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 <dlfcn.h>
  29 #include "data.h"
  30
  31 #define PSI_FUNC_REDIRS
  32 #include "php_psi_posix.h"
  33
  34 struct psi_decl *psi_decl_init(struct psi_decl_arg *func, struct psi_plist *args)
  35 {
  36         struct psi_decl *d = calloc(1, sizeof(*d));
  37
  38         d->func = func;
  39         d->args = args;
  40
  41         return d;
  42 }
  43
  44 void psi_decl_free(struct psi_decl **d_ptr)
  45 {
  46         if (*d_ptr) {
  47                 struct psi_decl *d = *d_ptr;
  48
  49                 *d_ptr = NULL;
  50
  51                 psi_decl_abi_free(&d->abi);
  52                 psi_decl_arg_free(&d->func);
  53                 if (d->args) {
  54                         psi_plist_free(d->args);
  55                 }
  56                 free(d);
  57         }
  58 }
  59
  60 void psi_decl_dump(int fd, struct psi_decl *decl)
  61 {
  62         psi_decl_abi_dump(fd, decl->abi);
  63         dprintf(fd, " ");
  64         psi_decl_arg_dump(fd, decl->func, 0);
  65         dprintf(fd, "(");
  66         if (decl->args) {
  67                 size_t i;
  68                 struct psi_decl_arg *arg;
  69
  70                 for (i = 0; psi_plist_get(decl->args, i, &arg); ++i) {
  71                         if (i) {
  72                                 dprintf(fd, ", ");
  73                         }
  74                         psi_decl_arg_dump(fd, arg, 0);
  75                 }
  76                 if (decl->varargs) {
  77                         dprintf(fd, ", ...");
  78                 }
  79         }
  80         dprintf(fd, ");");
  81 }
  82
  83 static inline bool psi_decl_validate_func(struct psi_data *data,
  84                 struct psi_decl *decl, struct psi_decl_arg *func, void *dl)
  85 {
  86         struct psi_func_redir *redir;
  87
  88         if (!strcmp(func->var->name, "dlsym")) {
  89                 data->error(data, func->token, PSI_WARNING,
  90                                 "Cannot dlsym dlsym (sic!)");
  91                 return false;
  92         }
  93
  94         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
  95                 if (!strcmp(func->var->name, redir->name)) {
  96                         decl->sym = redir->func;
  97                 }
  98         }
  99         if (!decl->sym) {
 100 #ifndef RTLD_NEXT
 101 # define RTLD_NEXT ((void *) -1l)
 102 #endif
 103 #ifndef RTLD_DEFAULT
 104 # define RTLD_DEFAULT ((void *) 0)
 105 #endif
 106                 decl->sym = dlsym(dl ?: RTLD_DEFAULT, func->var->name);
 107                 if (!decl->sym) {
 108                         data->error(data, func->token, PSI_WARNING,
 109                                         "Failed to locate symbol '%s': %s", func->var->name,
 110                                         dlerror() ?: "not found");
 111                         return false;
 112                 }
 113         }
 114         return true;
 115 }
 116
 117 bool psi_decl_validate(struct psi_data *data, struct psi_decl *decl, void *dl)
 118 {
 119         if (!psi_decl_validate_nodl(data, decl)) {
 120                 return false;
 121         }
 122         if (!psi_decl_validate_func(data, decl, decl->func, dl)) {
 123                 return false;
 124         }
 125
 126         return true;
 127 }
 128
 129 bool psi_decl_validate_nodl(struct psi_data *data, struct psi_decl *decl)
 130 {
 131         if (!decl->abi) {
 132                 decl->abi = psi_decl_abi_init("default");
 133         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 134                 data->error(data, decl->abi->token, PSI_WARNING,
 135                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 136                 return false;
 137         }
 138         if (!psi_decl_arg_validate(data, decl->func)) {
 139                 return false;
 140         }
 141         if (decl->args) {
 142                 size_t i = 0;
 143                 struct psi_decl_arg *arg;
 144
 145                 while (psi_plist_get(decl->args, i++, &arg)) {
 146                         if (!psi_decl_arg_validate(data, arg)) {
 147                                 return false;
 148                         }
 149                 }
 150         }
 151
 152         return true;
 153 }