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Kotlin: Fix extraction of dispatch and extension receivers

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It is possible for a call to have both, e.g. the `arg.ext()` call in:

class Class1 {
    val y = 4
}
class Class2 (val arg:Class1) {
    val x = 3
    fun someFun() {
        arg.ext();
    }
    fun Class1.ext() {
        val z = x + y
    }
}
This commit is contained in:
Ian Lynagh
2021-11-29 12:58:03 +00:00
parent 76d7ac9898
commit 75e22da096
2 changed files with 11 additions and 11 deletions
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7
java/ql/lib/semmle/code/java/Expr.qll
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@@ -1741,6 +1741,9 @@ class MethodAccess extends Expr, Call, @methodaccess {
/** Holds if this method access has a qualifier. */
predicate hasQualifier() { exists(this.getQualifier()) }
/** Gets the extension receiver expression of this method access, if any. */
Expr getExtensionReceiver() { result.isNthChildOf(this, -2) }
/** Gets an argument supplied to the method that is invoked using this method access. */
override Expr getAnArgument() { result.getIndex() >= 0 and result.getParent() = this }
@@ -1748,12 +1751,12 @@ class MethodAccess extends Expr, Call, @methodaccess {
override Expr getArgument(int index) { exprs(result, _, _, _, this, index) and index >= 0 }
/** Gets a type argument supplied as part of this method access, if any. */
Expr getATypeArgument() { result.getIndex() <= -2 and result.getParent() = this }
Expr getATypeArgument() { result.getIndex() <= -3 and result.getParent() = this }
/** Gets the type argument at the specified (zero-based) position in this method access, if any. */
Expr getTypeArgument(int index) {
result = this.getATypeArgument() and
(-2 - result.getIndex()) = index
(-3 - result.getIndex()) = index
}
/** Gets the method accessed by this method access. */