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//===--- ActorIsolation.cpp -----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ActorIsolation.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ConformanceLookup.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Expr.h"
using namespace swift;
ActorIsolation ActorIsolation::forMainActor(ASTContext &ctx) {
return ActorIsolation::forGlobalActor(
ctx.getMainActorType()->mapTypeOutOfContext());
}
ActorIsolation::ActorIsolation(Kind kind, NominalTypeDecl *actor,
unsigned parameterIndex)
: actorInstance(actor), kind(kind), isolatedByPreconcurrency(false),
silParsed(false), parameterIndex(parameterIndex) {}
ActorIsolation::ActorIsolation(Kind kind, VarDecl *actor,
unsigned parameterIndex)
: actorInstance(actor), kind(kind), isolatedByPreconcurrency(false),
silParsed(false), parameterIndex(parameterIndex) {}
ActorIsolation::ActorIsolation(Kind kind, Expr *actor, unsigned parameterIndex)
: actorInstance(actor), kind(kind), isolatedByPreconcurrency(false),
silParsed(false), parameterIndex(parameterIndex) {}
ActorIsolation::ActorIsolation(Kind kind, Type globalActor)
: globalActor(globalActor), kind(kind), isolatedByPreconcurrency(false),
silParsed(false), parameterIndex(0) {}
ActorIsolation
ActorIsolation::forActorInstanceParameter(Expr *actor,
unsigned parameterIndex) {
auto &ctx = actor->getType()->getASTContext();
// An isolated value of `nil` is statically nonisolated.
// FIXME: Also allow 'Optional.none'
if (isa<NilLiteralExpr>(actor))
return ActorIsolation::forNonisolated(/*unsafe*/ false);
// An isolated value of `<global actor type>.shared` is statically
// global actor isolated.
if (auto *memberRef = dyn_cast<MemberRefExpr>(actor)) {
// Check that the member declaration witnesses the `shared`
// requirement of the `GlobalActor` protocol.
auto declRef = memberRef->getDecl();
auto baseType = memberRef->getBase()->getType()->getMetatypeInstanceType();
if (auto globalActor = ctx.getProtocol(KnownProtocolKind::GlobalActor)) {
auto conformance = checkConformance(baseType, globalActor);
if (conformance &&
conformance.getWitnessByName(baseType, ctx.Id_shared) == declRef) {
return ActorIsolation::forGlobalActor(baseType);
}
}
}
return ActorIsolation(ActorInstance, actor, parameterIndex + 1);
}
ActorIsolation ActorIsolation::forActorInstanceSelf(ValueDecl *decl) {
if (auto *fn = dyn_cast<AbstractFunctionDecl>(decl))
return ActorIsolation(ActorInstance, fn->getImplicitSelfDecl(), 0);
if (auto *storage = dyn_cast<AbstractStorageDecl>(decl)) {
if (auto *fn = storage->getAccessor(AccessorKind::Get)) {
return ActorIsolation(ActorInstance, fn->getImplicitSelfDecl(), 0);
}
}
auto *dc = decl->getDeclContext();
return ActorIsolation(ActorInstance, dc->getSelfNominalTypeDecl(), 0);
}
ActorIsolation ActorIsolation::forActorInstanceSelf(NominalTypeDecl *selfDecl) {
return ActorIsolation(ActorInstance, selfDecl, 0);
}
NominalTypeDecl *ActorIsolation::getActor() const {
assert(getKind() == ActorInstance || getKind() == GlobalActor);
if (silParsed)
return nullptr;
if (getKind() == GlobalActor) {
return getGlobalActor()->getAnyNominal();
}
Type actorType;
if (auto *instance = actorInstance.dyn_cast<VarDecl *>()) {
actorType = instance->getTypeInContext();
} else if (auto *expr = actorInstance.dyn_cast<Expr *>()) {
actorType = expr->getType()->getRValueType();
}
if (actorType) {
if (auto wrapped = actorType->getOptionalObjectType()) {
actorType = wrapped;
}
return actorType->getReferenceStorageReferent()->getAnyActor();
}
return actorInstance.get<NominalTypeDecl *>();
}
VarDecl *ActorIsolation::getActorInstance() const {
assert(getKind() == ActorInstance);
if (silParsed)
return nullptr;
return actorInstance.dyn_cast<VarDecl *>();
}
Expr *ActorIsolation::getActorInstanceExpr() const {
assert(getKind() == ActorInstance);
if (silParsed)
return nullptr;
return actorInstance.dyn_cast<Expr *>();
}
bool ActorIsolation::isMainActor() const {
if (silParsed)
return false;
if (isGlobalActor()) {
if (auto *nominal = getGlobalActor()->getAnyNominal())
return nominal->isMainActor();
}
return false;
}
bool ActorIsolation::isDistributedActor() const {
if (silParsed)
return false;
if (getKind() != ActorInstance)
return false;
return getActor()->isDistributedActor();
}
bool ActorIsolation::isEqual(const ActorIsolation &lhs,
const ActorIsolation &rhs) {
if (lhs.getKind() != rhs.getKind())
return false;
switch (lhs.getKind()) {
case Nonisolated:
case NonisolatedUnsafe:
case Unspecified:
return true;
case Erased:
// Different functions with erased isolation have the same *kind* of
// isolation, but we must generally assume that they're not isolated
// the *same way*, which is what this function is apparently supposed
// to answer.
return false;
case ActorInstance: {
auto *lhsActor = lhs.getActorInstance();
auto *rhsActor = rhs.getActorInstance();
if (lhsActor && rhsActor) {
// FIXME: This won't work for arbitrary isolated parameter captures.
if ((lhsActor->isSelfParameter() && rhsActor->isSelfParamCapture()) ||
(lhsActor->isSelfParamCapture() && rhsActor->isSelfParameter())) {
return true;
}
}
// The parameter index doesn't matter; only the actor instance
// values must be equal.
return (lhs.getActor() == rhs.getActor() &&
lhs.actorInstance == rhs.actorInstance);
}
case GlobalActor:
return areTypesEqual(lhs.globalActor, rhs.globalActor);
}
}
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