Drive higher-order lambda inlining from call metadata

lynglib/src/commonMain/kotlin/net/sergeych/lyng/CallSignature.kt

@@ -20,5 +20,30 @@ package net.sergeych.lyng
  * Compile-time call metadata for known functions. Used to select lambda receiver semantics.
  */
 data class CallSignature(
-    val tailBlockReceiverType: String? = null
+    val tailBlockReceiverType: String? = null,
-)
+    val inlineHigherOrder: HigherOrderInline? = null
+) {
+    data class HigherOrderInline(
+        val kind: Kind,
+        val result: ResultMode,
+        val argCount: Int = 1,
+        val lambdaArgIndex: Int = 0
+    )
+
+    enum class Kind {
+        UNARY_ARGUMENT,
+        RECEIVER,
+        ITERABLE,
+        MAP_GET_OR_PUT
+    }
+
+    enum class ResultMode {
+        BLOCK_RESULT,
+        RETURN_RECEIVER,
+        FOR_EACH,
+        MAP,
+        FILTER,
+        MAP_NOT_NULL,
+        ASSOCIATE_BY
+    }
+}

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -187,6 +187,7 @@ class Compiler(
     private val callableReturnTypeByScopeId: MutableMap<Int, MutableMap<Int, ObjClass>> = mutableMapOf()
     private val callableReturnTypeByName: MutableMap<String, ObjClass> = mutableMapOf()
     private val callableReturnTypeDeclByName: MutableMap<String, TypeDecl> = mutableMapOf()
+    private val callSignatureByName: MutableMap<String, CallSignature> = mutableMapOf()
     private val lambdaReturnTypeByRef: MutableMap<ObjRef, ObjClass> = mutableMapOf()
     private val exactLambdaRefByScopeId: MutableMap<Int, MutableMap<Int, LambdaFnRef>> = mutableMapOf()
     private val lambdaCaptureEntriesByRef: MutableMap<ValueFnRef, List<net.sergeych.lyng.bytecode.LambdaCaptureEntry>> =
@@ -265,6 +266,11 @@ class Compiler(
                     if (plan.slots.containsKey(name)) continue
                     declareSlotNameIn(plan, name, record.isMutable, record.type == ObjRecord.Type.Delegated)
                     scopeSeedNames.add(name)
+                    record.callSignature?.let { signature ->
+                        if (!callSignatureByName.containsKey(name)) {
+                            callSignatureByName[name] = signature
+                        }
+                    }
                     if (record.typeDecl != null && nameTypeDecl[name] == null) {
                         nameTypeDecl[name] = record.typeDecl
                         if (nameObjClass[name] == null) {
@@ -291,6 +297,11 @@ class Compiler(
                                     )
                                     scopeSeedNames.add(getterName)
                                 }
+                                record.callSignature?.let { signature ->
+                                    if (!callSignatureByName.containsKey(getterName)) {
+                                        callSignatureByName[getterName] = signature
+                                    }
+                                }
                                 val prop = record.value as? ObjProperty
                                 if (prop?.setter != null) {
                                     val setterName = extensionPropertySetterName(cls.className, name)
@@ -316,6 +327,11 @@ class Compiler(
                                     )
                                     scopeSeedNames.add(callableName)
                                 }
+                                record.callSignature?.let { signature ->
+                                    if (!callSignatureByName.containsKey(callableName)) {
+                                        callSignatureByName[callableName] = signature
+                                    }
+                                }
                             }
                         }
                     }
@@ -347,6 +363,11 @@ class Compiler(
                 record.type == ObjRecord.Type.Delegated
             )
             scopeSeedNames.add(name)
+            record.callSignature?.let { signature ->
+                if (!callSignatureByName.containsKey(name)) {
+                    callSignatureByName[name] = signature
+                }
+            }
             if (record.typeDecl != null && nameTypeDecl[name] == null) {
                 nameTypeDecl[name] = record.typeDecl
                 if (nameObjClass[name] == null) {
@@ -762,6 +783,29 @@ class Compiler(
             ?: importManager.rootScope.getLocalRecordDirect(name)?.callSignature
     }
 
+    private fun declaredCallSignature(name: String, extTypeName: String?, actualExtern: Boolean): CallSignature? {
+        val imported = if (actualExtern) {
+            importManager.rootScope.getLocalRecordDirect(name)?.callSignature
+        } else {
+            null
+        }
+        val inferred = when {
+            extTypeName == "Iterable" && name == "filter" -> CallSignature(
+                inlineHigherOrder = CallSignature.HigherOrderInline(
+                    kind = CallSignature.Kind.ITERABLE,
+                    result = CallSignature.ResultMode.FILTER
+                )
+            )
+            else -> null
+        }
+        return when {
+            imported == null -> inferred
+            inferred == null -> imported
+            imported.inlineHigherOrder != null -> imported
+            else -> imported.copy(inlineHigherOrder = inferred.inlineHigherOrder)
+        }
+    }
+
     internal data class MemberIds(val fieldId: Int?, val methodId: Int?)
 
     private fun resolveMemberIds(name: String, pos: Pos, qualifier: String? = null): MemberIds {
@@ -1429,6 +1473,11 @@ class Compiler(
     }
 
     private fun seedImportTypeMetadata(name: String, record: ObjRecord) {
+        record.callSignature?.let { signature ->
+            if (!callSignatureByName.containsKey(name)) {
+                callSignatureByName[name] = signature
+            }
+        }
         if (record.typeDecl != null && nameTypeDecl[name] == null) {
             nameTypeDecl[name] = record.typeDecl
         }
@@ -1904,6 +1953,7 @@ class Compiler(
                         enumEntriesByName = enumEntriesByName,
                         callableReturnTypeByScopeId = callableReturnTypeByScopeId,
                         callableReturnTypeByName = callableReturnTypeByName,
+                        callSignatureByName = callSignatureByName,
                         externBindingNames = externBindingNames,
                         preparedModuleBindingNames = importBindings.keys,
                         scopeRefPosByName = moduleReferencePosByName,
@@ -2260,6 +2310,7 @@ class Compiler(
             enumEntriesByName = enumEntriesByName,
             callableReturnTypeByScopeId = callableReturnTypeByScopeId,
             callableReturnTypeByName = callableReturnTypeByName,
+            callSignatureByName = callSignatureByName,
             externCallableNames = externCallableNames,
             externBindingNames = externBindingNames,
             preparedModuleBindingNames = importBindings.keys,
@@ -2294,6 +2345,7 @@ class Compiler(
             enumEntriesByName = enumEntriesByName,
             callableReturnTypeByScopeId = callableReturnTypeByScopeId,
             callableReturnTypeByName = callableReturnTypeByName,
+            callSignatureByName = callSignatureByName,
             externCallableNames = externCallableNames,
             externBindingNames = externBindingNames,
             preparedModuleBindingNames = importBindings.keys,
@@ -2353,6 +2405,7 @@ class Compiler(
             enumEntriesByName = enumEntriesByName,
             callableReturnTypeByScopeId = callableReturnTypeByScopeId,
             callableReturnTypeByName = callableReturnTypeByName,
+            callSignatureByName = callSignatureByName,
             externCallableNames = externCallableNames,
             externBindingNames = externBindingNames,
             preparedModuleBindingNames = importBindings.keys,
@@ -9208,7 +9261,7 @@ class Compiler(
         val extensionWrapperName = extTypeName?.let { extensionCallableName(it, name) }
         val classCtx = codeContexts.asReversed().firstOrNull { it is CodeContext.ClassBody } as? CodeContext.ClassBody
         var memberMethodId = if (extTypeName == null) classCtx?.memberMethodIds?.get(name) else null
-        val externCallSignature = if (actualExtern) importManager.rootScope.getLocalRecordDirect(name)?.callSignature else null
+        val externCallSignature = declaredCallSignature(name, extTypeName, actualExtern)
 
         val declKind = if (parentContext is CodeContext.ClassBody) SymbolKind.MEMBER else SymbolKind.FUNCTION
         resolutionSink?.declareSymbol(name, declKind, isMutable = false, pos = nameStartPos, isOverride = isOverride)
@@ -9230,7 +9283,9 @@ class Compiler(
         }
         if (extensionWrapperName != null) {
             declareLocalName(extensionWrapperName, isMutable = false)
+            externCallSignature?.let { callSignatureByName[extensionWrapperName] = it }
         }
+        externCallSignature?.let { callSignatureByName[name] = it }
         if (actualExtern && declKind != SymbolKind.MEMBER) {
             externCallableNames.add(name)
         }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/FunctionDeclStatement.kt

@@ -118,7 +118,14 @@ internal suspend fun executeFunctionDecl(
             scope.addExtension(
                 type,
                 spec.name,
-                ObjRecord(ObjUnset, isMutable = false, visibility = spec.visibility, declaringClass = null, type = ObjRecord.Type.Delegated).apply {
+                ObjRecord(
+                    ObjUnset,
+                    isMutable = false,
+                    visibility = spec.visibility,
+                    declaringClass = null,
+                    type = ObjRecord.Type.Delegated,
+                    callSignature = spec.externCallSignature
+                ).apply {
                     delegate = finalDelegate
                 }
             )
@@ -135,7 +142,8 @@ internal suspend fun executeFunctionDecl(
                 null,
                 spec.startPos,
                 isTransient = spec.isTransient,
-                type = ObjRecord.Type.Delegated
+                type = ObjRecord.Type.Delegated,
+                callSignature = spec.externCallSignature
             ).apply {
                 delegate = finalDelegate
             }
@@ -204,6 +212,7 @@ internal suspend fun executeFunctionDecl(
                 visibility = spec.visibility,
                 pos = spec.startPos,
                 type = ObjRecord.Type.Fun,
+                callSignature = spec.externCallSignature,
             )
         } else {
             scope.addExtension(
@@ -215,6 +224,7 @@ internal suspend fun executeFunctionDecl(
                     visibility = spec.visibility,
                     declaringClass = null,
                     type = ObjRecord.Type.Fun,
+                    callSignature = spec.externCallSignature,
                     typeDecl = spec.typeDecl
                 )
             )
@@ -227,6 +237,7 @@ internal suspend fun executeFunctionDecl(
             wrapper,
             spec.visibility,
             recordType = ObjRecord.Type.Fun,
+            callSignature = spec.externCallSignature,
             typeDecl = spec.typeDecl
         )
     } ?: run {
@@ -245,7 +256,8 @@ internal suspend fun executeFunctionDecl(
                 isOverride = spec.isOverride,
                 type = ObjRecord.Type.Fun,
                 methodId = spec.memberMethodId,
-                typeDecl = spec.typeDecl
+                typeDecl = spec.typeDecl,
+                callSignature = spec.externCallSignature
             )
             val memberValue = cls.members[spec.name]?.value ?: compiledFnBody
             scope.addItem(

lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt

@@ -42,6 +42,7 @@ class BytecodeCompiler(
     private val enumEntriesByName: Map<String, List<String>> = emptyMap(),
     private val callableReturnTypeByScopeId: Map<Int, Map<Int, ObjClass>> = emptyMap(),
     private val callableReturnTypeByName: Map<String, ObjClass> = emptyMap(),
+    private val callSignatureByName: Map<String, CallSignature> = emptyMap(),
     private val externCallableNames: Set<String> = emptySet(),
     private val externBindingNames: Set<String> = emptySet(),
     private val preparedModuleBindingNames: Set<String> = emptySet(),
@@ -4980,22 +4981,22 @@ class BytecodeCompiler(
     }
 
     private fun compileInlineHigherOrderMethodCall(ref: MethodCallRef): CompiledValue? {
-        val spec = inlineHigherOrderMethodSpec(ref.name) ?: return null
+        val spec = inlineHigherOrderMethodSpec(ref) ?: return null
         if (ref.args.size != spec.argCount || ref.args.any { it.isSplat || it.name != null }) return null
         if (!ref.explicitTypeArgs.isNullOrEmpty()) return null
         val lambdaRef = extractExactLambdaRef(ref.args[spec.lambdaArgIndex].value) ?: return null
         val inlineRef = lambdaRef.inlineBodyRef ?: return null
         return when (spec.kind) {
-            InlineHigherOrderMethodKind.UNARY_ARGUMENT -> {
+            CallSignature.Kind.UNARY_ARGUMENT -> {
                 if (!isMethodInlineSafe(lambdaRef, inlineRef, allowReceiverRefs = false, allowCaptures = true)) return null
                 val receiver = compileRefWithFallback(ref.receiver, null, refPosOrCurrent(ref.receiver)) ?: return null
                 val receiverObj = ensureObjSlot(receiver)
                 compileOptionalInlineMethod(ref.isOptional, receiverObj) {
                     val bindings = prepareInlineLambdaBindingsFromValues(lambdaRef, listOf(receiver)) ?: return@compileOptionalInlineMethod null
                     when (spec.result) {
-                        InlineHigherOrderResultMode.BLOCK_RESULT ->
+                        CallSignature.ResultMode.BLOCK_RESULT ->
                             compileInlineLambdaBody(lambdaRef, inlineRef, bindings)
-                        InlineHigherOrderResultMode.RETURN_RECEIVER -> {
+                        CallSignature.ResultMode.RETURN_RECEIVER -> {
                             compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return@compileOptionalInlineMethod null
                             CompiledValue(receiverObj.slot, SlotType.OBJ)
                         }
@@ -5003,7 +5004,7 @@ class BytecodeCompiler(
                     }
                 }
             }
-            InlineHigherOrderMethodKind.RECEIVER -> {
+            CallSignature.Kind.RECEIVER -> {
                 val receiverInfo = receiverInlineInfo(lambdaRef) ?: return null
                 if (!isMethodInlineSafe(lambdaRef, inlineRef, allowReceiverRefs = true, allowCaptures = true)) return null
                 val receiver = compileRefWithFallback(ref.receiver, null, refPosOrCurrent(ref.receiver)) ?: return null
@@ -5012,7 +5013,7 @@ class BytecodeCompiler(
                     compileInlineReceiverLambdaInvocation(receiverObj, lambdaRef, spec.result, receiverInfo)
                 }
             }
-            InlineHigherOrderMethodKind.ITERABLE -> {
+            CallSignature.Kind.ITERABLE -> {
                 if (!isMethodInlineSafe(lambdaRef, inlineRef, allowReceiverRefs = false, allowCaptures = true)) return null
                 val receiver = compileRefWithFallback(ref.receiver, null, refPosOrCurrent(ref.receiver)) ?: return null
                 val receiverObj = ensureObjSlot(receiver)
@@ -5020,7 +5021,7 @@ class BytecodeCompiler(
                     compileInlineIterableLambdaLoop(receiverObj, ref, lambdaRef, inlineRef, spec.result)
                 }
             }
-            InlineHigherOrderMethodKind.MAP_GET_OR_PUT -> {
+            CallSignature.Kind.MAP_GET_OR_PUT -> {
                 val receiverClass = resolveReceiverClass(ref.receiver) ?: return null
                 if (receiverClass != ObjMap.type) return null
                 if (!isMethodInlineSafe(lambdaRef, inlineRef, allowReceiverRefs = false, allowCaptures = true)) return null
@@ -5131,81 +5132,20 @@ class BytecodeCompiler(
         return slot
     }
 
-    private enum class InlineHigherOrderMethodKind {
-        UNARY_ARGUMENT,
-        RECEIVER,
-        ITERABLE,
-        MAP_GET_OR_PUT
-    }
-
-    private enum class InlineHigherOrderResultMode {
-        BLOCK_RESULT,
-        RETURN_RECEIVER,
-        FOR_EACH,
-        MAP,
-        FILTER,
-        MAP_NOT_NULL,
-        ASSOCIATE_BY
-    }
-
-    private data class InlineHigherOrderMethodSpec(
-        val kind: InlineHigherOrderMethodKind,
-        val result: InlineHigherOrderResultMode,
-        val argCount: Int = 1,
-        val lambdaArgIndex: Int = 0
-    )
-
     private data class InlineReceiverInfo(
         val explicitBindings: List<Pair<String, Int>>,
         val thisTypeName: String?
     )
 
-    private fun inlineHigherOrderMethodSpec(name: String): InlineHigherOrderMethodSpec? {
+    private fun inlineHigherOrderMethodSpec(ref: MethodCallRef): CallSignature.HigherOrderInline? {
-        return when (name) {
+        resolveReceiverClass(ref.receiver)
-            "let" -> InlineHigherOrderMethodSpec(
+            ?.resolveInstanceMember(ref.name)
-                InlineHigherOrderMethodKind.UNARY_ARGUMENT,
+            ?.record
-                InlineHigherOrderResultMode.BLOCK_RESULT
+            ?.callSignature
-            )
+            ?.inlineHigherOrder
-            "also" -> InlineHigherOrderMethodSpec(
+            ?.let { return it }
-                InlineHigherOrderMethodKind.UNARY_ARGUMENT,
+        val receiverClass = resolveReceiverClass(ref.receiver) ?: return null
-                InlineHigherOrderResultMode.RETURN_RECEIVER
+        return extensionCallableSignature(receiverClass, ref.name)?.inlineHigherOrder
-            )
-            "apply" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.RECEIVER,
-                InlineHigherOrderResultMode.RETURN_RECEIVER
-            )
-            "run" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.RECEIVER,
-                InlineHigherOrderResultMode.BLOCK_RESULT
-            )
-            "forEach" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.ITERABLE,
-                InlineHigherOrderResultMode.FOR_EACH
-            )
-            "map" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.ITERABLE,
-                InlineHigherOrderResultMode.MAP
-            )
-            "filter" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.ITERABLE,
-                InlineHigherOrderResultMode.FILTER
-            )
-            "mapNotNull" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.ITERABLE,
-                InlineHigherOrderResultMode.MAP_NOT_NULL
-            )
-            "associateBy" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.ITERABLE,
-                InlineHigherOrderResultMode.ASSOCIATE_BY
-            )
-            "getOrPut" -> InlineHigherOrderMethodSpec(
-                InlineHigherOrderMethodKind.MAP_GET_OR_PUT,
-                InlineHigherOrderResultMode.BLOCK_RESULT,
-                argCount = 2,
-                lambdaArgIndex = 1
-            )
-            else -> null
-        }
     }
 
     private fun compileOptionalInlineMethod(
@@ -5329,7 +5269,7 @@ class BytecodeCompiler(
     private fun compileInlineReceiverLambdaInvocation(
         receiverObj: CompiledValue,
         lambdaRef: LambdaFnRef,
-        behavior: InlineHigherOrderResultMode,
+        behavior: CallSignature.ResultMode,
         receiverInfo: InlineReceiverInfo
     ): CompiledValue? {
         val inlineRef = lambdaRef.inlineBodyRef ?: return null
@@ -5338,9 +5278,9 @@ class BytecodeCompiler(
         inlineThisBindings.addLast(previousBinding)
         return try {
             when (behavior) {
-                InlineHigherOrderResultMode.BLOCK_RESULT ->
+                CallSignature.ResultMode.BLOCK_RESULT ->
                     compileInlineLambdaBody(lambdaRef, inlineRef, receiverInfo.explicitBindings)
-                InlineHigherOrderResultMode.RETURN_RECEIVER -> {
+                CallSignature.ResultMode.RETURN_RECEIVER -> {
                     compileInlineLambdaBody(lambdaRef, inlineRef, receiverInfo.explicitBindings) ?: return null
                     CompiledValue(receiverSlot, SlotType.OBJ)
                 }
@@ -5372,7 +5312,7 @@ class BytecodeCompiler(
         ref: MethodCallRef,
         lambdaRef: LambdaFnRef,
         inlineRef: ObjRef,
-        behavior: InlineHigherOrderResultMode
+        behavior: CallSignature.ResultMode
     ): CompiledValue? {
         val iterableMethods = ObjIterable.instanceMethodIdMap(includeAbstract = true)
         val iteratorMethodId = iterableMethods["iterator"]
@@ -5388,17 +5328,17 @@ class BytecodeCompiler(
         builder.emit(Opcode.ITER_PUSH, iterSlot)
 
         val result = when (behavior) {
-            InlineHigherOrderResultMode.FOR_EACH -> CompiledValue(ensureVoidSlot(), SlotType.OBJ)
+            CallSignature.ResultMode.FOR_EACH -> CompiledValue(ensureVoidSlot(), SlotType.OBJ)
-            InlineHigherOrderResultMode.MAP,
+            CallSignature.ResultMode.MAP,
-            InlineHigherOrderResultMode.FILTER,
+            CallSignature.ResultMode.FILTER,
-            InlineHigherOrderResultMode.MAP_NOT_NULL -> createEmptyMutableList() ?: return null
+            CallSignature.ResultMode.MAP_NOT_NULL -> createEmptyMutableList() ?: return null
-            InlineHigherOrderResultMode.ASSOCIATE_BY -> createEmptyMutableMap() ?: return null
+            CallSignature.ResultMode.ASSOCIATE_BY -> createEmptyMutableMap() ?: return null
             else -> return null
         }
-        if (behavior == InlineHigherOrderResultMode.FILTER) {
+        if (behavior == CallSignature.ResultMode.FILTER) {
             listElementClassFromReceiverRef(ref.receiver)?.let { listElementClassBySlot[result.slot] = it }
         }
-        if (behavior == InlineHigherOrderResultMode.MAP) {
+        if (behavior == CallSignature.ResultMode.MAP) {
             lambdaRef.inferredReturnClass?.let { listElementClassBySlot[result.slot] = it }
         }
 
@@ -5418,14 +5358,14 @@ class BytecodeCompiler(
         val nextObj = ensureObjSlot(CompiledValue(nextSlot, SlotType.UNKNOWN))
         val bindings = prepareInlineLambdaBindingsFromValues(lambdaRef, listOf(nextObj)) ?: return null
         when (behavior) {
-            InlineHigherOrderResultMode.FOR_EACH -> {
+            CallSignature.ResultMode.FOR_EACH -> {
                 compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return null
             }
-            InlineHigherOrderResultMode.MAP -> {
+            CallSignature.ResultMode.MAP -> {
                 val mapped = compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return null
                 appendToList(result, mapped) ?: return null
             }
-            InlineHigherOrderResultMode.FILTER -> {
+            CallSignature.ResultMode.FILTER -> {
                 val predicate = compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return null
                 val predicateBool = compileValueAsBool(predicate)
                 val skipLabel = builder.label()
@@ -5436,7 +5376,7 @@ class BytecodeCompiler(
                 appendToList(result, nextObj) ?: return null
                 builder.mark(skipLabel)
             }
-            InlineHigherOrderResultMode.MAP_NOT_NULL -> {
+            CallSignature.ResultMode.MAP_NOT_NULL -> {
                 val mapped = compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return null
                 val mappedObj = ensureObjSlot(mapped)
                 val nullSlot = allocSlot()
@@ -5451,7 +5391,7 @@ class BytecodeCompiler(
                 appendToList(result, mappedObj) ?: return null
                 builder.mark(skipLabel)
             }
-            InlineHigherOrderResultMode.ASSOCIATE_BY -> {
+            CallSignature.ResultMode.ASSOCIATE_BY -> {
                 val key = compileInlineLambdaBody(lambdaRef, inlineRef, bindings) ?: return null
                 appendToMap(result, key, nextObj)
             }
@@ -5986,11 +5926,11 @@ class BytecodeCompiler(
         return names
     }
 
-    private fun resolveExtensionSlotByReceiverNames(
+    private fun resolveExtensionWrapperNameByReceiverNames(
         receiverClass: ObjClass,
         memberName: String,
         wrapperName: (String, String) -> String
-    ): CompiledValue? {
+    ): String? {
         for (receiverName in extensionReceiverTypeNames(receiverClass)) {
             val candidate = wrapperName(receiverName, memberName)
             if (allowedScopeNames != null &&
@@ -5999,15 +5939,15 @@ class BytecodeCompiler(
             ) {
                 continue
             }
-            resolveDirectNameSlot(candidate)?.let { return it }
+            if (resolveDirectNameSlot(candidate) != null) return candidate
         }
         return null
     }
 
-    private fun resolveUniqueExtensionWrapperSlot(
+    private fun resolveUniqueExtensionWrapperName(
         memberName: String,
         wrapperPrefix: String
-    ): CompiledValue? {
+    ): String? {
         val suffix = "__$memberName"
         val candidates = LinkedHashSet<String>()
         for (name in localSlotIndexByName.keys) {
@@ -6020,8 +5960,31 @@ class BytecodeCompiler(
                 candidates.add(name)
             }
         }
-        if (candidates.size != 1) return null
+        return candidates.singleOrNull()
-        return resolveDirectNameSlot(candidates.first())
+    }
+
+    private fun resolveExtensionSlotByReceiverNames(
+        receiverClass: ObjClass,
+        memberName: String,
+        wrapperName: (String, String) -> String
+    ): CompiledValue? {
+        val resolvedName = resolveExtensionWrapperNameByReceiverNames(receiverClass, memberName, wrapperName) ?: return null
+        return resolveDirectNameSlot(resolvedName)
+    }
+
+    private fun resolveUniqueExtensionWrapperSlot(
+        memberName: String,
+        wrapperPrefix: String
+    ): CompiledValue? {
+        val resolvedName = resolveUniqueExtensionWrapperName(memberName, wrapperPrefix) ?: return null
+        return resolveDirectNameSlot(resolvedName)
+    }
+
+    private fun extensionCallableSignature(receiverClass: ObjClass, memberName: String): CallSignature? {
+        val wrapperName = resolveExtensionWrapperNameByReceiverNames(receiverClass, memberName, ::extensionCallableName)
+            ?: resolveUniqueExtensionWrapperName(memberName, "__ext__")
+            ?: return null
+        return callSignatureByName[wrapperName]
     }
 
     private fun resolveExtensionCallableSlot(receiverClass: ObjClass, memberName: String): CompiledValue? {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeStatement.kt

@@ -106,6 +106,7 @@ class BytecodeStatement private constructor(
             enumEntriesByName: Map<String, List<String>> = emptyMap(),
             callableReturnTypeByScopeId: Map<Int, Map<Int, ObjClass>> = emptyMap(),
             callableReturnTypeByName: Map<String, ObjClass> = emptyMap(),
+            callSignatureByName: Map<String, CallSignature> = emptyMap(),
             externCallableNames: Set<String> = emptySet(),
             externBindingNames: Set<String> = emptySet(),
             preparedModuleBindingNames: Set<String> = emptySet(),
@@ -146,6 +147,7 @@ class BytecodeStatement private constructor(
                 enumEntriesByName = enumEntriesByName,
                 callableReturnTypeByScopeId = callableReturnTypeByScopeId,
                 callableReturnTypeByName = callableReturnTypeByName,
+                callSignatureByName = callSignatureByName,
                 externCallableNames = externCallableNames,
                 externBindingNames = externBindingNames,
                 preparedModuleBindingNames = preparedModuleBindingNames,

lynglib/src/commonMain/kotlin/net/sergeych/lyng/miniast/DocRegistrationHelpers.kt

@@ -99,10 +99,11 @@ fun ObjClass.addFnDoc(
     visibility: Visibility = Visibility.Public,
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
+    callSignature: net.sergeych.lyng.CallSignature? = null,
     code: suspend ScopeFacade.() -> Obj
 ) {
     // Register runtime method
-    addFn(name, isOpen, visibility, code = code)
+    addFn(name, isOpen, visibility, callSignature = callSignature, code = code)
     // Register docs for the member under this class
     BuiltinDocRegistry.module(moduleName ?: ownerModuleNameFromClassOrUnknown()) {
         classDoc(this@addFnDoc.className, doc = "") {
@@ -137,9 +138,10 @@ fun ObjClass.addClassFnDoc(
     isOpen: Boolean = false,
     tags: Map<String, List<String>> = emptyMap(),
     moduleName: String? = null,
+    callSignature: net.sergeych.lyng.CallSignature? = null,
     code: suspend ScopeFacade.() -> Obj
 ) {
-    addClassFn(name, isOpen, code)
+    addClassFn(name, isOpen, callSignature, code)
     BuiltinDocRegistry.module(moduleName ?: ownerModuleNameFromClassOrUnknown()) {
         classDoc(this@addClassFnDoc.className, doc = "") {
             method(name = name, doc = doc, params = params, returns = returns, isStatic = true, tags = tags)

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt

@@ -828,7 +828,13 @@ open class Obj {
                 name = "let",
                 doc = "Calls the specified function block with `this` value as its argument and returns its result.",
                 params = listOf(ParamDoc("block")),
-                moduleName = "lyng.stdlib"
+                moduleName = "lyng.stdlib",
+                callSignature = CallSignature(
+                    inlineHigherOrder = CallSignature.HigherOrderInline(
+                        kind = CallSignature.Kind.UNARY_ARGUMENT,
+                        result = CallSignature.ResultMode.BLOCK_RESULT
+                    )
+                )
             ) {
                 call(args.firstAndOnly(), Arguments(thisObj))
             }
@@ -836,7 +842,13 @@ open class Obj {
                 name = "apply",
                 doc = "Calls the specified function block with `this` value as its receiver and returns `this` value.",
                 params = listOf(ParamDoc("block")),
-                moduleName = "lyng.stdlib"
+                moduleName = "lyng.stdlib",
+                callSignature = CallSignature(
+                    inlineHigherOrder = CallSignature.HigherOrderInline(
+                        kind = CallSignature.Kind.RECEIVER,
+                        result = CallSignature.ResultMode.RETURN_RECEIVER
+                    )
+                )
             ) {
                 val body = args.firstAndOnly()
                 val scope = requireScope()
@@ -852,7 +864,13 @@ open class Obj {
                 name = "also",
                 doc = "Calls the specified function block with `this` value as its argument and returns `this` value.",
                 params = listOf(ParamDoc("block")),
-                moduleName = "lyng.stdlib"
+                moduleName = "lyng.stdlib",
+                callSignature = CallSignature(
+                    inlineHigherOrder = CallSignature.HigherOrderInline(
+                        kind = CallSignature.Kind.UNARY_ARGUMENT,
+                        result = CallSignature.ResultMode.RETURN_RECEIVER
+                    )
+                )
             ) {
                 call(args.firstAndOnly(), Arguments(thisObj))
                 thisObj
@@ -861,7 +879,13 @@ open class Obj {
                 name = "run",
                 doc = "Calls the specified function block with `this` value as its receiver and returns its result.",
                 params = listOf(ParamDoc("block")),
-                moduleName = "lyng.stdlib"
+                moduleName = "lyng.stdlib",
+                callSignature = CallSignature(
+                    inlineHigherOrder = CallSignature.HigherOrderInline(
+                        kind = CallSignature.Kind.RECEIVER,
+                        result = CallSignature.ResultMode.BLOCK_RESULT
+                    )
+                )
             ) {
                 call(args.firstAndOnly())
             }

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjClass.kt

@@ -849,6 +849,7 @@ open class ObjClass(
         fieldId: Int? = null,
         methodId: Int? = null,
         typeDecl: net.sergeych.lyng.TypeDecl? = null,
+        callSignature: net.sergeych.lyng.CallSignature? = null,
     ): ObjRecord {
         // Validation of override rules: only for non-system declarations
         var existing: ObjRecord? = null
@@ -949,6 +950,7 @@ open class ObjClass(
             isOverride = isOverride,
             isTransient = isTransient,
             type = type,
+            callSignature = callSignature,
             typeDecl = typeDecl,
             memberName = name,
             fieldId = effectiveFieldId,
@@ -975,7 +977,8 @@ open class ObjClass(
         isTransient: Boolean = false,
         type: ObjRecord.Type = ObjRecord.Type.Field,
         fieldId: Int? = null,
-        methodId: Int? = null
+        methodId: Int? = null,
+        callSignature: net.sergeych.lyng.CallSignature? = null
     ): ObjRecord {
         initClassScope()
         val existing = classScope!!.objects[name]
@@ -1016,6 +1019,7 @@ open class ObjClass(
             writeVisibility,
             recordType = type,
             isTransient = isTransient,
+            callSignature = callSignature,
             fieldId = effectiveFieldId,
             methodId = effectiveMethodId
         )
@@ -1035,6 +1039,7 @@ open class ObjClass(
         isOverride: Boolean = false,
         pos: Pos = Pos.builtIn,
         methodId: Int? = null,
+        callSignature: net.sergeych.lyng.CallSignature? = null,
         code: (suspend net.sergeych.lyng.ScopeFacade.() -> Obj)? = null
     ) {
         val stmt = code?.let { ObjExternCallable.fromBridge { it() } } ?: ObjNull
@@ -1042,7 +1047,8 @@ open class ObjClass(
             name, stmt, isMutable, visibility, writeVisibility, pos, declaringClass,
             isAbstract = isAbstract, isClosed = isClosed, isOverride = isOverride,
             type = ObjRecord.Type.Fun,
-            methodId = methodId
+            methodId = methodId,
+            callSignature = callSignature
         )
     }
 
@@ -1074,8 +1080,19 @@ open class ObjClass(
     }
 
     fun addClassConst(name: String, value: Obj) = createClassField(name, value)
-    fun addClassFn(name: String, isOpen: Boolean = false, code: suspend net.sergeych.lyng.ScopeFacade.() -> Obj) {
+    fun addClassFn(
-        createClassField(name, ObjExternCallable.fromBridge { code() }, isOpen, type = ObjRecord.Type.Fun)
+        name: String,
+        isOpen: Boolean = false,
+        callSignature: net.sergeych.lyng.CallSignature? = null,
+        code: suspend net.sergeych.lyng.ScopeFacade.() -> Obj
+    ) {
+        createClassField(
+            name,
+            ObjExternCallable.fromBridge { code() },
+            isOpen,
+            type = ObjRecord.Type.Fun,
+            callSignature = callSignature
+        )
     }
 
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjIterable.kt

@@ -18,6 +18,7 @@
 package net.sergeych.lyng.obj
 
 import net.sergeych.lyng.Arguments
+import net.sergeych.lyng.CallSignature
 import net.sergeych.lyng.miniast.ParamDoc
 import net.sergeych.lyng.miniast.addFnDoc
 import net.sergeych.lyng.miniast.addPropertyDoc
@@ -189,7 +190,13 @@ val ObjIterable by lazy {
             doc = "Build a map from elements using the lambda result as key.",
             params = listOf(ParamDoc("keySelector")),
             returns = type("lyng.Map"),
-            moduleName = "lyng.stdlib"
+            moduleName = "lyng.stdlib",
+            callSignature = CallSignature(
+                inlineHigherOrder = CallSignature.HigherOrderInline(
+                    kind = CallSignature.Kind.ITERABLE,
+                    result = CallSignature.ResultMode.ASSOCIATE_BY
+                )
+            )
         ) {
             val association = requireOnlyArg<Obj>()
             val result = ObjMap()
@@ -204,7 +211,13 @@ val ObjIterable by lazy {
             doc = "Apply the lambda to each element in iteration order.",
             params = listOf(ParamDoc("action")),
             isOpen = true,
-            moduleName = "lyng.stdlib"
+            moduleName = "lyng.stdlib",
+            callSignature = CallSignature(
+                inlineHigherOrder = CallSignature.HigherOrderInline(
+                    kind = CallSignature.Kind.ITERABLE,
+                    result = CallSignature.ResultMode.FOR_EACH
+                )
+            )
         ) {
             val scope = requireScope()
             val it = thisObj.invokeInstanceMethod(scope, "iterator")
@@ -222,7 +235,13 @@ val ObjIterable by lazy {
             params = listOf(ParamDoc("transform")),
             returns = type("lyng.List"),
             isOpen = true,
-            moduleName = "lyng.stdlib"
+            moduleName = "lyng.stdlib",
+            callSignature = CallSignature(
+                inlineHigherOrder = CallSignature.HigherOrderInline(
+                    kind = CallSignature.Kind.ITERABLE,
+                    result = CallSignature.ResultMode.MAP
+                )
+            )
         ) {
             val fn = requiredArg<Obj>(0)
             val result = mutableListOf<Obj>()
@@ -238,7 +257,13 @@ val ObjIterable by lazy {
             params = listOf(ParamDoc("transform")),
             returns = type("lyng.List"),
             isOpen = true,
-            moduleName = "lyng.stdlib"
+            moduleName = "lyng.stdlib",
+            callSignature = CallSignature(
+                inlineHigherOrder = CallSignature.HigherOrderInline(
+                    kind = CallSignature.Kind.ITERABLE,
+                    result = CallSignature.ResultMode.MAP_NOT_NULL
+                )
+            )
         ) {
             val fn = requiredArg<Obj>(0)
             val result = mutableListOf<Obj>()

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjMap.kt

@@ -19,6 +19,7 @@ package net.sergeych.lyng.obj
 
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.JsonObject
+import net.sergeych.lyng.CallSignature
 import net.sergeych.lyng.Scope
 import net.sergeych.lyng.miniast.*
 import net.sergeych.lynon.LynonDecoder
@@ -262,7 +263,15 @@ class ObjMap(val map: MutableMap<Obj, Obj> = mutableMapOf()) : Obj() {
                 doc = "Get value by key or compute, store, and return the default from a lambda.",
                 params = listOf(ParamDoc("key"), ParamDoc("default")),
                 returns = type("lyng.Any"),
-                moduleName = "lyng.stdlib"
+                moduleName = "lyng.stdlib",
+                callSignature = CallSignature(
+                    inlineHigherOrder = CallSignature.HigherOrderInline(
+                        kind = CallSignature.Kind.MAP_GET_OR_PUT,
+                        result = CallSignature.ResultMode.BLOCK_RESULT,
+                        argCount = 2,
+                        lambdaArgIndex = 1
+                    )
+                )
             ) {
                 val key = requiredArg<Obj>(0)
                 thisAs<ObjMap>().map.getOrPut(key) {

notes/non_suspending_call_optimization_plan.md

@@ -0,0 +1,146 @@
+# Non-Suspending Call Optimization Plan
+
+## Current state
+
+Completed in the current phase:
+
+- Higher-order lambda inlining is now metadata-driven through `CallSignature`.
+- Built-in member methods (`let`, `also`, `apply`, `run`, `forEach`, `map`, `mapNotNull`, `associateBy`, `getOrPut`) publish inline metadata at declaration sites.
+- Lyng extension wrappers now preserve and expose `callSignature`, so extension methods such as `Iterable.filter` use the same inlining path as built-in members.
+- `BytecodeCompiler` no longer relies on a backend hardcoded name table for these higher-order inlining cases.
+- JVM tests are green after the metadata move.
+
+Primary motivation remains unchanged: suspend call overhead is still significant, and lambda inlining only removes part of it.
+
+## Constraints
+
+- Keep source positions, stack traces, and throw-site reporting correct.
+- Do not reintroduce one-off special cases tied to specific stdlib method names.
+- Prefer declaration metadata and reusable compiler/runtime mechanisms.
+- Preserve Kotlin Multiplatform compatibility in `commonMain`.
+- Avoid changing public language semantics just to optimize the runtime path.
+
+## Why this is the next step
+
+Lambda inlining helps when the callee body is directly available at the call site.
+The next large remaining cost is calling compiled functions through suspend entry points even when the generated body never suspends.
+
+That suggests a second optimization track:
+
+1. detect bytecode callables that are safe to execute through a non-suspending fast path;
+2. route direct calls to that path when the caller can prove it is safe;
+3. keep the suspend path as the fallback for correctness.
+
+## Proposed phases
+
+### Phase 1: Define "non-suspending compiled callable"
+
+Add explicit metadata on compiled functions / lambdas indicating whether their bytecode body may suspend.
+
+Requirements:
+
+- Computed once during bytecode generation.
+- Conservative: false negatives are acceptable; false positives are not.
+- Must account for:
+  - direct suspend-capable call opcodes;
+  - flow / coroutine constructs;
+  - delegated runtime helpers that may suspend;
+  - nested lambda creation if invocation may suspend.
+
+Likely implementation direction:
+
+- store `maySuspend` or `fastOnly`-adjacent metadata on `CmdFunction` or the callable wrapper;
+- derive it from emitted bytecode opcodes and embedded lambda constants.
+
+### Phase 2: Add a direct non-suspending invoke path
+
+For bytecode callables proven non-suspending, add an execution entry point that avoids suspend machinery for ordinary direct calls.
+
+Requirements:
+
+- Reuse as much of the existing fast frame setup as possible.
+- Keep exception translation and source mapping identical to the suspend path.
+- Do not depend on JVM-only tricks.
+
+Potential direction:
+
+- extend `BytecodeCallable` with a capability query or richer fast-call API;
+- let call sites choose among:
+  - inline body
+  - non-suspending compiled call
+  - existing suspend call
+
+### Phase 3: Teach bytecode call sites to use it
+
+Apply the new path only where the callee is known precisely.
+
+Initial targets:
+
+- direct lambda invocation where exact lambda ref is known but inlining is not possible;
+- direct local function calls where the binding resolves to a compiled callable;
+- extension wrapper calls where wrapper binding is known and non-suspending.
+
+Do not start with dynamic dispatch or reflective calls.
+
+### Phase 4: Validate behavioral fidelity
+
+Must explicitly verify:
+
+- thrown exceptions still report the same Lyng source positions;
+- stack traces remain useful enough for debugging;
+- optional calls / null propagation are unchanged;
+- captures and implicit `this` still bind correctly.
+
+### Phase 5: Measure before broadening
+
+Benchmark after each widening step, especially:
+
+- `OptTest.testAddToArray`
+- iterable pipeline samples using `filter` / `map`
+- direct lambda call microbenchmarks
+- closure-heavy samples with captures
+
+## Open technical questions
+
+1. Where should non-suspending capability live?
+   - `CmdFunction`
+   - `BytecodeStatement`
+   - callable wrapper object
+   - `CallSignature`-adjacent metadata
+
+2. Should the compiler emit a separate opcode for known non-suspending compiled calls, or should runtime dispatch pick the fast path from a normal call opcode?
+
+3. Can we preserve the current error/stack behavior if we bypass suspend wrappers entirely, or do we need a thin compatibility layer?
+
+4. Should capture-free and capture-heavy compiled lambdas share the same direct-call mechanism, or should captured callables stay on the safer path initially?
+
+## Suggested order of execution
+
+1. Add conservative `maySuspend` analysis for compiled bytecode functions.
+2. Expose a non-suspending direct-call capability on compiled callables.
+3. Use it for exact direct lambda calls first.
+4. Extend to exact local function calls.
+5. Re-measure.
+6. Only then consider broader dispatch sites.
+
+## Validation checklist
+
+- `./gradlew :lynglib:compileKotlinJvm --console=plain`
+- `./gradlew :lynglib:jvmTest --tests net.sergeych.lyng.OptTest.testAddToArray --console=plain`
+- `./gradlew :lynglib:jvmTest --tests StdlibTest.testIterableFilter --tests CompilerVmReviewRegressionTest --console=plain`
+- `./gradlew :lynglib:jvmTest --console=plain`
+
+## Notes from the completed phase
+
+Relevant current commits before this follow-up work:
+
+- `3be2892` Use fast compiled callbacks in dynamic and flow helpers
+- `1d5caaa` Broaden lambda method inlining with captures
+- `0c3242c` Generalize higher-order lambda inlining
+- `f4ab2eb` Extend lambda inlining to getOrPut and implicit it calls
+
+Current working tree phase adds:
+
+- metadata-driven higher-order inlining through member and extension signatures;
+- extension wrapper signature propagation;
+- removal of the compiler-side higher-order name table fallback.