Introduce LanguageMode, drop StrictMode.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1103 matching lines @@
 
   // Converts this to a Smi if possible.
   static MUST_USE_RESULT inline MaybeHandle<Smi> ToSmi(Isolate* isolate,
                                                        Handle<Object> object);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetProperty(LookupIterator* it);
 
   // Implementation of [[Put]], ECMA-262 5th edition, section 8.12.5.
   MUST_USE_RESULT static MaybeHandle<Object> SetProperty(
       Handle<Object> object, Handle<Name> key, Handle<Object> value,
-      StrictMode strict_mode,
+      LanguageMode language_mode,
       StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetProperty(
-      LookupIterator* it, Handle<Object> value, StrictMode strict_mode,
+      LookupIterator* it, Handle<Object> value, LanguageMode language_mode,
       StoreFromKeyed store_mode,
       StorePropertyMode data_store_mode = NORMAL_PROPERTY);
   MUST_USE_RESULT static MaybeHandle<Object> WriteToReadOnlyProperty(
-      LookupIterator* it, Handle<Object> value, StrictMode strict_mode);
+      LookupIterator* it, Handle<Object> value, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> WriteToReadOnlyElement(
       Isolate* isolate, Handle<Object> receiver, uint32_t index,
-      Handle<Object> value, StrictMode strict_mode);
+      Handle<Object> value, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetDataProperty(
       LookupIterator* it, Handle<Object> value);
   MUST_USE_RESULT static MaybeHandle<Object> AddDataProperty(
       LookupIterator* it, Handle<Object> value, PropertyAttributes attributes,
-      StrictMode strict_mode, StoreFromKeyed store_mode);
+      LanguageMode language_mode, StoreFromKeyed store_mode);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement(
       Handle<Object> object,
       Handle<Name> key);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty(
       Isolate* isolate,
       Handle<Object> object,
       const char* key);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty(
       Handle<Object> object,
       Handle<Name> key);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithAccessor(
       Handle<Object> receiver,
       Handle<Name> name,
       Handle<JSObject> holder,
       Handle<Object> structure);
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithAccessor(
       Handle<Object> receiver, Handle<Name> name, Handle<Object> value,
       Handle<JSObject> holder, Handle<Object> structure,
-      StrictMode strict_mode);
+      LanguageMode language_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithDefinedGetter(
       Handle<Object> receiver,
       Handle<JSReceiver> getter);
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithDefinedSetter(
       Handle<Object> receiver,
       Handle<JSReceiver> setter,
       Handle<Object> value);
 
   MUST_USE_RESULT static inline MaybeHandle<Object> GetElement(
       Isolate* isolate,
       Handle<Object> object,
       uint32_t index);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetElementWithReceiver(
       Isolate* isolate,
       Handle<Object> object,
       Handle<Object> receiver,
       uint32_t index);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetElementWithReceiver(
       Isolate* isolate, Handle<Object> object, Handle<Object> receiver,
-      uint32_t index, Handle<Object> value, StrictMode strict_mode);
+      uint32_t index, Handle<Object> value, LanguageMode language_mode);
 
   static inline Handle<Object> GetPrototypeSkipHiddenPrototypes(
       Isolate* isolate, Handle<Object> receiver);
 
   // Returns the permanent hash code associated with this object. May return
   // undefined if not yet created.
   Object* GetHash();
 
   // Returns the permanent hash code associated with this object depending on
   // the actual object type. May create and store a hash code if needed and none
@@ skipping 391 matching lines @@
 };
 
 
 // JSReceiver includes types on which properties can be defined, i.e.,
 // JSObject and JSProxy.
 class JSReceiver: public HeapObject {
  public:
   DECLARE_CAST(JSReceiver)
 
   MUST_USE_RESULT static MaybeHandle<Object> SetElement(
-      Handle<JSReceiver> object,
-      uint32_t index,
-      Handle<Object> value,
-      PropertyAttributes attributes,
-      StrictMode strict_mode);
+      Handle<JSReceiver> object, uint32_t index, Handle<Object> value,
+      PropertyAttributes attributes, LanguageMode language_mode);
 
   // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6.
   MUST_USE_RESULT static inline Maybe<bool> HasProperty(
       Handle<JSReceiver> object, Handle<Name> name);
   MUST_USE_RESULT static inline Maybe<bool> HasOwnProperty(Handle<JSReceiver>,
                                                            Handle<Name> name);
   MUST_USE_RESULT static inline Maybe<bool> HasElement(
       Handle<JSReceiver> object, uint32_t index);
   MUST_USE_RESULT static inline Maybe<bool> HasOwnElement(
       Handle<JSReceiver> object, uint32_t index);
 
   // Implementation of [[Delete]], ECMA-262 5th edition, section 8.12.7.
   MUST_USE_RESULT static MaybeHandle<Object> DeleteProperty(
       Handle<JSReceiver> object, Handle<Name> name,
-      StrictMode strict_mode = SLOPPY);
+      LanguageMode language_mode = SLOPPY);
   MUST_USE_RESULT static MaybeHandle<Object> DeleteElement(
       Handle<JSReceiver> object, uint32_t index,
-      StrictMode strict_mode = SLOPPY);
+      LanguageMode language_mode = SLOPPY);
 
   // Tests for the fast common case for property enumeration.
   bool IsSimpleEnum();
 
   // Returns the class name ([[Class]] property in the specification).
   String* class_name();
 
   // Returns the constructor name (the name (possibly, inferred name) of the
   // function that was used to instantiate the object).
   String* constructor_name();
@@ skipping 297 matching lines @@
   static int NewElementsCapacity(int old_capacity) {
     // (old_capacity + 50%) + 16
     return old_capacity + (old_capacity >> 1) + 16;
   }
 
   // These methods do not perform access checks!
   MUST_USE_RESULT static MaybeHandle<AccessorPair> GetOwnElementAccessorPair(
       Handle<JSObject> object, uint32_t index);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetFastElement(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      StrictMode strict_mode,
-      bool check_prototype);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      LanguageMode language_mode, bool check_prototype);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetOwnElement(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      StrictMode strict_mode);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      LanguageMode language_mode);
 
   // Empty handle is returned if the element cannot be set to the given value.
   MUST_USE_RESULT static MaybeHandle<Object> SetElement(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      PropertyAttributes attributes,
-      StrictMode strict_mode,
-      bool check_prototype = true,
-      SetPropertyMode set_mode = SET_PROPERTY);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      PropertyAttributes attributes, LanguageMode language_mode,
+      bool check_prototype = true, SetPropertyMode set_mode = SET_PROPERTY);
 
   // Returns the index'th element.
   // The undefined object if index is out of bounds.
   MUST_USE_RESULT static MaybeHandle<Object> GetElementWithInterceptor(
       Handle<JSObject> object,
       Handle<Object> receiver,
       uint32_t index);
 
   enum SetFastElementsCapacitySmiMode {
     kAllowSmiElements,
@@ skipping 311 matching lines @@
                                          Handle<Object> receiver,
                                          uint32_t index);
 
   MUST_USE_RESULT static Maybe<PropertyAttributes>
       GetElementAttributeWithoutInterceptor(Handle<JSObject> object,
                                             Handle<JSReceiver> receiver,
                                             uint32_t index,
                                             bool continue_search);
   MUST_USE_RESULT static MaybeHandle<Object> SetElementWithCallback(
       Handle<Object> object, Handle<Object> structure, uint32_t index,
-      Handle<Object> value, Handle<JSObject> holder, StrictMode strict_mode);
+      Handle<Object> value, Handle<JSObject> holder,
+      LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetElementWithInterceptor(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      PropertyAttributes attributes,
-      StrictMode strict_mode,
-      bool check_prototype,
-      SetPropertyMode set_mode);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      PropertyAttributes attributes, LanguageMode language_mode,
+      bool check_prototype, SetPropertyMode set_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetElementWithoutInterceptor(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      PropertyAttributes attributes,
-      StrictMode strict_mode,
-      bool check_prototype,
-      SetPropertyMode set_mode);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      PropertyAttributes attributes, LanguageMode language_mode,
+      bool check_prototype, SetPropertyMode set_mode);
   MUST_USE_RESULT
   static MaybeHandle<Object> SetElementWithCallbackSetterInPrototypes(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      bool* found,
-      StrictMode strict_mode);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      bool* found, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetDictionaryElement(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      PropertyAttributes attributes,
-      StrictMode strict_mode,
-      bool check_prototype,
-      SetPropertyMode set_mode = SET_PROPERTY);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      PropertyAttributes attributes, LanguageMode language_mode,
+      bool check_prototype, SetPropertyMode set_mode = SET_PROPERTY);
   MUST_USE_RESULT static MaybeHandle<Object> SetFastDoubleElement(
-      Handle<JSObject> object,
-      uint32_t index,
-      Handle<Object> value,
-      StrictMode strict_mode,
-      bool check_prototype = true);
+      Handle<JSObject> object, uint32_t index, Handle<Object> value,
+      LanguageMode language_mode, bool check_prototype = true);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithFailedAccessCheck(
-      LookupIterator* it, Handle<Object> value, StrictMode strict_mode);
+      LookupIterator* it, Handle<Object> value, LanguageMode language_mode);
 
   // Add a property to a slow-case object.
   static void AddSlowProperty(Handle<JSObject> object,
                               Handle<Name> name,
                               Handle<Object> value,
                               PropertyAttributes attributes);
 
   MUST_USE_RESULT static MaybeHandle<Object> DeleteProperty(
-      Handle<JSObject> object, Handle<Name> name, StrictMode strict_mode);
+      Handle<JSObject> object, Handle<Name> name, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> DeletePropertyWithInterceptor(
       Handle<JSObject> holder, Handle<JSObject> receiver, Handle<Name> name);
 
   // Deletes an existing named property in a normalized object.
   static void DeleteNormalizedProperty(Handle<JSObject> object,
                                        Handle<Name> name);
 
   MUST_USE_RESULT static MaybeHandle<Object> DeleteElement(
-      Handle<JSObject> object, uint32_t index, StrictMode strict_mode);
+      Handle<JSObject> object, uint32_t index, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> DeleteElementWithInterceptor(
       Handle<JSObject> object,
       uint32_t index);
 
   bool ReferencesObjectFromElements(FixedArray* elements,
                                     ElementsKind kind,
                                     Object* object);
 
   // Returns true if most of the elements backing storage is used.
   bool HasDenseElements();
@@ skipping 1796 matching lines @@
 class ScopeInfo : public FixedArray {
  public:
   DECLARE_CAST(ScopeInfo)
 
   // Return the type of this scope.
   ScopeType scope_type();
 
   // Does this scope call eval?
   bool CallsEval();
 
-  // Return the strict mode of this scope.
-  StrictMode strict_mode();
+  // Return the language mode of this scope.
+  LanguageMode language_mode();
 
   // Does this scope make a sloppy eval call?
-  bool CallsSloppyEval() { return CallsEval() && strict_mode() == SLOPPY; }
+  bool CallsSloppyEval() { return CallsEval() && !is_strict(language_mode()); }
 
   // Return the total number of locals allocated on the stack and in the
   // context. This includes the parameters that are allocated in the context.
   int LocalCount();
 
   // Return the number of stack slots for code. This number consists of two
   // parts:
   //  1. One stack slot per stack allocated local.
   //  2. One stack slot for the function name if it is stack allocated.
   int StackSlotCount();
@@ skipping 166 matching lines @@
   enum FunctionVariableInfo {
     NONE,     // No function name present.
     STACK,    // Function
     CONTEXT,
     UNUSED
   };
 
   // Properties of scopes.
   class ScopeTypeField : public BitField<ScopeType, 0, 4> {};
   class CallsEvalField : public BitField<bool, 4, 1> {};
-  class StrictModeField : public BitField<StrictMode, 5, 1> {};
+  STATIC_ASSERT(LANGUAGE_END == 2);
+  class LanguageModeField : public BitField<LanguageMode, 5, 1> {};
   class FunctionVariableField : public BitField<FunctionVariableInfo, 6, 2> {};
   class FunctionVariableMode : public BitField<VariableMode, 8, 3> {};
   class AsmModuleField : public BitField<bool, 11, 1> {};
   class AsmFunctionField : public BitField<bool, 12, 1> {};
 
   // BitFields representing the encoded information for context locals in the
   // ContextLocalInfoEntries part.
   class ContextLocalMode:      public BitField<VariableMode,         0, 3> {};
   class ContextLocalInitFlag:  public BitField<InitializationFlag,   3, 1> {};
   class ContextLocalMaybeAssignedFlag
@@ skipping 2536 matching lines @@
   // iteration by the debugger).
   DECL_BOOLEAN_ACCESSORS(allows_lazy_compilation_without_context)
 
   // Indicates whether optimizations have been disabled for this
   // shared function info. If a function is repeatedly optimized or if
   // we cannot optimize the function we disable optimization to avoid
   // spending time attempting to optimize it again.
   DECL_BOOLEAN_ACCESSORS(optimization_disabled)
 
   // Indicates the language mode.
-  inline StrictMode strict_mode();
-  inline void set_strict_mode(StrictMode strict_mode);
+  inline LanguageMode language_mode();
+  inline void set_language_mode(LanguageMode language_mode);
 
   // False if the function definitely does not allocate an arguments object.
   DECL_BOOLEAN_ACCESSORS(uses_arguments)
 
   // Indicates that this function uses a super property.
   // This is needed to set up the [[HomeObject]] on the function instance.
   DECL_BOOLEAN_ACCESSORS(uses_super_property)
 
   // Indicates that this function uses the super constructor.
   DECL_BOOLEAN_ACCESSORS(uses_super_constructor_call)
@@ skipping 287 matching lines @@
     kDontCache,
     kDontFlush,
     kIsArrow,
     kIsGenerator,
     kIsConciseMethod,
     kIsDefaultConstructor,
     kIsAsmFunction,
     kDeserialized,
     kCompilerHintsCount  // Pseudo entry
   };
+  // Add hints for other modes when they're added.
+  STATIC_ASSERT(LANGUAGE_END == 2);
 
   class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 4> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};
   class ICAgeBits : public BitField<int, 22, 8> {};
 
   class OptCountBits : public BitField<int, 0, 22> {};
   class DisabledOptimizationReasonBits : public BitField<int, 22, 8> {};
 
@@ skipping 839 matching lines @@
 // recompilation stub, or to "old" code. This avoids memory leaks due to
 // premature caching of scripts and eval strings that are never needed later.
 class CompilationCacheTable: public HashTable<CompilationCacheTable,
                                               CompilationCacheShape,
                                               HashTableKey*> {
  public:
   // Find cached value for a string key, otherwise return null.
   Handle<Object> Lookup(Handle<String> src, Handle<Context> context);
   Handle<Object> LookupEval(Handle<String> src,
                             Handle<SharedFunctionInfo> shared,
-                            StrictMode strict_mode, int scope_position);
+                            LanguageMode language_mode, int scope_position);
   Handle<Object> LookupRegExp(Handle<String> source, JSRegExp::Flags flags);
   static Handle<CompilationCacheTable> Put(
       Handle<CompilationCacheTable> cache, Handle<String> src,
       Handle<Context> context, Handle<Object> value);
   static Handle<CompilationCacheTable> PutEval(
       Handle<CompilationCacheTable> cache, Handle<String> src,
       Handle<SharedFunctionInfo> context, Handle<SharedFunctionInfo> value,
       int scope_position);
   static Handle<CompilationCacheTable> PutRegExp(
       Handle<CompilationCacheTable> cache, Handle<String> src,
@@ skipping 1718 matching lines @@
       Handle<Object> receiver,
       uint32_t index);
 
   // If the handler defines an accessor property with a setter, invoke it.
   // If it defines an accessor property without a setter, or a data property
   // that is read-only, throw. In all these cases set '*done' to true,
   // otherwise set it to false.
   MUST_USE_RESULT
   static MaybeHandle<Object> SetPropertyViaPrototypesWithHandler(
       Handle<JSProxy> proxy, Handle<Object> receiver, Handle<Name> name,
-      Handle<Object> value, StrictMode strict_mode, bool* done);
+      Handle<Object> value, LanguageMode language_mode, bool* done);
 
   MUST_USE_RESULT static Maybe<PropertyAttributes>
       GetPropertyAttributesWithHandler(Handle<JSProxy> proxy,
                                        Handle<Object> receiver,
                                        Handle<Name> name);
   MUST_USE_RESULT static Maybe<PropertyAttributes>
       GetElementAttributeWithHandler(Handle<JSProxy> proxy,
                                      Handle<JSReceiver> receiver,
                                      uint32_t index);
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithHandler(
       Handle<JSProxy> proxy, Handle<Object> receiver, Handle<Name> name,
-      Handle<Object> value, StrictMode strict_mode);
+      Handle<Object> value, LanguageMode language_mode);
 
   // Turn the proxy into an (empty) JSObject.
   static void Fix(Handle<JSProxy> proxy);
 
   // Initializes the body after the handler slot.
   inline void InitializeBody(int object_size, Object* value);
 
   // Invoke a trap by name. If the trap does not exist on this's handler,
   // but derived_trap is non-NULL, invoke that instead.  May cause GC.
   MUST_USE_RESULT static MaybeHandle<Object> CallTrap(
@@ skipping 20 matching lines @@
   STATIC_ASSERT(kPaddingSize >= 0);
 
   typedef FixedBodyDescriptor<kHandlerOffset,
                               kPaddingOffset,
                               kSize> BodyDescriptor;
 
  private:
   friend class JSReceiver;
 
   MUST_USE_RESULT static inline MaybeHandle<Object> SetElementWithHandler(
-      Handle<JSProxy> proxy,
-      Handle<JSReceiver> receiver,
-      uint32_t index,
-      Handle<Object> value,
-      StrictMode strict_mode);
+      Handle<JSProxy> proxy, Handle<JSReceiver> receiver, uint32_t index,
+      Handle<Object> value, LanguageMode language_mode);
 
   MUST_USE_RESULT static Maybe<bool> HasPropertyWithHandler(
       Handle<JSProxy> proxy, Handle<Name> name);
   MUST_USE_RESULT static inline Maybe<bool> HasElementWithHandler(
       Handle<JSProxy> proxy, uint32_t index);
 
   MUST_USE_RESULT static MaybeHandle<Object> DeletePropertyWithHandler(
-      Handle<JSProxy> proxy, Handle<Name> name, StrictMode strict_mode);
+      Handle<JSProxy> proxy, Handle<Name> name, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> DeleteElementWithHandler(
-      Handle<JSProxy> proxy, uint32_t index, StrictMode strict_mode);
+      Handle<JSProxy> proxy, uint32_t index, LanguageMode language_mode);
 
   MUST_USE_RESULT Object* GetIdentityHash();
 
   static Handle<Smi> GetOrCreateIdentityHash(Handle<JSProxy> proxy);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSProxy);
 };
 
 
 class JSFunctionProxy: public JSProxy {
@@ skipping 1077 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_