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misc tweaks
[perl5.git] / scope.h
CommitLineData
b9d12d37
GS
1#define SAVEt_ITEM 0
2#define SAVEt_SV 1
3#define SAVEt_AV 2
4#define SAVEt_HV 3
5#define SAVEt_INT 4
6#define SAVEt_LONG 5
7#define SAVEt_I32 6
8#define SAVEt_IV 7
9#define SAVEt_SPTR 8
10#define SAVEt_APTR 9
11#define SAVEt_HPTR 10
12#define SAVEt_PPTR 11
13#define SAVEt_NSTAB 12
14#define SAVEt_SVREF 13
15#define SAVEt_GP 14
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
24#define SAVEt_I16 23
25#define SAVEt_AELEM 24
26#define SAVEt_HELEM 25
27#define SAVEt_OP 26
28#define SAVEt_HINTS 27
29#define SAVEt_ALLOC 28
30#define SAVEt_GENERIC_SVREF 29
c76ac1ee 31#define SAVEt_DESTRUCTOR_X 30
79072805 32
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33#define SSCHECK(need) if (PL_savestack_ix + need > PL_savestack_max) savestack_grow()
34#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
35#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
36#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
37#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
38#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
c76ac1ee 39#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))
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NIS
40#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
41#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
42#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
43#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
44#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
c76ac1ee 45#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)
8990e307 46
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NIS
47#define SAVETMPS save_int((int*)&PL_tmps_floor), PL_tmps_floor = PL_tmps_ix
48#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()
a0d0e21e 49
f46d017c
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50#ifdef DEBUGGING
51#define ENTER \
52 STMT_START { \
53 push_scope(); \
cea2e8a9 54 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "ENTER scope %ld at %s:%d\n", \
3280af22 55 PL_scopestack_ix, __FILE__, __LINE__))); \
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56 } STMT_END
57#define LEAVE \
58 STMT_START { \
cea2e8a9 59 DEBUG_l(WITH_THR(Perl_deb(aTHX_ "LEAVE scope %ld at %s:%d\n", \
3280af22 60 PL_scopestack_ix, __FILE__, __LINE__))); \
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61 pop_scope(); \
62 } STMT_END
63#else
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64#define ENTER push_scope()
65#define LEAVE pop_scope()
f46d017c 66#endif
3280af22 67#define LEAVE_SCOPE(old) if (PL_savestack_ix > old) leave_scope(old)
a0d0e21e 68
55497cff 69/*
b9d12d37 70 * Not using SOFT_CAST on SAVESPTR, SAVEGENERICSV and SAVEFREESV
55497cff
PP
71 * because these are used for several kinds of pointer values
72 */
4fdae800
PP
73#define SAVEI16(i) save_I16(SOFT_CAST(I16*)&(i))
74#define SAVEI32(i) save_I32(SOFT_CAST(I32*)&(i))
75#define SAVEINT(i) save_int(SOFT_CAST(int*)&(i))
76#define SAVEIV(i) save_iv(SOFT_CAST(IV*)&(i))
77#define SAVELONG(l) save_long(SOFT_CAST(long*)&(l))
55497cff
PP
78#define SAVESPTR(s) save_sptr((SV**)&(s))
79#define SAVEPPTR(s) save_pptr(SOFT_CAST(char**)&(s))
80#define SAVEFREESV(s) save_freesv((SV*)(s))
81#define SAVEFREEOP(o) save_freeop(SOFT_CAST(OP*)(o))
82#define SAVEFREEPV(p) save_freepv(SOFT_CAST(char*)(p))
83#define SAVECLEARSV(sv) save_clearsv(SOFT_CAST(SV**)&(sv))
b9d12d37 84#define SAVEGENERICSV(s) save_generic_svref((SV**)&(s))
55497cff
PP
85#define SAVEDELETE(h,k,l) \
86 save_delete(SOFT_CAST(HV*)(h), SOFT_CAST(char*)(k), (I32)(l))
87#define SAVEDESTRUCTOR(f,p) \
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88 save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), SOFT_CAST(void*)(p))
89
90#define SAVEDESTRUCTOR_X(f,p) \
91 save_destructor_x((DESTRUCTORFUNC_t)(f), SOFT_CAST(void*)(p))
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92
93#define SAVESTACK_POS() \
94 STMT_START { \
95 SSCHECK(2); \
3280af22 96 SSPUSHINT(PL_stack_sp - PL_stack_base); \
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97 SSPUSHINT(SAVEt_STACK_POS); \
98 } STMT_END
99
462e5cf6 100#define SAVEOP() save_op()
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101
102#define SAVEHINTS() \
103 STMT_START { \
3280af22 104 if (PL_hints & HINT_LOCALIZE_HH) \
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105 save_hints(); \
106 else { \
107 SSCHECK(2); \
3280af22 108 SSPUSHINT(PL_hints); \
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109 SSPUSHINT(SAVEt_HINTS); \
110 } \
111 } STMT_END
a9332b4a 112
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113/* SSNEW() temporarily allocates a specified number of bytes of data on the
114 * savestack. It returns an integer index into the savestack, because a
115 * pointer would get broken if the savestack is moved on reallocation.
116 * SSNEWa() works like SSNEW(), but also aligns the data to the specified
117 * number of bytes. MEM_ALIGNBYTES is perhaps the most useful. The
118 * alignment will be preserved therough savestack reallocation *only* if
119 * realloc returns data aligned to a size divisible by `align'!
120 *
121 * SSPTR() converts the index returned by SSNEW/SSNEWa() into a pointer.
122 */
123
124#define SSNEW(size) save_alloc(size, 0)
125#define SSNEWa(size,align) save_alloc(size, \
126 (align - ((int)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
127
128#define SSPTR(off,type) ((type) ((char*)PL_savestack + off))
129
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PP
130/* A jmpenv packages the state required to perform a proper non-local jump.
131 * Note that there is a start_env initialized when perl starts, and top_env
132 * points to this initially, so top_env should always be non-null.
133 *
134 * Existence of a non-null top_env->je_prev implies it is valid to call
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135 * longjmp() at that runlevel (we make sure start_env.je_prev is always
136 * null to ensure this).
54310121
PP
137 *
138 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
139 * establish a local jmpenv to handle exception traps. Care must be taken
140 * to restore the previous value of je_mustcatch before exiting the
141 * stack frame iff JMPENV_PUSH was not called in that stack frame.
6224f72b 142 * GSAR 97-03-27
54310121
PP
143 */
144
145struct jmpenv {
146 struct jmpenv * je_prev;
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147 Sigjmp_buf je_buf; /* only for use if !je_throw */
148 int je_ret; /* last exception thrown */
149 bool je_mustcatch; /* need to call longjmp()? */
150 void (*je_throw)(int v); /* last for bincompat */
1163b5c4 151};
1163b5c4 152
6224f72b 153typedef struct jmpenv JMPENV;
1163b5c4 154
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CS
155/*
156 * Function that catches/throws, and its callback for the
157 * body of protected processing.
158 */
cea2e8a9
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159typedef void *(CPERLscope(*protect_body_t)) (pTHX_ va_list);
160typedef void *(CPERLscope(*protect_proc_t)) (pTHX_ int *, protect_body_t, ...);
312caa8e
CS
161
162/*
163 * How to build the first jmpenv.
164 *
165 * top_env needs to be non-zero. It points to an area
166 * in which longjmp() stuff is stored, as C callstack
167 * info there at least is thread specific this has to
168 * be per-thread. Otherwise a 'die' in a thread gives
169 * that thread the C stack of last thread to do an eval {}!
170 */
171
172#define JMPENV_BOOTSTRAP \
173 STMT_START { \
174 PL_start_env.je_prev = NULL; \
175 PL_start_env.je_throw = NULL; \
176 PL_start_env.je_ret = -1; \
177 PL_start_env.je_mustcatch = TRUE; \
178 PL_top_env = &PL_start_env; \
179 } STMT_END
180
462e5cf6 181#ifdef OP_IN_REGISTER
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182#define OP_REG_TO_MEM PL_opsave = op
183#define OP_MEM_TO_REG op = PL_opsave
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MB
184#else
185#define OP_REG_TO_MEM NOOP
186#define OP_MEM_TO_REG NOOP
187#endif
188
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189/*
190 * These exception-handling macros are split up to
191 * ease integration with C++ exceptions.
192 *
193 * To use C++ try+catch to catch Perl exceptions, an extension author
194 * needs to first write an extern "C" function to throw an appropriate
195 * exception object; typically it will be or contain an integer,
196 * because Perl's internals use integers to track exception types:
197 * extern "C" { static void thrower(int i) { throw i; } }
198 *
199 * Then (as shown below) the author needs to use, not the simple
200 * JMPENV_PUSH, but several of its constitutent macros, to arrange for
201 * the Perl internals to call thrower() rather than longjmp() to
202 * report exceptions:
203 *
204 * dJMPENV;
205 * JMPENV_PUSH_INIT(thrower);
206 * try {
207 * ... stuff that may throw exceptions ...
208 * }
209 * catch (int why) { // or whatever matches thrower()
210 * JMPENV_POST_CATCH;
211 * EXCEPT_SET(why);
212 * switch (why) {
213 * ... // handle various Perl exception codes
214 * }
215 * }
216 * JMPENV_POP; // don't forget this!
217 */
218
6224f72b 219#define dJMPENV JMPENV cur_env
312caa8e 220
1d651c14 221#define JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC) \
6224f72b 222 STMT_START { \
312caa8e
CS
223 cur_env.je_throw = (THROWFUNC); \
224 cur_env.je_ret = -1; \
225 cur_env.je_mustcatch = FALSE; \
3280af22 226 cur_env.je_prev = PL_top_env; \
312caa8e 227 PL_top_env = &cur_env; \
6224f72b 228 OP_REG_TO_MEM; \
312caa8e 229 } STMT_END
1d651c14
VB
230
231#define JMPENV_PUSH_INIT(THROWFUNC) JMPENV_PUSH_INIT_ENV(cur_env,THROWFUNC)
232
233#define JMPENV_POST_CATCH_ENV(cur_env) \
312caa8e 234 STMT_START { \
6224f72b 235 OP_MEM_TO_REG; \
3280af22 236 PL_top_env = &cur_env; \
6224f72b 237 } STMT_END
312caa8e 238
1d651c14
VB
239#define JMPENV_POST_CATCH JMPENV_POST_CATCH_ENV(cur_env)
240
241
242#define JMPENV_PUSH_ENV(cur_env,v) \
312caa8e 243 STMT_START { \
1d651c14
VB
244 JMPENV_PUSH_INIT_ENV(cur_env,NULL); \
245 EXCEPT_SET_ENV(cur_env,PerlProc_setjmp(cur_env.je_buf, 1)); \
246 JMPENV_POST_CATCH_ENV(cur_env); \
247 (v) = EXCEPT_GET_ENV(cur_env); \
312caa8e
CS
248 } STMT_END
249
1d651c14
VB
250#define JMPENV_PUSH(v) JMPENV_PUSH_ENV(cur_env,v)
251
252#define JMPENV_POP_ENV(cur_env) \
3280af22 253 STMT_START { PL_top_env = cur_env.je_prev; } STMT_END
312caa8e 254
1d651c14
VB
255#define JMPENV_POP JMPENV_POP_ENV(cur_env)
256
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CS
257#define JMPENV_JUMP(v) \
258 STMT_START { \
462e5cf6 259 OP_REG_TO_MEM; \
312caa8e
CS
260 if (PL_top_env->je_prev) { \
261 if (PL_top_env->je_throw) \
262 PL_top_env->je_throw(v); \
263 else \
264 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
265 } \
6224f72b 266 if ((v) == 2) \
312caa8e 267 PerlProc_exit(STATUS_NATIVE_EXPORT); \
bf49b057 268 PerlIO_printf(Perl_error_log, "panic: top_env\n"); \
312caa8e 269 PerlProc_exit(1); \
22921e25 270 } STMT_END
312caa8e 271
1d651c14
VB
272#define EXCEPT_GET_ENV(cur_env) (cur_env.je_ret)
273#define EXCEPT_GET EXCEPT_GET_ENV(cur_env)
274#define EXCEPT_SET_ENV(cur_env,v) (cur_env.je_ret = (v))
275#define EXCEPT_SET(v) EXCEPT_SET_ENV(cur_env,v)
312caa8e 276
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NIS
277#define CATCH_GET (PL_top_env->je_mustcatch)
278#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))
6224f72b 279