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Tej Chajed
iris
Commits
254989a5
Commit
254989a5
authored
Jan 17, 2016
by
Robbert Krebbers
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Hoare triples.
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254989a5
Require
Export
iris
.
weakestpre
iris
.
viewshifts
.
Definition
ht
{
Σ
}
(
E
:
coPset
)
(
P
:
iProp
Σ
)
(
e
:
iexpr
Σ
)
(
Q
:
ival
Σ
→
iProp
Σ
)
:
iProp
Σ
:
=
(
□
(
P
→
wp
E
e
(
λ
v
,
pvs
E
E
(
Q
v
))))%
I
.
Instance
:
Params
(@
ht
)
2
.
Notation
"{{ P } } e @ E {{ Q } }"
:
=
(
ht
E
P
e
Q
)
(
at
level
74
,
format
"{{ P } } e @ E {{ Q } }"
)
:
C_scope
.
Notation
"{{ P } } e @ E {{ Q } }"
:
=
(
True
⊑
ht
E
P
e
Q
)
(
at
level
74
,
format
"{{ P } } e @ E {{ Q } }"
)
:
type_scope
.
Section
hoare
.
Context
{
Σ
:
iParam
}.
Implicit
Types
P
:
iProp
Σ
.
Implicit
Types
Q
:
ival
Σ
→
iProp
Σ
.
Implicit
Types
v
:
ival
Σ
.
Import
uPred
.
Global
Instance
ht_ne
E
n
:
Proper
(
dist
n
==>
eq
==>
pointwise_relation
_
(
dist
n
)
==>
dist
n
)
(@
ht
Σ
E
).
Proof
.
by
intros
P
P'
HP
e
?
<-
Q
Q'
HQ
;
rewrite
/
ht
HP
;
setoid_rewrite
HQ
.
Qed
.
Global
Instance
ht_proper
E
:
Proper
((
≡
)
==>
eq
==>
pointwise_relation
_
(
≡
)
==>
(
≡
))
(@
ht
Σ
E
).
Proof
.
by
intros
P
P'
HP
e
?
<-
Q
Q'
HQ
;
rewrite
/
ht
HP
;
setoid_rewrite
HQ
.
Qed
.
Lemma
ht_mono
E
P
P'
Q
Q'
e
:
P
⊑
P'
→
(
∀
v
,
Q'
v
⊑
Q
v
)
→
{{
P'
}}
e
@
E
{{
Q'
}}
⊑
{{
P
}}
e
@
E
{{
Q
}}.
Proof
.
by
intros
HP
HQ
;
rewrite
/
ht
-
HP
;
setoid_rewrite
HQ
.
Qed
.
Global
Instance
ht_mono'
E
:
Proper
(
flip
(
⊑
)
==>
eq
==>
pointwise_relation
_
(
⊑
)
==>
(
⊑
))
(@
ht
Σ
E
).
Proof
.
by
intros
P
P'
HP
e
?
<-
Q
Q'
HQ
;
apply
ht_mono
.
Qed
.
Lemma
ht_val
E
v
:
{{
True
}}
of_val
v
@
E
{{
λ
v'
,
■
(
v
=
v'
)
}}.
Proof
.
rewrite
-{
1
}
always_const
;
apply
always_intro
,
impl_intro_l
.
by
rewrite
-
wp_value
-
pvs_intro
;
apply
const_intro
.
Qed
.
Lemma
ht_vs
E
P
P'
Q
Q'
e
:
(
P
>{
E
}>
P'
∧
{{
P'
}}
e
@
E
{{
Q'
}}
∧
∀
v
,
Q'
v
>{
E
}>
Q
v
)
⊑
{{
P
}}
e
@
E
{{
Q
}}.
Proof
.
rewrite
-
always_forall
-!
always_and
;
apply
always_intro
,
impl_intro_l
.
rewrite
!
always_and
(
associative
_
P
)
(
always_elim
(
P
→
_
))
impl_elim_r
.
rewrite
(
associative
_
)
pvs_impl_r
pvs_always_r
wp_always_r
.
rewrite
wp_pvs
;
apply
wp_mono
=>
v
.
by
rewrite
(
forall_elim
_
v
)
pvs_impl_r
!
pvs_trans'
.
Qed
.
Lemma
ht_atomic
E1
E2
P
P'
Q
Q'
e
:
E2
⊆
E1
→
atomic
e
→
(
P
>{
E1
,
E2
}>
P'
∧
{{
P'
}}
e
@
E2
{{
Q'
}}
∧
∀
v
,
Q'
v
>{
E2
,
E1
}>
Q
v
)
⊑
{{
P
}}
e
@
E1
{{
Q
}}.
Proof
.
intros
;
rewrite
-
always_forall
-!
always_and
;
apply
always_intro
,
impl_intro_l
.
rewrite
!
always_and
(
associative
_
P
)
(
always_elim
(
P
→
_
))
impl_elim_r
.
rewrite
(
associative
_
)
pvs_impl_r
pvs_always_r
wp_always_r
.
rewrite
-(
wp_atomic
E1
E2
)
//
;
apply
pvs_mono
,
wp_mono
=>
v
.
rewrite
(
forall_elim
_
v
)
pvs_impl_r
-(
pvs_intro
E1
)
pvs_trans
;
solve_elem_of
.
Qed
.
Lemma
ht_bind
`
(
HK
:
is_ctx
K
)
E
P
Q
Q'
e
:
({{
P
}}
e
@
E
{{
Q
}}
∧
∀
v
,
{{
Q
v
}}
K
(
of_val
v
)
@
E
{{
Q'
}})
⊑
{{
P
}}
K
e
@
E
{{
Q'
}}.
Proof
.
intros
;
rewrite
-
always_forall
-!
always_and
;
apply
always_intro
,
impl_intro_l
.
rewrite
!
always_and
(
associative
_
P
)
(
always_elim
(
P
→
_
))
impl_elim_r
.
rewrite
wp_always_r
-
wp_bind
//
;
apply
wp_mono
=>
v
.
rewrite
(
forall_elim
_
v
)
pvs_impl_r
wp_pvs
;
apply
wp_mono
=>
v'
.
by
rewrite
pvs_trans'
.
Qed
.
Lemma
ht_mask_weaken
E1
E2
P
Q
e
:
E1
⊆
E2
→
{{
P
}}
e
@
E1
{{
Q
}}
⊑
{{
P
}}
e
@
E2
{{
Q
}}.
Proof
.
intros
;
apply
always_mono
,
impl_intro_l
;
rewrite
impl_elim_r
.
by
rewrite
-(
wp_mask_weaken
E1
)
//
;
apply
wp_mono
=>
v
;
apply
pvs_mask_weaken
.
Qed
.
Lemma
ht_frame_l
E
P
Q
R
e
:
{{
P
}}
e
@
E
{{
Q
}}
⊑
{{
R
★
P
}}
e
@
E
{{
λ
v
,
R
★
Q
v
}}.
Proof
.
apply
always_intro
,
impl_intro_l
.
rewrite
always_and_sep_r
-(
associative
_
)
(
sep_and
P
)
always_elim
impl_elim_r
.
by
rewrite
wp_frame_l
;
apply
wp_mono
=>
v
;
rewrite
pvs_frame_l
.
Qed
.
Lemma
ht_frame_r
E
P
Q
R
e
:
{{
P
}}
e
@
E
{{
Q
}}
⊑
{{
P
★
R
}}
e
@
E
{{
λ
v
,
Q
v
★
R
}}.
Proof
.
setoid_rewrite
(
commutative
_
_
R
)
;
apply
ht_frame_l
.
Qed
.
Lemma
ht_frame_later_l
E
P
R
e
Q
:
to_val
e
=
None
→
{{
P
}}
e
@
E
{{
Q
}}
⊑
{{
▷
R
★
P
}}
e
@
E
{{
λ
v
,
R
★
Q
v
}}.
Proof
.
intros
;
apply
always_intro
,
impl_intro_l
.
rewrite
always_and_sep_r
-(
associative
_
)
(
sep_and
P
)
always_elim
impl_elim_r
.
by
rewrite
wp_frame_later_l
//
;
apply
wp_mono
=>
v
;
rewrite
pvs_frame_l
.
Qed
.
Lemma
ht_frame_later_r
E
P
R
e
Q
:
to_val
e
=
None
→
{{
P
}}
e
@
E
{{
Q
}}
⊑
{{
P
★
▷
R
}}
e
@
E
{{
λ
v
,
Q
v
★
R
}}.
Proof
.
rewrite
(
commutative
_
_
(
▷
R
)%
I
)
;
setoid_rewrite
(
commutative
_
_
R
).
apply
ht_frame_later_l
.
Qed
.
End
hoare
.
\ No newline at end of file
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