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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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131
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9 -- Copyright (C) 1999-2018, 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 -- This version uses System.Machine_State_Operations routines
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33
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34 with System.Machine_State_Operations;
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35
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36 package body System.Traceback is
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37
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38 use System.Machine_State_Operations;
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39
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40 procedure Call_Chain
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41 (Traceback : System.Address;
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42 Max_Len : Natural;
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43 Len : out Natural;
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44 Exclude_Min : System.Address := System.Null_Address;
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45 Exclude_Max : System.Address := System.Null_Address;
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46 Skip_Frames : Natural := 1);
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47 -- Same as the exported version, but takes Traceback as an Address
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48
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49 ----------------
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50 -- Call_Chain --
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51 ----------------
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52
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53 procedure Call_Chain
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54 (Traceback : System.Address;
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55 Max_Len : Natural;
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56 Len : out Natural;
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57 Exclude_Min : System.Address := System.Null_Address;
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58 Exclude_Max : System.Address := System.Null_Address;
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59 Skip_Frames : Natural := 1)
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60 is
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61 type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
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62 pragma Suppress_Initialization (Tracebacks_Array);
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63
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64 M : Machine_State;
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65 Code : Code_Loc;
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66
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67 Trace : Tracebacks_Array;
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68 for Trace'Address use Traceback;
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69
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70 N_Skips : Natural := 0;
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71
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72 begin
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73 M := Allocate_Machine_State;
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74 Set_Machine_State (M);
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75
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76 -- Skip the requested number of frames
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77
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78 loop
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79 Code := Get_Code_Loc (M);
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80 exit when Code = Null_Address or else N_Skips = Skip_Frames;
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81
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82 Pop_Frame (M);
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83 N_Skips := N_Skips + 1;
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84 end loop;
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85
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86 -- Now, record the frames outside the exclusion bounds, updating
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87 -- the Len output value along the way.
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88
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89 Len := 0;
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90 loop
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91 Code := Get_Code_Loc (M);
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92 exit when Code = Null_Address or else Len = Max_Len;
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93
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94 if Code < Exclude_Min or else Code > Exclude_Max then
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95 Len := Len + 1;
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96 Trace (Len) := Code;
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97 end if;
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98
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99 Pop_Frame (M);
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100 end loop;
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101
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102 Free_Machine_State (M);
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103 end Call_Chain;
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104
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105 procedure Call_Chain
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106 (Traceback : in out System.Traceback_Entries.Tracebacks_Array;
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107 Max_Len : Natural;
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108 Len : out Natural;
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109 Exclude_Min : System.Address := System.Null_Address;
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110 Exclude_Max : System.Address := System.Null_Address;
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111 Skip_Frames : Natural := 1)
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112 is
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113 begin
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114 Call_Chain
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115 (Traceback'Address, Max_Len, Len,
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116 Exclude_Min, Exclude_Max,
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117
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118 -- Skip one extra frame to skip the other Call_Chain entry as well
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119
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120 Skip_Frames => Skip_Frames + 1);
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121 end Call_Chain;
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122
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123 ------------------
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124 -- C_Call_Chain --
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125 ------------------
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126
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127 function C_Call_Chain
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128 (Traceback : System.Address;
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129 Max_Len : Natural) return Natural
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130 is
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131 Val : Natural;
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132 begin
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133 Call_Chain (Traceback, Max_Len, Val);
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134 return Val;
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135 end C_Call_Chain;
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136
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137 end System.Traceback;
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