[printing] Improve DescriptorArray printing

- display enum cache
- display capacity

Change-Id: I79eed54af36b1fbb5435d96b650c0823be380e20
Reviewed-on: https://chromium-review.googlesource.com/1027874
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52804}

src/objects-printer.cc

@@ -115,7 +115,7 @@ void HeapObject::HeapObjectPrint(std::ostream& os) {  // NOLINT
       BytecodeArray::cast(this)->BytecodeArrayPrint(os);
       break;
     case DESCRIPTOR_ARRAY_TYPE:
-      DescriptorArray::cast(this)->PrintDescriptors(os);
+      DescriptorArray::cast(this)->DescriptorArrayPrint(os);
       break;
     case TRANSITION_ARRAY_TYPE:
       TransitionArray::cast(this)->TransitionArrayPrint(os);
@@ -722,6 +722,21 @@ void Map::MapPrint(std::ostream& os) {  // NOLINT
   os << "\n";
 }
 
+void DescriptorArray::DescriptorArrayPrint(std::ostream& os) {
+  HeapObject::PrintHeader(os, "DescriptorArray");
+  os << "\n - capacity: " << length();
+  EnumCache* enum_cache = GetEnumCache();
+  os << "\n - enum_cache: ";
+  if (enum_cache->keys()->length() == 0) {
+    os << "empty";
+  } else {
+    os << enum_cache->keys()->length();
+    os << "\n   - keys: " << Brief(enum_cache->keys());
+    os << "\n   - indices: " << Brief(enum_cache->indices());
+  }
+  os << "\n - nof descriptors: " << number_of_descriptors();
+  PrintDescriptors(os);
+}
 
 void AliasedArgumentsEntry::AliasedArgumentsEntryPrint(
     std::ostream& os) {  // NOLINT
@@ -1977,9 +1992,7 @@ void Map::PrintMapDetails(std::ostream& os, JSObject* holder) {
   }
 }
 
-void DescriptorArray::PrintDescriptors(std::ostream& os) {  // NOLINT
-  HandleScope scope(GetIsolate());
-  os << "Descriptor array #" << number_of_descriptors() << ":";
+void DescriptorArray::PrintDescriptors(std::ostream& os) {
   for (int i = 0; i < number_of_descriptors(); i++) {
     Name* key = GetKey(i);
     os << "\n  [" << i << "]: ";

src/objects/descriptor-array.h

@@ -143,13 +143,14 @@ class DescriptorArray : public FixedArray {
   static const int kEntrySize = 3;
 
   // Print all the descriptors.
-  void PrintDescriptors(std::ostream& os);  // NOLINT
+  void PrintDescriptors(std::ostream& os);
   void PrintDescriptorDetails(std::ostream& os, int descriptor,
                               PropertyDetails::PrintMode mode);
 
 #if defined(DEBUG) || defined(OBJECT_PRINT)
   // For our gdb macros, we should perhaps change these in the future.
   void Print();
+  void DescriptorArrayPrint(std::ostream& os);
 #endif
 
   DECL_VERIFIER(DescriptorArray)