libgo: Update Go library to master revision 15502/229081515358.

From-SVN: r195569

6 files changed, 29 insertions, 12 deletions

diff --git a/libgo/runtime/go-traceback.c b/libgo/runtime/go-traceback.c
index 11cc052..30a5ed9 100644
--- a/libgo/runtime/go-traceback.c
+++ b/libgo/runtime/go-traceback.c
@@ -17,11 +17,11 @@ runtime_traceback ()
   int32 c;
 
   c = runtime_callers (1, pcbuf, sizeof pcbuf / sizeof pcbuf[0]);
-  runtime_printtrace (pcbuf, c);
+  runtime_printtrace (pcbuf, c, true);
 }
 
 void
-runtime_printtrace (uintptr *pcbuf, int32 c)
+runtime_printtrace (uintptr *pcbuf, int32 c, bool current)
 {
   int32 i;
 
@@ -32,7 +32,7 @@ runtime_printtrace (uintptr *pcbuf, int32 c)
       intgo line;
 
       if (__go_file_line (pcbuf[i], &fn, &file, &line)
-	  && runtime_showframe (fn))
+	  && runtime_showframe (fn, current))
 	{
 	  runtime_printf ("%S\n", fn);
 	  runtime_printf ("\t%S:%D\n", file, (int64) line);
diff --git a/libgo/runtime/panic.c b/libgo/runtime/panic.c
index 23a56f3..7b9b578 100644
--- a/libgo/runtime/panic.c
+++ b/libgo/runtime/panic.c
@@ -86,6 +86,11 @@ runtime_dopanic(int32 unused __attribute__ ((unused)))
 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);
diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index e805c90..b2e37f3 100644
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -528,6 +528,7 @@ runtime_main(void)
 	setmcpumax(runtime_gomaxprocs);
 	runtime_sched.init = true;
 	scvg = __go_go(runtime_MHeap_Scavenger, nil);
+	scvg->issystem = true;
 	main_init();
 	runtime_sched.init = false;
 	if(!runtime_sched.lockmain)
@@ -638,12 +639,16 @@ void
 runtime_tracebackothers(G * volatile me)
 {
 	G * volatile gp;
-	Traceback traceback;
+	Traceback tb;
+	int32 traceback;
 
-	traceback.gp = me;
+	tb.gp = me;
+	traceback = runtime_gotraceback();
 	for(gp = runtime_allg; gp != nil; gp = gp->alllink) {
 		if(gp == me || gp->status == Gdead)
 			continue;
+		if(gp->issystem && traceback < 2)
+			continue;
 		runtime_printf("\n");
 		runtime_goroutineheader(gp);
 
@@ -661,7 +666,7 @@ runtime_tracebackothers(G * volatile me)
 			continue;
 		}
 
-		gp->traceback = &traceback;
+		gp->traceback = &tb;
 
 #ifdef USING_SPLIT_STACK
 		__splitstack_getcontext(&me->stack_context[0]);
@@ -672,7 +677,7 @@ runtime_tracebackothers(G * volatile me)
 			runtime_gogo(gp);
 		}
 
-		runtime_printtrace(traceback.pcbuf, traceback.c);
+		runtime_printtrace(tb.pcbuf, tb.c, false);
 		runtime_goroutinetrailer(gp);
 	}
 }
@@ -975,6 +980,7 @@ top:
 	if((scvg == nil && runtime_sched.grunning == 0) ||
 	   (scvg != nil && runtime_sched.grunning == 1 && runtime_sched.gwait == 0 &&
 	    (scvg->status == Grunning || scvg->status == Gsyscall))) {
+		m->throwing = -1;  // do not dump full stacks
 		runtime_throw("all goroutines are asleep - deadlock!");
 	}
 
diff --git a/libgo/runtime/runtime.c b/libgo/runtime/runtime.c
index b090169..48ece55 100644
--- a/libgo/runtime/runtime.c
+++ b/libgo/runtime/runtime.c
@@ -132,10 +132,12 @@ runtime_cputicks(void)
 }
 
 bool
-runtime_showframe(String s)
+runtime_showframe(String s, bool current)
 {
 	static int32 traceback = -1;
-	
+
+	if(current && runtime_m()->throwing > 0)
+		return 1;
 	if(traceback < 0)
 		traceback = runtime_gotraceback();
 	return traceback > 1 || (__builtin_memchr(s.str, '.', s.len) != nil && __builtin_memcmp(s.str, "runtime.", 7) != 0);
diff --git a/libgo/runtime/runtime.h b/libgo/runtime/runtime.h
index a937503..de72f42 100644
--- a/libgo/runtime/runtime.h
+++ b/libgo/runtime/runtime.h
@@ -178,6 +178,7 @@ struct	G
 	G*	schedlink;
 	bool	readyonstop;
 	bool	ispanic;
+	bool	issystem;
 	int8	raceignore; // ignore race detection events
 	M*	m;		// for debuggers, but offset not hard-coded
 	M*	lockedm;
@@ -208,6 +209,7 @@ struct	M
 	G*	curg;		// current running goroutine
 	int32	id;
 	int32	mallocing;
+	int32	throwing;
 	int32	gcing;
 	int32	locks;
 	int32	nomemprof;
@@ -389,7 +391,7 @@ void	runtime_goroutineheader(G*);
 void	runtime_goroutinetrailer(G*);
 void	runtime_traceback();
 void	runtime_tracebackothers(G*);
-void	runtime_printtrace(uintptr*, int32);
+void	runtime_printtrace(uintptr*, int32, bool);
 String	runtime_gostringnocopy(const byte*);
 void*	runtime_mstart(void*);
 G*	runtime_malg(int32, byte**, size_t*);
@@ -593,7 +595,7 @@ void	runtime_osyield(void);
 void	runtime_LockOSThread(void) __asm__ (GOSYM_PREFIX "runtime.LockOSThread");
 void	runtime_UnlockOSThread(void) __asm__ (GOSYM_PREFIX "runtime.UnlockOSThread");
 
-bool	runtime_showframe(String);
+bool	runtime_showframe(String, bool);
 
 uintptr	runtime_memlimit(void);
 
diff --git a/libgo/runtime/time.goc b/libgo/runtime/time.goc
index d497361..9a5cbdf 100644
--- a/libgo/runtime/time.goc
+++ b/libgo/runtime/time.goc
@@ -110,8 +110,10 @@ addtimer(Timer *t)
 			runtime_ready(timers.timerproc);
 		}
 	}
-	if(timers.timerproc == nil)
+	if(timers.timerproc == nil) {
 		timers.timerproc = __go_go(timerproc, nil);
+		timers.timerproc->issystem = true;
+	}
 }
 
 // Delete timer t from the heap.