1 // options.h -- handle command line options for gold -*- C++ -*-
3 // Copyright 2006, 2007 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
46 class Input_file_group;
47 class Position_dependent_options;
52 class Command_line_options;
55 struct One_debug_option;
57 } // End namespace gold::options.
59 // A directory to search. For each directory we record whether it is
60 // in the sysroot. We need to know this so that, if a linker script
61 // is found within the sysroot, we will apply the sysroot to any files
62 // named by that script.
64 class Search_directory
67 // We need a default constructor because we put this in a
70 : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
73 // This is the usual constructor.
74 Search_directory(const char* name, bool put_in_sysroot)
75 : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
76 { gold_assert(!this->name_.empty()); }
78 // This is called if we have a sysroot. The sysroot is prefixed to
79 // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is
80 // set to true for any enries which are in the sysroot (this will
81 // naturally include any entries for which put_in_sysroot_ is true).
82 // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
83 // passing SYSROOT to lrealpath.
85 add_sysroot(const char* sysroot, const char* canonical_sysroot);
87 // Get the directory name.
90 { return this->name_; }
92 // Return whether this directory is in the sysroot.
95 { return this->is_in_sysroot_; }
103 // The position independent options which apply to the whole link.
104 // There are a lot of them.
106 class General_options
111 // -E: export dynamic symbols.
113 export_dynamic() const
114 { return this->export_dynamic_; }
116 // -I: dynamic linker name.
118 dynamic_linker() const
119 { return this->dynamic_linker_; }
121 // -L: Library search path.
122 typedef std::vector<Search_directory> Dir_list;
126 { return this->search_path_; }
128 // -O: optimization level (0: don't try to optimize output size).
130 optimization_level() const
131 { return this->optimization_level_; }
133 // -o: Output file name.
135 output_file_name() const
136 { return this->output_file_name_; }
138 // -r: Whether we are doing a relocatable link.
140 is_relocatable() const
141 { return this->is_relocatable_; }
143 // -s: Strip all symbols.
146 { return this->strip_ == STRIP_ALL; }
148 // -S: Strip debugging information.
151 { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
153 // --strip-debug-gdb: strip only debugging information that's not
154 // used by gdb (at least, for gdb versions <= 6.7).
156 strip_debug_gdb() const
157 { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
159 // --allow-shlib-undefined: do not warn about unresolved symbols in
160 // --shared libraries.
162 allow_shlib_undefined() const
163 { return this->allow_shlib_undefined_; }
165 // -Bsymbolic: bind defined symbols locally.
168 { return this->symbolic_; }
170 // --compress-debug-sections: compress .debug_* sections in the
171 // output file using the given compression method. This is useful
172 // when the tools (such as gdb) support compressed sections.
174 compress_debug_sections() const
175 { return this->compress_debug_sections_ != NO_COMPRESSION; }
178 zlib_compress_debug_sections() const
179 { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
181 // --demangle: demangle C++ symbols in our log messages.
184 { return this->demangle_; }
186 // --detect-odr-violations: Whether to search for One Defn Rule violations.
188 detect_odr_violations() const
189 { return this->detect_odr_violations_; }
191 // --eh-frame-hdr: Whether to generate an exception frame header.
193 create_eh_frame_hdr() const
194 { return this->create_eh_frame_hdr_; }
196 // --rpath: The runtime search path.
199 { return this->rpath_; }
201 // --rpath-link: The link time search patch for shared libraries.
204 { return this->rpath_link_; }
206 // --shared: Whether generating a shared object.
209 { return this->is_shared_; }
211 // --static: Whether doing a static link.
214 { return this->is_static_; }
216 // --stats: Print resource usage statistics.
219 { return this->print_stats_; }
221 // --sysroot: The system root of a cross-linker.
224 { return this->sysroot_; }
226 // -Ttext: The address of the .text section
228 text_segment_address() const
229 { return this->text_segment_address_; }
231 // Whether -Ttext was used.
233 user_set_text_segment_address() const
234 { return this->text_segment_address_ != -1U; }
236 // --threads: Whether to use threads.
239 { return this->threads_; }
241 // --thread-count-initial: Threads to use in initial pass.
243 thread_count_initial() const
244 { return this->thread_count_initial_; }
246 // --thread-count-middle: Threads to use in middle pass.
248 thread_count_middle() const
249 { return this->thread_count_middle_; }
251 // --thread-count-final: Threads to use in final pass.
253 thread_count_final() const
254 { return this->thread_count_final_; }
256 // -z execstack, -z noexecstack
258 is_execstack_set() const
259 { return this->execstack_ != EXECSTACK_FROM_INPUT; }
262 is_stack_executable() const
263 { return this->execstack_ == EXECSTACK_YES; }
268 { return this->debug_; }
271 // Don't copy this structure.
272 General_options(const General_options&);
273 General_options& operator=(const General_options&);
275 friend class Command_line;
276 friend class options::Command_line_options;
278 // Which symbols to strip.
281 // Don't strip any symbols.
283 // Strip all symbols.
285 // Strip debugging information.
287 // Strip debugging information that's not used by gdb (at least <= 6.7)
288 STRIP_DEBUG_UNUSED_BY_GDB
291 // Whether to mark the stack as executable.
294 // Not set on command line.
295 EXECSTACK_FROM_INPUT,
296 // Mark the stack as executable.
298 // Mark the stack as not executable.
302 // What compression method to use
303 enum CompressionMethod
311 { this->export_dynamic_ = true; }
314 set_dynamic_linker(const char* arg)
315 { this->dynamic_linker_ = arg; }
318 add_to_search_path(const char* arg)
319 { this->search_path_.push_back(Search_directory(arg, false)); }
322 add_to_search_path_with_sysroot(const char* arg)
323 { this->search_path_.push_back(Search_directory(arg, true)); }
326 set_optimization_level(const char* arg)
329 this->optimization_level_ = strtol(arg, &endptr, 0);
330 if (*endptr != '\0' || this->optimization_level_ < 0)
331 gold_fatal(_("invalid optimization level: %s"), arg);
335 set_output_file_name(const char* arg)
336 { this->output_file_name_ = arg; }
340 { this->is_relocatable_ = true; }
344 { this->strip_ = STRIP_ALL; }
346 // Note: normalize_options() depends on the fact that this turns off
347 // STRIP_ALL if it were already set.
350 { this->strip_ = STRIP_DEBUG; }
353 set_strip_debug_gdb()
354 { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
357 set_allow_shlib_undefined()
358 { this->allow_shlib_undefined_ = true; }
361 set_no_allow_shlib_undefined()
362 { this->allow_shlib_undefined_ = false; }
366 { this->symbolic_ = true; }
368 void set_compress_debug_sections(const char* arg)
370 if (strcmp(arg, "none") == 0)
371 this->compress_debug_sections_ = NO_COMPRESSION;
373 else if (strcmp(arg, "zlib") == 0)
374 this->compress_debug_sections_ = ZLIB_COMPRESSION;
377 gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
383 { this->demangle_ = true; }
387 { this->demangle_ = false; }
390 set_detect_odr_violations()
391 { this->detect_odr_violations_ = true; }
394 set_create_eh_frame_hdr()
395 { this->create_eh_frame_hdr_ = true; }
398 add_to_rpath(const char* arg)
399 { this->rpath_.push_back(Search_directory(arg, false)); }
402 add_to_rpath_link(const char* arg)
403 { this->rpath_link_.push_back(Search_directory(arg, false)); }
407 { this->is_shared_ = true; }
411 { this->is_static_ = true; }
415 { this->print_stats_ = true; }
418 set_sysroot(const char* arg)
419 { this->sysroot_ = arg; }
422 set_text_segment_address(const char* arg)
425 this->text_segment_address_ = strtoull(arg, &endptr, 0);
427 || this->text_segment_address_ == -1U)
428 gold_fatal(_("invalid argument to -Ttext: %s"), arg);
432 parse_thread_count(const char* arg)
435 const int count = strtol(arg, &endptr, 0);
436 if (*endptr != '\0' || count < 0)
437 gold_fatal(_("invalid thread count: %s"), arg);
444 #ifndef ENABLE_THREADS
445 gold_fatal(_("--threads not supported"));
447 this->threads_ = true;
452 { this->threads_ = false; }
455 set_thread_count(const char* arg)
457 int count = this->parse_thread_count(arg);
458 this->thread_count_initial_ = count;
459 this->thread_count_middle_ = count;
460 this->thread_count_final_ = count;
464 set_thread_count_initial(const char* arg)
465 { this->thread_count_initial_ = this->parse_thread_count(arg); }
468 set_thread_count_middle(const char* arg)
469 { this->thread_count_initial_ = this->parse_thread_count(arg); }
472 set_thread_count_final(const char* arg)
473 { this->thread_count_initial_ = this->parse_thread_count(arg); }
481 { this->execstack_ = EXECSTACK_YES; }
485 { this->execstack_ = EXECSTACK_NO; }
488 set_debug(unsigned int flags)
489 { this->debug_ = flags; }
491 // Handle the -z option.
493 handle_z_option(const char*);
495 // Handle the --debug option.
497 handle_debug_option(const char*);
499 // Apply any sysroot to the directory lists.
503 bool export_dynamic_;
504 const char* dynamic_linker_;
505 Dir_list search_path_;
506 int optimization_level_;
507 const char* output_file_name_;
508 bool is_relocatable_;
510 bool allow_shlib_undefined_;
512 CompressionMethod compress_debug_sections_;
514 bool detect_odr_violations_;
515 bool create_eh_frame_hdr_;
517 Dir_list rpath_link_;
521 std::string sysroot_;
522 uint64_t text_segment_address_;
524 int thread_count_initial_;
525 int thread_count_middle_;
526 int thread_count_final_;
527 Execstack execstack_;
531 // The current state of the position dependent options.
533 class Position_dependent_options
536 Position_dependent_options();
538 // -Bdynamic/-Bstatic: Whether we are searching for a static archive
539 // -rather than a shared object.
541 do_static_search() const
542 { return this->do_static_search_; }
544 // --as-needed: Whether to add a DT_NEEDED argument only if the
545 // dynamic object is used.
548 { return this->as_needed_; }
550 // --whole-archive: Whether to include the entire contents of an
553 include_whole_archive() const
554 { return this->include_whole_archive_; }
558 { this->do_static_search_ = true; }
562 { this->do_static_search_ = false; }
566 { this->as_needed_ = true; }
570 { this->as_needed_ = false; }
574 { this->include_whole_archive_ = true; }
577 clear_whole_archive()
578 { this->include_whole_archive_ = false; }
581 bool do_static_search_;
583 bool include_whole_archive_;
586 // A single file or library argument from the command line.
588 class Input_file_argument
591 // name: file name or library name
592 // is_lib: true if name is a library name: that is, emits the leading
593 // "lib" and trailing ".so"/".a" from the name
594 // extra_search_path: an extra directory to look for the file, prior
595 // to checking the normal library search path. If this is "",
596 // then no extra directory is added.
597 // options: The position dependent options at this point in the
598 // command line, such as --whole-archive.
599 Input_file_argument()
600 : name_(), is_lib_(false), extra_search_path_(""), options_()
603 Input_file_argument(const char* name, bool is_lib,
604 const char* extra_search_path,
605 const Position_dependent_options& options)
606 : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
612 { return this->name_.c_str(); }
614 const Position_dependent_options&
616 { return this->options_; }
620 { return this->is_lib_; }
623 extra_search_path() const
625 return (this->extra_search_path_.empty()
627 : this->extra_search_path_.c_str());
630 // Return whether this file may require a search using the -L
633 may_need_search() const
634 { return this->is_lib_ || !this->extra_search_path_.empty(); }
637 // We use std::string, not const char*, here for convenience when
638 // using script files, so that we do not have to preserve the string
642 std::string extra_search_path_;
643 Position_dependent_options options_;
646 // A file or library, or a group, from the command line.
651 // Create a file or library argument.
652 explicit Input_argument(Input_file_argument file)
653 : is_file_(true), file_(file), group_(NULL)
656 // Create a group argument.
657 explicit Input_argument(Input_file_group* group)
658 : is_file_(false), group_(group)
661 // Return whether this is a file.
664 { return this->is_file_; }
666 // Return whether this is a group.
669 { return !this->is_file_; }
671 // Return the information about the file.
672 const Input_file_argument&
675 gold_assert(this->is_file_);
679 // Return the information about the group.
680 const Input_file_group*
683 gold_assert(!this->is_file_);
690 gold_assert(!this->is_file_);
696 Input_file_argument file_;
697 Input_file_group* group_;
700 // A group from the command line. This is a set of arguments within
701 // --start-group ... --end-group.
703 class Input_file_group
706 typedef std::vector<Input_argument> Files;
707 typedef Files::const_iterator const_iterator;
713 // Add a file to the end of the group.
715 add_file(const Input_file_argument& arg)
716 { this->files_.push_back(Input_argument(arg)); }
718 // Iterators to iterate over the group contents.
722 { return this->files_.begin(); }
726 { return this->files_.end(); }
732 // A list of files from the command line or a script.
734 class Input_arguments
737 typedef std::vector<Input_argument> Input_argument_list;
738 typedef Input_argument_list::const_iterator const_iterator;
741 : input_argument_list_(), in_group_(false)
746 add_file(const Input_file_argument& arg);
748 // Start a group (the --start-group option).
752 // End a group (the --end-group option).
756 // Return whether we are currently in a group.
759 { return this->in_group_; }
761 // The number of entries in the list.
764 { return this->input_argument_list_.size(); }
766 // Iterators to iterate over the list of input files.
770 { return this->input_argument_list_.begin(); }
774 { return this->input_argument_list_.end(); }
776 // Return whether the list is empty.
779 { return this->input_argument_list_.empty(); }
782 Input_argument_list input_argument_list_;
786 // All the information read from the command line.
791 typedef Input_arguments::const_iterator const_iterator;
795 // Process the command line options. This will exit with an
796 // appropriate error message if an unrecognized option is seen.
798 process(int argc, char** argv);
800 // Process one command-line option. This takes the index of argv to
801 // process, and returns the index for the next option.
803 process_one_option(int argc, char** argv, int i, bool* no_more_options);
805 // Handle a -l option.
807 process_l_option(int, char**, char*, bool);
809 // Handle a --start-group option.
811 start_group(const char* arg);
813 // Handle a --end-group option.
815 end_group(const char* arg);
817 // Get an option argument--a helper function for special processing.
819 get_special_argument(const char* longname, int argc, char** argv,
820 const char* arg, bool long_option,
823 // Get the general options.
824 const General_options&
826 { return this->options_; }
828 // Get the position dependent options.
829 const Position_dependent_options&
830 position_dependent_options() const
831 { return this->position_options_; }
833 // The number of input files.
835 number_of_input_files() const
836 { return this->inputs_.size(); }
838 // Iterators to iterate over the list of input files.
842 { return this->inputs_.begin(); }
846 { return this->inputs_.end(); }
849 Command_line(const Command_line&);
850 Command_line& operator=(const Command_line&);
852 // Report usage error.
854 usage() ATTRIBUTE_NORETURN;
856 usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
858 usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
860 // Apply a command line option.
862 apply_option(const gold::options::One_option&, const char*);
866 add_file(const char* name, bool is_lib);
868 // Examine the result of processing the command-line, and verify
869 // the flags do not contradict each other or are otherwise illegal.
873 General_options options_;
874 Position_dependent_options position_options_;
875 Input_arguments inputs_;
878 } // End namespace gold.
880 #endif // !defined(GOLD_OPTIONS_H)