More details printed for Map, DescriptorArray and TransitionArray.

src/objects-printer.cc

 // Copyright 2012 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/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
 #include "src/jsregexp.h"
@@ skipping 329 matching lines @@
       os << "\n   context: " << Brief(p->get(0))
          << "\n   arguments: " << Brief(p->get(1)) << "\n";
       break;
     }
   }
 }
 
 
 void JSObject::PrintTransitions(std::ostream& os) {  // NOLINT
   if (!map()->HasTransitionArray()) return;
-  TransitionArray* transitions = map()->transitions();
-  for (int i = 0; i < transitions->number_of_transitions(); i++) {
-    Name* key = transitions->GetKey(i);
-    os << "   ";
-    key->NamePrint(os);
-    os << ": ";
-    if (key == GetHeap()->frozen_symbol()) {
-      os << " (transition to frozen)\n";
-    } else if (key == GetHeap()->elements_transition_symbol()) {
-      os << " (transition to "
-         << ElementsKindToString(transitions->GetTarget(i)->elements_kind())
-         << ")\n";
-    } else if (key == GetHeap()->observed_symbol()) {
-      os << " (transition to Object.observe)\n";
-    } else {
-      switch (transitions->GetTargetDetails(i).type()) {
-        case FIELD: {
-          os << " (transition to field)\n";
-          break;
-        }
-        case CONSTANT:
-          os << " (transition to constant)\n";
-          break;
-        case CALLBACKS:
-          os << " (transition to callback)\n";
-          break;
-        // Values below are never in the target descriptor array.
-        case NORMAL:
-          UNREACHABLE();
-          break;
-      }
-    }
-  }
+  map()->transitions()->PrintTransitions(os, false);
 }
 
 
 void JSObject::JSObjectPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "JSObject");
   // Don't call GetElementsKind, its validation code can cause the printer to
   // fail when debugging.
   PrototypeIterator iter(GetIsolate(), this);
   os << " - map = " << reinterpret_cast<void*>(map()) << " ["
      << ElementsKindToString(this->map()->elements_kind())
@@ skipping 42 matching lines @@
 
 void Map::MapPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "Map");
   os << " - type: " << TypeToString(instance_type()) << "\n";
   os << " - instance size: " << instance_size() << "\n";
   os << " - inobject properties: " << inobject_properties() << "\n";
   os << " - elements kind: " << ElementsKindToString(elements_kind());
   os << "\n - pre-allocated property fields: "
      << pre_allocated_property_fields() << "\n";
   os << " - unused property fields: " << unused_property_fields() << "\n";
+  if (is_dictionary_map()) os << " - dictionary_map\n";
+  if (is_prototype_map()) os << " - prototype_map\n";
   if (is_hidden_prototype()) os << " - hidden_prototype\n";
   if (has_named_interceptor()) os << " - named_interceptor\n";
   if (has_indexed_interceptor()) os << " - indexed_interceptor\n";
   if (is_undetectable()) os << " - undetectable\n";
   if (has_instance_call_handler()) os << " - instance_call_handler\n";
   if (is_access_check_needed()) os << " - access_check_needed\n";
   if (is_frozen()) {
     os << " - frozen\n";
   } else if (!is_extensible()) {
     os << " - sealed\n";
   }
   os << " - back pointer: " << Brief(GetBackPointer());
   os << "\n - instance descriptors " << (owns_descriptors() ? "(own) " : "")
      << "#" << NumberOfOwnDescriptors() << ": "
      << Brief(instance_descriptors());
   if (HasTransitionArray()) {
     os << "\n - transitions: " << Brief(transitions());
   }
   os << "\n - prototype: " << Brief(prototype());
   os << "\n - constructor: " << Brief(constructor());
   os << "\n - code cache: " << Brief(code_cache());
   os << "\n - dependent code: " << Brief(dependent_code());
   os << "\n";
+  instance_descriptors()->PrintDescriptors(os);
+  if (HasTransitionArray()) {
+    transitions()->PrintTransitions(os);
+  }

[Toon Verwaest, 2014/10/23 09:54:51]

This is a bit too much info I think.

[Igor Sheludko, 2014/10/23 11:21:27]

Done.

+  os << "\n";
 }
 
 
 void CodeCache::CodeCachePrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "CodeCache");
   os << "\n - default_cache: " << Brief(default_cache());
   os << "\n - normal_type_cache: " << Brief(normal_type_cache());
 }
 
 
@@ skipping 120 matching lines @@
   }
   if (len != length()) {
     os << truncated_epilogue;
   }
 
   if (!StringShape(this).IsInternalized()) os << "\"";
 }
 
 
 void Name::NamePrint(std::ostream& os) {  // NOLINT
-  if (IsString())
+  if (IsString()) {
     String::cast(this)->StringPrint(os);
-  else
+  } else if (IsSymbol()) {
+    Symbol::cast(this)->name()->Print(os);
+  } else {
     os << Brief(this);
+  }
 }
 
 
 // This method is only meant to be called from gdb for debugging purposes.
 // Since the string can also be in two-byte encoding, non-Latin1 characters
 // will be ignored in the output.
 char* String::ToAsciiArray() {
   // Static so that subsequent calls frees previously allocated space.
   // This also means that previous results will be overwritten.
   static char* buffer = NULL;
@@ skipping 454 matching lines @@
   HeapObject::PrintHeader(os, "BreakPointInfo");
   os << "\n - code_position: " << code_position()->value();
   os << "\n - source_position: " << source_position()->value();
   os << "\n - statement_position: " << statement_position()->value();
   os << "\n - break_point_objects: " << Brief(break_point_objects());
   os << "\n";
 }
 
 
 void DescriptorArray::PrintDescriptors(std::ostream& os) {  // NOLINT
-  os << "Descriptor array  " << number_of_descriptors() << "\n";
+  os << "Descriptor array " << number_of_descriptors() << "\n";
   for (int i = 0; i < number_of_descriptors(); i++) {
     Descriptor desc;
     Get(i, &desc);
-    os << " " << i << ": " << desc;
+    os << " " << i << ": " << desc << "\n";
   }
   os << "\n";
 }
 
 
-void TransitionArray::PrintTransitions(std::ostream& os) {  // NOLINT
-  os << "Transition array  %d\n", number_of_transitions();
+void TransitionArray::PrintTransitions(std::ostream& os,
+                                       bool print_header) {  // NOLINT
+  if (print_header) {
+    os << "Transition array " << number_of_transitions() << "\n";
+  }
   for (int i = 0; i < number_of_transitions(); i++) {
-    os << " " << i << ": ";
-    GetKey(i)->NamePrint(os);
+    Name* key = GetKey(i);
+    os << "   ";
+    key->NamePrint(os);
     os << ": ";
-    switch (GetTargetDetails(i).type()) {
-      case FIELD: {
-        os << " (transition to field)\n";
-        break;
+    if (key == GetHeap()->frozen_symbol()) {
+      os << " (transition to frozen)";
+    } else if (key == GetHeap()->elements_transition_symbol()) {
+      os << " (transition to "
+         << ElementsKindToString(GetTarget(i)->elements_kind()) << ")";
+    } else if (key == GetHeap()->observed_symbol()) {
+      os << " (transition to Object.observe)";
+    } else {
+      PropertyDetails details = GetTargetDetails(i);
+      switch (details.type()) {
+        case FIELD: {
+          os << " (transition to field)";
+          break;
+        }
+        case CONSTANT:
+          os << " (transition to constant " << Brief(GetTargetValue(i)) << ")";
+          break;
+        case CALLBACKS:
+          os << " (transition to callback " << Brief(GetTargetValue(i)) << ")";
+          break;
+        // Values below are never in the target descriptor array.
+        case NORMAL:
+          UNREACHABLE();
+          break;
       }
-      case CONSTANT:
-        os << " (transition to constant)\n";
-        break;
-      case CALLBACKS:
-        os << " (transition to callback)\n";
-        break;
-      // Values below are never in the target descriptor array.
-      case NORMAL:
-        UNREACHABLE();
-        break;
+      os << ", attrs: " << details.attributes();
     }
+    os << " -> " << Brief(GetTarget(i)) << "\n";
   }
-  os << "\n";
 }
 
 
 #endif  // OBJECT_PRINT
 
 
 } }  // namespace v8::internal