[deliverable/binutils-gdb.git] / gold / archive.cc

// archive.cc -- archive support for gold

#include "gold.h"

#include <cerrno>
#include <cstring>
#include <climits>
#include <vector>

#include "elfcpp.h"
#include "options.h"
#include "fileread.h"
#include "readsyms.h"
#include "symtab.h"
#include "object.h"
#include "archive.h"

namespace gold
{

// The header of an entry in the archive.  This is all readable text,
// padded with spaces where necesary.  If the contents of an archive
// are all text file, the entire archive is readable.

struct Archive::Archive_header
{
  // The entry name.
  char ar_name[16];
  // The file modification time.
  char ar_date[12];
  // The user's UID in decimal.
  char ar_uid[6];
  // The user's GID in decimal.
  char ar_gid[6];
  // The file mode in octal.
  char ar_mode[8];
  // The file size in decimal.
  char ar_size[10];
  // The final magic code.
  char ar_fmag[2];
};

// Archive methods.

const char Archive::armag[sarmag] =
{
  '!', '<', 'a', 'r', 'c', 'h', '>', '\n'
};

const char Archive::arfmag[2] = { '`', '\n' };

// Set up the archive: read the symbol map and the extended name
// table.

void
Archive::setup()
{
  // The first member of the archive should be the symbol table.
  std::string armap_name;
  off_t armap_size = this->read_header(sarmag, &armap_name);
  off_t off;
  if (armap_name.empty())
    {
      this->read_armap(sarmag + sizeof(Archive_header), armap_size);
      off = sarmag + sizeof(Archive_header) + armap_size;
    }
  else if (!this->input_file_->options().include_whole_archive())
    {
      fprintf(stderr, _("%s: %s: no archive symbol table (run ranlib)\n"),
	      program_name, this->name().c_str());
      gold_exit(false);
    }
  else
    off = sarmag;

  // See if there is an extended name table.
  if ((off & 1) != 0)
    ++off;
  std::string xname;
  off_t extended_size = this->read_header(off, &xname);
  if (xname == "/")
    {
      const unsigned char* p = this->get_view(off + sizeof(Archive_header),
                                              extended_size);
      const char* px = reinterpret_cast<const char*>(p);
      this->extended_names_.assign(px, extended_size);
    }

  // Opening the file locked it.  Unlock it now.
  this->input_file_->file().unlock();
}

// Read the archive symbol map.

void
Archive::read_armap(off_t start, off_t size)
{
  // Read in the entire armap.
  const unsigned char* p = this->get_view(start, size);

  // Numbers in the armap are always big-endian.
  const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
  unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
  ++pword;

  // Note that the addition is in units of sizeof(elfcpp::Elf_Word).
  const char* pnames = reinterpret_cast<const char*>(pword + nsyms);

  this->armap_.resize(nsyms);

  for (unsigned int i = 0; i < nsyms; ++i)
    {
      this->armap_[i].name = pnames;
      this->armap_[i].offset = elfcpp::Swap<32, true>::readval(pword);
      pnames += strlen(pnames) + 1;
      ++pword;
    }

  if (reinterpret_cast<const unsigned char*>(pnames) - p > size)
    {
      fprintf(stderr, _("%s: %s: bad archive symbol table names\n"),
	      program_name, this->name().c_str());
      gold_exit(false);
    }

  // This array keeps track of which symbols are for archive elements
  // which we have already included in the link.
  this->armap_checked_.resize(nsyms);
}

// Read the header of an archive member at OFF.  Fail if something
// goes wrong.  Return the size of the member.  Set *PNAME to the name
// of the member.

off_t
Archive::read_header(off_t off, std::string* pname)
{
  const unsigned char* p = this->get_view(off, sizeof(Archive_header));
  const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
  return this->interpret_header(hdr, off,  pname);
}

// Interpret the header of HDR, the header of the archive member at
// file offset OFF.  Fail if something goes wrong.  Return the size of
// the member.  Set *PNAME to the name of the member.

off_t
Archive::interpret_header(const Archive_header* hdr, off_t off,
                          std::string* pname)
{
  if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
    {
      fprintf(stderr, _("%s; %s: malformed archive header at %ld\n"),
	      program_name, this->name().c_str(),
	      static_cast<long>(off));
      gold_exit(false);
    }

  const int size_string_size = sizeof hdr->ar_size;
  char size_string[size_string_size + 1];
  memcpy(size_string, hdr->ar_size, size_string_size);
  char* ps = size_string + size_string_size;
  while (ps[-1] == ' ')
    --ps;
  *ps = '\0';

  errno = 0;
  char* end;
  off_t member_size = strtol(size_string, &end, 10);
  if (*end != '\0'
      || member_size < 0
      || (member_size == LONG_MAX && errno == ERANGE))
    {
      fprintf(stderr, _("%s: %s: malformed archive header size at %ld\n"),
	      program_name, this->name().c_str(),
	      static_cast<long>(off));
      gold_exit(false);
    }

  if (hdr->ar_name[0] != '/')
    {
      const char* name_end = strchr(hdr->ar_name, '/');
      if (name_end == NULL
	  || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
	{
	  fprintf(stderr, _("%s: %s: malformed archive header name at %ld\n"),
		  program_name, this->name().c_str(),
		  static_cast<long>(off));
	  gold_exit(false);
	}
      pname->assign(hdr->ar_name, name_end - hdr->ar_name);
    }
  else if (hdr->ar_name[1] == ' ')
    {
      // This is the symbol table.
      pname->clear();
    }
  else if (hdr->ar_name[1] == '/')
    {
      // This is the extended name table.
      pname->assign(1, '/');
    }
  else
    {
      errno = 0;
      long x = strtol(hdr->ar_name + 1, &end, 10);
      if (*end != ' '
	  || x < 0
	  || (x == LONG_MAX && errno == ERANGE)
	  || static_cast<size_t>(x) >= this->extended_names_.size())
	{
	  fprintf(stderr, _("%s: %s: bad extended name index at %ld\n"),
		  program_name, this->name().c_str(),
		  static_cast<long>(off));
	  gold_exit(false);
	}

      const char* name = this->extended_names_.data() + x;
      const char* name_end = strchr(name, '/');
      if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
	  || name_end[1] != '\n')
	{
	  fprintf(stderr, _("%s: %s: bad extended name entry at header %ld\n"),
		  program_name, this->name().c_str(),
		  static_cast<long>(off));
	  gold_exit(false);
	}
      pname->assign(name, name_end - name);
    }

  return member_size;
}

// Select members from the archive and add them to the link.  We walk
// through the elements in the archive map, and look each one up in
// the symbol table.  If it exists as a strong undefined symbol, we
// pull in the corresponding element.  We have to do this in a loop,
// since pulling in one element may create new undefined symbols which
// may be satisfied by other objects in the archive.

void
Archive::add_symbols(Symbol_table* symtab, Layout* layout,
		     Input_objects* input_objects)
{
  if (this->input_file_->options().include_whole_archive())
    return this->include_all_members(symtab, layout, input_objects);

  const size_t armap_size = this->armap_.size();

  // This is a quick optimization, since we usually see many symbols
  // in a row with the same offset.  last_seen_offset holds the last
  // offset we saw that was present in the seen_offsets_ set.
  off_t last_seen_offset = -1;

  // Track which symbols in the symbol table we've already found to be
  // defined.

  bool added_new_object;
  do
    {
      added_new_object = false;
      for (size_t i = 0; i < armap_size; ++i)
	{
          if (this->armap_checked_[i])
            continue;
	  if (this->armap_[i].offset == last_seen_offset)
            {
              this->armap_checked_[i] = true;
              continue;
            }
	  if (this->seen_offsets_.find(this->armap_[i].offset)
              != this->seen_offsets_.end())
	    {
              this->armap_checked_[i] = true;
	      last_seen_offset = this->armap_[i].offset;
	      continue;
	    }

	  Symbol* sym = symtab->lookup(this->armap_[i].name);
	  if (sym == NULL)
	    continue;
	  else if (!sym->is_undefined())
	    {
              this->armap_checked_[i] = true;
	      continue;
	    }
	  else if (sym->binding() == elfcpp::STB_WEAK)
	    continue;

	  // We want to include this object in the link.
	  last_seen_offset = this->armap_[i].offset;
	  this->seen_offsets_.insert(last_seen_offset);
          this->armap_checked_[i] = true;
	  this->include_member(symtab, layout, input_objects,
			       last_seen_offset);
	  added_new_object = true;
	}
    }
  while (added_new_object);
}

// Include all the archive members in the link.  This is for --whole-archive.

void
Archive::include_all_members(Symbol_table* symtab, Layout* layout,
                             Input_objects* input_objects)
{
  off_t off = sarmag;
  while (true)
    {
      off_t bytes;
      const unsigned char* p = this->get_view(off, sizeof(Archive_header),
                                              &bytes);
      if (bytes < sizeof(Archive_header))
        {
          if (bytes != 0)
            {
              fprintf(stderr, _("%s: %s: short archive header at %ld\n"),
                      program_name, this->name().c_str(),
                      static_cast<long>(off));
              gold_exit(false);
            }

          break;
        }

      const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
      std::string name;
      off_t size = this->interpret_header(hdr, off, &name);
      if (name.empty())
        {
          // Symbol table.
        }
      else if (name == "/")
        {
          // Extended name table.
        }
      else
        this->include_member(symtab, layout, input_objects, off);

      off += sizeof(Archive_header) + size;
      if ((off & 1) != 0)
        ++off;
    }
}

// Include an archive member in the link.  OFF is the file offset of
// the member header.

void
Archive::include_member(Symbol_table* symtab, Layout* layout,
			Input_objects* input_objects, off_t off)
{
  std::string n;
  this->read_header(off, &n);

  size_t memoff = off + sizeof(Archive_header);

  // Read enough of the file to pick up the entire ELF header.
  int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
  off_t bytes;
  const unsigned char* p = this->input_file_->file().get_view(memoff,
							      ehdr_size,
							      &bytes);
  if (bytes < 4)
    {
      fprintf(stderr, _("%s: %s: member at %ld is not an ELF object"),
	      program_name, this->name().c_str(),
	      static_cast<long>(off));
      gold_exit(false);
    }

  static unsigned char elfmagic[4] =
    {
      elfcpp::ELFMAG0, elfcpp::ELFMAG1,
      elfcpp::ELFMAG2, elfcpp::ELFMAG3
    };
  if (memcmp(p, elfmagic, 4) != 0)
    {
      fprintf(stderr, _("%s: %s: member at %ld is not an ELF object"),
	      program_name, this->name().c_str(),
	      static_cast<long>(off));
      gold_exit(false);
    }

  Object* obj = make_elf_object((std::string(this->input_file_->filename())
				 + "(" + n + ")"),
				this->input_file_, memoff, p, bytes);

  input_objects->add_object(obj);

  Read_symbols_data sd;
  obj->read_symbols(&sd);
  obj->layout(symtab, layout, &sd);
  obj->add_symbols(symtab, &sd);
}

// Add_archive_symbols methods.

Add_archive_symbols::~Add_archive_symbols()
{
  if (this->this_blocker_ != NULL)
    delete this->this_blocker_;
  // next_blocker_ is deleted by the task associated with the next
  // input file.
}

// Return whether we can add the archive symbols.  We are blocked by
// this_blocker_.  We block next_blocker_.  We also lock the file.

Task::Is_runnable_type
Add_archive_symbols::is_runnable(Workqueue*)
{
  if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
    return IS_BLOCKED;
  return IS_RUNNABLE;
}

class Add_archive_symbols::Add_archive_symbols_locker : public Task_locker
{
 public:
  Add_archive_symbols_locker(Task_token& token, Workqueue* workqueue,
			     File_read& file)
    : blocker_(token, workqueue), filelock_(file)
  { }

 private:
  Task_locker_block blocker_;
  Task_locker_obj<File_read> filelock_;
};

Task_locker*
Add_archive_symbols::locks(Workqueue* workqueue)
{
  return new Add_archive_symbols_locker(*this->next_blocker_,
					workqueue,
					this->archive_->file());
}

void
Add_archive_symbols::run(Workqueue*)
{
  this->archive_->add_symbols(this->symtab_, this->layout_,
			      this->input_objects_);

  if (this->input_group_ != NULL)
    this->input_group_->add_archive(this->archive_);
  else
    {
      // We no longer need to know about this archive.
      delete this->archive_;
    }
}

} // End namespace gold.
Commit	Line	Data
61ba1cf9 ILT	1	// archive.cc -- archive support for gold
	2
	3	#include "gold.h"
	4
	5	#include <cerrno>
	6	#include <cstring>
	7	#include <climits>
	8	#include <vector>
	9
	10	#include "elfcpp.h"
7e1edb90	11	#include "options.h"
61ba1cf9	12	#include "fileread.h"
ead1e424	13	#include "readsyms.h"
61ba1cf9 ILT	14	#include "symtab.h"
	15	#include "object.h"
	16	#include "archive.h"
	17
	18	namespace gold
	19	{
	20
	21	// The header of an entry in the archive. This is all readable text,
	22	// padded with spaces where necesary. If the contents of an archive
	23	// are all text file, the entire archive is readable.
	24
	25	struct Archive::Archive_header
	26	{
	27	// The entry name.
	28	char ar_name[16];
	29	// The file modification time.
	30	char ar_date[12];
	31	// The user's UID in decimal.
	32	char ar_uid[6];
	33	// The user's GID in decimal.
	34	char ar_gid[6];
	35	// The file mode in octal.
	36	char ar_mode[8];
	37	// The file size in decimal.
	38	char ar_size[10];
	39	// The final magic code.
	40	char ar_fmag[2];
	41	};
	42
	43	// Archive methods.
	44
	45	const char Archive::armag[sarmag] =
	46	{
	47	'!', '<', 'a', 'r', 'c', 'h', '>', '\n'
	48	};
	49
	50	const char Archive::arfmag[2] = { '`', '\n' };
	51
61ba1cf9 ILT	52	// Set up the archive: read the symbol map and the extended name
	53	// table.
	54
	55	void
	56	Archive::setup()
	57	{
	58	// The first member of the archive should be the symbol table.
	59	std::string armap_name;
	60	off_t armap_size = this->read_header(sarmag, &armap_name);
4973341a ILT	61	off_t off;
	62	if (armap_name.empty())
	63	{
	64	this->read_armap(sarmag + sizeof(Archive_header), armap_size);
	65	off = sarmag + sizeof(Archive_header) + armap_size;
	66	}
	67	else if (!this->input_file_->options().include_whole_archive())
61ba1cf9 ILT	68	{
	69	fprintf(stderr, _("%s: %s: no archive symbol table (run ranlib)\n"),
	70	program_name, this->name().c_str());
	71	gold_exit(false);
	72	}
4973341a ILT	73	else
	74	off = sarmag;
	75
	76	// See if there is an extended name table.
	77	if ((off & 1) != 0)
	78	++off;
	79	std::string xname;
	80	off_t extended_size = this->read_header(off, &xname);
	81	if (xname == "/")
	82	{
	83	const unsigned char* p = this->get_view(off + sizeof(Archive_header),
	84	extended_size);
	85	const char* px = reinterpret_cast<const char*>(p);
	86	this->extended_names_.assign(px, extended_size);
	87	}
	88
	89	// Opening the file locked it. Unlock it now.
	90	this->input_file_->file().unlock();
	91	}
61ba1cf9	92
4973341a ILT	93	// Read the archive symbol map.
	94
	95	void
	96	Archive::read_armap(off_t start, off_t size)
	97	{
61ba1cf9	98	// Read in the entire armap.
4973341a	99	const unsigned char* p = this->get_view(start, size);
61ba1cf9 ILT	100
	101	// Numbers in the armap are always big-endian.
	102	const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
f6ce93d6	103	unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
61ba1cf9 ILT	104	++pword;
	105
	106	// Note that the addition is in units of sizeof(elfcpp::Elf_Word).
	107	const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
	108
	109	this->armap_.resize(nsyms);
	110
	111	for (unsigned int i = 0; i < nsyms; ++i)
	112	{
	113	this->armap_[i].name = pnames;
f6ce93d6	114	this->armap_[i].offset = elfcpp::Swap<32, true>::readval(pword);
61ba1cf9 ILT	115	pnames += strlen(pnames) + 1;
	116	++pword;
	117	}
	118
4973341a	119	if (reinterpret_cast<const unsigned char*>(pnames) - p > size)
61ba1cf9 ILT	120	{
	121	fprintf(stderr, _("%s: %s: bad archive symbol table names\n"),
	122	program_name, this->name().c_str());
	123	gold_exit(false);
	124	}
a93d6d07 ILT	125
	126	// This array keeps track of which symbols are for archive elements
	127	// which we have already included in the link.
	128	this->armap_checked_.resize(nsyms);
61ba1cf9 ILT	129	}
	130
	131	// Read the header of an archive member at OFF. Fail if something
	132	// goes wrong. Return the size of the member. Set *PNAME to the name
	133	// of the member.
	134
	135	off_t
	136	Archive::read_header(off_t off, std::string* pname)
	137	{
	138	const unsigned char* p = this->get_view(off, sizeof(Archive_header));
	139	const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
4973341a ILT	140	return this->interpret_header(hdr, off, pname);
4973341a ILT	141	}
61ba1cf9	142
4973341a ILT	143	// Interpret the header of HDR, the header of the archive member at
	144	// file offset OFF. Fail if something goes wrong. Return the size of
	145	// the member. Set *PNAME to the name of the member.
	146
	147	off_t
	148	Archive::interpret_header(const Archive_header* hdr, off_t off,
	149	std::string* pname)
	150	{
61ba1cf9 ILT	151	if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
	152	{
	153	fprintf(stderr, _("%s; %s: malformed archive header at %ld\n"),
	154	program_name, this->name().c_str(),
	155	static_cast<long>(off));
	156	gold_exit(false);
	157	}
	158
	159	const int size_string_size = sizeof hdr->ar_size;
	160	char size_string[size_string_size + 1];
	161	memcpy(size_string, hdr->ar_size, size_string_size);
	162	char* ps = size_string + size_string_size;
	163	while (ps[-1] == ' ')
	164	--ps;
	165	*ps = '\0';
	166
	167	errno = 0;
	168	char* end;
	169	off_t member_size = strtol(size_string, &end, 10);
	170	if (*end != '\0'
	171	\|\| member_size < 0
	172	\|\| (member_size == LONG_MAX && errno == ERANGE))
	173	{
	174	fprintf(stderr, _("%s: %s: malformed archive header size at %ld\n"),
	175	program_name, this->name().c_str(),
	176	static_cast<long>(off));
	177	gold_exit(false);
	178	}
	179
	180	if (hdr->ar_name[0] != '/')
	181	{
	182	const char* name_end = strchr(hdr->ar_name, '/');
	183	if (name_end == NULL
	184	\|\| name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
	185	{
	186	fprintf(stderr, _("%s: %s: malformed archive header name at %ld\n"),
	187	program_name, this->name().c_str(),
	188	static_cast<long>(off));
	189	gold_exit(false);
	190	}
	191	pname->assign(hdr->ar_name, name_end - hdr->ar_name);
	192	}
	193	else if (hdr->ar_name[1] == ' ')
	194	{
	195	// This is the symbol table.
	196	pname->clear();
	197	}
	198	else if (hdr->ar_name[1] == '/')
	199	{
	200	// This is the extended name table.
	201	pname->assign(1, '/');
	202	}
	203	else
	204	{
	205	errno = 0;
	206	long x = strtol(hdr->ar_name + 1, &end, 10);
	207	if (*end != ' '
	208	\|\| x < 0
	209	\|\| (x == LONG_MAX && errno == ERANGE)
	210	\|\| static_cast<size_t>(x) >= this->extended_names_.size())
	211	{
	212	fprintf(stderr, _("%s: %s: bad extended name index at %ld\n"),
	213	program_name, this->name().c_str(),
	214	static_cast<long>(off));
215	gold_exit(false);
216	}
217
218	const char* name = this->extended_names_.data() + x;
219	const char* name_end = strchr(name, '/');
220	if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
221	\|\| name_end[1] != '\n')
222	{
223	fprintf(stderr, _("%s: %s: bad extended name entry at header %ld\n"),
224	program_name, this->name().c_str(),
225	static_cast<long>(off));
226	gold_exit(false);
227	}
228	pname->assign(name, name_end - name);
229	}
230
231	return member_size;
232	}
233
234	// Select members from the archive and add them to the link. We walk
235	// through the elements in the archive map, and look each one up in
236	// the symbol table. If it exists as a strong undefined symbol, we
237	// pull in the corresponding element. We have to do this in a loop,
238	// since pulling in one element may create new undefined symbols which
239	// may be satisfied by other objects in the archive.
240
241	void
7e1edb90 ILT	242	Archive::add_symbols(Symbol_table* symtab, Layout* layout,
7e1edb90 ILT	243	Input_objects* input_objects)
61ba1cf9	244	{
4973341a	245	if (this->input_file_->options().include_whole_archive())
7e1edb90	246	return this->include_all_members(symtab, layout, input_objects);
4973341a	247
ead1e424	248	const size_t armap_size = this->armap_.size();
61ba1cf9	249
e243ffc6	250	// This is a quick optimization, since we usually see many symbols
8c838dbd ILT	251	// in a row with the same offset. last_seen_offset holds the last
8c838dbd ILT	252	// offset we saw that was present in the seen_offsets_ set.
a93d6d07 ILT	253	off_t last_seen_offset = -1;
	254
	255	// Track which symbols in the symbol table we've already found to be
	256	// defined.
e243ffc6	257
61ba1cf9 ILT	258	bool added_new_object;
	259	do
	260	{
	261	added_new_object = false;
61ba1cf9 ILT	262	for (size_t i = 0; i < armap_size; ++i)
61ba1cf9 ILT	263	{
a93d6d07 ILT	264	if (this->armap_checked_[i])
	265	continue;
	266	if (this->armap_[i].offset == last_seen_offset)
	267	{
	268	this->armap_checked_[i] = true;
	269	continue;
	270	}
	271	if (this->seen_offsets_.find(this->armap_[i].offset)
	272	!= this->seen_offsets_.end())
61ba1cf9	273	{
a93d6d07 ILT	274	this->armap_checked_[i] = true;
a93d6d07 ILT	275	last_seen_offset = this->armap_[i].offset;
61ba1cf9 ILT	276	continue;
	277	}
	278
	279	Symbol* sym = symtab->lookup(this->armap_[i].name);
	280	if (sym == NULL)
	281	continue;
ead1e424	282	else if (!sym->is_undefined())
61ba1cf9	283	{
a93d6d07	284	this->armap_checked_[i] = true;
61ba1cf9 ILT	285	continue;
	286	}
	287	else if (sym->binding() == elfcpp::STB_WEAK)
	288	continue;
	289
	290	// We want to include this object in the link.
a93d6d07 ILT	291	last_seen_offset = this->armap_[i].offset;
	292	this->seen_offsets_.insert(last_seen_offset);
	293	this->armap_checked_[i] = true;
7e1edb90	294	this->include_member(symtab, layout, input_objects,
a93d6d07	295	last_seen_offset);
61ba1cf9 ILT	296	added_new_object = true;
	297	}
	298	}
	299	while (added_new_object);
	300	}
	301
4973341a ILT	302	// Include all the archive members in the link. This is for --whole-archive.
	303
	304	void
7e1edb90	305	Archive::include_all_members(Symbol_table* symtab, Layout* layout,
4973341a ILT	306	Input_objects* input_objects)
	307	{
	308	off_t off = sarmag;
	309	while (true)
	310	{
	311	off_t bytes;
	312	const unsigned char* p = this->get_view(off, sizeof(Archive_header),
	313	&bytes);
	314	if (bytes < sizeof(Archive_header))
	315	{
	316	if (bytes != 0)
	317	{
	318	fprintf(stderr, _("%s: %s: short archive header at %ld\n"),
	319	program_name, this->name().c_str(),
	320	static_cast<long>(off));
	321	gold_exit(false);
	322	}
	323
	324	break;
	325	}
	326
	327	const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
	328	std::string name;
	329	off_t size = this->interpret_header(hdr, off, &name);
	330	if (name.empty())
	331	{
	332	// Symbol table.
	333	}
	334	else if (name == "/")
	335	{
	336	// Extended name table.
	337	}
	338	else
7e1edb90	339	this->include_member(symtab, layout, input_objects, off);
4973341a ILT	340
	341	off += sizeof(Archive_header) + size;
	342	if ((off & 1) != 0)
	343	++off;
	344	}
	345	}
	346
61ba1cf9 ILT	347	// Include an archive member in the link. OFF is the file offset of
	348	// the member header.
	349
	350	void
7e1edb90 ILT	351	Archive::include_member(Symbol_table* symtab, Layout* layout,
7e1edb90 ILT	352	Input_objects* input_objects, off_t off)
61ba1cf9 ILT	353	{
	354	std::string n;
	355	this->read_header(off, &n);
	356
	357	size_t memoff = off + sizeof(Archive_header);
	358
	359	// Read enough of the file to pick up the entire ELF header.
	360	int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
	361	off_t bytes;
	362	const unsigned char* p = this->input_file_->file().get_view(memoff,
	363	ehdr_size,
	364	&bytes);
	365	if (bytes < 4)
	366	{
	367	fprintf(stderr, _("%s: %s: member at %ld is not an ELF object"),
	368	program_name, this->name().c_str(),
	369	static_cast<long>(off));
	370	gold_exit(false);
	371	}
	372
	373	static unsigned char elfmagic[4] =
	374	{
	375	elfcpp::ELFMAG0, elfcpp::ELFMAG1,
	376	elfcpp::ELFMAG2, elfcpp::ELFMAG3
	377	};
	378	if (memcmp(p, elfmagic, 4) != 0)
	379	{
	380	fprintf(stderr, _("%s: %s: member at %ld is not an ELF object"),
	381	program_name, this->name().c_str(),
	382	static_cast<long>(off));
	383	gold_exit(false);
	384	}
	385
92e059d8	386	Object* obj = make_elf_object((std::string(this->input_file_->filename())
61ba1cf9 ILT	387	+ "(" + n + ")"),
	388	this->input_file_, memoff, p, bytes);
	389
	390	input_objects->add_object(obj);
	391
12e14209 ILT	392	Read_symbols_data sd;
12e14209 ILT	393	obj->read_symbols(&sd);
7e1edb90	394	obj->layout(symtab, layout, &sd);
12e14209	395	obj->add_symbols(symtab, &sd);
61ba1cf9 ILT	396	}
	397
	398	// Add_archive_symbols methods.
	399
	400	Add_archive_symbols::~Add_archive_symbols()
	401	{
	402	if (this->this_blocker_ != NULL)
	403	delete this->this_blocker_;
	404	// next_blocker_ is deleted by the task associated with the next
	405	// input file.
	406	}
	407
	408	// Return whether we can add the archive symbols. We are blocked by
	409	// this_blocker_. We block next_blocker_. We also lock the file.
	410
	411	Task::Is_runnable_type
	412	Add_archive_symbols::is_runnable(Workqueue*)
	413	{
	414	if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
	415	return IS_BLOCKED;
	416	return IS_RUNNABLE;
	417	}
	418
	419	class Add_archive_symbols::Add_archive_symbols_locker : public Task_locker
	420	{
	421	public:
	422	Add_archive_symbols_locker(Task_token& token, Workqueue* workqueue,
ead1e424 ILT	423	File_read& file)
ead1e424 ILT	424	: blocker_(token, workqueue), filelock_(file)
61ba1cf9 ILT	425	{ }
	426
	427	private:
	428	Task_locker_block blocker_;
4973341a	429	Task_locker_obj<File_read> filelock_;
61ba1cf9 ILT	430	};
	431
	432	Task_locker*
	433	Add_archive_symbols::locks(Workqueue* workqueue)
	434	{
	435	return new Add_archive_symbols_locker(*this->next_blocker_,
	436	workqueue,
ead1e424	437	this->archive_->file());
61ba1cf9 ILT	438	}
	439
	440	void
	441	Add_archive_symbols::run(Workqueue*)
	442	{
7e1edb90 ILT	443	this->archive_->add_symbols(this->symtab_, this->layout_,
7e1edb90 ILT	444	this->input_objects_);
ead1e424 ILT	445
	446	if (this->input_group_ != NULL)
	447	this->input_group_->add_archive(this->archive_);
	448	else
	449	{
	450	// We no longer need to know about this archive.
	451	delete this->archive_;
	452	}
61ba1cf9 ILT	453	}
	454
	455	} // End namespace gold.