Java Code Examples for jdk.nashorn.internal.lookup.Lookup#filterReturnType()
The following examples show how to use
jdk.nashorn.internal.lookup.Lookup#filterReturnType() .
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Example 1
| Source File: ContinuousArrayData.java From jdk8u_nashorn with GNU General Public License v2.0 | 6 votes |
|
/**
* Return element getter for a {@link ContinuousArrayData}
* @param clazz clazz for exact type guard
* @param getHas has getter
* @param returnType return type
* @param programPoint program point
* @return method handle for element setter
*/
protected MethodHandle getContinuousElementGetter(final Class<? extends ContinuousArrayData> clazz, final MethodHandle getHas, final Class<?> returnType, final int programPoint) {
final boolean isOptimistic = isValid(programPoint);
final int fti = getAccessorTypeIndex(getHas.type().returnType());
final int ti = getAccessorTypeIndex(returnType);
MethodHandle mh = getHas;
if (isOptimistic) {
if (ti < fti) {
mh = MH.insertArguments(ArrayData.THROW_UNWARRANTED.methodHandle(), 1, programPoint);
}
}
mh = MH.asType(mh, mh.type().changeReturnType(returnType).changeParameterType(0, clazz));
if (!isOptimistic) {
//for example a & array[17];
return Lookup.filterReturnType(mh, returnType);
}
return mh;
}
Example 2
| Source File: ContinuousArrayData.java From openjdk-jdk9 with GNU General Public License v2.0 | 6 votes |
|
/**
* Return element getter for a {@link ContinuousArrayData}
* @param clazz clazz for exact type guard
* @param getHas has getter
* @param returnType return type
* @param programPoint program point
* @return method handle for element setter
*/
protected MethodHandle getContinuousElementGetter(final Class<? extends ContinuousArrayData> clazz, final MethodHandle getHas, final Class<?> returnType, final int programPoint) {
final boolean isOptimistic = isValid(programPoint);
final int fti = getAccessorTypeIndex(getHas.type().returnType());
final int ti = getAccessorTypeIndex(returnType);
MethodHandle mh = getHas;
if (isOptimistic) {
if (ti < fti) {
mh = MH.insertArguments(ArrayData.THROW_UNWARRANTED.methodHandle(), 1, programPoint);
}
}
mh = MH.asType(mh, mh.type().changeReturnType(returnType).changeParameterType(0, clazz));
if (!isOptimistic) {
//for example a & array[17];
return Lookup.filterReturnType(mh, returnType);
}
return mh;
}
Example 3
| Source File: ContinuousArrayData.java From hottub with GNU General Public License v2.0 | 6 votes |
|
/**
* Return element getter for a {@link ContinuousArrayData}
* @param clazz clazz for exact type guard
* @param getHas has getter
* @param returnType return type
* @param programPoint program point
* @return method handle for element setter
*/
protected MethodHandle getContinuousElementGetter(final Class<? extends ContinuousArrayData> clazz, final MethodHandle getHas, final Class<?> returnType, final int programPoint) {
final boolean isOptimistic = isValid(programPoint);
final int fti = getAccessorTypeIndex(getHas.type().returnType());
final int ti = getAccessorTypeIndex(returnType);
MethodHandle mh = getHas;
if (isOptimistic) {
if (ti < fti) {
mh = MH.insertArguments(ArrayData.THROW_UNWARRANTED.methodHandle(), 1, programPoint);
}
}
mh = MH.asType(mh, mh.type().changeReturnType(returnType).changeParameterType(0, clazz));
if (!isOptimistic) {
//for example a & array[17];
return Lookup.filterReturnType(mh, returnType);
}
return mh;
}
Example 4
| Source File: ContinuousArrayData.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 6 votes |
|
/**
* Return element getter for a {@link ContinuousArrayData}
* @param clazz clazz for exact type guard
* @param getHas has getter
* @param returnType return type
* @param programPoint program point
* @return method handle for element setter
*/
protected MethodHandle getContinuousElementGetter(final Class<? extends ContinuousArrayData> clazz, final MethodHandle getHas, final Class<?> returnType, final int programPoint) {
final boolean isOptimistic = isValid(programPoint);
final int fti = getAccessorTypeIndex(getHas.type().returnType());
final int ti = getAccessorTypeIndex(returnType);
MethodHandle mh = getHas;
if (isOptimistic) {
if (ti < fti) {
mh = MH.insertArguments(ArrayData.THROW_UNWARRANTED.methodHandle(), 1, programPoint);
}
}
mh = MH.asType(mh, mh.type().changeReturnType(returnType).changeParameterType(0, clazz));
if (!isOptimistic) {
//for example a & array[17];
return Lookup.filterReturnType(mh, returnType);
}
return mh;
}
Example 5
| Source File: TypedArrayData.java From TencentKona-8 with GNU General Public License v2.0 | 5 votes |
|
@Override
public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
final MethodHandle getter = getContinuousElementGetter(getClass(), getGetElem(), returnType, programPoint);
if (getter != null) {
return Lookup.filterReturnType(getter, returnType);
}
return getter;
}
Example 6
| Source File: TypedArrayData.java From jdk8u_nashorn with GNU General Public License v2.0 | 5 votes |
|
@Override
public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
final MethodHandle getter = getContinuousElementGetter(getClass(), getGetElem(), returnType, programPoint);
if (getter != null) {
return Lookup.filterReturnType(getter, returnType);
}
return getter;
}
Example 7
| Source File: TypedArrayData.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
|
@Override
public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
final MethodHandle getter = getContinuousElementGetter(getClass(), getGetElem(), returnType, programPoint);
if (getter != null) {
return Lookup.filterReturnType(getter, returnType);
}
return getter;
}
Example 8
| Source File: UserAccessorProperty.java From openjdk-jdk9 with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 9
| Source File: UserAccessorProperty.java From hottub with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 10
| Source File: UserAccessorProperty.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 11
| Source File: GlobalConstants.java From openjdk-jdk8u-backup with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
Example 12
| Source File: UserAccessorProperty.java From openjdk-8 with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
return Lookup.filterReturnType(USER_ACCESSOR_GETTER.methodHandle(), type);
}
Example 13
| Source File: GlobalConstants.java From jdk8u_nashorn with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
Example 14
| Source File: GlobalConstants.java From openjdk-jdk8u with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
Example 15
| Source File: GlobalConstants.java From hottub with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
Example 16
| Source File: UserAccessorProperty.java From jdk8u60 with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 17
| Source File: GlobalConstants.java From jdk8u60 with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
Example 18
| Source File: UserAccessorProperty.java From jdk8u_nashorn with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 19
| Source File: UserAccessorProperty.java From TencentKona-8 with GNU General Public License v2.0 | 4 votes |
|
@Override
public MethodHandle getGetter(final Class<?> type) {
//this returns a getter on the format (Accessors, Object receiver)
return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type);
}
Example 20
| Source File: GlobalConstants.java From TencentKona-8 with GNU General Public License v2.0 | 4 votes |
|
/**
* Try to turn a getter into a MethodHandle.constant, if possible
*
* @param find property lookup
* @param receiver receiver
* @param desc callsite descriptor
*
* @return resulting getter, or null if failed to create constant
*/
GuardedInvocation findGetMethod(final FindProperty find, final ScriptObject receiver, final CallSiteDescriptor desc) {
// Only use constant getter for fast scope access, because the receiver may change between invocations
// for slow-scope and non-scope callsites.
// Also return null for user accessor properties as they may have side effects.
if (invalidatedForever.get() || !NashornCallSiteDescriptor.isFastScope(desc)
|| (GLOBAL_ONLY && !find.getOwner().isGlobal())
|| find.getProperty() instanceof UserAccessorProperty) {
return null;
}
final boolean isOptimistic = NashornCallSiteDescriptor.isOptimistic(desc);
final int programPoint = isOptimistic ? getProgramPoint(desc) : INVALID_PROGRAM_POINT;
final Class<?> retType = desc.getMethodType().returnType();
final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
synchronized (this) {
final Access acc = getOrCreateSwitchPoint(name);
log.fine("Starting to look up object value " + name);
final Object c = find.getObjectValue();
if (log.isEnabled()) {
log.fine("Trying to link constant GETTER " + acc + " value = " + c);
}
if (acc.hasBeenInvalidated() || acc.guardFailed() || invalidatedForever.get()) {
if (log.isEnabled()) {
log.info("*** GET: Giving up on " + quote(name) + " - retry count has exceeded " + DynamicLinker.getLinkedCallSiteLocation());
}
return null;
}
final MethodHandle cmh = constantGetter(c);
MethodHandle mh;
MethodHandle guard;
if (isOptimistic) {
if (JSType.getAccessorTypeIndex(cmh.type().returnType()) <= JSType.getAccessorTypeIndex(retType)) {
//widen return type - this is pessimistic, so it will always work
mh = MH.asType(cmh, cmh.type().changeReturnType(retType));
} else {
//immediately invalidate - we asked for a too wide constant as a narrower one
mh = MH.dropArguments(MH.insertArguments(JSType.THROW_UNWARRANTED.methodHandle(), 0, c, programPoint), 0, Object.class);
}
} else {
//pessimistic return type filter
mh = Lookup.filterReturnType(cmh, retType);
}
if (find.getOwner().isGlobal()) {
guard = null;
} else {
guard = MH.insertArguments(RECEIVER_GUARD, 0, acc, receiver);
}
if (log.isEnabled()) {
log.info("Linked getter " + quote(name) + " as MethodHandle.constant() -> " + c + " " + acc.getSwitchPoint());
mh = MethodHandleFactory.addDebugPrintout(log, Level.FINE, mh, "get const " + acc);
}
return new GuardedInvocation(mh, guard, acc.getSwitchPoint(), null);
}
}
