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<a href='https://github.com/akkartik/mu/blob/master/subx/059read-byte.subx'>https://github.com/akkartik/mu/blob/master/subx/059read-byte.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># read-byte: one higher-level abstraction atop 'read'.</span>
<span id="L2" class="LineNr">  2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr">  3 </span><span class="subxComment"># There are many situations where 'read' is a lot to manage, and we need</span>
<span id="L4" class="LineNr">  4 </span><span class="subxComment"># to abstract some details away. One of them is when we want to read a file</span>
<span id="L5" class="LineNr">  5 </span><span class="subxComment"># character by character. In this situation we follow C's FILE data structure,</span>
<span id="L6" class="LineNr">  6 </span><span class="subxComment"># which manages the underlying file descriptor together with the buffer it</span>
<span id="L7" class="LineNr">  7 </span><span class="subxComment"># reads into. We call our version 'buffered-file'. Should be useful with other</span>
<span id="L8" class="LineNr">  8 </span><span class="subxComment"># primitives as well, in later layers.</span>
<span id="L9" class="LineNr">  9 </span>
<span id="L10" class="LineNr"> 10 </span>== data
<span id="L11" class="LineNr"> 11 </span>
<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># The buffered file for standard input. Also illustrates the layout for</span>
<span id="L13" class="LineNr"> 13 </span><span class="subxComment"># buffered-file.</span>
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="SpecialChar">Stdin</span>:
<span id="L16" class="LineNr"> 16 </span>    <span class="subxComment"># file descriptor or (address stream)</span>
<span id="L17" class="LineNr"> 17 </span>    00 00 00 00  <span class="subxComment"># 0 = standard input</span>
<span id="L18" class="LineNr"> 18 </span>    <span class="subxComment"># current write index</span>
<span id="L19" class="LineNr"> 19 </span>    00 00 00 00
<span id="L20" class="LineNr"> 20 </span>    <span class="subxComment"># current read index</span>
<span id="L21" class="LineNr"> 21 </span>    00 00 00 00
<span id="L22" class="LineNr"> 22 </span>    <span class="subxComment"># length (8)</span>
<span id="L23" class="LineNr"> 23 </span>    08 00 00 00
<span id="L24" class="LineNr"> 24 </span>    <span class="subxComment"># data</span>
<span id="L25" class="LineNr"> 25 </span>    00 00 00 00 00 00 00 00  <span class="subxComment"># 8 bytes</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="subxComment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency.</span>
<span id="L28" class="LineNr"> 28 </span>
<span id="L29" class="LineNr"> 29 </span>== code
<span id="L30" class="LineNr"> 30 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L31" class="LineNr"> 31 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L32" class="LineNr"> 32 </span><span class="subxS1Comment"># . 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</span>
<span id="L33" class="LineNr"> 33 </span>
<span id="L34" class="LineNr"> 34 </span><span class="subxComment"># main:</span>
<span id="L35" class="LineNr"> 35 </span>    e8/call  run-tests/disp32  <span class="subxComment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
<span id="L36" class="LineNr"> 36 </span><span class="CommentedCode">#?     e8/call  test-read-byte-multiple/disp32</span>
<span id="L37" class="LineNr"> 37 </span>    <span class="subxComment"># syscall(exit, Num-test-failures)</span>
<span id="L38" class="LineNr"> 38 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          3/r32/EBX   <span class="SpecialChar">Num-test-failures</span>/disp32          <span class="subxComment"># copy *Num-test-failures to EBX</span>
<span id="L39" class="LineNr"> 39 </span>    b8/copy-to-EAX  1/imm32
<span id="L40" class="LineNr"> 40 </span>    cd/syscall  0x80/imm8
<span id="L41" class="LineNr"> 41 </span>
<span id="L42" class="LineNr"> 42 </span><span class="subxComment"># return next byte value in EAX, with top 3 bytes cleared.</span>
<span id="L43" class="LineNr"> 43 </span><span class="subxComment"># On EOF, return 0xffffffff.</span>
<span id="L44" class="LineNr"> 44 </span>read-byte:  <span class="subxComment"># f : (address buffered-file) -&gt; byte/EAX</span>
<span id="L45" class="LineNr"> 45 </span>    <span class="subxS1Comment"># . prolog</span>
<span id="L46" class="LineNr"> 46 </span>    55/push-EBP
<span id="L47" class="LineNr"> 47 </span>    89/copy                         3/mod/direct    5/rm32/EBP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
<span id="L48" class="LineNr"> 48 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L49" class="LineNr"> 49 </span>    51/push-ECX
<span id="L50" class="LineNr"> 50 </span>    56/push-ESI
<span id="L51" class="LineNr"> 51 </span>    <span class="subxComment"># ESI = f</span>
<span id="L52" class="LineNr"> 52 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          6/r32/ESI   8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+8) to ESI</span>
<span id="L53" class="LineNr"> 53 </span>    <span class="subxComment"># ECX = f-&gt;read</span>
<span id="L54" class="LineNr"> 54 </span>    8b/copy                         1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          1/r32/ECX   8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(ESI+8) to ECX</span>
<span id="L55" class="LineNr"> 55 </span>    <span class="subxComment"># if (f-&gt;read &lt; f-&gt;write) read byte from stream</span>
<span id="L56" class="LineNr"> 56 </span>    3b/compare                      1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          1/r32/ECX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># compare ECX with *(ESI+4)</span>
<span id="L57" class="LineNr"> 57 </span>    7c/jump-if-lesser  $read-byte:from-stream/disp8
<span id="L58" class="LineNr"> 58 </span>    <span class="subxComment"># otherwise first populate stream from file</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="subxS1Comment"># . clear-stream(stream = f+4)</span>
<span id="L60" class="LineNr"> 60 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L61" class="LineNr"> 61 </span>    8d/copy-address                 1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESI+4 to EAX</span>
<span id="L62" class="LineNr"> 62 </span>    50/push-EAX
<span id="L63" class="LineNr"> 63 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L64" class="LineNr"> 64 </span>    e8/call  clear-stream/disp32
<span id="L65" class="LineNr"> 65 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L66" class="LineNr"> 66 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L67" class="LineNr"> 67 </span>    <span class="subxS1Comment"># . EAX = read(f-&gt;fd, stream = f+4)</span>
<span id="L68" class="LineNr"> 68 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L69" class="LineNr"> 69 </span>    50/push-EAX
<span id="L70" class="LineNr"> 70 </span>    ff          6/subop/push        0/mod/indirect  6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># push *ESI</span>
<span id="L71" class="LineNr"> 71 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L72" class="LineNr"> 72 </span>    e8/call  read/disp32
<span id="L73" class="LineNr"> 73 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L74" class="LineNr"> 74 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L75" class="LineNr"> 75 </span>    <span class="subxComment"># if EAX = 0 return 0xffffffff</span>
<span id="L76" class="LineNr"> 76 </span>    81          7/subop/compare     3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0/imm32           <span class="subxComment"># compare EAX</span>
<span id="L77" class="LineNr"> 77 </span>    75/jump-if-not-equal  $read-byte:from-stream/disp8
<span id="L78" class="LineNr"> 78 </span>    b8/copy-to-EAX  0xffffffff/imm32
<span id="L79" class="LineNr"> 79 </span>    eb/jump  $read-byte:end/disp8
<span id="L80" class="LineNr"> 80 </span>$read-byte:from-stream:
<span id="L81" class="LineNr"> 81 </span>    <span class="subxComment"># reading from stream</span>
<span id="L82" class="LineNr"> 82 </span>    <span class="subxComment"># AL = f-&gt;data[f-&gt;read]</span>
<span id="L83" class="LineNr"> 83 </span>    31/xor                          3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># clear EAX</span>
<span id="L84" class="LineNr"> 84 </span>    8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/ESI  1/index/ECX  <span class="CommentedCode"> . </span>          0/r32/AL    0x10/disp8     <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(ESI+ECX+16) to AL</span>
<span id="L85" class="LineNr"> 85 </span>    <span class="subxComment"># ++f-&gt;read</span>
<span id="L86" class="LineNr"> 86 </span>    ff          0/subop/increment   1/mod/*+disp8   6/rm32/ESI   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># increment *(ESI+8)</span>
<span id="L87" class="LineNr"> 87 </span>$read-byte:end:
<span id="L88" class="LineNr"> 88 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L89" class="LineNr"> 89 </span>    5e/pop-to-ESI
<span id="L90" class="LineNr"> 90 </span>    59/pop-to-ECX
<span id="L91" class="LineNr"> 91 </span>    <span class="subxS1Comment"># . epilog</span>
<span id="L92" class="LineNr"> 92 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
<span id="L93" class="LineNr"> 93 </span>    5d/pop-to-EBP
<span id="L94" class="LineNr"> 94 </span>    c3/return
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="subxComment"># todo: how should write-byte look? What should it do when the output has no</span>
<span id="L97" class="LineNr"> 97 </span><span class="subxComment"># space remaining? Maybe return an error code.</span>
<span id="L98" class="LineNr"> 98 </span>
<span id="L99" class="LineNr"> 99 </span><span class="subxH1Comment"># - tests</span>
<span id="L100" class="LineNr">100 </span>
<span id="L101" class="LineNr">101 </span>test-read-byte-single:
<span id="L102" class="LineNr">102 </span>    <span class="subxH1Comment"># - check that read-byte returns first byte of 'file'</span>
<span id="L103" class="LineNr">103 </span>    <span class="subxComment"># setup</span>
<span id="L104" class="LineNr">104 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L105" class="LineNr">105 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L106" class="LineNr">106 </span>    68/push  _test-stream/imm32
<span id="L107" class="LineNr">107 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L108" class="LineNr">108 </span>    e8/call  clear-stream/disp32
<span id="L109" class="LineNr">109 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L110" class="LineNr">110 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L111" class="LineNr">111 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
<span id="L112" class="LineNr">112 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L113" class="LineNr">113 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
<span id="L114" class="LineNr">114 </span>    05/add-to-EAX  4/imm32
<span id="L115" class="LineNr">115 </span>    50/push-EAX
<span id="L116" class="LineNr">116 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L117" class="LineNr">117 </span>    e8/call  clear-stream/disp32
<span id="L118" class="LineNr">118 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L119" class="LineNr">119 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L120" class="LineNr">120 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
<span id="L121" class="LineNr">121 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L122" class="LineNr">122 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
<span id="L123" class="LineNr">123 </span>    68/push  _test-stream/imm32
<span id="L124" class="LineNr">124 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L125" class="LineNr">125 </span>    e8/call  write/disp32
<span id="L126" class="LineNr">126 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L127" class="LineNr">127 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L128" class="LineNr">128 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
<span id="L129" class="LineNr">129 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L130" class="LineNr">130 </span>    68/push  _test-buffered-file/imm32
<span id="L131" class="LineNr">131 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L132" class="LineNr">132 </span>    e8/call  read-byte/disp32
<span id="L133" class="LineNr">133 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L134" class="LineNr">134 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L135" class="LineNr">135 </span>    <span class="subxComment"># check-ints-equal(EAX, 'A')</span>
<span id="L136" class="LineNr">136 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L137" class="LineNr">137 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-single&quot;</span>/imm32
<span id="L138" class="LineNr">138 </span>    68/push  0x41/imm32
<span id="L139" class="LineNr">139 </span>    50/push-EAX
<span id="L140" class="LineNr">140 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L141" class="LineNr">141 </span>    e8/call  check-ints-equal/disp32
<span id="L142" class="LineNr">142 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L143" class="LineNr">143 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xc/imm32         <span class="subxComment"># add to ESP</span>
<span id="L144" class="LineNr">144 </span>    <span class="subxS1Comment"># . end</span>
<span id="L145" class="LineNr">145 </span>    c3/return
<span id="L146" class="LineNr">146 </span>
<span id="L147" class="LineNr">147 </span>test-read-byte-multiple:
<span id="L148" class="LineNr">148 </span>    <span class="subxH1Comment"># - call read-byte twice, check that second call returns second byte</span>
<span id="L149" class="LineNr">149 </span>    <span class="subxComment"># setup</span>
<span id="L150" class="LineNr">150 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L151" class="LineNr">151 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L152" class="LineNr">152 </span>    68/push  _test-stream/imm32
<span id="L153" class="LineNr">153 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L154" class="LineNr">154 </span>    e8/call  clear-stream/disp32
<span id="L155" class="LineNr">155 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L156" class="LineNr">156 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L157" class="LineNr">157 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
<span id="L158" class="LineNr">158 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L159" class="LineNr">159 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
<span id="L160" class="LineNr">160 </span>    05/add-to-EAX  4/imm32
<span id="L161" class="LineNr">161 </span>    50/push-EAX
<span id="L162" class="LineNr">162 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L163" class="LineNr">163 </span>    e8/call  clear-stream/disp32
<span id="L164" class="LineNr">164 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L165" class="LineNr">165 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L166" class="LineNr">166 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
<span id="L167" class="LineNr">167 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L168" class="LineNr">168 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
<span id="L169" class="LineNr">169 </span>    68/push  _test-stream/imm32
<span id="L170" class="LineNr">170 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L171" class="LineNr">171 </span>    e8/call  write/disp32
<span id="L172" class="LineNr">172 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L173" class="LineNr">173 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L174" class="LineNr">174 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
<span id="L175" class="LineNr">175 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L176" class="LineNr">176 </span>    68/push  _test-buffered-file/imm32
<span id="L177" class="LineNr">177 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L178" class="LineNr">178 </span>    e8/call  read-byte/disp32
<span id="L179" class="LineNr">179 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L180" class="LineNr">180 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L181" class="LineNr">181 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
<span id="L182" class="LineNr">182 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L183" class="LineNr">183 </span>    68/push  _test-buffered-file/imm32
<span id="L184" class="LineNr">184 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L185" class="LineNr">185 </span>    e8/call  read-byte/disp32
<span id="L186" class="LineNr">186 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L187" class="LineNr">187 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L188" class="LineNr">188 </span>    <span class="subxComment"># check-ints-equal(EAX, 'b')</span>
<span id="L189" class="LineNr">189 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L190" class="LineNr">190 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-multiple&quot;</span>/imm32
<span id="L191" class="LineNr">191 </span>    68/push  0x62/imm32
<span id="L192" class="LineNr">192 </span>    50/push-EAX
<span id="L193" class="LineNr">193 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L194" class="LineNr">194 </span>    e8/call  check-ints-equal/disp32
<span id="L195" class="LineNr">195 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L196" class="LineNr">196 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xc/imm32         <span class="subxComment"># add to ESP</span>
<span id="L197" class="LineNr">197 </span>    <span class="subxS1Comment"># . end</span>
<span id="L198" class="LineNr">198 </span>    c3/return
<span id="L199" class="LineNr">199 </span>
<span id="L200" class="LineNr">200 </span>test-read-byte-end-of-file:
<span id="L201" class="LineNr">201 </span>    <span class="subxH1Comment"># - call read-byte on an empty 'file', check that it returns -1</span>
<span id="L202" class="LineNr">202 </span>    <span class="subxComment"># setup</span>
<span id="L203" class="LineNr">203 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L204" class="LineNr">204 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L205" class="LineNr">205 </span>    68/push  _test-stream/imm32
<span id="L206" class="LineNr">206 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L207" class="LineNr">207 </span>    e8/call  clear-stream/disp32
<span id="L208" class="LineNr">208 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L209" class="LineNr">209 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L210" class="LineNr">210 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
<span id="L211" class="LineNr">211 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L212" class="LineNr">212 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
<span id="L213" class="LineNr">213 </span>    05/add-to-EAX  4/imm32
<span id="L214" class="LineNr">214 </span>    50/push-EAX
<span id="L215" class="LineNr">215 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L216" class="LineNr">216 </span>    e8/call  clear-stream/disp32
<span id="L217" class="LineNr">217 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L218" class="LineNr">218 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L219" class="LineNr">219 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
<span id="L220" class="LineNr">220 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L221" class="LineNr">221 </span>    68/push  _test-buffered-file/imm32
<span id="L222" class="LineNr">222 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L223" class="LineNr">223 </span>    e8/call  read-byte/disp32
<span id="L224" class="LineNr">224 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L225" class="LineNr">225 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
<span id="L226" class="LineNr">226 </span>    <span class="subxComment"># check-ints-equal(EAX, -1)</span>
<span id="L227" class="LineNr">227 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L228" class="LineNr">228 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-end-of-file&quot;</span>/imm32
<span id="L229" class="LineNr">229 </span>    68/push  -1/imm32
<span id="L230" class="LineNr">230 </span>    50/push-EAX
<span id="L231" class="LineNr">231 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L232" class="LineNr">232 </span>    e8/call  check-ints-equal/disp32
<span id="L233" class="LineNr">233 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L234" class="LineNr">234 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xc/imm32         <span class="subxComment"># add to ESP</span>
<span id="L235" class="LineNr">235 </span>    <span class="subxS1Comment"># . end</span>
<span id="L236" class="LineNr">236 </span>    c3/return
<span id="L237" class="LineNr">237 </span>
<span id="L238" class="LineNr">238 </span>== data
<span id="L239" class="LineNr">239 </span>
<span id="L240" class="LineNr">240 </span>_test-buffered-file:
<span id="L241" class="LineNr">241 </span>    <span class="subxComment"># file descriptor or (address stream)</span>
<span id="L242" class="LineNr">242 </span>    _test-stream/imm32
<span id="L243" class="LineNr">243 </span>    <span class="subxComment"># current write index</span>
<span id="L244" class="LineNr">244 </span>    00 00 00 00
<span id="L245" class="LineNr">245 </span>    <span class="subxComment"># current read index</span>
<span id="L246" class="LineNr">246 </span>    00 00 00 00
<span id="L247" class="LineNr">247 </span>    <span class="subxComment"># length (8)</span>
<span id="L248" class="LineNr">248 </span>    08 00 00 00
<span id="L249" class="LineNr">249 </span>    <span class="subxComment"># data</span>
<span id="L250" class="LineNr">250 </span>    00 00 00 00 00 00 00 00  <span class="subxComment"># 8 bytes</span>
<span id="L251" class="LineNr">251 </span>
<span id="L252" class="LineNr">252 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
</pre>
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<!-- vim: set foldmethod=manual : -->
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2025-05-31 16:23:54 +0000
result) proc lenField(p: BProc): Rope = result = rope(if p.module.compileToCpp: "len" else: "Sup.len") include ccgcalls, "ccgstmts.nim" proc initFrame(p: BProc, procname, filename: Rope): Rope = discard cgsym(p.module, "nimFrame") if p.maxFrameLen > 0: discard cgsym(p.module, "VarSlot") result = ropecg(p.module, "\tnimfrs_($1, $2, $3, $4);$n", procname, filename, p.maxFrameLen.rope, p.blocks[0].frameLen.rope) else: result = ropecg(p.module, "\tnimfr_($1, $2);$n", procname, filename) proc initFrameNoDebug(p: BProc; frame, procname, filename: Rope; line: int): Rope = discard cgsym(p.module, "nimFrame") addf(p.blocks[0].sections[cpsLocals], "TFrame $1;$n", [frame]) result = ropecg(p.module, "\t$1.procname = $2; $1.filename = $3; " & " $1.line = $4; $1.len = -1; nimFrame(&$1);$n", frame, procname, filename, rope(line)) proc deinitFrameNoDebug(p: BProc; frame: Rope): Rope = result = ropecg(p.module, "\t#popFrameOfAddr(&$1);$n", frame) proc deinitFrame(p: BProc): Rope = result = ropecg(p.module, "\t#popFrame();$n") include ccgexprs # ----------------------------- dynamic library handling ----------------- # We don't finalize dynamic libs as the OS does this for us. proc isGetProcAddr(lib: PLib): bool = let n = lib.path result = n.kind in nkCallKinds and n.typ != nil and n.typ.kind in {tyPointer, tyProc} proc loadDynamicLib(m: BModule, lib: PLib) = assert(lib != nil) if not lib.generated: lib.generated = true var tmp = getTempName(m) assert(lib.name == nil) lib.name = tmp # BUGFIX: cgsym has awful side-effects addf(m.s[cfsVars], "static void* $1;$n", [tmp]) if lib.path.kind in {nkStrLit..nkTripleStrLit}: var s: TStringSeq = @[] libCandidates(lib.path.strVal, s) rawMessage(m.config, hintDependency, lib.path.strVal) var loadlib: Rope = nil for i in countup(0, high(s)): inc(m.labels) if i > 0: add(loadlib, "||") let n = newStrNode(nkStrLit, s[i]) n.info = lib.path.info appcg(m, loadlib, "($1 = #nimLoadLibrary($2))$n", [tmp, genStringLiteral(m, n)]) appcg(m, m.s[cfsDynLibInit], "if (!($1)) #nimLoadLibraryError($2);$n", [loadlib, genStringLiteral(m, lib.path)]) else: var p = newProc(nil, m) p.options = p.options - {optStackTrace, optEndb} var dest: TLoc initLocExpr(p, lib.path, dest) add(m.s[cfsVars], p.s(cpsLocals)) add(m.s[cfsDynLibInit], p.s(cpsInit)) add(m.s[cfsDynLibInit], p.s(cpsStmts)) appcg(m, m.s[cfsDynLibInit], "if (!($1 = #nimLoadLibrary($2))) #nimLoadLibraryError($2);$n", [tmp, rdLoc(dest)]) if lib.name == nil: internalError(m.config, "loadDynamicLib") proc mangleDynLibProc(sym: PSym): Rope = if sfCompilerProc in sym.flags: # NOTE: sym.loc.r is the external name! result = rope(sym.name.s) else: result = "Dl_$1_" % [rope(sym.id)] proc symInDynamicLib(m: BModule, sym: PSym) = var lib = sym.annex let isCall = isGetProcAddr(lib) var extname = sym.loc.r if not isCall: loadDynamicLib(m, lib) var tmp = mangleDynLibProc(sym) sym.loc.r = tmp # from now on we only need the internal name sym.typ.sym = nil # generate a new name inc(m.labels, 2) if isCall: let n = lib.path var a: TLoc initLocExpr(m.initProc, n[0], a) var params = rdLoc(a) & "(" for i in 1 .. n.len-2: initLocExpr(m.initProc, n[i], a) params.add(rdLoc(a)) params.add(", ") let load = "\t$1 = ($2) ($3$4));$n" % [tmp, getTypeDesc(m, sym.typ), params, makeCString($extname)] var last = lastSon(n) if last.kind == nkHiddenStdConv: last = last.sons[1] internalAssert(m.config, last.kind == nkStrLit) let idx = last.strVal if idx.len == 0: add(m.initProc.s(cpsStmts), load) elif idx.len == 1 and idx[0] in {'0'..'9'}: add(m.extensionLoaders[idx[0]], load) else: internalError(m.config, sym.info, "wrong index: " & idx) else: appcg(m, m.s[cfsDynLibInit], "\t$1 = ($2) #nimGetProcAddr($3, $4);$n", [tmp, getTypeDesc(m, sym.typ), lib.name, makeCString($extname)]) addf(m.s[cfsVars], "$2 $1;$n", [sym.loc.r, getTypeDesc(m, sym.loc.t)]) proc varInDynamicLib(m: BModule, sym: PSym) = var lib = sym.annex var extname = sym.loc.r loadDynamicLib(m, lib) incl(sym.loc.flags, lfIndirect) var tmp = mangleDynLibProc(sym) sym.loc.r = tmp # from now on we only need the internal name inc(m.labels, 2) appcg(m, m.s[cfsDynLibInit], "$1 = ($2*) #nimGetProcAddr($3, $4);$n", [tmp, getTypeDesc(m, sym.typ), lib.name, makeCString($extname)]) addf(m.s[cfsVars], "$2* $1;$n", [sym.loc.r, getTypeDesc(m, sym.loc.t)]) proc symInDynamicLibPartial(m: BModule, sym: PSym) = sym.loc.r = mangleDynLibProc(sym) sym.typ.sym = nil # generate a new name proc cgsym(m: BModule, name: string): Rope = let sym = magicsys.getCompilerProc(m.g.graph, name) if sym != nil: case sym.kind of skProc, skFunc, skMethod, skConverter, skIterator: genProc(m, sym) of skVar, skResult, skLet: genVarPrototype(m, newSymNode sym) of skType: discard getTypeDesc(m, sym.typ) else: internalError(m.config, "cgsym: " & name & ": " & $sym.kind) else: # we used to exclude the system module from this check, but for DLL # generation support this sloppyness leads to hard to detect bugs, so # we're picky here for the system module too: rawMessage(m.config, errGenerated, "system module needs: " & name) result = sym.loc.r proc generateHeaders(m: BModule) = add(m.s[cfsHeaders], "\L#include \"nimbase.h\"\L") for it in m.headerFiles: if it[0] == '#': add(m.s[cfsHeaders], rope(it.replace('`', '"') & "\L")) elif it[0] notin {'\"', '<'}: addf(m.s[cfsHeaders], "#include \"$1\"$N", [rope(it)]) else: addf(m.s[cfsHeaders], "#include $1$N", [rope(it)]) add(m.s[cfsHeaders], "#undef LANGUAGE_C\L") add(m.s[cfsHeaders], "#undef MIPSEB\L") add(m.s[cfsHeaders], "#undef MIPSEL\L") add(m.s[cfsHeaders], "#undef PPC\L") add(m.s[cfsHeaders], "#undef R3000\L") add(m.s[cfsHeaders], "#undef R4000\L") add(m.s[cfsHeaders], "#undef i386\L") add(m.s[cfsHeaders], "#undef linux\L") add(m.s[cfsHeaders], "#undef mips\L") add(m.s[cfsHeaders], "#undef near\L") add(m.s[cfsHeaders], "#undef powerpc\L") add(m.s[cfsHeaders], "#undef unix\L") proc openNamespaceNim(): Rope = result.add("namespace Nim {\L") proc closeNamespaceNim(): Rope = result.add("}\L") proc closureSetup(p: BProc, prc: PSym) = if tfCapturesEnv notin prc.typ.flags: return # prc.ast[paramsPos].last contains the type we're after: var ls = lastSon(prc.ast[paramsPos]) if ls.kind != nkSym: internalError(p.config, prc.info, "closure generation failed") var env = ls.sym #echo "created environment: ", env.id, " for ", prc.name.s assignLocalVar(p, ls) # generate cast assignment: linefmt(p, cpsStmts, "$1 = ($2) ClE_0;$n", rdLoc(env.loc), getTypeDesc(p.module, env.typ)) proc containsResult(n: PNode): bool = if n.kind == nkSym and n.sym.kind == skResult: result = true else: for i in 0..<n.safeLen: if containsResult(n[i]): return true proc easyResultAsgn(n: PNode): PNode = const harmless = {nkConstSection, nkTypeSection, nkEmpty, nkCommentStmt} + declarativeDefs case n.kind of nkStmtList, nkStmtListExpr: var i = 0 while i < n.len and n[i].kind in harmless: inc i if i < n.len: result = easyResultAsgn(n[i]) of nkAsgn, nkFastAsgn: if n[0].kind == nkSym and n[0].sym.kind == skResult and not containsResult(n[1]): incl n.flags, nfPreventCg return n[1] of nkReturnStmt: if n.len > 0: result = easyResultAsgn(n[0]) if result != nil: incl n.flags, nfPreventCg else: discard proc genProcAux(m: BModule, prc: PSym) = var p = newProc(prc, m) var header = genProcHeader(m, prc) var returnStmt: Rope = nil assert(prc.ast != nil) if sfPure notin prc.flags and prc.typ.sons[0] != nil: if resultPos >= prc.ast.len: internalError(m.config, prc.info, "proc has no result symbol") let resNode = prc.ast.sons[resultPos] let res = resNode.sym # get result symbol if not isInvalidReturnType(m.config, prc.typ.sons[0]): if sfNoInit in prc.flags: incl(res.flags, sfNoInit) if sfNoInit in prc.flags and p.module.compileToCpp and (let val = easyResultAsgn(prc.getBody); val != nil): var decl = localVarDecl(p, resNode) var a: TLoc initLocExprSingleUse(p, val, a) linefmt(p, cpsStmts, "$1 = $2;$n", decl, rdLoc(a)) else: # declare the result symbol: assignLocalVar(p, resNode) assert(res.loc.r != nil) initLocalVar(p, res, immediateAsgn=false) returnStmt = ropecg(p.module, "\treturn $1;$n", rdLoc(res.loc)) else: fillResult(p.config, resNode) assignParam(p, res) if sfNoInit notin prc.flags: resetLoc(p, res.loc) if skipTypes(res.typ, abstractInst).kind == tyArray: #incl(res.loc.flags, lfIndirect) res.loc.storage = OnUnknown for i in countup(1, sonsLen(prc.typ.n) - 1): let param = prc.typ.n.sons[i].sym if param.typ.isCompileTimeOnly: continue assignParam(p, param) closureSetup(p, prc) genStmts(p, prc.getBody) # modifies p.locals, p.init, etc. var generatedProc: Rope if sfNoReturn in prc.flags: if hasDeclspec in extccomp.CC[p.config.cCompiler].props: header = "__declspec(noreturn) " & header if sfPure in prc.flags: if hasDeclspec in extccomp.CC[p.config.cCompiler].props: header = "__declspec(naked) " & header generatedProc = ropecg(p.module, "$N$1 {$n$2$3$4}$N$N", header, p.s(cpsLocals), p.s(cpsInit), p.s(cpsStmts)) else: generatedProc = ropecg(p.module, "$N$1 {$N", header) add(generatedProc, initGCFrame(p)) if optStackTrace in prc.options: add(generatedProc, p.s(cpsLocals)) var procname = makeCString(prc.name.s) add(generatedProc, initFrame(p, procname, quotedFilename(p.config, prc.info))) else: add(generatedProc, p.s(cpsLocals)) if optProfiler in prc.options: # invoke at proc entry for recursion: appcg(p, cpsInit, "\t#nimProfile();$n", []) if p.beforeRetNeeded: add(generatedProc, "{") add(generatedProc, p.s(cpsInit)) add(generatedProc, p.s(cpsStmts)) if p.beforeRetNeeded: add(generatedProc, ~"\t}BeforeRet_: ;$n") add(generatedProc, deinitGCFrame(p)) if optStackTrace in prc.options: add(generatedProc, deinitFrame(p)) add(generatedProc, returnStmt) add(generatedProc, ~"}$N") add(m.s[cfsProcs], generatedProc) proc requiresExternC(m: BModule; sym: PSym): bool {.inline.} = result = (sfCompileToCpp in m.module.flags and sfCompileToCpp notin sym.getModule().flags and m.config.cmd != cmdCompileToCpp) or ( sym.flags * {sfImportc, sfInfixCall, sfCompilerProc} == {sfImportc} and sym.magic == mNone and m.config.cmd == cmdCompileToCpp) proc genProcPrototype(m: BModule, sym: PSym) = useHeader(m, sym) if lfNoDecl in sym.loc.flags: return if lfDynamicLib in sym.loc.flags: if getModule(sym).id != m.module.id and not containsOrIncl(m.declaredThings, sym.id): add(m.s[cfsVars], ropecg(m, "extern $1 $2;$n", getTypeDesc(m, sym.loc.t), mangleDynLibProc(sym))) elif not containsOrIncl(m.declaredProtos, sym.id): var header = genProcHeader(m, sym) if sfNoReturn in sym.flags and hasDeclspec in extccomp.CC[m.config.cCompiler].props: header = "__declspec(noreturn) " & header if sym.typ.callConv != ccInline and requiresExternC(m, sym): header = "extern \"C\" " & header if sfPure in sym.flags and hasAttribute in CC[m.config.cCompiler].props: header.add(" __attribute__((naked))") if sfNoReturn in sym.flags and hasAttribute in CC[m.config.cCompiler].props: header.add(" __attribute__((noreturn))") add(m.s[cfsProcHeaders], ropecg(m, "$1;$n", header)) proc genProcNoForward(m: BModule, prc: PSym) = if lfImportCompilerProc in prc.loc.flags: fillProcLoc(m, prc.ast[namePos]) useHeader(m, prc) # dependency to a compilerproc: discard cgsym(m, prc.name.s) return if lfNoDecl in prc.loc.flags: fillProcLoc(m, prc.ast[namePos]) useHeader(m, prc) genProcPrototype(m, prc) elif prc.typ.callConv == ccInline: # We add inline procs to the calling module to enable C based inlining. # This also means that a check with ``q.declaredThings`` is wrong, we need # a check for ``m.declaredThings``. if not containsOrIncl(m.declaredThings, prc.id): #if prc.loc.k == locNone: fillProcLoc(m, prc.ast[namePos]) #elif {sfExportc, sfImportc} * prc.flags == {}: # # reset name to restore consistency in case of hashing collisions: # echo "resetting ", prc.id, " by ", m.module.name.s # prc.loc.r = nil # prc.loc.r = mangleName(m, prc) useHeader(m, prc) genProcPrototype(m, prc) genProcAux(m, prc) elif lfDynamicLib in prc.loc.flags: var q = findPendingModule(m, prc) fillProcLoc(q, prc.ast[namePos]) useHeader(m, prc) genProcPrototype(m, prc) if q != nil and not containsOrIncl(q.declaredThings, prc.id): symInDynamicLib(q, prc) else: symInDynamicLibPartial(m, prc) elif sfImportc notin prc.flags: var q = findPendingModule(m, prc) fillProcLoc(q, prc.ast[namePos]) useHeader(m, prc) genProcPrototype(m, prc) if q != nil and not containsOrIncl(q.declaredThings, prc.id): genProcAux(q, prc) else: fillProcLoc(m, prc.ast[namePos]) useHeader(m, prc) if sfInfixCall notin prc.flags: genProcPrototype(m, prc) proc requestConstImpl(p: BProc, sym: PSym) = var m = p.module useHeader(m, sym) if sym.loc.k == locNone: fillLoc(sym.loc, locData, sym.ast, mangleName(p.module, sym), OnStatic) if lfNoDecl in sym.loc.flags: return # declare implementation: var q = findPendingModule(m, sym) if q != nil and not containsOrIncl(q.declaredThings, sym.id): assert q.initProc.module == q addf(q.s[cfsData], "NIM_CONST $1 $2 = $3;$n", [getTypeDesc(q, sym.typ), sym.loc.r, genConstExpr(q.initProc, sym.ast)]) # declare header: if q != m and not containsOrIncl(m.declaredThings, sym.id): assert(sym.loc.r != nil) let headerDecl = "extern NIM_CONST $1 $2;$n" % [getTypeDesc(m, sym.loc.t), sym.loc.r] add(m.s[cfsData], headerDecl) if sfExportc in sym.flags and p.module.g.generatedHeader != nil: add(p.module.g.generatedHeader.s[cfsData], headerDecl) proc isActivated(prc: PSym): bool = prc.typ != nil proc genProc(m: BModule, prc: PSym) = if sfBorrow in prc.flags or not isActivated(prc): return if sfForward in prc.flags: addForwardedProc(m, prc) fillProcLoc(m, prc.ast[namePos]) else: genProcNoForward(m, prc) if {sfExportc, sfCompilerProc} * prc.flags == {sfExportc} and m.g.generatedHeader != nil and lfNoDecl notin prc.loc.flags: genProcPrototype(m.g.generatedHeader, prc) if prc.typ.callConv == ccInline: if not containsOrIncl(m.g.generatedHeader.declaredThings, prc.id): genProcAux(m.g.generatedHeader, prc) proc genVarPrototype(m: BModule, n: PNode) = #assert(sfGlobal in sym.flags) let sym = n.sym useHeader(m, sym) fillLoc(sym.loc, locGlobalVar, n, mangleName(m, sym), OnHeap) if (lfNoDecl in sym.loc.flags) or containsOrIncl(m.declaredThings, sym.id): return if sym.owner.id != m.module.id: # else we already have the symbol generated! assert(sym.loc.r != nil) if sfThread in sym.flags: declareThreadVar(m, sym, true) else: add(m.s[cfsVars], "extern ") add(m.s[cfsVars], getTypeDesc(m, sym.loc.t)) if lfDynamicLib in sym.loc.flags: add(m.s[cfsVars], "*") if sfRegister in sym.flags: add(m.s[cfsVars], " register") if sfVolatile in sym.flags: add(m.s[cfsVars], " volatile") addf(m.s[cfsVars], " $1;$n", [sym.loc.r]) proc addIntTypes(result: var Rope; conf: ConfigRef) {.inline.} = addf(result, "#define NIM_NEW_MANGLING_RULES\L" & "#define NIM_INTBITS $1\L", [ platform.CPU[conf.target.targetCPU].intSize.rope]) if optUseNimNamespace in conf.globalOptions: result.add("#define USE_NIM_NAMESPACE\L") proc getCopyright(conf: ConfigRef; cfile: Cfile): Rope = if optCompileOnly in conf.globalOptions: result = ("/* Generated by Nim Compiler v$1 */$N" & "/* (c) " & copyrightYear & " Andreas Rumpf */$N" & "/* The generated code is subject to the original license. */$N") % [rope(VersionAsString)] else: result = ("/* Generated by Nim Compiler v$1 */$N" & "/* (c) " & copyrightYear & " Andreas Rumpf */$N" & "/* The generated code is subject to the original license. */$N" & "/* Compiled for: $2, $3, $4 */$N" & "/* Command for C compiler:$n $5 */$N") % [rope(VersionAsString), rope(platform.OS[conf.target.targetOS].name), rope(platform.CPU[conf.target.targetCPU].name), rope(extccomp.CC[conf.cCompiler].name), rope(getCompileCFileCmd(conf, cfile))] proc getFileHeader(conf: ConfigRef; cfile: Cfile): Rope = result = getCopyright(conf, cfile) addIntTypes(result, conf) proc genFilenames(m: BModule): Rope = discard cgsym(m, "dbgRegisterFilename") result = nil for i in 0..<m.config.m.fileInfos.len: result.addf("dbgRegisterFilename($1);$N", [m.config.m.fileInfos[i].projPath.makeCString]) proc genMainProc(m: BModule) = const # The use of a volatile function pointer to call Pre/NimMainInner # prevents inlining of the NimMainInner function and dependent # functions, which might otherwise merge their stack frames. PreMainBody = "void PreMainInner(void) {$N" & "\tsystemInit000();$N" & "$1" & "$2" & "$3" & "}$N$N" & "void PreMain(void) {$N" & "\tvoid (*volatile inner)(void);$N" & "\tsystemDatInit000();$N" & "\tinner = PreMainInner;$N" & "$4$5" & "\t(*inner)();$N" & "}$N$N" MainProcs = "\tNimMain();$N" MainProcsWithResult = MainProcs & "\treturn nim_program_result;$N" NimMainInner = "N_CDECL(void, NimMainInner)(void) {$N" & "$1" & "}$N$N" NimMainProc = "N_CDECL(void, NimMain)(void) {$N" & "\tvoid (*volatile inner)(void);$N" & "\tPreMain();$N" & "\tinner = NimMainInner;$N" & "$2" & "\t(*inner)();$N" & "}$N$N" NimMainBody = NimMainInner & NimMainProc PosixNimMain = "int cmdCount;$N" & "char** cmdLine;$N" & "char** gEnv;$N" & NimMainBody PosixCMain = "int main(int argc, char** args, char** env) {$N" & "\tcmdLine = args;$N" & "\tcmdCount = argc;$N" & "\tgEnv = env;$N" & MainProcsWithResult & "}$N$N" StandaloneCMain = "int main(void) {$N" & MainProcs & "\treturn 0;$N" & "}$N$N" WinNimMain = NimMainBody WinCMain = "N_STDCALL(int, WinMain)(HINSTANCE hCurInstance, $N" & " HINSTANCE hPrevInstance, $N" & " LPSTR lpCmdLine, int nCmdShow) {$N" & MainProcsWithResult & "}$N$N" WinNimDllMain = NimMainInner & "N_LIB_EXPORT " & NimMainProc WinCDllMain = "BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, $N" & " LPVOID lpvReserved) {$N" & "\tif(fwdreason == DLL_PROCESS_ATTACH) {$N" & MainProcs & "}$N" & "\treturn 1;$N}$N$N" PosixNimDllMain = WinNimDllMain PosixCDllMain = "void NIM_POSIX_INIT NimMainInit(void) {$N" & MainProcs & "}$N$N" GenodeNimMain = "Libc::Env *genodeEnv;$N" & NimMainBody ComponentConstruct = "void Libc::Component::construct(Libc::Env &env) {$N" & "\tgenodeEnv = &env;$N" & "\tLibc::with_libc([&] () {$N\t" & MainProcs & "\t});$N" & "}$N$N" var nimMain, otherMain: FormatStr if m.config.target.targetOS == osWindows and m.config.globalOptions * {optGenGuiApp, optGenDynLib} != {}: if optGenGuiApp in m.config.globalOptions: nimMain = WinNimMain otherMain = WinCMain else: nimMain = WinNimDllMain otherMain = WinCDllMain m.includeHeader("<windows.h>") elif m.config.target.targetOS == osGenode: nimMain = GenodeNimMain otherMain = ComponentConstruct elif optGenDynLib in m.config.globalOptions: nimMain = PosixNimDllMain otherMain = PosixCDllMain elif m.config.target.targetOS == osStandalone: nimMain = PosixNimMain otherMain = StandaloneCMain else: nimMain = PosixNimMain otherMain = PosixCMain if m.g.breakpoints != nil: discard cgsym(m, "dbgRegisterBreakpoint") if optEndb in m.config.options: m.g.breakpoints.add(m.genFilenames) let initStackBottomCall = if m.config.target.targetOS == osStandalone or m.config.selectedGC == gcNone: "".rope else: ropecg(m, "\t#initStackBottomWith((void *)&inner);$N") inc(m.labels) appcg(m, m.s[cfsProcs], PreMainBody, [ m.g.mainDatInit, m.g.breakpoints, m.g.otherModsInit, if emulatedThreadVars(m.config) and m.config.target.targetOS != osStandalone: ropecg(m, "\t#initThreadVarsEmulation();$N") else: "".rope, initStackBottomCall]) appcg(m, m.s[cfsProcs], nimMain, [m.g.mainModInit, initStackBottomCall, rope(m.labels)]) if optNoMain notin m.config.globalOptions: if optUseNimNamespace in m.config.globalOptions: m.s[cfsProcs].add closeNamespaceNim() & "using namespace Nim;\L" appcg(m, m.s[cfsProcs], otherMain, []) if optUseNimNamespace in m.config.globalOptions: m.s[cfsProcs].add openNamespaceNim() proc getSomeInitName(m: PSym, suffix: string): Rope = assert m.kind == skModule assert m.owner.kind == skPackage if {sfSystemModule, sfMainModule} * m.flags == {}: result = m.owner.name.s.mangle.rope result.add "_" result.add m.name.s result.add suffix proc getInitName(m: PSym): Rope = if sfMainModule in m.flags: # generate constant name for main module, for "easy" debugging. result = rope"NimMainModule" else: result = getSomeInitName(m, "Init000") proc getDatInitName(m: PSym): Rope = getSomeInitName(m, "DatInit000") proc registerModuleToMain(g: BModuleList; m: PSym) = var init = m.getInitName datInit = m.getDatInitName addf(g.mainModProcs, "N_LIB_PRIVATE N_NIMCALL(void, $1)(void);$N", [init]) addf(g.mainModProcs, "N_LIB_PRIVATE N_NIMCALL(void, $1)(void);$N", [datInit]) if sfSystemModule notin m.flags: addf(g.mainDatInit, "\t$1();$N", [datInit]) let initCall = "\t$1();$N" % [init] if sfMainModule in m.flags: add(g.mainModInit, initCall) else: add(g.otherModsInit, initCall) proc genInitCode(m: BModule) = var initname = getInitName(m.module) var prc = "N_LIB_PRIVATE N_NIMCALL(void, $1)(void) {$N" % [initname] if m.typeNodes > 0: appcg(m, m.s[cfsTypeInit1], "static #TNimNode $1[$2];$n", [m.typeNodesName, rope(m.typeNodes)]) if m.nimTypes > 0: appcg(m, m.s[cfsTypeInit1], "static #TNimType $1[$2];$n", [m.nimTypesName, rope(m.nimTypes)]) add(prc, initGCFrame(m.initProc)) add(prc, genSectionStart(cpsLocals, m.config)) add(prc, m.preInitProc.s(cpsLocals)) add(prc, m.initProc.s(cpsLocals)) add(prc, m.postInitProc.s(cpsLocals)) add(prc, genSectionEnd(cpsLocals, m.config)) if optStackTrace in m.initProc.options and frameDeclared notin m.flags: # BUT: the generated init code might depend on a current frame, so # declare it nevertheless: incl m.flags, frameDeclared if preventStackTrace notin m.flags: var procname = makeCString(m.module.name.s) add(prc, initFrame(m.initProc, procname, quotedFilename(m.config, m.module.info))) else: add(prc, ~"\tTFrame FR_; FR_.len = 0;$N") add(prc, genSectionStart(cpsInit, m.config)) add(prc, m.preInitProc.s(cpsInit)) add(prc, m.initProc.s(cpsInit)) add(prc, m.postInitProc.s(cpsInit)) add(prc, genSectionEnd(cpsInit, m.config)) add(prc, genSectionStart(cpsStmts, m.config)) add(prc, m.preInitProc.s(cpsStmts)) add(prc, m.initProc.s(cpsStmts)) add(prc, m.postInitProc.s(cpsStmts)) add(prc, genSectionEnd(cpsStmts, m.config)) if optStackTrace in m.initProc.options and preventStackTrace notin m.flags: add(prc, deinitFrame(m.initProc)) add(prc, deinitGCFrame(m.initProc)) addf(prc, "}$N$N", []) prc.addf("N_LIB_PRIVATE N_NIMCALL(void, $1)(void) {$N", [getDatInitName(m.module)]) for i in cfsTypeInit1..cfsDynLibInit: add(prc, genSectionStart(i, m.config)) add(prc, m.s[i]) add(prc, genSectionEnd(i, m.config)) addf(prc, "}$N$N", []) # we cannot simply add the init proc to ``m.s[cfsProcs]`` anymore because # that would lead to a *nesting* of merge sections which the merger does # not support. So we add it to another special section: ``cfsInitProc`` add(m.s[cfsInitProc], prc) for i, el in pairs(m.extensionLoaders): if el != nil: let ex = "NIM_EXTERNC N_NIMCALL(void, nimLoadProcs$1)(void) {$2}$N$N" % [(i.ord - '0'.ord).rope, el] add(m.s[cfsInitProc], ex) proc genModule(m: BModule, cfile: Cfile): Rope = result = getFileHeader(m.config, cfile) result.add(genMergeInfo(m)) generateThreadLocalStorage(m) generateHeaders(m) for i in countup(cfsHeaders, cfsProcs): add(result, genSectionStart(i, m.config)) add(result, m.s[i]) add(result, genSectionEnd(i, m.config)) if optUseNimNamespace in m.config.globalOptions and i == cfsHeaders: result.add openNamespaceNim() add(result, m.s[cfsInitProc]) if optUseNimNamespace in m.config.globalOptions: result.add closeNamespaceNim() proc newPreInitProc(m: BModule): BProc = result = newProc(nil, m) # little hack so that unique temporaries are generated: result.labels = 100_000 proc newPostInitProc(m: BModule): BProc = result = newProc(nil, m) # little hack so that unique temporaries are generated: result.labels = 200_000 proc initProcOptions(m: BModule): TOptions = let opts = m.config.options if sfSystemModule in m.module.flags: opts-{optStackTrace} else: opts proc rawNewModule(g: BModuleList; module: PSym, filename: string): BModule = new(result) result.g = g result.tmpBase = rope("TM" & $hashOwner(module) & "_") result.headerFiles = @[] result.declaredThings = initIntSet() result.declaredProtos = initIntSet() result.cfilename = filename result.filename = filename result.typeCache = initTable[SigHash, Rope]() result.forwTypeCache = initTable[SigHash, Rope]() result.module = module result.typeInfoMarker = initTable[SigHash, Rope]() result.sigConflicts = initCountTable[SigHash]() result.initProc = newProc(nil, result) result.initProc.options = initProcOptions(result) result.preInitProc = newPreInitProc(result) result.postInitProc = newPostInitProc(result) initNodeTable(result.dataCache) result.typeStack = @[] result.forwardedProcs = @[] result.typeNodesName = getTempName(result) result.nimTypesName = getTempName(result) # no line tracing for the init sections of the system module so that we # don't generate a TFrame which can confuse the stack botton initialization: if sfSystemModule in module.flags: incl result.flags, preventStackTrace excl(result.preInitProc.options, optStackTrace) excl(result.postInitProc.options, optStackTrace) let ndiName = if optCDebug in g.config.globalOptions: changeFileExt(completeCFilePath(g.config, filename), "ndi") else: "" open(result.ndi, ndiName, g.config) proc nullify[T](arr: var T) = for i in low(arr)..high(arr): arr[i] = Rope(nil) proc resetModule*(m: BModule) = # between two compilations in CAAS mode, we can throw # away all the data that was written to disk m.headerFiles = @[] m.declaredProtos = initIntSet() m.forwTypeCache = initTable[SigHash, Rope]() m.initProc = newProc(nil, m) m.initProc.options = initProcOptions(m) m.preInitProc = newPreInitProc(m) m.postInitProc = newPostInitProc(m) initNodeTable(m.dataCache) m.typeStack = @[] m.forwardedProcs = @[] m.typeNodesName = getTempName(m) m.nimTypesName = getTempName(m) if sfSystemModule in m.module.flags: incl m.flags, preventStackTrace else: excl m.flags, preventStackTrace nullify m.s m.typeNodes = 0 m.nimTypes = 0 nullify m.extensionLoaders # indicate that this is now cached module # the cache will be invalidated by nullifying gModules #m.fromCache = true m.g = nil # we keep only the "merge info" information for the module # and the properties that can't change: # m.filename # m.cfilename # m.isHeaderFile # m.module ? # m.typeCache # m.declaredThings # m.typeInfoMarker # m.labels # m.FrameDeclared proc resetCgenModules*(g: BModuleList) = for m in cgenModules(g): resetModule(m) proc rawNewModule(g: BModuleList; module: PSym; conf: ConfigRef): BModule = result = rawNewModule(g, module, toFullPath(conf, module.position.FileIndex)) proc newModule(g: BModuleList; module: PSym; conf: ConfigRef): BModule = # we should create only one cgen module for each module sym result = rawNewModule(g, module, conf) if module.position >= g.modules.len: setLen(g.modules, module.position + 1) #growCache g.modules, module.position g.modules[module.position] = result template injectG() {.dirty.} = if graph.backend == nil: graph.backend = newModuleList(graph) let g = BModuleList(graph.backend) proc myOpen(graph: ModuleGraph; module: PSym; cache: IdentCache): PPassContext = injectG() result = newModule(g, module, graph.config) if optGenIndex in graph.config.globalOptions and g.generatedHeader == nil: let f = if graph.config.headerFile.len > 0: graph.config.headerFile else: graph.config.projectFull g.generatedHeader = rawNewModule(g, module, changeFileExt(completeCFilePath(graph.config, f), hExt)) incl g.generatedHeader.flags, isHeaderFile proc writeHeader(m: BModule) = var result = ("/* Generated by Nim Compiler v$1 */$N" & "/* (c) 2017 Andreas Rumpf */$N" & "/* The generated code is subject to the original license. */$N") % [rope(VersionAsString)] var guard = "__$1__" % [m.filename.splitFile.name.rope] result.addf("#ifndef $1$n#define $1$n", [guard]) addIntTypes(result, m.config) generateHeaders(m) generateThreadLocalStorage(m) for i in countup(cfsHeaders, cfsProcs): add(result, genSectionStart(i, m.config)) add(result, m.s[i]) add(result, genSectionEnd(i, m.config)) if optUseNimNamespace in m.config.globalOptions and i == cfsHeaders: result.add openNamespaceNim() add(result, m.s[cfsInitProc]) if optGenDynLib in m.config.globalOptions: result.add("N_LIB_IMPORT ") result.addf("N_CDECL(void, NimMain)(void);$n", []) if optUseNimNamespace in m.config.globalOptions: result.add closeNamespaceNim() result.addf("#endif /* $1 */$n", [guard]) if not writeRope(result, m.filename): rawMessage(m.config, errCannotOpenFile, m.filename) proc getCFile(m: BModule): string = let ext = if m.compileToCpp: ".cpp" elif m.config.cmd == cmdCompileToOC or sfCompileToObjC in m.module.flags: ".m" else: ".c" result = changeFileExt(completeCFilePath(m.config, withPackageName(m.config, m.cfilename)), ext) proc myOpenCached(graph: ModuleGraph; module: PSym, rd: PRodReader): PPassContext = injectG() var m = newModule(g, module, graph.config) readMergeInfo(getCFile(m), m) result = m proc myProcess(b: PPassContext, n: PNode): PNode = result = n if b == nil: return var m = BModule(b) if passes.skipCodegen(m.config, n): return m.initProc.options = initProcOptions(m) #softRnl = if optLineDir in m.config.options: noRnl else: rnl # XXX replicate this logic! genStmts(m.initProc, n) proc finishModule(m: BModule) = var i = 0 while i <= high(m.forwardedProcs): # Note: ``genProc`` may add to ``m.forwardedProcs``, so we cannot use # a ``for`` loop here var prc = m.forwardedProcs[i] if sfForward in prc.flags: internalError(m.config, prc.info, "still forwarded: " & prc.name.s) genProcNoForward(m, prc) inc(i) assert(m.g.forwardedProcsCounter >= i) dec(m.g.forwardedProcsCounter, i) setLen(m.forwardedProcs, 0) proc shouldRecompile(m: BModule; code: Rope, cfile: Cfile): bool = result = true if optForceFullMake notin m.config.globalOptions: if not equalsFile(code, cfile.cname): if isDefined(m.config, "nimdiff"): if fileExists(cfile.cname): copyFile(cfile.cname, cfile.cname & ".backup") echo "diff ", cfile.cname, ".backup ", cfile.cname else: echo "new file ", cfile.cname if not writeRope(code, cfile.cname): rawMessage(m.config, errCannotOpenFile, cfile.cname) return if existsFile(cfile.obj) and os.fileNewer(cfile.obj, cfile.cname): result = false else: if not writeRope(code, cfile.cname): rawMessage(m.config, errCannotOpenFile, cfile.cname) # We need 2 different logics here: pending modules (including # 'nim__dat') may require file merging for the combination of dead code # elimination and incremental compilation! Non pending modules need no # such logic and in fact the logic hurts for the main module at least; # it would generate multiple 'main' procs, for instance. proc writeModule(m: BModule, pending: bool) = # generate code for the init statements of the module: let cfile = getCFile(m) if true or optForceFullMake in m.config.globalOptions: genInitCode(m) finishTypeDescriptions(m) if sfMainModule in m.module.flags: # generate main file: add(m.s[cfsProcHeaders], m.g.mainModProcs) generateThreadVarsSize(m) var cf = Cfile(cname: cfile, obj: completeCFilePath(m.config, toObjFile(m.config, cfile)), flags: {}) var code = genModule(m, cf) when hasTinyCBackend: if conf.cmd == cmdRun: tccgen.compileCCode($code) return if not shouldRecompile(m, code, cf): cf.flags = {CfileFlag.Cached} addFileToCompile(m.config, cf) elif pending and mergeRequired(m) and sfMainModule notin m.module.flags: let cf = Cfile(cname: cfile, obj: completeCFilePath(m.config, toObjFile(m.config, cfile)), flags: {}) mergeFiles(cfile, m) genInitCode(m) finishTypeDescriptions(m) var code = genModule(m, cf) if not writeRope(code, cfile): rawMessage(m.config, errCannotOpenFile, cfile) addFileToCompile(m.config, cf) else: # Consider: first compilation compiles ``system.nim`` and produces # ``system.c`` but then compilation fails due to an error. This means # that ``system.o`` is missing, so we need to call the C compiler for it: var cf = Cfile(cname: cfile, obj: completeCFilePath(m.config, toObjFile(m.config, cfile)), flags: {}) if not existsFile(cf.obj): cf.flags = {CfileFlag.Cached} addFileToCompile(m.config, cf) close(m.ndi) proc updateCachedModule(m: BModule) = let cfile = getCFile(m) var cf = Cfile(cname: cfile, obj: completeCFilePath(m.config, toObjFile(m.config, cfile)), flags: {}) if mergeRequired(m) and sfMainModule notin m.module.flags: mergeFiles(cfile, m) genInitCode(m) finishTypeDescriptions(m) var code = genModule(m, cf) if not writeRope(code, cfile): rawMessage(m.config, errCannotOpenFile, cfile) else: cf.flags = {CfileFlag.Cached} addFileToCompile(m.config, cf) proc myClose(graph: ModuleGraph; b: PPassContext, n: PNode): PNode = result = n if b == nil: return var m = BModule(b) if passes.skipCodegen(m.config, n): return # if the module is cached, we don't regenerate the main proc # nor the dispatchers? But if the dispatchers changed? # XXX emit the dispatchers into its own .c file? if n != nil: m.initProc.options = initProcOptions(m) genStmts(m.initProc, n) # cached modules need to registered too: registerModuleToMain(m.g, m.module) if sfMainModule in m.module.flags: if m.g.forwardedProcsCounter == 0: incl m.flags, objHasKidsValid let disp = generateMethodDispatchers(graph) for x in disp: genProcAux(m, x.sym) genMainProc(m) proc cgenWriteModules*(backend: RootRef, config: ConfigRef) = let g = BModuleList(backend) # we need to process the transitive closure because recursive module # deps are allowed (and the system module is processed in the wrong # order anyway) g.config = config if g.generatedHeader != nil: finishModule(g.generatedHeader) while g.forwardedProcsCounter > 0: for m in cgenModules(g): finishModule(m) for m in cgenModules(g): m.writeModule(pending=true) writeMapping(config, g.mapping) if g.generatedHeader != nil: writeHeader(g.generatedHeader) const cgenPass* = makePass(myOpen, myOpenCached, myProcess, myClose)
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2025-05-31 16:23:50 +0000