1 // options.h -- handle command line options for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
24 // Holds everything we get from the command line.
25 // General_options (from Command_line::options())
26 // Options which are not position dependent.
27 // Input_argument (from Command_line::inputs())
28 // The list of input files, including -l options.
29 // Position_dependent_options (from Input_argument::options())
30 // Position dependent options which apply to this argument.
32 #ifndef GOLD_OPTIONS_H
33 #define GOLD_OPTIONS_H
47 class Input_file_group;
48 class Position_dependent_options;
54 class Command_line_options;
57 struct One_debug_option;
59 } // End namespace gold::options.
61 // A directory to search. For each directory we record whether it is
62 // in the sysroot. We need to know this so that, if a linker script
63 // is found within the sysroot, we will apply the sysroot to any files
64 // named by that script.
66 class Search_directory
69 // We need a default constructor because we put this in a
72 : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
75 // This is the usual constructor.
76 Search_directory(const char* name, bool put_in_sysroot)
77 : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
79 if (this->name_.empty())
83 // This is called if we have a sysroot. The sysroot is prefixed to
84 // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is
85 // set to true for any enries which are in the sysroot (this will
86 // naturally include any entries for which put_in_sysroot_ is true).
87 // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
88 // passing SYSROOT to lrealpath.
90 add_sysroot(const char* sysroot, const char* canonical_sysroot);
92 // Get the directory name.
95 { return this->name_; }
97 // Return whether this directory is in the sysroot.
100 { return this->is_in_sysroot_; }
104 bool put_in_sysroot_;
108 // The position independent options which apply to the whole link.
109 // There are a lot of them.
111 class General_options
118 // Straight binary format.
124 // -d: define common symbols.
126 define_common() const
127 { return this->define_common_; }
129 // -e: set entry address.
132 { return this->entry_; }
134 // -E: export dynamic symbols.
136 export_dynamic() const
137 { return this->export_dynamic_; }
139 // -h: shared library name.
142 { return this->soname_; }
144 // -I: dynamic linker name.
146 dynamic_linker() const
147 { return this->dynamic_linker_; }
149 // -L: Library search path.
150 typedef std::vector<Search_directory> Dir_list;
154 { return this->search_path_; }
156 // -O: optimization level (0: don't try to optimize output size).
159 { return this->optimization_level_; }
161 // -o: Output file name.
163 output_file_name() const
164 { return this->output_file_name_; }
166 // --oformat: Output format.
169 { return this->oformat_; }
173 { return this->oformat_string_; }
175 // Return the default target.
177 default_target() const;
179 // -q: Whether to emit relocations.
182 { return this->emit_relocs_; }
184 // -r: Whether we are doing a relocatable link.
187 { return this->is_relocatable_; }
189 // -s: Strip all symbols.
192 { return this->strip_ == STRIP_ALL; }
194 // -S: Strip debugging information.
197 { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
199 // --strip-debug-gdb: strip only debugging information that's not
200 // used by gdb (at least, for gdb versions <= 6.7).
202 strip_debug_gdb() const
203 { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
205 // --allow-shlib-undefined: do not warn about unresolved symbols in
206 // --shared libraries.
208 allow_shlib_undefined() const
209 { return this->allow_shlib_undefined_; }
211 // -Bsymbolic: bind defined symbols locally.
214 { return this->symbolic_; }
216 // --compress-debug-sections: compress .debug_* sections in the
217 // output file using the given compression method. This is useful
218 // when the tools (such as gdb) support compressed sections.
220 compress_debug_sections() const
221 { return this->compress_debug_sections_ != NO_COMPRESSION; }
224 zlib_compress_debug_sections() const
225 { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
227 // --demangle: demangle C++ symbols in our log messages.
230 { return this->demangle_; }
232 // --detect-odr-violations: Whether to search for One Defn Rule violations.
234 detect_odr_violations() const
235 { return this->detect_odr_violations_; }
237 // --eh-frame-hdr: Whether to generate an exception frame header.
240 { return this->create_eh_frame_hdr_; }
242 // --rpath: The runtime search path.
245 { return this->rpath_; }
247 // --rpath-link: The link time search patch for shared libraries.
250 { return this->rpath_link_; }
252 // --shared: Whether generating a shared object.
255 { return this->is_shared_; }
257 // This is not defined via a flag, but combines flags to say whether
258 // the output is position-independent or not.
260 output_is_position_independent() const
261 { return this->shared(); }
263 // --static: Whether doing a static link.
266 { return this->is_static_; }
268 // --stats: Print resource usage statistics.
271 { return this->print_stats_; }
273 // --sysroot: The system root of a cross-linker.
276 { return this->sysroot_; }
278 // -Tbss: The address of the BSS segment
281 { return this->bss_segment_address_; }
283 // Whether -Tbss was used.
285 user_set_Tbss() const
286 { return this->bss_segment_address_ != -1U; }
288 // -Tdata: The address of the data segment
291 { return this->data_segment_address_; }
293 // Whether -Tdata was used.
295 user_set_Tdata() const
296 { return this->data_segment_address_ != -1U; }
298 // -Ttext: The address of the .text section
301 { return this->text_segment_address_; }
303 // Whether -Ttext was used.
305 user_set_Ttext() const
306 { return this->text_segment_address_ != -1U; }
308 // --threads: Whether to use threads.
311 { return this->threads_; }
313 // --thread-count-initial: Threads to use in initial pass.
315 thread_count_initial() const
316 { return this->thread_count_initial_; }
318 // --thread-count-middle: Threads to use in middle pass.
320 thread_count_middle() const
321 { return this->thread_count_middle_; }
323 // --thread-count-final: Threads to use in final pass.
325 thread_count_final() const
326 { return this->thread_count_final_; }
328 // -z execstack, -z noexecstack
330 is_execstack_set() const
331 { return this->execstack_ != EXECSTACK_FROM_INPUT; }
334 is_stack_executable() const
335 { return this->execstack_ == EXECSTACK_YES; }
339 max_page_size() const
340 { return this->max_page_size_; }
342 // -z common-page-size
344 common_page_size() const
345 { return this->common_page_size_; }
350 { return this->debug_; }
353 // Don't copy this structure.
354 General_options(const General_options&);
355 General_options& operator=(const General_options&);
357 friend class Command_line;
358 friend class options::Command_line_options;
360 // Which symbols to strip.
363 // Don't strip any symbols.
365 // Strip all symbols.
367 // Strip debugging information.
369 // Strip debugging information that's not used by gdb (at least <= 6.7)
370 STRIP_DEBUG_UNUSED_BY_GDB
373 // Whether to mark the stack as executable.
376 // Not set on command line.
377 EXECSTACK_FROM_INPUT,
378 // Mark the stack as executable.
380 // Mark the stack as not executable.
384 // What compression method to use
385 enum CompressionMethod
392 set_define_common(bool value)
394 this->define_common_ = value;
395 this->user_set_define_common_ = true;
399 set_no_define_common(bool value)
400 { this->set_define_common(!value); }
403 user_set_define_common() const
404 { return this->user_set_define_common_; }
407 set_entry(const char* arg)
408 { this->entry_ = arg; }
411 set_export_dynamic(bool value)
412 { this->export_dynamic_ = value; }
415 set_soname(const char* arg)
416 { this->soname_ = arg; }
419 set_dynamic_linker(const char* arg)
420 { this->dynamic_linker_ = arg; }
423 add_to_search_path(const char* arg)
424 { this->search_path_.push_back(Search_directory(arg, false)); }
427 add_to_search_path_with_sysroot(const char* arg)
428 { this->search_path_.push_back(Search_directory(arg, true)); }
431 set_optimize(const char* arg)
434 this->optimization_level_ = strtol(arg, &endptr, 0);
435 if (*endptr != '\0' || this->optimization_level_ < 0)
436 gold_fatal(_("invalid optimization level: %s"), arg);
440 set_output(const char* arg)
441 { this->output_file_name_ = arg; }
444 set_oformat(const char*);
447 set_emit_relocs(bool value)
448 { this->emit_relocs_ = value; }
451 set_relocatable(bool value)
452 { this->is_relocatable_ = value; }
456 { this->strip_ = STRIP_ALL; }
458 // Note: normalize_options() depends on the fact that this turns off
459 // STRIP_ALL if it were already set.
461 set_strip_debug(bool)
462 { this->strip_ = STRIP_DEBUG; }
465 set_strip_debug_gdb(bool)
466 { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
469 set_allow_shlib_undefined(bool value)
470 { this->allow_shlib_undefined_ = value; }
473 set_no_allow_shlib_undefined(bool value)
474 { this->set_allow_shlib_undefined(!value); }
477 set_Bsymbolic(bool value)
478 { this->symbolic_ = value; }
480 void set_compress_debug_sections(const char* arg)
482 if (strcmp(arg, "none") == 0)
483 this->compress_debug_sections_ = NO_COMPRESSION;
485 else if (strcmp(arg, "zlib") == 0)
486 this->compress_debug_sections_ = ZLIB_COMPRESSION;
489 gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
494 add_to_defsym(const char* arg);
497 set_demangle(bool value)
498 { this->demangle_ = value; }
501 set_no_demangle(bool value)
502 { this->set_demangle(!value); }
505 set_detect_odr_violations(bool value)
506 { this->detect_odr_violations_ = value; }
509 set_eh_frame_hdr(bool value)
510 { this->create_eh_frame_hdr_ = value; }
513 add_to_rpath(const char* arg)
514 { this->rpath_.push_back(Search_directory(arg, false)); }
517 add_to_rpath_link(const char* arg)
518 { this->rpath_link_.push_back(Search_directory(arg, false)); }
521 set_shared(bool value)
522 { this->is_shared_ = value; }
525 set_static(bool value)
526 { this->is_static_ = value; }
529 set_stats(bool value)
530 { this->print_stats_ = value; }
533 set_sysroot(const char* arg)
534 { this->sysroot_ = arg; }
537 set_segment_address(const char* name, const char* arg, uint64_t* val)
540 *val = strtoull(arg, &endptr, 0);
541 if (*endptr != '\0' || *val == -1U)
542 gold_fatal(_("invalid argument to %s: %s"), name, arg);
546 set_Tbss(const char* arg)
547 { this->set_segment_address("-Tbss", arg, &this->bss_segment_address_); }
550 set_Tdata(const char* arg)
551 { this->set_segment_address("-Tdata", arg, &this->data_segment_address_); }
554 set_Ttext(const char* arg)
555 { this->set_segment_address("-Ttext", arg, &this->text_segment_address_); }
558 parse_thread_count(const char* arg)
561 const int count = strtol(arg, &endptr, 0);
562 if (*endptr != '\0' || count < 0)
563 gold_fatal(_("invalid thread count: %s"), arg);
568 set_threads(bool value)
570 #ifndef ENABLE_THREADS
572 gold_fatal(_("--threads not supported"));
574 this->threads_ = value;
578 set_no_threads(bool value)
579 { this->set_threads(!value); }
582 set_thread_count(const char* arg)
584 int count = this->parse_thread_count(arg);
585 this->thread_count_initial_ = count;
586 this->thread_count_middle_ = count;
587 this->thread_count_final_ = count;
591 set_thread_count_initial(const char* arg)
592 { this->thread_count_initial_ = this->parse_thread_count(arg); }
595 set_thread_count_middle(const char* arg)
596 { this->thread_count_middle_ = this->parse_thread_count(arg); }
599 set_thread_count_final(const char* arg)
600 { this->thread_count_final_ = this->parse_thread_count(arg); }
608 { this->execstack_ = EXECSTACK_YES; }
611 set_noexecstack(bool)
612 { this->execstack_ = EXECSTACK_NO; }
615 set_max_page_size(const char* arg)
618 this->max_page_size_ = strtoull(arg, &endptr, 0);
619 if (*endptr != '\0' || this->max_page_size_ == 0)
620 gold_fatal(_("invalid max-page-size: %s"), arg);
624 set_common_page_size(const char* arg)
627 this->common_page_size_ = strtoull(arg, &endptr, 0);
628 if (*endptr != '\0' || this->common_page_size_ == 0)
629 gold_fatal(_("invalid common-page-size: %s"), arg);
633 set_debug(unsigned int flags)
634 { this->debug_ = flags; }
636 // Handle the -z option.
638 handle_z_option(const char*);
640 // Handle the --debug option.
642 handle_debug_option(const char*);
644 // Apply any sysroot to the directory lists.
649 bool user_set_define_common_;
651 bool export_dynamic_;
653 const char* dynamic_linker_;
654 Dir_list search_path_;
655 int optimization_level_;
656 const char* output_file_name_;
657 Object_format oformat_;
658 const char* oformat_string_;
660 bool is_relocatable_;
662 bool allow_shlib_undefined_;
664 CompressionMethod compress_debug_sections_;
666 bool detect_odr_violations_;
667 bool create_eh_frame_hdr_;
669 Dir_list rpath_link_;
673 std::string sysroot_;
674 uint64_t bss_segment_address_;
675 uint64_t data_segment_address_;
676 uint64_t text_segment_address_;
678 int thread_count_initial_;
679 int thread_count_middle_;
680 int thread_count_final_;
681 Execstack execstack_;
682 uint64_t max_page_size_;
683 uint64_t common_page_size_;
687 // The current state of the position dependent options.
689 class Position_dependent_options
692 typedef General_options::Object_format Object_format;
694 Position_dependent_options();
696 // -Bdynamic/-Bstatic: Whether we are searching for a static archive
697 // -rather than a shared object.
700 { return !this->do_static_search_; }
702 // --as-needed: Whether to add a DT_NEEDED argument only if the
703 // dynamic object is used.
706 { return this->as_needed_; }
708 // --whole-archive: Whether to include the entire contents of an
711 whole_archive() const
712 { return this->include_whole_archive_; }
714 // --format: The format of the input file.
717 { return this->input_format_; }
720 set_Bstatic(bool value)
721 { this->do_static_search_ = value; }
724 set_Bdynamic(bool value)
725 { this->set_Bstatic(!value); }
728 set_as_needed(bool value)
729 { this->as_needed_ = value; }
732 set_no_as_needed(bool value)
733 { this->set_as_needed(!value); }
736 set_whole_archive(bool value)
737 { this->include_whole_archive_ = value; }
740 set_no_whole_archive(bool value)
741 { this->set_whole_archive(!value); }
744 set_format(const char*);
747 set_format_enum(Object_format value)
748 { this->input_format_ = value; }
751 bool do_static_search_;
753 bool include_whole_archive_;
754 Object_format input_format_;
757 // A single file or library argument from the command line.
759 class Input_file_argument
762 // name: file name or library name
763 // is_lib: true if name is a library name: that is, emits the leading
764 // "lib" and trailing ".so"/".a" from the name
765 // extra_search_path: an extra directory to look for the file, prior
766 // to checking the normal library search path. If this is "",
767 // then no extra directory is added.
768 // just_symbols: whether this file only defines symbols.
769 // options: The position dependent options at this point in the
770 // command line, such as --whole-archive.
771 Input_file_argument()
772 : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
776 Input_file_argument(const char* name, bool is_lib,
777 const char* extra_search_path,
779 const Position_dependent_options& options)
780 : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
781 just_symbols_(just_symbols), options_(options)
786 { return this->name_.c_str(); }
788 const Position_dependent_options&
790 { return this->options_; }
794 { return this->is_lib_; }
797 extra_search_path() const
799 return (this->extra_search_path_.empty()
801 : this->extra_search_path_.c_str());
804 // Return whether we should only read symbols from this file.
807 { return this->just_symbols_; }
809 // Return whether this file may require a search using the -L
812 may_need_search() const
813 { return this->is_lib_ || !this->extra_search_path_.empty(); }
816 // We use std::string, not const char*, here for convenience when
817 // using script files, so that we do not have to preserve the string
821 std::string extra_search_path_;
823 Position_dependent_options options_;
826 // A file or library, or a group, from the command line.
831 // Create a file or library argument.
832 explicit Input_argument(Input_file_argument file)
833 : is_file_(true), file_(file), group_(NULL)
836 // Create a group argument.
837 explicit Input_argument(Input_file_group* group)
838 : is_file_(false), group_(group)
841 // Return whether this is a file.
844 { return this->is_file_; }
846 // Return whether this is a group.
849 { return !this->is_file_; }
851 // Return the information about the file.
852 const Input_file_argument&
855 gold_assert(this->is_file_);
859 // Return the information about the group.
860 const Input_file_group*
863 gold_assert(!this->is_file_);
870 gold_assert(!this->is_file_);
876 Input_file_argument file_;
877 Input_file_group* group_;
880 // A group from the command line. This is a set of arguments within
881 // --start-group ... --end-group.
883 class Input_file_group
886 typedef std::vector<Input_argument> Files;
887 typedef Files::const_iterator const_iterator;
893 // Add a file to the end of the group.
895 add_file(const Input_file_argument& arg)
896 { this->files_.push_back(Input_argument(arg)); }
898 // Iterators to iterate over the group contents.
902 { return this->files_.begin(); }
906 { return this->files_.end(); }
912 // A list of files from the command line or a script.
914 class Input_arguments
917 typedef std::vector<Input_argument> Input_argument_list;
918 typedef Input_argument_list::const_iterator const_iterator;
921 : input_argument_list_(), in_group_(false)
926 add_file(const Input_file_argument& arg);
928 // Start a group (the --start-group option).
932 // End a group (the --end-group option).
936 // Return whether we are currently in a group.
939 { return this->in_group_; }
941 // The number of entries in the list.
944 { return this->input_argument_list_.size(); }
946 // Iterators to iterate over the list of input files.
950 { return this->input_argument_list_.begin(); }
954 { return this->input_argument_list_.end(); }
956 // Return whether the list is empty.
959 { return this->input_argument_list_.empty(); }
962 Input_argument_list input_argument_list_;
966 // All the information read from the command line.
971 typedef Input_arguments::const_iterator const_iterator;
975 // Process the command line options. This will exit with an
976 // appropriate error message if an unrecognized option is seen.
978 process(int argc, char** argv);
980 // Process one command-line option. This takes the index of argv to
981 // process, and returns the index for the next option.
983 process_one_option(int argc, char** argv, int i, bool* no_more_options);
985 // Handle a -l option.
987 process_l_option(int, char**, char*, bool);
989 // Handle a -R option when it means --rpath.
991 add_to_rpath(const char* arg)
992 { this->options_.add_to_rpath(arg); }
994 // Add a file for which we just read the symbols.
996 add_just_symbols_file(const char* arg)
998 this->inputs_.add_file(Input_file_argument(arg, false, "", true,
999 this->position_options_));
1002 // Handle a --start-group option.
1004 start_group(const char* arg);
1006 // Handle a --end-group option.
1008 end_group(const char* arg);
1010 // Get an option argument--a helper function for special processing.
1012 get_special_argument(const char* longname, int argc, char** argv,
1013 const char* arg, bool long_option,
1016 // Get the general options.
1017 const General_options&
1019 { return this->options_; }
1021 // Get the position dependent options.
1022 const Position_dependent_options&
1023 position_dependent_options() const
1024 { return this->position_options_; }
1026 // Get the linker-script options.
1029 { return this->script_options_; }
1031 // Get the version-script options: a convenience routine.
1032 const Version_script_info&
1033 version_script() const
1034 { return *this->script_options_.version_script_info(); }
1036 // The number of input files.
1038 number_of_input_files() const
1039 { return this->inputs_.size(); }
1041 // Iterators to iterate over the list of input files.
1045 { return this->inputs_.begin(); }
1049 { return this->inputs_.end(); }
1052 Command_line(const Command_line&);
1053 Command_line& operator=(const Command_line&);
1055 // Report usage error.
1057 usage() ATTRIBUTE_NORETURN;
1059 usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
1061 usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
1063 // Apply a command line option.
1065 apply_option(const gold::options::One_option&, const char*);
1069 add_file(const char* name, bool is_lib);
1071 // Examine the result of processing the command-line, and verify
1072 // the flags do not contradict each other or are otherwise illegal.
1074 normalize_options();
1076 General_options options_;
1077 Position_dependent_options position_options_;
1078 Script_options script_options_;
1079 Input_arguments inputs_;
1082 } // End namespace gold.
1084 #endif // !defined(GOLD_OPTIONS_H)