From b915ae662b2e4bcaaeb6da62eb964356d0a978b4 Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Thu, 5 May 2022 15:53:29 -0400
Subject: Support for HLSL `export` (#2223)

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

* Add support for HLSL `export`.

* Test for using `export` keyword.
---
 source/slang/slang-emit-hlsl.cpp | 46 +++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 17 deletions(-)

(limited to 'source/slang/slang-emit-hlsl.cpp')

diff --git a/source/slang/slang-emit-hlsl.cpp b/source/slang/slang-emit-hlsl.cpp
index 650012b9f..945f00499 100644
--- a/source/slang/slang-emit-hlsl.cpp
+++ b/source/slang/slang-emit-hlsl.cpp
@@ -727,28 +727,40 @@ void HLSLSourceEmitter::emitLoopControlDecorationImpl(IRLoopControlDecoration* d
     }
 }
 
-void HLSLSourceEmitter::emitFuncDecorationImpl(IRDecoration* decoration)
+static bool _canEmitExport(const Profile& profile)
 {
-    switch( decoration->getOp() )
-    {
-    case kIROp_PublicDecoration:
+    const auto family = profile.getFamily();
+    const auto version = profile.getVersion();
+    // Is ita late enough version of shader model to output with 'export'
+    return (family == ProfileFamily::DX && version >= ProfileVersion::DX_6_1);
+}
+
+/* virtual */void HLSLSourceEmitter::emitFuncDecorationsImpl(IRFunc* func)
+{
+    // Specially handle export, as we don't want to emit it multiple times
+    if (getTargetReq()->isWholeProgramRequest() && 
+        _canEmitExport(m_effectiveProfile))
     {
-        auto profile = m_effectiveProfile;
-        
-        const auto family = profile.getFamily();
-        const auto version = profile.getVersion();
-
-        // If it's whole program and it's for a late enough version of shader model
-        // output with 'export'
-        if (getTargetReq()->isWholeProgramRequest() &&
-            family == ProfileFamily::DX &&
-            version >= ProfileVersion::DX_6_1)
+        for (auto decoration : func->getDecorations())
         {
-            m_writer->emit("export\n");
+            const auto op = decoration->getOp();
+            if (op == kIROp_PublicDecoration ||
+                op == kIROp_HLSLExportDecoration)
+            {
+                m_writer->emit("export\n");
+                break;
+            }
         }
-        break;
     }
-        
+
+    // Use the default for others
+    Super::emitFuncDecorationsImpl(func);
+}
+
+void HLSLSourceEmitter::emitFuncDecorationImpl(IRDecoration* decoration)
+{
+    switch( decoration->getOp() )
+    {
     case kIROp_NoInlineDecoration:
         m_writer->emit("[noinline]\n");
         break;
-- 
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