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IDProjectCategoryView StatusDate SubmittedLast Update
0002501Frama-CPlug-in > wppublic2020-03-10 11:442020-06-12 08:59
Reporterjens 
Assigned ToAllanBlanchard 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionfixed 
PlatformOSLinux, macOSOS Version
Product VersionFrama-C 20-Calcium 
Target VersionFixed in VersionFrama-C 21-Scandium 
Summary0002501: error in generated proof obligation
DescriptionThe 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'.
Additional InformationThere 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...
TagsNo tags attached.
Attached Filesc file icon issue.c [^] (857 bytes) 2020-03-10 11:44 [Show Content]

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-  Notes
(0006971)
jens (reporter)
2020-05-09 16:45

With 20.0+dev (Calcium), installed early May 2020 from https://git.frama-c.com/pub/frama-c, the error is still present.
(0006972)
AllanBlanchard (developer)
2020-05-12 17:12
edited on: 2020-05-12 17:27

The problem has been fixed. The fix will be available in the next release (and in the upcoming bĂȘta) but not immediately in the public development version.

- 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


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