Unbox inline classes after safe calls if needed

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -423,6 +423,11 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
         return CodegenUtilKt.asmType(expression, typeMapper, bindingContext);
     }
 
+    @Nullable
+    public KotlinType kotlinType(@Nullable KtExpression expression) {
+        return CodegenUtilKt.kotlinType(expression, bindingContext);
+    }
+
     @Override
     public StackValue visitParenthesizedExpression(@NotNull KtParenthesizedExpression expression, StackValue receiver) {
         return genQualified(receiver, expression.getExpression());
@@ -2929,10 +2934,13 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
         KtExpression selector = expression.getSelectorExpression();
 
         Type receiverType = expressionType(receiver);
+        KotlinType receiverKotlinType = kotlinType(receiver);
         StackValue receiverValue = generateExpressionWithNullFallback(receiver, ifNull);
 
         //Do not optimize for primitives cause in case of safe call extension receiver should be generated before dispatch one
-        StackValue newReceiver = new StackValue.SafeCall(receiverType, receiverValue, isPrimitive(receiverType) ? null : ifNull);
+        StackValue newReceiver = new StackValue.SafeCall(
+                receiverType, receiverKotlinType, receiverValue, isPrimitive(receiverType) ? null : ifNull
+        );
         return genQualified(newReceiver, selector);
     }
 

compiler/backend/src/org/jetbrains/kotlin/codegen/StackValue.java

@@ -1925,8 +1925,8 @@ public abstract class StackValue {
         private final StackValue receiver;
         @Nullable private final Label ifNull;
 
-        public SafeCall(@NotNull Type type, @NotNull StackValue value, @Nullable Label ifNull) {
-            super(type);
+        public SafeCall(@NotNull Type type, @Nullable KotlinType kotlinType, @NotNull StackValue value, @Nullable Label ifNull) {
+            super(type, kotlinType);
             this.type = type;
             this.receiver = value;
             this.ifNull = ifNull;

compiler/testData/codegen/bytecodeText/inlineClasses/unboxInlineClassAfterSafeCall.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val x: Int) {
+    fun member() {}
+}
+
+fun Foo.extension() {}
+fun <T> T.genericExtension() {}
+
+fun test(f: Foo?) {
+    f?.member() // unbox
+    f?.extension() // unbox
+    f?.genericExtension()
+}
+
+// 0 INVOKESTATIC Foo\$Erased.box
+// 2 INVOKEVIRTUAL Foo.unbox
+
+// 0 valueOf
+// 0 intValue