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 "data.h"
  34
  35 struct psi_decl_extvar *psi_decl_extvar_init(struct psi_decl_arg *arg)
  36 {
  37         struct psi_decl_extvar *evar = calloc(1, sizeof(*evar));
  38
  39         evar->arg = arg;
  40         return evar;
  41 }
  42
  43 void psi_decl_extvar_free(struct psi_decl_extvar **evar_ptr)
  44 {
  45         if (*evar_ptr) {
  46                 struct psi_decl_extvar *evar = *evar_ptr;
  47
  48                 *evar_ptr = NULL;
  49                 if (evar->token) {
  50                         free(evar->token);
  51                 }
  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);
  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);
  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);
  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,
  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, "void");
 119         struct psi_decl_var *func_var = psi_decl_var_copy(evar->arg->var);
 120         struct psi_decl_arg *func = psi_decl_arg_init(func_type, func_var);
 121         struct psi_decl_type *arg_type = psi_decl_type_copy(evar->arg->type);
 122         struct psi_decl_var *arg_var = psi_decl_var_copy(evar->arg->var);
 123         struct psi_decl_arg *arg = psi_decl_arg_init(arg_type, arg_var);
 124         struct psi_plist *args = psi_plist_init((psi_plist_dtor) psi_decl_arg_free);
 125         struct psi_decl *decl = psi_decl_init(func, psi_plist_add(args, &arg));
 126
 127         func_var->pointer_level = 0;
 128         func_var->array_size = 0;
 129         func_var->name = realloc(func_var->name, strlen(evar->arg->var->name) + sizeof("_set"));
 130         strcat(func_var->name, "_set");
 131
 132         return decl;
 133 }
 134
 135 void psi_decl_extvar_set(struct psi_decl_extvar *evar, void *ptr)
 136 {
 137         memcpy(evar->sym, ptr, evar->size);
 138 }
 139
 140 struct psi_decl *psi_decl_extvar_getter(struct psi_decl_extvar *evar)
 141 {
 142         struct psi_decl_type *func_type = psi_decl_type_copy(evar->arg->type);
 143         struct psi_decl_var *func_var = psi_decl_var_copy(evar->arg->var);
 144         struct psi_decl_arg *func = psi_decl_arg_init(func_type, func_var);
 145         struct psi_decl *decl = psi_decl_init(func, NULL);
 146
 147         func_var->name = realloc(func_var->name, strlen(evar->arg->var->name) + sizeof("_get"));
 148         strcat(func_var->name, "_get");
 149
 150         return decl;
 151 }
 152
 153 void psi_decl_extvar_get(struct psi_decl_extvar *evar, void *ptr)
 154 {
 155         memcpy(ptr, evar->sym, evar->size);
 156 }
 157
 158
 159 bool psi_decl_extvar_is_blacklisted(const char *name)
 160 {
 161         char *blacklisted;
 162         size_t i = 0;
 163
 164         while (psi_plist_get(PSI_G(blacklist).vars, i++, &blacklisted)) {
 165                 if (!fnmatch(blacklisted, name, 0)) {
 166                         return true;
 167                 }
 168         }
 169         return false;
 170 }
 171