X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=scope.h;h=efaf58909232f240b2bea3afc9a1f93c5c91f6be;hb=04f720db660f11635846523a2f8eb8c7ddebb221;hp=24d98e4acd5a54954101abb6e8156bd425eb3b2c;hpb=3280af22f58e7b37514ed104858e2c2fc55ceeeb;p=p5sagit%2Fp5-mst-13.2.git diff --git a/scope.h b/scope.h index 24d98e4..efaf589 100644 --- a/scope.h +++ b/scope.h @@ -1,31 +1,33 @@ -#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_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 SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow() #define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i)) @@ -46,12 +48,12 @@ #define ENTER \ STMT_START { \ push_scope(); \ - DEBUG_l(WITH_THR(deb("ENTER scope %ld at %s:%d\n", \ + DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \ PL_scopestack_ix, __FILE__, __LINE__))); \ } STMT_END #define LEAVE \ STMT_START { \ - DEBUG_l(WITH_THR(deb("LEAVE scope %ld at %s:%d\n", \ + DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \ PL_scopestack_ix, __FILE__, __LINE__))); \ pop_scope(); \ } STMT_END @@ -62,7 +64,7 @@ #define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old) /* - * Not using SOFT_CAST on SAVEFREESV and SAVEFREESV + * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV * because these are used for several kinds of pointer values */ #define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i)) @@ -76,19 +78,12 @@ #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 SAVEDELETE(h,k,l) \ save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l)) -#ifdef PERL_OBJECT -#define CALLDESTRUCTOR this->*SSPOPDPTR +#define CALLDESTRUCTOR (*SSPOPDPTR) #define SAVEDESTRUCTOR(f,p) \ - save_destructor((DESTRUCTORFUNC)(FUNC_NAME_TO_PTR(f)), \ - SOFT_CAST(void*)(p)) -#else -#define CALLDESTRUCTOR *SSPOPDPTR -#define SAVEDESTRUCTOR(f,p) \ - save_destructor(SOFT_CAST(void(*)_((void*)))(FUNC_NAME_TO_PTR(f)), \ - SOFT_CAST(void*)(p)) -#endif + save_destructor((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p)) #define SAVESTACK_POS() \ STMT_START { \ @@ -110,6 +105,23 @@ } \ } STMT_END +/* 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) save_alloc(size, 0) +#define SSNEWa(size,align) save_alloc(size, \ + (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align) + +#define SSPTR(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. @@ -127,45 +139,136 @@ struct jmpenv { struct jmpenv * je_prev; - Sigjmp_buf je_buf; - int je_ret; /* return value of last setjmp() */ - bool je_mustcatch; /* longjmp()s must be caught locally */ + Sigjmp_buf je_buf; /* only for use if !je_throw */ + int je_ret; /* last exception thrown */ + bool je_mustcatch; /* need to call longjmp()? */ + void (*je_throw)(int v); /* last for bincompat */ }; typedef struct jmpenv JMPENV; +/* + * 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_ int *, protect_body_t, ...); + +/* + * 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 { \ + PL_start_env.je_prev = NULL; \ + PL_start_env.je_throw = NULL; \ + PL_start_env.je_ret = -1; \ + PL_start_env.je_mustcatch = TRUE; \ + PL_top_env = &PL_start_env; \ + } STMT_END + #ifdef OP_IN_REGISTER -#define OP_REG_TO_MEM opsave = op -#define OP_MEM_TO_REG op = opsave +#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 +/* + * 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! + */ + #define dJMPENV JMPENV cur_env -#define JMPENV_PUSH(v) \ + +#define JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC) \ STMT_START { \ + cur_env.je_throw = (THROWFUNC); \ + cur_env.je_ret = -1; \ + cur_env.je_mustcatch = FALSE; \ cur_env.je_prev = PL_top_env; \ + PL_top_env = &cur_env; \ OP_REG_TO_MEM; \ - cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, 1); \ + } STMT_END + +#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC) + +#define JMPENV_POST_CATCH_ENV(cur_env) \ + STMT_START { \ OP_MEM_TO_REG; \ PL_top_env = &cur_env; \ - cur_env.je_mustcatch = FALSE; \ - (v) = cur_env.je_ret; \ } STMT_END -#define JMPENV_POP \ + +#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(cur_env) + + +#define JMPENV_PUSH_ENV(cur_env,v) \ + STMT_START { \ + JMPENV_PUSH_INIT_ENV(cur_env,NULL); \ + EXCEPT_SET_ENV(cur_env,PerlProc_setjmp(cur_env.je_buf, 1)); \ + JMPENV_POST_CATCH_ENV(cur_env); \ + (v) = EXCEPT_GET_ENV(cur_env); \ + } STMT_END + +#define JMPENV_PUSH(v) JMPENV_PUSH_ENV(cur_env,v) + +#define JMPENV_POP_ENV(cur_env) \ STMT_START { PL_top_env = cur_env.je_prev; } STMT_END + +#define JMPENV_POP JMPENV_POP_ENV(cur_env) + #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 (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); \ + PerlProc_exit(STATUS_NATIVE_EXPORT); \ PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \ - PerlProc_exit(1); \ + PerlProc_exit(1); \ } STMT_END - + +#define EXCEPT_GET_ENV(cur_env) (cur_env.je_ret) +#define EXCEPT_GET EXCEPT_GET_ENV(cur_env) +#define EXCEPT_SET_ENV(cur_env,v) (cur_env.je_ret = (v)) +#define EXCEPT_SET(v) EXCEPT_SET_ENV(cur_env,v) + #define CATCH_GET (PL_top_env->je_mustcatch) #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))