1: /*
2: +----------------------------------------------------------------------+
3: | Zend Engine |
4: +----------------------------------------------------------------------+
5: | Copyright (c) 1998-2013 Zend Technologies Ltd. (http://www.zend.com) |
6: +----------------------------------------------------------------------+
7: | This source file is subject to version 2.00 of the Zend license, |
8: | that is bundled with this package in the file LICENSE, and is |
9: | available through the world-wide-web at the following url: |
10: | http://www.zend.com/license/2_00.txt. |
11: | If you did not receive a copy of the Zend license and are unable to |
12: | obtain it through the world-wide-web, please send a note to |
13: | license@zend.com so we can mail you a copy immediately. |
14: +----------------------------------------------------------------------+
15: | Authors: Christian Seiler <chris_se@gmx.net> |
16: | Dmitry Stogov <dmitry@zend.com> |
17: | Marcus Boerger <helly@php.net> |
18: +----------------------------------------------------------------------+
19: */
20:
21: /* $Id: zend_closures.c,v 1.1.1.3 2013/07/22 01:32:15 misho Exp $ */
22:
23: #include "zend.h"
24: #include "zend_API.h"
25: #include "zend_closures.h"
26: #include "zend_exceptions.h"
27: #include "zend_interfaces.h"
28: #include "zend_objects.h"
29: #include "zend_objects_API.h"
30: #include "zend_globals.h"
31:
32: #define ZEND_CLOSURE_PRINT_NAME "Closure object"
33:
34: #define ZEND_CLOSURE_PROPERTY_ERROR() \
35: zend_error(E_RECOVERABLE_ERROR, "Closure object cannot have properties")
36:
37: typedef struct _zend_closure {
38: zend_object std;
39: zend_function func;
40: zval *this_ptr;
41: HashTable *debug_info;
42: } zend_closure;
43:
44: /* non-static since it needs to be referenced */
45: ZEND_API zend_class_entry *zend_ce_closure;
46: static zend_object_handlers closure_handlers;
47:
48: ZEND_METHOD(Closure, __invoke) /* {{{ */
49: {
50: zend_function *func = EG(current_execute_data)->function_state.function;
51: zval ***arguments;
52: zval *closure_result_ptr = NULL;
53:
54: arguments = emalloc(sizeof(zval**) * ZEND_NUM_ARGS());
55: if (zend_get_parameters_array_ex(ZEND_NUM_ARGS(), arguments) == FAILURE) {
56: efree(arguments);
57: zend_error(E_RECOVERABLE_ERROR, "Cannot get arguments for calling closure");
58: RETVAL_FALSE;
59: } else if (call_user_function_ex(CG(function_table), NULL, this_ptr, &closure_result_ptr, ZEND_NUM_ARGS(), arguments, 1, NULL TSRMLS_CC) == FAILURE) {
60: RETVAL_FALSE;
61: } else if (closure_result_ptr) {
62: if (Z_ISREF_P(closure_result_ptr) && return_value_ptr) {
63: if (return_value) {
64: zval_ptr_dtor(&return_value);
65: }
66: *return_value_ptr = closure_result_ptr;
67: } else {
68: RETVAL_ZVAL(closure_result_ptr, 1, 1);
69: }
70: }
71: efree(arguments);
72:
73: /* destruct the function also, then - we have allocated it in get_method */
74: efree((char*)func->internal_function.function_name);
75: efree(func);
76: }
77: /* }}} */
78:
79: /* {{{ proto Closure Closure::bind(Closure $old, object $to [, mixed $scope = "static" ] )
80: Create a closure from another one and bind to another object and scope */
81: ZEND_METHOD(Closure, bind)
82: {
83: zval *newthis, *zclosure, *scope_arg = NULL;
84: zend_closure *closure;
85: zend_class_entry *ce, **ce_p;
86:
87: if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "Oo!|z", &zclosure, zend_ce_closure, &newthis, &scope_arg) == FAILURE) {
88: RETURN_NULL();
89: }
90:
91: closure = (zend_closure *)zend_object_store_get_object(zclosure TSRMLS_CC);
92:
93: if ((newthis != NULL) && (closure->func.common.fn_flags & ZEND_ACC_STATIC)) {
94: zend_error(E_WARNING, "Cannot bind an instance to a static closure");
95: }
96:
97: if (scope_arg != NULL) { /* scope argument was given */
98: if (IS_ZEND_STD_OBJECT(*scope_arg)) {
99: ce = Z_OBJCE_P(scope_arg);
100: } else if (Z_TYPE_P(scope_arg) == IS_NULL) {
101: ce = NULL;
102: } else {
103: char *class_name;
104: int class_name_len;
105: zval tmp_zval;
106: INIT_ZVAL(tmp_zval);
107:
108: if (Z_TYPE_P(scope_arg) == IS_STRING) {
109: class_name = Z_STRVAL_P(scope_arg);
110: class_name_len = Z_STRLEN_P(scope_arg);
111: } else {
112: tmp_zval = *scope_arg;
113: zval_copy_ctor(&tmp_zval);
114: convert_to_string(&tmp_zval);
115: class_name = Z_STRVAL(tmp_zval);
116: class_name_len = Z_STRLEN(tmp_zval);
117: }
118:
119: if ((class_name_len == sizeof("static") - 1) &&
120: (memcmp("static", class_name, sizeof("static") - 1) == 0)) {
121: ce = closure->func.common.scope;
122: }
123: else if (zend_lookup_class_ex(class_name, class_name_len, NULL, 1, &ce_p TSRMLS_CC) == FAILURE) {
124: zend_error(E_WARNING, "Class '%s' not found", class_name);
125: zval_dtor(&tmp_zval);
126: RETURN_NULL();
127: } else {
128: ce = *ce_p;
129: }
130: zval_dtor(&tmp_zval);
131: }
132: } else { /* scope argument not given; do not change the scope by default */
133: ce = closure->func.common.scope;
134: }
135:
136: zend_create_closure(return_value, &closure->func, ce, newthis TSRMLS_CC);
137: }
138: /* }}} */
139:
140: static zend_function *zend_closure_get_constructor(zval *object TSRMLS_DC) /* {{{ */
141: {
142: zend_error(E_RECOVERABLE_ERROR, "Instantiation of 'Closure' is not allowed");
143: return NULL;
144: }
145: /* }}} */
146:
147: static int zend_closure_compare_objects(zval *o1, zval *o2 TSRMLS_DC) /* {{{ */
148: {
149: return (Z_OBJ_HANDLE_P(o1) != Z_OBJ_HANDLE_P(o2));
150: }
151: /* }}} */
152:
153: ZEND_API zend_function *zend_get_closure_invoke_method(zval *obj TSRMLS_DC) /* {{{ */
154: {
155: zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
156: zend_function *invoke = (zend_function*)emalloc(sizeof(zend_function));
157:
158: invoke->common = closure->func.common;
159: invoke->type = ZEND_INTERNAL_FUNCTION;
160: invoke->internal_function.fn_flags = ZEND_ACC_PUBLIC | ZEND_ACC_CALL_VIA_HANDLER | (closure->func.common.fn_flags & ZEND_ACC_RETURN_REFERENCE);
161: invoke->internal_function.handler = ZEND_MN(Closure___invoke);
162: invoke->internal_function.module = 0;
163: invoke->internal_function.scope = zend_ce_closure;
164: invoke->internal_function.function_name = estrndup(ZEND_INVOKE_FUNC_NAME, sizeof(ZEND_INVOKE_FUNC_NAME)-1);
165: return invoke;
166: }
167: /* }}} */
168:
169: ZEND_API const zend_function *zend_get_closure_method_def(zval *obj TSRMLS_DC) /* {{{ */
170: {
171: zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
172: return &closure->func;
173: }
174: /* }}} */
175:
176: ZEND_API zval* zend_get_closure_this_ptr(zval *obj TSRMLS_DC) /* {{{ */
177: {
178: zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
179: return closure->this_ptr;
180: }
181: /* }}} */
182:
183: static zend_function *zend_closure_get_method(zval **object_ptr, char *method_name, int method_len, const zend_literal *key TSRMLS_DC) /* {{{ */
184: {
185: char *lc_name;
186: ALLOCA_FLAG(use_heap)
187:
188: lc_name = do_alloca(method_len + 1, use_heap);
189: zend_str_tolower_copy(lc_name, method_name, method_len);
190: if ((method_len == sizeof(ZEND_INVOKE_FUNC_NAME)-1) &&
191: memcmp(lc_name, ZEND_INVOKE_FUNC_NAME, sizeof(ZEND_INVOKE_FUNC_NAME)-1) == 0
192: ) {
193: free_alloca(lc_name, use_heap);
194: return zend_get_closure_invoke_method(*object_ptr TSRMLS_CC);
195: }
196: free_alloca(lc_name, use_heap);
197: return std_object_handlers.get_method(object_ptr, method_name, method_len, key TSRMLS_CC);
198: }
199: /* }}} */
200:
201: static zval *zend_closure_read_property(zval *object, zval *member, int type, const zend_literal *key TSRMLS_DC) /* {{{ */
202: {
203: ZEND_CLOSURE_PROPERTY_ERROR();
204: Z_ADDREF(EG(uninitialized_zval));
205: return &EG(uninitialized_zval);
206: }
207: /* }}} */
208:
209: static void zend_closure_write_property(zval *object, zval *member, zval *value, const zend_literal *key TSRMLS_DC) /* {{{ */
210: {
211: ZEND_CLOSURE_PROPERTY_ERROR();
212: }
213: /* }}} */
214:
215: static zval **zend_closure_get_property_ptr_ptr(zval *object, zval *member, const zend_literal *key TSRMLS_DC) /* {{{ */
216: {
217: ZEND_CLOSURE_PROPERTY_ERROR();
218: return NULL;
219: }
220: /* }}} */
221:
222: static int zend_closure_has_property(zval *object, zval *member, int has_set_exists, const zend_literal *key TSRMLS_DC) /* {{{ */
223: {
224: if (has_set_exists != 2) {
225: ZEND_CLOSURE_PROPERTY_ERROR();
226: }
227: return 0;
228: }
229: /* }}} */
230:
231: static void zend_closure_unset_property(zval *object, zval *member, const zend_literal *key TSRMLS_DC) /* {{{ */
232: {
233: ZEND_CLOSURE_PROPERTY_ERROR();
234: }
235: /* }}} */
236:
237: static void zend_closure_free_storage(void *object TSRMLS_DC) /* {{{ */
238: {
239: zend_closure *closure = (zend_closure *)object;
240:
241: zend_object_std_dtor(&closure->std TSRMLS_CC);
242:
243: if (closure->func.type == ZEND_USER_FUNCTION) {
244: zend_execute_data *ex = EG(current_execute_data);
245: while (ex) {
246: if (ex->op_array == &closure->func.op_array) {
247: zend_error(E_ERROR, "Cannot destroy active lambda function");
248: }
249: ex = ex->prev_execute_data;
250: }
251: destroy_op_array(&closure->func.op_array TSRMLS_CC);
252: }
253:
254: if (closure->debug_info != NULL) {
255: zend_hash_destroy(closure->debug_info);
256: efree(closure->debug_info);
257: }
258:
259: if (closure->this_ptr) {
260: zval_ptr_dtor(&closure->this_ptr);
261: }
262:
263: efree(closure);
264: }
265: /* }}} */
266:
267: static zend_object_value zend_closure_new(zend_class_entry *class_type TSRMLS_DC) /* {{{ */
268: {
269: zend_closure *closure;
270: zend_object_value object;
271:
272: closure = emalloc(sizeof(zend_closure));
273: memset(closure, 0, sizeof(zend_closure));
274:
275: zend_object_std_init(&closure->std, class_type TSRMLS_CC);
276:
277: object.handle = zend_objects_store_put(closure, (zend_objects_store_dtor_t)zend_objects_destroy_object, (zend_objects_free_object_storage_t) zend_closure_free_storage, NULL TSRMLS_CC);
278: object.handlers = &closure_handlers;
279:
280: return object;
281: }
282: /* }}} */
283:
284: static zend_object_value zend_closure_clone(zval *zobject TSRMLS_DC) /* {{{ */
285: {
286: zend_closure *closure = (zend_closure *)zend_object_store_get_object(zobject TSRMLS_CC);
287: zval result;
288:
289: zend_create_closure(&result, &closure->func, closure->func.common.scope, closure->this_ptr TSRMLS_CC);
290: return Z_OBJVAL(result);
291: }
292: /* }}} */
293:
294:
295: int zend_closure_get_closure(zval *obj, zend_class_entry **ce_ptr, zend_function **fptr_ptr, zval **zobj_ptr TSRMLS_DC) /* {{{ */
296: {
297: zend_closure *closure;
298:
299: if (Z_TYPE_P(obj) != IS_OBJECT) {
300: return FAILURE;
301: }
302:
303: closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
304: *fptr_ptr = &closure->func;
305:
306: if (closure->this_ptr) {
307: if (zobj_ptr) {
308: *zobj_ptr = closure->this_ptr;
309: }
310: *ce_ptr = Z_OBJCE_P(closure->this_ptr);
311: } else {
312: if (zobj_ptr) {
313: *zobj_ptr = NULL;
314: }
315: *ce_ptr = closure->func.common.scope;
316: }
317: return SUCCESS;
318: }
319: /* }}} */
320:
321: static HashTable *zend_closure_get_debug_info(zval *object, int *is_temp TSRMLS_DC) /* {{{ */
322: {
323: zend_closure *closure = (zend_closure *)zend_object_store_get_object(object TSRMLS_CC);
324: zval *val;
325: struct _zend_arg_info *arg_info = closure->func.common.arg_info;
326:
327: *is_temp = 0;
328:
329: if (closure->debug_info == NULL) {
330: ALLOC_HASHTABLE(closure->debug_info);
331: zend_hash_init(closure->debug_info, 1, NULL, ZVAL_PTR_DTOR, 0);
332: }
333: if (closure->debug_info->nApplyCount == 0) {
334: if (closure->func.type == ZEND_USER_FUNCTION && closure->func.op_array.static_variables) {
335: HashTable *static_variables = closure->func.op_array.static_variables;
336: MAKE_STD_ZVAL(val);
337: array_init(val);
338: zend_hash_copy(Z_ARRVAL_P(val), static_variables, (copy_ctor_func_t)zval_add_ref, NULL, sizeof(zval*));
339: zend_hash_update(closure->debug_info, "static", sizeof("static"), (void *) &val, sizeof(zval *), NULL);
340: }
341:
342: if (closure->this_ptr) {
343: Z_ADDREF_P(closure->this_ptr);
344: zend_symtable_update(closure->debug_info, "this", sizeof("this"), (void *) &closure->this_ptr, sizeof(zval *), NULL);
345: }
346:
347: if (arg_info) {
348: zend_uint i, required = closure->func.common.required_num_args;
349:
350: MAKE_STD_ZVAL(val);
351: array_init(val);
352:
353: for (i = 0; i < closure->func.common.num_args; i++) {
354: char *name, *info;
355: int name_len, info_len;
356: if (arg_info->name) {
357: name_len = zend_spprintf(&name, 0, "%s$%s",
358: arg_info->pass_by_reference ? "&" : "",
359: arg_info->name);
360: } else {
361: name_len = zend_spprintf(&name, 0, "%s$param%d",
362: arg_info->pass_by_reference ? "&" : "",
363: i + 1);
364: }
365: info_len = zend_spprintf(&info, 0, "%s",
366: i >= required ? "<optional>" : "<required>");
367: add_assoc_stringl_ex(val, name, name_len + 1, info, info_len, 0);
368: efree(name);
369: arg_info++;
370: }
371: zend_hash_update(closure->debug_info, "parameter", sizeof("parameter"), (void *) &val, sizeof(zval *), NULL);
372: }
373: }
374:
375: return closure->debug_info;
376: }
377: /* }}} */
378:
379: static HashTable *zend_closure_get_gc(zval *obj, zval ***table, int *n TSRMLS_DC) /* {{{ */
380: {
381: zend_closure *closure = (zend_closure *)zend_object_store_get_object(obj TSRMLS_CC);
382:
383: *table = closure->this_ptr ? &closure->this_ptr : NULL;
384: *n = closure->this_ptr ? 1 : 0;
385: return (closure->func.type == ZEND_USER_FUNCTION) ?
386: closure->func.op_array.static_variables : NULL;
387: }
388: /* }}} */
389:
390: /* {{{ proto Closure::__construct()
391: Private constructor preventing instantiation */
392: ZEND_METHOD(Closure, __construct)
393: {
394: zend_error(E_RECOVERABLE_ERROR, "Instantiation of 'Closure' is not allowed");
395: }
396: /* }}} */
397:
398: ZEND_BEGIN_ARG_INFO_EX(arginfo_closure_bindto, 0, 0, 1)
399: ZEND_ARG_INFO(0, newthis)
400: ZEND_ARG_INFO(0, newscope)
401: ZEND_END_ARG_INFO()
402:
403: ZEND_BEGIN_ARG_INFO_EX(arginfo_closure_bind, 0, 0, 2)
404: ZEND_ARG_INFO(0, closure)
405: ZEND_ARG_INFO(0, newthis)
406: ZEND_ARG_INFO(0, newscope)
407: ZEND_END_ARG_INFO()
408:
409: static const zend_function_entry closure_functions[] = {
410: ZEND_ME(Closure, __construct, NULL, ZEND_ACC_PRIVATE)
411: ZEND_ME(Closure, bind, arginfo_closure_bind, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
412: ZEND_MALIAS(Closure, bindTo, bind, arginfo_closure_bindto, ZEND_ACC_PUBLIC)
413: {NULL, NULL, NULL}
414: };
415:
416: void zend_register_closure_ce(TSRMLS_D) /* {{{ */
417: {
418: zend_class_entry ce;
419:
420: INIT_CLASS_ENTRY(ce, "Closure", closure_functions);
421: zend_ce_closure = zend_register_internal_class(&ce TSRMLS_CC);
422: zend_ce_closure->ce_flags |= ZEND_ACC_FINAL_CLASS;
423: zend_ce_closure->create_object = zend_closure_new;
424: zend_ce_closure->serialize = zend_class_serialize_deny;
425: zend_ce_closure->unserialize = zend_class_unserialize_deny;
426:
427: memcpy(&closure_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
428: closure_handlers.get_constructor = zend_closure_get_constructor;
429: closure_handlers.get_method = zend_closure_get_method;
430: closure_handlers.write_property = zend_closure_write_property;
431: closure_handlers.read_property = zend_closure_read_property;
432: closure_handlers.get_property_ptr_ptr = zend_closure_get_property_ptr_ptr;
433: closure_handlers.has_property = zend_closure_has_property;
434: closure_handlers.unset_property = zend_closure_unset_property;
435: closure_handlers.compare_objects = zend_closure_compare_objects;
436: closure_handlers.clone_obj = zend_closure_clone;
437: closure_handlers.get_debug_info = zend_closure_get_debug_info;
438: closure_handlers.get_closure = zend_closure_get_closure;
439: closure_handlers.get_gc = zend_closure_get_gc;
440: }
441: /* }}} */
442:
443: ZEND_API void zend_create_closure(zval *res, zend_function *func, zend_class_entry *scope, zval *this_ptr TSRMLS_DC) /* {{{ */
444: {
445: zend_closure *closure;
446:
447: object_init_ex(res, zend_ce_closure);
448:
449: closure = (zend_closure *)zend_object_store_get_object(res TSRMLS_CC);
450:
451: closure->func = *func;
452: closure->func.common.prototype = NULL;
453:
454: if ((scope == NULL) && (this_ptr != NULL)) {
455: /* use dummy scope if we're binding an object without specifying a scope */
456: /* maybe it would be better to create one for this purpose */
457: scope = zend_ce_closure;
458: }
459:
460: if (closure->func.type == ZEND_USER_FUNCTION) {
461: if (closure->func.op_array.static_variables) {
462: HashTable *static_variables = closure->func.op_array.static_variables;
463:
464: ALLOC_HASHTABLE(closure->func.op_array.static_variables);
465: zend_hash_init(closure->func.op_array.static_variables, zend_hash_num_elements(static_variables), NULL, ZVAL_PTR_DTOR, 0);
466: zend_hash_apply_with_arguments(static_variables TSRMLS_CC, (apply_func_args_t)zval_copy_static_var, 1, closure->func.op_array.static_variables);
467: }
468: closure->func.op_array.run_time_cache = NULL;
469: (*closure->func.op_array.refcount)++;
470: } else {
471: /* verify that we aren't binding internal function to a wrong scope */
472: if(func->common.scope != NULL) {
473: if(scope && !instanceof_function(scope, func->common.scope TSRMLS_CC)) {
474: zend_error(E_WARNING, "Cannot bind function %s::%s to scope class %s", func->common.scope->name, func->common.function_name, scope->name);
475: scope = NULL;
476: }
477: if(scope && this_ptr && (func->common.fn_flags & ZEND_ACC_STATIC) == 0 &&
478: !instanceof_function(Z_OBJCE_P(this_ptr), closure->func.common.scope TSRMLS_CC)) {
479: zend_error(E_WARNING, "Cannot bind function %s::%s to object of class %s", func->common.scope->name, func->common.function_name, Z_OBJCE_P(this_ptr)->name);
480: scope = NULL;
481: this_ptr = NULL;
482: }
483: } else {
484: /* if it's a free function, we won't set scope & this since they're meaningless */
485: this_ptr = NULL;
486: scope = NULL;
487: }
488: }
489:
490: /* Invariants:
491: * If the closure is unscoped, it has no bound object.
492: * The the closure is scoped, it's either static or it's bound */
493: closure->func.common.scope = scope;
494: if (scope) {
495: closure->func.common.fn_flags |= ZEND_ACC_PUBLIC;
496: if (this_ptr && (closure->func.common.fn_flags & ZEND_ACC_STATIC) == 0) {
497: closure->this_ptr = this_ptr;
498: Z_ADDREF_P(this_ptr);
499: } else {
500: closure->func.common.fn_flags |= ZEND_ACC_STATIC;
501: closure->this_ptr = NULL;
502: }
503: } else {
504: closure->this_ptr = NULL;
505: }
506: }
507: /* }}} */
508:
509: /*
510: * Local variables:
511: * tab-width: 4
512: * c-basic-offset: 4
513: * indent-tabs-mode: t
514: * End:
515: */
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