diff -r eca8e9c3ec3e -r cd50c1894ce5 rt/emul/compact/src/main/java/java/lang/invoke/DirectMethodHandle.java --- a/rt/emul/compact/src/main/java/java/lang/invoke/DirectMethodHandle.java Sun Aug 17 20:09:05 2014 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,730 +0,0 @@ -/* - * 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 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 (shouldBeInitialized(cls)) { - ensureClassInitialized(cls); - } - return false; - } - return shouldBeInitialized(cls); - } - - private static class EnsureInitialized extends ClassValue> { - @Override - protected WeakReference computeValue(Class type) { - ensureClassInitialized(type); - if (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 (shouldBeInitialized(defc)) - // Yes, we are running it; keep the barrier for now. - return false; - } else { - // We are in a random thread. Block. - ensureClassInitialized(defc); - } - assert(!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; - try { - return dmh.instanceClass.newInstance(); -// return UNSAFE.allocateInstance(dmh.instanceClass); - } catch (IllegalAccessException ex) { - throw (InstantiationException)new InstantiationException().initCause(ex); - } - } - - /** 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 = null;//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); - } - } - } - - private static boolean shouldBeInitialized(Class c) { - return false; - } - - private static void ensureClassInitialized(Class c) { - c.getName(); - } -}