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
|
<!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 - 044space_surround.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
<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-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 12pt; font-size: 1em; }
.Constant { color: #00a0a0; }
.cSpecial { color: #008000; }
.muRecipe { color: #ff8700; }
.Comment { color: #9090ff; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.traceContains { color: #008000; }
.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
.Identifier { color: #c0a020; }
-->
</style>
<script type='text/javascript'>
<!--
-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">//: So far you can have global variables by not setting default-space, and</span>
<span class="Comment">//: local variables by setting default-space. You can isolate variables</span>
<span class="Comment">//: between those extremes by creating 'surrounding' spaces.</span>
<span class="Comment">//:</span>
<span class="Comment">//: (Surrounding spaces are like lexical scopes in other languages.)</span>
<span class="Delimiter">:(scenario surrounding_space)</span>
<span class="Comment"># location 1 in space 1 refers to the space surrounding the default space, here 20.</span>
<span class="muRecipe">def</span> main [
<span class="Comment"># pretend address:array:location; in practice we'll use new</span>
<span class="Constant">10</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Comment"># refcount</span>
<span class="Constant">11</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span class="Comment"># pretend address:array:location; in practice we'll use new</span>
<span class="Constant">20</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Comment"># refcount</span>
<span class="Constant">21</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span class="Comment"># actual start of this recipe</span>
<span class="Normal">default</span>-space:space<span class="Special"> <- </span>copy <span class="Constant">10</span>/unsafe
<span class="Constant">0</span>:space/names:dummy<span class="Special"> <- </span>copy <span class="Constant">20</span>/unsafe <span class="Comment"># later layers will explain the /names: property</span>
<span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">32</span>
<span class="Constant">1</span>:num/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">33</span>
]
<span class="muRecipe">def</span> dummy [ <span class="Comment"># just for the /names: property above</span>
]
<span class="Comment"># chain space: 10 + (refcount and length) 2</span>
<span class="traceContains">+mem: storing 20 in location 12</span>
<span class="Comment"># store to default space: 10 + (skip refcount and length) 2 + (index) 1</span>
<span class="traceContains">+mem: storing 32 in location 13</span>
<span class="Comment"># store to chained space: (contents of location 12) 20 + (refcount and length) 2 + (index) 1</span>
<span class="traceContains">+mem: storing 33 in location 23</span>
<span class="Delimiter">:(before "End Checks For Reclaiming Locals")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>space_index<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> > <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Comment">//: If you think of a space as a collection of variables with a common</span>
<span class="Comment">//: lifetime, surrounding allows managing shorter lifetimes inside a longer</span>
<span class="Comment">//: one.</span>
<span class="Delimiter">:(replace{} "int space_base(const reagent& x)")</span>
<span class="Normal">int</span> space_base<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">int</span> base = current_call<span class="Delimiter">().</span>default_space ? <span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>default_space+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">)</span> : <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Identifier">return</span> space_base<span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index<span class="Delimiter">(</span>x<span class="Delimiter">),</span> base<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">int</span> space_base<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">,</span> <span class="Normal">int</span> space_index<span class="Delimiter">,</span> <span class="Normal">int</span> base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>space_index == <span class="Constant">0</span><span class="Delimiter">)</span>
<span class="Identifier">return</span> base<span class="Delimiter">;</span>
<span class="Normal">int</span> result = space_base<span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index-<span class="Constant">1</span><span class="Delimiter">,</span> get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">))</span>+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">int</span> space_index<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">"space"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second || x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-></span>right<span class="Delimiter">)</span>
raise << maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"/space metadata should take exactly one value in '"</span> << x<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> to_integer<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario permit_space_as_variable_name)</span>
<span class="muRecipe">def</span> main [
<span class="Normal">space</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|