| // 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. |