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Identify entities and supply a SPARK specification for F_MM

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Claire Dross
2017-06-16 14:43:34 +02:00
parent 8cb01c5cfa
commit 8070372543
3 changed files with 385 additions and 0 deletions
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UseCaseDevelopment/Layer2_MMS_SW_SPARK/mms-f_pt-f_mm-behavior-guarantees.adb Normal file
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package body MMS.F_PT.F_MM.Behavior.Guarantees with SPARK_Mode is
procedure Run is
begin
MMS.F_PT.F_MM.Behavior.Run;
end Run;
end MMS.F_PT.F_MM.Behavior.Guarantees;

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UseCaseDevelopment/Layer2_MMS_SW_SPARK/mms-f_pt-f_mm-behavior-guarantees.ads Normal file
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-- This package provides a wrapper above MMS.F_PT.F_MM.Behavior.Run which
-- is used to verify in SPARK that high level guarantees on F_MM are implied
-- by its behavioural specification.
package MMS.F_PT.F_MM.Behavior.Guarantees with SPARK_Mode is
pragma Unevaluated_Use_Of_Old (Allow);
-----------------------------------
-- High-Level Properties on F_MM --
-----------------------------------
function In_Take_Off_State return Boolean is
(Power_State = On
and then On_State = RUNNING
and then Running_State = TAKE_OFF);
function Energy_Check_Succeed return Boolean is
(Power_State = ON
and then On_State = INIT
and then Energy_Compatible_With_Mission);
function Energy_Check_Fail return Boolean is
(Power_State = ON
and then On_State = RUNNING
and then Running_State = CRUISE
and then not Energy_Compatible_With_Mission);
function Mission_Cancelled return Boolean is
(Power_State = On
and then On_State = CANCELLED);
-----------------------------------
-- High-Level Garantees for F_MM --
-----------------------------------
procedure Run with
Post =>
-- 6.6.3.A Viability guarantee: no take-off if energy aboard is
-- incompatible with mission completion.
(if In_Take_Off_State and then not In_Take_Off_State'Old then
Energy_Check_Succeed'Old)
-- 6.6.3.B Any mission cancellation is signaled to CP and GS.
and then
(if Mission_Cancelled and then not Mission_Cancelled'Old then
Mission_Cancellation_Signaled)
-- 6.6.3.2.A Missions cancelled for energy reasons can be proven
-- infeasible.
and then
(if Mission_Cancelled and then not Mission_Cancelled'Old then
Energy_Check_Fail'Old);
end MMS.F_PT.F_MM.Behavior.Guarantees;

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-- This package provides the behavioural specification of F_MM. It is
-- expressed as a contract on a Run procedure which reprents the modifications
-- performed on the state State of F_MM at each cycle of the functionality.
-- We write the contract using a Contract_Cases and we use SPARK to ensure
-- that:
-- - Information about the current State of the module are only accessed
-- when it makes sense (represented as preconditions over accessors).
-- - A single behaviour is specified for each case in the specification.
-- - There is a behaviour is specified for every case in the specification.
package MMS.F_PT.F_MM.Behavior with
SPARK_Mode,
Abstract_State => State
is
pragma Unevaluated_Use_Of_Old (Allow);
-----------------------------------------
-- States of the automaton in Figure 3 --
-----------------------------------------
type Power_State_Type is (ON, OFF);
function Power_State return Power_State_Type with
Global => State;
type On_State_Type is (INIT, RUNNING, CANCELLED, COMPLETE, ABORTED);
function On_State return On_State_Type with
Global => State,
Pre => Power_State = ON;
type Running_State_Type is (TAKE_OFF, CLIMB, CRUISE, DESCENT, LANDING);
function Running_State return Running_State_Type with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING;
function Navigation_Mode return Navigation_Mode_Type with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING;
function Operating_Mode return Navigation_Option_Type with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then Navigation_Mode = RP;
-----------------------------------------
-- Guards of the automaton in Figure 3 --
-----------------------------------------
function Boarding_Completed return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = INIT,
Post =>
(if Boarding_Completed'Result then
Payload_Bay_Closed
and then Mission_Parameters_Defined
and then Energy_Compatible_With_Mission);
function Power_On return Boolean with
Global => State;
function Power_Off return Boolean with
Global => State,
Post => Power_Off'Result = not Power_On;
function Mission_Abort_Received return Boolean with
Global => State,
Pre => Power_State = ON;
function Start_Or_Go_Received return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = INIT;
function Take_Off_Over return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then Running_State = TAKE_OFF;
function Descent_Over return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then Running_State = DESCENT;
function Landed return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then Running_State = LANDING;
function Operating_Mode_Changed return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | CRUISE | DESCENT)
and then Navigation_Mode = RP;
function Cruise_Altitude_Reached return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | DESCENT);
----------------
-- Properties --
----------------
function Energy_Compatible_With_Mission return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State in INIT | RUNNING
and then (if On_State = RUNNING then Running_State = CRUISE);
function Mission_Parameters_Defined return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = INIT;
function Payload_Bay_Closed return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = INIT;
function Emergency_Landing return Boolean with
Global => State,
Pre => Power_State = ON
and then On_State = CANCELLED;
function Mission_Cancellation_Signaled return Boolean with
Global => State;
---------------------------------------
-- Behavioural Specification of F_MM --
---------------------------------------
procedure Run with
Global => (In_Out => State),
Contract_Cases =>
(Power_State = OFF
and then Power_Off
=>
Power_State = OFF,
Power_State = OFF
and then Power_On
=>
Power_State = ON
and then On_State = INIT,
Power_State = ON
and then Power_Off
=>
Power_State = OFF,
Power_State = ON
and then Power_On
and then (On_State in INIT | RUNNING)
and then Mission_Abort_Received
=>
Power_State = ON
and then On_State = ABORTED,
Power_State = ON
and then Power_On
and then On_State = INIT
and then not Mission_Abort_Received
and then not Boarding_Completed
=>
Power_State = ON
and then On_State = INIT,
Power_State = ON
and then Power_On
and then On_State = INIT
and then not Mission_Abort_Received
and then Boarding_Completed
and then not Start_Or_Go_Received
=>
Power_State = ON
and then On_State = INIT,
Power_State = ON
and then Power_On
and then On_State = INIT
and then not Mission_Abort_Received
and then Boarding_Completed
and then Start_Or_Go_Received
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = TAKE_OFF,
Power_State = ON
and then On_State = RUNNING
and then Running_State = TAKE_OFF
and then Power_On
and then not Mission_Abort_Received
and then Take_Off_Over
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = CLIMB,
Power_State = ON
and then On_State = RUNNING
and then Running_State = TAKE_OFF
and then Power_On
and then not Mission_Abort_Received
and then not Take_Off_Over
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = TAKE_OFF,
Power_State = ON
and then On_State = RUNNING
and then Running_State = CRUISE
and then Power_On
and then not Mission_Abort_Received
and then not Energy_Compatible_With_Mission
=>
Power_State = ON
and then On_State = CANCELLED
and then Mission_Cancellation_Signaled
and then Emergency_Landing,
Power_State = ON
and then On_State = RUNNING
and then Running_State = DESCENT
and then Power_On
and then not Mission_Abort_Received
and then Descent_Over
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = LANDING,
Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | CRUISE | DESCENT)
and then Power_On
and then not Mission_Abort_Received
and then Navigation_Mode = RP
and then
(if Running_State = CRUISE then Energy_Compatible_With_Mission)
and then
(if Running_State = DESCENT then not Descent_Over)
and then Operating_Mode_Changed
=>
Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | DESCENT),
Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | DESCENT)
and then Power_On
and then not Mission_Abort_Received
and then (if Navigation_Mode = RP then not Operating_Mode_Changed)
and then (if Running_State = DESCENT then not Descent_Over)
and then Cruise_Altitude_Reached
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = CRUISE,
Power_State = ON
and then On_State = RUNNING
and then (Running_State in CLIMB | DESCENT | CRUISE)
and then Power_On
and then not Mission_Abort_Received
and then
(if Running_State = CRUISE then Energy_Compatible_With_Mission)
and then (if Navigation_Mode = RP then not Operating_Mode_Changed)
and then
(if Running_State in CLIMB | DESCENT then
not Cruise_Altitude_Reached)
and then (if Running_State = DESCENT then not Descent_Over)
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = Running_State'Old,
Power_State = ON
and then On_State = RUNNING
and then Running_State = LANDING
and then Power_On
and then not Mission_Abort_Received
and then Landed
=>
Power_State = ON
and then On_State = COMPLETE,
Power_State = ON
and then On_State = RUNNING
and then Running_State = LANDING
and then Power_On
and then not Mission_Abort_Received
and then not Landed
=>
Power_State = ON
and then On_State = RUNNING
and then Running_State = LANDING,
Power_State = ON
and then Power_On
and then (On_State in CANCELLED .. ABORTED)
=>
Power_State = ON
and then On_State = On_State'Old);
end MMS.F_PT.F_MM.Behavior;