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 = pecalloc(1, sizeof(*evar), 1);
  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         zend_string *type_str = zend_string_init_interned(ZEND_STRS("void"), 1);
 119         struct psi_decl_type *func_type = psi_decl_type_init(PSI_T_VOID, type_str);
 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         zend_string_release(type_str);
 130
 131         func_var->pointer_level = 0;
 132         func_var->array_size = 0;
 133
 134         smart_str_append_ex(&name, func_var->name, 1);
 135         smart_str_appendl_ex(&name, ZEND_STRL("_set"), 1);
 136         zend_string_release(func_var->name);
 137         func_var->name = zend_new_interned_string(smart_str_extract(&name));
 138
 139         decl->extvar = 1;
 140
 141         return decl;
 142 }
 143
 144 void psi_decl_extvar_set(struct psi_decl_extvar *evar, void *ptr)
 145 {
 146         memcpy(evar->sym, ptr, evar->size);
 147 }
 148
 149 struct psi_decl *psi_decl_extvar_getter(struct psi_decl_extvar *evar)
 150 {
 151         struct psi_decl_type *func_type = psi_decl_type_copy(evar->arg->type);
 152         struct psi_decl_var *func_var = psi_decl_var_copy(evar->arg->var);
 153         struct psi_decl_arg *func = psi_decl_arg_init(func_type, func_var);
 154         struct psi_decl *decl = psi_decl_init(func, NULL);
 155         smart_str name = {0};
 156
 157         smart_str_append_ex(&name, func_var->name, 1);
 158         smart_str_appendl_ex(&name, ZEND_STRL("_get"), 1);
 159         zend_string_release(func_var->name);
 160         func_var->name = zend_new_interned_string(smart_str_extract(&name));
 161
 162         decl->extvar = 1;
 163
 164         return decl;
 165 }
 166
 167 void psi_decl_extvar_get(struct psi_decl_extvar *evar, void *ptr)
 168 {
 169         memcpy(ptr, evar->sym, evar->size);
 170 }
 171
 172
 173 bool psi_decl_extvar_is_blacklisted(const char *name)
 174 {
 175         char *blacklisted;
 176         size_t i = 0;
 177
 178         while (psi_plist_get(PSI_G(blacklist).vars, i++, &blacklisted)) {
 179                 if (!fnmatch(blacklisted, name, 0)) {
 180                         return true;
 181                 }
 182         }
 183         return false;
 184 }
 185