jaroslav@1646: /*
jaroslav@1646:  * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
jaroslav@1646:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@1646:  *
jaroslav@1646:  * This code is free software; you can redistribute it and/or modify it
jaroslav@1646:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@1646:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@1646:  * particular file as subject to the "Classpath" exception as provided
jaroslav@1646:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@1646:  *
jaroslav@1646:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@1646:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@1646:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@1646:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@1646:  * accompanied this code).
jaroslav@1646:  *
jaroslav@1646:  * You should have received a copy of the GNU General Public License version
jaroslav@1646:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@1646:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@1646:  *
jaroslav@1646:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@1646:  * or visit www.oracle.com if you need additional information or have any
jaroslav@1646:  * questions.
jaroslav@1646:  */
jaroslav@1646: 
jaroslav@1646: package java.lang.invoke;
jaroslav@1646: 
jaroslav@1646: import static jdk.internal.org.objectweb.asm.Opcodes.*;
jaroslav@1646: import static java.lang.invoke.LambdaForm.basicTypes;
jaroslav@1646: import static java.lang.invoke.MethodHandleNatives.Constants.REF_invokeStatic;
jaroslav@1646: import static java.lang.invoke.MethodHandleStatics.*;
jaroslav@1646: 
jaroslav@1646: import java.lang.invoke.LambdaForm.Name;
jaroslav@1646: import java.lang.invoke.LambdaForm.NamedFunction;
jaroslav@1646: import java.lang.invoke.MethodHandles.Lookup;
jaroslav@1646: import java.lang.reflect.Field;
jaroslav@1646: import java.util.Arrays;
jaroslav@1646: import java.util.HashMap;
jaroslav@1646: 
jaroslav@1646: import sun.invoke.util.ValueConversions;
jaroslav@1646: import sun.invoke.util.Wrapper;
jaroslav@1646: 
jaroslav@1646: import jdk.internal.org.objectweb.asm.ClassWriter;
jaroslav@1646: import jdk.internal.org.objectweb.asm.MethodVisitor;
jaroslav@1646: import jdk.internal.org.objectweb.asm.Type;
jaroslav@1646: 
jaroslav@1646: /**
jaroslav@1646:  * The flavor of method handle which emulates an invoke instruction
jaroslav@1646:  * on a predetermined argument.  The JVM dispatches to the correct method
jaroslav@1646:  * when the handle is created, not when it is invoked.
jaroslav@1646:  *
jaroslav@1646:  * All bound arguments are encapsulated in dedicated species.
jaroslav@1646:  */
jaroslav@1646: /* non-public */ abstract class BoundMethodHandle extends MethodHandle {
jaroslav@1646: 
jaroslav@1646:     /* non-public */ BoundMethodHandle(MethodType type, LambdaForm form) {
jaroslav@1646:         super(type, form);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     //
jaroslav@1646:     // BMH API and internals
jaroslav@1646:     //
jaroslav@1646: 
jaroslav@1646:     static MethodHandle bindSingle(MethodType type, LambdaForm form, char xtype, Object x) {
jaroslav@1646:         // for some type signatures, there exist pre-defined concrete BMH classes
jaroslav@1646:         try {
jaroslav@1646:             switch (xtype) {
jaroslav@1646:             case 'L':
jaroslav@1646:                 if (true)  return bindSingle(type, form, x);  // Use known fast path.
jaroslav@1646:                 return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('L').constructor[0].invokeBasic(type, form, x);
jaroslav@1646:             case 'I':
jaroslav@1646:                 return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('I').constructor[0].invokeBasic(type, form, ValueConversions.widenSubword(x));
jaroslav@1646:             case 'J':
jaroslav@1646:                 return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('J').constructor[0].invokeBasic(type, form, (long) x);
jaroslav@1646:             case 'F':
jaroslav@1646:                 return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('F').constructor[0].invokeBasic(type, form, (float) x);
jaroslav@1646:             case 'D':
jaroslav@1646:                 return (BoundMethodHandle) SpeciesData.EMPTY.extendWithType('D').constructor[0].invokeBasic(type, form, (double) x);
jaroslav@1646:             default : throw new InternalError("unexpected xtype: " + xtype);
jaroslav@1646:             }
jaroslav@1646:         } catch (Throwable t) {
jaroslav@1646:             throw newInternalError(t);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static MethodHandle bindSingle(MethodType type, LambdaForm form, Object x) {
jaroslav@1646:             return new Species_L(type, form, x);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     MethodHandle cloneExtend(MethodType type, LambdaForm form, char xtype, Object x) {
jaroslav@1646:         try {
jaroslav@1646:             switch (xtype) {
jaroslav@1646:             case 'L': return cloneExtendL(type, form, x);
jaroslav@1646:             case 'I': return cloneExtendI(type, form, ValueConversions.widenSubword(x));
jaroslav@1646:             case 'J': return cloneExtendJ(type, form, (long) x);
jaroslav@1646:             case 'F': return cloneExtendF(type, form, (float) x);
jaroslav@1646:             case 'D': return cloneExtendD(type, form, (double) x);
jaroslav@1646:             }
jaroslav@1646:         } catch (Throwable t) {
jaroslav@1646:             throw newInternalError(t);
jaroslav@1646:         }
jaroslav@1646:         throw new InternalError("unexpected type: " + xtype);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     MethodHandle bindArgument(int pos, char basicType, Object value) {
jaroslav@1646:         MethodType type = type().dropParameterTypes(pos, pos+1);
jaroslav@1646:         LambdaForm form = internalForm().bind(1+pos, speciesData());
jaroslav@1646:         return cloneExtend(type, form, basicType, value);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     MethodHandle dropArguments(MethodType srcType, int pos, int drops) {
jaroslav@1646:         LambdaForm form = internalForm().addArguments(pos, srcType.parameterList().subList(pos, pos+drops));
jaroslav@1646:         try {
jaroslav@1646:              return clone(srcType, form);
jaroslav@1646:          } catch (Throwable t) {
jaroslav@1646:              throw newInternalError(t);
jaroslav@1646:          }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     MethodHandle permuteArguments(MethodType newType, int[] reorder) {
jaroslav@1646:         try {
jaroslav@1646:              return clone(newType, form.permuteArguments(1, reorder, basicTypes(newType.parameterList())));
jaroslav@1646:          } catch (Throwable t) {
jaroslav@1646:              throw newInternalError(t);
jaroslav@1646:          }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static final String EXTENSION_TYPES = "LIJFD";
jaroslav@1646:     static final byte INDEX_L = 0, INDEX_I = 1, INDEX_J = 2, INDEX_F = 3, INDEX_D = 4;
jaroslav@1646:     static byte extensionIndex(char type) {
jaroslav@1646:         int i = EXTENSION_TYPES.indexOf(type);
jaroslav@1646:         if (i < 0)  throw new InternalError();
jaroslav@1646:         return (byte) i;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Return the {@link SpeciesData} instance representing this BMH species. All subclasses must provide a
jaroslav@1646:      * static field containing this value, and they must accordingly implement this method.
jaroslav@1646:      */
jaroslav@1646:     protected abstract SpeciesData speciesData();
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     final Object internalProperties() {
jaroslav@1646:         return "/BMH="+internalValues();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     final Object internalValues() {
jaroslav@1646:         Object[] boundValues = new Object[speciesData().fieldCount()];
jaroslav@1646:         for (int i = 0; i < boundValues.length; ++i) {
jaroslav@1646:             boundValues[i] = arg(i);
jaroslav@1646:         }
jaroslav@1646:         return Arrays.asList(boundValues);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public final Object arg(int i) {
jaroslav@1646:         try {
jaroslav@1646:             switch (speciesData().fieldType(i)) {
jaroslav@1646:             case 'L': return argL(i);
jaroslav@1646:             case 'I': return argI(i);
jaroslav@1646:             case 'F': return argF(i);
jaroslav@1646:             case 'D': return argD(i);
jaroslav@1646:             case 'J': return argJ(i);
jaroslav@1646:             }
jaroslav@1646:         } catch (Throwable ex) {
jaroslav@1646:             throw newInternalError(ex);
jaroslav@1646:         }
jaroslav@1646:         throw new InternalError("unexpected type: " + speciesData().types+"."+i);
jaroslav@1646:     }
jaroslav@1646:     public final Object argL(int i) throws Throwable { return          speciesData().getters[i].invokeBasic(this); }
jaroslav@1646:     public final int    argI(int i) throws Throwable { return (int)    speciesData().getters[i].invokeBasic(this); }
jaroslav@1646:     public final float  argF(int i) throws Throwable { return (float)  speciesData().getters[i].invokeBasic(this); }
jaroslav@1646:     public final double argD(int i) throws Throwable { return (double) speciesData().getters[i].invokeBasic(this); }
jaroslav@1646:     public final long   argJ(int i) throws Throwable { return (long)   speciesData().getters[i].invokeBasic(this); }
jaroslav@1646: 
jaroslav@1646:     //
jaroslav@1646:     // cloning API
jaroslav@1646:     //
jaroslav@1646: 
jaroslav@1646:     public abstract BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable;
jaroslav@1646:     public abstract BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable;
jaroslav@1646:     public abstract BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int    narg) throws Throwable;
jaroslav@1646:     public abstract BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long   narg) throws Throwable;
jaroslav@1646:     public abstract BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float  narg) throws Throwable;
jaroslav@1646:     public abstract BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable;
jaroslav@1646: 
jaroslav@1646:     // The following is a grossly irregular hack:
jaroslav@1646:     @Override MethodHandle reinvokerTarget() {
jaroslav@1646:         try {
jaroslav@1646:             return (MethodHandle) argL(0);
jaroslav@1646:         } catch (Throwable ex) {
jaroslav@1646:             throw newInternalError(ex);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     //
jaroslav@1646:     // concrete BMH classes required to close bootstrap loops
jaroslav@1646:     //
jaroslav@1646: 
jaroslav@1646:     private  // make it private to force users to access the enclosing class first
jaroslav@1646:     static final class Species_L extends BoundMethodHandle {
jaroslav@1646:         final Object argL0;
jaroslav@1646:         public Species_L(MethodType mt, LambdaForm lf, Object argL0) {
jaroslav@1646:             super(mt, lf);
jaroslav@1646:             this.argL0 = argL0;
jaroslav@1646:         }
jaroslav@1646:         // The following is a grossly irregular hack:
jaroslav@1646:         @Override MethodHandle reinvokerTarget() { return (MethodHandle) argL0; }
jaroslav@1646:         @Override
jaroslav@1646:         public SpeciesData speciesData() {
jaroslav@1646:             return SPECIES_DATA;
jaroslav@1646:         }
jaroslav@1646:         public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("L", Species_L.class);
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
jaroslav@1646:             return new Species_L(mt, lf, argL0);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, narg);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646: /*
jaroslav@1646:     static final class Species_LL extends BoundMethodHandle {
jaroslav@1646:         final Object argL0;
jaroslav@1646:         final Object argL1;
jaroslav@1646:         public Species_LL(MethodType mt, LambdaForm lf, Object argL0, Object argL1) {
jaroslav@1646:             super(mt, lf);
jaroslav@1646:             this.argL0 = argL0;
jaroslav@1646:             this.argL1 = argL1;
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public SpeciesData speciesData() {
jaroslav@1646:             return SPECIES_DATA;
jaroslav@1646:         }
jaroslav@1646:         public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("LL", Species_LL.class);
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
jaroslav@1646:             return new Species_LL(mt, lf, argL0, argL1);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static final class Species_JL extends BoundMethodHandle {
jaroslav@1646:         final long argJ0;
jaroslav@1646:         final Object argL1;
jaroslav@1646:         public Species_JL(MethodType mt, LambdaForm lf, long argJ0, Object argL1) {
jaroslav@1646:             super(mt, lf);
jaroslav@1646:             this.argJ0 = argJ0;
jaroslav@1646:             this.argL1 = argL1;
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public SpeciesData speciesData() {
jaroslav@1646:             return SPECIES_DATA;
jaroslav@1646:         }
jaroslav@1646:         public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("JL", Species_JL.class);
jaroslav@1646:         @Override public final long   argJ0() { return argJ0; }
jaroslav@1646:         @Override public final Object argL1() { return argL1; }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) throws Throwable {
jaroslav@1646:             return new Species_JL(mt, lf, argJ0, argL1);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:         @Override
jaroslav@1646:         public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) throws Throwable {
jaroslav@1646:             return (BoundMethodHandle) SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argJ0, argL1, narg);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: */
jaroslav@1646: 
jaroslav@1646:     //
jaroslav@1646:     // BMH species meta-data
jaroslav@1646:     //
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Meta-data wrapper for concrete BMH classes.
jaroslav@1646:      */
jaroslav@1646:     static class SpeciesData {
jaroslav@1646:         final String                             types;
jaroslav@1646:         final Class<? extends BoundMethodHandle> clazz;
jaroslav@1646:         // Bootstrapping requires circular relations MH -> BMH -> SpeciesData -> MH
jaroslav@1646:         // Therefore, we need a non-final link in the chain.  Use array elements.
jaroslav@1646:         final MethodHandle[]                     constructor;
jaroslav@1646:         final MethodHandle[]                     getters;
jaroslav@1646:         final SpeciesData[]                      extensions;
jaroslav@1646: 
jaroslav@1646:         public int fieldCount() {
jaroslav@1646:             return types.length();
jaroslav@1646:         }
jaroslav@1646:         public char fieldType(int i) {
jaroslav@1646:             return types.charAt(i);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         public String toString() {
jaroslav@1646:             return "SpeciesData["+(isPlaceholder() ? "<placeholder>" : clazz.getSimpleName())+":"+types+"]";
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         /**
jaroslav@1646:          * Return a {@link LambdaForm.Name} containing a {@link LambdaForm.NamedFunction} that
jaroslav@1646:          * represents a MH bound to a generic invoker, which in turn forwards to the corresponding
jaroslav@1646:          * getter.
jaroslav@1646:          */
jaroslav@1646:         Name getterName(Name mhName, int i) {
jaroslav@1646:             MethodHandle mh = getters[i];
jaroslav@1646:             assert(mh != null) : this+"."+i;
jaroslav@1646:             return new Name(mh, mhName);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         NamedFunction getterFunction(int i) {
jaroslav@1646:             return new NamedFunction(getters[i]);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static final SpeciesData EMPTY = new SpeciesData("", BoundMethodHandle.class);
jaroslav@1646: 
jaroslav@1646:         private SpeciesData(String types, Class<? extends BoundMethodHandle> clazz) {
jaroslav@1646:             this.types = types;
jaroslav@1646:             this.clazz = clazz;
jaroslav@1646:             if (!INIT_DONE) {
jaroslav@1646:                 this.constructor = new MethodHandle[1];
jaroslav@1646:                 this.getters = new MethodHandle[types.length()];
jaroslav@1646:             } else {
jaroslav@1646:                 this.constructor = Factory.makeCtors(clazz, types, null);
jaroslav@1646:                 this.getters = Factory.makeGetters(clazz, types, null);
jaroslav@1646:             }
jaroslav@1646:             this.extensions = new SpeciesData[EXTENSION_TYPES.length()];
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private void initForBootstrap() {
jaroslav@1646:             assert(!INIT_DONE);
jaroslav@1646:             if (constructor[0] == null) {
jaroslav@1646:                 Factory.makeCtors(clazz, types, this.constructor);
jaroslav@1646:                 Factory.makeGetters(clazz, types, this.getters);
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private SpeciesData(String types) {
jaroslav@1646:             // Placeholder only.
jaroslav@1646:             this.types = types;
jaroslav@1646:             this.clazz = null;
jaroslav@1646:             this.constructor = null;
jaroslav@1646:             this.getters = null;
jaroslav@1646:             this.extensions = null;
jaroslav@1646:         }
jaroslav@1646:         private boolean isPlaceholder() { return clazz == null; }
jaroslav@1646: 
jaroslav@1646:         private static final HashMap<String, SpeciesData> CACHE = new HashMap<>();
jaroslav@1646:         static { CACHE.put("", EMPTY); }  // make bootstrap predictable
jaroslav@1646:         private static final boolean INIT_DONE;  // set after <clinit> finishes...
jaroslav@1646: 
jaroslav@1646:         SpeciesData extendWithType(char type) {
jaroslav@1646:             int i = extensionIndex(type);
jaroslav@1646:             SpeciesData d = extensions[i];
jaroslav@1646:             if (d != null)  return d;
jaroslav@1646:             extensions[i] = d = get(types+type);
jaroslav@1646:             return d;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         SpeciesData extendWithIndex(byte index) {
jaroslav@1646:             SpeciesData d = extensions[index];
jaroslav@1646:             if (d != null)  return d;
jaroslav@1646:             extensions[index] = d = get(types+EXTENSION_TYPES.charAt(index));
jaroslav@1646:             return d;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private static SpeciesData get(String types) {
jaroslav@1646:             // Acquire cache lock for query.
jaroslav@1646:             SpeciesData d = lookupCache(types);
jaroslav@1646:             if (!d.isPlaceholder())
jaroslav@1646:                 return d;
jaroslav@1646:             synchronized (d) {
jaroslav@1646:                 // Use synch. on the placeholder to prevent multiple instantiation of one species.
jaroslav@1646:                 // Creating this class forces a recursive call to getForClass.
jaroslav@1646:                 if (lookupCache(types).isPlaceholder())
jaroslav@1646:                     Factory.generateConcreteBMHClass(types);
jaroslav@1646:             }
jaroslav@1646:             // Reacquire cache lock.
jaroslav@1646:             d = lookupCache(types);
jaroslav@1646:             // Class loading must have upgraded the cache.
jaroslav@1646:             assert(d != null && !d.isPlaceholder());
jaroslav@1646:             return d;
jaroslav@1646:         }
jaroslav@1646:         static SpeciesData getForClass(String types, Class<? extends BoundMethodHandle> clazz) {
jaroslav@1646:             // clazz is a new class which is initializing its SPECIES_DATA field
jaroslav@1646:             return updateCache(types, new SpeciesData(types, clazz));
jaroslav@1646:         }
jaroslav@1646:         private static synchronized SpeciesData lookupCache(String types) {
jaroslav@1646:             SpeciesData d = CACHE.get(types);
jaroslav@1646:             if (d != null)  return d;
jaroslav@1646:             d = new SpeciesData(types);
jaroslav@1646:             assert(d.isPlaceholder());
jaroslav@1646:             CACHE.put(types, d);
jaroslav@1646:             return d;
jaroslav@1646:         }
jaroslav@1646:         private static synchronized SpeciesData updateCache(String types, SpeciesData d) {
jaroslav@1646:             SpeciesData d2;
jaroslav@1646:             assert((d2 = CACHE.get(types)) == null || d2.isPlaceholder());
jaroslav@1646:             assert(!d.isPlaceholder());
jaroslav@1646:             CACHE.put(types, d);
jaroslav@1646:             return d;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static {
jaroslav@1646:             // pre-fill the BMH speciesdata cache with BMH's inner classes
jaroslav@1646:             final Class<BoundMethodHandle> rootCls = BoundMethodHandle.class;
jaroslav@1646:             SpeciesData d0 = BoundMethodHandle.SPECIES_DATA;  // trigger class init
jaroslav@1646:             assert(d0 == null || d0 == lookupCache("")) : d0;
jaroslav@1646:             try {
jaroslav@1646:                 for (Class<?> c : rootCls.getDeclaredClasses()) {
jaroslav@1646:                     if (rootCls.isAssignableFrom(c)) {
jaroslav@1646:                         final Class<? extends BoundMethodHandle> cbmh = c.asSubclass(BoundMethodHandle.class);
jaroslav@1646:                         SpeciesData d = Factory.speciesDataFromConcreteBMHClass(cbmh);
jaroslav@1646:                         assert(d != null) : cbmh.getName();
jaroslav@1646:                         assert(d.clazz == cbmh);
jaroslav@1646:                         assert(d == lookupCache(d.types));
jaroslav@1646:                     }
jaroslav@1646:                 }
jaroslav@1646:             } catch (Throwable e) {
jaroslav@1646:                 throw newInternalError(e);
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             for (SpeciesData d : CACHE.values()) {
jaroslav@1646:                 d.initForBootstrap();
jaroslav@1646:             }
jaroslav@1646:             // Note:  Do not simplify this, because INIT_DONE must not be
jaroslav@1646:             // a compile-time constant during bootstrapping.
jaroslav@1646:             INIT_DONE = Boolean.TRUE;
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static SpeciesData getSpeciesData(String types) {
jaroslav@1646:         return SpeciesData.get(types);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Generation of concrete BMH classes.
jaroslav@1646:      *
jaroslav@1646:      * A concrete BMH species is fit for binding a number of values adhering to a
jaroslav@1646:      * given type pattern. Reference types are erased.
jaroslav@1646:      *
jaroslav@1646:      * BMH species are cached by type pattern.
jaroslav@1646:      *
jaroslav@1646:      * A BMH species has a number of fields with the concrete (possibly erased) types of
jaroslav@1646:      * bound values. Setters are provided as an API in BMH. Getters are exposed as MHs,
jaroslav@1646:      * which can be included as names in lambda forms.
jaroslav@1646:      */
jaroslav@1646:     static class Factory {
jaroslav@1646: 
jaroslav@1646:         static final String JLO_SIG  = "Ljava/lang/Object;";
jaroslav@1646:         static final String JLS_SIG  = "Ljava/lang/String;";
jaroslav@1646:         static final String JLC_SIG  = "Ljava/lang/Class;";
jaroslav@1646:         static final String MH       = "java/lang/invoke/MethodHandle";
jaroslav@1646:         static final String MH_SIG   = "L"+MH+";";
jaroslav@1646:         static final String BMH      = "java/lang/invoke/BoundMethodHandle";
jaroslav@1646:         static final String BMH_SIG  = "L"+BMH+";";
jaroslav@1646:         static final String SPECIES_DATA     = "java/lang/invoke/BoundMethodHandle$SpeciesData";
jaroslav@1646:         static final String SPECIES_DATA_SIG = "L"+SPECIES_DATA+";";
jaroslav@1646: 
jaroslav@1646:         static final String SPECIES_PREFIX_NAME = "Species_";
jaroslav@1646:         static final String SPECIES_PREFIX_PATH = BMH + "$" + SPECIES_PREFIX_NAME;
jaroslav@1646: 
jaroslav@1646:         static final String BMHSPECIES_DATA_EWI_SIG = "(B)" + SPECIES_DATA_SIG;
jaroslav@1646:         static final String BMHSPECIES_DATA_GFC_SIG = "(" + JLS_SIG + JLC_SIG + ")" + SPECIES_DATA_SIG;
jaroslav@1646:         static final String MYSPECIES_DATA_SIG = "()" + SPECIES_DATA_SIG;
jaroslav@1646:         static final String VOID_SIG   = "()V";
jaroslav@1646: 
jaroslav@1646:         static final String SIG_INCIPIT = "(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;";
jaroslav@1646: 
jaroslav@1646:         static final Class<?>[] TYPES = new Class<?>[] { Object.class, int.class, long.class, float.class, double.class };
jaroslav@1646: 
jaroslav@1646:         static final String[] E_THROWABLE = new String[] { "java/lang/Throwable" };
jaroslav@1646: 
jaroslav@1646:         /**
jaroslav@1646:          * Generate a concrete subclass of BMH for a given combination of bound types.
jaroslav@1646:          *
jaroslav@1646:          * A concrete BMH species adheres to the following schema:
jaroslav@1646:          *
jaroslav@1646:          * <pre>
jaroslav@1646:          * class Species_[[types]] extends BoundMethodHandle {
jaroslav@1646:          *     [[fields]]
jaroslav@1646:          *     final SpeciesData speciesData() { return SpeciesData.get("[[types]]"); }
jaroslav@1646:          * }
jaroslav@1646:          * </pre>
jaroslav@1646:          *
jaroslav@1646:          * The {@code [[types]]} signature is precisely the string that is passed to this
jaroslav@1646:          * method.
jaroslav@1646:          *
jaroslav@1646:          * The {@code [[fields]]} section consists of one field definition per character in
jaroslav@1646:          * the type signature, adhering to the naming schema described in the definition of
jaroslav@1646:          * {@link #makeFieldName}.
jaroslav@1646:          *
jaroslav@1646:          * For example, a concrete BMH species for two reference and one integral bound values
jaroslav@1646:          * would have the following shape:
jaroslav@1646:          *
jaroslav@1646:          * <pre>
jaroslav@1646:          * class BoundMethodHandle { ... private static
jaroslav@1646:          * final class Species_LLI extends BoundMethodHandle {
jaroslav@1646:          *     final Object argL0;
jaroslav@1646:          *     final Object argL1;
jaroslav@1646:          *     final int argI2;
jaroslav@1646:          *     public Species_LLI(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) {
jaroslav@1646:          *         super(mt, lf);
jaroslav@1646:          *         this.argL0 = argL0;
jaroslav@1646:          *         this.argL1 = argL1;
jaroslav@1646:          *         this.argI2 = argI2;
jaroslav@1646:          *     }
jaroslav@1646:          *     public final SpeciesData speciesData() { return SPECIES_DATA; }
jaroslav@1646:          *     public static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("LLI", Species_LLI.class);
jaroslav@1646:          *     public final BoundMethodHandle clone(MethodType mt, LambdaForm lf) {
jaroslav@1646:          *         return SPECIES_DATA.constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2);
jaroslav@1646:          *     }
jaroslav@1646:          *     public final BoundMethodHandle cloneExtendL(MethodType mt, LambdaForm lf, Object narg) {
jaroslav@1646:          *         return SPECIES_DATA.extendWithIndex(INDEX_L).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
jaroslav@1646:          *     }
jaroslav@1646:          *     public final BoundMethodHandle cloneExtendI(MethodType mt, LambdaForm lf, int narg) {
jaroslav@1646:          *         return SPECIES_DATA.extendWithIndex(INDEX_I).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
jaroslav@1646:          *     }
jaroslav@1646:          *     public final BoundMethodHandle cloneExtendJ(MethodType mt, LambdaForm lf, long narg) {
jaroslav@1646:          *         return SPECIES_DATA.extendWithIndex(INDEX_J).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
jaroslav@1646:          *     }
jaroslav@1646:          *     public final BoundMethodHandle cloneExtendF(MethodType mt, LambdaForm lf, float narg) {
jaroslav@1646:          *         return SPECIES_DATA.extendWithIndex(INDEX_F).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
jaroslav@1646:          *     }
jaroslav@1646:          *     public final BoundMethodHandle cloneExtendD(MethodType mt, LambdaForm lf, double narg) {
jaroslav@1646:          *         return SPECIES_DATA.extendWithIndex(INDEX_D).constructor[0].invokeBasic(mt, lf, argL0, argL1, argI2, narg);
jaroslav@1646:          *     }
jaroslav@1646:          * }
jaroslav@1646:          * </pre>
jaroslav@1646:          *
jaroslav@1646:          * @param types the type signature, wherein reference types are erased to 'L'
jaroslav@1646:          * @return the generated concrete BMH class
jaroslav@1646:          */
jaroslav@1646:         static Class<? extends BoundMethodHandle> generateConcreteBMHClass(String types) {
jaroslav@1646:             final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
jaroslav@1646: 
jaroslav@1646:             final String className  = SPECIES_PREFIX_PATH + types;
jaroslav@1646:             final String sourceFile = SPECIES_PREFIX_NAME + types;
jaroslav@1646:             cw.visit(V1_6, ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, BMH, null);
jaroslav@1646:             cw.visitSource(sourceFile, null);
jaroslav@1646: 
jaroslav@1646:             // emit static types and SPECIES_DATA fields
jaroslav@1646:             cw.visitField(ACC_PUBLIC + ACC_STATIC, "SPECIES_DATA", SPECIES_DATA_SIG, null, null).visitEnd();
jaroslav@1646: 
jaroslav@1646:             // emit bound argument fields
jaroslav@1646:             for (int i = 0; i < types.length(); ++i) {
jaroslav@1646:                 final char t = types.charAt(i);
jaroslav@1646:                 final String fieldName = makeFieldName(types, i);
jaroslav@1646:                 final String fieldDesc = t == 'L' ? JLO_SIG : String.valueOf(t);
jaroslav@1646:                 cw.visitField(ACC_FINAL, fieldName, fieldDesc, null, null).visitEnd();
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             MethodVisitor mv;
jaroslav@1646: 
jaroslav@1646:             // emit constructor
jaroslav@1646:             mv = cw.visitMethod(ACC_PUBLIC, "<init>", makeSignature(types, true), null, null);
jaroslav@1646:             mv.visitCode();
jaroslav@1646:             mv.visitVarInsn(ALOAD, 0);
jaroslav@1646:             mv.visitVarInsn(ALOAD, 1);
jaroslav@1646:             mv.visitVarInsn(ALOAD, 2);
jaroslav@1646: 
jaroslav@1646:             mv.visitMethodInsn(INVOKESPECIAL, BMH, "<init>", makeSignature("", true));
jaroslav@1646: 
jaroslav@1646:             for (int i = 0, j = 0; i < types.length(); ++i, ++j) {
jaroslav@1646:                 // i counts the arguments, j counts corresponding argument slots
jaroslav@1646:                 char t = types.charAt(i);
jaroslav@1646:                 mv.visitVarInsn(ALOAD, 0);
jaroslav@1646:                 mv.visitVarInsn(typeLoadOp(t), j + 3); // parameters start at 3
jaroslav@1646:                 mv.visitFieldInsn(PUTFIELD, className, makeFieldName(types, i), typeSig(t));
jaroslav@1646:                 if (t == 'J' || t == 'D') {
jaroslav@1646:                     ++j; // adjust argument register access
jaroslav@1646:                 }
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             mv.visitInsn(RETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646: 
jaroslav@1646:             // emit implementation of reinvokerTarget()
jaroslav@1646:             mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "reinvokerTarget", "()" + MH_SIG, null, null);
jaroslav@1646:             mv.visitCode();
jaroslav@1646:             mv.visitVarInsn(ALOAD, 0);
jaroslav@1646:             mv.visitFieldInsn(GETFIELD, className, "argL0", JLO_SIG);
jaroslav@1646:             mv.visitTypeInsn(CHECKCAST, MH);
jaroslav@1646:             mv.visitInsn(ARETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646: 
jaroslav@1646:             // emit implementation of speciesData()
jaroslav@1646:             mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "speciesData", MYSPECIES_DATA_SIG, null, null);
jaroslav@1646:             mv.visitCode();
jaroslav@1646:             mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
jaroslav@1646:             mv.visitInsn(ARETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646: 
jaroslav@1646:             // emit clone()
jaroslav@1646:             mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "clone", makeSignature("", false), null, E_THROWABLE);
jaroslav@1646:             mv.visitCode();
jaroslav@1646:             // return speciesData().constructor[0].invokeBasic(mt, lf, argL0, ...)
jaroslav@1646:             // obtain constructor
jaroslav@1646:             mv.visitVarInsn(ALOAD, 0);
jaroslav@1646:             mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
jaroslav@1646:             mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
jaroslav@1646:             mv.visitInsn(ICONST_0);
jaroslav@1646:             mv.visitInsn(AALOAD);
jaroslav@1646:             // load mt, lf
jaroslav@1646:             mv.visitVarInsn(ALOAD, 1);
jaroslav@1646:             mv.visitVarInsn(ALOAD, 2);
jaroslav@1646:             // put fields on the stack
jaroslav@1646:             emitPushFields(types, className, mv);
jaroslav@1646:             // finally, invoke the constructor and return
jaroslav@1646:             mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types, false));
jaroslav@1646:             mv.visitInsn(ARETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646: 
jaroslav@1646:             // for each type, emit cloneExtendT()
jaroslav@1646:             for (Class<?> c : TYPES) {
jaroslav@1646:                 char t = Wrapper.basicTypeChar(c);
jaroslav@1646:                 mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "cloneExtend" + t, makeSignature(String.valueOf(t), false), null, E_THROWABLE);
jaroslav@1646:                 mv.visitCode();
jaroslav@1646:                 // return SPECIES_DATA.extendWithIndex(extensionIndex(t)).constructor[0].invokeBasic(mt, lf, argL0, ..., narg)
jaroslav@1646:                 // obtain constructor
jaroslav@1646:                 mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
jaroslav@1646:                 int iconstInsn = ICONST_0 + extensionIndex(t);
jaroslav@1646:                 assert(iconstInsn <= ICONST_5);
jaroslav@1646:                 mv.visitInsn(iconstInsn);
jaroslav@1646:                 mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "extendWithIndex", BMHSPECIES_DATA_EWI_SIG);
jaroslav@1646:                 mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
jaroslav@1646:                 mv.visitInsn(ICONST_0);
jaroslav@1646:                 mv.visitInsn(AALOAD);
jaroslav@1646:                 // load mt, lf
jaroslav@1646:                 mv.visitVarInsn(ALOAD, 1);
jaroslav@1646:                 mv.visitVarInsn(ALOAD, 2);
jaroslav@1646:                 // put fields on the stack
jaroslav@1646:                 emitPushFields(types, className, mv);
jaroslav@1646:                 // put narg on stack
jaroslav@1646:                 mv.visitVarInsn(typeLoadOp(t), 3);
jaroslav@1646:                 // finally, invoke the constructor and return
jaroslav@1646:                 mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types + t, false));
jaroslav@1646:                 mv.visitInsn(ARETURN);
jaroslav@1646:                 mv.visitMaxs(0, 0);
jaroslav@1646:                 mv.visitEnd();
jaroslav@1646:             }
jaroslav@1646: 
jaroslav@1646:             // emit class initializer
jaroslav@1646:             mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "<clinit>", VOID_SIG, null, null);
jaroslav@1646:             mv.visitCode();
jaroslav@1646:             mv.visitLdcInsn(types);
jaroslav@1646:             mv.visitLdcInsn(Type.getObjectType(className));
jaroslav@1646:             mv.visitMethodInsn(INVOKESTATIC, SPECIES_DATA, "getForClass", BMHSPECIES_DATA_GFC_SIG);
jaroslav@1646:             mv.visitFieldInsn(PUTSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
jaroslav@1646:             mv.visitInsn(RETURN);
jaroslav@1646:             mv.visitMaxs(0, 0);
jaroslav@1646:             mv.visitEnd();
jaroslav@1646: 
jaroslav@1646:             cw.visitEnd();
jaroslav@1646: 
jaroslav@1646:             // load class
jaroslav@1646:             final byte[] classFile = cw.toByteArray();
jaroslav@1646:             InvokerBytecodeGenerator.maybeDump(className, classFile);
jaroslav@1646:             Class<? extends BoundMethodHandle> bmhClass =
jaroslav@1646:                 //UNSAFE.defineAnonymousClass(BoundMethodHandle.class, classFile, null).asSubclass(BoundMethodHandle.class);
jaroslav@1646:                 UNSAFE.defineClass(className, classFile, 0, classFile.length,
jaroslav@1646:                                    BoundMethodHandle.class.getClassLoader(), null)
jaroslav@1646:                     .asSubclass(BoundMethodHandle.class);
jaroslav@1646:             UNSAFE.ensureClassInitialized(bmhClass);
jaroslav@1646: 
jaroslav@1646:             return bmhClass;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private static int typeLoadOp(char t) {
jaroslav@1646:             switch (t) {
jaroslav@1646:             case 'L': return ALOAD;
jaroslav@1646:             case 'I': return ILOAD;
jaroslav@1646:             case 'J': return LLOAD;
jaroslav@1646:             case 'F': return FLOAD;
jaroslav@1646:             case 'D': return DLOAD;
jaroslav@1646:             default : throw new InternalError("unrecognized type " + t);
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private static void emitPushFields(String types, String className, MethodVisitor mv) {
jaroslav@1646:             for (int i = 0; i < types.length(); ++i) {
jaroslav@1646:                 char tc = types.charAt(i);
jaroslav@1646:                 mv.visitVarInsn(ALOAD, 0);
jaroslav@1646:                 mv.visitFieldInsn(GETFIELD, className, makeFieldName(types, i), typeSig(tc));
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static String typeSig(char t) {
jaroslav@1646:             return t == 'L' ? JLO_SIG : String.valueOf(t);
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         //
jaroslav@1646:         // Getter MH generation.
jaroslav@1646:         //
jaroslav@1646: 
jaroslav@1646:         private static MethodHandle makeGetter(Class<?> cbmhClass, String types, int index) {
jaroslav@1646:             String fieldName = makeFieldName(types, index);
jaroslav@1646:             Class<?> fieldType = Wrapper.forBasicType(types.charAt(index)).primitiveType();
jaroslav@1646:             try {
jaroslav@1646:                 return LOOKUP.findGetter(cbmhClass, fieldName, fieldType);
jaroslav@1646:             } catch (NoSuchFieldException | IllegalAccessException e) {
jaroslav@1646:                 throw newInternalError(e);
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static MethodHandle[] makeGetters(Class<?> cbmhClass, String types, MethodHandle[] mhs) {
jaroslav@1646:             if (mhs == null)  mhs = new MethodHandle[types.length()];
jaroslav@1646:             for (int i = 0; i < mhs.length; ++i) {
jaroslav@1646:                 mhs[i] = makeGetter(cbmhClass, types, i);
jaroslav@1646:                 assert(mhs[i].internalMemberName().getDeclaringClass() == cbmhClass);
jaroslav@1646:             }
jaroslav@1646:             return mhs;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static MethodHandle[] makeCtors(Class<? extends BoundMethodHandle> cbmh, String types, MethodHandle mhs[]) {
jaroslav@1646:             if (mhs == null)  mhs = new MethodHandle[1];
jaroslav@1646:             mhs[0] = makeCbmhCtor(cbmh, types);
jaroslav@1646:             return mhs;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         //
jaroslav@1646:         // Auxiliary methods.
jaroslav@1646:         //
jaroslav@1646: 
jaroslav@1646:         static SpeciesData speciesDataFromConcreteBMHClass(Class<? extends BoundMethodHandle> cbmh) {
jaroslav@1646:             try {
jaroslav@1646:                 Field F_SPECIES_DATA = cbmh.getDeclaredField("SPECIES_DATA");
jaroslav@1646:                 return (SpeciesData) F_SPECIES_DATA.get(null);
jaroslav@1646:             } catch (ReflectiveOperationException ex) {
jaroslav@1646:                 throw newInternalError(ex);
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         /**
jaroslav@1646:          * Field names in concrete BMHs adhere to this pattern:
jaroslav@1646:          * arg + type + index
jaroslav@1646:          * where type is a single character (L, I, J, F, D).
jaroslav@1646:          */
jaroslav@1646:         private static String makeFieldName(String types, int index) {
jaroslav@1646:             assert index >= 0 && index < types.length();
jaroslav@1646:             return "arg" + types.charAt(index) + index;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         private static String makeSignature(String types, boolean ctor) {
jaroslav@1646:             StringBuilder buf = new StringBuilder(SIG_INCIPIT);
jaroslav@1646:             for (char c : types.toCharArray()) {
jaroslav@1646:                 buf.append(typeSig(c));
jaroslav@1646:             }
jaroslav@1646:             return buf.append(')').append(ctor ? "V" : BMH_SIG).toString();
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         static MethodHandle makeCbmhCtor(Class<? extends BoundMethodHandle> cbmh, String types) {
jaroslav@1646:             try {
jaroslav@1646:                 return linkConstructor(LOOKUP.findConstructor(cbmh, MethodType.fromMethodDescriptorString(makeSignature(types, true), null)));
jaroslav@1646:             } catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | TypeNotPresentException e) {
jaroslav@1646:                 throw newInternalError(e);
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         /**
jaroslav@1646:          * Wrap a constructor call in a {@link LambdaForm}.
jaroslav@1646:          *
jaroslav@1646:          * If constructors ({@code <init>} methods) are called in LFs, problems might arise if the LFs
jaroslav@1646:          * are turned into bytecode, because the call to the allocator is routed through an MH, and the
jaroslav@1646:          * verifier cannot find a {@code NEW} instruction preceding the {@code INVOKESPECIAL} to
jaroslav@1646:          * {@code <init>}. To avoid this, we add an indirection by invoking {@code <init>} through
jaroslav@1646:          * {@link MethodHandle#linkToSpecial}.
jaroslav@1646:          *
jaroslav@1646:          * The last {@link LambdaForm.Name Name} in the argument's form is expected to be the {@code void}
jaroslav@1646:          * result of the {@code <init>} invocation. This entry is replaced.
jaroslav@1646:          */
jaroslav@1646:         private static MethodHandle linkConstructor(MethodHandle cmh) {
jaroslav@1646:             final LambdaForm lf = cmh.form;
jaroslav@1646:             final int initNameIndex = lf.names.length - 1;
jaroslav@1646:             final Name initName = lf.names[initNameIndex];
jaroslav@1646:             final MemberName ctorMN = initName.function.member;
jaroslav@1646:             final MethodType ctorMT = ctorMN.getInvocationType();
jaroslav@1646: 
jaroslav@1646:             // obtain function member (call target)
jaroslav@1646:             // linker method type replaces initial parameter (BMH species) with BMH to avoid naming a species (anonymous class!)
jaroslav@1646:             final MethodType linkerMT = ctorMT.changeParameterType(0, BoundMethodHandle.class).appendParameterTypes(MemberName.class);
jaroslav@1646:             MemberName linkerMN = new MemberName(MethodHandle.class, "linkToSpecial", linkerMT, REF_invokeStatic);
jaroslav@1646:             try {
jaroslav@1646:                 linkerMN = MemberName.getFactory().resolveOrFail(REF_invokeStatic, linkerMN, null, NoSuchMethodException.class);
jaroslav@1646:                 assert(linkerMN.isStatic());
jaroslav@1646:             } catch (ReflectiveOperationException ex) {
jaroslav@1646:                 throw newInternalError(ex);
jaroslav@1646:             }
jaroslav@1646:             // extend arguments array
jaroslav@1646:             Object[] newArgs = Arrays.copyOf(initName.arguments, initName.arguments.length + 1);
jaroslav@1646:             newArgs[newArgs.length - 1] = ctorMN;
jaroslav@1646:             // replace function
jaroslav@1646:             final NamedFunction nf = new NamedFunction(linkerMN);
jaroslav@1646:             final Name linkedCtor = new Name(nf, newArgs);
jaroslav@1646:             linkedCtor.initIndex(initNameIndex);
jaroslav@1646:             lf.names[initNameIndex] = linkedCtor;
jaroslav@1646:             return cmh;
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static final Lookup LOOKUP = Lookup.IMPL_LOOKUP;
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * All subclasses must provide such a value describing their type signature.
jaroslav@1646:      */
jaroslav@1646:     static final SpeciesData SPECIES_DATA = SpeciesData.EMPTY;
jaroslav@1646: }