Debugger: Allow gdb inferior calls for symbol address finding

Amends a9e8b106a4, otherwise Qt version discovery breaks.

Change-Id: I2b682935e4e5783328fc43840681b988306c6cc5
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -966,7 +966,10 @@ class DumperBase():
                 children = [('error', error)]
                 self.putSpecialValue("notcallable", children=children)
             else:
-                self.putItem(result)
+                if result is None:
+                    self.putSpecialValue("notcallable")
+                else:
+                    self.putItem(result)
 
     def call(self, rettype, value, func, *args):
         return self.callHelper(rettype, value, func, args)

share/qtcreator/debugger/gdbbridge.py

@@ -737,11 +737,11 @@ class Dumper(DumperBase):
         return None if val is None else self.fromNativeValue(val)
 
     def nativeParseAndEvaluate(self, exp):
+        # FIXME: This breaks symbol discovery
+        if not self.allowInferiorCalls:
+            return None
         #self.warn('EVALUATE "%s"' % exp)
         try:
-            if not self.allowInferiorCalls:
-                return None
-
             val = gdb.parse_and_eval(exp)
             return val
         except RuntimeError as error:
@@ -1041,6 +1041,10 @@ class Dumper(DumperBase):
         except:
             return 0
 
+    def symbolAddress(self, symbolName):
+        res = self.findSymbol(symbolName)
+        return res
+
     def handleNewObjectFile(self, objfile):
         name = objfile.filename
         if self.isWindowsTarget():