[p5sagit/p5-mst-13.2.git] / ext / Opcode / Opcode.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

/* maxo shouldn't differ from MAXO but leave room anyway (see BOOT:)	*/
#define OP_MASK_BUF_SIZE (MAXO + 100)

static HV *op_named_bits;	/* cache shared for whole process	*/
static SV *opset_all;		/* mask with all bits set		*/
static IV  opset_len;		/* length of opmasks in bytes		*/
static int opcode_debug = 0;

static SV  *new_opset _((SV *old_opset));
static int  verify_opset _((SV *opset, int fatal));
static void set_opset_bits _((char *bitmap, SV *bitspec, int on, char *opname));
static void put_op_bitspec _((char *optag,  STRLEN len, SV *opset));
static SV  *get_op_bitspec _((char *opname, STRLEN len, int fatal));


/* Initialise our private op_named_bits HV.
 * It is first loaded with the name and number of each perl operator.
 * Then the builtin tags :none and :all are added.
 * Opcode.pm loads the standard optags from __DATA__
 */

static void
op_names_init()
{
    int i;
    STRLEN len;
    char *opname;
    char *bitmap;

    op_named_bits = newHV();
    for(i=0; i < maxo; ++i) {
	SV *sv;
	sv = newSViv(i);
	SvREADONLY_on(sv);
	hv_store(op_named_bits, op_name[i], strlen(op_name[i]), sv, 0);
    }

    put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));

    opset_all = new_opset(Nullsv);
    bitmap = SvPV(opset_all, len);
    i = len-1; /* deal with last byte specially, see below */
    while(i-- > 0)
	bitmap[i] = 0xFF;
    /* Take care to set the right number of bits in the last byte */
    bitmap[len-1] = (maxo & 0x07) ? ~(0xFF << (maxo & 0x07)) : 0xFF;
    put_op_bitspec(":all",0, opset_all); /* don't mortalise */
}


/* Store a new tag definition. Always a mask.
 * The tag must not already be defined.
 * SV *mask is copied not referenced.
 */

static void
put_op_bitspec(optag, len, mask)
    char *optag;
    STRLEN len;
    SV *mask;
{
    SV **svp;
    verify_opset(mask,1);
    if (!len)
	len = strlen(optag);
    svp = hv_fetch(op_named_bits, optag, len, 1);
    if (SvOK(*svp))
	croak("Opcode tag \"%s\" already defined", optag);
    sv_setsv(*svp, mask);
    SvREADONLY_on(*svp);
}


/* Fetch a 'bits' entry for an opname or optag (IV/PV).
 * Note that we return the actual entry for speed.
 * Always sv_mortalcopy() if returing it to user code.
 */

static SV *
get_op_bitspec(opname, len, fatal)
    char *opname;
    STRLEN len;
    int fatal;
{
    SV **svp;
    if (!len)
	len = strlen(opname);
    svp = hv_fetch(op_named_bits, opname, len, 0);
    if (!svp || !SvOK(*svp)) {
	if (!fatal)
	    return Nullsv;
	if (*opname == ':')
	    croak("Unknown operator tag \"%s\"", opname);
	if (*opname == '!')	/* XXX here later, or elsewhere? */
	    croak("Can't negate operators here (\"%s\")", opname);
	if (isALPHA(*opname))
	    croak("Unknown operator name \"%s\"", opname);
	croak("Unknown operator prefix \"%s\"", opname);
    }
    return *svp;
}


static SV *
new_opset(old_opset)
    SV *old_opset;
{
    SV *opset;
    if (old_opset) {
	verify_opset(old_opset,1);
	opset = newSVsv(old_opset);
    }
    else {
	opset = newSV(opset_len);
	Zero(SvPVX(opset), opset_len + 1, char);
	SvCUR_set(opset, opset_len);
	(void)SvPOK_only(opset);
    }
    /* not mortalised here */
    return opset;
}


static int
verify_opset(opset, fatal)
    SV *opset;
    int fatal;
{
    char *err = Nullch;
    if      (!SvOK(opset))              err = "undefined";
    else if (!SvPOK(opset))             err = "wrong type";
    else if (SvCUR(opset) != opset_len) err = "wrong size";
    if (err && fatal) {
	croak("Invalid opset: %s", err);
    }
    return !err;
}


static void
set_opset_bits(bitmap, bitspec, on, opname)
    char *bitmap;
    SV *bitspec;
    int on;
    char *opname;
{
    if (SvIOK(bitspec)) {
	int myopcode = SvIV(bitspec);
	int offset = myopcode >> 3;
	int bit    = myopcode & 0x07;
	if (myopcode >= maxo || myopcode < 0)
	    croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
	if (opcode_debug >= 2)
	    warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
			myopcode, offset, bit, opname, (on)?"on":"off");
	if (on)
	    bitmap[offset] |= 1 << bit;
	else
	    bitmap[offset] &= ~(1 << bit);
    }
    else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {

	STRLEN len;
	char *specbits = SvPV(bitspec, len);
	if (opcode_debug >= 2)
	    warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
	if (on) 
	    while(len-- > 0) bitmap[len] |=  specbits[len];
	else
	    while(len-- > 0) bitmap[len] &= ~specbits[len];
    }
    else
	croak("panic: invalid bitspec for \"%s\" (type %u)",
		opname, (unsigned)SvTYPE(bitspec));
}


static void
opmask_add(opset)	/* THE ONLY FUNCTION TO EDIT op_mask ITSELF	*/
    SV *opset;
{
    int i,j;
    char *bitmask;
    STRLEN len;
    int myopcode = 0;

    verify_opset(opset,1);			/* croaks on bad opset	*/

    if (!op_mask)		/* caller must ensure op_mask exists	*/
	croak("Can't add to uninitialised op_mask");

    /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal()	*/

    bitmask = SvPV(opset, len);
    for (i=0; i < opset_len; i++) {
	U16 bits = bitmask[i];
	if (!bits) {	/* optimise for sparse masks */
	    myopcode += 8;
	    continue;
	}
	for (j=0; j < 8 && myopcode < maxo; )
	    op_mask[myopcode++] |= bits & (1 << j++);
    }
}

static void
opmask_addlocal(opset, op_mask_buf) /* Localise op_mask then opmask_add() */
    SV *opset;
    char *op_mask_buf;
{
    char *orig_op_mask = op_mask;
    SAVEPPTR(op_mask);
    if (opcode_debug >= 2)
	SAVEDESTRUCTOR((void(*)_((void*)))warn,"op_mask restored");
    op_mask = &op_mask_buf[0];
    if (orig_op_mask)
	Copy(orig_op_mask, op_mask, maxo, char);
    else
	Zero(op_mask, maxo, char);
    opmask_add(opset);
}


MODULE = Opcode	PACKAGE = Opcode

PROTOTYPES: ENABLE

BOOT:
    assert(maxo < OP_MASK_BUF_SIZE);
    opset_len = (maxo + 7) / 8;
    if (opcode_debug >= 1)
	warn("opset_len %ld\n", (long)opset_len);
    op_names_init();


void
_safe_call_sv(package, mask, codesv)
    char *	package
    SV *	mask
    SV *	codesv
    PPCODE:
    char op_mask_buf[OP_MASK_BUF_SIZE];
    GV *gv;

    ENTER;

    opmask_addlocal(mask, op_mask_buf);

    save_aptr(&endav);
    endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now	*/

    save_hptr(&defstash);		/* save current default stack	*/
    /* the assignment to global defstash changes our sense of 'main'	*/
    defstash = gv_stashpv(package, GV_ADDWARN); /* should exist already	*/

    /* defstash must itself contain a main:: so we'll add that now	*/
    /* take care with the ref counts (was cause of long standing bug)	*/
    /* XXX I'm still not sure if this is right, GV_ADDWARN should warn!	*/
    gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
    sv_free((SV*)GvHV(gv));
    GvHV(gv) = (HV*)SvREFCNT_inc(defstash);

    PUSHMARK(sp);
    perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
    SPAGAIN; /* for the PUTBACK added by xsubpp */
    LEAVE;


int
verify_opset(opset, fatal = 0)
    SV *opset
    int fatal


void
invert_opset(opset)
    SV *opset
    CODE:
    {
    char *bitmap;
    STRLEN len = opset_len;
    opset = new_opset(opset);	/* verify and clone opset */
    bitmap = SvPVX(opset);
    while(len-- > 0)
	bitmap[len] = ~bitmap[len];
    /* take care of extra bits beyond maxo in last byte	*/
    if (maxo & 07)
	bitmap[opset_len-1] &= ~(0xFF << (maxo & 0x07));
    }
    ST(0) = opset;


void
opset_to_ops(opset, desc = 0)
    SV *opset
    int	desc
    PPCODE:
    {
    STRLEN len;
    int i, j, myopcode;
    char *bitmap = SvPV(opset, len);
    char **names = (desc) ? op_desc : op_name;
    verify_opset(opset,1);
    for (myopcode=0, i=0; i < opset_len; i++) {
	U16 bits = bitmap[i];
	for (j=0; j < 8 && myopcode < maxo; j++, myopcode++) {
	    if ( bits & (1 << j) )
		XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
	}
    }
    }


void
opset(...)
    CODE:
    int i, j;
    SV *bitspec, *opset;
    char *bitmap;
    STRLEN len, on;
    opset = new_opset(Nullsv);
    bitmap = SvPVX(opset);
    for (i = 0; i < items; i++) {
	char *opname;
	on = 1;
	if (verify_opset(ST(i),0)) {
	    opname = "(opset)";
	    bitspec = ST(i);
	}
	else {
	    opname = SvPV(ST(i), len);
	    if (*opname == '!') { on=0; ++opname;--len; }
	    bitspec = get_op_bitspec(opname, len, 1);
	}
	set_opset_bits(bitmap, bitspec, on, opname);
    }
    ST(0) = opset;


#define PERMITING  (ix == 0 || ix == 1)
#define ONLY_THESE (ix == 0 || ix == 2)

void
permit_only(safe, ...)
    SV *safe
    ALIAS:
	permit    = 1
	deny_only = 2
	deny      = 3
    CODE:
    int i, on;
    SV *bitspec, *mask;
    char *bitmap, *opname;
    STRLEN len;

    if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV)
	croak("Not a Safe object");
    mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1);
    if (ONLY_THESE)	/* *_only = new mask, else edit current	*/
	 sv_setsv(mask, new_opset(PERMITING ? opset_all : Nullsv));
    else verify_opset(mask,1); /* croaks */
    bitmap = SvPVX(mask);
    for (i = 1; i < items; i++) {
	on = PERMITING ? 0 : 1;		/* deny = mask bit on	*/
	if (verify_opset(ST(i),0)) {	/* it's a valid mask	*/
	    opname = "(opset)";
	    bitspec = ST(i);
	}
	else {				/* it's an opname/optag	*/
	    opname = SvPV(ST(i), len);
	    /* invert if op has ! prefix (only one allowed)	*/
	    if (*opname == '!') { on = !on; ++opname; --len; }
	    bitspec = get_op_bitspec(opname, len, 1); /* croaks */
	}
	set_opset_bits(bitmap, bitspec, on, opname);
    }
    ST(0) = &sv_yes;


void
opdesc(...)
    PPCODE:
    int i, myopcode;
    STRLEN len;
    SV **args;
    /* copy args to a scratch area since we may push output values onto	*/
    /* the stack faster than we read values off it if masks are used.	*/
    args = (SV**)SvPVX(sv_2mortal(newSVpv((char*)&ST(0), items*sizeof(SV*))));
    for (i = 0; i < items; i++) {
	char *opname = SvPV(args[i], len);
	SV *bitspec = get_op_bitspec(opname, len, 1);
	if (SvIOK(bitspec)) {
	    myopcode = SvIV(bitspec);
	    if (myopcode < 0 || myopcode >= maxo)
		croak("panic: opcode %d (%s) out of range",myopcode,opname);
	    XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	}
	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
	    int b, j;
	    char *bitmap = SvPV(bitspec,na);
	    myopcode = 0;
	    for (b=0; b < opset_len; b++) {
		U16 bits = bitmap[b];
		for (j=0; j < 8 && myopcode < maxo; j++, myopcode++)
		    if (bits & (1 << j))
			XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	    }
	}
	else
	    croak("panic: invalid bitspec for \"%s\" (type %u)",
		opname, (unsigned)SvTYPE(bitspec));
    }


void
define_optag(optagsv, mask)
    SV *optagsv
    SV *mask
    CODE:
    STRLEN len;
    char *optag = SvPV(optagsv, len);
    put_op_bitspec(optag, len, mask); /* croaks */
    ST(0) = &sv_yes;


void
empty_opset()
    CODE:
    ST(0) = sv_2mortal(new_opset(Nullsv));

void
full_opset()
    CODE:
    ST(0) = sv_2mortal(new_opset(opset_all));

void
opmask_add(opset)
    SV *opset
    PREINIT:
    if (!op_mask)
	Newz(0, op_mask, maxo, char);

void
opcodes()
    PPCODE:
    if (GIMME == G_ARRAY) {
	croak("opcodes in list context not yet implemented"); /* XXX */
    }
    else {
	XPUSHs(sv_2mortal(newSViv(maxo)));
    }

void
opmask()
    CODE:
    ST(0) = sv_2mortal(new_opset(Nullsv));
    if (op_mask) {
	char *bitmap = SvPVX(ST(0));
	int myopcode;
	for(myopcode=0; myopcode < maxo; ++myopcode) {
	    if (op_mask[myopcode])
		bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);
	}
    }
Commit	Line	Data
6badd1a5	1	#include "EXTERN.h"
	2	#include "perl.h"
	3	#include "XSUB.h"
	4
	5	/* maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
	6	#define OP_MASK_BUF_SIZE (MAXO + 100)
	7
	8	static HV op_named_bits; / cache shared for whole process */
	9	static SV opset_all; / mask with all bits set */
	10	static IV opset_len; /* length of opmasks in bytes */
	11	static int opcode_debug = 0;
	12
	13	static SV new_opset _((SV old_opset));
	14	static int verify_opset _((SV *opset, int fatal));
	15	static void set_opset_bits _((char bitmap, SV bitspec, int on, char *opname));
	16	static void put_op_bitspec _((char optag, STRLEN len, SV opset));
	17	static SV get_op_bitspec _((char opname, STRLEN len, int fatal));
	18
	19
	20	/* Initialise our private op_named_bits HV.
	21	* It is first loaded with the name and number of each perl operator.
	22	* Then the builtin tags :none and :all are added.
	23	* Opcode.pm loads the standard optags from __DATA__
	24	*/
	25
	26	static void
	27	op_names_init()
	28	{
	29	int i;
	30	STRLEN len;
	31	char *opname;
	32	char *bitmap;
	33
	34	op_named_bits = newHV();
	35	for(i=0; i < maxo; ++i) {
e858de61	36	SV *sv;
	37	sv = newSViv(i);
	38	SvREADONLY_on(sv);
	39	hv_store(op_named_bits, op_name[i], strlen(op_name[i]), sv, 0);
6badd1a5	40	}
	41
	42	put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));
	43
	44	opset_all = new_opset(Nullsv);
	45	bitmap = SvPV(opset_all, len);
	46	i = len-1; /* deal with last byte specially, see below */
	47	while(i-- > 0)
	48	bitmap[i] = 0xFF;
	49	/* Take care to set the right number of bits in the last byte */
8903cb82	50	bitmap[len-1] = (maxo & 0x07) ? ~(0xFF << (maxo & 0x07)) : 0xFF;
6badd1a5	51	put_op_bitspec(":all",0, opset_all); /* don't mortalise */
	52	}
	53
	54
	55	/* Store a new tag definition. Always a mask.
	56	* The tag must not already be defined.
	57	* SV *mask is copied not referenced.
	58	*/
	59
	60	static void
	61	put_op_bitspec(optag, len, mask)
	62	char *optag;
	63	STRLEN len;
	64	SV *mask;
	65	{
	66	SV **svp;
	67	verify_opset(mask,1);
	68	if (!len)
	69	len = strlen(optag);
	70	svp = hv_fetch(op_named_bits, optag, len, 1);
	71	if (SvOK(*svp))
	72	croak("Opcode tag \"%s\" already defined", optag);
	73	sv_setsv(*svp, mask);
	74	SvREADONLY_on(*svp);
	75	}
	76
	77
	78
	79	/* Fetch a 'bits' entry for an opname or optag (IV/PV).
	80	* Note that we return the actual entry for speed.
	81	* Always sv_mortalcopy() if returing it to user code.
	82	*/
	83
	84	static SV *
	85	get_op_bitspec(opname, len, fatal)
	86	char *opname;
	87	STRLEN len;
	88	int fatal;
	89	{
	90	SV **svp;
	91	if (!len)
	92	len = strlen(opname);
	93	svp = hv_fetch(op_named_bits, opname, len, 0);
	94	if (!svp \|\| !SvOK(*svp)) {
	95	if (!fatal)
	96	return Nullsv;
	97	if (*opname == ':')
	98	croak("Unknown operator tag \"%s\"", opname);
	99	if (opname == '!') / XXX here later, or elsewhere? */
	100	croak("Can't negate operators here (\"%s\")", opname);
	101	if (isALPHA(*opname))
	102	croak("Unknown operator name \"%s\"", opname);
	103	croak("Unknown operator prefix \"%s\"", opname);
	104	}
	105	return *svp;
	106	}
	107
	108
	109
	110	static SV *
	111	new_opset(old_opset)
	112	SV *old_opset;
	113	{
	114	SV *opset;
115	if (old_opset) {
116	verify_opset(old_opset,1);
117	opset = newSVsv(old_opset);
118	}
119	else {
120	opset = newSV(opset_len);
67a5ea69	121	Zero(SvPVX(opset), opset_len + 1, char);
6badd1a5	122	SvCUR_set(opset, opset_len);
	123	(void)SvPOK_only(opset);
	124	}
	125	/* not mortalised here */
	126	return opset;
	127	}
	128
	129
	130	static int
	131	verify_opset(opset, fatal)
	132	SV *opset;
	133	int fatal;
	134	{
	135	char *err = Nullch;
	136	if (!SvOK(opset)) err = "undefined";
	137	else if (!SvPOK(opset)) err = "wrong type";
	138	else if (SvCUR(opset) != opset_len) err = "wrong size";
	139	if (err && fatal) {
	140	croak("Invalid opset: %s", err);
	141	}
	142	return !err;
	143	}
	144
	145
	146	static void
	147	set_opset_bits(bitmap, bitspec, on, opname)
	148	char *bitmap;
	149	SV *bitspec;
	150	int on;
	151	char *opname;
	152	{
	153	if (SvIOK(bitspec)) {
	154	int myopcode = SvIV(bitspec);
	155	int offset = myopcode >> 3;
	156	int bit = myopcode & 0x07;
	157	if (myopcode >= maxo \|\| myopcode < 0)
	158	croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
	159	if (opcode_debug >= 2)
ff0cee69	160	warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
6badd1a5	161	myopcode, offset, bit, opname, (on)?"on":"off");
	162	if (on)
	163	bitmap[offset] \|= 1 << bit;
	164	else
	165	bitmap[offset] &= ~(1 << bit);
	166	}
	167	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
	168
	169	STRLEN len;
	170	char *specbits = SvPV(bitspec, len);
	171	if (opcode_debug >= 2)
	172	warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
	173	if (on)
	174	while(len-- > 0) bitmap[len] \|= specbits[len];
	175	else
	176	while(len-- > 0) bitmap[len] &= ~specbits[len];
	177	}
	178	else
ff0cee69	179	croak("panic: invalid bitspec for \"%s\" (type %u)",
ff0cee69	180	opname, (unsigned)SvTYPE(bitspec));
6badd1a5	181	}
	182
	183
	184	static void
	185	opmask_add(opset) /* THE ONLY FUNCTION TO EDIT op_mask ITSELF */
	186	SV *opset;
	187	{
	188	int i,j;
	189	char *bitmask;
	190	STRLEN len;
	191	int myopcode = 0;
	192
	193	verify_opset(opset,1); /* croaks on bad opset */
	194
	195	if (!op_mask) /* caller must ensure op_mask exists */
	196	croak("Can't add to uninitialised op_mask");
	197
	198	/* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
	199
	200	bitmask = SvPV(opset, len);
	201	for (i=0; i < opset_len; i++) {
	202	U16 bits = bitmask[i];
	203	if (!bits) { /* optimise for sparse masks */
	204	myopcode += 8;
	205	continue;
	206	}
	207	for (j=0; j < 8 && myopcode < maxo; )
	208	op_mask[myopcode++] \|= bits & (1 << j++);
	209	}
	210	}
	211
	212	static void
	213	opmask_addlocal(opset, op_mask_buf) /* Localise op_mask then opmask_add() */
	214	SV *opset;
	215	char *op_mask_buf;
	216	{
	217	char *orig_op_mask = op_mask;
	218	SAVEPPTR(op_mask);
	219	if (opcode_debug >= 2)
	220	SAVEDESTRUCTOR((void()_((void)))warn,"op_mask restored");
	221	op_mask = &op_mask_buf[0];
	222	if (orig_op_mask)
	223	Copy(orig_op_mask, op_mask, maxo, char);
	224	else
	225	Zero(op_mask, maxo, char);
	226	opmask_add(opset);
	227	}
	228
	229
	230
	231	MODULE = Opcode PACKAGE = Opcode
	232
	233	PROTOTYPES: ENABLE
	234
	235	BOOT:
	236	assert(maxo < OP_MASK_BUF_SIZE);
760ac839	237	opset_len = (maxo + 7) / 8;
6badd1a5	238	if (opcode_debug >= 1)
ff0cee69	239	warn("opset_len %ld\n", (long)opset_len);
6badd1a5	240	op_names_init();
	241
	242
	243	void
	244	_safe_call_sv(package, mask, codesv)
	245	char * package
	246	SV * mask
	247	SV * codesv
	248	PPCODE:
	249	char op_mask_buf[OP_MASK_BUF_SIZE];
	250	GV *gv;
	251
	252	ENTER;
	253
	254	opmask_addlocal(mask, op_mask_buf);
	255
	256	save_aptr(&endav);
	257	endav = (AV)sv_2mortal((SV)newAV()); /* ignore END blocks for now */
	258
	259	save_hptr(&defstash); /* save current default stack */
	260	/* the assignment to global defstash changes our sense of 'main' */
	261	defstash = gv_stashpv(package, GV_ADDWARN); /* should exist already */
	262
	263	/* defstash must itself contain a main:: so we'll add that now */
	264	/* take care with the ref counts (was cause of long standing bug) */
	265	/* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
	266	gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
	267	sv_free((SV*)GvHV(gv));
	268	GvHV(gv) = (HV*)SvREFCNT_inc(defstash);
	269
	270	PUSHMARK(sp);
	271	perl_call_sv(codesv, GIMME\|G_EVAL\|G_KEEPERR); /* use callers context */
	272	SPAGAIN; /* for the PUTBACK added by xsubpp */
	273	LEAVE;
	274
	275
	276	int
	277	verify_opset(opset, fatal = 0)
	278	SV *opset
	279	int fatal
	280
	281
	282	void
	283	invert_opset(opset)
	284	SV *opset
	285	CODE:
	286	{
	287	char *bitmap;
	288	STRLEN len = opset_len;
	289	opset = new_opset(opset); /* verify and clone opset */
	290	bitmap = SvPVX(opset);
	291	while(len-- > 0)
	292	bitmap[len] = ~bitmap[len];
	293	/* take care of extra bits beyond maxo in last byte */
8903cb82	294	if (maxo & 07)
8903cb82	295	bitmap[opset_len-1] &= ~(0xFF << (maxo & 0x07));
6badd1a5	296	}
	297	ST(0) = opset;
	298
	299
	300	void
	301	opset_to_ops(opset, desc = 0)
	302	SV *opset
	303	int desc
	304	PPCODE:
	305	{
	306	STRLEN len;
	307	int i, j, myopcode;
	308	char *bitmap = SvPV(opset, len);
	309	char **names = (desc) ? op_desc : op_name;
	310	verify_opset(opset,1);
	311	for (myopcode=0, i=0; i < opset_len; i++) {
	312	U16 bits = bitmap[i];
	313	for (j=0; j < 8 && myopcode < maxo; j++, myopcode++) {
	314	if ( bits & (1 << j) )
	315	XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
	316	}
	317	}
	318	}
	319
	320
	321	void
	322	opset(...)
	323	CODE:
	324	int i, j;
	325	SV bitspec, opset;
	326	char *bitmap;
	327	STRLEN len, on;
	328	opset = new_opset(Nullsv);
	329	bitmap = SvPVX(opset);
	330	for (i = 0; i < items; i++) {
	331	char *opname;
	332	on = 1;
	333	if (verify_opset(ST(i),0)) {
	334	opname = "(opset)";
	335	bitspec = ST(i);
	336	}
	337	else {
	338	opname = SvPV(ST(i), len);
	339	if (*opname == '!') { on=0; ++opname;--len; }
	340	bitspec = get_op_bitspec(opname, len, 1);
	341	}
	342	set_opset_bits(bitmap, bitspec, on, opname);
	343	}
	344	ST(0) = opset;
	345
	346
	347	#define PERMITING (ix == 0 \|\| ix == 1)
	348	#define ONLY_THESE (ix == 0 \|\| ix == 2)
	349
	350	void
	351	permit_only(safe, ...)
	352	SV *safe
	353	ALIAS:
	354	permit = 1
	355	deny_only = 2
	356	deny = 3
	357	CODE:
	358	int i, on;
	359	SV bitspec, mask;
360	char bitmap, opname;
361	STRLEN len;
362
363	if (!SvROK(safe) \|\| !SvOBJECT(SvRV(safe)) \|\| SvTYPE(SvRV(safe))!=SVt_PVHV)
364	croak("Not a Safe object");
365	mask = hv_fetch((HV)SvRV(safe), "Mask",4, 1);
366	if (ONLY_THESE) /* _only = new mask, else edit current /
367	sv_setsv(mask, new_opset(PERMITING ? opset_all : Nullsv));
368	else verify_opset(mask,1); /* croaks */
369	bitmap = SvPVX(mask);
370	for (i = 1; i < items; i++) {
371	on = PERMITING ? 0 : 1; /* deny = mask bit on */
372	if (verify_opset(ST(i),0)) { /* it's a valid mask */
373	opname = "(opset)";
374	bitspec = ST(i);
375	}
376	else { /* it's an opname/optag */
377	opname = SvPV(ST(i), len);
378	/* invert if op has ! prefix (only one allowed) */
379	if (*opname == '!') { on = !on; ++opname; --len; }
380	bitspec = get_op_bitspec(opname, len, 1); /* croaks */
381	}
382	set_opset_bits(bitmap, bitspec, on, opname);
383	}
384	ST(0) = &sv_yes;
385
386
387
388	void
389	opdesc(...)
390	PPCODE:
391	int i, myopcode;
392	STRLEN len;
393	SV **args;
394	/* copy args to a scratch area since we may push output values onto */
395	/* the stack faster than we read values off it if masks are used. */
396	args = (SV*)SvPVX(sv_2mortal(newSVpv((char)&ST(0), itemssizeof(SV))));
397	for (i = 0; i < items; i++) {
398	char *opname = SvPV(args[i], len);
399	SV *bitspec = get_op_bitspec(opname, len, 1);
400	if (SvIOK(bitspec)) {
401	myopcode = SvIV(bitspec);
402	if (myopcode < 0 \|\| myopcode >= maxo)
403	croak("panic: opcode %d (%s) out of range",myopcode,opname);
404	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
405	}
406	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
407	int b, j;
408	char *bitmap = SvPV(bitspec,na);
409	myopcode = 0;
410	for (b=0; b < opset_len; b++) {
411	U16 bits = bitmap[b];
412	for (j=0; j < 8 && myopcode < maxo; j++, myopcode++)
413	if (bits & (1 << j))
414	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
415	}
416	}
417	else
ff0cee69	418	croak("panic: invalid bitspec for \"%s\" (type %u)",
ff0cee69	419	opname, (unsigned)SvTYPE(bitspec));
6badd1a5	420	}
	421
	422
	423	void
	424	define_optag(optagsv, mask)
	425	SV *optagsv
	426	SV *mask
	427	CODE:
	428	STRLEN len;
	429	char *optag = SvPV(optagsv, len);
	430	put_op_bitspec(optag, len, mask); /* croaks */
	431	ST(0) = &sv_yes;
	432
	433
	434	void
	435	empty_opset()
	436	CODE:
	437	ST(0) = sv_2mortal(new_opset(Nullsv));
	438
	439	void
	440	full_opset()
	441	CODE:
	442	ST(0) = sv_2mortal(new_opset(opset_all));
	443
	444	void
	445	opmask_add(opset)
	446	SV *opset
	447	PREINIT:
	448	if (!op_mask)
	449	Newz(0, op_mask, maxo, char);
	450
	451	void
	452	opcodes()
	453	PPCODE:
	454	if (GIMME == G_ARRAY) {
	455	croak("opcodes in list context not yet implemented"); /* XXX */
	456	}
	457	else {
	458	XPUSHs(sv_2mortal(newSViv(maxo)));
	459	}
	460
	461	void
	462	opmask()
	463	CODE:
	464	ST(0) = sv_2mortal(new_opset(Nullsv));
	465	if (op_mask) {
	466	char *bitmap = SvPVX(ST(0));
	467	int myopcode;
	468	for(myopcode=0; myopcode < maxo; ++myopcode) {
	469	if (op_mask[myopcode])
	470	bitmap[myopcode >> 3] \|= 1 << (myopcode & 0x07);
	471	}
	472	}
	473