[d8] Make exception reporting more resilient.

src/d8.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.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 910 matching lines @@
     // V8 didn't provide any extra information about this error; just
     // print the exception.
     printf("%s\n", exception_string);
   } else {
     // Print (filename):(line number): (message).
     v8::String::Utf8Value filename(message->GetScriptOrigin().ResourceName());
     const char* filename_string = ToCString(filename);
     Maybe<int> maybeline = message->GetLineNumber(isolate->GetCurrentContext());
     int linenum = maybeline.IsJust() ? maybeline.FromJust() : -1;
     printf("%s:%i: %s\n", filename_string, linenum, exception_string);
-    if (maybeline.IsJust()) {
+    Local<String> sourceline;
+    if (message->GetSourceLine(isolate->GetCurrentContext())
+            .ToLocal(&sourceline)) {
       // Print line of source code.
-      v8::String::Utf8Value sourceline(
-          message->GetSourceLine(isolate->GetCurrentContext())
-              .ToLocalChecked());
-      const char* sourceline_string = ToCString(sourceline);
+      v8::String::Utf8Value sourcelinevalue(sourceline);
+      const char* sourceline_string = ToCString(sourcelinevalue);
       printf("%s\n", sourceline_string);
       // Print wavy underline (GetUnderline is deprecated).
       int start =
           message->GetStartColumn(isolate->GetCurrentContext()).FromJust();
       for (int i = 0; i < start; i++) {
         printf(" ");
       }
       int end = message->GetEndColumn(isolate->GetCurrentContext()).FromJust();
       for (int i = start; i < end; i++) {
         printf("^");
@@ skipping 1603 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif