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
|
<!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 - subx/054string_equal.subx</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { font-family: monospace; color: #aaaaaa; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; }
a { color:#eeeeee; text-decoration: none; }
a:hover { text-decoration: underline; }
* { font-size: 12pt; font-size: 1em; }
.LineNr { color: #444444; }
.Delimiter { color: #800080; }
.Comment { color: #9090ff; }
.Comment a { color:#0000ee; text-decoration:underline; }
.SalientComment { color: #00ffff; }
-->
</style>
<script type='text/javascript'>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Comparing 'regular' length-prefixed strings.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment"># instruction effective address operand displacement immediate</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># op subop mod rm32 base index scale r32</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment"># main: (manual test if this is the last file loaded)</span>
<span id="L10" class="LineNr"> 10 </span> e8/call run-tests/disp32 <span class="Comment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Comment"># exit(Num-test-failures)</span>
<span id="L12" class="LineNr"> 12 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/r32/EBX Num-test-failures/disp32 <span class="Comment"># copy *Num-test-failures to EBX</span>
<span id="L13" class="LineNr"> 13 </span> b8/copy-to-EAX 1/imm32
<span id="L14" class="LineNr"> 14 </span> cd/syscall 0x80/imm8
<span id="L15" class="LineNr"> 15 </span>
<span id="L16" class="LineNr"> 16 </span>string-equal: <span class="Comment"># s : string, benchmark : string -> EAX : boolean</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Comment"># prolog</span>
<span id="L18" class="LineNr"> 18 </span> 55/push-EBP
<span id="L19" class="LineNr"> 19 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Comment"># save registers</span>
<span id="L21" class="LineNr"> 21 </span> 51/push-ECX
<span id="L22" class="LineNr"> 22 </span> 52/push-EDX
<span id="L23" class="LineNr"> 23 </span> 53/push-EBX
<span id="L24" class="LineNr"> 24 </span> 56/push-ESI
<span id="L25" class="LineNr"> 25 </span> <span class="Comment"># pseudocode:</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Comment"># if s.length != b.length return false</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Comment"># for i = 0; i < s.length; ++i</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Comment"># if s[i] != b[i] return false</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Comment"># return true</span>
<span id="L30" class="LineNr"> 30 </span> <span class="Comment"># registers:</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Comment"># i: ECX</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Comment"># s.length: EDX</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Comment"># b.length: EBX</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Comment"># b[i]: EBX</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Comment"># s[i]: EAX</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Comment">#</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Comment"># var s/EAX : (address array byte)</span>
<span id="L38" class="LineNr"> 38 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to EAX</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Comment"># var benchmark/EBX : (address array byte)</span>
<span id="L40" class="LineNr"> 40 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> 3/r32/EBX 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+12) to EBX</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Comment"># if s.length != b.length return false</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Comment"># EDX = s.length</span>
<span id="L43" class="LineNr"> 43 </span> 8b/copy 0/mod/indirect 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *EAX to EDX</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Comment"># compare s.length and b.length</span>
<span id="L45" class="LineNr"> 45 </span> 39/compare 0/mod/indirect 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># compare *EBX with EDX</span>
<span id="L46" class="LineNr"> 46 </span> 75/jump-if-not-equal $string-equal:false/disp8
<span id="L47" class="LineNr"> 47 </span>$string-equal:lengths:
<span id="L48" class="LineNr"> 48 </span> <span class="Comment"># var i/ECX : int = 0</span>
<span id="L49" class="LineNr"> 49 </span> b9/copy-to-ECX 0/imm32
<span id="L50" class="LineNr"> 50 </span> <span class="Comment"># EBX = &b[i]</span>
<span id="L51" class="LineNr"> 51 </span> 43/inc-EBX
<span id="L52" class="LineNr"> 52 </span> <span class="Comment"># EAX = &s[i]</span>
<span id="L53" class="LineNr"> 53 </span> 40/inc-EAX
<span id="L54" class="LineNr"> 54 </span>$string-equal:loop:
<span id="L55" class="LineNr"> 55 </span> <span class="Comment"># if i >= s.length return true</span>
<span id="L56" class="LineNr"> 56 </span> 39/compare 3/mod/direct 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># compare ECX with EDX</span>
<span id="L57" class="LineNr"> 57 </span> 7d/jump-if-greater-or-equal $string-equal:true/disp8
<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># if b[i] != s[i] return false</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Comment"># ESI = s[i]</span>
<span id="L60" class="LineNr"> 60 </span> 8b/copy 0/mod/indirect 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 6/r32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *EAX to ESI</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Comment"># compare b[i] with ESI</span>
<span id="L62" class="LineNr"> 62 </span> 39/compare 0/mod/indirect 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 6/r32/ESI <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># compare *EBX with ESI</span>
<span id="L63" class="LineNr"> 63 </span> 75/jump-if-not-equal $string-equal:false/disp8
<span id="L64" class="LineNr"> 64 </span> <span class="Comment"># ++i</span>
<span id="L65" class="LineNr"> 65 </span> 41/inc-ECX
<span id="L66" class="LineNr"> 66 </span> 40/inc-EAX
<span id="L67" class="LineNr"> 67 </span> 43/inc-EBX
<span id="L68" class="LineNr"> 68 </span> <span class="Comment"># loop</span>
<span id="L69" class="LineNr"> 69 </span> eb/jump $string-equal:loop/disp8
<span id="L70" class="LineNr"> 70 </span>$string-equal:true:
<span id="L71" class="LineNr"> 71 </span> <span class="Comment"># return true</span>
<span id="L72" class="LineNr"> 72 </span> b8/copy-to-EAX 1/imm32
<span id="L73" class="LineNr"> 73 </span> eb/jump $string-equal:end/disp8
<span id="L74" class="LineNr"> 74 </span>$string-equal:false:
<span id="L75" class="LineNr"> 75 </span> <span class="Comment"># return false</span>
<span id="L76" class="LineNr"> 76 </span> b8/copy-to-EAX 0/imm32
<span id="L77" class="LineNr"> 77 </span>$string-equal:end:
<span id="L78" class="LineNr"> 78 </span> <span class="Comment"># restore registers</span>
<span id="L79" class="LineNr"> 79 </span> 5e/pop-to-ESI
<span id="L80" class="LineNr"> 80 </span> 5b/pop-to-EBX
<span id="L81" class="LineNr"> 81 </span> 5a/pop-to-EDX
<span id="L82" class="LineNr"> 82 </span> 59/pop-to-ECX
<span id="L83" class="LineNr"> 83 </span> <span class="Comment"># epilog</span>
<span id="L84" class="LineNr"> 84 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span>
<span id="L85" class="LineNr"> 85 </span> 5d/pop-to-EBP
<span id="L86" class="LineNr"> 86 </span> c3/return
<span id="L87" class="LineNr"> 87 </span>
<span id="L88" class="LineNr"> 88 </span><span class="SalientComment">## tests</span>
<span id="L89" class="LineNr"> 89 </span>
<span id="L90" class="LineNr"> 90 </span>test-compare-empty-with-empty-string:
<span id="L91" class="LineNr"> 91 </span> <span class="Comment"># EAX = string-equal("", "")</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Comment"># push args</span>
<span id="L93" class="LineNr"> 93 </span> 68/push ""/imm32
<span id="L94" class="LineNr"> 94 </span> 68/push ""/imm32
<span id="L95" class="LineNr"> 95 </span> <span class="Comment"># call</span>
<span id="L96" class="LineNr"> 96 </span> e8/call string-equal/disp32
<span id="L97" class="LineNr"> 97 </span> <span class="Comment"># discard args</span>
<span id="L98" class="LineNr"> 98 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Comment"># call check-ints-equal(EAX, 1, msg)</span>
<span id="L100" class="LineNr">100 </span> <span class="Comment"># push args</span>
<span id="L101" class="LineNr">101 </span> 68/push "F - test-compare-empty-with-empty-string"/imm32
<span id="L102" class="LineNr">102 </span> 68/push 1/imm32/true
<span id="L103" class="LineNr">103 </span> 50/push-EAX
<span id="L104" class="LineNr">104 </span> <span class="Comment"># call</span>
<span id="L105" class="LineNr">105 </span> e8/call check-ints-equal/disp32
<span id="L106" class="LineNr">106 </span> <span class="Comment"># discard args</span>
<span id="L107" class="LineNr">107 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L108" class="LineNr">108 </span> c3/return
<span id="L109" class="LineNr">109 </span>
<span id="L110" class="LineNr">110 </span>test-compare-empty-with-non-empty-string: <span class="Comment"># also checks length-mismatch code path</span>
<span id="L111" class="LineNr">111 </span> <span class="Comment"># EAX = string-equal("", "Abc")</span>
<span id="L112" class="LineNr">112 </span> <span class="Comment"># push args</span>
<span id="L113" class="LineNr">113 </span> 68/push "Abc"/imm32
<span id="L114" class="LineNr">114 </span> 68/push ""/imm32
<span id="L115" class="LineNr">115 </span> <span class="Comment"># call</span>
<span id="L116" class="LineNr">116 </span> e8/call string-equal/disp32
<span id="L117" class="LineNr">117 </span> <span class="Comment"># discard args</span>
<span id="L118" class="LineNr">118 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L119" class="LineNr">119 </span> <span class="Comment"># call check-ints-equal(EAX, 0, msg)</span>
<span id="L120" class="LineNr">120 </span> <span class="Comment"># push args</span>
<span id="L121" class="LineNr">121 </span> 68/push "F - test-compare-empty-with-non-empty-string"/imm32
<span id="L122" class="LineNr">122 </span> 68/push 0/imm32/false
<span id="L123" class="LineNr">123 </span> 50/push-EAX
<span id="L124" class="LineNr">124 </span> <span class="Comment"># call</span>
<span id="L125" class="LineNr">125 </span> e8/call check-ints-equal/disp32
<span id="L126" class="LineNr">126 </span> <span class="Comment"># discard args</span>
<span id="L127" class="LineNr">127 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L128" class="LineNr">128 </span> c3/return
<span id="L129" class="LineNr">129 </span>
<span id="L130" class="LineNr">130 </span>test-compare-equal-strings:
<span id="L131" class="LineNr">131 </span> <span class="Comment"># EAX = string-equal("Abc", "Abc")</span>
<span id="L132" class="LineNr">132 </span> <span class="Comment"># push args</span>
<span id="L133" class="LineNr">133 </span> 68/push "Abc"/imm32
<span id="L134" class="LineNr">134 </span> 68/push "Abc"/imm32
<span id="L135" class="LineNr">135 </span> <span class="Comment"># call</span>
<span id="L136" class="LineNr">136 </span> e8/call string-equal/disp32
<span id="L137" class="LineNr">137 </span> <span class="Comment"># discard args</span>
<span id="L138" class="LineNr">138 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L139" class="LineNr">139 </span> <span class="Comment"># call check-ints-equal(EAX, 1, msg)</span>
<span id="L140" class="LineNr">140 </span> <span class="Comment"># push args</span>
<span id="L141" class="LineNr">141 </span> 68/push "F - test-compare-equal-strings"/imm32
<span id="L142" class="LineNr">142 </span> 68/push 1/imm32/true
<span id="L143" class="LineNr">143 </span> 50/push-EAX
<span id="L144" class="LineNr">144 </span> <span class="Comment"># call</span>
<span id="L145" class="LineNr">145 </span> e8/call check-ints-equal/disp32
<span id="L146" class="LineNr">146 </span> <span class="Comment"># discard args</span>
<span id="L147" class="LineNr">147 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L148" class="LineNr">148 </span> c3/return
<span id="L149" class="LineNr">149 </span>
<span id="L150" class="LineNr">150 </span>test-compare-inequal-strings-equal-lengths:
<span id="L151" class="LineNr">151 </span> <span class="Comment"># EAX = string-equal("Abc", "Adc")</span>
<span id="L152" class="LineNr">152 </span> <span class="Comment"># push args</span>
<span id="L153" class="LineNr">153 </span> 68/push "Adc"/imm32
<span id="L154" class="LineNr">154 </span> 68/push "Abc"/imm32
<span id="L155" class="LineNr">155 </span> <span class="Comment"># call</span>
<span id="L156" class="LineNr">156 </span> e8/call string-equal/disp32
<span id="L157" class="LineNr">157 </span> <span class="Comment"># discard args</span>
<span id="L158" class="LineNr">158 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span>
<span id="L159" class="LineNr">159 </span> <span class="Comment"># call check-ints-equal(EAX, 0, msg)</span>
<span id="L160" class="LineNr">160 </span> <span class="Comment"># push args</span>
<span id="L161" class="LineNr">161 </span> 68/push "F - test-compare-inequal-strings-equal-lengths"/imm32
<span id="L162" class="LineNr">162 </span> 68/push 0/imm32/false
<span id="L163" class="LineNr">163 </span> 50/push-EAX
<span id="L164" class="LineNr">164 </span> <span class="Comment"># call</span>
<span id="L165" class="LineNr">165 </span> e8/call check-ints-equal/disp32
<span id="L166" class="LineNr">166 </span> <span class="Comment"># discard args</span>
<span id="L167" class="LineNr">167 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span>
<span id="L168" class="LineNr">168 </span> c3/return
<span id="L169" class="LineNr">169 </span>
<span id="L170" class="LineNr">170 </span><span class="Comment"># vim:nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|