Reset the path tracer completely, and check whether an object has source code...

Reset the path tracer completely, and check whether an object has source code before trying to print

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9749008
Patch from Jochen Eisigner <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11822 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -6636,7 +6636,7 @@ void PathTracer::TracePathFrom(Object** root) {
   ASSERT((search_target_ == kAnyGlobalObject) ||
          search_target_->IsHeapObject());
   found_target_in_trace_ = false;
-  object_stack_.Clear();
+  Reset();
 
   MarkVisitor mark_visitor(this);
   MarkRecursively(root, &mark_visitor);
@@ -6740,11 +6740,7 @@ void PathTracer::ProcessResults() {
     for (int i = 0; i < object_stack_.length(); i++) {
       if (i > 0) PrintF("\n     |\n     |\n     V\n\n");
       Object* obj = object_stack_[i];
-#ifdef OBJECT_PRINT
       obj->Print();
-#else
-      obj->ShortPrint();
-#endif
     }
     PrintF("=====================================\n");
   }

src/objects-printer.cc

@@ -761,8 +761,10 @@ void SharedFunctionInfo::SharedFunctionInfoPrint(FILE* out) {
   instance_class_name()->Print(out);
   PrintF(out, "\n - code = ");
   code()->ShortPrint(out);
-  PrintF(out, "\n - source code = ");
-  GetSourceCode()->ShortPrint(out);
+  if (HasSourceCode()) {
+    PrintF(out, "\n - source code = ");
+    GetSourceCode()->ShortPrint(out);
+  }
   // Script files are often large, hard to read.
   // PrintF(out, "\n - script =");
   // script()->Print(out);