Add FLAG_trace_maps

src/objects-printer.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
 #include "src/jsregexp.h"
@@ skipping 1111 matching lines @@
       os << ", attrs: " << details.attributes();
     }
     os << " -> " << Brief(target) << "\n";
   }
 }
 
 
 #endif  // OBJECT_PRINT
 
 
+#if TRACE_MAPS
+
+
+void Name::NameShortPrint() {
+  if (this->IsString()) {
+    PrintF("%s", String::cast(this)->ToCString().get());
+  } else {
+    DCHECK(this->IsSymbol());
+    Symbol* s = Symbol::cast(this);
+    if (s->name()->IsUndefined()) {
+      PrintF("#<%s>", s->PrivateSymbolToName());
+    } else {
+      PrintF("<%s>", String::cast(s->name())->ToCString().get());
+    }
+  }
+}
+
+
+int Name::NameShortPrint(Vector<char> str) {
+  if (this->IsString()) {
+    return SNPrintF(str, "%s", String::cast(this)->ToCString().get());
+  } else {
+    DCHECK(this->IsSymbol());
+    Symbol* s = Symbol::cast(this);
+    if (s->name()->IsUndefined()) {
+      return SNPrintF(str, "#<%s>", s->PrivateSymbolToName());
+    } else {
+      return SNPrintF(str, "<%s>", String::cast(s->name())->ToCString().get());
+    }
+  }
+}
+
+
+#endif  // TRACE_MAPS
 } }  // namespace v8::internal