Added GetDIEByPredicate() template method simplifying the task of check an

entry, its abstract origin and specification for something.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33312 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debugger/dwarf/DwarfUtils.h

@@ -28,7 +28,38 @@ public:
 									const char*& _directory,
 									const char*& _file,
 									int32& _line, int32& _column);
+
+	template<typename EntryType, typename Predicate>
+	static	EntryType*			GetDIEByPredicate(EntryType* entry,
+									const Predicate& predicate);
 };
 
 
+template<typename EntryType, typename Predicate>
+/*static*/ EntryType*
+DwarfUtils::GetDIEByPredicate(EntryType* entry, const Predicate& predicate)
+{
+	if (predicate(entry))
+		return entry;
+
+	// try the abstract origin
+	if (EntryType* abstractOrigin = dynamic_cast<EntryType*>(
+			entry->AbstractOrigin())) {
+		entry = abstractOrigin;
+		if (predicate(entry))
+			return entry;
+	}
+
+	// try the specification
+	if (EntryType* specification = dynamic_cast<EntryType*>(
+			entry->Specification())) {
+		entry = specification;
+		if (predicate(entry))
+			return entry;
+	}
+
+	return NULL;
+}
+
+
 #endif	// DWARF_UTILS_H