Hi,
I am writing a ClangTool that visits every function in a module, and edits
source code based on the CFG. For a function I want to instrument,
however, the CFG produces blocks that list a successor as NULL. This is a
problem because I need to perform a breadth-first search of the CFG, and I
cannot because of the null successor. I have listed the result of
cfg->dump() below. What could be the cause of this? Any help would be
appreciated. Thanks.
[B18 (ENTRY)]
Succs (1): B17
[B1]
1: i += 30
Preds (1): B2
Succs (1): B5
[B2]
1: strlen(json)
2: MarsSendBlocking(1, json, [B2.1])
Preds (2): B3 B4
Succs (1): B1
[B3]
Preds (1): B4
Succs (1): B2
[B4]
T: if <null expr>
Preds (1): B5
Succs (2): B3 B2
[B5]
T: for (; ; ...)
Preds (2): B1 B6
Succs (2): B4 NULL
[B6]
1: strlen(json)
2: MarsSendBlocking(1, json, [B6.1])
Succs (1): B5
[B7]
1: i++
Preds (2): B8 B9
Succs (1): B10
[B8]
Preds (1): B9
Succs (1): B7
[B9]
1: char tempString[6];
T: if <null expr>
Preds (1): B10
Succs (2): B8 B7
[B10]
T: for (...; ; ...)
Preds (2): B7 B11
Succs (2): B9 NULL
[B11]
1: ndc_str[14] = 0
2: npi_str[12] = 0
3: zip_str[5] = 0
4: t.tm_isdst = -1
5: mktime(&t)
6: time_prescribed = [B11.5]
7: printf("year:%u month:%u day:%u hour:%u min:%u sec:%u\n", t.tm_year,
t.tm_mon, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec)
8: i = 0
Preds (1): B12
Succs (1): B10
[B12]
T: if <null expr>
Preds (2): B13 B14
Succs (2): B11 B0
[B13]
Preds (1): B14
Succs (1): B12
[B14]
T: if <null expr>
Succs (2): B13 B12
[B15]
1: i++
Preds (1): B16
Succs (1): B16
[B16]
T: for (...; ; ...)
Preds (2): B15 B17
Succs (2): B15 NULL
[B17]
1: char ndc_str[15];
2: char npi_str[13];
3: char zip_str[6];
4: char dosageIntervals;
5: int last_msg_idx;
6: int i;
7: struct tm t;
8: time_t time_prescribed;
9: i = 0
Preds (1): B18
Succs (1): B16
[B0 (EXIT)]
Preds (1): B12
--
Derrick McKee
Ph.D. Student Computer Science
Purdue University
SensorHound, Inc.
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