Support smart casts to Type after x as? Type null check #KT-4565 Fixed

2017-08-10 15:47:59 +03:00
parent 5bd04a6d22
commit 80b6aaa802
14 changed files with 318 additions and 22 deletions
@@ -0,0 +1,67 @@
+// !LANGUAGE: +SafeCastCheckBoundSmartCasts
+interface SomeClass {
+    val data: Any?
+}
+
+interface SomeSubClass : SomeClass {
+    val foo: Any?
+}
+
+object Impl : SomeSubClass {
+    override val data = ""
+    override val foo = 42
+}
+
+fun g(a: SomeClass?) {
+    var b = <!VARIABLE_WITH_REDUNDANT_INITIALIZER!>(a as? SomeSubClass)?.foo<!>
+    b = "Hello"
+    if (<!SENSELESS_COMPARISON!>b != null<!>) {
+        // 'a' cannot be cast to SomeSubClass!
+        a<!UNSAFE_CALL!>.<!>hashCode()
+        a.<!UNRESOLVED_REFERENCE!>foo<!>
+        (a as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
+        (a as SomeSubClass).foo
+    }
+    var c = <!VARIABLE_WITH_REDUNDANT_INITIALIZER!>a as? SomeSubClass<!>
+    c = Impl
+    if (<!SENSELESS_COMPARISON!>c != null<!>) {
+        // 'a' cannot be cast to SomeSubClass
+        a<!UNSAFE_CALL!>.<!>hashCode()
+        a.<!UNRESOLVED_REFERENCE!>foo<!>
+        (a as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
+        <!DEBUG_INFO_SMARTCAST!>c<!>.hashCode()
+        <!DEBUG_INFO_SMARTCAST!>c<!>.foo
+    }
+}
+
+fun f(a: SomeClass?) {
+    var aa = a
+
+    if (aa as? SomeSubClass != null) {
+        aa = null
+        // 'aa' cannot be cast to SomeSubClass
+        <!DEBUG_INFO_CONSTANT!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
+        aa.<!UNRESOLVED_REFERENCE!>foo<!>
+        (<!DEBUG_INFO_CONSTANT!>aa<!> as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
+        (<!ALWAYS_NULL!>aa<!> as SomeSubClass).foo
+    }
+    val b = (aa as? SomeSubClass)?.foo
+    aa = null
+    if (b != null) {
+        // 'aa' cannot be cast to SomeSubClass
+        <!DEBUG_INFO_CONSTANT!>aa<!><!UNSAFE_CALL!>.<!>hashCode()
+        aa.<!UNRESOLVED_REFERENCE!>foo<!>
+        (<!DEBUG_INFO_CONSTANT!>aa<!> as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
+        (<!ALWAYS_NULL!>aa<!> as SomeSubClass).foo
+    }
+    aa = a
+    val c = aa as? SomeSubClass
+    if (c != null) {
+        // 'c' can be cast to SomeSubClass
+        aa<!UNSAFE_CALL!>.<!>hashCode()
+        aa.<!UNRESOLVED_REFERENCE!>foo<!>
+        (aa as? SomeSubClass)<!UNSAFE_CALL!>.<!>foo
+        <!DEBUG_INFO_SMARTCAST!>c<!>.hashCode()
+        <!DEBUG_INFO_SMARTCAST!>c<!>.foo
+    }
+}