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(* *********************************************************************)
(* *)
(* 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. *)
(* *)
(* *********************************************************************)
Require Import String.
Require Import Coqlib.
Require Import Decidableplus.
Require Import Maps.
Require Import AST.
Require Import Op.
(** ** Machine registers *)
(** The following type defines the machine registers that can be referenced
as locations. These include:
- Integer registers that can be allocated to RTL pseudo-registers ([Rxx]).
- Floating-point registers that can be allocated to RTL pseudo-registers
([Fxx]).
The type [mreg] does not include reserved machine registers
such as the stack pointer, the link register, and the condition codes. *)
Inductive mreg: Type :=
(** Allocatable integer regs *)
| R0: mreg | R1: mreg | R2: mreg | R3: mreg
| R4: mreg | R5: mreg | R6: mreg | R7: mreg
| R8: mreg | R9: mreg | R10: mreg | R11: mreg
| R12: mreg
(** Allocatable double-precision float regs *)
| F0: mreg | F1: mreg | F2: mreg | F3: mreg
| F4: mreg | F5: mreg | F6: mreg | F7: mreg
| F8: mreg | F9: mreg | F10: mreg | F11: mreg
| F12: mreg | F13: mreg | F14: mreg | F15: mreg.
Lemma mreg_eq: forall (r1 r2: mreg), {r1 = r2} + {r1 <> r2}.
Proof. decide equality. Defined.
Global Opaque mreg_eq.
Definition all_mregs :=
R0 :: R1 :: R2 :: R3 :: R4 :: R5 :: R6 :: R7
:: R8 :: R9 :: R10 :: R11 :: R12
:: F0 :: F1 :: F2 :: F3 :: F4 :: F5 :: F6 :: F7
:: F8 :: F9 :: F10 :: F11 :: F12 :: F13 :: F14 :: F15 :: nil.
Lemma all_mregs_complete:
forall (r: mreg), In r all_mregs.
Proof.
assert (forall r, proj_sumbool (In_dec mreg_eq r all_mregs) = true) by (destruct r; reflexivity).
intros. specialize (H r). InvBooleans. auto.
Qed.
Global Instance Decidable_eq_mreg : forall (x y: mreg), Decidable (eq x y) := Decidable_eq mreg_eq.
Global Instance Finite_mreg : Finite mreg := {
Finite_elements := all_mregs;
Finite_elements_spec := all_mregs_complete
}.
Definition mreg_type (r: mreg): typ :=
match r with
| R0 | R1 | R2 | R3 | R4 | R5 | R6 | R7
| R8 | R9 | R10 | R11 | R12 => Tany32
| F0 | F1 | F2 | F3 | F4 | F5 | F6 | F7
| F8 | F9 | F10 | F11 | F12 | F13 | F14 | F15 => Tany64
end.
Open Scope positive_scope.
Module IndexedMreg <: INDEXED_TYPE.
Definition t := mreg.
Definition eq := mreg_eq.
Definition index (r: mreg): positive :=
match r with
| R0 => 1 | R1 => 2 | R2 => 3 | R3 => 4
| R4 => 5 | R5 => 6 | R6 => 7 | R7 => 8
| R8 => 9 | R9 => 10 | R10 => 11 | R11 => 12
| R12 => 13
| F0 => 14 | F1 => 15 | F2 => 16 | F3 => 17
| F4 => 18 | F5 => 19 | F6 => 20 | F7 => 21
| F8 => 22 | F9 => 23 | F10 => 24 | F11 => 25
| F12 => 26 | F13 => 27 | F14 => 28 | F15 => 29
end.
Lemma index_inj:
forall r1 r2, index r1 = index r2 -> r1 = r2.
Proof.
decide_goal.
Qed.
End IndexedMreg.
Definition is_stack_reg (r: mreg) : bool := false.
(** ** Names of registers *)
Local Open Scope string_scope.
Definition register_names :=
("R0", R0) :: ("R1", R1) :: ("R2", R2) :: ("R3", R3) ::
("R4", R4) :: ("R5", R5) :: ("R6", R6) :: ("R7", R7) ::
("R8", R8) :: ("R9", R9) :: ("R10", R10) :: ("R11", R11) ::
("R12", R12) ::
("F0", F0) :: ("F1", F1) :: ("F2", F2) :: ("F3", F3) ::
("F4", F4) :: ("F5", F5) :: ("F6", F6) :: ("F7", F7) ::
("F8", F8) :: ("F9", F9) :: ("F10", F10) :: ("F11", F11) ::
("F12", F12) ::("F13", F13) ::("F14", F14) :: ("F15", F15) :: nil.
Definition register_by_name (s: string) : option mreg :=
let fix assoc (l: list (string * mreg)) : option mreg :=
match l with
| nil => None
| (s1, r1) :: l' => if string_dec s s1 then Some r1 else assoc l'
end
in assoc register_names.
(** ** Destroyed registers, preferred registers *)
Definition destroyed_by_op (op: operation): list mreg :=
match op with
| Odiv | Odivu => R0 :: R1 :: R2 :: R3 :: R12 :: nil
| Ointoffloat | Ointuoffloat | Ointofsingle | Ointuofsingle => F6 :: nil
| _ => nil
end.
Definition destroyed_by_load (chunk: memory_chunk) (addr: addressing): list mreg :=
nil.
Definition destroyed_by_store (chunk: memory_chunk) (addr: addressing): list mreg := nil.
Definition destroyed_by_cond (cond: condition): list mreg :=
nil.
Definition destroyed_by_jumptable: list mreg :=
nil.
Fixpoint destroyed_by_clobber (cl: list string): list mreg :=
match cl with
| nil => nil
| c1 :: cl =>
match register_by_name c1 with
| Some r => r :: destroyed_by_clobber cl
| None => destroyed_by_clobber cl
end
end.
Definition destroyed_by_builtin (ef: external_function): list mreg :=
match ef with
| EF_memcpy sz al => R2 :: R3 :: R12 :: F7 :: nil
| EF_inline_asm txt sg clob => destroyed_by_clobber clob
| EF_profiling _ _ => R2 :: R3 :: R12 :: nil
| _ => nil
end.
Definition destroyed_by_setstack (ty: typ): list mreg := nil.
Definition destroyed_at_function_entry: list mreg :=
R12 :: nil.
Definition destroyed_at_indirect_call: list mreg :=
R0 :: R1 :: R2 :: R3 :: nil.
Definition temp_for_parent_frame: mreg :=
R12.
Definition mregs_for_operation (op: operation): list (option mreg) * option mreg :=
match op with
| Odiv | Odivu => (Some R0 :: Some R1 :: nil, Some R0)
| _ => (nil, None)
end.
Definition mregs_for_builtin (ef: external_function): list (option mreg) * list(option mreg) :=
(nil, nil).
Global Opaque
destroyed_by_op destroyed_by_load destroyed_by_store
destroyed_by_cond destroyed_by_jumptable destroyed_by_builtin
destroyed_by_setstack destroyed_at_function_entry temp_for_parent_frame
destroyed_at_indirect_call
mregs_for_operation mregs_for_builtin.
(** Two-address operations. Return [true] if the first argument and
the result must be in the same location *and* are unconstrained
by [mregs_for_operation]. There are none for ARM. *)
Definition two_address_op (op: operation) : bool :=
false.
Global Opaque two_address_op.
(* Constraints on constant propagation for builtins *)
Definition builtin_constraints (ef: external_function) :
list builtin_arg_constraint :=
match ef with
| EF_vload _ => OK_addressing :: nil
| EF_vstore _ => OK_addressing :: OK_default :: nil
| EF_memcpy _ _ => OK_addrstack :: OK_addrstack :: nil
| EF_annot kind txt targs => map (fun _ => OK_all) targs
| EF_debug kind txt targs => map (fun _ => OK_all) targs
| _ => nil
end.
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