13 #define SAVEt_NSTAB 12
14 #define SAVEt_SVREF 13
16 #define SAVEt_FREESV 15
17 #define SAVEt_FREEOP 16
18 #define SAVEt_FREEPV 17
19 #define SAVEt_CLEARSV 18
20 #define SAVEt_DELETE 19
21 #define SAVEt_DESTRUCTOR 20
22 #define SAVEt_REGCONTEXT 21
23 #define SAVEt_STACK_POS 22
25 #define SAVEt_AELEM 24
26 #define SAVEt_HELEM 25
28 #define SAVEt_HINTS 27
29 #define SAVEt_ALLOC 28
30 #define SAVEt_GENERIC_SVREF 29
31 #define SAVEt_DESTRUCTOR_X 30
34 #define SAVEt_COMPPAD 33
35 #define SAVEt_GENERIC_PVREF 34
36 #define SAVEt_PADSV 35
37 #define SAVEt_MORTALIZESV 36
38 #define SAVEt_SHARED_PVREF 37
40 #ifndef SCOPE_SAVES_SIGNAL_MASK
41 #define SCOPE_SAVES_SIGNAL_MASK 0
44 #define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
45 #define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
46 #define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
47 #define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
48 #define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
49 #define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
50 #define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
51 #define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
52 #define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
53 #define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
54 #define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
55 #define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
56 #define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
59 =head1 Callback Functions
61 =for apidoc Ams||SAVETMPS
62 Opening bracket for temporaries on a callback. See C<FREETMPS> and
65 =for apidoc Ams||FREETMPS
66 Closing bracket for temporaries on a callback. See C<SAVETMPS> and
69 =for apidoc Ams||ENTER
70 Opening bracket on a callback. See C<LEAVE> and L<perlcall>.
72 =for apidoc Ams||LEAVE
73 Closing bracket on a callback. See C<ENTER> and L<perlcall>.
78 #define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
79 #define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
85 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \
86 PL_scopestack_ix, __FILE__, __LINE__))); \
90 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \
91 PL_scopestack_ix, __FILE__, __LINE__))); \
95 #define ENTER push_scope()
96 #define LEAVE pop_scope()
98 #define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
101 * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
102 * because these are used for several kinds of pointer values
104 #define SAVEI8(i) save_I8(SOFT_CAST(I8*)&(i))
105 #define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i))
106 #define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i))
107 #define SAVEINT(i) save_int(SOFT_CAST(int*)&(i))
108 #define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i))
109 #define SAVELONG(l) save_long(SOFT_CAST(long*)&(l))
110 #define SAVESPTR(s) save_sptr((SV**)&(s))
111 #define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s))
112 #define SAVEVPTR(s) save_vptr((void*)&(s))
113 #define SAVEPADSV(s) save_padsv(s)
114 #define SAVEFREESV(s) save_freesv((SV*)(s))
115 #define SAVEMORTALIZESV(s) save_mortalizesv((SV*)(s))
116 #define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o))
117 #define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p))
118 #define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv))
119 #define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
120 #define SAVEGENERICPV(s) save_generic_pvref((char**)&(s))
121 #define SAVESHAREDPV(s) save_shared_pvref((char**)&(s))
122 #define SAVEDELETE(h,k,l) \
123 save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l))
124 #define SAVEDESTRUCTOR(f,p) \
125 save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p))
127 #define SAVEDESTRUCTOR_X(f,p) \
128 save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p))
130 #define SAVESTACK_POS() \
133 SSPUSHINT(PL_stack_sp - PL_stack_base); \
134 SSPUSHINT(SAVEt_STACK_POS); \
137 #define SAVEOP() save_op()
139 #define SAVEHINTS() \
141 if (PL_hints & HINT_LOCALIZE_HH) \
145 SSPUSHINT(PL_hints); \
146 SSPUSHINT(SAVEt_HINTS); \
150 #define SAVECOMPPAD() \
152 if (PL_comppad && PL_curpad == AvARRAY(PL_comppad)) { \
154 SSPUSHPTR((SV*)PL_comppad); \
155 SSPUSHINT(SAVEt_COMPPAD); \
158 SAVEVPTR(PL_curpad); \
159 SAVESPTR(PL_comppad); \
164 # define SAVECOPSTASH(c) SAVEPPTR(CopSTASHPV(c))
165 # define SAVECOPSTASH_FREE(c) SAVESHAREDPV(CopSTASHPV(c))
166 # define SAVECOPFILE(c) SAVEPPTR(CopFILE(c))
167 # define SAVECOPFILE_FREE(c) SAVESHAREDPV(CopFILE(c))
169 # define SAVECOPSTASH(c) SAVESPTR(CopSTASH(c))
170 # define SAVECOPSTASH_FREE(c) SAVECOPSTASH(c) /* XXX not refcounted */
171 # define SAVECOPFILE(c) SAVESPTR(CopFILEGV(c))
172 # define SAVECOPFILE_FREE(c) SAVEGENERICSV(CopFILEGV(c))
175 #define SAVECOPLINE(c) SAVEI16(CopLINE(c))
177 /* SSNEW() temporarily allocates a specified number of bytes of data on the
178 * savestack. It returns an integer index into the savestack, because a
179 * pointer would get broken if the savestack is moved on reallocation.
180 * SSNEWa() works like SSNEW(), but also aligns the data to the specified
181 * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
182 * alignment will be preserved therough savestack reallocation *only* if
183 * realloc returns data aligned to a size divisible by `align'!
185 * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
188 #define SSNEW(size) Perl_save_alloc(aTHX_ (size), 0)
189 #define SSNEWt(n,t) SSNEW((n)*sizeof(t))
190 #define SSNEWa(size,align) Perl_save_alloc(aTHX_ (size), \
191 (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
192 #define SSNEWat(n,t,align) SSNEWa((n)*sizeof(t), align)
194 #define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
195 #define SSPTRt(off,type) ((type*) ((char*)PL_savestack + off))
197 /* A jmpenv packages the state required to perform a proper non-local jump.
198 * Note that there is a start_env initialized when perl starts, and top_env
199 * points to this initially, so top_env should always be non-null.
201 * Existence of a non-null top_env->je_prev implies it is valid to call
202 * longjmp() at that runlevel (we make sure start_env.je_prev is always
203 * null to ensure this).
205 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
206 * establish a local jmpenv to handle exception traps. Care must be taken
207 * to restore the previous value of je_mustcatch before exiting the
208 * stack frame iff JMPENV_PUSH was not called in that stack frame.
213 struct jmpenv * je_prev;
214 Sigjmp_buf je_buf; /* only for use if !je_throw */
215 int je_ret; /* last exception thrown */
216 bool je_mustcatch; /* need to call longjmp()? */
217 #ifdef PERL_FLEXIBLE_EXCEPTIONS
218 void (*je_throw)(int v); /* last for bincompat */
219 bool je_noset; /* no need for setjmp() */
223 typedef struct jmpenv JMPENV;
225 #ifdef OP_IN_REGISTER
226 #define OP_REG_TO_MEM PL_opsave = op
227 #define OP_MEM_TO_REG op = PL_opsave
229 #define OP_REG_TO_MEM NOOP
230 #define OP_MEM_TO_REG NOOP
234 * How to build the first jmpenv.
236 * top_env needs to be non-zero. It points to an area
237 * in which longjmp() stuff is stored, as C callstack
238 * info there at least is thread specific this has to
239 * be per-thread. Otherwise a 'die' in a thread gives
240 * that thread the C stack of last thread to do an eval {}!
243 #define JMPENV_BOOTSTRAP \
245 Zero(&PL_start_env, 1, JMPENV); \
246 PL_start_env.je_ret = -1; \
247 PL_start_env.je_mustcatch = TRUE; \
248 PL_top_env = &PL_start_env; \
251 #ifdef PERL_FLEXIBLE_EXCEPTIONS
254 * These exception-handling macros are split up to
255 * ease integration with C++ exceptions.
257 * To use C++ try+catch to catch Perl exceptions, an extension author
258 * needs to first write an extern "C" function to throw an appropriate
259 * exception object; typically it will be or contain an integer,
260 * because Perl's internals use integers to track exception types:
261 * extern "C" { static void thrower(int i) { throw i; } }
263 * Then (as shown below) the author needs to use, not the simple
264 * JMPENV_PUSH, but several of its constitutent macros, to arrange for
265 * the Perl internals to call thrower() rather than longjmp() to
269 * JMPENV_PUSH_INIT(thrower);
271 * ... stuff that may throw exceptions ...
273 * catch (int why) { // or whatever matches thrower()
277 * ... // handle various Perl exception codes
280 * JMPENV_POP; // don't forget this!
284 * Function that catches/throws, and its callback for the
285 * body of protected processing.
287 typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list);
288 typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ volatile JMPENV *pcur_env,
289 int *, protect_body_t, ...);
291 #define dJMPENV JMPENV cur_env; \
292 volatile JMPENV *pcur_env = ((cur_env.je_noset = 0),&cur_env)
294 #define JMPENV_PUSH_INIT_ENV(ce,THROWFUNC) \
296 (ce).je_throw = (THROWFUNC); \
298 (ce).je_mustcatch = FALSE; \
299 (ce).je_prev = PL_top_env; \
300 PL_top_env = &(ce); \
304 #define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(*(JMPENV*)pcur_env,THROWFUNC)
306 #define JMPENV_POST_CATCH_ENV(ce) \
309 PL_top_env = &(ce); \
312 #define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(*(JMPENV*)pcur_env)
314 #define JMPENV_PUSH_ENV(ce,v) \
316 if (!(ce).je_noset) { \
317 DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
319 JMPENV_PUSH_INIT_ENV(ce,NULL); \
320 EXCEPT_SET_ENV(ce,PerlProc_setjmp((ce).je_buf, SCOPE_SAVES_SIGNAL_MASK));\
324 EXCEPT_SET_ENV(ce,0); \
325 JMPENV_POST_CATCH_ENV(ce); \
326 (v) = EXCEPT_GET_ENV(ce); \
329 #define JMPENV_PUSH(v) JMPENV_PUSH_ENV(*(JMPENV*)pcur_env,v)
331 #define JMPENV_POP_ENV(ce) \
333 if (PL_top_env == &(ce)) \
334 PL_top_env = (ce).je_prev; \
337 #define JMPENV_POP JMPENV_POP_ENV(*(JMPENV*)pcur_env)
339 #define JMPENV_JUMP(v) \
342 if (PL_top_env->je_prev) { \
343 if (PL_top_env->je_throw) \
344 PL_top_env->je_throw(v); \
346 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
349 PerlProc_exit(STATUS_NATIVE_EXPORT); \
350 PerlIO_printf(Perl_error_log, "panic: top_env\n"); \
354 #define EXCEPT_GET_ENV(ce) ((ce).je_ret)
355 #define EXCEPT_GET EXCEPT_GET_ENV(*(JMPENV*)pcur_env)
356 #define EXCEPT_SET_ENV(ce,v) ((ce).je_ret = (v))
357 #define EXCEPT_SET(v) EXCEPT_SET_ENV(*(JMPENV*)pcur_env,v)
359 #else /* !PERL_FLEXIBLE_EXCEPTIONS */
361 #define dJMPENV JMPENV cur_env
363 #define JMPENV_PUSH(v) \
365 DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
366 &cur_env, PL_top_env)); \
367 cur_env.je_prev = PL_top_env; \
369 cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
371 PL_top_env = &cur_env; \
372 cur_env.je_mustcatch = FALSE; \
373 (v) = cur_env.je_ret; \
377 STMT_START { PL_top_env = cur_env.je_prev; } STMT_END
379 #define JMPENV_JUMP(v) \
382 if (PL_top_env->je_prev) \
383 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
385 PerlProc_exit(STATUS_NATIVE_EXPORT); \
386 PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
390 #endif /* PERL_FLEXIBLE_EXCEPTIONS */
392 #define CATCH_GET (PL_top_env->je_mustcatch)
393 #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))