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agent/src/share/classes/sun/jvm/hotspot/memory/GenCollectedHeap.java
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rev 7696 : 8061802: REDO - Remove the generations array
Summary: The _gens array is removed and replaced by explicit _young_gen and _old_gen variables.
Reviewed-by:
@@ -33,11 +33,12 @@
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;
public class GenCollectedHeap extends SharedHeap {
private static CIntegerField nGensField;
- private static long gensOffset;
+ private static AddressField youngGenField;
+ private static AddressField oldGenField;
private static AddressField genSpecsField;
private static GenerationFactory genFactory;
static {
@@ -50,11 +51,12 @@
private static synchronized void initialize(TypeDataBase db) {
Type type = db.lookupType("GenCollectedHeap");
nGensField = type.getCIntegerField("_n_gens");
- gensOffset = type.getField("_gens").getOffset();
+ youngGenField = type.getAddressField("_young_gen");
+ oldGenField = type.getAddressField("_old_gen");
genSpecsField = type.getAddressField("_gen_specs");
genFactory = new GenerationFactory();
}
@@ -70,18 +72,19 @@
if (Assert.ASSERTS_ENABLED) {
Assert.that((i >= 0) && (i < nGens()), "Index " + i +
" out of range (should be between 0 and " + nGens() + ")");
}
- if ((i < 0) || (i >= nGens())) {
+ switch (i) {
+ case 0:
+ return genFactory.newObject(youngGenField.getAddress());
+ case 1:
+ return genFactory.newObject(oldGenField.getAddress());
+ default:
+ // no generation for i, and assertions disabled.
return null;
}
-
- Address genAddr = addr.getAddressAt(gensOffset +
- (i * VM.getVM().getAddressSize()));
- return genFactory.newObject(addr.getAddressAt(gensOffset +
- (i * VM.getVM().getAddressSize())));
}
public boolean isIn(Address a) {
for (int i = 0; i < nGens(); i++) {
Generation gen = getGen(i);
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