git.m6w6.name Git - m6w6/ext-psi/blob - src/types/decl_extvar.c

   1 /*******************************************************************************
   2  Copyright (c) 2017, Michael Wallner <mike@php.net>.
   3  All rights reserved.
   4
   5  Redistribution and use in source and binary forms, with or without
   6  modification, are permitted provided that the following conditions are met:
   7
   8      * Redistributions of source code must retain the above copyright notice,
   9        this list of conditions and the following disclaimer.
  10      * Redistributions in binary form must reproduce the above copyright
  11        notice, this list of conditions and the following disclaimer in the
  12        documentation and/or other materials provided with the distribution.
  13
  14  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  15  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  18  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  21  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  22  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 *******************************************************************************/
  25
  26 #include "php_psi_stdinc.h"
  27
  28 #include "php_psi.h"
  29
  30 #include <dlfcn.h>
  31 #include <fnmatch.h>
  32
  33 #include <Zend/zend_smart_str.h>
  34
  35 #include "data.h"
  36
  37 struct psi_decl_extvar *psi_decl_extvar_init(struct psi_decl_arg *arg)
  38 {
  39         struct psi_decl_extvar *evar = calloc(1, sizeof(*evar));
  40
  41         evar->arg = arg;
  42         return evar;
  43 }
  44
  45 void psi_decl_extvar_free(struct psi_decl_extvar **evar_ptr)
  46 {
  47         if (*evar_ptr) {
  48                 struct psi_decl_extvar *evar = *evar_ptr;
  49
  50                 *evar_ptr = NULL;
  51                 psi_token_free(&evar->token);
  52                 psi_decl_arg_free(&evar->arg);
  53                 psi_decl_free(&evar->getter);
  54                 psi_decl_free(&evar->setter);
  55                 free(evar);
  56         }
  57 }
  58
  59 bool psi_decl_extvar_validate(struct psi_data *data,
  60                 struct psi_decl_extvar *evar, struct psi_validate_scope *scope)
  61 {
  62         if (!psi_decl_arg_validate(data, evar->arg, scope)) {
  63                 return false;
  64         }
  65
  66         evar->size = psi_decl_arg_get_size(evar->arg);
  67         if (!evar->size) {
  68                 data->error(data, evar->arg->var->token, PSI_WARNING,
  69                                 "Failed to calculate size of symbol '%s'", evar->arg->var->name->val);
  70                 return false;
  71         }
  72
  73         if (!evar->sym) {
  74                 size_t i = 0;
  75                 void *dl;
  76
  77                 while (!evar->sym && psi_plist_get(data->file.dlopened, i++, &dl)) {
  78                         evar->sym = dlsym(dl, evar->arg->var->name->val);
  79                 }
  80         }
  81         if (!evar->sym) {
  82 #ifndef RTLD_NEXT
  83 # define RTLD_NEXT ((void *) -1l)
  84 #endif
  85 #ifndef RTLD_DEFAULT
  86 # define RTLD_DEFAULT ((void *) 0)
  87 #endif
  88                 evar->sym = dlsym(RTLD_DEFAULT, evar->arg->var->name->val);
  89                 if (!evar->sym) {
  90                         data->error(data, evar->arg->var->token, PSI_WARNING,
  91                                         "Failed to locate symbol '%s': %s", evar->arg->var->name->val,
  92                                         dlerror() ?: "not found");
  93                         return false;
  94                 }
  95         }
  96
  97         evar->getter = psi_decl_extvar_getter(evar);
  98         if (!psi_decl_validate_nodl(data, evar->getter, scope)) {
  99                 return false;
 100         }
 101         evar->setter = psi_decl_extvar_setter(evar);
 102         if (!psi_decl_validate_nodl(data, evar->setter, scope)) {
 103                 return false;
 104         }
 105
 106         return true;
 107 }
 108
 109 void psi_decl_extvar_dump(int fd, struct psi_decl_extvar *evar)
 110 {
 111         dprintf(fd, "extern ");
 112         psi_decl_arg_dump(fd, evar->arg, 0);
 113         dprintf(fd, ";\n");
 114 }
 115
 116 struct psi_decl *psi_decl_extvar_setter(struct psi_decl_extvar *evar)
 117 {
 118         struct psi_decl_type *func_type = psi_decl_type_init(PSI_T_VOID,
 119                         zend_string_init(ZEND_STRS("void"), 1));
 120         struct psi_decl_var *func_var = psi_decl_var_copy(evar->arg->var);
 121         struct psi_decl_arg *func = psi_decl_arg_init(func_type, func_var);
 122         struct psi_decl_type *arg_type = psi_decl_type_copy(evar->arg->type);
 123         struct psi_decl_var *arg_var = psi_decl_var_copy(evar->arg->var);
 124         struct psi_decl_arg *arg = psi_decl_arg_init(arg_type, arg_var);
 125         struct psi_plist *args = psi_plist_init((psi_plist_dtor) psi_decl_arg_free);
 126         struct psi_decl *decl = psi_decl_init(func, psi_plist_add(args, &arg));
 127         smart_str name = {0};
 128
 129         func_var->pointer_level = 0;
 130         func_var->array_size = 0;
 131
 132         smart_str_append_ex(&name, func_var->name, 1);
 133         smart_str_appendl_ex(&name, ZEND_STRL("_set"), 1);
 134         zend_string_release(func_var->name);
 135         func_var->name = smart_str_extract(&name);
 136
 137         decl->extvar = 1;
 138
 139         return decl;
 140 }
 141
 142 void psi_decl_extvar_set(struct psi_decl_extvar *evar, void *ptr)
 143 {
 144         memcpy(evar->sym, ptr, evar->size);
 145 }
 146
 147 struct psi_decl *psi_decl_extvar_getter(struct psi_decl_extvar *evar)
 148 {
 149         struct psi_decl_type *func_type = psi_decl_type_copy(evar->arg->type);
 150         struct psi_decl_var *func_var = psi_decl_var_copy(evar->arg->var);
 151         struct psi_decl_arg *func = psi_decl_arg_init(func_type, func_var);
 152         struct psi_decl *decl = psi_decl_init(func, NULL);
 153         smart_str name = {0};
 154
 155         smart_str_append_ex(&name, func_var->name, 1);
 156         smart_str_appendl_ex(&name, ZEND_STRL("_set"), 1);
 157         zend_string_release(func_var->name);
 158         func_var->name = smart_str_extract(&name);
 159
 160         decl->extvar = 1;
 161
 162         return decl;
 163 }
 164
 165 void psi_decl_extvar_get(struct psi_decl_extvar *evar, void *ptr)
 166 {
 167         memcpy(ptr, evar->sym, evar->size);
 168 }
 169
 170
 171 bool psi_decl_extvar_is_blacklisted(const char *name)
 172 {
 173         char *blacklisted;
 174         size_t i = 0;
 175
 176         while (psi_plist_get(PSI_G(blacklist).vars, i++, &blacklisted)) {
 177                 if (!fnmatch(blacklisted, name, 0)) {
 178                         return true;
 179                 }
 180         }
 181         return false;
 182 }
 183