diff --git a/examples/fn.php b/examples/fn.php
new file mode 100644
index 00000000..7ffa5c46
--- /dev/null
+++ b/examples/fn.php
@@ -0,0 +1,10 @@
+<?php
+function fn_test_yeild()
+{
+    echo "第一次调用前\n";
+    yield 1;          // 产生值 1，并暂停
+    echo "两次调用之间\n";
+    yield 2;          // 产生值 2，并暂停
+    echo "最后一次调用后\n";
+    yield 3;
+}
\ No newline at end of file
diff --git a/examples/yield.php b/examples/yield.php
new file mode 100644
index 00000000..14196f2f
--- /dev/null
+++ b/examples/yield.php
@@ -0,0 +1,8 @@
+<?php
+
+function main()
+{
+    require __DIR__ . '/fn.php';
+    var_dump(fn_test_yeild());
+}
+
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 58d4a83a..614245b0 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -1471,10 +1471,21 @@ class CompilerBase extends \PhpAot\Core\Translator
         }
         if ($this->isClassConstFetch($arg)) {
             if ($this->isNameExpr($arg->class) and $this->isIdExpr($arg->name) and $this->parseIdentifier($arg->name) === 'class') {
-                return $this->getNamespacedClassName($this->parseIdentifier($arg->class));
+                $class = $this->parseIdentifier($arg->class);
+                if ($class === 'self') {
+                    $class = $this->class;
+                } elseif ($class === 'parent') {
+                    if (!$this->classDef || !$this->classDef->extends) {
+                        $this->fatalError($arg, 'Cannot use "parent" outside a class or class does not extend any class');
+                    }
+                    return $this->classDef->extends;
+                } elseif ($class === 'static') {
+                    $this->fatalError($arg, "'static::class' cannot be resolved at compile time, use a concrete class name or 'self::class'");
+                }
+                return $this->getNamespacedClassName($class);
             }
         }
-        return '';
+        $this->fatalError($arg, 'Only string literals or `ClassName::class` constant are supported');
     }
 
     protected function parseReturn(Node\Stmt\Return_ $v): string
@@ -4329,9 +4340,6 @@ class CompilerBase extends \PhpAot\Core\Translator
         }
         $receiver = $this->parseExpr($expr->args[0]->value);
         $className = $this->resolveClassNameArg($expr->args[1]->value);
-        if ($className === '') {
-            $this->fatalError($expr, 'The second parameter of objval() only supports string literals or `ClassName::class` constant');
-        }
         return 'php::toObject(' . $receiver . ', ' . $this->getClassEntryPtr($className) . ', true)';
     }
 
@@ -4341,9 +4349,6 @@ class CompilerBase extends \PhpAot\Core\Translator
             return 'php::toObject(' . $receiver . ')';
         }
         $className = $this->resolveClassNameArg($expr->args[0]->value);
-        if ($className === '') {
-            $this->fatalError($expr, 'The first parameter of toObject() only supports string literals or `ClassName::class` constant');
-        }
         return 'php::toObject(' . $receiver . ', ' . $this->getClassEntryPtr($className) . ', true)';
     }
 
diff --git a/tests/aot/class/objval-2.phpt b/tests/aot/class/objval-2.phpt
new file mode 100644
index 00000000..8ff33f23
--- /dev/null
+++ b/tests/aot/class/objval-2.phpt
@@ -0,0 +1,24 @@
+--TEST--
+objval
+--FILE--
+<?php
+
+class Foo {
+    public function run($obj) {
+        $o = objval($obj, self::class);
+        $o->bar();
+    }
+
+    public function bar() {
+        var_dump(__METHOD__);
+    }
+}
+
+function main() {
+    $o = new Foo();
+    $o->run($o);
+}
+
+?>
+--EXPECT--
+string(8) "Foo::bar"
diff --git a/tests/aot/class/objval-parent.phpt b/tests/aot/class/objval-parent.phpt
new file mode 100644
index 00000000..ceeb8a02
--- /dev/null
+++ b/tests/aot/class/objval-parent.phpt
@@ -0,0 +1,32 @@
+--TEST--
+objval with parent::class
+--FILE--
+<?php
+
+class Base {
+    public function name(): string {
+        return 'Base';
+    }
+}
+
+class Child extends Base {
+    public function name(): string {
+        return 'Child';
+    }
+
+    public function castToParent($obj): Base {
+        return objval($obj, parent::class);
+    }
+}
+
+function main() {
+    $b = new Base();
+    $c = new Child();
+
+    $result = $c->castToParent($b);
+    var_dump($result->name());
+}
+
+?>
+--EXPECT--
+string(4) "Base"
diff --git a/version.txt b/version.txt
index 2a698458..373aef1e 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1063
\ No newline at end of file
+1064