Show total capacity on BList/BObjectList nodes.

- Since we currently limit the maximum number of child elements we'll
  show, it's helpful information to know the actual capacity of the list
  in case it contains more, especially when we later support requesting
  additional elements to be retrieved.

src/apps/debugger/value/value_nodes/BListValueNode.cpp

@@ -94,6 +94,68 @@ BListValueNode::BListElementNodeChild::ResolveLocation(
 }
 
 
+//#pragma mark - BListItemCountNodeChild
+
+class BListValueNode::BListItemCountNodeChild : public ValueNodeChild {
+public:
+								BListItemCountNodeChild(BVariant location,
+									BListValueNode* parent, Type* type);
+	virtual						~BListItemCountNodeChild();
+
+	virtual	const BString&		Name() const { return fName; };
+	virtual	Type*				GetType() const { return fType; };
+	virtual	ValueNode*			Parent() const { return fParent; };
+
+	virtual status_t			ResolveLocation(ValueLoader* valueLoader,
+									ValueLocation*& _location);
+
+private:
+	Type*						fType;
+	BListValueNode*				fParent;
+	BVariant					fLocation;
+	BString						fName;
+};
+
+
+BListValueNode::BListItemCountNodeChild::BListItemCountNodeChild(
+	BVariant location, BListValueNode* parent, Type* type)
+	:
+	ValueNodeChild(),
+	fType(type),
+	fParent(parent),
+	fLocation(location),
+	fName("Capacity")
+{
+	fType->AcquireReference();
+	fParent->AcquireReference();
+}
+
+
+BListValueNode::BListItemCountNodeChild::~BListItemCountNodeChild()
+{
+	fType->ReleaseReference();
+	fParent->ReleaseReference();
+}
+
+
+status_t
+BListValueNode::BListItemCountNodeChild::ResolveLocation(
+	ValueLoader* valueLoader, ValueLocation*& _location)
+{
+	ValueLocation* location = new(std::nothrow) ValueLocation();
+	if (location == NULL)
+		return B_NO_MEMORY;
+
+	ValuePieceLocation piece;
+	piece.SetToMemory(fLocation.ToUInt64());
+	piece.SetSize(sizeof(int32));
+	location->AddPiece(piece);
+
+	_location = location;
+	return B_OK;
+}
+
+
 //#pragma mark - BListValueNode
 
 BListValueNode::BListValueNode(ValueNodeChild* nodeChild,
@@ -102,6 +164,7 @@ BListValueNode::BListValueNode(ValueNodeChild* nodeChild,
 	ValueNode(nodeChild),
 	fType(type),
 	fLoader(NULL),
+	fItemCountType(NULL),
 	fItemCount(0)
 {
 	fType->AcquireReference();
@@ -114,6 +177,9 @@ BListValueNode::~BListValueNode()
 	for (int32 i = 0; i < fChildren.CountItems(); i++)
 		fChildren.ItemAt(i)->ReleaseReference();
 
+	if (fItemCountType != NULL)
+		fItemCountType->ReleaseReference();
+
 	delete fLoader;
 }
 
@@ -154,7 +220,7 @@ BListValueNode::ResolvedLocationAndValue(ValueLoader* valueLoader,
 	ValueLocation* memberLocation = NULL;
 	CompoundType* baseType = dynamic_cast<CompoundType*>(fType);
 
-	if (baseType->CountTemplateParameters()) {
+	if (baseType->CountTemplateParameters() != 0) {
 		// for BObjectList we need to walk up
 		// the hierarchy: BObjectList -> _PointerList_ -> BList
 		baseType = dynamic_cast<CompoundType*>(baseType->BaseTypeAt(0)
@@ -200,6 +266,11 @@ BListValueNode::ResolvedLocationAndValue(ValueLoader* valueLoader,
 				return error;
 			}
 
+			fItemCountType = member->GetType();
+			fItemCountType->AcquireReference();
+
+			fItemCountLocation = memberLocation->PieceAt(0).address;
+
 			BVariant listSize;
 			error = valueLoader->LoadValue(memberLocation, valueType,
 				false, listSize);
@@ -229,11 +300,19 @@ BListValueNode::ResolvedLocationAndValue(ValueLoader* valueLoader,
 status_t
 BListValueNode::CreateChildren()
 {
-	if (fItemCount == 0 || fChildrenCreated) {
-		fChildrenCreated = true;
+	if (fChildrenCreated)
 		return B_OK;
-	}
 
+	BListItemCountNodeChild* countChild = new(std::nothrow)
+		BListItemCountNodeChild(fItemCountLocation, this, fItemCountType);
+
+	if (countChild == NULL)
+		return B_NO_MEMORY;
+
+	countChild->SetContainer(fContainer);
+	fChildren.AddItem(countChild);
+
+	BReference<Type> addressTypeRef;
 	Type* type = NULL;
 	CompoundType* objectType = dynamic_cast<CompoundType*>(fType);
 	if (objectType->CountTemplateParameters() != 0) {
@@ -244,6 +323,7 @@ BListValueNode::CreateChildren()
 			return result;
 
 		type = addressType;
+		addressTypeRef.SetTo(type, true);
 	} else {
 		BString typeName;
 		TypeLookupConstraints constraints;

src/apps/debugger/value/value_nodes/BListValueNode.h

@@ -38,9 +38,11 @@ public:
 
 private:
 			class BListElementNodeChild;
+			class BListItemCountNodeChild;
 
 			// for GCC2
 			friend class BListElementNodeChild;
+			friend class BListItemCountNodeChild;
 
 			typedef BObjectList<ValueNodeChild> ChildNodeList;
 
@@ -50,6 +52,8 @@ private:
 			ChildNodeList			fChildren;
 			ValueLoader*			fLoader;
 			BVariant				fDataLocation;
+			BVariant				fItemCountLocation;
+			Type*					fItemCountType;
 			int32					fItemCount;
 };