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1 /**********************************************************************
2
3 vm_eval.c -
4
5 $Author: nobu $
6 created at: Sat May 24 16:02:32 JST 2008
7
8 Copyright (C) 1993-2007 Yukihiro Matsumoto
9 Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
10 Copyright (C) 2000 Information-technology Promotion Agency, Japan
11
12 **********************************************************************/
13
14 #include "ruby/ruby.h"
15 #include "ruby/node.h"
16 #include "ruby/st.h"
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17 #include "vm.h"
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18 #include "objc.h"
19 #include "id.h"
20
21 #include "vm_method.c"
22
23 static inline VALUE
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24 rb_call(VALUE recv, ID mid, int argc, const VALUE *argv, int scope,
25 bool pass_current_block)
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26 {
27 SEL sel;
28 if (mid == ID_ALLOCATOR) {
29 sel = selAlloc;
30 }
31 else {
32 const char *midstr = rb_id2name(mid);
33 if (argc > 0 && midstr[strlen(midstr) - 1] != ':') {
34 char buf[100];
35 snprintf(buf, sizeof buf, "%s:", midstr);
36 sel = sel_registerName(buf);
37 }
38 else {
39 sel = sel_registerName(midstr);
40 }
41 }
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42
43 void *cache = rb_vm_get_call_cache(sel);
44 rb_vm_block_t *block = pass_current_block ? rb_vm_current_block() : NULL;
45 return rb_vm_call_with_cache2(cache, block, recv, CLASS_OF(recv),
46 sel, argc, argv);
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47 }
48
49 /*
50 * call-seq:
51 * obj.method_missing(symbol [, *args] ) => result
52 *
53 * Invoked by Ruby when <i>obj</i> is sent a message it cannot handle.
54 * <i>symbol</i> is the symbol for the method called, and <i>args</i>
55 * are any arguments that were passed to it. By default, the interpreter
56 * raises an error when this method is called. However, it is possible
57 * to override the method to provide more dynamic behavior.
58 * If it is decided that a particular method should not be handled, then
59 * <i>super</i> should be called, so that ancestors can pick up the
60 * missing method.
61 * The example below creates
62 * a class <code>Roman</code>, which responds to methods with names
63 * consisting of roman numerals, returning the corresponding integer
64 * values.
65 *
66 * class Roman
67 * def romanToInt(str)
68 * # ...
69 * end
70 * def method_missing(methId)
71 * str = methId.id2name
72 * romanToInt(str)
73 * end
74 * end
75 *
76 * r = Roman.new
77 * r.iv #=> 4
78 * r.xxiii #=> 23
79 * r.mm #=> 2000
80 */
81
82 static VALUE
83 rb_method_missing(VALUE obj, SEL sel, int argc, const VALUE *argv)
84 {
85 return rb_vm_method_missing(obj, argc, argv);
86 }
87
88 VALUE
89 rb_apply(VALUE recv, ID mid, VALUE args)
90 {
91 int argc;
92 VALUE *argv;
93
94 argc = RARRAY_LEN(args); /* Assigns LONG, but argc is INT */
95 argv = ALLOCA_N(VALUE, argc);
96 MEMCPY(argv, RARRAY_PTR(args), VALUE, argc);
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97 return rb_call(recv, mid, argc, argv, CALL_FCALL, false);
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98 }
99
100 VALUE
101 rb_funcall(VALUE recv, ID mid, int n, ...)
102 {
103 VALUE *argv;
104 va_list ar;
105 va_start(ar, n);
106
107 if (n > 0) {
108 long i;
109
110 argv = ALLOCA_N(VALUE, n);
111
112 for (i = 0; i < n; i++) {
113 argv[i] = va_arg(ar, VALUE);
114 }
115 va_end(ar);
116 }
117 else {
118 argv = 0;
119 }
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120 return rb_call(recv, mid, n, argv, CALL_FCALL, false);
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121 }
122
123 VALUE
124 rb_funcall2(VALUE recv, ID mid, int argc, const VALUE *argv)
125 {
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126 return rb_call(recv, mid, argc, argv, CALL_FCALL, false);
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127 }
128
129 VALUE
130 rb_funcall3(VALUE recv, ID mid, int argc, const VALUE *argv)
131 {
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132 return rb_call(recv, mid, argc, argv, CALL_PUBLIC, false);
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133 }
134
135 static VALUE
136 send_internal(int argc, VALUE *argv, VALUE recv, int scope)
137 {
138 VALUE vid;
139
140 if (argc == 0) {
141 rb_raise(rb_eArgError, "no method name given");
142 }
143
144 vid = *argv++; argc--;
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145 return rb_call(recv, rb_to_id(vid), argc, argv, scope, true);
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146 }
147
148 /*
149 * call-seq:
150 * obj.send(symbol [, args...]) => obj
151 * obj.__send__(symbol [, args...]) => obj
152 *
153 * Invokes the method identified by _symbol_, passing it any
154 * arguments specified. You can use <code>__send__</code> if the name
155 * +send+ clashes with an existing method in _obj_.
156 *
157 * class Klass
158 * def hello(*args)
159 * "Hello " + args.join(' ')
160 * end
161 * end
162 * k = Klass.new
163 * k.send :hello, "gentle", "readers" #=> "Hello gentle readers"
164 */
165
166 static VALUE
167 rb_f_send(VALUE recv, SEL sel, int argc, VALUE *argv)
168 {
169 return send_internal(argc, argv, recv, NOEX_NOSUPER | NOEX_PRIVATE);
170 }
171
172 /*
173 * call-seq:
174 * obj.public_send(symbol [, args...]) => obj
175 *
176 * Invokes the method identified by _symbol_, passing it any
177 * arguments specified. Unlike send, public_send calls public
178 * methods only.
179 *
180 * 1.public_send(:puts, "hello") # causes NoMethodError
181 */
182
183 static VALUE
184 rb_f_public_send(VALUE recv, SEL sel, int argc, VALUE *argv)
185 {
186 return send_internal(argc, argv, recv, NOEX_PUBLIC);
187 }
188
189 /* yield */
190
191 static inline VALUE
192 rb_yield_0(int argc, const VALUE * argv)
193 {
194 return rb_vm_yield(argc, argv);
195 }
196
197 VALUE
198 rb_yield(VALUE val)
199 {
200 if (val == Qundef) {
201 return rb_yield_0(0, 0);
202 }
203 else {
204 return rb_yield_0(1, &val);
205 }
206 }
207
208 VALUE
209 rb_yield_values(int n, ...)
210 {
211 if (n == 0) {
212 return rb_yield_0(0, 0);
213 }
214 else {
215 int i;
216 VALUE *argv;
217 va_list args;
218 argv = ALLOCA_N(VALUE, n);
219
220 va_start(args, n);
221 for (i=0; i<n; i++) {
222 argv[i] = va_arg(args, VALUE);
223 }
224 va_end(args);
225
226 return rb_yield_0(n, argv);
227 }
228 }
229
230 VALUE
231 rb_yield_values2(int argc, const VALUE *argv)
232 {
233 return rb_yield_0(argc, argv);
234 }
235
236 VALUE
237 rb_yield_splat(VALUE values)
238 {
239 VALUE tmp = rb_check_array_type(values);
240 volatile VALUE v;
241 if (NIL_P(tmp)) {
242 rb_raise(rb_eArgError, "not an array");
243 }
244 v = rb_yield_0(RARRAY_LEN(tmp), RARRAY_PTR(tmp));
245 return v;
246 }
247
248 static VALUE
249 loop_i(void)
250 {
251 for (;;) {
252 rb_yield(Qundef);
253 RETURN_IF_BROKEN();
254 }
255 return Qnil;
256 }
257
258 /*
259 * call-seq:
260 * loop {|| block }
261 *
262 * Repeatedly executes the block.
263 *
264 * loop do
265 * print "Input: "
266 * line = gets
267 * break if !line or line =~ /^qQ/
268 * # ...
269 * end
270 *
271 * StopIteration raised in the block breaks the loop.
272 */
273
274 static VALUE
275 rb_f_loop(VALUE klass, SEL sel)
276 {
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277 return rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
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278 }
279
280 VALUE
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281 rb_objc_block_call(VALUE obj, SEL sel, void *cache, int argc, VALUE *argv,
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282 VALUE (*bl_proc) (ANYARGS), VALUE data2)
283 {
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284 rb_vm_block_t *b = rb_vm_create_block((IMP)bl_proc, obj, data2);
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285 if (cache == NULL) {
286 cache = rb_vm_get_call_cache(sel);
287 }
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288 return rb_vm_call_with_cache2(cache, b, obj, 0, sel, argc, argv);
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289 }
290
291 VALUE
292 rb_block_call(VALUE obj, ID mid, int argc, VALUE *argv,
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293 VALUE (*bl_proc) (ANYARGS), VALUE data2)
294 {
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295 SEL sel;
296 if (argc == 0) {
297 sel = sel_registerName(rb_id2name(mid));
298 }
299 else {
300 char buf[100];
301 snprintf(buf, sizeof buf, "%s:", rb_id2name(mid));
302 sel = sel_registerName(buf);
303 }
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304 return rb_objc_block_call(obj, sel, NULL, argc, argv, bl_proc, data2);
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305 }
306
307 VALUE
308 rb_each(VALUE obj)
309 {
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310 return rb_call(obj, idEach, 0, 0, CALL_FCALL, false);
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311 }
312
313 static VALUE
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314 eval_string(VALUE self, VALUE klass, VALUE src, VALUE scope, const char *file,
315 const int line)
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316 {
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317 rb_vm_binding_t *b = NULL;
318 if (scope != Qnil) {
319 if (!rb_obj_is_kind_of(scope, rb_cBinding)) {
320 rb_raise(rb_eTypeError, "wrong argument type %s (expected Binding)",
321 rb_obj_classname(scope));
322 }
323 b = (rb_vm_binding_t *)DATA_PTR(scope);
324 }
325
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326 bool old_parse_in_eval = rb_vm_parse_in_eval();
327 rb_vm_set_parse_in_eval(true);
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328 if (b != NULL) {
329 // Binding must be added because the parser needs it.
330 rb_vm_add_binding(b);
331 }
332
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333 NODE *node = rb_compile_string(file, src, line);
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334
335 if (b != NULL) {
336 // We remove the binding now but we still pass it to the VM, which
337 // will use it for compilation.
338 rb_vm_pop_binding();
339 }
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340 rb_vm_set_parse_in_eval(old_parse_in_eval);
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341
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342 if (node == NULL) {
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343 VALUE exc = rb_vm_current_exception();
344 if (exc != Qnil) {
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345 rb_vm_raise_current_exception();
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346 }
347 else {
348 rb_raise(rb_eSyntaxError, "compile error");
349 }
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350 }
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351
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352 return rb_vm_run_under(klass, self, file, node, b, true);
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353 }
354
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355 static VALUE
356 specific_eval(int argc, VALUE *argv, VALUE klass, VALUE self)
357 {
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358 VALUE retval;
359
360 // XXX: not exception-safe
361 const long old_version = RCLASS_VERSION(klass);
362
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363 if (rb_block_given_p()) {
364 if (argc > 0) {
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365 rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)",
366 argc);
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367 }
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368 rb_vm_set_current_scope(klass, SCOPE_PUBLIC);
369 retval = rb_vm_yield_under(klass, self, 0, NULL);
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370 }
371 else {
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372 const char *file = "(eval)";
373 int line = 1;
374
375 if (argc == 0) {
376 rb_raise(rb_eArgError, "block not supplied");
377 }
378 if (rb_safe_level() >= 4) {
379 StringValue(argv[0]);
380 }
381 else {
382 SafeStringValue(argv[0]);
383 }
384 if (argc > 3) {
385 const char *name = rb_id2name(rb_frame_callee());
386 rb_raise(rb_eArgError,
387 "wrong number of arguments: %s(src) or %s{..}",
388 name, name);
389 }
390 if (argc > 2) {
391 line = NUM2INT(argv[2]);
392 }
393 if (argc > 1) {
394 file = StringValuePtr(argv[1]);
395 }
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396 rb_vm_set_current_scope(klass, SCOPE_PUBLIC);
397 retval = eval_string(self, klass, argv[0], Qnil, file, line);
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398 }
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399
400 RCLASS_SET_VERSION(klass, old_version);
401
402 return retval;
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403 }
404
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405 /*
406 * call-seq:
407 * eval(string [, binding [, filename [,lineno]]]) => obj
408 *
409 * Evaluates the Ruby expression(s) in <em>string</em>. If
410 * <em>binding</em> is given, the evaluation is performed in its
411 * context. The binding may be a <code>Binding</code> object or a
412 * <code>Proc</code> object. If the optional <em>filename</em> and
413 * <em>lineno</em> parameters are present, they will be used when
414 * reporting syntax errors.
415 *
416 * def getBinding(str)
417 * return binding
418 * end
419 * str = "hello"
420 * eval "str + ' Fred'" #=> "hello Fred"
421 * eval "str + ' Fred'", getBinding("bye") #=> "bye Fred"
422 */
423
424 VALUE
425 rb_f_eval(VALUE self, SEL sel, int argc, VALUE *argv)
426 {
427 VALUE src, scope, vfile, vline;
428 const char *file = "(eval)";
429 int line = 1;
430
431 rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
432 if (rb_safe_level() >= 4) {
433 StringValue(src);
434 if (!NIL_P(scope) && !OBJ_TAINTED(scope)) {
435 rb_raise(rb_eSecurityError,
436 "Insecure: can't modify trusted binding");
437 }
438 }
439 else {
440 SafeStringValue(src);
441 }
442 if (argc >= 3) {
443 StringValue(vfile);
444 }
445 if (argc >= 4) {
446 line = NUM2INT(vline);
447 }
448 if (!NIL_P(vfile)) {
449 file = RSTRING_PTR(vfile);
450 }
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451 VALUE klass;
452 switch (TYPE(self)) {
453 case T_CLASS:
454 case T_MODULE:
455 klass = self;
456 break;
457 default:
458 klass = 0;
459 break;
460 }
461 return eval_string(self, klass, src, scope, file, line);
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462 }
463
464 VALUE
465 rb_eval_string(const char *str)
466 {
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467 return eval_string(rb_vm_top_self(), 0, rb_str_new2(str), Qnil, "(eval)", 1);
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468 }
469
470 VALUE
471 rb_eval_cmd(VALUE cmd, VALUE arg, int level)
472 {
473 VALUE val = Qnil; /* OK */
474 volatile int safe = rb_safe_level();
475
476 if (OBJ_TAINTED(cmd)) {
477 level = 4;
478 }
479
480 if (TYPE(cmd) != T_STRING) {
481 rb_set_safe_level_force(level);
482 val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LEN(arg),
483 RARRAY_PTR(arg));
484 rb_set_safe_level_force(safe);
485 return val;
486 }
487
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488 val = eval_string(0, rb_vm_top_self(), cmd, Qnil, 0, 0);
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489 rb_set_safe_level_force(safe);
490 return val;
491 }
492
493 /*
494 * call-seq:
495 * obj.instance_eval(string [, filename [, lineno]] ) => obj
496 * obj.instance_eval {| | block } => obj
497 *
498 * Evaluates a string containing Ruby source code, or the given block,
499 * within the context of the receiver (_obj_). In order to set the
500 * context, the variable +self+ is set to _obj_ while
501 * the code is executing, giving the code access to _obj_'s
502 * instance variables. In the version of <code>instance_eval</code>
503 * that takes a +String+, the optional second and third
504 * parameters supply a filename and starting line number that are used
505 * when reporting compilation errors.
506 *
507 * class KlassWithSecret
508 * def initialize
509 * @secret = 99
510 * end
511 * end
512 * k = KlassWithSecret.new
513 * k.instance_eval { @secret } #=> 99
514 */
515
516 static VALUE
517 rb_obj_instance_eval(VALUE self, SEL sel, int argc, VALUE *argv)
518 {
519 VALUE klass;
520
521 if (SPECIAL_CONST_P(self)) {
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522 klass = 0;
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523 }
524 else {
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525 klass = rb_singleton_class(self);
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526 }
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527 return specific_eval(argc, argv, klass, self);
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528 }
529
530 /*
531 * call-seq:
532 * obj.instance_exec(arg...) {|var...| block } => obj
533 *
534 * Executes the given block within the context of the receiver
535 * (_obj_). In order to set the context, the variable +self+ is set
536 * to _obj_ while the code is executing, giving the code access to
537 * _obj_'s instance variables. Arguments are passed as block parameters.
538 *
539 * class KlassWithSecret
540 * def initialize
541 * @secret = 99
542 * end
543 * end
544 * k = KlassWithSecret.new
545 * k.instance_exec(5) {|x| @secret+x } #=> 104
546 */
547
548 static VALUE
549 rb_obj_instance_exec(VALUE self, SEL sel, int argc, VALUE *argv)
550 {
551 VALUE klass;
552
553 if (SPECIAL_CONST_P(self)) {
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554 klass = 0;
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555 }
556 else {
557 klass = rb_singleton_class(self);
558 }
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559 if (!rb_block_given_p()) {
560 rb_raise(rb_eLocalJumpError, "no block given");
561 }
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562 return rb_vm_yield_under(klass, self, argc, argv);
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563 }
564
565 /*
566 * call-seq:
567 * mod.class_eval(string [, filename [, lineno]]) => obj
568 * mod.module_eval {|| block } => obj
569 *
570 * Evaluates the string or block in the context of _mod_. This can
571 * be used to add methods to a class. <code>module_eval</code> returns
572 * the result of evaluating its argument. The optional _filename_
573 * and _lineno_ parameters set the text for error messages.
574 *
575 * class Thing
576 * end
577 * a = %q{def hello() "Hello there!" end}
578 * Thing.module_eval(a)
579 * puts Thing.new.hello()
580 * Thing.module_eval("invalid code", "dummy", 123)
581 *
582 * <em>produces:</em>
583 *
584 * Hello there!
585 * dummy:123:in `module_eval': undefined local variable
586 * or method `code' for Thing:Class
587 */
588
589 VALUE
590 rb_mod_module_eval(VALUE mod, SEL sel, int argc, VALUE *argv)
591 {
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592 return specific_eval(argc, argv, mod, mod);
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593 }
594
595 /*
596 * call-seq:
597 * mod.module_exec(arg...) {|var...| block } => obj
598 * mod.class_exec(arg...) {|var...| block } => obj
599 *
600 * Evaluates the given block in the context of the class/module.
601 * The method defined in the block will belong to the receiver.
602 *
603 * class Thing
604 * end
605 * Thing.class_exec{
606 * def hello() "Hello there!" end
607 * }
608 * puts Thing.new.hello()
609 *
610 * <em>produces:</em>
611 *
612 * Hello there!
613 */
614
615 VALUE
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616 rb_mod_module_exec(VALUE mod, SEL sel, int argc, VALUE *argv)
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617 {
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618 return rb_vm_yield_under(mod, mod, argc, argv);
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619 }
620
621 /*
622 * call-seq:
623 * throw(symbol [, obj])
624 *
625 * Transfers control to the end of the active +catch+ block
626 * waiting for _symbol_. Raises +NameError+ if there
627 * is no +catch+ block for the symbol. The optional second
628 * parameter supplies a return value for the +catch+ block,
629 * which otherwise defaults to +nil+. For examples, see
630 * <code>Kernel::catch</code>.
631 */
632
633 static VALUE
634 rb_f_throw(VALUE rcv, SEL sel, int argc, VALUE *argv)
635 {
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636 VALUE tag, value;
637
638 rb_scan_args(argc, argv, "11", &tag, &value);
639
640 return rb_vm_throw(tag, value);
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641 }
642
643 void
644 rb_throw(const char *tag, VALUE val)
645 {
646 VALUE argv[2];
647
648 argv[0] = ID2SYM(rb_intern(tag));
649 argv[1] = val;
650 rb_f_throw(Qnil, 0, 2, argv);
651 }
652
653 void
654 rb_throw_obj(VALUE tag, VALUE val)
655 {
656 VALUE argv[2];
657
658 argv[0] = tag;
659 argv[1] = val;
660 rb_f_throw(Qnil, 0, 2, argv);
661 }
662
663 /*
664 * call-seq:
665 * catch(symbol) {| | block } > obj
666 *
667 * +catch+ executes its block. If a +throw+ is
668 * executed, Ruby searches up its stack for a +catch+ block
669 * with a tag corresponding to the +throw+'s
670 * _symbol_. If found, that block is terminated, and
671 * +catch+ returns the value given to +throw+. If
672 * +throw+ is not called, the block terminates normally, and
673 * the value of +catch+ is the value of the last expression
674 * evaluated. +catch+ expressions may be nested, and the
675 * +throw+ call need not be in lexical scope.
676 *
677 * def routine(n)
678 * puts n
679 * throw :done if n <= 0
680 * routine(n-1)
681 * end
682 *
683 *
684 * catch(:done) { routine(3) }
685 *
686 * <em>produces:</em>
687 *
688 * 3
689 * 2
690 * 1
691 * 0
692 */
693
694 static VALUE
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695 rb_f_catch(VALUE rcv, SEL sel, VALUE tag)
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696 {
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697 return rb_vm_catch(tag);
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698 }
699
700 /*
701 * call-seq:
702 * caller(start=1) => array
703 *
704 * Returns the current execution stack---an array containing strings in
705 * the form ``<em>file:line</em>'' or ``<em>file:line: in
706 * `method'</em>''. The optional _start_ parameter
707 * determines the number of initial stack entries to omit from the
708 * result.
709 *
710 * def a(skip)
711 * caller(skip)
712 * end
713 * def b(skip)
714 * a(skip)
715 * end
716 * def c(skip)
717 * b(skip)
718 * end
719 * c(0) #=> ["prog:2:in `a'", "prog:5:in `b'", "prog:8:in `c'", "prog:10"]
720 * c(1) #=> ["prog:5:in `b'", "prog:8:in `c'", "prog:11"]
721 * c(2) #=> ["prog:8:in `c'", "prog:12"]
722 * c(3) #=> ["prog:13"]
723 */
724
725 static VALUE
726 rb_f_caller(VALUE klass, SEL sel, int argc, VALUE *argv)
727 {
728 VALUE level;
729 int lev;
730
731 rb_scan_args(argc, argv, "01", &level);
732
733 if (NIL_P(level)) {
734 lev = 1;
735 }
736 else {
737 lev = NUM2INT(level);
738 }
739
740 if (lev < 0) {
741 rb_raise(rb_eArgError, "negative level (%d)", lev);
742 }
743
744 return rb_vm_backtrace(lev);
745 }
746
747 void
748 rb_backtrace(void)
749 {
750 long i, count;
751 VALUE ary;
752
753 ary = rb_vm_backtrace(-1);
754 for (i = 0, count = RARRAY_LEN(ary); i < count; i++) {
755 printf("\tfrom %s\n", RSTRING_PTR(RARRAY_AT(ary, i)));
756 }
757 }
758
759 VALUE
760 rb_make_backtrace(void)
761 {
762 return rb_vm_backtrace(-1);
763 }
764
765 void
766 Init_vm_eval(void)
767 {
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768 rb_objc_define_method(rb_mKernel, "catch", rb_f_catch, 1);
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769 rb_objc_define_method(rb_mKernel, "throw", rb_f_throw, -1);
770
771 rb_objc_define_method(rb_mKernel, "loop", rb_f_loop, 0);
772
773 rb_objc_define_method(rb_cNSObject, "instance_eval", rb_obj_instance_eval, -1);
774 rb_objc_define_method(rb_cNSObject, "instance_exec", rb_obj_instance_exec, -1);
775 rb_objc_define_private_method(rb_cNSObject, "method_missing", rb_method_missing, -1);
776 rb_objc_define_method(rb_cNSObject, "__send__", rb_f_send, -1);
777
778 rb_objc_define_method(rb_cBasicObject, "instance_eval", rb_obj_instance_eval, -1);
779 rb_objc_define_method(rb_cBasicObject, "instance_exec", rb_obj_instance_exec, -1);
780 rb_objc_define_private_method(rb_cBasicObject, "method_missing", rb_method_missing, -1);
781 rb_objc_define_method(rb_cBasicObject, "__send__", rb_f_send, -1);
782
783 rb_objc_define_method(rb_mKernel, "send", rb_f_send, -1);
784 rb_objc_define_method(rb_mKernel, "public_send", rb_f_public_send, -1);
785
786 rb_objc_define_method(rb_cModule, "module_exec", rb_mod_module_exec, -1);
787 rb_objc_define_method(rb_cModule, "class_exec", rb_mod_module_exec, -1);
788
789 rb_objc_define_method(rb_mKernel, "caller", rb_f_caller, -1);
790 }
791
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