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