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, "Cannot load anonymous decl");
  90                 return false;
  91         }
  92
  93         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
  94                 if (!strcmp(func->var->name, redir->name)) {
  95                         decl->sym = redir->func;
  96                 }
  97         }
  98         if (!decl->sym) {
  99 #ifndef RTLD_NEXT
 100 # define RTLD_NEXT ((void *) -1l)
 101 #endif
 102 #ifndef RTLD_DEFAULT
 103 # define RTLD_DEFAULT ((void *) 0)
 104 #endif
 105                 decl->sym = dlsym(dl ?: RTLD_DEFAULT, func->var->name);
 106                 if (!decl->sym) {
 107                         data->error(data, func->token, PSI_WARNING,
 108                                         "Failed to locate symbol '%s': %s", func->var->name,
 109                                         dlerror() ?: "not found");
 110                         return false;
 111                 }
 112         }
 113         return true;
 114 }
 115
 116 bool psi_decl_validate(struct psi_data *data, struct psi_decl *decl, void *dl,
 117                 struct psi_validate_stack *type_stack)
 118 {
 119         if (!psi_decl_validate_nodl(data, decl, type_stack)) {
 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                 struct psi_validate_stack *type_stack)
 131 {
 132         if (!decl->abi) {
 133                 decl->abi = psi_decl_abi_init("default");
 134         } else if (!psi_decl_abi_validate(data, decl->abi)) {
 135                 data->error(data, decl->abi->token, PSI_WARNING,
 136                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 137                 return false;
 138         }
 139         if (!psi_decl_arg_validate(data, decl->func, type_stack)) {
 140                 return false;
 141         }
 142         if (decl->args) {
 143                 size_t i = 0;
 144                 struct psi_decl_arg *arg;
 145
 146                 while (psi_plist_get(decl->args, i++, &arg)) {
 147                         if (!arg->var->name) {
 148                                 arg->var->name = malloc(7);
 149                                 snprintf(arg->var->name, 6, "arg%zu", i);
 150                                 arg->var->fqn = strdup(arg->var->name);
 151                         }
 152                         if (!psi_decl_arg_validate(data, arg, type_stack)) {
 153                                 return false;
 154                         }
 155                 }
 156         }
 157
 158         return true;
 159 }