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 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #else
  29 # include "php_config.h"
  30 #endif
  31
  32 #if __GNUC__ >= 5
  33 # pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
  34 #endif
  35 #include "php_psi_macros.h"
  36 #include "php_psi_redirs.h"
  37 #if __GNUC__ >= 5
  38 # pragma GCC diagnostic pop
  39 #endif
  40
  41 #include <stdlib.h>
  42 #include <stdio.h>
  43 #include <sys/param.h>
  44 #include <dlfcn.h>
  45
  46 #include "data.h"
  47
  48 decl *init_decl(decl_abi *abi, decl_arg *func, decl_args *args) {
  49         decl *d = calloc(1, sizeof(*d));
  50         d->abi = abi;
  51         d->func = func;
  52         d->args = args;
  53         return d;
  54 }
  55
  56 void free_decl(decl *d) {
  57         free_decl_abi(d->abi);
  58         free_decl_arg(d->func);
  59         if (d->args) {
  60                 free_decl_args(d->args);
  61         }
  62         free(d);
  63 }
  64
  65 void dump_decl(int fd, decl *decl) {
  66         dump_decl_abi(fd, decl->abi);
  67         dprintf(fd, " ");
  68         dump_decl_arg(fd, decl->func, 0);
  69         dprintf(fd, "(");
  70         if (decl->args) {
  71                 dump_decl_args(fd, decl->args, 0);
  72         }
  73         dprintf(fd, ");");
  74 }
  75
  76 static inline int validate_decl_func(struct psi_data *data, void *dl, decl *decl, decl_arg *func)
  77 {
  78         struct psi_func_redir *redir;
  79
  80         if (!strcmp(func->var->name, "dlsym")) {
  81                 data->error(data, func->token, PSI_WARNING, "Cannot dlsym dlsym (sic!)");
  82                 return 0;
  83         }
  84
  85         for (redir = &psi_func_redirs[0]; redir->name; ++redir) {
  86                 if (!strcmp(func->var->name, redir->name)) {
  87                         decl->call.sym = redir->func;
  88                 }
  89         }
  90         if (!decl->call.sym) {
  91 #ifndef RTLD_NEXT
  92 # define RTLD_NEXT ((void *) -1l)
  93 #endif
  94                 decl->call.sym = dlsym(dl ?: RTLD_NEXT, func->var->name);
  95                 if (!decl->call.sym) {
  96                         data->error(data, func->token, PSI_WARNING,
  97                                 "Failed to locate symbol '%s': %s",
  98                                 func->var->name, dlerror() ?: "not found");
  99                 }
 100         }
 101         return 1;
 102 }
 103
 104 int validate_decl(struct psi_data *data, void *dl, decl *decl) {
 105         if (!validate_decl_nodl(data, decl)) {
 106                 return 0;
 107         }
 108         if (!validate_decl_func(data, dl, decl, decl->func)) {
 109                 return 0;
 110         }
 111         return 1;
 112 }
 113
 114 int validate_decl_nodl(struct psi_data *data, decl *decl) {
 115         if (!validate_decl_abi(data, decl->abi)) {
 116                 data->error(data, decl->abi->token, PSI_WARNING,
 117                                 "Invalid calling convention: '%s'", decl->abi->token->text);
 118                 return 0;
 119         }
 120         if (!validate_decl_arg(data, decl->func)) {
 121                 return 0;
 122         }
 123         if (decl->args) {
 124                 size_t i;
 125
 126                 for (i = 0; i < decl->args->count; ++i) {
 127                         if (!validate_decl_arg(data, decl->args->args[i])) {
 128                                 return 0;
 129                         }
 130                 }
 131         }
 132         return 1;
 133 }