[JS IR] Optimize away upcasts

#KT-50212 Fixed
2021-12-20 18:33:47 +03:00
parent 400a5a0f34
commit 8149189585
7 changed files with 217 additions and 10 deletions
@@ -0,0 +1,150 @@
+// EXPECTED_REACHABLE_NODES: 1306
+
+// Test that upcasts are optimized away
+
+open class Base
+
+class Derived: Base()
+
+var counter = 0
+var _derived = Derived()
+
+@JsExport
+fun getDerived(): Derived {
+    counter += 1
+    return _derived
+}
+
+@JsExport
+fun getDerivedNullable(): Derived? {
+    counter += 1
+    return _derived
+}
+
+@JsExport
+fun getDerivedNull(): Derived? {
+    counter += 1
+    return null
+}
+
+// CHECK_CONTAINS_NO_CALLS: upcast1 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=upcast1 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast1() = getDerived() as Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast2 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast2 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast2 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=upcast2 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast2() = getDerived() as Base?
+
+// CHECK_BINOP_COUNT: function=upcast3 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast3() = getDerivedNullable() as Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast4 except=getDerivedNullable IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=upcast1 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast4() = getDerivedNullable() as Base?
+
+// CHECK_BINOP_COUNT: function=upcast5 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast5() = getDerivedNull() as Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast6 except=getDerivedNull IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=upcast6 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun upcast6() = getDerivedNull() as Base?
+
+// CHECK_CONTAINS_NO_CALLS: safeCast1 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=safeCast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=safeCast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=safeCast1 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast1() = getDerived() as? Base
+
+// CHECK_CONTAINS_NO_CALLS: safeCast2 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=safeCast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=safeCast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=safeCast2 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast2() = getDerived() as? Base?
+
+// CHECK_BINOP_COUNT: function=safeCast3 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast3() = getDerivedNullable() as? Base
+
+// CHECK_CONTAINS_NO_CALLS: safeCast4 except=getDerivedNullable IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=safeCast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=safeCast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=safeCast4 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast4() = getDerivedNullable() as? Base?
+
+// CHECK_BINOP_COUNT: function=safeCast5 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast5() = getDerivedNull() as? Base
+
+// CHECK_CONTAINS_NO_CALLS: safeCast6 except=getDerivedNull IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=safeCast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=safeCast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=safeCast6 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun safeCast6() = getDerivedNull() as? Base?
+
+// CHECK_CONTAINS_NO_CALLS: upcast1 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast1 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=instanceCheck1 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck1() = getDerived() is Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast2 except=getDerived IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast2 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast2 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=instanceCheck2 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck2() = getDerived() is Base?
+
+// CHECK_BINOP_COUNT: function=instanceCheck3 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck3() = getDerivedNullable() is Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast4 except=getDerivedNullable IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast4 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=instanceCheck4 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck4() = getDerivedNullable() is Base?
+
+// CHECK_BINOP_COUNT: function=instanceCheck5 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck5() = getDerivedNull() is Base
+
+// CHECK_CONTAINS_NO_CALLS: upcast6 except=getDerivedNull IGNORED_BACKENDS=JS
+// CHECK_TERNARY_OPERATOR_COUNT: function=upcast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_IF_COUNT: function=upcast6 count=0 IGNORED_BACKENDS=JS
+// CHECK_BINOP_COUNT: function=instanceCheck6 count=0 symbol=instanceof IGNORED_BACKENDS=JS
+fun instanceCheck6() = getDerivedNull() is Base?
+
+fun box(): String {
+    assertSame(_derived, upcast1(), "upcast1()")
+    assertSame(_derived, upcast2(), "upcast2()")
+    assertSame(_derived, upcast3(), "upcast3()")
+    assertSame(_derived, upcast4(), "upcast4()")
+    failsClassCast("upcast5()") { upcast5() }
+    assertSame(null, upcast6(), "upcast6()")
+    assertEquals(6, counter)
+
+    counter = 0
+
+    assertSame(_derived, safeCast1(), "safeCast1()")
+    assertSame(_derived, safeCast2(), "safeCast2()")
+    assertSame(_derived, safeCast3(), "safeCast3()")
+    assertSame(_derived, safeCast4(), "safeCast4()")
+    assertSame(null,     safeCast5(), "safeCast5()")
+    assertSame(null,     safeCast6(), "safeCast6()")
+    assertEquals(6, counter)
+
+    counter = 0
+
+    assertTrue(instanceCheck1(), "instanceCheck1()")
+    assertTrue(instanceCheck2(), "instanceCheck2()")
+    assertTrue(instanceCheck3(), "instanceCheck3()")
+    assertTrue(instanceCheck4(), "instanceCheck4()")
+    assertFalse(instanceCheck5(), "instanceCheck5()")
+    assertTrue(instanceCheck6(), "instanceCheck6()")
+    assertEquals(6, counter)
+
+    return "OK"
+}