scope.h

   1 /*    scope.h
   2  *
   3  *    Copyright (C) 1993, 1994, 1996, 1997, 1998, 1999,
   4  *    2000, 2001, 2002, 2004, 2005 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
  54 #ifndef SCOPE_SAVES_SIGNAL_MASK
  55 #define SCOPE_SAVES_SIGNAL_MASK 0
  56 #endif
  57
  58 #define SSCHECK(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow()
  59 #define SSGROW(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow_cnt(need)
  60 #define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
  61 #define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
  62 #define SSPUSHBOOL(p) (PL_savestack[PL_savestack_ix++].any_bool = (p))
  63 #define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
  64 #define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
  65 #define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
  66 #define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
  67 #define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
  68 #define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
  69 #define SSPOPBOOL (PL_savestack[--PL_savestack_ix].any_bool)
  70 #define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
  71 #define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
  72 #define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
  73 #define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
  74
  75 /*
  76 =head1 Callback Functions
  77
  78 =for apidoc Ams||SAVETMPS
  79 Opening bracket for temporaries on a callback.  See C<FREETMPS> and
  80 L<perlcall>.
  81
  82 =for apidoc Ams||FREETMPS
  83 Closing bracket for temporaries on a callback.  See C<SAVETMPS> and
  84 L<perlcall>.
  85
  86 =for apidoc Ams||ENTER
  87 Opening bracket on a callback.  See C<LEAVE> and L<perlcall>.
  88
  89 =for apidoc Ams||LEAVE
  90 Closing bracket on a callback.  See C<ENTER> and L<perlcall>.
  91
  92 =cut
  93 */
  94
  95 #define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
  96 #define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
  97
  98 #ifdef DEBUGGING
  99 #define ENTER                                                   \
 100     STMT_START {                                                \
 101         push_scope();                                           \
 102         DEBUG_SCOPE("ENTER")                                    \
 103     } STMT_END
 104 #define LEAVE                                                   \
 105     STMT_START {                                                \
 106         DEBUG_SCOPE("LEAVE")                                    \
 107         pop_scope();                                            \
 108     } STMT_END
 109 #else
 110 #define ENTER push_scope()
 111 #define LEAVE pop_scope()
 112 #endif
 113 #define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
 114
 115 #define SAVEI8(i)       save_I8((I8*)&(i))
 116 #define SAVEI16(i)      save_I16((I16*)&(i))
 117 #define SAVEI32(i)      save_I32((I32*)&(i))
 118 #define SAVEINT(i)      save_int((int*)&(i))
 119 #define SAVEIV(i)       save_iv((IV*)&(i))
 120 #define SAVELONG(l)     save_long((long*)&(l))
 121 #define SAVEBOOL(b)     save_bool((bool*)&(b))
 122 #define SAVESPTR(s)     save_sptr((SV**)&(s))
 123 #define SAVEPPTR(s)     save_pptr((char**)&(s))
 124 #define SAVEVPTR(s)     save_vptr((void*)&(s))
 125 #define SAVEPADSV(s)    save_padsv(s)
 126 #define SAVEFREESV(s)   save_freesv((SV*)(s))
 127 #define SAVEMORTALIZESV(s)      save_mortalizesv((SV*)(s))
 128 #define SAVEFREEOP(o)   save_freeop((OP*)(o))
 129 #define SAVEFREEPV(p)   save_freepv((char*)(p))
 130 #define SAVECLEARSV(sv) save_clearsv((SV**)&(sv))
 131 #define SAVEGENERICSV(s)        save_generic_svref((SV**)&(s))
 132 #define SAVEGENERICPV(s)        save_generic_pvref((char**)&(s))
 133 #define SAVESHAREDPV(s)         save_shared_pvref((char**)&(s))
 134 #define SAVESETSVFLAGS(sv,mask,val)     save_set_svflags(sv,mask,val)
 135 #define SAVEDELETE(h,k,l) \
 136           save_delete((HV*)(h), (char*)(k), (I32)(l))
 137 #define SAVEDESTRUCTOR(f,p) \
 138           save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), (void*)(p))
 139
 140 #define SAVEDESTRUCTOR_X(f,p) \
 141           save_destructor_x((DESTRUCTORFUNC_t)(f), (void*)(p))
 142
 143 #define SAVESTACK_POS() \
 144     STMT_START {                                \
 145         SSCHECK(2);                             \
 146         SSPUSHINT(PL_stack_sp - PL_stack_base); \
 147         SSPUSHINT(SAVEt_STACK_POS);             \
 148     } STMT_END
 149
 150 #define SAVEOP()        save_op()
 151
 152 #define SAVEHINTS() \
 153     STMT_START {                                        \
 154         SSCHECK(4);                                     \
 155         if (PL_hints & HINT_LOCALIZE_HH) {              \
 156             SSPUSHPTR(GvHV(PL_hintgv));                 \
 157             GvHV(PL_hintgv) = Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv)); \
 158         }                                               \
 159         if (PL_compiling.cop_hints) {                   \
 160             PL_compiling.cop_hints->refcounted_he_refcnt++;     \
 161         }                                               \
 162         SSPUSHPTR(PL_compiling.cop_hints);              \
 163         SSPUSHINT(PL_hints);                            \
 164         SSPUSHINT(SAVEt_HINTS);                         \
 165     } STMT_END
 166
 167 #define SAVECOMPPAD() \
 168     STMT_START {                                                \
 169         SSCHECK(2);                                             \
 170         SSPUSHPTR((SV*)PL_comppad);                             \
 171         SSPUSHINT(SAVEt_COMPPAD);                               \
 172     } STMT_END
 173
 174 #define SAVESWITCHSTACK(f,t) \
 175     STMT_START {                                        \
 176         SSCHECK(3);                                     \
 177         SSPUSHPTR((SV*)(f));                            \
 178         SSPUSHPTR((SV*)(t));                            \
 179         SSPUSHINT(SAVEt_SAVESWITCHSTACK);               \
 180         SWITCHSTACK((f),(t));                           \
 181         PL_curstackinfo->si_stack = (t);                \
 182     } STMT_END
 183
 184 #define SAVECOPARYBASE(c) \
 185     STMT_START {                                        \
 186         SSCHECK(3);                                     \
 187         SSPUSHINT(CopARYBASE_get(c));                   \
 188         SSPUSHPTR(c);                                   \
 189         SSPUSHINT(SAVEt_COP_ARYBASE);                   \
 190     } STMT_END
 191
 192
 193 #ifdef USE_ITHREADS
 194 #  define SAVECOPSTASH(c)       SAVEPPTR(CopSTASHPV(c))
 195 #  define SAVECOPSTASH_FREE(c)  SAVESHAREDPV(CopSTASHPV(c))
 196 #  define SAVECOPFILE(c)        SAVEPPTR(CopFILE(c))
 197 #  define SAVECOPFILE_FREE(c)   SAVESHAREDPV(CopFILE(c))
 198 #else
 199 #  define SAVECOPSTASH(c)       SAVESPTR(CopSTASH(c))
 200 #  define SAVECOPSTASH_FREE(c)  SAVECOPSTASH(c) /* XXX not refcounted */
 201 #  define SAVECOPFILE(c)        SAVESPTR(CopFILEGV(c))
 202 #  define SAVECOPFILE_FREE(c)   SAVEGENERICSV(CopFILEGV(c))
 203 #endif
 204
 205 #define SAVECOPLINE(c)          SAVEI32(CopLINE(c))
 206
 207 /* SSNEW() temporarily allocates a specified number of bytes of data on the
 208  * savestack.  It returns an integer index into the savestack, because a
 209  * pointer would get broken if the savestack is moved on reallocation.
 210  * SSNEWa() works like SSNEW(), but also aligns the data to the specified
 211  * number of bytes.  MEM_ALIGNBYTES is perhaps the most useful.  The
 212  * alignment will be preserved therough savestack reallocation *only* if
 213  * realloc returns data aligned to a size divisible by "align"!
 214  *
 215  * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
 216  */
 217
 218 #define SSNEW(size)             Perl_save_alloc(aTHX_ (size), 0)
 219 #define SSNEWt(n,t)             SSNEW((n)*sizeof(t))
 220 #define SSNEWa(size,align)      Perl_save_alloc(aTHX_ (size), \
 221     (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
 222 #define SSNEWat(n,t,align)      SSNEWa((n)*sizeof(t), align)
 223
 224 #define SSPTR(off,type)         ((type)  ((char*)PL_savestack + off))
 225 #define SSPTRt(off,type)        ((type*) ((char*)PL_savestack + off))
 226