Mu - apps/crenshaw2-1.subx

From 3350c34a74844e21ea69077e01efff3bae64bdcd Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Tue, 23 Mar 2021 17:31:08 -0700 Subject: . --- html/apps/crenshaw2-1.subx.html | 621 ---------------------------------------- 1 file changed, 621 deletions(-) delete mode 100644 html/apps/crenshaw2-1.subx.html (limited to 'html/apps/crenshaw2-1.subx.html') diff --git a/html/apps/crenshaw2-1.subx.html b/html/apps/crenshaw2-1.subx.html deleted file mode 100644 index 387e33a4..00000000 --- a/html/apps/crenshaw2-1.subx.html +++ /dev/null @@ -1,621 +0,0 @@ - - - - -Mu - apps/crenshaw2-1.subx - - - - - - - - - - -https://github.com/akkartik/mu/blob/main/apps/crenshaw2-1.subx -
-  1 # Port of https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas
-  2 # which corresponds to the section "single digits" in https://compilers.iecc.com/crenshaw/tutor2.txt
-  3 # except that we support hex digits.
-  4 #
-  5 # To run:
-  6 #   $ ./bootstrap translate init.linux 0*.subx apps/crenshaw2-1.subx -o apps/crenshaw2-1
-  7 #   $ echo '3'  |./bootstrap run apps/crenshaw2-1
-  8 # Expected output:
-  9 #   # syscall(exit, 3)
- 10 #   bb/copy-to-ebx  3/imm32
- 11 #   b8/copy-to-eax  1/imm32/exit
- 12 #   cd/syscall  0x80/imm8
- 13 #
- 14 # To run the generated output:
- 15 #   $ echo '3'  |./bootstrap run apps/crenshaw2-1 > z1.subx
- 16 #   $ ./bootstrap translate init.linux z1.subx -o z1
- 17 #   $ ./bootstrap run z1
- 18 #   $ echo $?
- 19 #   3
- 20 #
- 21 # Stdin must contain just a single hex digit. Other input will print an error:
- 22 #   $ echo 'xyz'  |./bootstrap run apps/crenshaw2-1
- 23 #   Error: integer expected
- 24 #
- 25 # Names in this file sometimes follow Crenshaw's original rather than my usual
- 26 # naming conventions.
- 27 
- 28 == code
- 29 #   instruction                     effective address                                                   register    displacement    immediate
- 30 # . op          subop               mod             rm32          base        index         scale       r32
- 31 # . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
- 32 
- 33 Entry:  # run tests if necessary, call 'compile' if not
- 34     # . prologue
- 35     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
- 36 
- 37     # initialize heap
- 38     # . Heap = new-segment(Heap-size)
- 39     # . . push args
- 40     68/push  Heap/imm32
- 41     ff          6/subop/push        0/mod/indirect  5/rm32/.disp32            .             .           .           Heap-size/disp32                  # push *Heap-size
- 42     # . . call
- 43     e8/call  new-segment/disp32
- 44     # . . discard args
- 45     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
- 46 
- 47     # - if argc > 1 and argv[1] == "test", then return run_tests()
- 48     # if (argc <= 1) goto run-main
- 49     81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0/disp8         1/imm32           # compare *ebp
- 50     7e/jump-if-<=  $run-main/disp8
- 51     # if (!kernel-string-equal?(argv[1], "test")) goto run-main
- 52     # . eax = kernel-string-equal?(argv[1], "test")
- 53     # . . push args
- 54     68/push  "test"/imm32
- 55     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
- 56     # . . call
- 57     e8/call  kernel-string-equal?/disp32
- 58     # . . discard args
- 59     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
- 60     # . if (eax == false) goto run-main
- 61     3d/compare-eax-and  0/imm32/false
- 62     74/jump-if-=  $run-main/disp8
- 63     # run-tests()
- 64     e8/call  run-tests/disp32
- 65     # syscall(exit, *Num-test-failures)
- 66     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           3/r32/ebx   Num-test-failures/disp32          # copy *Num-test-failures to ebx
- 67     eb/jump  $main:end/disp8
- 68 $run-main:
- 69     # - otherwise read a program from stdin and emit its translation to stdout
- 70     # . compile(Stdin, 1/stdout, 2/stderr, ed)
- 71     # . . push args
- 72     68/push  0/imm32/exit-descriptor
- 73     68/push  2/imm32/stderr
- 74     68/push  1/imm32/stdout
- 75     68/push  Stdin/imm32
- 76     # . . call
- 77     e8/call  compile/disp32
- 78     # . . discard args
- 79     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
- 80     # syscall(exit, 0)
- 81     bb/copy-to-ebx  0/imm32
- 82 $main:end:
- 83     e8/call  syscall_exit/disp32
- 84 
- 85 # the main entry point
- 86 compile:  # in: (addr buffered-file), out: fd or (addr stream byte), err: fd or (addr stream byte), ed: (addr exit-descriptor)
- 87     # . prologue
- 88     55/push-ebp
- 89     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
- 90     # . save registers
- 91     50/push-eax
- 92     51/push-ecx
- 93     # prime the pump
- 94     # . Look = get-char(in)
- 95     # . . push args
- 96     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8      .                    # push *(ebp+8)
- 97     # . . call
- 98     e8/call  get-char/disp32
- 99     # . . discard args
-100     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-101     # var num/ecx: (stream byte 7)
-102     # Numbers can be 32 bits or 8 hex bytes long. One of them will be in 'Look', so we need space for 7 bytes.
-103     # Sizing the stream just right buys us overflow-handling for free inside 'get-num'.
-104     # Add 12 bytes for 'read', 'write' and 'size' fields, for a total of 19 bytes, or 0x13 in hex.
-105     # The stack pointer is no longer aligned, so dump_stack() can be misleading past this point.
-106     81          5/subop/subtract    3/mod/direct    4/rm32/esp    .           .             .           .           .               0x13/imm32        # subtract from esp
-107     89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-108     # initialize the stream
-109     # . num->size = 7
-110     c7          0/subop/copy        1/mod/*+disp8   1/rm32/ecx    .           .             .           .           8/disp8         7/imm32           # copy to *(ecx+8)
-111     # . clear-stream(num)
-112     # . . push args
-113     51/push-ecx
-114     # . . call
-115     e8/call  clear-stream/disp32
-116     # . . discard args
-117     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-118     # read a digit from 'in' into 'num'
-119     # . get-num(in, num, err, ed)
-120     # . . push args
-121     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x14/disp8      .                 # push *(ebp+20)
-122     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x10/disp8      .                 # push *(ebp+16)
-123     51/push-ecx/num
-124     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8      .                    # push *(ebp+8)
-125     # . . call
-126     e8/call  get-num/disp32
-127     # . . discard args
-128     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
-129     # render 'num' into the following template on 'out':
-130     #   bb/copy-to-ebx  _num_
-131     #   b8/copy-to-eax  1/imm32/exit
-132     #   cd/syscall  0x80/imm8
-133     #
-134     # . write(out, "bb/copy-to-ebx  ")
-135     # . . push args
-136     68/push  "bb/copy-to-ebx  "/imm32
-137     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-138     # . . call
-139     e8/call  write/disp32
-140     # . . discard args
-141     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-142     # . write-stream(out, num)
-143     # . . push args
-144     51/push-ecx/num
-145     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-146     # . . call
-147     e8/call  write-stream/disp32
-148     # . . discard args
-149     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-150     # . write(out, Newline)
-151     # . . push args
-152     68/push  Newline/imm32
-153     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-154     # . . call
-155     e8/call  write/disp32
-156     # . . discard args
-157     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-158     # . write(out, "b8/copy-to-eax  1/imm32/exit\n")
-159     # . . push args
-160     68/push  "b8/copy-to-eax  1/imm32/exit\n"/imm32
-161     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-162     # . . call
-163     e8/call  write/disp32
-164     # . . discard args
-165     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-166     # . write(out, "cd/syscall  0x80/imm8\n")
-167     # . . push args
-168     68/push  "cd/syscall  0x80/imm8\n"/imm32
-169     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-170     # . . call
-171     e8/call  write/disp32
-172     # . . discard args
-173     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-174 $compile:end:
-175     # . restore registers
-176     59/pop-to-ecx
-177     58/pop-to-eax
-178     # . epilogue
-179     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-180     5d/pop-to-ebp
-181     c3/return
-182 
-183 # Read a single digit into 'out'. Abort if there are none, or if there is no
-184 # space in 'out'.
-185 # Input comes from the global variable 'Look' (first byte) and the argument
-186 # 'in' (rest). We leave the next byte from 'in' into 'Look' on exit.
-187 get-num:  # in: (addr buffered-file), out: (addr stream byte), err: fd or (addr stream byte), ed: (addr exit-descriptor)
-188     # pseudocode:
-189     #   if (!is-digit?(Look)) expected(ed, err, "integer")
-190     #   if out->write >= out->size
-191     #     write(err, "Error: too many digits in number\n")
-192     #     stop(ed, 1)
-193     #   out->data[out->write] = LSB(Look)
-194     #   ++out->write
-195     #   Look = get-char(in)
-196     #
-197     # registers:
-198     #   in: esi
-199     #   out: edi
-200     #   out->write: ecx (cached copy; need to keep in sync)
-201     #   out->size: edx
-202     #   temporaries: eax, ebx
-203     # We can't allocate Look to a register because it gets written implicitly in
-204     # get-char in each iteration of the loop. (Thereby demonstrating that it's
-205     # not the right interface for us. But we'll keep it just to follow Crenshaw.)
-206     #
-207     # . prologue
-208     55/push-ebp
-209     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-210     # - if (is-digit?(Look)) expected(ed, err, "integer")
-211     # . eax = is-digit?(Look)
-212     # . . push args
-213     ff          6/subop/push        0/mod/indirect  5/rm32/.disp32            .             .           .           Look/disp32     .                 # push *Look
-214     # . . call
-215     e8/call  is-digit?/disp32
-216     # . . discard args
-217     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-218     # . if (eax == false)
-219     3d/compare-eax-and  0/imm32/false
-220     75/jump-if-!=  $get-num:main/disp8
-221     # . expected(ed, err, "integer")
-222     # . . push args
-223     68/push  "integer"/imm32
-224     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x10/disp8      .                 # push *(ebp+16)
-225     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x14/disp8      .                 # push *(ebp+20)
-226     # . . call
-227     e8/call  expected/disp32  # never returns
-228     # . . discard args
-229     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-230 $get-num:main:
-231     # - otherwise read a digit
-232     # . save registers
-233     50/push-eax
-234     51/push-ecx
-235     52/push-edx
-236     53/push-ebx
-237     56/push-esi
-238     57/push-edi
-239     # read necessary variables to registers
-240     # esi = in
-241     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
-242     # edi = out
-243     8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   0xc/disp8       .                 # copy *(ebp+12) to edi
-244     # ecx = out->write
-245     8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           1/r32/ecx   .               .                 # copy *edi to ecx
-246     # edx = out->size
-247     8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           2/r32/edx   8/disp8         .                 # copy *(edi+8) to edx
-248 $get-num:loop:
-249     # if (out->write >= out->size) error
-250     39/compare                      3/mod/direct    2/rm32/edx    .           .             .           1/r32/ecx   .               .                 # compare edx with ecx
-251     7d/jump-if-<  $get-num:stage2/disp8
-252     # . error(ed, err, msg)  # TODO: show full number
-253     # . . push args
-254     68/push  "get-num: too many digits in number"/imm32
-255     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x10/disp8      .                 # push *(ebp+16)
-256     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x14/disp8      .                 # push *(ebp+20)
-257     # . . call
-258     e8/call  error/disp32  # never returns
-259     # . . discard args
-260     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-261 $get-num:stage2:
-262     # out->data[out->write] = LSB(Look)
-263     8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  1/index/ecx   .           3/r32/ebx   0xc/disp8       .                 # copy edi+ecx+12 to ebx
-264     8b/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/eax   Look/disp32     .                 # copy *Look to eax
-265     88/copy-byte                    0/mod/indirect  3/rm32/ebx    .           .             .           0/r32/AL    .               .                 # copy byte at AL to *ebx
-266     # ++out->write
-267     41/increment-ecx
-268     # Look = get-char(in)
-269     # . . push args
-270     56/push-esi
-271     # . . call
-272     e8/call  get-char/disp32
-273     # . . discard args
-274     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-275 $get-num:loop-end:
-276     # persist necessary variables from registers
-277     89/copy                         0/mod/indirect  7/rm32/edi    .           .             .           1/r32/ecx   .               .                 # copy ecx to *edi
-278 $get-num:end:
-279     # . restore registers
-280     5f/pop-to-edi
-281     5e/pop-to-esi
-282     5b/pop-to-ebx
-283     5a/pop-to-edx
-284     59/pop-to-ecx
-285     58/pop-to-eax
-286     # . epilogue
-287     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-288     5d/pop-to-ebp
-289     c3/return
-290 
-291 test-get-num-reads-single-digit:
-292     # - check that get-num returns first character if it's a digit
-293     # This test uses exit-descriptors. Use ebp for setting up local variables.
-294     55/push-ebp
-295     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-296     # clear all streams
-297     # . clear-stream(_test-stream)
-298     # . . push args
-299     68/push  _test-stream/imm32
-300     # . . call
-301     e8/call  clear-stream/disp32
-302     # . . discard args
-303     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-304     # . clear-stream($_test-buffered-file->buffer)
-305     # . . push args
-306     68/push  $_test-buffered-file->buffer/imm32
-307     # . . call
-308     e8/call  clear-stream/disp32
-309     # . . discard args
-310     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-311     # . clear-stream(_test-output-stream)
-312     # . . push args
-313     68/push  _test-output-stream/imm32
-314     # . . call
-315     e8/call  clear-stream/disp32
-316     # . . discard args
-317     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-318     # . clear-stream(_test-error-stream)
-319     # . . push args
-320     68/push  _test-error-stream/imm32
-321     # . . call
-322     e8/call  clear-stream/disp32
-323     # . . discard args
-324     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-325     # initialize 'in'
-326     # . write(_test-stream, "3")
-327     # . . push args
-328     68/push  "3"/imm32
-329     68/push  _test-stream/imm32
-330     # . . call
-331     e8/call  write/disp32
-332     # . . discard args
-333     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-334     # initialize exit-descriptor 'ed' for the call to 'get-num' below
-335     # . var ed/eax: exit-descriptor
-336     81          5/subop/subtract    3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # subtract from esp
-337     89/copy                         3/mod/direct    0/rm32/eax    .           .             .           4/r32/esp   .               .                 # copy esp to eax
-338     # . tailor-exit-descriptor(ed, 16)
-339     # . . push args
-340     68/push  0x10/imm32/nbytes-of-args-for-get-num
-341     50/push-eax/ed
-342     # . . call
-343     e8/call  tailor-exit-descriptor/disp32
-344     # . . discard args
-345     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-346     # prime the pump
-347     # . get-char(_test-buffered-file)
-348     # . . push args
-349     68/push  _test-buffered-file/imm32
-350     # . . call
-351     e8/call  get-char/disp32
-352     # . . discard args
-353     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-354     # get-num(in, out, err, ed)
-355     # . . push args
-356     50/push-eax/ed
-357     68/push  _test-error-stream/imm32
-358     68/push  _test-output-stream/imm32
-359     68/push  _test-buffered-file/imm32
-360     # . . call
-361     e8/call  get-num/disp32
-362     # registers except esp may be clobbered at this point
-363     # . . discard args
-364     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
-365     # check-ints-equal(*_test-output-stream->data, '3', msg)
-366     # . . push args
-367     68/push  "F - test-get-num-reads-single-digit"/imm32
-368     68/push  0x33/imm32
-369     b8/copy-to-eax  _test-output-stream/imm32
-370     ff          6/subop/push        1/mod/*+disp8   0/rm32/eax    .           .             .           .           0xc/disp8       .                 # push *(eax+12)
-371     # . . call
-372     e8/call  check-ints-equal/disp32
-373     # . . discard args
-374     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-375     # . reclaim locals
-376     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-377     5d/pop-to-ebp
-378     c3/return
-379 
-380 test-get-num-aborts-on-non-digit-in-Look:
-381     # - check that get-num returns first character if it's a digit
-382     # This test uses exit-descriptors. Use ebp for setting up local variables.
-383     55/push-ebp
-384     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-385     # clear all streams
-386     # . clear-stream(_test-stream)
-387     # . . push args
-388     68/push  _test-stream/imm32
-389     # . . call
-390     e8/call  clear-stream/disp32
-391     # . . discard args
-392     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-393     # . clear-stream($_test-buffered-file->buffer)
-394     # . . push args
-395     68/push  $_test-buffered-file->buffer/imm32
-396     # . . call
-397     e8/call  clear-stream/disp32
-398     # . . discard args
-399     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-400     # . clear-stream(_test-output-stream)
-401     # . . push args
-402     68/push  _test-output-stream/imm32
-403     # . . call
-404     e8/call  clear-stream/disp32
-405     # . . discard args
-406     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-407     # . clear-stream(_test-error-stream)
-408     # . . push args
-409     68/push  _test-error-stream/imm32
-410     # . . call
-411     e8/call  clear-stream/disp32
-412     # . . discard args
-413     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-414     # initialize 'in'
-415     # . write(_test-stream, "3")
-416     # . . push args
-417     68/push  "3"/imm32
-418     68/push  _test-stream/imm32
-419     # . . call
-420     e8/call  write/disp32
-421     # . . discard args
-422     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-423     # initialize exit-descriptor 'ed' for the call to 'get-num' below
-424     # . var ed/eax: exit-descriptor
-425     81          5/subop/subtract    3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # subtract from esp
-426     89/copy                         3/mod/direct    0/rm32/eax    .           .             .           4/r32/esp   .               .                 # copy esp to eax
-427     # . tailor-exit-descriptor(ed, 16)
-428     # . . push args
-429     68/push  0x10/imm32/nbytes-of-args-for-get-num
-430     50/push-eax/ed
-431     # . . call
-432     e8/call  tailor-exit-descriptor/disp32
-433     # . . discard args
-434     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-435     # *don't* prime the pump
-436     # get-num(in, out, err, ed)
-437     # . . push args
-438     50/push-eax/ed
-439     68/push  _test-error-stream/imm32
-440     68/push  _test-output-stream/imm32
-441     68/push  _test-buffered-file/imm32
-442     # . . call
-443     e8/call  get-num/disp32
-444     # registers except esp may be clobbered at this point
-445     # . . discard args
-446     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
-447     # check that get-num tried to call exit(1)
-448     # . check-ints-equal(ed->value, 2, msg)  # i.e. stop was called with value 1
-449     # . . push args
-450     68/push  "F - test-get-num-aborts-on-non-digit-in-Look"/imm32
-451     68/push  2/imm32
-452     # . . push ed->value
-453     ff          6/subop/push        1/mod/*+disp8   0/rm32/eax    .           .             .           .           4/disp8         .                 # push *(eax+4)
-454     # . . call
-455     e8/call  check-ints-equal/disp32
-456     # . . discard args
-457     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-458     # . reclaim locals
-459     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-460     5d/pop-to-ebp
-461     c3/return
-462 
-463 ## helpers
-464 
-465 # write(f, "Error: "+s+" expected\n") then stop(ed, 1)
-466 expected:  # ed: (addr exit-descriptor), f: fd or (addr stream byte), s: (addr array byte)
-467     # . prologue
-468     55/push-ebp
-469     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-470     # write(f, "Error: ")
-471     # . . push args
-472     68/push  "Error: "/imm32
-473     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-474     # . . call
-475     e8/call  write/disp32
-476     # . . discard args
-477     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-478     # write(f, s)
-479     # . . push args
-480     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0x10/disp8      .                 # push *(ebp+16)
-481     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-482     # . . call
-483     e8/call  write/disp32
-484     # . . discard args
-485     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-486     # write(f, " expected\n")
-487     # . . push args
-488     68/push  " expected\n"/imm32
-489     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-490     # . . call
-491     e8/call  write/disp32
-492     # . . discard args
-493     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-494     # stop(ed, 1)
-495     # . . push args
-496     68/push  1/imm32
-497     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
-498     # . . call
-499     e8/call  stop/disp32
-500     # should never get past this point
-501 $expected:dead-end:
-502     # . epilogue
-503     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-504     5d/pop-to-ebp
-505     c3/return
-506 
-507 # read a byte from 'f', and save it in 'Look'
-508 get-char:  # f: (addr buffered-file)
-509     # . prologue
-510     55/push-ebp
-511     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-512     # . save registers
-513     50/push-eax
-514     # eax = read-byte-buffered(f)
-515     # . . push args
-516     ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
-517     # . . call
-518     e8/call  read-byte-buffered/disp32
-519     # . . discard args
-520     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-521     # save eax to Look
-522     89/copy                         0/mod/indirect  5/rm32/.disp32            .             .           0/r32/eax   Look/disp32     .                 # copy eax to *Look
-523 $get-char:end:
-524     # . restore registers
-525     58/pop-to-eax
-526     # . epilogue
-527     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-528     5d/pop-to-ebp
-529     c3/return
-530 
-531 is-digit?:  # c: int -> eax: boolean
-532     # . prologue
-533     55/push-ebp
-534     89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-535     # eax = false
-536     b8/copy-to-eax  0/imm32
-537     # if (c < '0') return false
-538     81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         0x30/imm32        # compare *(ebp+8)
-539     7c/jump-if-<  $is-digit?:end/disp8
-540     # if (c > '9') return false
-541     81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         0x39/imm32        # compare *(ebp+8)
-542     7f/jump-if->  $is-digit?:end/disp8
-543     # otherwise return true
-544     b8/copy-to-eax  1/imm32
-545 $is-digit?:end:
-546     # . epilogue
-547     89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-548     5d/pop-to-ebp
-549     c3/return
-550 
-551 == data
-552 
-553 Look:  # (char with some extra padding)
-554     0/imm32
-555 
-556 # . . vim:nowrap:textwidth=0
-
- - - -- cgit 1.4.1-2-gfad0