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 #include "php_psi.h"
  28
  29 #include <dlfcn.h>
  30 #include <fnmatch.h>
  31
  32 #include <Zend/zend_smart_str.h>
  33
  34 #include "data.h"
  35
  36 #define PSI_FUNC_REDIRS
  37 #include "php_psi_posix.h"
  38
  39 struct psi_decl *psi_decl_init(struct psi_decl_arg *func, struct psi_plist *args)
  40 {
  41         struct psi_decl *d = calloc(1, sizeof(*d));
  42
  43         d->func = func;
  44         d->args = args;
  45
  46         return d;
  47 }
  48
  49 void psi_decl_free(struct psi_decl **d_ptr)
  50 {
  51         if (*d_ptr) {
  52                 struct psi_decl *d = *d_ptr;
  53
  54                 *d_ptr = NULL;
  55
  56                 psi_decl_abi_free(&d->abi);
  57                 psi_decl_arg_free(&d->func);
  58                 if (d->args) {
  59                         psi_plist_free(d->args);
  60                 }
  61                 if (d->redir) {
  62                         zend_string_release(d->redir);
  63                 }
  64                 free(d);
  65         }
  66 }
  67
  68 void psi_decl_dump(int fd, struct psi_decl *decl)
  69 {
  70         if (decl->abi) {
  71                 psi_decl_abi_dump(fd, decl->abi);
  72         }
  73         dprintf(fd, " ");
  74         /* FIXME: functions returning arrays */
  75         psi_decl_arg_dump(fd, decl->func, 0);
  76         dprintf(fd, "(");
  77         if (decl->args) {
  78                 size_t i;
  79                 struct psi_decl_arg *arg;
  80
  81                 for (i = 0; psi_plist_get(decl->args, i, &arg); ++i) {
  82                         if (i) {
  83                                 dprintf(fd, ", ");
  84                         }
  85                         psi_decl_arg_dump(fd, arg, 0);
  86                 }
  87                 if (decl->varargs) {
  88                         dprintf(fd, ", ...");
  89                 }
  90         }
  91         if (decl->func->var->array_size) {
  92                 dprintf(fd, ")[%u]", decl->func->var->array_size);
  93         }
  94         if (decl->redir) {
  95                 dprintf(fd, ") __asm__ (\"%s\");", decl->redir->val);
  96         } else {
  97                 dprintf(fd, ");");
  98         }
  99 }
 100
 101 static inline bool psi_decl_validate_func(struct psi_data *data,
 102                 struct psi_decl *decl, struct psi_decl_arg *func)
 103 {
 104         struct psi_func_redir *redir;
 105
 106         if (!func->var->name) {
 107                 data->error(data, func->token, PSI_WARNING, "Cannot load anonymous decl");
 108                 return false;
 109         }
 110
 111         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
 112                 if (!strcmp(func->var->name->val, redir->name)) {
 113                         decl->sym = redir->func;
 114                 }
 115         }
 116         if (!decl->sym) {
 117                 size_t i = 0;
 118                 void *dl;
 119
 120                 while (!decl->sym && psi_plist_get(data->file.dlopened, i++, &dl)) {
 121                         decl->sym = dlsym(dl, decl->redir ? decl->redir->val : func->var->name->val);
 122                 }
 123         }
 124         if (!decl->sym) {
 125 #ifndef RTLD_NEXT
 126 # define RTLD_NEXT ((void *) -1l)
 127 #endif
 128 #ifndef RTLD_DEFAULT
 129 # define RTLD_DEFAULT ((void *) 0)
 130 #endif
 131                 decl->sym = dlsym(RTLD_DEFAULT, decl->redir ? decl->redir->val : func->var->name->val);
 132                 if (!decl->sym) {
 133                         data->error(data, func->token, PSI_WARNING,
 134                                         "Failed to locate symbol '%s(%s)': %s",
 135                                         func->var->name->val,
 136                                         decl->redir ? decl->redir->val : "",
 137                                         dlerror() ?: "not found");
 138                         return false;
 139                 }
 140         }
 141         return true;
 142 }
 143
 144 bool psi_decl_validate(struct psi_data *data, struct psi_decl *decl,
 145                 struct psi_validate_scope *scope)
 146 {
 147         if (!psi_decl_validate_nodl(data, decl, scope)) {
 148                 return false;
 149         }
 150         if (!psi_decl_validate_func(data, decl, decl->func)) {
 151                 return false;
 152         }
 153
 154         return true;
 155 }
 156
 157 bool psi_decl_validate_nodl(struct psi_data *data, struct psi_decl *decl,
 158                 struct psi_validate_scope *scope)
 159 {
 160         if (!decl->abi) {
 161                 decl->abi = psi_decl_abi_init(zend_string_init(ZEND_STRL("default"), 1));
 162         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 163                 data->error(data, decl->abi->token, PSI_WARNING,
 164                                 "Invalid calling convention: '%s'", decl->abi->token->text->val);
 165                 return false;
 166         }
 167         if (!psi_decl_arg_validate(data, decl->func, scope)) {
 168                 return false;
 169         }
 170         if (decl->args) {
 171                 size_t i = 0;
 172                 struct psi_decl_arg *arg;
 173
 174                 while (psi_plist_get(decl->args, i++, &arg)) {
 175                         if (!arg->var->name) {
 176                                 smart_str name = {0};
 177
 178                                 smart_str_appendl_ex(&name, ZEND_STRL("arg"), 1);
 179                                 smart_str_append_unsigned_ex(&name, i, 1);
 180
 181                                 arg->var->name = smart_str_extract(&name);
 182                                 arg->var->fqn = zend_string_copy(arg->var->name);
 183                         }
 184                         if (!psi_decl_arg_validate(data, arg, scope)) {
 185                                 return false;
 186                         }
 187                 }
 188         }
 189
 190         return true;
 191 }
 192
 193 bool psi_decl_is_blacklisted(const char *name)
 194 {
 195         char *blacklisted;
 196         size_t i = 0;
 197
 198         while (psi_plist_get(PSI_G(blacklist).decls, i++, &blacklisted)) {
 199                 if (!fnmatch(blacklisted, name, 0)) {
 200                         return true;
 201                 }
 202         }
 203         return false;
 204 }
 205
 206 struct psi_decl_arg *psi_decl_get_arg(struct psi_decl *decl, struct psi_decl_var *var) {
 207         if (var->arg) {
 208                 size_t i = 0;
 209                 struct psi_decl_arg *arg = decl->func;
 210
 211                 do {
 212                         if (var->arg == arg) {
 213                                 return arg;
 214                         }
 215                 } while (psi_plist_get(decl->args, i++, &arg));
 216         }
 217
 218         return psi_decl_arg_get_by_var(var, decl->args, decl->func);
 219 }
 220