8175312: SA: clhsdb: Provide an improved heap summary for 'universe' for G1GC
Summary: Provide an improved heap summary for G1GC with parameters like 'capacity', 'used', 'free', etc with the 'universe' command, and introduce a new command 'g1regiondetails' to display the individual region details.
Reviewed-by: sjohanss, minqi
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package sun.jvm.hotspot.gc.g1;
import java.util.Observable;
import java.util.Observer;
import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.runtime.VMObject;
import sun.jvm.hotspot.types.CIntegerField;
import sun.jvm.hotspot.types.Type;
import sun.jvm.hotspot.types.TypeDataBase;
// Mirror class for HeapRegionType. Currently we don't actually include
// any of its fields but only iterate over it.
public class HeapRegionType extends VMObject {
private static int freeTag;
private static int youngMask;
private static int edenTag;
private static int survTag;
private static int humongousMask;
private static int startsHumongousTag;
private static int continuesHumongousTag;
private static int pinnedMask;
private static int archiveMask;
private static int oldMask;
private static CIntegerField tagField;
private int tag;
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static synchronized void initialize(TypeDataBase db) {
Type type = db.lookupType("HeapRegionType");
tagField = type.getCIntegerField("_tag");
freeTag = db.lookupIntConstant("HeapRegionType::FreeTag");
youngMask = db.lookupIntConstant("HeapRegionType::YoungMask");
edenTag = db.lookupIntConstant("HeapRegionType::EdenTag");
survTag = db.lookupIntConstant("HeapRegionType::SurvTag");
startsHumongousTag = db.lookupIntConstant("HeapRegionType::StartsHumongousTag");
continuesHumongousTag = db.lookupIntConstant("HeapRegionType::ContinuesHumongousTag");
archiveMask = db.lookupIntConstant("HeapRegionType::ArchiveMask");
humongousMask = db.lookupIntConstant("HeapRegionType::HumongousMask");
pinnedMask = db.lookupIntConstant("HeapRegionType::PinnedMask");
oldMask = db.lookupIntConstant("HeapRegionType::OldMask");
}
public boolean isFree() {
return tagField.getValue(addr) == freeTag;
}
public boolean isEden() {
return tagField.getValue(addr) == edenTag;
}
public boolean isSurvivor() {
return tagField.getValue(addr) == survTag;
}
public boolean isYoung() {
return (tagField.getValue(addr) & youngMask) != 0;
}
public boolean isHumongous() {
return (tagField.getValue(addr) & humongousMask) != 0;
}
public boolean isStartsHumongous() {
return tagField.getValue(addr) == startsHumongousTag;
}
public boolean isContinuesHumongous() {
return tagField.getValue(addr) == continuesHumongousTag;
}
public boolean isArchive() {
return (tagField.getValue(addr) & archiveMask) != 0;
}
public boolean isPinned() {
return (tagField.getValue(addr) & pinnedMask) != 0;
}
public boolean isOld() {
return (tagField.getValue(addr) & oldMask) != 0;
}
public HeapRegionType(Address addr) {
super(addr);
}
public String typeAnnotation() {
if (isFree()) {
return "Free";
}
if (isEden()) {
return "Eden";
}
if (isSurvivor()) {
return "Survivor";
}
if (isStartsHumongous()) {
return "StartsHumongous";
}
if (isContinuesHumongous()) {
return "ContinuesHumongous";
}
if (isArchive()) {
return "Archive";
}
if (isPinned()) {
return "Pinned";
}
if (isOld()) {
return "Old";
}
return "Unknown Region Type";
}
}