0c9849e18b
This patch modifies the static elaboration model to stop the inspection of
a task body when it contains a synchronous suspension call and restriction
No_Entry_Calls_In_Elaboration_Code or switch -gnatd_s is in effect.
------------
-- Source --
------------
-- suspension.ads
package Suspension is
procedure ABE;
task type Barrier_Task_1;
task type Barrier_Task_2;
task type Object_Task_1;
task type Object_Task_2;
end Suspension;
-- suspension.adb
with Ada.Synchronous_Barriers; use Ada.Synchronous_Barriers;
with Ada.Synchronous_Task_Control; use Ada.Synchronous_Task_Control;
package body Suspension is
Bar : Synchronous_Barrier (Barrier_Limit'Last);
Obj : Suspension_Object;
task body Barrier_Task_1 is
OK : Boolean;
begin
Wait_For_Release (Bar, OK);
ABE;
end Barrier_Task_1;
task body Barrier_Task_2 is
procedure Block is
OK : Boolean;
begin
Wait_For_Release (Bar, OK);
end Block;
begin
Block;
ABE;
end Barrier_Task_2;
task body Object_Task_1 is
begin
Suspend_Until_True (Obj);
ABE;
end Object_Task_1;
task body Object_Task_2 is
procedure Block is
begin
Suspend_Until_True (Obj);
end Block;
begin
Block;
ABE;
end Object_Task_2;
function Elaborator return Boolean is
BT_1 : Barrier_Task_1;
BT_2 : Barrier_Task_2;
OT_1 : Object_Task_1;
OT_2 : Object_Task_2;
begin
return True;
end Elaborator;
Elab : constant Boolean := Elaborator;
procedure ABE is begin null; end ABE;
end Suspension;
-- main.adb
with Suspension;
procedure Main is begin null; end Main;
----------------------------
-- Compilation and output --
----------------------------
$ gnatmake -q -gnatd_s main.adb
suspension.adb:23:07: warning: cannot call "ABE" before body seen
suspension.adb:23:07: warning: Program_Error may be raised at run time
suspension.adb:23:07: warning: body of unit "Suspension" elaborated
suspension.adb:23:07: warning: function "Elaborator" called at line 51
suspension.adb:23:07: warning: local tasks of "Elaborator" activated
suspension.adb:23:07: warning: procedure "ABE" called at line 23
suspension.adb:39:07: warning: cannot call "ABE" before body seen
suspension.adb:39:07: warning: Program_Error may be raised at run time
suspension.adb:39:07: warning: body of unit "Suspension" elaborated
suspension.adb:39:07: warning: function "Elaborator" called at line 51
suspension.adb:39:07: warning: local tasks of "Elaborator" activated
suspension.adb:39:07: warning: procedure "ABE" called at line 39
2018-05-23 Hristian Kirtchev <kirtchev@adacore.com>
gcc/ada/
* debug.adb: Switch -gnatd_s is now used to stop elaboration checks on
synchronized suspension.
* rtsfind.ads: Add entries for units Ada.Synchronous_Barriers and
Ada.Synchronous_Task_Control and routines Suspend_Until_True and
Wait_For_Release.
* sem_elab.adb: Document switch -gnatd_s.
(In_Task_Body): New routine.
(Is_Potential_Scenario): Code cleanup. Stop the traversal of a task
body when the current construct denotes a synchronous suspension call,
and restriction No_Entry_Calls_In_Elaboration_Code or switch -gnatd_s
is in effect.
(Is_Synchronous_Suspension_Call): New routine.
* switch-c.adb (Scan_Front_End_Switches): Switch -gnatJ now sets switch
-gnatd_s.
From-SVN: r260585
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