binutils-gdb/gold/options.cc

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// options.c -- handle command line options for gold
#include <iostream>
#include "gold.h"
#include "options.h"
namespace gold
{
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// The information we keep for a single command line option.
struct options::One_option
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{
// 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, Command_line*);
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// 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)();
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// 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*);
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// 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)();
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// 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*);
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// Return whether this option takes an argument.
bool
takes_argument() const
{ return this->general_arg != NULL || this->dependent_arg != NULL; }
};
class options::Command_line_options
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{
public:
static const One_option options[];
static const int options_size;
};
} // End namespace gold.
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namespace
{
// Handle the special -l option, which adds an input file.
int
library(int argc, char** argv, char* arg, gold::Command_line* cmdline)
{
return cmdline->process_l_option(argc, argv, arg);
}
// Handle the special --start-group option.
int
start_group(int, char**, char* arg, gold::Command_line* cmdline)
{
cmdline->start_group(arg);
return 1;
}
// Handle the special --end-group option.
int
end_group(int, char**, char* arg, gold::Command_line* cmdline)
{
cmdline->end_group(arg);
return 1;
}
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// Report usage information for ld --help, and exit.
int
help(int, char**, char*, 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;
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}
else
{
if (options[j].short_option != '\0')
{
if (comma)
{
printf(", ");
len += 2;
}
printf("-%c", options[j].short_option);
len += 2;
comma = true;
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}
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;
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}
}
++j;
}
while (j < options_size && options[j].doc == NULL);
if (len >= 30)
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{
printf("\n");
len = 0;
}
for (; len < 30; ++len)
std::putchar(' ');
std::puts(options[i].doc);
}
gold::gold_exit(true);
return 0;
}
} // End anonymous namespace.
namespace gold
{
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// 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, \
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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, \
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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, \
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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, \
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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, \
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func, NULL, NULL, NULL, NULL }
// Here is the actual list of options which we accept.
const options::One_option
options::Command_line_options::options[] =
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{
SPECIAL('l', "library", N_("Search for library LIBNAME"),
N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
&library),
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),
GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
NULL, TWO_DASHES, &General_options::set_export_dynamic),
GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
&General_options::set_dynamic_linker),
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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),
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GENERAL_ARG('O', NULL, N_("Optimize output file size"),
N_("-O level"), ONE_DASH,
&General_options::set_optimization_level),
GENERAL_ARG('o', "output", N_("Set output file name"),
N_("-o FILE, --output FILE"), TWO_DASHES,
&General_options::set_output_file_name),
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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"),
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N_("-R DIR, -rpath DIR"), ONE_DASH,
&General_options::add_to_rpath),
GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
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NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
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('\0', "shared", N_("Generate shared library"),
NULL, ONE_DASH, &General_options::set_shared),
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GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
NULL, ONE_DASH, &General_options::set_static),
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),
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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),
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SPECIAL('\0', "help", N_("Report usage information"), NULL,
TWO_DASHES, &help)
};
const int options::Command_line_options::options_size =
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sizeof (options) / sizeof (options[0]);
// The default values for the general options.
General_options::General_options()
: export_dynamic_(false),
dynamic_linker_(NULL),
search_path_(),
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optimization_level_(0),
output_file_name_("a.out"),
is_relocatable_(false),
create_eh_frame_hdr_(false),
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rpath_(),
rpath_link_(),
is_shared_(false),
is_static_(false)
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{
}
// The default values for the position dependent options.
Position_dependent_options::Position_dependent_options()
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: do_static_search_(false),
as_needed_(false),
include_whole_archive_(false)
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{
}
// 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.
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Command_line::Command_line()
: options_(), position_options_(), inputs_()
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{
}
// Process the command line options.
void
Command_line::process(int argc, char** argv)
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{
const int options_size = options::Command_line_options::options_size;
const options::One_option* options =
options::Command_line_options::options;
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bool no_more_options = false;
int i = 0;
while (i < argc)
{
if (argv[i][0] != '-' || no_more_options)
{
this->add_file(argv[i], false);
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++i;
continue;
}
// Option starting with '-'.
int dashes = 1;
if (argv[i][1] == '-')
{
dashes = 2;
if (argv[i][2] == '\0')
{
no_more_options = true;
continue;
}
}
// Look for a long option match.
char* opt = argv[i] + dashes;
char first = opt[0];
int skiparg = 0;
char* arg = strchr(opt, '=');
if (arg != NULL)
*arg = '\0';
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))
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&& first == options[j].long_option[0]
&& strcmp(opt, options[j].long_option) == 0)
{
if (options[j].special)
i += options[j].special(argc - 1, argv + i, opt, this);
else
{
if (!options[j].takes_argument())
{
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)
continue;
// If we saw two dashes, we need to see 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, 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;
}
}
if (this->inputs_.in_group())
{
fprintf(stderr, _("%s: missing group end"), program_name);
this->usage();
}
// FIXME: We should only do this when configured in native mode.
this->options_.add_to_search_path("/lib");
this->options_.add_to_search_path("/usr/lib");
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}
// Apply a command line option.
void
Command_line::apply_option(const options::One_option& opt,
const char* arg)
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{
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();
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}
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();
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}
}
// 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)
{
int ret;
const char* libname;
if (arg[1] != '\0')
{
ret = 1;
libname = arg + 1;
}
else if (argc > 1)
{
ret = 2;
libname = argv[argc + 1];
}
else
this->usage(_("missing argument"), arg);
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();
}
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// Report a usage error. */
void
Command_line::usage()
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{
fprintf(stderr,
_("%s: use the --help option for usage information\n"),
program_name);
gold_exit(false);
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}
void
Command_line::usage(const char* msg, const char *opt)
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{
fprintf(stderr,
_("%s: %s: %s\n"),
program_name, opt, msg);
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this->usage();
}
void
Command_line::usage(const char* msg, char opt)
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{
fprintf(stderr,
_("%s: -%c: %s\n"),
program_name, opt, msg);
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this->usage();
}
} // End namespace gold.