runtime: turn divide by zero, nil dereference into panics
tested on linux/amd64, linux/386, linux/arm, darwin/amd64, darwin/386.
freebsd untested; will finish in a separate CL.
for now all the panics are errorStrings.
richer structures can be added as necessary
once the mechanism is shaked out.
R=r
CC=golang-dev
https://golang.org/cl/906041
diff --git a/src/pkg/runtime/darwin/thread.c b/src/pkg/runtime/darwin/thread.c
index 38e3c23..d9acfa8 100644
--- a/src/pkg/runtime/darwin/thread.c
+++ b/src/pkg/runtime/darwin/thread.c
@@ -6,6 +6,8 @@
#include "defs.h"
#include "os.h"
+extern SigTab sigtab[];
+
static void
unimplemented(int8 *name)
{
@@ -443,3 +445,26 @@
}
}
+void
+sigpanic(void)
+{
+ switch(g->sig) {
+ case SIGBUS:
+ if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
+ panicstring("invalid memory address or nil pointer dereference");
+ break;
+ case SIGSEGV:
+ if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR) && g->sigcode1 < 0x1000)
+ panicstring("invalid memory address or nil pointer dereference");
+ break;
+ 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);
+}
