put_filename_offset(filename_offset);
// TODO: add per input data and timestamp. Currently we store
// an out-of-bounds offset for future version of gold to reject
// such an incremental_inputs section.
entry.put_data_offset(0xffffffff);
entry.put_timestamp_sec(it->second.mtime.seconds);
entry.put_timestamp_nsec(it->second.mtime.nanoseconds);
entry.put_input_type(it->second.type);
entry.put_reserved(0);
}
return new Output_data_const_buffer(buffer, sz, 8,
"** incremental link inputs list");
}
} // End namespace gold.