// archive.cc -- archive support for gold
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "readsyms.h"
#include "symtab.h"
#include "object.h"
+#include "layout.h"
#include "archive.h"
#include "plugin.h"
+#include "incremental.h"
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)
+ {
+ // 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 if (strcmp(sym_name, parameters->entry()) == 0)
+ {
+ *why = "entry symbol ";
+ *why += sym_name;
+ }
+ else
+ return Library_base::SHOULD_INCLUDE_UNKNOWN;
+ }
+ else 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.
+ else if (layout->script_options()->is_pending_assignment(sym_name))
+ return Library_base::SHOULD_INCLUDE_NO;
+ else if (sym->binding() == elfcpp::STB_WEAK)
+ return Library_base::SHOULD_INCLUDE_UNKNOWN;
+
+ return Library_base::SHOULD_INCLUDE_YES;
+}
+
// The header of an entry in the archive. This is all readable text,
-// padded with spaces where necesary. If the contents of an archive
+// padded with spaces where necessary. If the contents of an archive
// are all text file, the entire archive is readable.
struct Archive::Archive_header
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)
+ : 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());
// The first member of the archive should be the symbol table.
std::string armap_name;
- section_size_type armap_size =
- convert_to_section_size_type(this->read_header(sarmag, false,
- &armap_name, NULL));
+ off_t header_size = this->read_header(sarmag, false, &armap_name, NULL);
+ if (header_size == -1)
+ return;
+
+ section_size_type armap_size = convert_to_section_size_type(header_size);
off_t off = sarmag;
if (armap_name.empty())
{
if ((off & 1) != 0)
++off;
std::string xname;
- section_size_type extended_size =
- convert_to_section_size_type(this->read_header(off, true, &xname, NULL));
+ header_size = this->read_header(off, true, &xname, NULL);
+ if (header_size == -1)
+ return;
+
+ section_size_type extended_size = convert_to_section_size_type(header_size);
if (xname == "/")
{
const unsigned char* p = this->get_view(off + sizeof(Archive_header),
}
// 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.
+// file offset OFF. Return the size of the member, or -1 if something
+// has gone wrong. Set *PNAME to the name of the member.
off_t
Archive::interpret_header(const Archive_header* hdr, off_t off,
{
gold_error(_("%s: malformed archive header at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
const int size_string_size = sizeof hdr->ar_size;
{
gold_error(_("%s: malformed archive header size at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
if (hdr->ar_name[0] != '/')
{
gold_error(_("%s: malformed archive header name at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
pname->assign(hdr->ar_name, name_end - hdr->ar_name);
if (nested_off != NULL)
else if (hdr->ar_name[1] == ' ')
{
// This is the symbol table.
- pname->clear();
+ if (!pname->empty())
+ pname->clear();
}
else if (hdr->ar_name[1] == '/')
{
{
gold_error(_("%s: bad extended name index at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
const char* name = this->extended_names_.data() + x;
{
gold_error(_("%s: bad extended name entry at header %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
pname->assign(name, name_end - 1 - name);
if (nested_off != NULL)
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);
+ off_t size = this->archive_->interpret_header(hdr, this->off_,
+ &this->header_.name,
+ &this->header_.nested_off);
+ if (size == -1)
+ {
+ this->header_.off = filesize;
+ return;
+ }
+
+ this->header_.size = size;
this->header_.off = this->off_;
// Skip special members.
off_t nested_off;
*memsize = this->read_header(off, false, member_name, &nested_off);
+ if (*memsize == -1)
+ return false;
*input_file = this->input_file_;
*memoff = off + static_cast<off_t>(sizeof(Archive_header));
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.
+// Return an ELF object for the member at offset OFF. If
+// PUNCONFIGURED is not NULL, then 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;
+ if (punconfigured != NULL)
+ *punconfigured = false;
Input_file* input_file;
off_t memoff;
{
Object* obj = parameters->options().plugins()->claim_file(input_file,
memoff,
- memsize);
+ memsize,
+ NULL);
if (obj != NULL)
{
// The input file was claimed by a plugin, and its symbols
return NULL;
}
- Object *obj = make_elf_object((std::string(this->input_file_->filename())
+ Object* obj = make_elf_object((std::string(this->input_file_->filename())
+ "(" + member_name + ")"),
input_file, memoff, ehdr, read_size,
punconfigured);
void
Archive::read_symbols(off_t off)
{
- bool dummy;
- Object* obj = this->get_elf_object_for_member(off, &dummy);
-
+ Object* obj = this->get_elf_object_for_member(off, NULL);
if (obj == NULL)
return;
const char* sym_name = (this->armap_names_.data()
+ this->armap_[i].name_offset);
- // 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;
+ Symbol* sym;
+ std::string why;
+ Archive::Should_include t =
+ Archive::should_include_member(symtab, layout, sym_name, &sym,
+ &why, &tmpbuf, &tmpbuflen);
- ++ver;
- if (*ver == '@')
- {
- ++ver;
- def = true;
- }
- }
+ if (t == Archive::SHOULD_INCLUDE_NO
+ || t == Archive::SHOULD_INCLUDE_YES)
+ this->armap_checked_[i] = 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)
- {
- // 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)
+ if (t != Archive::SHOULD_INCLUDE_YES)
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;
- }
if (!this->include_member(symtab, layout, input_objects,
last_seen_offset, mapfile, sym,
why.c_str()))
return true;
}
+// Return whether the archive includes a member which defines the
+// symbol SYM.
+
+bool
+Archive::defines_symbol(Symbol* sym) const
+{
+ const char* symname = sym->name();
+ size_t symname_len = strlen(symname);
+ size_t armap_size = this->armap_.size();
+ for (size_t i = 0; i < armap_size; ++i)
+ {
+ if (this->armap_checked_[i])
+ continue;
+ const char* archive_symname = (this->armap_names_.data()
+ + this->armap_[i].name_offset);
+ if (strncmp(archive_symname, symname, symname_len) != 0)
+ continue;
+ char c = archive_symname[symname_len];
+ if (c == '\0' && sym->version() == NULL)
+ return true;
+ if (c == '@')
+ {
+ const char* ver = archive_symname + symname_len + 1;
+ if (*ver == '@')
+ {
+ if (sym->version() == NULL)
+ return true;
+ ++ver;
+ }
+ if (sym->version() != NULL && strcmp(sym->version(), ver) == 0)
+ return true;
+ }
+ }
+ return false;
+}
+
// Include all the archive members in the link. This is for --whole-archive.
bool
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)
std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
if (p != this->members_.end())
{
- Object *obj = p->second.obj_;
+ Object* obj = p->second.obj_;
- Read_symbols_data *sd = p->second.sd_;
+ 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 true;
}
- bool unconfigured;
- Object* obj = this->get_elf_object_for_member(off, &unconfigured);
+ // If this is the first object we are including from this archive,
+ // and we searched for this archive, most likely because it was
+ // found via a -l option, then if the target is incompatible we want
+ // to move on to the next archive found in the search path.
+ bool unconfigured = false;
+ bool* punconfigured = NULL;
+ if (!this->included_member_ && this->searched_for())
+ punconfigured = &unconfigured;
- if (!this->included_member_
- && this->searched_for()
- && obj == NULL
- && unconfigured)
+ Object* obj = this->get_elf_object_for_member(off, punconfigured);
+ if (obj == NULL)
{
- if (obj != NULL)
- delete obj;
- return false;
+ // Return false to search for another archive, true if we found
+ // an error.
+ return unconfigured ? false : true;
}
- if (obj == NULL)
- return true;
-
if (mapfile != NULL)
mapfile->report_include_archive_member(obj->name(), sym, why);
}
if (!input_objects->add_object(obj))
- delete obj;
+ {
+ // If this is an external member of a thin archive, unlock the
+ // file.
+ if (obj->offset() == 0)
+ obj->unlock(this->task_);
+ delete obj;
+ }
else
{
- Read_symbols_data sd;
- obj->read_symbols(&sd);
- obj->layout(symtab, layout, &sd);
- obj->add_symbols(symtab, &sd, layout);
+ {
+ 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);
+ }
// If this is an external member of a thin archive, unlock the file
// for the next task.
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
void
Add_archive_symbols::run(Workqueue* workqueue)
{
+ // For an incremental link, begin recording layout information.
+ Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs();
+ if (incremental_inputs != NULL)
+ {
+ 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_,
this->mapfile_);
this->input_group_->add_archive(this->archive_);
else
{
- // We no longer need to know about this archive.
- delete this->archive_;
+ // For an incremental link, finish recording the layout information.
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_archive_end(this->archive_);
+
+ if (!parameters->options().has_plugins()
+ || this->archive_->input_file()->options().whole_archive())
+ {
+ // We no longer need to know about this archive.
+ delete this->archive_;
+ }
+ else
+ {
+ // The plugin interface may want to rescan this archive.
+ parameters->options().plugins()->save_archive(this->archive_);
+ }
+
this->archive_ = NULL;
}
}
+// Class Lib_group static variables.
+unsigned int Lib_group::total_lib_groups;
+unsigned int Lib_group::total_members;
+unsigned int Lib_group::total_members_loaded;
+
+Lib_group::Lib_group(const Input_file_lib* lib, Task* task)
+ : Library_base(task), lib_(lib), 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
+// this in a loop, since including one member may create new undefined
+// symbols which may be satisfied by other members.
+
+void
+Lib_group::add_symbols(Symbol_table* symtab, Layout* layout,
+ Input_objects* input_objects)
+{
+ ++Lib_group::total_lib_groups;
+
+ Lib_group::total_members += this->members_.size();
+
+ bool added_new_object;
+ do
+ {
+ added_new_object = false;
+ unsigned int i = 0;
+ while (i < this->members_.size())
+ {
+ const Archive_member& member = this->members_[i];
+ Object* obj = member.obj_;
+ std::string why;
+
+ // Skip files with no symbols. Plugin objects have
+ // member.sd_ == NULL.
+ if (obj != NULL
+ && (member.sd_ == NULL || member.sd_->symbol_names != NULL))
+ {
+ Archive::Should_include t = obj->should_include_member(symtab,
+ layout,
+ member.sd_,
+ &why);
+
+ if (t != Archive::SHOULD_INCLUDE_YES)
+ {
+ ++i;
+ continue;
+ }
+
+ this->include_member(symtab, layout, input_objects, member);
+
+ added_new_object = true;
+ }
+ else
+ {
+ if (member.sd_ != NULL)
+ {
+ // The file must be locked in order to destroy the views
+ // associated with it.
+ gold_assert(obj != NULL);
+ obj->lock(this->task_);
+ delete member.sd_;
+ obj->unlock(this->task_);
+ }
+ }
+
+ this->members_[i] = this->members_.back();
+ this->members_.pop_back();
+ }
+ }
+ while (added_new_object);
+}
+
+// Include a lib group member in the link.
+
+void
+Lib_group::include_member(Symbol_table* symtab, Layout* layout,
+ Input_objects* input_objects,
+ const Archive_member& member)
+{
+ ++Lib_group::total_members_loaded;
+
+ Object* obj = member.obj_;
+ gold_assert(obj != NULL);
+
+ Pluginobj* pluginobj = obj->pluginobj();
+ if (pluginobj != NULL)
+ {
+ pluginobj->add_symbols(symtab, NULL, layout);
+ return;
+ }
+
+ Read_symbols_data* sd = member.sd_;
+ gold_assert(sd != NULL);
+ obj->lock(this->task_);
+ if (input_objects->add_object(obj))
+ {
+ if (layout->incremental_inputs() != NULL)
+ layout->incremental_inputs()->report_object(obj, member.arg_serial_,
+ this, NULL);
+ obj->layout(symtab, layout, sd);
+ obj->add_symbols(symtab, sd, layout);
+ }
+ delete sd;
+ // Unlock the file for the next task.
+ 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
+Lib_group::print_stats()
+{
+ fprintf(stderr, _("%s: lib groups: %u\n"),
+ program_name, Lib_group::total_lib_groups);
+ fprintf(stderr, _("%s: total lib groups members: %u\n"),
+ program_name, Lib_group::total_members);
+ fprintf(stderr, _("%s: loaded lib groups members: %u\n"),
+ program_name, Lib_group::total_members_loaded);
+}
+
+Task_token*
+Add_lib_group_symbols::is_runnable()
+{
+ if (this->readsyms_blocker_ != NULL && this->readsyms_blocker_->is_blocked())
+ return this->readsyms_blocker_;
+ if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
+ return this->this_blocker_;
+ return NULL;
+}
+
+void
+Add_lib_group_symbols::locks(Task_locker* tl)
+{
+ tl->add(this, this->next_blocker_);
+}
+
+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_);
+
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_archive_end(this->lib_);
+}
+
+Add_lib_group_symbols::~Add_lib_group_symbols()
+{
+ if (this->this_blocker_ != NULL)
+ delete this->this_blocker_;
+ // next_blocker_ is deleted by the task associated with the next
+ // input file.
+}
+
} // End namespace gold.
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