Preloading: Prevent autoloading while resolving constants

ext/opcache/ZendAccelerator.c

@@ -3414,6 +3414,7 @@ static zend_bool preload_try_resolve_constants(zend_class_entry *ce)
 	zval *val;
 
 	EG(exception) = (void*)(uintptr_t)-1; /* prevent error reporting */
+	CG(in_compilation) = 1; /* prevent autoloading */
 	do {
 		ok = 1;
 		changed = 0;
@@ -3455,6 +3456,7 @@ static zend_bool preload_try_resolve_constants(zend_class_entry *ce)
 		}
 	} while (changed && !ok);
 	EG(exception) = NULL;
+	CG(in_compilation) = 0;
 
 	return ok;
 }

ext/opcache/tests/preload_012.phpt

@@ -0,0 +1,14 @@
+--TEST--
+No autoloading during constant resolution
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+opcache.preload={PWD}/preload_const_autoload.inc
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+===DONE===
+--EXPECTF--
+Warning: Can't preload class Test with unresolved initializer for constant C in %s on line %d
+===DONE===

ext/opcache/tests/preload_const_autoload.inc

@@ -0,0 +1,7 @@
+<?php
+
+spl_autoload_register(function($class) {
+    var_dump($class);
+    new Abc;
+});
+opcache_compile_file('preload_const_autoload_2.inc');

ext/opcache/tests/preload_const_autoload_2.inc

@@ -0,0 +1,5 @@
+<?php
+
+class Test {
+    const C = Foo::BAR;
+}