Merge pull request #74516 from swiftlang/gaborh/objcpp-fix

[cxx-interop] Fix exporting cdecl Swift functions to Obj-C++

Author: Xazax-hun

lib/PrintAsClang/DeclAndTypePrinter.cpp

@@ -1441,6 +1441,7 @@ class DeclAndTypePrinter::Implementation
     os << "SWIFT_EXTERN ";
     printFunctionDeclAsCFunctionDecl(FD, FD->getCDeclName(), resultTy);
     printFunctionClangAttributes(FD, funcTy);
+    os << " SWIFT_NOEXCEPT";
     printAvailability(FD);
     os << ";\n";
   }

test/Interop/SwiftToCxx/functions/swift-functions.swift

@@ -6,6 +6,10 @@ import CxxStdlib
 
 // RUN: %check-interop-cxx-header-in-clang(%t/functions.h)
 
+@_cdecl("cdeclFunction") public func cdeclFunction(_ x: CInt) {}
+
+// CHECK: SWIFT_EXTERN void cdeclFunction(int x) SWIFT_NOEXCEPT;
+
 // CHECK-LABEL: namespace Functions SWIFT_PRIVATE_ATTR SWIFT_SYMBOL_MODULE("Functions") {
 
 // CHECK-LABEL: namespace _impl {

test/PrintAsObjC/cdecl-imports.swift

@@ -12,19 +12,19 @@ import Foundation
 // CHECK-NOT: @import Foundation;
 
 // CHECK: @class Bee;
-// CHECK-LABEL: Bee * _Nonnull fwd_declares_bee(void) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: Bee * _Nonnull fwd_declares_bee(void) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 
 @_cdecl("fwd_declares_bee")
 public func fwdDeclaresBee() -> Bee { fatalError() }
 
 // CHECK: @class Hive;
-// CHECK-LABEL: void fwd_declares_hive(Hive * _Nonnull (* _Nonnull bzzz)(Bee * _Nonnull));
+// CHECK-LABEL: void fwd_declares_hive(Hive * _Nonnull (* _Nonnull bzzz)(Bee * _Nonnull)) SWIFT_NOEXCEPT;
 
 @_cdecl("fwd_declares_hive")
 public func fwdDeclaresHive(bzzz: @convention(c) (Bee) -> Hive) { fatalError() }
 
 // CHECK: @protocol NSWobbling;
-// CHECK-LABEL: void fwd_declares_wobble(id <NSWobbling> _Nonnull wobbler);
+// CHECK-LABEL: void fwd_declares_wobble(id <NSWobbling> _Nonnull wobbler) SWIFT_NOEXCEPT;
 
 @_cdecl("fwd_declares_wobble")
 public func fwdDeclaresWobble(wobbler: NSWobbling) { fatalError() }

test/PrintAsObjC/cdecl.swift

@@ -8,51 +8,51 @@
 // REQUIRES: objc_interop
 
 // CHECK: /// What a nightmare!
-// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_nightmare(SWIFT_NOESCAPE float (^ _Nonnull x)(NSInteger)))(char) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_nightmare(SWIFT_NOESCAPE float (^ _Nonnull x)(NSInteger)))(char) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 
 /// What a nightmare!
 @_cdecl("block_nightmare")
 public func block_nightmare(x: @convention(block) (Int) -> Float)
   -> @convention(block) (CChar) -> Double { return { _ in 0 } }
 
-// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_recurring_nightmare(float (^ _Nonnull x)(SWIFT_NOESCAPE NSInteger (^ _Nonnull)(double))))(SWIFT_NOESCAPE char (^ _Nonnull)(unsigned char)) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: SWIFT_EXTERN double (^ _Nonnull block_recurring_nightmare(float (^ _Nonnull x)(SWIFT_NOESCAPE NSInteger (^ _Nonnull)(double))))(SWIFT_NOESCAPE char (^ _Nonnull)(unsigned char)) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 @_cdecl("block_recurring_nightmare")
 public func block_recurring_nightmare(x: @escaping @convention(block) (@convention(block) (Double) -> Int) -> Float)
   -> @convention(block) (_ asdfasdf: @convention(block) (CUnsignedChar) -> CChar) -> Double {
   fatalError()
 }
 
-// CHECK-LABEL: SWIFT_EXTERN void foo_bar(NSInteger x, NSInteger y);
+// CHECK-LABEL: SWIFT_EXTERN void foo_bar(NSInteger x, NSInteger y) SWIFT_NOEXCEPT;
 @_cdecl("foo_bar")
 func foo(x: Int, bar y: Int) {}
 
-// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_nightmare(float (* _Nonnull x)(NSInteger)))(char) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_nightmare(float (* _Nonnull x)(NSInteger)))(char) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 @_cdecl("function_pointer_nightmare")
 func function_pointer_nightmare(x: @convention(c) (Int) -> Float)
   -> @convention(c) (CChar) -> Double { return { _ in 0 } }
 
-// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_recurring_nightmare(float (* _Nonnull x)(NSInteger (* _Nonnull)(double))))(char (* _Nonnull)(unsigned char)) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: SWIFT_EXTERN double (* _Nonnull function_pointer_recurring_nightmare(float (* _Nonnull x)(NSInteger (* _Nonnull)(double))))(char (* _Nonnull)(unsigned char)) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 @_cdecl("function_pointer_recurring_nightmare")
 public func function_pointer_recurring_nightmare(x: @escaping @convention(c) (@convention(c) (Double) -> Int) -> Float)
   -> @convention(c) (@convention(c) (CUnsignedChar) -> CChar) -> Double {
   fatalError()
 }
 
-// CHECK-LABEL: SWIFT_EXTERN void has_keyword_arg_names(NSInteger auto_, NSInteger union_);
+// CHECK-LABEL: SWIFT_EXTERN void has_keyword_arg_names(NSInteger auto_, NSInteger union_) SWIFT_NOEXCEPT;
 @_cdecl("has_keyword_arg_names")
 func keywordArgNames(auto: Int, union: Int) {}
 
 @objc
 class C {}
 
-// CHECK-LABEL: SWIFT_EXTERN C * _Null_unspecified return_iuo(void) SWIFT_WARN_UNUSED_RESULT;
+// CHECK-LABEL: SWIFT_EXTERN C * _Null_unspecified return_iuo(void) SWIFT_WARN_UNUSED_RESULT SWIFT_NOEXCEPT;
 @_cdecl("return_iuo")
 func returnIUO() -> C! { return C() }
 
-// CHECK-LABEL: SWIFT_EXTERN void return_never(void) SWIFT_NORETURN;
+// CHECK-LABEL: SWIFT_EXTERN void return_never(void) SWIFT_NORETURN SWIFT_NOEXCEPT;
 @_cdecl("return_never")
 func returnNever() -> Never { fatalError() }
 
-// CHECK-LABEL: SWIFT_EXTERN void takes_iuo(C * _Null_unspecified c);
+// CHECK-LABEL: SWIFT_EXTERN void takes_iuo(C * _Null_unspecified c) SWIFT_NOEXCEPT;
 @_cdecl("takes_iuo")
 func takesIUO(c: C!) {}