Debugger: Add dumper for Qt3's (sic!) QString

Change-Id: I24d266587425a5c50ec3dcb548a29877730cbdff
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

share/qtcreator/debugger/dumper.py

@@ -449,7 +449,7 @@ class DumperBase:
                 data = data & 0xffffffff
             else:
                 data = data & 0xffffffffffffffff
-        else:
+        elif self.qtVersion() >= 0x040000:
             # Data:
             # - QBasicAtomicInt ref;
             # - int alloc, size;
@@ -458,6 +458,15 @@ class DumperBase:
             alloc = self.extractInt(addr + 4)
             size = self.extractInt(addr + 8)
             data = self.extractPointer(addr + 8 + self.ptrSize())
+        else:
+            # Data:
+            # - QShared count;
+            # - QChar *unicode
+            # - char *ascii
+            # - uint len: 30
+            size = self.extractInt(addr + 3 * self.ptrSize()) & 0x3ffffff
+            alloc = size  # pretend.
+            data = self.extractPointer(addr + self.ptrSize())
         return data, size, alloc
 
     # addr is the begin of a QByteArrayData structure

share/qtcreator/debugger/gdbbridge.py

@@ -1501,8 +1501,16 @@ class Dumper(DumperBase):
             pass
 
         try:
-            # Seemingly needed with Debian's GDB 7.4.1
+            # Last fall backs.
             s = gdb.execute("ptype QByteArray", to_string=True)
+            if s.find("QMemArray") >= 0:
+                # Qt 3.
+                self.qtNamespaceToReport = ""
+                self.qtNamespace = lambda: ""
+                self.qtVersion = lambda: 0x30308
+                self.fallbackQtVersion = 0x30308
+                return ""
+            # Seemingly needed with Debian's GDB 7.4.1
             ns = s[s.find("class")+6:s.find("QByteArray")]
             if len(ns):
                 self.qtNamespaceToReport = ns