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org.jetbrains.kotlin.backend.jvm.codegen.FunctionCodegen.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.backend.jvm.codegen
import org.jetbrains.kotlin.backend.common.lower.BOUND_RECEIVER_PARAMETER
import org.jetbrains.kotlin.backend.common.lower.BOUND_VALUE_PARAMETER
import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
import org.jetbrains.kotlin.backend.jvm.JvmLoweredDeclarationOrigin
import org.jetbrains.kotlin.backend.jvm.ir.*
import org.jetbrains.kotlin.backend.jvm.mapping.mapType
import org.jetbrains.kotlin.backend.jvm.mapping.mapTypeAsDeclaration
import org.jetbrains.kotlin.codegen.AsmUtil
import org.jetbrains.kotlin.codegen.inline.*
import org.jetbrains.kotlin.codegen.state.GenerationState
import org.jetbrains.kotlin.codegen.visitAnnotableParameterCount
import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
import org.jetbrains.kotlin.descriptors.Modality
import org.jetbrains.kotlin.ir.declarations.*
import org.jetbrains.kotlin.ir.descriptors.toIrBasedDescriptor
import org.jetbrains.kotlin.ir.expressions.*
import org.jetbrains.kotlin.ir.util.*
import org.jetbrains.kotlin.load.java.JavaDescriptorVisibilities
import org.jetbrains.kotlin.name.JvmNames.JVM_SYNTHETIC_ANNOTATION_FQ_NAME
import org.jetbrains.kotlin.name.JvmNames.STRICTFP_ANNOTATION_FQ_NAME
import org.jetbrains.kotlin.name.JvmNames.SYNCHRONIZED_ANNOTATION_FQ_NAME
import org.jetbrains.kotlin.resolve.annotations.JVM_THROWS_ANNOTATION_FQ_NAME
import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodParameterKind
import org.jetbrains.kotlin.resolve.jvm.jvmSignature.JvmMethodSignature
import org.jetbrains.kotlin.utils.addToStdlib.safeAs
import org.jetbrains.org.objectweb.asm.*
import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
import org.jetbrains.org.objectweb.asm.tree.MethodNode
class FunctionCodegen(private val irFunction: IrFunction, private val classCodegen: ClassCodegen) {
private val context = classCodegen.context
fun generate(
reifiedTypeParameters: ReifiedTypeParametersUsages = classCodegen.reifiedTypeParametersUsages
): SMAPAndMethodNode =
try {
doGenerate(reifiedTypeParameters)
} catch (e: Throwable) {
throw RuntimeException("Exception while generating code for:\n${irFunction.dump()}", e)
}
private fun doGenerate(reifiedTypeParameters: ReifiedTypeParametersUsages): SMAPAndMethodNode {
val signature = context.methodSignatureMapper.mapSignatureWithGeneric(irFunction)
val flags = irFunction.calculateMethodFlags()
val isSynthetic = flags.and(Opcodes.ACC_SYNTHETIC) != 0
val methodNode = MethodNode(
Opcodes.API_VERSION,
flags,
signature.asmMethod.name,
signature.asmMethod.descriptor,
signature.genericsSignature
.takeIf {
(irFunction.isInline && irFunction.origin != IrDeclarationOrigin.FUNCTION_FOR_DEFAULT_PARAMETER) ||
(!isSynthetic && irFunction.origin != IrDeclarationOrigin.LOCAL_FUNCTION_FOR_LAMBDA) ||
(irFunction.origin == JvmLoweredDeclarationOrigin.SUSPEND_IMPL_STATIC_FUNCTION)
},
getThrownExceptions(irFunction)?.toTypedArray()
)
val methodVisitor: MethodVisitor = wrapWithMaxLocalCalc(methodNode)
if (context.state.generateParametersMetadata && !isSynthetic) {
generateParameterNames(irFunction, methodVisitor, context.state)
}
if (irFunction.origin !in methodOriginsWithoutAnnotations) {
val skipNullabilityAnnotations = flags and Opcodes.ACC_PRIVATE != 0 || flags and Opcodes.ACC_SYNTHETIC != 0
object : AnnotationCodegen(classCodegen, context, skipNullabilityAnnotations) {
override fun visitAnnotation(descr: String, visible: Boolean): AnnotationVisitor {
return methodVisitor.visitAnnotation(descr, visible)
}
override fun visitTypeAnnotation(descr: String, path: TypePath?, visible: Boolean): AnnotationVisitor {
return methodVisitor.visitTypeAnnotation(
TypeReference.newTypeReference(TypeReference.METHOD_RETURN).value, path, descr, visible
)
}
}.genAnnotations(irFunction, signature.asmMethod.returnType, irFunction.returnType)
AnnotationCodegen.genAnnotationsOnTypeParametersAndBounds(
context,
irFunction,
classCodegen,
TypeReference.METHOD_TYPE_PARAMETER,
TypeReference.METHOD_TYPE_PARAMETER_BOUND
) { typeRef: Int, typePath: TypePath?, descriptor: String, visible: Boolean ->
methodVisitor.visitTypeAnnotation(typeRef, typePath, descriptor, visible)
}
if (shouldGenerateAnnotationsOnValueParameters()) {
generateParameterAnnotations(irFunction, methodVisitor, signature, classCodegen, context, skipNullabilityAnnotations)
}
}
// `$$forInline` versions of suspend functions have the same bodies as the originals, but with different
// name/flags/annotations and with no state machine.
val notForInline = irFunction.suspendForInlineToOriginal()
val smap = if (flags.and(Opcodes.ACC_ABSTRACT) != 0 || irFunction.isExternal) {
generateAnnotationDefaultValueIfNeeded(methodVisitor)
SMAP(listOf())
} else if (notForInline != null) {
val (originalNode, smap) = classCodegen.generateMethodNode(notForInline)
originalNode.accept(MethodBodyVisitor(methodVisitor))
smap
} else {
val sourceMapper = context.getSourceMapper(classCodegen.irClass)
val frameMap = irFunction.createFrameMapWithReceivers()
context.state.globalInlineContext.enterDeclaration(irFunction.suspendFunctionOriginal().toIrBasedDescriptor())
try {
val adapter = InstructionAdapter(methodVisitor)
ExpressionCodegen(irFunction, signature, frameMap, adapter, classCodegen, sourceMapper, reifiedTypeParameters).generate()
} finally {
context.state.globalInlineContext.exitDeclaration()
}
methodVisitor.visitMaxs(-1, -1)
SMAP(sourceMapper.resultMappings)
}
methodVisitor.visitEnd()
return SMAPAndMethodNode(methodNode, smap)
}
private fun shouldGenerateAnnotationsOnValueParameters(): Boolean =
when {
irFunction.origin == JvmLoweredDeclarationOrigin.SYNTHETIC_METHOD_FOR_PROPERTY_OR_TYPEALIAS_ANNOTATIONS ->
false
irFunction is IrConstructor && irFunction.parentAsClass.shouldNotGenerateConstructorParameterAnnotations() ->
false
else ->
true
}
// Since the only arguments to anonymous object constructors are captured variables and complex
// super constructor arguments, there shouldn't be any annotations on them other than @NonNull,
// and those are meaningless on synthetic parameters. (Also, the inliner cannot handle them and
// will throw an exception if we generate any.)
// The same applies for continuations.
private fun IrClass.shouldNotGenerateConstructorParameterAnnotations() =
isAnonymousObject || origin == JvmLoweredDeclarationOrigin.CONTINUATION_CLASS || origin == JvmLoweredDeclarationOrigin.SUSPEND_LAMBDA
private fun IrFunction.getVisibilityForDefaultArgumentStub(): Int =
when {
// TODO: maybe best to generate private default in interface as private
visibility == DescriptorVisibilities.PUBLIC || parentAsClass.isJvmInterface -> Opcodes.ACC_PUBLIC
visibility == JavaDescriptorVisibilities.PACKAGE_VISIBILITY -> AsmUtil.NO_FLAG_PACKAGE_PRIVATE
else -> throw IllegalStateException("Default argument stub should be either public or package private: ${ir2string(this)}")
}
private fun IrFunction.calculateMethodFlags(): Int {
if (origin == IrDeclarationOrigin.FUNCTION_FOR_DEFAULT_PARAMETER) {
return getVisibilityForDefaultArgumentStub() or Opcodes.ACC_SYNTHETIC or
(if (isDeprecatedFunction(context)) Opcodes.ACC_DEPRECATED else 0) or
(if (this is IrConstructor) 0 else Opcodes.ACC_STATIC)
}
val isVararg = valueParameters.lastOrNull()?.varargElementType != null && !isBridge()
val modalityFlag =
if (parentAsClass.isAnnotationClass) {
if (isStatic) 0 else Opcodes.ACC_ABSTRACT
} else {
when ((this as? IrSimpleFunction)?.modality) {
Modality.FINAL -> when {
origin == JvmLoweredDeclarationOrigin.CLASS_STATIC_INITIALIZER -> 0
origin == IrDeclarationOrigin.ENUM_CLASS_SPECIAL_MEMBER -> 0
parentAsClass.isInterface && body != null -> 0
else -> Opcodes.ACC_FINAL
}
Modality.ABSTRACT -> Opcodes.ACC_ABSTRACT
// TODO transform interface modality on lowering to DefaultImpls
else -> if (parentAsClass.isJvmInterface && body == null) Opcodes.ACC_ABSTRACT else 0
}
}
val isSynthetic = origin.isSynthetic ||
hasAnnotation(JVM_SYNTHETIC_ANNOTATION_FQ_NAME) ||
isReifiable() ||
isDeprecatedHidden()
val isStrict = hasAnnotation(STRICTFP_ANNOTATION_FQ_NAME) && origin != JvmLoweredDeclarationOrigin.JVM_OVERLOADS_WRAPPER
val isSynchronized = hasAnnotation(SYNCHRONIZED_ANNOTATION_FQ_NAME) && origin != JvmLoweredDeclarationOrigin.JVM_OVERLOADS_WRAPPER
return getVisibilityAccessFlag() or modalityFlag or
(if (isDeprecatedFunction(context)) Opcodes.ACC_DEPRECATED else 0) or
(if (isStatic) Opcodes.ACC_STATIC else 0) or
(if (isVararg) Opcodes.ACC_VARARGS else 0) or
(if (isExternal) Opcodes.ACC_NATIVE else 0) or
(if (isBridge()) Opcodes.ACC_BRIDGE else 0) or
(if (isSynthetic) Opcodes.ACC_SYNTHETIC else 0) or
(if (isStrict) Opcodes.ACC_STRICT else 0) or
(if (isSynchronized) Opcodes.ACC_SYNCHRONIZED else 0)
}
private fun IrFunction.isDeprecatedHidden(): Boolean {
val mightBeDeprecated = if (this is IrSimpleFunction) {
allOverridden(true).any {
it.isAnnotatedWithDeprecated || it.correspondingPropertySymbol?.owner?.isAnnotatedWithDeprecated == true
}
} else {
isAnnotatedWithDeprecated
}
return mightBeDeprecated && context.state.deprecationProvider.isDeprecatedHidden(toIrBasedDescriptor())
}
private fun getThrownExceptions(function: IrFunction): List? {
if (context.state.languageVersionSettings.supportsFeature(LanguageFeature.DoNotGenerateThrowsForDelegatedKotlinMembers) &&
function.origin == IrDeclarationOrigin.DELEGATED_MEMBER
) return null
// @Throws(vararg exceptionClasses: KClass)
val exceptionClasses = function.getAnnotation(JVM_THROWS_ANNOTATION_FQ_NAME)?.getValueArgument(0) ?: return null
return (exceptionClasses as IrVararg).elements.map { exceptionClass ->
context.typeMapper.mapType((exceptionClass as IrClassReference).classType).internalName
}
}
private fun generateAnnotationDefaultValueIfNeeded(methodVisitor: MethodVisitor) {
getAnnotationDefaultValueExpression()?.let { defaultValueExpression ->
val annotationCodegen = object : AnnotationCodegen(classCodegen, context) {
override fun visitAnnotation(descr: String, visible: Boolean): AnnotationVisitor {
return methodVisitor.visitAnnotationDefault()
}
}
annotationCodegen.generateAnnotationDefaultValue(defaultValueExpression)
}
}
private fun getAnnotationDefaultValueExpression(): IrExpression? {
if (!classCodegen.irClass.isAnnotationClass) return null
// TODO: any simpler way to get to the value expression?
// Are there other valid IR structures that represent the default value?
return irFunction.safeAs()
?.correspondingPropertySymbol?.owner
?.backingField
?.initializer.safeAs()
?.expression?.safeAs()
?.symbol?.owner?.safeAs()
?.defaultValue?.safeAs()
?.expression
}
private fun IrFunction.createFrameMapWithReceivers(): IrFrameMap {
val frameMap = IrFrameMap()
val receiver = if (this is IrConstructor) parentAsClass.thisReceiver else dispatchReceiverParameter
receiver?.let {
frameMap.enter(it, context.typeMapper.mapTypeAsDeclaration(it.type))
}
val contextReceivers = valueParameters.subList(0, contextReceiverParametersCount)
for (contextReceiver in contextReceivers) {
frameMap.enter(contextReceiver, context.typeMapper.mapType(contextReceiver.type))
}
extensionReceiverParameter?.let {
frameMap.enter(it, context.typeMapper.mapType(it))
}
val regularParameters = valueParameters.subList(contextReceiverParametersCount, valueParameters.size)
for (parameter in regularParameters) {
frameMap.enter(parameter, context.typeMapper.mapType(parameter.type))
}
return frameMap
}
// Borrowed from org.jetbrains.kotlin.codegen.FunctionCodegen.java
private fun generateParameterAnnotations(
irFunction: IrFunction,
mv: MethodVisitor,
jvmSignature: JvmMethodSignature,
innerClassConsumer: InnerClassConsumer,
context: JvmBackendContext,
skipNullabilityAnnotations: Boolean = false
) {
val iterator = irFunction.valueParameters.iterator()
val kotlinParameterTypes = jvmSignature.valueParameters
val syntheticParameterCount = kotlinParameterTypes.count { it.kind.isSkippedInGenericSignature }
visitAnnotableParameterCount(mv, kotlinParameterTypes.size - syntheticParameterCount)
kotlinParameterTypes.forEachIndexed { i, parameterSignature ->
val kind = parameterSignature.kind
val annotated = when (kind) {
JvmMethodParameterKind.RECEIVER -> irFunction.extensionReceiverParameter
else -> iterator.next()
}
if (annotated != null && !kind.isSkippedInGenericSignature && !annotated.isSyntheticMarkerParameter()) {
object : AnnotationCodegen(innerClassConsumer, context, skipNullabilityAnnotations) {
override fun visitAnnotation(descr: String, visible: Boolean): AnnotationVisitor {
return mv.visitParameterAnnotation(
i - syntheticParameterCount,
descr,
visible
)
}
override fun visitTypeAnnotation(descr: String, path: TypePath?, visible: Boolean): AnnotationVisitor {
return mv.visitTypeAnnotation(
TypeReference.newFormalParameterReference(i - syntheticParameterCount).value,
path, descr, visible
)
}
}.genAnnotations(annotated, parameterSignature.asmType, annotated.type)
}
}
}
companion object {
internal val methodOriginsWithoutAnnotations =
setOf(
// Not generating parameter annotations for default stubs fixes KT-7892, though
// this certainly looks like a workaround for a javac bug.
IrDeclarationOrigin.FUNCTION_FOR_DEFAULT_PARAMETER,
JvmLoweredDeclarationOrigin.SYNTHETIC_ACCESSOR,
IrDeclarationOrigin.ENUM_CLASS_SPECIAL_MEMBER,
IrDeclarationOrigin.GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER,
IrDeclarationOrigin.BRIDGE,
IrDeclarationOrigin.BRIDGE_SPECIAL,
JvmLoweredDeclarationOrigin.ABSTRACT_BRIDGE_STUB,
JvmLoweredDeclarationOrigin.TO_ARRAY,
IrDeclarationOrigin.IR_BUILTINS_STUB,
IrDeclarationOrigin.PROPERTY_DELEGATE,
)
}
}
private fun IrValueParameter.isSyntheticMarkerParameter(): Boolean =
origin == IrDeclarationOrigin.DEFAULT_CONSTRUCTOR_MARKER ||
origin == JvmLoweredDeclarationOrigin.SYNTHETIC_MARKER_PARAMETER
private fun generateParameterNames(irFunction: IrFunction, mv: MethodVisitor, state: GenerationState) {
irFunction.extensionReceiverParameter?.let {
mv.visitParameter(irFunction.extensionReceiverName(state), Opcodes.ACC_MANDATED)
}
for (irParameter in irFunction.valueParameters) {
// A construct emitted by a Java compiler must be marked as synthetic if it does not correspond to a construct declared
// explicitly or implicitly in source code, unless the emitted construct is a class initialization method (JVMS §2.9).
// A construct emitted by a Java compiler must be marked as mandated if it corresponds to a formal parameter
// declared implicitly in source code (§8.8.1, §8.8.9, §8.9.3, §15.9.5.1).
val access = when {
irParameter.origin == JvmLoweredDeclarationOrigin.FIELD_FOR_OUTER_THIS -> Opcodes.ACC_MANDATED
// TODO mark these backend-common origins as synthetic? (note: ExpressionCodegen is still expected
// to generate LVT entries for them)
irParameter.origin == IrDeclarationOrigin.MOVED_EXTENSION_RECEIVER -> Opcodes.ACC_MANDATED
irParameter.origin == IrDeclarationOrigin.MOVED_DISPATCH_RECEIVER -> Opcodes.ACC_SYNTHETIC
irParameter.origin == BOUND_VALUE_PARAMETER -> Opcodes.ACC_SYNTHETIC
irParameter.origin == BOUND_RECEIVER_PARAMETER -> Opcodes.ACC_SYNTHETIC
irParameter.origin.isSynthetic -> Opcodes.ACC_SYNTHETIC
else -> 0
}
mv.visitParameter(irParameter.name.asString(), access)
}
}
