Fix preloading of constants containing enums

Fixes GH-8133

NEWS

@@ -5,6 +5,8 @@ PHP                                                                        NEWS
 - Core:
   . Fixed bug GH-8310 (Registry settings are no longer recognized). (cmb)
   . Fixed potential race condition during resource ID allocation. (ryancaicse)
+  . Fixed bug GH-8133 (Preloading of constants containing arrays with enums
+    segfaults). (ilutov)
 
 - Date:
   . Fixed bug GH-7752 (DateTimeZone::getTransitions() returns insufficient

Zend/zend_ast.c

@@ -750,6 +750,12 @@ ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate(zval *result, zend_ast *ast
 			break;
 		case ZEND_AST_CONST_ENUM_INIT:
 		{
+			// Preloading will attempt to resolve constants but objects can't be stored in shm
+			// Aborting here to store the const AST instead
+			if (CG(in_compilation)) {
+				return FAILURE;
+			}
+
 			zend_ast *class_name_ast = ast->child[0];
 			zend_string *class_name = zend_ast_get_str(class_name_ast);
 
@@ -762,13 +768,6 @@ ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate(zval *result, zend_ast *ast
 				: NULL;
 
 			zend_class_entry *ce = zend_lookup_class(class_name);
-			if (!ce) {
-				/* Class may not be available when resolving constants on a dynamically
-				 * declared enum during preloading. */
-				ZEND_ASSERT(CG(compiler_options) & ZEND_COMPILE_PRELOAD);
-				return FAILURE;
-			}
-
 			zend_enum_new(result, ce, case_name, case_value_zv);
 			break;
 		}

ext/opcache/ZendAccelerator.c

@@ -3725,19 +3725,6 @@ static zend_result preload_resolve_deps(preload_error *error, const zend_class_e
 	return SUCCESS;
 }
 
-static zend_result preload_update_constant(zval *val, zend_class_entry *scope)
-{
-	zval tmp;
-	ZVAL_COPY(&tmp, val);
-	if (zval_update_constant_ex(&tmp, scope) == FAILURE || Z_TYPE(tmp) == IS_OBJECT) {
-		zval_ptr_dtor(&tmp);
-		return FAILURE;
-	}
-	zval_ptr_dtor_nogc(val);
-	ZVAL_COPY_VALUE(val, &tmp);
-	return SUCCESS;
-}
-
 static bool preload_try_resolve_constants(zend_class_entry *ce)
 {
 	bool ok, changed, was_changed = 0;
@@ -3751,7 +3738,7 @@ static bool preload_try_resolve_constants(zend_class_entry *ce)
 		ZEND_HASH_FOREACH_PTR(&ce->constants_table, c) {
 			val = &c->value;
 			if (Z_TYPE_P(val) == IS_CONSTANT_AST) {
-				if (EXPECTED(preload_update_constant(val, c->ce) == SUCCESS)) {
+				if (EXPECTED(zval_update_constant_ex(val, c->ce) == SUCCESS)) {
 					was_changed = changed = 1;
 				} else {
 					ok = 0;
@@ -3769,7 +3756,7 @@ static bool preload_try_resolve_constants(zend_class_entry *ce)
 				val = &ce->default_properties_table[i];
 				if (Z_TYPE_P(val) == IS_CONSTANT_AST) {
 					zend_property_info *prop = ce->properties_info_table[i];
-					if (UNEXPECTED(preload_update_constant(val, prop->ce) != SUCCESS)) {
+					if (UNEXPECTED(zval_update_constant_ex(val, prop->ce) != SUCCESS)) {
 						resolved = ok = 0;
 					}
 				}
@@ -3785,7 +3772,7 @@ static bool preload_try_resolve_constants(zend_class_entry *ce)
 			val = ce->default_static_members_table + ce->default_static_members_count - 1;
 			while (count) {
 				if (Z_TYPE_P(val) == IS_CONSTANT_AST) {
-					if (UNEXPECTED(preload_update_constant(val, ce) != SUCCESS)) {
+					if (UNEXPECTED(zval_update_constant_ex(val, ce) != SUCCESS)) {
 						resolved = ok = 0;
 					}
 				}

ext/opcache/tests/gh8133.inc

@@ -0,0 +1,12 @@
+<?php
+
+enum Foo
+{
+    case Bar;
+    case Baz;
+    const CASES = [Foo::Bar, Foo::Baz];
+}
+
+class Qux {
+    const CASES = [Foo::Bar, Foo::Baz];
+}

ext/opcache/tests/gh8133.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Enum preloading
+--EXTENSIONS--
+opcache
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+opcache.preload={PWD}/gh8133.inc
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');
+?>
+--FILE--
+<?php
+
+var_dump(Foo::CASES);
+var_dump(Qux::CASES);
+
+?>
+--EXPECT--
+array(2) {
+  [0]=>
+  enum(Foo::Bar)
+  [1]=>
+  enum(Foo::Baz)
+}
+array(2) {
+  [0]=>
+  enum(Foo::Bar)
+  [1]=>
+  enum(Foo::Baz)
+}