[PATCH] D105759: [WIP] Implement P2361 Unevaluated string literals

[Corentin Jabot via Phabricator via cfe-commits]

cor3ntin created this revision.
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This patch proposes to handle in an uniform fashion
the parsing of strings that are never evaluated,
in asm statement, static assert, attrributes, extern,
etc.

Unevaluated strings are UTF-8 internally and so currently
behave as narrow strings, but these things will diverge with
D93031 <https://reviews.llvm.org/D93031>.

The big question both for this patch and the P2361 <https://reviews.llvm.org/P2361> paper
is whether we risk breaking code by disallowing
encoding prefixes in this context.
I hope this patch may allow to gather some data on that.

Future work:
Improve the rendering of unicode characters, line break
and so forth in static-assert messages


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105759

Files:
  clang/include/clang/AST/Expr.h
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/include/clang/Lex/LiteralSupport.h
  clang/include/clang/Parse/Parser.h
  clang/include/clang/Sema/Sema.h
  clang/lib/AST/Expr.cpp
  clang/lib/Frontend/FrontendAction.cpp
  clang/lib/Lex/LiteralSupport.cpp
  clang/lib/Lex/PPDirectives.cpp
  clang/lib/Lex/PPMacroExpansion.cpp
  clang/lib/Lex/Pragma.cpp
  clang/lib/Parse/ParseDecl.cpp
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/lib/Parse/ParseExpr.cpp
  clang/lib/Parse/Parser.cpp
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/lib/Sema/SemaExpr.cpp
  clang/lib/Sema/SemaExprCXX.cpp
  clang/lib/Sema/SemaInit.cpp
  clang/lib/Sema/SemaStmtAsm.cpp
  clang/test/CXX/dcl.dcl/dcl.link/p2.cpp
  clang/test/CXX/dcl.dcl/p4-0x.cpp
  clang/test/FixIt/fixit-static-assert.cpp
  clang/test/Parser/asm.c
  clang/test/Parser/asm.cpp
  clang/test/Parser/attr-availability.c
  clang/test/Sema/asm.c
  clang/test/SemaCXX/static-assert.cpp

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