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

   1 /*******************************************************************************
   2  Copyright (c) 2016, 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 #define PSI_FUNC_REDIRS
  36 #include "php_psi_posix.h"
  37
  38 struct psi_decl *psi_decl_init(struct psi_decl_arg *func, struct psi_plist *args)
  39 {
  40         struct psi_decl *d = calloc(1, sizeof(*d));
  41
  42         d->func = func;
  43         d->args = args;
  44
  45         return d;
  46 }
  47
  48 void psi_decl_free(struct psi_decl **d_ptr)
  49 {
  50         if (*d_ptr) {
  51                 struct psi_decl *d = *d_ptr;
  52
  53                 *d_ptr = NULL;
  54
  55                 psi_decl_abi_free(&d->abi);
  56                 psi_decl_arg_free(&d->func);
  57                 if (d->args) {
  58                         psi_plist_free(d->args);
  59                 }
  60                 if (d->redir) {
  61                         free(d->redir);
  62                 }
  63                 free(d);
  64         }
  65 }
  66
  67 void psi_decl_dump(int fd, struct psi_decl *decl)
  68 {
  69         psi_decl_abi_dump(fd, decl->abi);
  70         dprintf(fd, " ");
  71         /* FIXME: functions returning arrays */
  72         psi_decl_arg_dump(fd, decl->func, 0);
  73         dprintf(fd, "(");
  74         if (decl->args) {
  75                 size_t i;
  76                 struct psi_decl_arg *arg;
  77
  78                 for (i = 0; psi_plist_get(decl->args, i, &arg); ++i) {
  79                         if (i) {
  80                                 dprintf(fd, ", ");
  81                         }
  82                         psi_decl_arg_dump(fd, arg, 0);
  83                 }
  84                 if (decl->varargs) {
  85                         dprintf(fd, ", ...");
  86                 }
  87         }
  88         if (decl->redir) {
  89                 dprintf(fd, ") __asm__ (\"%s\");", decl->redir);
  90         } else {
  91                 dprintf(fd, ");");
  92         }
  93 }
  94
  95 static inline bool psi_decl_validate_func(struct psi_data *data,
  96                 struct psi_decl *decl, struct psi_decl_arg *func)
  97 {
  98         struct psi_func_redir *redir;
  99
 100         if (!func->var->name) {
 101                 data->error(data, func->token, PSI_WARNING, "Cannot load anonymous decl");
 102                 return false;
 103         }
 104
 105         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
 106                 if (!strcmp(func->var->name, redir->name)) {
 107                         decl->sym = redir->func;
 108                 }
 109         }
 110         if (!decl->sym) {
 111                 size_t i = 0;
 112                 void *dl;
 113
 114                 while (!decl->sym && psi_plist_get(data->file.dlopened, i++, &dl)) {
 115                         decl->sym = dlsym(dl, decl->redir ?: func->var->name);
 116                 }
 117         }
 118         if (!decl->sym) {
 119 #ifndef RTLD_NEXT
 120 # define RTLD_NEXT ((void *) -1l)
 121 #endif
 122 #ifndef RTLD_DEFAULT
 123 # define RTLD_DEFAULT ((void *) 0)
 124 #endif
 125                 decl->sym = dlsym(RTLD_DEFAULT, decl->redir ?: func->var->name);
 126                 if (!decl->sym) {
 127                         data->error(data, func->token, PSI_WARNING,
 128                                         "Failed to locate symbol '%s(%s)': %s",
 129                                         func->var->name, decl->redir ?: "",
 130                                         dlerror() ?: "not found");
 131                         return false;
 132                 }
 133         }
 134         return true;
 135 }
 136
 137 bool psi_decl_validate(struct psi_data *data, struct psi_decl *decl,
 138                 struct psi_validate_scope *scope)
 139 {
 140         if (!psi_decl_validate_nodl(data, decl, scope)) {
 141                 return false;
 142         }
 143         if (!psi_decl_validate_func(data, decl, decl->func)) {
 144                 return false;
 145         }
 146
 147         return true;
 148 }
 149
 150 bool psi_decl_validate_nodl(struct psi_data *data, struct psi_decl *decl,
 151                 struct psi_validate_scope *scope)
 152 {
 153         if (!decl->abi) {
 154                 decl->abi = psi_decl_abi_init("default");
 155         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 156                 data->error(data, decl->abi->token, PSI_WARNING,
 157                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 158                 return false;
 159         }
 160         if (!psi_decl_arg_validate(data, decl->func, scope)) {
 161                 return false;
 162         }
 163         if (decl->args) {
 164                 size_t i = 0;
 165                 struct psi_decl_arg *arg;
 166
 167                 while (psi_plist_get(decl->args, i++, &arg)) {
 168                         if (!arg->var->name) {
 169                                 arg->var->name = malloc(7);
 170                                 snprintf(arg->var->name, 6, "arg%zu", i);
 171                                 arg->var->fqn = strdup(arg->var->name);
 172                         }
 173                         if (!psi_decl_arg_validate(data, arg, scope)) {
 174                                 return false;
 175                         }
 176                 }
 177         }
 178
 179         return true;
 180 }
 181
 182 bool psi_decl_is_blacklisted(const char *name)
 183 {
 184         char *blacklisted;
 185         size_t i = 0;
 186
 187         while (psi_plist_get(PSI_G(blacklist).decls, i++, &blacklisted)) {
 188                 if (!fnmatch(blacklisted, name, 0)) {
 189                         return true;
 190                 }
 191         }
 192         return false;
 193 }
 194
 195 struct psi_decl_arg *psi_decl_get_arg(struct psi_decl *decl, struct psi_decl_var *var) {
 196         if (var->arg) {
 197                 size_t i = 0;
 198                 struct psi_decl_arg *arg = decl->func;
 199
 200                 do {
 201                         if (var->arg == arg) {
 202                                 return arg;
 203                         }
 204                 } while (psi_plist_get(decl->args, i++, &arg));
 205         }
 206
 207         return psi_decl_arg_get_by_var(var, decl->args, decl->func);
 208 }
 209