mymemory: add basic model_snapshot_space

[model-checker.git] / snapshot.cc

diff --git a/snapshot.cc b/snapshot.cc
index 734d161c4610bcf5829ba2dc20425d0640944cdb..e006189c44ba1741208183ea8cbddd222b381dfd 100644 (file)
--- a/snapshot.cc
+++ b/snapshot.cc
@@ -30,6 +30,13 @@
 /* extern declaration definition */
 struct SnapShot * snapshotrecord = NULL;
 
+/** 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
 /** @statics
 *   These variables are necessary because the stack is shared region and
@@ -45,16 +52,8 @@ struct SnapShot * snapshotrecord = NULL;
 static ucontext_t savedSnapshotContext;
 static ucontext_t savedUserSnapshotContext;
 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
+#else /* USE_MPROTECT_SNAPSHOT */
 
 /** ReturnPageAlignedAddress returns a page aligned address for the
  * address being added as a side effect the numBytes are also changed.
@@ -109,7 +108,7 @@ static void HandlePF( int sig, siginfo_t *si, void * unused){
                // Handle error by quitting?
        }
 }
-#endif //nothing to handle for non snapshotting case.
+#endif /* USE_MPROTECT_SNAPSHOT */
 
 #if !USE_MPROTECT_SNAPSHOT
 void createSharedMemory(){
@@ -173,20 +172,27 @@ void initSnapshotLibrary(unsigned int numbackingpages,
 
        void *basemySpace = model_malloc((numheappages+1)*PAGESIZE);
        void * pagealignedbase=PageAlignAddressUpward(basemySpace);
-       mySpace = create_mspace_with_base(pagealignedbase,  numheappages*PAGESIZE, 1 );
+       user_snapshot_space = create_mspace_with_base(pagealignedbase, numheappages * PAGESIZE, 1);
        addMemoryRegionToSnapShot(pagealignedbase, numheappages);
+
+       void *base_model_snapshot_space = model_malloc((numheappages + 1) * PAGESIZE);
+       pagealignedbase = PageAlignAddressUpward(base_model_snapshot_space);
+       model_snapshot_space = create_mspace_with_base(pagealignedbase, numheappages * PAGESIZE, 1);
+       addMemoryRegionToSnapShot(pagealignedbase, numheappages);
+
        entryPoint();
 }
 #else
 void initSnapshotLibrary(unsigned int numbackingpages,
                unsigned int numsnapshots, unsigned int nummemoryregions,
                unsigned int numheappages, VoidFuncPtr entryPoint) {
-       void *basemySpace = system_malloc((numheappages+1)*PAGESIZE);
-       void * pagealignedbase=PageAlignAddressUpward(basemySpace);
-       mySpace = create_mspace_with_base(pagealignedbase,  numheappages*PAGESIZE, 1 );
        if (!snapshotrecord)
                createSharedMemory();
 
+       void *base_model_snapshot_space = malloc((numheappages + 1) * PAGESIZE);
+       void *pagealignedbase = PageAlignAddressUpward(base_model_snapshot_space);
+       model_snapshot_space = create_mspace_with_base(pagealignedbase, numheappages * PAGESIZE, 1);
+
        //step 2 setup the stack context.
        ucontext_t newContext;
        getcontext( &newContext );