3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
4 * 2000, 2001, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
11 #ifdef USE_5005THREADS
13 #define dARGS struct perl_thread *thr;
17 #endif /* USE_5005THREADS */
19 #define PP(s) OP * Perl_##s(pTHX)
22 =head1 Stack Manipulation Macros
25 Stack pointer. This is usually handled by C<xsubpp>. See C<dSP> and
29 Stack marker variable for the XSUB. See C<dMARK>.
31 =for apidoc Ams||PUSHMARK
32 Opening bracket for arguments on a callback. See C<PUTBACK> and
36 Declares a local copy of perl's stack pointer for the XSUB, available via
37 the C<SP> macro. See C<SP>.
41 Declare Just C<SP>. This is actually identical to C<dSP>, and declares
42 a local copy of perl's stack pointer, available via the C<SP> macro.
43 See C<SP>. (Available for backward source code compatibility with the
44 old (Perl 5.005) thread model.)
46 =for apidoc Ams||dMARK
47 Declare a stack marker variable, C<mark>, for the XSUB. See C<MARK> and
50 =for apidoc Ams||dORIGMARK
51 Saves the original stack mark for the XSUB. See C<ORIGMARK>.
53 =for apidoc AmU||ORIGMARK
54 The original stack mark for the XSUB. See C<dORIGMARK>.
56 =for apidoc Ams||SPAGAIN
57 Refetch the stack pointer. Used after a callback. See L<perlcall>.
61 #undef SP /* Solaris 2.7 i386 has this in /usr/include/sys/reg.h */
66 #define PUSHMARK(p) if (++PL_markstack_ptr == PL_markstack_max) \
68 *PL_markstack_ptr = (p) - PL_stack_base
70 #define TOPMARK (*PL_markstack_ptr)
71 #define POPMARK (*PL_markstack_ptr--)
73 #define dSP register SV **sp = PL_stack_sp
75 #define dMARK register SV **mark = PL_stack_base + POPMARK
76 #define dORIGMARK I32 origmark = mark - PL_stack_base
77 #define SETORIGMARK origmark = mark - PL_stack_base
78 #define ORIGMARK (PL_stack_base + origmark)
80 #define SPAGAIN sp = PL_stack_sp
81 #define MSPAGAIN sp = PL_stack_sp; mark = ORIGMARK
83 #define GETTARGETSTACKED targ = (PL_op->op_flags & OPf_STACKED ? POPs : PAD_SV(PL_op->op_targ))
84 #define dTARGETSTACKED SV * GETTARGETSTACKED
86 #define GETTARGET targ = PAD_SV(PL_op->op_targ)
87 #define dTARGET SV * GETTARGET
89 #define GETATARGET targ = (PL_op->op_flags & OPf_STACKED ? sp[-1] : PAD_SV(PL_op->op_targ))
90 #define dATARGET SV * GETATARGET
92 #define dTARG SV *targ
94 #define NORMAL PL_op->op_next
95 #define DIE return Perl_die
98 =for apidoc Ams||PUTBACK
99 Closing bracket for XSUB arguments. This is usually handled by C<xsubpp>.
100 See C<PUSHMARK> and L<perlcall> for other uses.
102 =for apidoc Amn|SV*|POPs
103 Pops an SV off the stack.
105 =for apidoc Amn|char*|POPp
106 Pops a string off the stack. Deprecated. New code should provide
107 a STRLEN n_a and use POPpx.
109 =for apidoc Amn|char*|POPpx
110 Pops a string off the stack.
111 Requires a variable STRLEN n_a in scope.
113 =for apidoc Amn|char*|POPpbytex
114 Pops a string off the stack which must consist of bytes i.e. characters < 256.
115 Requires a variable STRLEN n_a in scope.
117 =for apidoc Amn|NV|POPn
118 Pops a double off the stack.
120 =for apidoc Amn|IV|POPi
121 Pops an integer off the stack.
123 =for apidoc Amn|long|POPl
124 Pops a long off the stack.
129 #define PUTBACK PL_stack_sp = sp
130 #define RETURN return PUTBACK, NORMAL
131 #define RETURNOP(o) return PUTBACK, o
132 #define RETURNX(x) return x, PUTBACK, NORMAL
135 #define POPp (SvPVx(POPs, PL_na)) /* deprecated */
136 #define POPpx (SvPVx(POPs, n_a))
137 #define POPpbytex (SvPVbytex(POPs, n_a))
138 #define POPn (SvNVx(POPs))
139 #define POPi ((IV)SvIVx(POPs))
140 #define POPu ((UV)SvUVx(POPs))
141 #define POPl ((long)SvIVx(POPs))
142 #define POPul ((unsigned long)SvIVx(POPs))
144 #define POPq ((Quad_t)SvIVx(POPs))
145 #define POPuq ((Uquad_t)SvUVx(POPs))
149 #define TOPm1s (*(sp-1))
150 #define TOPp1s (*(sp+1))
151 #define TOPp (SvPV(TOPs, PL_na)) /* deprecated */
152 #define TOPpx (SvPV(TOPs, n_a))
153 #define TOPn (SvNV(TOPs))
154 #define TOPi ((IV)SvIV(TOPs))
155 #define TOPu ((UV)SvUV(TOPs))
156 #define TOPl ((long)SvIV(TOPs))
157 #define TOPul ((unsigned long)SvUV(TOPs))
159 #define TOPq ((Quad_t)SvIV(TOPs))
160 #define TOPuq ((Uquad_t)SvUV(TOPs))
163 /* Go to some pains in the rare event that we must extend the stack. */
166 =for apidoc Am|void|EXTEND|SP|int nitems
167 Used to extend the argument stack for an XSUB's return values. Once
168 used, guarantees that there is room for at least C<nitems> to be pushed
171 =for apidoc Am|void|PUSHs|SV* sv
172 Push an SV onto the stack. The stack must have room for this element.
173 Does not handle 'set' magic. See C<XPUSHs>.
175 =for apidoc Am|void|PUSHp|char* str|STRLEN len
176 Push a string onto the stack. The stack must have room for this element.
177 The C<len> indicates the length of the string. Handles 'set' magic. See
180 =for apidoc Am|void|PUSHn|NV nv
181 Push a double onto the stack. The stack must have room for this element.
182 Handles 'set' magic. See C<XPUSHn>.
184 =for apidoc Am|void|PUSHi|IV iv
185 Push an integer onto the stack. The stack must have room for this element.
186 Handles 'set' magic. See C<XPUSHi>.
188 =for apidoc Am|void|PUSHu|UV uv
189 Push an unsigned integer onto the stack. The stack must have room for this
190 element. See C<XPUSHu>.
192 =for apidoc Am|void|XPUSHs|SV* sv
193 Push an SV onto the stack, extending the stack if necessary. Does not
194 handle 'set' magic. See C<PUSHs>.
196 =for apidoc Am|void|XPUSHp|char* str|STRLEN len
197 Push a string onto the stack, extending the stack if necessary. The C<len>
198 indicates the length of the string. Handles 'set' magic. See
201 =for apidoc Am|void|XPUSHn|NV nv
202 Push a double onto the stack, extending the stack if necessary. Handles
203 'set' magic. See C<PUSHn>.
205 =for apidoc Am|void|XPUSHi|IV iv
206 Push an integer onto the stack, extending the stack if necessary. Handles
207 'set' magic. See C<PUSHi>.
209 =for apidoc Am|void|XPUSHu|UV uv
210 Push an unsigned integer onto the stack, extending the stack if necessary.
216 #define EXTEND(p,n) STMT_START { if (PL_stack_max - p < (int)(n)) { \
217 sp = stack_grow(sp,p, (int) (n)); \
220 /* Same thing, but update mark register too. */
221 #define MEXTEND(p,n) STMT_START {if (PL_stack_max - p < (int)(n)) { \
222 int markoff = mark - PL_stack_base; \
223 sp = stack_grow(sp,p,(int) (n)); \
224 mark = PL_stack_base + markoff; \
227 #define PUSHs(s) (*++sp = (s))
228 #define PUSHTARG STMT_START { SvSETMAGIC(TARG); PUSHs(TARG); } STMT_END
229 #define PUSHp(p,l) STMT_START { sv_setpvn(TARG, (p), (l)); PUSHTARG; } STMT_END
230 #define PUSHn(n) STMT_START { sv_setnv(TARG, (NV)(n)); PUSHTARG; } STMT_END
231 #define PUSHi(i) STMT_START { sv_setiv(TARG, (IV)(i)); PUSHTARG; } STMT_END
232 #define PUSHu(u) STMT_START { sv_setuv(TARG, (UV)(u)); PUSHTARG; } STMT_END
234 #define XPUSHs(s) STMT_START { EXTEND(sp,1); (*++sp = (s)); } STMT_END
235 #define XPUSHTARG STMT_START { SvSETMAGIC(TARG); XPUSHs(TARG); } STMT_END
236 #define XPUSHp(p,l) STMT_START { sv_setpvn(TARG, (p), (l)); XPUSHTARG; } STMT_END
237 #define XPUSHn(n) STMT_START { sv_setnv(TARG, (NV)(n)); XPUSHTARG; } STMT_END
238 #define XPUSHi(i) STMT_START { sv_setiv(TARG, (IV)(i)); XPUSHTARG; } STMT_END
239 #define XPUSHu(u) STMT_START { sv_setuv(TARG, (UV)(u)); XPUSHTARG; } STMT_END
240 #define XPUSHundef STMT_START { SvOK_off(TARG); XPUSHs(TARG); } STMT_END
242 #define SETs(s) (*sp = s)
243 #define SETTARG STMT_START { SvSETMAGIC(TARG); SETs(TARG); } STMT_END
244 #define SETp(p,l) STMT_START { sv_setpvn(TARG, (p), (l)); SETTARG; } STMT_END
245 #define SETn(n) STMT_START { sv_setnv(TARG, (NV)(n)); SETTARG; } STMT_END
246 #define SETi(i) STMT_START { sv_setiv(TARG, (IV)(i)); SETTARG; } STMT_END
247 #define SETu(u) STMT_START { sv_setuv(TARG, (UV)(u)); SETTARG; } STMT_END
249 #define dTOPss SV *sv = TOPs
250 #define dPOPss SV *sv = POPs
251 #define dTOPnv NV value = TOPn
252 #define dPOPnv NV value = POPn
253 #define dTOPiv IV value = TOPi
254 #define dPOPiv IV value = POPi
255 #define dTOPuv UV value = TOPu
256 #define dPOPuv UV value = POPu
258 #define dTOPqv Quad_t value = TOPu
259 #define dPOPqv Quad_t value = POPu
260 #define dTOPuqv Uquad_t value = TOPuq
261 #define dPOPuqv Uquad_t value = POPuq
264 #define dPOPXssrl(X) SV *right = POPs; SV *left = CAT2(X,s)
265 #define dPOPXnnrl(X) NV right = POPn; NV left = CAT2(X,n)
266 #define dPOPXiirl(X) IV right = POPi; IV left = CAT2(X,i)
268 #define USE_LEFT(sv) \
269 (SvOK(sv) || SvGMAGICAL(sv) || !(PL_op->op_flags & OPf_STACKED))
270 #define dPOPXnnrl_ul(X) \
272 SV *leftsv = CAT2(X,s); \
273 NV left = USE_LEFT(leftsv) ? SvNV(leftsv) : 0.0
274 #define dPOPXiirl_ul(X) \
276 SV *leftsv = CAT2(X,s); \
277 IV left = USE_LEFT(leftsv) ? SvIV(leftsv) : 0
279 #define dPOPPOPssrl dPOPXssrl(POP)
280 #define dPOPPOPnnrl dPOPXnnrl(POP)
281 #define dPOPPOPnnrl_ul dPOPXnnrl_ul(POP)
282 #define dPOPPOPiirl dPOPXiirl(POP)
283 #define dPOPPOPiirl_ul dPOPXiirl_ul(POP)
285 #define dPOPTOPssrl dPOPXssrl(TOP)
286 #define dPOPTOPnnrl dPOPXnnrl(TOP)
287 #define dPOPTOPnnrl_ul dPOPXnnrl_ul(TOP)
288 #define dPOPTOPiirl dPOPXiirl(TOP)
289 #define dPOPTOPiirl_ul dPOPXiirl_ul(TOP)
291 #define RETPUSHYES RETURNX(PUSHs(&PL_sv_yes))
292 #define RETPUSHNO RETURNX(PUSHs(&PL_sv_no))
293 #define RETPUSHUNDEF RETURNX(PUSHs(&PL_sv_undef))
295 #define RETSETYES RETURNX(SETs(&PL_sv_yes))
296 #define RETSETNO RETURNX(SETs(&PL_sv_no))
297 #define RETSETUNDEF RETURNX(SETs(&PL_sv_undef))
299 #define ARGTARG PL_op->op_targ
301 /* See OPpTARGET_MY: */
302 #define MAXARG (PL_op->op_private & 15)
304 #define SWITCHSTACK(f,t) \
306 AvFILLp(f) = sp - PL_stack_base; \
307 PL_stack_base = AvARRAY(t); \
308 PL_stack_max = PL_stack_base + AvMAX(t); \
309 sp = PL_stack_sp = PL_stack_base + AvFILLp(t); \
313 #define EXTEND_MORTAL(n) \
315 if (PL_tmps_ix + (n) >= PL_tmps_max) \
319 #define AMGf_noright 1
320 #define AMGf_noleft 2
321 #define AMGf_assign 4
324 #define tryAMAGICbinW(meth,assign,set) STMT_START { \
325 if (PL_amagic_generation) { \
327 SV* right= *(sp); SV* left= *(sp-1);\
328 if ((SvAMAGIC(left)||SvAMAGIC(right))&&\
329 (tmpsv=amagic_call(left, \
332 (assign)? AMGf_assign: 0))) {\
334 (void)POPs; set(tmpsv); RETURN; } \
338 #define tryAMAGICbin(meth,assign) tryAMAGICbinW(meth,assign,SETsv)
339 #define tryAMAGICbinSET(meth,assign) tryAMAGICbinW(meth,assign,SETs)
341 #define AMG_CALLun(sv,meth) amagic_call(sv,&PL_sv_undef, \
342 CAT2(meth,_amg),AMGf_noright | AMGf_unary)
343 #define AMG_CALLbinL(left,right,meth) \
344 amagic_call(left,right,CAT2(meth,_amg),AMGf_noright)
346 #define tryAMAGICunW(meth,set,shift,ret) STMT_START { \
347 if (PL_amagic_generation) { \
349 SV* arg= sp[shift]; \
350 if(0) goto am_again; /* shut up unused warning */ \
352 if ((SvAMAGIC(arg))&&\
353 (tmpsv=AMG_CALLun(arg,meth))) {\
354 SPAGAIN; if (shift) sp += shift; \
359 #define FORCE_SETs(sv) STMT_START { sv_setsv(TARG, (sv)); SETTARG; } STMT_END
361 #define tryAMAGICun(meth) tryAMAGICunW(meth,SETsvUN,0,RETURN)
362 #define tryAMAGICunSET(meth) tryAMAGICunW(meth,SETs,0,RETURN)
363 #define tryAMAGICunTARGET(meth, shift) \
364 { dSP; sp--; /* get TARGET from below PL_stack_sp */ \
366 { dSP; tryAMAGICunW(meth,FORCE_SETs,shift,RETURN);}}}
368 #define setAGAIN(ref) sv = ref; \
370 Perl_croak(aTHX_ "Overloaded dereference did not return a reference"); \
371 if (ref != arg && SvRV(ref) != SvRV(arg)) { \
376 #define tryAMAGICunDEREF(meth) tryAMAGICunW(meth,setAGAIN,0,(void)0)
378 #define opASSIGN (PL_op->op_flags & OPf_STACKED)
379 #define SETsv(sv) STMT_START { \
380 if (opASSIGN || (SvFLAGS(TARG) & SVs_PADMY)) \
381 { sv_setsv(TARG, (sv)); SETTARG; } \
382 else SETs(sv); } STMT_END
384 #define SETsvUN(sv) STMT_START { \
385 if (SvFLAGS(TARG) & SVs_PADMY) \
386 { sv_setsv(TARG, (sv)); SETTARG; } \
387 else SETs(sv); } STMT_END
389 /* newSVsv does not behave as advertised, so we copy missing
390 * information by hand */
392 /* SV* ref causes confusion with the member variable
393 changed SV* ref to SV* tmpRef */
394 #define RvDEEPCP(rv) STMT_START { SV* tmpRef=SvRV(rv); \
395 if (SvREFCNT(tmpRef)>1) { \
396 SvREFCNT_dec(tmpRef); \
397 SvRV(rv)=AMG_CALLun(rv,copy); \
401 =for apidoc mU||LVRET
402 True if this op will be the return value of an lvalue subroutine
405 #define LVRET ((PL_op->op_private & OPpMAYBE_LVSUB) && is_lvalue_sub())