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8339939: [JVMCI] Don't compress abstract and interface Klasses #20949

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8339939: [JVMCI] Don't compress abstract and interface Klasses #20949

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df93959
make JVMCI aware that some klass pointers are not compressible
dougxc Sep 11, 2024
712272b
trim trailing whitespace
mur47x111 Sep 11, 2024
7fc4bef
Merge master
mur47x111 Oct 16, 2024
92001a8
address comments.
mur47x111 Oct 16, 2024
e44d98a
Fix JIT error.
mur47x111 Oct 16, 2024
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6 changes: 5 additions & 1 deletion src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotMetaspaceConstantImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ static MetaspaceObject getMetaspaceObject(Constant constant) {
private HotSpotMetaspaceConstantImpl(MetaspaceObject metaspaceObject, boolean compressed) {
this.metaspaceObject = metaspaceObject;
this.compressed = compressed;
if (compressed && !isCompressible()) {
if (compressed && !canBeStoredInCompressibleMetaSpace()) {
throw new IllegalArgumentException("constant cannot be compressed: " + metaspaceObject);
}
}
Expand Down Expand Up @@ -91,6 +91,10 @@ public boolean isCompressible() {
if (compressed) {
return false;
}
return canBeStoredInCompressibleMetaSpace();
}

private boolean canBeStoredInCompressibleMetaSpace() {
if (metaspaceObject instanceof HotSpotResolvedJavaType t && !t.isArray()) {
// As of JDK-8338526, interface and abstract types are not stored
// in compressible metaspace.
Expand Down