================
@@ -0,0 +1,173 @@
+#include "clang/Parse/ParseHLSLRootSignature.h"
+
+namespace clang {
+namespace hlsl {
+
+// Lexer Definitions
+
+static bool IsNumberChar(char C) {
+ // TODO(#120472): extend for float support exponents
+ return isdigit(C); // integer support
+}
+
+bool RootSignatureLexer::LexNumber(RootSignatureToken &Result) {
+ // NumericLiteralParser does not handle the sign so we will manually apply it
+ bool Negative = Buffer.front() == '-';
+ bool Signed = Negative || Buffer.front() == '+';
+ if (Signed)
+ AdvanceBuffer();
+
+ // Retrieve the possible number
+ StringRef NumSpelling = Buffer.take_while(IsNumberChar);
+
+ // Catch this now as the Literal Parser will accept it as valid
+ if (NumSpelling.empty()) {
+ PP.getDiagnostics().Report(Result.TokLoc,
+ diag::err_hlsl_invalid_number_literal);
+ return true;
+ }
+
+ // Parse the numeric value and do semantic checks on its specification
+ clang::NumericLiteralParser Literal(NumSpelling, SourceLoc,
+ PP.getSourceManager(), PP.getLangOpts(),
+ PP.getTargetInfo(), PP.getDiagnostics());
+ if (Literal.hadError)
+ return true; // Error has already been reported so just return
+
+ if (!Literal.isIntegerLiteral()) {
+ // Note: if IsNumberChar allows for hexidecimal we will need to turn this
+ // into a diagnostics for potential fixed-point literals
+ llvm_unreachable("IsNumberChar will only support digits");
+ return true;
+ }
+
+ // Retrieve the number value to store into the token
+ Result.Kind = TokenKind::int_literal;
+
+ llvm::APSInt X = llvm::APSInt(32, !Signed);
----------------
bogner wrote:
What happens if we have a value like `+2147483648`? This would fit in an
unsigned 32-bit int, but not a signed one. However, we're deciding that the
value is signed if the `+` is present above. Will this error and tell us that
there's overflow, treat the value as unsigned because of the range, or give us
a garbage negative number?
If it's one of the first two options, does the one we're implementing match
DXC's behaviour here?
https://github.com/llvm/llvm-project/pull/122981
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