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(*
Replace available expressions by the register containing their value.
Proofs.
David Monniaux, CNRS, VERIMAG
*)
Require Import Coqlib Maps Errors Integers Floats Lattice Kildall.
Require Import AST Linking.
Require Import Memory Registers Op RTL Maps.
Require Import Globalenvs Values.
Require Import Linking Values Memory Globalenvs Events Smallstep.
Require Import Registers Op RTL.
Require Import CSE3 CSE3analysis CSE3analysisproof.
Section SOUNDNESS.
Variable F V : Type.
Variable genv: Genv.t F V.
Variable sp : val.
End SOUNDNESS.
Definition match_prog (p tp: RTL.program) :=
match_program (fun cu f tf => tf = transf_fundef f) eq p tp.
Lemma transf_program_match:
forall p, match_prog p (transf_program p).
Proof.
intros. apply match_transform_program; auto.
Qed.
Section PRESERVATION.
Variables prog tprog: program.
Hypothesis TRANSL: match_prog prog tprog.
Let ge := Genv.globalenv prog.
Let tge := Genv.globalenv tprog.
Lemma functions_translated:
forall v f,
Genv.find_funct ge v = Some f ->
Genv.find_funct tge v = Some (transf_fundef f).
Proof (Genv.find_funct_transf TRANSL).
Lemma function_ptr_translated:
forall v f,
Genv.find_funct_ptr ge v = Some f ->
Genv.find_funct_ptr tge v = Some (transf_fundef f).
Proof (Genv.find_funct_ptr_transf TRANSL).
Lemma symbols_preserved:
forall id,
Genv.find_symbol tge id = Genv.find_symbol ge id.
Proof (Genv.find_symbol_transf TRANSL).
Lemma senv_preserved:
Senv.equiv ge tge.
Proof (Genv.senv_transf TRANSL).
Lemma sig_preserved:
forall f, funsig (transf_fundef f) = funsig f.
Proof.
destruct f; trivial.
Qed.
Lemma find_function_translated:
forall ros rs fd,
find_function ge ros rs = Some fd ->
find_function tge ros rs = Some (transf_fundef fd).
Proof.
unfold find_function; intros. destruct ros as [r|id].
eapply functions_translated; eauto.
rewrite symbols_preserved. destruct (Genv.find_symbol ge id); try congruence.
eapply function_ptr_translated; eauto.
Qed.
Inductive match_frames: RTL.stackframe -> RTL.stackframe -> Prop :=
| match_frames_intro: forall res f sp pc rs,
(* (forall m : mem,
forall vres, (fmap_sem' sp m (forward_map f) pc rs # res <- vres)) -> *)
match_frames (Stackframe res f sp pc rs)
(Stackframe res (transf_function f) sp pc rs).
Inductive match_states: RTL.state -> RTL.state -> Prop :=
| match_regular_states: forall stk f sp pc rs m stk'
(STACKS: list_forall2 match_frames stk stk'),
(* (fmap_sem' sp m (forward_map f) pc rs) -> *)
match_states (State stk f sp pc rs m)
(State stk' (transf_function f) sp pc rs m)
| match_callstates: forall stk f args m stk'
(STACKS: list_forall2 match_frames stk stk'),
match_states (Callstate stk f args m)
(Callstate stk' (transf_fundef f) args m)
| match_returnstates: forall stk v m stk'
(STACKS: list_forall2 match_frames stk stk'),
match_states (Returnstate stk v m)
(Returnstate stk' v m).
Lemma step_simulation:
forall S1 t S2, RTL.step ge S1 t S2 ->
forall S1', match_states S1 S1' ->
exists S2', RTL.step tge S1' t S2' /\ match_states S2 S2'.
Proof.
Admitted.
Lemma transf_initial_states:
forall S1, RTL.initial_state prog S1 ->
exists S2, RTL.initial_state tprog S2 /\ match_states S1 S2.
Proof.
intros. inv H. econstructor; split.
econstructor.
eapply (Genv.init_mem_transf TRANSL); eauto.
rewrite symbols_preserved. rewrite (match_program_main TRANSL). eauto.
eapply function_ptr_translated; eauto.
rewrite <- H3; apply sig_preserved.
constructor. constructor.
Qed.
Lemma transf_final_states:
forall S1 S2 r, match_states S1 S2 -> RTL.final_state S1 r -> RTL.final_state S2 r.
Proof.
intros. inv H0. inv H. inv STACKS. constructor.
Qed.
Theorem transf_program_correct:
forward_simulation (RTL.semantics prog) (RTL.semantics tprog).
Proof.
eapply forward_simulation_step.
apply senv_preserved.
eexact transf_initial_states.
eexact transf_final_states.
exact step_simulation.
Qed.
End PRESERVATION.
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