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Removed duplicate code in predicates.

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This commit is contained in:
Tobias Reinhard 2022-12-13 10:42:38 -05:00
parent 8458220b67
commit 1672d293ab
2 changed files with 7 additions and 42 deletions
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41
Test/VeriFast/tasks/vTaskSwitchContext/proof/verifast_lock_predicates.h
View file

@ -85,46 +85,7 @@ predicate isrLockInv_p();
fixpoint int taskISRLockID_f();
predicate taskISRLockInv_p() =
// Access to global variables
[0.5]pointer(&pxCurrentTCBs[coreID_f], ?gCurrentTCB) &*&
integer_((void*) &uxSchedulerSuspended, sizeof(UBaseType_t), false, _) &*&
integer_(&xSchedulerRunning, sizeof(BaseType_t), true, _)
&*&
// top ready priority must be in range
integer_((void*) &uxTopReadyPriority, sizeof(UBaseType_t), false, ?gTopReadyPriority) &*&
0 <= gTopReadyPriority &*& gTopReadyPriority < configMAX_PRIORITIES
&*&
// tasks / TCBs
exists_in_taskISRLockInv_p(?gTasks, ?gStates)
&*&
// (RP-All) Read permissions for every task
// and recording of task states in state list
// (∀t ∈ gTasks.
// [1/2]sharedSeg_TCB_p(t, _))
// ∧
// ∀i. ∀t. gTasks[i] == t -> gStates[i] == t->xTaskRunState
foreach(gTasks, readOnly_sharedSeg_TCB_p(gTasks, gStates))
&*&
// (RP-Current) Read permission for task currently scheduled on this core
// (RP-All) + (RP-Current) => Write permission for scheduled task
[1/2]sharedSeg_TCB_p(gCurrentTCB, ?gCurrentTCB_state) &*&
// gCurrentTCB_state != taskTASK_NOT_RUNNING &*&
(gCurrentTCB_state == coreID_f() || gCurrentTCB_state == taskTASK_YIELDING) &*&
nth(index_of(gCurrentTCB, gTasks), gStates) == gCurrentTCB_state
&*&
// (RP-Unsched) Read permissions for unscheduled tasks
// (RP-All) + (RP-Unsched) => Write permissions for unscheduled tasks
// ∀t ∈ tasks. t->xTaskState == taskTASK_NOT_RUNNING
// -> [1/2]shared_TCB_p(t, taskTASK_NOT_RUNNING)
foreach(gTasks, readOnly_sharedSeg_TCB_IF_not_running_p(gTasks, gStates))
&*&
readyLists_p(?gCellLists, ?gOwnerLists)
&*&
// gTasks contains all relevant tasks
mem(gCurrentTCB, gTasks) == true
&*&
// ∀l ∈ gOwnerLists. l ⊆ gTasks
forall(gOwnerLists, (superset)(gTasks)) == true;
_taskISRLockInv_p(_);
// Auxiliary predicate. Equal to the lock invariant above but exposes

8
Test/VeriFast/tasks/vTaskSwitchContext/src/tasks.c
View file

@ -932,7 +932,8 @@ static void prvYieldForTask( TCB_t * pxTCB,
@*/
{
//@ open taskISRLockInv_p();
//@ assert( integer_((void*) &uxTopReadyPriority, sizeof(UBaseType_t), false, ?gTopReadyPriority0) );
//@ open _taskISRLockInv_p(?gTopReadyPriority0);
//@ assert( integer_((void*) &uxTopReadyPriority, sizeof(UBaseType_t), false, gTopReadyPriority0) );
//@ assert( gTopReadyPriority0 == uxTopReadyPriority);
UBaseType_t uxCurrentPriority = uxTopReadyPriority;
BaseType_t xTaskScheduled = pdFALSE;
@ -1390,6 +1391,7 @@ static void prvYieldForTask( TCB_t * pxTCB,
// @ append_take_nth_drop(uxCurrentPriority, gOwnerLists);
// @ close readyLists_p(gCellLists2, gOwnerLists2);
//@ close _taskISRLockInv_p(_);
//@ close taskISRLockInv_p();
return pdFALSE;
}
@ -1508,7 +1510,6 @@ static void prvYieldForTask( TCB_t * pxTCB,
#endif /* if ( configUSE_CORE_AFFINITY == 1 ) */
#endif /* if ( configNUM_CORES > 1 ) */
//@ open _taskISRLockInv_p(_);
//@ close taskISRLockInv_p();
return pdTRUE;
}
@ -4442,11 +4443,13 @@ void vTaskSwitchContext( BaseType_t xCoreID )
#endif /* VERIFAST */
//@ open taskISRLockInv_p();
//@ open _taskISRLockInv_p(_);
if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
{
/* The scheduler is currently suspended - do not allow a context
* switch. */
xYieldPendings[ xCoreID ] = pdTRUE;
//@ close _taskISRLockInv_p(_);
//@ close taskISRLockInv_p();
}
else
@ -4494,6 +4497,7 @@ void vTaskSwitchContext( BaseType_t xCoreID )
/* Select a new task to run using either the generic C or port
* optimised asm code. */
//@ close _taskISRLockInv_p(_);
//@ close taskISRLockInv_p();
( void ) prvSelectHighestPriorityTask( xCoreID );
traceTASK_SWITCHED_IN();