1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
|
(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* Emission of Intel 386 assembly code *)
module StringSet =
Set.Make(struct type t = string let compare (x:t) y = compare x y end)
open Misc
open Cmm
open Arch
open Proc
open Reg
open Mach
open Linearize
open Emitaux
(* Tradeoff between code size and code speed *)
let fastcode_flag = ref true
let stack_offset = ref 0
(* Layout of the stack frame *)
let frame_size () = (* includes return address *)
let sz =
!stack_offset + 4 * num_stack_slots.(0) + 8 * num_stack_slots.(1) + 4
in Misc.align sz stack_alignment
let slot_offset loc cl =
match loc with
Incoming n ->
assert (n >= 0);
frame_size() + n
| Local n ->
if cl = 0
then !stack_offset + n * 4
else !stack_offset + num_stack_slots.(0) * 4 + n * 8
| Outgoing n ->
assert (n >= 0);
n
let trap_frame_size = Misc.align 8 stack_alignment
(* Prefixing of symbols with "_" *)
let symbol_prefix =
match Config.system with
"linux_elf" -> ""
| "bsd_elf" -> ""
| "solaris" -> ""
| "beos" -> ""
| "gnu" -> ""
| _ -> "_"
let emit_symbol s =
emit_string symbol_prefix; Emitaux.emit_symbol '$' s
(* Output a label *)
let label_prefix =
match Config.system with
"linux_elf" -> ".L"
| "bsd_elf" -> ".L"
| "solaris" -> ".L"
| "beos" -> ".L"
| "gnu" -> ".L"
| _ -> "L"
let emit_label lbl =
emit_string label_prefix; emit_int lbl
let emit_data_label lbl =
emit_string label_prefix; emit_string "d"; emit_int lbl
(* Some data directives have different names under Solaris *)
let word_dir =
match Config.system with
"solaris" -> ".value"
| _ -> ".word"
let skip_dir =
match Config.system with
"solaris" -> ".zero"
| _ -> ".space"
let use_ascii_dir =
match Config.system with
"solaris" -> false
| _ -> true
(* MacOSX has its own way to reference symbols potentially defined in
shared objects *)
let macosx =
match Config.system with
| "macosx" -> true
| _ -> false
(* Output a .align directive.
The numerical argument to .align is log2 of alignment size, except
under ELF, where it is the alignment size... *)
let emit_align =
match Config.system with
"linux_elf" | "bsd_elf" | "solaris" | "beos" | "cygwin" | "mingw" | "gnu" ->
(fun n -> ` .align {emit_int n}\n`)
| _ ->
(fun n -> ` .align {emit_int(Misc.log2 n)}\n`)
let emit_Llabel fallthrough lbl =
if not fallthrough && !fastcode_flag then
emit_align 16 ;
emit_label lbl
(* Output a pseudo-register *)
let emit_reg = function
{ loc = Reg r } ->
emit_string (register_name r)
| { loc = Stack(Incoming n | Outgoing n) } when n < 0 ->
`{emit_symbol "caml_extra_params"} + {emit_int (n + 64)}`
| { loc = Stack s } as r ->
let ofs = slot_offset s (register_class r) in
`{emit_int ofs}(%esp)`
| { loc = Unknown } ->
fatal_error "Emit_i386.emit_reg"
(* Output a reference to the lower 8 bits or lower 16 bits of a register *)
let reg_low_byte_name = [| "%al"; "%bl"; "%cl"; "%dl" |]
let reg_low_half_name = [| "%ax"; "%bx"; "%cx"; "%dx"; "%si"; "%di"; "%bp" |]
let emit_reg8 r =
match r.loc with
Reg r when r < 4 -> emit_string (reg_low_byte_name.(r))
| _ -> fatal_error "Emit_i386.emit_reg8"
let emit_reg16 r =
match r.loc with
Reg r when r < 7 -> emit_string (reg_low_half_name.(r))
| _ -> fatal_error "Emit_i386.emit_reg16"
(* Output an addressing mode *)
let emit_addressing addr r n =
match addr with
Ibased(s, d) ->
`{emit_symbol s}`;
if d <> 0 then ` + {emit_int d}`
| Iindexed d ->
if d <> 0 then emit_int d;
`({emit_reg r.(n)})`
| Iindexed2 d ->
if d <> 0 then emit_int d;
`({emit_reg r.(n)}, {emit_reg r.(n+1)})`
| Iscaled(2, d) ->
if d <> 0 then emit_int d;
`({emit_reg r.(n)}, {emit_reg r.(n)})`
| Iscaled(scale, d) ->
if d <> 0 then emit_int d;
`(, {emit_reg r.(n)}, {emit_int scale})`
| Iindexed2scaled(scale, d) ->
if d <> 0 then emit_int d;
`({emit_reg r.(n)}, {emit_reg r.(n+1)}, {emit_int scale})`
(* Record live pointers at call points *)
let record_frame_label live dbg =
let lbl = new_label() in
let live_offset = ref [] in
Reg.Set.iter
(function
{typ = Addr; loc = Reg r} ->
live_offset := ((r lsl 1) + 1) :: !live_offset
| {typ = Addr; loc = Stack s} as reg ->
live_offset := slot_offset s (register_class reg) :: !live_offset
| _ -> ())
live;
frame_descriptors :=
{ fd_lbl = lbl;
fd_frame_size = frame_size();
fd_live_offset = !live_offset;
fd_debuginfo = dbg } :: !frame_descriptors;
lbl
let record_frame live dbg =
let lbl = record_frame_label live dbg in `{emit_label lbl}:\n`
(* Record calls to the GC -- we've moved them out of the way *)
type gc_call =
{ gc_lbl: label; (* Entry label *)
gc_return_lbl: label; (* Where to branch after GC *)
gc_frame: label } (* Label of frame descriptor *)
let call_gc_sites = ref ([] : gc_call list)
let emit_call_gc gc =
`{emit_label gc.gc_lbl}: call {emit_symbol "caml_call_gc"}\n`;
`{emit_label gc.gc_frame}: jmp {emit_label gc.gc_return_lbl}\n`
(* Record calls to caml_ml_array_bound_error.
In -g mode, we maintain one call to caml_ml_array_bound_error
per bound check site. Without -g, we can share a single call. *)
type bound_error_call =
{ bd_lbl: label; (* Entry label *)
bd_frame: label } (* Label of frame descriptor *)
let bound_error_sites = ref ([] : bound_error_call list)
let bound_error_call = ref 0
let bound_error_label dbg =
if !Clflags.debug then begin
let lbl_bound_error = new_label() in
let lbl_frame = record_frame_label Reg.Set.empty dbg in
bound_error_sites :=
{ bd_lbl = lbl_bound_error; bd_frame = lbl_frame } :: !bound_error_sites;
lbl_bound_error
end else begin
if !bound_error_call = 0 then bound_error_call := new_label();
!bound_error_call
end
let emit_call_bound_error bd =
`{emit_label bd.bd_lbl}: call {emit_symbol "caml_ml_array_bound_error"}\n`;
`{emit_label bd.bd_frame}:\n`
let emit_call_bound_errors () =
List.iter emit_call_bound_error !bound_error_sites;
if !bound_error_call > 0 then
`{emit_label !bound_error_call}: call {emit_symbol "caml_ml_array_bound_error"}\n`
(* Names for instructions *)
let instr_for_intop = function
Iadd -> "addl"
| Isub -> "subl"
| Imul -> "imull"
| Iand -> "andl"
| Ior -> "orl"
| Ixor -> "xorl"
| Ilsl -> "sall"
| Ilsr -> "shrl"
| Iasr -> "sarl"
| _ -> fatal_error "Emit_i386: instr_for_intop"
let instr_for_floatop = function
Inegf -> "fchs"
| Iabsf -> "fabs"
| Iaddf -> "faddl"
| Isubf -> "fsubl"
| Imulf -> "fmull"
| Idivf -> "fdivl"
| Ispecific Isubfrev -> "fsubrl"
| Ispecific Idivfrev -> "fdivrl"
| _ -> fatal_error "Emit_i386: instr_for_floatop"
let instr_for_floatop_reversed = function
Iaddf -> "faddl"
| Isubf -> "fsubrl"
| Imulf -> "fmull"
| Idivf -> "fdivrl"
| Ispecific Isubfrev -> "fsubl"
| Ispecific Idivfrev -> "fdivl"
| _ -> fatal_error "Emit_i386: instr_for_floatop_reversed"
let instr_for_floatop_pop = function
Iaddf -> "faddp"
| Isubf -> "fsubp"
| Imulf -> "fmulp"
| Idivf -> "fdivp"
| Ispecific Isubfrev -> "fsubrp"
| Ispecific Idivfrev -> "fdivrp"
| _ -> fatal_error "Emit_i386: instr_for_floatop_pop"
let instr_for_floatarithmem double = function
Ifloatadd -> if double then "faddl" else "fadds"
| Ifloatsub -> if double then "fsubl" else "fsubs"
| Ifloatsubrev -> if double then "fsubrl" else "fsubrs"
| Ifloatmul -> if double then "fmull" else "fmuls"
| Ifloatdiv -> if double then "fdivl" else "fdivs"
| Ifloatdivrev -> if double then "fdivrl" else "fdivrs"
let name_for_cond_branch = function
Isigned Ceq -> "e" | Isigned Cne -> "ne"
| Isigned Cle -> "le" | Isigned Cgt -> "g"
| Isigned Clt -> "l" | Isigned Cge -> "ge"
| Iunsigned Ceq -> "e" | Iunsigned Cne -> "ne"
| Iunsigned Cle -> "be" | Iunsigned Cgt -> "a"
| Iunsigned Clt -> "b" | Iunsigned Cge -> "ae"
(* Output an = 0 or <> 0 test. *)
let output_test_zero arg =
match arg.loc with
Reg r -> ` testl {emit_reg arg}, {emit_reg arg}\n`
| _ -> ` cmpl $0, {emit_reg arg}\n`
(* Deallocate the stack frame before a return or tail call *)
let output_epilogue f =
let n = frame_size() - 4 in
if n > 0 then
begin
` addl ${emit_int n}, %esp\n`;
cfi_adjust_cfa_offset (-n);
f ();
(* reset CFA back cause function body may continue *)
cfi_adjust_cfa_offset n
end
else
f ()
(* Determine if the given register is the top of the floating-point stack *)
let is_tos = function { loc = Reg _; typ = Float } -> true | _ -> false
(* Emit the code for a floating-point comparison *)
let emit_float_test cmp neg arg lbl =
let actual_cmp =
match (is_tos arg.(0), is_tos arg.(1)) with
(true, true) ->
(* both args on top of FP stack *)
` fcompp\n`;
cmp
| (true, false) ->
(* first arg on top of FP stack *)
` fcompl {emit_reg arg.(1)}\n`;
cmp
| (false, true) ->
(* second arg on top of FP stack *)
` fcompl {emit_reg arg.(0)}\n`;
Cmm.swap_comparison cmp
| (false, false) ->
` fldl {emit_reg arg.(0)}\n`;
` fcompl {emit_reg arg.(1)}\n`;
cmp
in
` fnstsw %ax\n`;
begin match actual_cmp with
Ceq ->
if neg then begin
` andb $68, %ah\n`;
` xorb $64, %ah\n`;
` jne `
end else begin
` andb $69, %ah\n`;
` cmpb $64, %ah\n`;
` je `
end
| Cne ->
if neg then begin
` andb $69, %ah\n`;
` cmpb $64, %ah\n`;
` je `
end else begin
` andb $68, %ah\n`;
` xorb $64, %ah\n`;
` jne `
end
| Cle ->
` andb $69, %ah\n`;
` decb %ah\n`;
` cmpb $64, %ah\n`;
if neg
then ` jae `
else ` jb `
| Cge ->
` andb $5, %ah\n`;
if neg
then ` jne `
else ` je `
| Clt ->
` andb $69, %ah\n`;
` cmpb $1, %ah\n`;
if neg
then ` jne `
else ` je `
| Cgt ->
` andb $69, %ah\n`;
if neg
then ` jne `
else ` je `
end;
`{emit_label lbl}\n`
(* Emit a Ifloatspecial instruction *)
let emit_floatspecial = function
"atan" -> ` fld1; fpatan\n`
| "atan2" -> ` fpatan\n`
| "cos" -> ` fcos\n`
| "log" -> ` fldln2; fxch; fyl2x\n`
| "log10" -> ` fldlg2; fxch; fyl2x\n`
| "sin" -> ` fsin\n`
| "sqrt" -> ` fsqrt\n`
| "tan" -> ` fptan; fstp %st(0)\n`
| _ -> assert false
(* Floating-point constants *)
let float_constants = ref ([] : (int64 * int) list)
let add_float_constant cst =
let repr = Int64.bits_of_float cst in
try
List.assoc repr !float_constants
with
Not_found ->
let lbl = new_label() in
float_constants := (repr, lbl) :: !float_constants;
lbl
let emit_float_constant (cst, lbl) =
`{emit_label lbl}:`;
emit_float64_split_directive ".long" cst
(* Output the assembly code for an instruction *)
(* Name of current function *)
let function_name = ref ""
(* Entry point for tail recursive calls *)
let tailrec_entry_point = ref 0
(* Label of trap for out-of-range accesses *)
let range_check_trap = ref 0
(* Record references to external C functions (for MacOSX) *)
let external_symbols_direct = ref StringSet.empty
let external_symbols_indirect = ref StringSet.empty
let emit_instr fallthrough i =
emit_debug_info i.dbg;
match i.desc with
Lend -> ()
| Lop(Imove | Ispill | Ireload) ->
let src = i.arg.(0) and dst = i.res.(0) in
if src.loc <> dst.loc then begin
if src.typ = Float then
if is_tos src then
` fstpl {emit_reg dst}\n`
else if is_tos dst then
` fldl {emit_reg src}\n`
else begin
` fldl {emit_reg src}\n`;
` fstpl {emit_reg dst}\n`
end
else
` movl {emit_reg src}, {emit_reg dst}\n`
end
| Lop(Iconst_int n | Iconst_blockheader n) ->
if n = 0n then begin
match i.res.(0).loc with
Reg n -> ` xorl {emit_reg i.res.(0)}, {emit_reg i.res.(0)}\n`
| _ -> ` movl $0, {emit_reg i.res.(0)}\n`
end else
` movl ${emit_nativeint n}, {emit_reg i.res.(0)}\n`
| Lop(Iconst_float f) ->
begin match Int64.bits_of_float f with
| 0x0000_0000_0000_0000L -> (* +0.0 *)
` fldz\n`
| 0x8000_0000_0000_0000L -> (* -0.0 *)
` fldz\n fchs\n`
| 0x3FF0_0000_0000_0000L -> (* 1.0 *)
` fld1\n`
| 0xBFF0_0000_0000_0000L -> (* -1.0 *)
` fld1\n fchs\n`
| _ ->
let lbl = add_float_constant f in
` fldl {emit_label lbl}\n`
end
| Lop(Iconst_symbol s) ->
` movl ${emit_symbol s}, {emit_reg i.res.(0)}\n`
| Lop(Icall_ind) ->
` call *{emit_reg i.arg.(0)}\n`;
record_frame i.live i.dbg
| Lop(Icall_imm s) ->
` call {emit_symbol s}\n`;
record_frame i.live i.dbg
| Lop(Itailcall_ind) ->
output_epilogue begin fun () ->
` jmp *{emit_reg i.arg.(0)}\n`
end
| Lop(Itailcall_imm s) ->
if s = !function_name then
` jmp {emit_label !tailrec_entry_point}\n`
else begin
output_epilogue begin fun () ->
` jmp {emit_symbol s}\n`
end
end
| Lop(Iextcall(s, alloc)) ->
if alloc then begin
if not macosx then
` movl ${emit_symbol s}, %eax\n`
else begin
external_symbols_indirect :=
StringSet.add s !external_symbols_indirect;
` movl L{emit_symbol s}$non_lazy_ptr, %eax\n`
end;
` call {emit_symbol "caml_c_call"}\n`;
record_frame i.live i.dbg
end else begin
if not macosx then
` call {emit_symbol s}\n`
else begin
external_symbols_direct :=
StringSet.add s !external_symbols_direct;
` call L{emit_symbol s}$stub\n`
end
end
| Lop(Istackoffset n) ->
if n < 0
then ` addl ${emit_int(-n)}, %esp\n`
else ` subl ${emit_int(n)}, %esp\n`;
cfi_adjust_cfa_offset n;
stack_offset := !stack_offset + n
| Lop(Iload(chunk, addr)) ->
let dest = i.res.(0) in
begin match chunk with
| Word | Thirtytwo_signed | Thirtytwo_unsigned ->
` movl {emit_addressing addr i.arg 0}, {emit_reg dest}\n`
| Byte_unsigned ->
` movzbl {emit_addressing addr i.arg 0}, {emit_reg dest}\n`
| Byte_signed ->
` movsbl {emit_addressing addr i.arg 0}, {emit_reg dest}\n`
| Sixteen_unsigned ->
` movzwl {emit_addressing addr i.arg 0}, {emit_reg dest}\n`
| Sixteen_signed ->
` movswl {emit_addressing addr i.arg 0}, {emit_reg dest}\n`
| Single ->
` flds {emit_addressing addr i.arg 0}\n`
| Double | Double_u ->
` fldl {emit_addressing addr i.arg 0}\n`
end
| Lop(Istore(chunk, addr, _)) ->
begin match chunk with
| Word | Thirtytwo_signed | Thirtytwo_unsigned ->
` movl {emit_reg i.arg.(0)}, {emit_addressing addr i.arg 1}\n`
| Byte_unsigned | Byte_signed ->
` movb {emit_reg8 i.arg.(0)}, {emit_addressing addr i.arg 1}\n`
| Sixteen_unsigned | Sixteen_signed ->
` movw {emit_reg16 i.arg.(0)}, {emit_addressing addr i.arg 1}\n`
| Single ->
if is_tos i.arg.(0) then
` fstps {emit_addressing addr i.arg 1}\n`
else begin
` fldl {emit_reg i.arg.(0)}\n`;
` fstps {emit_addressing addr i.arg 1}\n`
end
| Double | Double_u ->
if is_tos i.arg.(0) then
` fstpl {emit_addressing addr i.arg 1}\n`
else begin
` fldl {emit_reg i.arg.(0)}\n`;
` fstpl {emit_addressing addr i.arg 1}\n`
end
end
| Lop(Ialloc n) ->
if !fastcode_flag then begin
let lbl_redo = new_label() in
`{emit_label lbl_redo}: movl {emit_symbol "caml_young_ptr"}, %eax\n`;
` subl ${emit_int n}, %eax\n`;
` movl %eax, {emit_symbol "caml_young_ptr"}\n`;
` cmpl {emit_symbol "caml_young_limit"}, %eax\n`;
let lbl_call_gc = new_label() in
let lbl_frame = record_frame_label i.live Debuginfo.none in
` jb {emit_label lbl_call_gc}\n`;
` leal 4(%eax), {emit_reg i.res.(0)}\n`;
call_gc_sites :=
{ gc_lbl = lbl_call_gc;
gc_return_lbl = lbl_redo;
gc_frame = lbl_frame } :: !call_gc_sites
end else begin
begin match n with
8 -> ` call {emit_symbol "caml_alloc1"}\n`
| 12 -> ` call {emit_symbol "caml_alloc2"}\n`
| 16 -> ` call {emit_symbol "caml_alloc3"}\n`
| _ -> ` movl ${emit_int n}, %eax\n`;
` call {emit_symbol "caml_allocN"}\n`
end;
`{record_frame i.live Debuginfo.none} leal 4(%eax), {emit_reg i.res.(0)}\n`
end
| Lop(Iintop(Icomp cmp)) ->
` cmpl {emit_reg i.arg.(1)}, {emit_reg i.arg.(0)}\n`;
let b = name_for_cond_branch cmp in
` set{emit_string b} %al\n`;
` movzbl %al, {emit_reg i.res.(0)}\n`
| Lop(Iintop_imm(Icomp cmp, n)) ->
` cmpl ${emit_int n}, {emit_reg i.arg.(0)}\n`;
let b = name_for_cond_branch cmp in
` set{emit_string b} %al\n`;
` movzbl %al, {emit_reg i.res.(0)}\n`
| Lop(Iintop Icheckbound) ->
let lbl = bound_error_label i.dbg in
` cmpl {emit_reg i.arg.(1)}, {emit_reg i.arg.(0)}\n`;
` jbe {emit_label lbl}\n`
| Lop(Iintop_imm(Icheckbound, n)) ->
let lbl = bound_error_label i.dbg in
` cmpl ${emit_int n}, {emit_reg i.arg.(0)}\n`;
` jbe {emit_label lbl}\n`
| Lop(Iintop(Idiv | Imod)) ->
` cltd\n`;
` idivl {emit_reg i.arg.(1)}\n`
| Lop(Iintop(Ilsl | Ilsr | Iasr as op)) ->
(* We have i.arg.(0) = i.res.(0) and i.arg.(1) = %ecx *)
` {emit_string(instr_for_intop op)} %cl, {emit_reg i.res.(0)}\n`
| Lop(Iintop Imulh) ->
` imull {emit_reg i.arg.(1)}\n`
| Lop(Iintop op) ->
(* We have i.arg.(0) = i.res.(0) *)
` {emit_string(instr_for_intop op)} {emit_reg i.arg.(1)}, {emit_reg i.res.(0)}\n`
| Lop(Iintop_imm(Iadd, n)) when i.arg.(0).loc <> i.res.(0).loc ->
` leal {emit_int n}({emit_reg i.arg.(0)}), {emit_reg i.res.(0)}\n`
| Lop(Iintop_imm(Iadd, 1) | Iintop_imm(Isub, -1)) ->
` incl {emit_reg i.res.(0)}\n`
| Lop(Iintop_imm(Iadd, -1) | Iintop_imm(Isub, 1)) ->
` decl {emit_reg i.res.(0)}\n`
| Lop(Iintop_imm(op, n)) ->
(* We have i.arg.(0) = i.res.(0) *)
` {emit_string(instr_for_intop op)} ${emit_int n}, {emit_reg i.res.(0)}\n`
| Lop(Inegf | Iabsf as floatop) ->
if not (is_tos i.arg.(0)) then
` fldl {emit_reg i.arg.(0)}\n`;
` {emit_string(instr_for_floatop floatop)}\n`
| Lop(Iaddf | Isubf | Imulf | Idivf | Ispecific(Isubfrev | Idivfrev)
as floatop) ->
begin match (is_tos i.arg.(0), is_tos i.arg.(1)) with
(true, true) ->
(* both operands on top of FP stack *)
` {emit_string(instr_for_floatop_pop floatop)} %st, %st(1)\n`
| (true, false) ->
(* first operand on stack *)
` {emit_string(instr_for_floatop floatop)} {emit_reg i.arg.(1)}\n`
| (false, true) ->
(* second operand on stack *)
` {emit_string(instr_for_floatop_reversed floatop)} {emit_reg i.arg.(0)}\n`
| (false, false) ->
(* both operands in memory *)
` fldl {emit_reg i.arg.(0)}\n`;
` {emit_string(instr_for_floatop floatop)} {emit_reg i.arg.(1)}\n`
end
| Lop(Ifloatofint) ->
begin match i.arg.(0).loc with
Stack s ->
` fildl {emit_reg i.arg.(0)}\n`
| _ ->
` pushl {emit_reg i.arg.(0)}\n`;
` fildl (%esp)\n`;
` addl $4, %esp\n`
end
| Lop(Iintoffloat) ->
if not (is_tos i.arg.(0)) then
` fldl {emit_reg i.arg.(0)}\n`;
stack_offset := !stack_offset - 8;
` subl $8, %esp\n`;
cfi_adjust_cfa_offset 8;
` fnstcw 4(%esp)\n`;
` movw 4(%esp), %ax\n`;
` movb $12, %ah\n`;
` movw %ax, 0(%esp)\n`;
` fldcw 0(%esp)\n`;
begin match i.res.(0).loc with
Stack s ->
` fistpl {emit_reg i.res.(0)}\n`
| _ ->
` fistpl (%esp)\n`;
` movl (%esp), {emit_reg i.res.(0)}\n`
end;
` fldcw 4(%esp)\n`;
` addl $8, %esp\n`;
cfi_adjust_cfa_offset (-8);
stack_offset := !stack_offset + 8
| Lop(Ispecific(Ilea addr)) ->
` lea {emit_addressing addr i.arg 0}, {emit_reg i.res.(0)}\n`
| Lop(Ispecific(Istore_int(n, addr, _))) ->
` movl ${emit_nativeint n}, {emit_addressing addr i.arg 0}\n`
| Lop(Ispecific(Istore_symbol(s, addr, _))) ->
` movl ${emit_symbol s}, {emit_addressing addr i.arg 0}\n`
| Lop(Ispecific(Ioffset_loc(n, addr))) ->
` addl ${emit_int n}, {emit_addressing addr i.arg 0}\n`
| Lop(Ispecific(Ipush)) ->
(* Push arguments in reverse order *)
for n = Array.length i.arg - 1 downto 0 do
let r = i.arg.(n) in
match r with
{loc = Reg _; typ = Float} ->
` subl $8, %esp\n`;
cfi_adjust_cfa_offset 8;
` fstpl 0(%esp)\n`;
stack_offset := !stack_offset + 8
| {loc = Stack sl; typ = Float} ->
let ofs = slot_offset sl 1 in
` pushl {emit_int(ofs + 4)}(%esp)\n`;
` pushl {emit_int(ofs + 4)}(%esp)\n`;
cfi_adjust_cfa_offset 8;
stack_offset := !stack_offset + 8
| _ ->
` pushl {emit_reg r}\n`;
cfi_adjust_cfa_offset 4;
stack_offset := !stack_offset + 4
done
| Lop(Ispecific(Ipush_int n)) ->
` pushl ${emit_nativeint n}\n`;
cfi_adjust_cfa_offset 4;
stack_offset := !stack_offset + 4
| Lop(Ispecific(Ipush_symbol s)) ->
` pushl ${emit_symbol s}\n`;
cfi_adjust_cfa_offset 4;
stack_offset := !stack_offset + 4
| Lop(Ispecific(Ipush_load addr)) ->
` pushl {emit_addressing addr i.arg 0}\n`;
cfi_adjust_cfa_offset 4;
stack_offset := !stack_offset + 4
| Lop(Ispecific(Ipush_load_float addr)) ->
` pushl {emit_addressing (offset_addressing addr 4) i.arg 0}\n`;
` pushl {emit_addressing addr i.arg 0}\n`;
cfi_adjust_cfa_offset 8;
stack_offset := !stack_offset + 8
| Lop(Ispecific(Ifloatarithmem(double, op, addr))) ->
if not (is_tos i.arg.(0)) then
` fldl {emit_reg i.arg.(0)}\n`;
` {emit_string(instr_for_floatarithmem double op)} {emit_addressing addr i.arg 1}\n`
| Lop(Ispecific(Ifloatspecial s)) ->
(* Push args on float stack if necessary *)
for k = 0 to Array.length i.arg - 1 do
if not (is_tos i.arg.(k)) then ` fldl {emit_reg i.arg.(k)}\n`
done;
(* Fix-up for binary instrs whose args were swapped *)
if Array.length i.arg = 2 && is_tos i.arg.(1) then
` fxch %st(1)\n`;
emit_floatspecial s
| Lreloadretaddr ->
()
| Lreturn ->
output_epilogue begin fun () ->
` ret\n`
end
| Llabel lbl ->
`{emit_Llabel fallthrough lbl}:\n`
| Lbranch lbl ->
` jmp {emit_label lbl}\n`
| Lcondbranch(tst, lbl) ->
begin match tst with
Itruetest ->
output_test_zero i.arg.(0);
` jne {emit_label lbl}\n`
| Ifalsetest ->
output_test_zero i.arg.(0);
` je {emit_label lbl}\n`
| Iinttest cmp ->
` cmpl {emit_reg i.arg.(1)}, {emit_reg i.arg.(0)}\n`;
let b = name_for_cond_branch cmp in
` j{emit_string b} {emit_label lbl}\n`
| Iinttest_imm((Isigned Ceq | Isigned Cne |
Iunsigned Ceq | Iunsigned Cne) as cmp, 0) ->
output_test_zero i.arg.(0);
let b = name_for_cond_branch cmp in
` j{emit_string b} {emit_label lbl}\n`
| Iinttest_imm(cmp, n) ->
` cmpl ${emit_int n}, {emit_reg i.arg.(0)}\n`;
let b = name_for_cond_branch cmp in
` j{emit_string b} {emit_label lbl}\n`
| Ifloattest(cmp, neg) ->
emit_float_test cmp neg i.arg lbl
| Ioddtest ->
` testl $1, {emit_reg i.arg.(0)}\n`;
` jne {emit_label lbl}\n`
| Ieventest ->
` testl $1, {emit_reg i.arg.(0)}\n`;
` je {emit_label lbl}\n`
end
| Lcondbranch3(lbl0, lbl1, lbl2) ->
` cmpl $1, {emit_reg i.arg.(0)}\n`;
begin match lbl0 with
None -> ()
| Some lbl -> ` jb {emit_label lbl}\n`
end;
begin match lbl1 with
None -> ()
| Some lbl -> ` je {emit_label lbl}\n`
end;
begin match lbl2 with
None -> ()
| Some lbl -> ` jg {emit_label lbl}\n`
end
| Lswitch jumptbl ->
let lbl = new_label() in
` jmp *{emit_label lbl}(, {emit_reg i.arg.(0)}, 4)\n`;
` .data\n`;
`{emit_label lbl}:`;
for i = 0 to Array.length jumptbl - 1 do
` .long {emit_label jumptbl.(i)}\n`
done;
` .text\n`
| Lsetuptrap lbl ->
` call {emit_label lbl}\n`
| Lpushtrap ->
if trap_frame_size > 8 then
` subl ${emit_int (trap_frame_size - 8)}, %esp\n`;
` pushl {emit_symbol "caml_exception_pointer"}\n`;
cfi_adjust_cfa_offset trap_frame_size;
` movl %esp, {emit_symbol "caml_exception_pointer"}\n`;
stack_offset := !stack_offset + trap_frame_size
| Lpoptrap ->
` popl {emit_symbol "caml_exception_pointer"}\n`;
` addl ${emit_int (trap_frame_size - 4)}, %esp\n`;
cfi_adjust_cfa_offset (-trap_frame_size);
stack_offset := !stack_offset - trap_frame_size
| Lraise k ->
begin match !Clflags.debug, k with
| true, Lambda.Raise_regular ->
` call {emit_symbol "caml_raise_exn"}\n`;
record_frame Reg.Set.empty i.dbg
| true, Lambda.Raise_reraise ->
` call {emit_symbol "caml_reraise_exn"}\n`;
record_frame Reg.Set.empty i.dbg
| false, _
| true, Lambda.Raise_notrace ->
` movl {emit_symbol "caml_exception_pointer"}, %esp\n`;
` popl {emit_symbol "caml_exception_pointer"}\n`;
if trap_frame_size > 8 then
` addl ${emit_int (trap_frame_size - 8)}, %esp\n`;
` ret\n`
end
let rec emit_all fallthrough i =
match i.desc with
| Lend -> ()
| _ ->
emit_instr fallthrough i;
emit_all
(Linearize.has_fallthrough i.desc)
i.next
(* Emission of external symbol references (for MacOSX) *)
let emit_external_symbol_direct s =
`L{emit_symbol s}$stub:\n`;
` .indirect_symbol {emit_symbol s}\n`;
` hlt ; hlt ; hlt ; hlt ; hlt\n`
let emit_external_symbol_indirect s =
`L{emit_symbol s}$non_lazy_ptr:\n`;
` .indirect_symbol {emit_symbol s}\n`;
` .long 0\n`
let emit_external_symbols () =
` .section __IMPORT,__pointers,non_lazy_symbol_pointers\n`;
StringSet.iter emit_external_symbol_indirect !external_symbols_indirect;
external_symbols_indirect := StringSet.empty;
` .section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5\n`;
StringSet.iter emit_external_symbol_direct !external_symbols_direct;
external_symbols_direct := StringSet.empty;
if !Clflags.gprofile then begin
`Lmcount$stub:\n`;
` .indirect_symbol mcount\n`;
` hlt ; hlt ; hlt ; hlt ; hlt\n`
end
(* Emission of the profiling prelude *)
let emit_profile () =
match Config.system with
"linux_elf" | "gnu" ->
` pushl %eax\n`;
` movl %esp, %ebp\n`;
` pushl %ecx\n`;
` pushl %edx\n`;
` call {emit_symbol "mcount"}\n`;
` popl %edx\n`;
` popl %ecx\n`;
` popl %eax\n`
| "bsd_elf" ->
` pushl %eax\n`;
` movl %esp, %ebp\n`;
` pushl %ecx\n`;
` pushl %edx\n`;
` call .mcount\n`;
` popl %edx\n`;
` popl %ecx\n`;
` popl %eax\n`
| "macosx" ->
` pushl %eax\n`;
` movl %esp, %ebp\n`;
` pushl %ecx\n`;
` pushl %edx\n`;
` call Lmcount$stub\n`;
` popl %edx\n`;
` popl %ecx\n`;
` popl %eax\n`
| _ -> () (*unsupported yet*)
(* Emission of a function declaration *)
let fundecl fundecl =
function_name := fundecl.fun_name;
fastcode_flag := fundecl.fun_fast;
tailrec_entry_point := new_label();
stack_offset := 0;
call_gc_sites := [];
bound_error_sites := [];
bound_error_call := 0;
` .text\n`;
emit_align 16;
if macosx
&& not !Clflags.output_c_object
&& is_generic_function fundecl.fun_name
then (* PR#4690 *)
` .private_extern {emit_symbol fundecl.fun_name}\n`
else
` .globl {emit_symbol fundecl.fun_name}\n`;
`{emit_symbol fundecl.fun_name}:\n`;
emit_debug_info fundecl.fun_dbg;
cfi_startproc ();
if !Clflags.gprofile then emit_profile();
let n = frame_size() - 4 in
if n > 0 then
begin
` subl ${emit_int n}, %esp\n`;
cfi_adjust_cfa_offset n;
end;
`{emit_label !tailrec_entry_point}:\n`;
emit_all true fundecl.fun_body;
List.iter emit_call_gc !call_gc_sites;
emit_call_bound_errors ();
cfi_endproc ();
begin match Config.system with
"linux_elf" | "bsd_elf" | "gnu" ->
` .type {emit_symbol fundecl.fun_name},@function\n`;
` .size {emit_symbol fundecl.fun_name},.-{emit_symbol fundecl.fun_name}\n`
| _ -> () end
(* Emission of data *)
let emit_item = function
Cglobal_symbol s ->
` .globl {emit_symbol s}\n`;
| Cdefine_symbol s ->
`{emit_symbol s}:\n`
| Cdefine_label lbl ->
`{emit_data_label lbl}:\n`
| Cint8 n ->
` .byte {emit_int n}\n`
| Cint16 n ->
` {emit_string word_dir} {emit_int n}\n`
| Cint32 n ->
` .long {emit_nativeint n}\n`
| Cint n ->
` .long {emit_nativeint n}\n`
| Csingle f ->
emit_float32_directive ".long" (Int32.bits_of_float f)
| Cdouble f ->
emit_float64_split_directive ".long" (Int64.bits_of_float f)
| Csymbol_address s ->
` .long {emit_symbol s}\n`
| Clabel_address lbl ->
` .long {emit_data_label lbl}\n`
| Cstring s ->
if use_ascii_dir
then emit_string_directive " .ascii " s
else emit_bytes_directive " .byte " s
| Cskip n ->
if n > 0 then ` {emit_string skip_dir} {emit_int n}\n`
| Calign n ->
emit_align n
let data l =
` .data\n`;
List.iter emit_item l
(* Beginning / end of an assembly file *)
let begin_assembly() =
reset_debug_info(); (* PR#5603 *)
float_constants := [];
` .file \"{emit_string (String.escaped !Location.input_name)}\"\n`;
let lbl_begin = Compilenv.make_symbol (Some "data_begin") in
` .data\n`;
` .globl {emit_symbol lbl_begin}\n`;
`{emit_symbol lbl_begin}:\n`;
let lbl_begin = Compilenv.make_symbol (Some "code_begin") in
` .text\n`;
` .globl {emit_symbol lbl_begin}\n`;
`{emit_symbol lbl_begin}:\n`;
if macosx then ` nop\n` (* PR#4690 *)
let end_assembly() =
if !float_constants <> [] then begin
` .data\n`;
List.iter emit_float_constant !float_constants
end;
let lbl_end = Compilenv.make_symbol (Some "code_end") in
` .text\n`;
if macosx then ` nop\n`; (* suppress "ld warning: atom sorting error" *)
` .globl {emit_symbol lbl_end}\n`;
`{emit_symbol lbl_end}:\n`;
` .data\n`;
let lbl_end = Compilenv.make_symbol (Some "data_end") in
` .globl {emit_symbol lbl_end}\n`;
`{emit_symbol lbl_end}:\n`;
` .long 0\n`;
let lbl = Compilenv.make_symbol (Some "frametable") in
` .globl {emit_symbol lbl}\n`;
`{emit_symbol lbl}:\n`;
emit_frames
{ efa_label = (fun l -> ` .long {emit_label l}\n`);
efa_16 = (fun n -> ` {emit_string word_dir} {emit_int n}\n`);
efa_32 = (fun n -> ` .long {emit_int32 n}\n`);
efa_word = (fun n -> ` .long {emit_int n}\n`);
efa_align = emit_align;
efa_label_rel = (fun lbl ofs ->
` .long {emit_label lbl} - . + {emit_int32 ofs}\n`);
efa_def_label = (fun l -> `{emit_label l}:\n`);
efa_string = (fun s ->
let s = s ^ "\000" in
if use_ascii_dir
then emit_string_directive " .ascii " s
else emit_bytes_directive " .byte " s) };
if macosx then emit_external_symbols ();
if Config.system = "linux_elf" then
(* Mark stack as non-executable, PR#4564 *)
`\n .section .note.GNU-stack,\"\",%progbits\n`
|