Debugger: Add an option to show simple values as text annotations

Change-Id: I726d8559d7e28abd776ce483d5f670be5af09412
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/debugger/watchdata.cpp

@@ -520,6 +520,7 @@ QString WatchItem::toToolTip() const
         formatToolTipRow(str, tr("Static Object Size"), tr("%n bytes", nullptr, size));
     formatToolTipRow(str, tr("Internal ID"), internalName());
     formatToolTipRow(str, tr("Creation Time in ms"), QString::number(int(time * 1000)));
+    formatToolTipRow(str, tr("Source"), sourceExpression());
     str << "</table></body></html>";
     return res;
 }
@@ -578,6 +579,31 @@ QString WatchItem::expression() const
     return name;
 }
 
+QString WatchItem::sourceExpression() const
+{
+    const WatchItem *p = parent();
+    if (!p)
+        return {}; // Root
+
+    const WatchItem *pp = p->parent();
+    if (!pp)
+        return {}; // local
+
+    const WatchItem *ppp = pp->parent();
+    if (!ppp)
+        return name; // local.x -> 'x'
+
+    // Enforce some arbitrary, but fixed limit to avoid excessive creation
+    // of very likely unused strings which are for convenience only.
+    if (arrayIndex >= 0 && arrayIndex <= 16)
+        return QString("%1[%2]").arg(p->sourceExpression()).arg(arrayIndex);
+
+    if (p->name == '*')
+        return QString("%1->%2").arg(pp->sourceExpression(), name);
+
+    return QString("%1.%2").arg(p->sourceExpression(), name);
+}
+
 } // namespace Internal
 } // namespace Debugger