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PrintClangFunction.cpp
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//===--- PrintClangFunction.cpp - Printer for C/C++ functions ---*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2022 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 "PrintClangFunction.h"
#include "ClangSyntaxPrinter.h"
#include "DeclAndTypePrinter.h"
#include "OutputLanguageMode.h"
#include "PrimitiveTypeMapping.h"
#include "PrintClangClassType.h"
#include "PrintClangValueType.h"
#include "SwiftToClangInteropContext.h"
#include "swift/ABI/MetadataValues.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Decl.h"
#include "swift/AST/GenericParamList.h"
#include "swift/AST/Module.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/SwiftNameTranslation.h"
#include "swift/AST/Type.h"
#include "swift/AST/TypeVisitor.h"
#include "swift/AST/Types.h"
#include "swift/Basic/Assertions.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/IRGen/IRABIDetailsProvider.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "llvm/ADT/STLExtras.h"
using namespace swift;
namespace {
// FIXME: RENAME.
enum class FunctionSignatureTypeUse { TypeReference, ParamType, ReturnType };
std::optional<PrimitiveTypeMapping::ClangTypeInfo>
getKnownTypeInfo(const TypeDecl *typeDecl, PrimitiveTypeMapping &typeMapping,
OutputLanguageMode languageMode) {
return languageMode == OutputLanguageMode::Cxx
? typeMapping.getKnownCxxTypeInfo(typeDecl)
: typeMapping.getKnownCTypeInfo(typeDecl);
}
bool isKnownType(Type t, PrimitiveTypeMapping &typeMapping,
OutputLanguageMode languageMode) {
if (auto *typeAliasType = dyn_cast<TypeAliasType>(t.getPointer())) {
auto aliasInfo =
getKnownTypeInfo(typeAliasType->getDecl(), typeMapping, languageMode);
if (aliasInfo != std::nullopt)
return true;
return isKnownType(typeAliasType->getSinglyDesugaredType(), typeMapping,
languageMode);
}
const TypeDecl *typeDecl;
auto *tPtr = t->isOptional() ? t->getOptionalObjectType()->getDesugaredType()
: t->getDesugaredType();
if (auto *bgt = dyn_cast<BoundGenericStructType>(tPtr)) {
return bgt->isUnsafePointer() || bgt->isUnsafeMutablePointer();
}
if (auto *structType = dyn_cast<StructType>(tPtr)) {
auto nullableInfo =
getKnownTypeInfo(structType->getDecl(), typeMapping, languageMode);
if (nullableInfo && nullableInfo->canBeNullable)
return true;
}
if (auto *classType = dyn_cast<ClassType>(tPtr)) {
return classType->getClassOrBoundGenericClass()->hasClangNode() &&
isa<clang::ObjCInterfaceDecl>(
classType->getClassOrBoundGenericClass()->getClangDecl());
}
if (auto *structDecl = t->getStructOrBoundGenericStruct())
typeDecl = structDecl;
else
return false;
return getKnownTypeInfo(typeDecl, typeMapping, languageMode) != std::nullopt;
}
bool isKnownCxxType(Type t, PrimitiveTypeMapping &typeMapping) {
return isKnownType(t, typeMapping, OutputLanguageMode::Cxx);
}
bool isKnownCType(Type t, PrimitiveTypeMapping &typeMapping) {
return isKnownType(t, typeMapping, OutputLanguageMode::ObjC);
}
struct CFunctionSignatureTypePrinterModifierDelegate {
/// Prefix the initially printed value type.
std::optional<llvm::function_ref<ClangValueTypePrinter::TypeUseKind(
ClangValueTypePrinter::TypeUseKind)>>
mapValueTypeUseKind = std::nullopt;
};
class ClangTypeHandler {
public:
ClangTypeHandler(const clang::Decl *typeDecl)
: typeDecl(dyn_cast<clang::TagDecl>(typeDecl)) {}
bool isRepresentable() const {
// We can only return tag types.
if (typeDecl) {
// We can return trivial types.
if (isTrivial(typeDecl))
return true;
// We can return nontrivial types iff they can be moved or copied.
if (auto *record = dyn_cast<clang::CXXRecordDecl>(typeDecl)) {
return record->hasMoveConstructor() ||
record->hasCopyConstructorWithConstParam();
}
}
// Otherwise, we can't return this type.
return false;
}
private:
/// Is the tag type trivial?
static bool isTrivial(const clang::TagDecl *typeDecl) {
if (!typeDecl)
return false;
if (auto *record = dyn_cast<clang::CXXRecordDecl>(typeDecl))
return record->isTrivial();
// Structs with ARC members are not considered trivial.
if (auto *record = dyn_cast<clang::RecordDecl>(typeDecl))
return !record->hasObjectMember();
// C-family enums are always trivial.
return isa<clang::EnumDecl>(typeDecl);
}
public:
void printTypeName(const ASTContext &Context, raw_ostream &os) const {
ClangSyntaxPrinter(Context, os).printClangTypeReference(typeDecl);
}
static void
printGenericReturnScaffold(raw_ostream &os, StringRef templateParamName,
llvm::function_ref<void(StringRef)> bodyOfReturn) {
printReturnScaffold(nullptr, os, templateParamName, templateParamName,
bodyOfReturn);
}
void printReturnScaffold(const ASTContext &Context, raw_ostream &os,
llvm::function_ref<void(StringRef)> bodyOfReturn) {
std::string fullQualifiedType;
std::string typeName;
{
llvm::raw_string_ostream typeNameOS(fullQualifiedType);
printTypeName(Context, typeNameOS);
llvm::raw_string_ostream unqualTypeNameOS(typeName);
unqualTypeNameOS << typeDecl->getName();
}
printReturnScaffold(typeDecl, os, fullQualifiedType, typeName,
bodyOfReturn);
}
private:
static void
printReturnScaffold(const clang::TagDecl *typeDecl, raw_ostream &os,
StringRef fullQualifiedType, StringRef typeName,
llvm::function_ref<void(StringRef)> bodyOfReturn) {
os << "alignas(alignof(" << fullQualifiedType << ")) char storage[sizeof("
<< fullQualifiedType << ")];\n";
os << "auto * _Nonnull storageObjectPtr = reinterpret_cast<"
<< fullQualifiedType << " *>(storage);\n";
bodyOfReturn("storage");
os << ";\n";
if (isTrivial(typeDecl)) {
// Trivial object can be just copied and not destroyed.
os << "return *storageObjectPtr;\n";
return;
}
// Force a `std::move` on the resulting object.
os << fullQualifiedType << " result(static_cast<" << fullQualifiedType
<< " &&>(*storageObjectPtr));\n";
os << "storageObjectPtr->~" << typeName << "();\n";
os << "return result;\n";
}
const clang::TagDecl *typeDecl;
};
// Prints types in the C function signature that corresponds to the
// native Swift function/method.
class CFunctionSignatureTypePrinter
: public TypeVisitor<CFunctionSignatureTypePrinter, ClangRepresentation,
std::optional<OptionalTypeKind>, bool>,
private ClangSyntaxPrinter {
public:
CFunctionSignatureTypePrinter(
raw_ostream &os, raw_ostream &cPrologueOS,
PrimitiveTypeMapping &typeMapping, OutputLanguageMode languageMode,
SwiftToClangInteropContext &interopContext,
CFunctionSignatureTypePrinterModifierDelegate modifiersDelegate,
const ModuleDecl *moduleContext, DeclAndTypePrinter &declPrinter,
FunctionSignatureTypeUse typeUseKind =
FunctionSignatureTypeUse::ParamType)
: ClangSyntaxPrinter(moduleContext->getASTContext(), os), cPrologueOS(cPrologueOS),
typeMapping(typeMapping), interopContext(interopContext),
languageMode(languageMode), modifiersDelegate(modifiersDelegate),
moduleContext(moduleContext), declPrinter(declPrinter),
typeUseKind(typeUseKind) {}
void printInoutTypeModifier() {
os << (languageMode == swift::OutputLanguageMode::Cxx ? " &"
: " * _Nonnull");
}
bool printIfKnownSimpleType(const TypeDecl *typeDecl,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
auto knownTypeInfo = getKnownTypeInfo(typeDecl, typeMapping, languageMode);
if (!knownTypeInfo)
return false;
bool shouldPrintOptional = optionalKind && *optionalKind != OTK_None &&
!knownTypeInfo->canBeNullable;
if (!isInOutParam && shouldPrintOptional &&
typeUseKind == FunctionSignatureTypeUse::ParamType)
os << "const ";
printOptional(shouldPrintOptional ? optionalKind : std::nullopt, [&]() {
os << knownTypeInfo->name;
if (knownTypeInfo->canBeNullable) {
printNullability(optionalKind);
}
});
if (!isInOutParam && shouldPrintOptional &&
typeUseKind == FunctionSignatureTypeUse::ParamType)
os << '&';
if (isInOutParam)
printInoutTypeModifier();
return true;
}
void printOptional(std::optional<OptionalTypeKind> optionalKind,
llvm::function_ref<void()> body) {
if (!optionalKind || optionalKind == OTK_None)
return body();
printBaseName(moduleContext->getASTContext().getStdlibModule());
os << "::Optional<";
body();
os << '>';
}
ClangRepresentation visitType(TypeBase *Ty,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
assert(Ty->getDesugaredType() == Ty && "unhandled sugared type");
os << "/* ";
Ty->print(os);
os << " */";
return ClangRepresentation::unsupported;
}
ClangRepresentation
visitExistentialType(ExistentialType *ty,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
if (ty->isObjCExistentialType()) {
declPrinter.withOutputStream(os).print(ty, optionalKind);
if (isInOutParam) {
os << " __strong";
printInoutTypeModifier();
}
return ClangRepresentation::objcxxonly;
}
return visitPart(ty->getConstraintType(), optionalKind, isInOutParam);
}
ClangRepresentation
visitTupleType(TupleType *TT, std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
if (TT->getNumElements() > 0)
// FIXME: Handle non-void type.
return ClangRepresentation::unsupported;
// FIXME: how to support `()` parameters.
if (typeUseKind != FunctionSignatureTypeUse::ReturnType)
return ClangRepresentation::unsupported;
os << "void";
return ClangRepresentation::representable;
}
ClangRepresentation
visitTypeAliasType(TypeAliasType *aliasTy,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
const TypeAliasDecl *alias = aliasTy->getDecl();
if (printIfKnownSimpleType(alias, optionalKind, isInOutParam))
return ClangRepresentation::representable;
return visitSugarType(aliasTy, optionalKind, isInOutParam);
}
ClangRepresentation
visitSugarType(SugarType *sugarTy,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return visitPart(sugarTy->getSinglyDesugaredType(), optionalKind,
isInOutParam);
}
ClangRepresentation
visitClassType(ClassType *CT, std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
auto *cd = CT->getDecl();
if (cd->hasClangNode()) {
const auto *clangDecl = cd->getClangDecl();
ClangSyntaxPrinter(cd->getASTContext(), os).printClangTypeReference(clangDecl);
bool alreadyPointer = false;
if (const auto *typedefDecl = dyn_cast<clang::TypedefNameDecl>(clangDecl))
if (importer::isCFTypeDecl(typedefDecl))
alreadyPointer = true;
os << (alreadyPointer ? " " : " *")
<< (!optionalKind || *optionalKind == OTK_None ? "_Nonnull"
: "_Nullable");
if (isInOutParam) {
if (isa<clang::ObjCContainerDecl>(cd->getClangDecl()))
os << " __strong";
printInoutTypeModifier();
}
// FIXME: Mark that this is only ObjC representable.
return ClangRepresentation::representable;
}
// FIXME: handle optionalKind.
if (languageMode != OutputLanguageMode::Cxx) {
os << "void * "
<< (!optionalKind || *optionalKind == OTK_None ? "_Nonnull"
: "_Nullable");
if (isInOutParam)
os << " * _Nonnull";
return ClangRepresentation::representable;
}
if (typeUseKind == FunctionSignatureTypeUse::ParamType && !isInOutParam)
os << "const ";
printOptional(optionalKind, [&]() {
ClangSyntaxPrinter(CT->getASTContext(), os)
.printPrimaryCxxTypeName(cd, moduleContext);
});
if (typeUseKind == FunctionSignatureTypeUse::ParamType)
os << "&";
return ClangRepresentation::representable;
}
ClangRepresentation
visitEnumType(EnumType *ET, std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return visitValueType(ET, ET->getNominalOrBoundGenericNominal(),
optionalKind, isInOutParam);
}
ClangRepresentation
visitStructType(StructType *ST, std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return visitValueType(ST, ST->getNominalOrBoundGenericNominal(),
optionalKind, isInOutParam);
}
ClangRepresentation visitGenericArgs(ArrayRef<Type> genericArgs) {
if (genericArgs.empty())
return ClangRepresentation::representable;
os << '<';
llvm::SaveAndRestore<FunctionSignatureTypeUse> typeUseNormal(
typeUseKind, FunctionSignatureTypeUse::TypeReference);
decltype(modifiersDelegate) emptyModifiersDelegate;
llvm::SaveAndRestore<decltype(modifiersDelegate)> modReset(
modifiersDelegate, emptyModifiersDelegate);
ClangRepresentation result = ClangRepresentation::representable;
llvm::interleaveComma(genericArgs, os, [&](Type t) {
result.merge(visitPart(t, std::nullopt, false));
});
os << '>';
return result;
}
ClangRepresentation
visitValueType(TypeBase *type, const NominalTypeDecl *decl,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam, ArrayRef<Type> genericArgs = {}) {
assert(isa<StructDecl>(decl) || isa<EnumDecl>(decl));
// Handle known type names.
if (printIfKnownSimpleType(decl, optionalKind, isInOutParam))
return ClangRepresentation::representable;
if (!declPrinter.shouldInclude(decl))
return ClangRepresentation::unsupported; // FIXME: propagate why it's not
// exposed.
// Only C++ mode supports struct types.
if (languageMode != OutputLanguageMode::Cxx)
return ClangRepresentation::unsupported;
if (decl->hasClangNode()) {
assert(genericArgs.empty() && "this path doesn't support generic args");
ClangTypeHandler handler(decl->getClangDecl());
if (!handler.isRepresentable())
return ClangRepresentation::unsupported;
if (typeUseKind == FunctionSignatureTypeUse::ParamType &&
!isInOutParam)
os << "const ";
printOptional(optionalKind, [&]() { handler.printTypeName(decl->getASTContext(), os); });
if (typeUseKind == FunctionSignatureTypeUse::ParamType)
os << '&';
return ClangRepresentation::representable;
}
if (typeUseKind == FunctionSignatureTypeUse::ParamType) {
if (!isInOutParam) {
os << "const ";
}
ClangRepresentation result = ClangRepresentation::representable;
printOptional(optionalKind, [&]() {
ClangSyntaxPrinter(decl->getASTContext(), os).printPrimaryCxxTypeName(decl, moduleContext);
result = visitGenericArgs(genericArgs);
});
os << '&';
return result;
}
ClangRepresentation result = ClangRepresentation::representable;
printOptional(optionalKind, [&]() {
ClangValueTypePrinter printer(os, cPrologueOS, interopContext);
printer.printValueTypeReturnType(
decl, languageMode,
modifiersDelegate.mapValueTypeUseKind
? (*modifiersDelegate.mapValueTypeUseKind)(
ClangValueTypePrinter::TypeUseKind::CxxTypeName)
: ClangValueTypePrinter::TypeUseKind::CxxTypeName,
moduleContext);
result = visitGenericArgs(genericArgs);
});
return result;
}
std::optional<ClangRepresentation>
printIfKnownGenericStruct(const BoundGenericStructType *BGT,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
auto bgsTy = Type(const_cast<BoundGenericStructType *>(BGT));
bool isConst;
if (bgsTy->isUnsafePointer())
isConst = true;
else if (bgsTy->isUnsafeMutablePointer())
isConst = false;
else
return std::nullopt;
auto args = BGT->getGenericArgs();
assert(args.size() == 1);
llvm::SaveAndRestore<FunctionSignatureTypeUse> typeUseNormal(
typeUseKind, FunctionSignatureTypeUse::TypeReference);
// FIXME: We can definitely support pointers to known Clang types.
if (!isKnownCType(args.front(), typeMapping))
return ClangRepresentation(ClangRepresentation::unsupported);
auto partRepr = visitPart(args.front(), OTK_None, /*isInOutParam=*/false);
if (partRepr.isUnsupported())
return partRepr;
if (isConst)
os << " const";
os << " *";
printNullability(optionalKind);
if (isInOutParam)
printInoutTypeModifier();
return ClangRepresentation(ClangRepresentation::representable);
}
ClangRepresentation
visitBoundGenericStructType(BoundGenericStructType *BGT,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
if (auto result =
printIfKnownGenericStruct(BGT, optionalKind, isInOutParam))
return *result;
return visitValueType(BGT, BGT->getDecl(), optionalKind, isInOutParam,
BGT->getGenericArgs());
}
ClangRepresentation
visitBoundGenericEnumType(BoundGenericEnumType *BGT,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return visitValueType(BGT, BGT->getDecl(), optionalKind, isInOutParam,
BGT->getGenericArgs());
}
ClangRepresentation
visitGenericTypeParamType(GenericTypeParamType *genericTpt,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
bool isParam = typeUseKind == FunctionSignatureTypeUse::ParamType;
if (isParam && !isInOutParam)
os << "const ";
if (languageMode != OutputLanguageMode::Cxx) {
// Note: This can happen for UnsafeMutablePointer<T>.
if (typeUseKind != FunctionSignatureTypeUse::ParamType)
return ClangRepresentation::unsupported;
assert(typeUseKind == FunctionSignatureTypeUse::ParamType);
// Pass an opaque param in C mode.
os << "void * _Nonnull";
return ClangRepresentation::representable;
}
printOptional(optionalKind, [&]() {
ClangSyntaxPrinter(genericTpt->getASTContext(), os).printGenericTypeParamTypeName(genericTpt);
});
// Pass a reference to the template type.
if (isParam)
os << '&';
return ClangRepresentation::representable;
}
ClangRepresentation
visitDynamicSelfType(DynamicSelfType *ds,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return visitPart(ds->getSelfType(), optionalKind, isInOutParam);
}
ClangRepresentation
visitMetatypeType(MetatypeType *mt,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
if (typeUseKind == FunctionSignatureTypeUse::TypeReference)
return visitPart(mt->getInstanceType(), optionalKind, isInOutParam);
return ClangRepresentation::unsupported;
}
ClangRepresentation visitPart(Type Ty,
std::optional<OptionalTypeKind> optionalKind,
bool isInOutParam) {
return TypeVisitor::visit(Ty, optionalKind, isInOutParam);
}
private:
raw_ostream &cPrologueOS;
PrimitiveTypeMapping &typeMapping;
SwiftToClangInteropContext &interopContext;
OutputLanguageMode languageMode;
CFunctionSignatureTypePrinterModifierDelegate modifiersDelegate;
const ModuleDecl *moduleContext;
DeclAndTypePrinter &declPrinter;
FunctionSignatureTypeUse typeUseKind;
};
} // end namespace
ClangRepresentation
DeclAndTypeClangFunctionPrinter::printClangFunctionReturnType(
raw_ostream &stream, Type ty, OptionalTypeKind optKind,
ModuleDecl *moduleContext, OutputLanguageMode outputLang) {
CFunctionSignatureTypePrinter typePrinter(
stream, cPrologueOS, typeMapping, outputLang, interopContext,
CFunctionSignatureTypePrinterModifierDelegate(), moduleContext,
declPrinter, FunctionSignatureTypeUse::ReturnType);
// Param for indirect return cannot be marked as inout
return typePrinter.visit(ty, optKind, /*isInOutParam=*/false);
}
static void addABIRecordToTypeEncoding(llvm::raw_ostream &typeEncodingOS,
clang::CharUnits offset,
clang::CharUnits end, Type t,
PrimitiveTypeMapping &typeMapping) {
auto info =
typeMapping.getKnownCTypeInfo(t->getNominalOrBoundGenericNominal());
assert(info);
typeEncodingOS << '_';
for (char c : info->name) {
if (c == ' ')
typeEncodingOS << '_';
else if (c == '*')
typeEncodingOS << "ptr";
else
typeEncodingOS << c;
}
// Express the offset and end in terms of target word size.
// This ensures that tests are able to use the stub struct name in target
// independent manner.
auto emitUnit = [&](const clang::CharUnits &unit) {
typeEncodingOS << '_' << unit.getQuantity();
};
emitUnit(offset);
emitUnit(end);
}
template <class T>
static std::string encodeTypeInfo(const T &abiTypeInfo,
const ModuleDecl *moduleContext,
PrimitiveTypeMapping &typeMapping) {
std::string typeEncoding;
llvm::raw_string_ostream typeEncodingOS(typeEncoding);
ClangSyntaxPrinter(moduleContext->getASTContext(), typeEncodingOS).printBaseName(moduleContext);
abiTypeInfo.enumerateRecordMembers(
[&](clang::CharUnits offset, clang::CharUnits end, Type t) {
addABIRecordToTypeEncoding(typeEncodingOS, offset, end, t, typeMapping);
});
return std::move(typeEncodingOS.str());
}
static bool isOptionalObjCExistential(Type ty) {
if (auto obj = ty->getOptionalObjectType()) {
if (obj->isObjCExistentialType())
return true;
}
return false;
}
// Returns false if the given direct type is not yet supported because
// of its ABI.
template <class T>
static bool printDirectReturnOrParamCType(
const T &abiTypeInfo, Type valueType, const ModuleDecl *emittedModule,
raw_ostream &os, raw_ostream &cPrologueOS,
PrimitiveTypeMapping &typeMapping,
SwiftToClangInteropContext &interopContext,
llvm::function_ref<void()> prettifiedValuePrinter) {
const bool isResultType =
std::is_same<T, LoweredFunctionSignature::DirectResultType>::value;
StringRef stubTypeName =
isResultType ? "swift_interop_returnStub_" : "swift_interop_passStub_";
std::string typeEncoding;
llvm::raw_string_ostream typeEncodingOS(typeEncoding);
typeEncodingOS << stubTypeName;
ClangSyntaxPrinter(emittedModule->getASTContext(), typeEncodingOS).printBaseName(emittedModule);
unsigned Count = 0;
clang::CharUnits lastOffset;
if (abiTypeInfo.enumerateRecordMembers([&](clang::CharUnits offset,
clang::CharUnits end, Type t) {
lastOffset = offset;
++Count;
addABIRecordToTypeEncoding(typeEncodingOS, offset, end, t, typeMapping);
}))
return false;
if (isResultType && Count == 0) {
// A direct result with no record members can happen for uninhabited result
// types like `Never`.
os << "void";
return true;
}
assert(Count > 0 && "missing return values");
// FIXME: is this "prettyfying" logic sound for multiple return values?
if (isKnownCType(valueType, typeMapping) ||
(Count == 1 && lastOffset.isZero() && !valueType->hasTypeParameter() &&
(valueType->isAnyClassReferenceType() ||
isOptionalObjCExistential(valueType)))) {
prettifiedValuePrinter();
return true;
}
os << "struct " << typeEncodingOS.str();
llvm::SmallVector<std::pair<clang::CharUnits, clang::CharUnits>, 8> fields;
auto printStub = [&](raw_ostream &os, StringRef stubName) {
// Print out a C stub for this value type.
os << "// Stub struct to be used to pass/return values to/from Swift "
"functions.\n";
os << "struct " << stubName << " {\n";
abiTypeInfo.enumerateRecordMembers([&](clang::CharUnits offset,
clang::CharUnits end, Type t) {
auto info =
typeMapping.getKnownCTypeInfo(t->getNominalOrBoundGenericNominal());
os << " " << info->name;
if (info->canBeNullable)
os << " _Nullable";
os << " _" << (fields.size() + 1) << ";\n";
fields.push_back(std::make_pair(offset, end));
});
os << "};\n\n";
auto minimalStubName = stubName;
minimalStubName.consume_front(stubTypeName);
if (isResultType) {
// Emit a stub that returns a value directly from swiftcc function.
os << "static SWIFT_C_INLINE_THUNK void swift_interop_returnDirect_"
<< minimalStubName;
os << "(char * _Nonnull result, struct " << stubName << " value";
os << ") {\n";
for (size_t i = 0; i < fields.size(); ++i) {
os << " memcpy(result + " << fields[i].first.getQuantity() << ", "
<< "&value._" << (i + 1) << ", "
<< (fields[i].second - fields[i].first).getQuantity() << ");\n";
}
} else {
// Emit a stub that is used to pass value type directly to swiftcc
// function.
os << "static SWIFT_C_INLINE_THUNK struct " << stubName
<< " swift_interop_passDirect_" << minimalStubName;
os << "(const char * _Nonnull value) {\n";
os << " struct " << stubName << " result;\n";
for (size_t i = 0; i < fields.size(); ++i) {
os << " memcpy(&result._" << (i + 1) << ", value + "
<< fields[i].first.getQuantity() << ", "
<< (fields[i].second - fields[i].first).getQuantity() << ");\n";
}
os << " return result;\n";
}
os << "}\n\n";
};
interopContext.runIfStubForDeclNotEmitted(typeEncodingOS.str(), [&]() {
printStub(cPrologueOS, typeEncodingOS.str());
});
return true;
}
/// Make adjustments to the Swift parameter name in generated C++, to
/// avoid things like additional warnings.
static void renameCxxParameterIfNeeded(const AbstractFunctionDecl *FD,
std::string ¶mName) {
if (paramName.empty())
return;
const auto *enumDecl = FD->getDeclContext()->getSelfEnumDecl();
if (!enumDecl)
return;
// Rename a parameter in an enum method that shadows an existing case name,
// to avoid a -Wshadow warning in Clang.
for (const auto *Case : enumDecl->getAllElements()) {
if (Case->getNameStr() == paramName) {
paramName = (llvm::Twine(paramName) + "_").str();
return;
}
}
}
ClangRepresentation DeclAndTypeClangFunctionPrinter::printFunctionSignature(
const AbstractFunctionDecl *FD, const LoweredFunctionSignature &signature,
StringRef name, Type resultTy, FunctionSignatureKind kind,
FunctionSignatureModifiers modifiers) {
std::string functionSignature;
llvm::raw_string_ostream functionSignatureOS(functionSignature);
// Print any template and requires clauses for the
// C++ class context to which this C++ member will belong to.
if (const auto *typeDecl = modifiers.qualifierContext) {
assert(kind == FunctionSignatureKind::CxxInlineThunk);
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS)
.printNominalTypeOutsideMemberDeclTemplateSpecifiers(typeDecl);
}
if (FD->isGeneric()) {
auto Signature = FD->getGenericSignature().getCanonicalSignature();
if (!cxx_translation::isExposableToCxx(Signature))
return ClangRepresentation::unsupported;
// Print the template and requires clauses for this function.
if (kind == FunctionSignatureKind::CxxInlineThunk)
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS).printGenericSignature(Signature);
}
if (const auto *enumDecl = FD->getDeclContext()->getSelfEnumDecl()) {
// We cannot emit functions with the same name as an enum case yet, the resulting header
// does not compiler.
// FIXME: either do not emit cases as inline members, or rename the cases or the
// colliding functions.
for (const auto *enumElement : enumDecl->getAllElements()) {
auto elementName = enumElement->getName();
if (!elementName.isSpecial() && elementName.getBaseIdentifier().is(name))
return ClangRepresentation::unsupported;
}
}
auto emittedModule = FD->getModuleContext();
OutputLanguageMode outputLang = kind == FunctionSignatureKind::CFunctionProto
? OutputLanguageMode::ObjC
: OutputLanguageMode::Cxx;
// FIXME: Might need a PrintMultiPartType here.
auto print =
[&, this](Type ty, std::optional<OptionalTypeKind> optionalKind,
StringRef name, bool isInOutParam,
CFunctionSignatureTypePrinterModifierDelegate delegate = {})
-> ClangRepresentation {
// FIXME: add support for noescape and PrintMultiPartType,
// see DeclAndTypePrinter::print.
CFunctionSignatureTypePrinter typePrinter(
functionSignatureOS, cPrologueOS, typeMapping, outputLang,
interopContext, delegate, emittedModule, declPrinter);
auto result = typePrinter.visit(ty, optionalKind, isInOutParam);
if (!name.empty()) {
functionSignatureOS << ' ';
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS).printIdentifier(name);
}
return result;
};
// Print any modifiers before the signature.
if (modifiers.isStatic) {
assert(!modifiers.isConst);
functionSignatureOS << "static ";
}
if (modifiers.isInline)
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS).printInlineForThunk();
ClangRepresentation resultingRepresentation =
ClangRepresentation::representable;
// Print out the return type.
if (FD->hasThrows() && outputLang == OutputLanguageMode::Cxx)
functionSignatureOS << "swift::ThrowingResult<";
if (kind == FunctionSignatureKind::CFunctionProto) {
// First, verify that the C++ return type is representable.
{
OptionalTypeKind optKind;
Type objTy;
std::tie(objTy, optKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(FD, resultTy);
CFunctionSignatureTypePrinter typePrinter(
llvm::nulls(), llvm::nulls(), typeMapping, OutputLanguageMode::Cxx,
interopContext, CFunctionSignatureTypePrinterModifierDelegate(),
emittedModule, declPrinter, FunctionSignatureTypeUse::ReturnType);
if (resultingRepresentation
.merge(typePrinter.visit(objTy, optKind, /*isInOutParam=*/false))
.isUnsupported())
return resultingRepresentation;
}
auto directResultType = signature.getDirectResultType();
// FIXME: support direct + indirect results.
if (directResultType && signature.getNumIndirectResultValues() > 0)
return ClangRepresentation::unsupported;
// FIXME: support multiple indirect results.
if (signature.getNumIndirectResultValues() > 1)
return ClangRepresentation::unsupported;
if (!directResultType) {
functionSignatureOS << "void";
} else {
if (!printDirectReturnOrParamCType(
*directResultType, resultTy, emittedModule, functionSignatureOS,
cPrologueOS, typeMapping, interopContext, [&]() {
OptionalTypeKind retKind;
Type objTy;
std::tie(objTy, retKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(FD,
resultTy);
auto s = printClangFunctionReturnType(
functionSignatureOS, objTy, retKind, emittedModule,
outputLang);
assert(!s.isUnsupported());
}))
return ClangRepresentation::unsupported;
}
} else {
OptionalTypeKind retKind;
Type objTy;
std::tie(objTy, retKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(FD, resultTy);
if (resultingRepresentation
.merge(printClangFunctionReturnType(
functionSignatureOS, objTy, retKind, emittedModule, outputLang))
.isUnsupported())
return resultingRepresentation;
}
if (FD->hasThrows() && outputLang == OutputLanguageMode::Cxx)
functionSignatureOS << ">";
functionSignatureOS << ' ';
if (const auto *typeDecl = modifiers.qualifierContext)
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS)
.printNominalTypeQualifier(typeDecl, typeDecl->getModuleContext());
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS).printIdentifier(name);
functionSignatureOS << '(';
bool HasParams = false;
if (kind == FunctionSignatureKind::CFunctionProto) {
// First, verify that the C++ param types are representable.
for (auto param : *FD->getParameters()) {
OptionalTypeKind optKind;
Type objTy;
std::tie(objTy, optKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(
FD, param->getInterfaceType());
CFunctionSignatureTypePrinter typePrinter(
llvm::nulls(), llvm::nulls(), typeMapping, OutputLanguageMode::Cxx,
interopContext, CFunctionSignatureTypePrinterModifierDelegate(),
emittedModule, declPrinter, FunctionSignatureTypeUse::ParamType);
if (resultingRepresentation
.merge(typePrinter.visit(objTy, optKind,
/*isInOutParam=*/param->isInOut()))
.isUnsupported())
return resultingRepresentation;
}
bool needsComma = false;
auto emitNewParam = [&]() {
if (needsComma)
functionSignatureOS << ", ";
needsComma = true;
};
auto printParamName = [&](const ParamDecl ¶m) {
std::string paramName =
param.getName().empty() ? "" : param.getName().str().str();
if (param.isSelfParameter())
paramName = "_self";
if (!paramName.empty()) {
functionSignatureOS << ' ';
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS).printIdentifier(paramName);
}
};
auto printParamCType = [&](const ParamDecl ¶m) {
OptionalTypeKind optionalKind;
Type ty;
std::tie(ty, optionalKind) =
DeclAndTypePrinter::getObjectTypeAndOptionality(
¶m, param.getInterfaceType());
CFunctionSignatureTypePrinter typePrinter(
functionSignatureOS, cPrologueOS, typeMapping, outputLang,
interopContext, CFunctionSignatureTypePrinterModifierDelegate(),
emittedModule, declPrinter);
auto s = typePrinter.visit(ty, optionalKind, param.isInOut());
resultingRepresentation.merge(s);
};
signature.visitParameterList(
[&](const LoweredFunctionSignature::IndirectResultValue
&indirectResult) {
emitNewParam();
if (indirectResult.hasSRet())
functionSignatureOS << "SWIFT_INDIRECT_RESULT ";
// FIXME: it would be nice to print out the C struct type here.
functionSignatureOS << "void * _Nonnull";
},
[&](const LoweredFunctionSignature::DirectParameter ¶m) {
emitNewParam();
printDirectReturnOrParamCType(
param, param.getParamDecl().getInterfaceType(), emittedModule,
functionSignatureOS, cPrologueOS, typeMapping, interopContext,
[&]() { printParamCType(param.getParamDecl()); });
printParamName(param.getParamDecl());
},
[&](const LoweredFunctionSignature::IndirectParameter ¶m) {
emitNewParam();
if (param.getParamDecl().isSelfParameter())
functionSignatureOS << "SWIFT_CONTEXT ";
bool isConst =
!param.getParamDecl().isInOut() &&
!(param.getParamDecl().isSelfParameter() &&
!param.getParamDecl().getInterfaceType()->hasTypeParameter() &&
param.getParamDecl()
.getInterfaceType()
->isAnyClassReferenceType());
if (isConst)
functionSignatureOS << "const ";
if (isKnownCType(param.getParamDecl().getInterfaceType(),
typeMapping) ||
(!param.getParamDecl().getInterfaceType()->hasTypeParameter() &&
param.getParamDecl()
.getInterfaceType()
->isAnyClassReferenceType()))
printParamCType(param.getParamDecl());
else
functionSignatureOS << "void * _Nonnull";
printParamName(param.getParamDecl());
},
[&](const LoweredFunctionSignature::GenericRequirementParameter
&genericRequirementParam) {
emitNewParam();
functionSignatureOS << "void * _Nonnull ";
auto reqt = genericRequirementParam.getRequirement();
if (reqt.isAnyWitnessTable())
ClangSyntaxPrinter(FD->getASTContext(), functionSignatureOS)
.printBaseName(reqt.getProtocol());
else
assert(reqt.isAnyMetadata());
},
[&](const LoweredFunctionSignature::MetadataSourceParameter
&metadataSrcParam) {
emitNewParam();
functionSignatureOS << "void * _Nonnull ";
},
[&](const LoweredFunctionSignature::ContextParameter &) {
emitNewParam();
functionSignatureOS << "SWIFT_CONTEXT void * _Nonnull _ctx";
},
[&](const LoweredFunctionSignature::ErrorResultValue &) {
emitNewParam();
functionSignatureOS
<< "SWIFT_ERROR_RESULT void * _Nullable * _Nullable _error";
});
if (needsComma == false)
// Emit 'void' in an empty parameter list for C function declarations.
functionSignatureOS << "void";
functionSignatureOS << ')';
if (!resultingRepresentation.isUnsupported()) {
if (resultingRepresentation.isObjCxxOnly())
os << "#if defined(__OBJC__)\n";
os << "SWIFT_EXTERN ";
os << functionSignatureOS.str();
}
return resultingRepresentation;