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[perl5.git] / scope.h
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1/* scope.h
2 *
3 * Copyright (C) 1993, 1994, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2004, 2005, 2006, 2007 by Larry Wall and others
5 *
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.
8 *
9 */
10
11#define SAVEt_ITEM 0
12#define SAVEt_SV 1
13#define SAVEt_AV 2
14#define SAVEt_HV 3
15#define SAVEt_INT 4
16#define SAVEt_LONG 5
17#define SAVEt_I32 6
18#define SAVEt_IV 7
19#define SAVEt_SPTR 8
20#define SAVEt_APTR 9
21#define SAVEt_HPTR 10
22#define SAVEt_PPTR 11
23#define SAVEt_NSTAB 12
24#define SAVEt_SVREF 13
25#define SAVEt_GP 14
26#define SAVEt_FREESV 15
27#define SAVEt_FREEOP 16
28#define SAVEt_FREEPV 17
29#define SAVEt_CLEARSV 18
30#define SAVEt_DELETE 19
31#define SAVEt_DESTRUCTOR 20
32#define SAVEt_REGCONTEXT 21
33#define SAVEt_STACK_POS 22
34#define SAVEt_I16 23
35#define SAVEt_AELEM 24
36#define SAVEt_HELEM 25
37#define SAVEt_OP 26
38#define SAVEt_HINTS 27
39#define SAVEt_ALLOC 28
40#define SAVEt_GENERIC_SVREF 29
41#define SAVEt_DESTRUCTOR_X 30
42#define SAVEt_VPTR 31
43#define SAVEt_I8 32
44#define SAVEt_COMPPAD 33
45#define SAVEt_GENERIC_PVREF 34
46#define SAVEt_PADSV 35
47#define SAVEt_MORTALIZESV 36
48#define SAVEt_SHARED_PVREF 37
49#define SAVEt_BOOL 38
50#define SAVEt_SET_SVFLAGS 39
51#define SAVEt_SAVESWITCHSTACK 40
52#define SAVEt_COP_ARYBASE 41
53#define SAVEt_RE_STATE 42
54#define SAVEt_COMPILE_WARNINGS 43
55#define SAVEt_STACK_CXPOS 44
56#define SAVEt_PARSER 45
57
58#ifndef SCOPE_SAVES_SIGNAL_MASK
59#define SCOPE_SAVES_SIGNAL_MASK 0
60#endif
61
62#define SSCHECK(need) if (PL_savestack_ix + (I32)(need) > PL_savestack_max) savestack_grow()
63#define SSGROW(need) if (PL_savestack_ix + (I32)(need) > PL_savestack_max) savestack_grow_cnt(need)
64#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
65#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
66#define SSPUSHBOOL(p) (PL_savestack[PL_savestack_ix++].any_bool = (p))
67#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
68#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
69#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
70#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
71#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
72#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
73#define SSPOPBOOL (PL_savestack[--PL_savestack_ix].any_bool)
74#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
75#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
76#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
77#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
78
79/*
80=head1 Callback Functions
81
82=for apidoc Ams||SAVETMPS
83Opening bracket for temporaries on a callback. See C<FREETMPS> and
84L<perlcall>.
85
86=for apidoc Ams||FREETMPS
87Closing bracket for temporaries on a callback. See C<SAVETMPS> and
88L<perlcall>.
89
90=for apidoc Ams||ENTER
91Opening bracket on a callback. See C<LEAVE> and L<perlcall>.
92
93=for apidoc Ams||LEAVE
94Closing bracket on a callback. See C<ENTER> and L<perlcall>.
95
96=cut
97*/
98
99#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
100#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
101
102#ifdef DEBUGGING
103#define ENTER \
104 STMT_START { \
105 push_scope(); \
106 DEBUG_SCOPE("ENTER") \
107 } STMT_END
108#define LEAVE \
109 STMT_START { \
110 DEBUG_SCOPE("LEAVE") \
111 pop_scope(); \
112 } STMT_END
113#else
114#define ENTER push_scope()
115#define LEAVE pop_scope()
116#endif
117#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
118
119#define SAVEI8(i) save_I8((I8*)&(i))
120#define SAVEI16(i) save_I16((I16*)&(i))
121#define SAVEI32(i) save_I32((I32*)&(i))
122#define SAVEINT(i) save_int((int*)&(i))
123#define SAVEIV(i) save_iv((IV*)&(i))
124#define SAVELONG(l) save_long((long*)&(l))
125#define SAVEBOOL(b) save_bool((bool*)&(b))
126#define SAVESPTR(s) save_sptr((SV**)&(s))
127#define SAVEPPTR(s) save_pptr((char**)&(s))
128#define SAVEVPTR(s) save_vptr((void*)&(s))
129#define SAVEPADSV(s) save_padsv(s)
130#define SAVEFREESV(s) save_freesv((SV*)(s))
131#define SAVEMORTALIZESV(s) save_mortalizesv((SV*)(s))
132#define SAVEFREEOP(o) save_freeop((OP*)(o))
133#define SAVEFREEPV(p) save_freepv((char*)(p))
134#define SAVECLEARSV(sv) save_clearsv((SV**)&(sv))
135#define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
136#define SAVEGENERICPV(s) save_generic_pvref((char**)&(s))
137#define SAVESHAREDPV(s) save_shared_pvref((char**)&(s))
138#define SAVESETSVFLAGS(sv,mask,val) save_set_svflags(sv,mask,val)
139#define SAVEDELETE(h,k,l) \
140 save_delete((HV*)(h), (char*)(k), (I32)(l))
141#define SAVEDESTRUCTOR(f,p) \
142 save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), (void*)(p))
143
144#define SAVEDESTRUCTOR_X(f,p) \
145 save_destructor_x((DESTRUCTORFUNC_t)(f), (void*)(p))
146
147#define SAVESTACK_POS() \
148 STMT_START { \
149 SSCHECK(2); \
150 SSPUSHINT(PL_stack_sp - PL_stack_base); \
151 SSPUSHINT(SAVEt_STACK_POS); \
152 } STMT_END
153
154#define SAVEOP() save_op()
155
156#define SAVEHINTS() \
157 STMT_START { \
158 SSCHECK(4); \
159 if (PL_hints & HINT_LOCALIZE_HH) { \
160 SSPUSHPTR(GvHV(PL_hintgv)); \
161 GvHV(PL_hintgv) = Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv)); \
162 } \
163 if (PL_compiling.cop_hints_hash) { \
164 HINTS_REFCNT_LOCK; \
165 PL_compiling.cop_hints_hash->refcounted_he_refcnt++; \
166 HINTS_REFCNT_UNLOCK; \
167 } \
168 SSPUSHPTR(PL_compiling.cop_hints_hash); \
169 SSPUSHINT(PL_hints); \
170 SSPUSHINT(SAVEt_HINTS); \
171 } STMT_END
172
173#define SAVECOMPPAD() \
174 STMT_START { \
175 SSCHECK(2); \
176 SSPUSHPTR((SV*)PL_comppad); \
177 SSPUSHINT(SAVEt_COMPPAD); \
178 } STMT_END
179
180#define SAVESWITCHSTACK(f,t) \
181 STMT_START { \
182 SSCHECK(3); \
183 SSPUSHPTR((SV*)(f)); \
184 SSPUSHPTR((SV*)(t)); \
185 SSPUSHINT(SAVEt_SAVESWITCHSTACK); \
186 SWITCHSTACK((f),(t)); \
187 PL_curstackinfo->si_stack = (t); \
188 } STMT_END
189
190#define SAVECOPARYBASE(c) \
191 STMT_START { \
192 SSCHECK(3); \
193 SSPUSHINT(CopARYBASE_get(c)); \
194 SSPUSHPTR(c); \
195 SSPUSHINT(SAVEt_COP_ARYBASE); \
196 } STMT_END
197
198/* Need to do the cop warnings like this, rather than a "SAVEFREESHAREDPV",
199 because realloc() means that the value can actually change. Possibly
200 could have done savefreesharedpvREF, but this way actually seems cleaner,
201 as it simplifies the code that does the saves, and reduces the load on the
202 save stack. */
203#define SAVECOMPILEWARNINGS() \
204 STMT_START { \
205 SSCHECK(2); \
206 SSPUSHPTR(PL_compiling.cop_warnings); \
207 SSPUSHINT(SAVEt_COMPILE_WARNINGS); \
208 } STMT_END
209
210#define SAVESTACK_CXPOS() \
211 STMT_START { \
212 SSCHECK(3); \
213 SSPUSHINT(cxstack[cxstack_ix].blk_oldsp); \
214 SSPUSHINT(cxstack_ix); \
215 SSPUSHINT(SAVEt_STACK_CXPOS); \
216 } STMT_END
217
218#define SAVEPARSER(p) \
219 STMT_START { \
220 SSCHECK(2); \
221 SSPUSHPTR(p); \
222 SSPUSHINT(SAVEt_PARSER); \
223 } STMT_END
224
225#ifdef USE_ITHREADS
226# define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c))
227# define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c))
228# define SAVECOPFILE(c) SAVEPPTR(CopFILE(c))
229# define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c))
230# define SAVECOPLABEL(c) SAVEPPTR(CopLABEL(c))
231# define SAVECOPLABEL_FREE(c) SAVESHAREDPV(CopLABEL(c))
232#else
233# define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c))
234# define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */
235# define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c))
236# define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c))
237# define SAVECOPLABEL(c) SAVEPPTR(CopLABEL(c))
238# define SAVECOPLABEL_FREE(c) SAVEPPTR(CopLABEL(c))
239#endif
240
241#define SAVECOPLINE(c) SAVEI32(CopLINE(c))
242
243/* SSNEW() temporarily allocates a specified number of bytes of data on the
244 * savestack. It returns an integer index into the savestack, because a
245 * pointer would get broken if the savestack is moved on reallocation.
246 * SSNEWa() works like SSNEW(), but also aligns the data to the specified
247 * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
248 * alignment will be preserved therough savestack reallocation *only* if
249 * realloc returns data aligned to a size divisible by "align"!
250 *
251 * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
252 */
253
254#define SSNEW(size) Perl_save_alloc(aTHX_ (size), 0)
255#define SSNEWt(n,t) SSNEW((n)*sizeof(t))
256#define SSNEWa(size,align) Perl_save_alloc(aTHX_ (size), \
257 (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
258#define SSNEWat(n,t,align) SSNEWa((n)*sizeof(t), align)
259
260#define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
261#define SSPTRt(off,type) ((type*) ((char*)PL_savestack + off))
262
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