Frama-C Bug Tracking System - Frama-C |
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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0002501 | Frama-C | Plug-in > wp | public | 2020-03-10 11:44 | 2020-06-12 08:59 |
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| Reporter | jens | |
| Assigned To | AllanBlanchard | |
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | fixed | |
| Platform | | OS | Linux, macOS | OS Version | |
| Product Version | Frama-C 20-Calcium | |
| Target Version | | Fixed in Version | Frama-C 21-Scandium | |
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| Summary | 0002501: error in generated proof obligation |
| Description | The attached file 'issue.c' contains a simplified (but still not very small) example of an issue I have within ACSL by Example.
There is lemma R_2 for the logic function R.
The definition of R uses the logic function F contained in the axiomatic block A.
When trying to verify R_2 with the command line below I obtain the message
[Why3 Error] anomaly: Failure("Can't find 'L_F' in why3 namespace")
frama-c -wp -wp-prover alt-ergo -wp-prover native:coq issue.c
[kernel] Parsing issue.c (with preprocessing)
[wp] Warning: native support for coq is deprecated, use tip instead
[wp] 2 goals scheduled
[wp] [Failed] Goal typed_lemma_R_2
Alt-Ergo 2.3.1: Failed
[Why3 Error] anomaly: Failure("Can't find 'L_F' in why3 namespace")
Coq: Unknown
[wp] [Cache] found:1
[wp] Proved goals: 1 / 2
Qed: 0
Coq: 0 (unknown: 1)
Alt-Ergo 2.3.1: 1 (10ms) (23) (cached: 1) (failed: 1)
When looking at the generated verification condition with Coq I found the following:
The generated hypothesis 'FixL_R' uses of course the function 'L_F'.
However, the necessary import clause 'Require Import A_A.' comes only AFTER the definition of 'FixL_R'.
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| Steps To Reproduce | |
| Additional Information | There is a work-around by calling the helper function 'Fix' in the definition of R (see the comment in the code).
The problem also "disappears' if lemma 'R_1' is removed (but I don't have this option).
While looking at this problem, I noticed that in general coq definitions and import clauses are interspersed in the verification conditions... |
| Tags | No tags attached. |
| Relationships | |
| Attached Files |  issue.c (857) 2020-03-10 11:44
https://bts.frama-c.com/file_download.php?file_id=1347&type=bug |
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| Issue History |
| Date Modified | Username | Field | Change |
| 2020-03-10 11:44 | jens | New Issue | |
| 2020-03-10 11:44 | jens | Status | new => assigned |
| 2020-03-10 11:44 | jens | Assigned To | => correnson |
| 2020-03-10 11:44 | jens | File Added: issue.c | |
| 2020-03-16 12:32 | correnson | Assigned To | correnson => AllanBlanchard |
| 2020-05-09 16:46 | jens | Note Added: 0006971 | |
| 2020-05-12 17:12 | AllanBlanchard | Note Added: 0006972 | |
| 2020-05-12 17:12 | AllanBlanchard | Status | assigned => resolved |
| 2020-05-12 17:12 | AllanBlanchard | Fixed in Version | => Frama-C 21-Scandium |
| 2020-05-12 17:12 | AllanBlanchard | Resolution | open => fixed |
| 2020-05-12 17:27 | AllanBlanchard | Note Edited: 0006972 | View Revisions |
| 2020-06-12 08:59 | signoles | Status | resolved => closed |