Hide private corelib's method from stack trace in exceptions.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
===================================================================
--- runtime/vm/exceptions.cc	(revision 17487)
+++ runtime/vm/exceptions.cc	(working copy)
@@ -20,11 +20,20 @@
             "Prints a stack trace everytime a throw occurs.");
 DEFINE_FLAG(bool, heap_profile_out_of_memory, false,
             "Writes a heap profile on unhandled out-of-memory exceptions.");
+DEFINE_FLAG(bool, verbose_stacktrace, false,
+    "Stack traces will include methods marked invisible.");
 
-
 const char* Exceptions::kCastErrorDstName = "type cast";
 
 
+static bool ShouldShowFunction(const Function& function) {
+  if (FLAG_verbose_stacktrace) {
+    return true;
+  }
+  return function.is_visible();
+}
+
+
 // Iterate through the stack frames and try to find a frame with an
 // exception handler. Once found, set the pc, sp and fp so that execution
 // can continue in that frame.
@@ -56,16 +65,20 @@
           ASSERT(pc != 0);
           code = func.unoptimized_code();
           offset = Smi::New(pc - code.EntryPoint());
+          if (ShouldShowFunction(func)) {
+            func_list.Add(func);
+            code_list.Add(code);
+            pc_offset_list.Add(offset);
+          }
+        }
+      } else {
+        offset = Smi::New(frame->pc() - code.EntryPoint());
+        func = code.function();
+        if (ShouldShowFunction(func)) {
           func_list.Add(func);
           code_list.Add(code);
           pc_offset_list.Add(offset);
         }
-      } else {
-        offset = Smi::New(frame->pc() - code.EntryPoint());
-        func = code.function();
-        func_list.Add(func);
-        code_list.Add(code);
-        pc_offset_list.Add(offset);
       }
       if (frame->FindExceptionHandler(handler_pc)) {
         *handler_sp = frame->sp();