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binutils-gdb/gold/options.cc

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// options.c -- handle command line options for 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 <iostream>
#include <sys/stat.h>
#include "filenames.h"
#include "libiberty.h"
#include "options.h"
namespace gold
{
// The information we keep for a single command line option.
struct options::One_option
{
// The single character option name, or '\0' if this is only a long
// option.
char short_option;
// The long option name, or NULL if this is only a short option.
const char* long_option;
// Description of the option for --help output, or NULL if there is none.
const char* doc;
// How to print the option name in --help output, or NULL to use the
// default.
const char* help_output;
// Long option dash control. This is ignored if long_option is
// NULL.
enum
{
// Long option normally takes one dash; two dashes are also
// accepted.
ONE_DASH,
// Long option normally takes two dashes; one dash is also
// accepted.
TWO_DASHES,
// Long option always takes two dashes.
EXACTLY_TWO_DASHES
} dash;
// Function for special handling, or NULL. Returns the number of
// arguments to skip. This will normally be at least 1, but it may
// be 0 if this function changes *argv. ARG points to the location
// in *ARGV where the option starts, which may be helpful for a
// short option.
int (*special)(int argc, char** argv, char *arg, bool long_option,
Command_line*);
// If this is a position independent option which does not take an
// argument, this is the member function to call to record it.
void (General_options::*general_noarg)();
// If this is a position independent function which takes an
// argument, this is the member function to call to record it.
void (General_options::*general_arg)(const char*);
// If this is a position dependent option which does not take an
// argument, this is the member function to call to record it.
void (Position_dependent_options::*dependent_noarg)();
// If this is a position dependent option which takes an argument,
// this is the member function to record it.
void (Position_dependent_options::*dependent_arg)(const char*);
// Return whether this option takes an argument.
bool
takes_argument() const
{ return this->general_arg != NULL || this->dependent_arg != NULL; }
};
// We have a separate table for -z options.
struct options::One_z_option
{
// The name of the option.
const char* name;
// The member function in General_options called to record it.
void (General_options::*set)();
};
class options::Command_line_options
{
public:
static const One_option options[];
static const int options_size;
static const One_z_option z_options[];
static const int z_options_size;
};
} // End namespace gold.
namespace
{
// Handle the special -l option, which adds an input file.
int
library(int argc, char** argv, char* arg, bool long_option,
gold::Command_line* cmdline)
{
return cmdline->process_l_option(argc, argv, arg, long_option);
}
// Handle the special -T/--script option, which reads a linker script.
int
invoke_script(int argc, char** argv, char* arg, bool long_option,
gold::Command_line* cmdline)
{
int ret;
const char* script_name = cmdline->get_special_argument("script", argc, argv,
arg, long_option,
&ret);
if (!read_commandline_script(script_name, cmdline))
gold::gold_error(_("%s: unable to parse script file %s\n"),
gold::program_name, arg);
return ret;
}
// Handle the special --start-group option.
int
start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
{
cmdline->start_group(arg);
return 1;
}
// Handle the special --end-group option.
int
end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
{
cmdline->end_group(arg);
return 1;
}
// Report usage information for ld --help, and exit.
int
help(int, char**, char*, bool, gold::Command_line*)
{
printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
const int options_size = gold::options::Command_line_options::options_size;
const gold::options::One_option* options =
gold::options::Command_line_options::options;
for (int i = 0; i < options_size; ++i)
{
if (options[i].doc == NULL)
continue;
printf(" ");
int len = 2;
bool comma = false;
int j = i;
do
{
if (options[j].help_output != NULL)
{
if (comma)
{
printf(", ");
len += 2;
}
printf(options[j].help_output);
len += std::strlen(options[i].help_output);
comma = true;
}
else
{
if (options[j].short_option != '\0')
{
if (comma)
{
printf(", ");
len += 2;
}
printf("-%c", options[j].short_option);
len += 2;
comma = true;
}
if (options[j].long_option != NULL)
{
if (comma)
{
printf(", ");
len += 2;
}
if (options[j].dash == gold::options::One_option::ONE_DASH)
{
printf("-");
++len;
}
else
{
printf("--");
len += 2;
}
printf("%s", options[j].long_option);
len += std::strlen(options[j].long_option);
comma = true;
}
}
++j;
}
while (j < options_size && options[j].doc == NULL);
if (len >= 30)
{
printf("\n");
len = 0;
}
for (; len < 30; ++len)
std::putchar(' ');
std::puts(options[i].doc);
}
::exit(0);
return 0;
}
// Report version information.
int
version(int, char**, char* opt, bool, gold::Command_line*)
{
gold::print_version(opt[0] == 'v' && opt[1] == '\0');
::exit(0);
return 0;
}
// If the default sysroot is relocatable, try relocating it based on
// the prefix FROM.
char*
get_relative_sysroot(const char* from)
{
char* path = make_relative_prefix(gold::program_name, from,
TARGET_SYSTEM_ROOT);
if (path != NULL)
{
struct stat s;
if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
return path;
free(path);
}
return NULL;
}
// Return the default sysroot. This is set by the --with-sysroot
// option to configure.
std::string
get_default_sysroot()
{
const char* sysroot = TARGET_SYSTEM_ROOT;
if (*sysroot == '\0')
return "";
if (TARGET_SYSTEM_ROOT_RELOCATABLE)
{
char* path = get_relative_sysroot (BINDIR);
if (path == NULL)
path = get_relative_sysroot (TOOLBINDIR);
if (path != NULL)
{
std::string ret = path;
free(path);
return ret;
}
}
return sysroot;
}
} // End anonymous namespace.
namespace gold
{
// Helper macros used to specify the options. We could also do this
// using constructors, but then g++ would generate code to initialize
// the array. We want the array to be initialized statically so that
// we get better startup time.
#define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
{ short_option, long_option, doc, help, options::One_option::dash, \
NULL, func, NULL, NULL, NULL }
#define GENERAL_ARG(short_option, long_option, doc, help, dash, func) \
{ short_option, long_option, doc, help, options::One_option::dash, \
NULL, NULL, func, NULL, NULL }
#define POSDEP_NOARG(short_option, long_option, doc, help, dash, func) \
{ short_option, long_option, doc, help, options::One_option::dash, \
NULL, NULL, NULL, func, NULL }
#define POSDEP_ARG(short_option, long_option, doc, help, dash, func) \
{ short_option, long_option, doc, help, options::One_option::dash, \
NULL, NULL, NULL, NULL, func }
#define SPECIAL(short_option, long_option, doc, help, dash, func) \
{ short_option, long_option, doc, help, options::One_option::dash, \
func, NULL, NULL, NULL, NULL }
// Here is the actual list of options which we accept.
const options::One_option
options::Command_line_options::options[] =
{
POSDEP_NOARG('\0', "as-needed",
N_("Only set DT_NEEDED for dynamic libs if used"),
NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
POSDEP_NOARG('\0', "no-as-needed",
N_("Always DT_NEEDED for dynamic libs (default)"),
NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
POSDEP_NOARG('\0', "Bdynamic",
N_("-l searches for shared libraries"),
NULL, ONE_DASH,
&Position_dependent_options::set_dynamic_search),
POSDEP_NOARG('\0', "Bstatic",
N_("-l does not search for shared libraries"),
NULL, ONE_DASH,
&Position_dependent_options::set_static_search),
GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
NULL, ONE_DASH, &General_options::set_symbolic),
GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
NULL, TWO_DASHES, &General_options::set_export_dynamic),
GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
&General_options::set_dynamic_linker),
SPECIAL('l', "library", N_("Search for library LIBNAME"),
N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
&library),
GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
N_("-L DIR, --library-path DIR"), TWO_DASHES,
&General_options::add_to_search_path),
GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
&General_options::ignore),
GENERAL_ARG('o', "output", N_("Set output file name"),
N_("-o FILE, --output FILE"), TWO_DASHES,
&General_options::set_output_file_name),
GENERAL_ARG('O', NULL, N_("Optimize output file size"),
N_("-O level"), ONE_DASH,
&General_options::set_optimization_level),
GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
ONE_DASH, &General_options::set_relocatable),
GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
N_("-R DIR, -rpath DIR"), ONE_DASH,
&General_options::add_to_rpath),
GENERAL_ARG('\0', "rpath-link",
N_("Add DIR to link time shared library search path"),
N_("--rpath-link DIR"), TWO_DASHES,
&General_options::add_to_rpath_link),
GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
TWO_DASHES, &General_options::set_strip_all),
GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
TWO_DASHES, &General_options::set_strip_debug),
GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
NULL, ONE_DASH, &General_options::set_shared),
GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
NULL, ONE_DASH, &General_options::set_static),
GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
NULL, TWO_DASHES, &General_options::set_stats),
GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
N_("-Ttext ADDRESS"), ONE_DASH,
&General_options::set_text_segment_address),
// This must come after -Ttext since it's a prefix of it.
SPECIAL('T', "script", N_("Read linker script"),
N_("-T FILE, --script FILE"), TWO_DASHES,
&invoke_script),
GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
NULL, TWO_DASHES, &General_options::set_threads),
GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
NULL, TWO_DASHES, &General_options::clear_threads),
GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
N_("--thread-count COUNT"), TWO_DASHES,
&General_options::set_thread_count),
GENERAL_ARG('\0', "thread-count-initial",
N_("Number of threads to use in initial pass"),
N_("--thread-count-initial COUNT"), TWO_DASHES,
&General_options::set_thread_count_initial),
GENERAL_ARG('\0', "thread-count-middle",
N_("Number of threads to use in middle pass"),
N_("--thread-count-middle COUNT"), TWO_DASHES,
&General_options::set_thread_count_middle),
GENERAL_ARG('\0', "thread-count-final",
N_("Number of threads to use in final pass"),
N_("--thread-count-final COUNT"), TWO_DASHES,
&General_options::set_thread_count_final),
POSDEP_NOARG('\0', "whole-archive",
N_("Include all archive contents"),
NULL, TWO_DASHES,
&Position_dependent_options::set_whole_archive),
POSDEP_NOARG('\0', "no-whole-archive",
N_("Include only needed archive contents"),
NULL, TWO_DASHES,
&Position_dependent_options::clear_whole_archive),
GENERAL_ARG('z', NULL,
N_("Subcommands as follows:\n\
-z execstack Mark output as requiring executable stack\n\
-z noexecstack Mark output as not requiring executable stack"),
N_("-z SUBCOMMAND"), ONE_DASH,
&General_options::handle_z_option),
SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
TWO_DASHES, &start_group),
SPECIAL(')', "end-group", N_("End a library search group"), NULL,
TWO_DASHES, &end_group),
SPECIAL('\0', "help", N_("Report usage information"), NULL,
TWO_DASHES, &help),
SPECIAL('v', "version", N_("Report version information"), NULL,
TWO_DASHES, &version)
};
const int options::Command_line_options::options_size =
sizeof (options) / sizeof (options[0]);
// The -z options.
const options::One_z_option
options::Command_line_options::z_options[] =
{
{ "execstack", &General_options::set_execstack },
{ "noexecstack", &General_options::set_noexecstack },
};
const int options::Command_line_options::z_options_size =
sizeof(z_options) / sizeof(z_options[0]);
// The default values for the general options.
General_options::General_options()
: export_dynamic_(false),
dynamic_linker_(NULL),
search_path_(),
optimization_level_(0),
output_file_name_("a.out"),
is_relocatable_(false),
strip_(STRIP_NONE),
symbolic_(false),
create_eh_frame_hdr_(false),
rpath_(),
rpath_link_(),
is_shared_(false),
is_static_(false),
print_stats_(false),
sysroot_(),
text_segment_address_(-1U), // -1 indicates value not set by user
threads_(false),
thread_count_initial_(0),
thread_count_middle_(0),
thread_count_final_(0),
execstack_(EXECSTACK_FROM_INPUT)
{
}
// The default values for the position dependent options.
Position_dependent_options::Position_dependent_options()
: do_static_search_(false),
as_needed_(false),
include_whole_archive_(false)
{
}
// Handle the -z option.
void
General_options::handle_z_option(const char* arg)
{
const int z_options_size = options::Command_line_options::z_options_size;
const gold::options::One_z_option* z_options =
gold::options::Command_line_options::z_options;
for (int i = 0; i < z_options_size; ++i)
{
if (strcmp(arg, z_options[i].name) == 0)
{
(this->*(z_options[i].set))();
return;
}
}
fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
program_name, arg);
::exit(1);
}
// Add the sysroot, if any, to the search paths.
void
General_options::add_sysroot()
{
if (this->sysroot_.empty())
{
this->sysroot_ = get_default_sysroot();
if (this->sysroot_.empty())
return;
}
const char* sysroot = this->sysroot_.c_str();
char* canonical_sysroot = lrealpath(sysroot);
for (Dir_list::iterator p = this->search_path_.begin();
p != this->search_path_.end();
++p)
p->add_sysroot(sysroot, canonical_sysroot);
free(canonical_sysroot);
}
// Search_directory methods.
// This is called if we have a sysroot. Apply the sysroot if
// appropriate. Record whether the directory is in the sysroot.
void
Search_directory::add_sysroot(const char* sysroot,
const char* canonical_sysroot)
{
gold_assert(*sysroot != '\0');
if (this->put_in_sysroot_)
{
if (!IS_DIR_SEPARATOR(this->name_[0])
&& !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
this->name_ = '/' + this->name_;
this->name_ = sysroot + this->name_;
this->is_in_sysroot_ = true;
}
else
{
// Check whether this entry is in the sysroot. To do this
// correctly, we need to use canonical names. Otherwise we will
// get confused by the ../../.. paths that gcc tends to use.
char* canonical_name = lrealpath(this->name_.c_str());
int canonical_name_len = strlen(canonical_name);
int canonical_sysroot_len = strlen(canonical_sysroot);
if (canonical_name_len > canonical_sysroot_len
&& IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
{
canonical_name[canonical_sysroot_len] = '\0';
if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
this->is_in_sysroot_ = true;
}
free(canonical_name);
}
}
// Input_arguments methods.
// Add a file to the list.
void
Input_arguments::add_file(const Input_file_argument& file)
{
if (!this->in_group_)
this->input_argument_list_.push_back(Input_argument(file));
else
{
gold_assert(!this->input_argument_list_.empty());
gold_assert(this->input_argument_list_.back().is_group());
this->input_argument_list_.back().group()->add_file(file);
}
}
// Start a group.
void
Input_arguments::start_group()
{
gold_assert(!this->in_group_);
Input_file_group* group = new Input_file_group();
this->input_argument_list_.push_back(Input_argument(group));
this->in_group_ = true;
}
// End a group.
void
Input_arguments::end_group()
{
gold_assert(this->in_group_);
this->in_group_ = false;
}
// Command_line options.
Command_line::Command_line()
: options_(), position_options_(), inputs_()
{
}
// Process the command line options. For process_one_option,
// i is the index of argv to process next, and the return value
// is the index of the next option to process (i+1 or i+2, or argc
// to indicate processing is done). no_more_options is set to true
// if (and when) "--" is seen as an option.
int
Command_line::process_one_option(int argc, char** argv, int i,
bool* no_more_options)
{
const int options_size = options::Command_line_options::options_size;
const options::One_option* options = options::Command_line_options::options;
gold_assert(i < argc);
if (argv[i][0] != '-' || *no_more_options)
{
this->add_file(argv[i], false);
return i + 1;
}
// Option starting with '-'.
int dashes = 1;
if (argv[i][1] == '-')
{
dashes = 2;
if (argv[i][2] == '\0')
{
*no_more_options = true;
return i + 1;
}
}
// Look for a long option match.
char* opt = argv[i] + dashes;
char first = opt[0];
int skiparg = 0;
char* arg = strchr(opt, '=');
bool argument_with_equals = arg != NULL;
if (arg != NULL)
{
*arg = '\0';
++arg;
}
else if (i + 1 < argc)
{
arg = argv[i + 1];
skiparg = 1;
}
int j;
for (j = 0; j < options_size; ++j)
{
if (options[j].long_option != NULL
&& (dashes == 2
|| (options[j].dash
!= options::One_option::EXACTLY_TWO_DASHES))
&& first == options[j].long_option[0]
&& strcmp(opt, options[j].long_option) == 0)
{
if (options[j].special)
{
// Restore the '=' we clobbered above.
if (arg != NULL && skiparg == 0)
arg[-1] = '=';
i += options[j].special(argc - i, argv + i, opt, true, this);
}
else
{
if (!options[j].takes_argument())
{
if (argument_with_equals)
this->usage(_("unexpected argument"), argv[i]);
arg = NULL;
skiparg = 0;
}
else
{
if (arg == NULL)
this->usage(_("missing argument"), argv[i]);
}
this->apply_option(options[j], arg);
i += skiparg + 1;
}
break;
}
}
if (j < options_size)
return i;
// If we saw two dashes, we needed to have seen a long option.
if (dashes == 2)
this->usage(_("unknown option"), argv[i]);
// Look for a short option match. There may be more than one
// short option in a given argument.
bool done = false;
char* s = argv[i] + 1;
++i;
while (*s != '\0' && !done)
{
char opt = *s;
int j;
for (j = 0; j < options_size; ++j)
{
if (options[j].short_option == opt)
{
if (options[j].special)
{
// Undo the argument skip done above.
--i;
i += options[j].special(argc - i, argv + i, s, false,
this);
done = true;
}
else
{
arg = NULL;
if (options[j].takes_argument())
{
if (s[1] != '\0')
{
arg = s + 1;
done = true;
}
else if (i < argc)
{
arg = argv[i];
++i;
}
else
this->usage(_("missing argument"), opt);
}
this->apply_option(options[j], arg);
}
break;
}
}
if (j >= options_size)
this->usage(_("unknown option"), *s);
++s;
}
return i;
}
void
Command_line::process(int argc, char** argv)
{
bool no_more_options = false;
int i = 0;
while (i < argc)
i = process_one_option(argc, argv, i, &no_more_options);
if (this->inputs_.in_group())
{
fprintf(stderr, _("%s: missing group end\n"), program_name);
this->usage();
}
// FIXME: We should only do this when configured in native mode.
this->options_.add_to_search_path_with_sysroot("/lib");
this->options_.add_to_search_path_with_sysroot("/usr/lib");
this->options_.add_sysroot();
// Ensure options don't contradict each other and are otherwise kosher.
this->normalize_options();
}
// Extract an option argument for a special option. LONGNAME is the
// long name of the option. This sets *PRET to the return value for
// the special function handler to skip to the next option.
const char*
Command_line::get_special_argument(const char* longname, int argc, char** argv,
const char* arg, bool long_option,
int *pret)
{
if (long_option)
{
size_t longlen = strlen(longname);
gold_assert(strncmp(arg, longname, longlen) == 0);
arg += longlen;
if (*arg == '=')
{
*pret = 1;
return arg + 1;
}
else if (argc > 1)
{
gold_assert(*arg == '\0');
*pret = 2;
return argv[1];
}
}
else
{
if (arg[1] != '\0')
{
*pret = 1;
return arg + 1;
}
else if (argc > 1)
{
*pret = 2;
return argv[1];
}
}
this->usage(_("missing argument"), arg);
}
// Ensure options don't contradict each other and are otherwise kosher.
void
Command_line::normalize_options()
{
// If the user specifies both -s and -r, convert the -s as -S.
// -r requires us to keep externally visible symbols!
if (this->options_.strip_all() && this->options_.is_relocatable())
{
// Clears the strip_all() status, replacing it with strip_debug().
this->options_.set_strip_debug();
}
// FIXME: we can/should be doing a lot more sanity checking here.
}
// Apply a command line option.
void
Command_line::apply_option(const options::One_option& opt,
const char* arg)
{
if (arg == NULL)
{
if (opt.general_noarg)
(this->options_.*(opt.general_noarg))();
else if (opt.dependent_noarg)
(this->position_options_.*(opt.dependent_noarg))();
else
gold_unreachable();
}
else
{
if (opt.general_arg)
(this->options_.*(opt.general_arg))(arg);
else if (opt.dependent_arg)
(this->position_options_.*(opt.dependent_arg))(arg);
else
gold_unreachable();
}
}
// Add an input file or library.
void
Command_line::add_file(const char* name, bool is_lib)
{
Input_file_argument file(name, is_lib, "", this->position_options_);
this->inputs_.add_file(file);
}
// Handle the -l option, which requires special treatment.
int
Command_line::process_l_option(int argc, char** argv, char* arg,
bool long_option)
{
int ret;
const char* libname = this->get_special_argument("library", argc, argv, arg,
long_option, &ret);
this->add_file(libname, true);
return ret;
}
// Handle the --start-group option.
void
Command_line::start_group(const char* arg)
{
if (this->inputs_.in_group())
this->usage(_("may not nest groups"), arg);
this->inputs_.start_group();
}
// Handle the --end-group option.
void
Command_line::end_group(const char* arg)
{
if (!this->inputs_.in_group())
this->usage(_("group end without group start"), arg);
this->inputs_.end_group();
}
// Report a usage error. */
void
Command_line::usage()
{
fprintf(stderr,
_("%s: use the --help option for usage information\n"),
program_name);
::exit(1);
}
void
Command_line::usage(const char* msg, const char *opt)
{
fprintf(stderr,
_("%s: %s: %s\n"),
program_name, opt, msg);
this->usage();
}
void
Command_line::usage(const char* msg, char opt)
{
fprintf(stderr,
_("%s: -%c: %s\n"),
program_name, opt, msg);
this->usage();
}
} // End namespace gold.
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