Revert "Add a key to enable spilling of all variables in a suspending context"

This reverts commit 38d97d0621.

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineTransformerMethodVisitor.kt

@@ -61,8 +61,7 @@ class CoroutineTransformerMethodVisitor(
     // JVM_IR backend generates $completion, while old backend does not
     private val putContinuationParameterToLvt: Boolean = true,
     // Parameters of suspend lambda are put to the same fields as spilled variables
-    private val initialVarsCountByType: Map<Type, Int> = emptyMap(),
-    private val shouldOptimiseUnusedVariables: Boolean = true
+    private val initialVarsCountByType: Map<Type, Int> = emptyMap()
 ) : TransformationMethodVisitor(delegate, access, name, desc, signature, exceptions) {
 
     private val classBuilderForCoroutineState: ClassBuilder by lazy(obtainClassBuilderForCoroutineState)
@@ -207,9 +206,7 @@ class CoroutineTransformerMethodVisitor(
         dropUnboxInlineClassMarkers(methodNode, suspensionPoints)
         methodNode.removeEmptyCatchBlocks()
 
-        if (shouldOptimiseUnusedVariables) {
-            updateLvtAccordingToLiveness(methodNode, isForNamedFunction, stateLabels)
-        }
+        updateLvtAccordingToLiveness(methodNode, isForNamedFunction, stateLabels)
 
         writeDebugMetadata(methodNode, suspensionPointLineNumbers, spilledToVariableMapping)
     }
@@ -670,7 +667,7 @@ class CoroutineTransformerMethodVisitor(
             for (slot in 0 until localsCount) {
                 if (slot == continuationIndex || slot == dataIndex) continue
                 val value = frame.getLocal(slot)
-                if (value.type == null || (shouldOptimiseUnusedVariables && !livenessFrame.isAlive(slot))) continue
+                if (value.type == null || !livenessFrame.isAlive(slot)) continue
 
                 if (value == StrictBasicValue.NULL_VALUE) {
                     referencesToSpill += slot to null
@@ -878,16 +875,12 @@ class CoroutineTransformerMethodVisitor(
             for ((slot, referenceToSpill) in referencesToSpillBySuspensionPointIndex[suspensionPointIndex]) {
                 generateSpillAndUnspill(suspension, slot, referenceToSpill)
             }
-
-            if (shouldOptimiseUnusedVariables) {
-                val (currentSpilledCount, predSpilledCount) = referencesToCleanBySuspensionPointIndex[suspensionPointIndex]
-                if (predSpilledCount > currentSpilledCount) {
-                    for (fieldIndex in currentSpilledCount until predSpilledCount) {
-                        cleanUpField(suspension, fieldIndex)
-                    }
+            val (currentSpilledCount, predSpilledCount) = referencesToCleanBySuspensionPointIndex[suspensionPointIndex]
+            if (predSpilledCount > currentSpilledCount) {
+                for (fieldIndex in currentSpilledCount until predSpilledCount) {
+                    cleanUpField(suspension, fieldIndex)
                 }
             }
-
             for ((slot, primitiveToSpill) in primitivesToSpillBySuspensionPointIndex[suspensionPointIndex]) {
                 generateSpillAndUnspill(suspension, slot, primitiveToSpill)
             }

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -511,13 +511,6 @@ Also sets `-jvm-target` value equal to the selected JDK version"""
     )
     var linkViaSignatures: Boolean by FreezableVar(false)
 
-    @Argument(
-        value = "-Xdebug",
-        description = "Enable debug mode for compilation.\n" +
-                "Currently this includes spilling all variables in a suspending context regardless their liveness."
-    )
-    var enableDebugMode: Boolean by FreezableVar(false)
-
     override fun configureAnalysisFlags(collector: MessageCollector, languageVersion: LanguageVersion): MutableMap<AnalysisFlag<*>, Any> {
         val result = super.configureAnalysisFlags(collector, languageVersion)
         result[JvmAnalysisFlags.strictMetadataVersionSemantics] = strictMetadataVersionSemantics

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/jvmArguments.kt

@@ -310,8 +310,6 @@ fun CompilerConfiguration.configureAdvancedJvmOptions(arguments: K2JVMCompilerAr
 
     put(JVMConfigurationKeys.LINK_VIA_SIGNATURES, arguments.linkViaSignatures)
 
-    put(JVMConfigurationKeys.ENABLE_DEBUG_MODE, arguments.enableDebugMode)
-
     val assertionsMode =
         JVMAssertionsMode.fromStringOrNull(arguments.assertionsMode)
     if (assertionsMode == null) {

compiler/config.jvm/src/org/jetbrains/kotlin/config/JVMConfigurationKeys.java

@@ -156,7 +156,4 @@ public class JVMConfigurationKeys {
 
     public static final CompilerConfigurationKey<Boolean> LINK_VIA_SIGNATURES =
             CompilerConfigurationKey.create("Link JVM IR symbols via signatures, instead of by descriptors");
-
-    public static final CompilerConfigurationKey<Boolean> ENABLE_DEBUG_MODE =
-            CompilerConfigurationKey.create("Enable debug mode");
 }

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/CoroutineCodegen.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.backend.jvm.unboxInlineClass
 import org.jetbrains.kotlin.codegen.ClassBuilder
 import org.jetbrains.kotlin.codegen.coroutines.CoroutineTransformerMethodVisitor
 import org.jetbrains.kotlin.codegen.coroutines.reportSuspensionPointInsideMonitor
-import org.jetbrains.kotlin.config.JVMConfigurationKeys
 import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.expressions.IrBlockBody
@@ -37,14 +36,13 @@ internal fun MethodNode.acceptWithStateMachine(
     varsCountByType: Map<Type, Int>,
     obtainContinuationClassBuilder: () -> ClassBuilder,
 ) {
-    val context = classCodegen.context
-    val state = context.state
+    val state = classCodegen.context.state
     val languageVersionSettings = state.languageVersionSettings
     assert(languageVersionSettings.supportsFeature(LanguageFeature.ReleaseCoroutines)) { "Experimental coroutines are unsupported in JVM_IR backend" }
     val element = if (irFunction.isSuspend)
         irFunction.psiElement ?: classCodegen.irClass.psiElement
     else
-        context.suspendLambdaToOriginalFunctionMap[classCodegen.irClass.attributeOwnerId]!!.psiElement
+        classCodegen.context.suspendLambdaToOriginalFunctionMap[classCodegen.irClass.attributeOwnerId]!!.psiElement
 
     val lineNumber = if (irFunction.isSuspend) {
         val irFile = irFunction.file
@@ -76,7 +74,6 @@ internal fun MethodNode.acceptWithStateMachine(
         internalNameForDispatchReceiver = classCodegen.type.internalName,
         putContinuationParameterToLvt = false,
         initialVarsCountByType = varsCountByType,
-        shouldOptimiseUnusedVariables = !context.configuration.getBoolean(JVMConfigurationKeys.ENABLE_DEBUG_MODE)
     )
     accept(visitor)
 }