5675 - move helpers from subx-common into layers

This undoes 5672 in favor of a new plan:

Layers 000 - 099 are for running without syntax sugar. We use them for
building syntax-sugar passes.

Layers 100 and up are for running with all syntax sugar.

The layers are arranged in approximate order so more phases rely on earlier
layers than later ones.

I plan to not use intermediate syntax sugar (just sigils without calls,
or sigils and calls without braces) anywhere except in the specific passes
implementing them.

1 files changed, 238 insertions, 0 deletions

diff --git a/083subx-widths.subx b/083subx-widths.subx
new file mode 100644
index 00000000..18fe9833
--- /dev/null
+++ b/083subx-widths.subx
@@ -0,0 +1,238 @@
+== 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
+
+compute-width: # word : (address array byte) -> eax : int
+    # . prolog
+    55/push-ebp
+    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+    # . save registers
+    51/push-ecx
+    # eax = word
+    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           0/r32/eax   8/disp8         .                 # copy *(ebp+8) to ecx
+    # ecx = word + word->length
+    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
+    # eax = word->data
+    05/add-to-eax  4/imm32
+    # var in/ecx : (address slice) = {eax, ecx}
+    51/push-ecx
+    50/push-eax
+    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
+    # return compute-width-of-slice(ecx)
+    # . . push args
+    51/push-ecx
+    # . . call
+    e8/call  compute-width-of-slice/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+$compute-width:end:
+    # . reclaim locals
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . restore registers
+    59/pop-to-ecx
+    # . epilog
+    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
+    5d/pop-to-ebp
+    c3/return
+
+compute-width-of-slice: # s : (address slice) -> eax : int
+    # . prolog
+    55/push-ebp
+    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+    # . save registers
+    51/push-ecx
+    # ecx = s
+    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   8/disp8         .                 # copy *(ebp+8) to ecx
+    # if (has-metadata?(word, "imm32")) return 4
+    # . eax = has-metadata?(word, "imm32")
+    # . . push args
+    68/push  "imm32"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  has-metadata?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != 0) return 4
+    3d/compare-eax-and  0/imm32
+    b8/copy-to-eax  4/imm32         # ZF is set, so we can overwrite eax now
+    75/jump-if-not-equal  $compute-width-of-slice:end/disp8
+    # if (has-metadata?(word, "disp32")) return 4
+    # . eax = has-metadata?(word, "disp32")
+    # . . push args
+    68/push  "disp32"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  has-metadata?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != 0) return 4
+    3d/compare-eax-and  0/imm32
+    b8/copy-to-eax  4/imm32         # ZF is set, so we can overwrite eax now
+    75/jump-if-not-equal  $compute-width-of-slice:end/disp8
+    # if (has-metadata?(word, "imm16")) return 2
+    # . eax = has-metadata?(word, "imm16")
+    # . . push args
+    68/push  "imm16"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  has-metadata?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != 0) return 2
+    3d/compare-eax-and  0/imm32
+    b8/copy-to-eax  2/imm32         # ZF is set, so we can overwrite eax now
+    75/jump-if-not-equal  $compute-width-of-slice:end/disp8
+    # if (has-metadata?(word, "disp16")) return 2
+    # . eax = has-metadata?(word, "disp16")
+    # . . push args
+    68/push  "disp16"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  has-metadata?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != 0) return 2
+    3d/compare-eax-and  0/imm32
+    b8/copy-to-eax  2/imm32         # ZF is set, so we can overwrite eax now
+    75/jump-if-not-equal  $compute-width-of-slice:end/disp8
+    # otherwise return 1
+    b8/copy-to-eax  1/imm32
+$compute-width-of-slice:end:
+    # . restore registers
+    59/pop-to-ecx
+    # . epilog
+    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
+    5d/pop-to-ebp
+    c3/return
+
+test-compute-width:
+    # . prolog
+    55/push-ebp
+    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
+$test-compute-width:imm8:
+    # eax = compute-width("0x2/imm8")
+    # . . push args
+    68/push  "0x2/imm8"/imm32
+    # . . call
+    e8/call  compute-width/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+    # check-ints-equal(eax, 1, msg)
+    # . . push args
+    68/push  "F - test-compute-width: 0x2/imm8"/imm32
+    50/push-eax
+    68/push  1/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+$test-compute-width:imm16:
+    # eax = compute-width("4/imm16")
+    # . . push args
+    68/push  "4/imm16"/imm32
+    # . . call
+    e8/call  compute-width/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+    # check-ints-equal(eax, 2, msg)
+    # . . push args
+    68/push  "F - test-compute-width: 4/imm16"/imm32
+    50/push-eax
+    68/push  2/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+$test-compute-width:imm32:
+    # eax = compute-width("4/imm32")
+    # . . push args
+    68/push  "4/imm32"/imm32
+    # . . call
+    e8/call  compute-width/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+    # check-ints-equal(eax, 4, msg)
+    # . . push args
+    68/push  "F - test-compute-width: 4/imm32"/imm32
+    50/push-eax
+    68/push  4/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+$test-compute-width:disp8:
+    # eax = compute-width("foo/disp8")
+    # . . push args
+    68/push  "foo/disp8"/imm32
+    # . . call
+    e8/call  compute-width/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-compute-width: foo/disp8"/imm32
+    50/push-eax
+    68/push  1/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+$test-compute-width:disp16:
+    # eax = compute-width("foo/disp16")
+    # . . push args
+    68/push  "foo/disp16"/imm32
+    # . . call
+    e8/call  compute-width/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+    # check-ints-equal(eax, 2, msg)
+    # . . push args
+    68/push  "F - test-compute-width: foo/disp16"/imm32
+    50/push-eax
+    68/push  2/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+$test-compute-width:disp32:
+    # eax = compute-width("foo/disp32")
+    # . . push args
+    68/push  "foo/disp32"/imm32
+    # . . call
+    e8/call  compute-width/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
+    # check-ints-equal(eax, 4, msg)
+    # . . push args
+    68/push  "F - test-compute-width: foo/disp32"/imm32
+    50/push-eax
+    68/push  4/imm32
+    # . . 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-compute-width:no-metadata:
+    # eax = compute-width("45")
+    # . . push args
+    68/push  "45"/imm32
+    # . . call
+    e8/call  compute-width/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-compute-width: 45 (no metadata)"/imm32
+    50/push-eax
+    68/push  1/imm32
+    # . . call
+    e8/call  check-ints-equal/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
+    # . epilog
+    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