small hack to optimize our common case for snapshotting and set config option to...

[c11tester.git] / snapshot.cc

diff --git a/snapshot.cc b/snapshot.cc
index a1dcad581985ef7f1f9ae663a446a4fb4e5a333d..dadb75956c1f4254c3ecc84d519cd7431a8910af 100644 (file)
--- a/snapshot.cc
+++ b/snapshot.cc
@@ -283,6 +283,15 @@ snapshot_id takeSnapshot( ){
  *  @param theID is the snapshot identifier to rollback to.
  */
 void rollBack( snapshot_id theID ){
+#if USE_MPOTECT_SNAPSHOT==2
+       if (snapshotrecord->lastSnapShot==(theID+1)) {
+               for(unsigned int page=snapshotrecord->snapShots[theID].firstBackingPage; page<snapshotrecord->lastBackingPage; page++) {
+                       memcpy(snapshotrecord->backingRecords[page].basePtrOfPage, &snapshotrecord->backingStore[page], sizeof(struct SnapShotPage));
+               }
+               return;
+       }
+#endif
+
 #if USE_MPROTECT_SNAPSHOT
        HashTable< void *, bool, uintptr_t, 4, model_malloc, model_calloc, model_free> duplicateMap;
        for(unsigned int region=0; region<snapshotrecord->lastRegion;region++) {