Debugger: Work around for gdb reporting zero array sizes in some cases

Task-number: QTCREATORBUG-23998
Change-Id: I101d032705b66faf50260067f6aa604214f09298
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -1089,6 +1089,10 @@ class DumperBase():
         return '_ZN%sE' % ''.join(map(lambda x: '%d%s' % (len(x), x),
                                       typeName.split('::')))
 
+    def arrayItemCountFromTypeName(self, typeName, fallbackMax=1):
+        itemCount = typeName[typeName.find('[') + 1:typeName.find(']')]
+        return int(itemCount) if itemCount else fallbackMax
+
     def putCStyleArray(self, value):
         arrayType = value.type.unqualified()
         innerType = arrayType.ltarget
@@ -1107,10 +1111,7 @@ class DumperBase():
             # This should not happen. But it does, see QTCREATORBUG-14755.
             # GDB/GCC produce sizeof == 0 for QProcess arr[3]
             # And in the Nim string dumper.
-            s = value.type.name
-            itemCount = s[s.find('[') + 1:s.find(']')]
-            if not itemCount:
-                itemCount = '100'
+            itemCount = self.arrayItemCountFromTypeName(value.type.name, 100)
             arrayByteSize = int(itemCount) * innerType.size()
 
         n = arrayByteSize // innerType.size()

share/qtcreator/debugger/gdbbridge.py

@@ -341,6 +341,11 @@ class Dumper(DumperBase):
             #DumperBase.warn('ARRAY')
             nativeTargetType = nativeType.target().unqualified()
             targetType = self.fromNativeType(nativeTargetType)
+            if nativeType.sizeof == 0:
+                # QTCREATORBUG-23998, note that nativeType.name == None here,
+                # whereas str(nativeType) returns sth like 'QObject [5]'
+                count = self.arrayItemCountFromTypeName(str(nativeType), 1)
+            else:
                 count = nativeType.sizeof // nativeTargetType.sizeof
             return self.createArrayType(targetType, count)