// archive.cc -- archive support for gold
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "elfcpp.h"
#include "options.h"
+#include "mapfile.h"
#include "fileread.h"
#include "readsyms.h"
#include "symtab.h"
#include "object.h"
#include "archive.h"
+#include "plugin.h"
namespace gold
{
char ar_fmag[2];
};
+// Class Archive static variables.
+unsigned int Archive::total_archives;
+unsigned int Archive::total_members;
+unsigned int Archive::total_members_loaded;
+
// Archive methods.
const char Archive::armag[sarmag] =
const char Archive::arfmag[2] = { '`', '\n' };
+Archive::Archive(const std::string& name, Input_file* input_file,
+ bool is_thin_archive, Dirsearch* dirpath, Task* task)
+ : name_(name), input_file_(input_file), armap_(), armap_names_(),
+ extended_names_(), armap_checked_(), seen_offsets_(), members_(),
+ is_thin_archive_(is_thin_archive), included_member_(false),
+ nested_archives_(), dirpath_(dirpath), task_(task), num_members_(0)
+{
+ this->no_export_ =
+ parameters->options().check_excluded_libs(input_file->found_name());
+}
+
// Set up the archive: read the symbol map and the extended name
// table.
const char* px = reinterpret_cast<const char*>(p);
this->extended_names_.assign(px, extended_size);
}
+ bool preread_syms = (parameters->options().threads()
+ && parameters->options().preread_archive_symbols());
+#ifndef ENABLE_THREADS
+ preread_syms = false;
+#else
+ if (parameters->options().has_plugins())
+ preread_syms = false;
+#endif
+ if (preread_syms)
+ this->read_all_symbols();
}
// Unlock any nested archives.
void
Archive::read_armap(off_t start, section_size_type size)
{
+ // To count the total number of archive members, we'll just count
+ // the number of times the file offset changes. Since most archives
+ // group the symbols in the armap by object, this ought to give us
+ // an accurate count.
+ off_t last_seen_offset = -1;
+
// Read in the entire armap.
const unsigned char* p = this->get_view(start, size, true, false);
this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
name_offset += strlen(pnames + name_offset) + 1;
++pword;
+ if (this->armap_[i].file_offset != last_seen_offset)
+ {
+ last_seen_offset = this->armap_[i].file_offset;
+ ++this->num_members_;
+ }
}
if (static_cast<section_size_type>(name_offset) > names_size)
off_t
Archive::interpret_header(const Archive_header* hdr, off_t off,
- std::string* pname, off_t* nested_off)
+ std::string* pname, off_t* nested_off) const
{
if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
{
return member_size;
}
+// An archive member iterator.
+
+class Archive::const_iterator
+{
+ public:
+ // The header of an archive member. This is what this iterator
+ // points to.
+ struct Header
+ {
+ // The name of the member.
+ std::string name;
+ // The file offset of the member.
+ off_t off;
+ // The file offset of a nested archive member.
+ off_t nested_off;
+ // The size of the member.
+ off_t size;
+ };
+
+ const_iterator(Archive* archive, off_t off)
+ : archive_(archive), off_(off)
+ { this->read_next_header(); }
+
+ const Header&
+ operator*() const
+ { return this->header_; }
+
+ const Header*
+ operator->() const
+ { return &this->header_; }
+
+ const_iterator&
+ operator++()
+ {
+ if (this->off_ == this->archive_->file().filesize())
+ return *this;
+ this->off_ += sizeof(Archive_header);
+ if (!this->archive_->is_thin_archive())
+ this->off_ += this->header_.size;
+ if ((this->off_ & 1) != 0)
+ ++this->off_;
+ this->read_next_header();
+ return *this;
+ }
+
+ const_iterator
+ operator++(int)
+ {
+ const_iterator ret = *this;
+ ++*this;
+ return ret;
+ }
+
+ bool
+ operator==(const const_iterator p) const
+ { return this->off_ == p->off; }
+
+ bool
+ operator!=(const const_iterator p) const
+ { return this->off_ != p->off; }
+
+ private:
+ void
+ read_next_header();
+
+ // The underlying archive.
+ Archive* archive_;
+ // The current offset in the file.
+ off_t off_;
+ // The current archive header.
+ Header header_;
+};
+
+// Read the next archive header.
+
+void
+Archive::const_iterator::read_next_header()
+{
+ off_t filesize = this->archive_->file().filesize();
+ while (true)
+ {
+ if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header)))
+ {
+ if (filesize != this->off_)
+ {
+ gold_error(_("%s: short archive header at %zu"),
+ this->archive_->filename().c_str(),
+ static_cast<size_t>(this->off_));
+ this->off_ = filesize;
+ }
+ this->header_.off = filesize;
+ return;
+ }
+
+ unsigned char buf[sizeof(Archive_header)];
+ this->archive_->file().read(this->off_, sizeof(Archive_header), buf);
+
+ const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf);
+ this->header_.size =
+ this->archive_->interpret_header(hdr, this->off_, &this->header_.name,
+ &this->header_.nested_off);
+ this->header_.off = this->off_;
+
+ // Skip special members.
+ if (!this->header_.name.empty() && this->header_.name != "/")
+ return;
+
+ this->off_ += sizeof(Archive_header) + this->header_.size;
+ if ((this->off_ & 1) != 0)
+ ++this->off_;
+ }
+}
+
+// Initial iterator.
+
+Archive::const_iterator
+Archive::begin()
+{
+ return Archive::const_iterator(this, sarmag);
+}
+
+// Final iterator.
+
+Archive::const_iterator
+Archive::end()
+{
+ return Archive::const_iterator(this, this->input_file_->file().filesize());
+}
+
+// Get the file and offset for an archive member, which may be an
+// external member of a thin archive. Set *INPUT_FILE to the
+// file containing the actual member, *MEMOFF to the offset
+// within that file (0 if not a nested archive), and *MEMBER_NAME
+// to the name of the archive member. Return TRUE on success.
+
+bool
+Archive::get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff,
+ off_t* memsize, std::string* member_name)
+{
+ off_t nested_off;
+
+ *memsize = this->read_header(off, false, member_name, &nested_off);
+
+ *input_file = this->input_file_;
+ *memoff = off + static_cast<off_t>(sizeof(Archive_header));
+
+ if (!this->is_thin_archive_)
+ return true;
+
+ // Adjust a relative pathname so that it is relative
+ // to the directory containing the archive.
+ if (!IS_ABSOLUTE_PATH(member_name->c_str()))
+ {
+ const char* arch_path = this->filename().c_str();
+ const char* basename = lbasename(arch_path);
+ if (basename > arch_path)
+ member_name->replace(0, 0,
+ this->filename().substr(0, basename - arch_path));
+ }
+
+ if (nested_off > 0)
+ {
+ // This is a member of a nested archive. Open the containing
+ // archive if we don't already have it open, then do a recursive
+ // call to include the member from that archive.
+ Archive* arch;
+ Nested_archive_table::const_iterator p =
+ this->nested_archives_.find(*member_name);
+ if (p != this->nested_archives_.end())
+ arch = p->second;
+ else
+ {
+ Input_file_argument* input_file_arg =
+ new Input_file_argument(member_name->c_str(),
+ Input_file_argument::INPUT_FILE_TYPE_FILE,
+ "", false, parameters->options());
+ *input_file = new Input_file(input_file_arg);
+ int dummy = 0;
+ if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
+ return false;
+ arch = new Archive(*member_name, *input_file, false, this->dirpath_,
+ this->task_);
+ arch->setup();
+ std::pair<Nested_archive_table::iterator, bool> ins =
+ this->nested_archives_.insert(std::make_pair(*member_name, arch));
+ gold_assert(ins.second);
+ }
+ return arch->get_file_and_offset(nested_off, input_file, memoff,
+ memsize, member_name);
+ }
+
+ // This is an external member of a thin archive. Open the
+ // file as a regular relocatable object file.
+ Input_file_argument* input_file_arg =
+ new Input_file_argument(member_name->c_str(),
+ Input_file_argument::INPUT_FILE_TYPE_FILE,
+ "", false, this->input_file_->options());
+ *input_file = new Input_file(input_file_arg);
+ int dummy = 0;
+ if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy))
+ return false;
+
+ *memoff = 0;
+ *memsize = (*input_file)->file().filesize();
+ return true;
+}
+
+// Return an ELF object for the member at offset OFF. If the ELF
+// object has an unsupported target type, set *PUNCONFIGURED to true
+// and return NULL.
+
+Object*
+Archive::get_elf_object_for_member(off_t off, bool* punconfigured)
+{
+ *punconfigured = false;
+
+ Input_file* input_file;
+ off_t memoff;
+ off_t memsize;
+ std::string member_name;
+ if (!this->get_file_and_offset(off, &input_file, &memoff, &memsize,
+ &member_name))
+ return NULL;
+
+ if (parameters->options().has_plugins())
+ {
+ Object* obj = parameters->options().plugins()->claim_file(input_file,
+ memoff,
+ memsize);
+ if (obj != NULL)
+ {
+ // The input file was claimed by a plugin, and its symbols
+ // have been provided by the plugin.
+ return obj;
+ }
+ }
+
+ const unsigned char* ehdr;
+ int read_size;
+ if (!is_elf_object(input_file, memoff, &ehdr, &read_size))
+ {
+ gold_error(_("%s: member at %zu is not an ELF object"),
+ this->name().c_str(), static_cast<size_t>(off));
+ return NULL;
+ }
+
+ Object *obj = make_elf_object((std::string(this->input_file_->filename())
+ + "(" + member_name + ")"),
+ input_file, memoff, ehdr, read_size,
+ punconfigured);
+ if (obj == NULL)
+ return NULL;
+ obj->set_no_export(this->no_export());
+ return obj;
+}
+
+// Read the symbols from all the archive members in the link.
+
+void
+Archive::read_all_symbols()
+{
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
+ this->read_symbols(p->off);
+}
+
+// Read the symbols from an archive member in the link. OFF is the file
+// offset of the member header.
+
+void
+Archive::read_symbols(off_t off)
+{
+ bool dummy;
+ Object* obj = this->get_elf_object_for_member(off, &dummy);
+
+ if (obj == NULL)
+ return;
+
+ Read_symbols_data* sd = new Read_symbols_data;
+ obj->read_symbols(sd);
+ Archive_member member(obj, sd);
+ this->members_[off] = member;
+}
+
// 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.
+// may be satisfied by other objects in the archive. Return true in
+// the normal case, false if the first member we tried to add from
+// this archive had an incompatible target.
-void
+bool
Archive::add_symbols(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects)
+ Input_objects* input_objects, Mapfile* mapfile)
{
+ ++Archive::total_archives;
+
if (this->input_file_->options().whole_archive())
- return this->include_all_members(symtab, layout, input_objects);
+ return this->include_all_members(symtab, layout, input_objects,
+ mapfile);
+
+ Archive::total_members += this->num_members_;
+
+ input_objects->archive_start(this);
const size_t armap_size = this->armap_.size();
// Track which symbols in the symbol table we've already found to be
// defined.
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
bool added_new_object;
do
{
const char* sym_name = (this->armap_names_.data()
+ this->armap_[i].name_offset);
- Symbol* sym = symtab->lookup(sym_name);
+
+ // In an object file, and therefore in an archive map, an
+ // '@' in the name separates the symbol name from the
+ // version name. If there are two '@' characters, this is
+ // the default version.
+ const char* ver = strchr(sym_name, '@');
+ bool def = false;
+ if (ver != NULL)
+ {
+ size_t symlen = ver - sym_name;
+ if (symlen + 1 > tmpbuflen)
+ {
+ tmpbuf = static_cast<char*>(realloc(tmpbuf, symlen + 1));
+ tmpbuflen = symlen + 1;
+ }
+ memcpy(tmpbuf, sym_name, symlen);
+ tmpbuf[symlen] = '\0';
+ sym_name = tmpbuf;
+
+ ++ver;
+ if (*ver == '@')
+ {
+ ++ver;
+ def = true;
+ }
+ }
+
+ Symbol* sym = symtab->lookup(sym_name, ver);
+ if (def
+ && ver != NULL
+ && (sym == NULL
+ || !sym->is_undefined()
+ || sym->binding() == elfcpp::STB_WEAK))
+ sym = symtab->lookup(sym_name, NULL);
+
if (sym == NULL)
- continue;
+ {
+ // Check whether the symbol was named in a -u option.
+ if (!parameters->options().is_undefined(sym_name))
+ continue;
+ }
else if (!sym->is_undefined())
{
this->armap_checked_[i] = true;
last_seen_offset = this->armap_[i].file_offset;
this->seen_offsets_.insert(last_seen_offset);
this->armap_checked_[i] = true;
- this->include_member(symtab, layout, input_objects,
- last_seen_offset);
+
+ std::string why;
+ if (sym == NULL)
+ {
+ why = "-u ";
+ why += sym_name;
+ }
+ if (!this->include_member(symtab, layout, input_objects,
+ last_seen_offset, mapfile, sym,
+ why.c_str()))
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return false;
+ }
+
added_new_object = true;
}
}
while (added_new_object);
+
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+
+ input_objects->archive_stop(this);
+
+ return true;
}
// Include all the archive members in the link. This is for --whole-archive.
-void
+bool
Archive::include_all_members(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects)
+ Input_objects* input_objects, Mapfile* mapfile)
{
- off_t off = sarmag;
- off_t filesize = this->input_file_->file().filesize();
- while (true)
- {
- if (filesize - off < static_cast<off_t>(sizeof(Archive_header)))
- {
- if (filesize != off)
- gold_error(_("%s: short archive header at %zu"),
- this->name().c_str(), static_cast<size_t>(off));
- break;
- }
+ input_objects->archive_start(this);
- unsigned char hdr_buf[sizeof(Archive_header)];
- this->input_file_->file().read(off, sizeof(Archive_header), hdr_buf);
-
- const Archive_header* hdr =
- reinterpret_cast<const Archive_header*>(hdr_buf);
- std::string name;
- off_t size = this->interpret_header(hdr, off, &name, NULL);
- if (name.empty())
+ if (this->members_.size() > 0)
+ {
+ std::map<off_t, Archive_member>::const_iterator p;
+ for (p = this->members_.begin();
+ p != this->members_.end();
+ ++p)
{
- // Symbol table.
+ if (!this->include_member(symtab, layout, input_objects, p->first,
+ mapfile, NULL, "--whole-archive"))
+ return false;
+ ++Archive::total_members;
}
- else if (name == "/")
+ }
+ else
+ {
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
{
- // Extended name table.
+ if (!this->include_member(symtab, layout, input_objects, p->off,
+ mapfile, NULL, "--whole-archive"))
+ return false;
+ ++Archive::total_members;
}
- else
- this->include_member(symtab, layout, input_objects, off);
-
- off += sizeof(Archive_header);
- if (!this->is_thin_archive_)
- off += size;
- if ((off & 1) != 0)
- ++off;
}
+
+ input_objects->archive_stop(this);
+
+ return true;
+}
+
+// Return the number of members in the archive. This is only used for
+// reports.
+
+size_t
+Archive::count_members()
+{
+ size_t ret = 0;
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
+ ++ret;
+ return ret;
}
// Include an archive member in the link. OFF is the file offset of
-// the member header.
+// the member header. WHY is the reason we are including this member.
+// Return true if we added the member or if we had an error, return
+// false if this was the first member we tried to add from this
+// archive and it had an incompatible format.
-void
+bool
Archive::include_member(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects, off_t off)
+ Input_objects* input_objects, off_t off,
+ Mapfile* mapfile, Symbol* sym, const char* why)
{
- std::string n;
- off_t nested_off;
- this->read_header(off, false, &n, &nested_off);
+ ++Archive::total_members_loaded;
- Input_file* input_file;
- off_t memoff;
-
- if (!this->is_thin_archive_)
+ std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
+ if (p != this->members_.end())
{
- input_file = this->input_file_;
- memoff = off + static_cast<off_t>(sizeof(Archive_header));
- }
- else
- {
- // Adjust a relative pathname so that it is relative
- // to the directory containing the archive.
- if (!IS_ABSOLUTE_PATH(n.c_str()))
- {
- const char *arch_path = this->name().c_str();
- const char *basename = lbasename(arch_path);
- if (basename > arch_path)
- n.replace(0, 0, this->name().substr(0, basename - arch_path));
- }
- if (nested_off > 0)
- {
- // This is a member of a nested archive. Open the containing
- // archive if we don't already have it open, then do a recursive
- // call to include the member from that archive.
- Archive* arch;
- Nested_archive_table::const_iterator p =
- this->nested_archives_.find(n);
- if (p != this->nested_archives_.end())
- arch = p->second;
- else
- {
- Input_file_argument* input_file_arg =
- new Input_file_argument(n.c_str(), false, "", false,
- parameters->options());
- input_file = new Input_file(input_file_arg);
- if (!input_file->open(parameters->options(), *this->dirpath_,
- this->task_))
- return;
- arch = new Archive(n, input_file, false, this->dirpath_,
- this->task_);
- arch->setup();
- std::pair<Nested_archive_table::iterator, bool> ins =
- this->nested_archives_.insert(std::make_pair(n, arch));
- gold_assert(ins.second);
- }
- arch->include_member(symtab, layout, input_objects, nested_off);
- return;
- }
- // This is an external member of a thin archive. Open the
- // file as a regular relocatable object file.
- Input_file_argument* input_file_arg =
- new Input_file_argument(n.c_str(), false, "", false,
- this->input_file_->options());
- input_file = new Input_file(input_file_arg);
- if (!input_file->open(parameters->options(), *this->dirpath_,
- this->task_))
+ Object *obj = p->second.obj_;
+
+ Read_symbols_data *sd = p->second.sd_;
+ if (mapfile != NULL)
+ mapfile->report_include_archive_member(obj->name(), sym, why);
+ if (input_objects->add_object(obj))
{
- return;
+ obj->layout(symtab, layout, sd);
+ obj->add_symbols(symtab, sd, layout);
+ this->included_member_ = true;
}
- memoff = 0;
+ delete sd;
+ return true;
}
- // Read enough of the file to pick up the entire ELF header.
- unsigned char ehdr_buf[elfcpp::Elf_sizes<64>::ehdr_size];
+ bool unconfigured;
+ Object* obj = this->get_elf_object_for_member(off, &unconfigured);
- off_t filesize = input_file->file().filesize();
- int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
- if (filesize - memoff < read_size)
- read_size = filesize - memoff;
-
- if (read_size < 4)
+ if (!this->included_member_
+ && this->searched_for()
+ && obj == NULL
+ && unconfigured)
{
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
- return;
+ if (obj != NULL)
+ delete obj;
+ return false;
}
- input_file->file().read(memoff, read_size, ehdr_buf);
+ if (obj == NULL)
+ return true;
- static unsigned char elfmagic[4] =
- {
- elfcpp::ELFMAG0, elfcpp::ELFMAG1,
- elfcpp::ELFMAG2, elfcpp::ELFMAG3
- };
- if (memcmp(ehdr_buf, elfmagic, 4) != 0)
+ if (mapfile != NULL)
+ mapfile->report_include_archive_member(obj->name(), sym, why);
+
+ Pluginobj* pluginobj = obj->pluginobj();
+ if (pluginobj != NULL)
{
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
- return;
+ pluginobj->add_symbols(symtab, NULL, layout);
+ this->included_member_ = true;
+ return true;
}
- Object* obj = make_elf_object((std::string(this->input_file_->filename())
- + "(" + n + ")"),
- input_file, memoff, ehdr_buf,
- read_size);
-
- if (input_objects->add_object(obj))
+ if (!input_objects->add_object(obj))
+ delete obj;
+ else
{
Read_symbols_data sd;
obj->read_symbols(&sd);
obj->layout(symtab, layout, &sd);
- obj->add_symbols(symtab, &sd);
- }
- else
- {
- // FIXME: We need to close the descriptor here.
- delete obj;
- }
+ obj->add_symbols(symtab, &sd, layout);
- if (this->is_thin_archive_)
- {
- // Opening the file locked it. Unlock it now.
- input_file->file().unlock(this->task_);
+ // If this is an external member of a thin archive, unlock the file
+ // for the next task.
+ if (obj->offset() == 0)
+ obj->unlock(this->task_);
+
+ this->included_member_ = true;
}
+
+ return true;
+}
+
+// Print statistical information to stderr. This is used for --stats.
+
+void
+Archive::print_stats()
+{
+ fprintf(stderr, _("%s: archive libraries: %u\n"),
+ program_name, Archive::total_archives);
+ fprintf(stderr, _("%s: total archive members: %u\n"),
+ program_name, Archive::total_members);
+ fprintf(stderr, _("%s: loaded archive members: %u\n"),
+ program_name, Archive::total_members_loaded);
}
// Add_archive_symbols methods.
}
void
-Add_archive_symbols::run(Workqueue*)
+Add_archive_symbols::run(Workqueue* workqueue)
{
- this->archive_->add_symbols(this->symtab_, this->layout_,
- this->input_objects_);
-
+ bool added = this->archive_->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_,
+ this->mapfile_);
this->archive_->unlock_nested_archives();
this->archive_->release();
this->archive_->clear_uncached_views();
+ if (!added)
+ {
+ // This archive holds object files which are incompatible with
+ // our output file.
+ Read_symbols::incompatible_warning(this->input_argument_,
+ this->archive_->input_file());
+ Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
+ this->layout_, this->dirpath_, this->dirindex_,
+ this->mapfile_, this->input_argument_,
+ this->input_group_, this->next_blocker_);
+ delete this->archive_;
+ return;
+ }
+
if (this->input_group_ != NULL)
this->input_group_->add_archive(this->archive_);
else
projects / deliverable / binutils-gdb.git / blobdiff