Merge pull request swiftlang#42511 from zoecarver/add-flag-import-as-computed-property

Author: zoecarver

include/swift/Basic/LangOptions.h

@@ -281,6 +281,9 @@ namespace swift {
     /// disabled because it is not complete.
     bool EnableCXXInterop = false;
 
+    /// Imports getters and setters as computed properties.
+    bool CxxInteropGettersSettersAsProperties = false;
+
     /// On Darwin platforms, use the pre-stable ABI's mark bit for Swift
     /// classes instead of the stable ABI's bit. This is needed when
     /// targeting OSes prior to macOS 10.14.4 and iOS 12.2, where

include/swift/Option/FrontendOptions.td

@@ -836,6 +836,11 @@ def enable_cxx_interop :
   HelpText<"Alias for -enable-experimental-cxx-interop">,
   Flags<[FrontendOption, HelpHidden]>;
 
+def cxx_interop_getters_setters_as_properties :
+  Flag<["-"], "cxx-interop-getters-setters-as-properties">,
+  HelpText<"Import getters and setters as computed properties in Swift">,
+  Flags<[FrontendOption, HelpHidden]>;
+
 def use_malloc : Flag<["-"], "use-malloc">,
   HelpText<"Allocate internal data structures using malloc "
            "(for memory debugging)">;

lib/ClangImporter/ImportDecl.cpp

@@ -4480,13 +4480,15 @@ namespace {
     Decl *VisitCXXMethodDecl(const clang::CXXMethodDecl *decl) {
       auto method = VisitFunctionDecl(decl);
 
-      CXXMethodBridging bridgingInfo(decl);
-      if (bridgingInfo.classify() == CXXMethodBridging::Kind::getter) {
-        auto name = bridgingInfo.getClangName().drop_front(3);
-        Impl.GetterSetterMap[name].first = static_cast<FuncDecl *>(method);
-      } else if (bridgingInfo.classify() == CXXMethodBridging::Kind::setter) {
-        auto name = bridgingInfo.getClangName().drop_front(3);
-        Impl.GetterSetterMap[name].second = static_cast<FuncDecl *>(method);
+      if (Impl.SwiftContext.LangOpts.CxxInteropGettersSettersAsProperties) {
+        CXXMethodBridging bridgingInfo(decl);
+        if (bridgingInfo.classify() == CXXMethodBridging::Kind::getter) {
+          auto name = bridgingInfo.getClangName().drop_front(3);
+          Impl.GetterSetterMap[name].first = static_cast<FuncDecl *>(method);
+        } else if (bridgingInfo.classify() == CXXMethodBridging::Kind::setter) {
+          auto name = bridgingInfo.getClangName().drop_front(3);
+          Impl.GetterSetterMap[name].second = static_cast<FuncDecl *>(method);
+        }
       }
 
       return method;

lib/Frontend/CompilerInvocation.cpp

@@ -807,6 +807,8 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
       Args.hasFlag(OPT_enable_objc_interop, OPT_disable_objc_interop,
                    Target.isOSDarwin());
 
+  Opts.CxxInteropGettersSettersAsProperties = Args.hasArg(OPT_cxx_interop_getters_setters_as_properties);
+
   Opts.VerifyAllSubstitutionMaps |= Args.hasArg(OPT_verify_all_substitution_maps);
 
   Opts.EnableVolatileModules |= Args.hasArg(OPT_enable_volatile_modules);

test/Interop/Cxx/ergonomics/implicit-computed-properties-module-interface.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-ide-test -print-module -module-to-print=ImplicitComputedProperties -I %S/Inputs -source-filename=x -enable-experimental-cxx-interop | %FileCheck %s
+// RUN: %target-swift-ide-test -print-module -module-to-print=ImplicitComputedProperties -I %S/Inputs -source-filename=x -enable-experimental-cxx-interop -cxx-interop-getters-setters-as-properties | %FileCheck %s
 
 // CHECK:      struct VoidGetter {
 // CHECK-NOT:     var

test/Interop/Cxx/ergonomics/implicit-computed-properties.swift

@@ -1,4 +1,4 @@
-// RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop)
+// RUN: %target-run-simple-swift(-I %S/Inputs -Xfrontend -enable-experimental-cxx-interop -Xfrontend -cxx-interop-getters-setters-as-properties)
 //
 // REQUIRES: executable_test
 //

tools/swift-ide-test/swift-ide-test.cpp

@@ -766,6 +766,11 @@ static llvm::cl::opt<bool>
                      llvm::cl::desc("Enable C++ interop."),
                      llvm::cl::cat(Category), llvm::cl::init(false));
 
+static llvm::cl::opt<bool>
+    CxxInteropGettersSettersAsProperties("cxx-interop-getters-setters-as-properties",
+        llvm::cl::desc("Imports getters and setters as computed properties."),
+        llvm::cl::cat(Category), llvm::cl::init(false));
+
 static llvm::cl::opt<bool>
 CanonicalizeType("canonicalize-type", llvm::cl::Hidden,
                    llvm::cl::cat(Category), llvm::cl::init(false));
@@ -4277,6 +4282,9 @@ int main(int argc, char *argv[]) {
   if (options::EnableCxxInterop) {
     InitInvok.getLangOptions().EnableCXXInterop = true;
   }
+  if (options::CxxInteropGettersSettersAsProperties) {
+    InitInvok.getLangOptions().CxxInteropGettersSettersAsProperties = true;
+  }
   if (options::EnableExperimentalConcurrency) {
     InitInvok.getLangOptions().EnableExperimentalConcurrency = true;
   }