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perl.h
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perl.h
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/* perl.h
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
* 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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.
*
*/
#ifndef H_PERL
#define H_PERL 1
#if defined(__HP_cc) || defined(__HP_aCC)
/* The HPUX compiler for Itanium is very picky and warns about
* things that gcc doesn't and that we would prefer it does not.
* So on that platform silence certain warnings unlaterally. */
/* silence "relational operator ">" always evaluates to 'false'"
* warnings. We get a LOT of these from the memwrap checks. */
#pragma diag_suppress 4276
/* silence "may cause misaligned access" warnings from our "OO in C"
* type logic. we do this a lot and if it was broken we would fail tests
* all over the place */
#pragma diag_suppress 4232
#endif /* end HPUX warning disablement */
#ifdef PERL_FOR_X2P
/*
* This file is being used for x2p stuff.
* Above symbol is defined via -D in 'x2p/Makefile.SH'
* Decouple x2p stuff from some of perls more extreme eccentricities.
*/
#undef MULTIPLICITY
#undef USE_STDIO
#define USE_STDIO
#endif /* PERL_FOR_X2P */
/* Treat the SVs on the argument stack as having been reference counted.
* (Experimental).
*/
/* #define PERL_RC_STACK */
#include "config.h"
#ifndef WIN32 /* XXX temp */
# define _configthreadlocale(x) (! cBOOL(x))
# define _DISABLE_PER_THREAD_LOCALE 0
# define _ENABLE_PER_THREAD_LOCALE 1
#endif
/* This fakes up using Mingw for locale handling. In order to not define WIN32
* in this file (and hence throughout the code that isn't expecting it), this
* doesn't define that, but defines the appropriate things that would otherwise
* be defined later in the file. Hence those and here must be kept in sync */
#ifdef WIN32_USE_FAKE_OLD_MINGW_LOCALES
# define UINT unsigned int
# undef USE_THREAD_SAFE_LOCALE
# define NO_POSIX_2008_LOCALE
# undef HAS_NL_LANGINFO
# undef HAS_NL_LANGINFO_L
# undef _UCRT
# ifdef USE_LOCALE
# define TS_W32_BROKEN_LOCALECONV
# ifdef USE_THREADS
# define EMULATE_THREAD_SAFE_LOCALES
# endif
# endif
#endif
/*
=for apidoc_section $debugging
=for apidoc CmnW ||comma_aDEPTH
Some functions when compiled under DEBUGGING take an extra final argument named
C<depth>, indicating the C stack depth. This argument is omitted otherwise.
This macro expands to either S<C<, depth>> under DEBUGGING, or to nothing at
all when not under DEBUGGING, reducing the number of C<#ifdef>'s in the code.
The program is responsible for maintaining the correct value for C<depth>.
=for apidoc CyW ||comma_pDEPTH
This is used in the prototype declarations for functions that take a L</C<comma_aDEPTH>>
final parameter, much like L<C<pTHX_>|perlguts/Background and MULTIPLICITY>
is used in functions that take a thread context initial parameter.
=for apidoc CmnW ||debug_aDEPTH
Same as L</C<comma_aDEPTH>> but with no leading argument. Intended for functions with
no normal arguments, and used by L</C<comma_aDEPTH>> itself.
=for apidoc CmnW ||debug_pDEPTH
Same as L</C<comma_pDEPTH>> but with no leading argument. Intended for functions with
no normal arguments, and used by L</C<comma_pDEPTH>> itself.
=cut
*/
#ifdef DEBUGGING
# define debug_pDEPTH U32 depth
# define comma_pDEPTH ,debug_pDEPTH
# define debug_aDEPTH depth
# define comma_aDEPTH ,debug_aDEPTH
#else
# define debug_aDEPTH
# define comma_aDEPTH
# define debug_pDEPTH
# define comma_pDEPTH
#endif
/* NOTE 1: that with gcc -std=c89 the __STDC_VERSION__ is *not* defined
* because the __STDC_VERSION__ became a thing only with C90. Therefore,
* with gcc, HAS_C99 will never become true as long as we use -std=c89.
* NOTE 2: headers lie. Do not expect that if HAS_C99 gets to be true,
* all the C99 features are there and are correct. */
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
defined(_STDC_C99) || defined(__c99)
# define HAS_C99 1
#endif
/* =========================================================================
* The defines from here to the following ===== line are unfortunately
* duplicated in makedef.pl, and changes here MUST also be made there */
/* See L<perlguts/"The Perl API"> for detailed notes on
* MULTIPLICITY and PERL_IMPLICIT_SYS */
#ifdef USE_ITHREADS
# if !defined(MULTIPLICITY)
# define MULTIPLICITY
# endif
#endif
/* PERL_IMPLICIT_CONTEXT is a legacy synonym for MULTIPLICITY */
#if defined(MULTIPLICITY) \
&& ! defined(PERL_CORE) \
&& ! defined(PERL_IMPLICIT_CONTEXT)
# define PERL_IMPLICIT_CONTEXT
#endif
#if defined(PERL_IMPLICIT_CONTEXT) && !defined(MULTIPLICITY)
# define MULTIPLICITY
#endif
#if defined(PERL_CORE) && defined(PERL_IMPLICIT_CONTEXT)
# pragma message("PERL_IMPLICIT_CONTEXT was removed from core perl. It does not do anything. Undeffing it for compilation")
# undef PERL_IMPLICIT_CONTEXT
#endif
/* undef WIN32 when building on Cygwin (for libwin32) - gph */
#ifdef __CYGWIN__
# undef WIN32
# undef _WIN32
#endif
/* Use the reentrant APIs like localtime_r and getpwent_r */
/* Win32 has naturally threadsafe libraries, no need to use any _r variants.
* XXX KEEP makedef.pl copy of this code in sync */
#if defined(USE_ITHREADS) && !defined(USE_REENTRANT_API) && !defined(WIN32)
# define USE_REENTRANT_API
#endif
/* end of makedef.pl logic duplication. But there are other groups below.
* ========================================================================= */
/*
=for apidoc_section $directives
=for apidoc AmnUu|void|EXTERN_C
When not compiling using C++, expands to nothing.
Otherwise is used in a declaration of a function to indicate the function
should have external C linkage. This is required for things to work for just
about all functions with external linkage compiled into perl.
Often, you can use C<L</START_EXTERN_C>> ... C<L</END_EXTERN_C>> blocks
surrounding all your code that you need to have this linkage.
Example usage:
EXTERN_C int flock(int fd, int op);
=for apidoc Amnu||START_EXTERN_C
When not compiling using C++, expands to nothing.
Otherwise begins a section of code in which every function will effectively
have C<L</EXTERN_C>> applied to it, that is to have external C linkage. The
section is ended by a C<L</END_EXTERN_C>>.
=for apidoc Amnu||END_EXTERN_C
When not compiling using C++, expands to nothing.
Otherwise ends a section of code already begun by a C<L</START_EXTERN_C>>.
=cut
*/
#undef START_EXTERN_C
#undef END_EXTERN_C
#undef EXTERN_C
#ifdef __cplusplus
# define EXTERN_C extern "C"
# define START_EXTERN_C EXTERN_C {
# define END_EXTERN_C }
#else
# define START_EXTERN_C
# define END_EXTERN_C
# define EXTERN_C extern
#endif
/* Fallback definitions in case we don't have definitions from config.h.
This should only matter for systems that don't use Configure and
haven't been modified to define PERL_STATIC_INLINE yet.
*/
#if !defined(PERL_STATIC_INLINE)
# ifdef HAS_STATIC_INLINE
# define PERL_STATIC_INLINE static inline
# else
# define PERL_STATIC_INLINE static
# endif
#endif
/*
=for apidoc_section $concurrency
=for apidoc AmU|void|dTHXa|PerlInterpreter * a
On threaded perls, set C<pTHX> to C<a>; on unthreaded perls, do nothing
=for apidoc AmU|void|dTHXoa|PerlInterpreter * a
Now a synonym for C<L</dTHXa>>.
=cut
*/
#ifdef MULTIPLICITY
# define tTHX PerlInterpreter*
# define pTHX tTHX my_perl PERL_UNUSED_DECL
# define aTHX my_perl
# define aTHXa(a) aTHX = (tTHX)a
# define dTHXa(a) pTHX = (tTHX)a
# define dTHX pTHX = PERL_GET_THX
# define pTHX_ pTHX,
# define aTHX_ aTHX,
# define pTHX_1 2
# define pTHX_2 3
# define pTHX_3 4
# define pTHX_4 5
# define pTHX_5 6
# define pTHX_6 7
# define pTHX_7 8
# define pTHX_8 9
# define pTHX_9 10
# define pTHX_12 13
# if defined(DEBUGGING) && !defined(PERL_TRACK_MEMPOOL)
# define PERL_TRACK_MEMPOOL
# endif
#else
# undef PERL_TRACK_MEMPOOL
#endif
#ifdef DEBUGGING
# define dTHX_DEBUGGING dTHX
#else
# define dTHX_DEBUGGING dNOOP
#endif
#define STATIC static
#ifndef PERL_CORE
/* Do not use these macros. They were part of PERL_OBJECT, which was an
* implementation of multiplicity using C++ objects. They have been left
* here solely for the sake of XS code which has incorrectly
* cargo-culted them.
*
* The only one Devel::PPPort handles is this; list it as deprecated
=for apidoc_section $concurrency
=for apidoc AmD|void|CPERLscope|void x
Now a no-op.
=cut
*/
# define CPERLscope(x) x
# define CPERLarg void
# define CPERLarg_
# define _CPERLarg
# define PERL_OBJECT_THIS
# define _PERL_OBJECT_THIS
# define PERL_OBJECT_THIS_
# define CALL_FPTR(fptr) (*fptr)
# define MEMBER_TO_FPTR(name) name
#endif /* !PERL_CORE */
#ifdef PERL_RC_STACK
# define CALLRUNOPS Perl_runops_wrap
#else
# define CALLRUNOPS PL_runops
#endif
#define CALLREGCOMP(sv, flags) Perl_pregcomp(aTHX_ (sv),(flags))
#define CALLREGCOMP_ENG(prog, sv, flags) (prog)->comp(aTHX_ sv, flags)
#define CALLREGEXEC(prog,stringarg,strend,strbeg,minend,sv,data,flags) \
RX_ENGINE(prog)->exec(aTHX_ (prog),(stringarg),(strend), \
(strbeg),(minend),(sv),(data),(flags))
#define CALLREG_INTUIT_START(prog,sv,strbeg,strpos,strend,flags,data) \
RX_ENGINE(prog)->intuit(aTHX_ (prog), (sv), (strbeg), (strpos), \
(strend),(flags),(data))
#define CALLREG_INTUIT_STRING(prog) \
RX_ENGINE(prog)->checkstr(aTHX_ (prog))
#define CALLREGFREE(prog) \
Perl_pregfree(aTHX_ (prog))
#define CALLREGFREE_PVT(prog) \
if(prog && RX_ENGINE(prog)) RX_ENGINE(prog)->rxfree(aTHX_ (prog))
#define CALLREG_NUMBUF_FETCH(rx,paren,usesv) \
RX_ENGINE(rx)->numbered_buff_FETCH(aTHX_ (rx),(paren),(usesv))
#define CALLREG_NUMBUF_STORE(rx,paren,value) \
RX_ENGINE(rx)->numbered_buff_STORE(aTHX_ (rx),(paren),(value))
#define CALLREG_NUMBUF_LENGTH(rx,sv,paren) \
RX_ENGINE(rx)->numbered_buff_LENGTH(aTHX_ (rx),(sv),(paren))
#define CALLREG_NAMED_BUFF_FETCH(rx, key, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), (key), NULL, ((flags) | RXapif_FETCH))
#define CALLREG_NAMED_BUFF_STORE(rx, key, value, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), (key), (value), ((flags) | RXapif_STORE))
#define CALLREG_NAMED_BUFF_DELETE(rx, key, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx),(key), NULL, ((flags) | RXapif_DELETE))
#define CALLREG_NAMED_BUFF_CLEAR(rx, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), NULL, NULL, ((flags) | RXapif_CLEAR))
#define CALLREG_NAMED_BUFF_EXISTS(rx, key, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), (key), NULL, ((flags) | RXapif_EXISTS))
#define CALLREG_NAMED_BUFF_FIRSTKEY(rx, flags) \
RX_ENGINE(rx)->named_buff_iter(aTHX_ (rx), NULL, ((flags) | RXapif_FIRSTKEY))
#define CALLREG_NAMED_BUFF_NEXTKEY(rx, lastkey, flags) \
RX_ENGINE(rx)->named_buff_iter(aTHX_ (rx), (lastkey), ((flags) | RXapif_NEXTKEY))
#define CALLREG_NAMED_BUFF_SCALAR(rx, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), NULL, NULL, ((flags) | RXapif_SCALAR))
#define CALLREG_NAMED_BUFF_COUNT(rx) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), NULL, NULL, RXapif_REGNAMES_COUNT)
#define CALLREG_NAMED_BUFF_ALL(rx, flags) \
RX_ENGINE(rx)->named_buff(aTHX_ (rx), NULL, NULL, flags)
#define CALLREG_PACKAGE(rx) \
RX_ENGINE(rx)->qr_package(aTHX_ (rx))
#if defined(USE_ITHREADS)
# define CALLREGDUPE(prog,param) \
Perl_re_dup(aTHX_ (prog),(param))
# define CALLREGDUPE_PVT(prog,param) \
(prog ? RX_ENGINE(prog)->dupe(aTHX_ (prog),(param)) \
: (REGEXP *)NULL)
#endif
/* some compilers impersonate gcc */
#if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
# define PERL_IS_GCC 1
#endif
#define PERL_GCC_VERSION_GE(major,minor,patch) \
(((100000 * __GNUC__) + (1000 * __GNUC_MINOR__) + __GNUC_PATCHLEVEL__) \
>= ((100000 * (major)) + (1000 * (minor)) + (patch)))
#define PERL_GCC_VERSION_GT(major,minor,patch) \
(((100000 * __GNUC__) + (1000 * __GNUC_MINOR__) + __GNUC_PATCHLEVEL__) \
> ((100000 * (major)) + (1000 * (minor)) + (patch)))
#define PERL_GCC_VERSION_LE(major,minor,patch) \
(((100000 * __GNUC__) + (1000 * __GNUC_MINOR__) + __GNUC_PATCHLEVEL__) \
<= ((100000 * (major)) + (1000 * (minor)) + (patch)))
#define PERL_GCC_VERSION_LT(major,minor,patch) \
(((100000 * __GNUC__) + (1000 * __GNUC_MINOR__) + __GNUC_PATCHLEVEL__) \
< ((100000 * (major)) + (1000 * (minor)) + (patch)))
/* In case Configure was not used (we are using a "canned config"
* such as Win32, or a cross-compilation setup, for example) try going
* by the gcc major and minor versions. One useful URL is
* http://www.ohse.de/uwe/articles/gcc-attributes.html,
* but contrary to this information warn_unused_result seems
* not to be in gcc 3.3.5, at least. --jhi
* Also, when building extensions with an installed perl, this allows
* the user to upgrade gcc and get the right attributes, rather than
* relying on the list generated at Configure time. --AD
* Set these up now otherwise we get confused when some of the <*thread.h>
* includes below indirectly pull in <perlio.h> (which needs to know if we
* have HASATTRIBUTE_FORMAT).
*/
#if defined __GNUC__ && !defined(__INTEL_COMPILER)
# if PERL_GCC_VERSION_GE(3,1,0)
# define HASATTRIBUTE_DEPRECATED
# endif
# if PERL_GCC_VERSION_GE(3,0,0) /* XXX Verify this version */
# define HASATTRIBUTE_FORMAT
# if defined __MINGW32__
# define PRINTF_FORMAT_NULL_OK
# endif
# endif
# if PERL_GCC_VERSION_GE(3,0,0)
# define HASATTRIBUTE_MALLOC
# endif
# if PERL_GCC_VERSION_GE(3,3,0)
# define HASATTRIBUTE_NONNULL
# endif
# if PERL_GCC_VERSION_GE(2,5,0)
# define HASATTRIBUTE_NORETURN
# endif
# if PERL_GCC_VERSION_GE(3,0,0)
# define HASATTRIBUTE_PURE
# endif
# if PERL_GCC_VERSION_GE(3,4,0)
# define HASATTRIBUTE_UNUSED
# endif
# if __GNUC__ == 3 && __GNUC_MINOR__ == 3 && !defined(__cplusplus)
# define HASATTRIBUTE_UNUSED /* gcc-3.3, but not g++-3.3. */
# endif
# if PERL_GCC_VERSION_GE(3,4,0)
# define HASATTRIBUTE_WARN_UNUSED_RESULT
# endif
/* always_inline is buggy in gcc <= 4.6 and causes compilation errors */
# if PERL_GCC_VERSION_GE(4,7,0)
# define HASATTRIBUTE_ALWAYS_INLINE
# endif
# if PERL_GCC_VERSION_GE(3,3,0)
# define HASATTRIBUTE_VISIBILITY
# endif
#endif
#ifdef HASATTRIBUTE_DEPRECATED
# define __attribute__deprecated__ __attribute__((deprecated))
#endif
#ifdef HASATTRIBUTE_FORMAT
# define __attribute__format__(x,y,z) __attribute__((format(x,y,z)))
#endif
#ifdef HASATTRIBUTE_MALLOC
# define __attribute__malloc__ __attribute__((__malloc__))
#endif
#ifdef HASATTRIBUTE_NONNULL
# define __attribute__nonnull__(a) __attribute__((nonnull(a)))
#endif
#ifdef HASATTRIBUTE_NORETURN
# define __attribute__noreturn__ __attribute__((noreturn))
#endif
#ifdef HASATTRIBUTE_PURE
# define __attribute__pure__ __attribute__((pure))
#endif
#ifdef HASATTRIBUTE_UNUSED
# define __attribute__unused__ __attribute__((unused))
#endif
#ifdef HASATTRIBUTE_WARN_UNUSED_RESULT
# define __attribute__warn_unused_result__ __attribute__((warn_unused_result))
#endif
#ifdef HASATTRIBUTE_ALWAYS_INLINE
/* always_inline is buggy in gcc <= 4.6 and causes compilation errors */
# if !defined(PERL_IS_GCC) || PERL_GCC_VERSION_GE(4,7,0)
# define __attribute__always_inline__ __attribute__((always_inline))
# endif
#endif
#if defined(HASATTRIBUTE_VISIBILITY) && !defined(_WIN32) && !defined(__CYGWIN__)
/* On Windows instead of this, we use __declspec(dllexport) and a .def file
* Cygwin works by exporting every global symbol, see the definition of ldflags
* near the end of hints/cygwin.sh and the visibility attribute doesn't appear
* to control that.
*/
# define __attribute__visibility__(x) __attribute__((visibility(x)))
#endif
/* If we haven't defined the attributes yet, define them to blank. */
#ifndef __attribute__deprecated__
# define __attribute__deprecated__
#endif
#ifndef __attribute__format__
# define __attribute__format__(x,y,z)
#endif
#ifndef __attribute__malloc__
# define __attribute__malloc__
#endif
#ifndef __attribute__nonnull__
# define __attribute__nonnull__(a)
#endif
#ifndef __attribute__noreturn__
# define __attribute__noreturn__
#endif
#ifndef __attribute__pure__
# define __attribute__pure__
#endif
#ifndef __attribute__unused__
# define __attribute__unused__
#endif
#ifndef __attribute__warn_unused_result__
# define __attribute__warn_unused_result__
#endif
#ifndef __attribute__always_inline__
# define __attribute__always_inline__
#endif
#ifndef __attribute__visibility__
# define __attribute__visibility__(x)
#endif
/* Some OS warn on NULL format to printf */
#ifdef PRINTF_FORMAT_NULL_OK
# define __attribute__format__null_ok__(x,y,z) __attribute__format__(x,y,z)
#else
# define __attribute__format__null_ok__(x,y,z)
#endif
/*
* Because of backward compatibility reasons the PERL_UNUSED_DECL
* cannot be changed from postfix to PERL_UNUSED_DECL(x). Sigh.
*
* Note that there are C compilers such as MetroWerks CodeWarrior
* which do not have an "inlined" way (like the gcc __attribute__) of
* marking unused variables (they need e.g. a #pragma) and therefore
* cpp macros like PERL_UNUSED_DECL cannot work for this purpose, even
* if it were PERL_UNUSED_DECL(x), which it cannot be (see above).
*/
/*
=for apidoc_section $directives
=for apidoc AmnU||PERL_UNUSED_DECL
Tells the compiler that the parameter in the function prototype just before it
is not necessarily expected to be used in the function. Not that many
compilers understand this, so this should only be used in cases where
C<L</PERL_UNUSED_ARG>> can't conveniently be used.
Example usage:
=over
Signal_t
Perl_perly_sighandler(int sig, Siginfo_t *sip PERL_UNUSED_DECL,
void *uap PERL_UNUSED_DECL, bool safe)
=back
=cut
*/
#ifndef PERL_UNUSED_DECL
# define PERL_UNUSED_DECL __attribute__unused__
#endif
/* gcc -Wall:
* for silencing unused variables that are actually used most of the time,
* but we cannot quite get rid of, such as "ax" in PPCODE+noargs xsubs,
* or variables/arguments that are used only in certain configurations.
*/
/*
=for apidoc Am;||PERL_UNUSED_ARG|void x
This is used to suppress compiler warnings that a parameter to a function is
not used. This situation can arise, for example, when a parameter is needed
under some configuration conditions, but not others, so that C preprocessor
conditional compilation causes it be used just sometimes.
=for apidoc Amn;||PERL_UNUSED_CONTEXT
This is used to suppress compiler warnings that the thread context parameter to
a function is not used. This situation can arise, for example, when a
C preprocessor conditional compilation causes it be used just some times.
=for apidoc Am;||PERL_UNUSED_VAR|void x
This is used to suppress compiler warnings that the variable I<x> is not used.
This situation can arise, for example, when a C preprocessor conditional
compilation causes it be used just some times.
=cut
*/
#ifndef PERL_UNUSED_ARG
# define PERL_UNUSED_ARG(x) ((void)sizeof(x))
#endif
#ifndef PERL_UNUSED_VAR
# define PERL_UNUSED_VAR(x) ((void)sizeof(x))
#endif
#if defined(USE_ITHREADS)
# define PERL_UNUSED_CONTEXT PERL_UNUSED_ARG(my_perl)
#else
# define PERL_UNUSED_CONTEXT
#endif
/* gcc (-ansi) -pedantic doesn't allow gcc statement expressions,
* g++ allows them but seems to have problems with them
* (insane errors ensue).
* g++ does not give insane errors now (RMB 2008-01-30, gcc 4.2.2).
*/
#if defined(PERL_GCC_PEDANTIC) || \
(defined(__GNUC__) && defined(__cplusplus) && \
(PERL_GCC_VERSION_LT(4,2,0)))
# ifndef PERL_GCC_BRACE_GROUPS_FORBIDDEN
# define PERL_GCC_BRACE_GROUPS_FORBIDDEN
# endif
#endif
/*
=for apidoc Am||PERL_UNUSED_RESULT|void x
This macro indicates to discard the return value of the function call inside
it, I<e.g.>,
PERL_UNUSED_RESULT(foo(a, b))
The main reason for this is that the combination of C<gcc -Wunused-result>
(part of C<-Wall>) and the C<__attribute__((warn_unused_result))> cannot
be silenced with casting to C<void>. This causes trouble when the system
header files use the attribute.
Use C<PERL_UNUSED_RESULT> sparingly, though, since usually the warning
is there for a good reason: you might lose success/failure information,
or leak resources, or changes in resources.
But sometimes you just want to ignore the return value, I<e.g.>, on
codepaths soon ending up in abort, or in "best effort" attempts,
or in situations where there is no good way to handle failures.
Sometimes C<PERL_UNUSED_RESULT> might not be the most natural way:
another possibility is that you can capture the return value
and use C<L</PERL_UNUSED_VAR>> on that.
=cut
The __typeof__() is used instead of typeof() since typeof() is not
available under strict ISO C, and because of compilers masquerading
as gcc (clang and icc), we want exactly the gcc extension
__typeof__ and nothing else.
*/
#ifndef PERL_UNUSED_RESULT
# if defined(__GNUC__) && defined(HASATTRIBUTE_WARN_UNUSED_RESULT)
# define PERL_UNUSED_RESULT(v) STMT_START { __typeof__(v) z = (v); (void)sizeof(z); } STMT_END
# else
# define PERL_UNUSED_RESULT(v) ((void)(v))
# endif
#endif
/* on gcc (and clang), specify that a warning should be temporarily
* ignored; e.g.
*
* GCC_DIAG_IGNORE_DECL(-Wmultichar);
* char b = 'ab';
* GCC_DIAG_RESTORE_DECL;
*
* based on http://dbp-consulting.com/tutorials/SuppressingGCCWarnings.html
*
* Note that "pragma GCC diagnostic push/pop" was added in GCC 4.6, Mar 2011;
* clang only pretends to be GCC 4.2, but still supports push/pop.
*
* Note on usage: all macros must be used at a place where a declaration
* or statement can occur, i.e., not in the middle of an expression.
* *_DIAG_IGNORE() and *_DIAG_RESTORE can be used in any such place, but
* must be used without a following semicolon. *_DIAG_IGNORE_DECL() and
* *_DIAG_RESTORE_DECL must be used with a following semicolon, and behave
* syntactically as declarations (like dNOOP). *_DIAG_IGNORE_STMT()
* and *_DIAG_RESTORE_STMT must be used with a following semicolon,
* and behave syntactically as statements (like NOOP).
*
*/
#if defined(__clang__) || defined(__clang) || PERL_GCC_VERSION_GE(4,6,0)
# define GCC_DIAG_PRAGMA(x) _Pragma (#x)
/* clang has "clang diagnostic" pragmas, but also understands gcc. */
# define GCC_DIAG_IGNORE(x) _Pragma("GCC diagnostic push") \
GCC_DIAG_PRAGMA(GCC diagnostic ignored #x)
# define GCC_DIAG_RESTORE _Pragma("GCC diagnostic pop")
#else
# define GCC_DIAG_IGNORE(w)
# define GCC_DIAG_RESTORE
#endif
#define GCC_DIAG_IGNORE_DECL(x) GCC_DIAG_IGNORE(x) dNOOP
#define GCC_DIAG_RESTORE_DECL GCC_DIAG_RESTORE dNOOP
#define GCC_DIAG_IGNORE_STMT(x) GCC_DIAG_IGNORE(x) NOOP
#define GCC_DIAG_RESTORE_STMT GCC_DIAG_RESTORE NOOP
/* for clang specific pragmas */
#if defined(__clang__) || defined(__clang)
# define CLANG_DIAG_PRAGMA(x) _Pragma (#x)
# define CLANG_DIAG_IGNORE(x) _Pragma("clang diagnostic push") \
CLANG_DIAG_PRAGMA(clang diagnostic ignored #x)
# define CLANG_DIAG_RESTORE _Pragma("clang diagnostic pop")
#else
# define CLANG_DIAG_IGNORE(w)
# define CLANG_DIAG_RESTORE
#endif
#define CLANG_DIAG_IGNORE_DECL(x) CLANG_DIAG_IGNORE(x) dNOOP
#define CLANG_DIAG_RESTORE_DECL CLANG_DIAG_RESTORE dNOOP
#define CLANG_DIAG_IGNORE_STMT(x) CLANG_DIAG_IGNORE(x) NOOP
#define CLANG_DIAG_RESTORE_STMT CLANG_DIAG_RESTORE NOOP
#if defined(_MSC_VER)
# define MSVC_DIAG_IGNORE(x) __pragma(warning(push)) \
__pragma(warning(disable : x))
# define MSVC_DIAG_RESTORE __pragma(warning(pop))
#else
# define MSVC_DIAG_IGNORE(x)
# define MSVC_DIAG_RESTORE
#endif
#define MSVC_DIAG_IGNORE_DECL(x) MSVC_DIAG_IGNORE(x) dNOOP
#define MSVC_DIAG_RESTORE_DECL MSVC_DIAG_RESTORE dNOOP
#define MSVC_DIAG_IGNORE_STMT(x) MSVC_DIAG_IGNORE(x) NOOP
#define MSVC_DIAG_RESTORE_STMT MSVC_DIAG_RESTORE NOOP
/*
=for apidoc Amn;||NOOP
Do nothing; typically used as a placeholder to replace something that used to
do something.
=for apidoc Amn;||dNOOP
Declare nothing; typically used as a placeholder to replace something that used
to declare something. Works on compilers that require declarations before any
code.
=cut
*/
#define NOOP ((void)0)
#define dNOOP struct Perl___notused_struct
#ifndef pTHX
/* Don't bother defining tTHX ; using it outside
* code guarded by MULTIPLICITY is an error.
*/
# define pTHX void
# define pTHX_
# define aTHX
# define aTHX_
# define aTHXa(a) NOOP
# define dTHXa(a) dNOOP
# define dTHX dNOOP
# define pTHX_1 1
# define pTHX_2 2
# define pTHX_3 3
# define pTHX_4 4
# define pTHX_5 5
# define pTHX_6 6
# define pTHX_7 7
# define pTHX_8 8
# define pTHX_9 9
# define pTHX_12 12
#endif
/*
=for apidoc_section $concurrency
=for apidoc AmnU||dVAR
This is now a synonym for dNOOP: declare nothing
=for apidoc_section $XS
=for apidoc Amn;||dMY_CXT_SV
Now a placeholder that declares nothing
=cut
*/
#ifndef PERL_CORE
/* Backwards compatibility macro for XS code. It used to be part of the
* PERL_GLOBAL_STRUCT(_PRIVATE) feature, which no longer exists */
# define dVAR dNOOP
/* these are only defined for compatibility; should not be used internally.
* */
# define dMY_CXT_SV dNOOP
# ifndef pTHXo
# define pTHXo pTHX
# define pTHXo_ pTHX_
# define aTHXo aTHX
# define aTHXo_ aTHX_
# define dTHXo dTHX
# define dTHXoa(x) dTHXa(x)
# endif
#endif
#ifndef pTHXx
# define pTHXx PerlInterpreter *my_perl
# define pTHXx_ pTHXx,
# define aTHXx my_perl
# define aTHXx_ aTHXx,
# define dTHXx dTHX
#endif
/* Under PERL_IMPLICIT_SYS (used in Windows for fork emulation)
* PerlIO_foo() expands to PL_StdIO->pFOO(PL_StdIO, ...).
* dTHXs is therefore needed for all functions using PerlIO_foo(). */
#ifdef PERL_IMPLICIT_SYS
# define dTHXs dTHX
#else
# define dTHXs dNOOP
#endif
#if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN) && !defined(__cplusplus)
# ifndef PERL_USE_GCC_BRACE_GROUPS
# define PERL_USE_GCC_BRACE_GROUPS
# endif
#endif
/*
=for apidoc_section $directives
=for apidoc AmnUu|void|STMT_END
=for apidoc_item | |STMT_START
These allow a series of statements in a macro to be used as a single statement,
as in
if (x) STMT_START { ... } STMT_END else ...
Note that you can't return a value out of this construct and cannot use it as
an operand to the comma operator. These limit its utility.
But, a value could be returned by constructing the API so that a pointer is
passed and the macro dereferences this to set the return. If the value can be
any of various types, depending on context, you can handle that situation in
some situations by adding the type of the return as an extra accompanying
parameter:
#define foo(param, type) STMT_START {
type * param; *param = do_calc; ...
} STMT_END
This could be awkward, so consider instead using a C language C<static inline>
function.
If you do use this construct, it is easy to forget that it is a macro and not a
function, and hence fall into traps that might not show up until someone
someday writes code which contains names that clash with the ones you chose
here, or calls it with a parameter which is an expression with side effects,
the consequences of which you didn't think about. See L<perlhacktips/Writing
safer macros> for how to avoid these.
=for apidoc_section $genconfig
=for apidoc Amn#||PERL_USE_GCC_BRACE_GROUPS
This C pre-processor value, if defined, indicates that it is permissible to use
the GCC brace groups extension. However, use of this extension is DISCOURAGED.
Use a C<static inline> function instead.
The extension, of the form
({ statement ... })
turns the block consisting of I<statement ...> into an expression with a
value, unlike plain C language blocks. This can present optimization
possibilities, B<BUT>, unless you know for sure that this will never be
compiled without this extension being available and not forbidden, you need to
specify an alternative. Thus two code paths have to be maintained, which can
get out-of-sync. All these issues are solved by using a C<static inline>
function instead.
Perl can be configured to not use this feature by passing the parameter
C<-Accflags=-DPERL_GCC_BRACE_GROUPS_FORBIDDEN> to F<Configure>.
=for apidoc Amnh#||PERL_GCC_BRACE_GROUPS_FORBIDDEN
Example usage:
=over
#ifdef PERL_USE_GCC_BRACE_GROUPS
...
#else
...
#endif
=back
=cut
Trying to select a version that gives no warnings...
*/
#if !(defined(STMT_START) && defined(STMT_END))
# define STMT_START do
# define STMT_END while (0)
#endif
#ifndef BYTEORDER /* Should never happen -- byteorder is in config.h */
# define BYTEORDER 0x1234
#endif
/*
=for apidoc_section $genconfig
=for apidoc Amn#||ASCIIish
A preprocessor symbol that is defined iff the system is an ASCII platform; this
symbol would not be defined on C<L</EBCDIC>> platforms.
=cut
*/
#if 'A' == 65 && 'I' == 73 && 'J' == 74 && 'Z' == 90
# define ASCIIish
#else
# undef ASCIIish
#endif
/*
* The following contortions are brought to you on behalf of all the
* standards, semi-standards, de facto standards, not-so-de-facto standards
* of the world, as well as all the other botches anyone ever thought of.
* The basic theory is that if we work hard enough here, the rest of the
* code can be a lot prettier. Well, so much for theory. Sorry, Henry...
*/
/* define this once if either system, instead of cluttering up the src */
#if defined(WIN32)
#define DOSISH 1
#endif
/* These exist only for back-compat with XS modules. */
#ifndef PERL_CORE
#define VOL volatile
#define CAN_PROTOTYPE
#define _(args) args
#define I_LIMITS
#define I_STDARG
#define STANDARD_C
#endif
/* Don't compile 'code' if PERL_MEM_LOG is defined. This is used for
* constructs that don't play well when PERL_MEM_LOG is active, so that they
* automatically don't get compiled without having to use extra #ifdef's */
#ifndef PERL_MEM_LOG
# define UNLESS_PERL_MEM_LOG(code) code
#else
# define UNLESS_PERL_MEM_LOG(code)
#endif
/* By compiling a perl with -DNO_TAINT_SUPPORT or -DSILENT_NO_TAINT_SUPPORT,
* you get a perl without taint support, but doubtlessly with a lesser
* degree of support. Do not do so unless you know exactly what it means
* technically, have a good reason to do so, and know exactly how the
* perl will be used. perls with -DSILENT_NO_TAINT_SUPPORT are considered
* a potential security risk due to flat out ignoring the security-relevant
* taint flags. This being said, a perl without taint support compiled in
* has marginal run-time performance benefits.
* SILENT_NO_TAINT_SUPPORT implies NO_TAINT_SUPPORT.
* SILENT_NO_TAINT_SUPPORT is the same as NO_TAINT_SUPPORT except it
* silently ignores -t/-T instead of throwing an exception.
*
* DANGER! Using NO_TAINT_SUPPORT or SILENT_NO_TAINT_SUPPORT
* voids your nonexistent warranty!
*/
#if defined(SILENT_NO_TAINT_SUPPORT) && !defined(NO_TAINT_SUPPORT)
# define NO_TAINT_SUPPORT 1
#endif
/* NO_TAINT_SUPPORT can be set to transform virtually all taint-related
* operations into no-ops for a very modest speed-up. Enable only if you
* know what you're doing: tests and CPAN modules' tests are bound to fail.
*/
#ifdef NO_TAINT_SUPPORT
# define TAINT NOOP
# define TAINT_NOT NOOP
# define TAINT_IF(c) NOOP
# define TAINT_ENV() NOOP
# define TAINT_PROPER(s) NOOP
# define TAINT_set(s) NOOP
# define TAINT_get 0
# define TAINTING_get 0
# define TAINTING_set(s) NOOP
# define TAINT_WARN_get 0
# define TAINT_WARN_set(s) NOOP
#else
/*
=for apidoc_section $tainting
=for apidoc Cm|void|TAINT
If we aren't in taint checking mode, do nothing;
otherwise indicate to L</C<TAINT_set>> and L</C<TAINT_PROPER>> that some
unspecified element is tainted.
=for apidoc Cm|void|TAINT_NOT
Remove any taintedness previously set by, I<e.g.>, C<TAINT>.
=for apidoc Cm|void|TAINT_IF|bool c
If C<c> evaluates to true, call L</C<TAINT>> to indicate that something is
tainted; otherwise do nothing.
=for apidoc Cmn|void|TAINT_ENV
Looks at several components of L<C<%ENV>|perlvar/%ENV> for taintedness, and
calls L</C<taint_proper>> if any are tainted. The components it searches are
things like C<$PATH>.
=for apidoc Cm|void|TAINT_PROPER|const char * s
If no element is tainted, do nothing;
otherwise output a message (containing C<s>) that indicates there is a
tainting violation. If such violations are fatal, it croaks.
=for apidoc Cm|void|TAINT_set|bool s
If C<s> is true, L</C<TAINT_get>> returns true;
If C<s> is false, L</C<TAINT_get>> returns false;
=for apidoc Cm|bool|TAINT_get
Returns a boolean as to whether some element is tainted or not.
=for apidoc Cm|bool|TAINTING_get