Basic support for tracking smi-only arrays on ia32.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 7d8f133e88edcf3f3c2245d66c2f769ca8483ea2..9c7874e526d2b85c23d7001cbcbddda4757f86be 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -82,6 +82,9 @@ void HeapObject::HeapObjectPrint(FILE* out) {
     case HEAP_NUMBER_TYPE:
       HeapNumber::cast(this)->HeapNumberPrint(out);
       break;
+    case FIXED_DOUBLE_ARRAY_TYPE:
+      FixedDoubleArray::cast(this)->FixedDoubleArrayPrint(out);
+      break;
     case FIXED_ARRAY_TYPE:
       FixedArray::cast(this)->FixedArrayPrint(out);
       break;
@@ -242,6 +245,54 @@ void ExternalDoubleArray::ExternalDoubleArrayPrint(FILE* out) {
 }
 
 
+static void PrintElementsKind(FILE* out, ElementsKind kind) {
+  switch (kind) {
+    case FAST_SMI_ONLY_ELEMENTS:
+      PrintF(out, "FAST_SMI_ONLY_ELEMENTS");
+      break;
+    case FAST_ELEMENTS:
+      PrintF(out, "FAST_ELEMENTS");
+      break;
+    case FAST_DOUBLE_ELEMENTS:
+      PrintF(out, "FAST_DOUBLE_ELEMENTS");
+      break;
+    case DICTIONARY_ELEMENTS:
+      PrintF(out, "DICTIONARY_ELEMENTS");
+      break;
+    case NON_STRICT_ARGUMENTS_ELEMENTS:
+      PrintF(out, "NON_STRICT_ARGUMENTS_ELEMENTS");
+      break;
+    case EXTERNAL_BYTE_ELEMENTS:
+      PrintF(out, "EXTERNAL_BYTE_ELEMENTS");
+      break;
+    case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
+      PrintF(out, "EXTERNAL_UNSIGNED_BYTE_ELEMENTS");
+      break;
+    case EXTERNAL_SHORT_ELEMENTS:
+      PrintF(out, "EXTERNAL_SHORT_ELEMENTS");
+      break;
+    case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
+      PrintF(out, "EXTERNAL_UNSIGNED_SHORT_ELEMENTS");
+      break;
+    case EXTERNAL_INT_ELEMENTS:
+      PrintF(out, "EXTERNAL_INT_ELEMENTS");
+      break;
+    case EXTERNAL_UNSIGNED_INT_ELEMENTS:
+      PrintF(out, "EXTERNAL_UNSIGNED_INT_ELEMENTS");
+      break;
+    case EXTERNAL_FLOAT_ELEMENTS:
+      PrintF(out, "EXTERNAL_FLOAT_ELEMENTS");
+      break;
+    case EXTERNAL_DOUBLE_ELEMENTS:
+      PrintF(out, "EXTERNAL_DOUBLE_ELEMENTS");
+      break;
+    case EXTERNAL_PIXEL_ELEMENTS:
+      PrintF(out, "EXTERNAL_DOUBLE_ELEMENTS");
+      break;
+  }
+}
+
+
 void JSObject::PrintProperties(FILE* out) {
   if (HasFastProperties()) {
     DescriptorArray* descs = map()->instance_descriptors();
@@ -265,16 +316,19 @@ void JSObject::PrintProperties(FILE* out) {
           PrintF(out, " (callback)\n");
           break;
         case ELEMENTS_TRANSITION:
-          PrintF(out, " (elements transition)\n");
+          PrintF(out, "(elements transition to ");
+          PrintElementsKind(out,
+                            Map::cast(descs->GetValue(i))->elements_kind());
+          PrintF(out, ")\n");
           break;
         case MAP_TRANSITION:
-          PrintF(out, " (map transition)\n");
+          PrintF(out, "(map transition)\n");
           break;
         case CONSTANT_TRANSITION:
-          PrintF(out, " (constant transition)\n");
+          PrintF(out, "(constant transition)\n");
           break;
         case NULL_DESCRIPTOR:
-          PrintF(out, " (null descriptor)\n");
+          PrintF(out, "(null descriptor)\n");
           break;
         default:
           UNREACHABLE();
@@ -288,7 +342,10 @@ void JSObject::PrintProperties(FILE* out) {
 
 
 void JSObject::PrintElements(FILE* out) {
-  switch (GetElementsKind()) {
+  // Don't call GetElementsKind, it's validate code can cause the printer to
+  // fail when debugging.
+  switch (map()->elements_kind()) {
+    case FAST_SMI_ONLY_ELEMENTS:
     case FAST_ELEMENTS: {
       // Print in array notation for non-sparse arrays.
       FixedArray* p = FixedArray::cast(elements());
@@ -396,8 +453,13 @@ void JSObject::PrintElements(FILE* out) {
 
 void JSObject::JSObjectPrint(FILE* out) {
   PrintF(out, "%p: [JSObject]\n", reinterpret_cast<void*>(this));
-  PrintF(out, " - map = %p\n", reinterpret_cast<void*>(map()));
-  PrintF(out, " - prototype = %p\n", reinterpret_cast<void*>(GetPrototype()));
+  PrintF(out, " - map = %p [", reinterpret_cast<void*>(map()));
+  // Don't call GetElementsKind, it's validate code can cause the printer to
+  // fail when debugging.
+  PrintElementsKind(out, this->map()->elements_kind());
+  PrintF(out,
+         "]\n - prototype = %p\n",
+         reinterpret_cast<void*>(GetPrototype()));
   PrintF(out, " {\n");
   PrintProperties(out);
   PrintElements(out);
@@ -528,6 +590,16 @@ void FixedArray::FixedArrayPrint(FILE* out) {
 }
 
 
+void FixedDoubleArray::FixedDoubleArrayPrint(FILE* out) {
+  HeapObject::PrintHeader(out, "FixedDoubleArray");
+  PrintF(out, " - length: %d", length());
+  for (int i = 0; i < length(); i++) {
+    PrintF(out, "\n  [%d]: %g", i, get_scalar(i));
+  }
+  PrintF(out, "\n");
+}
+
+
 void JSValue::JSValuePrint(FILE* out) {
   HeapObject::PrintHeader(out, "ValueObject");
   value()->Print(out);