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//===--- PrimitiveTypeMapping.h - Mapping primitive types -------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_PRINTASCLANG_PRIMITIVETYPEMAPPING_H
#define SWIFT_PRINTASCLANG_PRIMITIVETYPEMAPPING_H
#include "swift/AST/Identifier.h"
#include "swift/Basic/LLVM.h"
#include "llvm/ADT/DenseMap.h"
namespace swift {
class ASTContext;
class TypeDecl;
/// Provides a mapping from Swift's primitive types to C / Objective-C / C++
/// primitive types.
///
/// Certain types have mappings that differ in different language modes.
/// For example, Swift's `Int` maps to `NSInteger` for Objective-C declarations,
/// but to something like `intptr_t` or `swift::Int` for C and C++ declarations.
class PrimitiveTypeMapping {
public:
struct ClangTypeInfo {
StringRef name;
bool canBeNullable;
};
/// Returns the Objective-C type name and nullability for the given Swift
/// primitive type declaration, or \c None if no such type name exists.
std::optional<ClangTypeInfo> getKnownObjCTypeInfo(const TypeDecl *typeDecl);
/// Returns the C type name and nullability for the given Swift
/// primitive type declaration, or \c None if no such type name exists.
std::optional<ClangTypeInfo> getKnownCTypeInfo(const TypeDecl *typeDecl);
/// Returns the C++ type name and nullability for the given Swift
/// primitive type declaration, or \c None if no such type name exists.
std::optional<ClangTypeInfo> getKnownCxxTypeInfo(const TypeDecl *typeDecl);
private:
void initialize(ASTContext &ctx);
struct FullClangTypeInfo {
// The Objective-C name of the Swift type.
StringRef objcName;
// The C name of the Swift type.
std::optional<StringRef> cName;
// The C++ name of the Swift type.
std::optional<StringRef> cxxName;
bool canBeNullable;
};
FullClangTypeInfo *getMappedTypeInfoOrNull(const TypeDecl *typeDecl);
/// A map from {Module, TypeName} pairs to {C name, C nullability} pairs.
///
/// This is populated on first use with a list of known Swift types that are
/// translated directly by the ObjC printer instead of structurally, allowing
/// it to do things like map 'Int' to 'NSInteger' and 'Float' to 'float'.
/// In some sense it's the reverse of the ClangImporter's MappedTypes.def.
llvm::DenseMap<std::pair<Identifier, Identifier>, FullClangTypeInfo>
mappedTypeNames;
};
} // end namespace swift
#endif
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