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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||
|---|---|---|---|---|---|---|---|---|---|
| 0000844 | Frama-C | Plug-in > Eva | public | 2011-05-28 23:45 | 2011-10-10 14:14 | ||||
| Reporter | yakobowski | ||||||||
| Assigned To | pascal | ||||||||
| Priority | normal | Severity | major | Reproducibility | always | ||||
| Status | closed | Resolution | fixed | ||||||
| Product Version | Frama-C Carbon-20110201 | ||||||||
| Target Version | Fixed in Version | Frama-C Nitrogen-20111001 | |||||||
| Summary | 0000844: Incorrect results with low slevel | ||||||||
| Description | The following program is correct and always terminates. However, with no slevel, the value analysis incorrectly states that main and memset do not terminate. (Analyzed with -value -slevel 0) void* memset (void* dest, int val, unsigned int len) { unsigned char *ptr = (unsigned char*)dest; while (len-- > 0) { *ptr++ = val; } return dest; } extern int k; void main () { int v; int x = k ? 2 : 3; memset(&v,42,x); } | ||||||||
| Tags | No tags attached. | ||||||||
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pascal (reporter) 2011-05-29 00:30 Last edited: 2011-05-29 00:30 |
I note that you have not disabled relations yet. alu:~ pascal$ svn diff ~/ppc Index: /Users/pascal/ppc/src/value/eval.ml =================================================================== --- /Users/pascal/ppc/src/value/eval.ml (revision 13685) +++ /Users/pascal/ppc/src/value/eval.ml (working copy) @@ -304,7 +304,7 @@ (struct let name = "UseRelations" let dependencies = [] let kind = `Internal - let default () = true + let default () = false end) let () = alu:~ pascal$ ~/ppc/bin/toplevel.byte -val u.c ... [value] Values for function main: X ? {0; 1} len ? {0; 1; 2; 4294967295} alu:~ pascal$ cat u.c int X; main(int c, int d, int e){ unsigned len; len = c ? 0 : (e ? 1 : (d ? 2 : 3)); { unsigned int tmp_0 = len; len--; if (! (tmp_0 > (unsigned int)0)) { X=1; } } return X; } alu:~ pascal$ ~/ppc/bin/toplevel.opt -val u.c # old version [value] Values for function main: len ? {0; 1; 2} |
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pascal (reporter) 2011-05-29 01:49 |
Fixed in 13686 (relations disabled) |
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| Issue History |
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| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-05-28 23:45 | yakobowski | New Issue | |
| 2011-05-28 23:45 | yakobowski | Status | new => assigned |
| 2011-05-28 23:45 | yakobowski | Assigned To | => pascal |
| 2011-05-29 00:30 | pascal | Note Added: 0001932 | |
| 2011-05-29 00:30 | pascal | Note Edited: 0001932 | |
| 2011-05-29 01:49 | pascal | Note Added: 0001933 | |
| 2011-05-29 01:49 | pascal | Status | assigned => resolved |
| 2011-05-29 01:49 | pascal | Resolution | open => fixed |
| 2011-10-10 14:13 | signoles | Fixed in Version | => Frama-C Nitrogen-20111001 |
| 2011-10-10 14:14 | signoles | Status | resolved => closed |
| 2018-01-12 14:26 | signoles | Category | Plug-in > value analysis => Plug-in > Eva |
| Issue History |