1 package serp.bytecode;
2
3 import serp.bytecode.visitor.*;
4
5 /***
6 * Stores a value from the stack into a field.
7 *
8 * @author Abe White
9 */
10 public class PutFieldInstruction extends FieldInstruction {
11 PutFieldInstruction(Code owner, int opcode) {
12 super(owner, opcode);
13 }
14
15 public int getLogicalStackChange() {
16 if (getFieldTypeName() == null)
17 return 0;
18 if (getOpcode() == Constants.PUTSTATIC)
19 return -1;
20 return -2;
21 }
22
23 public int getStackChange() {
24 String type = getFieldTypeName();
25 if (type == null)
26 return 0;
27
28 int stack = -2;
29 if (long.class.getName().equals(type)
30 || double.class.getName().equals(type))
31 stack++;
32 if (getOpcode() == Constants.PUTSTATIC)
33 stack++;
34 return stack;
35 }
36
37 public void acceptVisit(BCVisitor visit) {
38 visit.enterPutFieldInstruction(this);
39 visit.exitPutFieldInstruction(this);
40 }
41 }