Debugger: Add a backend specific Dumper.hasChildWithName

Change-Id: I89432915f2b6eb52e706d344b9e7998e1f96ab1f
Reviewed-by: hjk <hjk121@nokiamail.com>

share/qtcreator/debugger/gdbbridge.py

@@ -717,6 +717,13 @@ class Dumper(DumperBase):
     def call(self, value, func, *args):
         return self.call2(value, func, args)
 
+    def hasChildWithName(self, value, name):
+        try:
+            value[name]
+            return True
+        except:
+            return False
+
     def makeValue(self, type, init):
         type = "::" + stripClassTag(str(type));
         # Avoid malloc symbol clash with QVector.

share/qtcreator/debugger/lldbbridge.py

@@ -377,6 +377,9 @@ class Dumper(DumperBase):
         typeClass = typeobj.GetTypeClass()
         return typeClass == lldb.eTypeClassBuiltin
 
+    def hasChildWithName(self, value, name):
+        return value.GetChildMemberWithName(name).IsValid()
+
     def childAt(self, value, index):
         return value.GetChildAtIndex(index)
 

share/qtcreator/debugger/stdtypes.py

@@ -288,10 +288,10 @@ def stdTreeIteratorHelper(d, value):
         nodeType = d.lookupType(nodeTypeName)
         data = node.cast(nodeType)["_M_value_field"]
         with Children(d):
-            try:
+            if d.hasChildWithName(data, "first"):
                 d.putSubItem("first", data["first"])
                 d.putSubItem("second", data["second"])
-            except:
+            else:
                 d.putSubItem("value", data)
             with SubItem(d, "node"):
                 d.putNumChild(1)