Use of very large real constants cause failures in proof generation in WP
ID0002232: This issue was created automatically from Mantis Issue 2232. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0002232 | Frama-C | Plug-in > wp | public | 2016-06-14 | 2016-06-14 |
| Reporter | jrobbins | Assigned To | correnson | Resolution | open |
| Priority | normal | Severity | crash | Reproducibility | always |
| Platform | Ununtu 64-bit | OS | Linux | OS Version | 16.04 |
| Product Version | - | Target Version | - | Fixed in Version | - |
Description :
Code that uses real constants larger than the size of a double cause a failure to prove, even with true assertions. When WP tries to create the proof for files containing those constants, the kernel crashes with the message of Invalid_argument("Unrecognized constant "inf"") in the middle of generating the files to send to the prover.
Additional Information :
This was tested in the public Aluminum version, on both a Linux and Cygwin build.
Steps To Reproduce :
== File bug.c (attached):
int main() { //@ assert 1.0 < 0x1.0p2047; }
== Run command:
frama-c bug.c -wp -wp-print
== Output:
[kernel] Parsing FRAMAC_SHARE/libc/__fc_builtin_for_normalization.i (no preprocessing) [kernel] Parsing bug.c (with preprocessing) [wp] warning: Missing RTE guards [wp] 1 goal scheduled [wp] [Alt-Ergo] Goal typed_main_assert : Failed Invalid_argument("Unrecognized constant "inf"") [wp] Proved goals: 0 / 1 Alt-Ergo: 0 (failed: 1)
Function main
Goal Assertion (file bug.c, line 2): Prove: .1e0 < [kernel] Current source was: bug.c:1 The full backtrace is: Raised at file "src/kernel_services/plugin_entry_points/log.ml", line 159, characters 51-56 Called from file "src/plugins/wp/register.ml", line 535, characters 8-22 Called from file "src/libraries/stdlib/extlib.ml", line 334, characters 14-17 Re-raised at file "src/libraries/stdlib/extlib.ml", line 334, characters 47-48 Called from file "src/libraries/stdlib/extlib.ml", line 335, characters 2-12 Called from file "src/libraries/stdlib/extlib.ml", line 335, characters 2-12 Called from file "queue.ml", line 134, characters 6-20 Called from file "src/kernel_internals/runtime/boot.ml", line 37, characters 4-20 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 787, characters 2-9 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 817, characters 18-64 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 228, characters 4-8
Unexpected error (Invalid_argument("Unrecognized constant \"inf\"")).
Please report as 'crash' at http://bts.frama-c.com/.
Your Frama-C version is Aluminium-20160501.
Note that a version and a backtrace alone often do not contain enough
information to understand the bug. Guidelines for reporting bugs are at:http://bts.frama-c.com/dokuwiki/doku.php?id=mantis:frama-c:bug_reporting_guidelines
== Note that the constant "0x1.0p2047" can be replaced with any value greater than or equal to 0x2.0p1023; even other forms of real constant other than hexadecimal.