Add support for [noinline] attribute (#1650)

This adds the `[noinline]` attribute to the front-end, and passes it through when generating HLSL output.

Notes:

* This change doesn't include a test since the dxc version I have locally parses `[noinline]` but then generates DXIL that fails validation.

* This change doesn't include logic to handle `[noinline]` for other targets. Notably, SPIR-V has decorations that convey the same intention, but we don't yet take advantage of the GLSL extension(s) that would let us generate those decorations.

* By necesstiy, `[noinline]` is only a "strong suggestion" and not actually something the compiler can ever guarantee/enforce.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/slang/slang-emit-c-like.cpp b/source/slang/slang-emit-c-like.cpp
index facb8a710..44564e575 100644
--- a/source/slang/slang-emit-c-like.cpp
+++ b/source/slang/slang-emit-c-like.cpp
@@ -3160,6 +3160,7 @@ void CLikeSourceEmitter::emitSimpleFuncImpl(IRFunc* func)
 
     auto name = getName(func);
 
+    emitFuncDecorations(func);
     emitType(resultType, name);
     emitSimpleFuncParamsImpl(func);
     emitSemantics(func);
@@ -3268,6 +3269,7 @@ void CLikeSourceEmitter::emitFuncDecl(IRFunc* func)
 
     auto name = getName(func);
 
+    emitFuncDecorations(func);
     emitType(resultType, name);
 
     m_writer->emit("(");
@@ -3344,6 +3346,15 @@ void CLikeSourceEmitter::emitFunc(IRFunc* func)
     }
 }
 
+void CLikeSourceEmitter::emitFuncDecorations(IRFunc* func)
+{
+    for(auto decoration : func->getDecorations())
+    {
+        emitFuncDecorationImpl(decoration);
+    }
+}
+
+
 void CLikeSourceEmitter::emitStruct(IRStructType* structType)
 {
     // If the selected `struct` type is actually an intrinsic