Allow optimizer to depend on preloaded symbols

It is safe for the optimizer to rely on preloaded symbols. This can occur when
compiling non-preloaded files, referencing preloaded ones.

Author: iluuu1994

Zend/Optimizer/zend_optimizer.c

@@ -803,6 +803,7 @@ zend_class_entry *zend_optimizer_get_class_entry(
 	ce = zend_hash_find_ptr(CG(class_table), lcname);
 	if (ce
 	 && (ce->type == ZEND_INTERNAL_CLASS
+	  || (ce->ce_flags & ZEND_ACC_PRELOADED)
 	  || (op_array && ce->info.user.filename == op_array->filename))) {
 		return ce;
 	}
@@ -847,11 +848,9 @@ const zend_class_constant *zend_fetch_class_const_info(
 			} else {
 				zend_class_entry *tmp = zend_hash_find_ptr(EG(class_table), Z_STR_P(op1 + 1));
 				if (tmp != NULL) {
-					if (tmp->type == ZEND_INTERNAL_CLASS) {
-						ce = tmp;
-					} else if (tmp->type == ZEND_USER_CLASS
-						&& tmp->info.user.filename
-						&& tmp->info.user.filename == op_array->filename) {
+					if (tmp->type == ZEND_INTERNAL_CLASS
+					 || (tmp->ce_flags & ZEND_ACC_PRELOADED)
+					 || (tmp->info.user.filename && tmp->info.user.filename == op_array->filename)) {
 						ce = tmp;
 					}
 				}
@@ -903,9 +902,9 @@ zend_function *zend_optimizer_get_called_func(
 			} else if ((func = zend_hash_find_ptr(EG(function_table), function_name)) != NULL) {
 				if (func->type == ZEND_INTERNAL_FUNCTION) {
 					return func;
-				} else if (func->type == ZEND_USER_FUNCTION &&
-				           func->op_array.filename &&
-				           func->op_array.filename == op_array->filename) {
+				} else if (func->type == ZEND_USER_FUNCTION
+				 && ((func->op_array.fn_flags & ZEND_ACC_PRELOADED)
+				  || (func->op_array.filename && func->op_array.filename == op_array->filename))) {
 					return func;
 				}
 			}
@@ -921,9 +920,9 @@ zend_function *zend_optimizer_get_called_func(
 				} else if ((func = zend_hash_find_ptr(EG(function_table), Z_STR_P(function_name))) != NULL) {
 					if (func->type == ZEND_INTERNAL_FUNCTION) {
 						return func;
-					} else if (func->type == ZEND_USER_FUNCTION &&
-					           func->op_array.filename &&
-					           func->op_array.filename == op_array->filename) {
+					} else if (func->type == ZEND_USER_FUNCTION
+					 && ((func->op_array.fn_flags & ZEND_ACC_PRELOADED)
+					  || (func->op_array.filename && func->op_array.filename == op_array->filename))) {
 						return func;
 					}
 				}

ext/opcache/tests/preload_optimizer.inc

@@ -0,0 +1,5 @@
+<?php
+
+function foo() {
+    return 42;
+}

ext/opcache/tests/preload_optimizer.phpt

@@ -0,0 +1,43 @@
+--TEST--
+Optimizer may rely on preloaded symbols
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.preload={PWD}/preload_optimizer.inc
+opcache.opt_debug_level=0x20000
+--EXTENSIONS--
+opcache
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');
+?>
+--FILE--
+<?php
+echo foo();
+?>
+--EXPECTF--
+$_main:
+     ; (lines=1, args=0, vars=0, tmps=%d)
+     ; (after optimizer)
+     ; $PRELOAD$:0-0
+0000 RETURN null
+
+foo:
+     ; (lines=1, args=0, vars=0, tmps=%d)
+     ; (after optimizer)
+     ; %spreload_optimizer.inc:3-5
+0000 RETURN int(42)
+
+$_main:
+     ; (lines=1, args=0, vars=0, tmps=%d)
+     ; (after optimizer)
+     ; %spreload_optimizer.inc:1-6
+0000 RETURN int(1)
+
+$_main:
+     ; (lines=2, args=0, vars=0, tmps=%d)
+     ; (after optimizer)
+     ; %spreload_optimizer.php:1-4
+0000 ECHO string("42")
+0001 RETURN int(1)
+42