Reland "In-object double fields unboxing (for 64-bit only)."

src/heap/objects-visiting.cc

 // Copyright 2011 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.
 
 #include "src/v8.h"
 
 #include "src/heap/objects-visiting.h"
 
 namespace v8 {
 namespace internal {
 
 
 StaticVisitorBase::VisitorId StaticVisitorBase::GetVisitorId(
-    int instance_type, int instance_size) {
+    int instance_type, int instance_size, bool has_unboxed_fields) {
   if (instance_type < FIRST_NONSTRING_TYPE) {
     switch (instance_type & kStringRepresentationMask) {
       case kSeqStringTag:
         if ((instance_type & kStringEncodingMask) == kOneByteStringTag) {
           return kVisitSeqOneByteString;
         } else {
           return kVisitSeqTwoByteString;
         }
 
       case kConsStringTag:
         if (IsShortcutCandidate(instance_type)) {
           return kVisitShortcutCandidate;
         } else {
           return kVisitConsString;
         }
 
       case kSlicedStringTag:
         return kVisitSlicedString;
 
       case kExternalStringTag:
         return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
-                                   instance_size);
+                                   instance_size, has_unboxed_fields);
     }
     UNREACHABLE();
   }
 
   switch (instance_type) {
     case BYTE_ARRAY_TYPE:
       return kVisitByteArray;
 
     case FREE_SPACE_TYPE:
       return kVisitFreeSpace;
@@ skipping 20 matching lines @@
       return kVisitCell;
 
     case PROPERTY_CELL_TYPE:
       return kVisitPropertyCell;
 
     case WEAK_CELL_TYPE:
       return kVisitWeakCell;
 
     case JS_SET_TYPE:
       return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
-                                 JSSet::kSize);
+                                 JSSet::kSize, has_unboxed_fields);
 
     case JS_MAP_TYPE:
       return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
-                                 JSMap::kSize);
+                                 JSMap::kSize, has_unboxed_fields);
 
     case JS_WEAK_MAP_TYPE:
     case JS_WEAK_SET_TYPE:
       return kVisitJSWeakCollection;
 
     case JS_REGEXP_TYPE:
       return kVisitJSRegExp;
 
     case SHARED_FUNCTION_INFO_TYPE:
       return kVisitSharedFunctionInfo;
 
     case JS_PROXY_TYPE:
       return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
-                                 JSProxy::kSize);
+                                 JSProxy::kSize, has_unboxed_fields);
 
     case JS_FUNCTION_PROXY_TYPE:
       return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
-                                 JSFunctionProxy::kSize);
+                                 JSFunctionProxy::kSize, has_unboxed_fields);
 
     case FOREIGN_TYPE:
       return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
-                                 Foreign::kSize);
+                                 Foreign::kSize, has_unboxed_fields);
 
     case SYMBOL_TYPE:
       return kVisitSymbol;
 
     case FILLER_TYPE:
       return kVisitDataObjectGeneric;
 
     case JS_ARRAY_BUFFER_TYPE:
       return kVisitJSArrayBuffer;
 
@@ skipping 10 matching lines @@
     case JS_VALUE_TYPE:
     case JS_DATE_TYPE:
     case JS_ARRAY_TYPE:
     case JS_GLOBAL_PROXY_TYPE:
     case JS_GLOBAL_OBJECT_TYPE:
     case JS_BUILTINS_OBJECT_TYPE:
     case JS_MESSAGE_OBJECT_TYPE:
     case JS_SET_ITERATOR_TYPE:
     case JS_MAP_ITERATOR_TYPE:
       return GetVisitorIdForSize(kVisitJSObject, kVisitJSObjectGeneric,
-                                 instance_size);
+                                 instance_size, has_unboxed_fields);
 
     case JS_FUNCTION_TYPE:
       return kVisitJSFunction;
 
     case HEAP_NUMBER_TYPE:
     case MUTABLE_HEAP_NUMBER_TYPE:
 #define EXTERNAL_ARRAY_CASE(Type, type, TYPE, ctype, size) \
   case EXTERNAL_##TYPE##_ARRAY_TYPE:
 
       TYPED_ARRAYS(EXTERNAL_ARRAY_CASE)
       return GetVisitorIdForSize(kVisitDataObject, kVisitDataObjectGeneric,
-                                 instance_size);
+                                 instance_size, has_unboxed_fields);
 #undef EXTERNAL_ARRAY_CASE
 
     case FIXED_UINT8_ARRAY_TYPE:
     case FIXED_INT8_ARRAY_TYPE:
     case FIXED_UINT16_ARRAY_TYPE:
     case FIXED_INT16_ARRAY_TYPE:
     case FIXED_UINT32_ARRAY_TYPE:
     case FIXED_INT32_ARRAY_TYPE:
     case FIXED_FLOAT32_ARRAY_TYPE:
     case FIXED_UINT8_CLAMPED_ARRAY_TYPE:
       return kVisitFixedTypedArray;
 
     case FIXED_FLOAT64_ARRAY_TYPE:
       return kVisitFixedFloat64Array;
 
 #define MAKE_STRUCT_CASE(NAME, Name, name) case NAME##_TYPE:
       STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
       if (instance_type == ALLOCATION_SITE_TYPE) {
         return kVisitAllocationSite;
       }
 
       return GetVisitorIdForSize(kVisitStruct, kVisitStructGeneric,
-                                 instance_size);
+                                 instance_size, has_unboxed_fields);
 
     default:
       UNREACHABLE();
       return kVisitorIdCount;
   }
 }
 
 
 // We don't record weak slots during marking or scavenges. Instead we do it
 // once when we complete mark-compact cycle.  Note that write barrier has no
@@ skipping 226 matching lines @@
 
 
 template Object* VisitWeakList<JSArrayBuffer>(Heap* heap, Object* list,
                                               WeakObjectRetainer* retainer);
 
 
 template Object* VisitWeakList<AllocationSite>(Heap* heap, Object* list,
                                                WeakObjectRetainer* retainer);
 }
 }  // namespace v8::internal