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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 . T R A C E B A C K _ E N T R I E S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2003-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 -- This package offers an abstraction of what is stored in traceback arrays
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37 -- for call-chain computation purposes. By default, as defined in this
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38 -- version of the package, an entry is a mere code location representing the
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39 -- address of a call instruction part of the call-chain.
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40
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41 pragma Polling (Off);
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42 -- We must turn polling off for this unit, because otherwise we get
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43 -- elaboration circularities with Ada.Exceptions.
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44
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45 pragma Compiler_Unit_Warning;
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46
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47 package System.Traceback_Entries is
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48 pragma Preelaborate;
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49
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50 subtype Traceback_Entry is System.Address;
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51 -- This subtype defines what each traceback array entry contains
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52
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53 Null_TB_Entry : constant Traceback_Entry := System.Null_Address;
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54 -- This is the value to be used when initializing an entry
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55
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56 type Tracebacks_Array is array (Positive range <>) of Traceback_Entry;
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57
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58 function PC_For (TB_Entry : Traceback_Entry) return System.Address;
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59 pragma Inline (PC_For);
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60 -- Returns the address of the call instruction associated with the
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61 -- provided entry.
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62
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63 function TB_Entry_For (PC : System.Address) return Traceback_Entry;
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64 pragma Inline (TB_Entry_For);
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65 -- Returns an entry representing a frame for a call instruction at PC
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66
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67 end System.Traceback_Entries;
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