From f2045b857b63ea1267ccd2467ea12d1ff08d2f57 Mon Sep 17 00:00:00 2001
From: Ivan Kylchik <ivan.kylchik@jetbrains.com>
Date: Thu, 11 Jun 2020 16:26:25 +0300
Subject: [PATCH] Add fix for interpretation const val

After FIR2IR processing getter doesn't has body, but has initializer.
On the other hand common IR has body for const val getter
---
 .../kotlin/backend/common/interpreter/IrInterpreter.kt   | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt
index ce401e2cc20..6a1b9bf038f 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt
@@ -307,7 +307,8 @@ class IrInterpreter(irModule: IrModuleFragment, private val bodyMap: Map<IdSigna
                 dispatchReceiver is Wrapper && !isInlineOnly -> dispatchReceiver.getMethod(irFunction).invokeMethod(irFunction)
                 irFunction.hasAnnotation(evaluateIntrinsicAnnotation) -> Wrapper.getStaticMethod(irFunction).invokeMethod(irFunction)
                 dispatchReceiver is Primitive<*> -> calculateBuiltIns(irFunction) // 'is Primitive' check for js char and js long
-                irFunction.body == null -> irFunction.trySubstituteFunctionBody() ?: calculateBuiltIns(irFunction)
+                irFunction.body == null ->
+                    irFunction.trySubstituteFunctionBody() ?: irFunction.tryCalculateLazyConst() ?: calculateBuiltIns(irFunction)
                 else -> irFunction.interpret()
             }
         }.check { return it }.implicitCastIfNeeded(expression.type, irFunction.returnType, stack)
@@ -327,6 +328,12 @@ class IrInterpreter(irModule: IrModuleFragment, private val bodyMap: Map<IdSigna
         }
     }
 
+    // TODO fix in FIR2IR; const val getter must have body with IrGetField node
+    private suspend fun IrFunction.tryCalculateLazyConst(): ExecutionResult? {
+        if (this !is IrSimpleFunction) return null
+        return this.correspondingPropertySymbol?.owner?.backingField?.initializer?.interpret()
+    }
+
     private suspend fun interpretInstanceInitializerCall(call: IrInstanceInitializerCall): ExecutionResult {
         val irClass = call.classSymbol.owner