jdk-sandbox: comparison src/java.base/share/classes/java/lang/invoke/BoundMethodHandle.java

equal deleted inserted replaced

-:4ebc2e2fb97c
+:71c04702a3d5
+/*
+* Copyright (c) 2008, 2016, 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 jdk.internal.loader.BootLoader;
+import jdk.internal.org.objectweb.asm.ClassWriter;
+import jdk.internal.org.objectweb.asm.FieldVisitor;
+import jdk.internal.org.objectweb.asm.MethodVisitor;
+import jdk.internal.vm.annotation.Stable;
+import sun.invoke.util.ValueConversions;
+import sun.invoke.util.Wrapper;
+import java.lang.invoke.LambdaForm.NamedFunction;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.reflect.Field;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.Function;
+import static java.lang.invoke.LambdaForm.BasicType;
+import static java.lang.invoke.LambdaForm.BasicType.*;
+import static java.lang.invoke.MethodHandleStatics.*;
+import static jdk.internal.org.objectweb.asm.Opcodes.*;
+/**
+* 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 uncaughtException(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 String internalValues() {
+int count = speciesData().fieldCount();
+if (count == 1) {
+return "[" + arg(0) + "]";
+}
+StringBuilder sb = new StringBuilder("[");
+for (int i = 0; i < count; ++i) {
+sb.append("\n  ").append(i).append(": ( ").append(arg(i)).append(" )");
+}
+return sb.append("\n]").toString();
+}
+/*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 uncaughtException(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 = new SpeciesData("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);
+}
+String 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);
+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;
+CACHE.put(types, this);
+Factory.makeCtors(clazz, types, this.constructor);
+Factory.makeGetters(clazz, types, this.getters);
+Factory.makeNominalGetters(types, this.nominalGetters, this.getters);
+}
+}
+private static final ConcurrentMap<String, SpeciesData> CACHE = new ConcurrentHashMap<>();
+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) {
+return CACHE.computeIfAbsent(types, new Function<String, SpeciesData>() {
+@Override
+public SpeciesData apply(String types) {
+Class<? extends BoundMethodHandle> bmhcl = Factory.getConcreteBMHClass(types);
+// SpeciesData instantiation may throw VirtualMachineError because of
+// code cache overflow...
+SpeciesData speciesData = new SpeciesData(types, bmhcl);
+// CHM.computeIfAbsent ensures only one SpeciesData will be set
+// successfully on the concrete BMH class if ever
+Factory.setSpeciesDataToConcreteBMHClass(bmhcl, speciesData);
+// the concrete BMH class is published via SpeciesData instance
+// returned here only after it's SPECIES_DATA field is set
+return speciesData;
+}
+});
+}
+/**
+* This is to be called when assertions are enabled. It checks whether SpeciesData for all of the statically
+* defined species subclasses of BoundMethodHandle has been added to the SpeciesData cache. See below in the
+* static initializer for
+*/
+static boolean speciesDataCachePopulated() {
+Class<BoundMethodHandle> rootCls = BoundMethodHandle.class;
+for (Class<?> c : rootCls.getDeclaredClasses()) {
+if (rootCls.isAssignableFrom(c)) {
+final Class<? extends BoundMethodHandle> cbmh = c.asSubclass(BoundMethodHandle.class);
+SpeciesData d = Factory.getSpeciesDataFromConcreteBMHClass(cbmh);
+assert(d != null) : cbmh.getName();
+assert(d.clazz == cbmh);
+assert(CACHE.get(d.typeChars) == d);
+}
+}
+return true;
+}
+static {
+// Pre-fill the BMH species-data cache with EMPTY and all BMH's inner subclasses.
+EMPTY.initForBootstrap();
+Species_L.SPECIES_DATA.initForBootstrap();
+// check that all static SpeciesData instances have been initialized
+assert speciesDataCachePopulated();
+// 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 {
+private static final String JLO_SIG  = "Ljava/lang/Object;";
+private static final String MH       = "java/lang/invoke/MethodHandle";
+private static final String MH_SIG   = "L"+MH+";";
+private static final String BMH      = "java/lang/invoke/BoundMethodHandle";
+private static final String BMH_NAME = "java.lang.invoke.BoundMethodHandle";
+private static final String BMH_SIG  = "L"+BMH+";";
+private static final String SPECIES_DATA     = "java/lang/invoke/BoundMethodHandle$SpeciesData";
+private static final String SPECIES_DATA_SIG = "L"+SPECIES_DATA+";";
+private static final String STABLE_SIG       = "Ljdk/internal/vm/annotation/Stable;";
+private static final String SPECIES_PREFIX_NAME = "Species_";
+private static final String SPECIES_PREFIX_PATH = BMH + "$" + SPECIES_PREFIX_NAME;
+private static final String SPECIES_CLASS_PREFIX = BMH_NAME + "$" + SPECIES_PREFIX_NAME;
+private static final String BMHSPECIES_DATA_EWI_SIG = "(B)" + SPECIES_DATA_SIG;
+private static final String MYSPECIES_DATA_SIG = "()" + SPECIES_DATA_SIG;
+private static final String INT_SIG    = "()I";
+private static final String SIG_INCIPIT = "(Ljava/lang/invoke/MethodType;Ljava/lang/invoke/LambdaForm;";
+private static final String[] E_THROWABLE = new String[] { "java/lang/Throwable" };
+private static final ConcurrentMap<String, Class<? extends BoundMethodHandle>> CLASS_CACHE = new ConcurrentHashMap<>();
+/**
+* Get a concrete subclass of BMH for a given combination of bound types.
+*
+* @param types the type signature, wherein reference types are erased to 'L'
+* @return the concrete BMH class
+*/
+static Class<? extends BoundMethodHandle> getConcreteBMHClass(String types) {
+// CHM.computeIfAbsent ensures generateConcreteBMHClass is called
+// only once per key.
+return CLASS_CACHE.computeIfAbsent(
+types, new Function<String, Class<? extends BoundMethodHandle>>() {
+@Override
+public Class<? extends BoundMethodHandle> apply(String types) {
+String shortTypes = LambdaForm.shortenSignature(types);
+String className = SPECIES_CLASS_PREFIX + shortTypes;
+Class<?> c = BootLoader.loadClassOrNull(className);
+if (TRACE_RESOLVE) {
+System.out.println("[BMH_RESOLVE] " + shortTypes +
+(c != null ? " (success)" : " (fail)") );
+}
+if (c != null) {
+return c.asSubclass(BoundMethodHandle.class);
+} else {
+// Not pregenerated, generate the class
+return generateConcreteBMHClass(shortTypes, types);
+}
+}
+});
+}
+/**
+* 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; }
+*     &#64;Stable static SpeciesData SPECIES_DATA; // injected afterwards
+*     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 shortTypes,
+String types) {
+final String className  = speciesInternalClassName(shortTypes);
+byte[] classFile = generateConcreteBMHClassBytes(shortTypes, types, className);
+// load class
+InvokerBytecodeGenerator.maybeDump(className, classFile);
+Class<? extends BoundMethodHandle> bmhClass =
+UNSAFE.defineClass(className, classFile, 0, classFile.length,
+BoundMethodHandle.class.getClassLoader(), null)
+.asSubclass(BoundMethodHandle.class);
+return bmhClass;
+}
+static String speciesInternalClassName(String shortTypes) {
+return SPECIES_PREFIX_PATH + shortTypes;
+}
+static byte[] generateConcreteBMHClassBytes(final String shortTypes,
+final String types, final String className) {
+final String sourceFile = SPECIES_PREFIX_NAME + shortTypes;
+final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
+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
+FieldVisitor fw = cw.visitField(NOT_ACC_PUBLIC + ACC_STATIC, "SPECIES_DATA", SPECIES_DATA_SIG, null, null);
+fw.visitAnnotation(STABLE_SIG, true);
+fw.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();
+}
+cw.visitEnd();
+return cw.toByteArray();
+}
+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 getSpeciesDataFromConcreteBMHClass(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);
+}
+}
+static void setSpeciesDataToConcreteBMHClass(Class<? extends BoundMethodHandle> cbmh, SpeciesData speciesData) {
+try {
+Field F_SPECIES_DATA = cbmh.getDeclaredField("SPECIES_DATA");
+// ## FIXME: annotation parser can't create proxy classes until module system is fully initialzed
+// assert F_SPECIES_DATA.getDeclaredAnnotation(Stable.class) != null;
+F_SPECIES_DATA.set(null, speciesData);
+} 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);
+int len = types.length();
+for (int i = 0; i < len; i++) {
+buf.append(typeSig(types.charAt(i)));
+}
+return buf.append(')').append(ctor ? "V" : BMH_SIG).toString();
+}
+private static MethodType makeConstructorType(String types) {
+int length = types.length();
+Class<?> ptypes[] = new Class<?>[length + 2];
+ptypes[0] = MethodType.class;
+ptypes[1] = LambdaForm.class;
+for (int i = 0; i < length; i++) {
+ptypes[i + 2] = BasicType.basicType(types.charAt(i)).basicTypeClass();
+}
+return MethodType.makeImpl(BoundMethodHandle.class, ptypes, true);
+}
+static MethodHandle makeCbmhCtor(Class<? extends BoundMethodHandle> cbmh, String types) {
+try {
+return LOOKUP.findStatic(cbmh, "make", makeConstructorType(types));
+} catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | TypeNotPresentException e) {
+throw newInternalError(e);
+}
+}
+}
+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[6];
+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"); }
+}

changeset 47216	71c04702a3d5
parent 44591	b9bf065070fe
child 47753	a2008587c13f