Squash commits for public release

libs/libcxx/abi/cxa_runtime.cpp

@@ -0,0 +1,40 @@
+#include "cxxabi.h"
+
+#define __EXIT_ENTRIES_COUNT (64)
+
+extern "C" {
+VIS_HIDDEN void* __dso_handle;
+
+struct VIS_HIDDEN __termination_info {
+    void (*func)(void*);
+    void* arg;
+    void* dso_handle;
+};
+
+static struct __termination_info __exit_info[__EXIT_ENTRIES_COUNT];
+static int __exit_counter = 0;
+
+int __cxa_atexit(void (*func)(void*), void* arg, void* dso_handle)
+{
+    if (__exit_counter >= __EXIT_ENTRIES_COUNT) {
+        return -1;
+    }
+
+    __exit_info[__exit_counter++] = {
+        .func = func,
+        .arg = arg,
+        .dso_handle = dso_handle,
+    };
+    return 0;
+}
+
+void __cxa_finalize(void* dso_handle)
+{
+    for (int i = __exit_counter - 1; i >= 0; i--) {
+        if (dso_handle && __exit_info[i].dso_handle != dso_handle) {
+            continue;
+        }
+        __exit_info[i].func(__exit_info[i].arg);
+    }
+}
+}