[PATCH] D157201: [Clang] Support qualified name as member designator in offsetof

[Yichi Lee via Phabricator via cfe-commits]

yichi170 created this revision.
Herald added a project: All.
yichi170 requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157201

Files:
  clang/include/clang/Sema/Sema.h
  clang/lib/Parse/ParseExpr.cpp
  clang/lib/Sema/SemaExpr.cpp


Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -16692,6 +16692,10 @@
     if (!MemberDecl) {
       if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
         MemberDecl = IndirectMemberDecl->getAnonField();
+
+      IdentifierInfo *II = RD->getIdentifier();
+      if (II == OC.U.IdentInfo && OC.isQualifier)
+        continue;
     }
 
     if (!MemberDecl) {
Index: clang/lib/Parse/ParseExpr.cpp
===================================================================
--- clang/lib/Parse/ParseExpr.cpp
+++ clang/lib/Parse/ParseExpr.cpp
@@ -2641,10 +2641,13 @@
 
     // FIXME: This loop leaks the index expressions on error.
     while (true) {
-      if (Tok.is(tok::period)) {
+      if (Tok.is(tok::period) || Tok.is(tok::coloncolon)) {
         // offsetof-member-designator: offsetof-member-designator '.' identifier
+        if (Tok.is(tok::coloncolon))
+          Comps.back().isQualifier = true;
         Comps.push_back(Sema::OffsetOfComponent());
         Comps.back().isBrackets = false;
+        Comps.back().isQualifier = false;
         Comps.back().LocStart = ConsumeToken();
 
         if (Tok.isNot(tok::identifier)) {
@@ -2661,6 +2664,7 @@
         // offsetof-member-designator: offsetof-member-design '[' expression ']'
         Comps.push_back(Sema::OffsetOfComponent());
         Comps.back().isBrackets = true;
+        Comps.back().isQualifier = false;
         BalancedDelimiterTracker ST(*this, tok::l_square);
         ST.consumeOpen();
         Comps.back().LocStart = ST.getOpenLocation();
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -6036,6 +6036,7 @@
   struct OffsetOfComponent {
     SourceLocation LocStart, LocEnd;
     bool isBrackets;  // true if [expr], false if .ident
+    bool isQualifier;
     union {
       IdentifierInfo *IdentInfo;
       Expr *E;


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