Combine typed and pixel arrays.

src/objects.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 942 matching lines @@
   switch (map()->instance_type()) {
     case MAP_TYPE:
       accumulator->Add("<Map>");
       break;
     case FIXED_ARRAY_TYPE:
       accumulator->Add("<FixedArray[%u]>", FixedArray::cast(this)->length());
       break;
     case BYTE_ARRAY_TYPE:
       accumulator->Add("<ByteArray[%u]>", ByteArray::cast(this)->length());
       break;
-    case PIXEL_ARRAY_TYPE:
-      accumulator->Add("<PixelArray[%u]>", PixelArray::cast(this)->length());
+    case EXTERNAL_PIXEL_ARRAY_TYPE:
+      accumulator->Add("<ExternalPixelArray[%u]>",
+                       ExternalPixelArray::cast(this)->length());
       break;
     case EXTERNAL_BYTE_ARRAY_TYPE:
       accumulator->Add("<ExternalByteArray[%u]>",
                        ExternalByteArray::cast(this)->length());
       break;
     case EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE:
       accumulator->Add("<ExternalUnsignedByteArray[%u]>",
                        ExternalUnsignedByteArray::cast(this)->length());
       break;
     case EXTERNAL_SHORT_ARRAY_TYPE:
@@ skipping 130 matching lines @@
       break;
     case CODE_TYPE:
       reinterpret_cast<Code*>(this)->CodeIterateBody(v);
       break;
     case JS_GLOBAL_PROPERTY_CELL_TYPE:
       JSGlobalPropertyCell::BodyDescriptor::IterateBody(this, v);
       break;
     case HEAP_NUMBER_TYPE:
     case FILLER_TYPE:
     case BYTE_ARRAY_TYPE:
-    case PIXEL_ARRAY_TYPE:
+    case EXTERNAL_PIXEL_ARRAY_TYPE:
     case EXTERNAL_BYTE_ARRAY_TYPE:
     case EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE:
     case EXTERNAL_SHORT_ARRAY_TYPE:
     case EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE:
     case EXTERNAL_INT_ARRAY_TYPE:
     case EXTERNAL_UNSIGNED_INT_ARRAY_TYPE:
     case EXTERNAL_FLOAT_ARRAY_TYPE:
       break;
     case SHARED_FUNCTION_INFO_TYPE:
       SharedFunctionInfo::BodyDescriptor::IterateBody(this, v);
@@ skipping 1286 matching lines @@
 
 MaybeObject* JSObject::TransformToFastProperties(int unused_property_fields) {
   if (HasFastProperties()) return this;
   ASSERT(!IsGlobalObject());
   return property_dictionary()->
       TransformPropertiesToFastFor(this, unused_property_fields);
 }
 
 
 MaybeObject* JSObject::NormalizeElements() {
-  ASSERT(!HasPixelElements() && !HasExternalArrayElements());
+  ASSERT(!HasExternalArrayElements());
   if (HasDictionaryElements()) return this;
   ASSERT(map()->has_fast_elements());
 
   Object* obj;
   { MaybeObject* maybe_obj = map()->GetSlowElementsMap();
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
   Map* new_map = Map::cast(obj);
 
   // Get number of entries.
@@ skipping 81 matching lines @@
   }
   MaybeObject* raw_result =
       this_handle->DeletePropertyPostInterceptor(*name_handle, NORMAL_DELETION);
   RETURN_IF_SCHEDULED_EXCEPTION();
   return raw_result;
 }
 
 
 MaybeObject* JSObject::DeleteElementPostInterceptor(uint32_t index,
                                                     DeleteMode mode) {
-  ASSERT(!HasPixelElements() && !HasExternalArrayElements());
+  ASSERT(!HasExternalArrayElements());
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       Object* obj;
       { MaybeObject* maybe_obj = EnsureWritableFastElements();
         if (!maybe_obj->ToObject(&obj)) return maybe_obj;
       }
       uint32_t length = IsJSArray() ?
       static_cast<uint32_t>(Smi::cast(JSArray::cast(this)->length())->value()) :
       static_cast<uint32_t>(FixedArray::cast(elements())->length());
       if (index < length) {
@@ skipping 78 matching lines @@
         if (!maybe_obj->ToObject(&obj)) return maybe_obj;
       }
       uint32_t length = IsJSArray() ?
       static_cast<uint32_t>(Smi::cast(JSArray::cast(this)->length())->value()) :
       static_cast<uint32_t>(FixedArray::cast(elements())->length());
       if (index < length) {
         FixedArray::cast(elements())->set_the_hole(index);
       }
       break;
     }
-    case PIXEL_ELEMENTS:
+    case EXTERNAL_PIXEL_ELEMENTS:
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS:
       // Pixel and external array elements cannot be deleted. Just
       // silently ignore here.
       break;
@@ skipping 94 matching lines @@
   }
 
   // Check if the object is among the named properties.
   Object* key = SlowReverseLookup(obj);
   if (key != Heap::undefined_value()) {
     return true;
   }
 
   // Check if the object is among the indexed properties.
   switch (GetElementsKind()) {
-    case PIXEL_ELEMENTS:
+    case EXTERNAL_PIXEL_ELEMENTS:
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS:
       // Raw pixels and external arrays do not reference other
       // objects.
       break;
@@ skipping 233 matching lines @@
     return Heap::undefined_value();
   }
 
   uint32_t index = 0;
   bool is_element = name->AsArrayIndex(&index);
 
   if (is_element) {
     switch (GetElementsKind()) {
       case FAST_ELEMENTS:
         break;
-      case PIXEL_ELEMENTS:
+      case EXTERNAL_PIXEL_ELEMENTS:
       case EXTERNAL_BYTE_ELEMENTS:
       case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
       case EXTERNAL_SHORT_ELEMENTS:
       case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
       case EXTERNAL_INT_ELEMENTS:
       case EXTERNAL_UNSIGNED_INT_ELEMENTS:
       case EXTERNAL_FLOAT_ELEMENTS:
         // Ignore getters and setters on pixel and external array
         // elements.
         return Heap::undefined_value();
@@ skipping 203 matching lines @@
   uint32_t index = 0;
   bool is_element = name->AsArrayIndex(&index);
 
   if (is_element) {
     if (IsJSArray()) return Heap::undefined_value();
 
     // Accessors overwrite previous callbacks (cf. with getters/setters).
     switch (GetElementsKind()) {
       case FAST_ELEMENTS:
         break;
-      case PIXEL_ELEMENTS:
+      case EXTERNAL_PIXEL_ELEMENTS:
       case EXTERNAL_BYTE_ELEMENTS:
       case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
       case EXTERNAL_SHORT_ELEMENTS:
       case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
       case EXTERNAL_INT_ELEMENTS:
       case EXTERNAL_UNSIGNED_INT_ELEMENTS:
       case EXTERNAL_FLOAT_ELEMENTS:
         // Ignore getters and setters on pixel and external array
         // elements.
         return Heap::undefined_value();
@@ skipping 560 matching lines @@
     if (element->IsString() &&
         key->IsString() && String::cast(element)->Equals(String::cast(key))) {
       return true;
     }
   }
   return false;
 }
 
 
 MaybeObject* FixedArray::AddKeysFromJSArray(JSArray* array) {
-  ASSERT(!array->HasPixelElements() && !array->HasExternalArrayElements());
+  ASSERT(!array->HasExternalArrayElements());
   switch (array->GetElementsKind()) {
     case JSObject::FAST_ELEMENTS:
       return UnionOfKeys(FixedArray::cast(array->elements()));
     case JSObject::DICTIONARY_ELEMENTS: {
       NumberDictionary* dict = array->element_dictionary();
       int size = dict->NumberOfElements();
 
       // Allocate a temporary fixed array.
       Object* object;
       { MaybeObject* maybe_object = Heap::AllocateFixedArray(size);
@@ skipping 2411 matching lines @@
 
 // Identify kind of code.
 const char* Code::Kind2String(Kind kind) {
   switch (kind) {
     case FUNCTION: return "FUNCTION";
     case OPTIMIZED_FUNCTION: return "OPTIMIZED_FUNCTION";
     case STUB: return "STUB";
     case BUILTIN: return "BUILTIN";
     case LOAD_IC: return "LOAD_IC";
     case KEYED_LOAD_IC: return "KEYED_LOAD_IC";
+    case KEYED_EXTERNAL_ARRAY_LOAD_IC: return "KEYED_EXTERNAL_ARRAY_LOAD_IC";
     case STORE_IC: return "STORE_IC";
     case KEYED_STORE_IC: return "KEYED_STORE_IC";
+    case KEYED_EXTERNAL_ARRAY_STORE_IC: return "KEYED_EXTERNAL_ARRAY_STORE_IC";
     case CALL_IC: return "CALL_IC";
     case KEYED_CALL_IC: return "KEYED_CALL_IC";
     case BINARY_OP_IC: return "BINARY_OP_IC";
     case TYPE_RECORDING_BINARY_OP_IC: return "TYPE_RECORDING_BINARY_OP_IC";
     case COMPARE_IC: return "COMPARE_IC";
   }
   UNREACHABLE();
   return NULL;
 }
 
@@ skipping 128 matching lines @@
   PrintF("RelocInfo (size = %d)\n", relocation_size());
   for (RelocIterator it(this); !it.done(); it.next()) it.rinfo()->Print(out);
   PrintF(out, "\n");
 }
 #endif  // ENABLE_DISASSEMBLER
 
 
 MaybeObject* JSObject::SetFastElementsCapacityAndLength(int capacity,
                                                         int length) {
   // We should never end in here with a pixel or external array.
-  ASSERT(!HasPixelElements() && !HasExternalArrayElements());
+  ASSERT(!HasExternalArrayElements());
 
   Object* obj;
   { MaybeObject* maybe_obj = Heap::AllocateFixedArrayWithHoles(capacity);
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
   FixedArray* elems = FixedArray::cast(obj);
 
   { MaybeObject* maybe_obj = map()->GetFastElementsMap();
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
@@ skipping 33 matching lines @@
   if (IsJSArray()) {
     JSArray::cast(this)->set_length(Smi::FromInt(length));
   }
 
   return this;
 }
 
 
 MaybeObject* JSObject::SetSlowElements(Object* len) {
   // We should never end in here with a pixel or external array.
-  ASSERT(!HasPixelElements() && !HasExternalArrayElements());
+  ASSERT(!HasExternalArrayElements());
 
   uint32_t new_length = static_cast<uint32_t>(len->Number());
 
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       // Make sure we never try to shrink dense arrays into sparse arrays.
       ASSERT(static_cast<uint32_t>(FixedArray::cast(elements())->length()) <=
                                    new_length);
       Object* obj;
       { MaybeObject* maybe_obj = NormalizeElements();
@@ skipping 208 matching lines @@
       uint32_t length = IsJSArray() ?
           static_cast<uint32_t>
               (Smi::cast(JSArray::cast(this)->length())->value()) :
           static_cast<uint32_t>(FixedArray::cast(elements())->length());
       if ((index < length) &&
           !FixedArray::cast(elements())->get(index)->IsTheHole()) {
         return true;
       }
       break;
     }
-    case PIXEL_ELEMENTS: {
+    case EXTERNAL_PIXEL_ELEMENTS: {
       // TODO(iposva): Add testcase.
-      PixelArray* pixels = PixelArray::cast(elements());
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) {
         return true;
       }
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
@@ skipping 98 matching lines @@
       uint32_t length = IsJSArray() ?
           static_cast<uint32_t>
               (Smi::cast(JSArray::cast(this)->length())->value()) :
           static_cast<uint32_t>(FixedArray::cast(elements())->length());
       if ((index < length) &&
           !FixedArray::cast(elements())->get(index)->IsTheHole()) {
         return FAST_ELEMENT;
       }
       break;
     }
-    case PIXEL_ELEMENTS: {
-      PixelArray* pixels = PixelArray::cast(elements());
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) return FAST_ELEMENT;
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
@@ skipping 33 matching lines @@
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       uint32_t length = IsJSArray() ?
           static_cast<uint32_t>
               (Smi::cast(JSArray::cast(this)->length())->value()) :
           static_cast<uint32_t>(FixedArray::cast(elements())->length());
       if ((index < length) &&
           !FixedArray::cast(elements())->get(index)->IsTheHole()) return true;
       break;
     }
-    case PIXEL_ELEMENTS: {
-      PixelArray* pixels = PixelArray::cast(elements());
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) {
         return true;
       }
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
@@ skipping 255 matching lines @@
 }
 
 
 MaybeObject* JSObject::SetElementWithoutInterceptor(uint32_t index,
                                                     Object* value,
                                                     bool check_prototype) {
   switch (GetElementsKind()) {
     case FAST_ELEMENTS:
       // Fast case.
       return SetFastElement(index, value, check_prototype);
-    case PIXEL_ELEMENTS: {
-      PixelArray* pixels = PixelArray::cast(elements());
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       return pixels->SetValue(index, value);
     }
     case EXTERNAL_BYTE_ELEMENTS: {
       ExternalByteArray* array = ExternalByteArray::cast(elements());
       return array->SetValue(index, value);
     }
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS: {
       ExternalUnsignedByteArray* array =
           ExternalUnsignedByteArray::cast(elements());
       return array->SetValue(index, value);
@@ skipping 131 matching lines @@
   // JSArray::length cannot change.
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       FixedArray* elms = FixedArray::cast(elements());
       if (index < static_cast<uint32_t>(elms->length())) {
         Object* value = elms->get(index);
         if (!value->IsTheHole()) return value;
       }
       break;
     }
-    case PIXEL_ELEMENTS: {
+    case EXTERNAL_PIXEL_ELEMENTS: {
       // TODO(iposva): Add testcase and implement.

[Mads Ager (chromium), 2011/02/21 13:32:27]

Scary. We should do this.

       UNIMPLEMENTED();
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
       // TODO(kbr): Add testcase and implement.

[Mads Ager (chromium), 2011/02/21 13:32:27]

Scary. We should do this.

       UNIMPLEMENTED();
       break;
     }
     case DICTIONARY_ELEMENTS: {
       NumberDictionary* dictionary = element_dictionary();
       int entry = dictionary->FindEntry(index);
       if (entry != NumberDictionary::kNotFound) {
         Object* element = dictionary->ValueAt(entry);
         PropertyDetails details = dictionary->DetailsAt(entry);
         if (details.type() == CALLBACKS) {
@@ skipping 68 matching lines @@
   // JSArray::length cannot change.
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       FixedArray* elms = FixedArray::cast(elements());
       if (index < static_cast<uint32_t>(elms->length())) {
         Object* value = elms->get(index);
         if (!value->IsTheHole()) return value;
       }
       break;
     }
-    case PIXEL_ELEMENTS: {
-      PixelArray* pixels = PixelArray::cast(elements());
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       if (index < static_cast<uint32_t>(pixels->length())) {
         uint8_t value = pixels->get(index);
         return Smi::FromInt(value);
       }
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS: {
       ExternalByteArray* array = ExternalByteArray::cast(elements());
       if (index < static_cast<uint32_t>(array->length())) {
         int8_t value = array->get(index);
@@ skipping 82 matching lines @@
 
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       FixedArray* elms = FixedArray::cast(elements());
       capacity = elms->length();
       for (int i = 0; i < capacity; i++) {
         if (!elms->get(i)->IsTheHole()) number_of_elements++;
       }
       break;
     }
-    case PIXEL_ELEMENTS:
+    case EXTERNAL_PIXEL_ELEMENTS:
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
       return true;
     }
     case DICTIONARY_ELEMENTS: {
@@ skipping 207 matching lines @@
 
   switch (GetElementsKind()) {
     case FAST_ELEMENTS: {
       uint32_t length = IsJSArray() ?
           static_cast<uint32_t>(
               Smi::cast(JSArray::cast(this)->length())->value()) :
           static_cast<uint32_t>(FixedArray::cast(elements())->length());
       return (index < length) &&
           !FixedArray::cast(elements())->get(index)->IsTheHole();
     }
-    case PIXEL_ELEMENTS: {
-      PixelArray* pixels = PixelArray::cast(elements());
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      ExternalPixelArray* pixels = ExternalPixelArray::cast(elements());
       return index < static_cast<uint32_t>(pixels->length());
     }
     case EXTERNAL_BYTE_ELEMENTS:
     case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_SHORT_ELEMENTS:
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
     case EXTERNAL_INT_ELEMENTS:
     case EXTERNAL_UNSIGNED_INT_ELEMENTS:
     case EXTERNAL_FLOAT_ELEMENTS: {
       ExternalArray* array = ExternalArray::cast(elements());
@@ skipping 210 matching lines @@
         if (!FixedArray::cast(elements())->get(i)->IsTheHole()) {
           if (storage != NULL) {
             storage->set(counter, Smi::FromInt(i));
           }
           counter++;
         }
       }
       ASSERT(!storage || storage->length() >= counter);
       break;
     }
-    case PIXEL_ELEMENTS: {
-      int length = PixelArray::cast(elements())->length();
+    case EXTERNAL_PIXEL_ELEMENTS: {
+      int length = ExternalPixelArray::cast(elements())->length();
       while (counter < length) {
         if (storage != NULL) {
           storage->set(counter, Smi::FromInt(counter));
         }
         counter++;
       }
       ASSERT(!storage || storage->length() >= counter);
       break;
     }
     case EXTERNAL_BYTE_ELEMENTS:
@@ skipping 720 matching lines @@
   result_double->set_value(static_cast<double>(result));
   return result_double;
 }
 
 
 // Collects all defined (non-hole) and non-undefined (array) elements at
 // the start of the elements array.
 // If the object is in dictionary mode, it is converted to fast elements
 // mode.
 MaybeObject* JSObject::PrepareElementsForSort(uint32_t limit) {
-  ASSERT(!HasPixelElements() && !HasExternalArrayElements());
+  ASSERT(!HasExternalArrayElements());
 
   if (HasDictionaryElements()) {
     // Convert to fast elements containing only the existing properties.
     // Ordering is irrelevant, since we are going to sort anyway.
     NumberDictionary* dict = element_dictionary();
     if (IsJSArray() || dict->requires_slow_elements() ||
         dict->max_number_key() >= limit) {
       return PrepareSlowElementsForSort(limit);
     }
     // Convert to fast elements.
@@ skipping 91 matching lines @@
 
   if (result <= static_cast<uint32_t>(Smi::kMaxValue)) {
     return Smi::FromInt(static_cast<int>(result));
   }
   ASSERT_NE(NULL, result_double);
   result_double->set_value(static_cast<double>(result));
   return result_double;
 }
 
 
-Object* PixelArray::SetValue(uint32_t index, Object* value) {
+Object* ExternalPixelArray::SetValue(uint32_t index, Object* value) {
   uint8_t clamped_value = 0;
   if (index < static_cast<uint32_t>(length())) {
     if (value->IsSmi()) {
       int int_value = Smi::cast(value)->value();
       if (int_value < 0) {
         clamped_value = 0;
       } else if (int_value > 255) {
         clamped_value = 255;
       } else {
         clamped_value = static_cast<uint8_t>(int_value);
@@ skipping 1187 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal