1 #define PERL_NO_GET_CONTEXT
6 /* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
7 #define OP_MASK_BUF_SIZE (MAXO + 100)
9 /* XXX op_named_bits and opset_all are never freed */
10 #define MY_CXT_KEY "Opcode::_guts" XS_VERSION
13 HV * x_op_named_bits; /* cache shared for whole process */
14 SV * x_opset_all; /* mask with all bits set */
15 IV x_opset_len; /* length of opmasks in bytes */
21 #define op_named_bits (MY_CXT.x_op_named_bits)
22 #define opset_all (MY_CXT.x_opset_all)
23 #define opset_len (MY_CXT.x_opset_len)
24 #define opcode_debug (MY_CXT.x_opcode_debug)
26 static SV *new_opset (pTHX_ SV *old_opset);
27 static int verify_opset (pTHX_ SV *opset, int fatal);
28 static void set_opset_bits (pTHX_ char *bitmap, SV *bitspec, int on, char *opname);
29 static void put_op_bitspec (pTHX_ char *optag, STRLEN len, SV *opset);
30 static SV *get_op_bitspec (pTHX_ char *opname, STRLEN len, int fatal);
33 /* Initialise our private op_named_bits HV.
34 * It is first loaded with the name and number of each perl operator.
35 * Then the builtin tags :none and :all are added.
36 * Opcode.pm loads the standard optags from __DATA__
37 * XXX leak-alert: data allocated here is never freed, call this
50 op_named_bits = newHV();
51 op_names = get_op_names();
52 for(i=0; i < PL_maxo; ++i) {
56 hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0);
59 put_op_bitspec(aTHX_ ":none",0, sv_2mortal(new_opset(aTHX_ Nullsv)));
61 opset_all = new_opset(aTHX_ Nullsv);
62 bitmap = SvPV(opset_all, len);
63 i = len-1; /* deal with last byte specially, see below */
65 bitmap[i] = (char)0xFF;
66 /* Take care to set the right number of bits in the last byte */
67 bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
68 put_op_bitspec(aTHX_ ":all",0, opset_all); /* don't mortalise */
72 /* Store a new tag definition. Always a mask.
73 * The tag must not already be defined.
74 * SV *mask is copied not referenced.
78 put_op_bitspec(pTHX_ char *optag, STRLEN len, SV *mask)
83 verify_opset(aTHX_ mask,1);
86 svp = hv_fetch(op_named_bits, optag, len, 1);
88 croak("Opcode tag \"%s\" already defined", optag);
95 /* Fetch a 'bits' entry for an opname or optag (IV/PV).
96 * Note that we return the actual entry for speed.
97 * Always sv_mortalcopy() if returing it to user code.
101 get_op_bitspec(pTHX_ char *opname, STRLEN len, int fatal)
107 len = strlen(opname);
108 svp = hv_fetch(op_named_bits, opname, len, 0);
109 if (!svp || !SvOK(*svp)) {
113 croak("Unknown operator tag \"%s\"", opname);
114 if (*opname == '!') /* XXX here later, or elsewhere? */
115 croak("Can't negate operators here (\"%s\")", opname);
116 if (isALPHA(*opname))
117 croak("Unknown operator name \"%s\"", opname);
118 croak("Unknown operator prefix \"%s\"", opname);
126 new_opset(pTHX_ SV *old_opset)
132 verify_opset(aTHX_ old_opset,1);
133 opset = newSVsv(old_opset);
136 opset = NEWSV(1156, opset_len);
137 Zero(SvPVX(opset), opset_len + 1, char);
138 SvCUR_set(opset, opset_len);
139 (void)SvPOK_only(opset);
141 /* not mortalised here */
147 verify_opset(pTHX_ SV *opset, int fatal)
152 if (!SvOK(opset)) err = "undefined";
153 else if (!SvPOK(opset)) err = "wrong type";
154 else if (SvCUR(opset) != (STRLEN)opset_len) err = "wrong size";
156 croak("Invalid opset: %s", err);
163 set_opset_bits(pTHX_ char *bitmap, SV *bitspec, int on, char *opname)
167 if (SvIOK(bitspec)) {
168 int myopcode = SvIV(bitspec);
169 int offset = myopcode >> 3;
170 int bit = myopcode & 0x07;
171 if (myopcode >= PL_maxo || myopcode < 0)
172 croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
173 if (opcode_debug >= 2)
174 warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
175 myopcode, offset, bit, opname, (on)?"on":"off");
177 bitmap[offset] |= 1 << bit;
179 bitmap[offset] &= ~(1 << bit);
181 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) {
184 char *specbits = SvPV(bitspec, len);
185 if (opcode_debug >= 2)
186 warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
188 while(len-- > 0) bitmap[len] |= specbits[len];
190 while(len-- > 0) bitmap[len] &= ~specbits[len];
193 croak("panic: invalid bitspec for \"%s\" (type %u)",
194 opname, (unsigned)SvTYPE(bitspec));
199 opmask_add(pTHX_ SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */
207 verify_opset(aTHX_ opset,1); /* croaks on bad opset */
209 if (!PL_op_mask) /* caller must ensure PL_op_mask exists */
210 croak("Can't add to uninitialised PL_op_mask");
212 /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
214 bitmask = SvPV(opset, len);
215 for (i=0; i < opset_len; i++) {
216 U16 bits = bitmask[i];
217 if (!bits) { /* optimise for sparse masks */
221 for (j=0; j < 8 && myopcode < PL_maxo; )
222 PL_op_mask[myopcode++] |= bits & (1 << j++);
227 opmask_addlocal(pTHX_ SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */
229 char *orig_op_mask = PL_op_mask;
232 SAVEVPTR(PL_op_mask);
233 /* XXX casting to an ordinary function ptr from a member function ptr
234 * is disallowed by Borland
236 if (opcode_debug >= 2)
237 SAVEDESTRUCTOR((void(*)(void*))Perl_warn,"PL_op_mask restored");
238 PL_op_mask = &op_mask_buf[0];
240 Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
242 Zero(PL_op_mask, PL_maxo, char);
243 opmask_add(aTHX_ opset);
248 MODULE = Opcode PACKAGE = Opcode
255 assert(PL_maxo < OP_MASK_BUF_SIZE);
256 opset_len = (PL_maxo + 7) / 8;
257 if (opcode_debug >= 1)
258 warn("opset_len %ld\n", (long)opset_len);
263 _safe_pkg_prep(Package)
269 hv = gv_stashpv(Package, GV_ADDWARN); /* should exist already */
271 if (strNE(HvNAME(hv),"main")) {
272 Safefree(HvNAME(hv));
273 HvNAME(hv) = savepv("main"); /* make it think it's in main:: */
274 hv_store(hv,"_",1,(SV *)PL_defgv,0); /* connect _ to global */
275 SvREFCNT_inc((SV *)PL_defgv); /* want to keep _ around! */
284 _safe_call_sv(Package, mask, codesv)
289 char op_mask_buf[OP_MASK_BUF_SIZE];
294 opmask_addlocal(aTHX_ mask, op_mask_buf);
296 save_aptr(&PL_endav);
297 PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */
299 save_hptr(&PL_defstash); /* save current default stash */
300 /* the assignment to global defstash changes our sense of 'main' */
301 PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */
303 save_hptr(&PL_curstash);
304 PL_curstash = PL_defstash;
306 /* defstash must itself contain a main:: so we'll add that now */
307 /* take care with the ref counts (was cause of long standing bug) */
308 /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
309 gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
310 sv_free((SV*)GvHV(gv));
311 GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
313 /* %INC must be clean for use/require in compartment */
315 sv_free((SV*)GvHV(PL_incgv)); /* get rid of what save_hash gave us*/
316 GvHV(PL_incgv) = (HV*)SvREFCNT_inc(GvHV(gv_HVadd(gv_fetchpv("INC",TRUE,SVt_PVHV))));
319 perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
320 SPAGAIN; /* for the PUTBACK added by xsubpp */
325 verify_opset(opset, fatal = 0)
329 RETVAL = verify_opset(aTHX_ opset,fatal);
340 STRLEN len = opset_len;
342 opset = sv_2mortal(new_opset(aTHX_ opset)); /* verify and clone opset */
343 bitmap = SvPVX(opset);
345 bitmap[len] = ~bitmap[len];
346 /* take care of extra bits beyond PL_maxo in last byte */
348 bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
354 opset_to_ops(opset, desc = 0)
361 char *bitmap = SvPV(opset, len);
362 char **names = (desc) ? get_op_descs() : get_op_names();
365 verify_opset(aTHX_ opset,1);
366 for (myopcode=0, i=0; i < opset_len; i++) {
367 U16 bits = bitmap[i];
368 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
369 if ( bits & (1 << j) )
370 XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
384 opset = sv_2mortal(new_opset(aTHX_ Nullsv));
385 bitmap = SvPVX(opset);
386 for (i = 0; i < items; i++) {
389 if (verify_opset(aTHX_ ST(i),0)) {
394 opname = SvPV(ST(i), len);
395 if (*opname == '!') { on=0; ++opname;--len; }
396 bitspec = get_op_bitspec(aTHX_ opname, len, 1);
398 set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
403 #define PERMITING (ix == 0 || ix == 1)
404 #define ONLY_THESE (ix == 0 || ix == 2)
407 permit_only(safe, ...)
416 char *bitmap, *opname;
420 if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV)
421 croak("Not a Safe object");
422 mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1);
423 if (ONLY_THESE) /* *_only = new mask, else edit current */
424 sv_setsv(mask, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv)));
426 verify_opset(aTHX_ mask,1); /* croaks */
427 bitmap = SvPVX(mask);
428 for (i = 1; i < items; i++) {
429 on = PERMITING ? 0 : 1; /* deny = mask bit on */
430 if (verify_opset(aTHX_ ST(i),0)) { /* it's a valid mask */
434 else { /* it's an opname/optag */
435 opname = SvPV(ST(i), len);
436 /* invert if op has ! prefix (only one allowed) */
437 if (*opname == '!') { on = !on; ++opname; --len; }
438 bitspec = get_op_bitspec(aTHX_ opname, len, 1); /* croaks */
440 set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
452 char **op_desc = get_op_descs();
455 /* copy args to a scratch area since we may push output values onto */
456 /* the stack faster than we read values off it if masks are used. */
457 args = (SV**)SvPVX(sv_2mortal(newSVpvn((char*)&ST(0), items*sizeof(SV*))));
458 for (i = 0; i < items; i++) {
459 char *opname = SvPV(args[i], len);
460 SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1);
461 if (SvIOK(bitspec)) {
462 myopcode = SvIV(bitspec);
463 if (myopcode < 0 || myopcode >= PL_maxo)
464 croak("panic: opcode %d (%s) out of range",myopcode,opname);
465 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
467 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) {
470 char *bitmap = SvPV(bitspec,n_a);
472 for (b=0; b < opset_len; b++) {
473 U16 bits = bitmap[b];
474 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
476 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
480 croak("panic: invalid bitspec for \"%s\" (type %u)",
481 opname, (unsigned)SvTYPE(bitspec));
486 define_optag(optagsv, mask)
491 char *optag = SvPV(optagsv, len);
493 put_op_bitspec(aTHX_ optag, len, mask); /* croaks */
500 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
506 ST(0) = sv_2mortal(new_opset(aTHX_ opset_all));
513 Newz(0, PL_op_mask, PL_maxo, char);
515 opmask_add(aTHX_ opset);
520 if (GIMME == G_ARRAY) {
521 croak("opcodes in list context not yet implemented"); /* XXX */
524 XPUSHs(sv_2mortal(newSViv(PL_maxo)));
530 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
532 char *bitmap = SvPVX(ST(0));
534 for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
535 if (PL_op_mask[myopcode])
536 bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);