Refactor register shutdown function mechanism

Use FCI/FCC structure instead of custom implementation which does the same.
This also fixes the "bug" which prevented static methods from being shutdown functions.

Closes GH-5829

Co-authored-by: Aaron Piotrowski <aaron@trowski.com>

Zend/tests/bug41026.phpt

@@ -12,7 +12,7 @@ class try_class
 
     static public function on_shutdown ()
     {
-        printf ("CHECKPOINT\n"); /* never reached */
+        printf ("CHECKPOINT\n");
     }
 }
 
@@ -22,5 +22,4 @@ echo "Done\n";
 ?>
 --EXPECT--
 Done
-
-Fatal error: Registered shutdown function self::on_shutdown() cannot be called, function does not exist in Unknown on line 0
+CHECKPOINT

ext/session/session.c

@@ -2047,13 +2047,18 @@ PHP_FUNCTION(session_set_save_handler)
 		if (register_shutdown) {
 			/* create shutdown function */
 			php_shutdown_function_entry shutdown_function_entry;
-			ZVAL_STRING(&shutdown_function_entry.function_name, "session_register_shutdown");
-			shutdown_function_entry.arg_count = 0;
-			shutdown_function_entry.arguments = NULL;
+			zval callable;
+			zend_result result;
+
+			ZVAL_STRING(&callable, "session_register_shutdown");
+			result = zend_fcall_info_init(&callable, 0, &shutdown_function_entry.fci,
+				&shutdown_function_entry.fci_cache, NULL, NULL);
+
+			ZEND_ASSERT(result == SUCCESS);
 
 			/* add shutdown function, removing the old one if it exists */
 			if (!register_user_shutdown_function("session_shutdown", sizeof("session_shutdown") - 1, &shutdown_function_entry)) {
-				zval_ptr_dtor(&shutdown_function_entry.function_name);
+				zval_ptr_dtor(&callable);
 				php_error_docref(NULL, E_WARNING, "Unable to register session shutdown function");
 				RETURN_FALSE;
 			}
@@ -2654,6 +2659,8 @@ PHP_FUNCTION(session_status)
 PHP_FUNCTION(session_register_shutdown)
 {
 	php_shutdown_function_entry shutdown_function_entry;
+	zval callable;
+	zend_result result;
 
 	ZEND_PARSE_PARAMETERS_NONE();
 
@@ -2663,13 +2670,14 @@ PHP_FUNCTION(session_register_shutdown)
 	 * function after calling session_set_save_handler(), which expects
 	 * the session still to be available.
 	 */
+	ZVAL_STRING(&callable, "session_write_close");
+	result = zend_fcall_info_init(&callable, 0, &shutdown_function_entry.fci,
+		&shutdown_function_entry.fci_cache, NULL, NULL);
 
-	ZVAL_STRING(&shutdown_function_entry.function_name, "session_write_close");
-	shutdown_function_entry.arg_count = 0;
-	shutdown_function_entry.arguments = NULL;
+	ZEND_ASSERT(result == SUCCESS);
 
 	if (!append_user_shutdown_function(&shutdown_function_entry)) {
-		zval_ptr_dtor(&shutdown_function_entry.function_name);
+		zval_ptr_dtor(&callable);
 
 		/* Unable to register shutdown function, presumably because of lack
 		 * of memory, so flush the session now. It would be done in rshutdown

ext/standard/basic_functions.c

@@ -1664,14 +1664,10 @@ PHP_FUNCTION(forward_static_call_array)
 
 void user_shutdown_function_dtor(zval *zv) /* {{{ */
 {
-	int i;
 	php_shutdown_function_entry *shutdown_function_entry = Z_PTR_P(zv);
 
-	zval_ptr_dtor(&shutdown_function_entry->function_name);
-	for (i = 0; i < shutdown_function_entry->arg_count; i++) {
-		zval_ptr_dtor(&shutdown_function_entry->arguments[i]);
-	}
-	efree(shutdown_function_entry->arguments);
+	zval_ptr_dtor(&shutdown_function_entry->fci.function_name);
+	zend_fcall_info_args_clear(&shutdown_function_entry->fci, true);
 	efree(shutdown_function_entry);
 }
 /* }}} */
@@ -1687,22 +1683,14 @@ static int user_shutdown_function_call(zval *zv) /* {{{ */
 {
 	php_shutdown_function_entry *shutdown_function_entry = Z_PTR_P(zv);
 	zval retval;
+	zend_result call_status;
 
-	if (!zend_is_callable(&shutdown_function_entry->function_name, 0, NULL)) {
-		zend_string *function_name = zend_get_callable_name(&shutdown_function_entry->function_name);
-		zend_throw_error(NULL, "Registered shutdown function %s() cannot be called, function does not exist", ZSTR_VAL(function_name));
-		zend_string_release(function_name);
-		return 0;
-	}
-
-	if (call_user_function(NULL, NULL,
-				&shutdown_function_entry->function_name,
-				&retval,
-				shutdown_function_entry->arg_count,
-				shutdown_function_entry->arguments) == SUCCESS)
-	{
+	/* set retval zval for FCI struct */
+	shutdown_function_entry->fci.retval = &retval;
+	call_status = zend_call_function(&shutdown_function_entry->fci, &shutdown_function_entry->fci_cache);
+	ZEND_ASSERT(call_status == SUCCESS);
 	zval_ptr_dtor(&retval);
-	}
+
 	return 0;
 }
 /* }}} */
@@ -1761,8 +1749,7 @@ PHPAPI void php_call_shutdown_functions(void) /* {{{ */
 	if (BG(user_shutdown_function_names)) {
 		zend_try {
 			zend_hash_apply(BG(user_shutdown_function_names), user_shutdown_function_call);
-		}
-		zend_end_try();
+		} zend_end_try();
 	}
 }
 /* }}} */
@@ -1786,23 +1773,19 @@ PHPAPI void php_free_shutdown_functions(void) /* {{{ */
 PHP_FUNCTION(register_shutdown_function)
 {
 	php_shutdown_function_entry entry;
-	zend_fcall_info fci;
-	zend_fcall_info_cache fcc;
-	zval *args;
-	int arg_count = 0;
+	zval *params = NULL;
+	uint32_t param_count = 0;
+	bool status;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "f*", &fci, &fcc, &args, &arg_count) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "f*", &entry.fci, &entry.fci_cache, &params, &param_count) == FAILURE) {
 		RETURN_THROWS();
 	}
 
-	ZVAL_COPY(&entry.function_name, &fci.function_name);
-	entry.arguments = (zval *) safe_emalloc(sizeof(zval), arg_count, 0);
-	entry.arg_count = arg_count;
-	for (int i = 0; i < arg_count; i++) {
-		ZVAL_COPY(&entry.arguments[i], &args[i]);
-	}
+	Z_TRY_ADDREF(entry.fci.function_name);
+	zend_fcall_info_argp(&entry.fci, param_count, params);
 
-	append_user_shutdown_function(&entry);
+	status = append_user_shutdown_function(&entry);
+	ZEND_ASSERT(status);
 }
 /* }}} */
 

ext/standard/basic_functions.h

@@ -143,9 +143,8 @@ PHPAPI double php_get_nan(void);
 PHPAPI double php_get_inf(void);
 
 typedef struct _php_shutdown_function_entry {
-	zval function_name;
-	zval *arguments;
-	int arg_count;
+	zend_fcall_info fci;
+	zend_fcall_info_cache fci_cache;
 } php_shutdown_function_entry;
 
 PHPAPI extern bool register_user_shutdown_function(const char *function_name, size_t function_len, php_shutdown_function_entry *shutdown_function_entry);

ext/standard/tests/general_functions/010.phpt

@@ -12,7 +12,7 @@ class test {
 }
 
 try {
-    register_shutdown_function(array("test","__call"));
+    var_dump(register_shutdown_function(array("test","__call")));
 } catch (TypeError $exception) {
     echo $exception->getMessage() . "\n";
 }