#include <unistd.h>
#include <cstring>
#include <inttypes.h>
+#include <vector>
#include "snapshot-interface.h"
#include "snapshot.h"
#include "common.h"
+#include "mymemory.h"
/* MYBINARYNAME only works because our pathname usually includes 'model' (e.g.,
* /.../model-checker/test/userprog.o) */
#define MYLIBRARYNAME "libmodel.so"
#define MAPFILE "/proc/self/maps"
-SnapshotStack *snapshotObject;
+struct snapshot_entry {
+ snapshot_entry(snapshot_id id, int idx) : snapshotid(id), index(idx) { }
+ snapshot_id snapshotid;
+ int index;
+ MEMALLOC
+};
+
+class SnapshotStack {
+ public:
+ int backTrackBeforeStep(int seq_index);
+ void snapshotStep(int seq_index);
+
+ MEMALLOC
+ private:
+ std::vector<struct snapshot_entry, ModelAlloc<struct snapshot_entry> > stack;
+};
+
+static SnapshotStack *snap_stack;
#ifdef MAC
/** The SnapshotGlobalSegments function computes the memory regions
}
#endif
-SnapshotStack::SnapshotStack()
-{
- SnapshotGlobalSegments();
- stack = NULL;
-}
-
-SnapshotStack::~SnapshotStack()
-{
-}
-
/** This method returns to the last snapshot before the inputted
* sequence number. This function must be called from the model
* checking thread and not from a snapshotted stack.
*/
int SnapshotStack::backTrackBeforeStep(int seqindex)
{
- while (true) {
- if (stack->index <= seqindex) {
- //have right entry
- snapshot_roll_back(stack->snapshotid);
- return stack->index;
- }
- struct stackEntry *tmp = stack;
- stack = stack->next;
- model_free(tmp);
- }
+ int i;
+ for (i = (int)stack.size() - 1; i >= 0; i++)
+ if (stack[i].index <= seqindex)
+ break;
+ else
+ stack.pop_back();
+
+ ASSERT(i >= 0);
+ snapshot_roll_back(stack[i].snapshotid);
+ return stack[i].index;
}
/** This method takes a snapshot at the given sequence number. */
void SnapshotStack::snapshotStep(int seqindex)
{
- struct stackEntry *tmp = (struct stackEntry *)model_malloc(sizeof(struct stackEntry));
- tmp->next = stack;
- tmp->index = seqindex;
- tmp->snapshotid = take_snapshot();
- stack = tmp;
+ stack.push_back(snapshot_entry(take_snapshot(), seqindex));
+}
+
+void snapshot_stack_init()
+{
+ snap_stack = new SnapshotStack();
+ SnapshotGlobalSegments();
+}
+
+void snapshot_record(int seq_index)
+{
+ snap_stack->snapshotStep(seq_index);
+}
+
+int snapshot_backtrack_before(int seq_index)
+{
+ return snap_stack->backTrackBeforeStep(seq_index);
}