/* --- Compatibility ------------------------------------------------------- */
+#ifndef PERL_UNUSED_VAR
+# define PERL_UNUSED_VAR(V)
+#endif
+
#ifndef STMT_START
# define STMT_START do
#endif
#define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (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
+# else
+# define SU_MULTIPLICITY 0
+# endif
+#endif
+#if SU_MULTIPLICITY && !defined(tTHX)
+# define tTHX PerlInterpreter*
+#endif
+
+#if SU_MULTIPLICITY && defined(USE_ITHREADS) && defined(dMY_CXT) && defined(MY_CXT) && defined(START_MY_CXT) && defined(MY_CXT_INIT) && (defined(MY_CXT_CLONE) || defined(dMY_CXT_SV))
+# define SU_THREADSAFE 1
+# ifndef MY_CXT_CLONE
+# define MY_CXT_CLONE \
+ dMY_CXT_SV; \
+ my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
+ Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
+ sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
+# endif
+#else
+# define SU_THREADSAFE 0
+# undef dMY_CXT
+# define dMY_CXT dNOOP
+# undef MY_CXT
+# define MY_CXT su_globaldata
+# undef START_MY_CXT
+# define START_MY_CXT STATIC my_cxt_t MY_CXT;
+# undef MY_CXT_INIT
+# define MY_CXT_INIT NOOP
+# undef MY_CXT_CLONE
+# define MY_CXT_CLONE NOOP
+#endif
+
/* --- Stack manipulations ------------------------------------------------- */
#ifndef SvCANEXISTDELETE
} su_ud_adelete;
STATIC void su_adelete(pTHX_ void *ud_) {
- su_ud_adelete *ud = ud_;
+ su_ud_adelete *ud = (su_ud_adelete *) ud_;
av_delete(ud->av, ud->idx, G_DISCARD);
SvREFCNT_dec(ud->av);
return depth;
}
-#define SU_GET_LEVEL(A) \
- if (items > A) { \
- SV *lsv = ST(A); \
- if (SvOK(lsv)) \
- level = SvUV(lsv); \
- if (level < 0) \
- XSRETURN(0); \
- } \
- if (level > cxstack_ix) \
- level = cxstack_ix;
+/* --- Global data --------------------------------------------------------- */
+
+#define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
+
+typedef struct {
+ I32 cxix;
+ I32 items;
+ SV **savesp;
+ OP fakeop;
+} my_cxt_t;
+
+START_MY_CXT
+
+/* --- Unwind stack -------------------------------------------------------- */
+
+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 mark;
+
+ if (savesp)
+ PL_stack_sp = savesp;
+
+ if (cxstack_ix > cxix)
+ dounwind(cxix);
+
+ /* Hide the level */
+ if (items >= 0)
+ PL_stack_sp--;
+
+ mark = PL_markstack[cxstack[cxix].blk_oldmarksp];
+ *PL_markstack_ptr = PL_stack_sp - PL_stack_base - items;
+
+ SU_D({
+ I32 gimme = GIMME_V;
+ PerlIO_printf(Perl_debug_log,
+ "%p: cx=%d gimme=%s items=%d sp=%d oldmark=%d mark=%d\n",
+ &MY_CXT, cxix,
+ gimme == G_VOID ? "void" : gimme == G_ARRAY ? "list" : "scalar",
+ items, PL_stack_sp - PL_stack_base, *PL_markstack_ptr, mark);
+ });
+
+ PL_op = PL_ppaddr[OP_RETURN](aTHX);
+ *PL_markstack_ptr = mark;
+
+ MY_CXT.fakeop.op_next = PL_op;
+ PL_op = &(MY_CXT.fakeop);
+}
+
+/* --- XS ------------------------------------------------------------------ */
+
+#define SU_GET_LEVEL(A) \
+ STMT_START { \
+ if (items > A) { \
+ SV *lsv = ST(A); \
+ if (SvOK(lsv)) \
+ level = SvIV(lsv); \
+ if (level < 0) \
+ XSRETURN(0); \
+ } \
+ if (level > cxstack_ix) \
+ level = cxstack_ix; \
+ } STMT_END
+
+#define SU_GET_CONTEXT(A, B) \
+ STMT_START { \
+ if (items > A) { \
+ SV *lsv = ST(B); \
+ if (SvOK(lsv)) \
+ level = SvIV(lsv); \
+ if (level < 0) \
+ level = 0; \
+ else if (level > cxix) \
+ level = cxix; \
+ } \
+ } STMT_END
#define SU_DOPOPTOCX(t) \
STMT_START { \
- I32 i, cxix = cxstack_ix, from = 0; \
- if (items) \
- from = SvIV(ST(0)); \
- for (i = cxix - from; i >= 0; --i) { \
+ I32 i, cxix = cxstack_ix, level = 0; \
+ SU_GET_CONTEXT(0, 0); \
+ for (i = cxix - level; i >= 0; --i) { \
if (CxTYPE(&cxstack[i]) == t) { \
ST(0) = sv_2mortal(newSViv(cxix - i)); \
XSRETURN(1); \
XSRETURN_UNDEF; \
} STMT_END
-/* --- XS ------------------------------------------------------------------ */
+XS(XS_Scope__Upper_unwind); /* prototype to pass -Wmissing-prototypes */
+
+XS(XS_Scope__Upper_unwind) {
+#ifdef dVAR
+ dVAR; dXSARGS;
+#else
+ dXSARGS;
+#endif
+ dMY_CXT;
+ I32 cxix = cxstack_ix, level = 0;
+
+ PERL_UNUSED_VAR(cv); /* -W */
+ PERL_UNUSED_VAR(ax); /* -Wall */
+
+ SU_GET_CONTEXT(0, items - 1);
+ cxix -= level;
+ do {
+ PERL_CONTEXT *cx = cxstack + cxix;
+ switch (CxTYPE(cx)) {
+ case CXt_SUB:
+ case CXt_EVAL:
+ case CXt_FORMAT:
+ MY_CXT.cxix = cxix;
+ MY_CXT.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;
+ /* 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;
+ }
+ SAVEDESTRUCTOR_X(su_unwind, NULL);
+ return;
+ default:
+ break;
+ }
+ } while (--cxix >= 0);
+ croak("Can't return outside a subroutine");
+}
MODULE = Scope::Upper PACKAGE = Scope::Upper
BOOT:
{
- HV *stash = gv_stashpv(__PACKAGE__, 1);
+ HV *stash;
+ MY_CXT_INIT;
+ stash = gv_stashpv(__PACKAGE__, 1);
newCONSTSUB(stash, "HERE", newSViv(0));
+ newXSproto("Scope::Upper::unwind", XS_Scope__Upper_unwind, file, NULL);
}
+void
+CLONE(...)
+PROTOTYPE: DISABLE
+CODE:
+#if SU_THREADSAFE
+ MY_CXT_CLONE;
+#endif /* SU_THREADSAFE */
+
SV *
TOP()
PROTOTYPE:
PPCODE:
SU_DOPOPTOCX(CXt_EVAL);
+void
+CALLER(...)
+PROTOTYPE: ;$
+PREINIT:
+ I32 cxix = cxstack_ix, caller = 0, level = 0;
+PPCODE:
+ if (items) {
+ SV *csv = ST(0);
+ if (SvOK(csv))
+ caller = SvIV(csv);
+ }
+ cxix = cxstack_ix;
+ while (cxix > 0) {
+ PERL_CONTEXT *cx = cxstack + cxix--;
+ switch (CxTYPE(cx)) {
+ case CXt_SUB:
+ case CXt_EVAL:
+ case CXt_FORMAT:
+ --caller;
+ if (caller < 0)
+ goto done;
+ break;
+ }
+ ++level;
+ }
+done:
+ ST(0) = sv_2mortal(newSViv(level));
+ XSRETURN(1);
+
+void
+want_at(...)
+PROTOTYPE: ;$
+PREINIT:
+ I32 cxix = cxstack_ix, level = 0;
+PPCODE:
+ SU_GET_CONTEXT(0, 0);
+ cxix -= level;
+ while (cxix > 0) {
+ PERL_CONTEXT *cx = cxstack + cxix--;
+ switch (CxTYPE(cx)) {
+ case CXt_SUB:
+ case CXt_EVAL:
+ case CXt_FORMAT: {
+ I32 gimme = cx->blk_gimme;
+ switch (gimme) {
+ case G_VOID: XSRETURN_UNDEF; break;
+ case G_SCALAR: XSRETURN_NO; break;
+ case G_ARRAY: XSRETURN_YES; break;
+ }
+ break;
+ }
+ }
+ }
+ XSRETURN_UNDEF;
+
void
reap(SV *hook, ...)
PROTOTYPE: &;$
projects / perl / modules / Scope-Upper.git / blobdiff