Misc debugger enhancements and bug fixes....

src/runtime.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 10388 matching lines @@
     }
   }
   if (!pending_exception) {
     return *result;
   } else {
     return Failure::Exception();
   }
 }
 
 
+// Sets a v8 flag.
+static MaybeObject* Runtime_SetFlags(Arguments args) {
+  CONVERT_CHECKED(String, arg, args[0]);
+  SmartPointer<char> flags =
+      arg->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
+  FlagList::SetFlagsFromString(*flags, strlen(*flags));
+  return Heap::undefined_value();
+}
+
+
+// Performs a GC.
+// Presently, it only does a full GC.
+static MaybeObject* Runtime_CollectGarbage(Arguments args) {
+  Heap::CollectAllGarbage(true);
+  return Heap::undefined_value();
+}
+
+
+// Gets the current heap usage.
+static MaybeObject* Runtime_GetHeapUsage(Arguments args) {
+  int usage = Heap::SizeOfObjects();
+  if (!Smi::IsValid(usage)) {
+    return *Factory::NewNumberFromInt(usage);
+  }
+  return Smi::FromInt(usage);
+}
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
+
 #ifdef ENABLE_LOGGING_AND_PROFILING
-
 static MaybeObject* Runtime_ProfilerResume(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
 
   CONVERT_CHECKED(Smi, smi_modules, args[0]);
   CONVERT_CHECKED(Smi, smi_tag, args[1]);
   v8::V8::ResumeProfilerEx(smi_modules->value(), smi_tag->value());
   return Heap::undefined_value();
 }
 
@@ skipping 373 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal