frama-c gets confused by comma operator inside ternary operator: cannot cast from void to char
ID0002117: This issue was created automatically from Mantis Issue 2117. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0002117 | Frama-C | Kernel | public | 2015-05-09 | 2016-01-26 |
| Reporter | edwin | Assigned To | yakobowski | Resolution | fixed |
| Priority | normal | Severity | minor | Reproducibility | always |
| Platform | Linux debian 3.16.0-4-amd64 #1 S | OS | Debian GNU/Linux | OS Version | Jessie |
| Product Version | Frama-C Sodium | Target Version | - | Fixed in Version | Frama-C Magnesium |
Description :
GCC and Clang correctly parse and compile the testcase below, however frama-c considers it invalid (cannot cast from void to char).
In (char)(1?(((x)=6),1):0) AFAICT the type of (((x)=6),1) is integer, the void on the lhs of the comma operator should be ignored.
Additional Information :
$ frama-c --version Version: Sodium-20150201 Compilation date: Thu May 7 22:46:49 EEST 2015 Share path: /home/edwin/.opam/system/share/frama-c (may be overridden with FRAMAC_SHARE variable) Library path: /home/edwin/.opam/system/lib/frama-c (may be overridden with FRAMAC_LIB variable) Plug-in paths: /home/edwin/.opam/system/lib/frama-c/plugins (may be overridden with FRAMAC_PLUGIN variable)
$ ocaml -vnum 4.01.0
I originally encountered this problem when trying to parse sqlite3 with frama-c, see the getVarint32 macro. http://www.sqlite.org/cgi/src/artifact/20d9c59fd8277450
Steps To Reproduce :
$ cat >x.c <<EOF void foo(void) { char x; (char)(1?(((x)=6),1):0); (void)((char)(1?(((x)=6),1):0)); } EOF
$ frama-c x.c [kernel] Parsing FRAMAC_SHARE/libc/__fc_builtin_for_normalization.i (no preprocessing) [kernel] Parsing x.c (with preprocessing) x.c:3:[kernel] user error: cannot cast from void to char [kernel] user error: stopping on file "x.c" that has errors. Add '-kernel-msg-key pp' for preprocessing command. [kernel] Frama-C aborted: invalid user input.