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src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/MarkBits.java
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@@ -39,12 +39,11 @@
MemRegion reserved = heap.reservedRegion();
// Must cover "reserved" with one bit for each OopHandle
start = reserved.start();
end = reserved.end();
long numOopHandles = end.minus(start) / VM.getVM().getOopSize();
- // FIXME: will have trouble with larger heap sizes
- bits = new BitMap((int) numOopHandles);
+ bits = heap.createBitMap(numOopHandles);
}
public void clear() {
bits.clear();
}
@@ -58,36 +57,24 @@
System.err.println("MarkBits: WARNING: null object, ignoring");
return false;
}
OopHandle handle = obj.getHandle();
- // FIXME: will have trouble with larger heap sizes
long idx = handle.minus(start) / VM.getVM().getOopSize();
- if ((idx < 0) || (idx >= bits.size())) {
- System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring");
- return false;
- }
- int intIdx = (int) idx;
- if (bits.at(intIdx)) {
+ if (bits.at(idx)) {
return false; // already marked
}
- bits.atPut(intIdx, true);
+ bits.atPut(idx, true);
return true;
}
/** Forces clearing of a given mark bit. */
public void clear(Oop obj) {
OopHandle handle = obj.getHandle();
- // FIXME: will have trouble with larger heap sizes
long idx = handle.minus(start) / VM.getVM().getOopSize();
- if ((idx < 0) || (idx >= bits.size())) {
- System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring");
- return;
- }
- int intIdx = (int) idx;
- bits.atPut(intIdx, false);
+ bits.atPut(idx, false);
}
- private BitMap bits;
+ private BitMapInterface bits;
private Address start;
private Address end;
}
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