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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-defer.c] - Rev 756
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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 "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; }
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