Add support for ES6 Symbol in heap profiler

src/heap-snapshot-generator.cc

 // Copyright 2013 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 "v8.h"
 
 #include "heap-snapshot-generator-inl.h"
 
 #include "allocation-tracker.h"
 #include "code-stubs.h"
@@ skipping 137 matching lines @@
     case kClosure: return "/closure/";
     case kString: return "/string/";
     case kCode: return "/code/";
     case kArray: return "/array/";
     case kRegExp: return "/regexp/";
     case kHeapNumber: return "/number/";
     case kNative: return "/native/";
     case kSynthetic: return "/synthetic/";
     case kConsString: return "/concatenated string/";
     case kSlicedString: return "/sliced string/";
+    case kSymbol: return "/symbol/";
     default: return "???";
   }
 }
 
 
 // It is very important to keep objects that form a heap snapshot
 // as small as possible.
 namespace {  // Avoid littering the global namespace.
 
 template <size_t ptr_size> struct SnapshotSizeConstants;
@@ skipping 676 matching lines @@
       return AddEntry(object,
                       HeapEntry::kConsString,
                       "(concatenated string)");
     if (string->IsSlicedString())
       return AddEntry(object,
                       HeapEntry::kSlicedString,
                       "(sliced string)");
     return AddEntry(object,
                     HeapEntry::kString,
                     names_->GetName(String::cast(object)));
+  } else if (object->IsSymbol()) {
+    return AddEntry(object, HeapEntry::kSymbol, "symbol");
   } else if (object->IsCode()) {
     return AddEntry(object, HeapEntry::kCode, "");
   } else if (object->IsSharedFunctionInfo()) {
     String* name = String::cast(SharedFunctionInfo::cast(object)->name());
     return AddEntry(object,
                     HeapEntry::kCode,
                     names_->GetName(name));
   } else if (object->IsScript()) {
     Object* name = Script::cast(object)->name();
     return AddEntry(object,
@@ skipping 227 matching lines @@
   if (obj->IsFixedArray()) return false;  // FixedArrays are processed on pass 2
 
   if (obj->IsJSGlobalProxy()) {
     ExtractJSGlobalProxyReferences(entry, JSGlobalProxy::cast(obj));
   } else if (obj->IsJSArrayBuffer()) {
     ExtractJSArrayBufferReferences(entry, JSArrayBuffer::cast(obj));
   } else if (obj->IsJSObject()) {
     ExtractJSObjectReferences(entry, JSObject::cast(obj));
   } else if (obj->IsString()) {
     ExtractStringReferences(entry, String::cast(obj));
+  } else if (obj->IsSymbol()) {
+    ExtractSymbolReferences(entry, Symbol::cast(obj));
   } else if (obj->IsMap()) {
     ExtractMapReferences(entry, Map::cast(obj));
   } else if (obj->IsSharedFunctionInfo()) {
     ExtractSharedFunctionInfoReferences(entry, SharedFunctionInfo::cast(obj));
   } else if (obj->IsScript()) {
     ExtractScriptReferences(entry, Script::cast(obj));
   } else if (obj->IsAccessorPair()) {
     ExtractAccessorPairReferences(entry, AccessorPair::cast(obj));
   } else if (obj->IsCodeCache()) {
     ExtractCodeCacheReferences(entry, CodeCache::cast(obj));
@@ skipping 126 matching lines @@
     SetInternalReference(cs, entry, "second", cs->second(),
                          ConsString::kSecondOffset);
   } else if (string->IsSlicedString()) {
     SlicedString* ss = SlicedString::cast(string);
     SetInternalReference(ss, entry, "parent", ss->parent(),
                          SlicedString::kParentOffset);
   }
 }
 
 
+void V8HeapExplorer::ExtractSymbolReferences(int entry, Symbol* symbol) {
+  SetInternalReference(symbol, entry,
+                       "name", symbol->name(),
+                       Symbol::kNameOffset);
+}
+
+
 void V8HeapExplorer::ExtractContextReferences(int entry, Context* context) {
   if (context == context->declaration_context()) {
     ScopeInfo* scope_info = context->closure()->shared()->scope_info();
     // Add context allocated locals.
     int context_locals = scope_info->ContextLocalCount();
     for (int i = 0; i < context_locals; ++i) {
       String* local_name = scope_info->ContextLocalName(i);
       int idx = Context::MIN_CONTEXT_SLOTS + i;
       SetContextReference(context, entry, local_name, context->get(idx),
                           Context::OffsetOfElementAt(idx));
@@ skipping 1892 matching lines @@
   writer_->AddString("\"<dummy>\"");
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 } }  // namespace v8::internal