301array-equal.subx


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115fn draw-circle screen: (addr screen), cx: int, cy: int, radius: int, color: int {
  var x: int
  var y: int
  var err: int
  # x = -r
  var tmp/eax: int <- copy radius
  tmp <- negate
  copy-to x, tmp
  # err = 2 - 2*r
  tmp <- copy radius
  tmp <- shift-left 1
  tmp <- negate
  tmp <- add 2
  copy-to err, tmp
  #
  var tmpx/ecx: int <- copy 0
  var tmpy/edx: int <- copy 0
  {
    # pixel(cx-x, cy+y)
    tmpx <- copy cx
    tmpx pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */# Comparing arrays of numbers.

== code

array-equal?:  # a: (addr array int), b: (addr array int) -> result/eax: boolean
    # pseudocode:
    #   asize = a->size
    #   if (asize != b->size) return false
    #   i = 0
    #   curra = a->data
    #   currb = b->data
    #   while i < asize
    #     i1 = *curra
    #     i2 = *currb
    #     if (c1 != c2) return false
    #     i+=4, curra+=4, currb+=4
    #   return true
    #
    # registers:
    #   i: ecx
    #   asize: edx
    #   curra: esi
    #   currb: edi
    #   i1: eax
    #   i2: ebx
    #
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # esi = a
    8b/-> *(ebp+8) 6/r32/esi
    # edi = b
    8b/-> *(ebp+0xc) 7/r32/edi
    # var asize/edx: int = a->size
    8b/-> *esi 2/r32/edx
$array-equal?:sizes:
    # if (asize != b->size) return false
    39/compare *edi 2/r32/edx
    75/jump-if-!= $array-equal?:false/disp8
    # var curra/esi: (addr byte) = a->data
    81 0/subop/add %esi 4/imm32
    # var currb/edi: (addr byte) = b->data
    81 0/subop/add %edi 4/imm32
    # var i/ecx: int = 0
    31/xor-with %ecx 1/r32/ecx
    # var vala/eax: int
    # var valb/ebx: int
$array-equal?:loop:
    # if (i >= asize) return true
    39/compare %ecx 2/r32/edx
    7d/jump-if->= $array-equal?:true/disp8
    # var vala/eax: int = *curra
    8b/-> *esi 0/r32/eax
    # var valb/ebx: int = *currb
    8b/-> *edi 3/r32/ebx
    # if (vala != valb) return false
    39/compare %eax 3/r32/ebx
    75/jump-if-!= $array-equal?:false/disp8
    # i += 4
    81 0/subop/add %ecx 4/imm32
    # currs += 4
    81 0/subop/add %esi 4/imm32
    # currb += 4
    81 0/subop/add %edi 4/imm32
    eb/jump $array-equal?:loop/disp8
$array-equal?:true:
    b8/copy-to-eax 1/imm32
    eb/jump $array-equal?:end/disp8
$array-equal?:false:
    b8/copy-to-eax 0/imm32
$array-equal?:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-compare-empty-with-empty-array:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var ecx: (array _) = []
    68/push 0/imm32/size
    89/<- %ecx 4/r32/esp
    # var edx: (array _) = []
    68/push 0/imm32/size
    89/<- %edx 4/r32/esp
    #
    (array-equal? %ecx %edx)  # => eax
    (check-ints-equal %eax 1 "F - test-compare-empty-with-empty-array")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-compare-empty-with-non-empty-array:  # also checks size-mismatch code path
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var ecx: (array int) = [1]
    68/push 1/imm32
    68/push 4/imm32/size
    89/<- %ecx 4/r32/esp
    # var edx: (array int) = []
    68/push 0/imm32/size
    89/<- %edx 4/r32/esp
    #
    (array-equal? %ecx %edx)  # => eax
    (check-ints-equal %eax 0 "F - test-compare-empty-with-non-empty-array")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-compare-equal-arrays:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var ecx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %ecx 4/r32/esp
    # var edx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %edx 4/r32/esp
    #
    (array-equal? %ecx %edx)  # => eax
    (check-ints-equal %eax 1 "F - test-compare-equal-arrays")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-compare-inequal-arrays-equal-sizes:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var ecx: (array int) = [1, 4, 3]
    68/push 3/imm32
    68/push 4/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %ecx 4/r32/esp
    # var edx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %edx 4/r32/esp
    #
    (array-equal? %ecx %edx)  # => eax
    (check-ints-equal %eax 0 "F - test-compare-inequal-arrays-equal-sizes")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

_parse-array-of-ints:  # ad: (addr allocation-descriptor), s: (addr array byte), out: (addr handle array int)
    # pseudocode
    #   end = &s->data[s->size]
    #   curr = s->data
    #   size = 0
    #   while true
    #     if (curr >= end) break
    #     curr = skip-chars-matching-in-slice(curr, end, ' ')
    #     if (curr >= end) break
    #     curr = skip-chars-not-matching-in-slice(curr, end, ' ')
    #     ++size
    #   allocate-array(ad, size*4, out)
    #   var slice: slice = {s->data, 0}
    #   curr = lookup(out)->data
    #   while true
    #     if (slice->start >= end) break
    #     slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
    #     if (slice->start >= end) break
    #     slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
    #     *curr = parse-hex-int-from-slice(slice)
    #     curr += 4
    #     slice->start = slice->end
    #   return result
    #
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # esi = s
    8b/-> *(ebp+0xc) 6/r32/esi
    # var curr/ecx: (addr byte) = s->data
    8d/copy-address *(esi+4) 1/r32/ecx
    # var end/edx: (addr byte) = &s->data[s->size]
    # . edx = s->size
    8b/-> *esi 2/r32/edx
    # . edx += curr
    01/add-to %edx 1/r32/ecx
    # var size/ebx: int = 0
    31/xor-with %ebx 3/r32/ebx
$_parse-array-of-ints:loop1:
    # if (curr >= end) break
    39/compare %ecx 2/r32/edx
    73/jump-if-addr>= $_parse-array-of-ints:break1/disp8
    # curr = skip-chars-matching-in-slice(curr, end, ' ')
    (skip-chars-matching-in-slice %ecx %edx 0x20)  # => eax
    89/<- %ecx 0/r32/eax
    # if (curr >= end) break
    39/compare %ecx 2/r32/edx
    73/jump-if-addr>= $_parse-array-of-ints:break1/disp8
    # curr = skip-chars-not-matching-in-slice(curr, end, ' ')
    (skip-chars-not-matching-in-slice %ecx %edx 0x20)  # => eax
    89/<- %ecx 0/r32/eax
    # size += 4
    81 0/subop/add %ebx 4/imm32
    eb/jump $_parse-array-of-ints:loop1/disp8
$_parse-array-of-ints:break1:
    (allocate-array *(ebp+8) %ebx *(ebp+0x10))
$_parse-array-of-ints:pass2:
    # var slice/edi: slice = {s->data, 0}
    68/push 0/imm32/end
    8d/copy-address *(esi+4) 7/r32/edi
    57/push-edi
    89/<- %edi 4/r32/esp
    # curr = lookup(out)->data
    8b/-> *(ebp+0x10) 0/r32/eax
    (lookup *eax *(eax+4))  # => eax
    8d/copy-address *(eax+4) 1/r32/ecx
$_parse-array-of-ints:loop2:
    # if (slice->start >= end) break
    39/compare *edi 2/r32/edx
    73/jump-if-addr>= $_parse-array-of-ints:end/disp8
    # slice->start = skip-chars-matching-in-slice(slice->start, end, ' ')
    (skip-chars-matching-in-slice *edi %edx 0x20)  # => eax
    89/<- *edi 0/r32/eax
    # if (slice->start >= end) break
    39/compare *edi 2/r32/edx
    73/jump-if-addr>= $_parse-array-of-ints:end/disp8
    # slice->end = skip-chars-not-matching-in-slice(slice->start, end, ' ')
    (skip-chars-not-matching-in-slice *edi %edx 0x20)  # => eax
    89/<- *(edi+4) 0/r32/eax
    # *curr = parse-hex-int-from-slice(slice)
    (parse-hex-int-from-slice %edi)
    89/<- *ecx 0/r32/eax
    # curr += 4
    81 0/subop/add %ecx 4/imm32
    # slice->start = slice->end
    8b/-> *(edi+4) 0/r32/eax
    89/<- *edi 0/r32/eax
    eb/jump $_parse-array-of-ints:loop2/disp8
$_parse-array-of-ints:end:
    # . reclaim locals
    81 0/subop/add %esp 8/imm32
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-parse-array-of-ints:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var h/esi: (handle array int)
    68/push 0/imm32
    68/push 0/imm32
    89/<- %esi 4/r32/esp
    # var ecx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %ecx 4/r32/esp
    #
    (_parse-array-of-ints Heap "1 2 3" %esi)
    (lookup *esi *(esi+4))  # => eax
    (array-equal? %ecx %eax)  # => eax
    (check-ints-equal %eax 1 "F - test-parse-array-of-ints")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-parse-array-of-ints-empty:
    # - empty string = empty array
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var h/esi: handle
    68/push 0/imm32
    68/push 0/imm32
    89/<- %esi 4/r32/esp
    #
    (_parse-array-of-ints Heap "" %esi)
    (lookup *esi *(esi+4))  # => eax
    (check-ints-equal *eax 0 "F - test-parse-array-of-ints-empty")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-parse-array-of-ints-just-whitespace:
    # - just whitespace = empty array
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var h/esi: handle
    68/push 0/imm32
    68/push 0/imm32
    89/<- %esi 4/r32/esp
    #
    (_parse-array-of-ints Heap Space %esi)
    (lookup *esi *(esi+4))  # => eax
    (check-ints-equal *eax 0 "F - test-parse-array-of-ints-just-whitespace")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-parse-array-of-ints-extra-whitespace:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var h/esi: handle
    68/push 0/imm32
    68/push 0/imm32
    89/<- %esi 4/r32/esp
    # var ecx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %ecx 4/r32/esp
    #
    (_parse-array-of-ints Heap " 1 2  3  " %esi)
    (lookup *esi *(esi+4))  # => eax
    (array-equal? %ecx %eax)  # => eax
    (check-ints-equal %eax 1 "F - test-parse-array-of-ints-extra-whitespace")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

parse-array-of-ints:  # s: (addr array byte), out: (addr handle array int)
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    #
    (_parse-array-of-ints Heap *(ebp+8) *(ebp+0xc))
$parse-array-of-ints:end:
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

# helper for later tests
# compare an array with a string representation of an array literal
check-array-equal:  # a: (addr array int), expected: (addr string), msg: (addr string)
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # . save registers
    50/push-eax
    56/push-esi
    # var h/esi: handle
    68/push 0/imm32
    68/push 0/imm32
    89/<- %esi 4/r32/esp
    # var b/eax: (addr array int) = parse-array-of-ints(Heap, expected)
    (parse-array-of-ints *(ebp+0xc) %esi)
    (lookup *esi *(esi+4))  # => eax
    #
    (array-equal? *(ebp+8) %eax)
    (check-ints-equal %eax 1 *(ebp+0x10))
$check-array-equal:end:
    # . restore registers
    5e/pop-to-esi
    58/pop-to-eax
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

test-check-array-equal:
    # . prologue
    55/push-ebp
    89/<- %ebp 4/r32/esp
    # var ecx: (array int) = [1, 2, 3]
    68/push 3/imm32
    68/push 2/imm32
    68/push 1/imm32
    68/push 0xc/imm32/size
    89/<- %ecx 4/r32/esp
    #
    (check-array-equal %ecx "1 2 3" "F - test-check-array-equal")
    # . epilogue
    89/<- %esp 5/r32/ebp
    5d/pop-to-ebp
    c3/return

== data

# length-prefixed string containing just a single space
Space:  # (array byte)
    # size: int
    1/imm32
    # data
    20/space