Add __cxa_atexit benchmark
The benchmark calls __cxa_atexit 100000 times, then either exits early
without calling the destructors (_Exit) or exits normally, calling them
(exit).
Test: mmma bionic/benchmarks/spawn
Change-Id: I41fe702d6ef11acb7a1dec95bf546b5dc693bd4a
diff --git a/benchmarks/spawn/bench_cxa_atexit.cpp b/benchmarks/spawn/bench_cxa_atexit.cpp
new file mode 100644
index 0000000..95849f4
--- /dev/null
+++ b/benchmarks/spawn/bench_cxa_atexit.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <string>
+
+extern "C" int __cxa_atexit(void (*func)(void*), void* arg, void* dso);
+
+extern void* __dso_handle;
+
+static void dtor_func(void*) {}
+
+// Prevent the compiler from optimizing out the __cxa_atexit call.
+void (*volatile g_pdtor_func)(void*) = dtor_func;
+
+int main(int argc, char* argv[]) {
+ auto usage = [&argv]() {
+ fprintf(stderr, "usage: %s COUNT MODE\n", argv[0]);
+ fprintf(stderr, "MODE is one of '_Exit' or 'exit'.\n");
+ exit(1);
+ };
+
+ if (argc != 3) usage();
+
+ int count = atoi(argv[1]);
+
+ // Two modes: "_Exit" ==> exit early w/o calling dtors, "exit" ==> call dtors on exit.
+ std::string mode = argv[2];
+ if (mode != "_Exit" && mode != "exit") usage();
+
+ for (int i = 0; i < count; ++i) {
+ __cxa_atexit(g_pdtor_func, nullptr, &__dso_handle);
+ }
+
+ if (mode == "_Exit") {
+ _Exit(0);
+ } else {
+ exit(0);
+ }
+}