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Issue created Jun 11, 2012 by mantis-gitlab-migration@mantis-gitlab-migration

imprecision in PDG when unreachable statements

ID0001194: This issue was created automatically from Mantis Issue 1194. Further discussion may take place here.


Id Project Category View Due Date Updated
ID0001194 Frama-C Plug-in > scope public 2012-06-11 2012-09-19
Reporter Anne Assigned To yakobowski Resolution fixed
Priority normal Severity minor Reproducibility have not tried
Platform - OS - OS Version -
Product Version Frama-C Nitrogen-20111001 Target Version - Fixed in Version Frama-C Oxygen-20120901

Description :

The PDG computation propagates a state that roughly maps zones to PDG nodes. It uses a Lmap_bitwise.Location_map_bitwise. After an unreachable statement, the state is said to be "empty" instead of "bottom", which leads to some imprecision when merging with another state because instead of having: { x --> XXX } U bottom = { x --> XXX } we get : { x --> XXX } U { } = { x --> XXX or SELF }

Please, ask if you need more information to fix it.

Additional Information :

Can see the problem with the enclosed script : and pdg_pb.c :

int main (void) { int x = 0; char * name = get_name (); if (x > 0) { x ++; } f (name); return x; }

$ frama-c pdg_pb.c -load-script pdg_pb.ml

Attachments

  • pdg_pb.ml
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