1 // options.h -- handle command line options for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
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.
122 General_options(Script_options*);
124 // -e: set entry address.
127 { return this->script_options_->entry(); }
129 // -E: export dynamic symbols.
131 export_dynamic() const
132 { return this->export_dynamic_; }
134 // -h: shared library name.
137 { return this->soname_; }
139 // -I: dynamic linker name.
141 dynamic_linker() const
142 { return this->dynamic_linker_; }
144 // -L: Library search path.
145 typedef std::vector<Search_directory> Dir_list;
149 { return this->search_path_; }
151 // -O: optimization level (0: don't try to optimize output size).
154 { return this->optimization_level_; }
156 // -o: Output file name.
158 output_file_name() const
159 { return this->output_file_name_; }
161 // --oformat: Output format.
164 { return this->oformat_; }
166 // Return the default target.
168 default_target() const;
170 // -r: Whether we are doing a relocatable link.
173 { return this->is_relocatable_; }
175 // -s: Strip all symbols.
178 { return this->strip_ == STRIP_ALL; }
180 // -S: Strip debugging information.
183 { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
185 // --strip-debug-gdb: strip only debugging information that's not
186 // used by gdb (at least, for gdb versions <= 6.7).
188 strip_debug_gdb() const
189 { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
191 // --allow-shlib-undefined: do not warn about unresolved symbols in
192 // --shared libraries.
194 allow_shlib_undefined() const
195 { return this->allow_shlib_undefined_; }
197 // -Bsymbolic: bind defined symbols locally.
200 { return this->symbolic_; }
202 // --compress-debug-sections: compress .debug_* sections in the
203 // output file using the given compression method. This is useful
204 // when the tools (such as gdb) support compressed sections.
206 compress_debug_sections() const
207 { return this->compress_debug_sections_ != NO_COMPRESSION; }
210 zlib_compress_debug_sections() const
211 { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
213 // --demangle: demangle C++ symbols in our log messages.
216 { return this->demangle_; }
218 // --detect-odr-violations: Whether to search for One Defn Rule violations.
220 detect_odr_violations() const
221 { return this->detect_odr_violations_; }
223 // --eh-frame-hdr: Whether to generate an exception frame header.
226 { return this->create_eh_frame_hdr_; }
228 // --rpath: The runtime search path.
231 { return this->rpath_; }
233 // --rpath-link: The link time search patch for shared libraries.
236 { return this->rpath_link_; }
238 // --shared: Whether generating a shared object.
241 { return this->is_shared_; }
243 // --static: Whether doing a static link.
246 { return this->is_static_; }
248 // --stats: Print resource usage statistics.
251 { return this->print_stats_; }
253 // --sysroot: The system root of a cross-linker.
256 { return this->sysroot_; }
258 // --version-script: The version script to apply if --shared is true.
259 const Version_script_info&
260 version_script() const
261 { return *this->script_options_->version_script_info(); }
263 // -Tbss: The address of the BSS segment
266 { return this->bss_segment_address_; }
268 // Whether -Tbss was used.
270 user_set_Tbss() const
271 { return this->bss_segment_address_ != -1U; }
273 // -Tdata: The address of the data segment
276 { return this->data_segment_address_; }
278 // Whether -Tdata was used.
280 user_set_Tdata() const
281 { return this->data_segment_address_ != -1U; }
283 // -Ttext: The address of the .text section
286 { return this->text_segment_address_; }
288 // Whether -Ttext was used.
290 user_set_Ttext() const
291 { return this->text_segment_address_ != -1U; }
293 // --threads: Whether to use threads.
296 { return this->threads_; }
298 // --thread-count-initial: Threads to use in initial pass.
300 thread_count_initial() const
301 { return this->thread_count_initial_; }
303 // --thread-count-middle: Threads to use in middle pass.
305 thread_count_middle() const
306 { return this->thread_count_middle_; }
308 // --thread-count-final: Threads to use in final pass.
310 thread_count_final() const
311 { return this->thread_count_final_; }
313 // -z execstack, -z noexecstack
315 is_execstack_set() const
316 { return this->execstack_ != EXECSTACK_FROM_INPUT; }
319 is_stack_executable() const
320 { return this->execstack_ == EXECSTACK_YES; }
324 max_page_size() const
325 { return this->max_page_size_; }
327 // -z common-page-size
329 common_page_size() const
330 { return this->common_page_size_; }
335 { return this->debug_; }
337 // Return the options which may be set from a linker script.
340 { return this->script_options_; }
342 const Script_options*
343 script_options() const
344 { return this->script_options_; }
347 // Don't copy this structure.
348 General_options(const General_options&);
349 General_options& operator=(const General_options&);
351 friend class Command_line;
352 friend class options::Command_line_options;
354 // Which symbols to strip.
357 // Don't strip any symbols.
359 // Strip all symbols.
361 // Strip debugging information.
363 // Strip debugging information that's not used by gdb (at least <= 6.7)
364 STRIP_DEBUG_UNUSED_BY_GDB
367 // Whether to mark the stack as executable.
370 // Not set on command line.
371 EXECSTACK_FROM_INPUT,
372 // Mark the stack as executable.
374 // Mark the stack as not executable.
378 // What compression method to use
379 enum CompressionMethod
386 set_entry(const char* arg)
387 { this->script_options_->set_entry(arg, strlen(arg)); }
390 set_export_dynamic(bool value)
391 { this->export_dynamic_ = value; }
394 set_soname(const char* arg)
395 { this->soname_ = arg; }
398 set_dynamic_linker(const char* arg)
399 { this->dynamic_linker_ = arg; }
402 add_to_search_path(const char* arg)
403 { this->search_path_.push_back(Search_directory(arg, false)); }
406 add_to_search_path_with_sysroot(const char* arg)
407 { this->search_path_.push_back(Search_directory(arg, true)); }
410 set_optimize(const char* arg)
413 this->optimization_level_ = strtol(arg, &endptr, 0);
414 if (*endptr != '\0' || this->optimization_level_ < 0)
415 gold_fatal(_("invalid optimization level: %s"), arg);
419 set_output(const char* arg)
420 { this->output_file_name_ = arg; }
423 set_oformat(const char*);
426 set_relocatable(bool value)
427 { this->is_relocatable_ = value; }
431 { this->strip_ = STRIP_ALL; }
433 // Note: normalize_options() depends on the fact that this turns off
434 // STRIP_ALL if it were already set.
436 set_strip_debug(bool)
437 { this->strip_ = STRIP_DEBUG; }
440 set_strip_debug_gdb(bool)
441 { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
444 set_allow_shlib_undefined(bool value)
445 { this->allow_shlib_undefined_ = value; }
448 set_no_allow_shlib_undefined(bool value)
449 { this->set_allow_shlib_undefined(!value); }
452 set_Bsymbolic(bool value)
453 { this->symbolic_ = value; }
455 void set_compress_debug_sections(const char* arg)
457 if (strcmp(arg, "none") == 0)
458 this->compress_debug_sections_ = NO_COMPRESSION;
460 else if (strcmp(arg, "zlib") == 0)
461 this->compress_debug_sections_ = ZLIB_COMPRESSION;
464 gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
469 add_to_defsym(const char* arg);
472 set_demangle(bool value)
473 { this->demangle_ = value; }
476 set_no_demangle(bool value)
477 { this->set_demangle(!value); }
480 set_detect_odr_violations(bool value)
481 { this->detect_odr_violations_ = value; }
484 set_eh_frame_hdr(bool value)
485 { this->create_eh_frame_hdr_ = value; }
488 add_to_rpath(const char* arg)
489 { this->rpath_.push_back(Search_directory(arg, false)); }
492 add_to_rpath_link(const char* arg)
493 { this->rpath_link_.push_back(Search_directory(arg, false)); }
496 set_shared(bool value)
497 { this->is_shared_ = value; }
500 set_static(bool value)
501 { this->is_static_ = value; }
504 set_stats(bool value)
505 { this->print_stats_ = value; }
508 set_sysroot(const char* arg)
509 { this->sysroot_ = arg; }
512 set_segment_address(const char* name, const char* arg, uint64_t* val)
515 *val = strtoull(arg, &endptr, 0);
516 if (*endptr != '\0' || *val == -1U)
517 gold_fatal(_("invalid argument to %s: %s"), name, arg);
521 set_Tbss(const char* arg)
522 { this->set_segment_address("-Tbss", arg, &this->bss_segment_address_); }
525 set_Tdata(const char* arg)
526 { this->set_segment_address("-Tdata", arg, &this->data_segment_address_); }
529 set_Ttext(const char* arg)
530 { this->set_segment_address("-Ttext", arg, &this->text_segment_address_); }
533 parse_thread_count(const char* arg)
536 const int count = strtol(arg, &endptr, 0);
537 if (*endptr != '\0' || count < 0)
538 gold_fatal(_("invalid thread count: %s"), arg);
543 set_threads(bool value)
545 #ifndef ENABLE_THREADS
547 gold_fatal(_("--threads not supported"));
549 this->threads_ = value;
553 set_no_threads(bool value)
554 { this->set_threads(!value); }
557 set_thread_count(const char* arg)
559 int count = this->parse_thread_count(arg);
560 this->thread_count_initial_ = count;
561 this->thread_count_middle_ = count;
562 this->thread_count_final_ = count;
566 set_thread_count_initial(const char* arg)
567 { this->thread_count_initial_ = this->parse_thread_count(arg); }
570 set_thread_count_middle(const char* arg)
571 { this->thread_count_middle_ = this->parse_thread_count(arg); }
574 set_thread_count_final(const char* arg)
575 { this->thread_count_final_ = this->parse_thread_count(arg); }
583 { this->execstack_ = EXECSTACK_YES; }
586 set_noexecstack(bool)
587 { this->execstack_ = EXECSTACK_NO; }
590 set_max_page_size(const char* arg)
593 this->max_page_size_ = strtoull(arg, &endptr, 0);
594 if (*endptr != '\0' || this->max_page_size_ == 0)
595 gold_fatal(_("invalid max-page-size: %s"), arg);
599 set_common_page_size(const char* arg)
602 this->common_page_size_ = strtoull(arg, &endptr, 0);
603 if (*endptr != '\0' || this->common_page_size_ == 0)
604 gold_fatal(_("invalid common-page-size: %s"), arg);
608 set_debug(unsigned int flags)
609 { this->debug_ = flags; }
611 // Handle the -z option.
613 handle_z_option(const char*);
615 // Handle the --debug option.
617 handle_debug_option(const char*);
619 // Apply any sysroot to the directory lists.
623 bool export_dynamic_;
625 const char* dynamic_linker_;
626 Dir_list search_path_;
627 int optimization_level_;
628 const char* output_file_name_;
629 Object_format oformat_;
630 const char* oformat_string_;
631 bool is_relocatable_;
633 bool allow_shlib_undefined_;
635 CompressionMethod compress_debug_sections_;
637 bool detect_odr_violations_;
638 bool create_eh_frame_hdr_;
640 Dir_list rpath_link_;
644 std::string sysroot_;
645 uint64_t bss_segment_address_;
646 uint64_t data_segment_address_;
647 uint64_t text_segment_address_;
649 int thread_count_initial_;
650 int thread_count_middle_;
651 int thread_count_final_;
652 Execstack execstack_;
653 uint64_t max_page_size_;
654 uint64_t common_page_size_;
656 // Some options can also be set from linker scripts. Those are
658 Script_options* script_options_;
661 // The current state of the position dependent options.
663 class Position_dependent_options
666 typedef General_options::Object_format Object_format;
668 Position_dependent_options();
670 // -Bdynamic/-Bstatic: Whether we are searching for a static archive
671 // -rather than a shared object.
674 { return this->do_static_search_; }
676 // --as-needed: Whether to add a DT_NEEDED argument only if the
677 // dynamic object is used.
680 { return this->as_needed_; }
682 // --whole-archive: Whether to include the entire contents of an
685 whole_archive() const
686 { return this->include_whole_archive_; }
688 // --format: The format of the input file.
691 { return this->input_format_; }
694 set_Bstatic(bool value)
695 { this->do_static_search_ = value; }
698 set_Bdynamic(bool value)
699 { this->set_Bstatic(!value); }
702 set_as_needed(bool value)
703 { this->as_needed_ = value; }
706 set_no_as_needed(bool value)
707 { this->set_as_needed(!value); }
710 set_whole_archive(bool value)
711 { this->include_whole_archive_ = value; }
714 set_no_whole_archive(bool value)
715 { this->set_whole_archive(!value); }
718 set_format(const char*);
721 bool do_static_search_;
723 bool include_whole_archive_;
724 Object_format input_format_;
727 // A single file or library argument from the command line.
729 class Input_file_argument
732 // name: file name or library name
733 // is_lib: true if name is a library name: that is, emits the leading
734 // "lib" and trailing ".so"/".a" from the name
735 // extra_search_path: an extra directory to look for the file, prior
736 // to checking the normal library search path. If this is "",
737 // then no extra directory is added.
738 // just_symbols: whether this file only defines symbols.
739 // options: The position dependent options at this point in the
740 // command line, such as --whole-archive.
741 Input_file_argument()
742 : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
746 Input_file_argument(const char* name, bool is_lib,
747 const char* extra_search_path,
749 const Position_dependent_options& options)
750 : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
751 just_symbols_(just_symbols), options_(options)
756 { return this->name_.c_str(); }
758 const Position_dependent_options&
760 { return this->options_; }
764 { return this->is_lib_; }
767 extra_search_path() const
769 return (this->extra_search_path_.empty()
771 : this->extra_search_path_.c_str());
774 // Return whether we should only read symbols from this file.
777 { return this->just_symbols_; }
779 // Return whether this file may require a search using the -L
782 may_need_search() const
783 { return this->is_lib_ || !this->extra_search_path_.empty(); }
786 // We use std::string, not const char*, here for convenience when
787 // using script files, so that we do not have to preserve the string
791 std::string extra_search_path_;
793 Position_dependent_options options_;
796 // A file or library, or a group, from the command line.
801 // Create a file or library argument.
802 explicit Input_argument(Input_file_argument file)
803 : is_file_(true), file_(file), group_(NULL)
806 // Create a group argument.
807 explicit Input_argument(Input_file_group* group)
808 : is_file_(false), group_(group)
811 // Return whether this is a file.
814 { return this->is_file_; }
816 // Return whether this is a group.
819 { return !this->is_file_; }
821 // Return the information about the file.
822 const Input_file_argument&
825 gold_assert(this->is_file_);
829 // Return the information about the group.
830 const Input_file_group*
833 gold_assert(!this->is_file_);
840 gold_assert(!this->is_file_);
846 Input_file_argument file_;
847 Input_file_group* group_;
850 // A group from the command line. This is a set of arguments within
851 // --start-group ... --end-group.
853 class Input_file_group
856 typedef std::vector<Input_argument> Files;
857 typedef Files::const_iterator const_iterator;
863 // Add a file to the end of the group.
865 add_file(const Input_file_argument& arg)
866 { this->files_.push_back(Input_argument(arg)); }
868 // Iterators to iterate over the group contents.
872 { return this->files_.begin(); }
876 { return this->files_.end(); }
882 // A list of files from the command line or a script.
884 class Input_arguments
887 typedef std::vector<Input_argument> Input_argument_list;
888 typedef Input_argument_list::const_iterator const_iterator;
891 : input_argument_list_(), in_group_(false)
896 add_file(const Input_file_argument& arg);
898 // Start a group (the --start-group option).
902 // End a group (the --end-group option).
906 // Return whether we are currently in a group.
909 { return this->in_group_; }
911 // The number of entries in the list.
914 { return this->input_argument_list_.size(); }
916 // Iterators to iterate over the list of input files.
920 { return this->input_argument_list_.begin(); }
924 { return this->input_argument_list_.end(); }
926 // Return whether the list is empty.
929 { return this->input_argument_list_.empty(); }
932 Input_argument_list input_argument_list_;
936 // All the information read from the command line.
941 typedef Input_arguments::const_iterator const_iterator;
943 Command_line(Script_options*);
945 // Process the command line options. This will exit with an
946 // appropriate error message if an unrecognized option is seen.
948 process(int argc, char** argv);
950 // Process one command-line option. This takes the index of argv to
951 // process, and returns the index for the next option.
953 process_one_option(int argc, char** argv, int i, bool* no_more_options);
955 // Handle a -l option.
957 process_l_option(int, char**, char*, bool);
959 // Handle a -R option when it means --rpath.
961 add_to_rpath(const char* arg)
962 { this->options_.add_to_rpath(arg); }
964 // Add a file for which we just read the symbols.
966 add_just_symbols_file(const char* arg)
968 this->inputs_.add_file(Input_file_argument(arg, false, "", true,
969 this->position_options_));
972 // Handle a --start-group option.
974 start_group(const char* arg);
976 // Handle a --end-group option.
978 end_group(const char* arg);
980 // Get an option argument--a helper function for special processing.
982 get_special_argument(const char* longname, int argc, char** argv,
983 const char* arg, bool long_option,
986 // Get the general options.
987 const General_options&
989 { return this->options_; }
991 // Get the position dependent options.
992 const Position_dependent_options&
993 position_dependent_options() const
994 { return this->position_options_; }
996 // Get the options which may be set from a linker script.
999 { return this->options_.script_options(); }
1001 const Script_options*
1002 script_options() const
1003 { return this->options_.script_options(); }
1005 // The number of input files.
1007 number_of_input_files() const
1008 { return this->inputs_.size(); }
1010 // Iterators to iterate over the list of input files.
1014 { return this->inputs_.begin(); }
1018 { return this->inputs_.end(); }
1021 Command_line(const Command_line&);
1022 Command_line& operator=(const Command_line&);
1024 // Report usage error.
1026 usage() ATTRIBUTE_NORETURN;
1028 usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
1030 usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
1032 // Apply a command line option.
1034 apply_option(const gold::options::One_option&, const char*);
1038 add_file(const char* name, bool is_lib);
1040 // Examine the result of processing the command-line, and verify
1041 // the flags do not contradict each other or are otherwise illegal.
1043 normalize_options();
1045 General_options options_;
1046 Position_dependent_options position_options_;
1047 Input_arguments inputs_;
1050 } // End namespace gold.
1052 #endif // !defined(GOLD_OPTIONS_H)