hphp/runtime/vm/unwind-inl.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_VM_UNWIND_INL_H_
  18 #error "unwind-inl.h should only be included by unwind.h"
  19 #endif
  20
  21 namespace HPHP {
  22 ///////////////////////////////////////////////////////////////////////////////
  23
  24 template<class Action>
  25 inline bool exception_handler(Action action) {
  26   Trace::Indent _i;
  27   try {
  28     action();
  29     return true;
  30   }
  31
  32   catch (const Object& o) {
  33     checkVMRegState();
  34     ITRACE_MOD(Trace::unwind, 1, "unwind: Object of class {}\n",
  35                o->getVMClass()->name()->data());
  36     assertx(o.get());
  37     if (vmfp() == nullptr) throw;
  38     unwindVM(o.get());
  39     return false;
  40   }
  41
  42   catch (Exception& e) {
  43     checkVMRegState();
  44     ITRACE_MOD(Trace::unwind, 1, "unwind: Exception: {}\n", e.what());
  45     if (vmfp() == nullptr) throw;
  46     unwindVM(e.clone());
  47     not_reached();
  48   }
  49
  50   catch (std::exception& e) {
  51     checkVMRegState();
  52     ITRACE_MOD(Trace::unwind, 1, "unwind: std::exception: {}\n", e.what());
  53     auto const exn =
  54       new Exception("unexpected %s: %s", typeid(e).name(), e.what());
  55     if (vmfp() == nullptr) exn->throwException();
  56     unwindVM(exn);
  57     not_reached();
  58   }
  59
  60   catch (CppDummyException& e) {
  61     always_assert_flog(false,
  62                        "CppDummyException should not reach exception_handler");
  63   }
  64
  65   catch (...) {
  66     checkVMRegState();
  67     ITRACE_MOD(Trace::unwind, 1, "unwind: unknown\n");
  68     auto const exn = new Exception("unknown exception");
  69     if (vmfp() == nullptr) exn->throwException();
  70     unwindVM(exn);
  71     not_reached();
  72   }
  73 }
  74
  75 ///////////////////////////////////////////////////////////////////////////////
  76 }