/* perlvars.h * * 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. * */ /* =head1 Global Variables */ /* 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 * distinct files which are per-thread, per-interpreter or really global, * and how they're initialized. * * The 'G' prefix is only needed for vars that need appropriate #defines * generated in embed*.h. Such symbols are also used to generate * the appropriate export list for win32. */ /* global state */ #if defined(USE_ITHREADS) PERLVAR(G, op_mutex, perl_mutex) /* Mutex for op refcounting */ #endif PERLVAR(G, curinterp, PerlInterpreter *) /* currently running interpreter * (initial parent interpreter under * useithreads) */ #if defined(USE_ITHREADS) PERLVAR(G, thr_key, perl_key) /* key to retrieve per-thread struct */ #endif /* XXX does anyone even use this? */ PERLVARI(G, do_undump, bool, FALSE) /* -u or dump seen? */ #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 */ #endif #ifdef DEBUGGING PERLVAR(G, watch_pvx, char *) #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 /* 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). 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. 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. =cut */ PERLVARI(G, keyword_plugin, Perl_keyword_plugin_t, Perl_keyword_plugin_standard) PERLVAR(G, op_sequence, HV *) /* dump.c */ PERLVARI(G, op_seq, UV, 0) /* dump.c */ #ifdef USE_ITHREADS PERLVAR(G, dollarzero_mutex, perl_mutex) /* Modifying $0 */ #endif /* Restricted hashes placeholder value. * The contents are never used, only the address. */ PERLVAR(G, sv_placeholder, SV) #if defined(MYMALLOC) && defined(USE_ITHREADS) PERLVAR(G, malloc_mutex, perl_mutex) /* Mutex for malloc */ #endif