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Diffstat (limited to 'src/hls/RTLParFU.v')
-rw-r--r-- | src/hls/RTLParFU.v | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/src/hls/RTLParFU.v b/src/hls/RTLParFU.v new file mode 100644 index 0000000..f0ceafd --- /dev/null +++ b/src/hls/RTLParFU.v @@ -0,0 +1,389 @@ +(* + * Vericert: Verified high-level synthesis. + * Copyright (C) 2020-2021 Yann Herklotz <yann@yannherklotz.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + *) + +Require Import compcert.backend.Registers. +Require Import compcert.common.AST. +Require Import compcert.common.Events. +Require Import compcert.common.Globalenvs. +Require Import compcert.common.Memory. +Require Import compcert.common.Smallstep. +Require Import compcert.common.Values. +Require Import compcert.lib.Coqlib. +Require Import compcert.lib.Integers. +Require Import compcert.lib.Maps. +Require Import compcert.verilog.Op. + +Require Import vericert.hls.FunctionalUnits. +Require Import Predicate. +Require Import Vericertlib. + +Definition node := positive. + +Inductive instr : Type := +| FUnop : instr +| FUop : option pred_op -> operation -> list reg -> reg -> instr +| FUread : positive -> positive -> reg -> instr +| FUwrite : positive -> positive -> reg -> instr +| FUsetpred : option pred_op -> condition -> list reg -> predicate -> instr. + +Inductive cf_instr : Type := +| FUcall : signature -> reg + ident -> list reg -> reg -> node -> cf_instr +| FUtailcall : signature -> reg + ident -> list reg -> cf_instr +| FUbuiltin : external_function -> list (builtin_arg reg) -> + builtin_res reg -> node -> cf_instr +| FUcond : condition -> list reg -> node -> node -> cf_instr +| FUjumptable : reg -> list node -> cf_instr +| FUreturn : option reg -> cf_instr +| FUgoto : node -> cf_instr +| FUpred_cf : pred_op -> cf_instr -> cf_instr -> cf_instr. + +Fixpoint successors_instr (i : cf_instr) : list node := + match i with + | FUcall sig ros args res s => s :: nil + | FUtailcall sig ros args => nil + | FUbuiltin ef args res s => s :: nil + | FUcond cond args ifso ifnot => ifso :: ifnot :: nil + | FUjumptable arg tbl => tbl + | FUreturn optarg => nil + | FUgoto n => n :: nil + | FUpred_cf p c1 c2 => concat (successors_instr c1 :: successors_instr c2 :: nil) + end. + +Definition max_reg_instr (m: positive) (i: instr) := + match i with + | FUnop => m + | FUop p op args res => + fold_left Pos.max args (Pos.max res m) + | FUread p1 p2 r => Pos.max m r + | FUwrite p1 p2 r => Pos.max m r + | FUsetpred p' c args p => + fold_left Pos.max args m + end. + +Fixpoint max_reg_cfi (m : positive) (i : cf_instr) := + match i with + | FUcall sig (inl r) args res s => + fold_left Pos.max args (Pos.max r (Pos.max res m)) + | FUcall sig (inr id) args res s => + fold_left Pos.max args (Pos.max res m) + | FUtailcall sig (inl r) args => + fold_left Pos.max args (Pos.max r m) + | FUtailcall sig (inr id) args => + fold_left Pos.max args m + | FUbuiltin ef args res s => + fold_left Pos.max (params_of_builtin_args args) + (fold_left Pos.max (params_of_builtin_res res) m) + | FUcond cond args ifso ifnot => fold_left Pos.max args m + | FUjumptable arg tbl => Pos.max arg m + | FUreturn None => m + | FUreturn (Some arg) => Pos.max arg m + | FUgoto n => m + | FUpred_cf p c1 c2 => Pos.max (max_reg_cfi m c1) (max_reg_cfi m c2) + end. + +Definition regset := Regmap.t val. +Definition predset := PMap.t bool. + +Definition eval_predf (pr: predset) (p: pred_op) := + sat_predicate p (fun x => pr !! (Pos.of_nat x)). + +#[global] + Instance eval_predf_Proper : Proper (eq ==> equiv ==> eq) eval_predf. +Proof. + unfold Proper. simplify. unfold "==>". + intros. + unfold sat_equiv in *. intros. unfold eval_predf. subst. apply H0. +Qed. + +#[local] Open Scope pred_op. + +Lemma eval_predf_Pand : + forall ps p p', + eval_predf ps (p ∧ p') = eval_predf ps p && eval_predf ps p'. +Proof. unfold eval_predf; split; simplify; auto with bool. Qed. + +Lemma eval_predf_Por : + forall ps p p', + eval_predf ps (p ∨ p') = eval_predf ps p || eval_predf ps p'. +Proof. unfold eval_predf; split; simplify; auto with bool. Qed. + +Lemma eval_predf_pr_equiv : + forall p ps ps', + (forall x, ps !! x = ps' !! x) -> + eval_predf ps p = eval_predf ps' p. +Proof. + induction p; simplify; auto; + try (unfold eval_predf; simplify; repeat (destruct_match; []); inv Heqp0; rewrite <- H; auto); + [repeat rewrite eval_predf_Pand|repeat rewrite eval_predf_Por]; + erewrite IHp1; try eassumption; erewrite IHp2; eauto. +Qed. + +Fixpoint init_regs (vl: list val) (rl: list reg) {struct rl} : regset := + match rl, vl with + | r1 :: rs, v1 :: vs => Regmap.set r1 v1 (init_regs vs rs) + | _, _ => Regmap.init Vundef + end. + +Definition bblock_body := list (list (list instr)). + +Record bblock : Type := + mk_bblock { + bb_body: bblock_body; + bb_exit: cf_instr + }. + +Definition code: Type := PTree.t bblock. + +Record function: Type := + mkfunction { + fn_sig: signature; + fn_params: list reg; + fn_stacksize: Z; + fn_code: code; + fn_funct_units: resources; + fn_entrypoint: node; + }. + +Definition fundef := AST.fundef function. +Definition program := AST.program fundef unit. + +Definition funsig (fd: fundef) := + match fd with + | Internal f => fn_sig f + | External ef => ef_sig ef + end. + +Inductive stackframe : Type := +| Stackframe: + forall (res: reg) (**r where to store the result *) + (f: function) (**r calling function *) + (sp: val) (**r stack pointer in calling function *) + (pc: node) (**r program point in calling function *) + (rs: regset) (**r register state in calling function *) + (pr: predset), (**r predicate state of the calling function *) + stackframe. + +Inductive state : Type := +| State: + forall (stack: list stackframe) (**r call stack *) + (f: function) (**r current function *) + (sp: val) (**r stack pointer *) + (pc: node) (**r current program point in [c] *) + (rs: regset) (**r register state *) + (pr: predset) (**r predicate register state *) + (m: mem), (**r memory state *) + state +| Callstate: + forall (stack: list stackframe) (**r call stack *) + (f: fundef) (**r function to call *) + (args: list val) (**r arguments to the call *) + (m: mem), (**r memory state *) + state +| Returnstate: + forall (stack: list stackframe) (**r call stack *) + (v: val) (**r return value for the call *) + (m: mem), (**r memory state *) + state. + +Record instr_state := mk_instr_state { + is_rs: regset; + is_ps: predset; + is_mem: mem; + }. + +Definition genv := Genv.t fundef unit. + +Section RELSEM. + + Context (ge: genv). + + Definition find_function + (ros: reg + ident) (rs: regset) : option fundef := + match ros with + | inl r => Genv.find_funct ge rs#r + | inr symb => + match Genv.find_symbol ge symb with + | None => None + | Some b => Genv.find_funct_ptr ge b + end + end. + + Inductive eval_pred: option pred_op -> instr_state -> instr_state -> instr_state -> Prop := + | eval_pred_true: + forall i i' p, + eval_predf (is_ps i) p = true -> + eval_pred (Some p) i i' i' + | eval_pred_false: + forall i i' p, + eval_predf (is_ps i) p = false -> + eval_pred (Some p) i i' i + | eval_pred_none: + forall i i', eval_pred None i i' i. + + Inductive step_instr: val -> instr_state -> instr -> instr_state -> Prop := + | exec_FUnop: + forall sp ist, + step_instr sp ist FUnop ist + | exec_FUop: + forall op v res args rs m sp p ist pr, + eval_operation ge sp op rs##args m = Some v -> + eval_pred p (mk_instr_state rs pr m) (mk_instr_state (rs#res <- v) pr m) ist -> + step_instr sp (mk_instr_state rs pr m) (FUop p op args res) ist + | exec_FUsetpred: + forall sp rs pr m p c b args p' ist, + Op.eval_condition c rs##args m = Some b -> + eval_pred p' (mk_instr_state rs pr m) (mk_instr_state rs (pr#p <- b) m) ist -> + step_instr sp (mk_instr_state rs pr m) (FUsetpred p' c args p) ist. + + Inductive step_instr_list: val -> instr_state -> list instr -> instr_state -> Prop := + | exec_RBcons: + forall state i state' state'' instrs sp, + step_instr sp state i state' -> + step_instr_list sp state' instrs state'' -> + step_instr_list sp state (i :: instrs) state'' + | exec_RBnil: + forall state sp, + step_instr_list sp state nil state. + + Inductive step_instr_seq (sp : val) + : instr_state -> list (list instr) -> instr_state -> Prop := + | exec_instr_seq_cons: + forall state i state' state'' instrs, + step_instr_list sp state i state' -> + step_instr_seq sp state' instrs state'' -> + step_instr_seq sp state (i :: instrs) state'' + | exec_instr_seq_nil: + forall state, + step_instr_seq sp state nil state. + + Inductive step_instr_block (sp : val) + : instr_state -> bblock_body -> instr_state -> Prop := + | exec_instr_block_cons: + forall state i state' state'' instrs, + step_instr_seq sp state i state' -> + step_instr_block sp state' instrs state'' -> + step_instr_block sp state (i :: instrs) state'' + | exec_instr_block_nil: + forall state, + step_instr_block sp state nil state. + + Inductive step_cf_instr: state -> cf_instr -> trace -> state -> Prop := + | exec_FUcall: + forall s f sp rs m res fd ros sig args pc pc' pr, + find_function ros rs = Some fd -> + funsig fd = sig -> + step_cf_instr (State s f sp pc rs pr m) (FUcall sig ros args res pc') + E0 (Callstate (Stackframe res f sp pc' rs pr :: s) fd rs##args m) + | exec_FUtailcall: + forall s f stk rs m sig ros args fd m' pc pr, + find_function ros rs = Some fd -> + funsig fd = sig -> + Mem.free m stk 0 f.(fn_stacksize) = Some m' -> + step_cf_instr (State s f (Vptr stk Ptrofs.zero) pc rs pr m) (FUtailcall sig ros args) + E0 (Callstate s fd rs##args m') + | exec_FUbuiltin: + forall s f sp rs m ef args res pc' vargs t vres m' pc pr, + eval_builtin_args ge (fun r => rs#r) sp m args vargs -> + external_call ef ge vargs m t vres m' -> + step_cf_instr (State s f sp pc rs pr m) (FUbuiltin ef args res pc') + t (State s f sp pc' (regmap_setres res vres rs) pr m') + | exec_FUcond: + forall s f sp rs m cond args ifso ifnot b pc pc' pr, + eval_condition cond rs##args m = Some b -> + pc' = (if b then ifso else ifnot) -> + step_cf_instr (State s f sp pc rs pr m) (FUcond cond args ifso ifnot) + E0 (State s f sp pc' rs pr m) + | exec_FUjumptable: + forall s f sp rs m arg tbl n pc pc' pr, + rs#arg = Vint n -> + list_nth_z tbl (Int.unsigned n) = Some pc' -> + step_cf_instr (State s f sp pc rs pr m) (FUjumptable arg tbl) + E0 (State s f sp pc' rs pr m) + | exec_FUreturn: + forall s f stk rs m or pc m' pr, + Mem.free m stk 0 f.(fn_stacksize) = Some m' -> + step_cf_instr (State s f (Vptr stk Ptrofs.zero) pc rs pr m) (FUreturn or) + E0 (Returnstate s (regmap_optget or Vundef rs) m') + | exec_FUgoto: + forall s f sp pc rs pr m pc', + step_cf_instr (State s f sp pc rs pr m) (FUgoto pc') E0 (State s f sp pc' rs pr m) + | exec_FUpred_cf: + forall s f sp pc rs pr m cf1 cf2 st' p t, + step_cf_instr (State s f sp pc rs pr m) (if eval_predf pr p then cf1 else cf2) t st' -> + step_cf_instr (State s f sp pc rs pr m) (FUpred_cf p cf1 cf2) t st'. + + Inductive step: state -> trace -> state -> Prop := + | exec_bblock: + forall s f sp pc rs rs' m m' t s' bb pr pr', + f.(fn_code)!pc = Some bb -> + step_instr_block sp (mk_instr_state rs pr m) bb.(bb_body) (mk_instr_state rs' pr' m') -> + step_cf_instr (State s f sp pc rs' pr' m') bb.(bb_exit) t s' -> + step (State s f sp pc rs pr m) t s' + | exec_function_internal: + forall s f args m m' stk, + Mem.alloc m 0 f.(fn_stacksize) = (m', stk) -> + step (Callstate s (Internal f) args m) + E0 (State s + f + (Vptr stk Ptrofs.zero) + f.(fn_entrypoint) + (init_regs args f.(fn_params)) + (PMap.init false) m') + | exec_function_external: + forall s ef args res t m m', + external_call ef ge args m t res m' -> + step (Callstate s (External ef) args m) + t (Returnstate s res m') + | exec_return: + forall res f sp pc rs s vres m pr, + step (Returnstate (Stackframe res f sp pc rs pr :: s) vres m) + E0 (State s f sp pc (rs#res <- vres) pr m). + +End RELSEM. + +Inductive initial_state (p: program): state -> Prop := +| initial_state_intro: forall b f m0, + let ge := Genv.globalenv p in + Genv.init_mem p = Some m0 -> + Genv.find_symbol ge p.(prog_main) = Some b -> + Genv.find_funct_ptr ge b = Some f -> + funsig f = signature_main -> + initial_state p (Callstate nil f nil m0). + +Inductive final_state: state -> int -> Prop := +| final_state_intro: forall r m, + final_state (Returnstate nil (Vint r) m) r. + +Definition semantics (p: program) := + Semantics step (initial_state p) final_state (Genv.globalenv p). + +Definition max_reg_bblock (m : positive) (pc : node) (bb : bblock) := + let max_body := fold_left (fun x l => fold_left (fun x' l' => fold_left max_reg_instr l' x') l x) bb.(bb_body) m in + max_reg_cfi max_body bb.(bb_exit). + +Definition max_reg_function (f: function) := + Pos.max + (PTree.fold max_reg_bblock f.(fn_code) 1%positive) + (Pos.max (fold_left Pos.max f.(fn_params) 1%positive) + (max_reg_resources f.(fn_funct_units))). + +Definition max_pc_function (f: function) : positive := + PTree.fold (fun m pc i => (Pos.max m + (pc + match Zlength i.(bb_body) + with Z.pos p => p | _ => 1 end))%positive) + f.(fn_code) 1%positive. |