Error on unhandled exceptions in FFI callbacks

This has been discussed and agreed upon in a previous PR[1].

[1] <php#5120>

Author: cmb69

ext/ffi/ffi.c

@@ -887,7 +887,8 @@ static void zend_ffi_callback_trampoline(ffi_cif* cif, void* ret, void** args, v
 	free_alloca(fci.params, use_heap);
 
 	if (EG(exception)) {
-		return;
+		zend_throw_error(zend_ffi_exception_ce, "Uncaught %s in PHP FFI callback", ZSTR_VAL(EG(exception)->ce->name));
+		zend_exception_error(EG(exception), E_ERROR);
 	}
 
 	ret_type = ZEND_FFI_TYPE(callback_data->type->func.ret_type);

ext/ffi/tests/bug79177.phpt

@@ -18,14 +18,14 @@ typedef char (*zend_write_func_t)(const char *str, size_t str_length);
 extern zend_write_func_t zend_write;
 ", ffi_get_php_dll_name());
 
-echo "Before", PHP_EOL;
+echo "Before\n";
 
 $originalHandler = clone $php->zend_write;
 $php->zend_write = function($str, $len): string {
     throw new \RuntimeException('Not allowed');
 };
 try { 
-    echo "After", PHP_EOL;
+    echo "After\n";
 } catch (\Throwable $exception) {
     // Do not output anything here, as handler is overridden
 } finally {
@@ -35,6 +35,15 @@ if (isset($exception)) {
     echo $exception->getMessage(), PHP_EOL;
 }
 ?>
---EXPECT--
+--EXPECTF--
 Before
-Not allowed
+
+Fatal error: Uncaught RuntimeException: Not allowed in %s:%d
+Stack trace:
+#0 %s(15): {closure}('After\n', 6)
+#1 {main}
+
+Next FFI\Exception: Uncaught RuntimeException in PHP FFI callback in %s:%d
+Stack trace:
+#0 {main}
+  thrown in %s on line %d