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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
<!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>~/Attic/Repos/mu/mu_instructions.html</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<meta name="settings" content="use_css,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-family: monospace; color: #000000; background-color: #c6c6c6; }
* { font-size: 1em; }
.Comment { color: #005faf; }
.Constant { color: #008787; }
.Special { color: #ff6060; }
.PreProc { color: #c000c0; }
.SalientComment { color: #0000af; }
-->
</style>
</head>
<body>
<pre id='vimCodeElement'>
<span class="SalientComment">## Mu's instructions and their table-driven translation</span>
See <a href="http://akkartik.name/akkartik-convivial-20200315.pdf">http://akkartik.name/akkartik-convivial-20200315.pdf</a> for the complete
story. In brief: Mu is a statement-oriented language. Blocks consist of flat
lists of instructions. Instructions can have inputs after the operation, and
outputs to the left of a '<span class="Special"><-</span>'. Inputs and outputs must be variables. They can't
include nested expressions. Variables can be literals ('n'), or live in a
register ('var/reg') or in memory ('var') at some 'stack-offset' from the 'ebp'
register. Outputs must be registers. To modify a variable in memory, pass it in
by reference as an input. (Inputs are more precisely called 'inouts'.)
Conversely, registers that are just read from must not be passed as inputs.
The following chart shows all the instruction forms supported by Mu, along with
the SubX instruction they're translated to.
var/<span class="Constant">eax</span> <span class="Special"><-</span> increment => <span class="Constant">"40/increment-eax"</span>
var/<span class="Constant">ecx</span> <span class="Special"><-</span> increment => <span class="Constant">"41/increment-ecx"</span>
var/<span class="Constant">edx</span> <span class="Special"><-</span> increment => <span class="Constant">"42/increment-edx"</span>
var/<span class="Constant">ebx</span> <span class="Special"><-</span> increment => <span class="Constant">"43/increment-ebx"</span>
var/<span class="Constant">esi</span> <span class="Special"><-</span> increment => <span class="Constant">"46/increment-esi"</span>
var/<span class="Constant">edi</span> <span class="Special"><-</span> increment => <span class="Constant">"47/increment-edi"</span>
increment var => <span class="Constant">"ff 0/subop/increment *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
increment *var/reg => <span class="Constant">"ff 0/subop/increment *"</span> reg
var/<span class="Constant">eax</span> <span class="Special"><-</span> decrement => <span class="Constant">"48/decrement-eax"</span>
var/<span class="Constant">ecx</span> <span class="Special"><-</span> decrement => <span class="Constant">"49/decrement-ecx"</span>
var/<span class="Constant">edx</span> <span class="Special"><-</span> decrement => <span class="Constant">"4a/decrement-edx"</span>
var/<span class="Constant">ebx</span> <span class="Special"><-</span> decrement => <span class="Constant">"4b/decrement-ebx"</span>
var/<span class="Constant">esi</span> <span class="Special"><-</span> decrement => <span class="Constant">"4e/decrement-esi"</span>
var/<span class="Constant">edi</span> <span class="Special"><-</span> decrement => <span class="Constant">"4f/decrement-edi"</span>
decrement var => <span class="Constant">"ff 1/subop/decrement *(ebp+"</span> var.stack-offset <span class="Constant">")"</span>
decrement *var/reg => <span class="Constant">"ff 1/subop/decrement *"</span> reg
var/reg <span class="Special"><-</span> add var2/reg2 => <span class="Constant">"01/add-to %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> add var2 => <span class="Constant">"03/add *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> add *var2/reg2 => <span class="Constant">"03/add *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
add-to var1, var2/reg => <span class="Constant">"01/add-to *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> add n => <span class="Constant">"05/add-to-eax "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> add n => <span class="Constant">"81 0/subop/add %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
add-to var, n => <span class="Constant">"81 0/subop/add *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
add-to *var/reg, n => <span class="Constant">"81 0/subop/add *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> subtract var2/reg2 => <span class="Constant">"29/subtract-from %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> subtract var2 => <span class="Constant">"2b/subtract *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> subtract *var2/reg2 => <span class="Constant">"2b/subtract *"</span> reg2 <span class="Constant">" "</span> reg1 <span class="Constant">"/r32"</span>
subtract-from var1, var2/reg2 => <span class="Constant">"29/subtract-from *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg2 <span class="Constant">"/r32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> subtract n => <span class="Constant">"2d/subtract-from-eax "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> subtract n => <span class="Constant">"81 5/subop/subtract %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
subtract-from var, n => <span class="Constant">"81 5/subop/subtract *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
subtract-from *var/reg, n => <span class="Constant">"81 5/subop/subtract *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> and var2/reg2 => <span class="Constant">"21/and-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> and var2 => <span class="Constant">"23/and *(ebp+"</span> var2.stack-offset <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> and *var2/reg2 => <span class="Constant">"23/and *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
and-with var1, var2/reg => <span class="Constant">"21/and-with *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> and n => <span class="Constant">"25/and-with-eax "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> and n => <span class="Constant">"81 4/subop/and %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
and-with var, n => <span class="Constant">"81 4/subop/and *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
and-with *var/reg, n => <span class="Constant">"81 4/subop/and *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> or var2/reg2 => <span class="Constant">"09/or-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> or var2 => <span class="Constant">"0b/or *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> or *var2/reg2 => <span class="Constant">"0b/or *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
or-with var1, var2/reg2 => <span class="Constant">"09/or-with *(ebp+"</span> var1.stack-offset <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> or n => <span class="Constant">"0d/or-with-eax "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> or n => <span class="Constant">"81 1/subop/or %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
or-with var, n => <span class="Constant">"81 1/subop/or *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
or-with *var/reg, n => <span class="Constant">"81 1/subop/or *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> xor var2/reg2 => <span class="Constant">"31/xor-with %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> xor var2 => <span class="Constant">"33/xor *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> xor *var2/reg2 => <span class="Constant">"33/xor *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
xor-with var1, var2/reg => <span class="Constant">"31/xor-with *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> xor n => <span class="Constant">"35/xor-with-eax "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> xor n => <span class="Constant">"81 6/subop/xor %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
xor-with var, n => <span class="Constant">"81 6/subop/xor *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
xor-with *var/reg, n => <span class="Constant">"81 6/subop/xor *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">eax</span> <span class="Special"><-</span> copy n => <span class="Constant">"b8/copy-to-eax "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">ecx</span> <span class="Special"><-</span> copy n => <span class="Constant">"b9/copy-to-ecx "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">edx</span> <span class="Special"><-</span> copy n => <span class="Constant">"ba/copy-to-edx "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">ebx</span> <span class="Special"><-</span> copy n => <span class="Constant">"bb/copy-to-ebx "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">esi</span> <span class="Special"><-</span> copy n => <span class="Constant">"be/copy-to-esi "</span> n <span class="Constant">"/imm32"</span>
var/<span class="Constant">edi</span> <span class="Special"><-</span> copy n => <span class="Constant">"bf/copy-to-edi "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> copy var2/reg2 => <span class="Constant">"89/<- %"</span> reg <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
copy-to var1, var2/reg => <span class="Constant">"89/<- *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> copy var2 => <span class="Constant">"8b/-> *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> copy *var2/reg2 => <span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> copy n => <span class="Constant">"c7 0/subop/copy %"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
copy-to var, n => <span class="Constant">"c7 0/subop/copy *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
copy-to *var/reg, n => <span class="Constant">"c7 0/subop/copy *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
compare var1, var2/reg2 => <span class="Constant">"39/compare *(ebp+"</span> var1.stack-offset <span class="Constant">") "</span> reg2 <span class="Constant">"/r32"</span>
compare *var1/reg1, var2/reg2 => <span class="Constant">"39/compare *"</span> reg1 <span class="Constant">" "</span> reg2 <span class="Constant">"/r32"</span>
compare var1/reg1, var2 => <span class="Constant">"3b/compare<- *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg1 <span class="Constant">"/r32"</span>
compare var/reg, *var2/reg2 => <span class="Constant">"3b/compare<- *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
compare var/<span class="Constant">eax</span>, n => <span class="Constant">"3d/compare-eax-with "</span> n <span class="Constant">"/imm32"</span>
compare var, n => <span class="Constant">"81 7/subop/compare *(ebp+"</span> var.stack-offset <span class="Constant">") "</span> n <span class="Constant">"/imm32"</span>
compare *var/reg, n => <span class="Constant">"81 7/subop/compare *"</span> reg <span class="Constant">" "</span> n <span class="Constant">"/imm32"</span>
var/reg <span class="Special"><-</span> multiply var2 => <span class="Constant">"0f af/multiply *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> multiply *var2/reg2 => <span class="Constant">"0f af/multiply *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
<span class="PreProc">break</span> => <span class="Constant">"e9/jump break/disp32"</span>
<span class="PreProc">break</span> label => <span class="Constant">"e9/jump "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop</span> => <span class="Constant">"e9/jump loop/disp32"</span>
<span class="PreProc">loop</span> label => <span class="Constant">"e9/jump "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-=</span> => <span class="Constant">"0f 84/jump-if-= break/disp32"</span>
<span class="PreProc">break-if-=</span> label => <span class="Constant">"0f 84/jump-if-= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-=</span> => <span class="Constant">"0f 84/jump-if-= loop/disp32"</span>
<span class="PreProc">loop-if-=</span> label => <span class="Constant">"0f 84/jump-if-= "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-!=</span> => <span class="Constant">"0f 85/jump-if-!= break/disp32"</span>
<span class="PreProc">break-if-!=</span> label => <span class="Constant">"0f 85/jump-if-!= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-!=</span> => <span class="Constant">"0f 85/jump-if-!= loop/disp32"</span>
<span class="PreProc">loop-if-!=</span> label => <span class="Constant">"0f 85/jump-if-!= "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-<</span> => <span class="Constant">"0f 8c/jump-if-< break/disp32"</span>
<span class="PreProc">break-if-<</span> label => <span class="Constant">"0f 8c/jump-if-< "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-<</span> => <span class="Constant">"0f 8c/jump-if-< loop/disp32"</span>
<span class="PreProc">loop-if-<</span> label => <span class="Constant">"0f 8c/jump-if-< "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-></span> => <span class="Constant">"0f 8f/jump-if-> break/disp32"</span>
<span class="PreProc">break-if-></span> label => <span class="Constant">"0f 8f/jump-if-> "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-></span> => <span class="Constant">"0f 8f/jump-if-> loop/disp32"</span>
<span class="PreProc">loop-if-></span> label => <span class="Constant">"0f 8f/jump-if-> "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-<=</span> => <span class="Constant">"0f 8e/jump-if-<= break/disp32"</span>
<span class="PreProc">break-if-<=</span> label => <span class="Constant">"0f 8e/jump-if-<= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-<=</span> => <span class="Constant">"0f 8e/jump-if-<= loop/disp32"</span>
<span class="PreProc">loop-if-<=</span> label => <span class="Constant">"0f 8e/jump-if-<= "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if->=</span> => <span class="Constant">"0f 8d/jump-if->= break/disp32"</span>
<span class="PreProc">break-if->=</span> label => <span class="Constant">"0f 8d/jump-if->= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if->=</span> => <span class="Constant">"0f 8d/jump-if->= loop/disp32"</span>
<span class="PreProc">loop-if->=</span> label => <span class="Constant">"0f 8d/jump-if->= "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-addr<</span> => <span class="Constant">"0f 82/jump-if-addr< break/disp32"</span>
<span class="PreProc">break-if-addr<</span> label => <span class="Constant">"0f 82/jump-if-addr< "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-addr<</span> => <span class="Constant">"0f 82/jump-if-addr< loop/disp32"</span>
<span class="PreProc">loop-if-addr<</span> label => <span class="Constant">"0f 82/jump-if-addr< "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-addr></span> => <span class="Constant">"0f 87/jump-if-addr> break/disp32"</span>
<span class="PreProc">break-if-addr></span> label => <span class="Constant">"0f 87/jump-if-addr> "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-addr></span> => <span class="Constant">"0f 87/jump-if-addr> loop/disp32"</span>
<span class="PreProc">loop-if-addr></span> label => <span class="Constant">"0f 87/jump-if-addr> "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-addr<=</span> => <span class="Constant">"0f 86/jump-if-addr<= break/disp32"</span>
<span class="PreProc">break-if-addr<=</span> label => <span class="Constant">"0f 86/jump-if-addr<= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-addr<=</span> => <span class="Constant">"0f 86/jump-if-addr<= loop/disp32"</span>
<span class="PreProc">loop-if-addr<=</span> label => <span class="Constant">"0f 86/jump-if-addr<= "</span> label <span class="Constant">":loop/disp32"</span>
<span class="PreProc">break-if-addr>=</span> => <span class="Constant">"0f 83/jump-if-addr>= break/disp32"</span>
<span class="PreProc">break-if-addr>=</span> label => <span class="Constant">"0f 83/jump-if-addr>= "</span> label <span class="Constant">":break/disp32"</span>
<span class="PreProc">loop-if-addr>=</span> => <span class="Constant">"0f 83/jump-if-addr>= loop/disp32"</span>
<span class="PreProc">loop-if-addr>=</span> label => <span class="Constant">"0f 83/jump-if-addr>= "</span> label <span class="Constant">":loop/disp32"</span>
In the following instructions types are provided for clarity even if they must
be provided in an earlier 'var' declaration.
<span class="Comment"># Address operations</span>
var/reg: (addr T) <span class="Special"><-</span> address var2: T
=> <span class="Constant">"8d/copy-address *(ebp+"</span> var2.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
Array operations (TODO: bounds-checking)
var/reg <span class="Special"><-</span> length arr/reg2: (addr array T)
=> <span class="Constant">"8b/-> *"</span> reg2 <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> index arr/rega: (addr array T), idx/regi: int <span class="Comment"># if size(T) is 4 or 8</span>
=> <span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> regi <span class="Constant">"<<"</span> log2(size(T)) <span class="Constant">"+4) "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> index arr: (array T sz), idx/regi: int
=> <span class="Constant">"8d/copy-address *(ebp+"</span> regi <span class="Constant">"<<"</span> log2(size(T)) <span class="Constant">"+"</span> (arr.stack-offset + <span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> index arr/rega: (addr array T), n
=> <span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> (n*size(T)+<span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> index arr: (array T sz), n
=> <span class="Constant">"8d/copy-address *(ebp+"</span> (arr.stack-offset+<span class="Constant">4</span>+n*size(T)) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg: (offset T) <span class="Special"><-</span> compute-offset arr: (addr array T), idx/regi: int <span class="Comment"># arr can be in reg or mem</span>
=> <span class="Constant">"69/multiply %"</span> regi <span class="Constant">" "</span> size(T) <span class="Constant">"/imm32 "</span> reg <span class="Constant">"/r32"</span>
var/reg: (offset T) <span class="Special"><-</span> compute-offset arr: (addr array T), idx: int <span class="Comment"># arr can be in reg or mem</span>
=> <span class="Constant">"69/multiply *(ebp+"</span> idx.stack-offset <span class="Constant">") "</span> size(T) <span class="Constant">"/imm32 "</span> reg <span class="Constant">"/r32"</span>
var/reg <span class="Special"><-</span> index arr/rega: (addr array T), o/rego: offset
=> <span class="Constant">"8d/copy-address *("</span> rega <span class="Constant">"+"</span> rego <span class="Constant">"+4) "</span> reg <span class="Constant">"/r32"</span>
<span class="Comment"># User-defined types</span>
If a record (product) type T was defined to have elements a, b, c, ... of
types T_a, T_b, T_c, ..., then accessing one of those elements f of type T_f:
var/reg: (addr T_f) <span class="Special"><-</span> get var2/reg2: (addr F), f
=> <span class="Constant">"8d/copy-address *("</span> reg2 <span class="Constant">"+"</span> offset(f) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
var/reg: (addr T_f) <span class="Special"><-</span> get var2: (addr F), f
=> <span class="Constant">"8d/copy-address *(ebp+"</span> var2.stack-offset <span class="Constant">"+"</span> offset(f) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
<span class="Comment"># Handles for safe access to the heap</span>
copy-handle-to dest: (handle T), src: (handle T)
=> <span class="Constant">"50/push-eax"</span>
<span class="Constant">"8b/-> *(ebp+"</span> src.stack-offset <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"89/<- *(ebp+"</span> dest.stack-offset <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"8b/-> *(ebp+"</span> src.stack-offset+<span class="Constant">4</span> <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"89/<- *(ebp+"</span> dest.stack-offset+<span class="Constant">4</span> <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"58/pop-to-eax"</span>
copy-handle-to *dest/reg: (addr handle T), src: (handle T)
=> <span class="Constant">"50/push-eax"</span>
<span class="Constant">"8b/-> *(ebp+"</span> src.stack-offset <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"89/<- *"</span> reg <span class="Constant">" 0/r32/eax"</span>
<span class="Constant">"8b/-> *(ebp+"</span> src.stack-offset+<span class="Constant">4</span> <span class="Constant">") 0/r32/eax"</span>
<span class="Constant">"89/<- *("</span> reg <span class="Constant">"+4) 0/r32/eax"</span>
<span class="Constant">"58/pop-to-eax"</span>
out/reg: (addr T) <span class="Special"><-</span> lookup in: (handle T)
=> <span class="Comment"># payload_allocid = in->address->allocid</span>
<span class="Constant">"8b/-> *(epb+"</span> (in.stack-offset+<span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
<span class="Constant">"8b/-> *"</span> reg <span class="Constant">" "</span> reg <span class="Constant">"/r32"</span>
<span class="Comment"># if (payload_allocid != handle->allocid) abort</span>
<span class="Constant">"39/compare *(ebp+"</span> in.stack-offset <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
<span class="Constant">"0f 85/jump-if-!= $lookup:abort/disp32"</span>
<span class="Comment"># return payload</span>
<span class="Constant">"8b/-> *(epb+"</span> (in.stack-offset+<span class="Constant">4</span>) <span class="Constant">") "</span> reg <span class="Constant">"/r32"</span>
<span class="Constant">"81 0/subop/add %"</span> reg <span class="Constant">" 4/imm32"</span> <span class="Comment"># skip payload->allocid</span>
vim:ft=mu:nowrap:textwidth=<span class="Constant">0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|