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 (!func->var->name) {
  89                 data->error(data, func->token, PSI_WARNING, "Anonymous decl!");
  90                 return false;
  91         }
  92         if (!strcmp(func->var->name, "dlsym")) {
  93                 data->error(data, func->token, PSI_WARNING,
  94                                 "Cannot dlsym dlsym (sic!)");
  95                 return false;
  96         }
  97
  98         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
  99                 if (!strcmp(func->var->name, redir->name)) {
 100                         decl->sym = redir->func;
 101                 }
 102         }
 103         if (!decl->sym) {
 104 #ifndef RTLD_NEXT
 105 # define RTLD_NEXT ((void *) -1l)
 106 #endif
 107 #ifndef RTLD_DEFAULT
 108 # define RTLD_DEFAULT ((void *) 0)
 109 #endif
 110                 decl->sym = dlsym(dl ?: RTLD_DEFAULT, 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                 struct psi_validate_stack *type_stack)
 123 {
 124         if (!psi_decl_validate_nodl(data, decl, type_stack)) {
 125                 return false;
 126         }
 127         if (!psi_decl_validate_func(data, decl, decl->func, dl)) {
 128                 return false;
 129         }
 130
 131         return true;
 132 }
 133
 134 bool psi_decl_validate_nodl(struct psi_data *data, struct psi_decl *decl,
 135                 struct psi_validate_stack *type_stack)
 136 {
 137         if (!decl->abi) {
 138                 decl->abi = psi_decl_abi_init("default");
 139         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 140                 data->error(data, decl->abi->token, PSI_WARNING,
 141                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 142                 return false;
 143         }
 144         if (!psi_decl_arg_validate(data, decl->func, type_stack)) {
 145                 return false;
 146         }
 147         if (decl->args) {
 148                 size_t i = 0;
 149                 struct psi_decl_arg *arg;
 150
 151                 while (psi_plist_get(decl->args, i++, &arg)) {
 152                         if (!arg->var->name) {
 153                                 arg->var->name = malloc(7);
 154                                 snprintf(arg->var->name, 6, "arg%zu", i);
 155                                 arg->var->fqn = strdup(arg->var->name);
 156                         }
 157                         if (!psi_decl_arg_validate(data, arg, type_stack)) {
 158                                 return false;
 159                         }
 160                 }
 161         }
 162
 163         return true;
 164 }