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More conservative value analysis of pointer equality #516

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merged 2 commits into from
Jul 26, 2024
Merged

More conservative value analysis of pointer equality #516

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0db5822
More conservative analysis of pointer equality and difference
xavierleroy Jul 23, 2024
918df5a
Update test suite
xavierleroy Jul 23, 2024
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16 changes: 1 addition & 15 deletions backend/ValueDomain.v
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Original file line number Diff line number Diff line change
Expand Up @@ -391,15 +391,7 @@ Qed.
Definition pcmp (c: comparison) (p1 p2: aptr) : abool :=
match p1, p2 with
| Pbot, _ | _, Pbot => Bnone
| Gl id1 ofs1, Gl id2 ofs2 =>
if peq id1 id2 then Maybe (Ptrofs.cmpu c ofs1 ofs2)
else cmp_different_blocks c
| Gl id1 ofs1, Glo id2 =>
if peq id1 id2 then Btop else cmp_different_blocks c
| Glo id1, Gl id2 ofs2 =>
if peq id1 id2 then Btop else cmp_different_blocks c
| Glo id1, Glo id2 =>
if peq id1 id2 then Btop else cmp_different_blocks c
| Gl id1 ofs1, Gl id2 ofs2 => if peq id1 id2 then Maybe (Ptrofs.cmpu c ofs1 ofs2) else Btop
| Stk ofs1, Stk ofs2 => Maybe (Ptrofs.cmpu c ofs1 ofs2)
| (Gl _ _ | Glo _ | Glob | Nonstack), (Stk _ | Stack) => cmp_different_blocks c
| (Stk _ | Stack), (Gl _ _ | Glo _ | Glob | Nonstack) => cmp_different_blocks c
Expand Down Expand Up @@ -438,9 +430,6 @@ Proof.
unfold pcmp; inv H; inv H0; (apply cmatch_top || (apply DIFF; congruence) || idtac).
- destruct (peq id id0). subst id0. apply SAME. eapply bc_glob; eauto.
auto with va.
- destruct (peq id id0); auto with va.
- destruct (peq id id0); auto with va.
- destruct (peq id id0); auto with va.
- apply SAME. eapply bc_stack; eauto.
Qed.

Expand Down Expand Up @@ -476,9 +465,6 @@ Proof.
unfold pcmp; inv H; inv H0; (apply cmatch_top || (apply DIFF; congruence) || idtac).
- destruct (peq id id0). subst id0. apply SAME. eapply bc_glob; eauto.
auto with va.
- destruct (peq id id0); auto with va.
- destruct (peq id id0); auto with va.
- destruct (peq id id0); auto with va.
- apply SAME. eapply bc_stack; eauto.
Qed.

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2 changes: 1 addition & 1 deletion test
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Submodule test updated 4 files
+5 −0 export/.gitignore
+3 −1 export/Makefile
+2 −0 regression/Results/alias
+31 −1 regression/alias.c