[p5sagit/p5-mst-13.2.git] / scope.h

/*    scope.h
 *
 *    Copyright (c) 1997-2002, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

#define SAVEt_ITEM		0
#define SAVEt_SV		1
#define SAVEt_AV		2
#define SAVEt_HV		3
#define SAVEt_INT		4
#define SAVEt_LONG		5
#define SAVEt_I32		6
#define SAVEt_IV		7
#define SAVEt_SPTR		8
#define SAVEt_APTR		9
#define SAVEt_HPTR		10
#define SAVEt_PPTR		11
#define SAVEt_NSTAB		12
#define SAVEt_SVREF		13
#define SAVEt_GP		14
#define SAVEt_FREESV		15
#define SAVEt_FREEOP		16
#define SAVEt_FREEPV		17
#define SAVEt_CLEARSV		18
#define SAVEt_DELETE		19
#define SAVEt_DESTRUCTOR	20
#define SAVEt_REGCONTEXT	21
#define SAVEt_STACK_POS		22
#define SAVEt_I16		23
#define SAVEt_AELEM		24
#define SAVEt_HELEM		25
#define SAVEt_OP		26
#define SAVEt_HINTS		27
#define SAVEt_ALLOC		28
#define SAVEt_GENERIC_SVREF	29
#define SAVEt_DESTRUCTOR_X	30
#define SAVEt_VPTR		31
#define SAVEt_I8		32
#define SAVEt_COMPPAD		33
#define SAVEt_GENERIC_PVREF	34
#define SAVEt_PADSV		35
#define SAVEt_MORTALIZESV	36
#define SAVEt_SHARED_PVREF	37

#ifndef SCOPE_SAVES_SIGNAL_MASK
#define SCOPE_SAVES_SIGNAL_MASK 0
#endif

#define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)

/*
=head1 Callback Functions

=for apidoc Ams||SAVETMPS
Opening bracket for temporaries on a callback.  See C<FREETMPS> and
L<perlcall>.

=for apidoc Ams||FREETMPS
Closing bracket for temporaries on a callback.  See C<SAVETMPS> and
L<perlcall>.

=for apidoc Ams||ENTER
Opening bracket on a callback.  See C<LEAVE> and L<perlcall>.

=for apidoc Ams||LEAVE
Closing bracket on a callback.  See C<ENTER> and L<perlcall>.

=cut
*/

#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()

#ifdef DEBUGGING
#define ENTER							\
    STMT_START {						\
	push_scope();						\
	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n",	\
		    PL_scopestack_ix, __FILE__, __LINE__)));	\
    } STMT_END
#define LEAVE							\
    STMT_START {						\
	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n",	\
		    PL_scopestack_ix, __FILE__, __LINE__)));	\
	pop_scope();						\
    } STMT_END
#else
#define ENTER push_scope()
#define LEAVE pop_scope()
#endif
#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)

/*
 * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
 * because these are used for several kinds of pointer values
 */
#define SAVEI8(i)	save_I8(SOFT_CAST(I8*)&(i))
#define SAVEI16(i)	save_I16(SOFT_CAST(I16*)&(i))
#define SAVEI32(i)	save_I32(SOFT_CAST(I32*)&(i))
#define SAVEINT(i)	save_int(SOFT_CAST(int*)&(i))
#define SAVEIV(i)	save_iv(SOFT_CAST(IV*)&(i))
#define SAVELONG(l)	save_long(SOFT_CAST(long*)&(l))
#define SAVESPTR(s)	save_sptr((SV**)&(s))
#define SAVEPPTR(s)	save_pptr(SOFT_CAST(char**)&(s))
#define SAVEVPTR(s)	save_vptr((void*)&(s))
#define SAVEPADSV(s)	save_padsv(s)
#define SAVEFREESV(s)	save_freesv((SV*)(s))
#define SAVEMORTALIZESV(s)	save_mortalizesv((SV*)(s))
#define SAVEFREEOP(o)	save_freeop(SOFT_CAST(OP*)(o))
#define SAVEFREEPV(p)	save_freepv(SOFT_CAST(char*)(p))
#define SAVECLEARSV(sv)	save_clearsv(SOFT_CAST(SV**)&(sv))
#define SAVEGENERICSV(s)	save_generic_svref((SV**)&(s))
#define SAVEGENERICPV(s)	save_generic_pvref((char**)&(s))
#define SAVESHAREDPV(s)		save_shared_pvref((char**)&(s))
#define SAVEDELETE(h,k,l) \
	  save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l))
#define SAVEDESTRUCTOR(f,p) \
	  save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p))

#define SAVEDESTRUCTOR_X(f,p) \
	  save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p))

#define SAVESTACK_POS() \
    STMT_START {				\
	SSCHECK(2);				\
	SSPUSHINT(PL_stack_sp - PL_stack_base);	\
	SSPUSHINT(SAVEt_STACK_POS);		\
    } STMT_END

#define SAVEOP()	save_op()

#define SAVEHINTS() \
    STMT_START {				\
	if (PL_hints & HINT_LOCALIZE_HH)	\
	    save_hints();			\
	else {					\
	    SSCHECK(2);				\
	    SSPUSHINT(PL_hints);		\
	    SSPUSHINT(SAVEt_HINTS);		\
	}					\
    } STMT_END

#define SAVECOMPPAD() \
    STMT_START {						\
	if (PL_comppad && PL_curpad == AvARRAY(PL_comppad)) {	\
	    SSCHECK(2);						\
	    SSPUSHPTR((SV*)PL_comppad);				\
	    SSPUSHINT(SAVEt_COMPPAD);				\
	}							\
	else {							\
	    SAVEVPTR(PL_curpad);				\
	    SAVESPTR(PL_comppad);				\
	}							\
    } STMT_END

#ifdef USE_ITHREADS
#  define SAVECOPSTASH(c)	SAVEPPTR(CopSTASHPV(c))
#  define SAVECOPSTASH_FREE(c)	SAVESHAREDPV(CopSTASHPV(c))
#  define SAVECOPFILE(c)	SAVEPPTR(CopFILE(c))
#  define SAVECOPFILE_FREE(c)	SAVESHAREDPV(CopFILE(c))
#else
#  define SAVECOPSTASH(c)	SAVESPTR(CopSTASH(c))
#  define SAVECOPSTASH_FREE(c)	SAVECOPSTASH(c)	/* XXX not refcounted */
#  define SAVECOPFILE(c)	SAVESPTR(CopFILEGV(c))
#  define SAVECOPFILE_FREE(c)	SAVEGENERICSV(CopFILEGV(c))
#endif

#define SAVECOPLINE(c)		SAVEI16(CopLINE(c))

/* SSNEW() temporarily allocates a specified number of bytes of data on the
 * savestack.  It returns an integer index into the savestack, because a
 * pointer would get broken if the savestack is moved on reallocation.
 * SSNEWa() works like SSNEW(), but also aligns the data to the specified
 * number of bytes.  MEM_ALIGNBYTES is perhaps the most useful.  The
 * alignment will be preserved therough savestack reallocation *only* if
 * realloc returns data aligned to a size divisible by `align'!
 *
 * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
 */

#define SSNEW(size)             Perl_save_alloc(aTHX_ (size), 0)
#define SSNEWt(n,t)             SSNEW((n)*sizeof(t))
#define SSNEWa(size,align)	Perl_save_alloc(aTHX_ (size), \
    (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
#define SSNEWat(n,t,align)	SSNEWa((n)*sizeof(t), align)

#define SSPTR(off,type)         ((type)  ((char*)PL_savestack + off))
#define SSPTRt(off,type)        ((type*) ((char*)PL_savestack + off))

/* A jmpenv packages the state required to perform a proper non-local jump.
 * Note that there is a start_env initialized when perl starts, and top_env
 * points to this initially, so top_env should always be non-null.
 *
 * Existence of a non-null top_env->je_prev implies it is valid to call
 * longjmp() at that runlevel (we make sure start_env.je_prev is always
 * null to ensure this).
 *
 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
 * establish a local jmpenv to handle exception traps.  Care must be taken
 * to restore the previous value of je_mustcatch before exiting the
 * stack frame iff JMPENV_PUSH was not called in that stack frame.
 * GSAR 97-03-27
 */

struct jmpenv {
    struct jmpenv *	je_prev;
    Sigjmp_buf		je_buf;		/* only for use if !je_throw */
    int			je_ret;		/* last exception thrown */
    bool		je_mustcatch;	/* need to call longjmp()? */
#ifdef PERL_FLEXIBLE_EXCEPTIONS
    void		(*je_throw)(int v); /* last for bincompat */
    bool		je_noset;	/* no need for setjmp() */
#endif
};

typedef struct jmpenv JMPENV;

#ifdef OP_IN_REGISTER
#define OP_REG_TO_MEM	PL_opsave = op
#define OP_MEM_TO_REG	op = PL_opsave
#else
#define OP_REG_TO_MEM	NOOP
#define OP_MEM_TO_REG	NOOP
#endif

/*
 * How to build the first jmpenv.
 *
 * top_env needs to be non-zero. It points to an area
 * in which longjmp() stuff is stored, as C callstack
 * info there at least is thread specific this has to
 * be per-thread. Otherwise a 'die' in a thread gives
 * that thread the C stack of last thread to do an eval {}!
 */

#define JMPENV_BOOTSTRAP \
    STMT_START {				\
	Zero(&PL_start_env, 1, JMPENV);		\
	PL_start_env.je_ret = -1;		\
	PL_start_env.je_mustcatch = TRUE;	\
	PL_top_env = &PL_start_env;		\
    } STMT_END

#ifdef PERL_FLEXIBLE_EXCEPTIONS

/*
 * These exception-handling macros are split up to
 * ease integration with C++ exceptions.
 *
 * To use C++ try+catch to catch Perl exceptions, an extension author
 * needs to first write an extern "C" function to throw an appropriate
 * exception object; typically it will be or contain an integer,
 * because Perl's internals use integers to track exception types:
 *    extern "C" { static void thrower(int i) { throw i; } }
 *
 * Then (as shown below) the author needs to use, not the simple
 * JMPENV_PUSH, but several of its constitutent macros, to arrange for
 * the Perl internals to call thrower() rather than longjmp() to
 * report exceptions:
 *
 *    dJMPENV;
 *    JMPENV_PUSH_INIT(thrower);
 *    try {
 *        ... stuff that may throw exceptions ...
 *    }
 *    catch (int why) {  // or whatever matches thrower()
 *        JMPENV_POST_CATCH;
 *        EXCEPT_SET(why);
 *        switch (why) {
 *          ... // handle various Perl exception codes
 *        }
 *    }
 *    JMPENV_POP;  // don't forget this!
 */

/*
 * Function that catches/throws, and its callback for the
 *  body of protected processing.
 */
typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list);
typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env,
					     int *, protect_body_t, ...);

#define dJMPENV	JMPENV cur_env;	\
		volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env)

#define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \
    STMT_START {					\
	(ce).je_throw = (THROWFUNC);			\
	(ce).je_ret = -1;				\
	(ce).je_mustcatch = FALSE;			\
	(ce).je_prev = PL_top_env;			\
	PL_top_env = &(ce);				\
	OP_REG_TO_MEM;					\
    } STMT_END

#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(*(JMPENV*)pcur_env,THROWFUNC)

#define JMPENV_POST_CATCH_ENV(ce) \
    STMT_START {					\
	OP_MEM_TO_REG;					\
	PL_top_env = &(ce);				\
    } STMT_END

#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(*(JMPENV*)pcur_env)

#define JMPENV_PUSH_ENV(ce,v) \
    STMT_START {						\
	if (!(ce).je_noset) {					\
	    DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n",	\
			     ce, PL_top_env));			\
	    JMPENV_PUSH_INIT_ENV(ce,NULL);			\
	    EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, SCOPE_SAVES_SIGNAL_MASK));\
	    (ce).je_noset = 1;					\
	}							\
	else							\
	    EXCEPT_SET_ENV(ce,0);				\
	JMPENV_POST_CATCH_ENV(ce);				\
	(v) = EXCEPT_GET_ENV(ce);				\
    } STMT_END

#define JMPENV_PUSH(v) JMPENV_PUSH_ENV(*(JMPENV*)pcur_env,v)

#define JMPENV_POP_ENV(ce) \
    STMT_START {						\
	if (PL_top_env == &(ce))				\
	    PL_top_env = (ce).je_prev;				\
    } STMT_END

#define JMPENV_POP  JMPENV_POP_ENV(*(JMPENV*)pcur_env)

#define JMPENV_JUMP(v) \
    STMT_START {						\
	OP_REG_TO_MEM;						\
	if (PL_top_env->je_prev) {				\
	    if (PL_top_env->je_throw)				\
		PL_top_env->je_throw(v);			\
	    else						\
		PerlProc_longjmp(PL_top_env->je_buf, (v));	\
	}							\
	if ((v) == 2)						\
	    PerlProc_exit(STATUS_NATIVE_EXPORT);		\
	PerlIO_printf(Perl_error_log, "panic: top_env\n");	\
	PerlProc_exit(1);					\
    } STMT_END

#define EXCEPT_GET_ENV(ce)	((ce).je_ret)
#define EXCEPT_GET		EXCEPT_GET_ENV(*(JMPENV*)pcur_env)
#define EXCEPT_SET_ENV(ce,v)	((ce).je_ret = (v))
#define EXCEPT_SET(v)		EXCEPT_SET_ENV(*(JMPENV*)pcur_env,v)

#else /* !PERL_FLEXIBLE_EXCEPTIONS */

#define dJMPENV		JMPENV cur_env

#define JMPENV_PUSH(v) \
    STMT_START {							\
	DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n",	\
			 &cur_env, PL_top_env));			\
	cur_env.je_prev = PL_top_env;					\
	OP_REG_TO_MEM;							\
	cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK);		\
	OP_MEM_TO_REG;							\
	PL_top_env = &cur_env;						\
	cur_env.je_mustcatch = FALSE;					\
	(v) = cur_env.je_ret;						\
    } STMT_END

#define JMPENV_POP \
    STMT_START { PL_top_env = cur_env.je_prev; } STMT_END

#define JMPENV_JUMP(v) \
    STMT_START {						\
	OP_REG_TO_MEM;						\
	if (PL_top_env->je_prev)				\
	    PerlProc_longjmp(PL_top_env->je_buf, (v));		\
	if ((v) == 2)						\
	    PerlProc_exit(STATUS_NATIVE_EXPORT);		\
	PerlIO_printf(PerlIO_stderr(), "panic: top_env\n");	\
	PerlProc_exit(1);					\
    } STMT_END

#endif /* PERL_FLEXIBLE_EXCEPTIONS */

#define CATCH_GET		(PL_top_env->je_mustcatch)
#define CATCH_SET(v)		(PL_top_env->je_mustcatch = (v))
Commit	Line	Data
d6376244	1	/* scope.h
	2	*
	3	* Copyright (c) 1997-2002, Larry Wall
	4	*
	5	* You may distribute under the terms of either the GNU General Public
	6	* License or the Artistic License, as specified in the README file.
	7	*
	8	*/
	9
b9d12d37	10	#define SAVEt_ITEM 0
	11	#define SAVEt_SV 1
	12	#define SAVEt_AV 2
	13	#define SAVEt_HV 3
	14	#define SAVEt_INT 4
	15	#define SAVEt_LONG 5
	16	#define SAVEt_I32 6
	17	#define SAVEt_IV 7
	18	#define SAVEt_SPTR 8
	19	#define SAVEt_APTR 9
	20	#define SAVEt_HPTR 10
	21	#define SAVEt_PPTR 11
	22	#define SAVEt_NSTAB 12
	23	#define SAVEt_SVREF 13
	24	#define SAVEt_GP 14
	25	#define SAVEt_FREESV 15
	26	#define SAVEt_FREEOP 16
	27	#define SAVEt_FREEPV 17
	28	#define SAVEt_CLEARSV 18
	29	#define SAVEt_DELETE 19
	30	#define SAVEt_DESTRUCTOR 20
	31	#define SAVEt_REGCONTEXT 21
	32	#define SAVEt_STACK_POS 22
	33	#define SAVEt_I16 23
	34	#define SAVEt_AELEM 24
	35	#define SAVEt_HELEM 25
	36	#define SAVEt_OP 26
	37	#define SAVEt_HINTS 27
	38	#define SAVEt_ALLOC 28
	39	#define SAVEt_GENERIC_SVREF 29
c76ac1ee	40	#define SAVEt_DESTRUCTOR_X 30
7766f137	41	#define SAVEt_VPTR 31
e8347627	42	#define SAVEt_I8 32
354992b1	43	#define SAVEt_COMPPAD 33
f4dd75d9	44	#define SAVEt_GENERIC_PVREF 34
c3564e5c	45	#define SAVEt_PADSV 35
26d9b02f	46	#define SAVEt_MORTALIZESV 36
05ec9bb3	47	#define SAVEt_SHARED_PVREF 37
79072805	48
b03c0a3a	49	#ifndef SCOPE_SAVES_SIGNAL_MASK
1b266415	50	#define SCOPE_SAVES_SIGNAL_MASK 0
b03c0a3a	51	#endif
b03c0a3a	52
3280af22	53	#define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
	54	#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
	55	#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
	56	#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
	57	#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
	58	#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
c76ac1ee	59	#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
3280af22	60	#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
	61	#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
	62	#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
	63	#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
	64	#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
c76ac1ee	65	#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
8990e307	66
954c1994	67	/*
ccfc67b7	68	=head1 Callback Functions
ccfc67b7	69
954c1994	70	=for apidoc Ams\|\|SAVETMPS
	71	Opening bracket for temporaries on a callback. See C<FREETMPS> and
	72	L<perlcall>.
	73
	74	=for apidoc Ams\|\|FREETMPS
	75	Closing bracket for temporaries on a callback. See C<SAVETMPS> and
	76	L<perlcall>.
	77
	78	=for apidoc Ams\|\|ENTER
	79	Opening bracket on a callback. See C<LEAVE> and L<perlcall>.
	80
	81	=for apidoc Ams\|\|LEAVE
	82	Closing bracket on a callback. See C<ENTER> and L<perlcall>.
	83
	84	=cut
	85	*/
	86
3280af22	87	#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
3280af22	88	#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
a0d0e21e	89
f46d017c	90	#ifdef DEBUGGING
	91	#define ENTER \
	92	STMT_START { \
	93	push_scope(); \
cea2e8a9	94	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \
3280af22	95	PL_scopestack_ix, __FILE__, __LINE__))); \
f46d017c	96	} STMT_END
	97	#define LEAVE \
	98	STMT_START { \
cea2e8a9	99	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \
3280af22	100	PL_scopestack_ix, __FILE__, __LINE__))); \
f46d017c	101	pop_scope(); \
	102	} STMT_END
	103	#else
a0d0e21e	104	#define ENTER push_scope()
a0d0e21e	105	#define LEAVE pop_scope()
f46d017c	106	#endif
3280af22	107	#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
a0d0e21e	108
55497cff	109	/*
b9d12d37	110	* Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
55497cff	111	* because these are used for several kinds of pointer values
55497cff	112	*/
e8347627	113	#define SAVEI8(i) save_I8(SOFT_CAST(I8*)&(i))
4fdae800	114	#define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i))
	115	#define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i))
	116	#define SAVEINT(i) save_int(SOFT_CAST(int*)&(i))
	117	#define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i))
	118	#define SAVELONG(l) save_long(SOFT_CAST(long*)&(l))
55497cff	119	#define SAVESPTR(s) save_sptr((SV**)&(s))
55497cff	120	#define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s))
57b2e452	121	#define SAVEVPTR(s) save_vptr((void*)&(s))
c3564e5c	122	#define SAVEPADSV(s) save_padsv(s)
55497cff	123	#define SAVEFREESV(s) save_freesv((SV*)(s))
26d9b02f	124	#define SAVEMORTALIZESV(s) save_mortalizesv((SV*)(s))
55497cff	125	#define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o))
	126	#define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p))
	127	#define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv))
b9d12d37	128	#define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
f4dd75d9	129	#define SAVEGENERICPV(s) save_generic_pvref((char**)&(s))
05ec9bb3	130	#define SAVESHAREDPV(s) save_shared_pvref((char**)&(s))
55497cff	131	#define SAVEDELETE(h,k,l) \
	132	save_delete(SOFT_CAST(HV)(h), SOFT_CAST(char)(k), (I32)(l))
	133	#define SAVEDESTRUCTOR(f,p) \
c76ac1ee	134	save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p))
	135
	136	#define SAVEDESTRUCTOR_X(f,p) \
	137	save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p))
25eaa213	138
	139	#define SAVESTACK_POS() \
	140	STMT_START { \
	141	SSCHECK(2); \
3280af22	142	SSPUSHINT(PL_stack_sp - PL_stack_base); \
25eaa213	143	SSPUSHINT(SAVEt_STACK_POS); \
	144	} STMT_END
	145
462e5cf6	146	#define SAVEOP() save_op()
25eaa213	147
	148	#define SAVEHINTS() \
	149	STMT_START { \
3280af22	150	if (PL_hints & HINT_LOCALIZE_HH) \
25eaa213	151	save_hints(); \
	152	else { \
	153	SSCHECK(2); \
3280af22	154	SSPUSHINT(PL_hints); \
25eaa213	155	SSPUSHINT(SAVEt_HINTS); \
	156	} \
	157	} STMT_END
354992b1	158
	159	#define SAVECOMPPAD() \
	160	STMT_START { \
	161	if (PL_comppad && PL_curpad == AvARRAY(PL_comppad)) { \
	162	SSCHECK(2); \
	163	SSPUSHPTR((SV*)PL_comppad); \
	164	SSPUSHINT(SAVEt_COMPPAD); \
	165	} \
	166	else { \
	167	SAVEVPTR(PL_curpad); \
	168	SAVESPTR(PL_comppad); \
	169	} \
	170	} STMT_END
a9332b4a	171
57843af0	172	#ifdef USE_ITHREADS
f4dd75d9	173	# define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c))
05ec9bb3	174	# define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c))
f4dd75d9	175	# define SAVECOPFILE(c) SAVEPPTR(CopFILE(c))
05ec9bb3	176	# define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c))
57843af0	177	#else
f4dd75d9	178	# define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c))
	179	# define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */
	180	# define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c))
	181	# define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c))
57843af0	182	#endif
57843af0	183
f4dd75d9	184	#define SAVECOPLINE(c) SAVEI16(CopLINE(c))
57843af0	185
455ece5e	186	/* SSNEW() temporarily allocates a specified number of bytes of data on the
	187	* savestack. It returns an integer index into the savestack, because a
	188	* pointer would get broken if the savestack is moved on reallocation.
	189	* SSNEWa() works like SSNEW(), but also aligns the data to the specified
	190	* number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
	191	* alignment will be preserved therough savestack reallocation only if
	192	* realloc returns data aligned to a size divisible by `align'!
	193	*
	194	* SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
	195	*/
	196
f2b2c1a7	197	#define SSNEW(size) Perl_save_alloc(aTHX_ (size), 0)
02db2b7b	198	#define SSNEWt(n,t) SSNEW((n)*sizeof(t))
f2b2c1a7	199	#define SSNEWa(size,align) Perl_save_alloc(aTHX_ (size), \
455ece5e	200	(align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
02db2b7b	201	#define SSNEWat(n,t,align) SSNEWa((n)*sizeof(t), align)
455ece5e	202
02db2b7b	203	#define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
02db2b7b	204	#define SSPTRt(off,type) ((type) ((char)PL_savestack + off))
455ece5e	205
54310121	206	/* A jmpenv packages the state required to perform a proper non-local jump.
	207	* Note that there is a start_env initialized when perl starts, and top_env
	208	* points to this initially, so top_env should always be non-null.
	209	*
	210	* Existence of a non-null top_env->je_prev implies it is valid to call
6224f72b	211	* longjmp() at that runlevel (we make sure start_env.je_prev is always
6224f72b	212	* null to ensure this).
54310121	213	*
	214	* je_mustcatch, when set at any runlevel to TRUE, means eval ops must
	215	* establish a local jmpenv to handle exception traps. Care must be taken
	216	* to restore the previous value of je_mustcatch before exiting the
	217	* stack frame iff JMPENV_PUSH was not called in that stack frame.
6224f72b	218	* GSAR 97-03-27
54310121	219	*/
	220
	221	struct jmpenv {
	222	struct jmpenv * je_prev;
312caa8e	223	Sigjmp_buf je_buf; /* only for use if !je_throw */
	224	int je_ret; /* last exception thrown */
	225	bool je_mustcatch; /* need to call longjmp()? */
14dd3ad8	226	#ifdef PERL_FLEXIBLE_EXCEPTIONS
312caa8e	227	void (je_throw)(int v); / last for bincompat */
db36c5a1	228	bool je_noset; /* no need for setjmp() */
14dd3ad8	229	#endif
1163b5c4	230	};
1163b5c4	231
6224f72b	232	typedef struct jmpenv JMPENV;
1163b5c4	233
14dd3ad8	234	#ifdef OP_IN_REGISTER
	235	#define OP_REG_TO_MEM PL_opsave = op
	236	#define OP_MEM_TO_REG op = PL_opsave
	237	#else
	238	#define OP_REG_TO_MEM NOOP
	239	#define OP_MEM_TO_REG NOOP
	240	#endif
312caa8e	241
	242	/*
	243	* How to build the first jmpenv.
	244	*
	245	* top_env needs to be non-zero. It points to an area
	246	* in which longjmp() stuff is stored, as C callstack
	247	* info there at least is thread specific this has to
	248	* be per-thread. Otherwise a 'die' in a thread gives
	249	* that thread the C stack of last thread to do an eval {}!
	250	*/
	251
	252	#define JMPENV_BOOTSTRAP \
	253	STMT_START { \
14dd3ad8	254	Zero(&PL_start_env, 1, JMPENV); \
312caa8e	255	PL_start_env.je_ret = -1; \
	256	PL_start_env.je_mustcatch = TRUE; \
	257	PL_top_env = &PL_start_env; \
	258	} STMT_END
	259
14dd3ad8	260	#ifdef PERL_FLEXIBLE_EXCEPTIONS
462e5cf6	261
312caa8e	262	/*
	263	* These exception-handling macros are split up to
	264	* ease integration with C++ exceptions.
	265	*
	266	* To use C++ try+catch to catch Perl exceptions, an extension author
	267	* needs to first write an extern "C" function to throw an appropriate
	268	* exception object; typically it will be or contain an integer,
	269	* because Perl's internals use integers to track exception types:
	270	* extern "C" { static void thrower(int i) { throw i; } }
	271	*
	272	* Then (as shown below) the author needs to use, not the simple
	273	* JMPENV_PUSH, but several of its constitutent macros, to arrange for
	274	* the Perl internals to call thrower() rather than longjmp() to
	275	* report exceptions:
	276	*
	277	* dJMPENV;
	278	* JMPENV_PUSH_INIT(thrower);
	279	* try {
	280	* ... stuff that may throw exceptions ...
	281	* }
	282	* catch (int why) { // or whatever matches thrower()
	283	* JMPENV_POST_CATCH;
	284	* EXCEPT_SET(why);
	285	* switch (why) {
	286	* ... // handle various Perl exception codes
	287	* }
	288	* }
	289	* JMPENV_POP; // don't forget this!
	290	*/
	291
14dd3ad8	292	/*
	293	* Function that catches/throws, and its callback for the
	294	* body of protected processing.
	295	*/
	296	typedef void (CPERLscope(protect_body_t)) (pTHX_ va_list);
	297	typedef void (CPERLscope(protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env,
	298	int *, protect_body_t, ...);
	299
db36c5a1	300	#define dJMPENV JMPENV cur_env; \
db36c5a1	301	volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env)
312caa8e	302
db36c5a1	303	#define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \
6224f72b	304	STMT_START { \
db36c5a1	305	(ce).je_throw = (THROWFUNC); \
	306	(ce).je_ret = -1; \
	307	(ce).je_mustcatch = FALSE; \
	308	(ce).je_prev = PL_top_env; \
	309	PL_top_env = &(ce); \
6224f72b	310	OP_REG_TO_MEM; \
312caa8e	311	} STMT_END
1d651c14	312
f2b2c1a7	313	#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV((JMPENV)pcur_env,THROWFUNC)
1d651c14	314
db36c5a1	315	#define JMPENV_POST_CATCH_ENV(ce) \
312caa8e	316	STMT_START { \
6224f72b	317	OP_MEM_TO_REG; \
db36c5a1	318	PL_top_env = &(ce); \
6224f72b	319	} STMT_END
312caa8e	320
db36c5a1	321	#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV((JMPENV)pcur_env)
1d651c14	322
db36c5a1	323	#define JMPENV_PUSH_ENV(ce,v) \
	324	STMT_START { \
	325	if (!(ce).je_noset) { \
14dd3ad8	326	DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
14dd3ad8	327	ce, PL_top_env)); \
db36c5a1	328	JMPENV_PUSH_INIT_ENV(ce,NULL); \
b03c0a3a	329	EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, SCOPE_SAVES_SIGNAL_MASK));\
db36c5a1	330	(ce).je_noset = 1; \
	331	} \
	332	else \
	333	EXCEPT_SET_ENV(ce,0); \
	334	JMPENV_POST_CATCH_ENV(ce); \
	335	(v) = EXCEPT_GET_ENV(ce); \
312caa8e	336	} STMT_END
312caa8e	337
f2b2c1a7	338	#define JMPENV_PUSH(v) JMPENV_PUSH_ENV((JMPENV)pcur_env,v)
1d651c14	339
db36c5a1	340	#define JMPENV_POP_ENV(ce) \
14dd3ad8	341	STMT_START { \
	342	if (PL_top_env == &(ce)) \
	343	PL_top_env = (ce).je_prev; \
	344	} STMT_END
312caa8e	345
f2b2c1a7	346	#define JMPENV_POP JMPENV_POP_ENV((JMPENV)pcur_env)
1d651c14	347
22921e25	348	#define JMPENV_JUMP(v) \
22921e25	349	STMT_START { \
462e5cf6	350	OP_REG_TO_MEM; \
312caa8e	351	if (PL_top_env->je_prev) { \
	352	if (PL_top_env->je_throw) \
	353	PL_top_env->je_throw(v); \
	354	else \
	355	PerlProc_longjmp(PL_top_env->je_buf, (v)); \
	356	} \
6224f72b	357	if ((v) == 2) \
312caa8e	358	PerlProc_exit(STATUS_NATIVE_EXPORT); \
bf49b057	359	PerlIO_printf(Perl_error_log, "panic: top_env\n"); \
312caa8e	360	PerlProc_exit(1); \
22921e25	361	} STMT_END
312caa8e	362
db36c5a1	363	#define EXCEPT_GET_ENV(ce) ((ce).je_ret)
	364	#define EXCEPT_GET EXCEPT_GET_ENV((JMPENV)pcur_env)
	365	#define EXCEPT_SET_ENV(ce,v) ((ce).je_ret = (v))
	366	#define EXCEPT_SET(v) EXCEPT_SET_ENV((JMPENV)pcur_env,v)
312caa8e	367
14dd3ad8	368	#else /* !PERL_FLEXIBLE_EXCEPTIONS */
	369
	370	#define dJMPENV JMPENV cur_env
	371
	372	#define JMPENV_PUSH(v) \
	373	STMT_START { \
	374	DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
	375	&cur_env, PL_top_env)); \
	376	cur_env.je_prev = PL_top_env; \
	377	OP_REG_TO_MEM; \
b03c0a3a	378	cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
14dd3ad8	379	OP_MEM_TO_REG; \
	380	PL_top_env = &cur_env; \
	381	cur_env.je_mustcatch = FALSE; \
	382	(v) = cur_env.je_ret; \
	383	} STMT_END
	384
	385	#define JMPENV_POP \
	386	STMT_START { PL_top_env = cur_env.je_prev; } STMT_END
	387
	388	#define JMPENV_JUMP(v) \
	389	STMT_START { \
	390	OP_REG_TO_MEM; \
	391	if (PL_top_env->je_prev) \
	392	PerlProc_longjmp(PL_top_env->je_buf, (v)); \
	393	if ((v) == 2) \
	394	PerlProc_exit(STATUS_NATIVE_EXPORT); \
	395	PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
	396	PerlProc_exit(1); \
	397	} STMT_END
	398
	399	#endif /* PERL_FLEXIBLE_EXCEPTIONS */
	400
db36c5a1	401	#define CATCH_GET (PL_top_env->je_mustcatch)
db36c5a1	402	#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))