/* scope.h * * Copyright (C) 1993, 1994, 1996, 1997, 1998, 1999, * 2000, 2001, 2002, 2004, by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * */ #define SAVEt_ITEM 0 #define SAVEt_SV 1 #define SAVEt_AV 2 #define SAVEt_HV 3 #define SAVEt_INT 4 #define SAVEt_LONG 5 #define SAVEt_I32 6 #define SAVEt_IV 7 #define SAVEt_SPTR 8 #define SAVEt_APTR 9 #define SAVEt_HPTR 10 #define SAVEt_PPTR 11 #define SAVEt_NSTAB 12 #define SAVEt_SVREF 13 #define SAVEt_GP 14 #define SAVEt_FREESV 15 #define SAVEt_FREEOP 16 #define SAVEt_FREEPV 17 #define SAVEt_CLEARSV 18 #define SAVEt_DELETE 19 #define SAVEt_DESTRUCTOR 20 #define SAVEt_REGCONTEXT 21 #define SAVEt_STACK_POS 22 #define SAVEt_I16 23 #define SAVEt_AELEM 24 #define SAVEt_HELEM 25 #define SAVEt_OP 26 #define SAVEt_HINTS 27 #define SAVEt_ALLOC 28 #define SAVEt_GENERIC_SVREF 29 #define SAVEt_DESTRUCTOR_X 30 #define SAVEt_VPTR 31 #define SAVEt_I8 32 #define SAVEt_COMPPAD 33 #define SAVEt_GENERIC_PVREF 34 #define SAVEt_PADSV 35 #define SAVEt_MORTALIZESV 36 #define SAVEt_SHARED_PVREF 37 #define SAVEt_BOOL 38 #define SAVEt_SET_SVFLAGS 39 #define SAVEt_SAVESWITCHSTACK 40 #ifndef SCOPE_SAVES_SIGNAL_MASK #define SCOPE_SAVES_SIGNAL_MASK 0 #endif #define SSCHECK(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow() #define SSGROW(need) if (PL_savestack_ix + (need) > PL_savestack_max) savestack_grow_cnt(need) #define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i)) #define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i)) #define SSPUSHBOOL(p) (PL_savestack[PL_savestack_ix++].any_bool = (p)) #define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i)) #define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p)) #define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p)) #define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p)) #define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32) #define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long) #define SSPOPBOOL (PL_savestack[--PL_savestack_ix].any_bool) #define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv) #define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr) #define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr) #define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr) /* =head1 Callback Functions =for apidoc Ams||SAVETMPS Opening bracket for temporaries on a callback. See C and L. =for apidoc Ams||FREETMPS Closing bracket for temporaries on a callback. See C and L. =for apidoc Ams||ENTER Opening bracket on a callback. See C and L. =for apidoc Ams||LEAVE Closing bracket on a callback. See C and L. =cut */ #define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix #define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps() #ifdef DEBUGGING #define ENTER \ STMT_START { \ push_scope(); \ DEBUG_SCOPE("ENTER") \ } STMT_END #define LEAVE \ STMT_START { \ DEBUG_SCOPE("LEAVE") \ pop_scope(); \ } STMT_END #else #define ENTER push_scope() #define LEAVE pop_scope() #endif #define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old) /* * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV * because these are used for several kinds of pointer values */ #define SAVEI8(i) save_I8(SOFT_CAST(I8*)&(i)) #define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i)) #define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i)) #define SAVEINT(i) save_int(SOFT_CAST(int*)&(i)) #define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i)) #define SAVELONG(l) save_long(SOFT_CAST(long*)&(l)) #define SAVEBOOL(b) save_bool(SOFT_CAST(bool*)&(b)) #define SAVESPTR(s) save_sptr((SV**)&(s)) #define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s)) #define SAVEVPTR(s) save_vptr((void*)&(s)) #define SAVEPADSV(s) save_padsv(s) #define SAVEFREESV(s) save_freesv((SV*)(s)) #define SAVEMORTALIZESV(s) save_mortalizesv((SV*)(s)) #define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o)) #define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p)) #define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv)) #define SAVEGENERICSV(s) save_generic_svref((SV**)&(s)) #define SAVEGENERICPV(s) save_generic_pvref((char**)&(s)) #define SAVESHAREDPV(s) save_shared_pvref((char**)&(s)) #define SAVESETSVFLAGS(sv,mask,val) save_set_svflags(sv,mask,val) #define SAVEDELETE(h,k,l) \ save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l)) #define SAVEDESTRUCTOR(f,p) \ save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p)) #define SAVEDESTRUCTOR_X(f,p) \ save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p)) #define SAVESTACK_POS() \ STMT_START { \ SSCHECK(2); \ SSPUSHINT(PL_stack_sp - PL_stack_base); \ SSPUSHINT(SAVEt_STACK_POS); \ } STMT_END #define SAVEOP() save_op() #define SAVEHINTS() \ STMT_START { \ SSCHECK(3); \ if (PL_hints & HINT_LOCALIZE_HH) { \ SSPUSHPTR(GvHV(PL_hintgv)); \ GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv)); \ } \ SSPUSHINT(PL_hints); \ SSPUSHINT(SAVEt_HINTS); \ } STMT_END #define SAVECOMPPAD() \ STMT_START { \ SSCHECK(2); \ SSPUSHPTR((SV*)PL_comppad); \ SSPUSHINT(SAVEt_COMPPAD); \ } STMT_END #define SAVESWITCHSTACK(f,t) \ STMT_START { \ SSCHECK(3); \ SSPUSHPTR((SV*)(f)); \ SSPUSHPTR((SV*)(t)); \ SSPUSHINT(SAVEt_SAVESWITCHSTACK); \ SWITCHSTACK((f),(t)); \ PL_curstackinfo->si_stack = (t); \ } STMT_END #ifdef USE_ITHREADS # define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c)) # define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c)) # define SAVECOPFILE(c) SAVEPPTR(CopFILE(c)) # define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c)) #else # define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c)) # define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */ # define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c)) # define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c)) #endif #define SAVECOPLINE(c) SAVEI32(CopLINE(c)) /* SSNEW() temporarily allocates a specified number of bytes of data on the * savestack. It returns an integer index into the savestack, because a * pointer would get broken if the savestack is moved on reallocation. * SSNEWa() works like SSNEW(), but also aligns the data to the specified * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The * alignment will be preserved therough savestack reallocation *only* if * realloc returns data aligned to a size divisible by `align'! * * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer. */ #define SSNEW(size) Perl_save_alloc(aTHX_ (size), 0) #define SSNEWt(n,t) SSNEW((n)*sizeof(t)) #define SSNEWa(size,align) Perl_save_alloc(aTHX_ (size), \ (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align) #define SSNEWat(n,t,align) SSNEWa((n)*sizeof(t), align) #define SSPTR(off,type) ((type) ((char*)PL_savestack + off)) #define SSPTRt(off,type) ((type*) ((char*)PL_savestack + off)) /* A jmpenv packages the state required to perform a proper non-local jump. * Note that there is a start_env initialized when perl starts, and top_env * points to this initially, so top_env should always be non-null. * * Existence of a non-null top_env->je_prev implies it is valid to call * longjmp() at that runlevel (we make sure start_env.je_prev is always * null to ensure this). * * je_mustcatch, when set at any runlevel to TRUE, means eval ops must * establish a local jmpenv to handle exception traps. Care must be taken * to restore the previous value of je_mustcatch before exiting the * stack frame iff JMPENV_PUSH was not called in that stack frame. * GSAR 97-03-27 */ struct jmpenv { struct jmpenv * je_prev; Sigjmp_buf je_buf; /* only for use if !je_throw */ int je_ret; /* last exception thrown */ bool je_mustcatch; /* need to call longjmp()? */ #ifdef PERL_FLEXIBLE_EXCEPTIONS void (*je_throw)(int v); /* last for bincompat */ bool je_noset; /* no need for setjmp() */ #endif }; typedef struct jmpenv JMPENV; #ifdef OP_IN_REGISTER #define OP_REG_TO_MEM PL_opsave = op #define OP_MEM_TO_REG op = PL_opsave #else #define OP_REG_TO_MEM NOOP #define OP_MEM_TO_REG NOOP #endif /* * How to build the first jmpenv. * * top_env needs to be non-zero. It points to an area * in which longjmp() stuff is stored, as C callstack * info there at least is thread specific this has to * be per-thread. Otherwise a 'die' in a thread gives * that thread the C stack of last thread to do an eval {}! */ #define JMPENV_BOOTSTRAP \ STMT_START { \ Zero(&PL_start_env, 1, JMPENV); \ PL_start_env.je_ret = -1; \ PL_start_env.je_mustcatch = TRUE; \ PL_top_env = &PL_start_env; \ } STMT_END #ifdef PERL_FLEXIBLE_EXCEPTIONS /* * These exception-handling macros are split up to * ease integration with C++ exceptions. * * To use C++ try+catch to catch Perl exceptions, an extension author * needs to first write an extern "C" function to throw an appropriate * exception object; typically it will be or contain an integer, * because Perl's internals use integers to track exception types: * extern "C" { static void thrower(int i) { throw i; } } * * Then (as shown below) the author needs to use, not the simple * JMPENV_PUSH, but several of its constitutent macros, to arrange for * the Perl internals to call thrower() rather than longjmp() to * report exceptions: * * dJMPENV; * JMPENV_PUSH_INIT(thrower); * try { * ... stuff that may throw exceptions ... * } * catch (int why) { // or whatever matches thrower() * JMPENV_POST_CATCH; * EXCEPT_SET(why); * switch (why) { * ... // handle various Perl exception codes * } * } * JMPENV_POP; // don't forget this! */ /* * Function that catches/throws, and its callback for the * body of protected processing. */ typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list); typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env, int *, protect_body_t, ...); #define dJMPENV JMPENV cur_env; \ volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env) #define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \ STMT_START { \ (ce).je_throw = (THROWFUNC); \ (ce).je_ret = -1; \ (ce).je_mustcatch = FALSE; \ (ce).je_prev = PL_top_env; \ PL_top_env = &(ce); \ OP_REG_TO_MEM; \ } STMT_END #define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(*(JMPENV*)pcur_env,THROWFUNC) #define JMPENV_POST_CATCH_ENV(ce) \ STMT_START { \ OP_MEM_TO_REG; \ PL_top_env = &(ce); \ } STMT_END #define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(*(JMPENV*)pcur_env) #define JMPENV_PUSH_ENV(ce,v) \ STMT_START { \ if (!(ce).je_noset) { \ DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \ ce, PL_top_env)); \ JMPENV_PUSH_INIT_ENV(ce,NULL); \ EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, SCOPE_SAVES_SIGNAL_MASK));\ (ce).je_noset = 1; \ } \ else \ EXCEPT_SET_ENV(ce,0); \ JMPENV_POST_CATCH_ENV(ce); \ (v) = EXCEPT_GET_ENV(ce); \ } STMT_END #define JMPENV_PUSH(v) JMPENV_PUSH_ENV(*(JMPENV*)pcur_env,v) #define JMPENV_POP_ENV(ce) \ STMT_START { \ if (PL_top_env == &(ce)) \ PL_top_env = (ce).je_prev; \ } STMT_END #define JMPENV_POP JMPENV_POP_ENV(*(JMPENV*)pcur_env) #define JMPENV_JUMP(v) \ STMT_START { \ OP_REG_TO_MEM; \ if (PL_top_env->je_prev) { \ if (PL_top_env->je_throw) \ PL_top_env->je_throw(v); \ else \ PerlProc_longjmp(PL_top_env->je_buf, (v)); \ } \ if ((v) == 2) \ PerlProc_exit(STATUS_NATIVE_EXPORT); \ PerlIO_printf(Perl_error_log, "panic: top_env\n"); \ PerlProc_exit(1); \ } STMT_END #define EXCEPT_GET_ENV(ce) ((ce).je_ret) #define EXCEPT_GET EXCEPT_GET_ENV(*(JMPENV*)pcur_env) #define EXCEPT_SET_ENV(ce,v) ((ce).je_ret = (v)) #define EXCEPT_SET(v) EXCEPT_SET_ENV(*(JMPENV*)pcur_env,v) #else /* !PERL_FLEXIBLE_EXCEPTIONS */ #define dJMPENV JMPENV cur_env #define JMPENV_PUSH(v) \ STMT_START { \ DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \ &cur_env, PL_top_env)); \ cur_env.je_prev = PL_top_env; \ OP_REG_TO_MEM; \ cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \ OP_MEM_TO_REG; \ PL_top_env = &cur_env; \ cur_env.je_mustcatch = FALSE; \ (v) = cur_env.je_ret; \ } STMT_END #define JMPENV_POP \ STMT_START { \ DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p\n", \ PL_top_env, cur_env.je_prev)); \ PL_top_env = cur_env.je_prev; \ } STMT_END #define JMPENV_JUMP(v) \ STMT_START { \ OP_REG_TO_MEM; \ if (PL_top_env->je_prev) \ PerlProc_longjmp(PL_top_env->je_buf, (v)); \ if ((v) == 2) \ PerlProc_exit(STATUS_NATIVE_EXPORT); \ PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \ PerlProc_exit(1); \ } STMT_END #endif /* PERL_FLEXIBLE_EXCEPTIONS */ #define CATCH_GET (PL_top_env->je_mustcatch) #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))