01: //
02: // Copyright (C) 2005 United States Government as represented by the
03: // Administrator of the National Aeronautics and Space Administration
04: // (NASA). All Rights Reserved.
05: //
06: // This software is distributed under the NASA Open Source Agreement
07: // (NOSA), version 1.3. The NOSA has been approved by the Open Source
08: // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
09: // directory tree for the complete NOSA document.
10: //
11: // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12: // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13: // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14: // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15: // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16: // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17: // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18: //
19: package gov.nasa.jpf.jvm.bytecode;
20:
21: import gov.nasa.jpf.jvm.KernelState;
22: import gov.nasa.jpf.jvm.SystemState;
23: import gov.nasa.jpf.jvm.ThreadInfo;
24: import gov.nasa.jpf.jvm.Types;
25:
26: import org.apache.bcel.classfile.ConstantPool;
27:
28: /**
29: * Compare float
30: * ..., value1, value2 => ..., result
31: */
32: public class FCMPG extends Instruction {
33: public void setPeer(org.apache.bcel.generic.Instruction i,
34: ConstantPool cp) {
35: }
36:
37: public Instruction execute(SystemState ss, KernelState ks,
38: ThreadInfo th) {
39: float v1 = Types.intToFloat(th.pop());
40: float v2 = Types.intToFloat(th.pop());
41:
42: if (!th.getVM().checkNaNcompare(v1, v2)) {
43: return th.createAndThrowException(
44: "java.lang.ArithmeticException",
45: "comparing in-exact values: " + v2 + "<" + v1);
46: }
47:
48: if (Float.isNaN(v1) || Float.isNaN(v2)) {
49: th.push(1, false);
50: } else if (v1 == v2) {
51: th.push(0, false);
52: } else if (v2 > v1) {
53: th.push(1, false);
54: } else {
55: th.push(-1, false);
56: }
57:
58: return getNext(th);
59: }
60:
61: public int getByteCode() {
62: return 0x96;
63: }
64: }
|