1 files changed, 86 insertions, 0 deletions
diff --git a/src/corelib/kernel/qtmochelpers.h b/src/corelib/kernel/qtmochelpers.h
new file mode 100644
index 0000000000..9d75177645
--- /dev/null
+++ b/src/corelib/kernel/qtmochelpers.h
@@ -0,0 +1,86 @@
+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QTMOCHELPERS_H
+#define QTMOCHELPERS_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists to be used by the code that
+// moc generates. This file will not change quickly, but it over the long term,
+// it will likely change or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+
+#include <algorithm> // std::min
+#include <limits>
+
+#if 0
+#pragma qt_no_master_include
+#endif
+
+QT_BEGIN_NAMESPACE
+namespace QtMocHelpers {
+// The maximum Size of a string literal is 2 GB on 32-bit and 4 GB on 64-bit
+// (but the compiler is likely to give up before you get anywhere near that much)
+static constexpr size_t MaxStringSize =
+        (std::min)(size_t((std::numeric_limits<uint>::max)()),
+                   size_t((std::numeric_limits<qsizetype>::max)()));
+
+template <uint... Nx> constexpr size_t stringDataSizeHelper(std::integer_sequence<uint, Nx...>)
+{
+    // same as:
+    //   return (0 + ... + Nx);
+    // but not using the fold expression to avoid exceeding compiler limits
+    size_t total = 0;
+    uint sizes[] = { Nx... };
+    for (uint n : sizes)
+        total += n;
+    return total;
+}
+
+template <int Count, size_t StringSize> struct StringData
+{
+    static_assert(StringSize <= MaxStringSize, "Meta Object data is too big");
+    uint offsetsAndSizes[Count] = {};
+    char stringdata0[StringSize] = {};
+    constexpr StringData() = default;
+};
+
+template <uint... Nx> constexpr auto stringData(const char (&...strings)[Nx])
+{
+    constexpr size_t StringSize = stringDataSizeHelper<Nx...>({});
+    constexpr size_t Count = 2 * sizeof...(Nx);
+
+    StringData<Count, StringSize> result;
+    const char *inputs[] = { strings... };
+    uint sizes[] = { Nx... };
+
+    uint offset = 0;
+    char *output = result.stringdata0;
+    for (size_t i = 0; i < sizeof...(Nx); ++i) {
+        // copy the input string, including the terminating null
+        uint len = sizes[i];
+        for (uint j = 0; j < len; ++j)
+            output[offset + j] = inputs[i][j];
+        result.offsetsAndSizes[2 * i] = offset + sizeof(result.offsetsAndSizes);
+        result.offsetsAndSizes[2 * i + 1] = len - 1;
+        offset += len;
+    }
+
+    return result;
+}
+
+#  define QT_MOC_HAS_STRINGDATA       1
+
+} // namespace QtMocHelpers
+QT_END_NAMESPACE
+
+QT_USE_NAMESPACE
+
+#endif // QTMOCHELPERS_H