`export` support in HLSL (#2188)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Compile to a dxil library.

* Added CompileProduct.

* Support handling of ModuleLibrary.

* CacheBehavior -> Cache

* Use CompileProduct for -r references.

* CompileProduct -> Artifact.

* Determining an artifact type on binding.

* Determine binary linkability.

* Added Artifact::exists.

* Added ArtifactKeep.

* Small fixes.

* Small improvements to Artifact.

* Add zip extension.

* Fix some comments.

* Fix multiple adding of PublicDecoration.
Make public output export for DXIL/lib.
Add checking for simpleDecorations such that only added once.

* Use 'whole program' to identify library build.

* Add -target dxil so test infrastructure knows it needs DXC.

1 files changed, 22 insertions, 0 deletions

diff --git a/source/slang/slang-emit-hlsl.cpp b/source/slang/slang-emit-hlsl.cpp
index 09749546a..059a3f641 100644
--- a/source/slang/slang-emit-hlsl.cpp
+++ b/source/slang/slang-emit-hlsl.cpp
@@ -731,6 +731,28 @@ void HLSLSourceEmitter::emitFuncDecorationImpl(IRDecoration* decoration)
 {
     switch( decoration->getOp() )
     {
+    case kIROp_PublicDecoration:
+    {
+        auto profile = m_effectiveProfile;
+        
+        const auto family = profile.getFamily();
+        const auto stage = profile.getStage();
+        const auto version = profile.getVersion();
+
+        // I would perhaps ideally know that this was being compiled for 'library' stage.
+        // Stage::Unknown is currently also used for lib profiles.
+
+        // TODO(JS): Potentially can do export for fxc too, but for now we don't add.
+        
+        if (family == ProfileFamily::DX &&
+            version >= ProfileVersion::DX_6_1 &&
+            stage == Stage::Unknown)
+        {
+            m_writer->emit("export\n");
+        }
+        break;
+    }
+        
     case kIROp_NoInlineDecoration:
         m_writer->emit("[noinline]\n");
         break;