// archive.cc -- archive support for gold
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
namespace gold
{
+// Library_base methods.
+
+// Determine whether a definition of SYM_NAME should cause an archive
+// library member to be included in the link. Returns SHOULD_INCLUDE_YES
+// if the symbol is referenced but not defined, SHOULD_INCLUDE_NO if the
+// symbol is already defined, and SHOULD_INCLUDE_UNKNOWN if the symbol is
+// neither referenced nor defined.
+
+Library_base::Should_include
+Library_base::should_include_member(Symbol_table* symtab, Layout* layout,
+ const char* sym_name, Symbol** symp,
+ std::string* why, char** tmpbufp,
+ size_t* tmpbuflen)
+{
+ // 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.
+ char* tmpbuf = *tmpbufp;
+ 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*>(xrealloc(tmpbuf, symlen + 1));
+ *tmpbufp = tmpbuf;
+ *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);
+
+ *symp = sym;
+
+ if (sym != NULL)
+ {
+ if (!sym->is_undefined())
+ return Library_base::SHOULD_INCLUDE_NO;
+
+ // PR 12001: Do not include an archive when the undefined
+ // symbol has actually been defined on the command line.
+ if (layout->script_options()->is_pending_assignment(sym_name))
+ return Library_base::SHOULD_INCLUDE_NO;
+
+ // If the symbol is weak undefined, we still need to check
+ // for other reasons (like a -u option).
+ if (sym->binding() != elfcpp::STB_WEAK)
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ // Check whether the symbol was named in a -u option.
+ if (parameters->options().is_undefined(sym_name))
+ {
+ *why = "-u ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ if (parameters->options().is_export_dynamic_symbol(sym_name))
+ {
+ *why = "--export-dynamic-symbol ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ if (layout->script_options()->is_referenced(sym_name))
+ {
+ size_t alc = 100 + strlen(sym_name);
+ char* buf = new char[alc];
+ snprintf(buf, alc, _("script or expression reference to %s"),
+ sym_name);
+ *why = buf;
+ delete[] buf;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ if (!parameters->options().relocatable())
+ {
+ const char* entry_sym = parameters->entry();
+ if (entry_sym != NULL && strcmp(sym_name, entry_sym) == 0)
+ {
+ *why = "entry symbol ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+ }
+
+ return Library_base::SHOULD_INCLUDE_UNKNOWN;
+}
+
// The header of an entry in the archive. This is all readable text,
// padded with spaces where necessary. If the contents of an archive
// are all text file, the entire archive is readable.
const char Archive::arfmag[2] = { '`', '\n' };
+const char Archive::sym64name[7] = { '/', 'S', 'Y', 'M', '6', '4', '/' };
+
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),
- incremental_info_(NULL)
+ : Library_base(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), num_members_(0),
+ included_all_members_(false)
{
this->no_export_ =
parameters->options().check_excluded_libs(input_file->found_name());
off_t off = sarmag;
if (armap_name.empty())
{
- this->read_armap(sarmag + sizeof(Archive_header), armap_size);
+ this->read_armap<32>(sarmag + sizeof(Archive_header), armap_size);
+ off = sarmag + sizeof(Archive_header) + armap_size;
+ }
+ else if (armap_name == "/SYM64/")
+ {
+ this->read_armap<64>(sarmag + sizeof(Archive_header), armap_size);
off = sarmag + sizeof(Archive_header) + armap_size;
}
else if (!this->input_file_->options().whole_archive())
// Read the archive symbol map.
+template<int mapsize>
void
Archive::read_armap(off_t start, section_size_type size)
{
const unsigned char* p = this->get_view(start, size, true, false);
// 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);
+ typedef typename elfcpp::Elf_types<mapsize>::Elf_Addr Entry_type;
+ const Entry_type* pword = reinterpret_cast<const Entry_type*>(p);
+ unsigned long nsyms = convert_types<unsigned long, Entry_type>(
+ elfcpp::Swap<mapsize, true>::readval(pword));
++pword;
// Note that the addition is in units of sizeof(elfcpp::Elf_Word).
this->armap_.resize(nsyms);
section_offset_type name_offset = 0;
- for (unsigned int i = 0; i < nsyms; ++i)
+ for (unsigned long i = 0; i < nsyms; ++i)
{
this->armap_[i].name_offset = name_offset;
- this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
+ this->armap_[i].file_offset = convert_types<off_t, Entry_type>(
+ elfcpp::Swap<mapsize, true>::readval(pword));
name_offset += strlen(pnames + name_offset) + 1;
++pword;
if (this->armap_[i].file_offset != last_seen_offset)
if (!pname->empty())
pname->clear();
}
+ else if (memcmp(hdr->ar_name, sym64name, sizeof sym64name) == 0)
+ {
+ // This is the symbol table, 64-bit version.
+ pname->assign(sym64name, sizeof sym64name);
+ }
else if (hdr->ar_name[1] == '/')
{
// This is the extended name table.
this->header_.off = this->off_;
// Skip special members.
- if (!this->header_.name.empty() && this->header_.name != "/")
+ if (!this->header_.name.empty()
+ && this->header_.name != "/"
+ && this->header_.name != "/SYM64/")
return;
this->off_ += sizeof(Archive_header) + this->header_.size;
&member_name))
return NULL;
+ const unsigned char* ehdr;
+ int read_size;
+ Object *obj = NULL;
+ bool is_elf_obj = false;
+ bool unclaimed = false;
+
+ if (is_elf_object(input_file, memoff, &ehdr, &read_size))
+ {
+ obj = make_elf_object((std::string(this->input_file_->filename())
+ + "(" + member_name + ")"),
+ input_file, memoff, ehdr, read_size,
+ punconfigured);
+ is_elf_obj = true;
+ }
+
if (parameters->options().has_plugins())
{
- Object* obj = parameters->options().plugins()->claim_file(input_file,
- memoff,
- memsize);
- if (obj != NULL)
+ Object* plugin_obj
+ = parameters->options().plugins()->claim_file(input_file,
+ memoff,
+ memsize,
+ obj);
+ if (plugin_obj != NULL)
{
// The input file was claimed by a plugin, and its symbols
// have been provided by the plugin.
- return obj;
+ // Delete its elf object.
+ if (obj != NULL)
+ delete obj;
+ return plugin_obj;
}
+
+ unclaimed = true;
}
- const unsigned char* ehdr;
- int read_size;
- if (!is_elf_object(input_file, memoff, &ehdr, &read_size))
+ if (!is_elf_obj)
{
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
+ if (unclaimed)
+ gold_error(_("%s: plugin failed to claim member %s at %zu"),
+ this->name().c_str(), member_name.c_str(),
+ static_cast<size_t>(off));
+ else
+ gold_error(_("%s: member %s at %zu is not an ELF object"),
+ this->name().c_str(), member_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());
this->members_[off] = member;
}
-Archive::Should_include
-Archive::should_include_member(Symbol_table* symtab, Layout* layout,
- const char* sym_name, Symbol** symp,
- std::string* why, char** tmpbufp,
- size_t* tmpbuflen)
-{
- // 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.
- char* tmpbuf = *tmpbufp;
- 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*>(xrealloc(tmpbuf, symlen + 1));
- *tmpbufp = tmpbuf;
- *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);
-
- *symp = sym;
-
- if (sym == NULL)
- {
- // Check whether the symbol was named in a -u option.
- if (parameters->options().is_undefined(sym_name))
- {
- *why = "-u ";
- *why += sym_name;
- }
- else if (layout->script_options()->is_referenced(sym_name))
- {
- size_t alc = 100 + strlen(sym_name);
- char* buf = new char[alc];
- snprintf(buf, alc, _("script or expression reference to %s"),
- sym_name);
- *why = buf;
- delete[] buf;
- }
- else
- return Archive::SHOULD_INCLUDE_UNKNOWN;
- }
- else if (!sym->is_undefined())
- return Archive::SHOULD_INCLUDE_NO;
- // PR 12001: Do not include an archive when the undefined
- // symbol has actually been defined on the command line.
- else if (layout->script_options()->is_pending_assignment(sym_name))
- return Archive::SHOULD_INCLUDE_NO;
- else if (sym->binding() == elfcpp::STB_WEAK)
- return Archive::SHOULD_INCLUDE_UNKNOWN;
-
- return Archive::SHOULD_INCLUDE_YES;
-}
-
// 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
Archive::include_all_members(Symbol_table* symtab, Layout* layout,
Input_objects* input_objects, Mapfile* mapfile)
{
+ // Don't include the same archive twice. This can happen if
+ // --whole-archive is nested inside --start-group (PR gold/12163).
+ if (this->included_all_members_)
+ return true;
+
+ this->included_all_members_ = true;
+
input_objects->archive_start(this);
if (this->members_.size() > 0)
return ret;
}
+// RAII class to ensure we unlock the object if it's a member of a
+// thin archive. We can't use Task_lock_obj in Archive::include_member
+// because the object file is already locked when it's opened by
+// get_elf_object_for_member.
+
+class Thin_archive_object_unlocker
+{
+ public:
+ Thin_archive_object_unlocker(const Task *task, Object* obj)
+ : task_(task), obj_(obj)
+ { }
+
+ ~Thin_archive_object_unlocker()
+ {
+ if (this->obj_->offset() == 0)
+ this->obj_->unlock(this->task_);
+ }
+
+ private:
+ Thin_archive_object_unlocker(const Thin_archive_object_unlocker&);
+ Thin_archive_object_unlocker& operator=(const Thin_archive_object_unlocker&);
+
+ const Task* task_;
+ Object* obj_;
+};
+
// Include an archive member in the link. OFF is the file offset of
// 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
return unconfigured ? false : true;
}
+ // If the object is an external member of a thin archive,
+ // unlock it when we're done here.
+ Thin_archive_object_unlocker unlocker(this->task_, obj);
+
if (mapfile != NULL)
mapfile->report_include_archive_member(obj->name(), sym, why);
if (!input_objects->add_object(obj))
{
- // If this is an external member of a thin archive, unlock the
- // file.
- if (obj->offset() == 0)
- obj->unlock(this->task_);
delete obj;
+ return true;
}
- else
- {
- {
- if (layout->incremental_inputs() != NULL)
- layout->incremental_inputs()->report_object(obj, this);
- Read_symbols_data sd;
- obj->read_symbols(&sd);
- obj->layout(symtab, layout, &sd);
- obj->add_symbols(symtab, &sd, layout);
- }
-
- // 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;
- }
+ if (layout->incremental_inputs() != NULL)
+ layout->incremental_inputs()->report_object(obj, 0, this, NULL);
+
+ {
+ Read_symbols_data sd;
+ obj->read_symbols(&sd);
+ obj->layout(symtab, layout, &sd);
+ obj->add_symbols(symtab, &sd, layout);
+ }
+ this->included_member_ = true;
return true;
}
+// Iterate over all unused symbols, and call the visitor class V for each.
+
+void
+Archive::do_for_all_unused_symbols(Symbol_visitor_base* v) const
+{
+ for (std::vector<Armap_entry>::const_iterator p = this->armap_.begin();
+ p != this->armap_.end();
+ ++p)
+ {
+ if (this->seen_offsets_.find(p->file_offset)
+ == this->seen_offsets_.end())
+ v->visit(this->armap_names_.data() + p->name_offset);
+ }
+}
+
// Print statistical information to stderr. This is used for --stats.
void
// For an incremental link, begin recording layout information.
Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
if (incremental_inputs != NULL)
- incremental_inputs->report_archive_begin(this->archive_);
+ {
+ unsigned int arg_serial = this->input_argument_->file().arg_serial();
+ Script_info* script_info = this->input_argument_->script_info();
+ incremental_inputs->report_archive_begin(this->archive_, arg_serial,
+ script_info);
+ }
bool added = this->archive_->add_symbols(this->symtab_, this->layout_,
this->input_objects_,
else
{
// For an incremental link, finish recording the layout information.
- Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
if (incremental_inputs != NULL)
incremental_inputs->report_archive_end(this->archive_);
unsigned int Lib_group::total_members_loaded;
Lib_group::Lib_group(const Input_file_lib* lib, Task* task)
- : lib_(lib), task_(task), members_()
+ : Library_base(task), members_()
{
this->members_.resize(lib->size());
}
+const std::string&
+Lib_group::do_filename() const
+{
+ std::string *filename = new std::string("/group/");
+ return *filename;
+}
+
// Select members from the lib group and add them to the link. We walk
// through the members, and check if each one up should be included.
// If the object says it should be included, we do so. We have to do
obj->lock(this->task_);
if (input_objects->add_object(obj))
{
- // FIXME: Record incremental link info for --start-lib/--end-lib.
if (layout->incremental_inputs() != NULL)
- layout->incremental_inputs()->report_object(obj, NULL);
+ layout->incremental_inputs()->report_object(obj, member.arg_serial_,
+ this, NULL);
obj->layout(symtab, layout, sd);
obj->add_symbols(symtab, sd, layout);
}
obj->unlock(this->task_);
}
+// Iterate over all unused symbols, and call the visitor class V for each.
+
+void
+Lib_group::do_for_all_unused_symbols(Symbol_visitor_base* v) const
+{
+ // Files are removed from the members list when used, so all the
+ // files remaining on the list are unused.
+ for (std::vector<Archive_member>::const_iterator p = this->members_.begin();
+ p != this->members_.end();
+ ++p)
+ {
+ Object* obj = p->obj_;
+ obj->for_all_global_symbols(p->sd_, v);
+ }
+}
+
// Print statistical information to stderr. This is used for --stats.
void
void
Add_lib_group_symbols::run(Workqueue*)
{
+ // For an incremental link, begin recording layout information.
+ Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_archive_begin(this->lib_, 0, NULL);
+
this->lib_->add_symbols(this->symtab_, this->layout_, this->input_objects_);
- // FIXME: Record incremental link info for --start_lib/--end_lib.
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_archive_end(this->lib_);
}
Add_lib_group_symbols::~Add_lib_group_symbols()