7 #include "snapshot-interface.h"
12 /* MYBINARYNAME only works because our pathname usually includes 'model' (e.g.,
13 * /.../model-checker/test/userprog.o) */
14 #define MYBINARYNAME "model"
15 #define MYLIBRARYNAME "libmodel.so"
16 #define MAPFILE "/proc/self/maps"
19 stackEntry(snapshot_id id, int idx) : snapshotid(id), index(idx) { }
20 snapshot_id snapshotid;
29 int backTrackBeforeStep(int seq_index);
30 void snapshotStep(int seq_index);
34 std::vector<struct stackEntry, ModelAlloc<struct stackEntry> > stack;
37 static SnapshotStack *snapshotObject;
40 /** The SnapshotGlobalSegments function computes the memory regions
41 * that may contain globals and then configures the snapshotting
42 * library to snapshot them.
44 static void SnapshotGlobalSegments()
47 char buf[9000], execname[100];
50 sprintf(execname, "vmmap -interleaved %d", pid);
51 map = popen(execname, "r");
58 /* Wait for correct part */
59 while (fgets(buf, sizeof(buf), map)) {
60 if (strstr(buf, "==== regions for process"))
64 while (fgets(buf, sizeof(buf), map)) {
65 char regionname[200] = "";
73 //Skip out at the end of the section
77 sscanf(buf, "%22s %p-%p [%5dK] %c%c%c/%c%c%c SM=%3s %200s\n", type, &begin, &end, &size, &r, &w, &x, &mr, &mw, &mx, smstr, regionname);
79 if (w == 'w' && (strstr(regionname, MYBINARYNAME) || strstr(regionname, MYLIBRARYNAME))) {
80 size_t len = ((uintptr_t)end - (uintptr_t)begin) / PAGESIZE;
82 snapshot_add_memory_region(begin, len);
89 static void get_binary_name(char *buf, size_t len)
91 if (readlink("/proc/self/exe", buf, len) == -1) {
97 /** The SnapshotGlobalSegments function computes the memory regions
98 * that may contain globals and then configures the snapshotting
99 * library to snapshot them.
101 static void SnapshotGlobalSegments()
104 char binary_name[800];
107 map = fopen(MAPFILE, "r");
112 get_binary_name(binary_name, sizeof(binary_name));
113 while (fgets(buf, sizeof(buf), map)) {
114 char regionname[200] = "";
118 sscanf(buf, "%p-%p %c%c%c%c %*x %*x:%*x %*u %200s\n", &begin, &end, &r, &w, &x, &p, regionname);
119 if (w == 'w' && (strstr(regionname, binary_name) || strstr(regionname, MYLIBRARYNAME))) {
120 size_t len = ((uintptr_t)end - (uintptr_t)begin) / PAGESIZE;
122 snapshot_add_memory_region(begin, len);
123 DEBUG("%55s: %18p - %18p\t%c%c%c%c\n", regionname, begin, end, r, w, x, p);
130 SnapshotStack::SnapshotStack() : stack()
132 SnapshotGlobalSegments();
135 SnapshotStack::~SnapshotStack()
139 /** This method returns to the last snapshot before the inputted
140 * sequence number. This function must be called from the model
141 * checking thread and not from a snapshotted stack.
142 * @param seqindex is the sequence number to rollback before.
143 * @return is the sequence number we actually rolled back to.
145 int SnapshotStack::backTrackBeforeStep(int seqindex)
148 for (i = (int)stack.size() - 1; i >= 0; i++)
149 if (stack[i].index <= seqindex)
155 snapshot_roll_back(stack[i].snapshotid);
156 return stack[i].index;
159 /** This method takes a snapshot at the given sequence number. */
160 void SnapshotStack::snapshotStep(int seqindex)
162 stack.push_back(stackEntry(seqindex, take_snapshot()));
165 void snapshot_stack_init()
167 snapshotObject = new SnapshotStack();
170 void snapshot_record(int seq_index)
172 snapshotObject->snapshotStep(seq_index);
175 int snapshot_backtrack_before(int seq_index)
177 return snapshotObject->backTrackBeforeStep(seq_index);