[C++20] add Basic consteval specifier
Summary:
this revision adds Lexing, Parsing and Basic Semantic for the consteval specifier as specified by http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1073r3.html
with this patch, the consteval specifier is treated as constexpr but can only be applied to function declaration.
Changes:
- add the consteval keyword.
- add parsing of consteval specifier for normal declarations and lambdas expressions.
- add the whether a declaration is constexpr is now represented by and enum everywhere except for variable because they can't be consteval.
- adapt diagnostic about constexpr to print constexpr or consteval depending on the case.
- add tests for basic semantic.
Reviewers: rsmith, martong, shafik
Reviewed By: rsmith
Subscribers: eraman, efriedma, rnkovacs, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D61790
llvm-svn: 363362
diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index 13d43d5..a413f9a 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -1221,6 +1221,7 @@
/// 'friend'
/// 'typedef'
/// [C++11] 'constexpr'
+/// [C++20] 'consteval'
/// [GNU] attributes declaration-specifiers[opt]
///
/// storage-class-specifier:
@@ -1406,6 +1407,7 @@
case tok::kw_friend:
case tok::kw_typedef:
case tok::kw_constexpr:
+ case tok::kw_consteval:
// storage-class-specifier
case tok::kw_register:
case tok::kw_static: