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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- G N A T . C P P _ E X C E P T I O N S --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2013-2018, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with System;
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33 with System.Storage_Elements;
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34 with Interfaces.C; use Interfaces.C;
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35 with Ada.Unchecked_Conversion;
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36 with System.Standard_Library; use System.Standard_Library;
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37
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38 package body GNAT.CPP_Exceptions is
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39
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40 -- Note: all functions prefixed by __cxa are part of the c++ ABI for
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41 -- exception handling. As they are provided by the c++ library, there
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42 -- must be no dependencies on it in the compiled code of this unit, but
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43 -- there can be dependencies in instances. This is required to be able
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44 -- to build the shared library without the c++ library.
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45
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46 function To_Exception_Data_Ptr is new
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47 Ada.Unchecked_Conversion
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48 (Exception_Id, Exception_Data_Ptr);
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49 -- Convert an Exception_Id to its non-private type. This is used to get
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50 -- the RTTI of a C++ exception
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51
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52 function Get_Exception_Machine_Occurrence
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53 (X : Exception_Occurrence) return System.Address;
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54 pragma Import (Ada, Get_Exception_Machine_Occurrence,
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55 "__gnat_get_exception_machine_occurrence");
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56 -- Imported function (from Ada.Exceptions) that returns the machine
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57 -- occurrence from an exception occurrence.
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58
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59 -------------------------
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60 -- Raise_Cpp_Exception --
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61 -------------------------
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62
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63 procedure Raise_Cpp_Exception (Id : Exception_Id; Value : T)
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64 is
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65 Id_Data : constant Exception_Data_Ptr := To_Exception_Data_Ptr (Id);
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66 -- Get a non-private view on the exception
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67
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68 type T_Acc is access all T;
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69 pragma Convention (C, T_Acc);
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70 -- Access type to the object compatible with C
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71
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72 Occ : T_Acc;
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73 -- The occurrence to propagate
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74
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75 function cxa_allocate_exception (Size : size_t) return T_Acc;
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76 pragma Import (C, cxa_allocate_exception, "__cxa_allocate_exception");
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77 -- The C++ function to allocate an occurrence
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78
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79 procedure cxa_throw (Obj : T_Acc; Tinfo : System.Address;
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80 Dest : System.Address);
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81 pragma Import (C, cxa_throw, "__cxa_throw");
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82 pragma No_Return (cxa_throw);
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83 -- The C++ function to raise an exception
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84 begin
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85 -- Check the exception was imported from C++
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86
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87 if Id_Data.Lang /= 'C' then
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88 raise Constraint_Error;
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89 end if;
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90
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91 -- Allocate the C++ occurrence
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92
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93 Occ := cxa_allocate_exception (T'Size / System.Storage_Unit);
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94
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95 -- Set the object
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96
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97 Occ.all := Value;
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98
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99 -- Throw the exception
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100
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101 cxa_throw (Occ, Id_Data.Foreign_Data, System.Null_Address);
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102 end Raise_Cpp_Exception;
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103
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104 ----------------
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105 -- Get_Object --
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106 ----------------
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107
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108 function Get_Object (X : Exception_Occurrence) return T
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109 is
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110 use System;
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111 use System.Storage_Elements;
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112
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113 Unwind_Exception_Size : Natural;
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114 pragma Import (C, Unwind_Exception_Size, "__gnat_unwind_exception_size");
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115 -- Size in bytes of _Unwind_Exception
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116
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117 Exception_Addr : constant Address :=
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118 Get_Exception_Machine_Occurrence (X);
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119 -- Machine occurrence of X
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120
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121 begin
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122 -- Check the machine occurrence exists
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123
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124 if Exception_Addr = Null_Address then
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125 raise Constraint_Error;
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126 end if;
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127
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128 declare
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129 -- Import the object from the occurrence
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130 Result : T;
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131 pragma Import (Ada, Result);
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132 for Result'Address use
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133 Exception_Addr + Storage_Offset (Unwind_Exception_Size);
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134 begin
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135 -- And return it
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136 return Result;
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137 end;
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138 end Get_Object;
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139 end GNAT.CPP_Exceptions;
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