X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/3f774658ecc4b04691265c9db31d70a4a611b290..49d7d366441813aa7301b1a437e302372f04f31a:/perlvars.h diff --git a/perlvars.h b/perlvars.h index 0495f1a..be67a59 100644 --- a/perlvars.h +++ b/perlvars.h @@ -1,17 +1,28 @@ /* perlvars.h * - * Copyright (c) 1997-2002, Larry Wall + * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, + * by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * */ -/****************/ -/* Truly global */ -/****************/ +/* +=head1 Global Variables +These variables are global to an entire process. They are shared between +all interpreters and all threads in a process. Any variables not documented +here may be changed or removed without notice, so don't use them! +If you feel you really do need to use an unlisted variable, first send email to +L. It may be that +someone there will point out a way to accomplish what you need without using an +internal variable. But if not, you should get a go-ahead to document and then +use the variable. -/* Don't forget to re-run embed.pl to propagate changes! */ +=cut +*/ + +/* Don't forget to re-run regen/embed.pl to propagate changes! */ /* This file describes the "global" variables used by perl * This used to be in perl.h directly but we want to abstract out into @@ -23,46 +34,241 @@ * the appropriate export list for win32. */ /* global state */ -PERLVAR(Gcurinterp, PerlInterpreter *) +#if defined(USE_ITHREADS) +PERLVAR(G, op_mutex, perl_mutex) /* Mutex for op refcounting */ +#endif +PERLVARI(G, curinterp, PerlInterpreter *, NULL) /* currently running interpreter * (initial parent interpreter under * useithreads) */ #if defined(USE_ITHREADS) -PERLVAR(Gthr_key, perl_key) /* key to retrieve per-thread struct */ +PERLVAR(G, thr_key, perl_key) /* key to retrieve per-thread struct */ #endif -/* constants (these are not literals to facilitate pointer comparisons) */ -PERLVARIC(GYes, char *, "1") -PERLVARIC(GNo, char *, "") -PERLVARIC(Ghexdigit, char *, "0123456789abcdef0123456789ABCDEF") -PERLVARIC(Gpatleave, char *, "\\.^$@dDwWsSbB+*?|()-nrtfeaxc0123456789[{]}") - /* XXX does anyone even use this? */ -PERLVARI(Gdo_undump, bool, FALSE) /* -u or dump seen? */ +PERLVARI(G, do_undump, bool, FALSE) /* -u or dump seen? */ -#if defined(MYMALLOC) && defined(USE_ITHREADS) -PERLVAR(Gmalloc_mutex, perl_mutex) /* Mutex for malloc */ +#ifndef PERL_USE_SAFE_PUTENV +PERLVARI(G, use_safe_putenv, bool, TRUE) +#endif + +#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS)||defined(FAKE_DEFAULT_SIGNAL_HANDLERS) +PERLVARI(G, sig_handlers_initted, int, 0) +#endif +#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS +PERLVARA(G, sig_ignoring, SIG_SIZE, int) + /* which signals we are ignoring */ +#endif +#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS +PERLVARA(G, sig_defaulting, SIG_SIZE, int) +#endif + +/* XXX signals are process-wide anyway, so we + * ignore the implications of this for threading */ +#ifndef HAS_SIGACTION +PERLVARI(G, sig_trapped, int, 0) +#endif + +#ifndef PERL_MICRO +/* If Perl has to ignore SIGPFE, this is its saved state. + * See perl.h macros PERL_FPU_INIT and PERL_FPU_{PRE,POST}_EXEC. */ +PERLVAR(G, sigfpe_saved, Sighandler_t) +PERLVARI(G, csighandlerp, Sighandler_t, Perl_csighandler) + /* Pointer to C-level sighandler */ +#endif + +/* This is constant on most architectures, a global on OS/2 */ +#ifdef OS2 +PERLVARI(G, sh_path, char *, SH_PATH) /* full path of shell */ +#endif + +#ifdef USE_PERLIO + +# if defined(USE_ITHREADS) +PERLVAR(G, perlio_mutex, perl_mutex) /* Mutex for perlio fd refcounts */ +# endif + +PERLVARI(G, perlio_fd_refcnt, int *, 0) /* Pointer to array of fd refcounts. */ +PERLVARI(G, perlio_fd_refcnt_size, int, 0) /* Size of the array */ +PERLVARI(G, perlio_debug_fd, int, 0) /* the fd to write perlio debug into, 0 means not set yet */ +#endif + +#ifdef HAS_MMAP +PERLVARI(G, mmap_page_size, IV, 0) +#endif + +#if defined(USE_ITHREADS) +PERLVAR(G, hints_mutex, perl_mutex) /* Mutex for refcounted he refcounting */ +PERLVAR(G, locale_mutex, perl_mutex) /* Mutex for setlocale() changing */ +PERLVAR(G, lc_numeric_mutex, perl_mutex) /* Mutex for switching LC_NUMERIC */ + +#endif + +/* Proxy for HAS_POSIX_2008_LOCALE, since that is not defined in time for this */ +#if defined(HAS_NEWLOCALE) \ + && defined(HAS_FREELOCALE) \ + && defined(HAS_USELOCALE) \ + && ! defined(NO_POSIX_2008_LOCALE) +PERLVAR(G, C_locale_obj, locale_t) +#endif + +#ifdef DEBUGGING +PERLVARI(G, watch_pvx, char *, NULL) #endif +/* +=for apidoc AmU|Perl_check_t *|PL_check + +Array, indexed by opcode, of functions that will be called for the "check" +phase of optree building during compilation of Perl code. For most (but +not all) types of op, once the op has been initially built and populated +with child ops it will be filtered through the check function referenced +by the appropriate element of this array. The new op is passed in as the +sole argument to the check function, and the check function returns the +completed op. The check function may (as the name suggests) check the op +for validity and signal errors. It may also initialise or modify parts of +the ops, or perform more radical surgery such as adding or removing child +ops, or even throw the op away and return a different op in its place. + +This array of function pointers is a convenient place to hook into the +compilation process. An XS module can put its own custom check function +in place of any of the standard ones, to influence the compilation of a +particular type of op. However, a custom check function must never fully +replace a standard check function (or even a custom check function from +another module). A module modifying checking must instead B the +preexisting check function. A custom check function must be selective +about when to apply its custom behaviour. In the usual case where +it decides not to do anything special with an op, it must chain the +preexisting op function. Check functions are thus linked in a chain, +with the core's base checker at the end. + +For thread safety, modules should not write directly to this array. +Instead, use the function L. + +=cut +*/ + #if defined(USE_ITHREADS) -PERLVAR(Gop_mutex, perl_mutex) /* Mutex for op refcounting */ +PERLVAR(G, check_mutex, perl_mutex) /* Mutex for PL_check */ +#endif +#ifdef PERL_GLOBAL_STRUCT +PERLVAR(G, ppaddr, Perl_ppaddr_t *) /* or opcode.h */ +PERLVAR(G, check, Perl_check_t *) /* or opcode.h */ +PERLVARA(G, fold_locale, 256, unsigned char) /* or perl.h */ +#endif + +#ifdef PERL_NEED_APPCTX +PERLVAR(G, appctx, void*) /* the application context */ +#endif + +#if defined(HAS_TIMES) && defined(PERL_NEED_TIMESBASE) +PERLVAR(G, timesbase, struct tms) +#endif + +/* allocate a unique index to every module that calls MY_CXT_INIT */ + +#ifdef PERL_IMPLICIT_CONTEXT +# ifdef USE_ITHREADS +PERLVAR(G, my_ctx_mutex, perl_mutex) +# endif +PERLVARI(G, my_cxt_index, int, 0) #endif -/* Force inclusion of both runops options */ -PERLVARI(Grunops_std, runops_proc_t, MEMBER_TO_FPTR(Perl_runops_standard)) -PERLVARI(Grunops_dbg, runops_proc_t, MEMBER_TO_FPTR(Perl_runops_debug)) +/* this is currently set without MUTEX protection, so keep it a type which + * can be set atomically (ie not a bit field) */ +PERLVARI(G, veto_cleanup, int, FALSE) /* exit without cleanup */ + +/* +=for apidoc AmUx|Perl_keyword_plugin_t|PL_keyword_plugin + +Function pointer, pointing at a function used to handle extended keywords. +The function should be declared as + + int keyword_plugin_function(pTHX_ + char *keyword_ptr, STRLEN keyword_len, + OP **op_ptr) + +The function is called from the tokeniser, whenever a possible keyword +is seen. C points at the word in the parser's input +buffer, and C gives its length; it is not null-terminated. +The function is expected to examine the word, and possibly other state +such as L<%^H|perlvar/%^H>, to decide whether it wants to handle it +as an extended keyword. If it does not, the function should return +C, and the normal parser process will continue. + +If the function wants to handle the keyword, it first must +parse anything following the keyword that is part of the syntax +introduced by the keyword. See L for details. + +When a keyword is being handled, the plugin function must build +a tree of C structures, representing the code that was parsed. +The root of the tree must be stored in C<*op_ptr>. The function then +returns a constant indicating the syntactic role of the construct that +it has parsed: C if it is a complete statement, or +C if it is an expression. Note that a statement +construct cannot be used inside an expression (except via C +and similar), and an expression is not a complete statement (it requires +at least a terminating semicolon). -/* Hooks to shared SVs and locks. */ -PERLVARI(Gsharehook, share_proc_t, MEMBER_TO_FPTR(Perl_sv_nosharing)) -PERLVARI(Glockhook, share_proc_t, MEMBER_TO_FPTR(Perl_sv_nolocking)) -PERLVARI(Gunlockhook, share_proc_t, MEMBER_TO_FPTR(Perl_sv_nounlocking)) -PERLVARI(Gthreadhook, thrhook_proc_t, MEMBER_TO_FPTR(Perl_nothreadhook)) +When a keyword is handled, the plugin function may also have +(compile-time) side effects. It may modify C<%^H>, define functions, and +so on. Typically, if side effects are the main purpose of a handler, +it does not wish to generate any ops to be included in the normal +compilation. In this case it is still required to supply an op tree, +but it suffices to generate a single null op. -/* Stores the PPID */ -#ifdef THREADS_HAVE_PIDS -PERLVARI(Gppid, IV, 0) +That's how the C<*PL_keyword_plugin> function needs to behave overall. +Conventionally, however, one does not completely replace the existing +handler function. Instead, take a copy of C before +assigning your own function pointer to it. Your handler function should +look for keywords that it is interested in and handle those. Where it +is not interested, it should call the saved plugin function, passing on +the arguments it received. Thus C actually points +at a chain of handler functions, all of which have an opportunity to +handle keywords, and only the last function in the chain (built into +the Perl core) will normally return C. + +For thread safety, modules should not set this variable directly. +Instead, use the function L. + +=cut +*/ + +#if defined(USE_ITHREADS) +PERLVAR(G, keyword_plugin_mutex, perl_mutex) /* Mutex for PL_keyword_plugin */ #endif +PERLVARI(G, keyword_plugin, Perl_keyword_plugin_t, Perl_keyword_plugin_standard) + +PERLVARI(G, op_sequence, HV *, NULL) /* dump.c */ +PERLVARI(G, op_seq, UV, 0) /* dump.c */ #ifdef USE_ITHREADS -PERLVAR(Gdollarzero_mutex, perl_mutex) /* Modifying $0 */ +PERLVAR(G, dollarzero_mutex, perl_mutex) /* Modifying $0 */ +#endif + +/* Restricted hashes placeholder value. + In theory, the contents are never used, only the address. + In practice, &PL_sv_placeholder is returned by some APIs, and the calling + code is checking SvOK(). */ + +PERLVAR(G, sv_placeholder, SV) + +#if defined(MYMALLOC) && defined(USE_ITHREADS) +PERLVAR(G, malloc_mutex, perl_mutex) /* Mutex for malloc */ +#endif + +PERLVARI(G, hash_seed_set, bool, FALSE) /* perl.c */ +PERLVARA(G, hash_seed, PERL_HASH_SEED_BYTES, unsigned char) /* perl.c and hv.h */ +#if defined(PERL_HASH_STATE_BYTES) +PERLVARA(G, hash_state, PERL_HASH_STATE_BYTES, unsigned char) /* perl.c and hv.h */ +#endif +#if defined(PERL_USE_SINGLE_CHAR_HASH_CACHE) +PERLVARA(G, hash_chars, (1+256) * sizeof(U32), unsigned char) /* perl.c and hv.h */ +#endif + +/* The path separator can vary depending on whether we're running under DCL or + * a Unix shell. + */ +#ifdef __VMS +PERLVAR(G, perllib_sep, char) #endif