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(NULL);
 162         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 163                 data->error(data, decl->abi->token, PSI_WARNING,
 164                                 "Invalid calling convention: '%s'",
 165                                 decl->abi->token->text->val);
 166                 return false;
 167         }
 168         if (!psi_decl_arg_validate(data, decl->func, scope)) {
 169                 return false;
 170         }
 171         if (decl->args) {
 172                 size_t i = 0;
 173                 struct psi_decl_arg *arg;
 174
 175                 while (psi_plist_get(decl->args, i++, &arg)) {
 176                         if (!arg->var->name) {
 177                                 smart_str name = {0};
 178
 179                                 smart_str_appendl_ex(&name, ZEND_STRL("arg"), 1);
 180                                 smart_str_append_unsigned_ex(&name, i, 1);
 181
 182                                 arg->var->name = smart_str_extract(&name);
 183                                 arg->var->fqn = zend_string_copy(arg->var->name);
 184                         }
 185                         if (!psi_decl_arg_validate(data, arg, scope)) {
 186                                 return false;
 187                         }
 188                 }
 189         }
 190
 191         return true;
 192 }
 193
 194 bool psi_decl_is_blacklisted(const char *name)
 195 {
 196         char *blacklisted;
 197         size_t i = 0;
 198
 199         while (psi_plist_get(PSI_G(blacklist).decls, i++, &blacklisted)) {
 200                 if (!fnmatch(blacklisted, name, 0)) {
 201                         return true;
 202                 }
 203         }
 204         return false;
 205 }
 206
 207 struct psi_decl_arg *psi_decl_get_arg(struct psi_decl *decl, struct psi_decl_var *var) {
 208         if (var->arg) {
 209                 size_t i = 0;
 210                 struct psi_decl_arg *arg = decl->func;
 211
 212                 do {
 213                         if (var->arg == arg) {
 214                                 return arg;
 215                         }
 216                 } while (psi_plist_get(decl->args, i++, &arg));
 217         }
 218
 219         return psi_decl_arg_get_by_var(var, decl->args, decl->func);
 220 }
 221