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PrintAsObjC.cpp
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//===--- PrintAsObjC.cpp - Emit a header file for a Swift AST -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "swift/PrintAsObjC/PrintAsObjC.h"
#include "swift/Strings.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/TypeVisitor.h"
#include "swift/AST/SwiftNameTranslation.h"
#include "swift/AST/Comment.h"
#include "swift/Basic/StringExtras.h"
#include "swift/Basic/Version.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/Frontend/Frontend.h"
#include "swift/Frontend/PrintingDiagnosticConsumer.h"
#include "swift/IDE/CommentConversion.h"
#include "swift/Parse/Lexer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/Module.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
using namespace swift::objc_translation;
static bool isNSObjectOrAnyHashable(ASTContext &ctx, Type type) {
if (auto classDecl = type->getClassOrBoundGenericClass()) {
return classDecl->getName()
== ctx.getSwiftId(KnownFoundationEntity::NSObject) &&
classDecl->getModuleContext()->getName() == ctx.Id_ObjectiveC;
}
if (auto nomDecl = type->getAnyNominal()) {
return nomDecl == ctx.getAnyHashableDecl();
}
return false;
}
static bool isAnyObjectOrAny(Type type) {
return type->isAnyObject() || type->isAny();
}
/// Returns true if \p name matches a keyword in any Clang language mode.
static bool isClangKeyword(Identifier name) {
static const llvm::DenseSet<StringRef> keywords = []{
llvm::DenseSet<StringRef> set;
// FIXME: clang::IdentifierInfo /nearly/ has the API we need to do this
// in a more principled way, but not quite.
#define KEYWORD(SPELLING, FLAGS) \
set.insert(#SPELLING);
#define CXX_KEYWORD_OPERATOR(SPELLING, TOK) \
set.insert(#SPELLING);
#include "clang/Basic/TokenKinds.def"
return set;
}();
if (name.empty())
return false;
return keywords.find(name.str()) != keywords.end();
}
namespace {
/// Whether the type being printed is in function param position.
enum IsFunctionParam_t : bool {
IsFunctionParam = true,
IsNotFunctionParam = false,
};
} // end anonymous namespace
/// Returns true if the given selector might be classified as an init method
/// by Objective-C ARC.
static bool looksLikeInitMethod(ObjCSelector selector) {
ArrayRef<Identifier> selectorPieces = selector.getSelectorPieces();
assert(!selectorPieces.empty());
auto firstPiece = selectorPieces.front().str();
if (!firstPiece.startswith("init")) return false;
return !(firstPiece.size() > 4 && clang::isLowercase(firstPiece[4]));
}
/// Returns the name of an <os/object.h> type minus the leading "OS_",
/// or an empty string if \p decl is not an <os/object.h> type.
static StringRef maybeGetOSObjectBaseName(const clang::NamedDecl *decl) {
StringRef name = decl->getName();
if (!name.consume_front("OS_"))
return StringRef();
clang::SourceLocation loc = decl->getLocation();
if (!loc.isMacroID())
return StringRef();
// Hack: check to see if the name came from a macro in <os/object.h>.
clang::SourceManager &sourceMgr = decl->getASTContext().getSourceManager();
clang::SourceLocation expansionLoc =
sourceMgr.getImmediateExpansionRange(loc).getBegin();
clang::SourceLocation spellingLoc = sourceMgr.getSpellingLoc(expansionLoc);
if (!sourceMgr.getFilename(spellingLoc).endswith("/os/object.h"))
return StringRef();
return name;
}
/// Returns true if \p decl represents an <os/object.h> type.
static bool isOSObjectType(const clang::Decl *decl) {
auto *named = dyn_cast_or_null<clang::NamedDecl>(decl);
if (!named)
return false;
return !maybeGetOSObjectBaseName(named).empty();
}
namespace {
using DelayedMemberSet = llvm::SmallSetVector<const ValueDecl *, 32>;
class ObjCPrinter : private DeclVisitor<ObjCPrinter>,
private TypeVisitor<ObjCPrinter, void,
Optional<OptionalTypeKind>>
{
friend ASTVisitor;
friend TypeVisitor;
using NameAndOptional = std::pair<StringRef, bool>;
llvm::DenseMap<std::pair<Identifier, Identifier>, NameAndOptional>
specialNames;
Identifier ID_CFTypeRef;
ModuleDecl &M;
raw_ostream &os;
SmallVector<const FunctionType *, 4> openFunctionTypes;
const DelayedMemberSet &delayedMembers;
AccessLevel minRequiredAccess;
bool protocolMembersOptional = false;
Optional<Type> NSCopyingType;
friend ASTVisitor<ObjCPrinter>;
friend TypeVisitor<ObjCPrinter>;
public:
explicit ObjCPrinter(ModuleDecl &mod, raw_ostream &out,
DelayedMemberSet &delayed, AccessLevel access)
: M(mod), os(out), delayedMembers(delayed), minRequiredAccess(access) {}
void print(const Decl *D) {
PrettyStackTraceDecl trace("printing", D);
ASTVisitor::visit(const_cast<Decl *>(D));
}
void maybePrintObjCGenericParameters(const ClassDecl *importedClass) {
auto *clangDecl = importedClass->getClangDecl();
auto *objcClass = dyn_cast_or_null<clang::ObjCInterfaceDecl>(clangDecl);
if (!objcClass)
return;
if (!objcClass->getTypeParamList())
return;
assert(objcClass->getTypeParamList()->size() != 0);
os << "<";
interleave(*objcClass->getTypeParamList(),
[this](const clang::ObjCTypeParamDecl *param) {
os << param->getName();
},
[this] { os << ", "; });
os << ">";
}
void printAdHocCategory(iterator_range<const ValueDecl * const *> members) {
assert(members.begin() != members.end());
const DeclContext *origDC = (*members.begin())->getDeclContext();
auto *baseClass = origDC->getSelfClassDecl();
os << "@interface " << getNameForObjC(baseClass);
maybePrintObjCGenericParameters(baseClass);
os << " (SWIFT_EXTENSION(" << origDC->getParentModule()->getName()
<< "))\n";
printMembers</*allowDelayed*/true>(members);
os << "@end\n\n";
}
bool shouldInclude(const ValueDecl *VD) {
return isVisibleToObjC(VD, minRequiredAccess) &&
!VD->getAttrs().hasAttribute<ImplementationOnlyAttr>();
}
private:
/// Prints a protocol adoption list: <code><NSCoding, NSCopying></code>
///
/// This method filters out non-ObjC protocols.
void printProtocols(ArrayRef<ProtocolDecl *> protos) {
SmallVector<ProtocolDecl *, 4> protosToPrint;
std::copy_if(protos.begin(), protos.end(),
std::back_inserter(protosToPrint),
[this](const ProtocolDecl *PD) -> bool {
return shouldInclude(PD);
});
// Drop protocols from the list that are implied by other protocols.
ProtocolType::canonicalizeProtocols(protosToPrint);
if (protosToPrint.empty())
return;
os << " <";
interleave(protosToPrint,
[this](const ProtocolDecl *PD) { os << getNameForObjC(PD); },
[this] { os << ", "; });
os << ">";
}
/// Prints the members of a class, extension, or protocol.
template <bool AllowDelayed = false, typename R>
void printMembers(R &&members) {
for (const Decl *member : members) {
auto VD = dyn_cast<ValueDecl>(member);
if (!VD || !shouldInclude(VD) || isa<TypeDecl>(VD))
continue;
if (isa<AccessorDecl>(VD))
continue;
if (!AllowDelayed && delayedMembers.count(VD)) {
os << "// '" << VD->getFullName() << "' below\n";
continue;
}
if (VD->getAttrs().hasAttribute<OptionalAttr>() != protocolMembersOptional) {
protocolMembersOptional = VD->getAttrs().hasAttribute<OptionalAttr>();
os << (protocolMembersOptional ? "@optional\n" : "@required\n");
}
ASTVisitor::visit(const_cast<ValueDecl*>(VD));
}
}
void printDocumentationComment(Decl *D) {
swift::markup::MarkupContext MC;
auto DC = getSingleDocComment(MC, D);
if (DC)
ide::getDocumentationCommentAsDoxygen(DC, os);
}
/// Prints an encoded string, escaped properly for C.
void printEncodedString(StringRef str, bool includeQuotes = true) {
// NB: We don't use raw_ostream::write_escaped() because it does hex escapes
// for non-ASCII chars.
llvm::SmallString<128> Buf;
StringRef decodedStr = Lexer::getEncodedStringSegment(str, Buf);
if (includeQuotes) os << '"';
for (unsigned char c : decodedStr) {
switch (c) {
case '\\':
os << '\\' << '\\';
break;
case '\t':
os << '\\' << 't';
break;
case '\n':
os << '\\' << 'n';
break;
case '"':
os << '\\' << '"';
break;
default:
if (c < 0x20 || c == 0x7F) {
os << '\\' << 'x';
os << llvm::hexdigit((c >> 4) & 0xF);
os << llvm::hexdigit((c >> 0) & 0xF);
} else {
os << c;
}
}
}
if (includeQuotes) os << '"';
}
// For a given Decl and Type, if the type is not an optional return
// the type and OTK_None as the optionality. If the type is
// optional, return the underlying object type, and an optionality
// that is based on the type but overridden by the
// ImplicitlyUnwrappedOptionalAttr on the decl.
static std::pair<Type, OptionalTypeKind>
getObjectTypeAndOptionality(const Decl *D, Type ty) {
OptionalTypeKind kind;
if (auto objTy =
ty->getReferenceStorageReferent()->getOptionalObjectType()) {
kind = OTK_Optional;
if (D->getAttrs().hasAttribute<ImplicitlyUnwrappedOptionalAttr>())
kind = OTK_ImplicitlyUnwrappedOptional;
return {objTy, kind};
}
return {ty, OTK_None};
}
// Ignore other declarations.
void visitDecl(Decl *D) {}
void visitClassDecl(ClassDecl *CD) {
printDocumentationComment(CD);
// This is just for testing, so we check explicitly for the attribute instead
// of asking if the class is weak imported. If the class has availablility,
// we'll print a SWIFT_AVAIALBLE() which implies __attribute__((weak_imported))
// already.
if (CD->getAttrs().hasAttribute<WeakLinkedAttr>())
os << "SWIFT_WEAK_IMPORT\n";
bool hasResilientAncestry =
CD->checkAncestry().contains(AncestryFlags::ResilientOther);
if (hasResilientAncestry) {
os << "SWIFT_RESILIENT_CLASS";
} else {
os << "SWIFT_CLASS";
}
StringRef customName = getNameForObjC(CD, CustomNamesOnly);
if (customName.empty()) {
llvm::SmallString<32> scratch;
os << "(\"" << CD->getObjCRuntimeName(scratch) << "\")";
printAvailability(CD);
os << "\n@interface " << CD->getName();
} else {
os << "_NAMED(\"" << CD->getName() << "\")";
printAvailability(CD);
os << "\n@interface " << customName;
}
if (auto superDecl = CD->getSuperclassDecl())
os << " : " << getNameForObjC(superDecl);
printProtocols(CD->getLocalProtocols(ConformanceLookupKind::OnlyExplicit));
os << "\n";
printMembers(CD->getMembers());
os << "@end\n";
}
bool isEmptyExtensionDecl(ExtensionDecl *ED) {
auto members = ED->getMembers();
auto hasMembers = std::any_of(members.begin(), members.end(),
[this](const Decl *D) -> bool {
if (auto VD = dyn_cast<ValueDecl>(D))
if (shouldInclude(VD))
return true;
return false;
});
auto protocols = ED->getLocalProtocols(ConformanceLookupKind::OnlyExplicit);
auto hasProtocols = std::any_of(protocols.begin(), protocols.end(),
[this](const ProtocolDecl *PD) -> bool {
return shouldInclude(PD);
});
return (!hasMembers && !hasProtocols);
}
void visitExtensionDecl(ExtensionDecl *ED) {
if (isEmptyExtensionDecl(ED))
return;
auto baseClass = ED->getSelfClassDecl();
if (printAvailability(ED, PrintLeadingSpace::No))
os << "\n";
os << "@interface " << getNameForObjC(baseClass);
maybePrintObjCGenericParameters(baseClass);
os << " (SWIFT_EXTENSION(" << ED->getModuleContext()->getName() << "))";
printProtocols(ED->getLocalProtocols(ConformanceLookupKind::OnlyExplicit));
os << "\n";
printMembers(ED->getMembers());
os << "@end\n";
}
void visitProtocolDecl(ProtocolDecl *PD) {
printDocumentationComment(PD);
StringRef customName = getNameForObjC(PD, CustomNamesOnly);
if (customName.empty()) {
llvm::SmallString<32> scratch;
os << "SWIFT_PROTOCOL(\"" << PD->getObjCRuntimeName(scratch) << "\")";
printAvailability(PD);
os << "\n@protocol " << PD->getName();
} else {
os << "SWIFT_PROTOCOL_NAMED(\"" << PD->getName() << "\")";
printAvailability(PD);
os << "\n@protocol " << customName;
}
printProtocols(PD->getInheritedProtocols());
os << "\n";
assert(!protocolMembersOptional && "protocols start required");
printMembers(PD->getMembers());
protocolMembersOptional = false;
os << "@end\n";
}
void visitEnumDecl(EnumDecl *ED) {
printDocumentationComment(ED);
os << "typedef ";
StringRef customName = getNameForObjC(ED, CustomNamesOnly);
if (customName.empty()) {
os << "SWIFT_ENUM(";
} else {
os << "SWIFT_ENUM_NAMED(";
}
print(ED->getRawType(), OTK_None);
if (customName.empty()) {
os << ", " << ED->getName();
} else {
os << ", " << customName
<< ", \"" << ED->getName() << "\"";
}
os << ", "
<< (ED->isFormallyExhaustive(/*useDC*/nullptr) ? "closed" : "open")
<< ") {\n";
for (auto Elt : ED->getAllElements()) {
printDocumentationComment(Elt);
// Print the cases as the concatenation of the enum name with the case
// name.
os << " ";
if (printSwiftEnumElemNameInObjC(Elt, os)) {
os << " SWIFT_COMPILE_NAME(\"" << Elt->getName() << "\")";
}
if (auto ILE = cast_or_null<IntegerLiteralExpr>(Elt->getRawValueExpr())) {
os << " = ";
if (ILE->isNegative())
os << "-";
os << ILE->getDigitsText();
}
os << ",\n";
}
os << "};\n";
}
void printSingleMethodParam(StringRef selectorPiece,
const ParamDecl *param,
const clang::ParmVarDecl *clangParam,
bool isNSUIntegerSubscript,
bool isLastPiece) {
os << selectorPiece << ":(";
if ((isNSUIntegerSubscript && isLastPiece) ||
(clangParam && isNSUInteger(clangParam->getType()))) {
os << "NSUInteger";
} else {
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) =
getObjectTypeAndOptionality(param, param->getInterfaceType());
print(objTy, kind, Identifier(), IsFunctionParam);
}
os << ")";
if (!param->hasName()) {
os << "_";
} else {
Identifier name = param->getName();
os << name;
if (isClangKeyword(name))
os << "_";
}
}
template <typename T>
static const T *findClangBase(const T *member) {
while (member) {
if (member->getClangDecl())
return member;
member = member->getOverriddenDecl();
}
return nullptr;
}
/// Returns true if \p clangTy is the typedef for NSUInteger.
bool isNSUInteger(clang::QualType clangTy) {
const auto *typedefTy = dyn_cast<clang::TypedefType>(clangTy);
if (!typedefTy)
return false;
const clang::IdentifierInfo *nameII = typedefTy->getDecl()->getIdentifier();
if (!nameII)
return false;
if (nameII->getName() != "NSUInteger")
return false;
return true;
}
Type getForeignResultType(AbstractFunctionDecl *AFD,
FunctionType *methodTy,
Optional<ForeignErrorConvention> errorConvention) {
// A foreign error convention can affect the result type as seen in
// Objective-C.
if (errorConvention) {
switch (errorConvention->getKind()) {
case ForeignErrorConvention::ZeroResult:
case ForeignErrorConvention::NonZeroResult:
// The error convention provides the result type.
return errorConvention->getResultType();
case ForeignErrorConvention::NilResult:
// Errors are propagated via 'nil' returns.
return OptionalType::get(methodTy->getResult());
case ForeignErrorConvention::NonNilError:
case ForeignErrorConvention::ZeroPreservedResult:
break;
}
}
auto result = methodTy->getResult();
if (result->isUninhabited())
return M.getASTContext().TheEmptyTupleType;
return result;
}
/// Returns true if \p sel is the no-argument selector 'init'.
static bool selectorIsInit(ObjCSelector sel) {
return sel.getNumArgs() == 0 &&
sel.getSelectorPieces().front().str() == "init";
}
void printAbstractFunctionAsMethod(AbstractFunctionDecl *AFD,
bool isClassMethod,
bool isNSUIntegerSubscript = false) {
printDocumentationComment(AFD);
if (isClassMethod)
os << "+ (";
else
os << "- (";
const clang::ObjCMethodDecl *clangMethod = nullptr;
if (!isNSUIntegerSubscript) {
if (const AbstractFunctionDecl *clangBase = findClangBase(AFD)) {
clangMethod =
dyn_cast_or_null<clang::ObjCMethodDecl>(clangBase->getClangDecl());
}
}
Optional<ForeignErrorConvention> errorConvention
= AFD->getForeignErrorConvention();
Type rawMethodTy = AFD->getMethodInterfaceType();
auto methodTy = rawMethodTy->castTo<FunctionType>();
auto resultTy = getForeignResultType(AFD, methodTy, errorConvention);
// Constructors and methods returning DynamicSelf return
// instancetype.
if (isa<ConstructorDecl>(AFD) ||
(isa<FuncDecl>(AFD) && cast<FuncDecl>(AFD)->hasDynamicSelfResult())) {
if (errorConvention && errorConvention->stripsResultOptionality()) {
printNullability(OTK_Optional, NullabilityPrintKind::ContextSensitive);
} else if (auto ctor = dyn_cast<ConstructorDecl>(AFD)) {
printNullability(ctor->getFailability(),
NullabilityPrintKind::ContextSensitive);
} else {
auto func = cast<FuncDecl>(AFD);
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) =
getObjectTypeAndOptionality(func, func->getResultInterfaceType());
printNullability(kind,
NullabilityPrintKind::ContextSensitive);
}
os << "instancetype";
} else if (resultTy->isVoid() &&
AFD->getAttrs().hasAttribute<IBActionAttr>()) {
os << "IBAction";
} else if (clangMethod && isNSUInteger(clangMethod->getReturnType())) {
os << "NSUInteger";
} else {
// IBSegueAction is placed before whatever return value is chosen.
if (AFD->getAttrs().hasAttribute<IBSegueActionAttr>()) {
os << "IBSegueAction ";
}
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) = getObjectTypeAndOptionality(AFD, resultTy);
print(objTy, kind);
}
os << ")";
auto selector = AFD->getObjCSelector();
ArrayRef<Identifier> selectorPieces = selector.getSelectorPieces();
const auto ¶ms = AFD->getParameters()->getArray();
unsigned paramIndex = 0;
for (unsigned i = 0, n = selectorPieces.size(); i != n; ++i) {
if (i > 0) os << ' ';
// Retrieve the selector piece.
StringRef piece = selectorPieces[i].empty() ? StringRef("")
: selectorPieces[i].str();
// If we have an error convention and this is the error
// parameter, print it.
if (errorConvention && i == errorConvention->getErrorParameterIndex()) {
os << piece << ":(";
print(errorConvention->getErrorParameterType(), None);
os << ")error";
continue;
}
// Zero-parameter initializers with a long selector.
if (isa<ConstructorDecl>(AFD) &&
cast<ConstructorDecl>(AFD)->isObjCZeroParameterWithLongSelector()) {
os << piece;
continue;
}
// Zero-parameter methods.
if (params.empty()) {
assert(paramIndex == 0);
os << piece;
paramIndex = 1;
continue;
}
const clang::ParmVarDecl *clangParam = nullptr;
if (clangMethod)
clangParam = clangMethod->parameters()[paramIndex];
// Single-parameter methods.
printSingleMethodParam(piece, params[paramIndex], clangParam,
isNSUIntegerSubscript, i == n-1);
++paramIndex;
}
bool skipAvailability = false;
bool makeNewUnavailable = false;
bool makeNewExplicitlyAvailable = false;
// Swift designated initializers are Objective-C designated initializers.
if (auto ctor = dyn_cast<ConstructorDecl>(AFD)) {
if (ctor->hasStubImplementation()
|| ctor->getFormalAccess() < minRequiredAccess) {
// This will only be reached if the overridden initializer has the
// required access
os << " SWIFT_UNAVAILABLE";
skipAvailability = true;
// If -init is unavailable, then +new should be, too:
makeNewUnavailable = selectorIsInit(selector);
} else {
if (ctor->isDesignatedInit() &&
!isa<ProtocolDecl>(ctor->getDeclContext())) {
os << " OBJC_DESIGNATED_INITIALIZER";
}
// If -init is newly available, +new should be as well if the class
// inherits from NSObject.
if (selectorIsInit(selector) && !ctor->getOverriddenDecl()) {
auto container = ctor->getDeclContext();
auto *classDecl = container->getSelfClassDecl();
if (!classDecl) {
assert(container->getSelfProtocolDecl());
} else {
while (classDecl->hasSuperclass()) {
classDecl = classDecl->getSuperclassDecl();
assert(classDecl &&
"shouldn't PrintAsObjC with invalid superclasses");
}
if (classDecl->hasClangNode() &&
classDecl->getNameStr() == "NSObject") {
makeNewExplicitlyAvailable = true;
}
}
}
}
if (!looksLikeInitMethod(AFD->getObjCSelector())) {
os << " SWIFT_METHOD_FAMILY(init)";
}
} else {
if (looksLikeInitMethod(AFD->getObjCSelector())) {
os << " SWIFT_METHOD_FAMILY(none)";
}
if (methodTy->getResult()->isUninhabited()) {
os << " SWIFT_NORETURN";
} else if (!methodTy->getResult()->isVoid() &&
!AFD->getAttrs().hasAttribute<DiscardableResultAttr>()) {
os << " SWIFT_WARN_UNUSED_RESULT";
}
}
if (!skipAvailability) {
printAvailability(AFD);
}
if (auto accessor = dyn_cast<AccessorDecl>(AFD)) {
printSwift3ObjCDeprecatedInference(accessor->getStorage());
} else {
printSwift3ObjCDeprecatedInference(AFD);
}
os << ";\n";
if (makeNewUnavailable) {
assert(!makeNewExplicitlyAvailable);
// Downgrade this to a warning in pre-Swift-5 mode. This isn't perfect
// because it's a diagnostic inflicted on /clients/, but it's close
// enough. It really is invalid to call +new when -init is unavailable.
StringRef annotationName = "SWIFT_UNAVAILABLE_MSG";
if (!M.getASTContext().isSwiftVersionAtLeast(5))
annotationName = "SWIFT_DEPRECATED_MSG";
os << "+ (nonnull instancetype)new " << annotationName
<< "(\"-init is unavailable\");\n";
} else if (makeNewExplicitlyAvailable) {
os << "+ (nonnull instancetype)new;\n";
}
}
void printAbstractFunctionAsFunction(FuncDecl *FD) {
printDocumentationComment(FD);
Optional<ForeignErrorConvention> errorConvention
= FD->getForeignErrorConvention();
assert(!FD->getGenericSignature() &&
"top-level generic functions not supported here");
auto funcTy = FD->getInterfaceType()->castTo<FunctionType>();
auto resultTy = getForeignResultType(FD, funcTy, errorConvention);
// The result type may be a partial function type we need to close
// up later.
PrintMultiPartType multiPart(*this);
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) = getObjectTypeAndOptionality(FD, resultTy);
visitPart(objTy, kind);
assert(FD->getAttrs().hasAttribute<CDeclAttr>()
&& "not a cdecl function");
os << ' ' << FD->getAttrs().getAttribute<CDeclAttr>()->Name << '(';
auto params = FD->getParameters();
if (params->size()) {
interleave(*params,
[&](const ParamDecl *param) {
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) = getObjectTypeAndOptionality(
param, param->getInterfaceType());
print(objTy, kind, param->getName(), IsFunctionParam);
},
[&] { os << ", "; });
} else {
os << "void";
}
os << ')';
// Finish the result type.
multiPart.finish();
if (funcTy->getResult()->isUninhabited()) {
os << " SWIFT_NORETURN";
} else if (!funcTy->getResult()->isVoid() &&
!FD->getAttrs().hasAttribute<DiscardableResultAttr>()) {
os << " SWIFT_WARN_UNUSED_RESULT";
}
printAvailability(FD);
os << ';';
}
enum class PrintLeadingSpace : bool {
No = false,
Yes = true
};
/// Returns \c true if anything was printed.
bool printAvailability(const Decl *D, PrintLeadingSpace printLeadingSpace =
PrintLeadingSpace::Yes) {
bool hasPrintedAnything = false;
auto maybePrintLeadingSpace = [&] {
if (printLeadingSpace == PrintLeadingSpace::Yes || hasPrintedAnything)
os << " ";
hasPrintedAnything = true;
};
for (auto AvAttr : D->getAttrs().getAttributes<AvailableAttr>()) {
if (AvAttr->Platform == PlatformKind::none) {
if (AvAttr->PlatformAgnostic ==
PlatformAgnosticAvailabilityKind::Unavailable) {
// Availability for *
if (!AvAttr->Rename.empty() && isa<ValueDecl>(D)) {
// rename
maybePrintLeadingSpace();
os << "SWIFT_UNAVAILABLE_MSG(\"'"
<< cast<ValueDecl>(D)->getBaseName()
<< "' has been renamed to '";
printRenameForDecl(AvAttr, cast<ValueDecl>(D), false);
os << '\'';
if (!AvAttr->Message.empty()) {
os << ": ";
printEncodedString(AvAttr->Message, false);
}
os << "\")";
} else if (!AvAttr->Message.empty()) {
maybePrintLeadingSpace();
os << "SWIFT_UNAVAILABLE_MSG(";
printEncodedString(AvAttr->Message);
os << ")";
} else {
maybePrintLeadingSpace();
os << "SWIFT_UNAVAILABLE";
}
break;
}
if (AvAttr->isUnconditionallyDeprecated()) {
if (!AvAttr->Rename.empty() || !AvAttr->Message.empty()) {
maybePrintLeadingSpace();
os << "SWIFT_DEPRECATED_MSG(";
printEncodedString(AvAttr->Message);
if (!AvAttr->Rename.empty()) {
os << ", ";
printRenameForDecl(AvAttr, cast<ValueDecl>(D), true);
}
os << ")";
} else {
maybePrintLeadingSpace();
os << "SWIFT_DEPRECATED";
}
}
continue;
}
// Availability for a specific platform
if (!AvAttr->Introduced.hasValue() && !AvAttr->Deprecated.hasValue() &&
!AvAttr->Obsoleted.hasValue() &&
!AvAttr->isUnconditionallyDeprecated() &&
!AvAttr->isUnconditionallyUnavailable()) {
continue;
}
const char *plat;
switch (AvAttr->Platform) {
case PlatformKind::OSX:
plat = "macos";
break;
case PlatformKind::iOS:
plat = "ios";
break;
case PlatformKind::tvOS:
plat = "tvos";
break;
case PlatformKind::watchOS:
plat = "watchos";
break;
case PlatformKind::OSXApplicationExtension:
plat = "macos_app_extension";
break;
case PlatformKind::iOSApplicationExtension:
plat = "ios_app_extension";
break;
case PlatformKind::tvOSApplicationExtension:
plat = "tvos_app_extension";
break;
case PlatformKind::watchOSApplicationExtension:
plat = "watchos_app_extension";
break;
case PlatformKind::none:
llvm_unreachable("handled above");
}
maybePrintLeadingSpace();
os << "SWIFT_AVAILABILITY(" << plat;
if (AvAttr->isUnconditionallyUnavailable()) {
os << ",unavailable";
} else {
if (AvAttr->Introduced.hasValue()) {
os << ",introduced=" << AvAttr->Introduced.getValue().getAsString();
}
if (AvAttr->Deprecated.hasValue()) {
os << ",deprecated=" << AvAttr->Deprecated.getValue().getAsString();
} else if (AvAttr->isUnconditionallyDeprecated()) {
// We need to specify some version, we can't just say deprecated.
// We also can't deprecate it before it's introduced.
if (AvAttr->Introduced.hasValue()) {
os << ",deprecated=" << AvAttr->Introduced.getValue().getAsString();
} else {
os << ",deprecated=0.0.1";
}
}
if (AvAttr->Obsoleted.hasValue()) {
os << ",obsoleted=" << AvAttr->Obsoleted.getValue().getAsString();
}
}
if (!AvAttr->Rename.empty() && isa<ValueDecl>(D)) {
os << ",message=\"'" << cast<ValueDecl>(D)->getBaseName()
<< "' has been renamed to '";
printRenameForDecl(AvAttr, cast<ValueDecl>(D), false);
os << '\'';
if (!AvAttr->Message.empty()) {
os << ": ";
printEncodedString(AvAttr->Message, false);
}
os << "\"";
} else if (!AvAttr->Message.empty()) {
os << ",message=";
printEncodedString(AvAttr->Message);
}
os << ")";
}
return hasPrintedAnything;
}
const ValueDecl *getRenameDecl(const ValueDecl *D,
const ParsedDeclName renamedParsedDeclName) {
auto declContext = D->getDeclContext();
ASTContext &astContext = D->getASTContext();
auto renamedDeclName = renamedParsedDeclName.formDeclName(astContext);
if (isa<ClassDecl>(D) || isa<ProtocolDecl>(D)) {
if (!renamedParsedDeclName.ContextName.empty()) {
return nullptr;
}
UnqualifiedLookup lookup(renamedDeclName.getBaseIdentifier(),
declContext->getModuleScopeContext(), nullptr,
SourceLoc(),
UnqualifiedLookup::Flags::TypeLookup);
return lookup.getSingleTypeResult();
}
TypeDecl *typeDecl = declContext->getSelfNominalTypeDecl();
const ValueDecl *renamedDecl = nullptr;
SmallVector<ValueDecl *, 4> lookupResults;
declContext->lookupQualified(typeDecl->getDeclaredInterfaceType(),
renamedDeclName, NL_QualifiedDefault, nullptr,
lookupResults);
if (lookupResults.size() == 1) {
auto candidate = lookupResults[0];
if (!shouldInclude(candidate))
return nullptr;
if (candidate->getKind() != D->getKind() ||
(candidate->isInstanceMember() !=
cast<ValueDecl>(D)->isInstanceMember()))
return nullptr;
renamedDecl = candidate;
} else {
for (auto candidate : lookupResults) {
if (!shouldInclude(candidate))
continue;
if (candidate->getKind() != D->getKind() ||
(candidate->isInstanceMember() !=
cast<ValueDecl>(D)->isInstanceMember()))
continue;
if (isa<AbstractFunctionDecl>(candidate)) {
auto cParams = cast<AbstractFunctionDecl>(candidate)->getParameters();
auto dParams = cast<AbstractFunctionDecl>(D)->getParameters();
if (cParams->size() != dParams->size())
continue;
bool hasSameParameterTypes = true;
for (auto index : indices(*cParams)) {
auto cParamsType = cParams->get(index)->getType();
auto dParamsType = dParams->get(index)->getType();
if (!cParamsType->matchesParameter(dParamsType,
TypeMatchOptions())) {
hasSameParameterTypes = false;
break;
}
}
if (!hasSameParameterTypes) {
continue;