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Use (size + 31) >> 5, not (size >> 5) + 1 as a size for int array buffer so in the case when size % 32 == 0 array would not hold a never used tail element.

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igor%mir2.org 2003-03-11 09:59:39 +00:00
parent ce16fbb0c1
commit 47a9d77f0f
1 changed files with 20 additions and 13 deletions
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33
js/rhino/src/org/mozilla/javascript/optimizer/DataFlowBitSet.java
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@ -40,12 +40,12 @@ package org.mozilla.javascript.optimizer;
class DataFlowBitSet {
private int itsBits[];
int itsSize;
private int itsSize;
DataFlowBitSet(int size)
{
itsSize = size;
itsBits = new int[(size >> 5) + 1];
itsBits = new int[(size + 31) >> 5];
}
int size()
@ -55,15 +55,13 @@ class DataFlowBitSet {
void set(int n)
{
if ((n < 0) || (n >= itsSize))
throw new RuntimeException("DataFlowBitSet bad index " + n);
if (!(0 <= n && n < itsSize)) badIndex(n);
itsBits[n >> 5] |= 1 << (n & 31);
}
boolean test(int n)
{
if ((n < 0) || (n >= itsSize))
throw new RuntimeException("DataFlowBitSet bad index " + n);
if (!(0 <= n && n < itsSize)) badIndex(n);
return ((itsBits[n >> 5] & (1 << (n & 31))) != 0);
}
@ -76,8 +74,7 @@ class DataFlowBitSet {
void clear(int n)
{
if ((n < 0) || (n >= itsSize))
throw new RuntimeException("DataFlowBitSet bad index " + n);
if (!(0 <= n && n < itsSize)) badIndex(n);
itsBits[n >> 5] &= ~(1 << (n & 31));
}
@ -97,11 +94,16 @@ class DataFlowBitSet {
public String toString()
{
StringBuffer result = new StringBuffer();
result.append("DataFlowBitSet, size = " + itsSize + "\n");
for (int i = 0; i < itsBits.length; i++)
result.append(Integer.toHexString(itsBits[i]) + " ");
return result.toString();
StringBuffer sb = new StringBuffer();
sb.append("DataFlowBitSet, size = ");
sb.append(itsSize);
sb.append('\n');
int bitsLength = itsBits.length;
for (int i = 0; i < bitsLength; i++) {
sb.append(Integer.toHexString(itsBits[i]));
sb.append(' ');
}
return sb.toString();
}
boolean df(DataFlowBitSet in, DataFlowBitSet gen, DataFlowBitSet notKill)
@ -127,4 +129,9 @@ class DataFlowBitSet {
}
return changed;
}
private void badIndex(int n)
{
throw new RuntimeException("DataFlowBitSet bad index " + n);
}
}