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root |
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/* scope.h |
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* |
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* Copyright (C) 1993, 1994, 1996, 1997, 1998, 1999, |
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* 2000, 2001, 2002, 2004, 2005 by Larry Wall and others |
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* |
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* You may distribute under the terms of either the GNU General Public |
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* License or the Artistic License, as specified in the README file. |
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* |
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*/ |
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#define SAVEt_ITEM 0 |
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#define SAVEt_SV 1 |
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#define SAVEt_AV 2 |
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#define SAVEt_HV 3 |
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#define SAVEt_INT 4 |
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#define SAVEt_LONG 5 |
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#define SAVEt_I32 6 |
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#define SAVEt_IV 7 |
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#define SAVEt_SPTR 8 |
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#define SAVEt_APTR 9 |
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#define SAVEt_HPTR 10 |
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#define SAVEt_PPTR 11 |
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#define SAVEt_NSTAB 12 |
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#define SAVEt_SVREF 13 |
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#define SAVEt_GP 14 |
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#define SAVEt_FREESV 15 |
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#define SAVEt_FREEOP 16 |
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#define SAVEt_FREEPV 17 |
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#define SAVEt_CLEARSV 18 |
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#define SAVEt_DELETE 19 |
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#define SAVEt_DESTRUCTOR 20 |
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#define SAVEt_REGCONTEXT 21 |
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#define SAVEt_STACK_POS 22 |
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#define SAVEt_I16 23 |
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#define SAVEt_AELEM 24 |
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#define SAVEt_HELEM 25 |
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#define SAVEt_OP 26 |
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#define SAVEt_HINTS 27 |
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#define SAVEt_ALLOC 28 |
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#define SAVEt_GENERIC_SVREF 29 |
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#define SAVEt_DESTRUCTOR_X 30 |
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#define SAVEt_VPTR 31 |
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#define SAVEt_I8 32 |
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#define SAVEt_COMPPAD 33 |
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#define SAVEt_GENERIC_PVREF 34 |
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#define SAVEt_PADSV 35 |
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#define SAVEt_MORTALIZESV 36 |
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#define SAVEt_SHARED_PVREF 37 |
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#define SAVEt_BOOL 38 |
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#define SAVEt_SAVESWITCHSTACK 40 |
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#ifndef SCOPE_SAVES_SIGNAL_MASK |
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#define SCOPE_SAVES_SIGNAL_MASK 0 |
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#endif |
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#define SSCHECK(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow() |
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#define SSGROW(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow_cnt(need) |
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#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i)) |
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#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i)) |
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#define SSPUSHBOOL(p) (PL_savestack[PL_savestack_ix++].any_bool = (p)) |
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#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i)) |
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#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p)) |
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#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p)) |
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#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p)) |
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#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32) |
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#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long) |
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#define SSPOPBOOL (PL_savestack[--PL_savestack_ix].any_bool) |
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#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv) |
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#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr) |
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#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr) |
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#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr) |
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/* |
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=head1 Callback Functions |
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=for apidoc Ams||SAVETMPS |
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Opening bracket for temporaries on a callback. See C<FREETMPS> and |
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L<perlcall>. |
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=for apidoc Ams||FREETMPS |
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Closing bracket for temporaries on a callback. See C<SAVETMPS> and |
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L<perlcall>. |
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=for apidoc Ams||ENTER |
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Opening bracket on a callback. See C<LEAVE> and L<perlcall>. |
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=for apidoc Ams||LEAVE |
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Closing bracket on a callback. See C<ENTER> and L<perlcall>. |
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=cut |
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*/ |
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#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix |
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#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps() |
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#ifdef DEBUGGING |
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#define ENTER \ |
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STMT_START { \ |
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push_scope(); \ |
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DEBUG_SCOPE("ENTER") \ |
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} STMT_END |
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#define LEAVE \ |
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STMT_START { \ |
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DEBUG_SCOPE("LEAVE") \ |
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pop_scope(); \ |
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} STMT_END |
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#else |
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#define ENTER push_scope() |
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#define LEAVE pop_scope() |
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#endif |
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#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old) |
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/* |
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* Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV |
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* because these are used for several kinds of pointer values |
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*/ |
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#define SAVEI8(i) save_I8(SOFT_CAST(I8*)&(i)) |
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#define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i)) |
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#define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i)) |
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#define SAVEINT(i) save_int(SOFT_CAST(int*)&(i)) |
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#define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i)) |
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#define SAVELONG(l) save_long(SOFT_CAST(long*)&(l)) |
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#define SAVEBOOL(b) save_bool(SOFT_CAST(bool*)&(b)) |
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#define SAVESPTR(s) save_sptr((SV**)&(s)) |
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#define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s)) |
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#define SAVEVPTR(s) save_vptr((void*)&(s)) |
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#define SAVEPADSV(s) save_padsv(s) |
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#define SAVEFREESV(s) save_freesv((SV*)(s)) |
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#define SAVEMORTALIZESV(s) save_mortalizesv((SV*)(s)) |
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#define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o)) |
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#define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p)) |
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#define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv)) |
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#define SAVEGENERICSV(s) save_generic_svref((SV**)&(s)) |
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#define SAVEGENERICPV(s) save_generic_pvref((char**)&(s)) |
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#define SAVESHAREDPV(s) save_shared_pvref((char**)&(s)) |
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#define SAVEDELETE(h,k,l) \ |
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save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l)) |
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#define SAVEDESTRUCTOR(f,p) \ |
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save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p)) |
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#define SAVEDESTRUCTOR_X(f,p) \ |
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save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p)) |
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#define SAVESTACK_POS() \ |
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STMT_START { \ |
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SSCHECK(2); \ |
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SSPUSHINT(PL_stack_sp - PL_stack_base); \ |
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SSPUSHINT(SAVEt_STACK_POS); \ |
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} STMT_END |
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#define SAVEOP() save_op() |
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#define SAVEHINTS() \ |
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STMT_START { \ |
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SSCHECK(3); \ |
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if (PL_hints & HINT_LOCALIZE_HH) { \ |
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SSPUSHPTR(GvHV(PL_hintgv)); \ |
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GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv)); \ |
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} \ |
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SSPUSHINT(PL_hints); \ |
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SSPUSHINT(SAVEt_HINTS); \ |
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} STMT_END |
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#define SAVECOMPPAD() \ |
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STMT_START { \ |
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SSCHECK(2); \ |
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SSPUSHPTR((SV*)PL_comppad); \ |
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SSPUSHINT(SAVEt_COMPPAD); \ |
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} STMT_END |
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#define SAVESWITCHSTACK(f,t) \ |
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STMT_START { \ |
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SSCHECK(3); \ |
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SSPUSHPTR((SV*)(f)); \ |
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SSPUSHPTR((SV*)(t)); \ |
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SSPUSHINT(SAVEt_SAVESWITCHSTACK); \ |
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SWITCHSTACK((f),(t)); \ |
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PL_curstackinfo->si_stack = (t); \ |
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} STMT_END |
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#ifdef USE_ITHREADS |
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# define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c)) |
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# define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c)) |
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# define SAVECOPFILE(c) SAVEPPTR(CopFILE(c)) |
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# define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c)) |
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#else |
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# define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c)) |
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# define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */ |
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# define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c)) |
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# define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c)) |
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#endif |
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#define SAVECOPLINE(c) SAVEI32(CopLINE(c)) |
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/* SSNEW() temporarily allocates a specified number of bytes of data on the |
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* savestack. It returns an integer index into the savestack, because a |
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* pointer would get broken if the savestack is moved on reallocation. |
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* SSNEWa() works like SSNEW(), but also aligns the data to the specified |
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* number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The |
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* alignment will be preserved therough savestack reallocation *only* if |
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* realloc returns data aligned to a size divisible by `align'! |
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* |
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* SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer. |
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*/ |
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#define SSNEW(size) Perl_save_alloc(aTHX_ (size), 0) |
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#define SSNEWt(n,t) SSNEW((n)*sizeof(t)) |
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#define SSNEWa(size,align) Perl_save_alloc(aTHX_ (size), \ |
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(align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align) |
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#define SSNEWat(n,t,align) SSNEWa((n)*sizeof(t), align) |
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#define SSPTR(off,type) ((type) ((char*)PL_savestack + off)) |
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#define SSPTRt(off,type) ((type*) ((char*)PL_savestack + off)) |
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/* A jmpenv packages the state required to perform a proper non-local jump. |
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* Note that there is a start_env initialized when perl starts, and top_env |
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* points to this initially, so top_env should always be non-null. |
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* |
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* Existence of a non-null top_env->je_prev implies it is valid to call |
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* longjmp() at that runlevel (we make sure start_env.je_prev is always |
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* null to ensure this). |
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* |
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* je_mustcatch, when set at any runlevel to TRUE, means eval ops must |
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* establish a local jmpenv to handle exception traps. Care must be taken |
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* to restore the previous value of je_mustcatch before exiting the |
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* stack frame iff JMPENV_PUSH was not called in that stack frame. |
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* GSAR 97-03-27 |
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*/ |
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struct jmpenv { |
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struct jmpenv * je_prev; |
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Sigjmp_buf je_buf; /* only for use if !je_throw */ |
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int je_ret; /* last exception thrown */ |
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bool je_mustcatch; /* need to call longjmp()? */ |
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#ifdef PERL_FLEXIBLE_EXCEPTIONS |
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void (*je_throw)(int v); /* last for bincompat */ |
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bool je_noset; /* no need for setjmp() */ |
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#endif |
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}; |
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typedef struct jmpenv JMPENV; |
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#ifdef OP_IN_REGISTER |
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#define OP_REG_TO_MEM PL_opsave = op |
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#define OP_MEM_TO_REG op = PL_opsave |
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#else |
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#define OP_REG_TO_MEM NOOP |
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#define OP_MEM_TO_REG NOOP |
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#endif |
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/* |
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* How to build the first jmpenv. |
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* |
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* top_env needs to be non-zero. It points to an area |
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* in which longjmp() stuff is stored, as C callstack |
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* info there at least is thread specific this has to |
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* be per-thread. Otherwise a 'die' in a thread gives |
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* that thread the C stack of last thread to do an eval {}! |
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*/ |
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#define JMPENV_BOOTSTRAP \ |
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STMT_START { \ |
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Zero(&PL_start_env, 1, JMPENV); \ |
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PL_start_env.je_ret = -1; \ |
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PL_start_env.je_mustcatch = TRUE; \ |
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PL_top_env = &PL_start_env; \ |
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} STMT_END |
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#ifdef PERL_FLEXIBLE_EXCEPTIONS |
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/* |
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* These exception-handling macros are split up to |
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* ease integration with C++ exceptions. |
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* |
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* To use C++ try+catch to catch Perl exceptions, an extension author |
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* needs to first write an extern "C" function to throw an appropriate |
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* exception object; typically it will be or contain an integer, |
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* because Perl's internals use integers to track exception types: |
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* extern "C" { static void thrower(int i) { throw i; } } |
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* |
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* Then (as shown below) the author needs to use, not the simple |
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* JMPENV_PUSH, but several of its constitutent macros, to arrange for |
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* the Perl internals to call thrower() rather than longjmp() to |
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* report exceptions: |
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* |
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* dJMPENV; |
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* JMPENV_PUSH_INIT(thrower); |
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* try { |
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* ... stuff that may throw exceptions ... |
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* } |
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* catch (int why) { // or whatever matches thrower() |
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* JMPENV_POST_CATCH; |
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* EXCEPT_SET(why); |
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* switch (why) { |
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* ... // handle various Perl exception codes |
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* } |
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* } |
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* JMPENV_POP; // don't forget this! |
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*/ |
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/* |
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* Function that catches/throws, and its callback for the |
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* body of protected processing. |
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*/ |
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typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list); |
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typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env, |
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int *, protect_body_t, ...); |
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#define dJMPENV JMPENV cur_env; \ |
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volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env) |
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#define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \ |
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STMT_START { \ |
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(ce).je_throw = (THROWFUNC); \ |
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(ce).je_ret = -1; \ |
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(ce).je_mustcatch = FALSE; \ |
| 317 |
|
|
(ce).je_prev = PL_top_env; \ |
| 318 |
|
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PL_top_env = &(ce); \ |
| 319 |
|
|
OP_REG_TO_MEM; \ |
| 320 |
|
|
} STMT_END |
| 321 |
|
|
|
| 322 |
|
|
#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(*(JMPENV*)pcur_env,THROWFUNC) |
| 323 |
|
|
|
| 324 |
|
|
#define JMPENV_POST_CATCH_ENV(ce) \ |
| 325 |
|
|
STMT_START { \ |
| 326 |
|
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OP_MEM_TO_REG; \ |
| 327 |
|
|
PL_top_env = &(ce); \ |
| 328 |
|
|
} STMT_END |
| 329 |
|
|
|
| 330 |
|
|
#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(*(JMPENV*)pcur_env) |
| 331 |
|
|
|
| 332 |
|
|
#define JMPENV_PUSH_ENV(ce,v) \ |
| 333 |
|
|
STMT_START { \ |
| 334 |
|
|
if (!(ce).je_noset) { \ |
| 335 |
|
|
DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \ |
| 336 |
|
|
ce, PL_top_env)); \ |
| 337 |
|
|
JMPENV_PUSH_INIT_ENV(ce,NULL); \ |
| 338 |
|
|
EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, SCOPE_SAVES_SIGNAL_MASK));\ |
| 339 |
|
|
(ce).je_noset = 1; \ |
| 340 |
|
|
} \ |
| 341 |
|
|
else \ |
| 342 |
|
|
EXCEPT_SET_ENV(ce,0); \ |
| 343 |
|
|
JMPENV_POST_CATCH_ENV(ce); \ |
| 344 |
|
|
(v) = EXCEPT_GET_ENV(ce); \ |
| 345 |
|
|
} STMT_END |
| 346 |
|
|
|
| 347 |
|
|
#define JMPENV_PUSH(v) JMPENV_PUSH_ENV(*(JMPENV*)pcur_env,v) |
| 348 |
|
|
|
| 349 |
|
|
#define JMPENV_POP_ENV(ce) \ |
| 350 |
|
|
STMT_START { \ |
| 351 |
|
|
if (PL_top_env == &(ce)) \ |
| 352 |
|
|
PL_top_env = (ce).je_prev; \ |
| 353 |
|
|
} STMT_END |
| 354 |
|
|
|
| 355 |
|
|
#define JMPENV_POP JMPENV_POP_ENV(*(JMPENV*)pcur_env) |
| 356 |
|
|
|
| 357 |
|
|
#define JMPENV_JUMP(v) \ |
| 358 |
|
|
STMT_START { \ |
| 359 |
|
|
OP_REG_TO_MEM; \ |
| 360 |
|
|
if (PL_top_env->je_prev) { \ |
| 361 |
|
|
if (PL_top_env->je_throw) \ |
| 362 |
|
|
PL_top_env->je_throw(v); \ |
| 363 |
|
|
else \ |
| 364 |
|
|
PerlProc_longjmp(PL_top_env->je_buf, (v)); \ |
| 365 |
|
|
} \ |
| 366 |
|
|
if ((v) == 2) \ |
| 367 |
|
|
PerlProc_exit(STATUS_NATIVE_EXPORT); \ |
| 368 |
|
|
PerlIO_printf(Perl_error_log, "panic: top_env\n"); \ |
| 369 |
|
|
PerlProc_exit(1); \ |
| 370 |
|
|
} STMT_END |
| 371 |
|
|
|
| 372 |
|
|
#define EXCEPT_GET_ENV(ce) ((ce).je_ret) |
| 373 |
|
|
#define EXCEPT_GET EXCEPT_GET_ENV(*(JMPENV*)pcur_env) |
| 374 |
|
|
#define EXCEPT_SET_ENV(ce,v) ((ce).je_ret = (v)) |
| 375 |
|
|
#define EXCEPT_SET(v) EXCEPT_SET_ENV(*(JMPENV*)pcur_env,v) |
| 376 |
|
|
|
| 377 |
|
|
#else /* !PERL_FLEXIBLE_EXCEPTIONS */ |
| 378 |
|
|
|
| 379 |
|
|
#define dJMPENV JMPENV cur_env |
| 380 |
|
|
|
| 381 |
|
|
#define JMPENV_PUSH(v) \ |
| 382 |
|
|
STMT_START { \ |
| 383 |
|
|
DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \ |
| 384 |
|
|
&cur_env, PL_top_env)); \ |
| 385 |
|
|
cur_env.je_prev = PL_top_env; \ |
| 386 |
|
|
OP_REG_TO_MEM; \ |
| 387 |
|
|
cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \ |
| 388 |
|
|
OP_MEM_TO_REG; \ |
| 389 |
|
|
PL_top_env = &cur_env; \ |
| 390 |
|
|
cur_env.je_mustcatch = FALSE; \ |
| 391 |
|
|
(v) = cur_env.je_ret; \ |
| 392 |
|
|
} STMT_END |
| 393 |
|
|
|
| 394 |
|
|
#define JMPENV_POP \ |
| 395 |
|
|
STMT_START { PL_top_env = cur_env.je_prev; } STMT_END |
| 396 |
|
|
|
| 397 |
|
|
#define JMPENV_JUMP(v) \ |
| 398 |
|
|
STMT_START { \ |
| 399 |
|
|
OP_REG_TO_MEM; \ |
| 400 |
|
|
if (PL_top_env->je_prev) \ |
| 401 |
|
|
PerlProc_longjmp(PL_top_env->je_buf, (v)); \ |
| 402 |
|
|
if ((v) == 2) \ |
| 403 |
|
|
PerlProc_exit(STATUS_NATIVE_EXPORT); \ |
| 404 |
|
|
PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \ |
| 405 |
|
|
PerlProc_exit(1); \ |
| 406 |
|
|
} STMT_END |
| 407 |
|
|
|
| 408 |
|
|
#endif /* PERL_FLEXIBLE_EXCEPTIONS */ |
| 409 |
|
|
|
| 410 |
|
|
#define CATCH_GET (PL_top_env->je_mustcatch) |
| 411 |
|
|
#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v)) |
