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/*
* Copyright 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.compiler.plugins.kotlin.k2
import org.jetbrains.kotlin.KtSourceElement
import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
import org.jetbrains.kotlin.diagnostics.reportOn
import org.jetbrains.kotlin.fir.FirElement
import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
import org.jetbrains.kotlin.fir.analysis.checkers.expression.FirFunctionCallChecker
import org.jetbrains.kotlin.fir.analysis.checkers.expression.FirPropertyAccessExpressionChecker
import org.jetbrains.kotlin.fir.declarations.FirAnonymousFunction
import org.jetbrains.kotlin.fir.declarations.FirAnonymousInitializer
import org.jetbrains.kotlin.fir.declarations.FirAnonymousObject
import org.jetbrains.kotlin.fir.declarations.FirDeclaration
import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
import org.jetbrains.kotlin.fir.declarations.FirField
import org.jetbrains.kotlin.fir.declarations.FirFunction
import org.jetbrains.kotlin.fir.declarations.FirProperty
import org.jetbrains.kotlin.fir.declarations.FirPropertyAccessor
import org.jetbrains.kotlin.fir.declarations.FirValueParameter
import org.jetbrains.kotlin.fir.declarations.InlineStatus
import org.jetbrains.kotlin.fir.declarations.utils.isInline
import org.jetbrains.kotlin.fir.expressions.FirCatch
import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
import org.jetbrains.kotlin.fir.expressions.FirLambdaArgumentExpression
import org.jetbrains.kotlin.fir.expressions.FirPropertyAccessExpression
import org.jetbrains.kotlin.fir.expressions.FirQualifiedAccessExpression
import org.jetbrains.kotlin.fir.expressions.FirTryExpression
import org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList
import org.jetbrains.kotlin.fir.psi
import org.jetbrains.kotlin.fir.references.toResolvedCallableSymbol
import org.jetbrains.kotlin.fir.references.toResolvedValueParameterSymbol
import org.jetbrains.kotlin.fir.resolve.isInvoke
import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
import org.jetbrains.kotlin.fir.types.coneType
import org.jetbrains.kotlin.fir.types.functionTypeKind
import org.jetbrains.kotlin.psi.KtFunction
import org.jetbrains.kotlin.psi.KtFunctionLiteral
import org.jetbrains.kotlin.psi.KtLambdaExpression
object ComposablePropertyAccessExpressionChecker : FirPropertyAccessExpressionChecker() {
override fun check(
expression: FirPropertyAccessExpression,
context: CheckerContext,
reporter: DiagnosticReporter
) {
val calleeFunction = expression.calleeReference.toResolvedCallableSymbol()
?: return
if (calleeFunction.isComposable(context.session)) {
checkComposableCall(expression, calleeFunction, context, reporter)
}
}
}
object ComposableFunctionCallChecker : FirFunctionCallChecker() {
override fun check(
expression: FirFunctionCall,
context: CheckerContext,
reporter: DiagnosticReporter
) {
val calleeFunction = expression.calleeReference.toResolvedCallableSymbol()
?: return
// K2 propagates annotation from the fun interface method to the constructor.
// https://youtrack.jetbrains.com/issue/KT-47708.
if (calleeFunction.origin == FirDeclarationOrigin.SamConstructor) return
if (calleeFunction.isComposable(context.session)) {
checkComposableCall(expression, calleeFunction, context, reporter)
} else if (calleeFunction.callableId.isInvoke()) {
checkInvoke(expression, context, reporter)
}
}
}
/**
* Check if `expression` - a call to a composable function or access to a composable property -
* is allowed in the current context. It is allowed if:
*
* - It is executed as part of the body of a composable function.
* - It is not executed as part of the body of a lambda annotated with `@DisallowComposableCalls`.
* - It is not inside of a `try` block.
* - It is a call to a readonly composable function if it is executed in the body of a function
* that is annotated with `@ReadOnlyComposable`.
*
* A function is composable if:
* - It is annotated with `@Composable`.
* - It is a lambda whose type is inferred to be `ComposableFunction`.
* - It is an inline lambda whose enclosing function is composable.
*/
private fun checkComposableCall(
expression: FirQualifiedAccessExpression,
calleeFunction: FirCallableSymbol<*>,
context: CheckerContext,
reporter: DiagnosticReporter
) {
context.visitCurrentScope(
visitInlineLambdaParameter = { parameter ->
if (parameter.returnTypeRef.hasDisallowComposableCallsAnnotation(context.session)) {
reporter.reportOn(
expression.calleeReference.source,
ComposeErrors.CAPTURED_COMPOSABLE_INVOCATION,
parameter.symbol,
parameter.containingFunctionSymbol,
context
)
}
},
visitAnonymousFunction = { function ->
if (function.typeRef.coneType.functionTypeKind(context.session) === ComposableFunction)
return
val functionPsi = function.psi
if (functionPsi is KtFunctionLiteral || functionPsi is KtLambdaExpression ||
functionPsi !is KtFunction
) {
return@visitCurrentScope
}
val nonReadOnlyCalleeReference =
if (!calleeFunction.isReadOnlyComposable(context.session)) {
expression.calleeReference.source
} else {
null
}
if (checkComposableFunction(
function,
nonReadOnlyCalleeReference,
context,
reporter,
) == ComposableCheckForScopeStatus.STOP
) {
return
}
},
visitFunction = { function ->
val nonReadOnlyCalleeReference =
if (!calleeFunction.isReadOnlyComposable(context.session)) {
expression.calleeReference.source
} else {
null
}
if (checkComposableFunction(
function,
nonReadOnlyCalleeReference,
context,
reporter,
) == ComposableCheckForScopeStatus.STOP
) {
return
}
},
visitTryExpression = { tryExpression, container ->
// Only report an error if the composable call happens inside of the `try`
// block. Composable calls are allowed inside of `catch` and `finally` blocks.
if (container !is FirCatch && tryExpression.finallyBlock != container) {
reporter.reportOn(
tryExpression.source,
ComposeErrors.ILLEGAL_TRY_CATCH_AROUND_COMPOSABLE,
context
)
}
},
)
reporter.reportOn(
expression.calleeReference.source,
ComposeErrors.COMPOSABLE_INVOCATION,
context
)
}
private enum class ComposableCheckForScopeStatus {
STOP,
CONTINUE,
}
/**
* This function will be called by [visitCurrentScope], and this function determines
* whether it will continue the composable element check for the scope or not
* by returning [ComposableCheckForScopeStatus].
*/
private fun checkComposableFunction(
function: FirFunction,
nonReadOnlyCallInsideFunction: KtSourceElement?,
context: CheckerContext,
reporter: DiagnosticReporter,
): ComposableCheckForScopeStatus {
// [function] is a function with "read-only" composable annotation, but it has a call
// without "read-only" composable annotation.
// -> report NONREADONLY_CALL_IN_READONLY_COMPOSABLE.
if (function.hasComposableAnnotation(context.session)) {
if (
function.hasReadOnlyComposableAnnotation(context.session) &&
nonReadOnlyCallInsideFunction != null
) {
reporter.reportOn(
nonReadOnlyCallInsideFunction,
ComposeErrors.NONREADONLY_CALL_IN_READONLY_COMPOSABLE,
context
)
}
return ComposableCheckForScopeStatus.STOP
}
// We allow composable calls in local delegated properties.
// The only call this could be is a getValue/setValue in the synthesized getter/setter.
if (function is FirPropertyAccessor && function.propertySymbol.hasDelegate) {
if (function.propertySymbol.isVar) {
reporter.reportOn(
function.source,
ComposeErrors.COMPOSE_INVALID_DELEGATE,
context
)
}
// Only local variables can be implicitly composable, for top-level or class-level
// declarations we require an explicit annotation.
if (!function.propertySymbol.isLocal) {
reporter.reportOn(
function.propertySymbol.source,
ComposeErrors.COMPOSABLE_EXPECTED,
context
)
}
return ComposableCheckForScopeStatus.STOP
}
// We've found a non-composable function which contains a composable call.
val source = if (function is FirPropertyAccessor) {
function.propertySymbol.source
} else {
function.source
}
reporter.reportOn(source, ComposeErrors.COMPOSABLE_EXPECTED, context)
return ComposableCheckForScopeStatus.CONTINUE
}
/**
* Reports an error if we are invoking a lambda parameter of an inline function in a context
* where composable calls are not allowed, unless the lambda parameter is itself annotated
* with `@DisallowComposableCalls`.
*/
private fun checkInvoke(
expression: FirQualifiedAccessExpression,
context: CheckerContext,
reporter: DiagnosticReporter
) {
// Check that we're invoking a value parameter of an inline function
val param = (expression.dispatchReceiver as? FirPropertyAccessExpression)
?.calleeReference
?.toResolvedValueParameterSymbol()
?: return
if (param.resolvedReturnTypeRef.hasDisallowComposableCallsAnnotation(context.session) ||
!param.containingFunctionSymbol.isInline) {
return
}
context.visitCurrentScope(
visitInlineLambdaParameter = { parameter ->
if (parameter.returnTypeRef.hasDisallowComposableCallsAnnotation(context.session)) {
reporter.reportOn(
param.source,
ComposeErrors.MISSING_DISALLOW_COMPOSABLE_CALLS_ANNOTATION,
param,
parameter.symbol,
parameter.containingFunctionSymbol,
context
)
}
}
)
}
/**
* Visits all (Anonymous)Functions and `try` expressions in the current scope until it finds
* a declaration that introduces a new scope. Elements are visited from innermost to outermost.
*/
private inline fun CheckerContext.visitCurrentScope(
visitInlineLambdaParameter: (FirValueParameter) -> Unit,
visitAnonymousFunction: (FirAnonymousFunction) -> Unit = {},
visitFunction: (FirFunction) -> Unit = {},
visitTryExpression: (FirTryExpression, FirElement) -> Unit = { _, _ -> }
) {
for ((elementIndex, element) in containingElements.withIndex().reversed()) {
when (element) {
is FirAnonymousFunction -> {
if (element.inlineStatus == InlineStatus.Inline) {
findValueParameterForLambdaAtIndex(elementIndex)?.let { parameter ->
visitInlineLambdaParameter(parameter)
}
}
visitAnonymousFunction(element)
if (element.inlineStatus != InlineStatus.Inline) {
return
}
}
is FirFunction -> {
visitFunction(element)
return
}
is FirTryExpression -> {
val container = containingElements.getOrNull(elementIndex + 1)
?: continue
visitTryExpression(element, container)
}
is FirProperty -> {
// Coming from an initializer or delegate expression, otherwise we'd
// have hit a FirFunction and would already report an error.
}
is FirValueParameter -> {
// We're coming from a default value in a function declaration, we need to
// look at the enclosing function.
}
is FirAnonymousObject, is FirAnonymousInitializer -> {
// Anonymous objects don't change the current scope, continue.
}
is FirField -> {
if (element.origin == FirDeclarationOrigin.Synthetic.DelegateField) {
// Delegating in constructor creates a synthetic field in FIR.
// Continue through in this case in case it is an anonymous declaration.
} else {
// Other fields introduce new scope which cannot be composable.
return
}
}
// Every other declaration introduces a new scope which cannot be composable.
is FirDeclaration -> return
}
}
}
private fun CheckerContext.findValueParameterForLambdaAtIndex(
elementIndex: Int
): FirValueParameter? {
val argument = containingElements.getOrNull(elementIndex - 1) as? FirLambdaArgumentExpression
?: return null
val argumentList = containingElements.getOrNull(elementIndex - 2) as? FirResolvedArgumentList
?: return null
return argumentList.mapping[argument]
}
