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, const char *opname);
29 static void put_op_bitspec (pTHX_ const char *optag, STRLEN len, SV *opset);
30 static SV *get_op_bitspec (pTHX_ const 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) {
53 SV * const sv = newSViv(i);
55 (void) hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0);
58 put_op_bitspec(aTHX_ STR_WITH_LEN(":none"), sv_2mortal(new_opset(aTHX_ Nullsv)));
60 opset_all = new_opset(aTHX_ Nullsv);
61 bitmap = SvPV(opset_all, len);
62 memset(bitmap, 0xFF, len-1); /* deal with last byte specially, see below */
63 /* Take care to set the right number of bits in the last byte */
64 bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
65 put_op_bitspec(aTHX_ STR_WITH_LEN(":all"), opset_all); /* don't mortalise */
69 /* Store a new tag definition. Always a mask.
70 * The tag must not already be defined.
71 * SV *mask is copied not referenced.
75 put_op_bitspec(pTHX_ const char *optag, STRLEN len, SV *mask)
80 verify_opset(aTHX_ mask,1);
81 svp = hv_fetch(op_named_bits, optag, len, 1);
83 croak("Opcode tag \"%s\" already defined", optag);
90 /* Fetch a 'bits' entry for an opname or optag (IV/PV).
91 * Note that we return the actual entry for speed.
92 * Always sv_mortalcopy() if returning it to user code.
96 get_op_bitspec(pTHX_ const char *opname, STRLEN len, int fatal)
101 svp = hv_fetch(op_named_bits, opname, len, 0);
102 if (!svp || !SvOK(*svp)) {
106 croak("Unknown operator tag \"%s\"", opname);
107 if (*opname == '!') /* XXX here later, or elsewhere? */
108 croak("Can't negate operators here (\"%s\")", opname);
109 if (isALPHA(*opname))
110 croak("Unknown operator name \"%s\"", opname);
111 croak("Unknown operator prefix \"%s\"", opname);
119 new_opset(pTHX_ SV *old_opset)
125 verify_opset(aTHX_ old_opset,1);
126 opset = newSVsv(old_opset);
129 opset = newSV(opset_len);
130 Zero(SvPVX_const(opset), opset_len + 1, char);
131 SvCUR_set(opset, opset_len);
132 (void)SvPOK_only(opset);
134 /* not mortalised here */
140 verify_opset(pTHX_ SV *opset, int fatal)
142 const char *err = NULL;
145 if (!SvOK(opset)) err = "undefined";
146 else if (!SvPOK(opset)) err = "wrong type";
147 else if (SvCUR(opset) != (STRLEN)opset_len) err = "wrong size";
149 croak("Invalid opset: %s", err);
156 set_opset_bits(pTHX_ char *bitmap, SV *bitspec, int on, const char *opname)
160 if (SvIOK(bitspec)) {
161 const int myopcode = SvIV(bitspec);
162 const int offset = myopcode >> 3;
163 const int bit = myopcode & 0x07;
164 if (myopcode >= PL_maxo || myopcode < 0)
165 croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
166 if (opcode_debug >= 2)
167 warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
168 myopcode, offset, bit, opname, (on)?"on":"off");
170 bitmap[offset] |= 1 << bit;
172 bitmap[offset] &= ~(1 << bit);
174 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) {
177 const char * const specbits = SvPV(bitspec, len);
178 if (opcode_debug >= 2)
179 warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
181 while(len-- > 0) bitmap[len] |= specbits[len];
183 while(len-- > 0) bitmap[len] &= ~specbits[len];
186 croak("panic: invalid bitspec for \"%s\" (type %u)",
187 opname, (unsigned)SvTYPE(bitspec));
192 opmask_add(pTHX_ SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */
200 verify_opset(aTHX_ opset,1); /* croaks on bad opset */
202 if (!PL_op_mask) /* caller must ensure PL_op_mask exists */
203 croak("Can't add to uninitialised PL_op_mask");
205 /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
207 bitmask = SvPV(opset, len);
208 for (i=0; i < opset_len; i++) {
209 const U16 bits = bitmask[i];
210 if (!bits) { /* optimise for sparse masks */
214 for (j=0; j < 8 && myopcode < PL_maxo; )
215 PL_op_mask[myopcode++] |= bits & (1 << j++);
220 opmask_addlocal(pTHX_ SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */
222 char *orig_op_mask = PL_op_mask;
225 SAVEVPTR(PL_op_mask);
226 /* XXX casting to an ordinary function ptr from a member function ptr
227 * is disallowed by Borland
229 if (opcode_debug >= 2)
230 SAVEDESTRUCTOR((void(*)(void*))Perl_warn,"PL_op_mask restored");
231 PL_op_mask = &op_mask_buf[0];
233 Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
235 Zero(PL_op_mask, PL_maxo, char);
236 opmask_add(aTHX_ opset);
241 MODULE = Opcode PACKAGE = Opcode
248 assert(PL_maxo < OP_MASK_BUF_SIZE);
249 opset_len = (PL_maxo + 7) / 8;
250 if (opcode_debug >= 1)
251 warn("opset_len %ld\n", (long)opset_len);
256 _safe_pkg_prep(Package)
262 hv = gv_stashsv(Package, GV_ADDWARN); /* should exist already */
264 if (strNE(HvNAME_get(hv),"main")) {
265 /* make it think it's in main:: */
266 hv_name_set(hv, "main", 4, 0);
267 (void) hv_store(hv,"_",1,(SV *)PL_defgv,0); /* connect _ to global */
268 SvREFCNT_inc((SV *)PL_defgv); /* want to keep _ around! */
277 _safe_call_sv(Package, mask, codesv)
282 char op_mask_buf[OP_MASK_BUF_SIZE];
288 opmask_addlocal(aTHX_ mask, op_mask_buf);
290 save_aptr(&PL_endav);
291 PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */
293 save_hptr(&PL_defstash); /* save current default stash */
294 /* the assignment to global defstash changes our sense of 'main' */
295 PL_defstash = gv_stashsv(Package, GV_ADDWARN); /* should exist already */
297 SAVEGENERICSV(PL_curstash);
298 PL_curstash = (HV *)SvREFCNT_inc_simple(PL_defstash);
300 /* defstash must itself contain a main:: so we'll add that now */
301 /* take care with the ref counts (was cause of long standing bug) */
302 /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
303 gv = gv_fetchpvs("main::", GV_ADDWARN, SVt_PVHV);
304 sv_free((SV*)GvHV(gv));
305 GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
307 /* %INC must be clean for use/require in compartment */
308 dummy_hv = save_hash(PL_incgv);
309 GvHV(PL_incgv) = (HV*)SvREFCNT_inc(GvHV(gv_HVadd(gv_fetchpvs("INC",GV_ADD,SVt_PVHV))));
311 /* Invalidate ISA and method caches */
313 hv_clear(PL_stashcache);
316 perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
317 sv_free( (SV *) dummy_hv); /* get rid of what save_hash gave us*/
318 SPAGAIN; /* for the PUTBACK added by xsubpp */
323 verify_opset(opset, fatal = 0)
327 RETVAL = verify_opset(aTHX_ opset,fatal);
338 STRLEN len = opset_len;
340 opset = sv_2mortal(new_opset(aTHX_ opset)); /* verify and clone opset */
341 bitmap = SvPVX(opset);
343 bitmap[len] = ~bitmap[len];
344 /* take care of extra bits beyond PL_maxo in last byte */
346 bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
352 opset_to_ops(opset, desc = 0)
359 const char * const bitmap = SvPV(opset, len);
360 char **names = (desc) ? get_op_descs() : get_op_names();
363 verify_opset(aTHX_ opset,1);
364 for (myopcode=0, i=0; i < opset_len; i++) {
365 const U16 bits = bitmap[i];
366 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
367 if ( bits & (1 << j) )
368 XPUSHs(newSVpvn_flags(names[myopcode], strlen(names[myopcode]),
382 SV * const opset = sv_2mortal(new_opset(aTHX_ Nullsv));
383 char * const bitmap = SvPVX(opset);
384 for (i = 0; i < items; i++) {
387 if (verify_opset(aTHX_ ST(i),0)) {
392 opname = SvPV(ST(i), len);
393 if (*opname == '!') { on=0; ++opname;--len; }
394 bitspec = get_op_bitspec(aTHX_ opname, len, 1);
396 set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
401 #define PERMITING (ix == 0 || ix == 1)
402 #define ONLY_THESE (ix == 0 || ix == 2)
405 permit_only(safe, ...)
418 if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV)
419 croak("Not a Safe object");
420 mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1);
421 if (ONLY_THESE) /* *_only = new mask, else edit current */
422 sv_setsv(mask, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv)));
424 verify_opset(aTHX_ mask,1); /* croaks */
425 bitmap = SvPVX(mask);
426 for (i = 1; i < items; i++) {
428 int on = PERMITING ? 0 : 1; /* deny = mask bit on */
429 if (verify_opset(aTHX_ ST(i),0)) { /* it's a valid mask */
433 else { /* it's an opname/optag */
434 opname = SvPV(ST(i), len);
435 /* invert if op has ! prefix (only one allowed) */
436 if (*opname == '!') { on = !on; ++opname; --len; }
437 bitspec = get_op_bitspec(aTHX_ opname, len, 1); /* croaks */
439 set_opset_bits(aTHX_ bitmap, bitspec, on, opname);
451 char **op_desc = get_op_descs();
454 /* copy args to a scratch area since we may push output values onto */
455 /* the stack faster than we read values off it if masks are used. */
456 args = (SV**)SvPVX(newSVpvn_flags((char*)&ST(0), items*sizeof(SV*), SVs_TEMP));
457 for (i = 0; i < items; i++) {
458 const char * const opname = SvPV(args[i], len);
459 SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1);
460 if (SvIOK(bitspec)) {
461 const int myopcode = SvIV(bitspec);
462 if (myopcode < 0 || myopcode >= PL_maxo)
463 croak("panic: opcode %d (%s) out of range",myopcode,opname);
464 XPUSHs(newSVpvn_flags(op_desc[myopcode], strlen(op_desc[myopcode]),
467 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) {
469 const char * const bitmap = SvPV_nolen_const(bitspec);
471 for (b=0; b < opset_len; b++) {
472 const U16 bits = bitmap[b];
473 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
475 XPUSHs(newSVpvn_flags(op_desc[myopcode],
476 strlen(op_desc[myopcode]),
481 croak("panic: invalid bitspec for \"%s\" (type %u)",
482 opname, (unsigned)SvTYPE(bitspec));
487 define_optag(optagsv, mask)
492 const char *optag = SvPV(optagsv, len);
494 put_op_bitspec(aTHX_ optag, len, mask); /* croaks */
501 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
507 ST(0) = sv_2mortal(new_opset(aTHX_ opset_all));
514 Newxz(PL_op_mask, PL_maxo, char);
516 opmask_add(aTHX_ opset);
521 if (GIMME == G_ARRAY) {
522 croak("opcodes in list context not yet implemented"); /* XXX */
525 XPUSHs(sv_2mortal(newSViv(PL_maxo)));
531 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv));
533 char * const bitmap = SvPVX(ST(0));
535 for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
536 if (PL_op_mask[myopcode])
537 bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);