Merge branch 'vendor/GCC50'
[dragonfly.git] / contrib / binutils-2.25 / gold / archive.cc
1 // archive.cc -- archive support for gold
2
3 // Copyright (C) 2006-2014 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
5
6 // This file is part of gold.
7
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.
12
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.
17
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.
22
23 #include "gold.h"
24
25 #include <cerrno>
26 #include <cstring>
27 #include <climits>
28 #include <vector>
29 #include "libiberty.h"
30 #include "filenames.h"
31
32 #include "elfcpp.h"
33 #include "options.h"
34 #include "mapfile.h"
35 #include "fileread.h"
36 #include "readsyms.h"
37 #include "symtab.h"
38 #include "object.h"
39 #include "layout.h"
40 #include "archive.h"
41 #include "plugin.h"
42 #include "incremental.h"
43
44 namespace gold
45 {
46
47 // Library_base methods.
48
49 // Determine whether a definition of SYM_NAME should cause an archive
50 // library member to be included in the link.  Returns SHOULD_INCLUDE_YES
51 // if the symbol is referenced but not defined, SHOULD_INCLUDE_NO if the
52 // symbol is already defined, and SHOULD_INCLUDE_UNKNOWN if the symbol is
53 // neither referenced nor defined.
54
55 Library_base::Should_include
56 Library_base::should_include_member(Symbol_table* symtab, Layout* layout,
57                                     const char* sym_name, Symbol** symp,
58                                     std::string* why, char** tmpbufp,
59                                     size_t* tmpbuflen)
60 {
61   // In an object file, and therefore in an archive map, an
62   // '@' in the name separates the symbol name from the
63   // version name.  If there are two '@' characters, this is
64   // the default version.
65   char* tmpbuf = *tmpbufp;
66   const char* ver = strchr(sym_name, '@');
67   bool def = false;
68   if (ver != NULL)
69     {
70       size_t symlen = ver - sym_name;
71       if (symlen + 1 > *tmpbuflen)
72         {
73           tmpbuf = static_cast<char*>(xrealloc(tmpbuf, symlen + 1));
74           *tmpbufp = tmpbuf;
75           *tmpbuflen = symlen + 1;
76         }
77       memcpy(tmpbuf, sym_name, symlen);
78       tmpbuf[symlen] = '\0';
79       sym_name = tmpbuf;
80
81       ++ver;
82       if (*ver == '@')
83         {
84           ++ver;
85           def = true;
86         }
87     }
88
89   Symbol* sym = symtab->lookup(sym_name, ver);
90   if (def
91       && ver != NULL
92       && (sym == NULL
93           || !sym->is_undefined()
94           || sym->binding() == elfcpp::STB_WEAK))
95     sym = symtab->lookup(sym_name, NULL);
96
97   *symp = sym;
98
99   if (sym != NULL)
100     {
101       if (!sym->is_undefined())
102         return Library_base::SHOULD_INCLUDE_NO;
103
104       // PR 12001: Do not include an archive when the undefined
105       // symbol has actually been defined on the command line.
106       if (layout->script_options()->is_pending_assignment(sym_name))
107         return Library_base::SHOULD_INCLUDE_NO;
108
109       // If the symbol is weak undefined, we still need to check
110       // for other reasons (like a -u option).
111       if (sym->binding() != elfcpp::STB_WEAK)
112         return Library_base::SHOULD_INCLUDE_YES;
113     }
114
115   // Check whether the symbol was named in a -u option.
116   if (parameters->options().is_undefined(sym_name))
117     {
118       *why = "-u ";
119       *why += sym_name;
120       return Library_base::SHOULD_INCLUDE_YES;
121     }
122
123   if (parameters->options().is_export_dynamic_symbol(sym_name))
124     {
125       *why = "--export-dynamic-symbol ";
126       *why += sym_name;
127       return Library_base::SHOULD_INCLUDE_YES;
128     }
129
130   if (layout->script_options()->is_referenced(sym_name))
131     {
132       size_t alc = 100 + strlen(sym_name);
133       char* buf = new char[alc];
134       snprintf(buf, alc, _("script or expression reference to %s"),
135                sym_name);
136       *why = buf;
137       delete[] buf;
138       return Library_base::SHOULD_INCLUDE_YES;
139     }
140
141   if (strcmp(sym_name, parameters->entry()) == 0)
142     {
143       *why = "entry symbol ";
144       *why += sym_name;
145       return Library_base::SHOULD_INCLUDE_YES;
146     }
147
148   return Library_base::SHOULD_INCLUDE_UNKNOWN;
149 }
150
151 // The header of an entry in the archive.  This is all readable text,
152 // padded with spaces where necessary.  If the contents of an archive
153 // are all text file, the entire archive is readable.
154
155 struct Archive::Archive_header
156 {
157   // The entry name.
158   char ar_name[16];
159   // The file modification time.
160   char ar_date[12];
161   // The user's UID in decimal.
162   char ar_uid[6];
163   // The user's GID in decimal.
164   char ar_gid[6];
165   // The file mode in octal.
166   char ar_mode[8];
167   // The file size in decimal.
168   char ar_size[10];
169   // The final magic code.
170   char ar_fmag[2];
171 };
172
173 // Class Archive static variables.
174 unsigned int Archive::total_archives;
175 unsigned int Archive::total_members;
176 unsigned int Archive::total_members_loaded;
177
178 // Archive methods.
179
180 const char Archive::armag[sarmag] =
181 {
182   '!', '<', 'a', 'r', 'c', 'h', '>', '\n'
183 };
184
185 const char Archive::armagt[sarmag] =
186 {
187   '!', '<', 't', 'h', 'i', 'n', '>', '\n'
188 };
189
190 const char Archive::arfmag[2] = { '`', '\n' };
191
192 Archive::Archive(const std::string& name, Input_file* input_file,
193                  bool is_thin_archive, Dirsearch* dirpath, Task* task)
194   : Library_base(task), name_(name), input_file_(input_file), armap_(),
195     armap_names_(), extended_names_(), armap_checked_(), seen_offsets_(),
196     members_(), is_thin_archive_(is_thin_archive), included_member_(false),
197     nested_archives_(), dirpath_(dirpath), num_members_(0),
198     included_all_members_(false)
199 {
200   this->no_export_ =
201     parameters->options().check_excluded_libs(input_file->found_name());
202 }
203
204 // Set up the archive: read the symbol map and the extended name
205 // table.
206
207 void
208 Archive::setup()
209 {
210   // We need to ignore empty archives.
211   if (this->input_file_->file().filesize() == sarmag)
212     return;
213
214   // The first member of the archive should be the symbol table.
215   std::string armap_name;
216   off_t header_size = this->read_header(sarmag, false, &armap_name, NULL);
217   if (header_size == -1)
218     return;
219
220   section_size_type armap_size = convert_to_section_size_type(header_size);
221   off_t off = sarmag;
222   if (armap_name.empty())
223     {
224       this->read_armap(sarmag + sizeof(Archive_header), armap_size);
225       off = sarmag + sizeof(Archive_header) + armap_size;
226     }
227   else if (!this->input_file_->options().whole_archive())
228     gold_error(_("%s: no archive symbol table (run ranlib)"),
229                this->name().c_str());
230
231   // See if there is an extended name table.  We cache these views
232   // because it is likely that we will want to read the following
233   // header in the add_symbols routine.
234   if ((off & 1) != 0)
235     ++off;
236   std::string xname;
237   header_size = this->read_header(off, true, &xname, NULL);
238   if (header_size == -1)
239     return;
240
241   section_size_type extended_size = convert_to_section_size_type(header_size);
242   if (xname == "/")
243     {
244       const unsigned char* p = this->get_view(off + sizeof(Archive_header),
245                                               extended_size, false, true);
246       const char* px = reinterpret_cast<const char*>(p);
247       this->extended_names_.assign(px, extended_size);
248     }
249   bool preread_syms = (parameters->options().threads()
250                        && parameters->options().preread_archive_symbols());
251 #ifndef ENABLE_THREADS
252   preread_syms = false;
253 #else
254   if (parameters->options().has_plugins())
255     preread_syms = false;
256 #endif
257   if (preread_syms)
258     this->read_all_symbols();
259 }
260
261 // Unlock any nested archives.
262
263 void
264 Archive::unlock_nested_archives()
265 {
266   for (Nested_archive_table::iterator p = this->nested_archives_.begin();
267        p != this->nested_archives_.end();
268        ++p)
269     {
270       p->second->unlock(this->task_);
271     }
272 }
273
274 // Read the archive symbol map.
275
276 void
277 Archive::read_armap(off_t start, section_size_type size)
278 {
279   // To count the total number of archive members, we'll just count
280   // the number of times the file offset changes.  Since most archives
281   // group the symbols in the armap by object, this ought to give us
282   // an accurate count.
283   off_t last_seen_offset = -1;
284
285   // Read in the entire armap.
286   const unsigned char* p = this->get_view(start, size, true, false);
287
288   // Numbers in the armap are always big-endian.
289   const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
290   unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
291   ++pword;
292
293   // Note that the addition is in units of sizeof(elfcpp::Elf_Word).
294   const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
295   section_size_type names_size =
296     reinterpret_cast<const char*>(p) + size - pnames;
297   this->armap_names_.assign(pnames, names_size);
298
299   this->armap_.resize(nsyms);
300
301   section_offset_type name_offset = 0;
302   for (unsigned int i = 0; i < nsyms; ++i)
303     {
304       this->armap_[i].name_offset = name_offset;
305       this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
306       name_offset += strlen(pnames + name_offset) + 1;
307       ++pword;
308       if (this->armap_[i].file_offset != last_seen_offset)
309         {
310           last_seen_offset = this->armap_[i].file_offset;
311           ++this->num_members_;
312         }
313     }
314
315   if (static_cast<section_size_type>(name_offset) > names_size)
316     gold_error(_("%s: bad archive symbol table names"),
317                this->name().c_str());
318
319   // This array keeps track of which symbols are for archive elements
320   // which we have already included in the link.
321   this->armap_checked_.resize(nsyms);
322 }
323
324 // Read the header of an archive member at OFF.  Fail if something
325 // goes wrong.  Return the size of the member.  Set *PNAME to the name
326 // of the member.
327
328 off_t
329 Archive::read_header(off_t off, bool cache, std::string* pname,
330                      off_t* nested_off)
331 {
332   const unsigned char* p = this->get_view(off, sizeof(Archive_header), true,
333                                           cache);
334   const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
335   return this->interpret_header(hdr, off,  pname, nested_off);
336 }
337
338 // Interpret the header of HDR, the header of the archive member at
339 // file offset OFF.  Return the size of the member, or -1 if something
340 // has gone wrong.  Set *PNAME to the name of the member.
341
342 off_t
343 Archive::interpret_header(const Archive_header* hdr, off_t off,
344                           std::string* pname, off_t* nested_off) const
345 {
346   if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
347     {
348       gold_error(_("%s: malformed archive header at %zu"),
349                  this->name().c_str(), static_cast<size_t>(off));
350       return -1;
351     }
352
353   const int size_string_size = sizeof hdr->ar_size;
354   char size_string[size_string_size + 1];
355   memcpy(size_string, hdr->ar_size, size_string_size);
356   char* ps = size_string + size_string_size;
357   while (ps[-1] == ' ')
358     --ps;
359   *ps = '\0';
360
361   errno = 0;
362   char* end;
363   off_t member_size = strtol(size_string, &end, 10);
364   if (*end != '\0'
365       || member_size < 0
366       || (member_size == LONG_MAX && errno == ERANGE))
367     {
368       gold_error(_("%s: malformed archive header size at %zu"),
369                  this->name().c_str(), static_cast<size_t>(off));
370       return -1;
371     }
372
373   if (hdr->ar_name[0] != '/')
374     {
375       const char* name_end = strchr(hdr->ar_name, '/');
376       if (name_end == NULL
377           || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
378         {
379           gold_error(_("%s: malformed archive header name at %zu"),
380                      this->name().c_str(), static_cast<size_t>(off));
381           return -1;
382         }
383       pname->assign(hdr->ar_name, name_end - hdr->ar_name);
384       if (nested_off != NULL)
385         *nested_off = 0;
386     }
387   else if (hdr->ar_name[1] == ' ')
388     {
389       // This is the symbol table.
390       if (!pname->empty())
391         pname->clear();
392     }
393   else if (hdr->ar_name[1] == '/')
394     {
395       // This is the extended name table.
396       pname->assign(1, '/');
397     }
398   else
399     {
400       errno = 0;
401       long x = strtol(hdr->ar_name + 1, &end, 10);
402       long y = 0;
403       if (*end == ':')
404         y = strtol(end + 1, &end, 10);
405       if (*end != ' '
406           || x < 0
407           || (x == LONG_MAX && errno == ERANGE)
408           || static_cast<size_t>(x) >= this->extended_names_.size())
409         {
410           gold_error(_("%s: bad extended name index at %zu"),
411                      this->name().c_str(), static_cast<size_t>(off));
412           return -1;
413         }
414
415       const char* name = this->extended_names_.data() + x;
416       const char* name_end = strchr(name, '\n');
417       if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
418           || name_end[-1] != '/')
419         {
420           gold_error(_("%s: bad extended name entry at header %zu"),
421                      this->name().c_str(), static_cast<size_t>(off));
422           return -1;
423         }
424       pname->assign(name, name_end - 1 - name);
425       if (nested_off != NULL)
426         *nested_off = y;
427     }
428
429   return member_size;
430 }
431
432 // An archive member iterator.
433
434 class Archive::const_iterator
435 {
436  public:
437   // The header of an archive member.  This is what this iterator
438   // points to.
439   struct Header
440   {
441     // The name of the member.
442     std::string name;
443     // The file offset of the member.
444     off_t off;
445     // The file offset of a nested archive member.
446     off_t nested_off;
447     // The size of the member.
448     off_t size;
449   };
450
451   const_iterator(Archive* archive, off_t off)
452     : archive_(archive), off_(off)
453   { this->read_next_header(); }
454
455   const Header&
456   operator*() const
457   { return this->header_; }
458
459   const Header*
460   operator->() const
461   { return &this->header_; }
462
463   const_iterator&
464   operator++()
465   {
466     if (this->off_ == this->archive_->file().filesize())
467       return *this;
468     this->off_ += sizeof(Archive_header);
469     if (!this->archive_->is_thin_archive())
470       this->off_ += this->header_.size;
471     if ((this->off_ & 1) != 0)
472       ++this->off_;
473     this->read_next_header();
474     return *this;
475   }
476
477   const_iterator
478   operator++(int)
479   {
480     const_iterator ret = *this;
481     ++*this;
482     return ret;
483   }
484
485   bool
486   operator==(const const_iterator p) const
487   { return this->off_ == p->off; }
488
489   bool
490   operator!=(const const_iterator p) const
491   { return this->off_ != p->off; }
492
493  private:
494   void
495   read_next_header();
496
497   // The underlying archive.
498   Archive* archive_;
499   // The current offset in the file.
500   off_t off_;
501   // The current archive header.
502   Header header_;
503 };
504
505 // Read the next archive header.
506
507 void
508 Archive::const_iterator::read_next_header()
509 {
510   off_t filesize = this->archive_->file().filesize();
511   while (true)
512     {
513       if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header)))
514         {
515           if (filesize != this->off_)
516             {
517               gold_error(_("%s: short archive header at %zu"),
518                          this->archive_->filename().c_str(),
519                          static_cast<size_t>(this->off_));
520               this->off_ = filesize;
521             }
522           this->header_.off = filesize;
523           return;
524         }
525
526       unsigned char buf[sizeof(Archive_header)];
527       this->archive_->file().read(this->off_, sizeof(Archive_header), buf);
528
529       const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf);
530       off_t size = this->archive_->interpret_header(hdr, this->off_,
531                                                     &this->header_.name,
532                                                     &this->header_.nested_off);
533       if (size == -1)
534         {
535           this->header_.off = filesize;
536           return;
537         }
538
539       this->header_.size = size;
540       this->header_.off = this->off_;
541
542       // Skip special members.
543       if (!this->header_.name.empty() && this->header_.name != "/")
544         return;
545
546       this->off_ += sizeof(Archive_header) + this->header_.size;
547       if ((this->off_ & 1) != 0)
548         ++this->off_;
549     }
550 }
551
552 // Initial iterator.
553
554 Archive::const_iterator
555 Archive::begin()
556 {
557   return Archive::const_iterator(this, sarmag);
558 }
559
560 // Final iterator.
561
562 Archive::const_iterator
563 Archive::end()
564 {
565   return Archive::const_iterator(this, this->input_file_->file().filesize());
566 }
567
568 // Get the file and offset for an archive member, which may be an
569 // external member of a thin archive.  Set *INPUT_FILE to the
570 // file containing the actual member, *MEMOFF to the offset
571 // within that file (0 if not a nested archive), and *MEMBER_NAME
572 // to the name of the archive member.  Return TRUE on success.
573
574 bool
575 Archive::get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff,
576                              off_t* memsize, std::string* member_name)
577 {
578   off_t nested_off;
579
580   *memsize = this->read_header(off, false, member_name, &nested_off);
581   if (*memsize == -1)
582     return false;
583
584   *input_file = this->input_file_;
585   *memoff = off + static_cast<off_t>(sizeof(Archive_header));
586
587   if (!this->is_thin_archive_)
588     return true;
589
590   // Adjust a relative pathname so that it is relative
591   // to the directory containing the archive.
592   if (!IS_ABSOLUTE_PATH(member_name->c_str()))
593     {
594       const char* arch_path = this->filename().c_str();
595       const char* basename = lbasename(arch_path);
596       if (basename > arch_path)
597         member_name->replace(0, 0,
598                              this->filename().substr(0, basename - arch_path));
599     }
600
601   if (nested_off > 0)
602     {
603       // This is a member of a nested archive.  Open the containing
604       // archive if we don't already have it open, then do a recursive
605       // call to include the member from that archive.
606       Archive* arch;
607       Nested_archive_table::const_iterator p =
608         this->nested_archives_.find(*member_name);
609       if (p != this->nested_archives_.end())
610         arch = p->second;
611       else
612         {
613           Input_file_argument* input_file_arg =
614             new Input_file_argument(member_name->c_str(),
615                                     Input_file_argument::INPUT_FILE_TYPE_FILE,
616                                     "", false, parameters->options());
617           *input_file = new Input_file(input_file_arg);
618           int dummy = 0;
619           if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
620             return false;
621           arch = new Archive(*member_name, *input_file, false, this->dirpath_,
622                              this->task_);
623           arch->setup();
624           std::pair<Nested_archive_table::iterator, bool> ins =
625             this->nested_archives_.insert(std::make_pair(*member_name, arch));
626           gold_assert(ins.second);
627         }
628       return arch->get_file_and_offset(nested_off, input_file, memoff,
629                                        memsize, member_name);
630     }
631
632   // This is an external member of a thin archive.  Open the
633   // file as a regular relocatable object file.
634   Input_file_argument* input_file_arg =
635       new Input_file_argument(member_name->c_str(),
636                               Input_file_argument::INPUT_FILE_TYPE_FILE,
637                               "", false, this->input_file_->options());
638   *input_file = new Input_file(input_file_arg);
639   int dummy = 0;
640   if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
641     return false;
642
643   *memoff = 0;
644   *memsize = (*input_file)->file().filesize();
645   return true;
646 }
647
648 // Return an ELF object for the member at offset OFF.  If
649 // PUNCONFIGURED is not NULL, then if the ELF object has an
650 // unsupported target type, set *PUNCONFIGURED to true and return
651 // NULL.
652
653 Object*
654 Archive::get_elf_object_for_member(off_t off, bool* punconfigured)
655 {
656   if (punconfigured != NULL)
657     *punconfigured = false;
658
659   Input_file* input_file;
660   off_t memoff;
661   off_t memsize;
662   std::string member_name;
663   if (!this->get_file_and_offset(off, &input_file, &memoff, &memsize,
664                                  &member_name))
665     return NULL;
666
667   const unsigned char* ehdr;
668   int read_size;
669   Object *obj = NULL;
670   bool is_elf_obj = false;
671
672   if (is_elf_object(input_file, memoff, &ehdr, &read_size))
673     {
674       obj = make_elf_object((std::string(this->input_file_->filename())
675                              + "(" + member_name + ")"),
676                             input_file, memoff, ehdr, read_size,
677                             punconfigured);
678       is_elf_obj = true;
679     }
680
681   if (parameters->options().has_plugins())
682     {
683       Object* plugin_obj
684         = parameters->options().plugins()->claim_file(input_file,
685                                                       memoff,
686                                                       memsize,
687                                                       obj);
688       if (plugin_obj != NULL)
689         {
690           // The input file was claimed by a plugin, and its symbols
691           // have been provided by the plugin.
692           // Delete its elf object.
693           if (obj != NULL)
694             delete obj;
695           return plugin_obj;
696         }
697     }
698
699   if (!is_elf_obj)
700     {
701       gold_error(_("%s: member at %zu is not an ELF object"),
702                  this->name().c_str(), static_cast<size_t>(off));
703       return NULL;
704     }
705
706   if (obj == NULL)
707     return NULL;
708   obj->set_no_export(this->no_export());
709   return obj;
710 }
711
712 // Read the symbols from all the archive members in the link.
713
714 void
715 Archive::read_all_symbols()
716 {
717   for (Archive::const_iterator p = this->begin();
718        p != this->end();
719        ++p)
720     this->read_symbols(p->off);
721 }
722
723 // Read the symbols from an archive member in the link.  OFF is the file
724 // offset of the member header.
725
726 void
727 Archive::read_symbols(off_t off)
728 {
729   Object* obj = this->get_elf_object_for_member(off, NULL);
730   if (obj == NULL)
731     return;
732
733   Read_symbols_data* sd = new Read_symbols_data;
734   obj->read_symbols(sd);
735   Archive_member member(obj, sd);
736   this->members_[off] = member;
737 }
738
739 // Select members from the archive and add them to the link.  We walk
740 // through the elements in the archive map, and look each one up in
741 // the symbol table.  If it exists as a strong undefined symbol, we
742 // pull in the corresponding element.  We have to do this in a loop,
743 // since pulling in one element may create new undefined symbols which
744 // may be satisfied by other objects in the archive.  Return true in
745 // the normal case, false if the first member we tried to add from
746 // this archive had an incompatible target.
747
748 bool
749 Archive::add_symbols(Symbol_table* symtab, Layout* layout,
750                      Input_objects* input_objects, Mapfile* mapfile)
751 {
752   ++Archive::total_archives;
753
754   if (this->input_file_->options().whole_archive())
755     return this->include_all_members(symtab, layout, input_objects,
756                                      mapfile);
757
758   Archive::total_members += this->num_members_;
759
760   input_objects->archive_start(this);
761
762   const size_t armap_size = this->armap_.size();
763
764   // This is a quick optimization, since we usually see many symbols
765   // in a row with the same offset.  last_seen_offset holds the last
766   // offset we saw that was present in the seen_offsets_ set.
767   off_t last_seen_offset = -1;
768
769   // Track which symbols in the symbol table we've already found to be
770   // defined.
771
772   char* tmpbuf = NULL;
773   size_t tmpbuflen = 0;
774   bool added_new_object;
775   do
776     {
777       added_new_object = false;
778       for (size_t i = 0; i < armap_size; ++i)
779         {
780           if (this->armap_checked_[i])
781             continue;
782           if (this->armap_[i].file_offset == last_seen_offset)
783             {
784               this->armap_checked_[i] = true;
785               continue;
786             }
787           if (this->seen_offsets_.find(this->armap_[i].file_offset)
788               != this->seen_offsets_.end())
789             {
790               this->armap_checked_[i] = true;
791               last_seen_offset = this->armap_[i].file_offset;
792               continue;
793             }
794
795           const char* sym_name = (this->armap_names_.data()
796                                   + this->armap_[i].name_offset);
797
798           Symbol* sym;
799           std::string why;
800           Archive::Should_include t =
801             Archive::should_include_member(symtab, layout, sym_name, &sym,
802                                            &why, &tmpbuf, &tmpbuflen);
803
804           if (t == Archive::SHOULD_INCLUDE_NO
805               || t == Archive::SHOULD_INCLUDE_YES)
806             this->armap_checked_[i] = true;
807
808           if (t != Archive::SHOULD_INCLUDE_YES)
809             continue;
810
811           // We want to include this object in the link.
812           last_seen_offset = this->armap_[i].file_offset;
813           this->seen_offsets_.insert(last_seen_offset);
814
815           if (!this->include_member(symtab, layout, input_objects,
816                                     last_seen_offset, mapfile, sym,
817                                     why.c_str()))
818             {
819               if (tmpbuf != NULL)
820                 free(tmpbuf);
821               return false;
822             }
823
824           added_new_object = true;
825         }
826     }
827   while (added_new_object);
828
829   if (tmpbuf != NULL)
830     free(tmpbuf);
831
832   input_objects->archive_stop(this);
833
834   return true;
835 }
836
837 // Return whether the archive includes a member which defines the
838 // symbol SYM.
839
840 bool
841 Archive::defines_symbol(Symbol* sym) const
842 {
843   const char* symname = sym->name();
844   size_t symname_len = strlen(symname);
845   size_t armap_size = this->armap_.size();
846   for (size_t i = 0; i < armap_size; ++i)
847     {
848       if (this->armap_checked_[i])
849         continue;
850       const char* archive_symname = (this->armap_names_.data()
851                                      + this->armap_[i].name_offset);
852       if (strncmp(archive_symname, symname, symname_len) != 0)
853         continue;
854       char c = archive_symname[symname_len];
855       if (c == '\0' && sym->version() == NULL)
856         return true;
857       if (c == '@')
858         {
859           const char* ver = archive_symname + symname_len + 1;
860           if (*ver == '@')
861             {
862               if (sym->version() == NULL)
863                 return true;
864               ++ver;
865             }
866           if (sym->version() != NULL && strcmp(sym->version(), ver) == 0)
867             return true;
868         }
869     }
870   return false;
871 }
872
873 // Include all the archive members in the link.  This is for --whole-archive.
874
875 bool
876 Archive::include_all_members(Symbol_table* symtab, Layout* layout,
877                              Input_objects* input_objects, Mapfile* mapfile)
878 {
879   // Don't include the same archive twice.  This can happen if
880   // --whole-archive is nested inside --start-group (PR gold/12163).
881   if (this->included_all_members_)
882     return true;
883
884   this->included_all_members_ = true;
885
886   input_objects->archive_start(this);
887
888   if (this->members_.size() > 0)
889     {
890       std::map<off_t, Archive_member>::const_iterator p;
891       for (p = this->members_.begin();
892            p != this->members_.end();
893            ++p)
894         {
895           if (!this->include_member(symtab, layout, input_objects, p->first,
896                                     mapfile, NULL, "--whole-archive"))
897             return false;
898           ++Archive::total_members;
899         }
900     }
901   else
902     {
903       for (Archive::const_iterator p = this->begin();
904            p != this->end();
905            ++p)
906         {
907           if (!this->include_member(symtab, layout, input_objects, p->off,
908                                     mapfile, NULL, "--whole-archive"))
909             return false;
910           ++Archive::total_members;
911         }
912     }
913
914   input_objects->archive_stop(this);
915
916   return true;
917 }
918
919 // Return the number of members in the archive.  This is only used for
920 // reports.
921
922 size_t
923 Archive::count_members()
924 {
925   size_t ret = 0;
926   for (Archive::const_iterator p = this->begin();
927        p != this->end();
928        ++p)
929     ++ret;
930   return ret;
931 }
932
933 // Include an archive member in the link.  OFF is the file offset of
934 // the member header.  WHY is the reason we are including this member.
935 // Return true if we added the member or if we had an error, return
936 // false if this was the first member we tried to add from this
937 // archive and it had an incompatible format.
938
939 bool
940 Archive::include_member(Symbol_table* symtab, Layout* layout,
941                         Input_objects* input_objects, off_t off,
942                         Mapfile* mapfile, Symbol* sym, const char* why)
943 {
944   ++Archive::total_members_loaded;
945
946   std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
947   if (p != this->members_.end())
948     {
949       Object* obj = p->second.obj_;
950
951       Read_symbols_data* sd = p->second.sd_;
952       if (mapfile != NULL)
953         mapfile->report_include_archive_member(obj->name(), sym, why);
954       if (input_objects->add_object(obj))
955         {
956           obj->layout(symtab, layout, sd);
957           obj->add_symbols(symtab, sd, layout);
958           this->included_member_ = true;
959         }
960       delete sd;
961       return true;
962     }
963
964   // If this is the first object we are including from this archive,
965   // and we searched for this archive, most likely because it was
966   // found via a -l option, then if the target is incompatible we want
967   // to move on to the next archive found in the search path.
968   bool unconfigured = false;
969   bool* punconfigured = NULL;
970   if (!this->included_member_ && this->searched_for())
971     punconfigured = &unconfigured;
972
973   Object* obj = this->get_elf_object_for_member(off, punconfigured);
974   if (obj == NULL)
975     {
976       // Return false to search for another archive, true if we found
977       // an error.
978       return unconfigured ? false : true;
979     }
980
981   if (mapfile != NULL)
982     mapfile->report_include_archive_member(obj->name(), sym, why);
983
984   Pluginobj* pluginobj = obj->pluginobj();
985   if (pluginobj != NULL)
986     {
987       pluginobj->add_symbols(symtab, NULL, layout);
988       this->included_member_ = true;
989       return true;
990     }
991
992   if (!input_objects->add_object(obj))
993     {
994       // If this is an external member of a thin archive, unlock the
995       // file.
996       if (obj->offset() == 0)
997         obj->unlock(this->task_);
998       delete obj;
999     }
1000   else
1001     {
1002       {
1003         if (layout->incremental_inputs() != NULL)
1004           layout->incremental_inputs()->report_object(obj, 0, this, NULL);
1005         Read_symbols_data sd;
1006         obj->read_symbols(&sd);
1007         obj->layout(symtab, layout, &sd);
1008         obj->add_symbols(symtab, &sd, layout);
1009       }
1010
1011       // If this is an external member of a thin archive, unlock the file
1012       // for the next task.
1013       if (obj->offset() == 0)
1014         obj->unlock(this->task_);
1015
1016       this->included_member_ = true;
1017     }
1018
1019   return true;
1020 }
1021
1022 // Iterate over all unused symbols, and call the visitor class V for each.
1023
1024 void
1025 Archive::do_for_all_unused_symbols(Symbol_visitor_base* v) const
1026 {
1027   for (std::vector<Armap_entry>::const_iterator p = this->armap_.begin();
1028        p != this->armap_.end();
1029        ++p)
1030     {
1031       if (this->seen_offsets_.find(p->file_offset)
1032           == this->seen_offsets_.end())
1033         v->visit(this->armap_names_.data() + p->name_offset);
1034     }
1035 }
1036
1037 // Print statistical information to stderr.  This is used for --stats.
1038
1039 void
1040 Archive::print_stats()
1041 {
1042   fprintf(stderr, _("%s: archive libraries: %u\n"),
1043           program_name, Archive::total_archives);
1044   fprintf(stderr, _("%s: total archive members: %u\n"),
1045           program_name, Archive::total_members);
1046   fprintf(stderr, _("%s: loaded archive members: %u\n"),
1047           program_name, Archive::total_members_loaded);
1048 }
1049
1050 // Add_archive_symbols methods.
1051
1052 Add_archive_symbols::~Add_archive_symbols()
1053 {
1054   if (this->this_blocker_ != NULL)
1055     delete this->this_blocker_;
1056   // next_blocker_ is deleted by the task associated with the next
1057   // input file.
1058 }
1059
1060 // Return whether we can add the archive symbols.  We are blocked by
1061 // this_blocker_.  We block next_blocker_.  We also lock the file.
1062
1063 Task_token*
1064 Add_archive_symbols::is_runnable()
1065 {
1066   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1067     return this->this_blocker_;
1068   return NULL;
1069 }
1070
1071 void
1072 Add_archive_symbols::locks(Task_locker* tl)
1073 {
1074   tl->add(this, this->next_blocker_);
1075   tl->add(this, this->archive_->token());
1076 }
1077
1078 void
1079 Add_archive_symbols::run(Workqueue* workqueue)
1080 {
1081   // For an incremental link, begin recording layout information.
1082   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
1083   if (incremental_inputs != NULL)
1084     {
1085       unsigned int arg_serial = this->input_argument_->file().arg_serial();
1086       Script_info* script_info = this->input_argument_->script_info();
1087       incremental_inputs->report_archive_begin(this->archive_, arg_serial,
1088                                                script_info);
1089     }
1090
1091   bool added = this->archive_->add_symbols(this->symtab_, this->layout_,
1092                                            this->input_objects_,
1093                                            this->mapfile_);
1094   this->archive_->unlock_nested_archives();
1095
1096   this->archive_->release();
1097   this->archive_->clear_uncached_views();
1098
1099   if (!added)
1100     {
1101       // This archive holds object files which are incompatible with
1102       // our output file.
1103       Read_symbols::incompatible_warning(this->input_argument_,
1104                                          this->archive_->input_file());
1105       Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
1106                             this->layout_, this->dirpath_, this->dirindex_,
1107                             this->mapfile_, this->input_argument_,
1108                             this->input_group_, this->next_blocker_);
1109       delete this->archive_;
1110       return;
1111     }
1112
1113   if (this->input_group_ != NULL)
1114     this->input_group_->add_archive(this->archive_);
1115   else
1116     {
1117       // For an incremental link, finish recording the layout information.
1118       if (incremental_inputs != NULL)
1119         incremental_inputs->report_archive_end(this->archive_);
1120
1121       if (!parameters->options().has_plugins()
1122           || this->archive_->input_file()->options().whole_archive())
1123         {
1124           // We no longer need to know about this archive.
1125           delete this->archive_;
1126         }
1127       else
1128         {
1129           // The plugin interface may want to rescan this archive.
1130           parameters->options().plugins()->save_archive(this->archive_);
1131         }
1132
1133       this->archive_ = NULL;
1134     }
1135 }
1136
1137 // Class Lib_group static variables.
1138 unsigned int Lib_group::total_lib_groups;
1139 unsigned int Lib_group::total_members;
1140 unsigned int Lib_group::total_members_loaded;
1141
1142 Lib_group::Lib_group(const Input_file_lib* lib, Task* task)
1143   : Library_base(task), members_()
1144 {
1145   this->members_.resize(lib->size());
1146 }
1147
1148 const std::string&
1149 Lib_group::do_filename() const
1150 {
1151   std::string *filename = new std::string("/group/");
1152   return *filename;
1153 }
1154
1155 // Select members from the lib group and add them to the link.  We walk
1156 // through the members, and check if each one up should be included.
1157 // If the object says it should be included, we do so.  We have to do
1158 // this in a loop, since including one member may create new undefined
1159 // symbols which may be satisfied by other members.
1160
1161 void
1162 Lib_group::add_symbols(Symbol_table* symtab, Layout* layout,
1163                        Input_objects* input_objects)
1164 {
1165   ++Lib_group::total_lib_groups;
1166
1167   Lib_group::total_members += this->members_.size();
1168
1169   bool added_new_object;
1170   do
1171     {
1172       added_new_object = false;
1173       unsigned int i = 0;
1174       while (i < this->members_.size())
1175         {
1176           const Archive_member& member = this->members_[i];
1177           Object* obj = member.obj_;
1178           std::string why;
1179
1180           // Skip files with no symbols. Plugin objects have
1181           // member.sd_ == NULL.
1182           if (obj != NULL
1183               && (member.sd_ == NULL || member.sd_->symbol_names != NULL))
1184             {
1185               Archive::Should_include t = obj->should_include_member(symtab,
1186                                                                      layout,
1187                                                                      member.sd_,
1188                                                                      &why);
1189
1190               if (t != Archive::SHOULD_INCLUDE_YES)
1191                 {
1192                   ++i;
1193                   continue;
1194                 }
1195
1196               this->include_member(symtab, layout, input_objects, member);
1197
1198               added_new_object = true;
1199             }
1200           else
1201             {
1202               if (member.sd_ != NULL)
1203                 {
1204                   // The file must be locked in order to destroy the views
1205                   // associated with it.
1206                   gold_assert(obj != NULL);
1207                   obj->lock(this->task_);
1208                   delete member.sd_;
1209                   obj->unlock(this->task_);
1210                 }
1211             }
1212
1213           this->members_[i] = this->members_.back();
1214           this->members_.pop_back();
1215         }
1216     }
1217   while (added_new_object);
1218 }
1219
1220 // Include a lib group member in the link.
1221
1222 void
1223 Lib_group::include_member(Symbol_table* symtab, Layout* layout,
1224                           Input_objects* input_objects,
1225                           const Archive_member& member)
1226 {
1227   ++Lib_group::total_members_loaded;
1228
1229   Object* obj = member.obj_;
1230   gold_assert(obj != NULL);
1231
1232   Pluginobj* pluginobj = obj->pluginobj();
1233   if (pluginobj != NULL)
1234     {
1235       pluginobj->add_symbols(symtab, NULL, layout);
1236       return;
1237     }
1238
1239   Read_symbols_data* sd = member.sd_;
1240   gold_assert(sd != NULL);
1241   obj->lock(this->task_);
1242   if (input_objects->add_object(obj))
1243     {
1244       if (layout->incremental_inputs() != NULL)
1245         layout->incremental_inputs()->report_object(obj, member.arg_serial_,
1246                                                     this, NULL);
1247       obj->layout(symtab, layout, sd);
1248       obj->add_symbols(symtab, sd, layout);
1249     }
1250   delete sd;
1251   // Unlock the file for the next task.
1252   obj->unlock(this->task_);
1253 }
1254
1255 // Iterate over all unused symbols, and call the visitor class V for each.
1256
1257 void
1258 Lib_group::do_for_all_unused_symbols(Symbol_visitor_base* v) const
1259 {
1260   // Files are removed from the members list when used, so all the
1261   // files remaining on the list are unused.
1262   for (std::vector<Archive_member>::const_iterator p = this->members_.begin();
1263        p != this->members_.end();
1264        ++p)
1265     {
1266       Object* obj = p->obj_;
1267       obj->for_all_global_symbols(p->sd_, v);
1268     }
1269 }
1270
1271 // Print statistical information to stderr.  This is used for --stats.
1272
1273 void
1274 Lib_group::print_stats()
1275 {
1276   fprintf(stderr, _("%s: lib groups: %u\n"),
1277           program_name, Lib_group::total_lib_groups);
1278   fprintf(stderr, _("%s: total lib groups members: %u\n"),
1279           program_name, Lib_group::total_members);
1280   fprintf(stderr, _("%s: loaded lib groups members: %u\n"),
1281           program_name, Lib_group::total_members_loaded);
1282 }
1283
1284 Task_token*
1285 Add_lib_group_symbols::is_runnable()
1286 {
1287   if (this->readsyms_blocker_ != NULL && this->readsyms_blocker_->is_blocked())
1288     return this->readsyms_blocker_;
1289   if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1290     return this->this_blocker_;
1291   return NULL;
1292 }
1293
1294 void
1295 Add_lib_group_symbols::locks(Task_locker* tl)
1296 {
1297   tl->add(this, this->next_blocker_);
1298 }
1299
1300 void
1301 Add_lib_group_symbols::run(Workqueue*)
1302 {
1303   // For an incremental link, begin recording layout information.
1304   Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
1305   if (incremental_inputs != NULL)
1306     incremental_inputs->report_archive_begin(this->lib_, 0, NULL);
1307
1308   this->lib_->add_symbols(this->symtab_, this->layout_, this->input_objects_);
1309
1310   if (incremental_inputs != NULL)
1311     incremental_inputs->report_archive_end(this->lib_);
1312 }
1313
1314 Add_lib_group_symbols::~Add_lib_group_symbols()
1315 {
1316   if (this->this_blocker_ != NULL)
1317     delete this->this_blocker_;
1318   // next_blocker_ is deleted by the task associated with the next
1319   // input file.
1320 }
1321
1322 } // End namespace gold.