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// options.h -- handle command line options for gold -*- C++ -*- // Copyright 2006, 2007, 2008, 2009, 2010 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. // General_options (from Command_line::options()) // All the options (a.k.a. command-line flags) // Input_argument (from Command_line::inputs()) // The list of input files, including -l options. // Command_line // Everything we get from the command line -- the General_options // plus the Input_arguments. // // There are also some smaller classes, such as // Position_dependent_options which hold a subset of General_options // that change as options are parsed (as opposed to the usual behavior // of the last instance of that option specified on the commandline wins). #ifndef GOLD_OPTIONS_H #define GOLD_OPTIONS_H #include <cstdlib> #include <cstring> #include <list> #include <string> #include <vector> #include "elfcpp.h" #include "script.h" namespace gold { class Command_line; class General_options; class Search_directory; class Input_file_group; class Position_dependent_options; class Target; class Plugin_manager; // Incremental build action for a specific file, as selected by the user. enum Incremental_disposition { // Determine the status from the timestamp (default). INCREMENTAL_CHECK, // Assume the file changed from the previous build. INCREMENTAL_CHANGED, // Assume the file didn't change from the previous build. INCREMENTAL_UNCHANGED }; // The nested namespace is to contain all the global variables and // structs that need to be defined in the .h file, but do not need to // be used outside this class. namespace options { typedef std::vector<Search_directory> Dir_list; typedef Unordered_set<std::string> String_set; // These routines convert from a string option to various types. // Each gives a fatal error if it cannot parse the argument. extern void parse_bool(const char* option_name, const char* arg, bool* retval); extern void parse_int(const char* option_name, const char* arg, int* retval); extern void parse_uint(const char* option_name, const char* arg, int* retval); extern void parse_uint64(const char* option_name, const char* arg, uint64_t* retval); extern void parse_double(const char* option_name, const char* arg, double* retval); extern void parse_string(const char* option_name, const char* arg, const char** retval); extern void parse_optional_string(const char* option_name, const char* arg, const char** retval); extern void parse_dirlist(const char* option_name, const char* arg, Dir_list* retval); extern void parse_set(const char* option_name, const char* arg, String_set* retval); extern void parse_choices(const char* option_name, const char* arg, const char** retval, const char* choices[], int num_choices); struct Struct_var; // Most options have both a shortname (one letter) and a longname. // This enum controls how many dashes are expected for longname access // -- shortnames always use one dash. Most longnames will accept // either one dash or two; the only difference between ONE_DASH and // TWO_DASHES is how we print the option in --help. However, some // longnames require two dashes, and some require only one. The // special value DASH_Z means that the option is preceded by "-z". enum Dashes { ONE_DASH, TWO_DASHES, EXACTLY_ONE_DASH, EXACTLY_TWO_DASHES, DASH_Z }; // LONGNAME is the long-name of the option with dashes converted to // underscores, or else the short-name if the option has no long-name. // It is never the empty string. // DASHES is an instance of the Dashes enum: ONE_DASH, TWO_DASHES, etc. // SHORTNAME is the short-name of the option, as a char, or '\0' if the // option has no short-name. If the option has no long-name, you // should specify the short-name in *both* VARNAME and here. // DEFAULT_VALUE is the value of the option if not specified on the // commandline, as a string. // HELPSTRING is the descriptive text used with the option via --help // HELPARG is how you define the argument to the option. // --help output is "-shortname HELPARG, --longname HELPARG: HELPSTRING" // HELPARG should be NULL iff the option is a bool and takes no arg. // OPTIONAL_ARG is true if this option takes an optional argument. An // optional argument must be specifid as --OPTION=VALUE, not // --OPTION VALUE. // READER provides parse_to_value, which is a function that will convert // a char* argument into the proper type and store it in some variable. // A One_option struct initializes itself with the global list of options // at constructor time, so be careful making one of these. struct One_option { std::string longname; Dashes dashes; char shortname; const char* default_value; const char* helpstring; const char* helparg; bool optional_arg; Struct_var* reader; One_option(const char* ln, Dashes d, char sn, const char* dv, const char* hs, const char* ha, bool oa, Struct_var* r) : longname(ln), dashes(d), shortname(sn), default_value(dv ? dv : ""), helpstring(hs), helparg(ha), optional_arg(oa), reader(r) { // In longname, we convert all underscores to dashes, since GNU // style uses dashes in option names. longname is likely to have // underscores in it because it's also used to declare a C++ // function. const char* pos = strchr(this->longname.c_str(), '_'); for (; pos; pos = strchr(pos, '_')) this->longname[pos - this->longname.c_str()] = '-'; // We only register ourselves if our helpstring is not NULL. This // is to support the "no-VAR" boolean variables, which we // conditionally turn on by defining "no-VAR" help text. if (this->helpstring) this->register_option(); } // This option takes an argument iff helparg is not NULL. bool takes_argument() const { return this->helparg != NULL; } // Whether the argument is optional. bool takes_optional_argument() const { return this->optional_arg; } // Register this option with the global list of options. void register_option(); // Print this option to stdout (used with --help). void print() const; }; // All options have a Struct_##varname that inherits from this and // actually implements parse_to_value for that option. struct Struct_var { // OPTION: the name of the option as specified on the commandline, // including leading dashes, and any text following the option: // "-O", "--defsym=mysym=0x1000", etc. // ARG: the arg associated with this option, or NULL if the option // takes no argument: "2", "mysym=0x1000", etc. // CMDLINE: the global Command_line object. Used by DEFINE_special. // OPTIONS: the global General_options object. Used by DEFINE_special. virtual void parse_to_value(const char* option, const char* arg, Command_line* cmdline, General_options* options) = 0; virtual ~Struct_var() // To make gcc happy. { } }; // This is for "special" options that aren't of any predefined type. struct Struct_special : public Struct_var { // If you change this, change the parse-fn in DEFINE_special as well. typedef void (General_options::*Parse_function)(const char*, const char*, Command_line*); Struct_special(const char* varname, Dashes dashes, char shortname, Parse_function parse_function, const char* helpstring, const char* helparg) : option(varname, dashes, shortname, "", helpstring, helparg, false, this), parse(parse_function) { } void parse_to_value(const char* option, const char* arg, Command_line* cmdline, General_options* options) { (options->*(this->parse))(option, arg, cmdline); } One_option option; Parse_function parse; }; } // End namespace options. // These are helper macros use by DEFINE_uint64/etc below. // This macro is used inside the General_options_ class, so defines // var() and set_var() as General_options methods. Arguments as are // for the constructor for One_option. param_type__ is the same as // type__ for built-in types, and "const type__ &" otherwise. #define DEFINE_var(varname__, dashes__, shortname__, default_value__, \ default_value_as_string__, helpstring__, helparg__, \ optional_arg__, type__, param_type__, parse_fn__) \ public: \ param_type__ \ varname__() const \ { return this->varname__##_.value; } \ \ bool \ user_set_##varname__() const \ { return this->varname__##_.user_set_via_option; } \ \ void \ set_user_set_##varname__() \ { this->varname__##_.user_set_via_option = true; } \ \ private: \ struct Struct_##varname__ : public options::Struct_var \ { \ Struct_##varname__() \ : option(#varname__, dashes__, shortname__, default_value_as_string__, \ helpstring__, helparg__, optional_arg__, this), \ user_set_via_option(false), value(default_value__) \ { } \ \ void \ parse_to_value(const char* option_name, const char* arg, \ Command_line*, General_options*) \ { \ parse_fn__(option_name, arg, &this->value); \ this->user_set_via_option = true; \ } \ \ options::One_option option; \ bool user_set_via_option; \ type__ value; \ }; \ Struct_##varname__ varname__##_; \ void \ set_##varname__(param_type__ value) \ { this->varname__##_.value = value; } // These macros allow for easy addition of a new commandline option. // If no_helpstring__ is not NULL, then in addition to creating // VARNAME, we also create an option called no-VARNAME (or, for a -z // option, noVARNAME). #define DEFINE_bool(varname__, dashes__, shortname__, default_value__, \ helpstring__, no_helpstring__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ default_value__ ? "true" : "false", helpstring__, NULL, \ false, bool, bool, options::parse_bool) \ struct Struct_no_##varname__ : public options::Struct_var \ { \ Struct_no_##varname__() : option((dashes__ == options::DASH_Z \ ? "no" #varname__ \ : "no-" #varname__), \ dashes__, '\0', \ default_value__ ? "false" : "true", \ no_helpstring__, NULL, false, this) \ { } \ \ void \ parse_to_value(const char*, const char*, \ Command_line*, General_options* options) \ { options->set_##varname__(false); } \ \ options::One_option option; \ }; \ Struct_no_##varname__ no_##varname__##_initializer_ #define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \ helpstring__, no_helpstring__) \ DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \ default_value__ ? "true" : "false", helpstring__, NULL, \ false, bool, bool, options::parse_bool) \ struct Struct_disable_##varname__ : public options::Struct_var \ { \ Struct_disable_##varname__() : option("disable-" #varname__, \ dashes__, '\0', \ default_value__ ? "false" : "true", \ no_helpstring__, NULL, false, this) \ { } \ \ void \ parse_to_value(const char*, const char*, \ Command_line*, General_options* options) \ { options->set_enable_##varname__(false); } \ \ options::One_option option; \ }; \ Struct_disable_##varname__ disable_##varname__##_initializer_ #define DEFINE_int(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ #default_value__, helpstring__, helparg__, false, \ int, int, options::parse_int) #define DEFINE_uint(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ #default_value__, helpstring__, helparg__, false, \ int, int, options::parse_uint) #define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ #default_value__, helpstring__, helparg__, false, \ uint64_t, uint64_t, options::parse_uint64) #define DEFINE_double(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ #default_value__, helpstring__, helparg__, false, \ double, double, options::parse_double) #define DEFINE_string(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ default_value__, helpstring__, helparg__, false, \ const char*, const char*, options::parse_string) // This is like DEFINE_string, but we convert each occurrence to a // Search_directory and store it in a vector. Thus we also have the // add_to_VARNAME() method, to append to the vector. #define DEFINE_dirlist(varname__, dashes__, shortname__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, , \ "", helpstring__, helparg__, false, options::Dir_list, \ const options::Dir_list&, options::parse_dirlist) \ void \ add_to_##varname__(const char* new_value) \ { options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \ void \ add_search_directory_to_##varname__(const Search_directory& dir) \ { this->varname__##_.value.push_back(dir); } // This is like DEFINE_string, but we store a set of strings. #define DEFINE_set(varname__, dashes__, shortname__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, , \ "", helpstring__, helparg__, false, options::String_set, \ const options::String_set&, options::parse_set) \ public: \ bool \ any_##varname__() const \ { return !this->varname__##_.value.empty(); } \ \ bool \ is_##varname__(const char* symbol) const \ { \ return (!this->varname__##_.value.empty() \ && (this->varname__##_.value.find(std::string(symbol)) \ != this->varname__##_.value.end())); \ } \ \ options::String_set::const_iterator \ varname__##_begin() const \ { return this->varname__##_.value.begin(); } \ \ options::String_set::const_iterator \ varname__##_end() const \ { return this->varname__##_.value.end(); } // When you have a list of possible values (expressed as string) // After helparg__ should come an initializer list, like // {"foo", "bar", "baz"} #define DEFINE_enum(varname__, dashes__, shortname__, default_value__, \ helpstring__, helparg__, ...) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ default_value__, helpstring__, helparg__, false, \ const char*, const char*, parse_choices_##varname__) \ private: \ static void parse_choices_##varname__(const char* option_name, \ const char* arg, \ const char** retval) { \ const char* choices[] = __VA_ARGS__; \ options::parse_choices(option_name, arg, retval, \ choices, sizeof(choices) / sizeof(*choices)); \ } // This is like DEFINE_bool, but VARNAME is the name of a different // option. This option becomes an alias for that one. INVERT is true // if this option is an inversion of the other one. #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__, \ helpstring__, no_helpstring__, invert__) \ private: \ struct Struct_##option__ : public options::Struct_var \ { \ Struct_##option__() \ : option(#option__, dashes__, shortname__, "", helpstring__, \ NULL, false, this) \ { } \ \ void \ parse_to_value(const char*, const char*, \ Command_line*, General_options* options) \ { \ options->set_##varname__(!invert__); \ options->set_user_set_##varname__(); \ } \ \ options::One_option option; \ }; \ Struct_##option__ option__##_; \ \ struct Struct_no_##option__ : public options::Struct_var \ { \ Struct_no_##option__() \ : option((dashes__ == options::DASH_Z \ ? "no" #option__ \ : "no-" #option__), \ dashes__, '\0', "", no_helpstring__, \ NULL, false, this) \ { } \ \ void \ parse_to_value(const char*, const char*, \ Command_line*, General_options* options) \ { \ options->set_##varname__(invert__); \ options->set_user_set_##varname__(); \ } \ \ options::One_option option; \ }; \ Struct_no_##option__ no_##option__##_initializer_ // This is used for non-standard flags. It defines no functions; it // just calls General_options::parse_VARNAME whenever the flag is // seen. We declare parse_VARNAME as a static member of // General_options; you are responsible for defining it there. // helparg__ should be NULL iff this special-option is a boolean. #define DEFINE_special(varname__, dashes__, shortname__, \ helpstring__, helparg__) \ private: \ void parse_##varname__(const char* option, const char* arg, \ Command_line* inputs); \ struct Struct_##varname__ : public options::Struct_special \ { \ Struct_##varname__() \ : options::Struct_special(#varname__, dashes__, shortname__, \ &General_options::parse_##varname__, \ helpstring__, helparg__) \ { } \ }; \ Struct_##varname__ varname__##_initializer_ // An option that takes an optional string argument. If the option is // used with no argument, the value will be the default, and // user_set_via_option will be true. #define DEFINE_optional_string(varname__, dashes__, shortname__, \ default_value__, \ helpstring__, helparg__) \ DEFINE_var(varname__, dashes__, shortname__, default_value__, \ default_value__, helpstring__, helparg__, true, \ const char*, const char*, options::parse_optional_string) // A directory to search. For each directory we record whether it is // in the sysroot. We need to know this so that, if a linker script // is found within the sysroot, we will apply the sysroot to any files // named by that script. class Search_directory { public: // We need a default constructor because we put this in a // std::vector. Search_directory() : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false) { } // This is the usual constructor. Search_directory(const char* name, bool put_in_sysroot) : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false) { if (this->name_.empty()) this->name_ = "."; } // This is called if we have a sysroot. The sysroot is prefixed to // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is // set to true for any enries which are in the sysroot (this will // naturally include any entries for which put_in_sysroot_ is true). // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of // passing SYSROOT to lrealpath. void add_sysroot(const char* sysroot, const char* canonical_sysroot); // Get the directory name. const std::string& name() const { return this->name_; } // Return whether this directory is in the sysroot. bool is_in_sysroot() const { return this->is_in_sysroot_; } // Return whether this is considered a system directory. bool is_system_directory() const { return this->put_in_sysroot_ || this->is_in_sysroot_; } private: // The directory name. std::string name_; // True if the sysroot should be added as a prefix for this // directory (if there is a sysroot). This is true for system // directories that we search by default. bool put_in_sysroot_; // True if this directory is in the sysroot (if there is a sysroot). // This is true if there is a sysroot and either 1) put_in_sysroot_ // is true, or 2) the directory happens to be in the sysroot based // on a pathname comparison. bool is_in_sysroot_; }; class General_options { private: // NOTE: For every option that you add here, also consider if you // should add it to Position_dependent_options. DEFINE_special(help, options::TWO_DASHES, '\0', N_("Report usage information"), NULL); DEFINE_special(version, options::TWO_DASHES, 'v', N_("Report version information"), NULL); DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0', N_("Report version and target information"), NULL); // These options are sorted approximately so that for each letter in // the alphabet, we show the option whose shortname is that letter // (if any) and then every longname that starts with that letter (in // alphabetical order). For both, lowercase sorts before uppercase. // The -z options come last. DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false, N_("Not supported"), N_("Do not copy DT_NEEDED tags from shared libraries")); DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false, N_("Allow unresolved references in shared libraries"), N_("Do not allow unresolved references in shared libraries")); DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false, N_("Only set DT_NEEDED for shared libraries if used"), N_("Always DT_NEEDED for shared libraries")); // This should really be an "enum", but it's too easy for folks to // forget to update the list as they add new targets. So we just // accept any string. We'll fail later (when the string is parsed), // if the target isn't actually supported. DEFINE_string(format, options::TWO_DASHES, 'b', "elf", N_("Set input format"), ("[elf,binary]")); DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true, N_("-l searches for shared libraries"), NULL); DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0', N_("-l does not search for shared libraries"), NULL, true); DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false, N_("Bind defined symbols locally"), NULL); DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false, N_("Bind defined function symbols locally"), NULL); DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "sha1", N_("Generate build ID note"), N_("[=STYLE]")); DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true, N_("Check segment addresses for overlaps (default)"), N_("Do not check segment addresses for overlaps")); #ifdef HAVE_ZLIB_H DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none", N_("Compress .debug_* sections in the output file"), ("[none,zlib]"), {"none", "zlib"}); #else DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none", N_("Compress .debug_* sections in the output file"), N_("[none]"), {"none"}); #endif DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false, N_("Not supported"), N_("Do not copy DT_NEEDED tags from shared libraries")); DEFINE_bool(define_common, options::TWO_DASHES, 'd', false, N_("Define common symbols"), N_("Do not define common symbols")); DEFINE_bool(dc, options::ONE_DASH, '\0', false, N_("Alias for -d"), NULL); DEFINE_bool(dp, options::ONE_DASH, '\0', false, N_("Alias for -d"), NULL); DEFINE_string(debug, options::TWO_DASHES, '\0', "", N_("Turn on debugging"), N_("[all,files,script,task][,...]")); DEFINE_special(defsym, options::TWO_DASHES, '\0', N_("Define a symbol"), N_("SYMBOL=EXPRESSION")); DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL, N_("Demangle C++ symbols in log messages"), N_("[=STYLE]")); DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false, N_("Do not demangle C++ symbols in log messages"), NULL); DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false, N_("Try to detect violations of the One Definition Rule"), NULL); DEFINE_bool(discard_locals, options::TWO_DASHES, 'X', false, N_("Delete all temporary local symbols"), NULL); DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false, N_("Add data symbols to dynamic symbols"), NULL); DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false, N_("Add C++ operator new/delete to dynamic symbols"), NULL); DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false, N_("Add C++ typeinfo to dynamic symbols"), NULL); DEFINE_special(dynamic_list, options::TWO_DASHES, '\0', N_("Read a list of dynamic symbols"), N_("FILE")); DEFINE_string(entry, options::TWO_DASHES, 'e', NULL, N_("Set program start address"), N_("ADDRESS")); DEFINE_special(exclude_libs, options::TWO_DASHES, '\0', N_("Exclude libraries from automatic export"), N_(("lib,lib ..."))); DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false, N_("Export all dynamic symbols"), N_("Do not export all dynamic symbols (default)")); DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false, N_("Create exception frame header"), NULL); DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false, N_("Treat warnings as errors"), N_("Do not treat warnings as errors")); DEFINE_string(fini, options::ONE_DASH, '\0', "_fini", N_("Call SYMBOL at unload-time"), N_("SYMBOL")); DEFINE_string(soname, options::ONE_DASH, 'h', NULL, N_("Set shared library name"), N_("FILENAME")); DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0, N_("Min fraction of empty buckets in dynamic hash"), N_("FRACTION")); DEFINE_enum(hash_style, options::TWO_DASHES, '\0', "sysv", N_("Dynamic hash style"), N_("[sysv,gnu,both]"), {"sysv", "gnu", "both"}); DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL, N_("Set dynamic linker path"), N_("PROGRAM")); DEFINE_bool(incremental, options::TWO_DASHES, '\0', false, N_("Work in progress; do not use"), N_("Do a full build")); DEFINE_special(incremental_changed, options::TWO_DASHES, '\0', N_("Assume files changed"), NULL); DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0', N_("Assume files didn't change"), NULL); DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0', N_("Use timestamps to check files (default)"), NULL); DEFINE_string(init, options::ONE_DASH, '\0', "_init", N_("Call SYMBOL at load-time"), N_("SYMBOL")); DEFINE_special(just_symbols, options::TWO_DASHES, '\0', N_("Read only symbol values from FILE"), N_("FILE")); DEFINE_special(library, options::TWO_DASHES, 'l', N_("Search for library LIBNAME"), N_("LIBNAME")); DEFINE_dirlist(library_path, options::TWO_DASHES, 'L', N_("Add directory to search path"), N_("DIR")); DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "", N_("Ignored for compatibility"), N_("EMULATION")); DEFINE_bool(print_map, options::TWO_DASHES, 'M', false, N_("Write map file on standard output"), NULL); DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"), N_("MAPFILENAME")); DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false, N_("Do not page align data"), NULL); DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false, N_("Do not page align data, do not make text readonly"), N_("Page align data, make text readonly")); DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', false, N_("Enable use of DT_RUNPATH and DT_FLAGS"), N_("Disable use of DT_RUNPATH and DT_FLAGS")); DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false, N_("Create an output file even if errors occur"), NULL); DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0', N_("Report undefined symbols (even with --shared)"), NULL, false); DEFINE_string(output, options::TWO_DASHES, 'o', "a.out", N_("Set output file name"), N_("FILE")); DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0, N_("Optimize output file size"), N_("LEVEL")); DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf", N_("Set output format"), N_("[binary]")); DEFINE_bool(pie, options::ONE_DASH, '\0', false, N_("Create a position independent executable"), NULL); DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0', N_("Create a position independent executable"), NULL, false); #ifdef ENABLE_PLUGINS DEFINE_special(plugin, options::TWO_DASHES, '\0', N_("Load a plugin library"), N_("PLUGIN")); DEFINE_special(plugin_opt, options::TWO_DASHES, '\0', N_("Pass an option to the plugin"), N_("OPTION")); #endif DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false, N_("Preread archive symbols when multi-threaded"), NULL); DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL, N_("Print symbols defined and used for each input"), N_("FILENAME")); DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false, N_("Ignored for SVR4 compatibility"), NULL); DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false, N_("Generate relocations in output"), NULL); DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false, N_("Generate relocatable output"), NULL); DEFINE_bool(relax, options::TWO_DASHES, '\0', false, N_("Relax branches on certain targets"), NULL); DEFINE_string(retain_symbols_file, options::EXACTLY_ONE_DASH, '\0', NULL, N_("keep only symbols listed in this file"), N_("[file]")); // -R really means -rpath, but can mean --just-symbols for // compatibility with GNU ld. -rpath is always -rpath, so we list // it separately. DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R', N_("Add DIR to runtime search path"), N_("DIR")); DEFINE_dirlist(rpath, options::ONE_DASH, '\0', N_("Add DIR to runtime search path"), N_("DIR")); DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0', N_("Add DIR to link time shared library search path"), N_("DIR")); DEFINE_bool(strip_all, options::TWO_DASHES, 's', false, N_("Strip all symbols"), NULL); DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false, N_("Strip debugging information"), NULL); DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false, N_("Emit only debug line number information"), NULL); DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false, N_("Strip debug symbols that are unused by gdb " "(at least versions <= 6.7)"), NULL); DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true, N_("Strip LTO intermediate code sections"), NULL); DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1, N_("(ARM only) The maximum distance from instructions in a group " "of sections to their stubs. Negative values mean stubs " "are always after the group. 1 means using default size.\n"), N_("SIZE")); DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false, N_("Use less memory and more disk I/O " "(included only for compatibility with GNU ld)"), NULL); DEFINE_bool(shared, options::ONE_DASH, '\0', false, N_("Generate shared library"), NULL); DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false, N_("Generate shared library"), NULL); DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x4000, N_("Stack size when -fsplit-stack function calls non-split"), N_("SIZE")); // This is not actually special in any way, but I need to give it // a non-standard accessor-function name because 'static' is a keyword. DEFINE_special(static, options::ONE_DASH, '\0', N_("Do not link against shared libraries"), NULL); DEFINE_enum(icf, options::TWO_DASHES, '\0', "none", N_("Identical Code Folding. " "\'--icf=safe\' folds only ctors and dtors."), ("[none,all,safe]"), {"none", "all", "safe"}); DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0, N_("Number of iterations of ICF (default 2)"), N_("COUNT")); DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false, N_("List folded identical sections on stderr"), N_("Do not list folded identical sections")); DEFINE_set(keep_unique, options::TWO_DASHES, '\0', N_("Do not fold this symbol during ICF"), N_("SYMBOL")); DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false, N_("Remove unused sections"), N_("Don't remove unused sections (default)")); DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false, N_("List removed unused sections on stderr"), N_("Do not list removed unused sections")); DEFINE_bool(stats, options::TWO_DASHES, '\0', false, N_("Print resource usage statistics"), NULL); DEFINE_string(sysroot, options::TWO_DASHES, '\0', "", N_("Set target system root directory"), N_("DIR")); DEFINE_bool(trace, options::TWO_DASHES, 't', false, N_("Print the name of each input file"), NULL); DEFINE_special(script, options::TWO_DASHES, 'T', N_("Read linker script"), N_("FILE")); DEFINE_bool(threads, options::TWO_DASHES, '\0', false, N_("Run the linker multi-threaded"), N_("Do not run the linker multi-threaded")); DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0, N_("Number of threads to use"), N_("COUNT")); DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0, N_("Number of threads to use in initial pass"), N_("COUNT")); DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0, N_("Number of threads to use in middle pass"), N_("COUNT")); DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0, N_("Number of threads to use in final pass"), N_("COUNT")); DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U, N_("Set the address of the bss segment"), N_("ADDRESS")); DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U, N_("Set the address of the data segment"), N_("ADDRESS")); DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U, N_("Set the address of the text segment"), N_("ADDRESS")); DEFINE_set(undefined, options::TWO_DASHES, 'u', N_("Create undefined reference to SYMBOL"), N_("SYMBOL")); DEFINE_bool(verbose, options::TWO_DASHES, '\0', false, N_("Synonym for --debug=files"), NULL); DEFINE_special(version_script, options::TWO_DASHES, '\0', N_("Read version script"), N_("FILE")); DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false, N_("Warn about duplicate common symbols"), N_("Do not warn about duplicate common symbols (default)")); DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true, N_("Warn when skipping an incompatible library"), N_("Don't warn when skipping an incompatible library")); DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false, N_("Include all archive contents"), N_("Include only needed archive contents")); DEFINE_set(wrap, options::TWO_DASHES, '\0', N_("Use wrapper functions for SYMBOL"), N_("SYMBOL")); DEFINE_set(trace_symbol, options::TWO_DASHES, 'y', N_("Trace references to symbol"), N_("SYMBOL")); DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "", N_("Default search path for Solaris compatibility"), N_("PATH")); DEFINE_special(start_group, options::TWO_DASHES, '(', N_("Start a library search group"), NULL); DEFINE_special(end_group, options::TWO_DASHES, ')', N_("End a library search group"), NULL); // The -z options. DEFINE_bool(combreloc, options::DASH_Z, '\0', true, N_("Sort dynamic relocs"), N_("Do not sort dynamic relocs")); DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0, N_("Set common page size to SIZE"), N_("SIZE")); DEFINE_bool(defs, options::DASH_Z, '\0', false, N_("Report undefined symbols (even with --shared)"), NULL); DEFINE_bool(execstack, options::DASH_Z, '\0', false, N_("Mark output as requiring executable stack"), NULL); DEFINE_bool(initfirst, options::DASH_Z, '\0', false, N_("Mark DSO to be initialized first at runtime"), NULL); DEFINE_bool(interpose, options::DASH_Z, '\0', false, N_("Mark object to interpose all DSOs but executable"), NULL); DEFINE_bool(lazy, options::DASH_Z, '\0', false, N_("Mark object for lazy runtime binding (default)"), NULL); DEFINE_bool(loadfltr, options::DASH_Z, '\0', false, N_("Mark object requiring immediate process"), NULL); DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0, N_("Set maximum page size to SIZE"), N_("SIZE")); DEFINE_bool(copyreloc, options::DASH_Z, '\0', true, NULL, N_("Do not create copy relocs")); DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false, N_("Mark object not to use default search paths"), NULL); DEFINE_bool(nodelete, options::DASH_Z, '\0', false, N_("Mark DSO non-deletable at runtime"), NULL); DEFINE_bool(nodlopen, options::DASH_Z, '\0', false, N_("Mark DSO not available to dlopen"), NULL); DEFINE_bool(nodump, options::DASH_Z, '\0', false, N_("Mark DSO not available to dldump"), NULL); DEFINE_bool(noexecstack, options::DASH_Z, '\0', false, N_("Mark output as not requiring executable stack"), NULL); DEFINE_bool(now, options::DASH_Z, '\0', false, N_("Mark object for immediate function binding"), NULL); DEFINE_bool(origin, options::DASH_Z, '\0', false, N_("Mark DSO to indicate that needs immediate $ORIGIN " "processing at runtime"), NULL); DEFINE_bool(relro, options::DASH_Z, '\0', false, N_("Where possible mark variables read-only after relocation"), N_("Don't mark variables read-only after relocation")); public: typedef options::Dir_list Dir_list; General_options(); // Does post-processing on flags, making sure they all have // non-conflicting values. Also converts some flags from their // "standard" types (string, etc), to another type (enum, DirList), // which can be accessed via a separate method. Dies if it notices // any problems. void finalize(); // True if we printed the version information. bool printed_version() const { return this->printed_version_; } // The macro defines output() (based on --output), but that's a // generic name. Provide this alternative name, which is clearer. const char* output_file_name() const { return this->output(); } // This is not defined via a flag, but combines flags to say whether // the output is position-independent or not. bool output_is_position_independent() const { return this->shared() || this->pie(); } // Return true if the output is something that can be exec()ed, such // as a static executable, or a position-dependent or // position-independent executable, but not a dynamic library or an // object file. bool output_is_executable() const { return !this->shared() && !this->relocatable(); } // This would normally be static(), and defined automatically, but // since static is a keyword, we need to come up with our own name. bool is_static() const { return static_; } // In addition to getting the input and output formats as a string // (via format() and oformat()), we also give access as an enum. enum Object_format { // Ordinary ELF. OBJECT_FORMAT_ELF, // Straight binary format. OBJECT_FORMAT_BINARY }; // Convert a string to an Object_format. Gives an error if the // string is not recognized. static Object_format string_to_object_format(const char* arg); // Note: these functions are not very fast. Object_format format_enum() const; Object_format oformat_enum() const; // Return whether FILENAME is in a system directory. bool is_in_system_directory(const std::string& name) const; // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_. bool should_retain_symbol(const char* symbol_name) const { if (symbols_to_retain_.empty()) // means flag wasn't specified return true; return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end(); } // These are the best way to get access to the execstack state, // not execstack() and noexecstack() which are hard to use properly. bool is_execstack_set() const { return this->execstack_status_ != EXECSTACK_FROM_INPUT; } bool is_stack_executable() const { return this->execstack_status_ == EXECSTACK_YES; } bool icf_enabled() const { return this->icf_status_ != ICF_NONE; } bool icf_safe_folding() const { return this->icf_status_ == ICF_SAFE; } // The --demangle option takes an optional string, and there is also // a --no-demangle option. This is the best way to decide whether // to demangle or not. bool do_demangle() const { return this->do_demangle_; } // Returns TRUE if any plugin libraries have been loaded. bool has_plugins() const { return this->plugins_ != NULL; } // Return a pointer to the plugin manager. Plugin_manager* plugins() const { return this->plugins_; } // True iff SYMBOL was found in the file specified by dynamic-list. bool in_dynamic_list(const char* symbol) const { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); } // The disposition given by the --incremental-changed, // --incremental-unchanged or --incremental-unknown option. The // value may change as we proceed parsing the command line flags. Incremental_disposition incremental_disposition() const { return this->incremental_disposition_; } // Return true if S is the name of a library excluded from automatic // symbol export. bool check_excluded_libs (const std::string &s) const; private: // Don't copy this structure. General_options(const General_options&); General_options& operator=(const General_options&); // Whether to mark the stack as executable. enum Execstack { // Not set on command line. EXECSTACK_FROM_INPUT, // Mark the stack as executable (-z execstack). EXECSTACK_YES, // Mark the stack as not executable (-z noexecstack). EXECSTACK_NO }; enum Icf_status { // Do not fold any functions (Default or --icf=none). ICF_NONE, // All functions are candidates for folding. (--icf=all). ICF_ALL, // Only ctors and dtors are candidates for folding. (--icf=safe). ICF_SAFE }; void set_icf_status(Icf_status value) { this->icf_status_ = value; } void set_execstack_status(Execstack value) { this->execstack_status_ = value; } void set_do_demangle(bool value) { this->do_demangle_ = value; } void set_static(bool value) { static_ = value; } // These are called by finalize() to set up the search-path correctly. void add_to_library_path_with_sysroot(const char* arg) { this->add_search_directory_to_library_path(Search_directory(arg, true)); } // Apply any sysroot to the directory lists. void add_sysroot(); // Add a plugin and its arguments to the list of plugins. void add_plugin(const char *filename); // Add a plugin option. void add_plugin_option(const char* opt); // Whether we printed version information. bool printed_version_; // Whether to mark the stack as executable. Execstack execstack_status_; // Whether to do code folding. Icf_status icf_status_; // Whether to do a static link. bool static_; // Whether to do demangling. bool do_demangle_; // List of plugin libraries. Plugin_manager* plugins_; // The parsed output of --dynamic-list files. For convenience in // script.cc, we store this as a Script_options object, even though // we only use a single Version_tree from it. Script_options dynamic_list_; // The disposition given by the --incremental-changed, // --incremental-unchanged or --incremental-unknown option. The // value may change as we proceed parsing the command line flags. Incremental_disposition incremental_disposition_; // Whether we have seen one of the options that require incremental // build (--incremental-changed, --incremental-unchanged or // --incremental-unknown) bool implicit_incremental_; // Libraries excluded from automatic export, via --exclude-libs. Unordered_set<std::string> excluded_libs_; // List of symbol-names to keep, via -retain-symbol-info. Unordered_set<std::string> symbols_to_retain_; }; // The position-dependent options. We use this to store the state of // the commandline at a particular point in parsing for later // reference. For instance, if we see "ld --whole-archive foo.a // --no-whole-archive," we want to store the whole-archive option with // foo.a, so when the time comes to parse foo.a we know we should do // it in whole-archive mode. We could store all of General_options, // but that's big, so we just pick the subset of flags that actually // change in a position-dependent way. #define DEFINE_posdep(varname__, type__) \ public: \ type__ \ varname__() const \ { return this->varname__##_; } \ \ void \ set_##varname__(type__ value) \ { this->varname__##_ = value; } \ private: \ type__ varname__##_ class Position_dependent_options { public: Position_dependent_options(const General_options& options = Position_dependent_options::default_options_) { copy_from_options(options); } void copy_from_options(const General_options& options) { this->set_as_needed(options.as_needed()); this->set_Bdynamic(options.Bdynamic()); this->set_format_enum(options.format_enum()); this->set_whole_archive(options.whole_archive()); this->set_incremental_disposition(options.incremental_disposition()); } DEFINE_posdep(as_needed, bool); DEFINE_posdep(Bdynamic, bool); DEFINE_posdep(format_enum, General_options::Object_format); DEFINE_posdep(whole_archive, bool); DEFINE_posdep(incremental_disposition, Incremental_disposition); private: // This is a General_options with everything set to its default // value. A Position_dependent_options created with no argument // will take its values from here. static General_options default_options_; }; // A single file or library argument from the command line. class Input_file_argument { public: enum Input_file_type { // A regular file, name used as-is, not searched. INPUT_FILE_TYPE_FILE, // A library name. When used, "lib" will be prepended and ".so" or // ".a" appended to make a filename, and that filename will be searched // for using the -L paths. INPUT_FILE_TYPE_LIBRARY, // A regular file, name used as-is, but searched using the -L paths. INPUT_FILE_TYPE_SEARCHED_FILE }; // name: file name or library name // type: the type of this input file. // extra_search_path: an extra directory to look for the file, prior // to checking the normal library search path. If this is "", // then no extra directory is added. // just_symbols: whether this file only defines symbols. // options: The position dependent options at this point in the // command line, such as --whole-archive. Input_file_argument() : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""), just_symbols_(false), options_() { } Input_file_argument(const char* name, Input_file_type type, const char* extra_search_path, bool just_symbols, const Position_dependent_options& options) : name_(name), type_(type), extra_search_path_(extra_search_path), just_symbols_(just_symbols), options_(options) { } // You can also pass in a General_options instance instead of a // Position_dependent_options. In that case, we extract the // position-independent vars from the General_options and only store // those. Input_file_argument(const char* name, Input_file_type type, const char* extra_search_path, bool just_symbols, const General_options& options) : name_(name), type_(type), extra_search_path_(extra_search_path), just_symbols_(just_symbols), options_(options) { } const char* name() const { return this->name_.c_str(); } const Position_dependent_options& options() const { return this->options_; } bool is_lib() const { return type_ == INPUT_FILE_TYPE_LIBRARY; } bool is_searched_file() const { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; } const char* extra_search_path() const { return (this->extra_search_path_.empty() ? NULL : this->extra_search_path_.c_str()); } // Return whether we should only read symbols from this file. bool just_symbols() const { return this->just_symbols_; } // Return whether this file may require a search using the -L // options. bool may_need_search() const { return (this->is_lib() || this->is_searched_file() || !this->extra_search_path_.empty()); } private: // We use std::string, not const char*, here for convenience when // using script files, so that we do not have to preserve the string // in that case. std::string name_; Input_file_type type_; std::string extra_search_path_; bool just_symbols_; Position_dependent_options options_; }; // A file or library, or a group, from the command line. class Input_argument { public: // Create a file or library argument. explicit Input_argument(Input_file_argument file) : is_file_(true), file_(file), group_(NULL) { } // Create a group argument. explicit Input_argument(Input_file_group* group) : is_file_(false), group_(group) { } // Return whether this is a file. bool is_file() const { return this->is_file_; } // Return whether this is a group. bool is_group() const { return !this->is_file_; } // Return the information about the file. const Input_file_argument& file() const { gold_assert(this->is_file_); return this->file_; } // Return the information about the group. const Input_file_group* group() const { gold_assert(!this->is_file_); return this->group_; } Input_file_group* group() { gold_assert(!this->is_file_); return this->group_; } private: bool is_file_; Input_file_argument file_; Input_file_group* group_; }; typedef std::vector<Input_argument> Input_argument_list; // A group from the command line. This is a set of arguments within // --start-group ... --end-group. class Input_file_group { public: typedef Input_argument_list::const_iterator const_iterator; Input_file_group() : files_() { } // Add a file to the end of the group. void add_file(const Input_file_argument& arg) { this->files_.push_back(Input_argument(arg)); } // Iterators to iterate over the group contents. const_iterator begin() const { return this->files_.begin(); } const_iterator end() const { return this->files_.end(); } private: Input_argument_list files_; }; // A list of files from the command line or a script. class Input_arguments { public: typedef Input_argument_list::const_iterator const_iterator; Input_arguments() : input_argument_list_(), in_group_(false) { } // Add a file. void add_file(const Input_file_argument& arg); // Start a group (the --start-group option). void start_group(); // End a group (the --end-group option). void end_group(); // Return whether we are currently in a group. bool in_group() const { return this->in_group_; } // The number of entries in the list. int size() const { return this->input_argument_list_.size(); } // Iterators to iterate over the list of input files. const_iterator begin() const { return this->input_argument_list_.begin(); } const_iterator end() const { return this->input_argument_list_.end(); } // Return whether the list is empty. bool empty() const { return this->input_argument_list_.empty(); } private: Input_argument_list input_argument_list_; bool in_group_; }; // All the information read from the command line. These are held in // three separate structs: one to hold the options (--foo), one to // hold the filenames listed on the commandline, and one to hold // linker script information. This third is not a subset of the other // two because linker scripts can be specified either as options (via // -T) or as a file. class Command_line { public: typedef Input_arguments::const_iterator const_iterator; Command_line(); // Process the command line options. This will exit with an // appropriate error message if an unrecognized option is seen. void process(int argc, const char** argv); // Process one command-line option. This takes the index of argv to // process, and returns the index for the next option. no_more_options // is set to true if argv[i] is "--". int process_one_option(int argc, const char** argv, int i, bool* no_more_options); // Get the general options. const General_options& options() const { return this->options_; } // Get the position dependent options. const Position_dependent_options& position_dependent_options() const { return this->position_options_; } // Get the linker-script options. Script_options& script_options() { return this->script_options_; } // Get the version-script options: a convenience routine. const Version_script_info& version_script() const { return *this->script_options_.version_script_info(); } // Get the input files. Input_arguments& inputs() { return this->inputs_; } // The number of input files. int number_of_input_files() const { return this->inputs_.size(); } // Iterators to iterate over the list of input files. const_iterator begin() const { return this->inputs_.begin(); } const_iterator end() const { return this->inputs_.end(); } private: Command_line(const Command_line&); Command_line& operator=(const Command_line&); // This is a dummy class to provide a constructor that runs before // the constructor for the General_options. The Pre_options constructor // is used as a hook to set the flag enabling the options to register // themselves. struct Pre_options { Pre_options(); }; // This must come before options_! Pre_options pre_options_; General_options options_; Position_dependent_options position_options_; Script_options script_options_; Input_arguments inputs_; }; } // End namespace gold. #endif // !defined(GOLD_OPTIONS_H)
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