auxhelper.cc

   1 /*
   2  * Copyright 2010-2011 PathScale, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * 1. Redistributions of source code must retain the above copyright notice,
   8  *    this list of conditions and the following disclaimer.
   9  *
  10  * 2. Redistributions in binary form must reproduce the above copyright notice,
  11  *    this list of conditions and the following disclaimer in the documentation
  12  *    and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
  15  * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  16  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  21  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /**
  28  * aux.cc - Compiler helper functions.
  29  *
  30  * The functions declared in this file are intended to be called only by code
  31  * that is automatically generated by C++ compilers for some common cases.
  32  */
  33
  34 #include <stdlib.h>
  35 #include "stdexcept.h"
  36
  37 namespace {
  38         /**
  39          * Throw an exception if we're compiling with exceptions, otherwise abort.
  40          */
  41         template<typename T>
  42         void throw_exception()
  43         {
  44 #if !defined(_CXXRT_NO_EXCEPTIONS)
  45                 throw T();
  46 #else
  47                 abort();
  48 #endif
  49         }
  50 }
  51
  52 /**
  53  * Called to generate a bad cast exception.  This function is intended to allow
  54  * compilers to insert code generating this exception without needing to
  55  * duplicate the code for throwing the exception in every call site.
  56  */
  57 extern "C" void __cxa_bad_cast()
  58 {
  59         throw_exception<std::bad_cast>();
  60 }
  61
  62 /**
  63  * Called to generate a bad typeid exception.  This function is intended to
  64  * allow compilers to insert code generating this exception without needing to
  65  * duplicate the code for throwing the exception in every call site.
  66  */
  67 extern "C" void __cxa_bad_typeid()
  68 {
  69         throw_exception<std::bad_typeid>();
  70 }
  71
  72 /**
  73  * Compilers may (but are not required to) set any pure-virtual function's
  74  * vtable entry to this function.  This makes debugging slightly easier, as
  75  * users can add a breakpoint on this function to tell if they've accidentally
  76  * called a pure-virtual function.
  77  */
  78 extern "C" void __cxa_pure_virtual()
  79 {
  80         abort();
  81 }
  82
  83 /**
  84  * Compilers may (but are not required to) set any deleted-virtual function's
  85  * vtable entry to this function.  This makes debugging slightly easier, as
  86  * users can add a breakpoint on this function to tell if they've accidentally
  87  * called a deleted-virtual function.
  88  */
  89 extern "C" void __cxa_deleted_virtual()
  90 {
  91         abort();
  92 }
  93
  94 extern "C" void __cxa_throw_bad_array_new_length()
  95 {
  96         throw_exception<std::bad_array_new_length>();
  97 }