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
32 #define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
33 #define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
34 #define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
35 #define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
36 #define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
37 #define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
38 #define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
39 #define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
40 #define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
41 #define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
42 #define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
44 #define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
45 #define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
51 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \
52 PL_scopestack_ix, __FILE__, __LINE__))); \
56 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \
57 PL_scopestack_ix, __FILE__, __LINE__))); \
61 #define ENTER push_scope()
62 #define LEAVE pop_scope()
64 #define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
67 * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
68 * because these are used for several kinds of pointer values
70 #define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i))
71 #define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i))
72 #define SAVEINT(i) save_int(SOFT_CAST(int*)&(i))
73 #define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i))
74 #define SAVELONG(l) save_long(SOFT_CAST(long*)&(l))
75 #define SAVESPTR(s) save_sptr((SV**)&(s))
76 #define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s))
77 #define SAVEFREESV(s) save_freesv((SV*)(s))
78 #define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o))
79 #define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p))
80 #define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv))
81 #define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
82 #define SAVEDELETE(h,k,l) \
83 save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l))
84 #define CALLDESTRUCTOR (*SSPOPDPTR)
85 #define SAVEDESTRUCTOR(f,p) \
86 save_destructor((DESTRUCTORFUNC_t)(FUNC_NAME_TO_PTR(f)), \
89 #define SAVESTACK_POS() \
92 SSPUSHINT(PL_stack_sp - PL_stack_base); \
93 SSPUSHINT(SAVEt_STACK_POS); \
96 #define SAVEOP() save_op()
100 if (PL_hints & HINT_LOCALIZE_HH) \
104 SSPUSHINT(PL_hints); \
105 SSPUSHINT(SAVEt_HINTS); \
109 /* SSNEW() temporarily allocates a specified number of bytes of data on the
110 * savestack. It returns an integer index into the savestack, because a
111 * pointer would get broken if the savestack is moved on reallocation.
112 * SSNEWa() works like SSNEW(), but also aligns the data to the specified
113 * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
114 * alignment will be preserved therough savestack reallocation *only* if
115 * realloc returns data aligned to a size divisible by `align'!
117 * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
120 #define SSNEW(size) save_alloc(size, 0)
121 #define SSNEWa(size,align) save_alloc(size, \
122 (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
124 #define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
126 /* A jmpenv packages the state required to perform a proper non-local jump.
127 * Note that there is a start_env initialized when perl starts, and top_env
128 * points to this initially, so top_env should always be non-null.
130 * Existence of a non-null top_env->je_prev implies it is valid to call
131 * longjmp() at that runlevel (we make sure start_env.je_prev is always
132 * null to ensure this).
134 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
135 * establish a local jmpenv to handle exception traps. Care must be taken
136 * to restore the previous value of je_mustcatch before exiting the
137 * stack frame iff JMPENV_PUSH was not called in that stack frame.
142 struct jmpenv * je_prev;
143 Sigjmp_buf je_buf; /* only for use if !je_throw */
144 int je_ret; /* last exception thrown */
145 bool je_mustcatch; /* need to call longjmp()? */
146 void (*je_throw)(int v); /* last for bincompat */
149 typedef struct jmpenv JMPENV;
152 * Function that catches/throws, and its callback for the
153 * body of protected processing.
155 typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list);
156 typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ int *, protect_body_t, ...);
159 * How to build the first jmpenv.
161 * top_env needs to be non-zero. It points to an area
162 * in which longjmp() stuff is stored, as C callstack
163 * info there at least is thread specific this has to
164 * be per-thread. Otherwise a 'die' in a thread gives
165 * that thread the C stack of last thread to do an eval {}!
168 #define JMPENV_BOOTSTRAP \
170 PL_start_env.je_prev = NULL; \
171 PL_start_env.je_throw = NULL; \
172 PL_start_env.je_ret = -1; \
173 PL_start_env.je_mustcatch = TRUE; \
174 PL_top_env = &PL_start_env; \
177 #ifdef OP_IN_REGISTER
178 #define OP_REG_TO_MEM PL_opsave = op
179 #define OP_MEM_TO_REG op = PL_opsave
181 #define OP_REG_TO_MEM NOOP
182 #define OP_MEM_TO_REG NOOP
186 * These exception-handling macros are split up to
187 * ease integration with C++ exceptions.
189 * To use C++ try+catch to catch Perl exceptions, an extension author
190 * needs to first write an extern "C" function to throw an appropriate
191 * exception object; typically it will be or contain an integer,
192 * because Perl's internals use integers to track exception types:
193 * extern "C" { static void thrower(int i) { throw i; } }
195 * Then (as shown below) the author needs to use, not the simple
196 * JMPENV_PUSH, but several of its constitutent macros, to arrange for
197 * the Perl internals to call thrower() rather than longjmp() to
201 * JMPENV_PUSH_INIT(thrower);
203 * ... stuff that may throw exceptions ...
205 * catch (int why) { // or whatever matches thrower()
209 * ... // handle various Perl exception codes
212 * JMPENV_POP; // don't forget this!
215 #define dJMPENV JMPENV cur_env
217 #define JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC) \
219 cur_env.je_throw = (THROWFUNC); \
220 cur_env.je_ret = -1; \
221 cur_env.je_mustcatch = FALSE; \
222 cur_env.je_prev = PL_top_env; \
223 PL_top_env = &cur_env; \
227 #define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC)
229 #define JMPENV_POST_CATCH_ENV(cur_env) \
232 PL_top_env = &cur_env; \
235 #define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(cur_env)
238 #define JMPENV_PUSH_ENV(cur_env,v) \
240 JMPENV_PUSH_INIT_ENV(cur_env,NULL); \
241 EXCEPT_SET_ENV(cur_env,PerlProc_setjmp(cur_env.je_buf, 1)); \
242 JMPENV_POST_CATCH_ENV(cur_env); \
243 (v) = EXCEPT_GET_ENV(cur_env); \
246 #define JMPENV_PUSH(v) JMPENV_PUSH_ENV(cur_env,v)
248 #define JMPENV_POP_ENV(cur_env) \
249 STMT_START { PL_top_env = cur_env.je_prev; } STMT_END
251 #define JMPENV_POP JMPENV_POP_ENV(cur_env)
253 #define JMPENV_JUMP(v) \
256 if (PL_top_env->je_prev) { \
257 if (PL_top_env->je_throw) \
258 PL_top_env->je_throw(v); \
260 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
263 PerlProc_exit(STATUS_NATIVE_EXPORT); \
264 PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
268 #define EXCEPT_GET_ENV(cur_env) (cur_env.je_ret)
269 #define EXCEPT_GET EXCEPT_GET_ENV(cur_env)
270 #define EXCEPT_SET_ENV(cur_env,v) (cur_env.je_ret = (v))
271 #define EXCEPT_SET(v) EXCEPT_SET_ENV(cur_env,v)
273 #define CATCH_GET (PL_top_env->je_mustcatch)
274 #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))