* ldgram.y (input_section_spec_no_keep): Don't ignore sect_flags.
[binutils.git] / gold / plugin.cc
blob637613c897a217eebf2a57da5f4df178c1ec3b3e
1 // plugin.cc -- plugin manager for gold -*- C++ -*-
3 // Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Cary Coutant <ccoutant@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.
23 #include "gold.h"
25 #include <cstdio>
26 #include <cstdarg>
27 #include <cstring>
28 #include <string>
29 #include <vector>
31 #ifdef ENABLE_PLUGINS
32 #include <dlfcn.h>
33 #endif
35 #include "parameters.h"
36 #include "errors.h"
37 #include "fileread.h"
38 #include "layout.h"
39 #include "options.h"
40 #include "plugin.h"
41 #include "target.h"
42 #include "readsyms.h"
43 #include "symtab.h"
44 #include "elfcpp.h"
46 namespace gold
49 #ifdef ENABLE_PLUGINS
51 // The linker's exported interfaces.
53 extern "C"
56 static enum ld_plugin_status
57 register_claim_file(ld_plugin_claim_file_handler handler);
59 static enum ld_plugin_status
60 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
62 static enum ld_plugin_status
63 register_cleanup(ld_plugin_cleanup_handler handler);
65 static enum ld_plugin_status
66 add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
68 static enum ld_plugin_status
69 get_input_file(const void *handle, struct ld_plugin_input_file *file);
71 static enum ld_plugin_status
72 get_view(const void *handle, const void **viewp);
74 static enum ld_plugin_status
75 release_input_file(const void *handle);
77 static enum ld_plugin_status
78 get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
80 static enum ld_plugin_status
81 get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
83 static enum ld_plugin_status
84 add_input_file(const char *pathname);
86 static enum ld_plugin_status
87 add_input_library(const char *pathname);
89 static enum ld_plugin_status
90 set_extra_library_path(const char *path);
92 static enum ld_plugin_status
93 message(int level, const char *format, ...);
95 static enum ld_plugin_status
96 get_input_section_count(const void* handle, unsigned int* count);
98 static enum ld_plugin_status
99 get_input_section_type(const struct ld_plugin_section section,
100 unsigned int* type);
102 static enum ld_plugin_status
103 get_input_section_name(const struct ld_plugin_section section,
104 char** section_name_ptr);
106 static enum ld_plugin_status
107 get_input_section_contents(const struct ld_plugin_section section,
108 const unsigned char** section_contents,
109 size_t* len);
111 static enum ld_plugin_status
112 update_section_order(const struct ld_plugin_section *section_list,
113 unsigned int num_sections);
115 static enum ld_plugin_status
116 allow_section_ordering();
120 #endif // ENABLE_PLUGINS
122 static Pluginobj* make_sized_plugin_object(Input_file* input_file,
123 off_t offset, off_t filesize);
125 // Plugin methods.
127 // Load one plugin library.
129 void
130 Plugin::load()
132 #ifdef ENABLE_PLUGINS
133 // Load the plugin library.
134 // FIXME: Look for the library in standard locations.
135 this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
136 if (this->handle_ == NULL)
138 gold_error(_("%s: could not load plugin library: %s"),
139 this->filename_.c_str(), dlerror());
140 return;
143 // Find the plugin's onload entry point.
144 void* ptr = dlsym(this->handle_, "onload");
145 if (ptr == NULL)
147 gold_error(_("%s: could not find onload entry point"),
148 this->filename_.c_str());
149 return;
151 ld_plugin_onload onload;
152 gold_assert(sizeof(onload) == sizeof(ptr));
153 memcpy(&onload, &ptr, sizeof(ptr));
155 // Get the linker's version number.
156 const char* ver = get_version_string();
157 int major = 0;
158 int minor = 0;
159 sscanf(ver, "%d.%d", &major, &minor);
161 // Allocate and populate a transfer vector.
162 const int tv_fixed_size = 24;
164 int tv_size = this->args_.size() + tv_fixed_size;
165 ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
167 // Put LDPT_MESSAGE at the front of the list so the plugin can use it
168 // while processing subsequent entries.
169 int i = 0;
170 tv[i].tv_tag = LDPT_MESSAGE;
171 tv[i].tv_u.tv_message = message;
173 ++i;
174 tv[i].tv_tag = LDPT_API_VERSION;
175 tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
177 ++i;
178 tv[i].tv_tag = LDPT_GOLD_VERSION;
179 tv[i].tv_u.tv_val = major * 100 + minor;
181 ++i;
182 tv[i].tv_tag = LDPT_LINKER_OUTPUT;
183 if (parameters->options().relocatable())
184 tv[i].tv_u.tv_val = LDPO_REL;
185 else if (parameters->options().shared())
186 tv[i].tv_u.tv_val = LDPO_DYN;
187 else
188 tv[i].tv_u.tv_val = LDPO_EXEC;
190 ++i;
191 tv[i].tv_tag = LDPT_OUTPUT_NAME;
192 tv[i].tv_u.tv_string = parameters->options().output();
194 for (unsigned int j = 0; j < this->args_.size(); ++j)
196 ++i;
197 tv[i].tv_tag = LDPT_OPTION;
198 tv[i].tv_u.tv_string = this->args_[j].c_str();
201 ++i;
202 tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
203 tv[i].tv_u.tv_register_claim_file = register_claim_file;
205 ++i;
206 tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
207 tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
209 ++i;
210 tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
211 tv[i].tv_u.tv_register_cleanup = register_cleanup;
213 ++i;
214 tv[i].tv_tag = LDPT_ADD_SYMBOLS;
215 tv[i].tv_u.tv_add_symbols = add_symbols;
217 ++i;
218 tv[i].tv_tag = LDPT_GET_INPUT_FILE;
219 tv[i].tv_u.tv_get_input_file = get_input_file;
221 ++i;
222 tv[i].tv_tag = LDPT_GET_VIEW;
223 tv[i].tv_u.tv_get_view = get_view;
225 ++i;
226 tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
227 tv[i].tv_u.tv_release_input_file = release_input_file;
229 ++i;
230 tv[i].tv_tag = LDPT_GET_SYMBOLS;
231 tv[i].tv_u.tv_get_symbols = get_symbols;
233 ++i;
234 tv[i].tv_tag = LDPT_GET_SYMBOLS_V2;
235 tv[i].tv_u.tv_get_symbols = get_symbols_v2;
237 ++i;
238 tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
239 tv[i].tv_u.tv_add_input_file = add_input_file;
241 ++i;
242 tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
243 tv[i].tv_u.tv_add_input_library = add_input_library;
245 ++i;
246 tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
247 tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
249 ++i;
250 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_COUNT;
251 tv[i].tv_u.tv_get_input_section_count = get_input_section_count;
253 ++i;
254 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_TYPE;
255 tv[i].tv_u.tv_get_input_section_type = get_input_section_type;
257 ++i;
258 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_NAME;
259 tv[i].tv_u.tv_get_input_section_name = get_input_section_name;
261 ++i;
262 tv[i].tv_tag = LDPT_GET_INPUT_SECTION_CONTENTS;
263 tv[i].tv_u.tv_get_input_section_contents = get_input_section_contents;
265 ++i;
266 tv[i].tv_tag = LDPT_UPDATE_SECTION_ORDER;
267 tv[i].tv_u.tv_update_section_order = update_section_order;
269 ++i;
270 tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING;
271 tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering;
273 ++i;
274 tv[i].tv_tag = LDPT_NULL;
275 tv[i].tv_u.tv_val = 0;
277 gold_assert(i == tv_size - 1);
279 // Call the onload entry point.
280 (*onload)(tv);
282 delete[] tv;
283 #endif // ENABLE_PLUGINS
286 // Call the plugin claim-file handler.
288 inline bool
289 Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file)
291 int claimed = 0;
293 if (this->claim_file_handler_ != NULL)
295 (*this->claim_file_handler_)(plugin_input_file, &claimed);
296 if (claimed)
297 return true;
299 return false;
302 // Call the all-symbols-read handler.
304 inline void
305 Plugin::all_symbols_read()
307 if (this->all_symbols_read_handler_ != NULL)
308 (*this->all_symbols_read_handler_)();
311 // Call the cleanup handler.
313 inline void
314 Plugin::cleanup()
316 if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
318 // Set this flag before calling to prevent a recursive plunge
319 // in the event that a plugin's cleanup handler issues a
320 // fatal error.
321 this->cleanup_done_ = true;
322 (*this->cleanup_handler_)();
326 // This task is used to rescan archives as needed.
328 class Plugin_rescan : public Task
330 public:
331 Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker)
332 : this_blocker_(this_blocker), next_blocker_(next_blocker)
335 ~Plugin_rescan()
337 delete this->this_blocker_;
340 Task_token*
341 is_runnable()
343 if (this->this_blocker_->is_blocked())
344 return this->this_blocker_;
345 return NULL;
348 void
349 locks(Task_locker* tl)
350 { tl->add(this, this->next_blocker_); }
352 void
353 run(Workqueue*)
354 { parameters->options().plugins()->rescan(this); }
356 std::string
357 get_name() const
358 { return "Plugin_rescan"; }
360 private:
361 Task_token* this_blocker_;
362 Task_token* next_blocker_;
365 // Plugin_manager methods.
367 Plugin_manager::~Plugin_manager()
369 for (Plugin_list::iterator p = this->plugins_.begin();
370 p != this->plugins_.end();
371 ++p)
372 delete *p;
373 this->plugins_.clear();
374 for (Object_list::iterator obj = this->objects_.begin();
375 obj != this->objects_.end();
376 ++obj)
377 delete *obj;
378 this->objects_.clear();
381 // Load all plugin libraries.
383 void
384 Plugin_manager::load_plugins(Layout* layout)
386 this->layout_ = layout;
387 for (this->current_ = this->plugins_.begin();
388 this->current_ != this->plugins_.end();
389 ++this->current_)
390 (*this->current_)->load();
393 // Call the plugin claim-file handlers in turn to see if any claim the file.
395 Pluginobj*
396 Plugin_manager::claim_file(Input_file* input_file, off_t offset,
397 off_t filesize, Object* elf_object)
399 if (this->in_replacement_phase_)
400 return NULL;
402 unsigned int handle = this->objects_.size();
403 this->input_file_ = input_file;
404 this->plugin_input_file_.name = input_file->filename().c_str();
405 this->plugin_input_file_.fd = input_file->file().descriptor();
406 this->plugin_input_file_.offset = offset;
407 this->plugin_input_file_.filesize = filesize;
408 this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
409 if (elf_object != NULL)
410 this->objects_.push_back(elf_object);
411 this->in_claim_file_handler_ = true;
413 for (this->current_ = this->plugins_.begin();
414 this->current_ != this->plugins_.end();
415 ++this->current_)
417 if ((*this->current_)->claim_file(&this->plugin_input_file_))
419 this->any_claimed_ = true;
420 this->in_claim_file_handler_ = false;
422 if (this->objects_.size() > handle
423 && this->objects_[handle]->pluginobj() != NULL)
424 return this->objects_[handle]->pluginobj();
426 // If the plugin claimed the file but did not call the
427 // add_symbols callback, we need to create the Pluginobj now.
428 Pluginobj* obj = this->make_plugin_object(handle);
429 return obj;
433 this->in_claim_file_handler_ = false;
434 return NULL;
437 // Save an archive. This is used so that a plugin can add a file
438 // which refers to a symbol which was not previously referenced. In
439 // that case we want to pretend that the symbol was referenced before,
440 // and pull in the archive object.
442 void
443 Plugin_manager::save_archive(Archive* archive)
445 if (this->in_replacement_phase_ || !this->any_claimed_)
446 delete archive;
447 else
448 this->rescannable_.push_back(Rescannable(archive));
451 // Save an Input_group. This is like save_archive.
453 void
454 Plugin_manager::save_input_group(Input_group* input_group)
456 if (this->in_replacement_phase_ || !this->any_claimed_)
457 delete input_group;
458 else
459 this->rescannable_.push_back(Rescannable(input_group));
462 // Call the all-symbols-read handlers.
464 void
465 Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
466 Input_objects* input_objects,
467 Symbol_table* symtab,
468 Dirsearch* dirpath, Mapfile* mapfile,
469 Task_token** last_blocker)
471 this->in_replacement_phase_ = true;
472 this->workqueue_ = workqueue;
473 this->task_ = task;
474 this->input_objects_ = input_objects;
475 this->symtab_ = symtab;
476 this->dirpath_ = dirpath;
477 this->mapfile_ = mapfile;
478 this->this_blocker_ = NULL;
480 for (this->current_ = this->plugins_.begin();
481 this->current_ != this->plugins_.end();
482 ++this->current_)
483 (*this->current_)->all_symbols_read();
485 if (this->any_added_)
487 Task_token* next_blocker = new Task_token(true);
488 next_blocker->add_blocker();
489 workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker));
490 this->this_blocker_ = next_blocker;
493 *last_blocker = this->this_blocker_;
496 // This is called when we see a new undefined symbol. If we are in
497 // the replacement phase, this means that we may need to rescan some
498 // archives we have previously seen.
500 void
501 Plugin_manager::new_undefined_symbol(Symbol* sym)
503 if (this->in_replacement_phase_)
504 this->undefined_symbols_.push_back(sym);
507 // Rescan archives as needed. This handles the case where a new
508 // object file added by a plugin has an undefined reference to some
509 // symbol defined in an archive.
511 void
512 Plugin_manager::rescan(Task* task)
514 size_t rescan_pos = 0;
515 size_t rescan_size = this->rescannable_.size();
516 while (!this->undefined_symbols_.empty())
518 if (rescan_pos >= rescan_size)
520 this->undefined_symbols_.clear();
521 return;
524 Undefined_symbol_list undefs;
525 undefs.reserve(this->undefined_symbols_.size());
526 this->undefined_symbols_.swap(undefs);
528 size_t min_rescan_pos = rescan_size;
530 for (Undefined_symbol_list::const_iterator p = undefs.begin();
531 p != undefs.end();
532 ++p)
534 if (!(*p)->is_undefined())
535 continue;
537 this->undefined_symbols_.push_back(*p);
539 // Find the first rescan archive which defines this symbol,
540 // starting at the current rescan position. The rescan position
541 // exists so that given -la -lb -lc we don't look for undefined
542 // symbols in -lb back in -la, but instead get the definition
543 // from -lc. Don't bother to look past the current minimum
544 // rescan position.
545 for (size_t i = rescan_pos; i < min_rescan_pos; ++i)
547 if (this->rescannable_defines(i, *p))
549 min_rescan_pos = i;
550 break;
555 if (min_rescan_pos >= rescan_size)
557 // We didn't find any rescannable archives which define any
558 // undefined symbols.
559 return;
562 const Rescannable& r(this->rescannable_[min_rescan_pos]);
563 if (r.is_archive)
565 Task_lock_obj<Archive> tl(task, r.u.archive);
566 r.u.archive->add_symbols(this->symtab_, this->layout_,
567 this->input_objects_, this->mapfile_);
569 else
571 size_t next_saw_undefined = this->symtab_->saw_undefined();
572 size_t saw_undefined;
575 saw_undefined = next_saw_undefined;
577 for (Input_group::const_iterator p = r.u.input_group->begin();
578 p != r.u.input_group->end();
579 ++p)
581 Task_lock_obj<Archive> tl(task, *p);
583 (*p)->add_symbols(this->symtab_, this->layout_,
584 this->input_objects_, this->mapfile_);
587 next_saw_undefined = this->symtab_->saw_undefined();
589 while (saw_undefined != next_saw_undefined);
592 for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i)
594 if (this->rescannable_[i].is_archive)
595 delete this->rescannable_[i].u.archive;
596 else
597 delete this->rescannable_[i].u.input_group;
600 rescan_pos = min_rescan_pos + 1;
604 // Return whether the rescannable at index I defines SYM.
606 bool
607 Plugin_manager::rescannable_defines(size_t i, Symbol* sym)
609 const Rescannable& r(this->rescannable_[i]);
610 if (r.is_archive)
611 return r.u.archive->defines_symbol(sym);
612 else
614 for (Input_group::const_iterator p = r.u.input_group->begin();
615 p != r.u.input_group->end();
616 ++p)
618 if ((*p)->defines_symbol(sym))
619 return true;
621 return false;
625 // Layout deferred objects.
627 void
628 Plugin_manager::layout_deferred_objects()
630 Deferred_layout_list::iterator obj;
632 for (obj = this->deferred_layout_objects_.begin();
633 obj != this->deferred_layout_objects_.end();
634 ++obj)
636 // Lock the object so we can read from it. This is only called
637 // single-threaded from queue_middle_tasks, so it is OK to lock.
638 // Unfortunately we have no way to pass in a Task token.
639 const Task* dummy_task = reinterpret_cast<const Task*>(-1);
640 Task_lock_obj<Object> tl(dummy_task, *obj);
641 (*obj)->layout_deferred_sections(this->layout_);
645 // Call the cleanup handlers.
647 void
648 Plugin_manager::cleanup()
650 for (this->current_ = this->plugins_.begin();
651 this->current_ != this->plugins_.end();
652 ++this->current_)
653 (*this->current_)->cleanup();
656 // Make a new Pluginobj object. This is called when the plugin calls
657 // the add_symbols API.
659 Pluginobj*
660 Plugin_manager::make_plugin_object(unsigned int handle)
662 // Make sure we aren't asked to make an object for the same handle twice.
663 if (this->objects_.size() != handle
664 && this->objects_[handle]->pluginobj() != NULL)
665 return NULL;
667 Pluginobj* obj = make_sized_plugin_object(this->input_file_,
668 this->plugin_input_file_.offset,
669 this->plugin_input_file_.filesize);
672 // If the elf object for this file was pushed into the objects_ vector, delete
673 // it to make room for the Pluginobj as this file is claimed.
674 if (this->objects_.size() != handle)
675 this->objects_.pop_back();
677 this->objects_.push_back(obj);
678 return obj;
681 // Get the input file information with an open (possibly re-opened)
682 // file descriptor.
684 ld_plugin_status
685 Plugin_manager::get_input_file(unsigned int handle,
686 struct ld_plugin_input_file* file)
688 Pluginobj* obj = this->object(handle)->pluginobj();
689 if (obj == NULL)
690 return LDPS_BAD_HANDLE;
692 obj->lock(this->task_);
693 file->name = obj->filename().c_str();
694 file->fd = obj->descriptor();
695 file->offset = obj->offset();
696 file->filesize = obj->filesize();
697 file->handle = reinterpret_cast<void*>(handle);
698 return LDPS_OK;
701 // Release the input file.
703 ld_plugin_status
704 Plugin_manager::release_input_file(unsigned int handle)
706 if (this->object(handle) == NULL)
707 return LDPS_BAD_HANDLE;
709 Pluginobj* obj = this->object(handle)->pluginobj();
711 if (obj == NULL)
712 return LDPS_BAD_HANDLE;
714 obj->unlock(this->task_);
715 return LDPS_OK;
718 // Get the elf object corresponding to the handle. Return NULL if we
719 // found a Pluginobj instead.
721 Object*
722 Plugin_manager::get_elf_object(const void* handle)
724 Object* obj = this->object(
725 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
727 // The object should not be a Pluginobj.
728 if (obj == NULL
729 || obj->pluginobj() != NULL)
730 return NULL;
732 return obj;
735 ld_plugin_status
736 Plugin_manager::get_view(unsigned int handle, const void **viewp)
738 off_t offset;
739 size_t filesize;
740 Input_file *input_file;
741 if (this->in_claim_file_handler_)
743 // We are being called from the claim_file hook.
744 const struct ld_plugin_input_file &f = this->plugin_input_file_;
745 offset = f.offset;
746 filesize = f.filesize;
747 input_file = this->input_file_;
749 else
751 // An already claimed file.
752 if (this->object(handle) == NULL)
753 return LDPS_BAD_HANDLE;
754 Pluginobj* obj = this->object(handle)->pluginobj();
755 if (obj == NULL)
756 return LDPS_BAD_HANDLE;
757 offset = obj->offset();
758 filesize = obj->filesize();
759 input_file = obj->input_file();
761 *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false,
762 false);
763 return LDPS_OK;
766 // Add a new library path.
768 ld_plugin_status
769 Plugin_manager::set_extra_library_path(const char* path)
771 this->extra_search_path_ = std::string(path);
772 return LDPS_OK;
775 // Add a new input file.
777 ld_plugin_status
778 Plugin_manager::add_input_file(const char* pathname, bool is_lib)
780 Input_file_argument file(pathname,
781 (is_lib
782 ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
783 : Input_file_argument::INPUT_FILE_TYPE_FILE),
784 (is_lib
785 ? this->extra_search_path_.c_str()
786 : ""),
787 false,
788 this->options_);
789 Input_argument* input_argument = new Input_argument(file);
790 Task_token* next_blocker = new Task_token(true);
791 next_blocker->add_blocker();
792 if (parameters->incremental())
793 gold_error(_("input files added by plug-ins in --incremental mode not "
794 "supported yet"));
795 this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
796 this->symtab_,
797 this->layout_,
798 this->dirpath_,
800 this->mapfile_,
801 input_argument,
802 NULL,
803 NULL,
804 this->this_blocker_,
805 next_blocker));
806 this->this_blocker_ = next_blocker;
807 this->any_added_ = true;
808 return LDPS_OK;
811 // Class Pluginobj.
813 Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
814 off_t offset, off_t filesize)
815 : Object(name, input_file, false, offset),
816 nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
820 // Return TRUE if a defined symbol is referenced from outside the
821 // universe of claimed objects. Only references from relocatable,
822 // non-IR (unclaimed) objects count as a reference. References from
823 // dynamic objects count only as "visible".
825 static inline bool
826 is_referenced_from_outside(Symbol* lsym)
828 if (lsym->in_real_elf())
829 return true;
830 if (parameters->options().relocatable())
831 return true;
832 if (parameters->options().is_undefined(lsym->name()))
833 return true;
834 return false;
837 // Return TRUE if a defined symbol might be reachable from outside the
838 // load module.
840 static inline bool
841 is_visible_from_outside(Symbol* lsym)
843 if (lsym->in_dyn())
844 return true;
845 if (parameters->options().export_dynamic() || parameters->options().shared())
846 return lsym->is_externally_visible();
847 return false;
850 // Get symbol resolution info.
852 ld_plugin_status
853 Pluginobj::get_symbol_resolution_info(int nsyms,
854 ld_plugin_symbol* syms,
855 int version) const
857 // For version 1 of this interface, we cannot use
858 // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF
859 // instead.
860 const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp
861 = (version > 1
862 ? LDPR_PREVAILING_DEF_IRONLY_EXP
863 : LDPR_PREVAILING_DEF);
865 if (nsyms > this->nsyms_)
866 return LDPS_NO_SYMS;
868 if (static_cast<size_t>(nsyms) > this->symbols_.size())
870 // We never decided to include this object. We mark all symbols as
871 // preempted.
872 gold_assert(this->symbols_.size() == 0);
873 for (int i = 0; i < nsyms; i++)
874 syms[i].resolution = LDPR_PREEMPTED_REG;
875 return LDPS_OK;
878 for (int i = 0; i < nsyms; i++)
880 ld_plugin_symbol* isym = &syms[i];
881 Symbol* lsym = this->symbols_[i];
882 ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
884 if (lsym->is_undefined())
885 // The symbol remains undefined.
886 res = LDPR_UNDEF;
887 else if (isym->def == LDPK_UNDEF
888 || isym->def == LDPK_WEAKUNDEF
889 || isym->def == LDPK_COMMON)
891 // The original symbol was undefined or common.
892 if (lsym->source() != Symbol::FROM_OBJECT)
893 res = LDPR_RESOLVED_EXEC;
894 else if (lsym->object()->pluginobj() == this)
896 if (is_referenced_from_outside(lsym))
897 res = LDPR_PREVAILING_DEF;
898 else if (is_visible_from_outside(lsym))
899 res = ldpr_prevailing_def_ironly_exp;
900 else
901 res = LDPR_PREVAILING_DEF_IRONLY;
903 else if (lsym->object()->pluginobj() != NULL)
904 res = LDPR_RESOLVED_IR;
905 else if (lsym->object()->is_dynamic())
906 res = LDPR_RESOLVED_DYN;
907 else
908 res = LDPR_RESOLVED_EXEC;
910 else
912 // The original symbol was a definition.
913 if (lsym->source() != Symbol::FROM_OBJECT)
914 res = LDPR_PREEMPTED_REG;
915 else if (lsym->object() == static_cast<const Object*>(this))
917 if (is_referenced_from_outside(lsym))
918 res = LDPR_PREVAILING_DEF;
919 else if (is_visible_from_outside(lsym))
920 res = ldpr_prevailing_def_ironly_exp;
921 else
922 res = LDPR_PREVAILING_DEF_IRONLY;
924 else
925 res = (lsym->object()->pluginobj() != NULL
926 ? LDPR_PREEMPTED_IR
927 : LDPR_PREEMPTED_REG);
929 isym->resolution = res;
931 return LDPS_OK;
934 // Return TRUE if the comdat group with key COMDAT_KEY from this object
935 // should be kept.
937 bool
938 Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
940 std::pair<Comdat_map::iterator, bool> ins =
941 this->comdat_map_.insert(std::make_pair(comdat_key, false));
943 // If this is the first time we've seen this comdat key, ask the
944 // layout object whether it should be included.
945 if (ins.second)
946 ins.first->second = layout->find_or_add_kept_section(comdat_key,
947 NULL, 0, true,
948 true, NULL);
950 return ins.first->second;
953 // Class Sized_pluginobj.
955 template<int size, bool big_endian>
956 Sized_pluginobj<size, big_endian>::Sized_pluginobj(
957 const std::string& name,
958 Input_file* input_file,
959 off_t offset,
960 off_t filesize)
961 : Pluginobj(name, input_file, offset, filesize)
965 // Read the symbols. Not used for plugin objects.
967 template<int size, bool big_endian>
968 void
969 Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
971 gold_unreachable();
974 // Lay out the input sections. Not used for plugin objects.
976 template<int size, bool big_endian>
977 void
978 Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
979 Read_symbols_data*)
981 gold_unreachable();
984 // Add the symbols to the symbol table.
986 template<int size, bool big_endian>
987 void
988 Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
989 Read_symbols_data*,
990 Layout* layout)
992 const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
993 unsigned char symbuf[sym_size];
994 elfcpp::Sym<size, big_endian> sym(symbuf);
995 elfcpp::Sym_write<size, big_endian> osym(symbuf);
997 typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
999 this->symbols_.resize(this->nsyms_);
1001 for (int i = 0; i < this->nsyms_; ++i)
1003 const struct ld_plugin_symbol* isym = &this->syms_[i];
1004 const char* name = isym->name;
1005 const char* ver = isym->version;
1006 elfcpp::Elf_Half shndx;
1007 elfcpp::STB bind;
1008 elfcpp::STV vis;
1010 if (name != NULL && name[0] == '\0')
1011 name = NULL;
1012 if (ver != NULL && ver[0] == '\0')
1013 ver = NULL;
1015 switch (isym->def)
1017 case LDPK_WEAKDEF:
1018 case LDPK_WEAKUNDEF:
1019 bind = elfcpp::STB_WEAK;
1020 break;
1021 case LDPK_DEF:
1022 case LDPK_UNDEF:
1023 case LDPK_COMMON:
1024 default:
1025 bind = elfcpp::STB_GLOBAL;
1026 break;
1029 switch (isym->def)
1031 case LDPK_DEF:
1032 case LDPK_WEAKDEF:
1033 shndx = elfcpp::SHN_ABS;
1034 break;
1035 case LDPK_COMMON:
1036 shndx = elfcpp::SHN_COMMON;
1037 break;
1038 case LDPK_UNDEF:
1039 case LDPK_WEAKUNDEF:
1040 default:
1041 shndx = elfcpp::SHN_UNDEF;
1042 break;
1045 switch (isym->visibility)
1047 case LDPV_PROTECTED:
1048 vis = elfcpp::STV_PROTECTED;
1049 break;
1050 case LDPV_INTERNAL:
1051 vis = elfcpp::STV_INTERNAL;
1052 break;
1053 case LDPV_HIDDEN:
1054 vis = elfcpp::STV_HIDDEN;
1055 break;
1056 case LDPV_DEFAULT:
1057 default:
1058 vis = elfcpp::STV_DEFAULT;
1059 break;
1062 if (isym->comdat_key != NULL
1063 && isym->comdat_key[0] != '\0'
1064 && !this->include_comdat_group(isym->comdat_key, layout))
1065 shndx = elfcpp::SHN_UNDEF;
1067 osym.put_st_name(0);
1068 osym.put_st_value(0);
1069 osym.put_st_size(static_cast<Elf_size_type>(isym->size));
1070 osym.put_st_info(bind, elfcpp::STT_NOTYPE);
1071 osym.put_st_other(vis, 0);
1072 osym.put_st_shndx(shndx);
1074 this->symbols_[i] =
1075 symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
1079 template<int size, bool big_endian>
1080 Archive::Should_include
1081 Sized_pluginobj<size, big_endian>::do_should_include_member(
1082 Symbol_table* symtab,
1083 Layout* layout,
1084 Read_symbols_data*,
1085 std::string* why)
1087 char* tmpbuf = NULL;
1088 size_t tmpbuflen = 0;
1090 for (int i = 0; i < this->nsyms_; ++i)
1092 const struct ld_plugin_symbol& sym = this->syms_[i];
1093 const char* name = sym.name;
1094 Symbol* symbol;
1095 Archive::Should_include t = Archive::should_include_member(symtab,
1096 layout,
1097 name,
1098 &symbol, why,
1099 &tmpbuf,
1100 &tmpbuflen);
1101 if (t == Archive::SHOULD_INCLUDE_YES)
1103 if (tmpbuf != NULL)
1104 free(tmpbuf);
1105 return t;
1108 if (tmpbuf != NULL)
1109 free(tmpbuf);
1110 return Archive::SHOULD_INCLUDE_UNKNOWN;
1113 // Iterate over global symbols, calling a visitor class V for each.
1115 template<int size, bool big_endian>
1116 void
1117 Sized_pluginobj<size, big_endian>::do_for_all_global_symbols(
1118 Read_symbols_data*,
1119 Library_base::Symbol_visitor_base* v)
1121 for (int i = 0; i < this->nsyms_; ++i)
1123 const struct ld_plugin_symbol& sym = this->syms_[i];
1124 if (sym.def != LDPK_UNDEF)
1125 v->visit(sym.name);
1129 // Iterate over local symbols, calling a visitor class V for each GOT offset
1130 // associated with a local symbol.
1131 template<int size, bool big_endian>
1132 void
1133 Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries(
1134 Got_offset_list::Visitor*) const
1136 gold_unreachable();
1139 // Get the size of a section. Not used for plugin objects.
1141 template<int size, bool big_endian>
1142 uint64_t
1143 Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
1145 gold_unreachable();
1146 return 0;
1149 // Get the name of a section. Not used for plugin objects.
1151 template<int size, bool big_endian>
1152 std::string
1153 Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
1155 gold_unreachable();
1156 return std::string();
1159 // Return a view of the contents of a section. Not used for plugin objects.
1161 template<int size, bool big_endian>
1162 Object::Location
1163 Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
1165 Location loc(0, 0);
1167 gold_unreachable();
1168 return loc;
1171 // Return section flags. Not used for plugin objects.
1173 template<int size, bool big_endian>
1174 uint64_t
1175 Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
1177 gold_unreachable();
1178 return 0;
1181 // Return section entsize. Not used for plugin objects.
1183 template<int size, bool big_endian>
1184 uint64_t
1185 Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
1187 gold_unreachable();
1188 return 0;
1191 // Return section address. Not used for plugin objects.
1193 template<int size, bool big_endian>
1194 uint64_t
1195 Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
1197 gold_unreachable();
1198 return 0;
1201 // Return section type. Not used for plugin objects.
1203 template<int size, bool big_endian>
1204 unsigned int
1205 Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
1207 gold_unreachable();
1208 return 0;
1211 // Return the section link field. Not used for plugin objects.
1213 template<int size, bool big_endian>
1214 unsigned int
1215 Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
1217 gold_unreachable();
1218 return 0;
1221 // Return the section link field. Not used for plugin objects.
1223 template<int size, bool big_endian>
1224 unsigned int
1225 Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
1227 gold_unreachable();
1228 return 0;
1231 // Return the section alignment. Not used for plugin objects.
1233 template<int size, bool big_endian>
1234 uint64_t
1235 Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
1237 gold_unreachable();
1238 return 0;
1241 // Return the Xindex structure to use. Not used for plugin objects.
1243 template<int size, bool big_endian>
1244 Xindex*
1245 Sized_pluginobj<size, big_endian>::do_initialize_xindex()
1247 gold_unreachable();
1248 return NULL;
1251 // Get symbol counts. Don't count plugin objects; the replacement
1252 // files will provide the counts.
1254 template<int size, bool big_endian>
1255 void
1256 Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(
1257 const Symbol_table*,
1258 size_t* defined,
1259 size_t* used) const
1261 *defined = 0;
1262 *used = 0;
1265 // Get symbols. Not used for plugin objects.
1267 template<int size, bool big_endian>
1268 const Object::Symbols*
1269 Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
1271 gold_unreachable();
1274 // Class Plugin_finish. This task runs after all replacement files have
1275 // been added. For now, it's a placeholder for a possible plugin API
1276 // to allow the plugin to release most of its resources. The cleanup
1277 // handlers must be called later, because they can remove the temporary
1278 // object files that are needed until the end of the link.
1280 class Plugin_finish : public Task
1282 public:
1283 Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
1284 : this_blocker_(this_blocker), next_blocker_(next_blocker)
1287 ~Plugin_finish()
1289 if (this->this_blocker_ != NULL)
1290 delete this->this_blocker_;
1293 Task_token*
1294 is_runnable()
1296 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1297 return this->this_blocker_;
1298 return NULL;
1301 void
1302 locks(Task_locker* tl)
1303 { tl->add(this, this->next_blocker_); }
1305 void
1306 run(Workqueue*)
1308 // We could call early cleanup handlers here.
1311 std::string
1312 get_name() const
1313 { return "Plugin_finish"; }
1315 private:
1316 Task_token* this_blocker_;
1317 Task_token* next_blocker_;
1320 // Class Plugin_hook.
1322 Plugin_hook::~Plugin_hook()
1326 // Return whether a Plugin_hook task is runnable.
1328 Task_token*
1329 Plugin_hook::is_runnable()
1331 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1332 return this->this_blocker_;
1333 return NULL;
1336 // Return a Task_locker for a Plugin_hook task. We don't need any
1337 // locks here.
1339 void
1340 Plugin_hook::locks(Task_locker*)
1344 // Run the "all symbols read" plugin hook.
1346 void
1347 Plugin_hook::run(Workqueue* workqueue)
1349 gold_assert(this->options_.has_plugins());
1350 Symbol* start_sym = this->symtab_->lookup(parameters->entry());
1351 if (start_sym != NULL)
1352 start_sym->set_in_real_elf();
1354 this->options_.plugins()->all_symbols_read(workqueue,
1355 this,
1356 this->input_objects_,
1357 this->symtab_,
1358 this->dirpath_,
1359 this->mapfile_,
1360 &this->this_blocker_);
1361 workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
1362 this->next_blocker_));
1365 // The C interface routines called by the plugins.
1367 #ifdef ENABLE_PLUGINS
1369 // Register a claim-file handler.
1371 static enum ld_plugin_status
1372 register_claim_file(ld_plugin_claim_file_handler handler)
1374 gold_assert(parameters->options().has_plugins());
1375 parameters->options().plugins()->set_claim_file_handler(handler);
1376 return LDPS_OK;
1379 // Register an all-symbols-read handler.
1381 static enum ld_plugin_status
1382 register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
1384 gold_assert(parameters->options().has_plugins());
1385 parameters->options().plugins()->set_all_symbols_read_handler(handler);
1386 return LDPS_OK;
1389 // Register a cleanup handler.
1391 static enum ld_plugin_status
1392 register_cleanup(ld_plugin_cleanup_handler handler)
1394 gold_assert(parameters->options().has_plugins());
1395 parameters->options().plugins()->set_cleanup_handler(handler);
1396 return LDPS_OK;
1399 // Add symbols from a plugin-claimed input file.
1401 static enum ld_plugin_status
1402 add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms)
1404 gold_assert(parameters->options().has_plugins());
1405 Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
1406 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1407 if (obj == NULL)
1408 return LDPS_ERR;
1409 obj->store_incoming_symbols(nsyms, syms);
1410 return LDPS_OK;
1413 // Get the input file information with an open (possibly re-opened)
1414 // file descriptor.
1416 static enum ld_plugin_status
1417 get_input_file(const void* handle, struct ld_plugin_input_file* file)
1419 gold_assert(parameters->options().has_plugins());
1420 unsigned int obj_index =
1421 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1422 return parameters->options().plugins()->get_input_file(obj_index, file);
1425 // Release the input file.
1427 static enum ld_plugin_status
1428 release_input_file(const void* handle)
1430 gold_assert(parameters->options().has_plugins());
1431 unsigned int obj_index =
1432 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1433 return parameters->options().plugins()->release_input_file(obj_index);
1436 static enum ld_plugin_status
1437 get_view(const void *handle, const void **viewp)
1439 gold_assert(parameters->options().has_plugins());
1440 unsigned int obj_index =
1441 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
1442 return parameters->options().plugins()->get_view(obj_index, viewp);
1445 // Get the symbol resolution info for a plugin-claimed input file.
1447 static enum ld_plugin_status
1448 get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms)
1450 gold_assert(parameters->options().has_plugins());
1451 Object* obj = parameters->options().plugins()->object(
1452 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1453 if (obj == NULL)
1454 return LDPS_ERR;
1455 Pluginobj* plugin_obj = obj->pluginobj();
1456 if (plugin_obj == NULL)
1457 return LDPS_ERR;
1458 return plugin_obj->get_symbol_resolution_info(nsyms, syms, 1);
1461 // Version 2 of the above. The only difference is that this version
1462 // is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP.
1464 static enum ld_plugin_status
1465 get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms)
1467 gold_assert(parameters->options().has_plugins());
1468 Object* obj = parameters->options().plugins()->object(
1469 static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
1470 if (obj == NULL)
1471 return LDPS_ERR;
1472 Pluginobj* plugin_obj = obj->pluginobj();
1473 if (plugin_obj == NULL)
1474 return LDPS_ERR;
1475 return plugin_obj->get_symbol_resolution_info(nsyms, syms, 2);
1478 // Add a new (real) input file generated by a plugin.
1480 static enum ld_plugin_status
1481 add_input_file(const char* pathname)
1483 gold_assert(parameters->options().has_plugins());
1484 return parameters->options().plugins()->add_input_file(pathname, false);
1487 // Add a new (real) library required by a plugin.
1489 static enum ld_plugin_status
1490 add_input_library(const char* pathname)
1492 gold_assert(parameters->options().has_plugins());
1493 return parameters->options().plugins()->add_input_file(pathname, true);
1496 // Set the extra library path to be used by libraries added via
1497 // add_input_library
1499 static enum ld_plugin_status
1500 set_extra_library_path(const char* path)
1502 gold_assert(parameters->options().has_plugins());
1503 return parameters->options().plugins()->set_extra_library_path(path);
1506 // Issue a diagnostic message from a plugin.
1508 static enum ld_plugin_status
1509 message(int level, const char* format, ...)
1511 va_list args;
1512 va_start(args, format);
1514 switch (level)
1516 case LDPL_INFO:
1517 parameters->errors()->info(format, args);
1518 break;
1519 case LDPL_WARNING:
1520 parameters->errors()->warning(format, args);
1521 break;
1522 case LDPL_ERROR:
1523 default:
1524 parameters->errors()->error(format, args);
1525 break;
1526 case LDPL_FATAL:
1527 parameters->errors()->fatal(format, args);
1528 break;
1531 va_end(args);
1532 return LDPS_OK;
1535 // Get the section count of the object corresponding to the handle. This
1536 // plugin interface can only be called in the claim_file handler of the plugin.
1538 static enum ld_plugin_status
1539 get_input_section_count(const void* handle, unsigned int* count)
1541 gold_assert(parameters->options().has_plugins());
1543 if (!parameters->options().plugins()->in_claim_file_handler())
1544 return LDPS_ERR;
1546 Object* obj = parameters->options().plugins()->get_elf_object(handle);
1548 if (obj == NULL)
1549 return LDPS_ERR;
1551 *count = obj->shnum();
1552 return LDPS_OK;
1555 // Get the type of the specified section in the object corresponding
1556 // to the handle. This plugin interface can only be called in the
1557 // claim_file handler of the plugin.
1559 static enum ld_plugin_status
1560 get_input_section_type(const struct ld_plugin_section section,
1561 unsigned int* type)
1563 gold_assert(parameters->options().has_plugins());
1565 if (!parameters->options().plugins()->in_claim_file_handler())
1566 return LDPS_ERR;
1568 Object* obj
1569 = parameters->options().plugins()->get_elf_object(section.handle);
1571 if (obj == NULL)
1572 return LDPS_BAD_HANDLE;
1574 *type = obj->section_type(section.shndx);
1575 return LDPS_OK;
1578 // Get the name of the specified section in the object corresponding
1579 // to the handle. This plugin interface can only be called in the
1580 // claim_file handler of the plugin.
1582 static enum ld_plugin_status
1583 get_input_section_name(const struct ld_plugin_section section,
1584 char** section_name_ptr)
1586 gold_assert(parameters->options().has_plugins());
1588 if (!parameters->options().plugins()->in_claim_file_handler())
1589 return LDPS_ERR;
1591 Object* obj
1592 = parameters->options().plugins()->get_elf_object(section.handle);
1594 if (obj == NULL)
1595 return LDPS_BAD_HANDLE;
1597 // Check if the object is locked before getting the section name.
1598 gold_assert(obj->is_locked());
1600 const std::string section_name = obj->section_name(section.shndx);
1601 *section_name_ptr = static_cast<char*>(malloc(section_name.length() + 1));
1602 memcpy(*section_name_ptr, section_name.c_str(), section_name.length() + 1);
1603 return LDPS_OK;
1606 // Get the contents of the specified section in the object corresponding
1607 // to the handle. This plugin interface can only be called in the
1608 // claim_file handler of the plugin.
1610 static enum ld_plugin_status
1611 get_input_section_contents(const struct ld_plugin_section section,
1612 const unsigned char** section_contents_ptr,
1613 size_t* len)
1615 gold_assert(parameters->options().has_plugins());
1617 if (!parameters->options().plugins()->in_claim_file_handler())
1618 return LDPS_ERR;
1620 Object* obj
1621 = parameters->options().plugins()->get_elf_object(section.handle);
1623 if (obj == NULL)
1624 return LDPS_BAD_HANDLE;
1626 // Check if the object is locked before getting the section contents.
1627 gold_assert(obj->is_locked());
1629 section_size_type plen;
1630 *section_contents_ptr
1631 = obj->section_contents(section.shndx, &plen, false);
1632 *len = plen;
1633 return LDPS_OK;
1636 // Specify the ordering of sections in the final layout. The sections are
1637 // specified as (handle,shndx) pairs in the two arrays in the order in
1638 // which they should appear in the final layout.
1640 static enum ld_plugin_status
1641 update_section_order(const struct ld_plugin_section* section_list,
1642 unsigned int num_sections)
1644 gold_assert(parameters->options().has_plugins());
1646 if (num_sections == 0)
1647 return LDPS_OK;
1649 if (section_list == NULL)
1650 return LDPS_ERR;
1652 Layout* layout = parameters->options().plugins()->layout();
1653 gold_assert (layout != NULL);
1655 std::map<Section_id, unsigned int>* order_map
1656 = layout->get_section_order_map();
1658 /* Store the mapping from Section_id to section position in layout's
1659 order_map to consult after output sections are added. */
1660 for (unsigned int i = 0; i < num_sections; ++i)
1662 Object* obj = parameters->options().plugins()->get_elf_object(
1663 section_list[i].handle);
1664 if (obj == NULL)
1665 return LDPS_BAD_HANDLE;
1666 unsigned int shndx = section_list[i].shndx;
1667 Section_id secn_id(obj, shndx);
1668 (*order_map)[secn_id] = i + 1;
1671 return LDPS_OK;
1674 // Let the linker know that the sections could be reordered.
1676 static enum ld_plugin_status
1677 allow_section_ordering()
1679 gold_assert(parameters->options().has_plugins());
1680 Layout* layout = parameters->options().plugins()->layout();
1681 layout->set_section_ordering_specified();
1682 return LDPS_OK;
1685 #endif // ENABLE_PLUGINS
1687 // Allocate a Pluginobj object of the appropriate size and endianness.
1689 static Pluginobj*
1690 make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
1692 Pluginobj* obj = NULL;
1694 parameters_force_valid_target();
1695 const Target& target(parameters->target());
1697 if (target.get_size() == 32)
1699 if (target.is_big_endian())
1700 #ifdef HAVE_TARGET_32_BIG
1701 obj = new Sized_pluginobj<32, true>(input_file->filename(),
1702 input_file, offset, filesize);
1703 #else
1704 gold_error(_("%s: not configured to support "
1705 "32-bit big-endian object"),
1706 input_file->filename().c_str());
1707 #endif
1708 else
1709 #ifdef HAVE_TARGET_32_LITTLE
1710 obj = new Sized_pluginobj<32, false>(input_file->filename(),
1711 input_file, offset, filesize);
1712 #else
1713 gold_error(_("%s: not configured to support "
1714 "32-bit little-endian object"),
1715 input_file->filename().c_str());
1716 #endif
1718 else if (target.get_size() == 64)
1720 if (target.is_big_endian())
1721 #ifdef HAVE_TARGET_64_BIG
1722 obj = new Sized_pluginobj<64, true>(input_file->filename(),
1723 input_file, offset, filesize);
1724 #else
1725 gold_error(_("%s: not configured to support "
1726 "64-bit big-endian object"),
1727 input_file->filename().c_str());
1728 #endif
1729 else
1730 #ifdef HAVE_TARGET_64_LITTLE
1731 obj = new Sized_pluginobj<64, false>(input_file->filename(),
1732 input_file, offset, filesize);
1733 #else
1734 gold_error(_("%s: not configured to support "
1735 "64-bit little-endian object"),
1736 input_file->filename().c_str());
1737 #endif
1740 gold_assert(obj != NULL);
1741 return obj;
1744 } // End namespace gold.