code review 7098050: runtime: dump full stacks on throw and signals

src/pkg/runtime/symtab.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.
 
 // Runtime symbol table access.  Work in progress.
 // The Plan 9 symbol table is not in a particularly convenient form.
 // The routines here massage it into a more usable form; eventually
 // we'll change 6l to do this for us, but it is easier to experiment
 // here than to change 6l and all the other tools.
 //
@@ skipping 541 matching lines @@
         for(i=0; i<s.len; i++) {
                 if(s.str[i] != p[0])
                         continue;
                 if(hasprefix((String){s.str + i, s.len - i}, p))
                         return 1;
         }
         return 0;
 }
 
 bool
-runtime·showframe(Func *f)
+runtime·showframe(Func *f, bool current)
 {
         static int32 traceback = -1;
 
-        if(runtime·throwing)
+        if(current && m->throwing > 0)
                 return 1;
         if(traceback < 0)
                 traceback = runtime·gotraceback();
-        return traceback > 1 || contains(f->name, ".") && !hasprefix(f->name, "runtime.");
-}
+        return traceback > 1 || f != nil && contains(f->name, ".") && !hasprefix(f->name, "runtime.");
+}