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[cxx-interop] Support nested structs

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It is really involved to change how methods and classes are emitted into
the header so this patch introduces the impression of nested structs
through using statements and still emits the structs themselves as top
level structs. It emits them in their own namespace to avoid name
collisions. This patch also had to change some names to be fully
qualified to avoid some name lookup errors in case of nested structs.
Moreover, nesting level of 3 and above requires C++17 because it relies
on nested namespaces. Only nested structs are supported, not nested
classes.

Since this patch is already started to grow quite big, I decided to put
it out for reviews and plan to address some of the shortcomings in a
follow-up PR.

rdar://118793469
This commit is contained in:
Gabor Horvath
2024-07-24 10:30:51 +02:00
parent 3f916f504e
commit 94b466656e
45 changed files with 854 additions and 659 deletions
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4
test/Interop/SwiftToCxx/functions/swift-functions-errors.swift
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@@ -121,7 +121,7 @@ public func throwFunctionWithPossibleReturn(_ a: Int) throws -> Int {
// CHECK: SWIFT_INLINE_THUNK swift::ThrowingResult<swift::Int> throwFunctionWithPossibleReturn(swift::Int a) SWIFT_SYMBOL("s:9Functions31throwFunctionWithPossibleReturnyS2iKF") SWIFT_WARN_UNUSED_RESULT {
// CHECK: void* opaqueError = nullptr;
// CHECK: void* _ctx = nullptr;
// CHECK: auto returnValue = _impl::$s9Functions31throwFunctionWithPossibleReturnyS2iKF(a, _ctx, &opaqueError);
// CHECK: auto returnValue = Functions::_impl::$s9Functions31throwFunctionWithPossibleReturnyS2iKF(a, _ctx, &opaqueError);
// CHECK: if (opaqueError != nullptr)
// CHECK: #ifdef __cpp_exceptions
// CHECK: throw (swift::Error(opaqueError));
@@ -141,7 +141,7 @@ public func throwFunctionWithReturn() throws -> Int {
// CHECK: SWIFT_INLINE_THUNK swift::ThrowingResult<swift::Int> throwFunctionWithReturn() SWIFT_SYMBOL("s:9Functions23throwFunctionWithReturnSiyKF") SWIFT_WARN_UNUSED_RESULT {
// CHECK: void* opaqueError = nullptr;
// CHECK: void* _ctx = nullptr;
// CHECK: auto returnValue = _impl::$s9Functions23throwFunctionWithReturnSiyKF(_ctx, &opaqueError);
// CHECK: auto returnValue = Functions::_impl::$s9Functions23throwFunctionWithReturnSiyKF(_ctx, &opaqueError);
// CHECK: #ifdef __cpp_exceptions
// CHECK: throw (swift::Error(opaqueError));
// CHECK: #else