diff -r 000000000000 -r c880a8a8803b rt/emul/compact/src/main/java/java/lang/invoke/DirectMethodHandle.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rt/emul/compact/src/main/java/java/lang/invoke/DirectMethodHandle.java Sat Aug 09 11:11:13 2014 +0200 @@ -0,0 +1,718 @@ +/* + * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +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("")); + 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); // 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 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> { + @Override + protected WeakReference computeValue(Class type) { + UNSAFE.ensureClassInitialized(type); + if (UNSAFE.shouldBeInitialized(type)) + // If the previous call didn't block, this can happen. + // We are executing inside . + 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 barrier. + if (member.isField()) + updateForm(preparedFieldLambdaForm(member)); + else + updateForm(preparedLambdaForm(member)); + } + } + private static boolean checkInitialized(MemberName member) { + Class defc = member.getDeclaringClass(); + WeakReference ref = EnsureInitialized.INSTANCE.get(defc); + if (ref == null) { + return true; // the final state + } + Thread clinitThread = ref.get(); + // Somebody may still be running defc.. + if (clinitThread == Thread.currentThread()) { + // If anybody is running defc., 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); + } + } + } +}