5 /* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
6 #define OP_MASK_BUF_SIZE (MAXO + 100)
8 /* XXX op_named_bits and opset_all are never freed */
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;
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));
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__
25 * XXX leak-alert: data allocated here is never freed, call this
37 op_named_bits = newHV();
38 op_names = get_op_names();
39 for(i=0; i < PL_maxo; ++i) {
43 hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0);
46 put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));
48 opset_all = new_opset(Nullsv);
49 bitmap = SvPV(opset_all, len);
50 i = len-1; /* deal with last byte specially, see below */
53 /* Take care to set the right number of bits in the last byte */
54 bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
55 put_op_bitspec(":all",0, opset_all); /* don't mortalise */
59 /* Store a new tag definition. Always a mask.
60 * The tag must not already be defined.
61 * SV *mask is copied not referenced.
65 put_op_bitspec(char *optag, STRLEN len, SV *mask)
71 svp = hv_fetch(op_named_bits, optag, len, 1);
73 croak("Opcode tag \"%s\" already defined", optag);
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.
86 get_op_bitspec(char *opname, STRLEN len, int fatal)
91 svp = hv_fetch(op_named_bits, opname, len, 0);
92 if (!svp || !SvOK(*svp)) {
96 croak("Unknown operator tag \"%s\"", opname);
97 if (*opname == '!') /* XXX here later, or elsewhere? */
98 croak("Can't negate operators here (\"%s\")", opname);
100 croak("Unknown operator name \"%s\"", opname);
101 croak("Unknown operator prefix \"%s\"", opname);
109 new_opset(SV *old_opset)
113 verify_opset(old_opset,1);
114 opset = newSVsv(old_opset);
117 opset = NEWSV(1156, opset_len);
118 Zero(SvPVX(opset), opset_len + 1, char);
119 SvCUR_set(opset, opset_len);
120 (void)SvPOK_only(opset);
122 /* not mortalised here */
128 verify_opset(SV *opset, int fatal)
131 if (!SvOK(opset)) err = "undefined";
132 else if (!SvPOK(opset)) err = "wrong type";
133 else if (SvCUR(opset) != opset_len) err = "wrong size";
135 croak("Invalid opset: %s", err);
142 set_opset_bits(char *bitmap, SV *bitspec, int on, char *opname)
144 if (SvIOK(bitspec)) {
145 int myopcode = SvIV(bitspec);
146 int offset = myopcode >> 3;
147 int bit = myopcode & 0x07;
148 if (myopcode >= PL_maxo || myopcode < 0)
149 croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
150 if (opcode_debug >= 2)
151 warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
152 myopcode, offset, bit, opname, (on)?"on":"off");
154 bitmap[offset] |= 1 << bit;
156 bitmap[offset] &= ~(1 << bit);
158 else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_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");
165 while(len-- > 0) bitmap[len] |= specbits[len];
167 while(len-- > 0) bitmap[len] &= ~specbits[len];
170 croak("panic: invalid bitspec for \"%s\" (type %u)",
171 opname, (unsigned)SvTYPE(bitspec));
176 opmask_add(SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */
183 verify_opset(opset,1); /* croaks on bad opset */
185 if (!PL_op_mask) /* caller must ensure PL_op_mask exists */
186 croak("Can't add to uninitialised PL_op_mask");
188 /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
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 */
197 for (j=0; j < 8 && myopcode < PL_maxo; )
198 PL_op_mask[myopcode++] |= bits & (1 << j++);
203 opmask_addlocal(SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */
205 char *orig_op_mask = PL_op_mask;
206 SAVEPPTR(PL_op_mask);
207 #if !defined(PERL_OBJECT)
208 /* XXX casting to an ordinary function ptr from a member function ptr
209 * is disallowed by Borland
211 if (opcode_debug >= 2)
212 SAVEDESTRUCTOR((void(CPERLscope(*))_((void*)))warn,"PL_op_mask restored");
214 PL_op_mask = &op_mask_buf[0];
216 Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
218 Zero(PL_op_mask, PL_maxo, char);
224 MODULE = Opcode PACKAGE = Opcode
229 assert(PL_maxo < OP_MASK_BUF_SIZE);
230 opset_len = (PL_maxo + 7) / 8;
231 if (opcode_debug >= 1)
232 warn("opset_len %ld\n", (long)opset_len);
237 _safe_call_sv(Package, mask, codesv)
242 char op_mask_buf[OP_MASK_BUF_SIZE];
247 opmask_addlocal(mask, op_mask_buf);
249 save_aptr(&PL_endav);
250 PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */
252 save_hptr(&PL_defstash); /* save current default stack */
253 /* the assignment to global defstash changes our sense of 'main' */
254 PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */
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));
261 GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
264 perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
265 SPAGAIN; /* for the PUTBACK added by xsubpp */
270 verify_opset(opset, fatal = 0)
281 STRLEN len = opset_len;
282 opset = sv_2mortal(new_opset(opset)); /* verify and clone opset */
283 bitmap = SvPVX(opset);
285 bitmap[len] = ~bitmap[len];
286 /* take care of extra bits beyond PL_maxo in last byte */
288 bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
294 opset_to_ops(opset, desc = 0)
301 char *bitmap = SvPV(opset, len);
302 char **names = (desc) ? get_op_descs() : get_op_names();
303 verify_opset(opset,1);
304 for (myopcode=0, i=0; i < opset_len; i++) {
305 U16 bits = bitmap[i];
306 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
307 if ( bits & (1 << j) )
308 XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
321 opset = sv_2mortal(new_opset(Nullsv));
322 bitmap = SvPVX(opset);
323 for (i = 0; i < items; i++) {
326 if (verify_opset(ST(i),0)) {
331 opname = SvPV(ST(i), len);
332 if (*opname == '!') { on=0; ++opname;--len; }
333 bitspec = get_op_bitspec(opname, len, 1);
335 set_opset_bits(bitmap, bitspec, on, opname);
340 #define PERMITING (ix == 0 || ix == 1)
341 #define ONLY_THESE (ix == 0 || ix == 2)
344 permit_only(safe, ...)
353 char *bitmap, *opname;
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 */
360 sv_setsv(mask, sv_2mortal(new_opset(PERMITING ? opset_all : Nullsv)));
362 verify_opset(mask,1); /* croaks */
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 */
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 */
376 set_opset_bits(bitmap, bitspec, on, opname);
388 char **op_desc = get_op_descs();
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), items*sizeof(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);
397 if (myopcode < 0 || myopcode >= PL_maxo)
398 croak("panic: opcode %d (%s) out of range",myopcode,opname);
399 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
401 else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
403 char *bitmap = SvPV(bitspec,PL_na);
405 for (b=0; b < opset_len; b++) {
406 U16 bits = bitmap[b];
407 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
409 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
413 croak("panic: invalid bitspec for \"%s\" (type %u)",
414 opname, (unsigned)SvTYPE(bitspec));
419 define_optag(optagsv, mask)
424 char *optag = SvPV(optagsv, len);
425 put_op_bitspec(optag, len, mask); /* croaks */
432 ST(0) = sv_2mortal(new_opset(Nullsv));
437 ST(0) = sv_2mortal(new_opset(opset_all));
444 Newz(0, PL_op_mask, PL_maxo, char);
449 if (GIMME == G_ARRAY) {
450 croak("opcodes in list context not yet implemented"); /* XXX */
453 XPUSHs(sv_2mortal(newSViv(PL_maxo)));
459 ST(0) = sv_2mortal(new_opset(Nullsv));
461 char *bitmap = SvPVX(ST(0));
463 for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
464 if (PL_op_mask[myopcode])
465 bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);