--- a/jdk/src/share/classes/java/lang/invoke/BoundMethodHandle.java Thu Jul 12 00:12:52 2012 -0700
+++ b/jdk/src/share/classes/java/lang/invoke/BoundMethodHandle.java Tue Jul 24 10:47:44 2012 -0700
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2012, 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
@@ -25,164 +25,828 @@
package java.lang.invoke;
-import sun.invoke.util.VerifyType;
+import static com.sun.xml.internal.ws.org.objectweb.asm.Opcodes.*;
+import static java.lang.invoke.LambdaForm.basicTypes;
+import static java.lang.invoke.MethodHandleNatives.Constants.REF_invokeStatic;
+import static java.lang.invoke.MethodHandleStatics.*;
+
+import java.lang.invoke.LambdaForm.Name;
+import java.lang.invoke.LambdaForm.NamedFunction;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.HashMap;
+
+import sun.invoke.util.ValueConversions;
import sun.invoke.util.Wrapper;
-import static java.lang.invoke.MethodHandleStatics.*;
+
+import com.sun.xml.internal.ws.org.objectweb.asm.ClassWriter;
+import com.sun.xml.internal.ws.org.objectweb.asm.MethodVisitor;
+import com.sun.xml.internal.ws.org.objectweb.asm.Type;
/**
* The flavor of method handle which emulates an invoke instruction
* on a predetermined argument. The JVM dispatches to the correct method
* when the handle is created, not when it is invoked.
- * @author jrose
+ *
+ * All bound arguments are encapsulated in dedicated species.
*/
-class BoundMethodHandle extends MethodHandle {
- //MethodHandle vmtarget; // next BMH or final DMH or methodOop
- private final Object argument; // argument to insert
- private final int vmargslot; // position at which it is inserted
-
- // Constructors in this class *must* be package scoped or private.
+/* non-public */ abstract class BoundMethodHandle extends MethodHandle {
- /** Bind a direct MH to its receiver (or first ref. argument).
- * The JVM will pre-dispatch the MH if it is not already static.
- */
- /*non-public*/ BoundMethodHandle(DirectMethodHandle mh, Object argument) {
- super(mh.type().dropParameterTypes(0, 1));
- // check the type now, once for all:
- this.argument = checkReferenceArgument(argument, mh, 0);
- this.vmargslot = this.type().parameterSlotCount();
- initTarget(mh, 0);
+ /* non-public */ BoundMethodHandle(MethodType type, LambdaForm form) {
+ super(type, form);
}
- /** Insert an argument into an arbitrary method handle.
- * If argnum is zero, inserts the first argument, etc.
- * The argument type must be a reference.
- */
- /*non-public*/ BoundMethodHandle(MethodHandle mh, Object argument, int argnum) {
- this(mh.type().dropParameterTypes(argnum, argnum+1),
- mh, argument, argnum);
- }
+ //
+ // BMH API and internals
+ //
- /** Insert an argument into an arbitrary method handle.
- * If argnum is zero, inserts the first argument, etc.
- */
- /*non-public*/ BoundMethodHandle(MethodType type, MethodHandle mh, Object argument, int argnum) {
- super(type);
- if (mh.type().parameterType(argnum).isPrimitive())
- this.argument = bindPrimitiveArgument(argument, mh, argnum);
- else {
- this.argument = checkReferenceArgument(argument, mh, argnum);
+ static MethodHandle bindSingle(MethodType type, LambdaForm form, char xtype, Object x) {
+ // for some type signatures, there exist pre-defined concrete BMH classes
+ try {
+ switch (xtype) {
+ case 'L':
+ if (true) return bindSingle(type, form, x); // Use known fast path.
+ return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('L').constructor[0].invokeBasic(type, form, x);
+ case 'I':
+ return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('I').constructor[0].invokeBasic(type, form, ValueConversions.widenSubword(x));
+ case 'J':
+ return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('J').constructor[0].invokeBasic(type, form, (long) x);
+ case 'F':
+ return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('F').constructor[0].invokeBasic(type, form, (float) x);
+ case 'D':
+ return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('D').constructor[0].invokeBasic(type, form, (double) x);
+ default : throw new InternalError("unexpected xtype: " + xtype);
+ }
+ } catch (Throwable t) {
+ throw new InternalError(t);
}
- this.vmargslot = type.parameterSlotDepth(argnum);
- initTarget(mh, argnum);
- }
-
- private void initTarget(MethodHandle mh, int argnum) {
- //this.vmtarget = mh; // maybe updated by JVM
- MethodHandleNatives.init(this, mh, argnum);
- }
-
- /** For the AdapterMethodHandle subclass.
- */
- /*non-public*/ BoundMethodHandle(MethodType type, Object argument, int vmargslot) {
- super(type);
- this.argument = argument;
- this.vmargslot = vmargslot;
- assert(this instanceof AdapterMethodHandle);
}
- /** Initialize the current object as a self-bound method handle, binding it
- * as the first argument of the method handle {@code entryPoint}.
- * The invocation type of the resulting method handle will be the
- * same as {@code entryPoint}, except that the first argument
- * type will be dropped.
- */
- /*non-public*/ BoundMethodHandle(MethodHandle entryPoint) {
- super(entryPoint.type().dropParameterTypes(0, 1));
- this.argument = this; // kludge; get rid of
- this.vmargslot = this.type().parameterSlotDepth(0);
- initTarget(entryPoint, 0);
+ static MethodHandle bindSingle(MethodType type, LambdaForm form, Object x) {
+ return new Species_L(type, form, x);
}
- /** Make sure the given {@code argument} can be used as {@code argnum}-th
- * parameter of the given method handle {@code mh}, which must be a reference.
- * <p>
- * If this fails, throw a suitable {@code WrongMethodTypeException},
- * which will prevent the creation of an illegally typed bound
- * method handle.
- */
- final static Object checkReferenceArgument(Object argument, MethodHandle mh, int argnum) {
- Class<?> ptype = mh.type().parameterType(argnum);
- if (ptype.isPrimitive()) {
- // fail
- } else if (argument == null) {
- return null;
- } else if (VerifyType.isNullReferenceConversion(argument.getClass(), ptype)) {
- return argument;
+ MethodHandle cloneExtend(MethodType type, LambdaForm form, char xtype, Object x) {
+ try {
+ switch (xtype) {
+ case 'L': return cloneExtendL(type, form, x);
+ case 'I': return cloneExtendI(type, form, ValueConversions.widenSubword(x));
+ case 'J': return cloneExtendJ(type, form, (long) x);
+ case 'F': return cloneExtendF(type, form, (float) x);
+ case 'D': return cloneExtendD(type, form, (double) x);
+ }
+ } catch (Throwable t) {
+ throw new InternalError(t);
}
- throw badBoundArgumentException(argument, mh, argnum);
+ throw new InternalError("unexpected type: " + xtype);
}
- /** Make sure the given {@code argument} can be used as {@code argnum}-th
- * parameter of the given method handle {@code mh}, which must be a primitive.
- * <p>
- * If this fails, throw a suitable {@code WrongMethodTypeException},
- * which will prevent the creation of an illegally typed bound
- * method handle.
- */
- final static Object bindPrimitiveArgument(Object argument, MethodHandle mh, int argnum) {
- Class<?> ptype = mh.type().parameterType(argnum);
- Wrapper wrap = Wrapper.forPrimitiveType(ptype);
- Object zero = wrap.zero();
- if (zero == null) {
- // fail
- } else if (argument == null) {
- if (ptype != int.class && wrap.isSubwordOrInt())
- return Integer.valueOf(0);
- else
- return zero;
- } else if (VerifyType.isNullReferenceConversion(argument.getClass(), zero.getClass())) {
- if (ptype != int.class && wrap.isSubwordOrInt())
- return Wrapper.INT.wrap(argument);
- else
- return argument;
- }
- throw badBoundArgumentException(argument, mh, argnum);
+ @Override
+ MethodHandle bindArgument(int pos, char basicType, Object value) {
+ MethodType type = type().dropParameterTypes(pos, pos+1);
+ LambdaForm form = internalForm().bind(1+pos, speciesData());
+ return cloneExtend(type, form, basicType, value);
}
- final static RuntimeException badBoundArgumentException(Object argument, MethodHandle mh, int argnum) {
- String atype = (argument == null) ? "null" : argument.getClass().toString();
- return new ClassCastException("cannot bind "+atype+" argument to parameter #"+argnum+" of "+mh.type());
+ @Override
+ MethodHandle dropArguments(MethodType srcType, int pos, int drops) {
+ LambdaForm form = internalForm().addArguments(pos, srcType.parameterList().subList(pos, pos+drops));
+ try {
+ return clone(srcType, form);
+ } catch (Throwable t) {
+ throw new InternalError(t);
+ }
}
@Override
- String debugString() {
- return addTypeString(baseName(), this);
+ MethodHandle permuteArguments(MethodType newType, int[] reorder) {
+ try {
+ return clone(newType, form.permuteArguments(1, reorder, basicTypes(newType.parameterList())));
+ } catch (Throwable t) {
+ throw new InternalError(t);
+ }
+ }
+
+ static final String EXTENSION_TYPES = "LIJFD";
+ static final byte INDEX_L = 0, INDEX_I = 1, INDEX_J = 2, INDEX_F = 3, INDEX_D = 4;
+ static byte extensionIndex(char type) {
+ int i = EXTENSION_TYPES.indexOf(type);
+ if (i < 0) throw new InternalError();
+ return (byte) i;
+ }
+
+ /**
+ * Return the {@link SpeciesData} instance representing this BMH species. All subclasses must provide a
+ * static field containing this value, and they must accordingly implement this method.
+ */
+ protected abstract SpeciesData speciesData();
+
+ @Override
+ final Object internalValues() {
+ Object[] boundValues = new Object[speciesData().fieldCount()];
+ for (int i = 0; i < boundValues.length; ++i) {
+ boundValues[i] = arg(i);
+ }
+ return Arrays.asList(boundValues);
+ }
+
+ public final Object arg(int i) {
+ try {
+ switch (speciesData().fieldType(i)) {
+ case 'L': return argL(i);
+ case 'I': return argI(i);
+ case 'F': return argF(i);
+ case 'D': return argD(i);
+ case 'J': return argJ(i);
+ }
+ } catch (Throwable ex) {
+ throw new InternalError(ex);
+ }
+ throw new InternalError("unexpected type: " + speciesData().types+"."+i);
+ }
+ public final Object argL(int i) throws Throwable { return speciesData().getters[i].invokeBasic(this); }
+ public final int argI(int i) throws Throwable { return (int) speciesData().getters[i].invokeBasic(this); }
+ public final float argF(int i) throws Throwable { return (float) speciesData().getters[i].invokeBasic(this); }
+ public final double argD(int i) throws Throwable { return (double) speciesData().getters[i].invokeBasic(this); }
+ public final long argJ(int i) throws Throwable { return (long) speciesData().getters[i].invokeBasic(this); }
+
+ //
+ // cloning API
+ //
+
+ public abstract BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable;
+ public abstract BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable;
+ public abstract BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable;
+ public abstract BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable;
+ public abstract BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable;
+ public abstract BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable;
+
+ // The following is a grossly irregular hack:
+ @Override MethodHandle reinvokerTarget() {
+ try {
+ return (MethodHandle) argL(0);
+ } catch (Throwable ex) {
+ throw new InternalError(ex);
+ }
+ }
+
+ //
+ // concrete BMH classes required to close bootstrap loops
+ //
+
+ private // make it private to force users to access the enclosing class first
+ static final class Species_L extends BoundMethodHandle {
+ final Object argL0;
+ public Species_L(MethodType mt, LambdaForm lf, Object argL0) {
+ super(mt, lf);
+ this.argL0 = argL0;
+ }
+ // The following is a grossly irregular hack:
+ @Override MethodHandle reinvokerTarget() { return (MethodHandle) argL0; }
+ @Override
+ public SpeciesData speciesData() {
+ return SPECIES_DATA;
+ }
+ public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("L", Species_L.class);
+ @Override
+ public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
+ return new Species_L(mt, lf, argL0);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, narg);
+ }
+ }
+
+/*
+ static final class Species_LL extends BoundMethodHandle {
+ final Object argL0;
+ final Object argL1;
+ public Species_LL(MethodType mt, LambdaForm lf, Object argL0, Object argL1) {
+ super(mt, lf);
+ this.argL0 = argL0;
+ this.argL1 = argL1;
+ }
+ @Override
+ public SpeciesData speciesData() {
+ return SPECIES_DATA;
+ }
+ public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("LL", Species_LL.class);
+ @Override
+ public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
+ return new Species_LL(mt, lf, argL0, argL1);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
+ }
+ }
+
+ static final class Species_JL extends BoundMethodHandle {
+ final long argJ0;
+ final Object argL1;
+ public Species_JL(MethodType mt, LambdaForm lf, long argJ0, Object argL1) {
+ super(mt, lf);
+ this.argJ0 = argJ0;
+ this.argL1 = argL1;
+ }
+ @Override
+ public SpeciesData speciesData() {
+ return SPECIES_DATA;
+ }
+ public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("JL", Species_JL.class);
+ @Override public final long argJ0() { return argJ0; }
+ @Override public final Object argL1() { return argL1; }
+ @Override
+ public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
+ return new Species_JL(mt, lf, argJ0, argL1);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
+ }
+ @Override
+ public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
+ return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
+ }
+ }
+*/
+
+ //
+ // BMH species meta-data
+ //
+
+ /**
+ * Meta-data wrapper for concrete BMH classes.
+ */
+ static class SpeciesData {
+ final String types;
+ final Class<? extends BoundMethodHandle> clazz;
+ // Bootstrapping requires circular relations MH -> BMH -> SpeciesData -> MH
+ // Therefore, we need a non-final link in the chain. Use array elements.
+ final MethodHandle[] constructor;
+ final MethodHandle[] getters;
+ final SpeciesData[] extensions;
+
+ public int fieldCount() {
+ return types.length();
+ }
+ public char fieldType(int i) {
+ return types.charAt(i);
+ }
+
+ public String toString() {
+ return "SpeciesData["+(isPlaceholder() ? "<placeholder>" : clazz.getSimpleName())+":"+types+"]";
+ }
+
+ /**
+ * Return a {@link LambdaForm.Name} containing a {@link LambdaForm.NamedFunction} that
+ * represents a MH bound to a generic invoker, which in turn forwards to the corresponding
+ * getter.
+ */
+ Name getterName(Name mhName, int i) {
+ MethodHandle mh = getters[i];
+ assert(mh != null) : this+"."+i;
+ return new Name(mh, mhName);
+ }
+
+ static final SpeciesData EMPTY = new SpeciesData("", BoundMethodHandle.class);
+
+ private SpeciesData(String types, Class<? extends BoundMethodHandle> clazz) {
+ this.types = types;
+ this.clazz = clazz;
+ if (!INIT_DONE) {
+ this.constructor = new MethodHandle[1];
+ this.getters = new MethodHandle[types.length()];
+ } else {
+ this.constructor = Factory.makeCtors(clazz, types, null);
+ this.getters = Factory.makeGetters(clazz, types, null);
+ }
+ this.extensions = new SpeciesData[EXTENSION_TYPES.length()];
+ }
+
+ private void initForBootstrap() {
+ assert(!INIT_DONE);
+ if (constructor[0] == null) {
+ Factory.makeCtors(clazz, types, this.constructor);
+ Factory.makeGetters(clazz, types, this.getters);
+ }
+ }
+
+ private SpeciesData(String types) {
+ // Placeholder only.
+ this.types = types;
+ this.clazz = null;
+ this.constructor = null;
+ this.getters = null;
+ this.extensions = null;
+ }
+ private boolean isPlaceholder() { return clazz == null; }
+
+ private static final HashMap<String, SpeciesData> CACHE = new HashMap<>();
+ private static final boolean INIT_DONE; // set after <clinit> finishes...
+
+ SpeciesData extendWithType(char type) {
+ int i = extensionIndex(type);
+ SpeciesData d = extensions[i];
+ if (d != null) return d;
+ extensions[i] = d = get(types+type);
+ return d;
+ }
+
+ SpeciesData extendWithIndex(byte index) {
+ SpeciesData d = extensions[index];
+ if (d != null) return d;
+ extensions[index] = d = get(types+EXTENSION_TYPES.charAt(index));
+ return d;
+ }
+
+ private static SpeciesData get(String types) {
+ // Acquire cache lock for query.
+ SpeciesData d = lookupCache(types);
+ if (!d.isPlaceholder())
+ return d;
+ Class<? extends BoundMethodHandle> cbmh;
+ synchronized (d) {
+ // Use synch. on the placeholder to prevent multiple instantiation of one species.
+ // Creating this class forces a recursive call to getForClass.
+ cbmh = Factory.generateConcreteBMHClass(types);
+ }
+ // Reacquire cache lock.
+ d = lookupCache(types);
+ // Class loading must have upgraded the cache.
+ assert(d != null && !d.isPlaceholder());
+ return d;
+ }
+ static SpeciesData getForClass(String types, Class<? extends BoundMethodHandle> clazz) {
+ // clazz is a new class which is initializing its SPECIES_DATA field
+ return updateCache(types, new SpeciesData(types, clazz));
+ }
+ private static synchronized SpeciesData lookupCache(String types) {
+ SpeciesData d = CACHE.get(types);
+ if (d != null) return d;
+ d = new SpeciesData(types);
+ assert(d.isPlaceholder());
+ CACHE.put(types, d);
+ return d;
+ }
+ private static synchronized SpeciesData updateCache(String types, SpeciesData d) {
+ SpeciesData d2;
+ assert((d2 = CACHE.get(types)) == null || d2.isPlaceholder());
+ assert(!d.isPlaceholder());
+ CACHE.put(types, d);
+ return d;
+ }
+
+ static {
+ // pre-fill the BMH speciesdata cache with BMH's inner classes
+ final Class<BoundMethodHandle> rootCls = BoundMethodHandle.class;
+ SpeciesData d0 = BoundMethodHandle.SPECIES_DATA; // trigger class init
+ assert(d0 == null || d0 == lookupCache("")) : d0;
+ try {
+ for (Class<?> c : rootCls.getDeclaredClasses()) {
+ if (rootCls.isAssignableFrom(c)) {
+ final Class<? extends BoundMethodHandle> cbmh = c.asSubclass(BoundMethodHandle.class);
+ SpeciesData d = Factory.speciesDataFromConcreteBMHClass(cbmh);
+ assert(d != null) : cbmh.getName();
+ assert(d.clazz == cbmh);
+ assert(d == lookupCache(d.types));
+ }
+ }
+ } catch (Throwable e) {
+ throw new InternalError(e);
+ }
+
+ for (SpeciesData d : CACHE.values()) {
+ d.initForBootstrap();
+ }
+ // Note: Do not simplify this, because INIT_DONE must not be
+ // a compile-time constant during bootstrapping.
+ INIT_DONE = Boolean.TRUE;
+ }
+ }
+
+ static SpeciesData getSpeciesData(String types) {
+ return SpeciesData.get(types);
}
- /** Component of toString() before the type string. */
- protected String baseName() {
- MethodHandle mh = this;
- while (mh instanceof BoundMethodHandle) {
- Object info = MethodHandleNatives.getTargetInfo(mh);
- if (info instanceof MethodHandle) {
- mh = (MethodHandle) info;
- } else {
- String name = null;
- if (info instanceof MemberName)
- name = ((MemberName)info).getName();
- if (name != null)
- return name;
- else
- return noParens(super.toString()); // "invoke", probably
+ /**
+ * Generation of concrete BMH classes.
+ *
+ * A concrete BMH species is fit for binding a number of values adhering to a
+ * given type pattern. Reference types are erased.
+ *
+ * BMH species are cached by type pattern.
+ *
+ * A BMH species has a number of fields with the concrete (possibly erased) types of
+ * bound values. Setters are provided as an API in BMH. Getters are exposed as MHs,
+ * which can be included as names in lambda forms.
+ */
+ static class Factory {
+
+ static final String JLO_SIG = "Ljava/lang/Object;";
+ static final String JLS_SIG = "Ljava/lang/String;";
+ static final String JLC_SIG = "Ljava/lang/Class;";
+ static final String MH = "java/lang/invoke/MethodHandle";
+ static final String MH_SIG = "L"+MH+";";
+ static final String BMH = "java/lang/invoke/BoundMethodHandle";
+ static final String BMH_SIG = "L"+BMH+";";
+ static final String SPECIES_DATA = "java/lang/invoke/BoundMethodHandle$SpeciesData";
+ static final String SPECIES_DATA_SIG = "L"+SPECIES_DATA+";";
+
+ static final String SPECIES_PREFIX_NAME = "Species_";
+ static final String SPECIES_PREFIX_PATH = BMH + "$" + SPECIES_PREFIX_NAME;
+
+ static final String BMHSPECIES_DATA_EWI_SIG = "(B)" + SPECIES_DATA_SIG;
+ static final String BMHSPECIES_DATA_GFC_SIG = "(" + JLS_SIG + JLC_SIG + ")" + SPECIES_DATA_SIG;
+ static final String MYSPECIES_DATA_SIG = "()" + SPECIES_DATA_SIG;
+ static final String VOID_SIG = "()V";
+
+ static final String SIG_INCIPIT = "(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;";
+
+ static final Class<?>[] TYPES = new Class<?>[] { Object.class, int.class, long.class, float.class, double.class };
+
+ static final String[] E_THROWABLE = new String[] { "java/lang/Throwable" };
+
+ /**
+ * Generate a concrete subclass of BMH for a given combination of bound types.
+ *
+ * A concrete BMH species adheres to the following schema:
+ *
+ * <pre>
+ * class Species_<<types>> extends BoundMethodHandle {
+ * <<fields>>
+ * final SpeciesData speciesData() { return SpeciesData.get("<<types>>"); }
+ * }
+ * </pre>
+ *
+ * The {@code <<types>>} signature is precisely the string that is passed to this
+ * method.
+ *
+ * The {@code <<fields>>} section consists of one field definition per character in
+ * the type signature, adhering to the naming schema described in the definition of
+ * {@link #makeFieldName()}.
+ *
+ * For example, a concrete BMH species for two reference and one integral bound values
+ * would have the following shape:
+ *
+ * <pre>
+ * class BoundMethodHandle { ... private static
+ * final class Species_LLI extends BoundMethodHandle {
+ * final Object argL0;
+ * final Object argL1;
+ * final int argI2;
+ * public Species_LLI(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) {
+ * super(mt, lf);
+ * this.argL0 = argL0;
+ * this.argL1 = argL1;
+ * this.argI2 = argI2;
+ * }
+ * public final SpeciesData speciesData() { return SPECIES_DATA; }
+ * public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("LLI", Species_LLI.class);
+ * public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) {
+ * return SPECIES_DATA.constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2);
+ * }
+ * public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) {
+ * return SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
+ * }
+ * public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) {
+ * return SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
+ * }
+ * public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) {
+ * return SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
+ * }
+ * public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) {
+ * return SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
+ * }
+ * public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) {
+ * return SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
+ * }
+ * }
+ * </pre>
+ *
+ * @param types the type signature, wherein reference types are erased to 'L'
+ * @return the generated concrete BMH class
+ */
+ static Class<? extends BoundMethodHandle> generateConcreteBMHClass(String types) {
+ final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
+
+ final String className = SPECIES_PREFIX_PATH + types;
+ final String sourceFile = SPECIES_PREFIX_NAME + types;
+ cw.visit(V1_6, ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, BMH, null);
+ cw.visitSource(sourceFile, null);
+
+ // emit static types and SPECIES_DATA fields
+ cw.visitField(ACC_PUBLIC + ACC_STATIC, "SPECIES_DATA", SPECIES_DATA_SIG, null, null).visitEnd();
+
+ // emit bound argument fields
+ for (int i = 0; i < types.length(); ++i) {
+ final char t = types.charAt(i);
+ final String fieldName = makeFieldName(types, i);
+ final String fieldDesc = t == 'L' ? JLO_SIG : String.valueOf(t);
+ cw.visitField(ACC_FINAL, fieldName, fieldDesc, null, null).visitEnd();
+ }
+
+ MethodVisitor mv;
+
+ // emit constructor
+ mv = cw.visitMethod(ACC_PUBLIC, "<init>", makeSignature(types, true), null, null);
+ mv.visitCode();
+ mv.visitVarInsn(ALOAD, 0);
+ mv.visitVarInsn(ALOAD, 1);
+ mv.visitVarInsn(ALOAD, 2);
+
+ mv.visitMethodInsn(INVOKESPECIAL, BMH, "<init>", makeSignature("", true));
+
+ for (int i = 0, j = 0; i < types.length(); ++i, ++j) {
+ // i counts the arguments, j counts corresponding argument slots
+ char t = types.charAt(i);
+ mv.visitVarInsn(ALOAD, 0);
+ mv.visitVarInsn(typeLoadOp(t), j + 3); // parameters start at 3
+ mv.visitFieldInsn(PUTFIELD, className, makeFieldName(types, i), typeSig(t));
+ if (t == 'J' || t == 'D') {
+ ++j; // adjust argument register access
+ }
}
- assert(mh != this);
+
+ mv.visitInsn(RETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+
+ // emit implementation of reinvokerTarget()
+ mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "reinvokerTarget", "()" + MH_SIG, null, null);
+ mv.visitCode();
+ mv.visitVarInsn(ALOAD, 0);
+ mv.visitFieldInsn(GETFIELD, className, "argL0", JLO_SIG);
+ mv.visitTypeInsn(CHECKCAST, MH);
+ mv.visitInsn(ARETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+
+ // emit implementation of speciesData()
+ mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "speciesData", MYSPECIES_DATA_SIG, null, null);
+ mv.visitCode();
+ mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
+ mv.visitInsn(ARETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+
+ // emit clone()
+ mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "clone", makeSignature("", false), null, E_THROWABLE);
+ mv.visitCode();
+ // return speciesData().constructor[0].invokeBasic(mt, lf, argL0, ...)
+ // obtain constructor
+ mv.visitVarInsn(ALOAD, 0);
+ mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
+ mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
+ mv.visitInsn(ICONST_0);
+ mv.visitInsn(AALOAD);
+ // load mt, lf
+ mv.visitVarInsn(ALOAD, 1);
+ mv.visitVarInsn(ALOAD, 2);
+ // put fields on the stack
+ emitPushFields(types, className, mv);
+ // finally, invoke the constructor and return
+ mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types, false));
+ mv.visitInsn(ARETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+
+ // for each type, emit cloneExtendT()
+ for (Class<?> c : TYPES) {
+ char t = Wrapper.basicTypeChar(c);
+ mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "cloneExtend" + t, makeSignature(String.valueOf(t), false), null, E_THROWABLE);
+ mv.visitCode();
+ // return SPECIES_DATA.extendWithIndex(extensionIndex(t)).constructor[0].invokeBasic(mt, lf, argL0, ..., narg)
+ // obtain constructor
+ mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
+ int iconstInsn = ICONST_0 + extensionIndex(t);
+ assert(iconstInsn <= ICONST_5);
+ mv.visitInsn(iconstInsn);
+ mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "extendWithIndex", BMHSPECIES_DATA_EWI_SIG);
+ mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
+ mv.visitInsn(ICONST_0);
+ mv.visitInsn(AALOAD);
+ // load mt, lf
+ mv.visitVarInsn(ALOAD, 1);
+ mv.visitVarInsn(ALOAD, 2);
+ // put fields on the stack
+ emitPushFields(types, className, mv);
+ // put narg on stack
+ mv.visitVarInsn(typeLoadOp(t), 3);
+ // finally, invoke the constructor and return
+ mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types + t, false));
+ mv.visitInsn(ARETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+ }
+
+ // emit class initializer
+ mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "<clinit>", VOID_SIG, null, null);
+ mv.visitCode();
+ mv.visitLdcInsn(types);
+ mv.visitLdcInsn(Type.getObjectType(className));
+ mv.visitMethodInsn(INVOKESTATIC, SPECIES_DATA, "getForClass", BMHSPECIES_DATA_GFC_SIG);
+ mv.visitFieldInsn(PUTSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
+ mv.visitInsn(RETURN);
+ mv.visitMaxs(0, 0);
+ mv.visitEnd();
+
+ cw.visitEnd();
+
+ // load class
+ final byte[] classFile = cw.toByteArray();
+ InvokerBytecodeGenerator.maybeDump(className, classFile);
+ Class<? extends BoundMethodHandle> bmhClass =
+ //UNSAFE.defineAnonymousClass(BoundMethodHandle.class, classFile, null).asSubclass(BoundMethodHandle.class);
+ UNSAFE.defineClass(className, classFile, 0, classFile.length).asSubclass(BoundMethodHandle.class);
+ UNSAFE.ensureClassInitialized(bmhClass);
+
+ return bmhClass;
+ }
+
+ private static int typeLoadOp(char t) {
+ switch (t) {
+ case 'L': return ALOAD;
+ case 'I': return ILOAD;
+ case 'J': return LLOAD;
+ case 'F': return FLOAD;
+ case 'D': return DLOAD;
+ default : throw new InternalError("unrecognized type " + t);
+ }
}
- return noParens(mh.toString());
+
+ private static void emitPushFields(String types, String className, MethodVisitor mv) {
+ for (int i = 0; i < types.length(); ++i) {
+ char tc = types.charAt(i);
+ mv.visitVarInsn(ALOAD, 0);
+ mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
+ }
+ }
+
+ static String typeSig(char t) {
+ return t == 'L' ? JLO_SIG : String.valueOf(t);
+ }
+
+ //
+ // Getter MH generation.
+ //
+
+ private static MethodHandle makeGetter(Class<?> cbmhClass, String types, int index) {
+ String fieldName = makeFieldName(types, index);
+ Class<?> fieldType = Wrapper.forBasicType(types.charAt(index)).primitiveType();
+ try {
+ return LOOKUP.findGetter(cbmhClass, fieldName, fieldType);
+ } catch (NoSuchFieldException | IllegalAccessException e) {
+ throw new InternalError(e);
+ }
+ }
+
+ static MethodHandle[] makeGetters(Class<?> cbmhClass, String types, MethodHandle[] mhs) {
+ if (mhs == null) mhs = new MethodHandle[types.length()];
+ for (int i = 0; i < mhs.length; ++i) {
+ mhs[i] = makeGetter(cbmhClass, types, i);
+ assert(mhs[i].internalMemberName().getDeclaringClass() == cbmhClass);
+ }
+ return mhs;
+ }
+
+ static MethodHandle[] makeCtors(Class<? extends BoundMethodHandle> cbmh, String types, MethodHandle mhs[]) {
+ if (mhs == null) mhs = new MethodHandle[1];
+ mhs[0] = makeCbmhCtor(cbmh, types);
+ return mhs;
+ }
+
+ //
+ // Auxiliary methods.
+ //
+
+ static SpeciesData speciesDataFromConcreteBMHClass(Class<? extends BoundMethodHandle> cbmh) {
+ try {
+ Field F_SPECIES_DATA = cbmh.getDeclaredField("SPECIES_DATA");
+ return (SpeciesData) F_SPECIES_DATA.get(null);
+ } catch (ReflectiveOperationException ex) {
+ throw new InternalError(ex);
+ }
+ }
+
+ /**
+ * Field names in concrete BMHs adhere to this pattern:
+ * arg + type + index
+ * where type is a single character (L, I, J, F, D).
+ */
+ private static String makeFieldName(String types, int index) {
+ assert index >= 0 && index < types.length();
+ return "arg" + types.charAt(index) + index;
+ }
+
+ private static String makeSignature(String types, boolean ctor) {
+ StringBuilder buf = new StringBuilder(SIG_INCIPIT);
+ for (char c : types.toCharArray()) {
+ buf.append(typeSig(c));
+ }
+ return buf.append(')').append(ctor ? "V" : BMH_SIG).toString();
+ }
+
+ static MethodHandle makeCbmhCtor(Class<? extends BoundMethodHandle> cbmh, String types) {
+ try {
+ return linkConstructor(LOOKUP.findConstructor(cbmh, MethodType.fromMethodDescriptorString(makeSignature(types, true), null)));
+ } catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | TypeNotPresentException e) {
+ throw new InternalError(e);
+ }
+ }
+
+ /**
+ * Wrap a constructor call in a {@link LambdaForm}.
+ *
+ * If constructors ({@code <init>} methods) are called in LFs, problems might arise if the LFs
+ * are turned into bytecode, because the call to the allocator is routed through an MH, and the
+ * verifier cannot find a {@code NEW} instruction preceding the {@code INVOKESPECIAL} to
+ * {@code <init>}. To avoid this, we add an indirection by invoking {@code <init>} through
+ * {@link MethodHandle#linkToSpecial}.
+ *
+ * The last {@link LambdaForm#Name Name} in the argument's form is expected to be the {@code void}
+ * result of the {@code <init>} invocation. This entry is replaced.
+ */
+ private static MethodHandle linkConstructor(MethodHandle cmh) {
+ final LambdaForm lf = cmh.form;
+ final int initNameIndex = lf.names.length - 1;
+ final Name initName = lf.names[initNameIndex];
+ final MemberName ctorMN = initName.function.member;
+ final MethodType ctorMT = ctorMN.getInvocationType();
+
+ // obtain function member (call target)
+ // linker method type replaces initial parameter (BMH species) with BMH to avoid naming a species (anonymous class!)
+ final MethodType linkerMT = ctorMT.changeParameterType(0, BoundMethodHandle.class).appendParameterTypes(MemberName.class);
+ MemberName linkerMN = new MemberName(MethodHandle.class, "linkToSpecial", linkerMT, REF_invokeStatic);
+ try {
+ linkerMN = MemberName.getFactory().resolveOrFail(REF_invokeStatic, linkerMN, null, NoSuchMethodException.class);
+ assert(linkerMN.isStatic());
+ } catch (ReflectiveOperationException ex) {
+ throw new InternalError(ex);
+ }
+ // extend arguments array
+ Object[] newArgs = Arrays.copyOf(initName.arguments, initName.arguments.length + 1);
+ newArgs[newArgs.length - 1] = ctorMN;
+ // replace function
+ final NamedFunction nf = new NamedFunction(linkerMN);
+ final Name linkedCtor = new Name(nf, newArgs);
+ linkedCtor.initIndex(initNameIndex);
+ lf.names[initNameIndex] = linkedCtor;
+ return cmh;
+ }
+
}
- private static String noParens(String str) {
- int paren = str.indexOf('(');
- if (paren >= 0) str = str.substring(0, paren);
- return str;
- }
+ private static final Lookup LOOKUP = Lookup.IMPL_LOOKUP;
+
+ /**
+ * All subclasses must provide such a value describing their type signature.
+ */
+ static final SpeciesData SPECIES_DATA = SpeciesData.EMPTY;
}