Merge pull request #11310 from tamasvajk/kotlin-dead-code

Kotlin: Exclude .kt files from dead code queries

java/ql/src/DeadCode/DeadClass.ql

@@ -14,6 +14,8 @@ import semmle.code.java.deadcode.DeadCode
 
 from DeadClass c, Element origin, string reason
 where
+  not c.getFile().isKotlinSourceFile() and
+  not origin.getFile().isKotlinSourceFile() and
   if exists(DeadRoot root | root = c.getADeadRoot() | not root = c.getACallable())
   then (
     // Report a list of the dead roots.

java/ql/src/DeadCode/DeadField.ql

@@ -15,6 +15,8 @@ import semmle.code.java.deadcode.DeadCode
 
 from DeadField f, Element origin, string reason
 where
+  not f.getFile().isKotlinSourceFile() and
+  not origin.getFile().isKotlinSourceFile() and
   not f.isInDeadScope() and
   if f.getAnAccess() instanceof FieldRead
   then (

java/ql/src/DeadCode/DeadMethod.ql

@@ -15,6 +15,8 @@ import semmle.code.java.deadcode.DeadCode
 
 from DeadMethod c, Callable origin, string reason
 where
+  not c.getFile().isKotlinSourceFile() and
+  not origin.getFile().isKotlinSourceFile() and
   not c.isInDeadScope() and
   if exists(DeadRoot deadRoot | deadRoot = getADeadRoot(c) | deadRoot.getSourceDeclaration() != c)
   then (

java/ql/test/kotlin/query-tests/DeadCode/DeadClass.qlref

@@ -0,0 +1 @@
+DeadCode/DeadClass.ql

java/ql/test/kotlin/query-tests/DeadCode/DeadMethod.qlref

@@ -0,0 +1 @@
+DeadCode/DeadMethod.ql

java/ql/test/kotlin/query-tests/DeadCode/Test.kt

@@ -0,0 +1,31 @@
+sealed interface DbAddexpr
+
+class Label<T> {
+}
+
+fun <T> getFreshIdLabel(): Label<T> {
+    return Label()
+}
+
+fun foo(): Label<DbAddexpr> {
+    val x = getFreshIdLabel<DbAddexpr>()
+    return x
+}
+
+fun main1() {
+    print(foo())
+}
+
+class Foo {
+    data class DC(val x: Int, val y: Int)
+
+    fun foo() {
+        val dc = DC(3, 4)
+        print(dc.x)
+        print(dc.y)
+    }
+}
+
+fun main2() {
+    Foo().foo()
+}