test cleanup

- do not print tracebacks if $GOTRACEBACK=0
	- set GOTRACEBACK=0 during tests
	- filter out pc numbers in errors

R=r
DELTA=70  (22 added, 30 deleted, 18 changed)
OCL=15618
CL=15642

src/runtime/rt1_amd64_darwin.c

@@ -150,9 +150,11 @@ sighandler(int32 sig, siginfo *info, void *context)
 	prints("\npc: 0x");  sys·printpointer((void *)ss->__rip);
 	prints("\n\n");
 
-	traceback((void *)ss->__rip, (void *)ss->__rsp, (void*)ss->__r15);
-	tracebackothers((void*)ss->__r15);
-	print_thread_state(ss);
+	if(gotraceback()){
+		traceback((void *)ss->__rip, (void *)ss->__rsp, (void*)ss->__r15);
+		tracebackothers((void*)ss->__r15);
+		print_thread_state(ss);
+	}
 
 	sys·exit(2);
 }

src/runtime/rt1_amd64_linux.c

@@ -140,7 +140,7 @@ sighandler(int32 sig, siginfo* info, void** context)
 	if(panicking)	// traceback already printed
 		sys·exit(2);
 
-        struct sigcontext *sc = &(((struct ucontext *)context)->uc_mcontext);
+	struct sigcontext *sc = &(((struct ucontext *)context)->uc_mcontext);
 
 	if(sig < 0 || sig >= NSIG){
 		prints("Signal ");
@@ -149,13 +149,15 @@ sighandler(int32 sig, siginfo* info, void** context)
 		prints(sigtab[sig].name);
 	}
 
-        prints("\nFaulting address: 0x");  sys·printpointer(info->si_addr);
-        prints("\npc: 0x");  sys·printpointer((void *)sc->rip);
-        prints("\n\n");
+	prints("\nFaulting address: 0x");  sys·printpointer(info->si_addr);
+	prints("\npc: 0x");  sys·printpointer((void *)sc->rip);
+	prints("\n\n");
 
-	traceback((void *)sc->rip, (void *)sc->rsp, (void *)sc->r15);
-	tracebackothers((void*)sc->r15);
-	print_sigcontext(sc);
+	if(gotraceback()){
+		traceback((void *)sc->rip, (void *)sc->rsp, (void *)sc->r15);
+		tracebackothers((void*)sc->r15);
+		print_sigcontext(sc);
+	}
 
 	sys·breakpoint();
 	sys·exit(2);

src/runtime/runtime.c

@@ -6,6 +6,17 @@
 
 int32	panicking = 0;
 
+int32
+gotraceback(void)
+{
+	byte *p;
+
+	p = getenv("GOTRACEBACK");
+	if(p == nil || p[0] == '\0')
+		return 1;	// default is on
+	return atoi(p);
+}
+
 void
 sys·panicl(int32 lno)
 {
@@ -17,8 +28,10 @@ sys·panicl(int32 lno)
 	sys·printpc(&lno);
 	prints("\n");
 	sp = (uint8*)&lno;
-	traceback(sys·getcallerpc(&lno), sp, g);
-	tracebackothers(g);
+	if(gotraceback()){
+		traceback(sys·getcallerpc(&lno), sp, g);
+		tracebackothers(g);
+	}
 	panicking = 1;
 	sys·breakpoint();  // so we can grab it in a debugger
 	sys·exit(2);

src/runtime/runtime.h

@@ -212,6 +212,7 @@ void	mcpy(byte*, byte*, uint32);
 void*	mal(uint32);
 uint32	cmpstring(string, string);
 void	initsig(void);
+int32	gotraceback(void);
 void	traceback(uint8 *pc, uint8 *sp, G* gp);
 void	tracebackothers(G*);
 int32	open(byte*, int32, ...);

test/golden.out

@@ -128,17 +128,7 @@ BUG: compilation succeeds incorrectly
 throw: ifaces2i: nil pointer
 SIGSEGV: segmentation violation
 Faulting address: 0x0
-pc: 0x1c11
-
-0x1c11?zi
-	throw(30465, 0, 0, ...)
-	throw(0x7701, 0x0, 0x0, ...)
-0x2113?zi
-	sys·ifaces2i(31496, 0, 31536, ...)
-	sys·ifaces2i(0x7b08, 0x7b30, 0x0, ...)
-0x136f?zi
-	main·main(1, 0, 1606414952, ...)
-	main·main(0x1, 0x7fff5fbff268, 0x0, ...)
+pc: xxx
 
 BUG: fails incorrectly
 
@@ -152,18 +142,12 @@ BUG: fails incorrectly
 =========== bugs/bug095.go
 found 2, expected 1
 
-panic on line 352 PC=0x139e
-0x139e?zi
-	main·main(1, 0, 1606414952, ...)
-	main·main(0x1, 0x7fff5fbff268, 0x0, ...)
+panic on line 352 PC=xxx
 BUG wrong result
 
 =========== bugs/bug097.go
 
-panic on line 354 PC=0x13bc
-0x13bc?zi
-	main·main(1, 0, 1606414952, ...)
-	main·main(0x1, 0x7fff5fbff268, 0x0, ...)
+panic on line 354 PC=xxx
 BUG wrong result
 
 =========== bugs/bug098.go
@@ -176,28 +160,14 @@ BUG should compile
 done1
 SIGSEGV: segmentation violation
 Faulting address: 0x0
-pc: 0x0
-
-0x0?zi
-	panic(5070, 0, 45192, ...)
-	panic(0x13ce, 0xb088, 0xb088, ...)
+pc: xxx
 
 
 =========== bugs/bug102.go
 throw: index out of range
 SIGSEGV: segmentation violation
 Faulting address: 0x0
-pc: 0x2615
-
-0x2615?zi
-	throw(31052, 0, 0, ...)
-	throw(0x794c, 0x0, 0x1315, ...)
-0x2569?zi
-	sys·throwindex(45096, 0, 0, ...)
-	sys·throwindex(0xb028, 0x0, 0x0, ...)
-0x1315?zi
-	main·main(1, 0, 1606414952, ...)
-	main·main(0x1, 0x7fff5fbff268, 0x0, ...)
+pc: xxx
 
 
 =========== fixedbugs/bug016.go

test/run

@@ -15,6 +15,7 @@ esac
 
 export G=${A}g
 export L=${A}l
+export GOTRACEBACK=0
 
 failed=0
 
@@ -55,6 +56,9 @@ done | # clean up some stack noise
 	egrep -v '^(r[0-9a-z]+|[cfg]s)  +0x'  |
 	sed '/tmp.*Bus error/s/.*Bus/Bus/; /tmp.*Trace.BPT/s/.*Trace/Trace/
 		s!'$RUNFILE'!$RUNFILE!g
+		s/ PC=0x[0-9a-f]*/ PC=xxx/
+		s/^pc: 0x[0-9a-f]*/pc: xxx/
+		/^Trace\/breakpoint trap/d
 		/RUNFILE/ s/line 1: *[0-9]*/line 1: PID/' > run.out
 
 case $failed in