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] =
// table.
void
-Archive::setup()
+Archive::setup(Input_objects* input_objects)
{
// We need to ignore empty archives.
if (this->input_file_->file().filesize() == sarmag)
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;
+#endif
+ if (preread_syms)
+ this->read_all_symbols(input_objects);
}
// 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)
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, Mapfile* mapfile)
-{
- if (this->input_file_->options().whole_archive())
- return this->include_all_members(symtab, layout, input_objects,
- mapfile);
-
- input_objects->archive_start(this);
-
- 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].file_offset == last_seen_offset)
- {
- this->armap_checked_[i] = true;
- continue;
- }
- if (this->seen_offsets_.find(this->armap_[i].file_offset)
- != this->seen_offsets_.end())
- {
- this->armap_checked_[i] = true;
- last_seen_offset = this->armap_[i].file_offset;
- continue;
- }
-
- const char* sym_name = (this->armap_names_.data()
- + this->armap_[i].name_offset);
- Symbol* sym = symtab->lookup(sym_name);
- if (sym == NULL)
- {
- // 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;
- continue;
- }
- else if (sym->binding() == elfcpp::STB_WEAK)
- continue;
-
- // We want to include this object in the link.
- last_seen_offset = this->armap_[i].file_offset;
- this->seen_offsets_.insert(last_seen_offset);
- this->armap_checked_[i] = true;
-
- std::string why;
- if (sym == NULL)
- {
- why = "-u ";
- why += sym_name;
- }
- this->include_member(symtab, layout, input_objects,
- last_seen_offset, mapfile, sym, why.c_str());
-
- added_new_object = true;
- }
- }
- while (added_new_object);
-
- input_objects->archive_stop(this);
-}
-
// An archive member iterator.
class Archive::const_iterator
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_objects* input_objects,
+ Input_file** input_file, off_t* memoff,
+ std::string* member_name)
+{
+ off_t nested_off;
+
+ 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->name().c_str();
+ const char* basename = lbasename(arch_path);
+ if (basename > arch_path)
+ member_name->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(*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(), false, "", false,
+ parameters->options());
+ *input_file = new Input_file(input_file_arg);
+ if (!(*input_file)->open(parameters->options(), *this->dirpath_,
+ this->task_))
+ return false;
+ arch = new Archive(*member_name, *input_file, false, this->dirpath_,
+ this->task_);
+ arch->setup(input_objects);
+ 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_objects,
+ input_file, memoff, 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(), false, "", false,
+ this->input_file_->options());
+ *input_file = new Input_file(input_file_arg);
+ if (!(*input_file)->open(parameters->options(), *this->dirpath_,
+ this->task_))
+ return false;
+
+ *memoff = 0;
+ return true;
+}
+
+// Return an ELF object for the member at offset OFF. Set *MEMBER_NAME to
+// the name of the member.
+
+Object*
+Archive::get_elf_object_for_member(off_t off, Input_objects* input_objects)
+{
+ std::string member_name;
+ Input_file* input_file;
+ off_t memoff;
+
+ if (!this->get_file_and_offset(off, input_objects, &input_file, &memoff,
+ &member_name))
+ return NULL;
+
+ 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)
+ {
+ gold_error(_("%s: member at %zu is not an ELF object"),
+ this->name().c_str(), static_cast<size_t>(off));
+ return NULL;
+ }
+
+ const unsigned char* ehdr = input_file->file().get_view(memoff, 0, read_size,
+ true, false);
+
+ static unsigned char elfmagic[4] =
+ {
+ elfcpp::ELFMAG0, elfcpp::ELFMAG1,
+ elfcpp::ELFMAG2, elfcpp::ELFMAG3
+ };
+ if (memcmp(ehdr, elfmagic, 4) != 0)
+ {
+ gold_error(_("%s: member at %zu is not an ELF object"),
+ this->name().c_str(), static_cast<size_t>(off));
+ return NULL;
+ }
+
+ return make_elf_object((std::string(this->input_file_->filename())
+ + "(" + member_name + ")"),
+ input_file, memoff, ehdr, read_size);
+}
+
+// Read the symbols from all the archive members in the link.
+
+void
+Archive::read_all_symbols(Input_objects* input_objects)
+{
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
+ this->read_symbols(input_objects, 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(Input_objects* input_objects, off_t off)
+{
+ Object* obj = this->get_elf_object_for_member(off, input_objects);
+
+ 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.
+
+void
+Archive::add_symbols(Symbol_table* symtab, Layout* layout,
+ 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,
+ mapfile);
+
+ Archive::total_members += this->num_members_;
+
+ input_objects->archive_start(this);
+
+ 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].file_offset == last_seen_offset)
+ {
+ this->armap_checked_[i] = true;
+ continue;
+ }
+ if (this->seen_offsets_.find(this->armap_[i].file_offset)
+ != this->seen_offsets_.end())
+ {
+ this->armap_checked_[i] = true;
+ last_seen_offset = this->armap_[i].file_offset;
+ continue;
+ }
+
+ const char* sym_name = (this->armap_names_.data()
+ + this->armap_[i].name_offset);
+ Symbol* sym = symtab->lookup(sym_name);
+ if (sym == NULL)
+ {
+ // 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;
+ continue;
+ }
+ else if (sym->binding() == elfcpp::STB_WEAK)
+ continue;
+
+ // We want to include this object in the link.
+ last_seen_offset = this->armap_[i].file_offset;
+ this->seen_offsets_.insert(last_seen_offset);
+ this->armap_checked_[i] = true;
+
+ std::string why;
+ if (sym == NULL)
+ {
+ why = "-u ";
+ why += sym_name;
+ }
+ this->include_member(symtab, layout, input_objects,
+ last_seen_offset, mapfile, sym, why.c_str());
+
+ added_new_object = true;
+ }
+ }
+ while (added_new_object);
+
+ input_objects->archive_stop(this);
+}
+
// Include all the archive members in the link. This is for --whole-archive.
void
{
input_objects->archive_start(this);
- for (Archive::const_iterator p = this->begin();
- p != this->end();
- ++p)
- this->include_member(symtab, layout, input_objects, p->off,
- mapfile, NULL, "--whole-archive");
+ if (this->members_.size() > 0)
+ {
+ std::map<off_t, Archive_member>::const_iterator p;
+ for (p = this->members_.begin();
+ p != this->members_.end();
+ ++p)
+ {
+ this->include_member(symtab, layout, input_objects, p->first,
+ mapfile, NULL, "--whole-archive");
+ ++Archive::total_members;
+ }
+ }
+ else
+ {
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
+ {
+ this->include_member(symtab, layout, input_objects, p->off,
+ mapfile, NULL, "--whole-archive");
+ ++Archive::total_members;
+ }
+ }
input_objects->archive_stop(this);
}
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);
-
- if (mapfile != NULL)
- mapfile->report_include_archive_member(this, n, sym, why);
+ ++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()))
+ 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))
{
- 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));
+ obj->layout(symtab, layout, sd);
+ obj->add_symbols(symtab, sd);
}
- 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,
- NULL, NULL, NULL);
- 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_))
- {
- return;
- }
- memoff = 0;
- }
-
- 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)
- {
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
+ delete sd;
return;
}
- const unsigned char* ehdr = input_file->file().get_view(memoff, 0, read_size,
- true, false);
-
- static unsigned char elfmagic[4] =
- {
- elfcpp::ELFMAG0, elfcpp::ELFMAG1,
- elfcpp::ELFMAG2, elfcpp::ELFMAG3
- };
- if (memcmp(ehdr, elfmagic, 4) != 0)
- {
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
- return;
- }
+ Object* obj = this->get_elf_object_for_member(off, input_objects);
+ if (obj == NULL)
+ return;
- Object* obj = make_elf_object((std::string(this->input_file_->filename())
- + "(" + n + ")"),
- input_file, memoff, ehdr, read_size);
+ if (mapfile != NULL)
+ mapfile->report_include_archive_member(obj->name(), sym, why);
if (input_objects->add_object(obj))
{
// FIXME: We need to close the descriptor here.
delete obj;
}
+}
- if (this->is_thin_archive_)
- {
- // Opening the file locked it. Unlock it now.
- input_file->file().unlock(this->task_);
- }
+// 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.
class Input_group;
class Layout;
class Symbol_table;
+class Object;
+class Read_symbols_data;
// This class represents an archive--generally a libNAME.a file.
// Archives have a symbol table and a list of objects.
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_(),
- is_thin_archive_(is_thin_archive), dirpath_(dirpath), task_(task)
+ extended_names_(), armap_checked_(), seen_offsets_(), members_(),
+ is_thin_archive_(is_thin_archive), nested_archives_(),
+ dirpath_(dirpath), task_(task), num_members_(0)
{ }
// The length of the magic string at the start of an archive.
// Set up the archive: read the symbol map.
void
- setup();
+ setup(Input_objects*);
// Get a reference to the underlying file.
File_read&
void
add_symbols(Symbol_table*, Layout*, Input_objects*, Mapfile*);
+ // Dump statistical information to stderr.
+ static void
+ print_stats();
+
// Return the number of members in the archive.
size_t
count_members();
struct Archive_header;
+ // Total number of archives seen.
+ static unsigned int total_archives;
+ // Total number of archive members seen.
+ static unsigned int total_members;
+ // Number of archive members loaded.
+ static unsigned int total_members_loaded;
+
// Get a view into the underlying file.
const unsigned char*
get_view(off_t start, section_size_type size, bool aligned, bool cache)
interpret_header(const Archive_header* hdr, off_t off, std::string* pname,
off_t* nested_off) const;
+ // 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
+ get_file_and_offset(off_t off, Input_objects* input_objects,
+ Input_file** input_file, off_t* memoff,
+ std::string* member_name);
+
+ // Return an ELF object for the member at offset OFF. Set *MEMBER_NAME to
+ // the name of the member.
+ Object*
+ get_elf_object_for_member(off_t off, Input_objects* input_objects);
+
+ // Read the symbols from all the archive members in the link.
+ void
+ read_all_symbols(Input_objects* input_objects);
+
+ // Read the symbols from an archive member in the link. OFF is the file
+ // offset of the member header.
+ void
+ read_symbols(Input_objects* input_objects, off_t off);
+
// Include all the archive members in the link.
void
include_all_members(Symbol_table*, Layout*, Input_objects*, Mapfile*);
off_t file_offset;
};
+ // An entry in the archive map of offsets to members.
+ struct Archive_member
+ {
+ Archive_member()
+ : obj_(NULL), sd_(NULL)
+ { }
+ Archive_member(Object* obj, Read_symbols_data* sd)
+ : obj_(obj), sd_(sd)
+ { }
+ // The object file.
+ Object* obj_;
+ // The data to pass from read_symbols() to add_symbols().
+ Read_symbols_data* sd_;
+ };
+
// A simple hash code for off_t values.
class Seen_hash
{
std::vector<bool> armap_checked_;
// Track which elements have been included by offset.
Unordered_set<off_t, Seen_hash> seen_offsets_;
+ // Table of objects whose symbols have been pre-read.
+ std::map<off_t, Archive_member> members_;
// True if this is a thin archive.
const bool is_thin_archive_;
// Table of nested archives, indexed by filename.
Dirsearch* dirpath_;
// The task reading this archive.
Task *task_;
+ // Number of members in this archive;
+ unsigned int num_members_;
};
// This class is used to read an archive and pick out the desired
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