swift/lib/AST/Effects.cpp at main · swiftlang/swift · GitHub

Name: swift/lib/AST/Effects.cpp at main · swiftlang/swift · GitHub
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//===--- Effects.cpp - Effect Checking ASTs -------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//
//
// This file implements some logic for rethrows and reasync checking.
//
//===----------------------------------------------------------------------===//

#include"swift/AST/ASTContext.h"
#include"swift/AST/Effects.h"
#include"swift/AST/Evaluator.h"
#include"swift/AST/Decl.h"
#include"swift/AST/ProtocolConformanceRef.h"
#include"swift/AST/Type.h"
#include"swift/AST/Types.h"
#include"swift/AST/TypeCheckRequests.h"
#include"llvm/ADT/ArrayRef.h"
#include"llvm/Support/raw_ostream.h"

usingnamespaceswift;

boolAnyFunctionType::hasEffect(EffectKind kind) const {
switch (kind) {
case EffectKind::Throws: returngetExtInfo().isThrowing();
case EffectKind::Async: returngetExtInfo().isAsync();
case EffectKind::Unsafe: returnfalse;
 }
llvm_unreachable("Bad effect kind");
}

voidswift::simple_display(llvm::raw_ostream &out, const EffectKind kind) {
switch (kind) {
case EffectKind::Throws: out << "throws"; return;
case EffectKind::Async: out << "async"; return;
case EffectKind::Unsafe: out << "@unsafe"; return;
 }
llvm_unreachable("Bad effect kind");
}

voidswift::simple_display(llvm::raw_ostream &out,
const PolymorphicEffectRequirementList list) {
for (auto req : list.getRequirements()) {
simple_display(out, req);
 out << "\n";
 }

for (auto conf : list.getConformances()) {
simple_display(out, conf.first);
 out << " : ";
simple_display(out, conf.second);
llvm::errs() << "\n";
 }
}

PolymorphicEffectRequirementList
ProtocolDecl::getPolymorphicEffectRequirements(EffectKind kind) const {
returnevaluateOrDefault(getASTContext().evaluator,
 PolymorphicEffectRequirementsRequest{kind, const_cast<ProtocolDecl *>(this)},
PolymorphicEffectRequirementList());
}

boolProtocolDecl::hasPolymorphicEffect(EffectKind kind) const {
switch (kind) {
case EffectKind::Throws:
returngetAttrs().hasAttribute<swift::AtRethrowsAttr>();
case EffectKind::Async:
returngetAttrs().hasAttribute<swift::AtReasyncAttr>();
case EffectKind::Unsafe:
returnfalse;
 }
llvm_unreachable("Bad effect kind");
}

boolAbstractFunctionDecl::hasEffect(EffectKind kind) const {
switch (kind) {
case EffectKind::Throws:
returnhasThrows();
case EffectKind::Async:
returnhasAsync();
case EffectKind::Unsafe:
returngetExplicitSafety() == ExplicitSafety::Unsafe;
 }
llvm_unreachable("Bad effect kind");
}

boolAbstractFunctionDecl::hasPolymorphicEffect(EffectKind kind) const {
switch (kind) {
case EffectKind::Throws:
returngetAttrs().hasAttribute<swift::RethrowsAttr>();
case EffectKind::Async:
returngetAttrs().hasAttribute<swift::ReasyncAttr>();
case EffectKind::Unsafe:
returnfalse;
 }
llvm_unreachable("Bad effect kind");
}

PolymorphicEffectKind
AbstractFunctionDecl::getPolymorphicEffectKind(EffectKind kind) const {
returnevaluateOrDefault(getASTContext().evaluator,
 PolymorphicEffectKindRequest{kind, const_cast<AbstractFunctionDecl *>(this)},
 PolymorphicEffectKind::Invalid);
}

voidswift::simple_display(llvm::raw_ostream &out,
 PolymorphicEffectKind kind) {
switch (kind) {
case PolymorphicEffectKind::None:
 out << "none";
break;
case PolymorphicEffectKind::ByClosure:
 out << "by closure";
break;
case PolymorphicEffectKind::ByConformance:
 out << "by conformance";
break;
case PolymorphicEffectKind::AsyncSequenceRethrows:
 out << "by async sequence implicit @rethrows";
break;
case PolymorphicEffectKind::Always:
 out << "always";
break;
case PolymorphicEffectKind::Invalid:
 out << "invalid";
break;
 }
}

boolProtocolConformanceRef::hasEffect(EffectKind kind) const {
if (!isConcrete()) { return kind != EffectKind::Unsafe; }
returnevaluateOrDefault(getProtocol()->getASTContext().evaluator,
 ConformanceHasEffectRequest{kind, getConcrete()},
true);
}