[PATCH] D58896: Suppress -Wchar-subscripts if the index is a literal char

[Edward Jones via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG7adab7719e55: [Sema] Suppress -Wchar-subscripts if the index is a literal char (authored by edward-jones).
Herald added a subscriber: simoncook.

Changed prior to commit:
  https://reviews.llvm.org/D58896?vs=189127&id=228249#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58896/new/

https://reviews.llvm.org/D58896

Files:
  clang/lib/Sema/SemaExpr.cpp
  clang/test/SemaCXX/warn-char-subscripts.cpp


Index: clang/test/SemaCXX/warn-char-subscripts.cpp
===================================================================
--- clang/test/SemaCXX/warn-char-subscripts.cpp
+++ clang/test/SemaCXX/warn-char-subscripts.cpp
@@ -14,6 +14,19 @@
   int val = subscript[array]; // expected-warning{{array subscript is of type 'char'}}
 }
 
+void t3() {
+  int array[50] = { 0 };
+  int val = array[' ']; // no warning, subscript is a literal
+}
+void t4() {
+  int array[50] = { 0 };
+  int val = '('[array]; // no warning, subscript is a literal
+}
+void t5() {
+  int array[50] = { 0 };
+  int val = array['\x11']; // no warning, subscript is a literal
+}
+
 void test() {
   t1<char>(); // expected-note {{in instantiation of function template specialization 't1<char>' requested here}}
   t2<char>(); // expected-note {{in instantiation of function template specialization 't2<char>' requested here}}
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -4741,7 +4741,8 @@
 
   if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
        IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
-         && !IndexExpr->isTypeDependent())
+         && !IndexExpr->isTypeDependent()
+         && !isa<CharacterLiteral>(IndexExpr))
     Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
 
   // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,


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