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.
124 // -e: set entry address.
127 { return this->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 // -q: Whether to emit relocations.
173 { return this->emit_relocs_; }
175 // -r: Whether we are doing a relocatable link.
178 { return this->is_relocatable_; }
180 // -s: Strip all symbols.
183 { return this->strip_ == STRIP_ALL; }
185 // -S: Strip debugging information.
188 { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
190 // --strip-debug-gdb: strip only debugging information that's not
191 // used by gdb (at least, for gdb versions <= 6.7).
193 strip_debug_gdb() const
194 { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
196 // --allow-shlib-undefined: do not warn about unresolved symbols in
197 // --shared libraries.
199 allow_shlib_undefined() const
200 { return this->allow_shlib_undefined_; }
202 // -Bsymbolic: bind defined symbols locally.
205 { return this->symbolic_; }
207 // --compress-debug-sections: compress .debug_* sections in the
208 // output file using the given compression method. This is useful
209 // when the tools (such as gdb) support compressed sections.
211 compress_debug_sections() const
212 { return this->compress_debug_sections_ != NO_COMPRESSION; }
215 zlib_compress_debug_sections() const
216 { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
218 // --demangle: demangle C++ symbols in our log messages.
221 { return this->demangle_; }
223 // --detect-odr-violations: Whether to search for One Defn Rule violations.
225 detect_odr_violations() const
226 { return this->detect_odr_violations_; }
228 // --eh-frame-hdr: Whether to generate an exception frame header.
231 { return this->create_eh_frame_hdr_; }
233 // --rpath: The runtime search path.
236 { return this->rpath_; }
238 // --rpath-link: The link time search patch for shared libraries.
241 { return this->rpath_link_; }
243 // --shared: Whether generating a shared object.
246 { return this->is_shared_; }
248 // --static: Whether doing a static link.
251 { return this->is_static_; }
253 // --stats: Print resource usage statistics.
256 { return this->print_stats_; }
258 // --sysroot: The system root of a cross-linker.
261 { return this->sysroot_; }
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_; }
338 // Don't copy this structure.
339 General_options(const General_options&);
340 General_options& operator=(const General_options&);
342 friend class Command_line;
343 friend class options::Command_line_options;
345 // Which symbols to strip.
348 // Don't strip any symbols.
350 // Strip all symbols.
352 // Strip debugging information.
354 // Strip debugging information that's not used by gdb (at least <= 6.7)
355 STRIP_DEBUG_UNUSED_BY_GDB
358 // Whether to mark the stack as executable.
361 // Not set on command line.
362 EXECSTACK_FROM_INPUT,
363 // Mark the stack as executable.
365 // Mark the stack as not executable.
369 // What compression method to use
370 enum CompressionMethod
377 set_entry(const char* arg)
378 { this->entry_ = arg; }
381 set_export_dynamic(bool value)
382 { this->export_dynamic_ = value; }
385 set_soname(const char* arg)
386 { this->soname_ = arg; }
389 set_dynamic_linker(const char* arg)
390 { this->dynamic_linker_ = arg; }
393 add_to_search_path(const char* arg)
394 { this->search_path_.push_back(Search_directory(arg, false)); }
397 add_to_search_path_with_sysroot(const char* arg)
398 { this->search_path_.push_back(Search_directory(arg, true)); }
401 set_optimize(const char* arg)
404 this->optimization_level_ = strtol(arg, &endptr, 0);
405 if (*endptr != '\0' || this->optimization_level_ < 0)
406 gold_fatal(_("invalid optimization level: %s"), arg);
410 set_output(const char* arg)
411 { this->output_file_name_ = arg; }
414 set_oformat(const char*);
417 set_emit_relocs(bool value)
418 { this->emit_relocs_ = value; }
421 set_relocatable(bool value)
422 { this->is_relocatable_ = value; }
426 { this->strip_ = STRIP_ALL; }
428 // Note: normalize_options() depends on the fact that this turns off
429 // STRIP_ALL if it were already set.
431 set_strip_debug(bool)
432 { this->strip_ = STRIP_DEBUG; }
435 set_strip_debug_gdb(bool)
436 { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
439 set_allow_shlib_undefined(bool value)
440 { this->allow_shlib_undefined_ = value; }
443 set_no_allow_shlib_undefined(bool value)
444 { this->set_allow_shlib_undefined(!value); }
447 set_Bsymbolic(bool value)
448 { this->symbolic_ = value; }
450 void set_compress_debug_sections(const char* arg)
452 if (strcmp(arg, "none") == 0)
453 this->compress_debug_sections_ = NO_COMPRESSION;
455 else if (strcmp(arg, "zlib") == 0)
456 this->compress_debug_sections_ = ZLIB_COMPRESSION;
459 gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
464 add_to_defsym(const char* arg);
467 set_demangle(bool value)
468 { this->demangle_ = value; }
471 set_no_demangle(bool value)
472 { this->set_demangle(!value); }
475 set_detect_odr_violations(bool value)
476 { this->detect_odr_violations_ = value; }
479 set_eh_frame_hdr(bool value)
480 { this->create_eh_frame_hdr_ = value; }
483 add_to_rpath(const char* arg)
484 { this->rpath_.push_back(Search_directory(arg, false)); }
487 add_to_rpath_link(const char* arg)
488 { this->rpath_link_.push_back(Search_directory(arg, false)); }
491 set_shared(bool value)
492 { this->is_shared_ = value; }
495 set_static(bool value)
496 { this->is_static_ = value; }
499 set_stats(bool value)
500 { this->print_stats_ = value; }
503 set_sysroot(const char* arg)
504 { this->sysroot_ = arg; }
507 set_segment_address(const char* name, const char* arg, uint64_t* val)
510 *val = strtoull(arg, &endptr, 0);
511 if (*endptr != '\0' || *val == -1U)
512 gold_fatal(_("invalid argument to %s: %s"), name, arg);
516 set_Tbss(const char* arg)
517 { this->set_segment_address("-Tbss", arg, &this->bss_segment_address_); }
520 set_Tdata(const char* arg)
521 { this->set_segment_address("-Tdata", arg, &this->data_segment_address_); }
524 set_Ttext(const char* arg)
525 { this->set_segment_address("-Ttext", arg, &this->text_segment_address_); }
528 parse_thread_count(const char* arg)
531 const int count = strtol(arg, &endptr, 0);
532 if (*endptr != '\0' || count < 0)
533 gold_fatal(_("invalid thread count: %s"), arg);
538 set_threads(bool value)
540 #ifndef ENABLE_THREADS
542 gold_fatal(_("--threads not supported"));
544 this->threads_ = value;
548 set_no_threads(bool value)
549 { this->set_threads(!value); }
552 set_thread_count(const char* arg)
554 int count = this->parse_thread_count(arg);
555 this->thread_count_initial_ = count;
556 this->thread_count_middle_ = count;
557 this->thread_count_final_ = count;
561 set_thread_count_initial(const char* arg)
562 { this->thread_count_initial_ = this->parse_thread_count(arg); }
565 set_thread_count_middle(const char* arg)
566 { this->thread_count_middle_ = this->parse_thread_count(arg); }
569 set_thread_count_final(const char* arg)
570 { this->thread_count_final_ = this->parse_thread_count(arg); }
578 { this->execstack_ = EXECSTACK_YES; }
581 set_noexecstack(bool)
582 { this->execstack_ = EXECSTACK_NO; }
585 set_max_page_size(const char* arg)
588 this->max_page_size_ = strtoull(arg, &endptr, 0);
589 if (*endptr != '\0' || this->max_page_size_ == 0)
590 gold_fatal(_("invalid max-page-size: %s"), arg);
594 set_common_page_size(const char* arg)
597 this->common_page_size_ = strtoull(arg, &endptr, 0);
598 if (*endptr != '\0' || this->common_page_size_ == 0)
599 gold_fatal(_("invalid common-page-size: %s"), arg);
603 set_debug(unsigned int flags)
604 { this->debug_ = flags; }
606 // Handle the -z option.
608 handle_z_option(const char*);
610 // Handle the --debug option.
612 handle_debug_option(const char*);
614 // Apply any sysroot to the directory lists.
619 bool export_dynamic_;
621 const char* dynamic_linker_;
622 Dir_list search_path_;
623 int optimization_level_;
624 const char* output_file_name_;
625 Object_format oformat_;
626 const char* oformat_string_;
628 bool is_relocatable_;
630 bool allow_shlib_undefined_;
632 CompressionMethod compress_debug_sections_;
634 bool detect_odr_violations_;
635 bool create_eh_frame_hdr_;
637 Dir_list rpath_link_;
641 std::string sysroot_;
642 uint64_t bss_segment_address_;
643 uint64_t data_segment_address_;
644 uint64_t text_segment_address_;
646 int thread_count_initial_;
647 int thread_count_middle_;
648 int thread_count_final_;
649 Execstack execstack_;
650 uint64_t max_page_size_;
651 uint64_t common_page_size_;
655 // The current state of the position dependent options.
657 class Position_dependent_options
660 typedef General_options::Object_format Object_format;
662 Position_dependent_options();
664 // -Bdynamic/-Bstatic: Whether we are searching for a static archive
665 // -rather than a shared object.
668 { return this->do_static_search_; }
670 // --as-needed: Whether to add a DT_NEEDED argument only if the
671 // dynamic object is used.
674 { return this->as_needed_; }
676 // --whole-archive: Whether to include the entire contents of an
679 whole_archive() const
680 { return this->include_whole_archive_; }
682 // --format: The format of the input file.
685 { return this->input_format_; }
688 set_Bstatic(bool value)
689 { this->do_static_search_ = value; }
692 set_Bdynamic(bool value)
693 { this->set_Bstatic(!value); }
696 set_as_needed(bool value)
697 { this->as_needed_ = value; }
700 set_no_as_needed(bool value)
701 { this->set_as_needed(!value); }
704 set_whole_archive(bool value)
705 { this->include_whole_archive_ = value; }
708 set_no_whole_archive(bool value)
709 { this->set_whole_archive(!value); }
712 set_format(const char*);
715 bool do_static_search_;
717 bool include_whole_archive_;
718 Object_format input_format_;
721 // A single file or library argument from the command line.
723 class Input_file_argument
726 // name: file name or library name
727 // is_lib: true if name is a library name: that is, emits the leading
728 // "lib" and trailing ".so"/".a" from the name
729 // extra_search_path: an extra directory to look for the file, prior
730 // to checking the normal library search path. If this is "",
731 // then no extra directory is added.
732 // just_symbols: whether this file only defines symbols.
733 // options: The position dependent options at this point in the
734 // command line, such as --whole-archive.
735 Input_file_argument()
736 : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
740 Input_file_argument(const char* name, bool is_lib,
741 const char* extra_search_path,
743 const Position_dependent_options& options)
744 : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
745 just_symbols_(just_symbols), options_(options)
750 { return this->name_.c_str(); }
752 const Position_dependent_options&
754 { return this->options_; }
758 { return this->is_lib_; }
761 extra_search_path() const
763 return (this->extra_search_path_.empty()
765 : this->extra_search_path_.c_str());
768 // Return whether we should only read symbols from this file.
771 { return this->just_symbols_; }
773 // Return whether this file may require a search using the -L
776 may_need_search() const
777 { return this->is_lib_ || !this->extra_search_path_.empty(); }
780 // We use std::string, not const char*, here for convenience when
781 // using script files, so that we do not have to preserve the string
785 std::string extra_search_path_;
787 Position_dependent_options options_;
790 // A file or library, or a group, from the command line.
795 // Create a file or library argument.
796 explicit Input_argument(Input_file_argument file)
797 : is_file_(true), file_(file), group_(NULL)
800 // Create a group argument.
801 explicit Input_argument(Input_file_group* group)
802 : is_file_(false), group_(group)
805 // Return whether this is a file.
808 { return this->is_file_; }
810 // Return whether this is a group.
813 { return !this->is_file_; }
815 // Return the information about the file.
816 const Input_file_argument&
819 gold_assert(this->is_file_);
823 // Return the information about the group.
824 const Input_file_group*
827 gold_assert(!this->is_file_);
834 gold_assert(!this->is_file_);
840 Input_file_argument file_;
841 Input_file_group* group_;
844 // A group from the command line. This is a set of arguments within
845 // --start-group ... --end-group.
847 class Input_file_group
850 typedef std::vector<Input_argument> Files;
851 typedef Files::const_iterator const_iterator;
857 // Add a file to the end of the group.
859 add_file(const Input_file_argument& arg)
860 { this->files_.push_back(Input_argument(arg)); }
862 // Iterators to iterate over the group contents.
866 { return this->files_.begin(); }
870 { return this->files_.end(); }
876 // A list of files from the command line or a script.
878 class Input_arguments
881 typedef std::vector<Input_argument> Input_argument_list;
882 typedef Input_argument_list::const_iterator const_iterator;
885 : input_argument_list_(), in_group_(false)
890 add_file(const Input_file_argument& arg);
892 // Start a group (the --start-group option).
896 // End a group (the --end-group option).
900 // Return whether we are currently in a group.
903 { return this->in_group_; }
905 // The number of entries in the list.
908 { return this->input_argument_list_.size(); }
910 // Iterators to iterate over the list of input files.
914 { return this->input_argument_list_.begin(); }
918 { return this->input_argument_list_.end(); }
920 // Return whether the list is empty.
923 { return this->input_argument_list_.empty(); }
926 Input_argument_list input_argument_list_;
930 // All the information read from the command line.
935 typedef Input_arguments::const_iterator const_iterator;
939 // Process the command line options. This will exit with an
940 // appropriate error message if an unrecognized option is seen.
942 process(int argc, char** argv);
944 // Process one command-line option. This takes the index of argv to
945 // process, and returns the index for the next option.
947 process_one_option(int argc, char** argv, int i, bool* no_more_options);
949 // Handle a -l option.
951 process_l_option(int, char**, char*, bool);
953 // Handle a -R option when it means --rpath.
955 add_to_rpath(const char* arg)
956 { this->options_.add_to_rpath(arg); }
958 // Add a file for which we just read the symbols.
960 add_just_symbols_file(const char* arg)
962 this->inputs_.add_file(Input_file_argument(arg, false, "", true,
963 this->position_options_));
966 // Handle a --start-group option.
968 start_group(const char* arg);
970 // Handle a --end-group option.
972 end_group(const char* arg);
974 // Get an option argument--a helper function for special processing.
976 get_special_argument(const char* longname, int argc, char** argv,
977 const char* arg, bool long_option,
980 // Get the general options.
981 const General_options&
983 { return this->options_; }
985 // Get the position dependent options.
986 const Position_dependent_options&
987 position_dependent_options() const
988 { return this->position_options_; }
990 // Get the linker-script options.
993 { return this->script_options_; }
995 // Get the version-script options: a convenience routine.
996 const Version_script_info&
997 version_script() const
998 { return *this->script_options_.version_script_info(); }
1000 // The number of input files.
1002 number_of_input_files() const
1003 { return this->inputs_.size(); }
1005 // Iterators to iterate over the list of input files.
1009 { return this->inputs_.begin(); }
1013 { return this->inputs_.end(); }
1016 Command_line(const Command_line&);
1017 Command_line& operator=(const Command_line&);
1019 // Report usage error.
1021 usage() ATTRIBUTE_NORETURN;
1023 usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
1025 usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
1027 // Apply a command line option.
1029 apply_option(const gold::options::One_option&, const char*);
1033 add_file(const char* name, bool is_lib);
1035 // Examine the result of processing the command-line, and verify
1036 // the flags do not contradict each other or are otherwise illegal.
1038 normalize_options();
1040 General_options options_;
1041 Position_dependent_options position_options_;
1042 Script_options script_options_;
1043 Input_arguments inputs_;
1046 } // End namespace gold.
1048 #endif // !defined(GOLD_OPTIONS_H)