* gold-threads.h (class Once): Define.

	(class Initialize_lock): Rewrite as child of Once.
	* gold-threads.cc (class Once_initialize): Define.
	(once_pointer_control): New static variable.
	(once_pointer, once_arg): New static variables.
	(c_run_once): New static function.
	(Once::Once, Once::run_once, Once::internal_run): New functions.
	(class Initialize_lock_once): Remove.
	(initialize_lock_control): Remove.
	(initialize_lock_pointer): Remove.
	(initialize_lock_once): Remove.
	(Initialize_lock::Initialize_lock): Move to gold-threads.h.
	(Initialize_lock::initialize): Rewrite.
	(Initialize_lock::do_run_once): New function.
	* archive.cc (Archive::interpret_header): Only clear name if it is
	not already empty.
	* fileread.cc: Include "gold-threads.h"
	(file_counts_lock): New static variable.
	(file_counts_initialize_lock): Likewise.
	(File_read::release): Only increment counts when using --stats.
	Use a lock around the increment.
	* parameters.cc (class Set_parameters_target_once): Define.
	(set_parameters_target_once): New static variable.
	(Parameters::Parameters): Move here from parameters.h.
	(Parameters::set_target): Rewrite.
	(Parameters::set_target_once): New function.
	(Parameters::clear_target): Move here and rewrite.
	* parameters.h (class Parameters): Update declarations.  Add
	set_parameters_target_once_ field.
	(Parameters::Parameters): Move to parameters.cc.
	(Parameters::clear_target): Likewise.
	* readsyms.cc (Read_symbols::do_group): Create a Start_group
	task.
	(Start_group::~Start_group): New function.
	(Start_group::is_runnable): New function.
	(Start_group::locks, Start_group::run): New functions.
	(Finish_group::run): Change saw_undefined to size_t.
	* readsyms.h (class Start_group): Define.
	(class Finish_group): Change saw_undefined_ field to size_t.
	(Finish_group::Finish_group): Remove saw_undefined and
	this_blocker parameters.  Change all callers.
	(Finish_group::set_saw_undefined): New function.
	(Finish_group::set_blocker): New function.
	* symtab.h (class Symbol_table): Change saw_undefined to return
	size_t.  Change saw_undefined_ field to size_t.
	* target-select.cc (Set_target_once::do_run_once): New function.
	(Target_selector::Target_selector): Initialize set_target_once_
	field.  Don't initialize lock_ and initialize_lock_ fields.
	(Target_selector::instantiate_target): Rewrite.
	(Target_selector::set_target): New function.
	* target-select.h (class Set_target_once): Define.
	(class Target_selector): Update declarations.  Make
	Set_target_once a friend.  Remove lock_ and initialize_lock_
	fields.  Add set_target_once_ field.

1 files changed, 64 insertions, 14 deletions

diff --git a/gold/parameters.cc b/gold/parameters.cc
index 9cf7808..1d0f082 100644
--- a/gold/parameters.cc
+++ b/gold/parameters.cc
@@ -1,6 +1,6 @@
 // parameters.cc -- general parameters for a link using gold
 
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -30,6 +30,47 @@
 namespace gold
 {
 
+// Our local version of the variable, which is not const.
+
+static Parameters static_parameters;
+
+// The global variable.
+
+const Parameters* parameters = &static_parameters;
+
+// A helper class to set the target once.
+
+class Set_parameters_target_once : public Once
+{
+ public:
+  Set_parameters_target_once(Parameters* parameters)
+    : parameters_(parameters)
+  { }
+
+ protected:
+  void
+  do_run_once(void* arg)
+  { this->parameters_->set_target_once(static_cast<Target*>(arg)); }
+
+ private:
+  Parameters* parameters_;
+};
+
+// We only need one Set_parameters_target_once.
+
+static
+Set_parameters_target_once set_parameters_target_once(&static_parameters);
+
+// Class Parameters.
+
+Parameters::Parameters()
+   : errors_(NULL), options_(NULL), target_(NULL),
+     doing_static_link_valid_(false), doing_static_link_(false),
+     debug_(0),
+     set_parameters_target_once_(&set_parameters_target_once)
+ {
+ }
+
 void
 Parameters::set_errors(Errors* errors)
 {
@@ -61,10 +102,28 @@ Parameters::set_doing_static_link(bool doing_static_link)
 void
 Parameters::set_target(Target* target)
 {
-  if (!this->target_valid())
-    this->target_ = target;
-  else
-    gold_assert(target == this->target_);
+  this->set_parameters_target_once_->run_once(static_cast<void*>(target));
+  gold_assert(target == this->target_);
+}
+
+// This is called at most once.
+
+void
+Parameters::set_target_once(Target* target)
+{
+  gold_assert(this->target_ == NULL);
+  this->target_ = target;
+}
+
+// Clear the target, for testing.
+
+void
+Parameters::clear_target()
+{
+  this->target_ = NULL;
+  // We need a new Set_parameters_target_once so that we can set the
+  // target again.
+  this->set_parameters_target_once_ = new Set_parameters_target_once(this);
 }
 
 // Return whether TARGET is compatible with the target we are using.
@@ -122,15 +181,6 @@ Parameters::size_and_endianness() const
     gold_unreachable();
 }
 
-
-// Our local version of the variable, which is not const.
-
-static Parameters static_parameters;
-
-// The global variable.
-
-const Parameters* parameters = &static_parameters;
-
 void
 set_parameters_errors(Errors* errors)
 { static_parameters.set_errors(errors); }