From 1e3b90c865726d191859866f7b10ac5d14b936d9 Mon Sep 17 00:00:00 2001
From: Emily Marshall <e.marshall3@student.unimelb.edu.au>
Date: Tue, 11 Sep 2018 03:49:18 +1000
Subject: [PATCH] Update Machine.java
---
mutants/mutant-4/swen90006/machine/Machine.java | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/mutants/mutant-4/swen90006/machine/Machine.java b/mutants/mutant-4/swen90006/machine/Machine.java
index 9bf5731..f5e5c1e 100644
--- a/mutants/mutant-4/swen90006/machine/Machine.java
+++ b/mutants/mutant-4/swen90006/machine/Machine.java
@@ -1,3 +1,6 @@
+//abs value of register value in ADD:
+//may not be caught if test cases don't include
+//negative values for ADD insturction.
package swen90006.machine;
import java.util.Arrays;
@@ -58,7 +61,11 @@ public class Machine
private void do_add(int dest, int src1, int src2)
{
- regs[dest] = regs[src1] + regs[src2];
+ regs[dest] = regs[src1] + abs(regs[src2]);
+//abs value of register value in ADD:
+//may not be caught if test cases don't include
+//negative values for ADD insturction.
+
}
private void do_sub(int dest, int src1, int src2)
@@ -77,6 +84,7 @@ public class Machine
/* no op */
}else{
regs[dest] = regs[src1] / regs[src2];
+
}
}
@@ -168,9 +176,10 @@ public class Machine
int instructionsExecuted = 0;
int pc = 0;
- final int progLength = instructions.size();
+ final int progLength = instructions.size()-1;
while(true){
if (pc < 0 || pc >= progLength){
+
/* will cause NoReturnValueException to be thrown
* but that is not a bug and and indeed is what the
* VM is supposed to do if the pc becomes negative,
--
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