Commit | Line | Data |
c5be433b |
1 | #define PERL_NO_GET_CONTEXT |
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2 | #include "EXTERN.h" |
3 | #include "perl.h" |
4 | #include "XSUB.h" |
5 | |
3280af22 |
6 | /* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */ |
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7 | #define OP_MASK_BUF_SIZE (MAXO + 100) |
8 | |
4d8e9581 |
9 | /* XXX op_named_bits and opset_all are never freed */ |
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10 | static HV *op_named_bits; /* cache shared for whole process */ |
11 | static SV *opset_all; /* mask with all bits set */ |
12 | static IV opset_len; /* length of opmasks in bytes */ |
13 | static int opcode_debug = 0; |
14 | |
cea2e8a9 |
15 | static SV *new_opset (pTHX_ SV *old_opset); |
16 | static int verify_opset (pTHX_ SV *opset, int fatal); |
17 | static void set_opset_bits (pTHX_ char *bitmap, SV *bitspec, int on, char *opname); |
18 | static void put_op_bitspec (pTHX_ char *optag, STRLEN len, SV *opset); |
19 | static SV *get_op_bitspec (pTHX_ char *opname, STRLEN len, int fatal); |
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20 | |
21 | |
22 | /* Initialise our private op_named_bits HV. |
23 | * It is first loaded with the name and number of each perl operator. |
24 | * Then the builtin tags :none and :all are added. |
25 | * Opcode.pm loads the standard optags from __DATA__ |
4d8e9581 |
26 | * XXX leak-alert: data allocated here is never freed, call this |
27 | * at most once |
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28 | */ |
29 | |
30 | static void |
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31 | op_names_init(pTHX) |
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32 | { |
33 | int i; |
34 | STRLEN len; |
31fb1209 |
35 | char **op_names; |
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36 | char *bitmap; |
37 | |
38 | op_named_bits = newHV(); |
31fb1209 |
39 | op_names = get_op_names(); |
3280af22 |
40 | for(i=0; i < PL_maxo; ++i) { |
e858de61 |
41 | SV *sv; |
42 | sv = newSViv(i); |
43 | SvREADONLY_on(sv); |
31fb1209 |
44 | hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0); |
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45 | } |
46 | |
cea2e8a9 |
47 | put_op_bitspec(aTHX_ ":none",0, sv_2mortal(new_opset(aTHX_ Nullsv))); |
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48 | |
cea2e8a9 |
49 | opset_all = new_opset(aTHX_ Nullsv); |
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50 | bitmap = SvPV(opset_all, len); |
51 | i = len-1; /* deal with last byte specially, see below */ |
52 | while(i-- > 0) |
53 | bitmap[i] = 0xFF; |
54 | /* Take care to set the right number of bits in the last byte */ |
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55 | bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF; |
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56 | put_op_bitspec(aTHX_ ":all",0, opset_all); /* don't mortalise */ |
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57 | } |
58 | |
59 | |
60 | /* Store a new tag definition. Always a mask. |
61 | * The tag must not already be defined. |
62 | * SV *mask is copied not referenced. |
63 | */ |
64 | |
65 | static void |
cea2e8a9 |
66 | put_op_bitspec(pTHX_ char *optag, STRLEN len, SV *mask) |
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67 | { |
68 | SV **svp; |
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69 | verify_opset(aTHX_ mask,1); |
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70 | if (!len) |
71 | len = strlen(optag); |
72 | svp = hv_fetch(op_named_bits, optag, len, 1); |
73 | if (SvOK(*svp)) |
74 | croak("Opcode tag \"%s\" already defined", optag); |
75 | sv_setsv(*svp, mask); |
76 | SvREADONLY_on(*svp); |
77 | } |
78 | |
79 | |
80 | |
81 | /* Fetch a 'bits' entry for an opname or optag (IV/PV). |
82 | * Note that we return the actual entry for speed. |
83 | * Always sv_mortalcopy() if returing it to user code. |
84 | */ |
85 | |
86 | static SV * |
cea2e8a9 |
87 | get_op_bitspec(pTHX_ char *opname, STRLEN len, int fatal) |
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88 | { |
89 | SV **svp; |
90 | if (!len) |
91 | len = strlen(opname); |
92 | svp = hv_fetch(op_named_bits, opname, len, 0); |
93 | if (!svp || !SvOK(*svp)) { |
94 | if (!fatal) |
95 | return Nullsv; |
96 | if (*opname == ':') |
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); |
103 | } |
104 | return *svp; |
105 | } |
106 | |
107 | |
108 | |
109 | static SV * |
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110 | new_opset(pTHX_ SV *old_opset) |
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111 | { |
112 | SV *opset; |
113 | if (old_opset) { |
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114 | verify_opset(aTHX_ old_opset,1); |
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115 | opset = newSVsv(old_opset); |
116 | } |
117 | else { |
8c52afec |
118 | opset = NEWSV(1156, opset_len); |
67a5ea69 |
119 | Zero(SvPVX(opset), opset_len + 1, char); |
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120 | SvCUR_set(opset, opset_len); |
121 | (void)SvPOK_only(opset); |
122 | } |
123 | /* not mortalised here */ |
124 | return opset; |
125 | } |
126 | |
127 | |
128 | static int |
cea2e8a9 |
129 | verify_opset(pTHX_ SV *opset, int fatal) |
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130 | { |
131 | char *err = Nullch; |
132 | if (!SvOK(opset)) err = "undefined"; |
133 | else if (!SvPOK(opset)) err = "wrong type"; |
134 | else if (SvCUR(opset) != opset_len) err = "wrong size"; |
135 | if (err && fatal) { |
136 | croak("Invalid opset: %s", err); |
137 | } |
138 | return !err; |
139 | } |
140 | |
141 | |
142 | static void |
cea2e8a9 |
143 | set_opset_bits(pTHX_ char *bitmap, SV *bitspec, int on, char *opname) |
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144 | { |
145 | if (SvIOK(bitspec)) { |
146 | int myopcode = SvIV(bitspec); |
147 | int offset = myopcode >> 3; |
148 | int bit = myopcode & 0x07; |
3280af22 |
149 | if (myopcode >= PL_maxo || myopcode < 0) |
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150 | croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode); |
151 | if (opcode_debug >= 2) |
ff0cee69 |
152 | warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n", |
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153 | myopcode, offset, bit, opname, (on)?"on":"off"); |
154 | if (on) |
155 | bitmap[offset] |= 1 << bit; |
156 | else |
157 | bitmap[offset] &= ~(1 << bit); |
158 | } |
159 | else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) { |
160 | |
161 | STRLEN len; |
162 | char *specbits = SvPV(bitspec, len); |
163 | if (opcode_debug >= 2) |
164 | warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off"); |
165 | if (on) |
166 | while(len-- > 0) bitmap[len] |= specbits[len]; |
167 | else |
168 | while(len-- > 0) bitmap[len] &= ~specbits[len]; |
169 | } |
170 | else |
ff0cee69 |
171 | croak("panic: invalid bitspec for \"%s\" (type %u)", |
172 | opname, (unsigned)SvTYPE(bitspec)); |
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173 | } |
174 | |
175 | |
176 | static void |
cea2e8a9 |
177 | opmask_add(pTHX_ SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */ |
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178 | { |
179 | int i,j; |
180 | char *bitmask; |
181 | STRLEN len; |
182 | int myopcode = 0; |
183 | |
cea2e8a9 |
184 | verify_opset(aTHX_ opset,1); /* croaks on bad opset */ |
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185 | |
3280af22 |
186 | if (!PL_op_mask) /* caller must ensure PL_op_mask exists */ |
187 | croak("Can't add to uninitialised PL_op_mask"); |
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188 | |
189 | /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */ |
190 | |
191 | bitmask = SvPV(opset, len); |
192 | for (i=0; i < opset_len; i++) { |
193 | U16 bits = bitmask[i]; |
194 | if (!bits) { /* optimise for sparse masks */ |
195 | myopcode += 8; |
196 | continue; |
197 | } |
3280af22 |
198 | for (j=0; j < 8 && myopcode < PL_maxo; ) |
199 | PL_op_mask[myopcode++] |= bits & (1 << j++); |
6badd1a5 |
200 | } |
201 | } |
202 | |
203 | static void |
cea2e8a9 |
204 | opmask_addlocal(pTHX_ SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */ |
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205 | { |
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206 | char *orig_op_mask = PL_op_mask; |
7766f137 |
207 | SAVEVPTR(PL_op_mask); |
ac4c12e7 |
208 | /* XXX casting to an ordinary function ptr from a member function ptr |
209 | * is disallowed by Borland |
210 | */ |
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211 | if (opcode_debug >= 2) |
51371543 |
212 | SAVEDESTRUCTOR((void(*)(void*))Perl_warn,"PL_op_mask restored"); |
3280af22 |
213 | PL_op_mask = &op_mask_buf[0]; |
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214 | if (orig_op_mask) |
3280af22 |
215 | Copy(orig_op_mask, PL_op_mask, PL_maxo, char); |
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216 | else |
3280af22 |
217 | Zero(PL_op_mask, PL_maxo, char); |
cea2e8a9 |
218 | opmask_add(aTHX_ opset); |
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219 | } |
220 | |
221 | |
222 | |
223 | MODULE = Opcode PACKAGE = Opcode |
224 | |
225 | PROTOTYPES: ENABLE |
226 | |
227 | BOOT: |
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228 | assert(PL_maxo < OP_MASK_BUF_SIZE); |
229 | opset_len = (PL_maxo + 7) / 8; |
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230 | if (opcode_debug >= 1) |
ff0cee69 |
231 | warn("opset_len %ld\n", (long)opset_len); |
cea2e8a9 |
232 | op_names_init(aTHX); |
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233 | |
8c7314f9 |
234 | void |
235 | _safe_pkg_prep(Package) |
236 | char * Package |
237 | PPCODE: |
238 | HV *hv; |
239 | ENTER; |
240 | |
241 | hv = gv_stashpv(Package, GV_ADDWARN); /* should exist already */ |
242 | |
243 | if (strNE(HvNAME(hv),"main")) { |
244 | Safefree(HvNAME(hv)); |
245 | HvNAME(hv) = savepv("main"); /* make it think it's in main:: */ |
246 | hv_store(hv,"_",1,(SV *)PL_defgv,0); /* connect _ to global */ |
247 | SvREFCNT_inc((SV *)PL_defgv); /* want to keep _ around! */ |
248 | } |
249 | LEAVE; |
250 | |
251 | |
252 | |
253 | |
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254 | |
255 | void |
9d8a25dc |
256 | _safe_call_sv(Package, mask, codesv) |
257 | char * Package |
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258 | SV * mask |
259 | SV * codesv |
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260 | PPCODE: |
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261 | char op_mask_buf[OP_MASK_BUF_SIZE]; |
262 | GV *gv; |
263 | |
264 | ENTER; |
265 | |
cea2e8a9 |
266 | opmask_addlocal(aTHX_ mask, op_mask_buf); |
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267 | |
3280af22 |
268 | save_aptr(&PL_endav); |
269 | PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */ |
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270 | |
e5125a24 |
271 | save_hptr(&PL_defstash); /* save current default stash */ |
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272 | /* the assignment to global defstash changes our sense of 'main' */ |
3280af22 |
273 | PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */ |
8c7314f9 |
274 | |
ed094faf |
275 | save_hptr(&PL_curstash); |
276 | PL_curstash = PL_defstash; |
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277 | |
278 | /* defstash must itself contain a main:: so we'll add that now */ |
279 | /* take care with the ref counts (was cause of long standing bug) */ |
280 | /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */ |
281 | gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV); |
282 | sv_free((SV*)GvHV(gv)); |
3280af22 |
283 | GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash); |
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284 | |
e5125a24 |
285 | /* %INC must be clean for use/require in compartment */ |
286 | save_hash(PL_incgv); |
7ec3aa30 |
287 | sv_free((SV*)GvHV(PL_incgv)); /* get rid of what save_hash gave us*/ |
e5125a24 |
288 | GvHV(PL_incgv) = (HV*)SvREFCNT_inc(GvHV(gv_HVadd(gv_fetchpv("INC",TRUE,SVt_PVHV)))); |
289 | |
924508f0 |
290 | PUSHMARK(SP); |
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291 | perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */ |
292 | SPAGAIN; /* for the PUTBACK added by xsubpp */ |
293 | LEAVE; |
294 | |
295 | |
296 | int |
297 | verify_opset(opset, fatal = 0) |
298 | SV *opset |
299 | int fatal |
cea2e8a9 |
300 | CODE: |
301 | RETVAL = verify_opset(aTHX_ opset,fatal); |
302 | OUTPUT: |
303 | RETVAL |
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304 | |
305 | void |
306 | invert_opset(opset) |
307 | SV *opset |
4d8e9581 |
308 | CODE: |
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309 | { |
310 | char *bitmap; |
311 | STRLEN len = opset_len; |
cea2e8a9 |
312 | opset = sv_2mortal(new_opset(aTHX_ opset)); /* verify and clone opset */ |
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313 | bitmap = SvPVX(opset); |
314 | while(len-- > 0) |
315 | bitmap[len] = ~bitmap[len]; |
3280af22 |
316 | /* take care of extra bits beyond PL_maxo in last byte */ |
317 | if (PL_maxo & 07) |
318 | bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07)); |
6badd1a5 |
319 | } |
320 | ST(0) = opset; |
321 | |
322 | |
323 | void |
324 | opset_to_ops(opset, desc = 0) |
325 | SV *opset |
326 | int desc |
4d8e9581 |
327 | PPCODE: |
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328 | { |
329 | STRLEN len; |
330 | int i, j, myopcode; |
331 | char *bitmap = SvPV(opset, len); |
31fb1209 |
332 | char **names = (desc) ? get_op_descs() : get_op_names(); |
cea2e8a9 |
333 | verify_opset(aTHX_ opset,1); |
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334 | for (myopcode=0, i=0; i < opset_len; i++) { |
335 | U16 bits = bitmap[i]; |
3280af22 |
336 | for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) { |
6badd1a5 |
337 | if ( bits & (1 << j) ) |
338 | XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0))); |
339 | } |
340 | } |
341 | } |
342 | |
343 | |
344 | void |
345 | opset(...) |
4d8e9581 |
346 | CODE: |
8063af02 |
347 | int i; |
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348 | SV *bitspec, *opset; |
349 | char *bitmap; |
350 | STRLEN len, on; |
cea2e8a9 |
351 | opset = sv_2mortal(new_opset(aTHX_ Nullsv)); |
6badd1a5 |
352 | bitmap = SvPVX(opset); |
353 | for (i = 0; i < items; i++) { |
354 | char *opname; |
355 | on = 1; |
cea2e8a9 |
356 | if (verify_opset(aTHX_ ST(i),0)) { |
6badd1a5 |
357 | opname = "(opset)"; |
358 | bitspec = ST(i); |
359 | } |
360 | else { |
361 | opname = SvPV(ST(i), len); |
362 | if (*opname == '!') { on=0; ++opname;--len; } |
cea2e8a9 |
363 | bitspec = get_op_bitspec(aTHX_ opname, len, 1); |
6badd1a5 |
364 | } |
cea2e8a9 |
365 | set_opset_bits(aTHX_ bitmap, bitspec, on, opname); |
6badd1a5 |
366 | } |
367 | ST(0) = opset; |
368 | |
369 | |
370 | #define PERMITING (ix == 0 || ix == 1) |
371 | #define ONLY_THESE (ix == 0 || ix == 2) |
372 | |
373 | void |
374 | permit_only(safe, ...) |
375 | SV *safe |
4d8e9581 |
376 | ALIAS: |
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377 | permit = 1 |
378 | deny_only = 2 |
379 | deny = 3 |
4d8e9581 |
380 | CODE: |
6badd1a5 |
381 | int i, on; |
382 | SV *bitspec, *mask; |
383 | char *bitmap, *opname; |
384 | STRLEN len; |
385 | |
386 | if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV) |
387 | croak("Not a Safe object"); |
388 | mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1); |
389 | if (ONLY_THESE) /* *_only = new mask, else edit current */ |
cea2e8a9 |
390 | sv_setsv(mask, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv))); |
4d8e9581 |
391 | else |
cea2e8a9 |
392 | verify_opset(aTHX_ mask,1); /* croaks */ |
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393 | bitmap = SvPVX(mask); |
394 | for (i = 1; i < items; i++) { |
395 | on = PERMITING ? 0 : 1; /* deny = mask bit on */ |
cea2e8a9 |
396 | if (verify_opset(aTHX_ ST(i),0)) { /* it's a valid mask */ |
6badd1a5 |
397 | opname = "(opset)"; |
398 | bitspec = ST(i); |
399 | } |
400 | else { /* it's an opname/optag */ |
401 | opname = SvPV(ST(i), len); |
402 | /* invert if op has ! prefix (only one allowed) */ |
403 | if (*opname == '!') { on = !on; ++opname; --len; } |
cea2e8a9 |
404 | bitspec = get_op_bitspec(aTHX_ opname, len, 1); /* croaks */ |
6badd1a5 |
405 | } |
cea2e8a9 |
406 | set_opset_bits(aTHX_ bitmap, bitspec, on, opname); |
6badd1a5 |
407 | } |
6b88bc9c |
408 | ST(0) = &PL_sv_yes; |
6badd1a5 |
409 | |
410 | |
411 | |
412 | void |
413 | opdesc(...) |
4d8e9581 |
414 | PPCODE: |
6badd1a5 |
415 | int i, myopcode; |
416 | STRLEN len; |
417 | SV **args; |
31fb1209 |
418 | char **op_desc = get_op_descs(); |
6badd1a5 |
419 | /* copy args to a scratch area since we may push output values onto */ |
420 | /* the stack faster than we read values off it if masks are used. */ |
79cb57f6 |
421 | args = (SV**)SvPVX(sv_2mortal(newSVpvn((char*)&ST(0), items*sizeof(SV*)))); |
6badd1a5 |
422 | for (i = 0; i < items; i++) { |
423 | char *opname = SvPV(args[i], len); |
cea2e8a9 |
424 | SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1); |
6badd1a5 |
425 | if (SvIOK(bitspec)) { |
426 | myopcode = SvIV(bitspec); |
3280af22 |
427 | if (myopcode < 0 || myopcode >= PL_maxo) |
6badd1a5 |
428 | croak("panic: opcode %d (%s) out of range",myopcode,opname); |
429 | XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0))); |
430 | } |
431 | else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) { |
432 | int b, j; |
2d8e6c8d |
433 | STRLEN n_a; |
434 | char *bitmap = SvPV(bitspec,n_a); |
6badd1a5 |
435 | myopcode = 0; |
436 | for (b=0; b < opset_len; b++) { |
437 | U16 bits = bitmap[b]; |
3280af22 |
438 | for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) |
6badd1a5 |
439 | if (bits & (1 << j)) |
440 | XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0))); |
441 | } |
442 | } |
443 | else |
ff0cee69 |
444 | croak("panic: invalid bitspec for \"%s\" (type %u)", |
445 | opname, (unsigned)SvTYPE(bitspec)); |
6badd1a5 |
446 | } |
447 | |
448 | |
449 | void |
450 | define_optag(optagsv, mask) |
451 | SV *optagsv |
452 | SV *mask |
4d8e9581 |
453 | CODE: |
6badd1a5 |
454 | STRLEN len; |
455 | char *optag = SvPV(optagsv, len); |
cea2e8a9 |
456 | put_op_bitspec(aTHX_ optag, len, mask); /* croaks */ |
6b88bc9c |
457 | ST(0) = &PL_sv_yes; |
6badd1a5 |
458 | |
459 | |
460 | void |
461 | empty_opset() |
4d8e9581 |
462 | CODE: |
cea2e8a9 |
463 | ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv)); |
6badd1a5 |
464 | |
465 | void |
466 | full_opset() |
4d8e9581 |
467 | CODE: |
cea2e8a9 |
468 | ST(0) = sv_2mortal(new_opset(aTHX_ opset_all)); |
6badd1a5 |
469 | |
470 | void |
471 | opmask_add(opset) |
472 | SV *opset |
4d8e9581 |
473 | PREINIT: |
3280af22 |
474 | if (!PL_op_mask) |
475 | Newz(0, PL_op_mask, PL_maxo, char); |
cea2e8a9 |
476 | CODE: |
477 | opmask_add(aTHX_ opset); |
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478 | |
479 | void |
480 | opcodes() |
4d8e9581 |
481 | PPCODE: |
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482 | if (GIMME == G_ARRAY) { |
483 | croak("opcodes in list context not yet implemented"); /* XXX */ |
484 | } |
485 | else { |
3280af22 |
486 | XPUSHs(sv_2mortal(newSViv(PL_maxo))); |
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487 | } |
488 | |
489 | void |
490 | opmask() |
4d8e9581 |
491 | CODE: |
cea2e8a9 |
492 | ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv)); |
3280af22 |
493 | if (PL_op_mask) { |
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494 | char *bitmap = SvPVX(ST(0)); |
495 | int myopcode; |
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496 | for(myopcode=0; myopcode < PL_maxo; ++myopcode) { |
497 | if (PL_op_mask[myopcode]) |
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498 | bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07); |
499 | } |
500 | } |
501 | |