[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 _((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__
 * XXX leak-alert: data allocated here is never freed, call this
 *     at most once
 */

static void
op_names_init(void)
{
    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(":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] = (PL_maxo & 0x07) ? ~(0xFF << (PL_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(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(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(SV *old_opset)
{
    SV *opset;
    if (old_opset) {
	verify_opset(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(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(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(SV *opset)	/* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF	*/
{
    int i,j;
    char *bitmask;
    STRLEN len;
    int myopcode = 0;

    verify_opset(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(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(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();


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(&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


void
invert_opset(opset)
    SV *opset
CODE:
    {
    char *bitmap;
    STRLEN len = opset_len;
    opset = sv_2mortal(new_opset(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(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(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, sv_2mortal(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) = &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(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 >= 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(optag, len, mask); /* croaks */
    ST(0) = &PL_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 (!PL_op_mask)
	Newz(0, PL_op_mask, PL_maxo, char);

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(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
	14	static SV new_opset _((SV old_opset));
	15	static int verify_opset _((SV *opset, int fatal));
	16	static void set_opset_bits _((char bitmap, SV bitspec, int on, char *opname));
	17	static void put_op_bitspec _((char optag, STRLEN len, SV opset));
	18	static SV get_op_bitspec _((char opname, STRLEN len, int fatal));
	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
f0f333f4	30	op_names_init(void)
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	}
	45
	46	put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));
	47
	48	opset_all = new_opset(Nullsv);
	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;
6badd1a5	55	put_op_bitspec(":all",0, opset_all); /* don't mortalise */
	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
f0f333f4	65	put_op_bitspec(char optag, STRLEN len, SV mask)
6badd1a5	66	{
	67	SV **svp;
	68	verify_opset(mask,1);
	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 *
f0f333f4	86	get_op_bitspec(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 *
f0f333f4	109	new_opset(SV *old_opset)
6badd1a5	110	{
	111	SV *opset;
	112	if (old_opset) {
	113	verify_opset(old_opset,1);
	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
f0f333f4	128	verify_opset(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
f0f333f4	142	set_opset_bits(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
3280af22	176	opmask_add(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
	183	verify_opset(opset,1); /* croaks on bad opset */
	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
3280af22	203	opmask_addlocal(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)
3280af22	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);
6badd1a5	219	opmask_add(opset);
	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);
6badd1a5	233	op_names_init();
	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
	247	opmask_addlocal(mask, op_mask_buf);
	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
	273
	274
	275	void
	276	invert_opset(opset)
	277	SV *opset
4d8e9581	278	CODE:
6badd1a5	279	{
	280	char *bitmap;
	281	STRLEN len = opset_len;
4d8e9581	282	opset = sv_2mortal(new_opset(opset)); /* verify and clone opset */
6badd1a5	283	bitmap = SvPVX(opset);
	284	while(len-- > 0)
	285	bitmap[len] = ~bitmap[len];
3280af22	286	/* take care of extra bits beyond PL_maxo in last byte */
	287	if (PL_maxo & 07)
	288	bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
6badd1a5	289	}
	290	ST(0) = opset;
	291
	292
	293	void
	294	opset_to_ops(opset, desc = 0)
	295	SV *opset
	296	int desc
4d8e9581	297	PPCODE:
6badd1a5	298	{
	299	STRLEN len;
	300	int i, j, myopcode;
	301	char *bitmap = SvPV(opset, len);
31fb1209	302	char **names = (desc) ? get_op_descs() : get_op_names();
6badd1a5	303	verify_opset(opset,1);
	304	for (myopcode=0, i=0; i < opset_len; i++) {
	305	U16 bits = bitmap[i];
3280af22	306	for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
6badd1a5	307	if ( bits & (1 << j) )
	308	XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
	309	}
	310	}
	311	}
	312
	313
	314	void
	315	opset(...)
4d8e9581	316	CODE:
6badd1a5	317	int i, j;
	318	SV bitspec, opset;
	319	char *bitmap;
	320	STRLEN len, on;
4d8e9581	321	opset = sv_2mortal(new_opset(Nullsv));
6badd1a5	322	bitmap = SvPVX(opset);
	323	for (i = 0; i < items; i++) {
	324	char *opname;
	325	on = 1;
	326	if (verify_opset(ST(i),0)) {
	327	opname = "(opset)";
	328	bitspec = ST(i);
	329	}
	330	else {
	331	opname = SvPV(ST(i), len);
	332	if (*opname == '!') { on=0; ++opname;--len; }
	333	bitspec = get_op_bitspec(opname, len, 1);
	334	}
	335	set_opset_bits(bitmap, bitspec, on, opname);
	336	}
	337	ST(0) = opset;
	338
	339
	340	#define PERMITING (ix == 0 \|\| ix == 1)
	341	#define ONLY_THESE (ix == 0 \|\| ix == 2)
	342
	343	void
	344	permit_only(safe, ...)
	345	SV *safe
4d8e9581	346	ALIAS:
6badd1a5	347	permit = 1
	348	deny_only = 2
	349	deny = 3
4d8e9581	350	CODE:
6badd1a5	351	int i, on;
	352	SV bitspec, mask;
	353	char bitmap, opname;
	354	STRLEN len;
	355
	356	if (!SvROK(safe) \|\| !SvOBJECT(SvRV(safe)) \|\| SvTYPE(SvRV(safe))!=SVt_PVHV)
	357	croak("Not a Safe object");
	358	mask = hv_fetch((HV)SvRV(safe), "Mask",4, 1);
	359	if (ONLY_THESE) /* _only = new mask, else edit current /
4d8e9581	360	sv_setsv(mask, sv_2mortal(new_opset(PERMITING ? opset_all : Nullsv)));
	361	else
	362	verify_opset(mask,1); /* croaks */
6badd1a5	363	bitmap = SvPVX(mask);
	364	for (i = 1; i < items; i++) {
	365	on = PERMITING ? 0 : 1; /* deny = mask bit on */
	366	if (verify_opset(ST(i),0)) { /* it's a valid mask */
	367	opname = "(opset)";
	368	bitspec = ST(i);
	369	}
	370	else { /* it's an opname/optag */
	371	opname = SvPV(ST(i), len);
	372	/* invert if op has ! prefix (only one allowed) */
	373	if (*opname == '!') { on = !on; ++opname; --len; }
	374	bitspec = get_op_bitspec(opname, len, 1); /* croaks */
	375	}
	376	set_opset_bits(bitmap, bitspec, on, opname);
	377	}
6b88bc9c	378	ST(0) = &PL_sv_yes;
6badd1a5	379
	380
	381
	382	void
	383	opdesc(...)
4d8e9581	384	PPCODE:
6badd1a5	385	int i, myopcode;
	386	STRLEN len;
	387	SV **args;
31fb1209	388	char **op_desc = get_op_descs();
6badd1a5	389	/* copy args to a scratch area since we may push output values onto */
	390	/* the stack faster than we read values off it if masks are used. */
	391	args = (SV*)SvPVX(sv_2mortal(newSVpv((char)&ST(0), itemssizeof(SV))));
	392	for (i = 0; i < items; i++) {
	393	char *opname = SvPV(args[i], len);
	394	SV *bitspec = get_op_bitspec(opname, len, 1);
	395	if (SvIOK(bitspec)) {
	396	myopcode = SvIV(bitspec);
3280af22	397	if (myopcode < 0 \|\| myopcode >= PL_maxo)
6badd1a5	398	croak("panic: opcode %d (%s) out of range",myopcode,opname);
	399	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	400	}
	401	else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
	402	int b, j;
2d8e6c8d	403	STRLEN n_a;
2d8e6c8d	404	char *bitmap = SvPV(bitspec,n_a);
6badd1a5	405	myopcode = 0;
	406	for (b=0; b < opset_len; b++) {
	407	U16 bits = bitmap[b];
3280af22	408	for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
6badd1a5	409	if (bits & (1 << j))
	410	XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
	411	}
	412	}
	413	else
ff0cee69	414	croak("panic: invalid bitspec for \"%s\" (type %u)",
ff0cee69	415	opname, (unsigned)SvTYPE(bitspec));
6badd1a5	416	}
	417
	418
	419	void
	420	define_optag(optagsv, mask)
	421	SV *optagsv
	422	SV *mask
4d8e9581	423	CODE:
6badd1a5	424	STRLEN len;
	425	char *optag = SvPV(optagsv, len);
	426	put_op_bitspec(optag, len, mask); /* croaks */
6b88bc9c	427	ST(0) = &PL_sv_yes;
6badd1a5	428
	429
	430	void
	431	empty_opset()
4d8e9581	432	CODE:
6badd1a5	433	ST(0) = sv_2mortal(new_opset(Nullsv));
	434
	435	void
	436	full_opset()
4d8e9581	437	CODE:
6badd1a5	438	ST(0) = sv_2mortal(new_opset(opset_all));
	439
	440	void
	441	opmask_add(opset)
	442	SV *opset
4d8e9581	443	PREINIT:
3280af22	444	if (!PL_op_mask)
3280af22	445	Newz(0, PL_op_mask, PL_maxo, char);
6badd1a5	446
	447	void
	448	opcodes()
4d8e9581	449	PPCODE:
6badd1a5	450	if (GIMME == G_ARRAY) {
	451	croak("opcodes in list context not yet implemented"); /* XXX */
	452	}
	453	else {
3280af22	454	XPUSHs(sv_2mortal(newSViv(PL_maxo)));
6badd1a5	455	}
	456
	457	void
	458	opmask()
4d8e9581	459	CODE:
6badd1a5	460	ST(0) = sv_2mortal(new_opset(Nullsv));
3280af22	461	if (PL_op_mask) {
6badd1a5	462	char *bitmap = SvPVX(ST(0));
6badd1a5	463	int myopcode;
3280af22	464	for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
3280af22	465	if (PL_op_mask[myopcode])
6badd1a5	466	bitmap[myopcode >> 3] \|= 1 << (myopcode & 0x07);
	467	}
	468	}
	469