FIR Checker: check tailrec

Difference from FE1.0 * KT-4285: calls to virtual method with default argument should be reported as not tailrec. FE1.0 is missing such cases. * KT-48600: calls inside lambda should be reported as not tailrec. FE1.0 also misses such cases.
2021-09-02 11:00:45 -07:00
parent 5df316a129
commit 8525b4932b
55 changed files with 876 additions and 216 deletions
@@ -0,0 +1,53 @@
+object Foo {
+    tailrec fun foo1() {
+        foo1()
+    }
+
+    tailrec fun foo2() {
+        this.foo2()
+    }
+
+    <!NO_TAIL_CALLS_FOUND!>tailrec fun foo3()<!> {
+        Foo.<!NON_TAIL_RECURSIVE_CALL!>foo3<!>()
+    }
+}
+
+class Bar {
+    companion object {
+        tailrec fun bar1() {
+            bar1()
+        }
+
+        tailrec fun bar2() {
+            this.bar2()
+        }
+
+        <!NO_TAIL_CALLS_FOUND!>tailrec fun bar3()<!> {
+            Bar.<!NON_TAIL_RECURSIVE_CALL!>bar3<!>()
+        }
+
+        <!NO_TAIL_CALLS_FOUND!>tailrec fun bar4()<!> {
+            Bar.Companion.<!NON_TAIL_RECURSIVE_CALL!>bar4<!>()
+        }
+    }
+}
+
+enum class E {
+    A {
+        override tailrec fun rec() {
+            rec()
+        }
+    },
+    B {
+        override tailrec fun rec() {
+            this.rec()
+        }
+    },
+    C {
+        <!NO_TAIL_CALLS_FOUND!>override tailrec fun rec()<!> {
+            C.rec() // resolution goes to `E.rec`. Hence the resolved symbol is considered different from `C.rec`.
+        }
+    };
+
+    abstract fun rec()
+}