about summary refs log tree commit diff stats
path: root/html/041jump_label.cc.html
blob: 3ab513f45111a8859d260ffe162ba02537e5d261 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 041jump_label.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v1">
<meta name="syntax" content="cpp">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 1.05em; }
.traceContains { color: #008000; }
.traceAbsent { color: #c00000; }
.Constant { color: #00a0a0; }
.cSpecial { color: #008000; }
.CommentedCode { color: #6c6c6c; }
.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
.Comment { color: #9090ff; }
.Delimiter { color: #a04060; }
.Special { color: #ff6060; }
.Identifier { color: #804000; }
-->
</style>

<script type='text/javascript'>
<!--

-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">//: Support jumps to labels.</span>
<span class="Comment">//: We'll also treat 'break' and 'loop' as jumps. The choice of name is</span>
<span class="Comment">//: just documentation about intent; use 'break' to indicate you're exiting</span>
<span class="Comment">//: one or more loop nests, and 'loop' to indicate you're skipping to the next</span>
<span class="Comment">//: iteration of some containing loop nest.</span>

<span class="Delimiter">:(scenario jump_to_label)</span>
recipe main [
  jump +target:label
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
Type_ordinal[<span class="Constant">&quot;label&quot;</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>

<span class="Delimiter">:(after &quot;int main&quot;)</span>
  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_labels<span class="Delimiter">);</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> transform_labels<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  map&lt;string<span class="Delimiter">,</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt; offset<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">const</span> instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> offset[inst<span class="Delimiter">.</span>label] = i<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;jump&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;jump-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;jump-unless&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;loop&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;break&quot;</span>]<span class="Delimiter">)</span>
        &amp;&amp; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;loop-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;loop-unless&quot;</span>]
            || inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;break-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_ordinal[<span class="Constant">&quot;break-unless&quot;</span>]<span class="Delimiter">)</span>
        &amp;&amp; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> replace_offset<span class="Delimiter">(</span>reagent&amp; x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;&amp; offset<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> current_offset<span class="Delimiter">,</span> <span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: jump target must be offset or label but is &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  assert<span class="Delimiter">(</span>!x<span class="Delimiter">.</span>initialized<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// non-labels will be handled like other number operands</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>offset<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == offset<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
    raise &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: can't find label &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
  x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>offset[x<span class="Delimiter">.</span>name]-current_offset<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario break_to_label)</span>
recipe main [
<span class="CommentedCode">#?   $print [aaa]</span>
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      <span class="Identifier">break</span> +target:label
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario jump_if_to_label)</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      jump-<span class="Normal">if</span> <span class="Constant">1</span><span class="Delimiter">,</span> +target:label
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario loop_unless_to_label)</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      loop-unless <span class="Constant">0</span><span class="Delimiter">,</span> +target:label  <span class="Comment"># loop/break with a label don't care about braces</span>
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario jump_runs_code_after_label)</span>
recipe main [
  <span class="Comment"># first a few lines of padding to exercise the offset computation</span>
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  jump +target:label
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  +target
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+mem: storing 0 in location 5</span>
<span class="traceAbsent">-mem: storing 0 in location 4</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->