ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, zend_ulong flags) { zend_constant *c; const char *colon; zend_class_entry *ce = NULL; zend_string *class_name; const char *name = cname->val; size_t name_len = cname->len; /* Skip leading \\ */ if (name[0] == '\\') { name += 1; name_len -= 1; cname = NULL; } if ((colon = zend_memrchr(name, ':', name_len)) && colon > name && (*(colon - 1) == ':')) { int class_name_len = colon - name - 1; size_t const_name_len = name_len - class_name_len - 2; zend_string *constant_name = zend_string_init(colon + 1, const_name_len, 0); char *lcname; zval *ret_constant = NULL; ALLOCA_FLAG(use_heap) class_name = zend_string_init(name, class_name_len, 0); lcname = do_alloca(class_name_len + 1, use_heap); zend_str_tolower_copy(lcname, name, class_name_len); if (!scope) { if (EG(current_execute_data)) { scope = EG(scope); } else { scope = CG(active_class_entry); } } if (class_name_len == sizeof("self")-1 && !memcmp(lcname, "self", sizeof("self")-1)) { if (UNEXPECTED(!scope)) { zend_error(E_EXCEPTION | E_ERROR, "Cannot access self:: when no class scope is active"); return NULL; } ce = scope; } else if (class_name_len == sizeof("parent")-1 && !memcmp(lcname, "parent", sizeof("parent")-1)) { if (UNEXPECTED(!scope)) { zend_error(E_EXCEPTION | E_ERROR, "Cannot access parent:: when no class scope is active"); return NULL; } else if (UNEXPECTED(!scope->parent)) { zend_error(E_EXCEPTION | E_ERROR, "Cannot access parent:: when current class scope has no parent"); return NULL; } else { ce = scope->parent; } } else if (class_name_len == sizeof("static")-1 && !memcmp(lcname, "static", sizeof("static")-1)) { ce = zend_get_called_scope(EG(current_execute_data)); if (UNEXPECTED(!ce)) { zend_error(E_EXCEPTION | E_ERROR, "Cannot access static:: when no class scope is active"); return NULL; } } else { ce = zend_fetch_class(class_name, flags); } free_alloca(lcname, use_heap); if (ce) { ret_constant = zend_hash_find(&ce->constants_table, constant_name); if (ret_constant == NULL) { if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) { zend_error(E_EXCEPTION | E_ERROR, "Undefined class constant '%s::%s'", class_name->val, constant_name->val); zend_string_release(class_name); zend_string_free(constant_name); return NULL; } } else if (Z_ISREF_P(ret_constant)) { ret_constant = Z_REFVAL_P(ret_constant); } } zend_string_release(class_name); zend_string_free(constant_name); if (ret_constant && Z_CONSTANT_P(ret_constant)) { if (UNEXPECTED(zval_update_constant_ex(ret_constant, 1, ce) != SUCCESS)) { return NULL; } } return ret_constant; } /* non-class constant */ if ((colon = zend_memrchr(name, '\\', name_len)) != NULL) { /* compound constant name */ int prefix_len = colon - name; size_t const_name_len = name_len - prefix_len - 1; const char *constant_name = colon + 1; char *lcname; size_t lcname_len; ALLOCA_FLAG(use_heap) lcname_len = prefix_len + 1 + const_name_len; lcname = do_alloca(lcname_len + 1, use_heap); zend_str_tolower_copy(lcname, name, prefix_len); /* Check for namespace constant */ lcname[prefix_len] = '\\'; memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1); if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) == NULL) { /* try lowercase */ zend_str_tolower(lcname + prefix_len + 1, const_name_len); if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) != NULL) { if ((c->flags & CONST_CS) != 0) { c = NULL; } } } free_alloca(lcname, use_heap); if (c) { return &c->value; } /* name requires runtime resolution, need to check non-namespaced name */ if ((flags & IS_CONSTANT_UNQUALIFIED) != 0) { return zend_get_constant_str(constant_name, const_name_len); } return NULL; } if (cname) { return zend_get_constant(cname); } else { return zend_get_constant_str(name, name_len); } }
ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, uint32_t flags) { zend_constant *c; const char *colon; zend_class_entry *ce = NULL; const char *name = ZSTR_VAL(cname); size_t name_len = ZSTR_LEN(cname); /* Skip leading \\ */ if (name[0] == '\\') { name += 1; name_len -= 1; cname = NULL; } if ((colon = zend_memrchr(name, ':', name_len)) && colon > name && (*(colon - 1) == ':')) { int class_name_len = colon - name - 1; size_t const_name_len = name_len - class_name_len - 2; zend_string *constant_name = zend_string_init(colon + 1, const_name_len, 0); zend_string *class_name = zend_string_init(name, class_name_len, 0); zval *ret_constant = NULL; if (zend_string_equals_literal_ci(class_name, "self")) { if (UNEXPECTED(!scope)) { zend_throw_error(NULL, "Cannot access self:: when no class scope is active"); goto failure; } ce = scope; } else if (zend_string_equals_literal_ci(class_name, "parent")) { if (UNEXPECTED(!scope)) { zend_throw_error(NULL, "Cannot access parent:: when no class scope is active"); goto failure; } else if (UNEXPECTED(!scope->parent)) { zend_throw_error(NULL, "Cannot access parent:: when current class scope has no parent"); goto failure; } else { ce = scope->parent; } } else if (zend_string_equals_literal_ci(class_name, "static")) { ce = zend_get_called_scope(EG(current_execute_data)); if (UNEXPECTED(!ce)) { zend_throw_error(NULL, "Cannot access static:: when no class scope is active"); goto failure; } } else { ce = zend_fetch_class(class_name, flags); } if (ce) { zend_class_constant *c = zend_hash_find_ptr(&ce->constants_table, constant_name); if (c == NULL) { if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) { zend_throw_error(NULL, "Undefined class constant '%s::%s'", ZSTR_VAL(class_name), ZSTR_VAL(constant_name)); goto failure; } ret_constant = NULL; } else { if (!zend_verify_const_access(c, scope)) { zend_throw_error(NULL, "Cannot access %s const %s::%s", zend_visibility_string(Z_ACCESS_FLAGS(c->value)), ZSTR_VAL(class_name), ZSTR_VAL(constant_name)); goto failure; } ret_constant = &c->value; } } if (ret_constant && Z_CONSTANT_P(ret_constant)) { if (Z_TYPE_P(ret_constant) == IS_CONSTANT_AST) { if (IS_CONSTANT_VISITED(ret_constant)) { zend_throw_error(NULL, "Cannot declare self-referencing constant '%s::%s'", ZSTR_VAL(class_name), ZSTR_VAL(constant_name)); ret_constant = NULL; goto failure; } MARK_CONSTANT_VISITED(ret_constant); } if (UNEXPECTED(zval_update_constant_ex(ret_constant, ce) != SUCCESS)) { RESET_CONSTANT_VISITED(ret_constant); ret_constant = NULL; goto failure; } RESET_CONSTANT_VISITED(ret_constant); } failure: zend_string_release(class_name); zend_string_free(constant_name); return ret_constant; } /* non-class constant */ if ((colon = zend_memrchr(name, '\\', name_len)) != NULL) { /* compound constant name */ int prefix_len = colon - name; size_t const_name_len = name_len - prefix_len - 1; const char *constant_name = colon + 1; char *lcname; size_t lcname_len; ALLOCA_FLAG(use_heap) lcname_len = prefix_len + 1 + const_name_len; lcname = do_alloca(lcname_len + 1, use_heap); zend_str_tolower_copy(lcname, name, prefix_len); /* Check for namespace constant */ lcname[prefix_len] = '\\'; memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1); if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) == NULL) { /* try lowercase */ zend_str_tolower(lcname + prefix_len + 1, const_name_len); if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) != NULL) { if ((c->flags & CONST_CS) != 0) { c = NULL; } } } free_alloca(lcname, use_heap); if (c) { return &c->value; } /* name requires runtime resolution, need to check non-namespaced name */ if ((flags & IS_CONSTANT_UNQUALIFIED) != 0) { return zend_get_constant_str(constant_name, const_name_len); } return NULL; } if (cname) { return zend_get_constant(cname); } else { return zend_get_constant_str(name, name_len); } }