Add support for bitfields (#3639)

* Add support for bitfields

Closes https://github.com/shader-slang/slang/issues/3559

* Set scopes for syntsized bitfield accessors

* Simplify generated code for bitfield accessors

* spelling

* regenerate vs project

* warnings

1 files changed, 9 insertions, 0 deletions

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 5555647f4..3f1ed3f76 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -2970,6 +2970,15 @@ namespace Slang
             semantic->name = parser->ReadToken(TokenType::Identifier);
             return semantic;
         }
+        else if (parser->LookAheadToken(TokenType::IntegerLiteral))
+        {
+            BitFieldModifier* bitWidthMod = parser->astBuilder->create<BitFieldModifier>();
+            parser->FillPosition(bitWidthMod);
+            const auto token = parser->tokenReader.advanceToken();
+            UnownedStringSlice suffix;
+            bitWidthMod->width = getIntegerLiteralValue(token, &suffix);
+            return bitWidthMod;
+        }
         else if (parser->LookAheadToken(TokenType::CompletionRequest))
         {
             HLSLSimpleSemantic* semantic = parser->astBuilder->create<HLSLSimpleSemantic>();