[llvm-branch-commits] [clang] [HLSL] Define the HLSLRootSignature Attr (PR #123985)

[Sarah Spall via llvm-branch-commits]

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@@ -647,6 +648,40 @@ void SemaHLSL::emitLogicalOperatorFixIt(Expr *LHS, Expr *RHS,
       << NewFnName << FixItHint::CreateReplacement(FullRange, OS.str());
 }
 
+void SemaHLSL::handleRootSignatureAttr(Decl *D, const ParsedAttr &AL) {
+  if (AL.getNumArgs() != 1)
+    return;
+
+  StringRef Signature;
+  if (!SemaRef.checkStringLiteralArgumentAttr(AL, 0, Signature))
+    return;
+
+  SourceLocation Loc = AL.getArgAsExpr(0)->getExprLoc();
+  // FIXME: pass down below to lexer when fp is supported
+  // llvm::RoundingMode RM = SemaRef.CurFPFeatures.getRoundingMode();
+  SmallVector<hlsl::RootSignatureToken> Tokens;
+  hlsl::RootSignatureLexer Lexer(Signature, Loc, SemaRef.getPreprocessor());
+  if (Lexer.Lex(Tokens))
+    return;
+
+  SmallVector<llvm::hlsl::rootsig::RootElement> Elements;
+  hlsl::RootSignatureParser Parser(Elements, Tokens,
+                                   SemaRef.getPreprocessor().getDiagnostics());
+  if (Parser.Parse())
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spall wrote:

The parser and lexer were defined/tested in a different PR?

https://github.com/llvm/llvm-project/pull/123985