Harden a few builtins

src/isolate.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 <stdlib.h>
 
 #include "v8.h"
 
 #include "ast.h"
 #include "bootstrapper.h"
@@ skipping 1115 matching lines @@
             String::cast(location->script()->name())->ToCString().get(),
             line_number);
       } else if (location->script()->name()->IsString()) {
         OS::PrintError(
             "Extension or internal compilation error in %s at line %d.\n",
             String::cast(location->script()->name())->ToCString().get(),
             line_number);
       } else {
         OS::PrintError("Extension or internal compilation error.\n");
       }
+#ifdef OBJECT_PRINT
+      // Since comments and empty lines have been stripped from the source of
+      // builtins, print the actual source here so that line numbers match.
+      if (location->script()->source()->IsString()) {
+        Handle<String> src(String::cast(location->script()->source()));
+        PrintF("Failing script:\n");
+        int len = src->length();
+        int line_number = 1;
+        PrintF("%5d: ", line_number);
+        for (int i = 0; i < len; i++) {
+          uint16_t character = src->Get(i);
+          PrintF("%c", character);
+          if (character == '\n' && i < len - 2) {
+            PrintF("%5d: ", ++line_number);
+          }
+        }
+      }
+#endif
     }
   }
 
   // Save the message for reporting if the the exception remains uncaught.
   thread_local_top()->has_pending_message_ = report_exception;
 
   // Do not forget to clean catcher_ if currently thrown exception cannot
   // be caught.  If necessary, ReThrow will update the catcher.
   thread_local_top()->catcher_ = can_be_caught_externally ?
       try_catch_handler() : NULL;
@@ skipping 1142 matching lines @@
       Execution::Call(this, microtask, factory()->undefined_value(),
                       0, NULL).Check();
     }
   }
 
   handle_scope_implementer()->DecrementCallDepth();
 }
 
 
 } }  // namespace v8::internal