[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 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)

#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 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

#ifdef USE_ITHREADS
#  define SAVECOPSTASH(cop)	SAVEPPTR(CopSTASHPV(cop))
#  define SAVECOPFILE(cop)	SAVEPPTR(CopFILE(cop))
#else
#  define SAVECOPSTASH(cop)	SAVESPTR(CopSTASH(cop))
#  define SAVECOPFILE(cop)	SAVESPTR(CopFILEGV(cop))
#endif

#define SAVECOPLINE(cop)	SAVEI16(CopLINE(cop))

/* 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)             save_alloc(size, 0)
#define SSNEWa(size,align)	save_alloc(size, \
    (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)

#define SSPTR(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()? */
    void		(*je_throw)(int v); /* last for bincompat */
    bool		je_noset;	/* no need for setjmp() */
};

typedef struct jmpenv JMPENV;

/*
 * 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, ...);

/*
 * 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 {				\
	PL_start_env.je_prev = NULL;		\
	PL_start_env.je_throw = NULL;		\
	PL_start_env.je_ret = -1;		\
	PL_start_env.je_mustcatch = TRUE;	\
	PL_start_env.je_noset = 0;		\
	PL_top_env = &PL_start_env;		\
    } STMT_END

#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

/*
 * 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!
 */

#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) {					\
	    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 { 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)

#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
79072805	34
3280af22	35	#define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
	36	#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
	37	#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
	38	#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
	39	#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
	40	#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
c76ac1ee	41	#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
3280af22	42	#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
	43	#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
	44	#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
	45	#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
	46	#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
c76ac1ee	47	#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
8990e307	48
3280af22	49	#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
3280af22	50	#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
a0d0e21e	51
f46d017c	52	#ifdef DEBUGGING
	53	#define ENTER \
	54	STMT_START { \
	55	push_scope(); \
cea2e8a9	56	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \
3280af22	57	PL_scopestack_ix, __FILE__, __LINE__))); \
f46d017c	58	} STMT_END
	59	#define LEAVE \
	60	STMT_START { \
cea2e8a9	61	DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \
3280af22	62	PL_scopestack_ix, __FILE__, __LINE__))); \
f46d017c	63	pop_scope(); \
	64	} STMT_END
	65	#else
a0d0e21e	66	#define ENTER push_scope()
a0d0e21e	67	#define LEAVE pop_scope()
f46d017c	68	#endif
3280af22	69	#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
a0d0e21e	70
55497cff	71	/*
b9d12d37	72	* Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
55497cff	73	* because these are used for several kinds of pointer values
55497cff	74	*/
e8347627	75	#define SAVEI8(i) save_I8(SOFT_CAST(I8*)&(i))
4fdae800	76	#define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i))
	77	#define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i))
	78	#define SAVEINT(i) save_int(SOFT_CAST(int*)&(i))
	79	#define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i))
	80	#define SAVELONG(l) save_long(SOFT_CAST(long*)&(l))
55497cff	81	#define SAVESPTR(s) save_sptr((SV**)&(s))
55497cff	82	#define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s))
57b2e452	83	#define SAVEVPTR(s) save_vptr((void*)&(s))
55497cff	84	#define SAVEFREESV(s) save_freesv((SV*)(s))
	85	#define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o))
	86	#define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p))
	87	#define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv))
b9d12d37	88	#define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
55497cff	89	#define SAVEDELETE(h,k,l) \
	90	save_delete(SOFT_CAST(HV)(h), SOFT_CAST(char)(k), (I32)(l))
	91	#define SAVEDESTRUCTOR(f,p) \
c76ac1ee	92	save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p))
	93
	94	#define SAVEDESTRUCTOR_X(f,p) \
	95	save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p))
25eaa213	96
	97	#define SAVESTACK_POS() \
	98	STMT_START { \
	99	SSCHECK(2); \
3280af22	100	SSPUSHINT(PL_stack_sp - PL_stack_base); \
25eaa213	101	SSPUSHINT(SAVEt_STACK_POS); \
	102	} STMT_END
	103
462e5cf6	104	#define SAVEOP() save_op()
25eaa213	105
	106	#define SAVEHINTS() \
	107	STMT_START { \
3280af22	108	if (PL_hints & HINT_LOCALIZE_HH) \
25eaa213	109	save_hints(); \
	110	else { \
	111	SSCHECK(2); \
3280af22	112	SSPUSHINT(PL_hints); \
25eaa213	113	SSPUSHINT(SAVEt_HINTS); \
	114	} \
	115	} STMT_END
a9332b4a	116
57843af0	117	#ifdef USE_ITHREADS
11faa288	118	# define SAVECOPSTASH(cop) SAVEPPTR(CopSTASHPV(cop))
57843af0	119	# define SAVECOPFILE(cop) SAVEPPTR(CopFILE(cop))
57843af0	120	#else
11faa288	121	# define SAVECOPSTASH(cop) SAVESPTR(CopSTASH(cop))
57843af0	122	# define SAVECOPFILE(cop) SAVESPTR(CopFILEGV(cop))
	123	#endif
	124
	125	#define SAVECOPLINE(cop) SAVEI16(CopLINE(cop))
	126
455ece5e	127	/* SSNEW() temporarily allocates a specified number of bytes of data on the
	128	* savestack. It returns an integer index into the savestack, because a
	129	* pointer would get broken if the savestack is moved on reallocation.
	130	* SSNEWa() works like SSNEW(), but also aligns the data to the specified
	131	* number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
	132	* alignment will be preserved therough savestack reallocation only if
	133	* realloc returns data aligned to a size divisible by `align'!
	134	*
	135	* SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
	136	*/
	137
	138	#define SSNEW(size) save_alloc(size, 0)
	139	#define SSNEWa(size,align) save_alloc(size, \
	140	(align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
	141
	142	#define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
	143
54310121	144	/* A jmpenv packages the state required to perform a proper non-local jump.
	145	* Note that there is a start_env initialized when perl starts, and top_env
	146	* points to this initially, so top_env should always be non-null.
	147	*
	148	* Existence of a non-null top_env->je_prev implies it is valid to call
6224f72b	149	* longjmp() at that runlevel (we make sure start_env.je_prev is always
6224f72b	150	* null to ensure this).
54310121	151	*
	152	* je_mustcatch, when set at any runlevel to TRUE, means eval ops must
	153	* establish a local jmpenv to handle exception traps. Care must be taken
	154	* to restore the previous value of je_mustcatch before exiting the
	155	* stack frame iff JMPENV_PUSH was not called in that stack frame.
6224f72b	156	* GSAR 97-03-27
54310121	157	*/
	158
	159	struct jmpenv {
	160	struct jmpenv * je_prev;
312caa8e	161	Sigjmp_buf je_buf; /* only for use if !je_throw */
	162	int je_ret; /* last exception thrown */
	163	bool je_mustcatch; /* need to call longjmp()? */
	164	void (je_throw)(int v); / last for bincompat */
db36c5a1	165	bool je_noset; /* no need for setjmp() */
1163b5c4	166	};
1163b5c4	167
6224f72b	168	typedef struct jmpenv JMPENV;
1163b5c4	169
312caa8e	170	/*
	171	* Function that catches/throws, and its callback for the
	172	* body of protected processing.
	173	*/
cea2e8a9	174	typedef void (CPERLscope(protect_body_t)) (pTHX_ va_list);
db36c5a1	175	typedef void (CPERLscope(protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env,
db36c5a1	176	int *, protect_body_t, ...);
312caa8e	177
	178	/*
	179	* How to build the first jmpenv.
	180	*
	181	* top_env needs to be non-zero. It points to an area
	182	* in which longjmp() stuff is stored, as C callstack
	183	* info there at least is thread specific this has to
	184	* be per-thread. Otherwise a 'die' in a thread gives
	185	* that thread the C stack of last thread to do an eval {}!
	186	*/
	187
	188	#define JMPENV_BOOTSTRAP \
	189	STMT_START { \
	190	PL_start_env.je_prev = NULL; \
	191	PL_start_env.je_throw = NULL; \
	192	PL_start_env.je_ret = -1; \
	193	PL_start_env.je_mustcatch = TRUE; \
db36c5a1	194	PL_start_env.je_noset = 0; \
312caa8e	195	PL_top_env = &PL_start_env; \
	196	} STMT_END
	197
462e5cf6	198	#ifdef OP_IN_REGISTER
6b88bc9c	199	#define OP_REG_TO_MEM PL_opsave = op
6b88bc9c	200	#define OP_MEM_TO_REG op = PL_opsave
462e5cf6	201	#else
	202	#define OP_REG_TO_MEM NOOP
	203	#define OP_MEM_TO_REG NOOP
	204	#endif
	205
312caa8e	206	/*
	207	* These exception-handling macros are split up to
	208	* ease integration with C++ exceptions.
	209	*
	210	* To use C++ try+catch to catch Perl exceptions, an extension author
	211	* needs to first write an extern "C" function to throw an appropriate
	212	* exception object; typically it will be or contain an integer,
	213	* because Perl's internals use integers to track exception types:
	214	* extern "C" { static void thrower(int i) { throw i; } }
	215	*
	216	* Then (as shown below) the author needs to use, not the simple
	217	* JMPENV_PUSH, but several of its constitutent macros, to arrange for
	218	* the Perl internals to call thrower() rather than longjmp() to
	219	* report exceptions:
	220	*
	221	* dJMPENV;
	222	* JMPENV_PUSH_INIT(thrower);
	223	* try {
	224	* ... stuff that may throw exceptions ...
	225	* }
	226	* catch (int why) { // or whatever matches thrower()
	227	* JMPENV_POST_CATCH;
	228	* EXCEPT_SET(why);
	229	* switch (why) {
	230	* ... // handle various Perl exception codes
	231	* }
	232	* }
	233	* JMPENV_POP; // don't forget this!
	234	*/
	235
db36c5a1	236	#define dJMPENV JMPENV cur_env; \
db36c5a1	237	volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env)
312caa8e	238
db36c5a1	239	#define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \
6224f72b	240	STMT_START { \
db36c5a1	241	(ce).je_throw = (THROWFUNC); \
	242	(ce).je_ret = -1; \
	243	(ce).je_mustcatch = FALSE; \
	244	(ce).je_prev = PL_top_env; \
	245	PL_top_env = &(ce); \
6224f72b	246	OP_REG_TO_MEM; \
312caa8e	247	} STMT_END
1d651c14	248
db36c5a1	249	#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV((JMPENV)pcur_env,THROWFUNC)
1d651c14	250
db36c5a1	251	#define JMPENV_POST_CATCH_ENV(ce) \
312caa8e	252	STMT_START { \
6224f72b	253	OP_MEM_TO_REG; \
db36c5a1	254	PL_top_env = &(ce); \
6224f72b	255	} STMT_END
312caa8e	256
db36c5a1	257	#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV((JMPENV)pcur_env)
1d651c14	258
1d651c14	259
db36c5a1	260	#define JMPENV_PUSH_ENV(ce,v) \
	261	STMT_START { \
	262	if (!(ce).je_noset) { \
	263	JMPENV_PUSH_INIT_ENV(ce,NULL); \
	264	EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, 1));\
	265	(ce).je_noset = 1; \
	266	} \
	267	else \
	268	EXCEPT_SET_ENV(ce,0); \
	269	JMPENV_POST_CATCH_ENV(ce); \
	270	(v) = EXCEPT_GET_ENV(ce); \
312caa8e	271	} STMT_END
312caa8e	272
db36c5a1	273	#define JMPENV_PUSH(v) JMPENV_PUSH_ENV((JMPENV)pcur_env,v)
1d651c14	274
db36c5a1	275	#define JMPENV_POP_ENV(ce) \
db36c5a1	276	STMT_START { PL_top_env = (ce).je_prev; } STMT_END
312caa8e	277
db36c5a1	278	#define JMPENV_POP JMPENV_POP_ENV((JMPENV)pcur_env)
1d651c14	279
22921e25	280	#define JMPENV_JUMP(v) \
22921e25	281	STMT_START { \
462e5cf6	282	OP_REG_TO_MEM; \
312caa8e	283	if (PL_top_env->je_prev) { \
	284	if (PL_top_env->je_throw) \
	285	PL_top_env->je_throw(v); \
	286	else \
	287	PerlProc_longjmp(PL_top_env->je_buf, (v)); \
	288	} \
6224f72b	289	if ((v) == 2) \
312caa8e	290	PerlProc_exit(STATUS_NATIVE_EXPORT); \
bf49b057	291	PerlIO_printf(Perl_error_log, "panic: top_env\n"); \
312caa8e	292	PerlProc_exit(1); \
22921e25	293	} STMT_END
312caa8e	294
db36c5a1	295	#define EXCEPT_GET_ENV(ce) ((ce).je_ret)
	296	#define EXCEPT_GET EXCEPT_GET_ENV((JMPENV)pcur_env)
	297	#define EXCEPT_SET_ENV(ce,v) ((ce).je_ret = (v))
	298	#define EXCEPT_SET(v) EXCEPT_SET_ENV((JMPENV)pcur_env,v)
312caa8e	299
db36c5a1	300	#define CATCH_GET (PL_top_env->je_mustcatch)
db36c5a1	301	#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))