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 #if __GNUC__ >= 5
  29 # pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
  30 #endif
  31 #include "php_psi_macros.h"
  32 #include "php_psi_redirs.h"
  33 #if __GNUC__ >= 5
  34 # pragma GCC diagnostic pop
  35 #endif
  36
  37 #include <dlfcn.h>
  38
  39 #include "data.h"
  40
  41 struct psi_decl *psi_decl_init(struct psi_decl_abi *abi,
  42                 struct psi_decl_arg *func, struct psi_plist *args)
  43 {
  44         struct psi_decl *d = calloc(1, sizeof(*d));
  45         d->abi = abi;
  46         d->func = func;
  47         d->args = args;
  48         return d;
  49 }
  50
  51 void psi_decl_free(struct psi_decl **d_ptr)
  52 {
  53         if (*d_ptr) {
  54                 struct psi_decl *d = *d_ptr;
  55
  56                 *d_ptr = NULL;
  57
  58                 psi_decl_abi_free(&d->abi);
  59                 psi_decl_arg_free(&d->func);
  60                 if (d->args) {
  61                         psi_plist_free(d->args);
  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         psi_decl_arg_dump(fd, decl->func, 0);
  72         dprintf(fd, "(");
  73         if (decl->args) {
  74                 size_t i;
  75                 struct psi_decl_arg *arg;
  76
  77                 for (i = 0; psi_plist_get(decl->args, i, &arg); ++i) {
  78                         if (i) {
  79                                 dprintf(fd, ", ");
  80                         }
  81                         psi_decl_arg_dump(fd, arg, 0);
  82                 }
  83                 if (decl->varargs) {
  84                         dprintf(fd, ", ...");
  85                 }
  86         }
  87         dprintf(fd, ");");
  88 }
  89
  90 static inline bool psi_decl_validate_func(struct psi_data *data,
  91                 struct psi_decl *decl, struct psi_decl_arg *func, void *dl)
  92 {
  93         struct psi_func_redir *redir;
  94
  95         if (!strcmp(func->var->name, "dlsym")) {
  96                 data->error(data, func->token, PSI_WARNING,
  97                                 "Cannot dlsym dlsym (sic!)");
  98                 return false;
  99         }
 100
 101         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
 102                 if (!strcmp(func->var->name, redir->name)) {
 103                         decl->sym = redir->func;
 104                 }
 105         }
 106         if (!decl->sym) {
 107 #ifndef RTLD_NEXT
 108 # define RTLD_NEXT ((void *) -1l)
 109 #endif
 110                 decl->sym = dlsym(dl ?: RTLD_NEXT, func->var->name);
 111                 if (!decl->sym) {
 112                         data->error(data, func->token, PSI_WARNING,
 113                                         "Failed to locate symbol '%s': %s", func->var->name,
 114                                         dlerror() ?: "not found");
 115                         return false;
 116                 }
 117         }
 118         return true;
 119 }
 120
 121 bool psi_decl_validate(struct psi_data *data, struct psi_decl *decl, void *dl)
 122 {
 123         if (!psi_decl_validate_nodl(data, decl)) {
 124                 return false;
 125         }
 126         if (!psi_decl_validate_func(data, decl, decl->func, dl)) {
 127                 return false;
 128         }
 129
 130         return true;
 131 }
 132
 133 bool psi_decl_validate_nodl(struct psi_data *data, struct psi_decl *decl)
 134 {
 135         if (!psi_decl_abi_validate(data, decl->abi)) {
 136                 data->error(data, decl->abi->token, PSI_WARNING,
 137                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 138                 return false;
 139         }
 140         if (!psi_decl_arg_validate(data, decl->func)) {
 141                 return false;
 142         }
 143         if (decl->args) {
 144                 size_t i = 0;
 145                 struct psi_decl_arg *arg;
 146
 147                 while (psi_plist_get(decl->args, i++, &arg)) {
 148                         if (!psi_decl_arg_validate(data, arg)) {
 149                                 return false;
 150                         }
 151                 }
 152         }
 153
 154         return true;
 155 }