Merge branch 'vendor/GCC50'
[dragonfly.git] / contrib / binutils-2.24 / gold / archive.cc
CommitLineData
f40e693d
JM
1// archive.cc -- archive support for gold
2
3// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2013
4// Free Software Foundation, Inc.
5// Written by Ian Lance Taylor <iant@google.com>.
6
7// This file is part of gold.
8
9// This program is free software; you can redistribute it and/or modify
10// it under the terms of the GNU General Public License as published by
11// the Free Software Foundation; either version 3 of the License, or
12// (at your option) any later version.
13
14// This program is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17// GNU General Public License for more details.
18
19// You should have received a copy of the GNU General Public License
20// along with this program; if not, write to the Free Software
21// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22// MA 02110-1301, USA.
23
24#include "gold.h"
25
26#include <cerrno>
27#include <cstring>
28#include <climits>
29#include <vector>
30#include "libiberty.h"
31#include "filenames.h"
32
33#include "elfcpp.h"
34#include "options.h"
35#include "mapfile.h"
36#include "fileread.h"
37#include "readsyms.h"
38#include "symtab.h"
39#include "object.h"
40#include "layout.h"
41#include "archive.h"
42#include "plugin.h"
43#include "incremental.h"
44
45namespace gold
46{
47
48// Library_base methods.
49
50// Determine whether a definition of SYM_NAME should cause an archive
51// library member to be included in the link. Returns SHOULD_INCLUDE_YES
52// if the symbol is referenced but not defined, SHOULD_INCLUDE_NO if the
53// symbol is already defined, and SHOULD_INCLUDE_UNKNOWN if the symbol is
54// neither referenced nor defined.
55
56Library_base::Should_include
57Library_base::should_include_member(Symbol_table* symtab, Layout* layout,
58 const char* sym_name, Symbol** symp,
59 std::string* why, char** tmpbufp,
60 size_t* tmpbuflen)
61{
62 // In an object file, and therefore in an archive map, an
63 // '@' in the name separates the symbol name from the
64 // version name. If there are two '@' characters, this is
65 // the default version.
66 char* tmpbuf = *tmpbufp;
67 const char* ver = strchr(sym_name, '@');
68 bool def = false;
69 if (ver != NULL)
70 {
71 size_t symlen = ver - sym_name;
72 if (symlen + 1 > *tmpbuflen)
73 {
74 tmpbuf = static_cast<char*>(xrealloc(tmpbuf, symlen + 1));
75 *tmpbufp = tmpbuf;
76 *tmpbuflen = symlen + 1;
77 }
78 memcpy(tmpbuf, sym_name, symlen);
79 tmpbuf[symlen] = '\0';
80 sym_name = tmpbuf;
81
82 ++ver;
83 if (*ver == '@')
84 {
85 ++ver;
86 def = true;
87 }
88 }
89
90 Symbol* sym = symtab->lookup(sym_name, ver);
91 if (def
92 && ver != NULL
93 && (sym == NULL
94 || !sym->is_undefined()
95 || sym->binding() == elfcpp::STB_WEAK))
96 sym = symtab->lookup(sym_name, NULL);
97
98 *symp = sym;
99
100 if (sym == NULL)
101 {
102 // Check whether the symbol was named in a -u option.
103 if (parameters->options().is_undefined(sym_name))
104 {
105 *why = "-u ";
106 *why += sym_name;
107 }
108 else if (parameters->options().is_export_dynamic_symbol(sym_name))
109 {
110 *why = "--export-dynamic-symbol ";
111 *why += sym_name;
112 }
113 else if (layout->script_options()->is_referenced(sym_name))
114 {
115 size_t alc = 100 + strlen(sym_name);
116 char* buf = new char[alc];
117 snprintf(buf, alc, _("script or expression reference to %s"),
118 sym_name);
119 *why = buf;
120 delete[] buf;
121 }
122 else if (strcmp(sym_name, parameters->entry()) == 0)
123 {
124 *why = "entry symbol ";
125 *why += sym_name;
126 }
127 else
128 return Library_base::SHOULD_INCLUDE_UNKNOWN;
129 }
130 else if (!sym->is_undefined())
131 return Library_base::SHOULD_INCLUDE_NO;
132 // PR 12001: Do not include an archive when the undefined
133 // symbol has actually been defined on the command line.
134 else if (layout->script_options()->is_pending_assignment(sym_name))
135 return Library_base::SHOULD_INCLUDE_NO;
136 else if (sym->binding() == elfcpp::STB_WEAK)
137 return Library_base::SHOULD_INCLUDE_UNKNOWN;
138
139 return Library_base::SHOULD_INCLUDE_YES;
140}
141
142// The header of an entry in the archive. This is all readable text,
143// padded with spaces where necessary. If the contents of an archive
144// are all text file, the entire archive is readable.
145
146struct Archive::Archive_header
147{
148 // The entry name.
149 char ar_name[16];
150 // The file modification time.
151 char ar_date[12];
152 // The user's UID in decimal.
153 char ar_uid[6];
154 // The user's GID in decimal.
155 char ar_gid[6];
156 // The file mode in octal.
157 char ar_mode[8];
158 // The file size in decimal.
159 char ar_size[10];
160 // The final magic code.
161 char ar_fmag[2];
162};
163
164// Class Archive static variables.
165unsigned int Archive::total_archives;
166unsigned int Archive::total_members;
167unsigned int Archive::total_members_loaded;
168
169// Archive methods.
170
171const char Archive::armag[sarmag] =
172{
173 '!', '<', 'a', 'r', 'c', 'h', '>', '\n'
174};
175
176const char Archive::armagt[sarmag] =
177{
178 '!', '<', 't', 'h', 'i', 'n', '>', '\n'
179};
180
181const char Archive::arfmag[2] = { '`', '\n' };
182
183Archive::Archive(const std::string& name, Input_file* input_file,
184 bool is_thin_archive, Dirsearch* dirpath, Task* task)
185 : Library_base(task), name_(name), input_file_(input_file), armap_(),
186 armap_names_(), extended_names_(), armap_checked_(), seen_offsets_(),
187 members_(), is_thin_archive_(is_thin_archive), included_member_(false),
188 nested_archives_(), dirpath_(dirpath), num_members_(0),
189 included_all_members_(false)
190{
191 this->no_export_ =
192 parameters->options().check_excluded_libs(input_file->found_name());
193}
194
195// Set up the archive: read the symbol map and the extended name
196// table.
197
198void
199Archive::setup()
200{
201 // We need to ignore empty archives.
202 if (this->input_file_->file().filesize() == sarmag)
203 return;
204
205 // The first member of the archive should be the symbol table.
206 std::string armap_name;
207 off_t header_size = this->read_header(sarmag, false, &armap_name, NULL);
208 if (header_size == -1)
209 return;
210
211 section_size_type armap_size = convert_to_section_size_type(header_size);
212 off_t off = sarmag;
213 if (armap_name.empty())
214 {
215 this->read_armap(sarmag + sizeof(Archive_header), armap_size);
216 off = sarmag + sizeof(Archive_header) + armap_size;
217 }
218 else if (!this->input_file_->options().whole_archive())
219 gold_error(_("%s: no archive symbol table (run ranlib)"),
220 this->name().c_str());
221
222 // See if there is an extended name table. We cache these views
223 // because it is likely that we will want to read the following
224 // header in the add_symbols routine.
225 if ((off & 1) != 0)
226 ++off;
227 std::string xname;
228 header_size = this->read_header(off, true, &xname, NULL);
229 if (header_size == -1)
230 return;
231
232 section_size_type extended_size = convert_to_section_size_type(header_size);
233 if (xname == "/")
234 {
235 const unsigned char* p = this->get_view(off + sizeof(Archive_header),
236 extended_size, false, true);
237 const char* px = reinterpret_cast<const char*>(p);
238 this->extended_names_.assign(px, extended_size);
239 }
240 bool preread_syms = (parameters->options().threads()
241 && parameters->options().preread_archive_symbols());
242#ifndef ENABLE_THREADS
243 preread_syms = false;
244#else
245 if (parameters->options().has_plugins())
246 preread_syms = false;
247#endif
248 if (preread_syms)
249 this->read_all_symbols();
250}
251
252// Unlock any nested archives.
253
254void
255Archive::unlock_nested_archives()
256{
257 for (Nested_archive_table::iterator p = this->nested_archives_.begin();
258 p != this->nested_archives_.end();
259 ++p)
260 {
261 p->second->unlock(this->task_);
262 }
263}
264
265// Read the archive symbol map.
266
267void
268Archive::read_armap(off_t start, section_size_type size)
269{
270 // To count the total number of archive members, we'll just count
271 // the number of times the file offset changes. Since most archives
272 // group the symbols in the armap by object, this ought to give us
273 // an accurate count.
274 off_t last_seen_offset = -1;
275
276 // Read in the entire armap.
277 const unsigned char* p = this->get_view(start, size, true, false);
278
279 // Numbers in the armap are always big-endian.
280 const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
281 unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
282 ++pword;
283
284 // Note that the addition is in units of sizeof(elfcpp::Elf_Word).
285 const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
286 section_size_type names_size =
287 reinterpret_cast<const char*>(p) + size - pnames;
288 this->armap_names_.assign(pnames, names_size);
289
290 this->armap_.resize(nsyms);
291
292 section_offset_type name_offset = 0;
293 for (unsigned int i = 0; i < nsyms; ++i)
294 {
295 this->armap_[i].name_offset = name_offset;
296 this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
297 name_offset += strlen(pnames + name_offset) + 1;
298 ++pword;
299 if (this->armap_[i].file_offset != last_seen_offset)
300 {
301 last_seen_offset = this->armap_[i].file_offset;
302 ++this->num_members_;
303 }
304 }
305
306 if (static_cast<section_size_type>(name_offset) > names_size)
307 gold_error(_("%s: bad archive symbol table names"),
308 this->name().c_str());
309
310 // This array keeps track of which symbols are for archive elements
311 // which we have already included in the link.
312 this->armap_checked_.resize(nsyms);
313}
314
315// Read the header of an archive member at OFF. Fail if something
316// goes wrong. Return the size of the member. Set *PNAME to the name
317// of the member.
318
319off_t
320Archive::read_header(off_t off, bool cache, std::string* pname,
321 off_t* nested_off)
322{
323 const unsigned char* p = this->get_view(off, sizeof(Archive_header), true,
324 cache);
325 const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
326 return this->interpret_header(hdr, off, pname, nested_off);
327}
328
329// Interpret the header of HDR, the header of the archive member at
330// file offset OFF. Return the size of the member, or -1 if something
331// has gone wrong. Set *PNAME to the name of the member.
332
333off_t
334Archive::interpret_header(const Archive_header* hdr, off_t off,
335 std::string* pname, off_t* nested_off) const
336{
337 if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
338 {
339 gold_error(_("%s: malformed archive header at %zu"),
340 this->name().c_str(), static_cast<size_t>(off));
341 return -1;
342 }
343
344 const int size_string_size = sizeof hdr->ar_size;
345 char size_string[size_string_size + 1];
346 memcpy(size_string, hdr->ar_size, size_string_size);
347 char* ps = size_string + size_string_size;
348 while (ps[-1] == ' ')
349 --ps;
350 *ps = '\0';
351
352 errno = 0;
353 char* end;
354 off_t member_size = strtol(size_string, &end, 10);
355 if (*end != '\0'
356 || member_size < 0
357 || (member_size == LONG_MAX && errno == ERANGE))
358 {
359 gold_error(_("%s: malformed archive header size at %zu"),
360 this->name().c_str(), static_cast<size_t>(off));
361 return -1;
362 }
363
364 if (hdr->ar_name[0] != '/')
365 {
366 const char* name_end = strchr(hdr->ar_name, '/');
367 if (name_end == NULL
368 || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
369 {
370 gold_error(_("%s: malformed archive header name at %zu"),
371 this->name().c_str(), static_cast<size_t>(off));
372 return -1;
373 }
374 pname->assign(hdr->ar_name, name_end - hdr->ar_name);
375 if (nested_off != NULL)
376 *nested_off = 0;
377 }
378 else if (hdr->ar_name[1] == ' ')
379 {
380 // This is the symbol table.
381 if (!pname->empty())
382 pname->clear();
383 }
384 else if (hdr->ar_name[1] == '/')
385 {
386 // This is the extended name table.
387 pname->assign(1, '/');
388 }
389 else
390 {
391 errno = 0;
392 long x = strtol(hdr->ar_name + 1, &end, 10);
393 long y = 0;
394 if (*end == ':')
395 y = strtol(end + 1, &end, 10);
396 if (*end != ' '
397 || x < 0
398 || (x == LONG_MAX && errno == ERANGE)
399 || static_cast<size_t>(x) >= this->extended_names_.size())
400 {
401 gold_error(_("%s: bad extended name index at %zu"),
402 this->name().c_str(), static_cast<size_t>(off));
403 return -1;
404 }
405
406 const char* name = this->extended_names_.data() + x;
407 const char* name_end = strchr(name, '\n');
408 if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
409 || name_end[-1] != '/')
410 {
411 gold_error(_("%s: bad extended name entry at header %zu"),
412 this->name().c_str(), static_cast<size_t>(off));
413 return -1;
414 }
415 pname->assign(name, name_end - 1 - name);
416 if (nested_off != NULL)
417 *nested_off = y;
418 }
419
420 return member_size;
421}
422
423// An archive member iterator.
424
425class Archive::const_iterator
426{
427 public:
428 // The header of an archive member. This is what this iterator
429 // points to.
430 struct Header
431 {
432 // The name of the member.
433 std::string name;
434 // The file offset of the member.
435 off_t off;
436 // The file offset of a nested archive member.
437 off_t nested_off;
438 // The size of the member.
439 off_t size;
440 };
441
442 const_iterator(Archive* archive, off_t off)
443 : archive_(archive), off_(off)
444 { this->read_next_header(); }
445
446 const Header&
447 operator*() const
448 { return this->header_; }
449
450 const Header*
451 operator->() const
452 { return &this->header_; }
453
454 const_iterator&
455 operator++()
456 {
457 if (this->off_ == this->archive_->file().filesize())
458 return *this;
459 this->off_ += sizeof(Archive_header);
460 if (!this->archive_->is_thin_archive())
461 this->off_ += this->header_.size;
462 if ((this->off_ & 1) != 0)
463 ++this->off_;
464 this->read_next_header();
465 return *this;
466 }
467
468 const_iterator
469 operator++(int)
470 {
471 const_iterator ret = *this;
472 ++*this;
473 return ret;
474 }
475
476 bool
477 operator==(const const_iterator p) const
478 { return this->off_ == p->off; }
479
480 bool
481 operator!=(const const_iterator p) const
482 { return this->off_ != p->off; }
483
484 private:
485 void
486 read_next_header();
487
488 // The underlying archive.
489 Archive* archive_;
490 // The current offset in the file.
491 off_t off_;
492 // The current archive header.
493 Header header_;
494};
495
496// Read the next archive header.
497
498void
499Archive::const_iterator::read_next_header()
500{
501 off_t filesize = this->archive_->file().filesize();
502 while (true)
503 {
504 if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header)))
505 {
506 if (filesize != this->off_)
507 {
508 gold_error(_("%s: short archive header at %zu"),
509 this->archive_->filename().c_str(),
510 static_cast<size_t>(this->off_));
511 this->off_ = filesize;
512 }
513 this->header_.off = filesize;
514 return;
515 }
516
517 unsigned char buf[sizeof(Archive_header)];
518 this->archive_->file().read(this->off_, sizeof(Archive_header), buf);
519
520 const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf);
521 off_t size = this->archive_->interpret_header(hdr, this->off_,
522 &this->header_.name,
523 &this->header_.nested_off);
524 if (size == -1)
525 {
526 this->header_.off = filesize;
527 return;
528 }
529
530 this->header_.size = size;
531 this->header_.off = this->off_;
532
533 // Skip special members.
534 if (!this->header_.name.empty() && this->header_.name != "/")
535 return;
536
537 this->off_ += sizeof(Archive_header) + this->header_.size;
538 if ((this->off_ & 1) != 0)
539 ++this->off_;
540 }
541}
542
543// Initial iterator.
544
545Archive::const_iterator
546Archive::begin()
547{
548 return Archive::const_iterator(this, sarmag);
549}
550
551// Final iterator.
552
553Archive::const_iterator
554Archive::end()
555{
556 return Archive::const_iterator(this, this->input_file_->file().filesize());
557}
558
559// Get the file and offset for an archive member, which may be an
560// external member of a thin archive. Set *INPUT_FILE to the
561// file containing the actual member, *MEMOFF to the offset
562// within that file (0 if not a nested archive), and *MEMBER_NAME
563// to the name of the archive member. Return TRUE on success.
564
565bool
566Archive::get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff,
567 off_t* memsize, std::string* member_name)
568{
569 off_t nested_off;
570
571 *memsize = this->read_header(off, false, member_name, &nested_off);
572 if (*memsize == -1)
573 return false;
574
575 *input_file = this->input_file_;
576 *memoff = off + static_cast<off_t>(sizeof(Archive_header));
577
578 if (!this->is_thin_archive_)
579 return true;
580
581 // Adjust a relative pathname so that it is relative
582 // to the directory containing the archive.
583 if (!IS_ABSOLUTE_PATH(member_name->c_str()))
584 {
585 const char* arch_path = this->filename().c_str();
586 const char* basename = lbasename(arch_path);
587 if (basename > arch_path)
588 member_name->replace(0, 0,
589 this->filename().substr(0, basename - arch_path));
590 }
591
592 if (nested_off > 0)
593 {
594 // This is a member of a nested archive. Open the containing
595 // archive if we don't already have it open, then do a recursive
596 // call to include the member from that archive.
597 Archive* arch;
598 Nested_archive_table::const_iterator p =
599 this->nested_archives_.find(*member_name);
600 if (p != this->nested_archives_.end())
601 arch = p->second;
602 else
603 {
604 Input_file_argument* input_file_arg =
605 new Input_file_argument(member_name->c_str(),
606 Input_file_argument::INPUT_FILE_TYPE_FILE,
607 "", false, parameters->options());
608 *input_file = new Input_file(input_file_arg);
609 int dummy = 0;
610 if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
611 return false;
612 arch = new Archive(*member_name, *input_file, false, this->dirpath_,
613 this->task_);
614 arch->setup();
615 std::pair<Nested_archive_table::iterator, bool> ins =
616 this->nested_archives_.insert(std::make_pair(*member_name, arch));
617 gold_assert(ins.second);
618 }
619 return arch->get_file_and_offset(nested_off, input_file, memoff,
620 memsize, member_name);
621 }
622
623 // This is an external member of a thin archive. Open the
624 // file as a regular relocatable object file.
625 Input_file_argument* input_file_arg =
626 new Input_file_argument(member_name->c_str(),
627 Input_file_argument::INPUT_FILE_TYPE_FILE,
628 "", false, this->input_file_->options());
629 *input_file = new Input_file(input_file_arg);
630 int dummy = 0;
631 if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
632 return false;
633
634 *memoff = 0;
635 *memsize = (*input_file)->file().filesize();
636 return true;
637}
638
639// Return an ELF object for the member at offset OFF. If
640// PUNCONFIGURED is not NULL, then if the ELF object has an
641// unsupported target type, set *PUNCONFIGURED to true and return
642// NULL.
643
644Object*
645Archive::get_elf_object_for_member(off_t off, bool* punconfigured)
646{
647 if (punconfigured != NULL)
648 *punconfigured = false;
649
650 Input_file* input_file;
651 off_t memoff;
652 off_t memsize;
653 std::string member_name;
654 if (!this->get_file_and_offset(off, &input_file, &memoff, &memsize,
655 &member_name))
656 return NULL;
657
658 const unsigned char* ehdr;
659 int read_size;
660 Object *obj = NULL;
661 bool is_elf_obj = false;
662
663 if (is_elf_object(input_file, memoff, &ehdr, &read_size))
664 {
665 obj = make_elf_object((std::string(this->input_file_->filename())
666 + "(" + member_name + ")"),
667 input_file, memoff, ehdr, read_size,
668 punconfigured);
669 is_elf_obj = true;
670 }
671
672 if (parameters->options().has_plugins())
673 {
674 Object* plugin_obj
675 = parameters->options().plugins()->claim_file(input_file,
676 memoff,
677 memsize,
678 obj);
679 if (plugin_obj != NULL)
680 {
681 // The input file was claimed by a plugin, and its symbols
682 // have been provided by the plugin.
683 // Delete its elf object.
684 if (obj != NULL)
685 delete obj;
686 return plugin_obj;
687 }
688 }
689
690 if (!is_elf_obj)
691 {
692 gold_error(_("%s: member at %zu is not an ELF object"),
693 this->name().c_str(), static_cast<size_t>(off));
694 return NULL;
695 }
696
697 if (obj == NULL)
698 return NULL;
699 obj->set_no_export(this->no_export());
700 return obj;
701}
702
703// Read the symbols from all the archive members in the link.
704
705void
706Archive::read_all_symbols()
707{
708 for (Archive::const_iterator p = this->begin();
709 p != this->end();
710 ++p)
711 this->read_symbols(p->off);
712}
713
714// Read the symbols from an archive member in the link. OFF is the file
715// offset of the member header.
716
717void
718Archive::read_symbols(off_t off)
719{
720 Object* obj = this->get_elf_object_for_member(off, NULL);
721 if (obj == NULL)
722 return;
723
724 Read_symbols_data* sd = new Read_symbols_data;
725 obj->read_symbols(sd);
726 Archive_member member(obj, sd);
727 this->members_[off] = member;
728}
729
730// Select members from the archive and add them to the link. We walk
731// through the elements in the archive map, and look each one up in
732// the symbol table. If it exists as a strong undefined symbol, we
733// pull in the corresponding element. We have to do this in a loop,
734// since pulling in one element may create new undefined symbols which
735// may be satisfied by other objects in the archive. Return true in
736// the normal case, false if the first member we tried to add from
737// this archive had an incompatible target.
738
739bool
740Archive::add_symbols(Symbol_table* symtab, Layout* layout,
741 Input_objects* input_objects, Mapfile* mapfile)
742{
743 ++Archive::total_archives;
744
745 if (this->input_file_->options().whole_archive())
746 return this->include_all_members(symtab, layout, input_objects,
747 mapfile);
748
749 Archive::total_members += this->num_members_;
750
751 input_objects->archive_start(this);
752
753 const size_t armap_size = this->armap_.size();
754
755 // This is a quick optimization, since we usually see many symbols
756 // in a row with the same offset. last_seen_offset holds the last
757 // offset we saw that was present in the seen_offsets_ set.
758 off_t last_seen_offset = -1;
759
760 // Track which symbols in the symbol table we've already found to be
761 // defined.
762
763 char* tmpbuf = NULL;
764 size_t tmpbuflen = 0;
765 bool added_new_object;
766 do
767 {
768 added_new_object = false;
769 for (size_t i = 0; i < armap_size; ++i)
770 {
771 if (this->armap_checked_[i])
772 continue;
773 if (this->armap_[i].file_offset == last_seen_offset)
774 {
775 this->armap_checked_[i] = true;
776 continue;
777 }
778 if (this->seen_offsets_.find(this->armap_[i].file_offset)
779 != this->seen_offsets_.end())
780 {
781 this->armap_checked_[i] = true;
782 last_seen_offset = this->armap_[i].file_offset;
783 continue;
784 }
785
786 const char* sym_name = (this->armap_names_.data()
787 + this->armap_[i].name_offset);
788
789 Symbol* sym;
790 std::string why;
791 Archive::Should_include t =
792 Archive::should_include_member(symtab, layout, sym_name, &sym,
793 &why, &tmpbuf, &tmpbuflen);
794
795 if (t == Archive::SHOULD_INCLUDE_NO
796 || t == Archive::SHOULD_INCLUDE_YES)
797 this->armap_checked_[i] = true;
798
799 if (t != Archive::SHOULD_INCLUDE_YES)
800 continue;
801
802 // We want to include this object in the link.
803 last_seen_offset = this->armap_[i].file_offset;
804 this->seen_offsets_.insert(last_seen_offset);
805
806 if (!this->include_member(symtab, layout, input_objects,
807 last_seen_offset, mapfile, sym,
808 why.c_str()))
809 {
810 if (tmpbuf != NULL)
811 free(tmpbuf);
812 return false;
813 }
814
815 added_new_object = true;
816 }
817 }
818 while (added_new_object);
819
820 if (tmpbuf != NULL)
821 free(tmpbuf);
822
823 input_objects->archive_stop(this);
824
825 return true;
826}
827
828// Return whether the archive includes a member which defines the
829// symbol SYM.
830
831bool
832Archive::defines_symbol(Symbol* sym) const
833{
834 const char* symname = sym->name();
835 size_t symname_len = strlen(symname);
836 size_t armap_size = this->armap_.size();
837 for (size_t i = 0; i < armap_size; ++i)
838 {
839 if (this->armap_checked_[i])
840 continue;
841 const char* archive_symname = (this->armap_names_.data()
842 + this->armap_[i].name_offset);
843 if (strncmp(archive_symname, symname, symname_len) != 0)
844 continue;
845 char c = archive_symname[symname_len];
846 if (c == '\0' && sym->version() == NULL)
847 return true;
848 if (c == '@')
849 {
850 const char* ver = archive_symname + symname_len + 1;
851 if (*ver == '@')
852 {
853 if (sym->version() == NULL)
854 return true;
855 ++ver;
856 }
857 if (sym->version() != NULL && strcmp(sym->version(), ver) == 0)
858 return true;
859 }
860 }
861 return false;
862}
863
864// Include all the archive members in the link. This is for --whole-archive.
865
866bool
867Archive::include_all_members(Symbol_table* symtab, Layout* layout,
868 Input_objects* input_objects, Mapfile* mapfile)
869{
870 // Don't include the same archive twice. This can happen if
871 // --whole-archive is nested inside --start-group (PR gold/12163).
872 if (this->included_all_members_)
873 return true;
874
875 this->included_all_members_ = true;
876
877 input_objects->archive_start(this);
878
879 if (this->members_.size() > 0)
880 {
881 std::map<off_t, Archive_member>::const_iterator p;
882 for (p = this->members_.begin();
883 p != this->members_.end();
884 ++p)
885 {
886 if (!this->include_member(symtab, layout, input_objects, p->first,
887 mapfile, NULL, "--whole-archive"))
888 return false;
889 ++Archive::total_members;
890 }
891 }
892 else
893 {
894 for (Archive::const_iterator p = this->begin();
895 p != this->end();
896 ++p)
897 {
898 if (!this->include_member(symtab, layout, input_objects, p->off,
899 mapfile, NULL, "--whole-archive"))
900 return false;
901 ++Archive::total_members;
902 }
903 }
904
905 input_objects->archive_stop(this);
906
907 return true;
908}
909
910// Return the number of members in the archive. This is only used for
911// reports.
912
913size_t
914Archive::count_members()
915{
916 size_t ret = 0;
917 for (Archive::const_iterator p = this->begin();
918 p != this->end();
919 ++p)
920 ++ret;
921 return ret;
922}
923
924// Include an archive member in the link. OFF is the file offset of
925// the member header. WHY is the reason we are including this member.
926// Return true if we added the member or if we had an error, return
927// false if this was the first member we tried to add from this
928// archive and it had an incompatible format.
929
930bool
931Archive::include_member(Symbol_table* symtab, Layout* layout,
932 Input_objects* input_objects, off_t off,
933 Mapfile* mapfile, Symbol* sym, const char* why)
934{
935 ++Archive::total_members_loaded;
936
937 std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
938 if (p != this->members_.end())
939 {
940 Object* obj = p->second.obj_;
941
942 Read_symbols_data* sd = p->second.sd_;
943 if (mapfile != NULL)
944 mapfile->report_include_archive_member(obj->name(), sym, why);
945 if (input_objects->add_object(obj))
946 {
947 obj->layout(symtab, layout, sd);
948 obj->add_symbols(symtab, sd, layout);
949 this->included_member_ = true;
950 }
951 delete sd;
952 return true;
953 }
954
955 // If this is the first object we are including from this archive,
956 // and we searched for this archive, most likely because it was
957 // found via a -l option, then if the target is incompatible we want
958 // to move on to the next archive found in the search path.
959 bool unconfigured = false;
960 bool* punconfigured = NULL;
961 if (!this->included_member_ && this->searched_for())
962 punconfigured = &unconfigured;
963
964 Object* obj = this->get_elf_object_for_member(off, punconfigured);
965 if (obj == NULL)
966 {
967 // Return false to search for another archive, true if we found
968 // an error.
969 return unconfigured ? false : true;
970 }
971
972 if (mapfile != NULL)
973 mapfile->report_include_archive_member(obj->name(), sym, why);
974
975 Pluginobj* pluginobj = obj->pluginobj();
976 if (pluginobj != NULL)
977 {
978 pluginobj->add_symbols(symtab, NULL, layout);
979 this->included_member_ = true;
980 return true;
981 }
982
983 if (!input_objects->add_object(obj))
984 {
985 // If this is an external member of a thin archive, unlock the
986 // file.
987 if (obj->offset() == 0)
988 obj->unlock(this->task_);
989 delete obj;
990 }
991 else
992 {
993 {
994 if (layout->incremental_inputs() != NULL)
995 layout->incremental_inputs()->report_object(obj, 0, this, NULL);
996 Read_symbols_data sd;
997 obj->read_symbols(&sd);
998 obj->layout(symtab, layout, &sd);
999 obj->add_symbols(symtab, &sd, layout);
1000 }
1001
1002 // If this is an external member of a thin archive, unlock the file
1003 // for the next task.
1004 if (obj->offset() == 0)
1005 obj->unlock(this->task_);
1006
1007 this->included_member_ = true;
1008 }
1009
1010 return true;
1011}
1012
1013// Iterate over all unused symbols, and call the visitor class V for each.
1014
1015void
1016Archive::do_for_all_unused_symbols(Symbol_visitor_base* v) const
1017{
1018 for (std::vector<Armap_entry>::const_iterator p = this->armap_.begin();
1019 p != this->armap_.end();
1020 ++p)
1021 {
1022 if (this->seen_offsets_.find(p->file_offset)
1023 == this->seen_offsets_.end())
1024 v->visit(this->armap_names_.data() + p->name_offset);
1025 }
1026}
1027
1028// Print statistical information to stderr. This is used for --stats.
1029
1030void
1031Archive::print_stats()
1032{
1033 fprintf(stderr, _("%s: archive libraries: %u\n"),
1034 program_name, Archive::total_archives);
1035 fprintf(stderr, _("%s: total archive members: %u\n"),
1036 program_name, Archive::total_members);
1037 fprintf(stderr, _("%s: loaded archive members: %u\n"),
1038 program_name, Archive::total_members_loaded);
1039}
1040
1041// Add_archive_symbols methods.
1042
1043Add_archive_symbols::~Add_archive_symbols()
1044{
1045 if (this->this_blocker_ != NULL)
1046 delete this->this_blocker_;
1047 // next_blocker_ is deleted by the task associated with the next
1048 // input file.
1049}
1050
1051// Return whether we can add the archive symbols. We are blocked by
1052// this_blocker_. We block next_blocker_. We also lock the file.
1053
1054Task_token*
1055Add_archive_symbols::is_runnable()
1056{
1057 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1058 return this->this_blocker_;
1059 return NULL;
1060}
1061
1062void
1063Add_archive_symbols::locks(Task_locker* tl)
1064{
1065 tl->add(this, this->next_blocker_);
1066 tl->add(this, this->archive_->token());
1067}
1068
1069void
1070Add_archive_symbols::run(Workqueue* workqueue)
1071{
1072 // For an incremental link, begin recording layout information.
1073 Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
1074 if (incremental_inputs != NULL)
1075 {
1076 unsigned int arg_serial = this->input_argument_->file().arg_serial();
1077 Script_info* script_info = this->input_argument_->script_info();
1078 incremental_inputs->report_archive_begin(this->archive_, arg_serial,
1079 script_info);
1080 }
1081
1082 bool added = this->archive_->add_symbols(this->symtab_, this->layout_,
1083 this->input_objects_,
1084 this->mapfile_);
1085 this->archive_->unlock_nested_archives();
1086
1087 this->archive_->release();
1088 this->archive_->clear_uncached_views();
1089
1090 if (!added)
1091 {
1092 // This archive holds object files which are incompatible with
1093 // our output file.
1094 Read_symbols::incompatible_warning(this->input_argument_,
1095 this->archive_->input_file());
1096 Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
1097 this->layout_, this->dirpath_, this->dirindex_,
1098 this->mapfile_, this->input_argument_,
1099 this->input_group_, this->next_blocker_);
1100 delete this->archive_;
1101 return;
1102 }
1103
1104 if (this->input_group_ != NULL)
1105 this->input_group_->add_archive(this->archive_);
1106 else
1107 {
1108 // For an incremental link, finish recording the layout information.
1109 if (incremental_inputs != NULL)
1110 incremental_inputs->report_archive_end(this->archive_);
1111
1112 if (!parameters->options().has_plugins()
1113 || this->archive_->input_file()->options().whole_archive())
1114 {
1115 // We no longer need to know about this archive.
1116 delete this->archive_;
1117 }
1118 else
1119 {
1120 // The plugin interface may want to rescan this archive.
1121 parameters->options().plugins()->save_archive(this->archive_);
1122 }
1123
1124 this->archive_ = NULL;
1125 }
1126}
1127
1128// Class Lib_group static variables.
1129unsigned int Lib_group::total_lib_groups;
1130unsigned int Lib_group::total_members;
1131unsigned int Lib_group::total_members_loaded;
1132
1133Lib_group::Lib_group(const Input_file_lib* lib, Task* task)
1134 : Library_base(task), members_()
1135{
1136 this->members_.resize(lib->size());
1137}
1138
1139const std::string&
1140Lib_group::do_filename() const
1141{
1142 std::string *filename = new std::string("/group/");
1143 return *filename;
1144}
1145
1146// Select members from the lib group and add them to the link. We walk
1147// through the members, and check if each one up should be included.
1148// If the object says it should be included, we do so. We have to do
1149// this in a loop, since including one member may create new undefined
1150// symbols which may be satisfied by other members.
1151
1152void
1153Lib_group::add_symbols(Symbol_table* symtab, Layout* layout,
1154 Input_objects* input_objects)
1155{
1156 ++Lib_group::total_lib_groups;
1157
1158 Lib_group::total_members += this->members_.size();
1159
1160 bool added_new_object;
1161 do
1162 {
1163 added_new_object = false;
1164 unsigned int i = 0;
1165 while (i < this->members_.size())
1166 {
1167 const Archive_member& member = this->members_[i];
1168 Object* obj = member.obj_;
1169 std::string why;
1170
1171 // Skip files with no symbols. Plugin objects have
1172 // member.sd_ == NULL.
1173 if (obj != NULL
1174 && (member.sd_ == NULL || member.sd_->symbol_names != NULL))
1175 {
1176 Archive::Should_include t = obj->should_include_member(symtab,
1177 layout,
1178 member.sd_,
1179 &why);
1180
1181 if (t != Archive::SHOULD_INCLUDE_YES)
1182 {
1183 ++i;
1184 continue;
1185 }
1186
1187 this->include_member(symtab, layout, input_objects, member);
1188
1189 added_new_object = true;
1190 }
1191 else
1192 {
1193 if (member.sd_ != NULL)
1194 {
1195 // The file must be locked in order to destroy the views
1196 // associated with it.
1197 gold_assert(obj != NULL);
1198 obj->lock(this->task_);
1199 delete member.sd_;
1200 obj->unlock(this->task_);
1201 }
1202 }
1203
1204 this->members_[i] = this->members_.back();
1205 this->members_.pop_back();
1206 }
1207 }
1208 while (added_new_object);
1209}
1210
1211// Include a lib group member in the link.
1212
1213void
1214Lib_group::include_member(Symbol_table* symtab, Layout* layout,
1215 Input_objects* input_objects,
1216 const Archive_member& member)
1217{
1218 ++Lib_group::total_members_loaded;
1219
1220 Object* obj = member.obj_;
1221 gold_assert(obj != NULL);
1222
1223 Pluginobj* pluginobj = obj->pluginobj();
1224 if (pluginobj != NULL)
1225 {
1226 pluginobj->add_symbols(symtab, NULL, layout);
1227 return;
1228 }
1229
1230 Read_symbols_data* sd = member.sd_;
1231 gold_assert(sd != NULL);
1232 obj->lock(this->task_);
1233 if (input_objects->add_object(obj))
1234 {
1235 if (layout->incremental_inputs() != NULL)
1236 layout->incremental_inputs()->report_object(obj, member.arg_serial_,
1237 this, NULL);
1238 obj->layout(symtab, layout, sd);
1239 obj->add_symbols(symtab, sd, layout);
1240 }
1241 delete sd;
1242 // Unlock the file for the next task.
1243 obj->unlock(this->task_);
1244}
1245
1246// Iterate over all unused symbols, and call the visitor class V for each.
1247
1248void
1249Lib_group::do_for_all_unused_symbols(Symbol_visitor_base* v) const
1250{
1251 // Files are removed from the members list when used, so all the
1252 // files remaining on the list are unused.
1253 for (std::vector<Archive_member>::const_iterator p = this->members_.begin();
1254 p != this->members_.end();
1255 ++p)
1256 {
1257 Object* obj = p->obj_;
1258 obj->for_all_global_symbols(p->sd_, v);
1259 }
1260}
1261
1262// Print statistical information to stderr. This is used for --stats.
1263
1264void
1265Lib_group::print_stats()
1266{
1267 fprintf(stderr, _("%s: lib groups: %u\n"),
1268 program_name, Lib_group::total_lib_groups);
1269 fprintf(stderr, _("%s: total lib groups members: %u\n"),
1270 program_name, Lib_group::total_members);
1271 fprintf(stderr, _("%s: loaded lib groups members: %u\n"),
1272 program_name, Lib_group::total_members_loaded);
1273}
1274
1275Task_token*
1276Add_lib_group_symbols::is_runnable()
1277{
1278 if (this->readsyms_blocker_ != NULL && this->readsyms_blocker_->is_blocked())
1279 return this->readsyms_blocker_;
1280 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
1281 return this->this_blocker_;
1282 return NULL;
1283}
1284
1285void
1286Add_lib_group_symbols::locks(Task_locker* tl)
1287{
1288 tl->add(this, this->next_blocker_);
1289}
1290
1291void
1292Add_lib_group_symbols::run(Workqueue*)
1293{
1294 // For an incremental link, begin recording layout information.
1295 Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
1296 if (incremental_inputs != NULL)
1297 incremental_inputs->report_archive_begin(this->lib_, 0, NULL);
1298
1299 this->lib_->add_symbols(this->symtab_, this->layout_, this->input_objects_);
1300
1301 if (incremental_inputs != NULL)
1302 incremental_inputs->report_archive_end(this->lib_);
1303}
1304
1305Add_lib_group_symbols::~Add_lib_group_symbols()
1306{
1307 if (this->this_blocker_ != NULL)
1308 delete this->this_blocker_;
1309 // next_blocker_ is deleted by the task associated with the next
1310 // input file.
1311}
1312
1313} // End namespace gold.