| /* |
| * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang.invoke; |
| |
| import static jdk.internal.org.objectweb.asm.Opcodes.*; |
| import static java.lang.invoke.LambdaForm.*; |
| import static java.lang.invoke.LambdaForm.BasicType.*; |
| import static java.lang.invoke.MethodHandleStatics.*; |
| |
| 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 jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.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. |
| * |
| * All bound arguments are encapsulated in dedicated species. |
| */ |
| /*non-public*/ abstract class BoundMethodHandle extends MethodHandle { |
| |
| /*non-public*/ BoundMethodHandle(MethodType type, LambdaForm form) { |
| super(type, form); |
| assert(speciesData() == speciesData(form)); |
| } |
| |
| // |
| // BMH API and internals |
| // |
| |
| static BoundMethodHandle bindSingle(MethodType type, LambdaForm form, BasicType xtype, Object x) { |
| // for some type signatures, there exist pre-defined concrete BMH classes |
| try { |
| switch (xtype) { |
| case L_TYPE: |
| return bindSingle(type, form, x); // Use known fast path. |
| case I_TYPE: |
| return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(I_TYPE).constructor().invokeBasic(type, form, ValueConversions.widenSubword(x)); |
| case J_TYPE: |
| return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(J_TYPE).constructor().invokeBasic(type, form, (long) x); |
| case F_TYPE: |
| return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(F_TYPE).constructor().invokeBasic(type, form, (float) x); |
| case D_TYPE: |
| return (BoundMethodHandle) SpeciesData.EMPTY.extendWith(D_TYPE).constructor().invokeBasic(type, form, (double) x); |
| default : throw newInternalError("unexpected xtype: " + xtype); |
| } |
| } catch (Throwable t) { |
| throw newInternalError(t); |
| } |
| } |
| |
| /*non-public*/ |
| LambdaFormEditor editor() { |
| return form.editor(); |
| } |
| |
| static BoundMethodHandle bindSingle(MethodType type, LambdaForm form, Object x) { |
| return Species_L.make(type, form, x); |
| } |
| |
| @Override // there is a default binder in the super class, for 'L' types only |
| /*non-public*/ |
| BoundMethodHandle bindArgumentL(int pos, Object value) { |
| return editor().bindArgumentL(this, pos, value); |
| } |
| /*non-public*/ |
| BoundMethodHandle bindArgumentI(int pos, int value) { |
| return editor().bindArgumentI(this, pos, value); |
| } |
| /*non-public*/ |
| BoundMethodHandle bindArgumentJ(int pos, long value) { |
| return editor().bindArgumentJ(this, pos, value); |
| } |
| /*non-public*/ |
| BoundMethodHandle bindArgumentF(int pos, float value) { |
| return editor().bindArgumentF(this, pos, value); |
| } |
| /*non-public*/ |
| BoundMethodHandle bindArgumentD(int pos, double value) { |
| return editor().bindArgumentD(this, pos, value); |
| } |
| |
| @Override |
| BoundMethodHandle rebind() { |
| if (!tooComplex()) { |
| return this; |
| } |
| return makeReinvoker(this); |
| } |
| |
| private boolean tooComplex() { |
| return (fieldCount() > FIELD_COUNT_THRESHOLD || |
| form.expressionCount() > FORM_EXPRESSION_THRESHOLD); |
| } |
| private static final int FIELD_COUNT_THRESHOLD = 12; // largest convenient BMH field count |
| private static final int FORM_EXPRESSION_THRESHOLD = 24; // largest convenient BMH expression count |
| |
| /** |
| * A reinvoker MH has this form: |
| * {@code lambda (bmh, arg*) { thismh = bmh[0]; invokeBasic(thismh, arg*) }} |
| */ |
| static BoundMethodHandle makeReinvoker(MethodHandle target) { |
| LambdaForm form = DelegatingMethodHandle.makeReinvokerForm( |
| target, MethodTypeForm.LF_REBIND, |
| Species_L.SPECIES_DATA, Species_L.SPECIES_DATA.getterFunction(0)); |
| return Species_L.make(target.type(), form, target); |
| } |
| |
| /** |
| * 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. |
| */ |
| /*non-public*/ abstract SpeciesData speciesData(); |
| |
| /*non-public*/ static SpeciesData speciesData(LambdaForm form) { |
| Object c = form.names[0].constraint; |
| if (c instanceof SpeciesData) |
| return (SpeciesData) c; |
| // if there is no BMH constraint, then use the null constraint |
| return SpeciesData.EMPTY; |
| } |
| |
| /** |
| * Return the number of fields in this BMH. Equivalent to speciesData().fieldCount(). |
| */ |
| /*non-public*/ abstract int fieldCount(); |
| |
| @Override |
| Object internalProperties() { |
| return "\n& BMH="+internalValues(); |
| } |
| |
| @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); |
| } |
| |
| /*non-public*/ final Object arg(int i) { |
| try { |
| switch (speciesData().fieldType(i)) { |
| case L_TYPE: return speciesData().getters[i].invokeBasic(this); |
| case I_TYPE: return (int) speciesData().getters[i].invokeBasic(this); |
| case J_TYPE: return (long) speciesData().getters[i].invokeBasic(this); |
| case F_TYPE: return (float) speciesData().getters[i].invokeBasic(this); |
| case D_TYPE: return (double) speciesData().getters[i].invokeBasic(this); |
| } |
| } catch (Throwable ex) { |
| throw newInternalError(ex); |
| } |
| throw new InternalError("unexpected type: " + speciesData().typeChars+"."+i); |
| } |
| |
| // |
| // cloning API |
| // |
| |
| /*non-public*/ abstract BoundMethodHandle copyWith(MethodType mt, LambdaForm lf); |
| /*non-public*/ abstract BoundMethodHandle copyWithExtendL(MethodType mt, LambdaForm lf, Object narg); |
| /*non-public*/ abstract BoundMethodHandle copyWithExtendI(MethodType mt, LambdaForm lf, int narg); |
| /*non-public*/ abstract BoundMethodHandle copyWithExtendJ(MethodType mt, LambdaForm lf, long narg); |
| /*non-public*/ abstract BoundMethodHandle copyWithExtendF(MethodType mt, LambdaForm lf, float narg); |
| /*non-public*/ abstract BoundMethodHandle copyWithExtendD(MethodType mt, LambdaForm lf, double narg); |
| |
| // |
| // 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; |
| private Species_L(MethodType mt, LambdaForm lf, Object argL0) { |
| super(mt, lf); |
| this.argL0 = argL0; |
| } |
| @Override |
| /*non-public*/ SpeciesData speciesData() { |
| return SPECIES_DATA; |
| } |
| @Override |
| /*non-public*/ int fieldCount() { |
| return 1; |
| } |
| /*non-public*/ static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("L", Species_L.class); |
| /*non-public*/ static BoundMethodHandle make(MethodType mt, LambdaForm lf, Object argL0) { |
| return new Species_L(mt, lf, argL0); |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWith(MethodType mt, LambdaForm lf) { |
| return new Species_L(mt, lf, argL0); |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWithExtendL(MethodType mt, LambdaForm lf, Object narg) { |
| try { |
| return (BoundMethodHandle) SPECIES_DATA.extendWith(L_TYPE).constructor().invokeBasic(mt, lf, argL0, narg); |
| } catch (Throwable ex) { |
| throw uncaughtException(ex); |
| } |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWithExtendI(MethodType mt, LambdaForm lf, int narg) { |
| try { |
| return (BoundMethodHandle) SPECIES_DATA.extendWith(I_TYPE).constructor().invokeBasic(mt, lf, argL0, narg); |
| } catch (Throwable ex) { |
| throw uncaughtException(ex); |
| } |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWithExtendJ(MethodType mt, LambdaForm lf, long narg) { |
| try { |
| return (BoundMethodHandle) SPECIES_DATA.extendWith(J_TYPE).constructor().invokeBasic(mt, lf, argL0, narg); |
| } catch (Throwable ex) { |
| throw uncaughtException(ex); |
| } |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWithExtendF(MethodType mt, LambdaForm lf, float narg) { |
| try { |
| return (BoundMethodHandle) SPECIES_DATA.extendWith(F_TYPE).constructor().invokeBasic(mt, lf, argL0, narg); |
| } catch (Throwable ex) { |
| throw uncaughtException(ex); |
| } |
| } |
| @Override |
| /*non-public*/ final BoundMethodHandle copyWithExtendD(MethodType mt, LambdaForm lf, double narg) { |
| try { |
| return (BoundMethodHandle) SPECIES_DATA.extendWith(D_TYPE).constructor().invokeBasic(mt, lf, argL0, narg); |
| } catch (Throwable ex) { |
| throw uncaughtException(ex); |
| } |
| } |
| } |
| |
| // |
| // BMH species meta-data |
| // |
| |
| /** |
| * Meta-data wrapper for concrete BMH types. |
| * Each BMH type corresponds to a given sequence of basic field types (LIJFD). |
| * The fields are immutable; their values are fully specified at object construction. |
| * Each BMH type supplies an array of getter functions which may be used in lambda forms. |
| * A BMH is constructed by cloning a shorter BMH and adding one or more new field values. |
| * The shortest possible BMH has zero fields; its class is SimpleMethodHandle. |
| * BMH species are not interrelated by subtyping, even though it would appear that |
| * a shorter BMH could serve as a supertype of a longer one which extends it. |
| */ |
| static class SpeciesData { |
| private final String typeChars; |
| private final BasicType[] typeCodes; |
| private 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. |
| @Stable private final MethodHandle[] constructor; |
| @Stable private final MethodHandle[] getters; |
| @Stable private final NamedFunction[] nominalGetters; |
| @Stable private final SpeciesData[] extensions; |
| |
| /*non-public*/ int fieldCount() { |
| return typeCodes.length; |
| } |
| /*non-public*/ BasicType fieldType(int i) { |
| return typeCodes[i]; |
| } |
| /*non-public*/ char fieldTypeChar(int i) { |
| return typeChars.charAt(i); |
| } |
| Object fieldSignature() { |
| return typeChars; |
| } |
| public Class<? extends BoundMethodHandle> fieldHolder() { |
| return clazz; |
| } |
| public String toString() { |
| return "SpeciesData<"+fieldSignature()+">"; |
| } |
| |
| /** |
| * 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. |
| */ |
| NamedFunction getterFunction(int i) { |
| NamedFunction nf = nominalGetters[i]; |
| assert(nf.memberDeclaringClassOrNull() == fieldHolder()); |
| assert(nf.returnType() == fieldType(i)); |
| return nf; |
| } |
| |
| NamedFunction[] getterFunctions() { |
| return nominalGetters; |
| } |
| |
| MethodHandle[] getterHandles() { return getters; } |
| |
| MethodHandle constructor() { |
| return constructor[0]; |
| } |
| |
| static final SpeciesData EMPTY = new SpeciesData("", BoundMethodHandle.class); |
| |
| private SpeciesData(String types, Class<? extends BoundMethodHandle> clazz) { |
| this.typeChars = types; |
| this.typeCodes = basicTypes(types); |
| this.clazz = clazz; |
| if (!INIT_DONE) { |
| this.constructor = new MethodHandle[1]; // only one ctor |
| this.getters = new MethodHandle[types.length()]; |
| this.nominalGetters = new NamedFunction[types.length()]; |
| } else { |
| this.constructor = Factory.makeCtors(clazz, types, null); |
| this.getters = Factory.makeGetters(clazz, types, null); |
| this.nominalGetters = Factory.makeNominalGetters(types, null, this.getters); |
| } |
| this.extensions = new SpeciesData[ARG_TYPE_LIMIT]; |
| } |
| |
| private void initForBootstrap() { |
| assert(!INIT_DONE); |
| if (constructor() == null) { |
| String types = typeChars; |
| Factory.makeCtors(clazz, types, this.constructor); |
| Factory.makeGetters(clazz, types, this.getters); |
| Factory.makeNominalGetters(types, this.nominalGetters, this.getters); |
| } |
| } |
| |
| private SpeciesData(String typeChars) { |
| // Placeholder only. |
| this.typeChars = typeChars; |
| this.typeCodes = basicTypes(typeChars); |
| this.clazz = null; |
| this.constructor = null; |
| this.getters = null; |
| this.nominalGetters = null; |
| this.extensions = null; |
| } |
| private boolean isPlaceholder() { return clazz == null; } |
| |
| private static final HashMap<String, SpeciesData> CACHE = new HashMap<>(); |
| static { CACHE.put("", EMPTY); } // make bootstrap predictable |
| private static final boolean INIT_DONE; // set after <clinit> finishes... |
| |
| SpeciesData extendWith(byte type) { |
| return extendWith(BasicType.basicType(type)); |
| } |
| |
| SpeciesData extendWith(BasicType type) { |
| int ord = type.ordinal(); |
| SpeciesData d = extensions[ord]; |
| if (d != null) return d; |
| extensions[ord] = d = get(typeChars+type.basicTypeChar()); |
| return d; |
| } |
| |
| private static SpeciesData get(String types) { |
| // Acquire cache lock for query. |
| SpeciesData d = lookupCache(types); |
| if (!d.isPlaceholder()) |
| return d; |
| synchronized (d) { |
| // Use synch. on the placeholder to prevent multiple instantiation of one species. |
| // Creating this class forces a recursive call to getForClass. |
| if (lookupCache(types).isPlaceholder()) |
| Factory.generateConcreteBMHClass(types); |
| } |
| // Reacquire cache lock. |
| d = lookupCache(types); |
| // Class loading must have upgraded the cache. |
| assert(d != null && !d.isPlaceholder()); |
| if (OBSERVE_BMH_SPECIES_CREATION) { |
| if (d == null) { |
| throw new IllegalStateException("d == null"); |
| } |
| if (d.isPlaceholder()) { |
| throw new IllegalStateException("d is place holder"); |
| } |
| } |
| 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()); |
| if (OBSERVE_BMH_SPECIES_CREATION && !d.isPlaceholder()) { |
| throw new IllegalStateException("d is not place holder"); |
| } |
| 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()); |
| if (OBSERVE_BMH_SPECIES_CREATION) { |
| d2 = CACHE.get(types); |
| if (d2 != null && !d2.isPlaceholder()) { |
| throw new IllegalStateException("non-null d2 is not place holder"); |
| } |
| if (d.isPlaceholder()) { |
| throw new IllegalStateException("d is place holder"); |
| } |
| } |
| CACHE.put(types, d); |
| return d; |
| } |
| |
| static { |
| // pre-fill the BMH speciesdata cache with BMH's inner classes |
| final Class<BoundMethodHandle> rootCls = BoundMethodHandle.class; |
| 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.typeChars)); |
| } |
| } |
| } catch (Throwable e) { |
| throw newInternalError(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); |
| } |
| |
| /** |
| * 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 INT_SIG = "()I"; |
| |
| static final String SIG_INCIPIT = "(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;"; |
| |
| 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; |
| * private Species_LLI(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) { |
| * super(mt, lf); |
| * this.argL0 = argL0; |
| * this.argL1 = argL1; |
| * this.argI2 = argI2; |
| * } |
| * final SpeciesData speciesData() { return SPECIES_DATA; } |
| * final int fieldCount() { return 3; } |
| * static final SpeciesData SPECIES_DATA = SpeciesData.getForClass("LLI", Species_LLI.class); |
| * static BoundMethodHandle make(MethodType mt, LambdaForm lf, Object argL0, Object argL1, int argI2) { |
| * return new Species_LLI(mt, lf, argL0, argL1, argI2); |
| * } |
| * final BoundMethodHandle copyWith(MethodType mt, LambdaForm lf) { |
| * return new Species_LLI(mt, lf, argL0, argL1, argI2); |
| * } |
| * final BoundMethodHandle copyWithExtendL(MethodType mt, LambdaForm lf, Object narg) { |
| * return SPECIES_DATA.extendWith(L_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg); |
| * } |
| * final BoundMethodHandle copyWithExtendI(MethodType mt, LambdaForm lf, int narg) { |
| * return SPECIES_DATA.extendWith(I_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg); |
| * } |
| * final BoundMethodHandle copyWithExtendJ(MethodType mt, LambdaForm lf, long narg) { |
| * return SPECIES_DATA.extendWith(J_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg); |
| * } |
| * final BoundMethodHandle copyWithExtendF(MethodType mt, LambdaForm lf, float narg) { |
| * return SPECIES_DATA.extendWith(F_TYPE).constructor().invokeBasic(mt, lf, argL0, argL1, argI2, narg); |
| * } |
| * public final BoundMethodHandle copyWithExtendD(MethodType mt, LambdaForm lf, double narg) { |
| * return SPECIES_DATA.extendWith(D_TYPE).constructor().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); |
| |
| String shortTypes = LambdaForm.shortenSignature(types); |
| final String className = SPECIES_PREFIX_PATH + shortTypes; |
| final String sourceFile = SPECIES_PREFIX_NAME + shortTypes; |
| final int NOT_ACC_PUBLIC = 0; // not ACC_PUBLIC |
| cw.visit(V1_6, NOT_ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, BMH, null); |
| cw.visitSource(sourceFile, null); |
| |
| // emit static types and SPECIES_DATA fields |
| cw.visitField(NOT_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_PRIVATE, "<init>", makeSignature(types, true), null, null); |
| mv.visitCode(); |
| mv.visitVarInsn(ALOAD, 0); // this |
| mv.visitVarInsn(ALOAD, 1); // type |
| mv.visitVarInsn(ALOAD, 2); // form |
| |
| mv.visitMethodInsn(INVOKESPECIAL, BMH, "<init>", makeSignature("", true), false); |
| |
| 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 |
| } |
| } |
| |
| mv.visitInsn(RETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| // emit implementation of speciesData() |
| mv = cw.visitMethod(NOT_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 implementation of fieldCount() |
| mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "fieldCount", INT_SIG, null, null); |
| mv.visitCode(); |
| int fc = types.length(); |
| if (fc <= (ICONST_5 - ICONST_0)) { |
| mv.visitInsn(ICONST_0 + fc); |
| } else { |
| mv.visitIntInsn(SIPUSH, fc); |
| } |
| mv.visitInsn(IRETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| // emit make() ...factory method wrapping constructor |
| mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_STATIC, "make", makeSignature(types, false), null, null); |
| mv.visitCode(); |
| // make instance |
| mv.visitTypeInsn(NEW, className); |
| mv.visitInsn(DUP); |
| // load mt, lf |
| mv.visitVarInsn(ALOAD, 0); // type |
| mv.visitVarInsn(ALOAD, 1); // form |
| // load factory method arguments |
| 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(typeLoadOp(t), j + 2); // parameters start at 3 |
| if (t == 'J' || t == 'D') { |
| ++j; // adjust argument register access |
| } |
| } |
| |
| // finally, invoke the constructor and return |
| mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", makeSignature(types, true), false); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| // emit copyWith() |
| mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "copyWith", makeSignature("", false), null, null); |
| mv.visitCode(); |
| // make instance |
| mv.visitTypeInsn(NEW, className); |
| mv.visitInsn(DUP); |
| // 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(INVOKESPECIAL, className, "<init>", makeSignature(types, true), false); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| // for each type, emit copyWithExtendT() |
| for (BasicType type : BasicType.ARG_TYPES) { |
| int ord = type.ordinal(); |
| char btChar = type.basicTypeChar(); |
| mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "copyWithExtend" + btChar, makeSignature(String.valueOf(btChar), false), null, E_THROWABLE); |
| mv.visitCode(); |
| // return SPECIES_DATA.extendWith(t).constructor().invokeBasic(mt, lf, argL0, ..., narg) |
| // obtain constructor |
| mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG); |
| int iconstInsn = ICONST_0 + ord; |
| assert(iconstInsn <= ICONST_5); |
| mv.visitInsn(iconstInsn); |
| mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "extendWith", BMHSPECIES_DATA_EWI_SIG, false); |
| mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "constructor", "()" + MH_SIG, false); |
| // 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(btChar), 3); |
| // finally, invoke the constructor and return |
| mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types + btChar, false), false); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| } |
| |
| // emit class initializer |
| mv = cw.visitMethod(NOT_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, false); |
| 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, |
| BoundMethodHandle.class.getClassLoader(), null) |
| .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 newInternalError("unrecognized type " + t); |
| } |
| } |
| |
| 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 newInternalError(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]; |
| if (types.equals("")) return mhs; // hack for empty BMH species |
| mhs[0] = makeCbmhCtor(cbmh, types); |
| return mhs; |
| } |
| |
| static NamedFunction[] makeNominalGetters(String types, NamedFunction[] nfs, MethodHandle[] getters) { |
| if (nfs == null) nfs = new NamedFunction[types.length()]; |
| for (int i = 0; i < nfs.length; ++i) { |
| nfs[i] = new NamedFunction(getters[i]); |
| } |
| return nfs; |
| } |
| |
| // |
| // 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 newInternalError(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 LOOKUP.findStatic(cbmh, "make", MethodType.fromDescriptor(makeSignature(types, false), null)); |
| } catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | TypeNotPresentException e) { |
| throw newInternalError(e); |
| } |
| } |
| } |
| |
| 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; |
| |
| private static final SpeciesData[] SPECIES_DATA_CACHE = new SpeciesData[5]; |
| private static SpeciesData checkCache(int size, String types) { |
| int idx = size - 1; |
| SpeciesData data = SPECIES_DATA_CACHE[idx]; |
| if (data != null) return data; |
| SPECIES_DATA_CACHE[idx] = data = getSpeciesData(types); |
| return data; |
| } |
| static SpeciesData speciesData_L() { return checkCache(1, "L"); } |
| static SpeciesData speciesData_LL() { return checkCache(2, "LL"); } |
| static SpeciesData speciesData_LLL() { return checkCache(3, "LLL"); } |
| static SpeciesData speciesData_LLLL() { return checkCache(4, "LLLL"); } |
| static SpeciesData speciesData_LLLLL() { return checkCache(5, "LLLLL"); } |
| } |
