Define visibility flags for namespace-scoped members

Add flag definitions for the upcoming private(namespace) visibility feature:
- ZEND_ACC_NAMESPACE_PRIVATE (bit 30): Primary visibility for methods/properties
- ZEND_ACC_NAMESPACE_PRIVATE_SET (bit 13): Asymmetric visibility for property writes

Also updates visibility masks and conversion functions to include the new flags.

These flags will be set by the parser and checked at runtime during
method/property access.

Author: withinboredom

Zend/zend_compile.h

@@ -221,6 +221,9 @@ typedef struct _zend_oparray_context {
 #define ZEND_ACC_PROTECTED               (1 <<  1) /*     |  X  |  X  |  X  */
 #define ZEND_ACC_PRIVATE                 (1 <<  2) /*     |  X  |  X  |  X  */
 /*                                                        |     |     |     */
+/* Namespace-scoped visibility                            |     |     |     */
+#define ZEND_ACC_NAMESPACE_PRIVATE       (1 << 30) /*     |  X  |  X  |     */
+/*                                                        |     |     |     */
 /* Property or method overrides private one               |     |     |     */
 #define ZEND_ACC_CHANGED                 (1 <<  3) /*     |  X  |  X  |     */
 /*                                                        |     |     |     */
@@ -274,6 +277,7 @@ typedef struct _zend_oparray_context {
 #define ZEND_ACC_PUBLIC_SET              (1 << 10) /*     |     |  X  |     */
 #define ZEND_ACC_PROTECTED_SET           (1 << 11) /*     |     |  X  |     */
 #define ZEND_ACC_PRIVATE_SET             (1 << 12) /*     |     |  X  |     */
+#define ZEND_ACC_NAMESPACE_PRIVATE_SET   (1 << 13) /*     |     |  X  |     */
 /*                                                        |     |     |     */
 /* Class Flags (unused: 31)                               |     |     |     */
 /* ===========                                            |     |     |     */
@@ -418,8 +422,8 @@ typedef struct _zend_oparray_context {
 /*                                                        |     |     |     */
 /* #define ZEND_ACC2_EXAMPLE             (1 << 0)         |  X  |     |     */
 
-#define ZEND_ACC_PPP_MASK  (ZEND_ACC_PUBLIC | ZEND_ACC_PROTECTED | ZEND_ACC_PRIVATE)
-#define ZEND_ACC_PPP_SET_MASK  (ZEND_ACC_PUBLIC_SET | ZEND_ACC_PROTECTED_SET | ZEND_ACC_PRIVATE_SET)
+#define ZEND_ACC_PPP_MASK  (ZEND_ACC_PUBLIC | ZEND_ACC_PROTECTED | ZEND_ACC_PRIVATE | ZEND_ACC_NAMESPACE_PRIVATE)
+#define ZEND_ACC_PPP_SET_MASK  (ZEND_ACC_PUBLIC_SET | ZEND_ACC_PROTECTED_SET | ZEND_ACC_PRIVATE_SET | ZEND_ACC_NAMESPACE_PRIVATE_SET)
 
 static zend_always_inline uint32_t zend_visibility_to_set_visibility(uint32_t visibility)
 {
@@ -430,6 +434,8 @@ static zend_always_inline uint32_t zend_visibility_to_set_visibility(uint32_t vi
 			return ZEND_ACC_PROTECTED_SET;
 		case ZEND_ACC_PRIVATE:
 			return ZEND_ACC_PRIVATE_SET;
+		case ZEND_ACC_NAMESPACE_PRIVATE:
+			return ZEND_ACC_NAMESPACE_PRIVATE_SET;
 		EMPTY_SWITCH_DEFAULT_CASE();
 	}
 }

Zend/zend_inheritance.c

@@ -204,6 +204,8 @@ const char *zend_visibility_string(uint32_t fn_flags) /* {{{ */
 {
 	if (fn_flags & ZEND_ACC_PUBLIC) {
 		return "public";
+	} else if (fn_flags & ZEND_ACC_NAMESPACE_PRIVATE) {
+		return "private(namespace)";
 	} else if (fn_flags & ZEND_ACC_PRIVATE) {
 		return "private";
 	} else {
@@ -215,7 +217,9 @@ const char *zend_visibility_string(uint32_t fn_flags) /* {{{ */
 
 static const char *zend_asymmetric_visibility_string(uint32_t fn_flags) /* {{{ */
 {
-	if (fn_flags & ZEND_ACC_PRIVATE_SET) {
+	if (fn_flags & ZEND_ACC_NAMESPACE_PRIVATE_SET) {
+		return "private(namespace)(set)";
+	} else if (fn_flags & ZEND_ACC_PRIVATE_SET) {
 		return "private(set)";
 	} else if (fn_flags & ZEND_ACC_PROTECTED_SET) {
 		return "protected(set)";