[PATCH] D156597: [Clang] Handle static_assert messages with an expression started by a literal

[Corentin Jabot via Phabricator via cfe-commits]

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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156597

Files:
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/test/SemaCXX/static-assert-cxx26.cpp


Index: clang/test/SemaCXX/static-assert-cxx26.cpp
===================================================================
--- clang/test/SemaCXX/static-assert-cxx26.cpp
+++ clang/test/SemaCXX/static-assert-cxx26.cpp
@@ -65,6 +65,10 @@
     }
 };
 
+constexpr string_view operator+(auto, string_view S) {
+    return S;
+}
+
 constexpr const char g_[] = "long string";
 
 template <typename T, int S>
@@ -79,6 +83,11 @@
 };
 
 static_assert(false, string_view("test")); // expected-error {{static assertion failed: test}}
+static_assert(false, "Literal" + string_view("test")); // expected-error {{static assertion failed: test}}
+static_assert(false, L"Wide Literal" + string_view("test")); // expected-error {{static assertion failed: test}}
+static_assert(false, "Wild" "Literal" "Concatenation" + string_view("test")); // expected-error {{static assertion failed: test}}
+static_assert(false, "Wild" "Literal" L"Concatenation" + string_view("test")); // expected-error {{static assertion failed: test}}
+static_assert(false, "Wild" u"Literal" L"Concatenation" + string_view("test")); // expected-error {{unsupported non-standard concatenation of string literals}}
 static_assert(false, string_view("😀")); // expected-error {{static assertion failed: 😀}}
 static_assert(false, string_view(0, nullptr)); // expected-error {{static assertion failed:}}
 static_assert(false, string_view(1, "ABC")); // expected-error {{static assertion failed: A}}
Index: clang/lib/Parse/ParseDeclCXX.cpp
===================================================================
--- clang/lib/Parse/ParseDeclCXX.cpp
+++ clang/lib/Parse/ParseDeclCXX.cpp
@@ -1016,10 +1016,23 @@
       return nullptr;
     }
 
-    if (isTokenStringLiteral())
-      AssertMessage = ParseUnevaluatedStringLiteralExpression();
-    else if (getLangOpts().CPlusPlus26)
+    bool ParseAsExression = false;
+    if(getLangOpts().CPlusPlus26) {
+      for(unsigned I = 0; ; ++I) {
+        const Token & T = GetLookAheadToken(I);
+        if(T.is(tok::r_paren))
+          break;
+        if(T.isNot(tok::string_literal)) {
+          ParseAsExression = true;
+          break;
+        }
+      }
+    }
+
+    if(ParseAsExression)
       AssertMessage = ParseConstantExpressionInExprEvalContext();
+    else if (isTokenStringLiteral())
+      AssertMessage = ParseUnevaluatedStringLiteralExpression();
     else {
       Diag(Tok, diag::err_expected_string_literal)
           << /*Source='static_assert'*/ 1;


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