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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
<!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 - 033exclusive_container.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; }
.cSpecial { color: #008000; }
.SalientComment { color: #00ffff; }
.traceContains { color: #008000; }
.Comment { color: #9090ff; }
.Delimiter { color: #a04060; }
.Special { color: #ff6060; }
.Identifier { color: #804000; }
.Constant { color: #00a0a0; }
-->
</style>
<script type='text/javascript'>
<!--
-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">//: Exclusive containers contain exactly one of a fixed number of 'variants'</span>
<span class="Comment">//: of different types.</span>
<span class="Comment">//:</span>
<span class="Comment">//: They also implicitly contain a tag describing precisely which variant is</span>
<span class="Comment">//: currently stored in them.</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
<span class="Comment">//: We'll use this container as a running example, with two number elements.</span>
<span class="Delimiter">{</span>
type_ordinal tmp = Type_ordinal[<span class="Constant">"number-or-point"</span>] = Next_type_ordinal++<span class="Delimiter">;</span>
Type[tmp]<span class="Delimiter">.</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
Type[tmp]<span class="Delimiter">.</span>kind = exclusive_container<span class="Delimiter">;</span>
Type[tmp]<span class="Delimiter">.</span>name = <span class="Constant">"number-or-point"</span><span class="Delimiter">;</span>
vector<type_ordinal> t1<span class="Delimiter">;</span>
t1<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>number<span class="Delimiter">);</span>
Type[tmp]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>t1<span class="Delimiter">);</span>
vector<type_ordinal> t2<span class="Delimiter">;</span>
t2<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>point<span class="Delimiter">);</span>
Type[tmp]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>t2<span class="Delimiter">);</span>
Type[tmp]<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">"i"</span><span class="Delimiter">);</span>
Type[tmp]<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">"p"</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Tests in this layer often explicitly setup memory before reading it as an</span>
<span class="Comment">//: array. Don't do this in general. I'm tagging exceptions with /raw to</span>
<span class="Comment">//: avoid warnings.</span>
<span class="Delimiter">:(scenario copy_exclusive_container)</span>
<span class="Comment"># Copying exclusive containers copies all their contents and an extra location for the tag.</span>
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span> <span class="Comment"># 'point' variant</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">4</span>:number-or-point<span class="Special"> <- </span>copy <span class="Constant">1</span>:number-or-point/<span class="Special">raw</span> <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 1 in location 4</span>
<span class="traceContains">+mem: storing 34 in location 5</span>
<span class="traceContains">+mem: storing 35 in location 6</span>
<span class="Delimiter">:(before "End size_of(types) Cases")</span>
if <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == exclusive_container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// size of an exclusive container is the size of its largest variant</span>
<span class="Comment">// (So like containers, it can't contain arrays.)</span>
long long int result = <span class="Constant">0</span><span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < t<span class="Delimiter">.</span>size<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
long long int tmp = size_of<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
if <span class="Delimiter">(</span>tmp > result<span class="Delimiter">)</span> result = tmp<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// ...+1 for its tag.</span>
<span class="Identifier">return</span> result+<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: To access variants of an exclusive container, use 'maybe-convert'.</span>
<span class="Comment">//: It always returns an address (so that you can modify it) or null (to</span>
<span class="Comment">//: signal that the conversion failed (because the container contains a</span>
<span class="Comment">//: different variant).</span>
<span class="Comment">//: 'maybe-convert' requires a literal in ingredient 1. We'll use a synonym</span>
<span class="Comment">//: called 'variant'.</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
Type_ordinal[<span class="Constant">"variant"</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(scenario maybe_convert)</span>
recipe main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">20</span>:address:point<span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-or-point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:variant <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 13 in location 20</span>
<span class="Delimiter">:(scenario maybe_convert_fail)</span>
recipe main [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>
<span class="Constant">13</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">14</span>:number<span class="Special"> <- </span>copy <span class="Constant">36</span>
<span class="Constant">20</span>:address:point<span class="Special"> <- </span>maybe-convert <span class="Constant">12</span>:number-or-point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">0</span>:variant <span class="Comment"># unsafe</span>
]
<span class="traceContains">+mem: storing 0 in location 20</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
MAYBE_CONVERT<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"maybe-convert"</span>] = MAYBE_CONVERT<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case MAYBE_CONVERT: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'maybe-convert' expects exactly 2 ingredients in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
reagent base = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": tried to access location 0 in '"</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || Type[base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span>kind != exclusive_container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name <span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'maybe-convert' should be an exclusive-container, but got "</span> << base<span class="Delimiter">.</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": second ingredient of 'maybe-convert' should have type 'variant', but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
long long int tag = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">;</span>
long long int result<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>tag == static_cast<long long int><span class="Delimiter">(</span>Memory[base_address]<span class="Delimiter">))</span> <span class="Delimiter">{</span>
result = base_address+<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: Allow exclusive containers to be defined in mu code.</span>
<span class="Delimiter">:(scenario exclusive_container)</span>
exclusive-container foo [
x:number
y:number
]
<span class="traceContains">+parse: reading exclusive-container foo</span>
<span class="traceContains">+parse: element name: x</span>
<span class="traceContains">+parse: type: 1</span>
<span class="traceContains">+parse: element name: y</span>
<span class="traceContains">+parse: type: 1</span>
<span class="Delimiter">:(before "End Command Handlers")</span>
else if <span class="Delimiter">(</span>command == <span class="Constant">"exclusive-container"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
insert_container<span class="Delimiter">(</span>command<span class="Delimiter">,</span> exclusive_container<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: To construct exclusive containers out of variant types, use 'merge'.</span>
<span class="Delimiter">:(scenario lift_to_exclusive_container)</span>
exclusive-container foo [
x:number
y:number
]
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">2</span>:foo<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">1</span>:number
<span class="Constant">4</span>:foo<span class="Special"> <- </span>merge <span class="Constant">1</span>/x<span class="Delimiter">,</span> <span class="Constant">1</span>:number
]
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="traceContains">+mem: storing 34 in location 3</span>
<span class="traceContains">+mem: storing 1 in location 4</span>
<span class="traceContains">+mem: storing 34 in location 5</span>
<span class="Comment">//: Since the different variants of an exclusive-container might have</span>
<span class="Comment">//: different sizes, relax the size mismatch check for 'merge' instructions.</span>
<span class="Delimiter">:(before "End size_mismatch(x) Cases")</span>
if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation == MERGE
&& !current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
&& !current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
reagent x = canonize<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
if <span class="Delimiter">(</span>Type[x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span>kind == exclusive_container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> < SIZE<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario merge_exclusive_container_with_mismatched_sizes)</span>
container foo [
x:number
y:number
]
exclusive-container bar [
x:number
y:foo
]
recipe main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span class="Constant">3</span>:bar<span class="Special"> <- </span>merge <span class="Constant">0</span>/x<span class="Delimiter">,</span> <span class="Constant">1</span>:number
<span class="Constant">6</span>:bar<span class="Special"> <- </span>merge <span class="Constant">1</span>/foo<span class="Delimiter">,</span> <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number
]
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="traceContains">+mem: storing 34 in location 4</span>
<span class="Comment"># bar is always 3 large so location 5 is skipped</span>
<span class="traceContains">+mem: storing 1 in location 6</span>
<span class="traceContains">+mem: storing 34 in location 7</span>
<span class="traceContains">+mem: storing 35 in location 8</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|