/* --- Compatibility ------------------------------------------------------- */
+#ifndef NOOP
+# define NOOP
+#endif
+
+#ifndef dNOOP
+# define dNOOP
+#endif
+
+#ifndef dVAR
+# define dVAR dNOOP
+#endif
+
+#ifndef MUTABLE_SV
+# define MUTABLE_SV(S) ((SV *) (S))
+#endif
+
+#ifndef MUTABLE_AV
+# define MUTABLE_AV(A) ((AV *) (A))
+#endif
+
+#ifndef MUTABLE_CV
+# define MUTABLE_CV(C) ((CV *) (C))
+#endif
+
#ifndef PERL_UNUSED_VAR
# define PERL_UNUSED_VAR(V)
#endif
# define Newx(v, n, c) New(0, v, n, c)
#endif
+#ifdef DEBUGGING
+# ifdef PoisonNew
+# define SU_POISON(D, N, T) PoisonNew((D), (N), T)
+# elif defined(Poison)
+# define SU_POISON(D, N, T) Poison((D), (N), T)
+# endif
+#endif
+#ifndef SU_POISON
+# define SU_POISON(D, N, T) NOOP
+#endif
+
+#ifndef newSV_type
+STATIC SV *su_newSV_type(pTHX_ svtype t) {
+ SV *sv = newSV(0);
+ SvUPGRADE(sv, t);
+ return sv;
+}
+# define newSV_type(T) su_newSV_type(aTHX_ (T))
+#endif
+
#ifndef SvPV_const
# define SvPV_const(S, L) SvPV(S, L)
#endif
+#ifndef SvPVX_const
+# define SvPVX_const(S) SvPVX(S)
+#endif
+
#ifndef SvPV_nolen_const
# define SvPV_nolen_const(S) SvPV_nolen(S)
#endif
#ifndef SvREFCNT_inc_simple_void
-# define SvREFCNT_inc_simple_void(sv) SvREFCNT_inc(sv)
+# define SvREFCNT_inc_simple_void(sv) ((void) SvREFCNT_inc(sv))
+#endif
+
+#ifndef mPUSHi
+# define mPUSHi(I) PUSHs(sv_2mortal(newSViv(I)))
+#endif
+
+#ifndef GvCV_set
+# define GvCV_set(G, C) (GvCV(G) = (C))
+#endif
+
+#ifndef CvGV_set
+# define CvGV_set(C, G) (CvGV(C) = (G))
+#endif
+
+#ifndef CvSTASH_set
+# define CvSTASH_set(C, S) (CvSTASH(C) = (S))
+#endif
+
+#ifndef CvISXSUB
+# define CvISXSUB(C) CvXSUB(C)
+#endif
+
+#ifndef CxHASARGS
+# define CxHASARGS(C) ((C)->blk_sub.hasargs)
#endif
#ifndef HvNAME_get
#endif
#define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
+#define SU_HAS_PERL_EXACT(R, V, S) ((PERL_REVISION == (R)) && (PERL_VERSION == (V)) && (PERL_SUBVERSION == (S)))
/* --- Threads and multiplicity -------------------------------------------- */
-#ifndef NOOP
-# define NOOP
-#endif
-
-#ifndef dNOOP
-# define dNOOP
-#endif
-
#ifndef SU_MULTIPLICITY
# if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
# define SU_MULTIPLICITY 1
# define MY_CXT_CLONE NOOP
#endif
+/* --- unwind() global storage --------------------------------------------- */
+
+typedef struct {
+ I32 cxix;
+ I32 items;
+ SV **savesp;
+ LISTOP return_op;
+ OP proxy_op;
+} su_unwind_storage;
+
+/* --- uplevel() data tokens and global storage ---------------------------- */
+
+typedef struct {
+ void *next;
+
+ I32 cxix;
+ CV *target;
+ CV *callback;
+ bool died;
+
+ PERL_SI *si;
+ PERL_SI *old_curstackinfo;
+ AV *old_mainstack;
+
+ I32 old_depth;
+ COP *old_curcop;
+
+ bool old_catch;
+ OP *old_op;
+} su_uplevel_ud;
+
+STATIC su_uplevel_ud *su_uplevel_ud_new(pTHX) {
+#define su_uplevel_ud_new() su_uplevel_ud_new(aTHX)
+ su_uplevel_ud *sud;
+ PERL_SI *si;
+
+ Newx(sud, 1, su_uplevel_ud);
+ sud->next = NULL;
+
+ Newx(si, 1, PERL_SI);
+ si->si_stack = newAV();
+ AvREAL_off(si->si_stack);
+ si->si_cxstack = NULL;
+ si->si_cxmax = 0;
+
+ sud->si = si;
+
+ return sud;
+}
+
+STATIC void su_uplevel_ud_delete(pTHX_ su_uplevel_ud *sud) {
+#define su_uplevel_ud_delete(S) su_uplevel_ud_delete(aTHX_ (S))
+ PERL_SI *si = sud->si;
+
+ Safefree(si->si_cxstack);
+ SvREFCNT_dec(si->si_stack);
+ Safefree(si);
+ Safefree(sud);
+
+ return;
+}
+
+typedef struct {
+ su_uplevel_ud *root;
+ I32 count;
+} su_uplevel_storage;
+
+#ifndef SU_UPLEVEL_STORAGE_SIZE
+# define SU_UPLEVEL_STORAGE_SIZE 4
+#endif
+
/* --- Global data --------------------------------------------------------- */
#define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
typedef struct {
- int stack_placeholder;
- I32 cxix;
- I32 items;
- SV **savesp;
- OP fakeop;
+ char *stack_placeholder;
+ su_unwind_storage unwind_storage;
+ su_uplevel_storage uplevel_storage;
} my_cxt_t;
START_MY_CXT
/* --- Stack manipulations ------------------------------------------------- */
-#define SU_SAVE_DESTRUCTOR_SIZE 3
-#define SU_SAVE_INT_SIZE 3
+#define SU_SAVE_PLACEHOLDER() save_pptr(&MY_CXT.stack_placeholder)
+
+#define SU_SAVE_DESTRUCTOR_SIZE 3
+#define SU_SAVE_PLACEHOLDER_SIZE 3
+
+#define SU_SAVE_SCALAR_SIZE 3
+
+#define SU_SAVE_ARY_SIZE 3
+#define SU_SAVE_AELEM_SIZE 4
+#ifdef SAVEADELETE
+# define SU_SAVE_ADELETE_SIZE 3
+#else
+# define SU_SAVE_ADELETE_SIZE SU_SAVE_DESTRUCTOR_SIZE
+#endif
+#if SU_SAVE_AELEM_SIZE < SU_SAVE_ADELETE_SIZE
+# define SU_SAVE_AELEM_OR_ADELETE_SIZE SU_SAVE_ADELETE_SIZE
+#else
+# define SU_SAVE_AELEM_OR_ADELETE_SIZE SU_SAVE_AELEM_SIZE
+#endif
+
+#define SU_SAVE_HASH_SIZE 3
+#define SU_SAVE_HELEM_SIZE 4
+#define SU_SAVE_HDELETE_SIZE 4
+#if SU_SAVE_HELEM_SIZE < SU_SAVE_HDELETE_SIZE
+# define SU_SAVE_HELEM_OR_HDELETE_SIZE SU_SAVE_HDELETE_SIZE
+#else
+# define SU_SAVE_HELEM_OR_HDELETE_SIZE SU_SAVE_HELEM_SIZE
+#endif
+
+#define SU_SAVE_GVCV_SIZE SU_SAVE_DESTRUCTOR_SIZE
+
+#if !SU_HAS_PERL(5, 8, 9)
+# define SU_SAVE_GP_SIZE 6
+#elif !SU_HAS_PERL(5, 13, 0) || (SU_RELEASE && SU_HAS_PERL_EXACT(5, 13, 0))
+# define SU_SAVE_GP_SIZE 3
+#elif !SU_HAS_PERL(5, 13, 8)
+# define SU_SAVE_GP_SIZE 4
+#else
+# define SU_SAVE_GP_SIZE 3
+#endif
#ifndef SvCANEXISTDELETE
# define SvCANEXISTDELETE(sv) \
}
}
+/* ... Saving code slots from a glob ....................................... */
+
+#if !SU_HAS_PERL(5, 10, 0) && !defined(mro_method_changed_in)
+# define mro_method_changed_in(G) PL_sub_generation++
+#endif
+
+typedef struct {
+ GV *gv;
+ CV *old_cv;
+} su_save_gvcv_ud;
+
+STATIC void su_restore_gvcv(pTHX_ void *ud_) {
+ su_save_gvcv_ud *ud = ud_;
+ GV *gv = ud->gv;
+
+ GvCV_set(gv, ud->old_cv);
+ GvCVGEN(gv) = 0;
+ mro_method_changed_in(GvSTASH(gv));
+
+ Safefree(ud);
+}
+
+STATIC void su_save_gvcv(pTHX_ GV *gv) {
+#define su_save_gvcv(G) su_save_gvcv(aTHX_ (G))
+ su_save_gvcv_ud *ud;
+
+ Newx(ud, 1, su_save_gvcv_ud);
+ ud->gv = gv;
+ ud->old_cv = GvCV(gv);
+
+ GvCV_set(gv, NULL);
+ GvCVGEN(gv) = 0;
+ mro_method_changed_in(GvSTASH(gv));
+
+ SAVEDESTRUCTOR_X(su_restore_gvcv, ud);
+}
+
/* --- Actions ------------------------------------------------------------- */
typedef struct {
svtype type;
} su_ud_localize;
-STATIC void su_ud_localize_init(pTHX_ su_ud_localize *ud, SV *sv, SV *val, SV *elem) {
+#define SU_UD_LOCALIZE_FREE(U) STMT_START { \
+ SvREFCNT_dec((U)->elem); \
+ SvREFCNT_dec((U)->val); \
+ SvREFCNT_dec((U)->sv); \
+ SU_UD_FREE(U); \
+} STMT_END
+
+STATIC I32 su_ud_localize_init(pTHX_ su_ud_localize *ud, SV *sv, SV *val, SV *elem) {
#define su_ud_localize_init(UD, S, V, E) su_ud_localize_init(aTHX_ (UD), (S), (V), (E))
UV deref = 0;
svtype t = SVt_NULL;
+ I32 size;
SvREFCNT_inc_simple_void(sv);
switch (t) {
case SVt_PVAV:
+ size = elem ? SU_SAVE_AELEM_OR_ADELETE_SIZE
+ : SU_SAVE_ARY_SIZE;
+ deref = 0;
+ break;
case SVt_PVHV:
- case SVt_PVCV:
+ size = elem ? SU_SAVE_HELEM_OR_HDELETE_SIZE
+ : SU_SAVE_HASH_SIZE;
+ deref = 0;
+ break;
case SVt_PVGV:
+ size = SU_SAVE_GP_SIZE;
deref = 0;
+ break;
+ case SVt_PVCV:
+ size = SU_SAVE_GVCV_SIZE;
+ deref = 0;
+ break;
default:
+ size = SU_SAVE_SCALAR_SIZE;
break;
}
/* When deref is set, val isn't NULL */
ud->val = val ? newSVsv(deref ? SvRV(val) : val) : NULL;
ud->elem = SvREFCNT_inc(elem);
ud->type = t;
+
+ return size;
}
STATIC void su_localize(pTHX_ void *ud_) {
save_gp(gv, 1); /* hide previous entry in symtab */
break;
case SVt_PVCV:
- SAVESPTR(GvCV(gv));
- GvCV(gv) = NULL;
+ su_save_gvcv(gv);
break;
default:
gv = (GV *) save_scalar(gv);
SvSetMagicSV((SV *) gv, val);
done:
- SvREFCNT_dec(ud->elem);
- SvREFCNT_dec(ud->val);
- SvREFCNT_dec(ud->sv);
- SU_UD_FREE(ud);
+ SU_UD_LOCALIZE_FREE(ud);
}
/* --- Pop a context back -------------------------------------------------- */
SU_UD_DEPTH(ud) = --depth;
if (depth > 0) {
- I32 i = 1, pad;
+ I32 pad;
- if (pad = SU_UD_PAD(ud)) {
+ if ((pad = SU_UD_PAD(ud))) {
dMY_CXT;
do {
- save_int(&MY_CXT.stack_placeholder);
+ SU_D(PerlIO_printf(Perl_debug_log,
+ "%p: push a pad slot at depth=%2d scope_ix=%2d save_ix=%2d\n",
+ ud, depth, PL_scopestack_ix, PL_savestack_ix));
+ SU_SAVE_PLACEHOLDER();
} while (--pad);
}
- SAVEDESTRUCTOR_X(su_pop, ud);
-
- /* Skip depths corresponding to scopes for which leave_scope() might not be
- * called. */
- while (depth > 1 && PL_scopestack_ix >= i) {
- I32 j = PL_scopestack[PL_scopestack_ix - i];
-
- if (j < PL_savestack_ix)
- break;
-
- SU_D(PerlIO_printf(Perl_debug_log,
- "%p: skip scope%*cat depth=%2d scope_ix=%2d new_top=%2d >= cur_base=%2d\n",
- ud, 6, ' ', depth, PL_scopestack_ix - i, j, PL_savestack_ix));
-
- SU_UD_DEPTH(ud) = --depth;
-
- ++i;
- }
SU_D(PerlIO_printf(Perl_debug_log,
"%p: push destructor at depth=%2d scope_ix=%2d save_ix=%2d\n",
ud, depth, PL_scopestack_ix, PL_savestack_ix));
+ SAVEDESTRUCTOR_X(su_pop, ud);
} else {
SU_UD_HANDLER(ud)(aTHX_ ud);
}
/* --- Initialize the stack and the action userdata ------------------------ */
-STATIC I32 su_init(pTHX_ I32 cxix, void *ud, I32 size) {
-#define su_init(L, U, S) su_init(aTHX_ (L), (U), (S))
+STATIC I32 su_init(pTHX_ void *ud, I32 cxix, I32 size) {
+#define su_init(U, C, S) su_init(aTHX_ (U), (C), (S))
I32 i, depth = 1, pad, offset, *origin;
SU_D(PerlIO_printf(Perl_debug_log, "%p: ### init for cx %d\n", ud, cxix));
pad = 0;
else {
I32 extra = size - SU_SAVE_DESTRUCTOR_SIZE;
- pad = extra / SU_SAVE_INT_SIZE + ((extra % SU_SAVE_INT_SIZE) ? 1 : 0);
+ pad = extra / SU_SAVE_PLACEHOLDER_SIZE;
+ if (extra % SU_SAVE_PLACEHOLDER_SIZE)
+ ++pad;
}
- offset = SU_SAVE_DESTRUCTOR_SIZE + SU_SAVE_INT_SIZE * pad;
+ offset = SU_SAVE_DESTRUCTOR_SIZE + SU_SAVE_PLACEHOLDER_SIZE * pad;
SU_D(PerlIO_printf(Perl_debug_log, "%p: size=%d pad=%d offset=%d\n",
ud, size, pad, offset));
SU_D(PerlIO_printf(Perl_debug_log,
"%p: push a fake slot at scope_ix=%2d save_ix=%2d\n",
ud, PL_scopestack_ix, PL_savestack_ix));
- save_int(&MY_CXT.stack_placeholder);
+ SU_SAVE_PLACEHOLDER();
} while (PL_savestack_ix + SU_SAVE_DESTRUCTOR_SIZE
<= PL_scopestack[PL_scopestack_ix - 1]);
}
STATIC void su_unwind(pTHX_ void *ud_) {
dMY_CXT;
- I32 cxix = MY_CXT.cxix;
- I32 items = MY_CXT.items - 1;
- SV **savesp = MY_CXT.savesp;
+ I32 cxix = MY_CXT.unwind_storage.cxix;
+ I32 items = MY_CXT.unwind_storage.items - 1;
+ SV **savesp = MY_CXT.unwind_storage.savesp;
I32 mark;
PERL_UNUSED_VAR(ud_);
items, PL_stack_sp - PL_stack_base, *PL_markstack_ptr, mark);
});
- PL_op = PL_ppaddr[OP_RETURN](aTHX);
+ PL_op = (OP *) &(MY_CXT.unwind_storage.return_op);
+ PL_op = PL_op->op_ppaddr(aTHX);
+
*PL_markstack_ptr = mark;
- MY_CXT.fakeop.op_next = PL_op;
- PL_op = &(MY_CXT.fakeop);
+ MY_CXT.unwind_storage.proxy_op.op_next = PL_op;
+ PL_op = &(MY_CXT.unwind_storage.proxy_op);
+}
+
+/* --- Uplevel ------------------------------------------------------------- */
+
+#ifndef OP_GIMME_REVERSE
+STATIC U8 su_op_gimme_reverse(U8 gimme) {
+ switch (gimme) {
+ case G_VOID:
+ return OPf_WANT_VOID;
+ case G_ARRAY:
+ return OPf_WANT_LIST;
+ default:
+ break;
+ }
+
+ return OPf_WANT_SCALAR;
+}
+#define OP_GIMME_REVERSE(G) su_op_gimme_reverse(G)
+#endif
+
+#define SU_UPLEVEL_SAVE(f, t) STMT_START { sud->old_##f = PL_##f; PL_##f = (t); } STMT_END
+#define SU_UPLEVEL_RESTORE(f) STMT_START { PL_##f = sud->old_##f; } STMT_END
+
+STATIC su_uplevel_ud *su_uplevel_storage_new(pTHX) {
+#define su_uplevel_storage_new() su_uplevel_storage_new(aTHX)
+ su_uplevel_ud *sud;
+ dMY_CXT;
+
+ sud = MY_CXT.uplevel_storage.root;
+ if (sud) {
+ MY_CXT.uplevel_storage.root = sud->next;
+ MY_CXT.uplevel_storage.count--;
+ } else {
+ sud = su_uplevel_ud_new();
+ }
+
+ return sud;
+}
+
+STATIC void su_uplevel_storage_delete(pTHX_ su_uplevel_ud *sud) {
+#define su_uplevel_storage_delete(S) su_uplevel_storage_delete(aTHX_ (S))
+ dMY_CXT;
+
+ if (MY_CXT.uplevel_storage.count >= SU_UPLEVEL_STORAGE_SIZE) {
+ su_uplevel_ud_delete(sud);
+ } else {
+ sud->next = MY_CXT.uplevel_storage.root;
+ MY_CXT.uplevel_storage.root = sud;
+ MY_CXT.uplevel_storage.count++;
+ }
+}
+
+#define SU_HAS_EXT_MAGIC SU_HAS_PERL(5, 8, 0)
+
+#if SU_HAS_EXT_MAGIC && !SU_HAS_PERL(5, 13, 7)
+
+STATIC int su_uplevel_restore_free(pTHX_ SV *sv, MAGIC *mg) {
+ su_uplevel_storage_delete((su_uplevel_ud *) mg->mg_ptr);
+
+ return 0;
+}
+
+STATIC MGVTBL su_uplevel_restore_vtbl = {
+ 0,
+ 0,
+ 0,
+ 0,
+ su_uplevel_restore_free
+};
+
+#endif /* SU_HAS_EXT_MAGIC && !SU_HAS_PERL(5, 13, 7) */
+
+STATIC void su_uplevel_restore(pTHX_ void *sus_) {
+ su_uplevel_ud *sud = sus_;
+ const PERL_CONTEXT *sub_cx;
+ PERL_SI *cur = sud->old_curstackinfo;
+ PERL_SI *si = sud->si;
+
+ sub_cx = cxstack + sud->cxix;
+
+ /* When we reach this place, POPSUB has already been called (with our fake
+ * argarray). GvAV(PL_defgv) points to the savearray (that is, what @_ was
+ * before uplevel). argarray is either the fake AV we created in su_uplevel()
+ * or some empty replacement POPSUB creates when @_ is reified. In both cases
+ * we have to destroy it before the context stack is swapped back to its
+ * original state. */
+ SvREFCNT_dec(sub_cx->blk_sub.argarray);
+
+ /* PUSHSUB was exerted with the original callback, but after calling
+ * pp_entersub() we hijacked the blk_sub.cv member of the fresh sub context
+ * with the renamed CV. Thus POPSUB and LEAVESUB applied to this CV, not the
+ * original. Repair this imbalance right now. */
+ if (!(CvDEPTH(sud->callback) = sub_cx->blk_sub.olddepth))
+ LEAVESUB(sud->callback);
+
+ /* Free the renamed cv. */
+ {
+ CV *renamed_cv = sub_cx->blk_sub.cv;
+ CvDEPTH(renamed_cv) = 0;
+ SvREFCNT_dec(renamed_cv);
+ }
+
+ CATCH_SET(sud->old_catch);
+
+ SU_UPLEVEL_RESTORE(op);
+
+ /* stack_grow() wants PL_curstack so restore the old stack first */
+ if (PL_curstackinfo == si) {
+ PL_curstack = cur->si_stack;
+ if (sud->old_mainstack)
+ SU_UPLEVEL_RESTORE(mainstack);
+ SU_UPLEVEL_RESTORE(curstackinfo);
+
+ if (sud->died) {
+ CV *target_cv = sud->target;
+ I32 levels = 0, i;
+
+ /* When we die, the depth of the target CV is not updated because of the
+ * stack switcheroo. So we have to look at all the frames between the
+ * uplevel call and the catch block to count how many call frames to the
+ * target CV were skipped. */
+ for (i = cur->si_cxix; i > sud->cxix; i--) {
+ register const PERL_CONTEXT *cx = cxstack + i;
+
+ if (CxTYPE(cx) == CXt_SUB) {
+ if (cx->blk_sub.cv == target_cv)
+ ++levels;
+ }
+ }
+
+ /* If we died, the replacement stack was already unwinded to the first
+ * eval frame, and all the contexts down there were popped. We don't have
+ * to pop manually any context of the original stack, because they must
+ * have been in the replacement stack as well (since the second was copied
+ * from the first). Thus we only have to make sure the original stack index
+ * points to the context just below the first eval scope under the target
+ * frame. */
+ for (; i >= 0; i--) {
+ register const PERL_CONTEXT *cx = cxstack + i;
+
+ switch (CxTYPE(cx)) {
+ case CXt_SUB:
+ if (cx->blk_sub.cv == target_cv)
+ ++levels;
+ break;
+ case CXt_EVAL:
+ goto found_it;
+ break;
+ default:
+ break;
+ }
+ }
+
+found_it:
+ CvDEPTH(target_cv) = sud->old_depth - levels;
+ PL_curstackinfo->si_cxix = i - 1;
+
+#if !SU_HAS_PERL(5, 13, 1)
+ /* Since $@ was maybe localized between the target frame and the uplevel
+ * call, we forcefully flush the save stack to get rid of it and then
+ * reset $@ to its proper value. Note that the the call to
+ * su_uplevel_restore() must happen before the "reset $@" item of the save
+ * stack is processed, as uplevel was called after the localization.
+ * Andrew's changes to how $@ was handled, which were mainly integrated
+ * between perl 5.13.0 and 5.13.1, fixed this. */
+ if (ERRSV && SvTRUE(ERRSV)) {
+ register const PERL_CONTEXT *cx = cxstack + i; /* This is the eval scope */
+ SV *errsv = SvREFCNT_inc(ERRSV);
+ PL_scopestack_ix = cx->blk_oldscopesp;
+ leave_scope(PL_scopestack[PL_scopestack_ix]);
+ sv_setsv(ERRSV, errsv);
+ SvREFCNT_dec(errsv);
+ }
+#endif
+ }
+ }
+
+ SU_UPLEVEL_RESTORE(curcop);
+
+ SvREFCNT_dec(sud->target);
+
+ PL_stack_base = AvARRAY(cur->si_stack);
+ PL_stack_sp = PL_stack_base + AvFILLp(cur->si_stack);
+ PL_stack_max = PL_stack_base + AvMAX(cur->si_stack);
+
+ /* When an exception is thrown from the uplevel'd subroutine,
+ * su_uplevel_restore() may be called by the LEAVE in die_unwind() (renamed
+ * die_where() in more recent perls), which has the sad habit of keeping a
+ * pointer to the current context frame across this call. This means that we
+ * can't free the temporary context stack we used for the uplevel call right
+ * now, or that pointer upwards would point to garbage. */
+#if SU_HAS_PERL(5, 13, 7)
+ /* This issue has been fixed in perl with commit 8f89e5a9, which was made
+ * public in perl 5.13.7. */
+ su_uplevel_storage_delete(sud);
+#elif SU_HAS_EXT_MAGIC
+ /* If 'ext' magic is available, we work around this by attaching the state
+ * data to a scalar that will be freed "soon". */
+ {
+ SV *sv = sv_newmortal();
+
+ sv_magicext(sv, NULL, PERL_MAGIC_ext, &su_uplevel_restore_vtbl,
+ (const char *) sud, 0);
+ }
+#else
+ /* Otherwise, we just enqueue it back in the global storage list. */
+ {
+ dMY_CXT;
+
+ sud->next = MY_CXT.uplevel_storage.root;
+ MY_CXT.uplevel_storage.root = sud;
+ MY_CXT.uplevel_storage.count++;
+ }
+#endif
+
+ return;
+}
+
+STATIC CV *su_cv_clone(pTHX_ CV *proto, GV *gv) {
+#define su_cv_clone(P, G) su_cv_clone(aTHX_ (P), (G))
+ dVAR;
+ AV *protopadlist = CvPADLIST(proto);
+ const AV *protopadname = (const AV *) *av_fetch(protopadlist, 0, FALSE);
+ SV **pname = AvARRAY(protopadname);
+ const I32 fpadlist = AvFILLp(protopadlist);
+ const I32 fpadname = AvFILLp(protopadname);
+ AV *padlist, *padname;
+ CV *cv;
+
+ cv = MUTABLE_CV(newSV_type(SvTYPE(proto)));
+
+ CvFLAGS(cv) = CvFLAGS(proto);
+#ifdef CVf_CVGV_RC
+ CvFLAGS(cv) &= ~CVf_CVGV_RC;
+#endif
+ CvDEPTH(cv) = CvDEPTH(proto);
+#ifdef USE_ITHREADS
+ CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) : savepv(CvFILE(proto));
+#else
+ CvFILE(cv) = CvFILE(proto);
+#endif
+
+ CvGV_set(cv, gv);
+ CvSTASH_set(cv, CvSTASH(proto));
+ /* Commit 4c74a7df, publicized with perl 5.13.3, began to add backrefs to
+ * stashes. CvSTASH_set() started to do it as well with commit c68d95645
+ * (which was part of perl 5.13.7). */
+#if SU_HAS_PERL(5, 13, 3) && !SU_HAS_PERL(5, 13, 7)
+ if (CvSTASH(proto))
+ Perl_sv_add_backref(aTHX_ CvSTASH(proto), MUTABLE_SV(cv));
+#endif
+
+ OP_REFCNT_LOCK;
+ CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
+ OP_REFCNT_UNLOCK;
+ CvSTART(cv) = CvSTART(proto);
+ CvOUTSIDE(cv) = CvOUTSIDE(proto);
+#ifdef CVf_WEAKOUTSIDE
+ if (!(CvFLAGS(proto) & CVf_WEAKOUTSIDE))
+#endif
+ SvREFCNT_inc_simple_void(CvOUTSIDE(cv));
+#ifdef CvOUTSIDE_SEQ
+ CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
+#endif
+
+ if (SvPOK(proto))
+ sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto));
+
+ padlist = newAV();
+ AvREAL_off(padlist);
+ av_fill(padlist, fpadlist);
+ CvPADLIST(cv) = padlist;
+
+ padname = newAV();
+ av_fill(padname, fpadname);
+ if (fpadname >= 0) {
+ I32 j;
+ SV **psvp = AvARRAY(protopadname);
+ SV **svp = AvARRAY(padname);
+
+ svp[0] = &PL_sv_undef;
+ for (j = 1; j <= fpadname; ++j)
+ svp[j] = SvREFCNT_inc(psvp[j]);
+ }
+ AvARRAY(padlist)[0] = MUTABLE_SV(padname);
+
+ if (fpadlist >= 1) {
+ I32 i;
+
+ for (i = 1; i <= fpadlist; ++i) {
+ AV *protoframe = MUTABLE_AV(AvARRAY(protopadlist)[i]);
+ AV *frame = newAV();
+ SV **psvp = AvARRAY(protoframe);
+ SV **svp;
+ I32 j, fframe = AvFILLp(protoframe);
+
+ av_fill(frame, fframe);
+ svp = AvARRAY(frame);
+ if (i == 1) {
+ AV *a0 = newAV(); /* will be @_ */
+ AvREAL_off(a0);
+ AvREIFY_on(a0);
+ svp[0] = MUTABLE_SV(a0);
+ } else {
+ svp[0] = SvREFCNT_inc(psvp[0]);
+ }
+ for (j = 1; j <= fframe; ++j)
+ svp[j] = SvREFCNT_inc(psvp[j]);
+
+ AvARRAY(padlist)[i] = MUTABLE_SV(frame);
+ }
+ }
+
+#ifdef CvCONST
+ if (CvCONST(cv))
+ CvCONST_off(cv);
+#endif
+
+ return cv;
+}
+
+STATIC I32 su_uplevel(pTHX_ CV *cv, I32 cxix, I32 args) {
+#define su_uplevel(C, I, A) su_uplevel(aTHX_ (C), (I), (A))
+ su_uplevel_ud *sud;
+ const PERL_CONTEXT *cx = cxstack + cxix;
+ PERL_SI *si;
+ PERL_SI *cur = PL_curstackinfo;
+ SV **old_stack_sp;
+ CV *target_cv;
+ UNOP sub_op;
+ I32 gimme;
+ I32 old_mark, new_mark;
+ I32 ret;
+ dSP;
+
+ ENTER;
+
+ gimme = GIMME_V;
+ /* Make PL_stack_sp point just before the CV. */
+ PL_stack_sp -= args + 1;
+ old_mark = AvFILLp(PL_curstack) = PL_stack_sp - PL_stack_base;
+ SPAGAIN;
+
+ sud = su_uplevel_storage_new();
+
+ sud->cxix = cxix;
+ sud->died = 1;
+ sud->callback = cv;
+ SAVEDESTRUCTOR_X(su_uplevel_restore, sud);
+
+ si = sud->si;
+
+ si->si_type = cur->si_type;
+ si->si_next = NULL;
+ si->si_prev = cur->si_prev;
+#ifdef DEBUGGING
+ si->si_markoff = cx->blk_oldmarksp;
+#endif
+
+ /* Allocate enough space for all the elements of the original stack up to the
+ * target context, plus the forthcoming arguments. */
+ new_mark = cx->blk_oldsp;
+ av_extend(si->si_stack, new_mark + 1 + args + 1);
+ Copy(PL_curstack, AvARRAY(si->si_stack), new_mark + 1, SV *);
+ AvFILLp(si->si_stack) = new_mark;
+ SU_POISON(AvARRAY(si->si_stack) + new_mark + 1, args + 1, SV *);
+
+ /* Specialized SWITCHSTACK() */
+ PL_stack_base = AvARRAY(si->si_stack);
+ old_stack_sp = PL_stack_sp;
+ PL_stack_sp = PL_stack_base + AvFILLp(si->si_stack);
+ PL_stack_max = PL_stack_base + AvMAX(si->si_stack);
+ SPAGAIN;
+
+ /* Copy the context stack up to the context just below the target. */
+ si->si_cxix = (cxix < 0) ? -1 : (cxix - 1);
+ if (si->si_cxmax < cxix) {
+ /* The max size must be at least two so that GROW(max) = (max*3)/2 > max */
+ si->si_cxmax = (cxix < 4) ? 4 : cxix;
+ Renew(si->si_cxstack, si->si_cxmax + 1, PERL_CONTEXT);
+ }
+ Copy(cur->si_cxstack, si->si_cxstack, cxix, PERL_CONTEXT);
+ SU_POISON(si->si_cxstack + cxix, si->si_cxmax + 1 - cxix, PERL_CONTEXT);
+
+ target_cv = cx->blk_sub.cv;
+ sud->target = (CV *) SvREFCNT_inc(target_cv);
+ sud->old_depth = CvDEPTH(target_cv);
+
+ /* blk_oldcop is essentially needed for caller() and stack traces. It has no
+ * run-time implication, since PL_curcop will be overwritten as soon as we
+ * enter a sub (a sub starts by a nextstate/dbstate). Hence it's safe to just
+ * make it point to the blk_oldcop for the target frame, so that caller()
+ * reports the right file name, line number and lexical hints. */
+ SU_UPLEVEL_SAVE(curcop, cx->blk_oldcop);
+ /* Don't reset PL_markstack_ptr, or we would overwrite the mark stack below
+ * this point. Don't reset PL_curpm either, we want the most recent matches. */
+
+ SU_UPLEVEL_SAVE(curstackinfo, si);
+ /* If those two are equal, we need to fool POPSTACK_TO() */
+ if (PL_mainstack == PL_curstack)
+ SU_UPLEVEL_SAVE(mainstack, si->si_stack);
+ else
+ sud->old_mainstack = NULL;
+ PL_curstack = si->si_stack;
+
+ PUSHMARK(SP);
+ /* Both SP and old_stack_sp point just before the CV. */
+ Copy(old_stack_sp + 2, SP + 1, args, SV *);
+ SP += args;
+ PUSHs((SV *) cv);
+ PUTBACK;
+
+ Zero(&sub_op, 1, UNOP);
+ sub_op.op_type = OP_ENTERSUB;
+ sub_op.op_next = NULL;
+ sub_op.op_flags = OP_GIMME_REVERSE(gimme) | OPf_STACKED;
+ if (PL_DBsub)
+ sub_op.op_flags |= OPpENTERSUB_DB;
+
+ SU_UPLEVEL_SAVE(op, (OP *) &sub_op);
+
+ sud->old_catch = CATCH_GET;
+ CATCH_SET(TRUE);
+
+ if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX))) {
+ PERL_CONTEXT *sub_cx;
+ CV *renamed_cv;
+
+ renamed_cv = su_cv_clone(cv, CvGV(target_cv));
+
+ sub_cx = cxstack + cxstack_ix;
+ sub_cx->blk_sub.cv = renamed_cv;
+ if (!sub_cx->blk_sub.olddepth) {
+ SvREFCNT_inc_simple_void(renamed_cv);
+ SvREFCNT_inc_simple_void(renamed_cv);
+ SAVEFREESV(renamed_cv);
+ }
+
+ if (CxHASARGS(cx) && cx->blk_sub.argarray) {
+ /* The call to pp_entersub() has saved the current @_ (in XS terms,
+ * GvAV(PL_defgv)) in the savearray member, and has created a new argarray
+ * with what we put on the stack. But we want to fake up the same arguments
+ * as the ones in use at the context we uplevel to, so we replace the
+ * argarray with an unreal copy of the original @_. */
+ AV *av = newAV();
+ AvREAL_off(av);
+ av_extend(av, AvMAX(cx->blk_sub.argarray));
+ AvFILLp(av) = AvFILLp(cx->blk_sub.argarray);
+ Copy(AvARRAY(cx->blk_sub.argarray), AvARRAY(av), AvFILLp(av) + 1, SV *);
+ cxstack[cxix].blk_sub.argarray = av;
+ } else {
+ SvREFCNT_inc_simple_void(cxstack[cxix].blk_sub.argarray);
+ }
+
+ CALLRUNOPS(aTHX);
+
+ ret = PL_stack_sp - (PL_stack_base + new_mark);
+ }
+
+ sud->died = 0;
+
+ SPAGAIN;
+
+ if (ret > 0) {
+ AV *old_stack = sud->old_curstackinfo->si_stack;
+
+ if (old_mark + ret > AvMAX(old_stack)) {
+ /* Specialized EXTEND(old_sp, ret) */
+ av_extend(old_stack, old_mark + ret + 1);
+ old_stack_sp = AvARRAY(old_stack) + old_mark;
+ }
+
+ Copy(PL_stack_sp - ret + 1, old_stack_sp + 1, ret, SV *);
+ PL_stack_sp += ret;
+ AvFILLp(old_stack) += ret;
+ }
+
+ PUTBACK;
+
+ LEAVE;
+
+ return ret;
+}
+
+/* --- Interpreter setup/teardown ------------------------------------------ */
+
+STATIC void su_teardown(pTHX_ void *param) {
+ su_uplevel_ud *cur;
+ dMY_CXT;
+
+ cur = MY_CXT.uplevel_storage.root;
+ if (cur) {
+ su_uplevel_ud *prev;
+ do {
+ prev = cur;
+ cur = prev->next;
+ su_uplevel_ud_delete(prev);
+ } while (cur);
+ }
+
+ return;
+}
+
+STATIC void su_setup(pTHX) {
+#define su_setup() su_setup(aTHX)
+ MY_CXT_INIT;
+
+ MY_CXT.stack_placeholder = NULL;
+
+ /* NewOp() calls calloc() which just zeroes the memory with memset(). */
+ Zero(&(MY_CXT.unwind_storage.return_op), 1, LISTOP);
+ MY_CXT.unwind_storage.return_op.op_type = OP_RETURN;
+ MY_CXT.unwind_storage.return_op.op_ppaddr = PL_ppaddr[OP_RETURN];
+
+ Zero(&(MY_CXT.unwind_storage.proxy_op), 1, OP);
+ MY_CXT.unwind_storage.proxy_op.op_type = OP_STUB;
+ MY_CXT.unwind_storage.proxy_op.op_ppaddr = NULL;
+
+ MY_CXT.uplevel_storage.root = NULL;
+ MY_CXT.uplevel_storage.count = 0;
+
+ call_atexit(su_teardown, NULL);
+
+ return;
}
/* --- XS ------------------------------------------------------------------ */
continue;
case CXt_EVAL:
case CXt_FORMAT:
- MY_CXT.cxix = cxix;
- MY_CXT.items = items;
+ MY_CXT.unwind_storage.cxix = cxix;
+ MY_CXT.unwind_storage.items = items;
/* pp_entersub will want to sanitize the stack after returning from there
* Screw that, we're insane */
if (GIMME_V == G_SCALAR) {
- MY_CXT.savesp = PL_stack_sp;
+ MY_CXT.unwind_storage.savesp = PL_stack_sp;
/* dXSARGS calls POPMARK, so we need to match PL_markstack_ptr[1] */
PL_stack_sp = PL_stack_base + PL_markstack_ptr[1] + 1;
} else {
- MY_CXT.savesp = NULL;
+ MY_CXT.unwind_storage.savesp = NULL;
}
SAVEDESTRUCTOR_X(su_unwind, NULL);
return;
{
HV *stash;
- MY_CXT_INIT;
- MY_CXT.stack_placeholder = 0;
-
stash = gv_stashpv(__PACKAGE__, 1);
newCONSTSUB(stash, "TOP", newSViv(0));
newCONSTSUB(stash, "SU_THREADSAFE", newSVuv(SU_THREADSAFE));
newXSproto("Scope::Upper::unwind", XS_Scope__Upper_unwind, file, NULL);
+
+ su_setup();
}
#if SU_THREADSAFE
void
CLONE(...)
PROTOTYPE: DISABLE
-CODE:
- PERL_UNUSED_VAR(items);
+PPCODE:
{
MY_CXT_CLONE;
+ MY_CXT.uplevel_storage.root = NULL;
+ MY_CXT.uplevel_storage.count = 0;
}
+ XSRETURN(0);
#endif /* SU_THREADSAFE */
-SV *
+void
HERE()
PROTOTYPE:
PREINIT:
I32 cxix = cxstack_ix;
-CODE:
+PPCODE:
if (PL_DBsub)
SU_SKIP_DB(cxix);
- RETVAL = newSViv(cxix);
-OUTPUT:
- RETVAL
+ EXTEND(SP, 1);
+ mPUSHi(cxix);
+ XSRETURN(1);
-SV *
+void
UP(...)
PROTOTYPE: ;$
PREINIT:
I32 cxix;
-CODE:
+PPCODE:
SU_GET_CONTEXT(0, 0);
if (--cxix < 0)
cxix = 0;
if (PL_DBsub)
SU_SKIP_DB(cxix);
- RETVAL = newSViv(cxix);
-OUTPUT:
- RETVAL
+ EXTEND(SP, 1);
+ mPUSHi(cxix);
+ XSRETURN(1);
void
SUB(...)
I32 cxix;
PPCODE:
SU_GET_CONTEXT(0, 0);
+ EXTEND(SP, 1);
for (; cxix >= 0; --cxix) {
PERL_CONTEXT *cx = cxstack + cxix;
switch (CxTYPE(cx)) {
case CXt_SUB:
if (PL_DBsub && cx->blk_sub.cv == GvCV(PL_DBsub))
continue;
- ST(0) = sv_2mortal(newSViv(cxix));
+ mPUSHi(cxix);
XSRETURN(1);
}
}
I32 cxix;
PPCODE:
SU_GET_CONTEXT(0, 0);
+ EXTEND(SP, 1);
for (; cxix >= 0; --cxix) {
PERL_CONTEXT *cx = cxstack + cxix;
switch (CxTYPE(cx)) {
default:
continue;
case CXt_EVAL:
- ST(0) = sv_2mortal(newSViv(cxix));
+ mPUSHi(cxix);
XSRETURN(1);
}
}
if (cxix < 0)
cxix = 0;
}
- ST(0) = sv_2mortal(newSViv(cxix));
+ EXTEND(SP, 1);
+ mPUSHi(cxix);
XSRETURN(1);
void
}
}
done:
- ST(0) = sv_2mortal(newSViv(cxix));
+ EXTEND(SP, 1);
+ mPUSHi(cxix);
XSRETURN(1);
void
I32 cxix;
PPCODE:
SU_GET_CONTEXT(0, 0);
+ EXTEND(SP, 1);
while (cxix > 0) {
PERL_CONTEXT *cx = cxstack + cxix--;
switch (CxTYPE(cx)) {
SU_UD_ORIGIN(ud) = NULL;
SU_UD_HANDLER(ud) = su_reap;
ud->cb = newSVsv(hook);
- su_init(cxix, ud, 3);
+ su_init(ud, cxix, SU_SAVE_DESTRUCTOR_SIZE);
void
localize(SV *sv, SV *val, ...)
PROTOTYPE: $$;$
PREINIT:
I32 cxix;
- I32 size = 3;
+ I32 size;
su_ud_localize *ud;
CODE:
SU_GET_CONTEXT(2, 2);
Newx(ud, 1, su_ud_localize);
SU_UD_ORIGIN(ud) = NULL;
SU_UD_HANDLER(ud) = su_localize;
- su_ud_localize_init(ud, sv, val, NULL);
-#if !SU_HAS_PERL(5, 8, 9)
- if (ud->type >= SVt_PVGV)
- size = 6;
-#endif
- su_init(cxix, ud, size);
+ size = su_ud_localize_init(ud, sv, val, NULL);
+ su_init(ud, cxix, size);
void
localize_elem(SV *sv, SV *elem, SV *val, ...)
PROTOTYPE: $$$;$
PREINIT:
I32 cxix;
+ I32 size;
su_ud_localize *ud;
CODE:
if (SvTYPE(sv) >= SVt_PVGV)
Newx(ud, 1, su_ud_localize);
SU_UD_ORIGIN(ud) = NULL;
SU_UD_HANDLER(ud) = su_localize;
- su_ud_localize_init(ud, sv, val, elem);
+ size = su_ud_localize_init(ud, sv, val, elem);
if (ud->type != SVt_PVAV && ud->type != SVt_PVHV) {
- Safefree(ud);
+ SU_UD_LOCALIZE_FREE(ud);
croak("Can't localize an element of something that isn't an array or a hash");
}
- su_init(cxix, ud, 4);
+ su_init(ud, cxix, size);
void
localize_delete(SV *sv, SV *elem, ...)
PROTOTYPE: $$;$
PREINIT:
I32 cxix;
- I32 size = 4;
+ I32 size;
su_ud_localize *ud;
CODE:
SU_GET_CONTEXT(2, 2);
Newx(ud, 1, su_ud_localize);
SU_UD_ORIGIN(ud) = NULL;
SU_UD_HANDLER(ud) = su_localize;
- su_ud_localize_init(ud, sv, NULL, elem);
-#if !SU_HAS_PERL(5, 8, 9)
- if (ud->type >= SVt_PVGV)
- size = 6;
-#endif
- su_init(cxix, ud, size);
+ size = su_ud_localize_init(ud, sv, NULL, elem);
+ su_init(ud, cxix, size);
+
+void
+uplevel(SV *code, ...)
+PROTOTYPE: &@
+PREINIT:
+ I32 cxix, ret, args = 0;
+PPCODE:
+ if (SvROK(code))
+ code = SvRV(code);
+ if (SvTYPE(code) < SVt_PVCV)
+ croak("First argument to uplevel must be a code reference");
+ SU_GET_CONTEXT(1, items - 1);
+ do {
+ PERL_CONTEXT *cx = cxstack + cxix;
+ switch (CxTYPE(cx)) {
+ case CXt_EVAL:
+ croak("Can't uplevel to an eval frame");
+ case CXt_FORMAT:
+ croak("Can't uplevel to a format frame");
+ case CXt_SUB:
+ if (PL_DBsub && cx->blk_sub.cv == GvCV(PL_DBsub))
+ continue;
+ if (items > 1) {
+ PL_stack_sp--;
+ args = items - 2;
+ }
+ /* su_uplevel() takes care of extending the stack if needed. */
+ ret = su_uplevel((CV *) code, cxix, args);
+ XSRETURN(ret);
+ default:
+ break;
+ }
+ } while (--cxix >= 0);
+ croak("Can't uplevel outside a subroutine");