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

#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 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)

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