// plugin.cc -- plugin manager for gold -*- C++ -*-
-// Copyright 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// Written by Cary Coutant <ccoutant@google.com>.
// This file is part of gold.
static enum ld_plugin_status
get_input_file(const void *handle, struct ld_plugin_input_file *file);
+static enum ld_plugin_status
+get_view(const void *handle, const void **viewp);
+
static enum ld_plugin_status
release_input_file(const void *handle);
get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
static enum ld_plugin_status
-add_input_file(char *pathname);
+add_input_file(const char *pathname);
static enum ld_plugin_status
-add_input_library(char *pathname);
+add_input_library(const char *pathname);
+
+static enum ld_plugin_status
+set_extra_library_path(const char *path);
static enum ld_plugin_status
message(int level, const char *format, ...);
this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
if (this->handle_ == NULL)
{
- gold_error(_("%s: could not load plugin library"),
- this->filename_.c_str());
+ gold_error(_("%s: could not load plugin library: %s"),
+ this->filename_.c_str(), dlerror());
return;
}
sscanf(ver, "%d.%d", &major, &minor);
// Allocate and populate a transfer vector.
- const int tv_fixed_size = 14;
+ const int tv_fixed_size = 17;
int tv_size = this->args_.size() + tv_fixed_size;
- ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
+ ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
// Put LDPT_MESSAGE at the front of the list so the plugin can use it
// while processing subsequent entries.
else
tv[i].tv_u.tv_val = LDPO_EXEC;
+ ++i;
+ tv[i].tv_tag = LDPT_OUTPUT_NAME;
+ tv[i].tv_u.tv_string = parameters->options().output();
+
for (unsigned int j = 0; j < this->args_.size(); ++j)
{
++i;
tv[i].tv_tag = LDPT_GET_INPUT_FILE;
tv[i].tv_u.tv_get_input_file = get_input_file;
+ ++i;
+ tv[i].tv_tag = LDPT_GET_VIEW;
+ tv[i].tv_u.tv_get_view = get_view;
+
++i;
tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
tv[i].tv_u.tv_release_input_file = release_input_file;
tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
tv[i].tv_u.tv_add_input_library = add_input_library;
+ ++i;
+ tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
+ tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
+
++i;
tv[i].tv_tag = LDPT_NULL;
tv[i].tv_u.tv_val = 0;
// Call the plugin claim-file handler.
inline bool
-Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
+Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file)
{
int claimed = 0;
}
}
+// This task is used to rescan archives as needed.
+
+class Plugin_rescan : public Task
+{
+ public:
+ Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker)
+ : this_blocker_(this_blocker), next_blocker_(next_blocker)
+ { }
+
+ ~Plugin_rescan()
+ {
+ delete this->this_blocker_;
+ }
+
+ Task_token*
+ is_runnable()
+ {
+ if (this->this_blocker_->is_blocked())
+ return this->this_blocker_;
+ return NULL;
+ }
+
+ void
+ locks(Task_locker* tl)
+ { tl->add(this, this->next_blocker_); }
+
+ void
+ run(Workqueue*)
+ { parameters->options().plugins()->rescan(this); }
+
+ std::string
+ get_name() const
+ { return "Plugin_rescan"; }
+
+ private:
+ Task_token* this_blocker_;
+ Task_token* next_blocker_;
+};
+
// Plugin_manager methods.
Plugin_manager::~Plugin_manager()
{
if ((*this->current_)->claim_file(&this->plugin_input_file_))
{
+ this->any_claimed_ = true;
+
if (this->objects_.size() > handle)
return this->objects_[handle];
return NULL;
}
+// Save an archive. This is used so that a plugin can add a file
+// which refers to a symbol which was not previously referenced. In
+// that case we want to pretend that the symbol was referenced before,
+// and pull in the archive object.
+
+void
+Plugin_manager::save_archive(Archive* archive)
+{
+ if (this->in_replacement_phase_ || !this->any_claimed_)
+ delete archive;
+ else
+ this->rescannable_.push_back(Rescannable(archive));
+}
+
+// Save an Input_group. This is like save_archive.
+
+void
+Plugin_manager::save_input_group(Input_group* input_group)
+{
+ if (this->in_replacement_phase_ || !this->any_claimed_)
+ delete input_group;
+ else
+ this->rescannable_.push_back(Rescannable(input_group));
+}
+
// Call the all-symbols-read handlers.
void
++this->current_)
(*this->current_)->all_symbols_read();
+ if (this->any_added_)
+ {
+ Task_token* next_blocker = new Task_token(true);
+ next_blocker->add_blocker();
+ workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker));
+ this->this_blocker_ = next_blocker;
+ }
+
*last_blocker = this->this_blocker_;
}
+// This is called when we see a new undefined symbol. If we are in
+// the replacement phase, this means that we may need to rescan some
+// archives we have previously seen.
+
+void
+Plugin_manager::new_undefined_symbol(Symbol* sym)
+{
+ if (this->in_replacement_phase_)
+ this->undefined_symbols_.push_back(sym);
+}
+
+// Rescan archives as needed. This handles the case where a new
+// object file added by a plugin has an undefined reference to some
+// symbol defined in an archive.
+
+void
+Plugin_manager::rescan(Task* task)
+{
+ size_t rescan_pos = 0;
+ size_t rescan_size = this->rescannable_.size();
+ while (!this->undefined_symbols_.empty())
+ {
+ if (rescan_pos >= rescan_size)
+ {
+ this->undefined_symbols_.clear();
+ return;
+ }
+
+ Undefined_symbol_list undefs;
+ undefs.reserve(this->undefined_symbols_.size());
+ this->undefined_symbols_.swap(undefs);
+
+ size_t min_rescan_pos = rescan_size;
+
+ for (Undefined_symbol_list::const_iterator p = undefs.begin();
+ p != undefs.end();
+ ++p)
+ {
+ if (!(*p)->is_undefined())
+ continue;
+
+ this->undefined_symbols_.push_back(*p);
+
+ // Find the first rescan archive which defines this symbol,
+ // starting at the current rescan position. The rescan position
+ // exists so that given -la -lb -lc we don't look for undefined
+ // symbols in -lb back in -la, but instead get the definition
+ // from -lc. Don't bother to look past the current minimum
+ // rescan position.
+ for (size_t i = rescan_pos; i < min_rescan_pos; ++i)
+ {
+ if (this->rescannable_defines(i, *p))
+ {
+ min_rescan_pos = i;
+ break;
+ }
+ }
+ }
+
+ if (min_rescan_pos >= rescan_size)
+ {
+ // We didn't find any rescannable archives which define any
+ // undefined symbols.
+ return;
+ }
+
+ const Rescannable& r(this->rescannable_[min_rescan_pos]);
+ if (r.is_archive)
+ {
+ Task_lock_obj<Archive> tl(task, r.u.archive);
+ r.u.archive->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_, this->mapfile_);
+ }
+ else
+ {
+ size_t next_saw_undefined = this->symtab_->saw_undefined();
+ size_t saw_undefined;
+ do
+ {
+ saw_undefined = next_saw_undefined;
+
+ for (Input_group::const_iterator p = r.u.input_group->begin();
+ p != r.u.input_group->end();
+ ++p)
+ {
+ Task_lock_obj<Archive> tl(task, *p);
+
+ (*p)->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_, this->mapfile_);
+ }
+
+ next_saw_undefined = this->symtab_->saw_undefined();
+ }
+ while (saw_undefined != next_saw_undefined);
+ }
+
+ for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i)
+ {
+ if (this->rescannable_[i].is_archive)
+ delete this->rescannable_[i].u.archive;
+ else
+ delete this->rescannable_[i].u.input_group;
+ }
+
+ rescan_pos = min_rescan_pos + 1;
+ }
+}
+
+// Return whether the rescannable at index I defines SYM.
+
+bool
+Plugin_manager::rescannable_defines(size_t i, Symbol* sym)
+{
+ const Rescannable& r(this->rescannable_[i]);
+ if (r.is_archive)
+ return r.u.archive->defines_symbol(sym);
+ else
+ {
+ for (Input_group::const_iterator p = r.u.input_group->begin();
+ p != r.u.input_group->end();
+ ++p)
+ {
+ if ((*p)->defines_symbol(sym))
+ return true;
+ }
+ return false;
+ }
+}
+
// Layout deferred objects.
void
for (obj = this->deferred_layout_objects_.begin();
obj != this->deferred_layout_objects_.end();
++obj)
- (*obj)->layout_deferred_sections(this->layout_);
+ {
+ // Lock the object so we can read from it. This is only called
+ // single-threaded from queue_middle_tasks, so it is OK to lock.
+ // Unfortunately we have no way to pass in a Task token.
+ const Task* dummy_task = reinterpret_cast<const Task*>(-1);
+ Task_lock_obj<Object> tl(dummy_task, *obj);
+ (*obj)->layout_deferred_sections(this->layout_);
+ }
}
// Call the cleanup handlers.
ld_plugin_status
Plugin_manager::get_input_file(unsigned int handle,
- struct ld_plugin_input_file *file)
+ struct ld_plugin_input_file* file)
{
Pluginobj* obj = this->object(handle);
if (obj == NULL)
return LDPS_OK;
}
+ld_plugin_status
+Plugin_manager::get_view(unsigned int handle, const void **viewp)
+{
+ off_t offset;
+ size_t filesize;
+ Input_file *input_file;
+ if (this->objects_.size() == handle)
+ {
+ // We are being called from the claim_file hook.
+ const struct ld_plugin_input_file &f = this->plugin_input_file_;
+ offset = f.offset;
+ filesize = f.filesize;
+ input_file = this->input_file_;
+ }
+ else
+ {
+ // An already claimed file.
+ Pluginobj* obj = this->object(handle);
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+ offset = obj->offset();
+ filesize = obj->filesize();
+ input_file = obj->input_file();
+ }
+ *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false,
+ false);
+ return LDPS_OK;
+}
+
+// Add a new library path.
+
+ld_plugin_status
+Plugin_manager::set_extra_library_path(const char* path)
+{
+ this->extra_search_path_ = std::string(path);
+ return LDPS_OK;
+}
+
// Add a new input file.
ld_plugin_status
-Plugin_manager::add_input_file(char *pathname, bool is_lib)
+Plugin_manager::add_input_file(const char* pathname, bool is_lib)
{
Input_file_argument file(pathname,
(is_lib
? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
: Input_file_argument::INPUT_FILE_TYPE_FILE),
- "", false, this->options_);
+ (is_lib
+ ? this->extra_search_path_.c_str()
+ : ""),
+ false,
+ this->options_);
Input_argument* input_argument = new Input_argument(file);
Task_token* next_blocker = new Task_token(true);
next_blocker->add_blocker();
- if (this->layout_->incremental_inputs())
+ if (parameters->incremental())
gold_error(_("input files added by plug-ins in --incremental mode not "
"supported yet"));
this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
this->mapfile_,
input_argument,
NULL,
+ NULL,
this->this_blocker_,
next_blocker));
this->this_blocker_ = next_blocker;
+ this->any_added_ = true;
return LDPS_OK;
}
return true;
if (parameters->options().relocatable())
return true;
+ if (parameters->options().is_undefined(lsym->name()))
+ return true;
if (parameters->options().export_dynamic() || parameters->options().shared())
return lsym->is_externally_visible();
return false;
{
if (nsyms > this->nsyms_)
return LDPS_NO_SYMS;
+
+ if (static_cast<size_t>(nsyms) > this->symbols_.size())
+ {
+ // We never decided to include this object. We mark all symbols as
+ // preempted.
+ gold_assert(this->symbols_.size() == 0);
+ for (int i = 0; i < nsyms; i++)
+ syms[i].resolution = LDPR_PREEMPTED_REG;
+ return LDPS_OK;
+ }
+
for (int i = 0; i < nsyms; i++)
{
ld_plugin_symbol* isym = &syms[i];
// The original symbol was undefined or common.
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_RESOLVED_EXEC;
+ else if (lsym->object()->pluginobj() == this)
+ res = (is_visible_from_outside(lsym)
+ ? LDPR_PREVAILING_DEF
+ : LDPR_PREVAILING_DEF_IRONLY);
else if (lsym->object()->pluginobj() != NULL)
res = LDPR_RESOLVED_IR;
else if (lsym->object()->is_dynamic())
for (int i = 0; i < this->nsyms_; ++i)
{
- const struct ld_plugin_symbol *isym = &this->syms_[i];
+ const struct ld_plugin_symbol* isym = &this->syms_[i];
const char* name = isym->name;
const char* ver = isym->version;
elfcpp::Elf_Half shndx;
switch (isym->visibility)
{
case LDPV_PROTECTED:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_PROTECTED;
break;
case LDPV_INTERNAL:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_INTERNAL;
break;
case LDPV_HIDDEN:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_HIDDEN;
break;
case LDPV_DEFAULT:
default:
}
}
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_pluginobj<size, big_endian>::do_should_include_member(
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data*,
+ std::string* why)
+{
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
+
+ for (int i = 0; i < this->nsyms_; ++i)
+ {
+ const struct ld_plugin_symbol& sym = this->syms_[i];
+ const char* name = sym.name;
+ Symbol* symbol;
+ Archive::Should_include t = Archive::should_include_member(symtab,
+ layout,
+ name,
+ &symbol, why,
+ &tmpbuf,
+ &tmpbuflen);
+ if (t == Archive::SHOULD_INCLUDE_YES)
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return t;
+ }
+ }
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return Archive::SHOULD_INCLUDE_UNKNOWN;
+}
+
+// Iterate over global symbols, calling a visitor class V for each.
+
+template<int size, bool big_endian>
+void
+Sized_pluginobj<size, big_endian>::do_for_all_global_symbols(
+ Read_symbols_data*,
+ Library_base::Symbol_visitor_base* v)
+{
+ for (int i = 0; i < this->nsyms_; ++i)
+ {
+ const struct ld_plugin_symbol& sym = this->syms_[i];
+ if (sym.def != LDPK_UNDEF)
+ v->visit(sym.name);
+ }
+}
+
+// Iterate over local symbols, calling a visitor class V for each GOT offset
+// associated with a local symbol.
+template<int size, bool big_endian>
+void
+Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries(
+ Got_offset_list::Visitor*) const
+{
+ gold_unreachable();
+}
+
// Get the size of a section. Not used for plugin objects.
template<int size, bool big_endian>
}
// Class Plugin_finish. This task runs after all replacement files have
-// been added. It calls each plugin's cleanup handler.
+// been added. For now, it's a placeholder for a possible plugin API
+// to allow the plugin to release most of its resources. The cleanup
+// handlers must be called later, because they can remove the temporary
+// object files that are needed until the end of the link.
class Plugin_finish : public Task
{
void
run(Workqueue*)
{
- Plugin_manager* plugins = parameters->options().plugins();
- gold_assert(plugins != NULL);
- plugins->cleanup();
+ // We could call early cleanup handlers here.
}
std::string
Plugin_hook::run(Workqueue* workqueue)
{
gold_assert(this->options_.has_plugins());
+ Symbol* start_sym;
+ if (parameters->options().entry())
+ start_sym = this->symtab_->lookup(parameters->options().entry());
+ else
+ start_sym = this->symtab_->lookup("_start");
+ if (start_sym != NULL)
+ start_sym->set_in_real_elf();
+
this->options_.plugins()->all_symbols_read(workqueue,
this,
this->input_objects_,
// Add symbols from a plugin-claimed input file.
static enum ld_plugin_status
-add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
+add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms)
{
gold_assert(parameters->options().has_plugins());
Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
// file descriptor.
static enum ld_plugin_status
-get_input_file(const void *handle, struct ld_plugin_input_file *file)
+get_input_file(const void* handle, struct ld_plugin_input_file* file)
{
gold_assert(parameters->options().has_plugins());
unsigned int obj_index =
// Release the input file.
static enum ld_plugin_status
-release_input_file(const void *handle)
+release_input_file(const void* handle)
{
gold_assert(parameters->options().has_plugins());
unsigned int obj_index =
return parameters->options().plugins()->release_input_file(obj_index);
}
+static enum ld_plugin_status
+get_view(const void *handle, const void **viewp)
+{
+ gold_assert(parameters->options().has_plugins());
+ unsigned int obj_index =
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
+ return parameters->options().plugins()->get_view(obj_index, viewp);
+}
+
// Get the symbol resolution info for a plugin-claimed input file.
static enum ld_plugin_status
-get_symbols(const void * handle, int nsyms, ld_plugin_symbol* syms)
+get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms)
{
gold_assert(parameters->options().has_plugins());
Pluginobj* obj = parameters->options().plugins()->object(
// Add a new (real) input file generated by a plugin.
static enum ld_plugin_status
-add_input_file(char *pathname)
+add_input_file(const char* pathname)
{
gold_assert(parameters->options().has_plugins());
return parameters->options().plugins()->add_input_file(pathname, false);
// Add a new (real) library required by a plugin.
static enum ld_plugin_status
-add_input_library(char *pathname)
+add_input_library(const char* pathname)
{
gold_assert(parameters->options().has_plugins());
return parameters->options().plugins()->add_input_file(pathname, true);
}
+// Set the extra library path to be used by libraries added via
+// add_input_library
+
+static enum ld_plugin_status
+set_extra_library_path(const char* path)
+{
+ gold_assert(parameters->options().has_plugins());
+ return parameters->options().plugins()->set_extra_library_path(path);
+}
+
// Issue a diagnostic message from a plugin.
static enum ld_plugin_status
-message(int level, const char * format, ...)
+message(int level, const char* format, ...)
{
va_list args;
va_start(args, format);
projects / deliverable / binutils-gdb.git / blobdiff