From 783288d052bbcf75e250dff5018443d109c6101c Mon Sep 17 00:00:00 2001 From: xleroy Date: Wed, 23 Jul 2014 13:14:02 +0000 Subject: Merge the various $(ARCH)/$(VARIANT)/xxx.v files into $(ARCH)/xxx.v. The only platform where we have two variants is ARM, and it's easier to share the callling convention code between the two than to maintain both variants separately. git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2540 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e --- arm/eabi/Conventions1.v | 509 ------------------------------------------------ 1 file changed, 509 deletions(-) delete mode 100644 arm/eabi/Conventions1.v (limited to 'arm/eabi/Conventions1.v') diff --git a/arm/eabi/Conventions1.v b/arm/eabi/Conventions1.v deleted file mode 100644 index c26d29ee..00000000 --- a/arm/eabi/Conventions1.v +++ /dev/null @@ -1,509 +0,0 @@ -(* *********************************************************************) -(* *) -(* The Compcert verified compiler *) -(* *) -(* Xavier Leroy, INRIA Paris-Rocquencourt *) -(* *) -(* Copyright Institut National de Recherche en Informatique et en *) -(* Automatique. All rights reserved. This file is distributed *) -(* under the terms of the INRIA Non-Commercial License Agreement. *) -(* *) -(* *********************************************************************) - -(** Function calling conventions and other conventions regarding the use of - machine registers and stack slots. *) - -Require Import Coqlib. -Require Import AST. -Require Import Events. -Require Import Locations. - -(** * Classification of machine registers *) - -(** Machine registers (type [mreg] in module [Locations]) are divided in - the following groups: -- Temporaries used for spilling, reloading, and parallel move operations. -- Allocatable registers, that can be assigned to RTL pseudo-registers. - These are further divided into: --- Callee-save registers, whose value is preserved across a function call. --- Caller-save registers that can be modified during a function call. - - We follow the PowerPC application binary interface (ABI) in our choice - of callee- and caller-save registers. -*) - -Definition int_caller_save_regs := - R0 :: R1 :: R2 :: R3 :: R12 :: nil. - -Definition float_caller_save_regs := - F0 :: F1 :: F2 :: F3 :: F4 :: F5 :: F6 :: F7 :: nil. - -Definition int_callee_save_regs := - R4 :: R5 :: R6 :: R7 :: R8 :: R9 :: R10 :: R11 :: nil. - -Definition float_callee_save_regs := - F8 :: F9 :: F10 :: F11 :: F12 :: F13 :: F14 :: F15 :: nil. - -Definition destroyed_at_call := - int_caller_save_regs ++ float_caller_save_regs. - -Definition dummy_int_reg := R0. (**r Used in [Coloring]. *) -Definition dummy_float_reg := F0. (**r Used in [Coloring]. *) - -(** The [index_int_callee_save] and [index_float_callee_save] associate - a unique positive integer to callee-save registers. This integer is - used in [Stacking] to determine where to save these registers in - the activation record if they are used by the current function. *) - -Definition index_int_callee_save (r: mreg) := - match r with - | R4 => 0 | R5 => 1 | R6 => 2 | R7 => 3 - | R8 => 4 | R9 => 5 | R10 => 6 | R11 => 7 - | _ => -1 - end. - -Definition index_float_callee_save (r: mreg) := - match r with - | F8 => 0 | F9 => 1 | F10 => 2 | F11 => 3 - | F12 => 4 | F13 => 5 | F14 => 6 | F15 => 7 - | _ => -1 - end. - -Ltac ElimOrEq := - match goal with - | |- (?x = ?y) \/ _ -> _ => - let H := fresh in - (intro H; elim H; clear H; - [intro H; rewrite <- H; clear H | ElimOrEq]) - | |- False -> _ => - let H := fresh in (intro H; contradiction) - end. - -Ltac OrEq := - match goal with - | |- (?x = ?x) \/ _ => left; reflexivity - | |- (?x = ?y) \/ _ => right; OrEq - | |- False => fail - end. - -Ltac NotOrEq := - match goal with - | |- (?x = ?y) \/ _ -> False => - let H := fresh in ( - intro H; elim H; clear H; [intro; discriminate | NotOrEq]) - | |- False -> False => - contradiction - end. - -Lemma index_int_callee_save_pos: - forall r, In r int_callee_save_regs -> index_int_callee_save r >= 0. -Proof. - intro r. simpl; ElimOrEq; unfold index_int_callee_save; omega. -Qed. - -Lemma index_float_callee_save_pos: - forall r, In r float_callee_save_regs -> index_float_callee_save r >= 0. -Proof. - intro r. simpl; ElimOrEq; unfold index_float_callee_save; omega. -Qed. - -Lemma index_int_callee_save_pos2: - forall r, index_int_callee_save r >= 0 -> In r int_callee_save_regs. -Proof. - destruct r; simpl; intro; omegaContradiction || OrEq. -Qed. - -Lemma index_float_callee_save_pos2: - forall r, index_float_callee_save r >= 0 -> In r float_callee_save_regs. -Proof. - destruct r; simpl; intro; omegaContradiction || OrEq. -Qed. - -Lemma index_int_callee_save_inj: - forall r1 r2, - In r1 int_callee_save_regs -> - In r2 int_callee_save_regs -> - r1 <> r2 -> - index_int_callee_save r1 <> index_int_callee_save r2. -Proof. - intros r1 r2. - simpl; ElimOrEq; ElimOrEq; unfold index_int_callee_save; - intros; congruence. -Qed. - -Lemma index_float_callee_save_inj: - forall r1 r2, - In r1 float_callee_save_regs -> - In r2 float_callee_save_regs -> - r1 <> r2 -> - index_float_callee_save r1 <> index_float_callee_save r2. -Proof. - intros r1 r2. - simpl; ElimOrEq; ElimOrEq; unfold index_float_callee_save; - intros; congruence. -Qed. - -(** The following lemmas show that - (temporaries, destroyed at call, integer callee-save, float callee-save) - is a partition of the set of machine registers. *) - -Lemma int_float_callee_save_disjoint: - list_disjoint int_callee_save_regs float_callee_save_regs. -Proof. - red; intros r1 r2. simpl; ElimOrEq; ElimOrEq; discriminate. -Qed. - -Lemma register_classification: - forall r, - In r destroyed_at_call \/ In r int_callee_save_regs \/ In r float_callee_save_regs. -Proof. - destruct r; - try (left; simpl; OrEq); - try (right; left; simpl; OrEq); - try (right; right; simpl; OrEq). -Qed. - - -Lemma int_callee_save_not_destroyed: - forall r, - In r destroyed_at_call -> In r int_callee_save_regs -> False. -Proof. - intros. revert H0 H. simpl. ElimOrEq; NotOrEq. -Qed. - -Lemma float_callee_save_not_destroyed: - forall r, - In r destroyed_at_call -> In r float_callee_save_regs -> False. -Proof. - intros. revert H0 H. simpl. ElimOrEq; NotOrEq. -Qed. - -Lemma int_callee_save_type: - forall r, In r int_callee_save_regs -> mreg_type r = Tany32. -Proof. - intro. simpl; ElimOrEq; reflexivity. -Qed. - -Lemma float_callee_save_type: - forall r, In r float_callee_save_regs -> mreg_type r = Tany64. -Proof. - intro. simpl; ElimOrEq; reflexivity. -Qed. - -Ltac NoRepet := - match goal with - | |- list_norepet nil => - apply list_norepet_nil - | |- list_norepet (?a :: ?b) => - apply list_norepet_cons; [simpl; intuition discriminate | NoRepet] - end. - -Lemma int_callee_save_norepet: - list_norepet int_callee_save_regs. -Proof. - unfold int_callee_save_regs; NoRepet. -Qed. - -Lemma float_callee_save_norepet: - list_norepet float_callee_save_regs. -Proof. - unfold float_callee_save_regs; NoRepet. -Qed. - -(** * Function calling conventions *) - -(** The functions in this section determine the locations (machine registers - and stack slots) used to communicate arguments and results between the - caller and the callee during function calls. These locations are functions - of the signature of the function and of the call instruction. - Agreement between the caller and the callee on the locations to use - is guaranteed by our dynamic semantics for Cminor and RTL, which demand - that the signature of the call instruction is identical to that of the - called function. - - Calling conventions are largely arbitrary: they must respect the properties - proved in this section (such as no overlapping between the locations - of function arguments), but this leaves much liberty in choosing actual - locations. *) - -(** ** Location of function result *) - -(** The result value of a function is passed back to the caller in - registers [R0] or [F0] or [R0,R1], depending on the type of the - returned value. We treat a function without result as a function - with one integer result. *) - -Definition loc_result (s: signature) : list mreg := - match s.(sig_res) with - | None => R0 :: nil - | Some (Tint | Tany32) => R0 :: nil - | Some (Tfloat | Tsingle | Tany64) => F0 :: nil - | Some Tlong => R1 :: R0 :: nil - end. - -(** The result registers have types compatible with that given in the signature. *) - -Lemma loc_result_type: - forall sig, - subtype_list (proj_sig_res' sig) (map mreg_type (loc_result sig)) = true. -Proof. - intros. unfold proj_sig_res', loc_result. destruct (sig_res sig) as [[]|]; auto. -Qed. - -(** The result locations are caller-save registers *) - -Lemma loc_result_caller_save: - forall (s: signature) (r: mreg), - In r (loc_result s) -> In r destroyed_at_call. -Proof. - intros. - assert (r = R0 \/ r = R1 \/ r = F0). - unfold loc_result in H. destruct (sig_res s); [destruct t|idtac]; simpl in H; intuition. - destruct H0 as [A | [A | A]]; subst r; simpl; OrEq. -Qed. - -(** ** Location of function arguments *) - -(** We use the following calling conventions, adapted from the ARM EABI: -- The first 4 integer arguments are passed in registers [R0] to [R3]. -- The first 2 double float arguments are passed in registers [F0] and [F2]. -- The first 4 single float arguments are passed in registers [F0] to [F3]. -- The first 2 long integer arguments are passed in an aligned pair of - two integer registers. -- Each double argument passed in a float register ``consumes'' an aligned pair - of two integer registers. -- Each single argument passed in a float register ``consumes'' an integer - register. -- Extra arguments are passed on the stack, in [Outgoing] slots, consecutively - assigned (1 word for an integer or single argument, 2 words for a double - or a long), starting at word offset 0. - -This convention is not quite that of the ARM EABI, whereas every float -argument are passed in one or two integer registers. Unfortunately, -this does not fit the data model of CompCert. In [PrintAsm.ml] -we insert additional code around function calls and returns that moves -data appropriately. *) - -Definition ireg_param (n: Z) : mreg := - if zeq n (-4) then R0 - else if zeq n (-3) then R1 - else if zeq n (-2) then R2 - else R3. - -Definition freg_param (n: Z) : mreg := - if zeq n (-4) then F0 else F2. - -Definition sreg_param (n: Z) : mreg := - if zeq n (-4) then F0 - else if zeq n (-3) then F1 - else if zeq n (-2) then F2 - else F3. - -Fixpoint loc_arguments_rec (tyl: list typ) (ofs: Z) {struct tyl} : list loc := - match tyl with - | nil => nil - | (Tint | Tany32) as ty :: tys => - (if zle 0 ofs then S Outgoing ofs ty else R (ireg_param ofs)) - :: loc_arguments_rec tys (ofs + 1) - | (Tfloat | Tany64) as ty :: tys => - let ofs := align ofs 2 in - (if zle 0 ofs then S Outgoing ofs ty else R (freg_param ofs)) - :: loc_arguments_rec tys (ofs + 2) - | Tsingle :: tys => - (if zle 0 ofs then S Outgoing ofs Tsingle else R (sreg_param ofs)) - :: loc_arguments_rec tys (ofs + 1) - | Tlong :: tys => - let ofs := align ofs 2 in - (if zle 0 ofs then S Outgoing (ofs + 1) Tint else R (ireg_param (ofs + 1))) - :: (if zle 0 ofs then S Outgoing ofs Tint else R (ireg_param ofs)) - :: loc_arguments_rec tys (ofs + 2) - end. - -(** [loc_arguments s] returns the list of locations where to store arguments - when calling a function with signature [s]. *) - -Definition loc_arguments (s: signature) : list loc := - loc_arguments_rec s.(sig_args) (-4). - -(** [size_arguments s] returns the number of [Outgoing] slots used - to call a function with signature [s]. *) - -Fixpoint size_arguments_rec (tyl: list typ) (ofs: Z) {struct tyl} : Z := - match tyl with - | nil => ofs - | (Tint | Tsingle | Tany32) :: tys => size_arguments_rec tys (ofs + 1) - | (Tfloat | Tlong | Tany64) :: tys => size_arguments_rec tys (align ofs 2 + 2) - end. - -Definition size_arguments (s: signature) : Z := - Zmax 0 (size_arguments_rec s.(sig_args) (-4)). - -(** Argument locations are either non-temporary registers or [Outgoing] - stack slots at nonnegative offsets. *) - -Definition loc_argument_acceptable (l: loc) : Prop := - match l with - | R r => In r destroyed_at_call - | S Outgoing ofs ty => ofs >= 0 /\ ty <> Tlong - | _ => False - end. - -Remark ireg_param_caller_save: - forall n, In (ireg_param n) destroyed_at_call. -Proof. - unfold ireg_param; intros. - destruct (zeq n (-4)). simpl; auto. - destruct (zeq n (-3)). simpl; auto. - destruct (zeq n (-2)); simpl; auto. -Qed. - -Remark freg_param_caller_save: - forall n, In (freg_param n) destroyed_at_call. -Proof. - unfold freg_param; intros. destruct (zeq n (-4)); simpl; OrEq. -Qed. - -Remark sreg_param_caller_save: - forall n, In (sreg_param n) destroyed_at_call. -Proof. - unfold sreg_param; intros. - destruct (zeq n (-4)). simpl; tauto. - destruct (zeq n (-3)). simpl; tauto. - destruct (zeq n (-2)); simpl; tauto. -Qed. - -Remark loc_arguments_rec_charact: - forall tyl ofs l, - In l (loc_arguments_rec tyl ofs) -> - match l with - | R r => In r destroyed_at_call - | S Outgoing ofs' ty => ofs' >= 0 /\ ofs <= ofs' /\ ty <> Tlong - | S _ _ _ => False - end. -Proof. - induction tyl; simpl loc_arguments_rec; intros. - elim H. - destruct a. -- (* Tint *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tfloat *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. auto. congruence. - apply freg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tlong *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tsingle *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply sreg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tany32 *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tany64 *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. auto. congruence. - apply freg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -Qed. - -Lemma loc_arguments_acceptable: - forall (s: signature) (r: loc), - In r (loc_arguments s) -> loc_argument_acceptable r. -Proof. - unfold loc_arguments, loc_argument_acceptable; intros. - generalize (loc_arguments_rec_charact _ _ _ H). - destruct r; auto. - destruct sl; auto. - tauto. -Qed. -Hint Resolve loc_arguments_acceptable: locs. - -(** The offsets of [Outgoing] arguments are below [size_arguments s]. *) - -Remark size_arguments_rec_above: - forall tyl ofs, - ofs <= size_arguments_rec tyl ofs. -Proof. - induction tyl; simpl; intros. - omega. - destruct a. - apply Zle_trans with (ofs + 1); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. - apply Zle_trans with (ofs + 1); auto; omega. - apply Zle_trans with (ofs + 1); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. -Qed. - -Lemma size_arguments_above: - forall s, size_arguments s >= 0. -Proof. - intros; unfold size_arguments. apply Zle_ge. apply Zmax1. -Qed. - -Lemma loc_arguments_bounded: - forall (s: signature) (ofs: Z) (ty: typ), - In (S Outgoing ofs ty) (loc_arguments s) -> - ofs + typesize ty <= size_arguments s. -Proof. - intros. - assert (forall tyl ofs0, - 0 <= ofs0 -> - ofs0 <= Zmax 0 (size_arguments_rec tyl ofs0)). - { - intros. generalize (size_arguments_rec_above tyl ofs0). intros. - rewrite Zmax_spec. rewrite zlt_false. auto. omega. - } - assert (forall tyl ofs0, - In (S Outgoing ofs ty) (loc_arguments_rec tyl ofs0) -> - ofs + typesize ty <= Zmax 0 (size_arguments_rec tyl ofs0)). - { - induction tyl; simpl; intros. - elim H1. - destruct a. - - (* Tint *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tfloat *) - destruct H1; auto. destruct (zle 0 (align ofs0 2)); inv H1. apply H0. omega. - - (* Tlong *) - destruct H1. - destruct (zle 0 (align ofs0 2)); inv H1. - eapply Zle_trans. 2: apply H0. simpl typesize; omega. omega. - destruct H1; auto. - destruct (zle 0 (align ofs0 2)); inv H1. - eapply Zle_trans. 2: apply H0. simpl typesize; omega. omega. - - (* Tsingle *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tany32 *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tany64 *) - destruct H1; auto. destruct (zle 0 (align ofs0 2)); inv H1. apply H0. omega. - } - unfold size_arguments. apply H1. auto. -Qed. -- cgit