Subversion Repositories openrisc

/* 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;

}