pre-req: Add unbounded keyword to lexer

Author: Finn Plummer

clang/include/clang/Lex/HLSLRootSignatureTokenKinds.def

@@ -27,6 +27,9 @@
 #endif
 
 // Defines the various types of enum
+#ifndef UNBOUNDED_ENUM
+#define UNBOUNDED_ENUM(NAME, LIT) ENUM(NAME, LIT)
+#endif
 #ifndef DESCRIPTOR_RANGE_OFFSET_ENUM
 #define DESCRIPTOR_RANGE_OFFSET_ENUM(NAME, LIT) ENUM(NAME, LIT)
 #endif
@@ -87,6 +90,9 @@ KEYWORD(flags)
 KEYWORD(numDescriptors)
 KEYWORD(offset)
 
+// Unbounded Enum:
+UNBOUNDED_ENUM(unbounded, "unbounded")
+
 // Descriptor Range Offset Enum:
 DESCRIPTOR_RANGE_OFFSET_ENUM(DescriptorRangeOffsetAppend, "DESCRIPTOR_RANGE_OFFSET_APPEND")
 
@@ -118,6 +124,7 @@ SHADER_VISIBILITY_ENUM(Mesh, "SHADER_VISIBILITY_MESH")
 #undef DESCRIPTOR_RANGE_FLAG_ENUM_ON
 #undef ROOT_DESCRIPTOR_FLAG_ENUM
 #undef DESCRIPTOR_RANGE_OFFSET_ENUM
+#undef UNBOUNDED_ENUM
 #undef ENUM
 #undef KEYWORD
 #undef PUNCTUATOR

clang/unittests/Lex/LexHLSLRootSignatureTest.cpp

@@ -93,6 +93,7 @@ TEST_F(LexHLSLRootSignatureTest, ValidLexAllTokensTest) {
     space visibility flags
     numDescriptors offset
 
+    unbounded
     DESCRIPTOR_RANGE_OFFSET_APPEND
 
     DATA_VOLATILE