Port to new Q_UNREACHABLE_RETURN()

This is a semantic patch using ClangTidyTransformator to convert
sequences of Q_UNREACHABLE() + return into Q_UNREACHABLE_RETURN(),
newly added to qtbase.

    const std::string unr = "unr", val = "val", ret = "ret";
    auto makeUnreachableReturn = cat("Q_UNREACHABLE_RETURN(",
                                    ifBound(val, cat(node(val)), cat("")),
                                    ")");
    auto ignoringSwitchCases = [](auto stmt) {
        return anyOf(stmt, switchCase(subStmt(stmt)));
    };

    makeRule(stmt(ignoringSwitchCases(stmt(isExpandedFromMacro("Q_UNREACHABLE")).bind(unr)),
                  nextStmt(returnStmt(optionally(hasReturnValue(expr().bind(val)))).bind(ret))),
             {changeTo(node(unr), cat(makeUnreachableReturn,
                                      ";")), // TODO: why is the ; lost w/o this?
              changeTo(node(ret), cat(""))},
             cat("use ", makeUnreachableReturn));

a.k.a qt-use-unreachable-return.

subStmt() and nextStmt() are non-standard matchers.

Change-Id: I3855b2dc8523db1ea860f72ad9818738162495c6
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 1 insertions, 2 deletions

diff --git a/src/websockets/qwebsocketframe.cpp b/src/websockets/qwebsocketframe.cpp
index ac29d1c..6ce8c13 100644
--- a/src/websockets/qwebsocketframe.cpp
+++ b/src/websockets/qwebsocketframe.cpp
@@ -212,8 +212,7 @@ void QWebSocketFrame::readFrame(QIODevice *pIoDevice)
             return;
 
         default:
-            Q_UNREACHABLE();
-            return;
+            Q_UNREACHABLE_RETURN();
         }
     }
 }