================
@@ -183,6 +183,86 @@ void Parser::ParseHLSLAnnotations(ParsedAttributes &Attrs,
return;
}
} break;
+ case ParsedAttr::AT_HLSLPackOffset: {
+ // Parse 'packoffset( c[Subcomponent][.component] )'.
+ // Check '('.
+ if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after)) {
+ SkipUntil(tok::r_paren, StopAtSemi); // skip through )
+ return;
+ }
+ // Check c[Subcomponent] as an identifier.
+ if (!Tok.is(tok::identifier)) {
+ Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
+ SkipUntil(tok::r_paren, StopAtSemi); // skip through )
+ return;
+ }
+ StringRef OffsetStr = Tok.getIdentifierInfo()->getName();
+ SourceLocation OffsetLoc = Tok.getLocation();
+ if (OffsetStr[0] != 'c') {
+ Diag(Tok.getLocation(), diag::err_hlsl_packoffset_invalid_reg)
+ << OffsetStr;
+ SkipUntil(tok::r_paren, StopAtSemi); // skip through )
+ return;
+ }
+ OffsetStr = OffsetStr.substr(1);
+ unsigned SubComponent = 0;
+ if (!OffsetStr.empty()) {
+ // Make sure SubComponent is a number.
+ if (OffsetStr.getAsInteger(10, SubComponent)) {
+ Diag(OffsetLoc.getLocWithOffset(1),
+ diag::err_hlsl_unsupported_register_number);
+ return;
+ }
+ }
+ unsigned Component = 0;
+ ConsumeToken(); // consume identifier.
+ if (Tok.is(tok::period)) {
+ ConsumeToken(); // consume period.
+ if (!Tok.is(tok::identifier)) {
+ Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
+ SkipUntil(tok::r_paren, StopAtSemi); // skip through )
+ return;
+ }
+ StringRef ComponentStr = Tok.getIdentifierInfo()->getName();
+ SourceLocation SpaceLoc = Tok.getLocation();
+ ConsumeToken(); // consume identifier.
+ // Make sure Component is a single character.
+ if (ComponentStr.size() != 1) {
+ Diag(SpaceLoc, diag::err_hlsl_unsupported_component) << ComponentStr;
+ SkipUntil(tok::r_paren, StopAtSemi); // skip through )
+ return;
+ } else {
----------------
hekota wrote:
Nit - `else` is not needed here because the `if` branch returns.
https://github.com/llvm/llvm-project/pull/89836
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