diff options
Diffstat (limited to 'gold/options.cc')
| -rw-r--r-- | gold/options.cc | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/gold/options.cc b/gold/options.cc new file mode 100644 index 000000000000..b8339e8a6253 --- /dev/null +++ b/gold/options.cc @@ -0,0 +1,579 @@ +// options.c -- handle command line options for gold + +#include <iostream> + +#include "gold.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, 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; } +}; + +class options::Command_line_options +{ + public: + static const One_option options[]; + static const int options_size; +}; + +} // End namespace gold. + +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; +} + +// 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); + } + else + { + if (options[j].short_option != '\0') + { + if (comma) + { + printf(", "); + len += 2; + } + printf("-%c", options[j].short_option); + len += 2; + } + + 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); + } + } + ++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); + } + + gold::gold_exit(true); + + return 0; +} + +} // 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[] = +{ + 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_ARG('I', "dynamic-linker", N_("Set dynamic linker path"), + N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES, + &General_options::set_dynamic_linker), + 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_NOARG('r', NULL, N_("Generate relocatable output"), NULL, + ONE_DASH, &General_options::set_relocatable), + 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), + POSDEP_NOARG('\0', "as-needed", + N_("Only set DT_NEEDED for following dynamic libs if used"), + NULL, TWO_DASHES, &Position_dependent_options::set_as_needed), + POSDEP_NOARG('\0', "no-as-needed", + N_("Always DT_NEEDED for following dynamic libs (default)"), + NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed), + SPECIAL('\0', "help", N_("Report usage information"), NULL, + TWO_DASHES, &help) +}; + +const int options::Command_line_options::options_size = + sizeof (options) / sizeof (options[0]); + +// The default values for the general options. + +General_options::General_options() + : dynamic_linker_(NULL), + search_path_(), + output_file_name_("a.out"), + is_relocatable_(false), + is_shared_(false), + is_static_(false) +{ +} + +// The default values for the position dependent options. + +Position_dependent_options::Position_dependent_options() + : do_static_search_(false) +{ +} + +// 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. + +void +Command_line::process(int argc, char** argv) +{ + const int options_size = options::Command_line_options::options_size; + const options::One_option* options = + options::Command_line_options::options; + bool no_more_options = false; + int i = 0; + while (i < argc) + { + if (argv[i][0] != '-' || no_more_options) + { + this->add_file(argv[i], false); + ++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)) + && 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"); +} + +// 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) +{ + 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(); +} + +// Report a usage error. */ + +void +Command_line::usage() +{ + fprintf(stderr, + _("%s: use the --help option for usage information\n"), + program_name); + gold_exit(false); +} + +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. |