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// Copyright 2012 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 "runtime.h"
#include "malloc.h"
#include "go-defer.h"
#include "go-panic.h"
// Code related to defer, panic and recover.
uint32 runtime_panicking;
static Lock paniclk;
// Run all deferred functions for the current goroutine.
static void
rundefer(void)
{
G *g;
Defer *d;
g = runtime_g();
while((d = g->defer) != nil) {
void (*pfn)(void*);
g->defer = d->__next;
pfn = d->__pfn;
d->__pfn = nil;
if (pfn != nil)
(*pfn)(d->__arg);
runtime_free(d);
}
}
void
runtime_startpanic(void)
{
M *m;
m = runtime_m();
if(runtime_mheap == 0 || runtime_mheap->cachealloc.size == 0) { // very early
runtime_printf("runtime: panic before malloc heap initialized\n");
m->mallocing = 1; // tell rest of panic not to try to malloc
} else if(m->mcache == nil) // can happen if called from signal handler or throw
m->mcache = runtime_allocmcache();
if(m->dying) {
runtime_printf("panic during panic\n");
runtime_exit(3);
}
m->dying = 1;
runtime_xadd(&runtime_panicking, 1);
runtime_lock(&paniclk);
}
void
runtime_dopanic(int32 unused __attribute__ ((unused)))
{
G *g;
static bool didothers;
bool crash;
g = runtime_g();
if(g->sig != 0)
runtime_printf("[signal %x code=%p addr=%p]\n",
g->sig, (void*)g->sigcode0, (void*)g->sigcode1);
if(runtime_gotraceback(&crash)){
if(g != runtime_m()->g0) {
runtime_printf("\n");
runtime_goroutineheader(g);
runtime_traceback();
runtime_goroutinetrailer(g);
}
if(!didothers) {
didothers = true;
runtime_tracebackothers(g);
}
}
runtime_unlock(&paniclk);
if(runtime_xadd(&runtime_panicking, -1) != 0) {
// Some other m is panicking too.
// Let it print what it needs to print.
// Wait forever without chewing up cpu.
// It will exit when it's done.
static Lock deadlock;
runtime_lock(&deadlock);
runtime_lock(&deadlock);
}
if(crash)
runtime_crash();
runtime_exit(2);
}
void
runtime_throw(const char *s)
{
M *mp;
mp = runtime_m();
if(mp->throwing == 0)
mp->throwing = 1;
runtime_startpanic();
runtime_printf("fatal error: %s\n", s);
runtime_dopanic(0);
*(int32*)0 = 0; // not reached
runtime_exit(1); // even more not reached
}
void
runtime_panicstring(const char *s)
{
Eface err;
if(runtime_m()->gcing) {
runtime_printf("panic: %s\n", s);
runtime_throw("panic during gc");
}
runtime_newErrorString(runtime_gostringnocopy((const byte*)s), &err);
runtime_panic(err);
}
void runtime_Goexit (void) __asm__ (GOSYM_PREFIX "runtime.Goexit");
void
runtime_Goexit(void)
{
rundefer();
runtime_goexit();
}
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