726 .with(StackMapTableAttribute.of(stackMapFrames));
727 DirectCodeBuilder.withMaxs(cb, 3, locals.size()); // enum labels use 3 stack, others use 2
728 };
729 }
730
731 private static boolean isNotValidPair(Class<?> selectorType, Object caseLabel) {
732 return (selectorType == boolean.class && caseLabel != boolean.class && caseLabel != Boolean.class) ||
733 (selectorType != boolean.class && selectorType.isPrimitive() && (caseLabel == boolean.class || caseLabel == Boolean.class));
734 }
735
736 /*
737 * Construct the method handle that represents the method int typeSwitch(Object, int, BiPredicate, List)
738 */
739 private static MethodHandle generateTypeSwitch(MethodHandles.Lookup caller, Class<?> selectorType, Object[] labelConstants) {
740 boolean addExtraInfo = needsExtraInfo(selectorType, labelConstants);
741 List<EnumDesc<?>> enumDescs = addExtraInfo ? new ArrayList<>() : null;
742 List<Class<?>> extraClassLabels = addExtraInfo ? new ArrayList<>() : null;
743
744 byte[] classBytes = ClassFile.of(ClassFile.StackMapsOption.DROP_STACK_MAPS).build(ConstantUtils.binaryNameToDesc(typeSwitchClassName(caller.lookupClass())),
745 clb -> {
746 clb.withFlags(AccessFlag.FINAL, AccessFlag.SUPER, AccessFlag.SYNTHETIC)
747 .withMethodBody("typeSwitch",
748 addExtraInfo ? MTD_TYPE_SWITCH_EXTRA : MTD_TYPE_SWITCH,
749 ClassFile.ACC_FINAL | ClassFile.ACC_PUBLIC | ClassFile.ACC_STATIC,
750 generateTypeSwitchSkeleton(selectorType, labelConstants, enumDescs, extraClassLabels));
751 });
752
753 try {
754 // this class is linked at the indy callsite; so define a hidden nestmate
755 MethodHandles.Lookup lookup;
756 lookup = caller.defineHiddenClass(classBytes, true, NESTMATE, STRONG);
757 MethodHandle typeSwitch = lookup.findStatic(lookup.lookupClass(),
758 "typeSwitch",
759 addExtraInfo ? MT_TYPE_SWITCH_EXTRA : MT_TYPE_SWITCH);
760 if (addExtraInfo) {
761 typeSwitch = MethodHandles.insertArguments(typeSwitch, 2, new ResolvedEnumLabels(caller, enumDescs.toArray(new EnumDesc<?>[0])),
762 List.copyOf(extraClassLabels));
763 }
764 return typeSwitch;
765 } catch (Throwable t) {
766 throw new IllegalArgumentException(t);
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726 .with(StackMapTableAttribute.of(stackMapFrames));
727 DirectCodeBuilder.withMaxs(cb, 3, locals.size()); // enum labels use 3 stack, others use 2
728 };
729 }
730
731 private static boolean isNotValidPair(Class<?> selectorType, Object caseLabel) {
732 return (selectorType == boolean.class && caseLabel != boolean.class && caseLabel != Boolean.class) ||
733 (selectorType != boolean.class && selectorType.isPrimitive() && (caseLabel == boolean.class || caseLabel == Boolean.class));
734 }
735
736 /*
737 * Construct the method handle that represents the method int typeSwitch(Object, int, BiPredicate, List)
738 */
739 private static MethodHandle generateTypeSwitch(MethodHandles.Lookup caller, Class<?> selectorType, Object[] labelConstants) {
740 boolean addExtraInfo = needsExtraInfo(selectorType, labelConstants);
741 List<EnumDesc<?>> enumDescs = addExtraInfo ? new ArrayList<>() : null;
742 List<Class<?>> extraClassLabels = addExtraInfo ? new ArrayList<>() : null;
743
744 byte[] classBytes = ClassFile.of(ClassFile.StackMapsOption.DROP_STACK_MAPS).build(ConstantUtils.binaryNameToDesc(typeSwitchClassName(caller.lookupClass())),
745 clb -> {
746 clb.withFlags(AccessFlag.FINAL, (PreviewFeatures.isEnabled()) ? AccessFlag.IDENTITY : AccessFlag.SUPER, AccessFlag.SYNTHETIC)
747 .withMethodBody("typeSwitch",
748 addExtraInfo ? MTD_TYPE_SWITCH_EXTRA : MTD_TYPE_SWITCH,
749 ClassFile.ACC_FINAL | ClassFile.ACC_PUBLIC | ClassFile.ACC_STATIC,
750 generateTypeSwitchSkeleton(selectorType, labelConstants, enumDescs, extraClassLabels));
751 });
752
753 try {
754 // this class is linked at the indy callsite; so define a hidden nestmate
755 MethodHandles.Lookup lookup;
756 lookup = caller.defineHiddenClass(classBytes, true, NESTMATE, STRONG);
757 MethodHandle typeSwitch = lookup.findStatic(lookup.lookupClass(),
758 "typeSwitch",
759 addExtraInfo ? MT_TYPE_SWITCH_EXTRA : MT_TYPE_SWITCH);
760 if (addExtraInfo) {
761 typeSwitch = MethodHandles.insertArguments(typeSwitch, 2, new ResolvedEnumLabels(caller, enumDescs.toArray(new EnumDesc<?>[0])),
762 List.copyOf(extraClassLabels));
763 }
764 return typeSwitch;
765 } catch (Throwable t) {
766 throw new IllegalArgumentException(t);
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