/*

* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*/

package java.lang.invoke;

import sun.misc.Unsafe;

import java.lang.reflect.Method;

import java.util.Arrays;

import sun.invoke.util.VerifyAccess;

import static java.lang.invoke.MethodHandleNatives.Constants.*;

import static java.lang.invoke.LambdaForm.*;

import static java.lang.invoke.MethodTypeForm.*;

import static java.lang.invoke.MethodHandleStatics.*;

import java.lang.ref.WeakReference;

import java.lang.reflect.Field;

import sun.invoke.util.ValueConversions;

import sun.invoke.util.VerifyType;

import sun.invoke.util.Wrapper;

/**

* The flavor of method handle which implements a constant reference

* to a class member.

* @author jrose

*/

class DirectMethodHandle extends MethodHandle {

final MemberName member;

// Constructors and factory methods in this class *must* be package scoped or private.

private DirectMethodHandle(MethodType mtype, LambdaForm form, MemberName member) {

super(mtype, form);

if (!member.isResolved()) throw new InternalError();

if (member.getDeclaringClass().isInterface() &&

member.isMethod() && !member.isAbstract()) {

// Check for corner case: invokeinterface of Object method

MemberName m = new MemberName(Object.class, member.getName(), member.getMethodType(), member.getReferenceKind());

m = MemberName.getFactory().resolveOrNull(m.getReferenceKind(), m, null);

if (m != null && m.isPublic()) {

member = m;

}

}

this.member = member;

}

// Factory methods:

static DirectMethodHandle make(byte refKind, Class<?> receiver, MemberName member) {

MethodType mtype = member.getMethodOrFieldType();

if (!member.isStatic()) {

if (!member.getDeclaringClass().isAssignableFrom(receiver) || member.isConstructor())

throw new InternalError(member.toString());

mtype = mtype.insertParameterTypes(0, receiver);

}

if (!member.isField()) {

if (refKind == REF_invokeSpecial) {

member = member.asSpecial();

LambdaForm lform = preparedLambdaForm(member);

return new Special(mtype, lform, member);

} else {

LambdaForm lform = preparedLambdaForm(member);

return new DirectMethodHandle(mtype, lform, member);

}

} else {

LambdaForm lform = preparedFieldLambdaForm(member);

if (member.isStatic()) {

long offset = MethodHandleNatives.staticFieldOffset(member);

Object base = MethodHandleNatives.staticFieldBase(member);

return new StaticAccessor(mtype, lform, member, base, offset);

} else {

long offset = MethodHandleNatives.objectFieldOffset(member);

assert(offset == (int)offset);

return new Accessor(mtype, lform, member, (int)offset);

}

}

}

static DirectMethodHandle make(Class<?> receiver, MemberName member) {

byte refKind = member.getReferenceKind();

if (refKind == REF_invokeSpecial)

refKind = REF_invokeVirtual;

return make(refKind, receiver, member);

}

static DirectMethodHandle make(MemberName member) {

if (member.isConstructor())

return makeAllocator(member);

return make(member.getDeclaringClass(), member);

}

static DirectMethodHandle make(Method method) {

return make(method.getDeclaringClass(), new MemberName(method));

}

static DirectMethodHandle make(Field field) {

return make(field.getDeclaringClass(), new MemberName(field));

}

private static DirectMethodHandle makeAllocator(MemberName ctor) {

assert(ctor.isConstructor() && ctor.getName().equals("<init>"));

Class<?> instanceClass = ctor.getDeclaringClass();

ctor = ctor.asConstructor();

assert(ctor.isConstructor() && ctor.getReferenceKind() == REF_newInvokeSpecial) : ctor;

MethodType mtype = ctor.getMethodType().changeReturnType(instanceClass);

LambdaForm lform = preparedLambdaForm(ctor);

MemberName init = ctor.asSpecial();

assert(init.getMethodType().returnType() == void.class);

return new Constructor(mtype, lform, ctor, init, instanceClass);

}

@Override

MethodHandle copyWith(MethodType mt, LambdaForm lf) {

return new DirectMethodHandle(mt, lf, member);

}

@Override

String internalProperties() {

return "/DMH="+member.toString();

}

//// Implementation methods.

@Override

MethodHandle viewAsType(MethodType newType) {

return new DirectMethodHandle(newType, form, member);

}

@Override

@ForceInline

MemberName internalMemberName() {

return member;

}

@Override

MethodHandle bindArgument(int pos, char basicType, Object value) {

// If the member needs dispatching, do so.

if (pos == 0 && basicType == 'L') {

DirectMethodHandle concrete = maybeRebind(value);

if (concrete != null)

return concrete.bindReceiver(value);

}

return super.bindArgument(pos, basicType, value);

}

@Override

MethodHandle bindReceiver(Object receiver) {

// If the member needs dispatching, do so.

DirectMethodHandle concrete = maybeRebind(receiver);

if (concrete != null)

return concrete.bindReceiver(receiver);

return super.bindReceiver(receiver);

}

private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory();

private DirectMethodHandle maybeRebind(Object receiver) {

if (receiver != null) {

switch (member.getReferenceKind()) {

case REF_invokeInterface:

case REF_invokeVirtual:

// Pre-dispatch the member.

Class<?> concreteClass = receiver.getClass();

MemberName concrete = new MemberName(concreteClass, member.getName(), member.getMethodType(), REF_invokeSpecial);

concrete = IMPL_NAMES.resolveOrNull(REF_invokeSpecial, concrete, concreteClass);

if (concrete != null)

return new DirectMethodHandle(type(), preparedLambdaForm(concrete), concrete);

break;

}

}

return null;

}

/**

* Create a LF which can invoke the given method.

* Cache and share this structure among all methods with

* the same basicType and refKind.

*/

private static LambdaForm preparedLambdaForm(MemberName m) {

assert(m.isInvocable()) : m; // call preparedFieldLambdaForm instead

MethodType mtype = m.getInvocationType().basicType();

assert(!m.isMethodHandleInvoke() || "invokeBasic".equals(m.getName())) : m;

int which;

switch (m.getReferenceKind()) {

case REF_invokeVirtual: which = LF_INVVIRTUAL; break;

case REF_invokeStatic: which = LF_INVSTATIC; break;

case REF_invokeSpecial: which = LF_INVSPECIAL; break;

case REF_invokeInterface: which = LF_INVINTERFACE; break;

case REF_newInvokeSpecial: which = LF_NEWINVSPECIAL; break;

default: throw new InternalError(m.toString());

}

if (which == LF_INVSTATIC && shouldBeInitialized(m)) {

// precompute the barrier-free version:

preparedLambdaForm(mtype, which);

which = LF_INVSTATIC_INIT;

}

LambdaForm lform = preparedLambdaForm(mtype, which);

maybeCompile(lform, m);

assert(lform.methodType().dropParameterTypes(0, 1)

.equals(m.getInvocationType().basicType()))

: Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());

return lform;

}

private static LambdaForm preparedLambdaForm(MethodType mtype, int which) {

LambdaForm lform = mtype.form().cachedLambdaForm(which);

if (lform != null) return lform;

lform = makePreparedLambdaForm(mtype, which);

return mtype.form().setCachedLambdaForm(which, lform);

}

private static LambdaForm makePreparedLambdaForm(MethodType mtype, int which) {

boolean needsInit = (which == LF_INVSTATIC_INIT);

boolean doesAlloc = (which == LF_NEWINVSPECIAL);

String linkerName, lambdaName;

switch (which) {

case LF_INVVIRTUAL: linkerName = "linkToVirtual"; lambdaName = "DMH.invokeVirtual"; break;

case LF_INVSTATIC: linkerName = "linkToStatic"; lambdaName = "DMH.invokeStatic"; break;

case LF_INVSTATIC_INIT:linkerName = "linkToStatic"; lambdaName = "DMH.invokeStaticInit"; break;

case LF_INVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.invokeSpecial"; break;

case LF_INVINTERFACE: linkerName = "linkToInterface"; lambdaName = "DMH.invokeInterface"; break;

case LF_NEWINVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.newInvokeSpecial"; break;

default: throw new InternalError("which="+which);

}

MethodType mtypeWithArg = mtype.appendParameterTypes(MemberName.class);

if (doesAlloc)

mtypeWithArg = mtypeWithArg

.insertParameterTypes(0, Object.class) // insert newly allocated obj

.changeReturnType(void.class); // <init> returns void

MemberName linker = new MemberName(MethodHandle.class, linkerName, mtypeWithArg, REF_invokeStatic);

try {

linker = IMPL_NAMES.resolveOrFail(REF_invokeStatic, linker, null, NoSuchMethodException.class);

} catch (ReflectiveOperationException ex) {

throw newInternalError(ex);

}

final int DMH_THIS = 0;

final int ARG_BASE = 1;

final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();

int nameCursor = ARG_LIMIT;

final int NEW_OBJ = (doesAlloc ? nameCursor++ : -1);

final int GET_MEMBER = nameCursor++;

final int LINKER_CALL = nameCursor++;

Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());

assert(names.length == nameCursor);

if (doesAlloc) {

// names = { argx,y,z,... new C, init method }

names[NEW_OBJ] = new Name(Lazy.NF_allocateInstance, names[DMH_THIS]);

names[GET_MEMBER] = new Name(Lazy.NF_constructorMethod, names[DMH_THIS]);

} else if (needsInit) {

names[GET_MEMBER] = new Name(Lazy.NF_internalMemberNameEnsureInit, names[DMH_THIS]);

} else {

names[GET_MEMBER] = new Name(Lazy.NF_internalMemberName, names[DMH_THIS]);

}

Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, GET_MEMBER+1, Object[].class);

assert(outArgs[outArgs.length-1] == names[GET_MEMBER]); // look, shifted args!

int result = LambdaForm.LAST_RESULT;

if (doesAlloc) {

assert(outArgs[outArgs.length-2] == names[NEW_OBJ]); // got to move this one

System.arraycopy(outArgs, 0, outArgs, 1, outArgs.length-2);

outArgs[0] = names[NEW_OBJ];

result = NEW_OBJ;

}

names[LINKER_CALL] = new Name(linker, outArgs);

lambdaName += "_" + LambdaForm.basicTypeSignature(mtype);

LambdaForm lform = new LambdaForm(lambdaName, ARG_LIMIT, names, result);

// This is a tricky bit of code. Don't send it through the LF interpreter.

lform.compileToBytecode();

return lform;

}

private static void maybeCompile(LambdaForm lform, MemberName m) {

if (VerifyAccess.isSamePackage(m.getDeclaringClass(), MethodHandle.class))

// Help along bootstrapping...

lform.compileToBytecode();

}

/** Static wrapper for DirectMethodHandle.internalMemberName. */

@ForceInline

/*non-public*/ static Object internalMemberName(Object mh) {

return ((DirectMethodHandle)mh).member;

}

/** Static wrapper for DirectMethodHandle.internalMemberName.

* This one also forces initialization.

*/

/*non-public*/ static Object internalMemberNameEnsureInit(Object mh) {

DirectMethodHandle dmh = (DirectMethodHandle)mh;

dmh.ensureInitialized();

return dmh.member;

}

/*non-public*/ static

boolean shouldBeInitialized(MemberName member) {

switch (member.getReferenceKind()) {

case REF_invokeStatic:

case REF_getStatic:

case REF_putStatic:

case REF_newInvokeSpecial:

break;

default:

// No need to initialize the class on this kind of member.

return false;

}

Class<?> cls = member.getDeclaringClass();

if (cls == ValueConversions.class ||

cls == MethodHandleImpl.class ||

cls == Invokers.class) {

// These guys have lots of <clinit> DMH creation but we know

// the MHs will not be used until the system is booted.

return false;

}

if (VerifyAccess.isSamePackage(MethodHandle.class, cls) ||

VerifyAccess.isSamePackage(ValueConversions.class, cls)) {

// It is a system class. It is probably in the process of

// being initialized, but we will help it along just to be safe.

if (UNSAFE.shouldBeInitialized(cls)) {

UNSAFE.ensureClassInitialized(cls);

}

return false;

}

return UNSAFE.shouldBeInitialized(cls);

}

private static class EnsureInitialized extends ClassValue<WeakReference<Thread>> {

@Override

protected WeakReference<Thread> computeValue(Class<?> type) {

UNSAFE.ensureClassInitialized(type);

if (UNSAFE.shouldBeInitialized(type))

// If the previous call didn't block, this can happen.

// We are executing inside <clinit>.

return new WeakReference<>(Thread.currentThread());

return null;

}

static final EnsureInitialized INSTANCE = new EnsureInitialized();

}

private void ensureInitialized() {

if (checkInitialized(member)) {

// The coast is clear. Delete the <clinit> barrier.

if (member.isField())

updateForm(preparedFieldLambdaForm(member));

else

updateForm(preparedLambdaForm(member));

}

}

private static boolean checkInitialized(MemberName member) {

Class<?> defc = member.getDeclaringClass();

WeakReference<Thread> ref = EnsureInitialized.INSTANCE.get(defc);

if (ref == null) {

return true; // the final state

}

Thread clinitThread = ref.get();

// Somebody may still be running defc.<clinit>.

if (clinitThread == Thread.currentThread()) {

// If anybody is running defc.<clinit>, it is this thread.

if (UNSAFE.shouldBeInitialized(defc))

// Yes, we are running it; keep the barrier for now.

return false;

} else {

// We are in a random thread. Block.

UNSAFE.ensureClassInitialized(defc);

}

assert(!UNSAFE.shouldBeInitialized(defc));

// put it into the final state

EnsureInitialized.INSTANCE.remove(defc);

return true;

}

/*non-public*/ static void ensureInitialized(Object mh) {

((DirectMethodHandle)mh).ensureInitialized();

}

/** This subclass represents invokespecial instructions. */

static class Special extends DirectMethodHandle {

private Special(MethodType mtype, LambdaForm form, MemberName member) {

super(mtype, form, member);

}

@Override

boolean isInvokeSpecial() {

return true;

}

@Override

MethodHandle viewAsType(MethodType newType) {

return new Special(newType, form, member);

}

}

/** This subclass handles constructor references. */

static class Constructor extends DirectMethodHandle {

final MemberName initMethod;

final Class<?> instanceClass;

private Constructor(MethodType mtype, LambdaForm form, MemberName constructor,

MemberName initMethod, Class<?> instanceClass) {

super(mtype, form, constructor);

this.initMethod = initMethod;

this.instanceClass = instanceClass;

assert(initMethod.isResolved());

}

@Override

MethodHandle viewAsType(MethodType newType) {

return new Constructor(newType, form, member, initMethod, instanceClass);

}

}

/*non-public*/ static Object constructorMethod(Object mh) {

Constructor dmh = (Constructor)mh;

return dmh.initMethod;

}

/*non-public*/ static Object allocateInstance(Object mh) throws InstantiationException {

Constructor dmh = (Constructor)mh;

return UNSAFE.allocateInstance(dmh.instanceClass);

}

/** This subclass handles non-static field references. */

static class Accessor extends DirectMethodHandle {

final Class<?> fieldType;

final int fieldOffset;

private Accessor(MethodType mtype, LambdaForm form, MemberName member,

int fieldOffset) {

super(mtype, form, member);

this.fieldType = member.getFieldType();

this.fieldOffset = fieldOffset;

}

@Override Object checkCast(Object obj) {

return fieldType.cast(obj);

}

@Override

MethodHandle viewAsType(MethodType newType) {

return new Accessor(newType, form, member, fieldOffset);

}

}

@ForceInline

/*non-public*/ static long fieldOffset(Object accessorObj) {

// Note: We return a long because that is what Unsafe.getObject likes.

// We store a plain int because it is more compact.

return ((Accessor)accessorObj).fieldOffset;

}

@ForceInline

/*non-public*/ static Object checkBase(Object obj) {

// Note that the object's class has already been verified,

// since the parameter type of the Accessor method handle

// is either member.getDeclaringClass or a subclass.

// This was verified in DirectMethodHandle.make.

// Therefore, the only remaining check is for null.

// Since this check is *not* guaranteed by Unsafe.getInt

// and its siblings, we need to make an explicit one here.

obj.getClass(); // maybe throw NPE

return obj;

}

/** This subclass handles static field references. */

static class StaticAccessor extends DirectMethodHandle {

final private Class<?> fieldType;

final private Object staticBase;

final private long staticOffset;

private StaticAccessor(MethodType mtype, LambdaForm form, MemberName member,

Object staticBase, long staticOffset) {

super(mtype, form, member);

this.fieldType = member.getFieldType();

this.staticBase = staticBase;

this.staticOffset = staticOffset;

}

@Override Object checkCast(Object obj) {

return fieldType.cast(obj);

}

@Override

MethodHandle viewAsType(MethodType newType) {

return new StaticAccessor(newType, form, member, staticBase, staticOffset);

}

}

@ForceInline

/*non-public*/ static Object nullCheck(Object obj) {

obj.getClass();

return obj;

}

@ForceInline

/*non-public*/ static Object staticBase(Object accessorObj) {

return ((StaticAccessor)accessorObj).staticBase;

}

@ForceInline

/*non-public*/ static long staticOffset(Object accessorObj) {

return ((StaticAccessor)accessorObj).staticOffset;

}

@ForceInline

/*non-public*/ static Object checkCast(Object mh, Object obj) {

return ((DirectMethodHandle) mh).checkCast(obj);

}

Object checkCast(Object obj) {

return member.getReturnType().cast(obj);

}

// Caching machinery for field accessors:

private static byte

AF_GETFIELD = 0,

AF_PUTFIELD = 1,

AF_GETSTATIC = 2,

AF_PUTSTATIC = 3,

AF_GETSTATIC_INIT = 4,

AF_PUTSTATIC_INIT = 5,

AF_LIMIT = 6;

// Enumerate the different field kinds using Wrapper,

// with an extra case added for checked references.

private static int

FT_LAST_WRAPPER = Wrapper.values().length-1,

FT_UNCHECKED_REF = Wrapper.OBJECT.ordinal(),

FT_CHECKED_REF = FT_LAST_WRAPPER+1,

FT_LIMIT = FT_LAST_WRAPPER+2;

private static int afIndex(byte formOp, boolean isVolatile, int ftypeKind) {

return ((formOp * FT_LIMIT * 2)

+ (isVolatile ? FT_LIMIT : 0)

+ ftypeKind);

}

private static final LambdaForm[] ACCESSOR_FORMS

= new LambdaForm[afIndex(AF_LIMIT, false, 0)];

private static int ftypeKind(Class<?> ftype) {

if (ftype.isPrimitive())

return Wrapper.forPrimitiveType(ftype).ordinal();

else if (VerifyType.isNullReferenceConversion(Object.class, ftype))

return FT_UNCHECKED_REF;

else

return FT_CHECKED_REF;

}

/**

* Create a LF which can access the given field.

* Cache and share this structure among all fields with

* the same basicType and refKind.

*/

private static LambdaForm preparedFieldLambdaForm(MemberName m) {

Class<?> ftype = m.getFieldType();

boolean isVolatile = m.isVolatile();

byte formOp;

switch (m.getReferenceKind()) {

case REF_getField: formOp = AF_GETFIELD; break;

case REF_putField: formOp = AF_PUTFIELD; break;

case REF_getStatic: formOp = AF_GETSTATIC; break;

case REF_putStatic: formOp = AF_PUTSTATIC; break;

default: throw new InternalError(m.toString());

}

if (shouldBeInitialized(m)) {

// precompute the barrier-free version:

preparedFieldLambdaForm(formOp, isVolatile, ftype);

assert((AF_GETSTATIC_INIT - AF_GETSTATIC) ==

(AF_PUTSTATIC_INIT - AF_PUTSTATIC));

formOp += (AF_GETSTATIC_INIT - AF_GETSTATIC);

}

LambdaForm lform = preparedFieldLambdaForm(formOp, isVolatile, ftype);

maybeCompile(lform, m);

assert(lform.methodType().dropParameterTypes(0, 1)

.equals(m.getInvocationType().basicType()))

: Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());

return lform;

}

private static LambdaForm preparedFieldLambdaForm(byte formOp, boolean isVolatile, Class<?> ftype) {

int afIndex = afIndex(formOp, isVolatile, ftypeKind(ftype));

LambdaForm lform = ACCESSOR_FORMS[afIndex];

if (lform != null) return lform;

lform = makePreparedFieldLambdaForm(formOp, isVolatile, ftypeKind(ftype));

ACCESSOR_FORMS[afIndex] = lform; // don't bother with a CAS

return lform;

}

private static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {

boolean isGetter = (formOp & 1) == (AF_GETFIELD & 1);

boolean isStatic = (formOp >= AF_GETSTATIC);

boolean needsInit = (formOp >= AF_GETSTATIC_INIT);

boolean needsCast = (ftypeKind == FT_CHECKED_REF);

Wrapper fw = (needsCast ? Wrapper.OBJECT : Wrapper.values()[ftypeKind]);

Class<?> ft = fw.primitiveType();

assert(ftypeKind(needsCast ? String.class : ft) == ftypeKind);

String tname = fw.primitiveSimpleName();

String ctname = Character.toUpperCase(tname.charAt(0)) + tname.substring(1);

if (isVolatile) ctname += "Volatile";

String getOrPut = (isGetter ? "get" : "put");

String linkerName = (getOrPut + ctname); // getObject, putIntVolatile, etc.

MethodType linkerType;

if (isGetter)

linkerType = MethodType.methodType(ft, Object.class, long.class);

else

linkerType = MethodType.methodType(void.class, Object.class, long.class, ft);

MemberName linker = new MemberName(Unsafe.class, linkerName, linkerType, REF_invokeVirtual);

try {

linker = IMPL_NAMES.resolveOrFail(REF_invokeVirtual, linker, null, NoSuchMethodException.class);

} catch (ReflectiveOperationException ex) {

throw newInternalError(ex);

}

// What is the external type of the lambda form?

MethodType mtype;

if (isGetter)

mtype = MethodType.methodType(ft);

else

mtype = MethodType.methodType(void.class, ft);

mtype = mtype.basicType(); // erase short to int, etc.

if (!isStatic)

mtype = mtype.insertParameterTypes(0, Object.class);

final int DMH_THIS = 0;

final int ARG_BASE = 1;

final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();

// if this is for non-static access, the base pointer is stored at this index:

final int OBJ_BASE = isStatic ? -1 : ARG_BASE;

// if this is for write access, the value to be written is stored at this index:

final int SET_VALUE = isGetter ? -1 : ARG_LIMIT - 1;

int nameCursor = ARG_LIMIT;

final int F_HOLDER = (isStatic ? nameCursor++ : -1); // static base if any

final int F_OFFSET = nameCursor++; // Either static offset or field offset.

final int OBJ_CHECK = (OBJ_BASE >= 0 ? nameCursor++ : -1);

final int INIT_BAR = (needsInit ? nameCursor++ : -1);

final int PRE_CAST = (needsCast && !isGetter ? nameCursor++ : -1);

final int LINKER_CALL = nameCursor++;

final int POST_CAST = (needsCast && isGetter ? nameCursor++ : -1);

final int RESULT = nameCursor-1; // either the call or the cast

Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());

if (needsInit)

names[INIT_BAR] = new Name(Lazy.NF_ensureInitialized, names[DMH_THIS]);

if (needsCast && !isGetter)

names[PRE_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[SET_VALUE]);

Object[] outArgs = new Object[1 + linkerType.parameterCount()];

assert(outArgs.length == (isGetter ? 3 : 4));

outArgs[0] = UNSAFE;

if (isStatic) {

outArgs[1] = names[F_HOLDER] = new Name(Lazy.NF_staticBase, names[DMH_THIS]);

outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_staticOffset, names[DMH_THIS]);

} else {

outArgs[1] = names[OBJ_CHECK] = new Name(Lazy.NF_checkBase, names[OBJ_BASE]);

outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_fieldOffset, names[DMH_THIS]);

}

if (!isGetter) {

outArgs[3] = (needsCast ? names[PRE_CAST] : names[SET_VALUE]);

}

for (Object a : outArgs) assert(a != null);

names[LINKER_CALL] = new Name(linker, outArgs);

if (needsCast && isGetter)

names[POST_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[LINKER_CALL]);

for (Name n : names) assert(n != null);

String fieldOrStatic = (isStatic ? "Static" : "Field");

String lambdaName = (linkerName + fieldOrStatic); // significant only for debugging

if (needsCast) lambdaName += "Cast";

if (needsInit) lambdaName += "Init";

return new LambdaForm(lambdaName, ARG_LIMIT, names, RESULT);

}

/**

* Pre-initialized NamedFunctions for bootstrapping purposes.

* Factored in an inner class to delay initialization until first usage.

*/

private static class Lazy {

static final NamedFunction

NF_internalMemberName,

NF_internalMemberNameEnsureInit,

NF_ensureInitialized,

NF_fieldOffset,

NF_checkBase,

NF_staticBase,

NF_staticOffset,

NF_checkCast,

NF_allocateInstance,

NF_constructorMethod;

static {

try {

NamedFunction nfs[] = {

NF_internalMemberName = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("internalMemberName", Object.class)),

NF_internalMemberNameEnsureInit = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("internalMemberNameEnsureInit", Object.class)),

NF_ensureInitialized = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("ensureInitialized", Object.class)),

NF_fieldOffset = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("fieldOffset", Object.class)),

NF_checkBase = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("checkBase", Object.class)),

NF_staticBase = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("staticBase", Object.class)),

NF_staticOffset = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("staticOffset", Object.class)),

NF_checkCast = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("checkCast", Object.class, Object.class)),

NF_allocateInstance = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("allocateInstance", Object.class)),

NF_constructorMethod = new NamedFunction(DirectMethodHandle.class

.getDeclaredMethod("constructorMethod", Object.class))

};

for (NamedFunction nf : nfs) {

// Each nf must be statically invocable or we get tied up in our bootstraps.

assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf.member)) : nf;

nf.resolve();

}

} catch (ReflectiveOperationException ex) {

throw newInternalError(ex);

}

}

}

}