/* extern declaration definition */
#if USE_MPROTECT_SNAPSHOT
struct SnapShot * snapshotrecord = NULL;
-struct Snapshot_t * sTheRecord = NULL;
#else
-struct Snapshot_t * sTheRecord = NULL;
+struct Snapshot * sTheRecord = NULL;
#endif
#if !USE_MPROTECT_SNAPSHOT
static snapshot_id snapshotid = 0;
#endif
+/** PageAlignedAdressUpdate return a page aligned address for the
+ * address being added as a side effect the numBytes are also changed.
+ */
+static void * PageAlignAddressUpward(void * addr) {
+ return (void *)((((uintptr_t)addr)+PAGESIZE-1)&~(PAGESIZE-1));
+}
+
#if USE_MPROTECT_SNAPSHOT
+/** ReturnPageAlignedAddress returns a page aligned address for the
+ * address being added as a side effect the numBytes are also changed.
+ */
+static void * ReturnPageAlignedAddress(void * addr) {
+ return (void *)(((uintptr_t)addr)&~(PAGESIZE-1));
+}
+
/** The initSnapShotRecord method initialized the snapshotting data
* structures for the mprotect based snapshot.
*/
-void initSnapShotRecord(unsigned int numbackingpages, unsigned int numsnapshots, unsigned int nummemoryregions) {
+static void initSnapShotRecord(unsigned int numbackingpages, unsigned int numsnapshots, unsigned int nummemoryregions) {
snapshotrecord=( struct SnapShot * )MYMALLOC(sizeof(struct SnapShot));
snapshotrecord->regionsToSnapShot=( struct MemoryRegion * )MYMALLOC(sizeof(struct MemoryRegion)*nummemoryregions);
snapshotrecord->backingStoreBasePtr= ( struct SnapShotPage * )MYMALLOC( sizeof( struct SnapShotPage ) * (numbackingpages + 1) );
snapshotrecord->maxBackingPages=numbackingpages;
snapshotrecord->maxSnapShots=numsnapshots;
}
-#endif //nothing to initialize for the fork based snapshotting.
/** HandlePF is the page fault handler for mprotect based snapshotting
* algorithm.
*/
-
-void HandlePF( int sig, siginfo_t *si, void * unused){
-#if USE_MPROTECT_SNAPSHOT
+static void HandlePF( int sig, siginfo_t *si, void * unused){
if( si->si_code == SEGV_MAPERR ){
printf("Real Fault at %p\n", si->si_addr);
exit( EXIT_FAILURE );
perror("mprotect");
// Handle error by quitting?
}
-#endif //nothing to handle for non snapshotting case.
-}
-
-/** ReturnPageAlignedAddress returns a page aligned address for the
- * address being added as a side effect the numBytes are also changed.
- */
-
-void * ReturnPageAlignedAddress(void * addr) {
- return (void *)(((uintptr_t)addr)&~(PAGESIZE-1));
}
+#endif //nothing to handle for non snapshotting case.
-/** PageAlignedAdressUpdate return a page aligned address for the
- * address being added as a side effect the numBytes are also changed.
- */
-
-void * PageAlignAddressUpward(void * addr) {
- return (void *)((((uintptr_t)addr)+PAGESIZE-1)&~(PAGESIZE-1));
-}
-#ifdef __cplusplus
-extern "C" {
-#endif
- void createSharedLibrary(){
+void createSharedLibrary(){
#if !USE_MPROTECT_SNAPSHOT
- //step 1. create shared memory.
- if( sTheRecord ) return;
- int fd = shm_open( "/ModelChecker-Snapshotter", O_RDWR | O_CREAT, 0777 ); //universal permissions.
- if( -1 == fd ) FAILURE("shm_open");
- if( -1 == ftruncate( fd, ( size_t )SHARED_MEMORY_DEFAULT + ( size_t )STACK_SIZE_DEFAULT ) ) FAILURE( "ftruncate" );
- char * memMapBase = ( char * ) mmap( 0, ( size_t )SHARED_MEMORY_DEFAULT + ( size_t )STACK_SIZE_DEFAULT, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
- if( MAP_FAILED == memMapBase ) FAILURE("mmap");
- sTheRecord = ( struct Snapshot_t * )memMapBase;
- sTheRecord->mSharedMemoryBase = memMapBase + sizeof( struct Snapshot_t );
- sTheRecord->mStackBase = ( char * )memMapBase + ( size_t )SHARED_MEMORY_DEFAULT;
- sTheRecord->mStackSize = STACK_SIZE_DEFAULT;
- sTheRecord->mIDToRollback = -1;
- sTheRecord->currSnapShotID = 0;
- sTheRecord->mbFinalize = false;
+ //step 1. create shared memory.
+ if ( sTheRecord )
+ return;
+ int fd = shm_open( "/ModelChecker-Snapshotter", O_RDWR | O_CREAT, 0777 ); //universal permissions.
+ if ( -1 == fd )
+ FAILURE("shm_open");
+ if ( -1 == ftruncate( fd, SHARED_MEMORY_DEFAULT + STACK_SIZE_DEFAULT ) )
+ FAILURE( "ftruncate" );
+ void * memMapBase = mmap( 0, SHARED_MEMORY_DEFAULT + STACK_SIZE_DEFAULT, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
+ if( MAP_FAILED == memMapBase )
+ FAILURE("mmap");
+ sTheRecord = ( struct Snapshot * )memMapBase;
+ sTheRecord->mSharedMemoryBase = (void *)((uintptr_t)memMapBase + sizeof(struct Snapshot));
+ sTheRecord->mStackBase = (void *)((uintptr_t)memMapBase + SHARED_MEMORY_DEFAULT);
+ sTheRecord->mStackSize = STACK_SIZE_DEFAULT;
+ sTheRecord->mIDToRollback = -1;
+ sTheRecord->currSnapShotID = 0;
+ sTheRecord->mbFinalize = false;
#endif
- }
-#ifdef __cplusplus
}
-#endif
/** The initSnapShotLibrary function initializes the Snapshot library.
* @param entryPoint the function that should run the program.
createSharedLibrary();
//step 2 setup the stack context.
-
- int alreadySwapped = 0;
- getcontext( &savedSnapshotContext );
- if( !alreadySwapped ){
- alreadySwapped = 1;
- ucontext_t currentContext, swappedContext, newContext;
- getcontext( &newContext );
- newContext.uc_stack.ss_sp = sTheRecord->mStackBase;
- newContext.uc_stack.ss_size = STACK_SIZE_DEFAULT;
- newContext.uc_link = ¤tContext;
- makecontext( &newContext, entryPoint, 0 );
- swapcontext( &swappedContext, &newContext );
- }
+ ucontext_t newContext;
+ getcontext( &newContext );
+ newContext.uc_stack.ss_sp = sTheRecord->mStackBase;
+ newContext.uc_stack.ss_size = STACK_SIZE_DEFAULT;
+ makecontext( &newContext, entryPoint, 0 );
+ /* switch to a new entryPoint context, on a new stack */
+ swapcontext(&savedSnapshotContext, &newContext);
//add the code to take a snapshot here...
//to return to user process, do a second swapcontext...
/** The takeSnapshot function takes a snapshot.
* @return The snapshot identifier.
*/
-
snapshot_id takeSnapshot( ){
#if USE_MPROTECT_SNAPSHOT
for(unsigned int region=0; region<snapshotrecord->lastRegion;region++) {
/** The rollBack function rollback to the given snapshot identifier.
* @param theID is the snapshot identifier to rollback to.
*/
-
void rollBack( snapshot_id theID ){
#if USE_MPROTECT_SNAPSHOT
std::map< void *, bool, std::less< void * >, MyAlloc< std::pair< const void *, bool > > > duplicateMap;
/** The finalize method shuts down the snapshotting system. */
//Subramanian -- remove this function from the external interface and
//have us call it internally
-
void finalize(){
#if !USE_MPROTECT_SNAPSHOT
sTheRecord->mbFinalize = true;
#endif
}
-
projects / c11tester.git / blobdiff