Imported binutils-2.20

[msp430-binutils.git] / gold / target-select.cc

diff --git a/gold/target-select.cc b/gold/target-select.cc
new file mode 100644 (file)
index 0000000..dcd3017
--- /dev/null
+++ b/gold/target-select.cc
@@ -0,0 +1,124 @@
+// target-select.cc -- select a target for an object file
+
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#include "gold.h"
+
+#include <cstring>
+
+#include "elfcpp.h"
+#include "target-select.h"
+
+namespace
+{
+
+// The start of the list of target selectors.
+
+gold::Target_selector* target_selectors;
+
+} // End anonymous namespace.
+
+namespace gold
+{
+
+// 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 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), lock_(NULL),
+    initialize_lock_(&this->lock_)
+    
+{
+  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.
+
+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();
+    }
+  return this->instantiated_target_;
+}
+
+// Find the target for an ELF file.
+
+Target*
+select_target(int machine, int size, bool is_big_endian, int osabi,
+             int abiversion)
+{
+  for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+    {
+      int pmach = p->machine();
+      if ((pmach == machine || pmach == elfcpp::EM_NONE)
+         && p->get_size() == size
+         && (p->is_big_endian() ? is_big_endian : !is_big_endian))
+       {
+         Target* ret = p->recognize(machine, osabi, abiversion);
+         if (ret != NULL)
+           return ret;
+       }
+    }
+  return NULL;
+}
+
+// Find a target using a BFD name.  This is used to support the
+// --oformat option.
+
+Target*
+select_target_by_name(const char* name)
+{
+  for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+    {
+      const char* pname = p->bfd_name();
+      if (pname == NULL || strcmp(pname, name) == 0)
+       {
+         Target* ret = p->recognize_by_name(name);
+         if (ret != NULL)
+           return ret;
+       }
+    }
+  return NULL;
+}
+
+// Push all the supported BFD names onto a vector.
+
+void
+supported_target_names(std::vector<const char*>* names)
+{
+  for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+    p->supported_names(names);
+}
+
+} // End namespace gold.