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1a86cd9c26
Add support for the `Swift` availability domain, which represents availability with respect to the Swift runtime. Use of this domain is restricted by the experimental feature `SwiftRuntimeAvailability`.
415 lines
15 KiB
C++
415 lines
15 KiB
C++
//===--- AvailabilityConstraint.cpp - Swift Availability Constraints ------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/AvailabilityConstraint.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/AvailabilityContext.h"
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#include "swift/AST/Decl.h"
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using namespace swift;
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AvailabilityDomainAndRange
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AvailabilityConstraint::getDomainAndRange(const ASTContext &ctx) const {
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switch (getReason()) {
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case Reason::UnavailableUnconditionally:
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case Reason::UnavailableObsolete:
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return getAttr().getObsoletedDomainAndRange(ctx).value();
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case Reason::UnavailableUnintroduced:
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case Reason::Unintroduced:
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return getAttr().getIntroducedDomainAndRange(ctx).value();
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}
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}
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bool AvailabilityConstraint::isActiveForRuntimeQueries(
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const ASTContext &ctx) const {
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if (getAttr().getPlatform() == PlatformKind::none)
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return true;
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return swift::isPlatformActive(getAttr().getPlatform(), ctx.LangOpts,
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/*forTargetVariant=*/false,
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/*forRuntimeQuery=*/true);
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}
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void AvailabilityConstraint::print(llvm::raw_ostream &os) const {
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os << "AvailabilityConstraint(";
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getAttr().getDomain().print(os);
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os << ", ";
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std::optional<llvm::VersionTuple> version;
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switch (getReason()) {
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case Reason::UnavailableUnconditionally:
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os << "unavailable";
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break;
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case Reason::UnavailableObsolete:
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os << "obsoleted";
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version = getAttr().getObsoleted();
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break;
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case Reason::UnavailableUnintroduced:
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case Reason::Unintroduced:
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os << "introduced";
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version = getAttr().getIntroduced();
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break;
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}
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if (version)
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os << ": " << *version;
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os << ")";
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}
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static bool constraintIsStronger(const AvailabilityConstraint &lhs,
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const AvailabilityConstraint &rhs) {
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DEBUG_ASSERT(lhs.getDomain() == rhs.getDomain());
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// If the constraints have matching domains but different reasons, the
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// constraint with the lowest reason is "strongest".
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if (lhs.getReason() != rhs.getReason())
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return lhs.getReason() < rhs.getReason();
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switch (lhs.getReason()) {
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case AvailabilityConstraint::Reason::UnavailableUnconditionally:
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// Just keep the first.
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return false;
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case AvailabilityConstraint::Reason::UnavailableObsolete:
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// Pick the larger obsoleted range.
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return lhs.getAttr().getObsoleted().value() <
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rhs.getAttr().getObsoleted().value();
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case AvailabilityConstraint::Reason::UnavailableUnintroduced:
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case AvailabilityConstraint::Reason::Unintroduced:
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// Pick the smaller introduced range.
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return lhs.getAttr().getIntroduced().value_or(llvm::VersionTuple()) >
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rhs.getAttr().getIntroduced().value_or(llvm::VersionTuple());
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}
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}
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void addConstraint(llvm::SmallVector<AvailabilityConstraint, 4> &constraints,
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const AvailabilityConstraint &constraint,
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const ASTContext &ctx) {
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auto iter = llvm::find_if(
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constraints, [&constraint](AvailabilityConstraint &existing) {
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return constraint.getDomain() == existing.getDomain();
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});
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// There's no existing constraint for the same domain so just add it.
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if (iter == constraints.end()) {
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constraints.emplace_back(constraint);
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return;
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}
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if (constraintIsStronger(constraint, *iter)) {
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constraints.erase(iter);
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constraints.emplace_back(constraint);
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}
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}
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std::optional<AvailabilityConstraint>
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DeclAvailabilityConstraints::getPrimaryConstraint() const {
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std::optional<AvailabilityConstraint> result;
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auto isStrongerConstraint = [](const AvailabilityConstraint &lhs,
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const AvailabilityConstraint &rhs) {
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// Constraint reasons are defined in descending order of strength.
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if (lhs.getReason() != rhs.getReason())
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return lhs.getReason() < rhs.getReason();
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// Pick the constraint from the broader domain.
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if (lhs.getDomain() != rhs.getDomain())
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return rhs.getDomain().contains(lhs.getDomain());
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return false;
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};
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// Pick the strongest constraint.
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for (auto const &constraint : constraints) {
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if (!result || isStrongerConstraint(constraint, *result))
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result.emplace(constraint);
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}
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return result;
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}
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void DeclAvailabilityConstraints::print(llvm::raw_ostream &os) const {
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os << "{\n";
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llvm::interleave(
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constraints,
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[&os](const AvailabilityConstraint &constraint) {
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os << " " << constraint;
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},
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[&os] { os << ",\n"; });
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os << "\n}";
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}
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static bool canIgnoreConstraintInUnavailableContexts(
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const Decl *decl, const AvailabilityConstraint &constraint,
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const AvailabilityConstraintFlags flags) {
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auto domain = constraint.getDomain();
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// Always reject uses of universally unavailable declarations, regardless
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// of context, since there are no possible compilation configurations in
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// which they are available. However, make an exception for types and
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// conformances, which can sometimes be awkward to avoid references to.
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if (!flags.contains(AvailabilityConstraintFlag::
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AllowUniversallyUnavailableInCompatibleContexts)) {
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if (!isa<TypeDecl>(decl) && !isa<ExtensionDecl>(decl)) {
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if (domain.isUniversal() || domain.isSwiftLanguageMode())
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return false;
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}
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}
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switch (constraint.getReason()) {
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case AvailabilityConstraint::Reason::UnavailableUnconditionally:
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return true;
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case AvailabilityConstraint::Reason::Unintroduced:
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case AvailabilityConstraint::Reason::UnavailableObsolete:
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case AvailabilityConstraint::Reason::UnavailableUnintroduced:
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return domain.isVersioned();
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}
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}
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static bool
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shouldIgnoreConstraintInContext(const Decl *decl,
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const AvailabilityConstraint &constraint,
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const AvailabilityContext &context,
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const AvailabilityConstraintFlags flags) {
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if (!context.isUnavailable())
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return false;
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if (!canIgnoreConstraintInUnavailableContexts(decl, constraint, flags))
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return false;
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return context.containsUnavailableDomain(constraint.getDomain());
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}
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/// Returns the `AvailabilityConstraint` that describes how \p attr restricts
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/// use of \p decl in \p context or `std::nullopt` if there is no restriction.
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static std::optional<AvailabilityConstraint>
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getAvailabilityConstraintForAttr(const Decl *decl,
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const SemanticAvailableAttr &attr,
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const AvailabilityContext &context) {
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// Is the decl unconditionally unavailable?
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if (attr.isUnconditionallyUnavailable())
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return AvailabilityConstraint::unavailableUnconditionally(attr);
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auto &ctx = decl->getASTContext();
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auto domain = attr.getDomain();
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bool domainSupportsRefinement = domain.supportsContextRefinement();
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// Compute the available range in the given context. If there is no explicit
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// range defined by the context, use the deployment range as fallback.
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std::optional<AvailabilityRange> availableRange;
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if (domainSupportsRefinement)
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availableRange = context.getAvailabilityRange(domain, ctx);
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if (!availableRange)
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availableRange = domain.getDeploymentRange(ctx);
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// Is the decl obsoleted in this context?
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if (auto obsoletedRange = attr.getObsoletedRange(ctx)) {
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if (availableRange && availableRange->isContainedIn(*obsoletedRange))
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return AvailabilityConstraint::unavailableObsolete(attr);
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}
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// Is the decl not yet introduced in this context?
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if (auto introducedRange = attr.getIntroducedRange(ctx)) {
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if (!availableRange || !availableRange->isContainedIn(*introducedRange))
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return domainSupportsRefinement
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? AvailabilityConstraint::unintroduced(attr)
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: AvailabilityConstraint::unavailableUnintroduced(attr);
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}
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return std::nullopt;
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}
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/// Returns the most specific platform domain from the availability attributes
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/// attached to \p decl or `std::nullopt` if there are none. Platform specific
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/// `@available` attributes for other platforms should be ignored. For example,
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/// if a declaration has attributes for both iOS and macCatalyst, only the
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/// macCatalyst attributes take effect when compiling for a macCatalyst target.
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static std::optional<AvailabilityDomain>
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activePlatformDomainForDecl(const Decl *decl) {
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std::optional<AvailabilityDomain> activeDomain;
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for (auto attr :
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decl->getSemanticAvailableAttrs(/*includingInactive=*/false)) {
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auto domain = attr.getDomain();
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if (!domain.isPlatform())
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continue;
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if (activeDomain && domain.contains(*activeDomain))
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continue;
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activeDomain.emplace(domain);
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}
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return activeDomain;
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}
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static void getAvailabilityConstraintsForDecl(
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llvm::SmallVector<AvailabilityConstraint, 4> &constraints, const Decl *decl,
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const AvailabilityContext &context, AvailabilityConstraintFlags flags) {
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auto &ctx = decl->getASTContext();
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auto activePlatformDomain = activePlatformDomainForDecl(decl);
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bool includeAllDomains =
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flags.contains(AvailabilityConstraintFlag::IncludeAllDomains);
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for (auto attr : decl->getSemanticAvailableAttrs(includeAllDomains)) {
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auto domain = attr.getDomain();
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if (!includeAllDomains && domain.isPlatform() && activePlatformDomain &&
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!activePlatformDomain->contains(domain))
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continue;
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if (auto constraint = getAvailabilityConstraintForAttr(decl, attr, context))
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addConstraint(constraints, *constraint, ctx);
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}
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// After resolving constraints, remove any constraints that indicate the
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// declaration is unconditionally unavailable in a domain for which
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// the context is already unavailable.
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llvm::erase_if(constraints, [&](const AvailabilityConstraint &constraint) {
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return shouldIgnoreConstraintInContext(decl, constraint, context, flags);
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});
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}
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DeclAvailabilityConstraints
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swift::getAvailabilityConstraintsForDecl(const Decl *decl,
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const AvailabilityContext &context,
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AvailabilityConstraintFlags flags) {
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llvm::SmallVector<AvailabilityConstraint, 4> constraints;
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// Generic parameters are always available.
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if (isa<GenericTypeParamDecl>(decl))
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return DeclAvailabilityConstraints();
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decl = decl->getAbstractSyntaxDeclForAttributes();
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getAvailabilityConstraintsForDecl(constraints, decl, context, flags);
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if (flags.contains(AvailabilityConstraintFlag::SkipEnclosingExtension))
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return constraints;
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// If decl is an extension member, query the attributes of the extension, too.
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//
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// Skip decls imported from Clang, though, as they could be associated to the
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// wrong extension and inherit unavailability incorrectly. ClangImporter
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// associates Objective-C protocol members to the first category where the
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// protocol is directly or indirectly adopted, no matter its availability
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// and the availability of other categories. rdar://problem/53956555
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if (decl->getClangNode())
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return constraints;
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auto parent = decl->parentDeclForAvailability();
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if (auto extension = dyn_cast_or_null<ExtensionDecl>(parent))
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getAvailabilityConstraintsForDecl(constraints, extension, context, flags);
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return constraints;
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}
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std::optional<AvailabilityConstraint>
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swift::getAvailabilityConstraintForDeclInDomain(
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const Decl *decl, const AvailabilityContext &context,
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AvailabilityDomain domain, AvailabilityConstraintFlags flags) {
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auto constraints = getAvailabilityConstraintsForDecl(decl, context, flags);
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for (auto const &constraint : constraints) {
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if (constraint.getDomain().isRelated(domain))
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return constraint;
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}
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return std::nullopt;
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}
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/// Returns true if unsatisfied `@available(..., unavailable)` constraints for
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/// \p domain make code unreachable at runtime
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static bool
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domainCanBeUnconditionallyUnavailableAtRuntime(AvailabilityDomain domain,
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const ASTContext &ctx) {
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switch (domain.getKind()) {
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case AvailabilityDomain::Kind::Universal:
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return true;
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case AvailabilityDomain::Kind::Platform:
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if (ctx.LangOpts.TargetVariant &&
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domain.isActive(ctx, /*forTargetVariant=*/true))
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return true;
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return domain.isActive(ctx);
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case AvailabilityDomain::Kind::SwiftLanguageMode:
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case AvailabilityDomain::Kind::SwiftRuntime:
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case AvailabilityDomain::Kind::PackageDescription:
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return false;
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case AvailabilityDomain::Kind::Embedded:
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return ctx.LangOpts.hasFeature(Feature::Embedded);
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case AvailabilityDomain::Kind::Custom:
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switch (domain.getCustomDomain()->getKind()) {
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case CustomAvailabilityDomain::Kind::Enabled:
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case CustomAvailabilityDomain::Kind::AlwaysEnabled:
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return true;
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case CustomAvailabilityDomain::Kind::Disabled:
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case CustomAvailabilityDomain::Kind::Dynamic:
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return false;
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}
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}
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}
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/// Returns true if unsatisfied introduction constraints for \p domain make
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/// code unreachable at runtime.
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static bool
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domainIsUnavailableAtRuntimeIfUnintroduced(AvailabilityDomain domain,
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const ASTContext &ctx) {
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switch (domain.getKind()) {
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case AvailabilityDomain::Kind::Universal:
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case AvailabilityDomain::Kind::Platform:
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case AvailabilityDomain::Kind::SwiftLanguageMode:
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case AvailabilityDomain::Kind::SwiftRuntime:
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case AvailabilityDomain::Kind::PackageDescription:
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return false;
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case AvailabilityDomain::Kind::Embedded:
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return !ctx.LangOpts.hasFeature(Feature::Embedded);
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case AvailabilityDomain::Kind::Custom:
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switch (domain.getCustomDomain()->getKind()) {
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case CustomAvailabilityDomain::Kind::Enabled:
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case CustomAvailabilityDomain::Kind::AlwaysEnabled:
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case CustomAvailabilityDomain::Kind::Dynamic:
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return false;
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case CustomAvailabilityDomain::Kind::Disabled:
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return true;
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}
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}
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}
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static bool constraintIndicatesRuntimeUnavailability(
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const AvailabilityConstraint &constraint, const ASTContext &ctx) {
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auto domain = constraint.getDomain();
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switch (constraint.getReason()) {
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case AvailabilityConstraint::Reason::UnavailableUnconditionally:
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return domainCanBeUnconditionallyUnavailableAtRuntime(domain, ctx);
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case AvailabilityConstraint::Reason::UnavailableObsolete:
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case AvailabilityConstraint::Reason::UnavailableUnintroduced:
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return false;
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case AvailabilityConstraint::Reason::Unintroduced:
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return domainIsUnavailableAtRuntimeIfUnintroduced(domain, ctx);
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}
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}
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void swift::getRuntimeUnavailableDomains(
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const DeclAvailabilityConstraints &constraints,
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llvm::SmallVectorImpl<AvailabilityDomain> &domains, const ASTContext &ctx) {
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for (auto constraint : constraints) {
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if (constraintIndicatesRuntimeUnavailability(constraint, ctx))
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domains.push_back(constraint.getDomain());
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}
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}
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