diff options
| author | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2015-04-01 18:27:15 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2015-04-01 18:27:15 +0200 |
| commit | 68e2ce02f8d69b26c9cea6e0d338f855cbea3ace (patch) | |
| tree | 98acb09c398112bff31ce34c0857aa0f4e9b8e23 /backend/ValueDomain.v | |
| parent | 5d6febecb8c0f90a627033744f6f62164645a1a4 (diff) | |
| parent | daccc2928e6410c4e8c886ea7d019fd9a071b931 (diff) | |
| download | compcert-68e2ce02f8d69b26c9cea6e0d338f855cbea3ace.tar.gz compcert-68e2ce02f8d69b26c9cea6e0d338f855cbea3ace.zip | |
Merge pull request #31 from AbsInt/null-ptr-cmp
Revised semantics of comparisons between a pointer and 0.
Diffstat (limited to 'backend/ValueDomain.v')
| -rw-r--r-- | backend/ValueDomain.v | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/backend/ValueDomain.v b/backend/ValueDomain.v index 92004a2f..ff3ccfa1 100644 --- a/backend/ValueDomain.v +++ b/backend/ValueDomain.v @@ -2121,12 +2121,14 @@ Proof. assert (IP: forall i b ofs, cmatch (Val.cmpu_bool valid c (Vint i) (Vptr b ofs)) (cmp_different_blocks c)). { - intros. simpl. destruct (Int.eq i Int.zero). apply cmp_different_blocks_sound. apply cmp_different_blocks_none. + intros. simpl. destruct (Int.eq i Int.zero && (valid b (Int.unsigned ofs) || valid b (Int.unsigned ofs - 1))). + apply cmp_different_blocks_sound. apply cmp_different_blocks_none. } assert (PI: forall i b ofs, cmatch (Val.cmpu_bool valid c (Vptr b ofs) (Vint i)) (cmp_different_blocks c)). { - intros. simpl. destruct (Int.eq i Int.zero). apply cmp_different_blocks_sound. apply cmp_different_blocks_none. + intros. simpl. destruct (Int.eq i Int.zero && (valid b (Int.unsigned ofs) || valid b (Int.unsigned ofs - 1))). + apply cmp_different_blocks_sound. apply cmp_different_blocks_none. } unfold cmpu_bool; inversion H; subst; inversion H0; subst; auto using cmatch_top, cmp_different_blocks_none, pcmp_none, |