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/* 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 "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 (void *frame, void (*pfn) (void *), void *arg)
{
struct __go_defer_stack *n;
if (__go_panic_defer == NULL)
__go_panic_defer = ((struct __go_panic_defer_struct *)
__go_alloc (sizeof (struct __go_panic_defer_struct)));
n = (struct __go_defer_stack *) __go_alloc (sizeof (struct __go_defer_stack));
n->__next = __go_panic_defer->__defer;
n->__frame = frame;
n->__panic = __go_panic_defer->__panic;
n->__pfn = pfn;
n->__arg = arg;
n->__retaddr = NULL;
__go_panic_defer->__defer = n;
}
/* This function is called when we want to undefer the stack. */
void
__go_undefer (void *frame)
{
if (__go_panic_defer == NULL)
return;
while (__go_panic_defer->__defer != NULL
&& __go_panic_defer->__defer->__frame == frame)
{
struct __go_defer_stack *d;
void (*pfn) (void *);
d = __go_panic_defer->__defer;
pfn = d->__pfn;
d->__pfn = NULL;
if (pfn != NULL)
(*pfn) (d->__arg);
__go_panic_defer->__defer = d->__next;
__go_free (d);
}
}
/* 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)
{
if (__go_panic_defer != NULL && __go_panic_defer->__defer != NULL)
__go_panic_defer->__defer->__retaddr = retaddr;
return 0;
}
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