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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ //
++ // crashdiag_test — deliberately crashes using the real QtFuzzRuntime crash
++ // handler (include/crashdiag.h), to verify that a fatal signal (POSIX) /
++ // structured exception (Windows) is correctly attributed to whatever call
++ // was recorded via setCurrentCall() immediately beforehand.
++ //
++ // This exercises the exact mechanism that generated fuzz tests rely on to
++ // answer "which API call actually crashed" — deterministically and with
++ // zero Qt dependency, so it runs identically on macOS, Windows, and Linux.
++ //
++ // Usage: crashdiag_test <segv|abort>
++
++ #include "crashdiag.h"
++
++ #include <cstdlib>
++ #include <cstring>
++ #include <iostream>
++
++ int main(int argc, char **argv)
++ {
++ if (argc < 2) {
++ std::cerr << "Usage: crashdiag_test <segv|abort>\n";
++ return 2;
++ }
++
++ QtFuzzRuntime::installCrashHandler("FakeClass");
++ QtFuzzRuntime::setCurrentCall("FakeClass::crashyMethod(int)");
++ QtFuzzRuntime::setIteration(7);
++
++ if (std::strcmp(argv[1], "abort") == 0) {
++ std::abort();
++ } else if (std::strcmp(argv[1], "segv") == 0) {
++ volatile int *p = nullptr;
++ *p = 1;
++ } else {
++ std::cerr << "Unknown mode: " << argv[1] << "\n";
++ return 2;
++ }
++
++ return 0; // unreachable if the crash fired
++ }