Initial check-in of gcc 4.7.2.

Change-Id: I4a2f5a921c21741a0e18bda986d77e5f1bef0365

1 files changed, 77 insertions, 0 deletions

diff --git a/gcc-4.7/libgo/runtime/go-defer.c b/gcc-4.7/libgo/runtime/go-defer.c
new file mode 100644
index 000000000..c27de6ab4
--- /dev/null
+++ b/gcc-4.7/libgo/runtime/go-defer.c
@@ -0,0 +1,77 @@
+/* go-defer.c -- manage the defer stack.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include <stddef.h>
+
+#include "runtime.h"
+#include "go-alloc.h"
+#include "go-panic.h"
+#include "go-defer.h"
+
+/* This function is called each time we need to defer a call.  */
+
+void
+__go_defer (_Bool *frame, void (*pfn) (void *), void *arg)
+{
+  G *g;
+  struct __go_defer_stack *n;
+
+  g = runtime_g ();
+  n = (struct __go_defer_stack *) __go_alloc (sizeof (struct __go_defer_stack));
+  n->__next = g->defer;
+  n->__frame = frame;
+  n->__panic = g->panic;
+  n->__pfn = pfn;
+  n->__arg = arg;
+  n->__retaddr = NULL;
+  g->defer = n;
+}
+
+/* This function is called when we want to undefer the stack.  */
+
+void
+__go_undefer (_Bool *frame)
+{
+  G *g;
+
+  g = runtime_g ();
+  while (g->defer != NULL && g->defer->__frame == frame)
+    {
+      struct __go_defer_stack *d;
+      void (*pfn) (void *);
+
+      d = g->defer;
+      pfn = d->__pfn;
+      d->__pfn = NULL;
+
+      if (pfn != NULL)
+	(*pfn) (d->__arg);
+
+      g->defer = d->__next;
+      __go_free (d);
+
+      /* Since we are executing a defer function here, we know we are
+	 returning from the calling function.  If the calling
+	 function, or one of its callees, paniced, then the defer
+	 functions would be executed by __go_panic.  */
+      *frame = 1;
+    }
+}
+
+/* This function is called to record the address to which the deferred
+   function returns.  This may in turn be checked by __go_can_recover.
+   The frontend relies on this function returning false.  */
+
+_Bool
+__go_set_defer_retaddr (void *retaddr)
+{
+  G *g;
+
+  g = runtime_g ();
+  if (g->defer != NULL)
+    g->defer->__retaddr = retaddr;
+  return 0;
+}