127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/* go-panic.c -- support for the go panic function.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "runtime.h"
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#include "arch.h"
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#include "malloc.h"
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#include "go-alloc.h"
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#include "go-defer.h"
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#include "go-panic.h"
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#include "go-string.h"
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#include "interface.h"
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/* Print the panic stack. This is used when there is no recover. */
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static void
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__printpanics (struct __go_panic_stack *p)
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{
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if (p->__next != NULL)
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{
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__printpanics (p->__next);
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printf ("\t");
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}
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printf ("panic: ");
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printany (p->__arg);
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if (p->__was_recovered)
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printf (" [recovered]");
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putchar ('\n');
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}
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/* This implements __go_panic which is used for the panic
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function. */
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void
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__go_panic (struct __go_empty_interface arg)
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{
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G *g;
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struct __go_panic_stack *n;
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g = runtime_g ();
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n = (struct __go_panic_stack *) __go_alloc (sizeof (struct __go_panic_stack));
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n->__arg = arg;
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n->__next = g->panic;
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g->panic = n;
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/* Run all the defer functions. */
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while (1)
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{
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struct __go_defer_stack *d;
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void (*pfn) (void *);
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d = g->defer;
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if (d == NULL)
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break;
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pfn = d->__pfn;
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d->__pfn = NULL;
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if (pfn != NULL)
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{
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(*pfn) (d->__arg);
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if (n->__was_recovered)
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{
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/* Some defer function called recover. That means that
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we should stop running this panic. */
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g->panic = n->__next;
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__go_free (n);
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/* Now unwind the stack by throwing an exception. The
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compiler has arranged to create exception handlers in
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each function which uses a defer statement. These
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exception handlers will check whether the entry on
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the top of the defer stack is from the current
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function. If it is, we have unwound the stack far
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enough. */
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__go_unwind_stack ();
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/* __go_unwind_stack should not return. */
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abort ();
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}
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/* Because we executed that defer function by a panic, and
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it did not call recover, we know that we are not
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returning from the calling function--we are panicing
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through it. */
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*d->__frame = 0;
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}
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g->defer = d->__next;
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__go_free (d);
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}
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/* The panic was not recovered. */
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runtime_startpanic ();
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__printpanics (g->panic);
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runtime_dopanic (0);
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}
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/* This is used by the runtime library. */
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void
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__go_panic_msg (const char* msg)
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{
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size_t len;
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unsigned char *sdata;
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struct __go_string s;
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struct __go_empty_interface arg;
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len = __builtin_strlen (msg);
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sdata = runtime_mallocgc (len, FlagNoPointers, 0, 0);
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__builtin_memcpy (sdata, msg, len);
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s.__data = sdata;
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s.__length = len;
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newErrorString(s, &arg);
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__go_panic (arg);
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}
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