================
@@ -0,0 +1,188 @@
+#include "clang/Parse/ParseHLSLRootSignature.h"
+
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm::hlsl::rootsig;
+
+namespace clang {
+namespace hlsl {
+
+static std::string FormatTokenKinds(ArrayRef<TokenKind> Kinds) {
+ std::string TokenString;
+ llvm::raw_string_ostream Out(TokenString);
+ bool First = true;
+ for (auto Kind : Kinds) {
+ if (!First)
+ Out << ", ";
+ switch (Kind) {
+#define TOK(X, SPELLING)
\
+ case TokenKind::X:
\
+ Out << SPELLING;
\
+ break;
+#include "clang/Lex/HLSLRootSignatureTokenKinds.def"
+ }
+ First = false;
+ }
+
+ return TokenString;
+}
+
+// Parser Definitions
+
+RootSignatureParser::RootSignatureParser(SmallVector<RootElement> &Elements,
+ RootSignatureLexer &Lexer,
+ Preprocessor &PP)
+ : Elements(Elements), Lexer(Lexer), PP(PP), CurToken(SourceLocation()) {}
+
+bool RootSignatureParser::Parse() {
+ // Iterate as many RootElements as possible
+ while (TryConsumeExpectedToken(TokenKind::kw_DescriptorTable)) {
+ bool Error = false;
+ // Dispatch onto parser method.
+ // We guard against the unreachable here as we just ensured that CurToken
+ // will be one of the kinds in the while condition
+ switch (CurToken.Kind) {
+ case TokenKind::kw_DescriptorTable:
+ Error = ParseDescriptorTable();
+ break;
+ default:
+ llvm_unreachable("Switch for consumed token was not provided");
+ }
+
+ if (Error)
+ return true;
+
+ if (!TryConsumeExpectedToken(TokenKind::pu_comma))
+ break;
+ }
+
+ return ConsumeExpectedToken(TokenKind::end_of_stream, diag::err_expected);
+}
+
+bool RootSignatureParser::ParseDescriptorTable() {
+ assert(CurToken.Kind == TokenKind::kw_DescriptorTable &&
+ "Expects to only be invoked starting at given keyword");
+
+ DescriptorTable Table;
+
+ if (ConsumeExpectedToken(TokenKind::pu_l_paren, diag::err_expected_after,
+ CurToken.Kind))
+ return true;
+
+ // Iterate as many Clauses as possible
+ while (TryConsumeExpectedToken({TokenKind::kw_CBV, TokenKind::kw_SRV,
----------------
joaosaffran wrote:
nit: I imagine the above loop would be something like this, once you add more
Root Elements?
https://github.com/llvm/llvm-project/pull/133302
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