1 package serp.bytecode;
2
3 import serp.bytecode.visitor.*;
4
5 /***
6 * Loads a value from an array onto the stack.
7 *
8 * @author Abe White
9 */
10 public class ArrayLoadInstruction extends ArrayInstruction {
11 private static final Class[][] _mappings = new Class[][] {
12 { boolean.class, int.class },
13 { void.class, int.class },
14 };
15
16 ArrayLoadInstruction(Code owner) {
17 super(owner);
18 }
19
20 ArrayLoadInstruction(Code owner, int opcode) {
21 super(owner, opcode);
22 }
23
24 public int getLogicalStackChange() {
25 switch (getOpcode()) {
26 case Constants.NOP:
27 return 0;
28 default:
29 return -1;
30 }
31 }
32
33 public int getStackChange() {
34 switch (getOpcode()) {
35 case Constants.DALOAD:
36 case Constants.LALOAD:
37 case Constants.NOP:
38 return 0;
39 default:
40 return -1;
41 }
42 }
43
44 public String getTypeName() {
45 switch (getOpcode()) {
46 case Constants.IALOAD:
47 return int.class.getName();
48 case Constants.LALOAD:
49 return long.class.getName();
50 case Constants.FALOAD:
51 return float.class.getName();
52 case Constants.DALOAD:
53 return double.class.getName();
54 case Constants.AALOAD:
55 return Object.class.getName();
56 case Constants.BALOAD:
57 return byte.class.getName();
58 case Constants.CALOAD:
59 return char.class.getName();
60 case Constants.SALOAD:
61 return short.class.getName();
62 default:
63 return null;
64 }
65 }
66
67 public TypedInstruction setType(String type) {
68 type = mapType(type, _mappings, true);
69 if (type == null)
70 return (TypedInstruction) setOpcode(Constants.NOP);
71
72 switch (type.charAt(0)) {
73 case 'i':
74 return (TypedInstruction) setOpcode(Constants.IALOAD);
75 case 'l':
76 return (TypedInstruction) setOpcode(Constants.LALOAD);
77 case 'f':
78 return (TypedInstruction) setOpcode(Constants.FALOAD);
79 case 'd':
80 return (TypedInstruction) setOpcode(Constants.DALOAD);
81 case 'b':
82 return (TypedInstruction) setOpcode(Constants.BALOAD);
83 case 'c':
84 return (TypedInstruction) setOpcode(Constants.CALOAD);
85 case 's':
86 return (TypedInstruction) setOpcode(Constants.SALOAD);
87 default:
88 return (TypedInstruction) setOpcode(Constants.AALOAD);
89 }
90 }
91
92 public void acceptVisit(BCVisitor visit) {
93 visit.enterArrayLoadInstruction(this);
94 visit.exitArrayLoadInstruction(this);
95 }
96 }