7842 - new directory organization

Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.

So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.

A couple of things have gotten dropped in this process:
  - I had old ways to run on just a Linux kernel, or with a Soso kernel.
    No more.
  - I had some old tooling for running a single test at the cursor. I haven't
    used that lately. Maybe I'll bring it back one day.

The reorg isn't done yet. Still to do:
  - redo documentation everywhere. All the README files, all other markdown,
    particularly vocabulary.md.
  - clean up how-to-run comments at the start of programs everywhere
  - rethink what to do with the html/ directory. Do we even want to keep
    supporting it?

In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.

1 files changed, 0 insertions, 623 deletions

diff --git a/128subx-words.subx b/128subx-words.subx
deleted file mode 100644
index c3da70f0..00000000
--- a/128subx-words.subx
+++ /dev/null
@@ -1,623 +0,0 @@
-# Helpers for parsing SubX words, with their rules for hex, labels and metadata.
-
-== code
-#   instruction                     effective address                                                   register    displacement    immediate
-# . op          subop               mod             rm32          base        index         scale       r32
-# . 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
-
-has-metadata?:  # word: (addr slice), s: (addr string) -> result/eax: boolean
-    # pseudocode:
-    #   var twig: &slice = next-token-from-slice(word->start, word->end, '/')  # skip name
-    #   curr = twig->end
-    #   while true
-    #     twig = next-token-from-slice(curr, word->end, '/')
-    #     if (twig.empty()) break
-    #     if (slice-equal?(twig, s)) return true
-    #     curr = twig->end
-    #   return false
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # . save registers
-    51/push-ecx
-    52/push-edx
-    56/push-esi
-    57/push-edi
-    # esi = word
-    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
-    # var edx: (addr byte) = word->end
-    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           2/r32/edx   4/disp8         .                 # copy *(esi+4) to edx
-    # var twig/edi: slice
-    68/push  0/imm32/end
-    68/push  0/imm32/start
-    89/copy                         3/mod/direct    7/rm32/edi    .           .             .           4/r32/esp   .               .                 # copy esp to edi
-    # next-token-from-slice(word->start, word->end, '/', twig)
-    # . . push args
-    57/push-edi
-    68/push  0x2f/imm32/slash
-    52/push-edx
-    ff          6/subop/push        0/mod/indirect  6/rm32/esi    .           .             .           .           .               .                 # push *esi
-    # . . call
-    e8/call  next-token-from-slice/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
-$has-metadata?:loop:
-    # next-token-from-slice(curr, word->end, '/', twig)
-    # . . push args
-    57/push-edi
-    68/push  0x2f/imm32/slash
-    52/push-edx
-    ff          6/subop/push        1/mod/*+disp8   7/rm32/edi    .           .             .           .           4/disp8         .                 # push *(edi+4)
-    # . . call
-    e8/call  next-token-from-slice/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
-    # if (slice-empty?(twig)) return false
-    # . eax = slice-empty?(twig)
-    # . . push args
-    57/push-edi
-    # . . call
-    e8/call  slice-empty?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # . if (eax != false) return false
-    3d/compare-eax-and  0/imm32/false
-    75/jump-if-!=  $has-metadata?:false/disp8
-    # if (slice-equal?(twig, s)) return true
-    # . eax = slice-equal?(twig, s)
-    # . . push args
-    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
-    57/push-edi
-    # . . call
-    e8/call  slice-equal?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # . if (eax != false) return true
-    3d/compare-eax-and  0/imm32/false
-    # eax already contains true
-    75/jump-if-!=  $has-metadata?:end/disp8
-    eb/jump  $has-metadata?:loop/disp8
-$has-metadata?:false:
-    b8/copy-to-eax  0/imm32/false
-$has-metadata?:end:
-    # . reclaim locals
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # . restore registers
-    5f/pop-to-edi
-    5e/pop-to-esi
-    5a/pop-to-edx
-    59/pop-to-ecx
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-has-metadata-true:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "ab/imm32"
-    b8/copy-to-eax  "ab/imm32"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var in/esi: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    6/rm32/esi    .           .             .           4/r32/esp   .               .                 # copy esp to esi
-    # eax = has-metadata?(esi, "imm32")
-    # . . push args
-    68/push  "imm32"/imm32
-    56/push-esi
-    # . . call
-    e8/call  has-metadata?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-ints-equal(eax, 1, msg)
-    # . . push args
-    68/push  "F - test-has-metadata-true"/imm32
-    68/push  1/imm32/true
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-has-metadata-false:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "ab/c"
-    b8/copy-to-eax  "ab/c"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var in/esi: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    6/rm32/esi    .           .             .           4/r32/esp   .               .                 # copy esp to esi
-    # eax = has-metadata?(esi, "d")
-    # . . push args
-    68/push  "d"/imm32
-    56/push-esi
-    # . . call
-    e8/call  has-metadata?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-has-metadata-false"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-has-metadata-ignore-name:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "a/b"
-    b8/copy-to-eax  "a/b"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var in/esi: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    6/rm32/esi    .           .             .           4/r32/esp   .               .                 # copy esp to esi
-    # eax = has-metadata?(esi, "a")
-    # . . push args
-    68/push  "a"/imm32
-    56/push-esi
-    # . . call
-    e8/call  has-metadata?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-has-metadata-ignore-name"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-has-metadata-multiple-true:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "a/b/c"
-    b8/copy-to-eax  "a/b/c"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var in/esi: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    6/rm32/esi    .           .             .           4/r32/esp   .               .                 # copy esp to esi
-    # eax = has-metadata?(esi, "c")
-    # . . push args
-    68/push  "c"/imm32
-    56/push-esi
-    # . . call
-    e8/call  has-metadata?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-ints-equal(eax, 1, msg)
-    # . . push args
-    68/push  "F - test-has-metadata-multiple-true"/imm32
-    68/push  1/imm32/true
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-has-metadata-multiple-false:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "a/b/c"
-    b8/copy-to-eax  "a/b/c"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var in/esi: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    6/rm32/esi    .           .             .           4/r32/esp   .               .                 # copy esp to esi
-    # eax = has-metadata?(esi, "d")
-    # . . push args
-    68/push  "d"/imm32
-    56/push-esi
-    # . . call
-    e8/call  has-metadata?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-has-metadata-multiple-false"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-# conditions for 'valid' names that are not at risk of looking like hex numbers
-# keep in sync with the rules in labels.cc
-#: - if it starts with a digit, it's treated as a number. If it can't be
-#:   parsed as hex it will raise an error.
-#: - if it starts with '-' it's treated as a number.
-#: - if it starts with '0x' it's treated as a number. (redundant)
-#: - if it's two characters long, it can't be a name. Either it's a hex
-#:   byte, or it raises an error.
-is-valid-name?:  # in: (addr slice) -> result/eax: boolean
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # . save registers
-    51/push-ecx
-    56/push-esi
-    # esi = in
-    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
-    # var start/ecx: (addr byte) = in->start
-    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # copy *esi to ecx
-$is-valid-name?:check0:
-    # if (start >= in->end) return false
-    3b/compare                      1/mod/*+disp8   6/rm32/esi    .           .             .           1/r32/ecx   4/disp8         .                 # compare ecx with *(esi+4)
-    73/jump-if-addr>=  $is-valid-name?:false/disp8
-$is-valid-name?:check1:
-    # var len/eax: int = in->end - start
-    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy *(esi+4) to eax
-    29/subtract                     3/mod/direct    0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # subtract ecx from eax
-    # if (eax == 2) return false
-    3d/compare-eax-and  2/imm32
-    74/jump-if-=  $is-valid-name?:false/disp8
-$is-valid-name?:check2:
-    # var c/eax: (addr byte) = *start
-    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
-    8a/copy-byte                    0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/AL    .               .                 # copy byte at *ecx to AL
-    # if (c == "-") return false
-    3d/compare-eax-and  2d/imm32/-
-    74/jump-if-=  $is-valid-name?:false/disp8
-$is-valid-name?:check3a:
-    # if (c < "0") return true
-    3d/compare-eax-with  30/imm32/0
-    7c/jump-if-<  $is-valid-name?:true/disp8
-$is-valid-name?:check3b:
-    # if (c > "9") return true
-    3d/compare-eax-with  39/imm32/9
-    7f/jump-if->  $is-valid-name?:true/disp8
-$is-valid-name?:false:
-    # return false
-    b8/copy-to-eax  0/imm32/false
-    eb/jump  $is-valid-name?:end/disp8
-$is-valid-name?:true:
-    # return true
-    b8/copy-to-eax  1/imm32/true
-$is-valid-name?:end:
-    # . restore registers
-    5e/pop-to-esi
-    59/pop-to-ecx
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-digit-prefix:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "34"
-    b8/copy-to-eax  "34"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-digit-prefix"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-negative-prefix:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "-0x34"
-    b8/copy-to-eax  "-0x34"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-negative-prefix"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-0x-prefix:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "0x34"
-    b8/copy-to-eax  "0x34"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-0x-prefix"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-starts-with-pre-digit:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "/03"
-    b8/copy-to-eax  "/03"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 1, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-starts-with-pre-digit"/imm32
-    68/push  1/imm32/true
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-starts-with-post-digit:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "q34"
-    b8/copy-to-eax  "q34"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 1, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-starts-with-post-digit"/imm32
-    68/push  1/imm32/true
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-valid-name-starts-with-digit:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # (eax..ecx) = "0x34"
-    b8/copy-to-eax  "0x34"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # eax = is-valid-name?(slice)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-valid-name?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-is-valid-name-starts-with-digit"/imm32
-    68/push  0/imm32/false
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-is-label?:  # word: (addr slice) -> result/eax: boolean
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-    # . save registers
-    51/push-ecx
-    # ecx = word
-    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   8/disp8         .                 # copy *(ebp+8) to ecx
-    # var end/ecx: (addr byte) = word->end
-    8b/copy                         1/mod/*+disp8   1/rm32/ecx    .           .             .           1/r32/ecx   4/disp8         .                 # copy *(ecx+4) to ecx
-    # return *(end - 1) == ':'
-    # . eax = *(end-1)
-    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
-    8a/copy-byte                    1/mod/*+disp8   1/rm32/ecx    .           .             .           0/r32/AL    -1/disp8         .                 # copy byte at *(ecx-1) to AL
-    # . return (eax == ':')
-    3d/compare-eax-and  0x3a/imm32/colon
-    b8/copy-to-eax  1/imm32/true
-    74/jump-if-=  $is-label?:end/disp8
-    b8/copy-to-eax  0/imm32/false
-$is-label?:end:
-    # . restore registers
-    59/pop-to-ecx
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-test-is-label?:
-    # . prologue
-    55/push-ebp
-    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
-$test-is-label?:true:
-    # (eax..ecx) = "AAA:"
-    b8/copy-to-eax  "AAA:"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # is-label?(slice/ecx)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-label?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 1, msg)
-    # . . push args
-    68/push  "F - test-is-label?:true"/imm32
-    68/push  1/imm32
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-$test-is-label?:false:
-    # (eax..ecx) = "AAA"
-    b8/copy-to-eax  "AAA"/imm32
-    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
-    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
-    05/add-to-eax  4/imm32
-    # var slice/ecx: slice = {eax, ecx}
-    51/push-ecx
-    50/push-eax
-    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
-    # is-label?(slice/ecx)
-    # . . push args
-    51/push-ecx
-    # . . call
-    e8/call  is-label?/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
-    # check-ints-equal(eax, 0, msg)
-    # . . push args
-    68/push  "F - test-is-label?:false"/imm32
-    68/push  0/imm32
-    50/push-eax
-    # . . call
-    e8/call  check-ints-equal/disp32
-    # . . discard args
-    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
-    # . epilogue
-    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
-    5d/pop-to-ebp
-    c3/return
-
-# . . vim:nowrap:textwidth=0