Commit 284ccdd5 authored by Robbert Krebbers's avatar Robbert Krebbers

Let stateful tactics try all decompositions.

This problem has been reported by Léon Gondelman.

Before, when using, for example wp_alloc, in an expression like:

  ref (ref v)

It would apply `tac_wp_alloc` to the outermost ref, after which it
fails to establish that the argument `ref v` is a value. In this
commit, other evaluation positions will be tried whenever it turn
out that the argument of the construct is not a value. The same
applies to store/cas/...

I have implemented this by making use of the new `IntoVal` class.
parent 85498a9a
......@@ -86,7 +86,7 @@ Implicit Types Φ : val → iProp Σ.
Implicit Types Δ : envs (iResUR Σ).
Lemma tac_wp_alloc Δ Δ' E j K e v Φ :
to_val e = Some v
IntoVal e v
IntoLaterNEnvs 1 Δ Δ'
( l, Δ'',
envs_app false (Esnoc Enil j (l v)) Δ' = Some Δ''
......@@ -111,7 +111,7 @@ Proof.
Qed.
Lemma tac_wp_store Δ Δ' Δ'' E i K l v e v' Φ :
to_val e = Some v'
IntoVal e v'
IntoLaterNEnvs 1 Δ Δ'
envs_lookup i Δ' = Some (false, l v)%I
envs_simple_replace i false (Esnoc Enil i (l v')) Δ' = Some Δ''
......@@ -124,7 +124,7 @@ Proof.
Qed.
Lemma tac_wp_cas_fail Δ Δ' E i K l q v e1 v1 e2 v2 Φ :
to_val e1 = Some v1 to_val e2 = Some v2
IntoVal e1 v1 IntoVal e2 v2
IntoLaterNEnvs 1 Δ Δ'
envs_lookup i Δ' = Some (false, l {q} v)%I v v1
(Δ' WP fill K (Lit (LitBool false)) @ E {{ Φ }})
......@@ -136,7 +136,7 @@ Proof.
Qed.
Lemma tac_wp_cas_suc Δ Δ' Δ'' E i K l v e1 v1 e2 v2 Φ :
to_val e1 = Some v1 to_val e2 = Some v2
IntoVal e1 v1 IntoVal e2 v2
IntoLaterNEnvs 1 Δ Δ'
envs_lookup i Δ' = Some (false, l v)%I v = v1
envs_simple_replace i false (Esnoc Enil i (l v2)) Δ' = Some Δ''
......@@ -166,11 +166,10 @@ Tactic Notation "wp_alloc" ident(l) "as" constr(H) :=
lazymatch goal with
| |- _ wp ?E ?e ?Q =>
first
[reshape_expr e ltac:(fun K e' => eapply (tac_wp_alloc _ _ _ H K))
[reshape_expr e ltac:(fun K e' =>
eapply (tac_wp_alloc _ _ _ H K); [apply _|..])
|fail 1 "wp_alloc: cannot find 'Alloc' in" e];
[let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_alloc:" e' "not a value"
|apply _
[apply _
|first [intros l | fail 1 "wp_alloc:" l "not fresh"];
eexists; split;
[env_cbv; reflexivity || fail "wp_alloc:" H "not fresh"
......@@ -200,11 +199,10 @@ Tactic Notation "wp_store" :=
lazymatch goal with
| |- _ wp ?E ?e ?Q =>
first
[reshape_expr e ltac:(fun K e' => eapply (tac_wp_store _ _ _ _ _ K))
[reshape_expr e ltac:(fun K e' =>
eapply (tac_wp_store _ _ _ _ _ K); [apply _|..])
|fail 1 "wp_store: cannot find 'Store' in" e];
[let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_store:" e' "not a value"
|apply _
[apply _
|let l := match goal with |- _ = Some (_, (?l {_} _)%I) => l end in
iAssumptionCore || fail "wp_store: cannot find" l "↦ ?"
|env_cbv; reflexivity
......@@ -217,13 +215,10 @@ Tactic Notation "wp_cas_fail" :=
lazymatch goal with
| |- _ wp ?E ?e ?Q =>
first
[reshape_expr e ltac:(fun K e' => eapply (tac_wp_cas_fail _ _ _ _ K))
[reshape_expr e ltac:(fun K e' =>
eapply (tac_wp_cas_fail _ _ _ _ K); [apply _|apply _|..])
|fail 1 "wp_cas_fail: cannot find 'CAS' in" e];
[let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_cas_fail:" e' "not a value"
|let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_cas_fail:" e' "not a value"
|apply _
[apply _
|let l := match goal with |- _ = Some (_, (?l {_} _)%I) => l end in
iAssumptionCore || fail "wp_cas_fail: cannot find" l "↦ ?"
|try congruence
......@@ -236,13 +231,10 @@ Tactic Notation "wp_cas_suc" :=
lazymatch goal with
| |- _ wp ?E ?e ?Q =>
first
[reshape_expr e ltac:(fun K e' => eapply (tac_wp_cas_suc _ _ _ _ _ K))
[reshape_expr e ltac:(fun K e' =>
eapply (tac_wp_cas_suc _ _ _ _ _ K); [apply _|apply _|..])
|fail 1 "wp_cas_suc: cannot find 'CAS' in" e];
[let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_cas_suc:" e' "not a value"
|let e' := match goal with |- to_val ?e' = _ => e' end in
wp_done || fail "wp_cas_suc:" e' "not a value"
|apply _
[apply _
|let l := match goal with |- _ = Some (_, (?l {_} _)%I) => l end in
iAssumptionCore || fail "wp_cas_suc: cannot find" l "↦ ?"
|try congruence
......
......@@ -42,6 +42,16 @@ Section LiftingTests.
by repeat (wp_pure _).
Qed.
Definition heap_e4 : expr :=
let: "x" := (let: "y" := ref (ref #1) in ref "y") in
! ! !"x".
Lemma heap_e4_spec : WP heap_e4 {{ v, v = #1 }}%I.
Proof.
rewrite /heap_e4. wp_alloc l. wp_alloc l'. wp_let.
wp_alloc l''. wp_let. by repeat wp_load.
Qed.
Definition FindPred : val :=
rec: "pred" "x" "y" :=
let: "yp" := "y" + #1 in
......
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