From 812e478989e27983b8dea7ab11964de751654ba2 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 4 Jun 2025 13:05:58 -0700
Subject: Make interface types non c-style in Slang2026. (#7260)

* Make interface types non c-style.

* Make Optional<T> work with autodiff and existential types.

* Fix.

* patch behind slang 2026.

* Fix warnings.

* cleanup.

* Fix tests.

* Fix.

* Fix com interface lowering.

* Add comment to test.

* regenerate command line reference

* Add test for passing `none` to autodiff function.

* Fix recording of `getDynamicObjectRTTIBytes`.

* Fix nested Optional types.

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
---
 .../interfaces/optional-none.slang                 | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 tests/language-feature/interfaces/optional-none.slang

(limited to 'tests/language-feature/interfaces/optional-none.slang')

diff --git a/tests/language-feature/interfaces/optional-none.slang b/tests/language-feature/interfaces/optional-none.slang
new file mode 100644
index 000000000..04bb8f83e
--- /dev/null
+++ b/tests/language-feature/interfaces/optional-none.slang
@@ -0,0 +1,47 @@
+// Test that the size of an optional interface type is the same as the existential box.
+
+//TEST:SIMPLE(filecheck=CHECK): -target hlsl -conformance "Impl1:IFoo=1" -entry computeMain -profile cs_6_0
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=BUFFER): -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=BUFFER): -vk -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+interface IFoo
+{
+    int method();
+}
+
+//TEST_INPUT: type_conformance Impl1:IFoo = 0
+struct Impl1 : IFoo
+{
+    int data;
+    int method() { return data + 1; }
+}
+
+struct MyType
+{
+    Optional<IFoo> foo;
+}
+
+Optional<T> process<T>(Optional<T> opt)
+{
+    return opt;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    MyType t = {};
+    t.foo = process(t.foo);
+
+    // BUFFER: 100
+    if (let f = t.foo)
+        outputBuffer[0] = f.method();
+    else
+        outputBuffer[0] = 100;
+}
+
+// CHECK: struct MyType
+// CHECK-NEXT: {
+// CHECK-NEXT: Tuple{{.*}} foo{{.*}};
\ No newline at end of file
-- 
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