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DeclAndTypePrinter.cpp
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//===--- DeclAndTypePrinter.cpp - Emit ObjC decls from a Swift AST --------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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 "DeclAndTypePrinter.h"
#include "ClangSyntaxPrinter.h"
#include "PrimitiveTypeMapping.h"
#include "PrintClangClassType.h"
#include "PrintClangFunction.h"
#include "PrintClangValueType.h"
#include "SwiftToClangInteropContext.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTMangler.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ClangSwiftTypeCorrespondence.h"
#include "swift/AST/Comment.h"
#include "swift/AST/Decl.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/ForeignAsyncConvention.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/SwiftNameTranslation.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/TypeVisitor.h"
#include "swift/IDE/CommentConversion.h"
#include "swift/IRGen/IRABIDetailsProvider.h"
#include "swift/IRGen/Linking.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/Parser.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/SourceManager.h"
#include "SwiftToClangInteropContext.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;
}
return type->isAnyHashable();
}
static bool isAnyObjectOrAny(Type type) {
return type->isAnyObject() || type->isMarkerExistential();
}
// 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 return value of
// isImplicitlyUnwrappedOptional().
std::pair<Type, OptionalTypeKind>
DeclAndTypePrinter::getObjectTypeAndOptionality(const ValueDecl *D, Type ty) {
OptionalTypeKind kind;
if (auto objTy = ty->getReferenceStorageReferent()->getOptionalObjectType()) {
kind = OTK_Optional;
if (D->isImplicitlyUnwrappedOptional())
kind = OTK_ImplicitlyUnwrappedOptional;
return {objTy, kind};
}
return {ty, OTK_None};
}
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]));
}
// Enters and leaves a new lexical scope when emitting
// members of a Swift type.
struct CxxEmissionScopeRAII {
DeclAndTypePrinter &printer;
CxxDeclEmissionScope &prevScope;
CxxDeclEmissionScope scope;
CxxEmissionScopeRAII(DeclAndTypePrinter &printer)
: printer(printer), prevScope(printer.getCxxDeclEmissionScope()) {
printer.setCxxDeclEmissionScope(scope);
}
~CxxEmissionScopeRAII() { printer.setCxxDeclEmissionScope(prevScope); }
};
class DeclAndTypePrinter::Implementation
: private DeclVisitor<DeclAndTypePrinter::Implementation>,
private TypeVisitor<DeclAndTypePrinter::Implementation, void,
std::optional<OptionalTypeKind>>,
private ClangSyntaxPrinter {
using PrinterImpl = Implementation;
friend ASTVisitor;
friend TypeVisitor;
DeclAndTypePrinter &owningPrinter;
OutputLanguageMode outputLang;
SmallVector<const FunctionType *, 4> openFunctionTypes;
ASTContext &getASTContext() const {
return owningPrinter.M.getASTContext();
}
// Returns an implementation that prints to the module's prologue.
Implementation getModuleProloguePrinter() {
return Implementation(owningPrinter.prologueOS, owningPrinter, outputLang);
}
public:
explicit Implementation(raw_ostream &out, DeclAndTypePrinter &owner,
OutputLanguageMode outputLang)
: ClangSyntaxPrinter(out), owningPrinter(owner), outputLang(outputLang) {}
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 owningPrinter.shouldInclude(VD);
}
bool isEmptyExtensionDecl(const 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);
}
private:
void recordEmittedDeclInCurrentCxxLexicalScope(const ValueDecl *vd) {
assert(outputLang == OutputLanguageMode::Cxx);
owningPrinter.getCxxDeclEmissionScope().emittedDeclarationNames.insert(
cxx_translation::getNameForCxx(vd));
}
/// 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) {
CxxEmissionScopeRAII cxxScopeRAII(owningPrinter);
// FIXME: Actually track emitted members in nested
// lexical scopes.
// FIXME: Emit unavailable C++ decls for not emitted
// nested members.
bool protocolMembersOptional = false;
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 && owningPrinter.objcDelayedMembers.count(VD)) {
os << "// '" << VD->getName()
<< ((outputLang == OutputLanguageMode::Cxx) ? "' cannot be printed\n"
: "' below\n");
continue;
}
if (VD->getAttrs().hasAttribute<OptionalAttr>() !=
protocolMembersOptional) {
protocolMembersOptional = !protocolMembersOptional;
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(raw_ostream &os, 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 return value of
// isImplicitlyUnwrappedOptional().
static std::pair<Type, OptionalTypeKind>
getObjectTypeAndOptionality(const ValueDecl *D, Type ty) {
return DeclAndTypePrinter::getObjectTypeAndOptionality(D, ty);
}
// Ignore other declarations.
void visitDecl(Decl *D) {}
void visitClassDecl(ClassDecl *CD) {
printDocumentationComment(CD);
if (outputLang == OutputLanguageMode::Cxx) {
// FIXME: Non objc class.
// FIXME: forward decl should be handled by ModuleWriter.
ClangValueTypePrinter::forwardDeclType(os, CD, owningPrinter);
ClangClassTypePrinter(os).printClassTypeDecl(
CD, [&]() { printMembers(CD->getMembers()); }, owningPrinter);
recordEmittedDeclInCurrentCxxLexicalScope(CD);
return;
}
// 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 availability,
// we'll print a SWIFT_AVAILABLE() which implies __attribute__((weak_imported))
// already.
if (CD->getAttrs().hasAttribute<WeakLinkedAttr>())
os << "SWIFT_WEAK_IMPORT\n";
if (CD->getAttrs().hasAttribute<IBDesignableAttr>()) {
os << "IB_DESIGNABLE\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";
}
void visitStructDecl(StructDecl *SD) {
if (outputLang != OutputLanguageMode::Cxx)
return;
// FIXME: Print struct's doc comment.
ClangValueTypePrinter printer(os, owningPrinter.prologueOS,
owningPrinter.interopContext);
printer.printValueTypeDecl(
SD, /*bodyPrinter=*/
[&]() {
printMembers(SD->getMembers());
for (const auto *ed :
owningPrinter.interopContext.getExtensionsForNominalType(SD)) {
if (!cxx_translation::isExposableToCxx(ed->getGenericSignature()))
continue;
printMembers(ed->getMembers());
}
},
owningPrinter);
recordEmittedDeclInCurrentCxxLexicalScope(SD);
}
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";
printMembers(PD->getMembers());
os << "@end\n";
}
void visitEnumDeclCxx(EnumDecl *ED) {
assert(owningPrinter.outputLang == OutputLanguageMode::Cxx);
ClangValueTypePrinter valueTypePrinter(os, owningPrinter.prologueOS,
owningPrinter.interopContext);
ClangSyntaxPrinter syntaxPrinter(os);
DeclAndTypeClangFunctionPrinter clangFuncPrinter(
os, owningPrinter.prologueOS, owningPrinter.typeMapping,
owningPrinter.interopContext, owningPrinter);
auto &outOfLineOS = owningPrinter.outOfLineDefinitionsOS;
ClangSyntaxPrinter outOfLineSyntaxPrinter(outOfLineOS);
DeclAndTypeClangFunctionPrinter outOfLineFuncPrinter(
owningPrinter.outOfLineDefinitionsOS, owningPrinter.prologueOS,
owningPrinter.typeMapping, owningPrinter.interopContext, owningPrinter);
ClangValueTypePrinter outOfLineValTyPrinter(
owningPrinter.outOfLineDefinitionsOS, owningPrinter.prologueOS,
owningPrinter.interopContext);
auto elementTagMapping =
owningPrinter.interopContext.getIrABIDetails().getEnumTagMapping(ED);
// Sort cases based on their assigned tag indices
llvm::stable_sort(elementTagMapping, [](const auto &p1, const auto &p2) {
return p1.second.tag < p2.second.tag;
});
auto printIsFunction = [&](StringRef caseName, EnumDecl *ED) {
std::string declName, defName, name;
llvm::raw_string_ostream declOS(declName), defOS(defName), nameOS(name);
ClangSyntaxPrinter(nameOS).printIdentifier(caseName);
name[0] = std::toupper(name[0]);
os << " ";
ClangSyntaxPrinter(os).printInlineForThunk();
os << "bool is" << name << "() const;\n";
outOfLineSyntaxPrinter
.printNominalTypeOutsideMemberDeclTemplateSpecifiers(ED);
outOfLineOS << " ";
ClangSyntaxPrinter(outOfLineOS).printInlineForThunk();
outOfLineOS << " bool ";
outOfLineSyntaxPrinter.printNominalTypeQualifier(
ED, /*moduleContext=*/ED->getModuleContext());
outOfLineOS << "is" << name << "() const {\n";
outOfLineOS << " return *this == ";
outOfLineSyntaxPrinter.printNominalTypeQualifier(
ED, /*moduleContext=*/ED->getModuleContext());
outOfLineSyntaxPrinter.printIdentifier(caseName);
outOfLineOS << ";\n";
outOfLineOS << " }\n";
};
auto printGetFunction = [&](EnumElementDecl *elementDecl) {
auto associatedValueList = elementDecl->getParameterList();
// TODO: add tuple type support
if (!elementDecl->hasAssociatedValues() ||
associatedValueList->size() > 1) {
return;
}
auto paramType = associatedValueList->front()->getInterfaceType();
std::string declName, defName, name;
llvm::raw_string_ostream declOS(declName), defOS(defName), nameOS(name);
ClangSyntaxPrinter(nameOS).printIdentifier(elementDecl->getNameStr());
name[0] = std::toupper(name[0]);
clangFuncPrinter.printCustomCxxFunction(
{paramType},
/*NeedsReturnTypes=*/true,
[&](auto &types) {
// Printing function name and return type
os << " ";
ClangSyntaxPrinter(os).printInlineForThunk();
os << types[paramType] << " get" << name;
outOfLineSyntaxPrinter
.printNominalTypeOutsideMemberDeclTemplateSpecifiers(ED);
outOfLineOS << " ";
ClangSyntaxPrinter(outOfLineOS).printInlineForThunk();
outOfLineOS << types[paramType] << ' ';
outOfLineSyntaxPrinter.printNominalTypeQualifier(
ED, /*moduleContext=*/ED->getModuleContext());
outOfLineOS << "get" << name;
},
[&](auto &types) {}, true,
[&](auto &types) {
// Printing function body
outOfLineOS << " if (!is" << name << "()) abort();\n";
outOfLineOS << " alignas(";
outOfLineSyntaxPrinter.printBaseName(elementDecl->getParentEnum());
outOfLineOS << ") unsigned char buffer[sizeof(";
outOfLineSyntaxPrinter.printBaseName(elementDecl->getParentEnum());
outOfLineOS << ")];\n";
outOfLineOS << " auto *thisCopy = new(buffer) ";
outOfLineSyntaxPrinter.printBaseName(elementDecl->getParentEnum());
outOfLineOS << "(*this);\n";
outOfLineOS << " char * _Nonnull payloadFromDestruction = "
"thisCopy->_destructiveProjectEnumData();\n";
if (const auto *gtpt = paramType->getAs<GenericTypeParamType>()) {
DeclAndTypeClangFunctionPrinter::printGenericReturnSequence(
outOfLineOS, gtpt, [](StringRef) {},
/*initializeWithTake=*/StringRef("payloadFromDestruction"));
return;
}
// FIXME: unify non-generic return with regular function emission
// return path.
Type objectType;
OptionalTypeKind optKind;
std::tie(objectType, optKind) = getObjectTypeAndOptionality(
paramType->getNominalOrBoundGenericNominal(), paramType);
auto objectTypeDecl = objectType->getNominalOrBoundGenericNominal();
if (auto knownCxxType =
owningPrinter.typeMapping.getKnownCxxTypeInfo(
objectTypeDecl)) {
outOfLineOS << " " << types[paramType] << " result;\n";
outOfLineOS << " "
"memcpy(&result, payloadFromDestruction, "
"sizeof(result));\n";
outOfLineOS << " return result;\n ";
} else {
outOfLineOS << " return swift::";
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<";
outOfLineSyntaxPrinter.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
elementDecl->getParentEnum()->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ">::type";
if (isa<ClassDecl>(objectTypeDecl)) {
outOfLineOS << "::makeRetained(*reinterpret_cast<void "
"**>(payloadFromDestruction));\n ";
} else {
outOfLineOS << "::returnNewValue([&](char * _Nonnull result) "
"SWIFT_INLINE_THUNK_ATTRIBUTES {\n";
outOfLineOS << " swift::"
<< cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<";
outOfLineSyntaxPrinter.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
elementDecl->getParentEnum()->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ">::type";
outOfLineOS << "::initializeWithTake(result, "
"payloadFromDestruction);\n";
outOfLineOS << " });\n ";
}
}
},
ED, ED->getModuleContext(), outOfLineOS);
};
auto printStruct = [&](StringRef caseName, EnumElementDecl *elementDecl,
std::optional<IRABIDetailsProvider::EnumElementInfo>
elementInfo) {
os << " inline const static struct _impl_" << caseName << " { "
<< "// impl struct for case " << caseName << '\n';
os << " ";
syntaxPrinter.printInlineForThunk();
os << "constexpr operator cases() const {\n";
os << " return cases::";
syntaxPrinter.printIdentifier(caseName);
os << ";\n";
os << " }\n";
if (elementDecl != nullptr) {
assert(elementInfo.has_value());
Type paramType;
// TODO: support tuple type
if (elementDecl->hasAssociatedValues() &&
elementDecl->getParameterList()->size() == 1) {
paramType =
elementDecl->getParameterList()->front()->getInterfaceType();
}
SmallVector<Type> neededTypes;
if (paramType) {
neededTypes.push_back(paramType);
}
clangFuncPrinter.printCustomCxxFunction(
neededTypes,
/*NeedsReturnTypes=*/false,
[&](auto &types) {
const auto *ED = elementDecl->getParentEnum();
// Printing function name and return type
os << " SWIFT_INLINE_THUNK "; // TODO
syntaxPrinter.printNominalTypeReference(ED,
ED->getModuleContext());
os << " operator()";
outOfLineSyntaxPrinter
.printNominalTypeOutsideMemberDeclTemplateSpecifiers(ED);
outOfLineOS << " ";
outOfLineSyntaxPrinter.printInlineForThunk();
outOfLineSyntaxPrinter.printNominalTypeReference(
ED, ED->getModuleContext());
outOfLineOS << ' ';
outOfLineSyntaxPrinter.printNominalTypeQualifier(
ED, /*moduleContext=*/ED->getModuleContext());
outOfLineOS << "_impl_" << caseName << "::operator()";
},
[&](auto &types) {
// Printing parameters
if (!paramType) {
return;
}
os << types[paramType] << " val";
outOfLineOS << types[paramType] << " val";
},
true,
[&](auto &types) {
auto *ED = elementDecl->getParentEnum();
// Printing function body
outOfLineOS << " auto result = ";
outOfLineSyntaxPrinter.printNominalTypeQualifier(
ED, ED->getModuleContext());
outOfLineOS << "_make();\n";
if (paramType) {
if (paramType->getAs<GenericTypeParamType>()) {
auto type = types[paramType];
ClangSyntaxPrinter(outOfLineOS)
.printIgnoredCxx17ExtensionDiagnosticBlock([&]() {
// FIXME: handle C++ types.
outOfLineOS << "if constexpr (std::is_base_of<::swift::"
<< cxx_synthesis::getCxxImplNamespaceName()
<< "::RefCountedClass, " << type
<< ">::value) {\n";
outOfLineOS << " void *ptr = ::swift::"
<< cxx_synthesis::getCxxImplNamespaceName()
<< "::_impl_RefCountedClass::"
"copyOpaquePointer(val);\n";
outOfLineOS
<< " memcpy(result._getOpaquePointer(), &ptr, "
"sizeof(ptr));\n";
outOfLineOS << "} else if constexpr (::swift::"
<< cxx_synthesis::getCxxImplNamespaceName()
<< "::isValueType<" << type << ">) {\n";
outOfLineOS << " alignas(" << type;
outOfLineOS << ") unsigned char buffer[sizeof(" << type;
outOfLineOS << ")];\n";
outOfLineOS << " auto *valCopy = new(buffer) "
<< type;
outOfLineOS << "(val);\n";
outOfLineOS << " ";
outOfLineOS << cxx_synthesis::getCxxSwiftNamespaceName()
<< "::";
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<" << type;
outOfLineOS << ">::type::initializeWithTake(result._"
"getOpaquePointer(), ";
outOfLineOS << cxx_synthesis::getCxxSwiftNamespaceName()
<< "::";
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<" << type;
outOfLineOS << ">::type::getOpaquePointer(*valCopy)";
outOfLineOS << ");\n";
outOfLineOS << "} else {\n";
outOfLineOS
<< " memcpy(result._getOpaquePointer(), &val, "
"sizeof(val));\n";
outOfLineOS << "}\n";
});
} else {
OptionalTypeKind optKind;
Type objectType;
std::tie(objectType, optKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(
ED, paramType);
auto objectTypeDecl =
objectType->getNominalOrBoundGenericNominal();
assert(objectTypeDecl != nullptr);
if (owningPrinter.typeMapping.getKnownCxxTypeInfo(
objectTypeDecl)) {
outOfLineOS
<< " memcpy(result._getOpaquePointer(), &val, "
"sizeof(val));\n";
} else if (isa<ClassDecl>(objectTypeDecl)) {
outOfLineOS
<< " auto op = swift::"
<< cxx_synthesis::getCxxImplNamespaceName()
<< "::_impl_RefCountedClass::copyOpaquePointer(val);\n";
outOfLineOS << " memcpy(result._getOpaquePointer(), "
"&op, sizeof(op));\n";
} else {
objectTypeDecl =
paramType->getNominalOrBoundGenericNominal();
outOfLineOS << " alignas(";
outOfLineSyntaxPrinter
.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
ED->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ") unsigned char buffer[sizeof(";
outOfLineSyntaxPrinter
.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
ED->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ")];\n";
outOfLineOS << " auto *valCopy = new(buffer) ";
outOfLineSyntaxPrinter
.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
ED->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << "(val);\n";
outOfLineOS << " ";
outOfLineOS << cxx_synthesis::getCxxSwiftNamespaceName()
<< "::";
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<";
outOfLineSyntaxPrinter
.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
ED->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ">::type::initializeWithTake(result._"
"getOpaquePointer(), ";
outOfLineOS << cxx_synthesis::getCxxSwiftNamespaceName()
<< "::";
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName();
outOfLineOS << "::implClassFor<";
outOfLineSyntaxPrinter
.printModuleNamespaceQualifiersIfNeeded(
objectTypeDecl->getModuleContext(),
ED->getModuleContext());
outOfLineSyntaxPrinter.printBaseName(objectTypeDecl);
outOfLineOS << ">::type::getOpaquePointer(*valCopy)";
outOfLineOS << ");\n";
}
}
}
outOfLineOS << " result._destructiveInjectEnumTag(";
if (ED->isResilient()) {
outOfLineOS << cxx_synthesis::getCxxImplNamespaceName()
<< "::" << elementInfo->globalVariableName;
} else {
outOfLineOS << elementInfo->tag;
}
outOfLineOS << ");\n";
outOfLineOS << " return result;\n";
outOfLineOS << " ";
},
ED, ED->getModuleContext(), outOfLineOS);
}
os << " } ";
syntaxPrinter.printIdentifier(caseName);
if (elementDecl)
syntaxPrinter.printSymbolUSRAttribute(elementDecl);
os << ";\n";
};
valueTypePrinter.printValueTypeDecl(
ED, /*bodyPrinter=*/
[&]() {
os << '\n';
os << " enum class cases {";
llvm::interleave(
elementTagMapping, os,
[&](const auto &pair) {
os << "\n ";
syntaxPrinter.printIdentifier(pair.first->getNameStr());
syntaxPrinter.printSymbolUSRAttribute(pair.first);
},
",");
// TODO: allow custom name for this special case
auto resilientUnknownDefaultCaseName = "unknownDefault";
if (ED->isResilient()) {
os << (ED->getNumElements() > 0 ? ",\n " : "\n ")
<< resilientUnknownDefaultCaseName;
}
os << "\n };\n\n"; // enum class cases' closing bracket
os << "#pragma clang diagnostic push\n";
os << "#pragma clang diagnostic ignored \"-Wc++17-extensions\" "
<< "// allow use of inline static data member\n";
for (const auto &pair : elementTagMapping) {
// Printing struct
printStruct(pair.first->getNameStr(), pair.first, pair.second);
// Printing `is` function
printIsFunction(pair.first->getNameStr(), ED);
if (pair.first->hasAssociatedValues()) {
// Printing `get` function
printGetFunction(pair.first);
}
os << '\n';
}
if (ED->isResilient()) {
// Printing struct for unknownDefault
printStruct(resilientUnknownDefaultCaseName,
/* elementDecl */ nullptr,
/* elementInfo */ std::nullopt);
// Printing isUnknownDefault
printIsFunction(resilientUnknownDefaultCaseName, ED);
os << '\n';
}
os << "#pragma clang diagnostic pop\n";
// Printing operator cases()
os << " ";
ClangSyntaxPrinter(os).printInlineForThunk();
os << "operator cases() const {\n";
if (ED->isResilient()) {
if (!elementTagMapping.empty()) {
os << " auto tag = _getEnumTag();\n";
}
for (const auto &pair : elementTagMapping) {
os << " if (tag == "
<< cxx_synthesis::getCxxImplNamespaceName();
os << "::" << pair.second.globalVariableName
<< ") return cases::";
syntaxPrinter.printIdentifier(pair.first->getNameStr());
os << ";\n";
}
os << " return cases::" << resilientUnknownDefaultCaseName
<< ";\n";
} else { // non-resilient enum
os << " switch (_getEnumTag()) {\n";
for (const auto &pair : elementTagMapping) {
os << " case " << pair.second.tag << ": return cases::";
syntaxPrinter.printIdentifier(pair.first->getNameStr());
os << ";\n";
}
// TODO: change to Swift's fatalError when it's available in C++
os << " default: abort();\n";
os << " }\n"; // switch's closing bracket
}
os << " }\n"; // operator cases()'s closing bracket
os << "\n";
printMembers(ED->getMembers());
for (const auto *ext :
owningPrinter.interopContext.getExtensionsForNominalType(ED)) {
if (!cxx_translation::isExposableToCxx(ext->getGenericSignature()))
continue;
printMembers(ext->getMembers());
}
},
owningPrinter);
recordEmittedDeclInCurrentCxxLexicalScope(ED);
}
void visitEnumDecl(EnumDecl *ED) {
printDocumentationComment(ED);
if (outputLang == OutputLanguageMode::Cxx) {
visitEnumDeclCxx(ED);
return;
}
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->getBaseIdentifier() << "\")";
}
// Print the raw values, even the ones that we synthesize.
auto *ILE = cast<IntegerLiteralExpr>(Elt->getStructuralRawValueExpr());
os << " = ";
if (ILE->isNegative())
os << "-";
os << ILE->getDigitsText();
os << ",\n";
}
os << "};\n";
}
void printSingleMethodParam(StringRef selectorPiece,
const ParamDecl *param,
const clang::ParmVarDecl *clangParam,
bool forceNSUInteger) {
os << selectorPiece << ":(";
if (forceNSUInteger ||
(clangParam && isNSUInteger(clangParam->getType()))) {
os << "NSUInteger";
} else {
OptionalTypeKind kind;
Type objTy;
std::tie(objTy, kind) =
getObjectTypeAndOptionality(param, param->getInterfaceType());
print(objTy, kind, "", 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) {
if (const auto* elaboratedTy = dyn_cast<clang::ElaboratedType>(clangTy)) {
clangTy = elaboratedTy->desugar();
}
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, AnyFunctionType *methodTy,
std::optional<ForeignAsyncConvention> asyncConvention,
std::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: