Copy fbjni library from react-native

lib/fb/assert.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#include <cstdarg>
+#include <stdio.h>
+
+#include <fb/assert.h>
+#include <fb/log.h>
+
+namespace facebook {
+
+#define ASSERT_BUF_SIZE 4096
+static char sAssertBuf[ASSERT_BUF_SIZE];
+static AssertHandler gAssertHandler;
+
+void assertInternal(const char* formatstr ...) {
+    va_list va_args;
+    va_start(va_args, formatstr);
+    vsnprintf(sAssertBuf, sizeof(sAssertBuf), formatstr, va_args);
+    va_end(va_args);
+    if (gAssertHandler != NULL) {
+        gAssertHandler(sAssertBuf);
+    }
+    FBLOG(LOG_FATAL, "fbassert", "%s", sAssertBuf);
+    // crash at this specific address so that we can find our crashes easier
+    *(int*)0xdeadb00c = 0;
+    // let the compiler know we won't reach the end of the function
+     __builtin_unreachable();
+}
+
+void setAssertHandler(AssertHandler assertHandler) {
+    gAssertHandler = assertHandler;
+}
+
+} // namespace facebook