- A prototype which allows to expose CanvasPixelArray functionality...

src/objects-debug.cc

Index: src/objects-debug.cc
===================================================================
--- src/objects-debug.cc	(revision 2544)
+++ src/objects-debug.cc	(working copy)
@@ -115,6 +115,9 @@
     case BYTE_ARRAY_TYPE:
       ByteArray::cast(this)->ByteArrayPrint();
       break;
+    case PIXEL_ARRAY_TYPE:
+      PixelArray::cast(this)->PixelArrayPrint();
+      break;
     case FILLER_TYPE:
       PrintF("filler");
       break;
@@ -191,6 +194,9 @@
     case BYTE_ARRAY_TYPE:
       ByteArray::cast(this)->ByteArrayVerify();
       break;
+    case PIXEL_ARRAY_TYPE:
+      PixelArray::cast(this)->PixelArrayVerify();
+      break;
     case CODE_TYPE:
       Code::cast(this)->CodeVerify();
       break;
@@ -264,11 +270,21 @@
 }
 
 
+void PixelArray::PixelArrayPrint() {
+  PrintF("pixel array");
+}
+
+
 void ByteArray::ByteArrayVerify() {
   ASSERT(IsByteArray());
 }
 
 
+void PixelArray::PixelArrayVerify() {
+  ASSERT(IsPixelArray());
+}
+
+
 void JSObject::PrintProperties() {
   if (HasFastProperties()) {
     DescriptorArray* descs = map()->instance_descriptors();
@@ -312,15 +328,30 @@
 
 
 void JSObject::PrintElements() {
-  if (HasFastElements()) {
-    FixedArray* p = FixedArray::cast(elements());
-    for (int i = 0; i < p->length(); i++) {
-      PrintF("   %d: ", i);
-      p->get(i)->ShortPrint();
-      PrintF("\n");
+  switch (GetElementsKind()) {
+    case FAST_ELEMENTS: {
+      // Print in array notation for non-sparse arrays.
+      FixedArray* p = FixedArray::cast(elements());
+      for (int i = 0; i < p->length(); i++) {
+        PrintF("   %d: ", i);
+        p->get(i)->ShortPrint();
+        PrintF("\n");
+      }
+      break;
     }
-  } else {
-    elements()->Print();
+    case PIXEL_ELEMENTS: {
+      PixelArray* p = PixelArray::cast(elements());
+      for (int i = 0; i < p->length(); i++) {
+        PrintF("   %d: %d\n", i, p->get(i));
+      }
+      break;
+    }
+    case DICTIONARY_ELEMENTS:
+      elements()->Print();
+      break;
+    default:
+      UNREACHABLE();
+      break;
   }
 }
 
@@ -402,6 +433,7 @@
     case LONG_EXTERNAL_STRING_TYPE: return "EXTERNAL_STRING";
     case FIXED_ARRAY_TYPE: return "FIXED_ARRAY";
     case BYTE_ARRAY_TYPE: return "BYTE_ARRAY";
+    case PIXEL_ARRAY_TYPE: return "PIXEL_ARRAY";
     case FILLER_TYPE: return "FILLER";
     case JS_OBJECT_TYPE: return "JS_OBJECT";
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE: return "JS_CONTEXT_EXTENSION_OBJECT";
@@ -1015,21 +1047,35 @@
         dict->Capacity() - dict->NumberOfElements();
   }
   // Indexed properties
-  if (HasFastElements()) {
-    info->number_of_objects_with_fast_elements_++;
-    int holes = 0;
-    FixedArray* e = FixedArray::cast(elements());
-    int len = e->length();
-    for (int i = 0; i < len; i++) {
-      if (e->get(i) == Heap::the_hole_value()) holes++;
+  switch (GetElementsKind()) {
+    case FAST_ELEMENTS: {
+      info->number_of_objects_with_fast_elements_++;
+      int holes = 0;
+      FixedArray* e = FixedArray::cast(elements());
+      int len = e->length();
+      for (int i = 0; i < len; i++) {
+        if (e->get(i) == Heap::the_hole_value()) holes++;
+      }
+      info->number_of_fast_used_elements_   += len - holes;
+      info->number_of_fast_unused_elements_ += holes;
+      break;
     }
-    info->number_of_fast_used_elements_   += len - holes;
-    info->number_of_fast_unused_elements_ += holes;
-  } else {
-    NumberDictionary* dict = element_dictionary();
-    info->number_of_slow_used_elements_ += dict->NumberOfElements();
-    info->number_of_slow_unused_elements_ +=
-        dict->Capacity() - dict->NumberOfElements();
+    case PIXEL_ELEMENTS: {
+      info->number_of_objects_with_fast_elements_++;
+      PixelArray* e = PixelArray::cast(elements());
+      info->number_of_fast_used_elements_ += e->length();
+      break;
+    }
+    case DICTIONARY_ELEMENTS: {
+      NumberDictionary* dict = element_dictionary();
+      info->number_of_slow_used_elements_ += dict->NumberOfElements();
+      info->number_of_slow_unused_elements_ +=
+          dict->Capacity() - dict->NumberOfElements();
+      break;
+    }
+    default:
+      UNREACHABLE();
+      break;
   }
 }