diff --git a/mkstructinfo.awk b/mkstructinfo.awk
index 423d216..2e460a8 100755
--- a/mkstructinfo.awk
+++ b/mkstructinfo.awk
@@ -49,10 +49,10 @@ incomment {
 			sizeinfo = sizeinfo "sizeof(((" instruct "*)NULL)->" buffer[i] ")";
 
 			if (i == 0) {
-				elms = buffer[i];
+				elms = "\"" buffer[i] "\"";
 			}
 			else {
-				elms = elms "," buffer[i];
+				elms = elms "," "\"" buffer[i] "\"";
 			}
 		}
 		printf "define(`ELEMENTSOF_%s', `%s')\n", instruct, elms;
diff --git a/processor/head.m4 b/processor/head.m4
index 78e8967..99500c3 100644
--- a/processor/head.m4
+++ b/processor/head.m4
@@ -305,6 +305,49 @@ static void xc_zend_extension_op_array_ctor_handler(zend_extension *extension, z
 	}
 }
 /* }}} */
+/* {{{ field name checker */
+IFASSERT(`dnl
+int xc_check_names(const char *file, int line, const char *functionName, const char **assert_names, int assert_names_count, HashTable *done_names)
+{
+	int errors = 0;
+	if (assert_names_count) {
+		int i;
+		Bucket *b;
+
+		for (i = 0; i < assert_names_count; ++i) {
+			if (!zend_hash_exists(done_names, assert_names[i], strlen(assert_names[i]) + 1)) {
+				fprintf(stderr
+					, "missing field at %s `#'%d %s`' : %s\n"
+					, file, line, functionName
+					, assert_names[i]
+					);
+				++errors;
+			}
+		}
+
+		for (b = done_names->pListHead; b != NULL; b = b->pListNext) {
+			int known = 0;
+			int i;
+			for (i = 0; i < assert_names_count; ++i) {
+				if (strcmp(assert_names[i], BUCKET_KEY_S(b)) == 0) {
+					known = 1;
+					break;
+				}
+			}
+			if (!known) {
+				fprintf(stderr
+					, "unknown field at %s `#'%d %s`' : %s\n"
+					, file, line, functionName
+					, BUCKET_KEY_S(b)
+					);
+				++errors;
+			}
+		}
+	}
+	return errors;
+}
+')
+/* }}} */
 dnl ================ export API
 define(`DEFINE_STORE_API', `
 /* export: $1 *xc_processor_store_$1($1 *src TSRMLS_DC); :export {{{ */
diff --git a/processor/main.m4 b/processor/main.m4
index bd1e5bd..9edb6a6 100644
--- a/processor/main.m4
+++ b/processor/main.m4
@@ -205,12 +205,25 @@ foreach(`i', `($1)', `popdef(`item_'defn(`i'))')dnl
 ')
 dnl }}}
 dnl {{{ DONE_*
-define(`DONE_SIZE', `IFASSERT(`
+define(`DONE_SIZE', `IFASSERT(`dnl
 	done_size += $1`';
 	done_count ++;
 ')')
 define(`DONE', `
-	define(`ELEMENTS_DONE', defn(`ELEMENTS_DONE')`,$1')
+	define(`ELEMENTS_DONE', defn(`ELEMENTS_DONE')`,"$1"')
+	IFASSERT(`dnl
+		if (zend_hash_exists(&done_names, "$1", sizeof("$1"))) {
+			fprintf(stderr
+				, "duplicate field at %s `#'%d FUNC_NAME`' : %s\n"
+				, __FILE__, __LINE__
+				, "$1"
+				);
+		}
+		else {
+			zend_uchar b = 1;
+			zend_hash_add(&done_names, "$1", sizeof("$1"), (void*)&b, sizeof(b), NULL);
+		}
+	')
 	DONE_SIZE(`sizeof(src->$1)')
 ')
 define(`DISABLECHECK', `
diff --git a/processor/struct.m4 b/processor/struct.m4
index c50705a..f606134 100644
--- a/processor/struct.m4
+++ b/processor/struct.m4
@@ -29,11 +29,10 @@ define(`DEF_STRUCT_P_FUNC', `
 DECL_STRUCT_P_FUNC(`$1', `$2', 1)
 	{
 		pushdef(`ELEMENTS_DONE')
-		ifdef(`SIZEOF_$1', , `m4_errprint(`AUTOCHECK WARN: $1: missing structinfo, dont panic')define(`SIZEOF_$1', 0)')
 		IFASSERT(`
 			/* {{{ init assert */
-			ifdef(`SIZEOF_$1', , `m4_errprint(`missing SIZEOF_$1, safe to ignore')define(`SIZEOF_$1', 0)')
-			ifdef(`COUNTOF_$1', , `m4_errprint(`missing COUNTOF_$1, safe to ignore')define(`COUNTOF_$1', 0)')
+			ifdef(`SIZEOF_$1', , `m4_errprint(`missing SIZEOF_$1, safe to ignore')')
+			ifdef(`COUNTOF_$1', , `m4_errprint(`missing COUNTOF_$1, safe to ignore'))')
 			dnl SIZEOF_x COUNTOF_x can be both defined or both not
 			ifdef(`SIZEOF_$1', `
 				ifdef(`COUNTOF_$1', , `m4_errprint(`AUTOCHECK WARN: missing COUNTOF_$1')')
@@ -47,11 +46,15 @@ DECL_STRUCT_P_FUNC(`$1', `$2', 1)
 			')
 			int assert_size = SIZEOF_$1, assert_count = COUNTOF_$1;
 			int done_size = 0, done_count = 0;
+			const char *assert_names[] = { ifdef(`ELEMENTSOF_$1', `ELEMENTSOF_$1') };
+			HashTable done_names;
+			zend_hash_init(&done_names, 0, NULL, NULL, 0);
 			/* }}} */
 			IFRESTORE(`assert(xc_is_shm(src));')
 			IFCALCSTORE(`assert(!xc_is_shm(src));')
 			do {
 		')
+		ifdef(`SIZEOF_$1', , `m4_errprint(`AUTOCHECK WARN: $1: missing structinfo, dont panic')')
 
 		ifdef(`USEMEMCPY', `IFCOPY(`
 			memcpy(dst, src, sizeof($1));
@@ -67,9 +70,17 @@ DECL_STRUCT_P_FUNC(`$1', `$2', 1)
 			indent --;
 			INDENT()fprintf(stderr, "}\n");
 		')
-		ifdef(`SKIPASSERT_ONCE', `undefine(`SKIPASSERT_ONCE')', `
+		ifdef(`SKIPASSERT_ONCE', `
+			undefine(`SKIPASSERT_ONCE')
 			IFASSERT(`
-				/* {{{ check assert */
+				zend_hash_destroy(&done_names);
+			')
+		', `
+			IFASSERT(`
+			/* {{{ check assert */ do {
+				int name_check_errors = xc_check_names(__FILE__, __LINE__, "FUNC_NAME", assert_names, sizeof(assert_names) / sizeof(assert_names[0]), &done_names);
+				zend_hash_destroy(&done_names);
+
 				if (done_count != assert_count) {
 					fprintf(stderr
 						, "count assertion failed at %s `#'%d FUNC_NAME`' : unexpected:%d - expecting:%d = %d != 0\n"
@@ -84,10 +95,10 @@ DECL_STRUCT_P_FUNC(`$1', `$2', 1)
 						, done_size, assert_size, done_size - assert_size
 						);
 				}
-				if (done_count != assert_count || done_size != assert_size) {
+				if (name_check_errors || done_count != assert_count || done_size != assert_size) {
 					assert(0);
 				}
-				/* }}} */
+			} while (0); /* }}} */
 			')
 			ifdef(`ELEMENTSOF_$1', `
 				pushdef(`ELEMENTS_UNDONE', LIST_DIFF(defn(`ELEMENTSOF_$1'), defn(`ELEMENTS_DONE')))