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

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

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

/* XXX op_named_bits and opset_all are never freed */
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 (pTHX_ SV *old_opset);
static int  verify_opset (pTHX_ SV *opset, int fatal);
static void set_opset_bits (pTHX_ char *bitmap, SV *bitspec, int on, char *opname);
static void put_op_bitspec (pTHX_ char *optag,  STRLEN len, SV *opset);
static SV  *get_op_bitspec (pTHX_ 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__
 * XXX leak-alert: data allocated here is never freed, call this
 *     at most once
 */

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

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

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

    opset_all = new_opset(aTHX_ 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] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
    put_op_bitspec(aTHX_ ":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(pTHX_ char *optag, STRLEN len, SV *mask)
{
    SV **svp;
    verify_opset(aTHX_ 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(pTHX_ 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(pTHX_ SV *old_opset)
{
    SV *opset;
    if (old_opset) {
	verify_opset(aTHX_ old_opset,1);
	opset = newSVsv(old_opset);
    }
    else {
	opset = NEWSV(1156, 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(pTHX_ 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(pTHX_ 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 >= PL_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(pTHX_ SV *opset)	/* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF	*/
{
    int i,j;
    char *bitmask;
    STRLEN len;
    int myopcode = 0;

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

    if (!PL_op_mask)		/* caller must ensure PL_op_mask exists	*/
	croak("Can't add to uninitialised PL_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 < PL_maxo; )
	    PL_op_mask[myopcode++] |= bits & (1 << j++);
    }
}

static void
opmask_addlocal(pTHX_ SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */
{
    char *orig_op_mask = PL_op_mask;
    SAVEPPTR(PL_op_mask);
#if !defined(PERL_OBJECT)
    /* XXX casting to an ordinary function ptr from a member function ptr
     * is disallowed by Borland
     */
    if (opcode_debug >= 2)
	SAVEDESTRUCTOR((void(CPERLscope(*))(void*))warn,"PL_op_mask restored");
#endif
    PL_op_mask = &op_mask_buf[0];
    if (orig_op_mask)
	Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
    else
	Zero(PL_op_mask, PL_maxo, char);
    opmask_add(aTHX_ opset);
}


MODULE = Opcode	PACKAGE = Opcode

PROTOTYPES: ENABLE

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


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(aTHX_ mask, op_mask_buf);

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

    save_hptr(&PL_defstash);		/* save current default stack	*/
    /* the assignment to global defstash changes our sense of 'main'	*/
    PL_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(PL_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
CODE:
    RETVAL = verify_opset(aTHX_ opset,fatal);
OUTPUT:
    RETVAL

void
invert_opset(opset)
    SV *opset
CODE:
    {
    char *bitmap;
    STRLEN len = opset_len;
    opset = sv_2mortal(new_opset(aTHX_ opset));	/* verify and clone opset */
    bitmap = SvPVX(opset);
    while(len-- > 0)
	bitmap[len] = ~bitmap[len];
    /* take care of extra bits beyond PL_maxo in last byte	*/
    if (PL_maxo & 07)
	bitmap[opset_len-1] &= ~(0xFF << (PL_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) ? get_op_descs() : get_op_names();
    verify_opset(aTHX_ opset,1);
    for (myopcode=0, i=0; i < opset_len; i++) {
	U16 bits = bitmap[i];
	for (j=0; j < 8 && myopcode < PL_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 = sv_2mortal(new_opset(aTHX_ Nullsv));
    bitmap = SvPVX(opset);
    for (i = 0; i < items; i++) {
	char *opname;
	on = 1;
	if (verify_opset(aTHX_ ST(i),0)) {
	    opname = "(opset)";
	    bitspec = ST(i);
	}
	else {
	    opname = SvPV(ST(i), len);
	    if (*opname == '!') { on=0; ++opname;--len; }
	    bitspec = get_op_bitspec(aTHX_ opname, len, 1);
	}
	set_opset_bits(aTHX_ 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, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv)));
    else
	verify_opset(aTHX_ mask,1); /* croaks */
    bitmap = SvPVX(mask);
    for (i = 1; i < items; i++) {
	on = PERMITING ? 0 : 1;		/* deny = mask bit on	*/
	if (verify_opset(aTHX_ 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(aTHX_ opname, len, 1); /* croaks */
	}
	set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
    }
    ST(0) = &PL_sv_yes;


void
opdesc(...)
PPCODE:
    int i, myopcode;
    STRLEN len;
    SV **args;
    char **op_desc = get_op_descs(); 
    /* 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(newSVpvn((char*)&ST(0), items*sizeof(SV*))));
    for (i = 0; i < items; i++) {
	char *opname = SvPV(args[i], len);
	SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1);
	if (SvIOK(bitspec)) {
	    myopcode = SvIV(bitspec);
	    if (myopcode < 0 || myopcode >= PL_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;
	    STRLEN n_a;
	    char *bitmap = SvPV(bitspec,n_a);
	    myopcode = 0;
	    for (b=0; b < opset_len; b++) {
		U16 bits = bitmap[b];
		for (j=0; j < 8 && myopcode < PL_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(aTHX_ optag, len, mask); /* croaks */
    ST(0) = &PL_sv_yes;


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

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

void
opmask_add(opset)
    SV *opset
PREINIT:
    if (!PL_op_mask)
	Newz(0, PL_op_mask, PL_maxo, char);
CODE:
    opmask_add(aTHX_ opset);

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

void
opmask()
CODE:
    ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
    if (PL_op_mask) {
	char *bitmap = SvPVX(ST(0));
	int myopcode;
	for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
	    if (PL_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
3280af22	5	/* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
6badd1a5	6	#define OP_MASK_BUF_SIZE (MAXO + 100)
6badd1a5	7
4d8e9581	8	/* XXX op_named_bits and opset_all are never freed */
6badd1a5	9	static HV op_named_bits; / cache shared for whole process */
	10	static SV opset_all; / mask with all bits set */
	11	static IV opset_len; /* length of opmasks in bytes */
	12	static int opcode_debug = 0;
	13
cea2e8a9	14	static SV new_opset (pTHX_ SV old_opset);
	15	static int verify_opset (pTHX_ SV *opset, int fatal);
	16	static void set_opset_bits (pTHX_ char bitmap, SV bitspec, int on, char *opname);
	17	static void put_op_bitspec (pTHX_ char optag, STRLEN len, SV opset);
	18	static SV get_op_bitspec (pTHX_ char opname, STRLEN len, int fatal);
6badd1a5	19
	20
	21	/* Initialise our private op_named_bits HV.
	22	* It is first loaded with the name and number of each perl operator.
	23	* Then the builtin tags :none and :all are added.
	24	* Opcode.pm loads the standard optags from __DATA__
4d8e9581	25	* XXX leak-alert: data allocated here is never freed, call this
4d8e9581	26	* at most once
6badd1a5	27	*/
	28
	29	static void
cea2e8a9	30	op_names_init(pTHX)
6badd1a5	31	{
	32	int i;
	33	STRLEN len;
31fb1209	34	char **op_names;
6badd1a5	35	char *bitmap;
	36
	37	op_named_bits = newHV();
31fb1209	38	op_names = get_op_names();
3280af22	39	for(i=0; i < PL_maxo; ++i) {
e858de61	40	SV *sv;
	41	sv = newSViv(i);
	42	SvREADONLY_on(sv);
31fb1209	43	hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0);
6badd1a5	44	}
6badd1a5	45
cea2e8a9	46	put_op_bitspec(aTHX_ ":none",0, sv_2mortal(new_opset(aTHX_ Nullsv)));
6badd1a5	47
cea2e8a9	48	opset_all = new_opset(aTHX_ Nullsv);
6badd1a5	49	bitmap = SvPV(opset_all, len);
	50	i = len-1; /* deal with last byte specially, see below */
	51	while(i-- > 0)
	52	bitmap[i] = 0xFF;
	53	/* Take care to set the right number of bits in the last byte */
3280af22	54	bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
cea2e8a9	55	put_op_bitspec(aTHX_ ":all",0, opset_all); /* don't mortalise */
6badd1a5	56	}
	57
	58
	59	/* Store a new tag definition. Always a mask.
	60	* The tag must not already be defined.
	61	* SV *mask is copied not referenced.
	62	*/
	63
	64	static void
cea2e8a9	65	put_op_bitspec(pTHX_ char optag, STRLEN len, SV mask)
6badd1a5	66	{
6badd1a5	67	SV **svp;
cea2e8a9	68	verify_opset(aTHX_ mask,1);
6badd1a5	69	if (!len)
	70	len = strlen(optag);
	71	svp = hv_fetch(op_named_bits, optag, len, 1);
	72	if (SvOK(*svp))
	73	croak("Opcode tag \"%s\" already defined", optag);
	74	sv_setsv(*svp, mask);
	75	SvREADONLY_on(*svp);
	76	}
	77
	78
	79
	80	/* Fetch a 'bits' entry for an opname or optag (IV/PV).
	81	* Note that we return the actual entry for speed.
	82	* Always sv_mortalcopy() if returing it to user code.
	83	*/
	84
	85	static SV *
cea2e8a9	86	get_op_bitspec(pTHX_ char *opname, STRLEN len, int fatal)
6badd1a5	87	{
	88	SV **svp;
	89	if (!len)
	90	len = strlen(opname);
	91	svp = hv_fetch(op_named_bits, opname, len, 0);
	92	if (!svp \|\| !SvOK(*svp)) {
	93	if (!fatal)
	94	return Nullsv;
	95	if (*opname == ':')
	96	croak("Unknown operator tag \"%s\"", opname);
	97	if (opname == '!') / XXX here later, or elsewhere? */
	98	croak("Can't negate operators here (\"%s\")", opname);
	99	if (isALPHA(*opname))
	100	croak("Unknown operator name \"%s\"", opname);
	101	croak("Unknown operator prefix \"%s\"", opname);
	102	}
	103	return *svp;
	104	}
	105
	106
	107
	108	static SV *
cea2e8a9	109	new_opset(pTHX_ SV *old_opset)
6badd1a5	110	{
	111	SV *opset;
	112	if (old_opset) {
cea2e8a9	113	verify_opset(aTHX_ old_opset,1);
6badd1a5	114	opset = newSVsv(old_opset);
	115	}
	116	else {
8c52afec	117	opset = NEWSV(1156, opset_len);
67a5ea69	118	Zero(SvPVX(opset), opset_len + 1, char);
6badd1a5	119	SvCUR_set(opset, opset_len);
	120	(void)SvPOK_only(opset);
	121	}
	122	/* not mortalised here */
	123	return opset;
	124	}
	125
	126
	127	static int
cea2e8a9	128	verify_opset(pTHX_ SV *opset, int fatal)
6badd1a5	129	{
	130	char *err = Nullch;
	131	if (!SvOK(opset)) err = "undefined";
	132	else if (!SvPOK(opset)) err = "wrong type";
	133	else if (SvCUR(opset) != opset_len) err = "wrong size";
	134	if (err && fatal) {
	135	croak("Invalid opset: %s", err);
	136	}
	137	return !err;
	138	}
	139
	140
	141	static void
cea2e8a9	142	set_opset_bits(pTHX_ char bitmap, SV bitspec, int on, char *opname)
6badd1a5	143	{
	144	if (SvIOK(bitspec)) {
	145	int myopcode = SvIV(bitspec);
	146	int offset = myopcode >> 3;
	147	int bit = myopcode & 0x07;
3280af22	148	if (myopcode >= PL_maxo \|\| myopcode < 0)
6badd1a5	149	croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
6badd1a5	150	if (opcode_debug >= 2)
ff0cee69	151	warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
6badd1a5	152	myopcode, offset, bit, opname, (on)?"on":"off");
	153	if (on)
	154	bitmap[offset] \|= 1 << bit;
	155	else
	156	bitmap[offset] &= ~(1 << bit);
	157	}
	158	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
	159
	160	STRLEN len;
	161	char *specbits = SvPV(bitspec, len);
	162	if (opcode_debug >= 2)
	163	warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
	164	if (on)
	165	while(len-- > 0) bitmap[len] \|= specbits[len];
	166	else
	167	while(len-- > 0) bitmap[len] &= ~specbits[len];
	168	}
	169	else
ff0cee69	170	croak("panic: invalid bitspec for \"%s\" (type %u)",
ff0cee69	171	opname, (unsigned)SvTYPE(bitspec));
6badd1a5	172	}
	173
	174
	175	static void
cea2e8a9	176	opmask_add(pTHX_ SV opset) / THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */
6badd1a5	177	{
	178	int i,j;
	179	char *bitmask;
	180	STRLEN len;
	181	int myopcode = 0;
	182
cea2e8a9	183	verify_opset(aTHX_ opset,1); /* croaks on bad opset */
6badd1a5	184
3280af22	185	if (!PL_op_mask) /* caller must ensure PL_op_mask exists */
3280af22	186	croak("Can't add to uninitialised PL_op_mask");
6badd1a5	187
	188	/* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
	189
	190	bitmask = SvPV(opset, len);
	191	for (i=0; i < opset_len; i++) {
	192	U16 bits = bitmask[i];
	193	if (!bits) { /* optimise for sparse masks */
	194	myopcode += 8;
	195	continue;
	196	}
3280af22	197	for (j=0; j < 8 && myopcode < PL_maxo; )
3280af22	198	PL_op_mask[myopcode++] \|= bits & (1 << j++);
6badd1a5	199	}
	200	}
	201
	202	static void
cea2e8a9	203	opmask_addlocal(pTHX_ SV opset, char op_mask_buf) /* Localise PL_op_mask then opmask_add() */
6badd1a5	204	{
3280af22	205	char *orig_op_mask = PL_op_mask;
3280af22	206	SAVEPPTR(PL_op_mask);
db15561c	207	#if !defined(PERL_OBJECT)
ac4c12e7	208	/* XXX casting to an ordinary function ptr from a member function ptr
	209	* is disallowed by Borland
	210	*/
6badd1a5	211	if (opcode_debug >= 2)
20ce7b12	212	SAVEDESTRUCTOR((void(CPERLscope())(void))warn,"PL_op_mask restored");
ac4c12e7	213	#endif
3280af22	214	PL_op_mask = &op_mask_buf[0];
6badd1a5	215	if (orig_op_mask)
3280af22	216	Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
6badd1a5	217	else
3280af22	218	Zero(PL_op_mask, PL_maxo, char);
cea2e8a9	219	opmask_add(aTHX_ opset);
6badd1a5	220	}
	221
	222
	223
	224	MODULE = Opcode PACKAGE = Opcode
	225
	226	PROTOTYPES: ENABLE
	227
	228	BOOT:
3280af22	229	assert(PL_maxo < OP_MASK_BUF_SIZE);
3280af22	230	opset_len = (PL_maxo + 7) / 8;
6badd1a5	231	if (opcode_debug >= 1)
ff0cee69	232	warn("opset_len %ld\n", (long)opset_len);
cea2e8a9	233	op_names_init(aTHX);
6badd1a5	234
	235
	236	void
9d8a25dc	237	_safe_call_sv(Package, mask, codesv)
9d8a25dc	238	char * Package
6badd1a5	239	SV * mask
6badd1a5	240	SV * codesv
4d8e9581	241	PPCODE:
6badd1a5	242	char op_mask_buf[OP_MASK_BUF_SIZE];
	243	GV *gv;
	244
	245	ENTER;
	246
cea2e8a9	247	opmask_addlocal(aTHX_ mask, op_mask_buf);
6badd1a5	248
3280af22	249	save_aptr(&PL_endav);
3280af22	250	PL_endav = (AV)sv_2mortal((SV)newAV()); /* ignore END blocks for now */
6badd1a5	251
3280af22	252	save_hptr(&PL_defstash); /* save current default stack */
6badd1a5	253	/* the assignment to global defstash changes our sense of 'main' */
3280af22	254	PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */
6badd1a5	255
	256	/* defstash must itself contain a main:: so we'll add that now */
	257	/* take care with the ref counts (was cause of long standing bug) */
	258	/* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
	259	gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
	260	sv_free((SV*)GvHV(gv));
3280af22	261	GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
6badd1a5	262
924508f0	263	PUSHMARK(SP);
6badd1a5	264	perl_call_sv(codesv, GIMME\|G_EVAL\|G_KEEPERR); /* use callers context */
	265	SPAGAIN; /* for the PUTBACK added by xsubpp */
	266	LEAVE;
	267
	268
	269	int
	270	verify_opset(opset, fatal = 0)
	271	SV *opset
	272	int fatal
cea2e8a9	273	CODE:
	274	RETVAL = verify_opset(aTHX_ opset,fatal);
	275	OUTPUT:
	276	RETVAL
6badd1a5	277
	278	void
	279	invert_opset(opset)
	280	SV *opset
4d8e9581	281	CODE:
6badd1a5	282	{
	283	char *bitmap;
	284	STRLEN len = opset_len;
cea2e8a9	285	opset = sv_2mortal(new_opset(aTHX_ opset)); /* verify and clone opset */
6badd1a5	286	bitmap = SvPVX(opset);
	287	while(len-- > 0)
	288	bitmap[len] = ~bitmap[len];
3280af22	289	/* take care of extra bits beyond PL_maxo in last byte */
	290	if (PL_maxo & 07)
	291	bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
6badd1a5	292	}
	293	ST(0) = opset;
	294
	295
	296	void
	297	opset_to_ops(opset, desc = 0)
	298	SV *opset
	299	int desc
4d8e9581	300	PPCODE:
6badd1a5	301	{
	302	STRLEN len;
	303	int i, j, myopcode;
	304	char *bitmap = SvPV(opset, len);
31fb1209	305	char **names = (desc) ? get_op_descs() : get_op_names();
cea2e8a9	306	verify_opset(aTHX_ opset,1);
6badd1a5	307	for (myopcode=0, i=0; i < opset_len; i++) {
6badd1a5	308	U16 bits = bitmap[i];
3280af22	309	for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
6badd1a5	310	if ( bits & (1 << j) )
	311	XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
	312	}
	313	}
	314	}
	315
	316
	317	void
	318	opset(...)
4d8e9581	319	CODE:
6badd1a5	320	int i, j;
	321	SV bitspec, opset;
	322	char *bitmap;
	323	STRLEN len, on;
cea2e8a9	324	opset = sv_2mortal(new_opset(aTHX_ Nullsv));
6badd1a5	325	bitmap = SvPVX(opset);
	326	for (i = 0; i < items; i++) {
	327	char *opname;
	328	on = 1;
cea2e8a9	329	if (verify_opset(aTHX_ ST(i),0)) {
6badd1a5	330	opname = "(opset)";
	331	bitspec = ST(i);
	332	}
	333	else {
	334	opname = SvPV(ST(i), len);
	335	if (*opname == '!') { on=0; ++opname;--len; }
cea2e8a9	336	bitspec = get_op_bitspec(aTHX_ opname, len, 1);
6badd1a5	337	}
cea2e8a9	338	set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
6badd1a5	339	}
	340	ST(0) = opset;
	341
	342
	343	#define PERMITING (ix == 0 \|\| ix == 1)
	344	#define ONLY_THESE (ix == 0 \|\| ix == 2)
	345
	346	void
	347	permit_only(safe, ...)
	348	SV *safe
4d8e9581	349	ALIAS:
6badd1a5	350	permit = 1
	351	deny_only = 2
	352	deny = 3
4d8e9581	353	CODE:
6badd1a5	354	int i, on;
	355	SV bitspec, mask;
	356	char bitmap, opname;
	357	STRLEN len;
	358
	359	if (!SvROK(safe) \|\| !SvOBJECT(SvRV(safe)) \|\| SvTYPE(SvRV(safe))!=SVt_PVHV)
	360	croak("Not a Safe object");
	361	mask = hv_fetch((HV)SvRV(safe), "Mask",4, 1);
	362	if (ONLY_THESE) /* _only = new mask, else edit current /
cea2e8a9	363	sv_setsv(mask, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv)));
4d8e9581	364	else
cea2e8a9	365	verify_opset(aTHX_ mask,1); /* croaks */
6badd1a5	366	bitmap = SvPVX(mask);
	367	for (i = 1; i < items; i++) {
	368	on = PERMITING ? 0 : 1; /* deny = mask bit on */
cea2e8a9	369	if (verify_opset(aTHX_ ST(i),0)) { /* it's a valid mask */
6badd1a5	370	opname = "(opset)";
	371	bitspec = ST(i);
	372	}
	373	else { /* it's an opname/optag */
	374	opname = SvPV(ST(i), len);
	375	/* invert if op has ! prefix (only one allowed) */
	376	if (*opname == '!') { on = !on; ++opname; --len; }
cea2e8a9	377	bitspec = get_op_bitspec(aTHX_ opname, len, 1); /* croaks */
6badd1a5	378	}
cea2e8a9	379	set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
6badd1a5	380	}
6b88bc9c	381	ST(0) = &PL_sv_yes;
6badd1a5	382
	383
	384
	385	void
	386	opdesc(...)
4d8e9581	387	PPCODE:
6badd1a5	388	int i, myopcode;
	389	STRLEN len;
	390	SV **args;
31fb1209	391	char **op_desc = get_op_descs();
6badd1a5	392	/* copy args to a scratch area since we may push output values onto */
6badd1a5	393	/* the stack faster than we read values off it if masks are used. */
79cb57f6	394	args = (SV*)SvPVX(sv_2mortal(newSVpvn((char)&ST(0), itemssizeof(SV))));
6badd1a5	395	for (i = 0; i < items; i++) {
6badd1a5	396	char *opname = SvPV(args[i], len);
cea2e8a9	397	SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1);
6badd1a5	398	if (SvIOK(bitspec)) {
6badd1a5	399	myopcode = SvIV(bitspec);
3280af22	400	if (myopcode < 0 \|\| myopcode >= PL_maxo)
6badd1a5	401	croak("panic: opcode %d (%s) out of range",myopcode,opname);
	402	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	403	}
	404	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
	405	int b, j;
2d8e6c8d	406	STRLEN n_a;
2d8e6c8d	407	char *bitmap = SvPV(bitspec,n_a);
6badd1a5	408	myopcode = 0;
	409	for (b=0; b < opset_len; b++) {
	410	U16 bits = bitmap[b];
3280af22	411	for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
6badd1a5	412	if (bits & (1 << j))
	413	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	414	}
	415	}
	416	else
ff0cee69	417	croak("panic: invalid bitspec for \"%s\" (type %u)",
ff0cee69	418	opname, (unsigned)SvTYPE(bitspec));
6badd1a5	419	}
	420
	421
	422	void
	423	define_optag(optagsv, mask)
	424	SV *optagsv
	425	SV *mask
4d8e9581	426	CODE:
6badd1a5	427	STRLEN len;
6badd1a5	428	char *optag = SvPV(optagsv, len);
cea2e8a9	429	put_op_bitspec(aTHX_ optag, len, mask); /* croaks */
6b88bc9c	430	ST(0) = &PL_sv_yes;
6badd1a5	431
	432
	433	void
	434	empty_opset()
4d8e9581	435	CODE:
cea2e8a9	436	ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
6badd1a5	437
	438	void
	439	full_opset()
4d8e9581	440	CODE:
cea2e8a9	441	ST(0) = sv_2mortal(new_opset(aTHX_ opset_all));
6badd1a5	442
	443	void
	444	opmask_add(opset)
	445	SV *opset
4d8e9581	446	PREINIT:
3280af22	447	if (!PL_op_mask)
3280af22	448	Newz(0, PL_op_mask, PL_maxo, char);
cea2e8a9	449	CODE:
cea2e8a9	450	opmask_add(aTHX_ opset);
6badd1a5	451
	452	void
	453	opcodes()
4d8e9581	454	PPCODE:
6badd1a5	455	if (GIMME == G_ARRAY) {
	456	croak("opcodes in list context not yet implemented"); /* XXX */
	457	}
	458	else {
3280af22	459	XPUSHs(sv_2mortal(newSViv(PL_maxo)));
6badd1a5	460	}
	461
	462	void
	463	opmask()
4d8e9581	464	CODE:
cea2e8a9	465	ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
3280af22	466	if (PL_op_mask) {
6badd1a5	467	char *bitmap = SvPVX(ST(0));
6badd1a5	468	int myopcode;
3280af22	469	for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
3280af22	470	if (PL_op_mask[myopcode])
6badd1a5	471	bitmap[myopcode >> 3] \|= 1 << (myopcode & 0x07);
	472	}
	473	}
	474