[clang] [HLSL] Support packoffset attribute in AST (PR #89836)

[Helena Kotas via cfe-commits]

================
@@ -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);
----------------
hekota wrote:

Add `SkipUntil(tok::r_paren, StopAtSemi); // skip through )`

https://github.com/llvm/llvm-project/pull/89836
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