// target-select.cc -- select a target for an object file
-// Copyright 2006, 2007, 2008, 2009 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.
namespace gold
{
+// Class Set_target_once.
+
+void
+Set_target_once::do_run_once(void*)
+{
+ this->target_selector_->set_target();
+}
+
// Construct a Target_selector, which means adding it to the linked
// list. This runs at global constructor time, so we want it to be
// fast.
-Target_selector::Target_selector(int amachine, int size, bool is_big_end,
- const char* bfdname)
- : machine_(amachine), size_(size), is_big_endian_(is_big_end),
- bfd_name_(bfdname), instantiated_target_(NULL), lock_(NULL),
- initialize_lock_(&this->lock_)
-
+Target_selector::Target_selector(int machine, int size, bool is_big_endian,
+ const char* bfd_name)
+ : machine_(machine), size_(size), is_big_endian_(is_big_endian),
+ bfd_name_(bfd_name), instantiated_target_(NULL), set_target_once_(this)
{
this->next_ = target_selectors;
target_selectors = this;
}
-// Instantiate the target and return it. Use a lock to avoid
-// instantiating two instances of the same target.
+// Instantiate the target and return it. Use SET_TARGET_ONCE_ to
+// avoid instantiating two instances of the same target.
Target*
Target_selector::instantiate_target()
{
- // We assume that the pointer will either be written entirely or not
- // at all.
- if (this->instantiated_target_ == NULL)
- {
- this->initialize_lock_.initialize();
- Hold_optional_lock hl(this->lock_);
- if (this->instantiated_target_ == NULL)
- this->instantiated_target_ = this->do_instantiate_target();
- }
+ this->set_target_once_.run_once(NULL);
return this->instantiated_target_;
}
+// Instantiate the target. This is called at most once.
+
+void
+Target_selector::set_target()
+{
+ gold_assert(this->instantiated_target_ == NULL);
+ this->instantiated_target_ = this->do_instantiate_target();
+}
+
// Find the target for an ELF file.
Target*