annotate gcc/ada/libgnat/s-traceb.adb @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . T R A C E B A C K --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1999-2018, Free Software Foundation, Inc. --
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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 -- This is the default version of this package
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33
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34 -- Note: this unit must be compiled using -fno-optimize-sibling-calls.
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35 -- See comment below in body of Call_Chain for details on the reason.
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36
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37 pragma Compiler_Unit_Warning;
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38
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39 package body System.Traceback is
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40
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41 procedure Call_Chain
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42 (Traceback : System.Address;
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43 Max_Len : Natural;
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44 Len : out Natural;
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45 Exclude_Min : System.Address := System.Null_Address;
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46 Exclude_Max : System.Address := System.Null_Address;
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47 Skip_Frames : Natural := 1);
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48 -- Same as the exported version, but takes Traceback as an Address
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49
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50 ------------------
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51 -- C_Call_Chain --
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52 ------------------
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53
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54 function C_Call_Chain
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55 (Traceback : System.Address;
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56 Max_Len : Natural) return Natural
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57 is
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58 Val : Natural;
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59 begin
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60 Call_Chain (Traceback, Max_Len, Val);
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61 return Val;
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62 end C_Call_Chain;
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63
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64 ----------------
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65 -- Call_Chain --
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66 ----------------
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67
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68 function Backtrace
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69 (Traceback : System.Address;
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70 Len : Integer;
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71 Exclude_Min : System.Address;
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72 Exclude_Max : System.Address;
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73 Skip_Frames : Integer)
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74 return Integer;
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75 pragma Import (C, Backtrace, "__gnat_backtrace");
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76
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77 procedure Call_Chain
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78 (Traceback : System.Address;
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79 Max_Len : Natural;
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80 Len : out Natural;
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81 Exclude_Min : System.Address := System.Null_Address;
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82 Exclude_Max : System.Address := System.Null_Address;
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83 Skip_Frames : Natural := 1)
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84 is
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85 begin
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86 -- Note: Backtrace relies on the following call actually creating a
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87 -- stack frame. To ensure that this is the case, it is essential to
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88 -- compile this unit without sibling call optimization.
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89
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90 -- We want the underlying engine to skip its own frame plus the
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91 -- ones we have been requested to skip ourselves.
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92
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93 Len := Backtrace (Traceback => Traceback,
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94 Len => Max_Len,
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95 Exclude_Min => Exclude_Min,
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96 Exclude_Max => Exclude_Max,
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97 Skip_Frames => Skip_Frames + 1);
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98 end Call_Chain;
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99
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100 procedure Call_Chain
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101 (Traceback : in out System.Traceback_Entries.Tracebacks_Array;
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102 Max_Len : Natural;
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103 Len : out Natural;
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104 Exclude_Min : System.Address := System.Null_Address;
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105 Exclude_Max : System.Address := System.Null_Address;
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106 Skip_Frames : Natural := 1)
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107 is
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108 begin
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109 Call_Chain
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110 (Traceback'Address, Max_Len, Len,
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111 Exclude_Min, Exclude_Max,
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112
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113 -- Skip one extra frame to skip the other Call_Chain entry as well
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114
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115 Skip_Frames => Skip_Frames + 1);
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116 end Call_Chain;
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117
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118 end System.Traceback;