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bb7a563e6c
This couples together several changes to move entirely from
`@rethrows` over to typed throws:
* Use the `Failure` type to determine whether an async for-each loop
will throw, rather than depending on rethrows checking
* Introduce a special carve-out for `rethrows` functions that have a
generic requirement on an `AsyncSequence` or `AsyncIteratorProtocol`,
which uses that requirement's `Failure` type as potentially being part
of the thrown error type. This allows existing generic functions like
the following to continue to work:
func f<S: AsyncSequence>(_: S) rethrows
* Switch SIL generation for the async for-each loop from the prior
`next()` over to the typed-throws version `_nextElement`.
* Remove `@rethrows` from `AsyncSequence` and `AsyncIteratorProtocol`
entirely. We are now fully dependent on typed throws.
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
//===--- Effects.cpp - Effect Checking ASTs -------------------------------===//
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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 - 2018 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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//
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// This file implements some logic for rethrows and reasync checking.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/Effects.h"
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#include "swift/AST/Evaluator.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/ProtocolConformanceRef.h"
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#include "swift/AST/Type.h"
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#include "swift/AST/Types.h"
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#include "swift/AST/TypeCheckRequests.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace swift;
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bool AnyFunctionType::hasEffect(EffectKind kind) const {
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switch (kind) {
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case EffectKind::Throws: return getExtInfo().isThrowing();
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case EffectKind::Async: return getExtInfo().isAsync();
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}
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llvm_unreachable("Bad effect kind");
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}
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void swift::simple_display(llvm::raw_ostream &out, const EffectKind kind) {
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switch (kind) {
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case EffectKind::Throws: out << "throws"; return;
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case EffectKind::Async: out << "async"; return;
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}
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llvm_unreachable("Bad effect kind");
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}
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void swift::simple_display(llvm::raw_ostream &out,
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const PolymorphicEffectRequirementList list) {
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for (auto req : list.getRequirements()) {
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simple_display(out, req);
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out << "\n";
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}
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for (auto conf : list.getConformances()) {
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simple_display(out, conf.first);
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out << " : ";
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simple_display(out, conf.second);
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llvm::errs() << "\n";
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}
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}
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PolymorphicEffectRequirementList
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ProtocolDecl::getPolymorphicEffectRequirements(EffectKind kind) const {
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return evaluateOrDefault(getASTContext().evaluator,
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PolymorphicEffectRequirementsRequest{kind, const_cast<ProtocolDecl *>(this)},
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PolymorphicEffectRequirementList());
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}
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bool ProtocolDecl::hasPolymorphicEffect(EffectKind kind) const {
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switch (kind) {
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case EffectKind::Throws:
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return getAttrs().hasAttribute<swift::AtRethrowsAttr>();
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case EffectKind::Async:
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return getAttrs().hasAttribute<swift::AtReasyncAttr>();
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}
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llvm_unreachable("Bad effect kind");
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}
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bool AbstractFunctionDecl::hasEffect(EffectKind kind) const {
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switch (kind) {
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case EffectKind::Throws:
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return hasThrows();
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case EffectKind::Async:
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return hasAsync();
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}
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llvm_unreachable("Bad effect kind");
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}
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bool AbstractFunctionDecl::hasPolymorphicEffect(EffectKind kind) const {
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switch (kind) {
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case EffectKind::Throws:
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return getAttrs().hasAttribute<swift::RethrowsAttr>();
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case EffectKind::Async:
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return getAttrs().hasAttribute<swift::ReasyncAttr>();
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}
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llvm_unreachable("Bad effect kind");
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}
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PolymorphicEffectKind
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AbstractFunctionDecl::getPolymorphicEffectKind(EffectKind kind) const {
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return evaluateOrDefault(getASTContext().evaluator,
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PolymorphicEffectKindRequest{kind, const_cast<AbstractFunctionDecl *>(this)},
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PolymorphicEffectKind::Invalid);
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}
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void swift::simple_display(llvm::raw_ostream &out,
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PolymorphicEffectKind kind) {
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switch (kind) {
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case PolymorphicEffectKind::None:
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out << "none";
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break;
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case PolymorphicEffectKind::ByClosure:
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out << "by closure";
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break;
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case PolymorphicEffectKind::ByConformance:
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out << "by conformance";
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break;
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case PolymorphicEffectKind::AsyncSequenceRethrows:
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out << "by async sequence implicit @rethrows";
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break;
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case PolymorphicEffectKind::Always:
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out << "always";
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break;
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case PolymorphicEffectKind::Invalid:
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out << "invalid";
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break;
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}
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}
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bool ProtocolConformanceRef::hasEffect(EffectKind kind) const {
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if (!isConcrete()) { return true; }
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return evaluateOrDefault(getRequirement()->getASTContext().evaluator,
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ConformanceHasEffectRequest{kind, getConcrete()},
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true);
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}
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