code review 906041: runtime: turn divide by zero, nil dereference into panics

src/pkg/runtime/linux/thread.c

 // 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 "runtime.h"
 #include "defs.h"
 #include "os.h"
 
 extern SigTab sigtab[];
 
@@ skipping 260 matching lines @@
         m->gsignal = malg(32*1024);     // OS X wants >=8K, Linux >=2K
         signalstack(m->gsignal->stackguard, 32*1024);
 }
 
 void
 sigpanic(void)
 {
         switch(g->sig) {
         case SIGBUS:
                 if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
-                        goto badaddr;

[r, 2010/04/08 23:54:08]

again

+                        panicstring("invalid memory address or nil pointer dereference");
                 break;
         case SIGSEGV:
                 if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000)
-                        goto badaddr;
+                        panicstring("invalid memory address or nil pointer dereference");
                 break;
-        badaddr:
-                panicstring("invalid memory address or nil pointer dereference");
         case SIGFPE:
                 switch(g->sigcode0) {
                 case FPE_INTDIV:
                         panicstring("integer divide by zero");
                 case FPE_INTOVF:
                         panicstring("integer overflow");
                 }
                 panicstring("floating point error");
         }
         panicstring(sigtab[g->sig].name);
 }