5 /* maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
6 #define OP_MASK_BUF_SIZE (MAXO + 100)
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;
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));
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__
34 op_named_bits = newHV();
35 for(i=0; i < maxo; ++i) {
36 hv_store(op_named_bits, op_name[i],strlen(op_name[i]),
41 put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));
43 opset_all = new_opset(Nullsv);
44 bitmap = SvPV(opset_all, len);
45 i = len-1; /* deal with last byte specially, see below */
48 /* Take care to set the right number of bits in the last byte */
49 bitmap[len-1] = ~(~0 << (maxo & 0x07));
50 put_op_bitspec(":all",0, opset_all); /* don't mortalise */
54 /* Store a new tag definition. Always a mask.
55 * The tag must not already be defined.
56 * SV *mask is copied not referenced.
60 put_op_bitspec(optag, len, mask)
69 svp = hv_fetch(op_named_bits, optag, len, 1);
71 croak("Opcode tag \"%s\" already defined", optag);
78 /* Fetch a 'bits' entry for an opname or optag (IV/PV).
79 * Note that we return the actual entry for speed.
80 * Always sv_mortalcopy() if returing it to user code.
84 get_op_bitspec(opname, len, fatal)
92 svp = hv_fetch(op_named_bits, opname, len, 0);
93 if (!svp || !SvOK(*svp)) {
97 croak("Unknown operator tag \"%s\"", opname);
98 if (*opname == '!') /* XXX here later, or elsewhere? */
99 croak("Can't negate operators here (\"%s\")", opname);
100 if (isALPHA(*opname))
101 croak("Unknown operator name \"%s\"", opname);
102 croak("Unknown operator prefix \"%s\"", opname);
115 verify_opset(old_opset,1);
116 opset = newSVsv(old_opset);
119 opset = newSV(opset_len);
120 Zero(SvPVX(opset), opset_len, char);
121 SvCUR_set(opset, opset_len);
122 (void)SvPOK_only(opset);
124 /* not mortalised here */
130 verify_opset(opset, fatal)
135 if (!SvOK(opset)) err = "undefined";
136 else if (!SvPOK(opset)) err = "wrong type";
137 else if (SvCUR(opset) != opset_len) err = "wrong size";
139 croak("Invalid opset: %s", err);
146 set_opset_bits(bitmap, bitspec, on, opname)
152 if (SvIOK(bitspec)) {
153 int myopcode = SvIV(bitspec);
154 int offset = myopcode >> 3;
155 int bit = myopcode & 0x07;
156 if (myopcode >= maxo || myopcode < 0)
157 croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
158 if (opcode_debug >= 2)
159 warn("set_opset_bits bit %2d (off=%d, bit=%d) %s on\n",
160 myopcode, offset, bit, opname, (on)?"on":"off");
162 bitmap[offset] |= 1 << bit;
164 bitmap[offset] &= ~(1 << bit);
166 else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
169 char *specbits = SvPV(bitspec, len);
170 if (opcode_debug >= 2)
171 warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
173 while(len-- > 0) bitmap[len] |= specbits[len];
175 while(len-- > 0) bitmap[len] &= ~specbits[len];
178 croak("panic: invalid bitspec for \"%s\" (type %d)",
179 opname, SvTYPE(bitspec));
184 opmask_add(opset) /* THE ONLY FUNCTION TO EDIT op_mask ITSELF */
192 verify_opset(opset,1); /* croaks on bad opset */
194 if (!op_mask) /* caller must ensure op_mask exists */
195 croak("Can't add to uninitialised op_mask");
197 /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
199 bitmask = SvPV(opset, len);
200 for (i=0; i < opset_len; i++) {
201 U16 bits = bitmask[i];
202 if (!bits) { /* optimise for sparse masks */
206 for (j=0; j < 8 && myopcode < maxo; )
207 op_mask[myopcode++] |= bits & (1 << j++);
212 opmask_addlocal(opset, op_mask_buf) /* Localise op_mask then opmask_add() */
216 char *orig_op_mask = op_mask;
218 if (opcode_debug >= 2)
219 SAVEDESTRUCTOR((void(*)_((void*)))warn,"op_mask restored");
220 op_mask = &op_mask_buf[0];
222 Copy(orig_op_mask, op_mask, maxo, char);
224 Zero(op_mask, maxo, char);
230 MODULE = Opcode PACKAGE = Opcode
235 assert(maxo < OP_MASK_BUF_SIZE);
236 opset_len = (maxo / 8) + 1;
237 if (opcode_debug >= 1)
238 warn("opset_len %d\n", opset_len);
243 _safe_call_sv(package, mask, codesv)
248 char op_mask_buf[OP_MASK_BUF_SIZE];
253 opmask_addlocal(mask, op_mask_buf);
256 endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */
258 save_hptr(&defstash); /* save current default stack */
259 /* the assignment to global defstash changes our sense of 'main' */
260 defstash = gv_stashpv(package, GV_ADDWARN); /* should exist already */
262 /* defstash must itself contain a main:: so we'll add that now */
263 /* take care with the ref counts (was cause of long standing bug) */
264 /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
265 gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
266 sv_free((SV*)GvHV(gv));
267 GvHV(gv) = (HV*)SvREFCNT_inc(defstash);
270 perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
271 SPAGAIN; /* for the PUTBACK added by xsubpp */
276 verify_opset(opset, fatal = 0)
287 STRLEN len = opset_len;
288 opset = new_opset(opset); /* verify and clone opset */
289 bitmap = SvPVX(opset);
291 bitmap[len] = ~bitmap[len];
292 /* take care of extra bits beyond maxo in last byte */
293 bitmap[opset_len-1] &= ~(0xFF << (maxo & 0x0F));
299 opset_to_ops(opset, desc = 0)
306 char *bitmap = SvPV(opset, len);
307 char **names = (desc) ? op_desc : op_name;
308 verify_opset(opset,1);
309 for (myopcode=0, i=0; i < opset_len; i++) {
310 U16 bits = bitmap[i];
311 for (j=0; j < 8 && myopcode < maxo; j++, myopcode++) {
312 if ( bits & (1 << j) )
313 XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
326 opset = new_opset(Nullsv);
327 bitmap = SvPVX(opset);
328 for (i = 0; i < items; i++) {
331 if (verify_opset(ST(i),0)) {
336 opname = SvPV(ST(i), len);
337 if (*opname == '!') { on=0; ++opname;--len; }
338 bitspec = get_op_bitspec(opname, len, 1);
340 set_opset_bits(bitmap, bitspec, on, opname);
345 #define PERMITING (ix == 0 || ix == 1)
346 #define ONLY_THESE (ix == 0 || ix == 2)
349 permit_only(safe, ...)
358 char *bitmap, *opname;
361 if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV)
362 croak("Not a Safe object");
363 mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1);
364 if (ONLY_THESE) /* *_only = new mask, else edit current */
365 sv_setsv(mask, new_opset(PERMITING ? opset_all : Nullsv));
366 else verify_opset(mask,1); /* croaks */
367 bitmap = SvPVX(mask);
368 for (i = 1; i < items; i++) {
369 on = PERMITING ? 0 : 1; /* deny = mask bit on */
370 if (verify_opset(ST(i),0)) { /* it's a valid mask */
374 else { /* it's an opname/optag */
375 opname = SvPV(ST(i), len);
376 /* invert if op has ! prefix (only one allowed) */
377 if (*opname == '!') { on = !on; ++opname; --len; }
378 bitspec = get_op_bitspec(opname, len, 1); /* croaks */
380 set_opset_bits(bitmap, bitspec, on, opname);
392 /* copy args to a scratch area since we may push output values onto */
393 /* the stack faster than we read values off it if masks are used. */
394 args = (SV**)SvPVX(sv_2mortal(newSVpv((char*)&ST(0), items*sizeof(SV*))));
395 for (i = 0; i < items; i++) {
396 char *opname = SvPV(args[i], len);
397 SV *bitspec = get_op_bitspec(opname, len, 1);
398 if (SvIOK(bitspec)) {
399 myopcode = SvIV(bitspec);
400 if (myopcode < 0 || myopcode >= maxo)
401 croak("panic: opcode %d (%s) out of range",myopcode,opname);
402 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
404 else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
406 char *bitmap = SvPV(bitspec,na);
408 for (b=0; b < opset_len; b++) {
409 U16 bits = bitmap[b];
410 for (j=0; j < 8 && myopcode < maxo; j++, myopcode++)
412 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
416 croak("panic: invalid bitspec for \"%s\" (type %d)",
417 opname, SvTYPE(bitspec));
422 define_optag(optagsv, mask)
427 char *optag = SvPV(optagsv, len);
428 put_op_bitspec(optag, len, mask); /* croaks */
435 ST(0) = sv_2mortal(new_opset(Nullsv));
440 ST(0) = sv_2mortal(new_opset(opset_all));
447 Newz(0, op_mask, maxo, char);
452 if (GIMME == G_ARRAY) {
453 croak("opcodes in list context not yet implemented"); /* XXX */
456 XPUSHs(sv_2mortal(newSViv(maxo)));
462 ST(0) = sv_2mortal(new_opset(Nullsv));
464 char *bitmap = SvPVX(ST(0));
466 for(myopcode=0; myopcode < maxo; ++myopcode) {
467 if (op_mask[myopcode])
468 bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);