108 lines
5.6 KiB
Ada
108 lines
5.6 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- 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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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2000-2015, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides an interface allowing to control *automatic* output
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-- to standard error upon exception occurrences (as opposed to explicit
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-- generation of traceback information using System.Traceback).
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-- This output includes the basic information associated with the exception
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-- (name, message) as well as a backtrace of the call chain at the point
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-- where the exception occurred. This backtrace is only output if the call
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-- chain information is available, depending if the binder switch dedicated
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-- to that purpose has been used or not.
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-- The default backtrace is in the form of absolute code locations which may
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-- be converted to corresponding source locations using the addr2line utility
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-- or from within GDB. Please refer to System.Traceback for information about
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-- what is necessary to be able to exploit this possibility.
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-- The backtrace output can also be customized by way of a "decorator" which
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-- may return any string output in association with a provided call chain.
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-- The decorator replaces the default backtrace mentioned above.
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-- On systems that use DWARF debugging output, then if the "-g" compiler
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-- switch and the "-Es" binder switch are used, the decorator is automatically
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-- set to Symbolic_Traceback.
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with System.Traceback_Entries;
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package System.Exception_Traces is
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-- The following defines the exact situations in which raises will
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-- cause automatic output of trace information.
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type Trace_Kind is
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(Every_Raise,
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-- Denotes the initial raise event for any exception occurrence, either
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-- explicit or due to a specific language rule, within the context of a
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-- task or not.
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Unhandled_Raise,
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-- Denotes the raise events corresponding to exceptions for which there
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-- is no user defined handler. This includes unhandled exceptions in
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-- task bodies.
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Unhandled_Raise_In_Main
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-- Same as Unhandled_Raise, except exceptions in task bodies are not
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-- included.
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);
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-- The following procedures can be used to activate and deactivate
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-- traces identified by the above trace kind values.
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procedure Trace_On (Kind : Trace_Kind);
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-- Activate the traces denoted by Kind
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procedure Trace_Off;
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-- Stop the tracing requested by the last call to Trace_On.
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-- Has no effect if no such call has ever occurred.
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-- The following provide the backtrace decorating facilities
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type Traceback_Decorator is access
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function (Traceback : Traceback_Entries.Tracebacks_Array) return String;
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-- A backtrace decorator is a function which returns the string to be
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-- output for a call chain provided by way of a tracebacks array.
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procedure Set_Trace_Decorator (Decorator : Traceback_Decorator);
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-- Set the decorator to be used for future automatic outputs. Restore the
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-- default behavior if the provided access value is null.
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--
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-- Note: System.Traceback.Symbolic.Symbolic_Traceback may be used as the
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-- Decorator, to get a symbolic traceback. This will cause a significant
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-- cpu and memory overhead on some platforms.
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--
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-- Note: The Decorator is called when constructing the
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-- Exception_Information; that needs to be taken into account
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-- if the Decorator has any side effects.
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end System.Exception_Traces;
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