1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/emul/compact/src/main/java/java/lang/invoke/DirectMethodHandle.java Sat Aug 09 11:11:13 2014 +0200
1.3 @@ -0,0 +1,718 @@
1.4 +/*
1.5 + * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.lang.invoke;
1.30 +
1.31 +import sun.misc.Unsafe;
1.32 +import java.lang.reflect.Method;
1.33 +import java.util.Arrays;
1.34 +import sun.invoke.util.VerifyAccess;
1.35 +import static java.lang.invoke.MethodHandleNatives.Constants.*;
1.36 +import static java.lang.invoke.LambdaForm.*;
1.37 +import static java.lang.invoke.MethodTypeForm.*;
1.38 +import static java.lang.invoke.MethodHandleStatics.*;
1.39 +import java.lang.ref.WeakReference;
1.40 +import java.lang.reflect.Field;
1.41 +import sun.invoke.util.ValueConversions;
1.42 +import sun.invoke.util.VerifyType;
1.43 +import sun.invoke.util.Wrapper;
1.44 +
1.45 +/**
1.46 + * The flavor of method handle which implements a constant reference
1.47 + * to a class member.
1.48 + * @author jrose
1.49 + */
1.50 +class DirectMethodHandle extends MethodHandle {
1.51 + final MemberName member;
1.52 +
1.53 + // Constructors and factory methods in this class *must* be package scoped or private.
1.54 + private DirectMethodHandle(MethodType mtype, LambdaForm form, MemberName member) {
1.55 + super(mtype, form);
1.56 + if (!member.isResolved()) throw new InternalError();
1.57 +
1.58 + if (member.getDeclaringClass().isInterface() &&
1.59 + member.isMethod() && !member.isAbstract()) {
1.60 + // Check for corner case: invokeinterface of Object method
1.61 + MemberName m = new MemberName(Object.class, member.getName(), member.getMethodType(), member.getReferenceKind());
1.62 + m = MemberName.getFactory().resolveOrNull(m.getReferenceKind(), m, null);
1.63 + if (m != null && m.isPublic()) {
1.64 + member = m;
1.65 + }
1.66 + }
1.67 +
1.68 + this.member = member;
1.69 + }
1.70 +
1.71 + // Factory methods:
1.72 + static DirectMethodHandle make(byte refKind, Class<?> receiver, MemberName member) {
1.73 + MethodType mtype = member.getMethodOrFieldType();
1.74 + if (!member.isStatic()) {
1.75 + if (!member.getDeclaringClass().isAssignableFrom(receiver) || member.isConstructor())
1.76 + throw new InternalError(member.toString());
1.77 + mtype = mtype.insertParameterTypes(0, receiver);
1.78 + }
1.79 + if (!member.isField()) {
1.80 + if (refKind == REF_invokeSpecial) {
1.81 + member = member.asSpecial();
1.82 + LambdaForm lform = preparedLambdaForm(member);
1.83 + return new Special(mtype, lform, member);
1.84 + } else {
1.85 + LambdaForm lform = preparedLambdaForm(member);
1.86 + return new DirectMethodHandle(mtype, lform, member);
1.87 + }
1.88 + } else {
1.89 + LambdaForm lform = preparedFieldLambdaForm(member);
1.90 + if (member.isStatic()) {
1.91 + long offset = MethodHandleNatives.staticFieldOffset(member);
1.92 + Object base = MethodHandleNatives.staticFieldBase(member);
1.93 + return new StaticAccessor(mtype, lform, member, base, offset);
1.94 + } else {
1.95 + long offset = MethodHandleNatives.objectFieldOffset(member);
1.96 + assert(offset == (int)offset);
1.97 + return new Accessor(mtype, lform, member, (int)offset);
1.98 + }
1.99 + }
1.100 + }
1.101 + static DirectMethodHandle make(Class<?> receiver, MemberName member) {
1.102 + byte refKind = member.getReferenceKind();
1.103 + if (refKind == REF_invokeSpecial)
1.104 + refKind = REF_invokeVirtual;
1.105 + return make(refKind, receiver, member);
1.106 + }
1.107 + static DirectMethodHandle make(MemberName member) {
1.108 + if (member.isConstructor())
1.109 + return makeAllocator(member);
1.110 + return make(member.getDeclaringClass(), member);
1.111 + }
1.112 + static DirectMethodHandle make(Method method) {
1.113 + return make(method.getDeclaringClass(), new MemberName(method));
1.114 + }
1.115 + static DirectMethodHandle make(Field field) {
1.116 + return make(field.getDeclaringClass(), new MemberName(field));
1.117 + }
1.118 + private static DirectMethodHandle makeAllocator(MemberName ctor) {
1.119 + assert(ctor.isConstructor() && ctor.getName().equals("<init>"));
1.120 + Class<?> instanceClass = ctor.getDeclaringClass();
1.121 + ctor = ctor.asConstructor();
1.122 + assert(ctor.isConstructor() && ctor.getReferenceKind() == REF_newInvokeSpecial) : ctor;
1.123 + MethodType mtype = ctor.getMethodType().changeReturnType(instanceClass);
1.124 + LambdaForm lform = preparedLambdaForm(ctor);
1.125 + MemberName init = ctor.asSpecial();
1.126 + assert(init.getMethodType().returnType() == void.class);
1.127 + return new Constructor(mtype, lform, ctor, init, instanceClass);
1.128 + }
1.129 +
1.130 + @Override
1.131 + MethodHandle copyWith(MethodType mt, LambdaForm lf) {
1.132 + return new DirectMethodHandle(mt, lf, member);
1.133 + }
1.134 +
1.135 + @Override
1.136 + String internalProperties() {
1.137 + return "/DMH="+member.toString();
1.138 + }
1.139 +
1.140 + //// Implementation methods.
1.141 + @Override
1.142 + MethodHandle viewAsType(MethodType newType) {
1.143 + return new DirectMethodHandle(newType, form, member);
1.144 + }
1.145 + @Override
1.146 + @ForceInline
1.147 + MemberName internalMemberName() {
1.148 + return member;
1.149 + }
1.150 +
1.151 + @Override
1.152 + MethodHandle bindArgument(int pos, char basicType, Object value) {
1.153 + // If the member needs dispatching, do so.
1.154 + if (pos == 0 && basicType == 'L') {
1.155 + DirectMethodHandle concrete = maybeRebind(value);
1.156 + if (concrete != null)
1.157 + return concrete.bindReceiver(value);
1.158 + }
1.159 + return super.bindArgument(pos, basicType, value);
1.160 + }
1.161 +
1.162 + @Override
1.163 + MethodHandle bindReceiver(Object receiver) {
1.164 + // If the member needs dispatching, do so.
1.165 + DirectMethodHandle concrete = maybeRebind(receiver);
1.166 + if (concrete != null)
1.167 + return concrete.bindReceiver(receiver);
1.168 + return super.bindReceiver(receiver);
1.169 + }
1.170 +
1.171 + private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory();
1.172 +
1.173 + private DirectMethodHandle maybeRebind(Object receiver) {
1.174 + if (receiver != null) {
1.175 + switch (member.getReferenceKind()) {
1.176 + case REF_invokeInterface:
1.177 + case REF_invokeVirtual:
1.178 + // Pre-dispatch the member.
1.179 + Class<?> concreteClass = receiver.getClass();
1.180 + MemberName concrete = new MemberName(concreteClass, member.getName(), member.getMethodType(), REF_invokeSpecial);
1.181 + concrete = IMPL_NAMES.resolveOrNull(REF_invokeSpecial, concrete, concreteClass);
1.182 + if (concrete != null)
1.183 + return new DirectMethodHandle(type(), preparedLambdaForm(concrete), concrete);
1.184 + break;
1.185 + }
1.186 + }
1.187 + return null;
1.188 + }
1.189 +
1.190 + /**
1.191 + * Create a LF which can invoke the given method.
1.192 + * Cache and share this structure among all methods with
1.193 + * the same basicType and refKind.
1.194 + */
1.195 + private static LambdaForm preparedLambdaForm(MemberName m) {
1.196 + assert(m.isInvocable()) : m; // call preparedFieldLambdaForm instead
1.197 + MethodType mtype = m.getInvocationType().basicType();
1.198 + assert(!m.isMethodHandleInvoke() || "invokeBasic".equals(m.getName())) : m;
1.199 + int which;
1.200 + switch (m.getReferenceKind()) {
1.201 + case REF_invokeVirtual: which = LF_INVVIRTUAL; break;
1.202 + case REF_invokeStatic: which = LF_INVSTATIC; break;
1.203 + case REF_invokeSpecial: which = LF_INVSPECIAL; break;
1.204 + case REF_invokeInterface: which = LF_INVINTERFACE; break;
1.205 + case REF_newInvokeSpecial: which = LF_NEWINVSPECIAL; break;
1.206 + default: throw new InternalError(m.toString());
1.207 + }
1.208 + if (which == LF_INVSTATIC && shouldBeInitialized(m)) {
1.209 + // precompute the barrier-free version:
1.210 + preparedLambdaForm(mtype, which);
1.211 + which = LF_INVSTATIC_INIT;
1.212 + }
1.213 + LambdaForm lform = preparedLambdaForm(mtype, which);
1.214 + maybeCompile(lform, m);
1.215 + assert(lform.methodType().dropParameterTypes(0, 1)
1.216 + .equals(m.getInvocationType().basicType()))
1.217 + : Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());
1.218 + return lform;
1.219 + }
1.220 +
1.221 + private static LambdaForm preparedLambdaForm(MethodType mtype, int which) {
1.222 + LambdaForm lform = mtype.form().cachedLambdaForm(which);
1.223 + if (lform != null) return lform;
1.224 + lform = makePreparedLambdaForm(mtype, which);
1.225 + return mtype.form().setCachedLambdaForm(which, lform);
1.226 + }
1.227 +
1.228 + private static LambdaForm makePreparedLambdaForm(MethodType mtype, int which) {
1.229 + boolean needsInit = (which == LF_INVSTATIC_INIT);
1.230 + boolean doesAlloc = (which == LF_NEWINVSPECIAL);
1.231 + String linkerName, lambdaName;
1.232 + switch (which) {
1.233 + case LF_INVVIRTUAL: linkerName = "linkToVirtual"; lambdaName = "DMH.invokeVirtual"; break;
1.234 + case LF_INVSTATIC: linkerName = "linkToStatic"; lambdaName = "DMH.invokeStatic"; break;
1.235 + case LF_INVSTATIC_INIT:linkerName = "linkToStatic"; lambdaName = "DMH.invokeStaticInit"; break;
1.236 + case LF_INVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.invokeSpecial"; break;
1.237 + case LF_INVINTERFACE: linkerName = "linkToInterface"; lambdaName = "DMH.invokeInterface"; break;
1.238 + case LF_NEWINVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.newInvokeSpecial"; break;
1.239 + default: throw new InternalError("which="+which);
1.240 + }
1.241 + MethodType mtypeWithArg = mtype.appendParameterTypes(MemberName.class);
1.242 + if (doesAlloc)
1.243 + mtypeWithArg = mtypeWithArg
1.244 + .insertParameterTypes(0, Object.class) // insert newly allocated obj
1.245 + .changeReturnType(void.class); // <init> returns void
1.246 + MemberName linker = new MemberName(MethodHandle.class, linkerName, mtypeWithArg, REF_invokeStatic);
1.247 + try {
1.248 + linker = IMPL_NAMES.resolveOrFail(REF_invokeStatic, linker, null, NoSuchMethodException.class);
1.249 + } catch (ReflectiveOperationException ex) {
1.250 + throw newInternalError(ex);
1.251 + }
1.252 + final int DMH_THIS = 0;
1.253 + final int ARG_BASE = 1;
1.254 + final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
1.255 + int nameCursor = ARG_LIMIT;
1.256 + final int NEW_OBJ = (doesAlloc ? nameCursor++ : -1);
1.257 + final int GET_MEMBER = nameCursor++;
1.258 + final int LINKER_CALL = nameCursor++;
1.259 + Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
1.260 + assert(names.length == nameCursor);
1.261 + if (doesAlloc) {
1.262 + // names = { argx,y,z,... new C, init method }
1.263 + names[NEW_OBJ] = new Name(Lazy.NF_allocateInstance, names[DMH_THIS]);
1.264 + names[GET_MEMBER] = new Name(Lazy.NF_constructorMethod, names[DMH_THIS]);
1.265 + } else if (needsInit) {
1.266 + names[GET_MEMBER] = new Name(Lazy.NF_internalMemberNameEnsureInit, names[DMH_THIS]);
1.267 + } else {
1.268 + names[GET_MEMBER] = new Name(Lazy.NF_internalMemberName, names[DMH_THIS]);
1.269 + }
1.270 + Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, GET_MEMBER+1, Object[].class);
1.271 + assert(outArgs[outArgs.length-1] == names[GET_MEMBER]); // look, shifted args!
1.272 + int result = LambdaForm.LAST_RESULT;
1.273 + if (doesAlloc) {
1.274 + assert(outArgs[outArgs.length-2] == names[NEW_OBJ]); // got to move this one
1.275 + System.arraycopy(outArgs, 0, outArgs, 1, outArgs.length-2);
1.276 + outArgs[0] = names[NEW_OBJ];
1.277 + result = NEW_OBJ;
1.278 + }
1.279 + names[LINKER_CALL] = new Name(linker, outArgs);
1.280 + lambdaName += "_" + LambdaForm.basicTypeSignature(mtype);
1.281 + LambdaForm lform = new LambdaForm(lambdaName, ARG_LIMIT, names, result);
1.282 + // This is a tricky bit of code. Don't send it through the LF interpreter.
1.283 + lform.compileToBytecode();
1.284 + return lform;
1.285 + }
1.286 +
1.287 + private static void maybeCompile(LambdaForm lform, MemberName m) {
1.288 + if (VerifyAccess.isSamePackage(m.getDeclaringClass(), MethodHandle.class))
1.289 + // Help along bootstrapping...
1.290 + lform.compileToBytecode();
1.291 + }
1.292 +
1.293 + /** Static wrapper for DirectMethodHandle.internalMemberName. */
1.294 + @ForceInline
1.295 + /*non-public*/ static Object internalMemberName(Object mh) {
1.296 + return ((DirectMethodHandle)mh).member;
1.297 + }
1.298 +
1.299 + /** Static wrapper for DirectMethodHandle.internalMemberName.
1.300 + * This one also forces initialization.
1.301 + */
1.302 + /*non-public*/ static Object internalMemberNameEnsureInit(Object mh) {
1.303 + DirectMethodHandle dmh = (DirectMethodHandle)mh;
1.304 + dmh.ensureInitialized();
1.305 + return dmh.member;
1.306 + }
1.307 +
1.308 + /*non-public*/ static
1.309 + boolean shouldBeInitialized(MemberName member) {
1.310 + switch (member.getReferenceKind()) {
1.311 + case REF_invokeStatic:
1.312 + case REF_getStatic:
1.313 + case REF_putStatic:
1.314 + case REF_newInvokeSpecial:
1.315 + break;
1.316 + default:
1.317 + // No need to initialize the class on this kind of member.
1.318 + return false;
1.319 + }
1.320 + Class<?> cls = member.getDeclaringClass();
1.321 + if (cls == ValueConversions.class ||
1.322 + cls == MethodHandleImpl.class ||
1.323 + cls == Invokers.class) {
1.324 + // These guys have lots of <clinit> DMH creation but we know
1.325 + // the MHs will not be used until the system is booted.
1.326 + return false;
1.327 + }
1.328 + if (VerifyAccess.isSamePackage(MethodHandle.class, cls) ||
1.329 + VerifyAccess.isSamePackage(ValueConversions.class, cls)) {
1.330 + // It is a system class. It is probably in the process of
1.331 + // being initialized, but we will help it along just to be safe.
1.332 + if (UNSAFE.shouldBeInitialized(cls)) {
1.333 + UNSAFE.ensureClassInitialized(cls);
1.334 + }
1.335 + return false;
1.336 + }
1.337 + return UNSAFE.shouldBeInitialized(cls);
1.338 + }
1.339 +
1.340 + private static class EnsureInitialized extends ClassValue<WeakReference<Thread>> {
1.341 + @Override
1.342 + protected WeakReference<Thread> computeValue(Class<?> type) {
1.343 + UNSAFE.ensureClassInitialized(type);
1.344 + if (UNSAFE.shouldBeInitialized(type))
1.345 + // If the previous call didn't block, this can happen.
1.346 + // We are executing inside <clinit>.
1.347 + return new WeakReference<>(Thread.currentThread());
1.348 + return null;
1.349 + }
1.350 + static final EnsureInitialized INSTANCE = new EnsureInitialized();
1.351 + }
1.352 +
1.353 + private void ensureInitialized() {
1.354 + if (checkInitialized(member)) {
1.355 + // The coast is clear. Delete the <clinit> barrier.
1.356 + if (member.isField())
1.357 + updateForm(preparedFieldLambdaForm(member));
1.358 + else
1.359 + updateForm(preparedLambdaForm(member));
1.360 + }
1.361 + }
1.362 + private static boolean checkInitialized(MemberName member) {
1.363 + Class<?> defc = member.getDeclaringClass();
1.364 + WeakReference<Thread> ref = EnsureInitialized.INSTANCE.get(defc);
1.365 + if (ref == null) {
1.366 + return true; // the final state
1.367 + }
1.368 + Thread clinitThread = ref.get();
1.369 + // Somebody may still be running defc.<clinit>.
1.370 + if (clinitThread == Thread.currentThread()) {
1.371 + // If anybody is running defc.<clinit>, it is this thread.
1.372 + if (UNSAFE.shouldBeInitialized(defc))
1.373 + // Yes, we are running it; keep the barrier for now.
1.374 + return false;
1.375 + } else {
1.376 + // We are in a random thread. Block.
1.377 + UNSAFE.ensureClassInitialized(defc);
1.378 + }
1.379 + assert(!UNSAFE.shouldBeInitialized(defc));
1.380 + // put it into the final state
1.381 + EnsureInitialized.INSTANCE.remove(defc);
1.382 + return true;
1.383 + }
1.384 +
1.385 + /*non-public*/ static void ensureInitialized(Object mh) {
1.386 + ((DirectMethodHandle)mh).ensureInitialized();
1.387 + }
1.388 +
1.389 + /** This subclass represents invokespecial instructions. */
1.390 + static class Special extends DirectMethodHandle {
1.391 + private Special(MethodType mtype, LambdaForm form, MemberName member) {
1.392 + super(mtype, form, member);
1.393 + }
1.394 + @Override
1.395 + boolean isInvokeSpecial() {
1.396 + return true;
1.397 + }
1.398 + @Override
1.399 + MethodHandle viewAsType(MethodType newType) {
1.400 + return new Special(newType, form, member);
1.401 + }
1.402 + }
1.403 +
1.404 + /** This subclass handles constructor references. */
1.405 + static class Constructor extends DirectMethodHandle {
1.406 + final MemberName initMethod;
1.407 + final Class<?> instanceClass;
1.408 +
1.409 + private Constructor(MethodType mtype, LambdaForm form, MemberName constructor,
1.410 + MemberName initMethod, Class<?> instanceClass) {
1.411 + super(mtype, form, constructor);
1.412 + this.initMethod = initMethod;
1.413 + this.instanceClass = instanceClass;
1.414 + assert(initMethod.isResolved());
1.415 + }
1.416 + @Override
1.417 + MethodHandle viewAsType(MethodType newType) {
1.418 + return new Constructor(newType, form, member, initMethod, instanceClass);
1.419 + }
1.420 + }
1.421 +
1.422 + /*non-public*/ static Object constructorMethod(Object mh) {
1.423 + Constructor dmh = (Constructor)mh;
1.424 + return dmh.initMethod;
1.425 + }
1.426 +
1.427 + /*non-public*/ static Object allocateInstance(Object mh) throws InstantiationException {
1.428 + Constructor dmh = (Constructor)mh;
1.429 + return UNSAFE.allocateInstance(dmh.instanceClass);
1.430 + }
1.431 +
1.432 + /** This subclass handles non-static field references. */
1.433 + static class Accessor extends DirectMethodHandle {
1.434 + final Class<?> fieldType;
1.435 + final int fieldOffset;
1.436 + private Accessor(MethodType mtype, LambdaForm form, MemberName member,
1.437 + int fieldOffset) {
1.438 + super(mtype, form, member);
1.439 + this.fieldType = member.getFieldType();
1.440 + this.fieldOffset = fieldOffset;
1.441 + }
1.442 +
1.443 + @Override Object checkCast(Object obj) {
1.444 + return fieldType.cast(obj);
1.445 + }
1.446 + @Override
1.447 + MethodHandle viewAsType(MethodType newType) {
1.448 + return new Accessor(newType, form, member, fieldOffset);
1.449 + }
1.450 + }
1.451 +
1.452 + @ForceInline
1.453 + /*non-public*/ static long fieldOffset(Object accessorObj) {
1.454 + // Note: We return a long because that is what Unsafe.getObject likes.
1.455 + // We store a plain int because it is more compact.
1.456 + return ((Accessor)accessorObj).fieldOffset;
1.457 + }
1.458 +
1.459 + @ForceInline
1.460 + /*non-public*/ static Object checkBase(Object obj) {
1.461 + // Note that the object's class has already been verified,
1.462 + // since the parameter type of the Accessor method handle
1.463 + // is either member.getDeclaringClass or a subclass.
1.464 + // This was verified in DirectMethodHandle.make.
1.465 + // Therefore, the only remaining check is for null.
1.466 + // Since this check is *not* guaranteed by Unsafe.getInt
1.467 + // and its siblings, we need to make an explicit one here.
1.468 + obj.getClass(); // maybe throw NPE
1.469 + return obj;
1.470 + }
1.471 +
1.472 + /** This subclass handles static field references. */
1.473 + static class StaticAccessor extends DirectMethodHandle {
1.474 + final private Class<?> fieldType;
1.475 + final private Object staticBase;
1.476 + final private long staticOffset;
1.477 +
1.478 + private StaticAccessor(MethodType mtype, LambdaForm form, MemberName member,
1.479 + Object staticBase, long staticOffset) {
1.480 + super(mtype, form, member);
1.481 + this.fieldType = member.getFieldType();
1.482 + this.staticBase = staticBase;
1.483 + this.staticOffset = staticOffset;
1.484 + }
1.485 +
1.486 + @Override Object checkCast(Object obj) {
1.487 + return fieldType.cast(obj);
1.488 + }
1.489 + @Override
1.490 + MethodHandle viewAsType(MethodType newType) {
1.491 + return new StaticAccessor(newType, form, member, staticBase, staticOffset);
1.492 + }
1.493 + }
1.494 +
1.495 + @ForceInline
1.496 + /*non-public*/ static Object nullCheck(Object obj) {
1.497 + obj.getClass();
1.498 + return obj;
1.499 + }
1.500 +
1.501 + @ForceInline
1.502 + /*non-public*/ static Object staticBase(Object accessorObj) {
1.503 + return ((StaticAccessor)accessorObj).staticBase;
1.504 + }
1.505 +
1.506 + @ForceInline
1.507 + /*non-public*/ static long staticOffset(Object accessorObj) {
1.508 + return ((StaticAccessor)accessorObj).staticOffset;
1.509 + }
1.510 +
1.511 + @ForceInline
1.512 + /*non-public*/ static Object checkCast(Object mh, Object obj) {
1.513 + return ((DirectMethodHandle) mh).checkCast(obj);
1.514 + }
1.515 +
1.516 + Object checkCast(Object obj) {
1.517 + return member.getReturnType().cast(obj);
1.518 + }
1.519 +
1.520 + // Caching machinery for field accessors:
1.521 + private static byte
1.522 + AF_GETFIELD = 0,
1.523 + AF_PUTFIELD = 1,
1.524 + AF_GETSTATIC = 2,
1.525 + AF_PUTSTATIC = 3,
1.526 + AF_GETSTATIC_INIT = 4,
1.527 + AF_PUTSTATIC_INIT = 5,
1.528 + AF_LIMIT = 6;
1.529 + // Enumerate the different field kinds using Wrapper,
1.530 + // with an extra case added for checked references.
1.531 + private static int
1.532 + FT_LAST_WRAPPER = Wrapper.values().length-1,
1.533 + FT_UNCHECKED_REF = Wrapper.OBJECT.ordinal(),
1.534 + FT_CHECKED_REF = FT_LAST_WRAPPER+1,
1.535 + FT_LIMIT = FT_LAST_WRAPPER+2;
1.536 + private static int afIndex(byte formOp, boolean isVolatile, int ftypeKind) {
1.537 + return ((formOp * FT_LIMIT * 2)
1.538 + + (isVolatile ? FT_LIMIT : 0)
1.539 + + ftypeKind);
1.540 + }
1.541 + private static final LambdaForm[] ACCESSOR_FORMS
1.542 + = new LambdaForm[afIndex(AF_LIMIT, false, 0)];
1.543 + private static int ftypeKind(Class<?> ftype) {
1.544 + if (ftype.isPrimitive())
1.545 + return Wrapper.forPrimitiveType(ftype).ordinal();
1.546 + else if (VerifyType.isNullReferenceConversion(Object.class, ftype))
1.547 + return FT_UNCHECKED_REF;
1.548 + else
1.549 + return FT_CHECKED_REF;
1.550 + }
1.551 +
1.552 + /**
1.553 + * Create a LF which can access the given field.
1.554 + * Cache and share this structure among all fields with
1.555 + * the same basicType and refKind.
1.556 + */
1.557 + private static LambdaForm preparedFieldLambdaForm(MemberName m) {
1.558 + Class<?> ftype = m.getFieldType();
1.559 + boolean isVolatile = m.isVolatile();
1.560 + byte formOp;
1.561 + switch (m.getReferenceKind()) {
1.562 + case REF_getField: formOp = AF_GETFIELD; break;
1.563 + case REF_putField: formOp = AF_PUTFIELD; break;
1.564 + case REF_getStatic: formOp = AF_GETSTATIC; break;
1.565 + case REF_putStatic: formOp = AF_PUTSTATIC; break;
1.566 + default: throw new InternalError(m.toString());
1.567 + }
1.568 + if (shouldBeInitialized(m)) {
1.569 + // precompute the barrier-free version:
1.570 + preparedFieldLambdaForm(formOp, isVolatile, ftype);
1.571 + assert((AF_GETSTATIC_INIT - AF_GETSTATIC) ==
1.572 + (AF_PUTSTATIC_INIT - AF_PUTSTATIC));
1.573 + formOp += (AF_GETSTATIC_INIT - AF_GETSTATIC);
1.574 + }
1.575 + LambdaForm lform = preparedFieldLambdaForm(formOp, isVolatile, ftype);
1.576 + maybeCompile(lform, m);
1.577 + assert(lform.methodType().dropParameterTypes(0, 1)
1.578 + .equals(m.getInvocationType().basicType()))
1.579 + : Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());
1.580 + return lform;
1.581 + }
1.582 + private static LambdaForm preparedFieldLambdaForm(byte formOp, boolean isVolatile, Class<?> ftype) {
1.583 + int afIndex = afIndex(formOp, isVolatile, ftypeKind(ftype));
1.584 + LambdaForm lform = ACCESSOR_FORMS[afIndex];
1.585 + if (lform != null) return lform;
1.586 + lform = makePreparedFieldLambdaForm(formOp, isVolatile, ftypeKind(ftype));
1.587 + ACCESSOR_FORMS[afIndex] = lform; // don't bother with a CAS
1.588 + return lform;
1.589 + }
1.590 +
1.591 + private static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {
1.592 + boolean isGetter = (formOp & 1) == (AF_GETFIELD & 1);
1.593 + boolean isStatic = (formOp >= AF_GETSTATIC);
1.594 + boolean needsInit = (formOp >= AF_GETSTATIC_INIT);
1.595 + boolean needsCast = (ftypeKind == FT_CHECKED_REF);
1.596 + Wrapper fw = (needsCast ? Wrapper.OBJECT : Wrapper.values()[ftypeKind]);
1.597 + Class<?> ft = fw.primitiveType();
1.598 + assert(ftypeKind(needsCast ? String.class : ft) == ftypeKind);
1.599 + String tname = fw.primitiveSimpleName();
1.600 + String ctname = Character.toUpperCase(tname.charAt(0)) + tname.substring(1);
1.601 + if (isVolatile) ctname += "Volatile";
1.602 + String getOrPut = (isGetter ? "get" : "put");
1.603 + String linkerName = (getOrPut + ctname); // getObject, putIntVolatile, etc.
1.604 + MethodType linkerType;
1.605 + if (isGetter)
1.606 + linkerType = MethodType.methodType(ft, Object.class, long.class);
1.607 + else
1.608 + linkerType = MethodType.methodType(void.class, Object.class, long.class, ft);
1.609 + MemberName linker = new MemberName(Unsafe.class, linkerName, linkerType, REF_invokeVirtual);
1.610 + try {
1.611 + linker = IMPL_NAMES.resolveOrFail(REF_invokeVirtual, linker, null, NoSuchMethodException.class);
1.612 + } catch (ReflectiveOperationException ex) {
1.613 + throw newInternalError(ex);
1.614 + }
1.615 +
1.616 + // What is the external type of the lambda form?
1.617 + MethodType mtype;
1.618 + if (isGetter)
1.619 + mtype = MethodType.methodType(ft);
1.620 + else
1.621 + mtype = MethodType.methodType(void.class, ft);
1.622 + mtype = mtype.basicType(); // erase short to int, etc.
1.623 + if (!isStatic)
1.624 + mtype = mtype.insertParameterTypes(0, Object.class);
1.625 + final int DMH_THIS = 0;
1.626 + final int ARG_BASE = 1;
1.627 + final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
1.628 + // if this is for non-static access, the base pointer is stored at this index:
1.629 + final int OBJ_BASE = isStatic ? -1 : ARG_BASE;
1.630 + // if this is for write access, the value to be written is stored at this index:
1.631 + final int SET_VALUE = isGetter ? -1 : ARG_LIMIT - 1;
1.632 + int nameCursor = ARG_LIMIT;
1.633 + final int F_HOLDER = (isStatic ? nameCursor++ : -1); // static base if any
1.634 + final int F_OFFSET = nameCursor++; // Either static offset or field offset.
1.635 + final int OBJ_CHECK = (OBJ_BASE >= 0 ? nameCursor++ : -1);
1.636 + final int INIT_BAR = (needsInit ? nameCursor++ : -1);
1.637 + final int PRE_CAST = (needsCast && !isGetter ? nameCursor++ : -1);
1.638 + final int LINKER_CALL = nameCursor++;
1.639 + final int POST_CAST = (needsCast && isGetter ? nameCursor++ : -1);
1.640 + final int RESULT = nameCursor-1; // either the call or the cast
1.641 + Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
1.642 + if (needsInit)
1.643 + names[INIT_BAR] = new Name(Lazy.NF_ensureInitialized, names[DMH_THIS]);
1.644 + if (needsCast && !isGetter)
1.645 + names[PRE_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[SET_VALUE]);
1.646 + Object[] outArgs = new Object[1 + linkerType.parameterCount()];
1.647 + assert(outArgs.length == (isGetter ? 3 : 4));
1.648 + outArgs[0] = UNSAFE;
1.649 + if (isStatic) {
1.650 + outArgs[1] = names[F_HOLDER] = new Name(Lazy.NF_staticBase, names[DMH_THIS]);
1.651 + outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_staticOffset, names[DMH_THIS]);
1.652 + } else {
1.653 + outArgs[1] = names[OBJ_CHECK] = new Name(Lazy.NF_checkBase, names[OBJ_BASE]);
1.654 + outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_fieldOffset, names[DMH_THIS]);
1.655 + }
1.656 + if (!isGetter) {
1.657 + outArgs[3] = (needsCast ? names[PRE_CAST] : names[SET_VALUE]);
1.658 + }
1.659 + for (Object a : outArgs) assert(a != null);
1.660 + names[LINKER_CALL] = new Name(linker, outArgs);
1.661 + if (needsCast && isGetter)
1.662 + names[POST_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[LINKER_CALL]);
1.663 + for (Name n : names) assert(n != null);
1.664 + String fieldOrStatic = (isStatic ? "Static" : "Field");
1.665 + String lambdaName = (linkerName + fieldOrStatic); // significant only for debugging
1.666 + if (needsCast) lambdaName += "Cast";
1.667 + if (needsInit) lambdaName += "Init";
1.668 + return new LambdaForm(lambdaName, ARG_LIMIT, names, RESULT);
1.669 + }
1.670 +
1.671 + /**
1.672 + * Pre-initialized NamedFunctions for bootstrapping purposes.
1.673 + * Factored in an inner class to delay initialization until first usage.
1.674 + */
1.675 + private static class Lazy {
1.676 + static final NamedFunction
1.677 + NF_internalMemberName,
1.678 + NF_internalMemberNameEnsureInit,
1.679 + NF_ensureInitialized,
1.680 + NF_fieldOffset,
1.681 + NF_checkBase,
1.682 + NF_staticBase,
1.683 + NF_staticOffset,
1.684 + NF_checkCast,
1.685 + NF_allocateInstance,
1.686 + NF_constructorMethod;
1.687 + static {
1.688 + try {
1.689 + NamedFunction nfs[] = {
1.690 + NF_internalMemberName = new NamedFunction(DirectMethodHandle.class
1.691 + .getDeclaredMethod("internalMemberName", Object.class)),
1.692 + NF_internalMemberNameEnsureInit = new NamedFunction(DirectMethodHandle.class
1.693 + .getDeclaredMethod("internalMemberNameEnsureInit", Object.class)),
1.694 + NF_ensureInitialized = new NamedFunction(DirectMethodHandle.class
1.695 + .getDeclaredMethod("ensureInitialized", Object.class)),
1.696 + NF_fieldOffset = new NamedFunction(DirectMethodHandle.class
1.697 + .getDeclaredMethod("fieldOffset", Object.class)),
1.698 + NF_checkBase = new NamedFunction(DirectMethodHandle.class
1.699 + .getDeclaredMethod("checkBase", Object.class)),
1.700 + NF_staticBase = new NamedFunction(DirectMethodHandle.class
1.701 + .getDeclaredMethod("staticBase", Object.class)),
1.702 + NF_staticOffset = new NamedFunction(DirectMethodHandle.class
1.703 + .getDeclaredMethod("staticOffset", Object.class)),
1.704 + NF_checkCast = new NamedFunction(DirectMethodHandle.class
1.705 + .getDeclaredMethod("checkCast", Object.class, Object.class)),
1.706 + NF_allocateInstance = new NamedFunction(DirectMethodHandle.class
1.707 + .getDeclaredMethod("allocateInstance", Object.class)),
1.708 + NF_constructorMethod = new NamedFunction(DirectMethodHandle.class
1.709 + .getDeclaredMethod("constructorMethod", Object.class))
1.710 + };
1.711 + for (NamedFunction nf : nfs) {
1.712 + // Each nf must be statically invocable or we get tied up in our bootstraps.
1.713 + assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf.member)) : nf;
1.714 + nf.resolve();
1.715 + }
1.716 + } catch (ReflectiveOperationException ex) {
1.717 + throw newInternalError(ex);
1.718 + }
1.719 + }
1.720 + }
1.721 +}