https://github.com/akkartik/mu/blob/master/052tangle.cc
1
2
3
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5
6
7
8
9 :(before "End is_jump_target Special-cases")
10 if (is_waypoint(label)) return false;
11
12 :(code)
13 bool is_waypoint(string label) {
14 return *label.begin() == '<' && *label.rbegin() == '>';
15 }
16
17 :(scenario tangle_before)
18 def main [
19 1:num <- copy 0
20 <label1>
21 3:num <- copy 0
22 ]
23 before <label1> [
24 2:num <- copy 0
25 ]
26 +mem: storing 0 in location 1
27 +mem: storing 0 in location 2
28 +mem: storing 0 in location 3
29
30 $mem: 3
31
32
33
34 :(before "End Globals")
35 map<string , recipe> Before_fragments, After_fragments;
36 set<string > Fragments_used;
37 :(before "End Reset")
38 Before_fragments.clear();
39 After_fragments.clear();
40 Fragments_used.clear();
41
42 :(before "End Command Handlers")
43 else if (command == "before") {
44 string label = next_word(in);
45 if (label.empty()) {
46 assert(!has_data(in));
47 raise << "incomplete 'before' block at end of file\n" << end();
48 return result;
49 }
50 recipe tmp;
51 slurp_body(in, tmp);
52 if (is_waypoint(label))
53 Before_fragments[label].steps.insert(Before_fragments[label].steps.end(), tmp.steps.begin(), tmp.steps.end());
54 else
55 raise << "can't tangle before non-waypoint " << label << '\n' << end();
56
57 }
58 else if (command == "after") {
59 string label = next_word(in);
60 if (label.empty()) {
61 assert(!has_data(in));
62 raise << "incomplete 'after' block at end of file\n" << end();
63 return result;
64 }
65 recipe tmp;
66 slurp_body(in, tmp);
67 if (is_waypoint(label))
68 After_fragments[label].steps.insert(After_fragments[label].steps.begin(), tmp.steps.begin(), tmp.steps.end());
69 else
70 raise << "can't tangle after non-waypoint " << label << '\n' << end();
71
72 }
73
74
75
76 :(<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<a href='https://github.com/akkartik/mu/blob/master/113write-stream.subx'>https://github.com/akkartik/mu/blob/master/113write-stream.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># write-stream: like write, but write streams rather than strings</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L6" class="LineNr"> 6 </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="L7" class="LineNr"> 7 </span>
<span id="L8" class="LineNr"> 8 </span><span class="CommentedCode">#? Entry: # manual test</span>
<span id="L9" class="LineNr"> 9 </span><span class="CommentedCode">#? # write-stream(stdout, _test-stream2)</span>
<span id="L10" class="LineNr"> 10 </span><span class="CommentedCode">#? 68/push _test-stream2/imm32</span>
<span id="L11" class="LineNr"> 11 </span><span class="CommentedCode">#? 68/push 1/imm32/stdout</span>
<span id="L12" class="LineNr"> 12 </span><span class="CommentedCode">#? e8/call write-stream/disp32</span>
<span id="L13" class="LineNr"> 13 </span><span class="CommentedCode">#? # syscall(exit, Num-test-failures)</span>
<span id="L14" class="LineNr"> 14 </span><span class="CommentedCode">#? 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/ebx Num-test-failures/disp32 # copy *Num-test-failures to ebx</span>
<span id="L15" class="LineNr"> 15 </span><span class="CommentedCode">#? e8/call syscall_exit/disp32</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="subxFunction">write-stream</span>: <span class="subxComment"># f: fd or (addr stream byte), s: (addr stream byte)</span>
<span id="L18" class="LineNr"> 18 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L19" class="LineNr"> 19 </span> 55/push-ebp
<span id="L20" class="LineNr"> 20 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span>
<span id="L21" class="LineNr"> 21 </span> <span class="subxComment"># if (f < 0x08000000) _write-stream(f, s), return # f can't be a user-mode address, so treat it as a kernel file descriptor</span>
<span id="L22" class="LineNr"> 22 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 0x08000000/imm32 <span class="subxComment"># compare *(ebp+8)</span>
<span id="L23" class="LineNr"> 23 </span> 73/jump-if-addr>= $write-stream:fake/disp8
<span id="L24" class="LineNr"> 24 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L25" class="LineNr"> 25 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L26" class="LineNr"> 26 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L27" class="LineNr"> 27 </span> <span class="subxS2Comment"># . . call</span>
<span id="L28" class="LineNr"> 28 </span> e8/call <a href='113write-stream.subx.html#L77'>_write-stream</a>/disp32
<span id="L29" class="LineNr"> 29 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L30" class="LineNr"> 30 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to esp</span>
<span id="L31" class="LineNr"> 31 </span> eb/jump $write-stream:end/disp8
<span id="L32" class="LineNr"> 32 </span><span class="Constant">$write-stream:fake</span>:
<span id="L33" class="LineNr"> 33 </span> <span class="subxComment"># otherwise, treat 'f' as a stream to append to</span>
<span id="L34" class="LineNr"> 34 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L35" class="LineNr"> 35 </span> 50/push-eax
<span id="L36" class="LineNr"> 36 </span> 56/push-esi
<span id="L37" class="LineNr"> 37 </span> 57/push-edi
<span id="L38" class="LineNr"> 38 </span> <span class="subxComment"># edi = f</span>
<span id="L39" class="LineNr"> 39 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 7/r32/edi 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to edi</span>
<span id="L40" class="LineNr"> 40 </span> <span class="subxComment"># esi = s<