JVM_IR. Support compile time constants

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/ConstAndJvmFieldPropertiesLowering.kt

@@ -13,7 +13,9 @@ import org.jetbrains.kotlin.descriptors.PropertyGetterDescriptor
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrProperty
+import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.expressions.IrCall
+import org.jetbrains.kotlin.ir.expressions.IrConst
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.impl.IrGetFieldImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrSetFieldImpl
@@ -22,6 +24,7 @@ import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.synthetic.SyntheticJavaPropertyDescriptor
 
 class ConstAndJvmFieldPropertiesLowering(val context: JvmBackendContext) : IrElementTransformerVoid(), FileLoweringPass {
+
     override fun lower(irFile: IrFile) {
         irFile.transformChildrenVoid(this)
     }
@@ -36,6 +39,12 @@ class ConstAndJvmFieldPropertiesLowering(val context: JvmBackendContext) : IrEle
     }
 
     override fun visitCall(expression: IrCall): IrExpression {
+        val irProperty = (expression.symbol.owner as? IrSimpleFunction)?.correspondingProperty ?: return super.visitCall(expression)
+
+        if (irProperty.isConst) {
+            (irProperty.backingField?.initializer?.expression as? IrConst<*>)?.let { return it }
+        }
+
         val descriptor = expression.descriptor as? PropertyAccessorDescriptor ?: return super.visitCall(expression)
 
         val property = descriptor.correspondingProperty
@@ -65,7 +74,7 @@ class ConstAndJvmFieldPropertiesLowering(val context: JvmBackendContext) : IrEle
         )
     }
 
-    private fun substituteGetter(descriptor: PropertyGetterDescriptor, expression: IrCall): IrGetFieldImpl {
+    private fun substituteGetter(descriptor: PropertyGetterDescriptor, expression: IrCall): IrExpression {
         return IrGetFieldImpl(
             expression.startOffset,
             expression.endOffset,

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -79,14 +79,21 @@ class DeclarationStubGenerator(
                 throw AssertionError("Unexpected member descriptor: $descriptor")
         }
 
-    internal fun generatePropertyStub(descriptor: PropertyDescriptor, bindingContext: BindingContext? = null): IrProperty =
+    internal fun generatePropertyStub(
+        descriptor: PropertyDescriptor,
+        bindingContext: BindingContext? = null
+    ): IrProperty =
         IrPropertyImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, origin, descriptor).also { irProperty ->
             if (descriptor.hasBackingField(bindingContext)) {
                 irProperty.backingField = generateFieldStub(descriptor)
             }
 
-            irProperty.getter = descriptor.getter?.let { generateFunctionStub(it) }
-            irProperty.setter = descriptor.setter?.let { generateFunctionStub(it) }
+            irProperty.getter = descriptor.getter?.let { generateFunctionStub(it, createPropertyIfNeeded = false) }?.apply {
+                correspondingProperty = irProperty
+            }
+            irProperty.setter = descriptor.setter?.let { generateFunctionStub(it, createPropertyIfNeeded = false) }?.apply {
+                correspondingProperty = irProperty
+            }
         }
 
     private fun generateFieldStub(descriptor: PropertyDescriptor): IrField {
@@ -117,12 +124,19 @@ class DeclarationStubGenerator(
         }
     }
 
-    fun generateFunctionStub(descriptor: FunctionDescriptor): IrSimpleFunction {
+    fun generateFunctionStub(descriptor: FunctionDescriptor, createPropertyIfNeeded: Boolean = true): IrSimpleFunction {
         val referenced = symbolTable.referenceSimpleFunction(descriptor)
         if (referenced.isBound) {
             return referenced.owner
         }
 
+        if (createPropertyIfNeeded && descriptor is PropertyGetterDescriptor) {
+            return generatePropertyStub(descriptor.correspondingProperty).getter!!
+        }
+        if (createPropertyIfNeeded && descriptor is PropertySetterDescriptor) {
+            return generatePropertyStub(descriptor.correspondingProperty).setter!!
+        }
+
         val origin =
             if (descriptor.kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE)
                 IrDeclarationOrigin.FAKE_OVERRIDE