1 /* This file is part of the Scope::Upper Perl module.
2 * See http://search.cpan.org/dist/Scope-Upper/ */
4 #define PERL_NO_GET_CONTEXT
14 # define STMT_START do
18 # define STMT_END while (0)
22 # define SU_D(X) STMT_START X STMT_END
28 # define Newx(v, n, c) New(0, v, n, c)
32 # define SvPV_const(S, L) SvPV(S, L)
35 #ifndef SvPV_nolen_const
36 # define SvPV_nolen_const(S) SvPV_nolen(S)
40 # define HvNAME_get(H) HvNAME(H)
43 #ifndef gv_fetchpvn_flags
44 # define gv_fetchpvn_flags(A, B, C, D) gv_fetchpv((A), (C), (D))
47 #ifndef PERL_MAGIC_tied
48 # define PERL_MAGIC_tied 'P'
51 #ifndef PERL_MAGIC_env
52 # define PERL_MAGIC_env 'E'
55 #define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
60 void (*handler)(pTHX_ void *);
63 #define SU_UD_DEPTH(U) (((su_ud_common *) (U))->depth)
64 #define SU_UD_ORIGIN(U) (((su_ud_common *) (U))->origin)
65 #define SU_UD_HANDLER(U) (((su_ud_common *) (U))->handler)
67 #define SU_UD_FREE(U) do { \
68 if (SU_UD_ORIGIN(U)) Safefree(SU_UD_ORIGIN(U)); \
77 STATIC void su_call(pTHX_ void *ud_) {
78 su_ud_reap *ud = (su_ud_reap *) ud_;
79 #if SU_HAS_PERL(5, 10, 0)
80 I32 dieing = PL_op->op_type == OP_DIE;
85 SU_D(PerlIO_printf(Perl_debug_log, "%p: @@@ call at %d (save is %d)\n",
86 ud, PL_scopestack_ix, PL_savestack_ix));
93 /* If cxstack_ix isn't incremented there, the eval context will be overwritten
94 * when the new sub scope will be created in call_sv. */
96 #if SU_HAS_PERL(5, 10, 0)
98 if (cxstack_ix < cxstack_max)
101 cxstack_ix = Perl_cxinc(aTHX);
104 call_sv(ud->cb, G_VOID);
106 #if SU_HAS_PERL(5, 10, 0)
107 if (dieing && cxstack_ix > 0)
117 SvREFCNT_dec(ud->cb);
121 STATIC void su_reap(pTHX_ void *ud) {
122 #define su_reap(U) su_reap(aTHX_ (U))
123 SU_D(PerlIO_printf(Perl_debug_log, "%p: === reap at %d (save is %d)\n",
124 ud, PL_scopestack_ix, PL_savestack_ix));
125 SAVEDESTRUCTOR_X(su_call, ud);
126 SU_D(PerlIO_printf(Perl_debug_log, "%p: savestack is now at %d, base at %d\n",
128 PL_scopestack[PL_scopestack_ix]));
138 #ifndef SvCANEXISTDELETE
139 # define SvCANEXISTDELETE(sv) \
141 || ((mg = mg_find((SV *) sv, PERL_MAGIC_tied)) \
142 && (stash = SvSTASH(SvRV(SvTIED_obj((SV *) sv, mg)))) \
143 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE) \
144 && gv_fetchmethod_autoload(stash, "DELETE", TRUE) \
149 STATIC I32 su_hv_preeminent(pTHX_ HV *hv, SV *keysv) {
150 #define su_hv_preeminent(H, K) su_hv_preeminent(aTHX_ (H), (K))
156 if (SvCANEXISTDELETE(hv) || mg_find((SV *) hv, PERL_MAGIC_env))
157 return hv_exists_ent(hv, keysv, 0);
162 STATIC void su_save_helem(pTHX_ HV *hv, SV *keysv, SV **svp, I32 preeminent) {
163 #define su_save_helem(H, K, S, P) su_save_helem(aTHX_ (H), (K), (S), (P))
164 if (HvNAME_get(hv) && isGV(*svp)) {
165 save_gp((GV *) *svp, 0);
170 const char * const key = SvPV_const(keysv, keylen);
171 SAVEDELETE(hv, savepvn(key, keylen),
172 SvUTF8(keysv) ? -(I32)keylen : (I32)keylen);
174 save_helem(hv, keysv, svp);
178 STATIC void su_localize(pTHX_ void *ud_) {
179 #define su_localize(U) su_localize(aTHX_ (U))
180 su_ud_localize *ud = (su_ud_localize *) ud_;
188 if (SvTYPE(sv) >= SVt_PVGV) {
192 t = SvTYPE(SvRV(val));
196 const char *p = SvPV_const(sv, len), *s;
197 for (s = p, l = len; l > 0 && isSPACE(*s); ++s, --l) { }
203 case '$': t = SVt_PV; break;
204 case '@': t = SVt_PVAV; break;
205 case '%': t = SVt_PVHV; break;
206 case '&': t = SVt_PVCV; break;
207 case '*': t = SVt_PVGV; break;
210 if (SvROK(val) && !sv_isobject(val)) {
211 t = SvTYPE(SvRV(val));
220 gv = gv_fetchpvn_flags(s, l, GV_ADDMULTI, SVt_PVGV);
224 SV *z = newSV_type(t);
225 PerlIO_printf(Perl_debug_log, "%p: === localize a %s at %d (save is %d)\n",
226 ud, sv_reftype(z, 0),
227 PL_scopestack_ix, PL_savestack_ix);
231 /* Inspired from Alias.pm */
235 I32 idx = SvIV(elem);
237 SV **svp = av_fetch(av, idx, 1);
238 if (!*svp || *svp == &PL_sv_undef) croak(PL_no_aelem, idx);
239 save_aelem(av, idx, svp);
248 I32 preeminent = su_hv_preeminent(hv, elem);
249 HE *he = hv_fetch_ent(hv, elem, 1, 0);
250 SV **svp = he ? &HeVAL(he) : NULL;
251 if (!svp || *svp == &PL_sv_undef) croak("Modification of non-creatable hash value attempted, subscript \"%s\"", SvPV_nolen_const(*svp));
252 su_save_helem(hv, elem, svp, preeminent);
259 save_gp(gv, 1); /* hide previous entry in symtab */
266 gv = (GV *) save_scalar(gv);
273 SU_D(PerlIO_printf(Perl_debug_log, "%p: savestack is now at %d, base at %d\n",
275 PL_scopestack[PL_scopestack_ix]));
278 SvSetMagicSV((SV *) gv, val);
280 SvREFCNT_dec(ud->elem);
281 SvREFCNT_dec(ud->val);
282 SvREFCNT_dec(ud->sv);
288 # define SU_CXNAME PL_block_type[CxTYPE(&cxstack[cxstack_ix])]
290 # define SU_CXNAME "XXX"
294 STATIC void su_pop(pTHX_ void *ud) {
295 #define su_pop(U) su_pop(aTHX_ (U))
296 I32 depth, base, mark, *origin;
297 depth = SU_UD_DEPTH(ud);
299 SU_D(PerlIO_printf(Perl_debug_log, "%p: --- pop %s at %d from %d to %d [%d]\n",
301 PL_scopestack_ix, PL_savestack_ix,
302 PL_scopestack[PL_scopestack_ix],
305 origin = SU_UD_ORIGIN(ud);
306 mark = origin[depth];
307 base = origin[depth - 1];
309 SU_D(PerlIO_printf(Perl_debug_log, "%p: clean from %d down to %d\n",
313 PL_savestack_ix = mark;
316 PL_savestack_ix = base;
318 SU_UD_DEPTH(ud) = depth;
319 SU_D(PerlIO_printf(Perl_debug_log, "%p: save new destructor at %d [%d]\n",
320 ud, PL_savestack_ix, depth));
321 SAVEDESTRUCTOR_X(su_pop, ud);
322 SU_D(PerlIO_printf(Perl_debug_log, "%p: pop end at at %d [%d]\n",
323 ud, PL_savestack_ix, depth));
325 SU_UD_HANDLER(ud)(aTHX_ ud);
329 STATIC I32 su_init(pTHX_ I32 level, void *ud, I32 size) {
330 #define su_init(L, U, S) su_init(aTHX_ (L), (U), (S))
331 I32 i, depth = 0, *origin;
334 SU_D(PerlIO_printf(Perl_debug_log, "%p: ### init for level %d\n", ud, level));
336 for (i = 0; i < level; ++i) {
337 PERL_CONTEXT *cx = &cxstack[cxstack_ix - i];
338 switch (CxTYPE(cx)) {
339 #if SU_HAS_PERL(5, 11, 0)
342 case CXt_LOOP_LAZYSV:
343 case CXt_LOOP_LAZYIV:
347 SU_D(PerlIO_printf(Perl_debug_log, "%p: cx %d is loop\n", ud, i));
351 SU_D(PerlIO_printf(Perl_debug_log, "%p: cx %d is normal\n", ud, i));
356 SU_D(PerlIO_printf(Perl_debug_log, "%p: depth is %d\n", ud, depth));
358 Newx(origin, depth + 1, I32);
359 origin[0] = PL_scopestack[PL_scopestack_ix - depth];
360 PL_scopestack[PL_scopestack_ix - depth] += size;
361 for (i = depth - 1; i >= 1; --i) {
362 I32 j = PL_scopestack_ix - i;
363 origin[depth - i] = PL_scopestack[j];
364 PL_scopestack[j] += 3;
366 origin[depth] = PL_savestack_ix;
369 PerlIO_printf(Perl_debug_log, "%p: d=%d s=%d x=%d c=%d o=%d\n", ud,
370 depth, 0, PL_scopestack_ix - 1, PL_savestack_ix, origin[depth]);
371 for (i = depth - 1; i >= 0; --i) {
372 I32 x = PL_scopestack_ix - depth + i;
373 PerlIO_printf(Perl_debug_log, "%p: d=%d s=%d x=%d c=%d o=%d\n", ud,
374 i, depth - i, x, PL_scopestack[x], origin[i]);
378 SU_UD_ORIGIN(ud) = origin;
379 SU_UD_DEPTH(ud) = depth;
383 #define SU_GET_LEVEL(A) \
391 if (level > cxstack_ix) \
394 /* --- XS ------------------------------------------------------------------ */
396 MODULE = Scope::Upper PACKAGE = Scope::Upper
404 RETVAL = newSViv(cxstack_ix);
416 Newx(ud, 1, su_ud_reap);
417 SU_UD_ORIGIN(ud) = NULL;
418 SU_UD_HANDLER(ud) = su_reap;
419 ud->cb = newSVsv(hook);
422 I32 depth = su_init(level, ud, 3);
423 SU_D(PerlIO_printf(Perl_debug_log, "%p: set original destructor at %d [%d]\n",
424 ud, PL_savestack_ix, depth));
425 SAVEDESTRUCTOR_X(su_pop, ud);
431 localize(SV *sv, SV *val, ...)
438 Newx(ud, 1, su_ud_localize);
439 SU_UD_ORIGIN(ud) = NULL;
440 SU_UD_HANDLER(ud) = su_localize;
443 ud->val = newSVsv(val);
447 I32 depth = su_init(level, ud, 3);
448 SU_D(PerlIO_printf(Perl_debug_log, "%p: set original destructor at %d [%d]\n",
449 ud, PL_savestack_ix, depth));
450 SAVEDESTRUCTOR_X(su_pop, ud);
456 localize_elem(SV *sv, SV *elem, SV *val, ...)
463 Newx(ud, 1, su_ud_localize);
464 SU_UD_ORIGIN(ud) = NULL;
465 SU_UD_HANDLER(ud) = su_localize;
468 ud->val = newSVsv(val);
473 I32 depth = su_init(level, ud, 4);
474 SU_D(PerlIO_printf(Perl_debug_log, "%p: set original destructor at %d [%d]\n",
475 ud, PL_savestack_ix, depth));
476 SAVEDESTRUCTOR_X(su_pop, ud);