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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 -- S Y S T E M . E X C E P T I O N _ T R A C E S --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 2000-2019, 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 Ada.Unchecked_Conversion;
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33
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34 with System.Standard_Library; use System.Standard_Library;
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35 with System.Soft_Links; use System.Soft_Links;
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36
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37 package body System.Exception_Traces is
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38
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39 -- Calling the decorator directly from where it is needed would require
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40 -- introducing nasty dependencies upon the spec of this package (typically
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41 -- in a-except.adb). We also have to deal with the fact that the traceback
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42 -- array within an exception occurrence and the one the decorator accepts
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43 -- are of different types. These are two reasons for which a wrapper with
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44 -- a System.Address argument is indeed used to call the decorator provided
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45 -- by the user of this package. This wrapper is called via a soft-link,
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46 -- which either is null when no decorator is in place or "points to" the
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47 -- following function otherwise.
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48
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49 function Decorator_Wrapper
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50 (Traceback : System.Address;
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51 Len : Natural) return String;
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52 -- The wrapper to be called when a decorator is in place for exception
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53 -- backtraces.
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54 --
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55 -- Traceback is the address of the call chain array as stored in the
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56 -- exception occurrence and Len is the number of significant addresses
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57 -- contained in this array.
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58
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59 Current_Decorator : Traceback_Decorator := null;
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60 -- The decorator to be called by the wrapper when it is not null, as set
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61 -- by Set_Trace_Decorator. When this access is null, the wrapper is null
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62 -- also and shall then not be called.
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63
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64 -----------------------
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65 -- Decorator_Wrapper --
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66 -----------------------
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67
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68 function Decorator_Wrapper
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69 (Traceback : System.Address;
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70 Len : Natural) return String
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71 is
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72 subtype Trace_Array is Traceback_Entries.Tracebacks_Array (1 .. Len);
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73 type Trace_Array_Access is access all Trace_Array;
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74
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75 function To_Trace_Array is new
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76 Ada.Unchecked_Conversion (Address, Trace_Array_Access);
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77
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78 Decorator_Traceback : constant Trace_Array_Access :=
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79 To_Trace_Array (Traceback);
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80
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81 begin
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82 return Current_Decorator.all (Decorator_Traceback.all);
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83 end Decorator_Wrapper;
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84
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85 -------------------------
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86 -- Set_Trace_Decorator --
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87 -------------------------
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88
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89 procedure Set_Trace_Decorator (Decorator : Traceback_Decorator) is
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90 begin
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91 Current_Decorator := Decorator;
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92 Traceback_Decorator_Wrapper :=
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93 (if Current_Decorator /= null
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94 then Decorator_Wrapper'Access else null);
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95 end Set_Trace_Decorator;
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96
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97 ---------------
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98 -- Trace_Off --
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99 ---------------
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100
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101 procedure Trace_Off is
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102 begin
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103 Exception_Trace := RM_Convention;
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104 end Trace_Off;
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105
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106 --------------
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107 -- Trace_On --
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108 --------------
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109
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110 procedure Trace_On (Kind : Trace_Kind) is
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111 begin
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112 case Kind is
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113 when Every_Raise =>
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114 Exception_Trace := Every_Raise;
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115
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116 when Unhandled_Raise =>
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117 Exception_Trace := Unhandled_Raise;
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118
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119 when Unhandled_Raise_In_Main =>
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120 Exception_Trace := Unhandled_Raise_In_Main;
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121 end case;
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122 end Trace_On;
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123
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124 end System.Exception_Traces;
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