rZhBoYao updated this revision to Diff 530292.
rZhBoYao added a comment.
Addressed comments.
Thanks for letting me know how to structure tests for DRs.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D152632/new/
https://reviews.llvm.org/D152632
Files:
clang/docs/ReleaseNotes.rst
clang/include/clang/Basic/DiagnosticGroups.td
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaDeclCXX.cpp
clang/lib/Sema/SemaExprCXX.cpp
clang/test/CXX/drs/dr17xx.cpp
clang/test/CXX/drs/dr25xx.cpp
clang/test/CXX/lex/lex.literal/lex.ext/p1.cpp
clang/test/CXX/lex/lex.literal/lex.ext/p10.cpp
clang/test/Parser/cxx0x-literal-operators.cpp
clang/test/SemaCXX/no-warn-user-defined-literals-in-system-headers.cpp
clang/www/cxx_dr_status.html
Index: clang/www/cxx_dr_status.html
===================================================================
--- clang/www/cxx_dr_status.html
+++ clang/www/cxx_dr_status.html
@@ -14933,7 +14933,7 @@
<td><a href="https://cplusplus.github.io/CWG/issues/2521.html";>2521</a></td>
<td>DR</td>
<td>User-defined literals and reserved identifiers</td>
- <td class="none" align="center">Unknown</td>
+ <td class="unreleased" align="center">Clang 17</td>
</tr>
<tr class="open" id="2522">
<td><a href="https://cplusplus.github.io/CWG/issues/2522.html";>2522</a></td>
Index: clang/test/SemaCXX/no-warn-user-defined-literals-in-system-headers.cpp
===================================================================
--- clang/test/SemaCXX/no-warn-user-defined-literals-in-system-headers.cpp
+++ clang/test/SemaCXX/no-warn-user-defined-literals-in-system-headers.cpp
@@ -2,4 +2,4 @@
#include <no-warn-user-defined-literals-in-system-headers.h>
-void operator "" bar(long double); // expected-warning{{user-defined literal suffixes not starting with '_' are reserved}}
+void operator "" bar(long double); // expected-warning{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
Index: clang/test/Parser/cxx0x-literal-operators.cpp
===================================================================
--- clang/test/Parser/cxx0x-literal-operators.cpp
+++ clang/test/Parser/cxx0x-literal-operators.cpp
@@ -3,6 +3,6 @@
void operator "" (const char *); // expected-error {{expected identifier}}
void operator "k" foo(const char *); // \
expected-error {{string literal after 'operator' must be '""'}} \
- expected-warning{{user-defined literal suffixes not starting with '_' are reserved}}
+ expected-warning{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
void operator "" tester (const char *); // \
- expected-warning{{user-defined literal suffixes not starting with '_' are reserved}}
+ expected-warning{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
Index: clang/test/CXX/lex/lex.literal/lex.ext/p10.cpp
===================================================================
--- clang/test/CXX/lex/lex.literal/lex.ext/p10.cpp
+++ clang/test/CXX/lex/lex.literal/lex.ext/p10.cpp
@@ -1,8 +1,8 @@
// RUN: %clang_cc1 -std=c++11 -verify %s
using size_t = decltype(sizeof(int));
-void operator "" wibble(const char *); // expected-warning {{user-defined literal suffixes not starting with '_' are reserved; no literal will invoke this operator}}
-void operator "" wibble(const char *, size_t); // expected-warning {{user-defined literal suffixes not starting with '_' are reserved; no literal will invoke this operator}}
+void operator "" wibble(const char *); // expected-warning {{user-defined literal suffixes containing '__' or not starting with '_' are reserved; no literal will invoke this operator}}
+void operator "" wibble(const char *, size_t); // expected-warning {{user-defined literal suffixes containing '__' or not starting with '_' are reserved; no literal will invoke this operator}}
template<typename T>
void f() {
Index: clang/test/CXX/lex/lex.literal/lex.ext/p1.cpp
===================================================================
--- clang/test/CXX/lex/lex.literal/lex.ext/p1.cpp
+++ clang/test/CXX/lex/lex.literal/lex.ext/p1.cpp
@@ -1,7 +1,7 @@
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
-void operator "" p31(long double); // expected-warning{{user-defined literal suffixes not starting with '_' are reserved}}
+void operator "" p31(long double); // expected-warning{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
void operator "" _p31(long double);
-long double operator "" pi(long double); // expected-warning{{user-defined literal suffixes not starting with '_' are reserved}}
+long double operator "" pi(long double); // expected-warning{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
float hexfloat = 0x1p31; // allow hexfloats
Index: clang/test/CXX/drs/dr25xx.cpp
===================================================================
--- clang/test/CXX/drs/dr25xx.cpp
+++ clang/test/CXX/drs/dr25xx.cpp
@@ -1,4 +1,5 @@
-// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify -Wdeprecated-literal-operator
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify -Wdeprecated
namespace dr2516 { // dr2516: yes
// NB: reusing 1482 test
@@ -108,3 +109,20 @@
// expected-note@-2{{because substituted constraint expression is ill-formed: constraint depends on a previously diagnosed expression}}
}
+
+namespace dr2521 { // dr2521: 17
+
+// expected-warning@+2{{identifier '_Ï___' preceded by space(s) in the literal operator declaration is deprecated}}
+// expected-warning@+1{{user-defined literal suffixes containing '__' or not starting with '_' are reserved}}
+decltype(sizeof 0) operator "" _\u{3C0}___(long double);
+
+template <char... Chars> consteval auto
+operator"" _div() { return (... / (Chars - '0')); }
+// expected-warning@-1{{identifier '_div' preceded by space(s) in the literal operator declaration is deprecated}}
+
+} // namespace dr2521
+
+// expected-warning@+1{{identifier '_Ï___' preceded by space(s) in the literal operator declaration is deprecated}}
+using dr2521::operator"" _\u{3C0}___, dr2521::operator""_div;
+
+[[maybe_unused]] constexpr auto div = 841_div;
Index: clang/test/CXX/drs/dr17xx.cpp
===================================================================
--- clang/test/CXX/drs/dr17xx.cpp
+++ clang/test/CXX/drs/dr17xx.cpp
@@ -127,7 +127,7 @@
#if __cplusplus >= 201103L
float operator ""_E(const char *);
// expected-error@+2 {{invalid suffix on literal; C++11 requires a space between literal and identifier}}
- // expected-warning@+1 {{user-defined literal suffixes not starting with '_' are reserved; no literal will invoke this operator}}
+ // expected-warning@+1 {{user-defined literal suffixes containing '__' or not starting with '_' are reserved; no literal will invoke this operator}}
float operator ""E(const char *);
#endif
}
Index: clang/lib/Sema/SemaExprCXX.cpp
===================================================================
--- clang/lib/Sema/SemaExprCXX.cpp
+++ clang/lib/Sema/SemaExprCXX.cpp
@@ -501,10 +501,16 @@
IdentifierInfo *II = Name.Identifier;
ReservedIdentifierStatus Status = II->isReserved(PP.getLangOpts());
SourceLocation Loc = Name.getEndLoc();
- if (isReservedInAllContexts(Status) &&
- !PP.getSourceManager().isInSystemHeader(Loc)) {
- Diag(Loc, diag::warn_reserved_extern_symbol)
- << II << static_cast<int>(Status)
+ if (!PP.getSourceManager().isInSystemHeader(Loc)) {
+ if (isReservedInAllContexts(Status)) {
+ Diag(Loc, diag::warn_reserved_extern_symbol)
+ << II << static_cast<int>(Status)
+ << FixItHint::CreateReplacement(
+ Name.getSourceRange(),
+ (StringRef("operator\"\"") + II->getName()).str());
+ }
+ Diag(Loc, diag::warn_deprecated_literal_operator_id)
+ << II->getName()
<< FixItHint::CreateReplacement(
Name.getSourceRange(),
(StringRef("operator\"\"") + II->getName()).str());
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -16445,11 +16445,13 @@
StringRef LiteralName
= FnDecl->getDeclName().getCXXLiteralIdentifier()->getName();
- if (LiteralName[0] != '_' &&
+ if ((LiteralName[0] != '_' || LiteralName.contains("__")) &&
!getSourceManager().isInSystemHeader(FnDecl->getLocation())) {
- // C++11 [usrlit.suffix]p1:
- // Literal suffix identifiers that do not start with an underscore
- // are reserved for future standardization.
+ // C++23 [usrlit.suffix]p1:
+ // Literal suffix identifiers that do not start with an underscore are
+ // reserved for future standardization. Literal suffix identifiers that
+ // contain a double underscore __ are reserved for use by C++
+ // implementations.
Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved)
<< StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName);
}
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -406,6 +406,9 @@
"it starts with '_' followed by a capital letter|"
"it contains '__'}1">,
InGroup<ReservedIdentifier>, DefaultIgnore;
+def warn_deprecated_literal_operator_id: Warning<
+ "identifier '%0' preceded by space(s) in the literal operator declaration "
+ "is deprecated">, InGroup<DeprecatedLiteralOperator>, DefaultIgnore;
def warn_reserved_module_name : Warning<
"%0 is a reserved name for a module">, InGroup<ReservedModuleIdentifier>;
@@ -9263,7 +9266,7 @@
"string literal operator templates are a GNU extension">,
InGroup<GNUStringLiteralOperatorTemplate>;
def warn_user_literal_reserved : Warning<
- "user-defined literal suffixes not starting with '_' are reserved"
+ "user-defined literal suffixes containing '__' or not starting with '_' are reserved"
"%select{; no literal will invoke this operator|}0">,
InGroup<UserDefinedLiterals>;
Index: clang/include/clang/Basic/DiagnosticGroups.td
===================================================================
--- clang/include/clang/Basic/DiagnosticGroups.td
+++ clang/include/clang/Basic/DiagnosticGroups.td
@@ -183,6 +183,7 @@
def DeprecatedCopyWithUserProvidedDtor : DiagGroup<"deprecated-copy-with-user-provided-dtor">;
def DeprecatedCopy : DiagGroup<"deprecated-copy", [DeprecatedCopyWithUserProvidedCopy]>;
def DeprecatedCopyWithDtor : DiagGroup<"deprecated-copy-with-dtor", [DeprecatedCopyWithUserProvidedDtor]>;
+def DeprecatedLiteralOperator : DiagGroup<"deprecated-literal-operator">;
// For compatibility with GCC.
def : DiagGroup<"deprecated-copy-dtor", [DeprecatedCopyWithDtor]>;
def DeprecatedDeclarations : DiagGroup<"deprecated-declarations">;
@@ -219,6 +220,7 @@
DeprecatedEnumFloatConversion,
DeprecatedBuiltins,
DeprecatedIncrementBool,
+ DeprecatedLiteralOperator,
DeprecatedPragma,
DeprecatedRegister,
DeprecatedThisCapture,
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -136,6 +136,22 @@
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Implemented `DR2397 <https://wg21.link/CWG2397>`_ which allows ``auto`` specifier for pointers
and reference to arrays.
+- Implemented `CWG2521 <https://wg21.link/CWG2521>`_ which reserves using ``__`` in user defined literal suffixes
+ for C++ implementations, and deprecates literal operator function declarations using an identifier.
+ Taught ``-Wuser-defined-literals`` for the former, on by default, and added ``-Wdeprecated-literal-operator``
+ for the latter, off by default.
+
+ .. code-block:: c++
+
+ // What follows is warned by -Wuser-defined-literals
+ // albeit "ill-formed, no diagnostic required".
+ // Its behavior is undefined, [reserved.names.general]p2.
+ string operator ""__i18n(const char*, std::size_t);
+
+ // Let's assume this is not in the global namespace.
+ // -Wdeprecated-literal-operator whines about extra spaces.
+ string operator "" _i18n(const char*, std::size_t);
+ // ^ an extra space
C Language Changes
------------------
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