Add an --omit-quit flag to d8 for Emscripten's sake.

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 906 matching lines @@
   global_template->Set(String::NewFromUtf8(isolate, "write"),
                        FunctionTemplate::New(isolate, Write));
   global_template->Set(String::NewFromUtf8(isolate, "read"),
                        FunctionTemplate::New(isolate, Read));
   global_template->Set(String::NewFromUtf8(isolate, "readbuffer"),
                        FunctionTemplate::New(isolate, ReadBuffer));
   global_template->Set(String::NewFromUtf8(isolate, "readline"),
                        FunctionTemplate::New(isolate, ReadLine));
   global_template->Set(String::NewFromUtf8(isolate, "load"),
                        FunctionTemplate::New(isolate, Load));
-  global_template->Set(String::NewFromUtf8(isolate, "quit"),
-                       FunctionTemplate::New(isolate, Quit));
+  // Some Emscripten-generated code tries to call 'quit', which in turn would
+  // call C's exit(). This would lead to memory leaks, because there is no way
+  // we can terminate cleanly then, so we need a way to hide 'quit'.
+  if (!options.omit_quit) {
+    global_template->Set(String::NewFromUtf8(isolate, "quit"),
+                         FunctionTemplate::New(isolate, Quit));
+  }
   global_template->Set(String::NewFromUtf8(isolate, "version"),
                        FunctionTemplate::New(isolate, Version));
 
   // Bind the Realm object.
   Handle<ObjectTemplate> realm_template = ObjectTemplate::New(isolate);
   realm_template->Set(String::NewFromUtf8(isolate, "current"),
                       FunctionTemplate::New(isolate, RealmCurrent));
   realm_template->Set(String::NewFromUtf8(isolate, "owner"),
                       FunctionTemplate::New(isolate, RealmOwner));
   realm_template->Set(String::NewFromUtf8(isolate, "global"),
@@ skipping 428 matching lines @@
       options.test_shell = true;
       argv[i] = NULL;
     } else if (strcmp(argv[i], "--send-idle-notification") == 0) {
       options.send_idle_notification = true;
       argv[i] = NULL;
     } else if (strcmp(argv[i], "--invoke-weak-callbacks") == 0) {
       options.invoke_weak_callbacks = true;
       // TODO(jochen) See issue 3351
       options.send_idle_notification = true;
       argv[i] = NULL;
+    } else if (strcmp(argv[i], "--omit-quit") == 0) {
+      options.omit_quit = true;
+      argv[i] = NULL;
     } else if (strcmp(argv[i], "-f") == 0) {
       // Ignore any -f flags for compatibility with other stand-alone
       // JavaScript engines.
       continue;
     } else if (strcmp(argv[i], "--isolate") == 0) {
 #ifdef V8_SHARED
       printf("D8 with shared library does not support multi-threading\n");
       return false;
 #endif  // V8_SHARED
       options.num_isolates++;
@@ skipping 330 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif