[es6] Parameter scopes for sloppy eval

src/contexts.h

 // 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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 276 matching lines @@
 //                function contexts, and non-NULL for 'with' contexts.
 //                Used to implement the 'with' statement.
 //
 // [ extension ]  A pointer to an extension JSObject, or NULL. Used to
 //                implement 'with' statements and dynamic declarations
 //                (through 'eval'). The object in a 'with' statement is
 //                stored in the extension slot of a 'with' context.
 //                Dynamically declared variables/functions are also added
 //                to lazily allocated extension object. Context::Lookup
 //                searches the extension object for properties.
-//                For global and block contexts, contains the respective
-//                ScopeInfo.
+//                For script and block contexts, contains the respective
+//                ScopeInfo. For block contexts representing sloppy declaration
+//                block scopes, it may also be a struct being a
+//                SloppyBlockWithEvalContextExtension, pairing the ScopeInfo
+//                with an extension object.
 //                For module contexts, points back to the respective JSModule.
 //
 // [ global_object ]  A pointer to the global object. Provided for quick
 //                access to the global object from inside the code (since
 //                we always have a context pointer).
 //
 // In addition, function contexts may have statically allocated context slots
 // to store local variables/functions that are accessed from inner functions
 // (via static context addresses) or through 'eval' (dynamic context lookups).
 // The native context contains additional slots for fast access to native
@@ skipping 49 matching lines @@
   JSFunction* closure() { return JSFunction::cast(get(CLOSURE_INDEX)); }
   void set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); }
 
   Context* previous() {
     Object* result = unchecked_previous();
     DCHECK(IsBootstrappingOrValidParentContext(result, this));
     return reinterpret_cast<Context*>(result);
   }
   void set_previous(Context* context) { set(PREVIOUS_INDEX, context); }
 
-  bool has_extension() { return extension() != NULL; }
+  bool has_extension() { return extension() != nullptr; }
   Object* extension() { return get(EXTENSION_INDEX); }
   void set_extension(Object* object) { set(EXTENSION_INDEX, object); }
+  JSObject* extension_object();
+  JSReceiver* extension_receiver();
+  ScopeInfo* scope_info();
+  String* catch_name();
 
   JSModule* module() { return JSModule::cast(get(EXTENSION_INDEX)); }
   void set_module(JSModule* module) { set(EXTENSION_INDEX, module); }
 
   // Get the context where var declarations will be hoisted to, which
   // may be the context itself.
   Context* declaration_context();
+  bool is_declaration_context();
 
   GlobalObject* global_object() {
     Object* result = get(GLOBAL_OBJECT_INDEX);
     DCHECK(IsBootstrappingOrGlobalObject(this->GetIsolate(), result));
     return reinterpret_cast<GlobalObject*>(result);
   }
   void set_global_object(GlobalObject* object) {
     set(GLOBAL_OBJECT_INDEX, object);
   }
 
@@ skipping 156 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_