Add variables support in interpreter

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/IrInterpreter.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.declarations.IrConstructor
+import org.jetbrains.kotlin.ir.declarations.IrVariable
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.util.isFakeOverride
 import org.jetbrains.kotlin.ir.util.statements
@@ -22,12 +23,12 @@ class IrInterpreter : IrElementVisitor<State, Frame> {
     private val any = Complex(builtIns.any, mutableListOf())
 
     fun interpret(expression: IrExpression): IrExpression {
-        return visitExpression(expression, InterpreterFrame()).toIrExpression()
+        return visitExpression(expression, InterpreterFrame()).convertToIrExpression(expression)
     }
 
-    private fun State.toIrExpression(): IrExpression {
+    private fun State.convertToIrExpression(expression: IrExpression): IrExpression {
         return when (this) {
-            is Primitive<*> -> this.getIrConst()
+            is Primitive<*> -> this.getIrConst().value.toIrConst(expression) // it is necessary to replace ir offsets
             else -> TODO("not supported")
         }
     }
@@ -129,4 +130,21 @@ class IrInterpreter : IrElementVisitor<State, Frame> {
     override fun visitGetValue(expression: IrGetValue, data: Frame): State {
         return data.getVar(expression.symbol.descriptor).copy()
     }
+
+    override fun visitVariable(declaration: IrVariable, data: Frame): State {
+        val variable = declaration.initializer?.accept(this, data)?.setDescriptor(declaration.descriptor)
+        variable?.let { data.addVar(it) }
+        return unit
+    }
+
+    override fun visitSetVariable(expression: IrSetVariable, data: Frame): State {
+        if (data.contains(expression.symbol.descriptor)) {
+            val variable = data.getVar(expression.symbol.descriptor)
+            variable.setState(expression.value.accept(this, data))
+        } else {
+            val variable = expression.value.accept(this, data).setDescriptor(expression.symbol.descriptor)
+            data.addVar(variable)
+        }
+        return unit
+    }
 }

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/Utils.kt

@@ -76,21 +76,27 @@ fun IrFunctionAccessExpression.getBody(): IrBody? {
     return this.symbol.owner.body
 }
 
-fun Any.toIrConst(expression: IrExpression): IrConst<*> {
+fun Any?.toIrConst(expression: IrExpression): IrConst<*> {
     return when (this) {
-        is Boolean -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Boolean, this)
-        is Char -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Char, this)
-        is Byte -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Byte, this)
-        is Short -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Short, this)
-        is Int -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Int, this)
-        is Long -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Long, this)
-        is String -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.String, this)
-        is Float -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Float, this)
-        is Double -> IrConstImpl(expression.startOffset, expression.endOffset, expression.type, IrConstKind.Double, this)
+        is Boolean -> expression.copyParametersTo(IrConstKind.Boolean, this)
+        is Char -> expression.copyParametersTo(IrConstKind.Char, this)
+        is Byte -> expression.copyParametersTo(IrConstKind.Byte, this)
+        is Short -> expression.copyParametersTo(IrConstKind.Short, this)
+        is Int -> expression.copyParametersTo(IrConstKind.Int, this)
+        is Long -> expression.copyParametersTo(IrConstKind.Long, this)
+        is String -> expression.copyParametersTo(IrConstKind.String, this)
+        is Float -> expression.copyParametersTo(IrConstKind.Float, this)
+        is Double -> expression.copyParametersTo(IrConstKind.Double, this)
+        null -> expression.copyParametersTo(IrConstKind.Null, this)
         else -> throw UnsupportedOperationException("Unsupported const element type $this")
     }
 }
 
+@Suppress("UNCHECKED_CAST")
+private fun <T> IrExpression.copyParametersTo(kind: IrConstKind<T>, value: Any?): IrConst<T> {
+    return IrConstImpl(startOffset, endOffset, type, kind, value as T)
+}
+
 fun <T> IrConst<T>.toPrimitive(): Primitive<T> {
     return Primitive(this)
 }

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/interpreter/stack/Frame.kt

@@ -12,6 +12,7 @@ interface Frame {
     fun addVar(state: State)
     fun getVar(descriptor: DeclarationDescriptor): State
     fun getAll(): List<State>
+    fun contains(descriptor: DeclarationDescriptor): Boolean
 }
 
 class InterpreterFrame(val pool: MutableList<State> = mutableListOf()) : Frame {
@@ -27,4 +28,8 @@ class InterpreterFrame(val pool: MutableList<State> = mutableListOf()) : Frame {
     override fun getAll(): List<State> {
         return pool
     }
+
+    override fun contains(descriptor: DeclarationDescriptor): Boolean {
+        return pool.any { it.isTypeOf(descriptor) }
+    }
 }