CSC431/Instruction.java at master · sennpy/CSC431 · GitHub

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
import java.util.ArrayList;

public class Instruction
{
   private String inst;
   private String arg1;
   private String arg2;
   private String offset = "-1";
   private boolean first;

   public Instruction(String inst, String arg1, String arg2, String offset, boolean first)
   {
      this.inst = inst;
      this.arg1 = arg1;
      this.arg2 = arg2;
      this.offset = offset;
      this.first = first;
   }
   public Instruction(String inst, String arg1, String arg2)
   {
      this.inst = inst;
      this.arg1 = arg1;
      this.arg2 = arg2;
   }

   public Instruction(String inst, String arg1)
   {
      this.inst = inst;
      this.arg1 = arg1;
      arg2 = "";
   }

   public Instruction(String inst)
   {
      this.inst = inst;
      arg1 = arg2 = "";
   }

   public String getInst()
   {
      return inst;
   }

   public String arg1()
   {
      return arg1;
   }

   public String arg2()
   {
      return arg2;
   }

   public boolean uselessMove()
   {
      if (arg1.equals(arg2) && offset.equals("-1") && inst.equals("movq"))
        return true;
      return false;
   }

   public ArrayList<String> getSource()
   {
      ArrayList<String> ret = new ArrayList<String>();

      switch (inst)
      {
        case "call":
           break;

        case "ret":
        case "je":
        case "jne":
        case "jmp":
           break;

        case "cmp":
           if (arg1.charAt(0) != '$')
              ret.add(arg1);
           if (arg2.charAt(0) != '$')
              ret.add(arg2);
           break;

        case "cmovl":
        case "cmovle":
        case "cmovg":
        case "cmovge":
        case "cmove":
        case "cmovne":
        case "addq":
        case "subq":
        case "imulq":
        case "or":
        case "and":
           ret.add(arg1);
           ret.add(arg2);
           break;

         case "movq":
           if (!offset.equals("-1") && !first) {
             if (arg1.charAt(0) != '$')
               ret.add(arg1);
             ret.add(arg2);
             break;
           }

        default:
           if (!arg1.isEmpty() && arg1.charAt(0) != '$' && !arg1.equals("$scan") && !arg1.contains("scanVar") && !arg1.equals("$print"))
              ret.add(arg1);
      }

      return ret;
   }

   public ArrayList<String> getTarget()
   {
      ArrayList<String> ret = new ArrayList<String>();

      switch (inst)
      {
        case "call":
           ret.add("%rax");
           ret.add("%rdx");
           ret.add("%rcx");
           ret.add("%rsi");
           ret.add("%rdi");
           ret.add("%r8");
           ret.add("%r9");
           ret.add("%r10");
           ret.add("%r11");
           break;

        case "ret":
        case "je":
        case "jne":
        case "jmp":
        case "cmp":
           break;

        case "idivq":
           ret.add("%rax");
           ret.add("%rdx");
           break;

        case "neg":
           ret.add(arg1);
           break;

        case "movq":
           if (!offset.equals("-1") && !first) {
             break;
           }

        default:
           if (!arg2.isEmpty() && !arg2.equals("$scan") && !arg2.contains("scanVar") && !arg2.equals("$print"))
              ret.add(arg2);
      }

      return ret;
   }

   public void setArg1(String source)
   {
      arg1 = source;
   }

   public void setArg2(String target)
   {
      arg2 = target;
   }

   public String getArg1()
   {
      return arg1;
   }

   public String getArg2()
   {
      return arg2;
   }

   public boolean KeepInstruction()
   {
      switch (inst)
      {
         case "jmp":
         case "call":
         case "ret":
         case "cmp":
         case "je":
         case "jne":
            return true;

         default:
            for (String target : getTarget())
               if (target.contains("%"))
                  return true;
            return inst.contains(":") || !offset.equals("-1");
      }
   }

   @Override
   public String toString()
   {
      String ret = inst;
      if (offset.equals("-1"))
      {
         if (!arg1.isEmpty())
            ret += " " + arg1;
         if (!arg2.isEmpty())
            ret += ", " + arg2;
      }
      else
      {
         if (first)
            ret += " " + (offset.equals("0") ? "" : offset) +"(" + arg1 + "), " + arg2;
         else
            ret += " " + arg1 + ", " + (offset.equals("0") ? "" : offset) + "(" + arg2 + ")";
      }
      return ret;
   }
}