Properly verify args in string concatenation expression for interpreter

If string concatenation contains object value, then this argument
will not have explicit toString call. We must find and check toString
method manually.

#KT-54615

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -20495,6 +20495,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                     runTest("compiler/testData/diagnostics/tests/modifiers/const/stdlibConstFun.kt");
                 }
 
+                @Test
+                @TestMetadata("stringConcatenationWithObject.kt")
+                public void testStringConcatenationWithObject() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.kt");
+                }
+
                 @Test
                 @TestMetadata("types.kt")
                 public void testTypes() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java

@@ -20495,6 +20495,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                     runTest("compiler/testData/diagnostics/tests/modifiers/const/stdlibConstFun.kt");
                 }
 
+                @Test
+                @TestMetadata("stringConcatenationWithObject.kt")
+                public void testStringConcatenationWithObject() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.kt");
+                }
+
                 @Test
                 @TestMetadata("types.kt")
                 public void testTypes() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java

@@ -20495,6 +20495,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                     runTest("compiler/testData/diagnostics/tests/modifiers/const/stdlibConstFun.kt");
                 }
 
+                @Test
+                @TestMetadata("stringConcatenationWithObject.kt")
+                public void testStringConcatenationWithObject() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.kt");
+                }
+
                 @Test
                 @TestMetadata("types.kt")
                 public void testTypes() throws Exception {

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/FirConstChecks.kt

@@ -66,8 +66,12 @@ internal fun checkConstantArguments(
             return checkConstantArguments(expression.compareToCall, session)
         }
         expression is FirStringConcatenationCall || expression is FirEqualityOperatorCall -> {
-            for (exp in (expression as FirCall).arguments)
+            for (exp in (expression as FirCall).arguments) {
+                if (exp is FirResolvedQualifier) {
+                    return ConstantArgumentKind.NOT_CONST
+                }
                 checkConstantArguments(exp, session).let { return it }
+            }
         }
         expression is FirGetClassCall -> {
             var coneType = (expression as? FirCall)?.argument?.typeRef?.coneType

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -17033,6 +17033,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/evaluate/simpleCallBinary.kt");
         }
 
+        @Test
+        @TestMetadata("stringConcatenationWithObject.kt")
+        public void testStringConcatenationWithObject() throws Exception {
+            runTest("compiler/testData/codegen/box/evaluate/stringConcatenationWithObject.kt");
+        }
+
         @Test
         @TestMetadata("thisPlusString.kt")
         public void testThisPlusString() throws Exception {

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/EvaluationMode.kt

@@ -103,7 +103,7 @@ enum class EvaluationMode(protected val mustCheckBody: Boolean) {
     abstract fun canEvaluateEnumValue(enumEntry: IrGetEnumValue, context: IrCall? = null): Boolean
     abstract fun canEvaluateReference(reference: IrCallableReference<*>, context: IrCall? = null): Boolean
 
-    fun canEvaluateBody(function: IrFunction): Boolean {
+    fun mustCheckBodyOf(function: IrFunction): Boolean {
         if (function is IrSimpleFunction && function.correspondingPropertySymbol != null) return true
         return (mustCheckBody || function.isLocal) && !function.isContract() && !function.isMarkedAsEvaluateIntrinsic()
     }

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrCompileTimeChecker.kt

@@ -54,11 +54,14 @@ class IrCompileTimeChecker(
     private fun visitConstructor(expression: IrFunctionAccessExpression): Boolean {
         return when {
             !visitValueParameters(expression, null) || !mode.canEvaluateFunction(expression.symbol.owner, contextExpression) -> false
-            mode.canEvaluateBody(expression.symbol.owner) -> expression.symbol.owner.body?.accept(this, null) != false
+            else -> expression.symbol.owner.visitBodyIfNeeded()
-            else -> true
         }
     }
 
+    private fun IrFunction.visitBodyIfNeeded(): Boolean {
+        return this.asVisited { !mode.mustCheckBodyOf(this) || (this.body?.accept(this@IrCompileTimeChecker, null) ?: true) }
+    }
+
     override fun visitCall(expression: IrCall, data: Nothing?): Boolean {
         val owner = expression.symbol.owner
         if (!mode.canEvaluateFunction(owner, expression)) return false
@@ -67,7 +70,7 @@ class IrCompileTimeChecker(
             val dispatchReceiverComputable = expression.dispatchReceiver?.accept(this, null) ?: true
             val extensionReceiverComputable = expression.extensionReceiver?.accept(this, null) ?: true
             if (!visitValueParameters(expression, null)) return@saveContext false
-            val bodyComputable = owner.asVisited { if (mode.canEvaluateBody(owner)) owner.body?.accept(this, null) ?: true else true }
+            val bodyComputable = owner.visitBodyIfNeeded()
             return@saveContext dispatchReceiverComputable && extensionReceiverComputable && bodyComputable
         }
     }
@@ -126,7 +129,19 @@ class IrCompileTimeChecker(
     }
 
     override fun visitStringConcatenation(expression: IrStringConcatenation, data: Nothing?): Boolean {
-        return expression.arguments.all { it.accept(this, data) }
+        return expression.arguments.all { arg ->
+            when (arg) {
+                is IrGetObjectValue -> {
+                    val toString = arg.symbol.owner.declarations
+                        .filterIsInstance<IrSimpleFunction>()
+                        .single { it.name.asString() == "toString" && it.valueParameters.isEmpty() }
+
+                    mode.canEvaluateFunction(toString, null) && toString.visitBodyIfNeeded()
+                }
+
+                else -> arg.accept(this, data)
+            }
+        }
     }
 
     override fun visitGetObjectValue(expression: IrGetObjectValue, data: Nothing?): Boolean {
@@ -218,7 +233,7 @@ class IrCompileTimeChecker(
 
         if (!mode.canEvaluateFunction(owner, contextExpression)) return false
 
-        val bodyComputable = owner.asVisited { if (mode.canEvaluateBody(owner)) owner.body?.accept(this, null) ?: true else true }
+        val bodyComputable = owner.visitBodyIfNeeded()
         return dispatchReceiverComputable && extensionReceiverComputable && bodyComputable
     }
 

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrConstTransformer.kt

@@ -55,8 +55,10 @@ class IrConstTransformer(
         val result = try {
             interpreter.interpret(this, irFile)
         } catch (e: Throwable) {
-            if (!suppressExceptions) throw AssertionError("Error occurred while optimizing an expression:\n${this.dump()}", e)
+            if (suppressExceptions) {
-            return IrErrorExpressionImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, this.type, e.message.toString()).warningIfError(this)
+                return this
+            }
+            throw AssertionError("Error occurred while optimizing an expression:\n${this.dump()}", e)
         }
 
         return if (failAsError) result.reportIfError(this) else result.warningIfError(this)

compiler/testData/codegen/box/evaluate/stringConcatenationWithObject.kt

@@ -0,0 +1,15 @@
+// TARGET_BACKEND: JVM_IR
+
+object K : Code("K")
+
+open class Code(val x: String) {
+    override fun toString() = "$x"
+}
+
+class O {
+    companion object: Code("O")
+}
+
+fun box(): String {
+    return "$O" + "$K" // must not be evaluated during compile time
+}

compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.kt

@@ -0,0 +1,18 @@
+// FIR_IDENTICAL
+
+object O : Code(0)
+
+open class Code(val x: Int) {
+    override fun toString() = "$x"
+}
+
+class A {
+    companion object: Code(0)
+}
+
+const val toString1 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>O.toString()<!>
+const val toString2 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>A.toString()<!>
+const val plusString1 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>"string" + O<!>
+const val plusString2 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>"string" + A<!>
+const val stringConcat1 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>"$O"<!>
+const val stringConcat2 = <!CONST_VAL_WITH_NON_CONST_INITIALIZER!>"$A"<!>

compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.txt

@@ -0,0 +1,40 @@
+package
+
+public const val plusString1: kotlin.String
+public const val plusString2: kotlin.String
+public const val stringConcat1: kotlin.String
+public const val stringConcat2: kotlin.String
+public const val toString1: kotlin.String
+public const val toString2: kotlin.String
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public companion object Companion : Code {
+        private constructor Companion()
+        public final override /*1*/ /*fake_override*/ val x: kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+public open class Code {
+    public constructor Code(/*0*/ x: kotlin.Int)
+    public final val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ fun toString(): kotlin.String
+}
+
+public object O : Code {
+    private constructor O()
+    public final override /*1*/ /*fake_override*/ val x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java

@@ -20501,6 +20501,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     runTest("compiler/testData/diagnostics/tests/modifiers/const/stdlibConstFun.kt");
                 }
 
+                @Test
+                @TestMetadata("stringConcatenationWithObject.kt")
+                public void testStringConcatenationWithObject() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/modifiers/const/stringConcatenationWithObject.kt");
+                }
+
                 @Test
                 @TestMetadata("types.kt")
                 public void testTypes() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -17033,6 +17033,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/evaluate/simpleCallBinary.kt");
         }
 
+        @Test
+        @TestMetadata("stringConcatenationWithObject.kt")
+        public void testStringConcatenationWithObject() throws Exception {
+            runTest("compiler/testData/codegen/box/evaluate/stringConcatenationWithObject.kt");
+        }
+
         @Test
         @TestMetadata("thisPlusString.kt")
         public void testThisPlusString() throws Exception {