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ada: Adjust comments in targparm.ads

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This patch removes a few dangling references to the late front-end
implementation of exceptions from the comments of targparm.ads, and
also fixes a thinko there.

gcc/ada/

	* targparm.ads: Remove references to front-end-based exceptions. Fix
	thinko.
This commit is contained in:
Ronan Desplanques 2023-05-15 09:34:23 +02:00 committed by Marc Poulhiès
parent 3ec78e1147
commit 1de3b5a7b5
1 changed files with 5 additions and 20 deletions
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25
gcc/ada/targparm.ads
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@ -213,22 +213,7 @@ package Targparm is
-- Control of Exception Handling --
-----------------------------------
-- GNAT implements three methods of implementing exceptions:
-- Front-End Longjmp/Setjmp Exceptions
-- This approach uses longjmp/setjmp to handle exceptions. It
-- uses less storage, and can often propagate exceptions faster,
-- at the expense of (sometimes considerable) overhead in setting
-- up an exception handler.
-- The generation of the setjmp and longjmp calls is handled by
-- the front end of the compiler (this includes gigi in the case
-- of the standard GCC back end). It does not use any back end
-- support (such as the GCC3 exception handling mechanism). When
-- this approach is used, the compiler generates special exception
-- handlers for handling cleanups (AT-END actions) when an exception
-- is raised.
-- GNAT provides two methods of implementing exceptions:
-- Back-End Zero Cost Exceptions
@ -254,10 +239,10 @@ package Targparm is
-- Control of Available Methods and Defaults
-- The following switches specify whether we're using a front-end or a
-- back-end mechanism and whether this is a zero-cost or a sjlj scheme.
-- The following switch specifies whether this is a zero-cost or a sjlj
-- scheme.
-- The per-switch default values correspond to the default value of
-- The default value corresponds to the default value of
-- Opt.Exception_Mechanism.
ZCX_By_Default_On_Target : Boolean := False;
@ -408,7 +393,7 @@ package Targparm is
-- Control of Stack Checking --
-------------------------------
-- GNAT provides three methods of implementing exceptions:
-- GNAT provides three methods of implementing stack checking:
-- GCC Probing Mechanism