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MEVEL Glen
iris-time-proofs
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5759fc5b
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5759fc5b
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Nov 16, 2018
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MEVEL Glen
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Update README
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@@ -36,7 +36,7 @@ support it.
opam repo add iris-dev https://gitlab.mpi-sws.org/FP/opam-dev.git
opam update
opam pin add coq-iris -k version dev.2018-1
0-13.0.7041c043
opam pin add coq-iris -k version dev.2018-1
1-01.3.19aae59a
(This will also install
`coq-stdpp`
, another Coq library made available through
the same repo.)
...
...
@@ -49,8 +49,7 @@ The TLC library is required by the proof of the union-find algorithm. It is
available through an opam package in the Coq repository (added earlier).
opam install coq-tlc
TODO: version?
opam pin add coq-tlc -k version 20180316
## Compiling
...
...
@@ -79,28 +78,31 @@ Important modules are highlighted.
*
`Misc`
: some basic things
*
`Auth_nat`
,
`Auth_mnat`
: simple lemmas about the authoritative resources on
(ℕ, +) and (ℕ, max)
*
`heap_lang/`
directory: the toy language under study
*
`Reduction`
: generic lemmas about reduction, safety, closedness, fresh
locations…
[should be renamed or split into several files]
locations…
*
`Tactics`
: helper tactics to reduce concrete terms
*
__
`Translation`
: definition of the translation and syntactic lemmas about
it__
*
__
`Simulation`
: generic definition of
`tick`
; operational lemmas about the
translation with that
`tick`
__
*
__
`TimeCredits`
: interface, implementation, and proof of soundness for time
credits (plus
a
proof-mode tactic
`wp_tick`
)__
*
__
`TimeCreditsAltProofs`
: alternative proofs
o
f the soundness theorem of
time credits
, that does not rely on the unsafe behavior of
`tick`
__
credits (plus proof-mode tactic
s
`wp_tick
_*
`
)__
*
__
`TimeCreditsAltProofs`
: alternative proofs f
or
the soundness theorem of
time credits__
*
__
`TimeReceipts`
: interface, implementation, and proof of soundness for time
receipts
(
both exclusive and persistent)__
receipts
,
both exclusive and persistent
(plus proof-mode tactics
)__
*
__
`Combined`
: logical system providing both time credits and time receipts
at the same time__
*
`Examples`
: a very simple example illustrating the use of time credits to
specify a program with lists
*
__
`Thunks`
: implementation of timed thunks using time credits__
*
__
`ClockedIntegers`
: reconstruction of Clochard’s integer types (
`onetime`
and
`peano`
) using time receipts__
*
__
`ClockIntegers`
: reconstruction of Clochard’s integer types (
`onetime`
and
`peano`
) using time receipts__
*
__
`union_find/`
directory: application of the combined system to a
union-find program__
### From
the
paper to the Coq code
### From
ESOP
paper to the Coq code
#### Generic translation and “tick”
...
...
@@ -109,13 +111,10 @@ example, `translation_subst`).
In
`Simulation.v`
:
*
The operational semantics of “tick” in the nonzero case is given by lemma
`exec_tick_success`
.
*
The “Forward Simulation” lemma is
`simulation_exec_success`
.
*
The “Forward Simulation of Unsafe Behaviors” lemma corresponds roughly to
`safe_translation__safe_here`
.
*
The “Safety Transfer” lemma is
`adequate_translation__adequate`
(in the Coq
development, by contrast with the paper, not only do we prove safety of
*
Lemma 1 (“Reduction Preservation”) is
`simulation_exec_success`
.
*
Lemma 2 (“Immediate Safety Preservation”) is
`safe_translation__safe_here`
.
*
Lemma 3 (“Safety Preservation”) is
`adequate_translation__nadequate`
(in the
Coq development, by contrast with the paper, not only do we prove safety of
programs, but also their _adequacy_ with respect to some formula φ; this is
not a difficult property to transfer anyway).
...
...
@@ -123,23 +122,31 @@ In `Simulation.v`:
In
`TimeCredits.v`
:
*
The “Credit Exhaustion” lemma is
`simulation_exec_failure_now`
.
*
The “Soundness of the Time Credit Translation” lemma is
`simulation_exec_failure`
.
*
The “Time Credit Initialization” lemma does not have an exact counterpart in
*
Lemma 4 (“Credit Exhaustion”) is
`simulation_step_failure`
.
*
Lemma 5 (“Safety Preservation, Strengthened”) is presented in
`TimeCreditsAltProofs.v`
, as
`adequate_tctranslation__nadequate`
; the main
development in
`TimeCredits.v`
uses a slightly weaker version, named
`adequate_tctranslation__adequate_and_bounded`
.
*
Lemma 6 (“Time Credit Initialization”) does not have an exact counterpart in
the Coq development, but corresponds roughly to a portion of the proof of
`spec_tctranslation__adequate`
. The fact that our implementation
matches the
interface is stated by
`TC_implementation`
.
*
The
“Soundness of Iris^$ ”
lemma
is
`spec_tctranslation__adequate
_translation
`
. The fact that our implementation
matches the
interface is stated by
`TC_implementation`
.
*
The
orem 1 (
“Soundness of Iris^$ ”
)
is
`abstract_spec_tctranslation__adequate_and_bounded`
.
#### Time receipts
In
`TimeReceipts.v`
:
*
The “Time Receipt Initialization” lemma does not have an exact counterpart
in the Coq development, but corresponds roughly to a portion of the proof of
`spec_trtranslation__adequate_translation`
. The fact that our implementation
matches the interface is stated by
`TR_implementation`
.
*
The “Credit Exhaustion” lemma is
`simulation_exec_failure_now`
.
*
The “Soundness of Iris^⧗ ” lemma is
`abstract_spec_trtranslation__adequate`
.
*
Lemma 7 (“Time Receipt Initialization”) lemma does not have an exact
counterpart in the Coq development, but corresponds roughly to a portion of
the proof of
`spec_trtranslation__adequate_translation`
. The fact that our
implementation matches the interface is stated by
`TR_implementation`
.
*
Theorem 2 (“Soundness of Iris^⧗ ”) is
`abstract_spec_trtranslation__adequate`
.
### Marrying time credits and time receipts
In
`Combined.v`
:
*
Theorem 3 (“Soundness of Iris^$⧗ ”) is
`tctr_sound_abstract`
.
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