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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 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1999-2018, Free Software Foundation, Inc. --
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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 package provides a method for generating a traceback of the current
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33 -- execution location. The traceback shows the locations of calls in the call
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34 -- chain, up to either the top or a designated number of levels.
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35
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36 pragma Compiler_Unit_Warning;
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37
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38 pragma Polling (Off);
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39 -- We must turn polling off for this unit, because otherwise we get
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40 -- elaboration circularities with System.Exception_Tables.
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41
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42 with System.Traceback_Entries;
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43
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44 package System.Traceback is
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45
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46 ----------------
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47 -- Call_Chain --
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48 ----------------
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49
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50 procedure Call_Chain
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51 (Traceback : in out System.Traceback_Entries.Tracebacks_Array;
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52 Max_Len : Natural;
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53 Len : out Natural;
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54 Exclude_Min : System.Address := System.Null_Address;
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55 Exclude_Max : System.Address := System.Null_Address;
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56 Skip_Frames : Natural := 1);
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57 -- Store up to Max_Len code locations in Traceback, corresponding to the
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58 -- current call chain.
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59 --
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60 -- Traceback is an array of addresses where the result will be stored.
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61 --
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62 -- Max_Len is the length of the Traceback array. If the call chain is
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63 -- longer than this, then additional entries are discarded, and the
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64 -- traceback is missing some of the highest level entries.
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65 --
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66 -- Len is the number of addresses returned in the Traceback array
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67 --
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68 -- Exclude_Min/Exclude_Max, if non null, provide a range of addresses
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69 -- to ignore from the computation of the traceback.
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70 --
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71 -- Skip_Frames says how many of the most recent calls should at least
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72 -- be excluded from the result, regardless of the exclusion bounds and
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73 -- starting with this procedure itself: 1 means exclude the frame for
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74 -- this procedure, 2 means 1 + exclude the frame for this procedure's
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75 -- caller, ...
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76 --
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77 -- On return, the Traceback array is filled in, and Len indicates the
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78 -- number of stored entries. The first entry is the most recent call,
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79 -- and the last entry is the highest level call.
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80
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81 function C_Call_Chain
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82 (Traceback : System.Address;
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83 Max_Len : Natural) return Natural;
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84 pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");
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85 -- Version that can be used directly from C
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86
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87 end System.Traceback;
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