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