From 5989450e0061dce8cff89d8acfdd5225c14cd065 Mon Sep 17 00:00:00 2001 From: The Phantom Derpstorm Date: Wed, 12 Jun 2024 03:16:02 -0400 Subject: [clang][Sema, Lex, Parse] Preprocessor embed in C and C++ (and Obj-C and Obj-C++ by-proxy) (#68620) This commit implements the entirety of the now-accepted [N3017 - Preprocessor Embed](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3017.htm) and its sister C++ paper [p1967](https://wg21.link/p1967). It implements everything in the specification, and includes an implementation that drastically improves the time it takes to embed data in specific scenarios (the initialization of character type arrays). The mechanisms used to do this are used under the "as-if" rule, and in general when the system cannot detect it is initializing an array object in a variable declaration, will generate EmbedExpr AST node which will be expanded by AST consumers (CodeGen or constant expression evaluators) or expand embed directive as a comma expression. --------- Co-authored-by: Aaron Ballman Co-authored-by: cor3ntin Co-authored-by: H. Vetinari Co-authored-by: Podchishchaeva, Mariya --- clang/lib/Basic/IdentifierTable.cpp | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'clang/lib/Basic/IdentifierTable.cpp') diff --git a/clang/lib/Basic/IdentifierTable.cpp b/clang/lib/Basic/IdentifierTable.cpp index feea845..04cc9c7 100644 --- a/clang/lib/Basic/IdentifierTable.cpp +++ b/clang/lib/Basic/IdentifierTable.cpp @@ -425,8 +425,8 @@ tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { // collisions (if there were, the switch below would complain about duplicate // case values). Note that this depends on 'if' being null terminated. -#define HASH(LEN, FIRST, THIRD) \ - (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) +#define HASH(LEN, FIRST, THIRD) \ + (LEN << 6) + (((FIRST - 'a') - (THIRD - 'a')) & 63) #define CASE(LEN, FIRST, THIRD, NAME) \ case HASH(LEN, FIRST, THIRD): \ return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME @@ -441,6 +441,7 @@ tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { CASE( 4, 'e', 's', else); CASE( 4, 'l', 'n', line); CASE( 4, 's', 'c', sccs); + CASE(5, 'e', 'b', embed); CASE( 5, 'e', 'd', endif); CASE( 5, 'e', 'r', error); CASE( 5, 'i', 'e', ident); -- cgit v1.1