1 /* go-panic.c -- support for the go panic function.
3 Copyright 2009 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
16 #include "go-string.h"
17 #include "interface.h"
19 /* Print the panic stack. This is used when there is no recover. */
22 __printpanics (struct __go_panic_stack *p)
24 if (p->__next != NULL)
26 __printpanics (p->__next);
31 if (p->__was_recovered)
32 printf (" [recovered]");
36 /* This implements __go_panic which is used for the panic
40 __go_panic (struct __go_empty_interface arg)
42 struct __go_panic_stack *n;
44 n = (struct __go_panic_stack *) __go_alloc (sizeof (struct __go_panic_stack));
49 /* Run all the defer functions. */
53 struct __go_defer_stack *d;
67 if (n->__was_recovered)
69 /* Some defer function called recover. That means that
70 we should stop running this panic. */
75 /* Now unwind the stack by throwing an exception. The
76 compiler has arranged to create exception handlers in
77 each function which uses a defer statement. These
78 exception handlers will check whether the entry on
79 the top of the defer stack is from the current
80 function. If it is, we have unwound the stack far
84 /* __go_unwind_stack should not return. */
88 /* Because we executed that defer function by a panic, and
89 it did not call recover, we know that we are not
90 returning from the calling function--we are panicing
99 /* The panic was not recovered. */
101 __printpanics (g->panic);
103 /* FIXME: We should dump a call stack here. */
107 /* This is used by the runtime library. */
110 __go_panic_msg (const char* msg)
113 unsigned char *sdata;
114 struct __go_string s;
115 struct __go_empty_interface arg;
117 len = __builtin_strlen (msg);
118 sdata = runtime_mallocgc (len, FlagNoPointers, 0, 0);
119 __builtin_memcpy (sdata, msg, len);
122 newErrorString(s, &arg);