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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2015-07-19 09:29:45 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@inria.fr> | 2015-07-19 09:29:45 +0200 |
| commit | 2932b531ceff2cd4573714aeaeb9b4e537d36af8 (patch) | |
| tree | ed42351e245c076b8cd360d0e753e8c61090e8e5 /arm/ValueAOp.v | |
| parent | 74d06cfedc4a57fbb0be8772431033120b553ab2 (diff) | |
| download | compcert-kvx-2932b531ceff2cd4573714aeaeb9b4e537d36af8.tar.gz compcert-kvx-2932b531ceff2cd4573714aeaeb9b4e537d36af8.zip | |
Value analysis: keep track of pointer values that leak through arithmetic operations with undefined behaviors.
Consider (x ^ 1) ^ 1 where x is a intptr_t containing a pointer value. "x ^ 1" evaluates to Vundef in the CompCert semantics, hence the value analysis, in strict mode, gives abstract result Ifptr Pbot (= any number but not a pointer). In relaxed mode, we now give abstract result Ifptr (poffset p) where p is the abstraction of the pointer, thus keeping track of the actual leak of the pointer value.
Diffstat (limited to 'arm/ValueAOp.v')
| -rw-r--r-- | arm/ValueAOp.v | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arm/ValueAOp.v b/arm/ValueAOp.v index a14d6b98..b388bf12 100644 --- a/arm/ValueAOp.v +++ b/arm/ValueAOp.v @@ -64,8 +64,8 @@ Definition eval_static_operation (op: operation) (vl: list aval): aval := match op, vl with | Omove, v1::nil => v1 | Ointconst n, nil => I n - | Ofloatconst n, nil => if propagate_float_constants tt then F n else ftop - | Osingleconst n, nil => if propagate_float_constants tt then FS n else ftop + | Ofloatconst n, nil => if propagate_float_constants tt then F n else ntop + | Osingleconst n, nil => if propagate_float_constants tt then FS n else ntop | Oaddrsymbol id ofs, nil => Ptr (Gl id ofs) | Oaddrstack ofs, nil => Ptr (Stk ofs) | Ocast8signed, v1 :: nil => sign_ext 8 v1 |