Function.caller when caller is a strict function.

src/accessors.cc

 // Copyright 2006-2008 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 809 matching lines @@
   ReadOnlySetAccessor,
   0
 };
 
 
 //
 // Accessors::FunctionCaller
 //
 
 
+static MaybeObject* CheckNonStrictCallerOrThrow(
+    Isolate* isolate,
+    JSFunction* caller) {
+  DisableAssertNoAllocation enable_allocation;
+  if (caller->shared()->strict_mode()) {
+    return isolate->Throw(
+        *isolate->factory()->NewTypeError("strict_caller",
+                                          HandleVector<Object>(NULL, 0)));
+  }
+  return caller;
+}
+
+
 MaybeObject* Accessors::FunctionGetCaller(Object* object, void*) {
   Isolate* isolate = Isolate::Current();
   HandleScope scope(isolate);
   AssertNoAllocation no_alloc;
   bool found_it = false;
   JSFunction* holder = FindInPrototypeChain<JSFunction>(object, &found_it);
   if (!found_it) return isolate->heap()->undefined_value();
   Handle<JSFunction> function(holder, isolate);
 
   List<JSFunction*> functions(2);
   for (JavaScriptFrameIterator it; !it.done(); it.Advance()) {
     JavaScriptFrame* frame = it.frame();
     frame->GetFunctions(&functions);
     for (int i = functions.length() - 1; i >= 0; i--) {
       if (functions[i] == *function) {
         // Once we have found the frame, we need to go to the caller
         // frame. This may require skipping through a number of top-level
         // frames, e.g. frames for scripts not functions.
         if (i > 0) {
           ASSERT(!functions[i - 1]->shared()->is_toplevel());
-          return functions[i - 1];
+          return CheckNonStrictCallerOrThrow(isolate, functions[i - 1]);
         } else {
           for (it.Advance(); !it.done(); it.Advance()) {
             frame = it.frame();
             functions.Rewind(0);
             frame->GetFunctions(&functions);
             if (!functions.last()->shared()->is_toplevel()) {
-              return functions.last();
+              return CheckNonStrictCallerOrThrow(isolate, functions.last());
             }
             ASSERT(functions.length() == 1);
           }
           if (it.done()) return isolate->heap()->null_value();
           break;
         }
       }
     }
     functions.Rewind(0);
   }
@@ skipping 34 matching lines @@
 }
 
 
 const AccessorDescriptor Accessors::ObjectPrototype = {
   ObjectGetPrototype,
   ObjectSetPrototype,
   0
 };
 
 } }  // namespace v8::internal