# some utilities for converting numbers from hex # lowercase letters only for now == 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 is-hex-int?: # 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 52/push-edx 53/push-ebx # ecx = s 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx # edx = s->end 8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 2/r32/edx 4/disp8 . # copy *(ecx+4) to edx # var curr/ecx: (addr byte) = s->start 8b/copy 0/mod/indirect 1/rm32/ecx . . . 1/r32/ecx . . # copy *ecx to ecx # if s is empty return false b8/copy-to-eax 0/imm32/false 39/compare 3/mod/direct 1/rm32/ecx . . . 2/r32/edx . . # compare ecx with edx 73/jump-if-addr>= $is-hex-int?:end/disp8 # skip past leading '-' # . if (*curr == '-') ++curr 31/xor 3/mod/direct 3/rm32/ebx . . . 3/r32/ebx . . # clear ebx 8a/copy-byte 0/mod/indirect 1/rm32/ecx . . . 3/r32/BL . . # copy byte at *ecx to BL 81 7/subop/compare 3/mod/direct 3/rm32/ebx . . . . . 0x2d/imm32/- # compare ebx 75/jump-if-!= $is-hex-int?:initial-0/disp8 # . ++curr 41/increment-ecx # skip past leading '0x' $is-hex-int?:initial-0: # . if (*curr != '0') jump to loop 31/xor 3/mod/direct 3/rm32/ebx . . . 3/r32/ebx . . # clear ebx 8a/copy-byte 0/mod/indirect 1/rm32/ecx . . . 3/r32/BL . . # copy byte at *ecx to BL 81 7/subop/compare 3/mod/direct 3/rm32/ebx . . . . . 0x30/imm32/0 # compare ebx 75/jump-if-!= $is-hex-int?:loop/disp8 # . ++curr 41/increment-ecx $is-hex-int?:initial-0x: # . if (curr >= in->end) return true 39/compare 3/mod/direct 1/rm32/ecx . . . 2/r32/edx . . # compare ecx with edx 73/jump-if-addr>= $is-hex-int?:true/disp8 # . if (*curr != 'x') jump to loop # the previous '0' is still valid so doesn't need to be checked again 31/xor 3/mod/direct 3/rm32/ebx . . . 3/r32/ebx . . # clear ebx 8a/copy-byte 0/mod/indirect 1/rm32/ecx . . . 3/r32/BL . . # copy byte at *ecx to BL 81 7/subop/compare 3/mod/direct 3/rm32/ebx . . . . . 0x78/imm32/x # compare ebx 75/jump-if-!= $is-hex-int?:loop/disp8 # . ++curr 41/increment-ecx $is-hex-int?:loop: # if (curr >= in->end) return true 39/compare 3/mod/direct 1/rm32/ecx . . . 2/r32/edx . . # compare ecx with edx 73/jump-if-addr>= $is-hex-int?:true/disp8 # var eax: boolean = is-hex-digit?(*curr) # . . push args 8a/copy-byte 0/mod/indirect 1/rm32/ecx . . . 0/r32/AL . . # copy byte at *ecx to AL 50/push-eax # . . call e8/call is-hex-digit?/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 74/jump-if-= $is-hex-int?:end/disp8 # ++curr 41/increment-ecx # loop eb/jump $is-hex-int?:loop/disp8 $is-hex-int?:true: # return true b8/copy-to-eax 1/imm32/true $is-hex-int?:end: # . restore registers 5b/pop-to-ebx 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-is-hex-int: # . 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-hex-int?(slice) # . . push args 51/push-ecx # . . call e8/call is-hex-int?/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-hex-int"/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 
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<span id="L1" class="LineNr"> 1 </span><span class="Comment"># To check our support for screens in scenarios, rewrite tests from print.mu</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="muScenario">scenario</span> print-character-at-top-left-2 [
<span id="L4" class="LineNr"> 4 </span>  <span class="Constant">local-scope</span>
<span id="L5" class="LineNr"> 5 </span>  assume-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
<span id="L6" class="LineNr"> 6 </span>  run [
<span id="L7" class="LineNr"> 7 </span>  <span class="Conceal">¦</span> a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
<span id="L8" class="LineNr"> 8 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L16'>screen</a>, a
<span id="L9" class="LineNr"> 9 </span>  ]
<span id="L10" class="LineNr">10 </span>  screen-should-contain [
<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span><span class="Constant"> .a  .</span>
<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span><span class="Constant"> .   .</span>
<span id="L13" class="LineNr">13 </span>  ]
<span id="L14" class="LineNr">14 </span>]
<span id="L15" class="LineNr">15 </span>
<span id="L16" class="LineNr">16 </span><span class="muScenario">scenario</span> clear-line-erases-printed-characters-2 [
<span id="L17" class="LineNr">17 </span>  <span class="Constant">local-scope</span>
<span id="L18" class="LineNr">18 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">3/height</span>
<span id="L19" class="LineNr">19 </span>  <span class="Comment"># print a character</span>
<span id="L20" class="LineNr">20 </span>  a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
<span id="L21" class="LineNr">21 </span>  <a href='081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L16'>screen</a>, a
<span id="L22" class="LineNr">22 </span>  <span class="Comment"># move cursor to start of line</span>
<span id="L23" class="LineNr">23 </span>  <a href='081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L591'>move-cursor</a> <a href='081print.mu.html#L16'>screen</a>, <span class="Constant">0/row</span>, <span class="Constant">0/column</span>
<span id="L24" class="LineNr">24 </span>  run [
<span id="L25" class="LineNr">25 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L524'>clear-line</a> <a href='081print.mu.html#L16'>screen</a>
<span id="L26" class="LineNr">26 </span>  ]
<span id="L27" class="LineNr">27 </span>  screen-should-contain [
<span id="L28" class="LineNr">28 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L29" class="LineNr">29 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L30" class="LineNr">30 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L31" class="LineNr">31 </span>  ]
<span id="L32" class="LineNr">32 </span>]
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span><span class="muScenario">scenario</span