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
|
<!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 - 046global.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 we have local variables, and we can nest local variables of short</span>
<span class="Comment">//: lifetimes inside longer ones. Now let's support 'global' variables that</span>
<span class="Comment">//: last for the life of a routine. If we create multiple routines they won't</span>
<span class="Comment">//: have access to each other's globals.</span>
<span class="Comment">//:</span>
<span class="Comment">//: This feature is still experimental and half-baked. You can't name global</span>
<span class="Comment">//: variables, and so like in most tests they don't get checked for types (the</span>
<span class="Comment">//: only known hole in the type system, can cause memory corruption). We might</span>
<span class="Comment">//: fix these issues if we ever use globals. Or we might just drop the feature</span>
<span class="Comment">//: entirely.</span>
<span class="Delimiter">:(scenario global_space)</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>
global-space:space<span class="Special"> <- </span>copy <span class="Constant">20</span>/unsafe
<span class="Normal">default</span>-space:space<span class="Special"> <- </span>copy <span class="Constant">10</span>/unsafe
<span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span class="Special">1:num/space:global</span><span class="Special"> <- </span>copy <span class="Constant">24</span>
]
<span class="Comment"># store to default space: 10 + (skip refcount and length) 2 + (index) 1</span>
<span class="traceContains">+mem: storing 23 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 24 in location 23</span>
<span class="Comment">//: to support it, create another special variable called global space</span>
<span class="Delimiter">:(before "End is_disqualified Cases")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">"global-space"</span><span class="Delimiter">)</span>
x<span class="Delimiter">.</span>initialized = <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End is_special_name Cases")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">"global-space"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Comment">//: writes to this variable go to a field in the current routine</span>
<span class="Delimiter">:(before "End routine Fields")</span>
<span class="Normal">int</span> global_space<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
global_space = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Begin Preprocess write_memory(x, data)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">"global-space"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>data<span class="Delimiter">)</span> || !is_space<span class="Delimiter">(</span>x<span class="Delimiter">))</span>
raise << maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"'global-space' should be of type address:array:location, but tried to write '"</span> << to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>global_space<span class="Delimiter">)</span>
raise << <span class="Constant">"routine already has a global-space; you can't over-write your globals"</span> << end<span class="Delimiter">();</span>
Current_routine<span class="Delimiter">-></span>global_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: now marking variables as /space:global looks them up inside this field</span>
<span class="Delimiter">:(after "int space_base(const reagent& x)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>global_space<span class="Delimiter">)</span>
raise << <span class="Constant">"routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> Current_routine<span class="Delimiter">-></span>global_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="Delimiter">}</span>
<span class="Comment">//: for now let's not bother giving global variables names.</span>
<span class="Comment">//: don't want to make them too comfortable to use.</span>
<span class="Delimiter">:(scenario global_space_with_names)</span>
<span class="muRecipe">def</span> main [
global-space:space<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">location:type</span><span class="Delimiter">,</span> <span class="Constant">10</span>
<span class="Normal">x</span>:num<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span class="Special">1:num/space:global</span><span class="Special"> <- </span>copy <span class="Constant">24</span>
]
<span class="Comment"># don't complain about mixing numeric addresses and names</span>
$error: <span class="Constant">0</span>
<span class="Delimiter">:(after "bool is_numeric_location(const reagent& x)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Comment">//: helpers</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">bool</span> is_global<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
string_tree* s = property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">);</span>
<span class="Identifier">return</span> s && s<span class="Delimiter">-></span>atom && s<span class="Delimiter">-></span>value == <span class="Constant">"global"</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|