179 lines
5.1 KiB
OCaml
179 lines
5.1 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Description of the Intel 386 processor, for Windows NT *)
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open Misc
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open Arch
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open Formatmsg
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open Cmm
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open Reg
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open Mach
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(* Registers available for register allocation *)
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(* Register map:
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eax 0 eax - edi: function arguments and results
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ebx 1 eax: C function results
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ecx 2 ebx, esi, edi, ebp: preserved by C
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edx 3
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esi 4
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edi 5
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ebp 6
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tos 100 top of floating-point stack. *)
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let int_reg_name =
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[| "eax"; "ebx"; "ecx"; "edx"; "esi"; "edi"; "ebp" |]
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let float_reg_name =
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[| "tos" |]
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let num_register_classes = 2
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let register_class r =
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match r.typ with
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Int -> 0
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| Addr -> 0
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| Float -> 1
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let num_available_registers = [| 7; 0 |]
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let first_available_register = [| 0; 100 |]
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let register_name r =
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if r < 100 then int_reg_name.(r) else float_reg_name.(r - 100)
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(* There is little scheduling, and some operations are more compact
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when their argument is %eax. *)
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let rotate_registers = false
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(* Representation of hard registers by pseudo-registers *)
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let hard_int_reg =
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let v = Array.create 7 Reg.dummy in
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for i = 0 to 6 do v.(i) <- Reg.at_location Int (Reg i) done;
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v
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let hard_float_reg = [| Reg.at_location Float (Reg 100) |]
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let all_phys_regs =
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Array.append hard_int_reg hard_float_reg
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let phys_reg n =
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if n < 100 then hard_int_reg.(n) else hard_float_reg.(n - 100)
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let eax = phys_reg 0
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let ecx = phys_reg 2
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let edx = phys_reg 3
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let tos = phys_reg 100
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let stack_slot slot ty =
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Reg.at_location ty (Stack slot)
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(* Instruction selection *)
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let word_addressed = false
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(* Calling conventions *)
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let calling_conventions first_int last_int first_float last_float make_stack
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arg =
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let loc = Array.create (Array.length arg) Reg.dummy in
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let int = ref first_int in
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let float = ref first_float in
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let ofs = ref 0 in
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for i = 0 to Array.length arg - 1 do
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match arg.(i).typ with
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Int | Addr as ty ->
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if !int <= last_int then begin
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loc.(i) <- phys_reg !int;
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incr int
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end else begin
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loc.(i) <- stack_slot (make_stack !ofs) ty;
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ofs := !ofs + size_int
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end
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| Float ->
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if !float <= last_float then begin
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loc.(i) <- phys_reg !float;
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incr float
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end else begin
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loc.(i) <- stack_slot (make_stack !ofs) Float;
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ofs := !ofs + size_float
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end
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done;
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(loc, !ofs)
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let incoming ofs = Incoming ofs
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let outgoing ofs = Outgoing ofs
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let not_supported ofs = fatal_error "Proc.loc_results: cannot call"
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let loc_arguments arg =
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calling_conventions 0 5 100 99 outgoing arg
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let loc_parameters arg =
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let (loc, ofs) = calling_conventions 0 5 100 99 incoming arg in loc
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let loc_results res =
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let (loc, ofs) = calling_conventions 0 5 100 100 not_supported res in loc
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let extcall_use_push = true
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let loc_external_arguments arg =
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fatal_error "Proc.loc_external_arguments"
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let loc_external_results res =
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let (loc, ofs) = calling_conventions 0 0 100 100 not_supported res in loc
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let loc_exn_bucket = eax
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(* Registers destroyed by operations *)
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let destroyed_at_c_call = (* ebx, esi, edi, ebp preserved *)
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Array.of_list(List.map phys_reg [0;2;3])
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let destroyed_at_oper = function
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Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
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| Iop(Iextcall(_, false)) -> destroyed_at_c_call
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| Iop(Iintop(Idiv | Imod)) -> [| eax; edx |]
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| Iop(Iintop_imm(Imod, _)) -> [| eax |]
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| Iop(Ialloc _) -> [| eax |]
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| Iop(Iintop(Icomp _) | Iintop_imm(Icomp _, _)) -> [| eax |]
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| Iop(Iintoffloat) -> [| eax |]
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| Iifthenelse(Ifloattest(_, _), _, _) -> [| eax |]
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| _ -> [||]
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let destroyed_at_raise = all_phys_regs
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(* Maximal register pressure *)
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let safe_register_pressure op = 4
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let max_register_pressure = function
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Iextcall(_, _) -> [| 4; max_int |]
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| Iintop(Idiv | Imod) -> [| 5; max_int |]
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| Ialloc _ | Iintop(Icomp _) | Iintop_imm(Icomp _, _) |
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Iintoffloat -> [| 6; max_int |]
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| _ -> [|7; max_int |]
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(* Layout of the stack frame *)
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let num_stack_slots = [| 0; 0 |]
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let contains_calls = ref false
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(* Calling the assembler *)
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let assemble_file infile outfile =
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Ccomp.command ("ml /nologo /coff /Cp /c /Fo" ^ outfile ^ " " ^ infile ^ ">NUL")
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(* /Cp preserve case of all used identifiers
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/c assemble only
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/Fo output file name *)
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