Trampoline.t.cpp

   1 /* Cycript - Optimizing JavaScript Compiler/Runtime
   2  * Copyright (C) 2009-2010  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU Lesser General Public License, Version 3 {{{ */
   6 /*
   7  * Cycript is free software: you can redistribute it and/or modify it under
   8  * the terms of the GNU Lesser General Public License as published by the
   9  * Free Software Foundation, either version 3 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * Cycript is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15  * License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #define _PTHREAD_ATTR_T
  23 #include <pthread_internals.h>
  24
  25 #include "Standard.hpp"
  26 #include "Baton.hpp"
  27
  28 template <typename Type_>
  29 static _finline void dlset(Baton *baton, Type_ &function, const char *name, void *handle = RTLD_DEFAULT) {
  30     function = reinterpret_cast<Type_>(baton->dlsym(handle, name));
  31     if (function == NULL)
  32         baton->dlerror();
  33 }
  34
  35 #define Framework(framework) \
  36     "/System/Library/Frameworks/" #framework ".framework/" #framework
  37
  38 void *Routine(void *arg) {
  39     Baton *baton(reinterpret_cast<Baton *>(arg));
  40
  41     void *(*dlopen)(const char *, int);
  42     dlset(baton, dlopen, "dlopen");
  43
  44     if (baton->dlsym(RTLD_DEFAULT, "JSEvaluateScript") == NULL)
  45         dlopen(Framework(JavaScriptCore), RTLD_GLOBAL | RTLD_LAZY);
  46
  47     void *(*objc_getClass)(const char *);
  48     dlset(baton, objc_getClass, "objc_getClass");
  49
  50     if (objc_getClass("WebUndefined") == NULL)
  51         dlopen(Framework(WebKit), RTLD_GLOBAL | RTLD_LAZY);
  52
  53     void *handle(dlopen(baton->library, RTLD_LAZY | RTLD_LOCAL));
  54     if (handle == NULL) {
  55         baton->dlerror();
  56         return NULL;
  57     }
  58
  59     void (*CYHandleServer)(pid_t);
  60     dlset(baton, CYHandleServer, "CYHandleServer", handle);
  61
  62     CYHandleServer(baton->pid);
  63
  64     return NULL;
  65 }
  66
  67 static void $bzero(void *data, size_t size) {
  68     char *bytes(reinterpret_cast<char *>(data));
  69     for (size_t i(0); i != size; ++i)
  70         bytes[i] = 0;
  71 }
  72
  73 extern "C" void Start(Baton *baton) {
  74     struct _pthread self;
  75     $bzero(&self, sizeof(self));
  76
  77     // this code comes from _pthread_set_self
  78     self.tsd[0] = &self;
  79     baton->__pthread_set_self(&self);
  80
  81     int (*pthread_create)(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *);
  82     dlset(baton, pthread_create, "pthread_create");
  83
  84     pthread_t thread;
  85     baton->pthread_create(&thread, NULL, &Routine, baton);
  86
  87     int (*pthread_join)(pthread_t, void **);
  88     dlset(baton, pthread_join, "pthread_join");
  89
  90     void *result;
  91     baton->pthread_join(thread, &result);
  92
  93     mach_port_t (*mach_thread_self)();
  94     dlset(baton, mach_thread_self, "mach_thread_self");
  95
  96     kern_return_t (*thread_terminate)(thread_act_t);
  97     dlset(baton, thread_terminate, "thread_terminate");
  98
  99     baton->thread_terminate(baton->mach_thread_self());
 100 }