diff options
Diffstat (limited to 'gcc/c-pragma.c')
| -rw-r--r-- | gcc/c-pragma.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c index 563e2d7abdc..0bf2f1231bc 100644 --- a/gcc/c-pragma.c +++ b/gcc/c-pragma.c @@ -566,6 +566,86 @@ maybe_apply_renaming_pragma (tree decl, tree asmname) return 0; } + +#ifdef HANDLE_PRAGMA_VISIBILITY +static void handle_pragma_visibility (cpp_reader *); + +/* Sets the default visibility for symbols to something other than that + specified on the command line. */ +static void +handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED) +{ /* Form is #pragma GCC visibility push(hidden)|pop */ + static int visstack [16], visidx; + tree x; + enum cpp_ttype token; + enum { bad, push, pop } action = bad; + + token = c_lex (&x); + if (token == CPP_NAME) + { + const char *op = IDENTIFIER_POINTER (x); + if (!strcmp (op, "push")) + action = push; + else if (!strcmp (op, "pop")) + action = pop; + } + if (bad == action) + GCC_BAD ("#pragma GCC visibility must be followed by push or pop"); + else + { + if (pop == action) + { + if (!visidx) + { + GCC_BAD ("No matching push for '#pragma GCC visibility pop'"); + } + else + { + default_visibility = visstack[--visidx]; + visibility_options.inpragma = (visidx>0); + } + } + else + { + if (c_lex (&x) != CPP_OPEN_PAREN) + GCC_BAD ("missing '(' after '#pragma GCC visibility push' - ignored"); + token = c_lex (&x); + if (token != CPP_NAME) + { + GCC_BAD ("malformed #pragma GCC visibility push"); + } + else if (visidx >= 16) + { + GCC_BAD ("No more than sixteen #pragma GCC visibility pushes allowed at once"); + } + else + { + const char *str = IDENTIFIER_POINTER (x); + visstack[visidx++] = default_visibility; + if (!strcmp (str, "default")) + default_visibility = VISIBILITY_DEFAULT; + else if (!strcmp (str, "internal")) + default_visibility = VISIBILITY_INTERNAL; + else if (!strcmp (str, "hidden")) + default_visibility = VISIBILITY_HIDDEN; + else if (!strcmp (str, "protected")) + default_visibility = VISIBILITY_PROTECTED; + else + { + GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected"); + } + visibility_options.inpragma = 1; + } + if (c_lex (&x) != CPP_CLOSE_PAREN) + GCC_BAD ("missing '(' after '#pragma GCC visibility push' - ignored"); + } + } + if (c_lex (&x) != CPP_EOF) + warning ("junk at end of '#pragma GCC visibility'"); +} + +#endif + /* Front-end wrapper for pragma registration to avoid dragging cpplib.h in almost everywhere. */ void @@ -585,6 +665,9 @@ init_pragma (void) #ifdef HANDLE_PRAGMA_WEAK c_register_pragma (0, "weak", handle_pragma_weak); #endif +#ifdef HANDLE_PRAGMA_VISIBILITY + c_register_pragma ("GCC", "visibility", handle_pragma_visibility); +#endif c_register_pragma (0, "redefine_extname", handle_pragma_redefine_extname); c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix); |