mirror of
https://github.com/openjdk/jdk.git
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1662 lines
73 KiB
Java
1662 lines
73 KiB
Java
/*
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* Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import sun.invoke.util.VerifyAccess;
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import sun.invoke.util.VerifyType;
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import sun.invoke.util.Wrapper;
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.RuntimeVisibleAnnotationsAttribute;
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import java.lang.classfile.attribute.SourceFileAttribute;
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import java.lang.classfile.constantpool.ClassEntry;
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import java.lang.classfile.constantpool.ConstantPoolBuilder;
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import java.lang.classfile.constantpool.FieldRefEntry;
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import java.lang.classfile.instruction.SwitchCase;
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import java.lang.constant.ClassDesc;
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import java.lang.constant.ConstantDesc;
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import java.lang.constant.MethodTypeDesc;
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import java.lang.invoke.LambdaForm.BasicType;
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import java.lang.invoke.LambdaForm.Name;
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import java.lang.invoke.LambdaForm.NamedFunction;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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import java.util.function.Consumer;
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import java.util.stream.Stream;
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import jdk.internal.constant.MethodTypeDescImpl;
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import jdk.internal.constant.ReferenceClassDescImpl;
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import static java.lang.classfile.ClassFile.*;
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import static java.lang.constant.ConstantDescs.*;
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import static java.lang.invoke.LambdaForm.*;
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import static java.lang.invoke.LambdaForm.BasicType.*;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandleStatics.*;
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
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import static jdk.internal.constant.ConstantUtils.concat;
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import static jdk.internal.constant.ConstantUtils.validateInternalClassName;
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/**
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* Code generation backend for LambdaForm.
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* <p>
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* @author John Rose, JSR 292 EG
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*/
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class InvokerBytecodeGenerator {
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/** Define class names for convenience. */
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private static final ClassDesc CD_CasesHolder = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/MethodHandleImpl$CasesHolder;");
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private static final ClassDesc CD_DirectMethodHandle = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/DirectMethodHandle;");
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private static final ClassDesc CD_MemberName = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/MemberName;");
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private static final ClassDesc CD_MethodHandleImpl = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/MethodHandleImpl;");
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private static final ClassDesc CD_LambdaForm = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/LambdaForm;");
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private static final ClassDesc CD_LambdaForm_Name = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/LambdaForm$Name;");
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private static final ClassDesc CD_LoopClauses = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/MethodHandleImpl$LoopClauses;");
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private static final ClassDesc CD_Object_array = ReferenceClassDescImpl.ofValidated("[Ljava/lang/Object;");
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private static final ClassDesc CD_MethodHandle_array = ReferenceClassDescImpl.ofValidated("[Ljava/lang/invoke/MethodHandle;");
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private static final ClassDesc CD_MethodHandle_array2 = ReferenceClassDescImpl.ofValidated("[[Ljava/lang/invoke/MethodHandle;");
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private static final MethodTypeDesc MTD_boolean_Object = MethodTypeDescImpl.ofValidated(CD_boolean, CD_Object);
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private static final MethodTypeDesc MTD_Object_int = MethodTypeDescImpl.ofValidated(CD_Object, CD_int);
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private static final MethodTypeDesc MTD_Object_Class = MethodTypeDescImpl.ofValidated(CD_Object, CD_Class);
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private static final MethodTypeDesc MTD_Object_Object = MethodTypeDescImpl.ofValidated(CD_Object, CD_Object);
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private static final String CLASS_PREFIX = "java/lang/invoke/LambdaForm$";
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private static final String SOURCE_PREFIX = "LambdaForm$";
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/** Name of its super class*/
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static final ClassDesc INVOKER_SUPER_DESC = CD_Object;
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/** Name of new class */
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private final String name;
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private final String className;
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private final ConstantPoolBuilder pool = ConstantPoolBuilder.of();
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private final ClassEntry classEntry;
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private final LambdaForm lambdaForm;
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private final String invokerName;
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private final MethodType invokerType;
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/** Info about local variables in compiled lambda form */
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private int[] localsMap; // index
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private Class<?>[] localClasses; // type
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private final List<ClassData> classData = new ArrayList<>();
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private static final MemberName.Factory MEMBERNAME_FACTORY = MemberName.getFactory();
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private static final Class<?> HOST_CLASS = LambdaForm.class;
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private static final MethodHandles.Lookup LOOKUP = lookup();
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private static MethodHandles.Lookup lookup() {
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try {
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return MethodHandles.privateLookupIn(HOST_CLASS, IMPL_LOOKUP);
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} catch (IllegalAccessException e) {
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throw newInternalError(e);
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}
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}
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/** Main constructor; other constructors delegate to this one. */
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private InvokerBytecodeGenerator(LambdaForm lambdaForm, int localsMapSize,
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String name, String invokerName, MethodType invokerType) {
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int p = invokerName.indexOf('.');
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if (p > -1) {
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name = invokerName.substring(0, p);
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invokerName = invokerName.substring(p + 1);
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}
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if (dumper().isEnabled()) {
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name = makeDumpableClassName(name);
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}
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this.name = name;
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this.className = CLASS_PREFIX.concat(name);
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validateInternalClassName(name);
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this.classEntry = pool.classEntry(ReferenceClassDescImpl.ofValidated(concat("L", className, ";")));
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this.lambdaForm = lambdaForm;
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this.invokerName = invokerName;
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this.invokerType = invokerType;
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this.localsMap = new int[localsMapSize+1]; // last entry of localsMap is count of allocated local slots
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this.localClasses = new Class<?>[localsMapSize+1];
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}
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/** For generating LambdaForm interpreter entry points. */
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private InvokerBytecodeGenerator(String name, String invokerName, MethodType invokerType) {
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this(null, invokerType.parameterCount(),
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name, invokerName, invokerType);
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MethodType mt = invokerType.erase();
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// Create an array to map name indexes to locals indexes.
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localsMap[0] = 0; // localsMap has at least one element
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for (int i = 1, index = 0; i < localsMap.length; i++) {
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Class<?> cl = mt.parameterType(i - 1);
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index += (cl == long.class || cl == double.class) ? 2 : 1;
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localsMap[i] = index;
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}
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}
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/** For generating customized code for a single LambdaForm. */
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private InvokerBytecodeGenerator(String name, LambdaForm form, MethodType invokerType) {
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this(name, form.lambdaName(), form, invokerType);
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}
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/** For generating customized code for a single LambdaForm. */
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InvokerBytecodeGenerator(String name, String invokerName,
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LambdaForm form, MethodType invokerType) {
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this(form, form.names.length,
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name, invokerName, invokerType);
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// Create an array to map name indexes to locals indexes.
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Name[] names = form.names;
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for (int i = 0, index = 0; i < localsMap.length; i++) {
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localsMap[i] = index;
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if (i < names.length) {
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BasicType type = names[i].type();
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index += type.basicTypeSlots();
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}
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}
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}
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/** instance counters for dumped classes */
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private static final HashMap<String,Integer> DUMP_CLASS_FILES_COUNTERS =
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dumper().isEnabled() ? new HashMap<>(): null;
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private static String makeDumpableClassName(String className) {
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Integer ctr;
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synchronized (DUMP_CLASS_FILES_COUNTERS) {
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ctr = DUMP_CLASS_FILES_COUNTERS.get(className);
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if (ctr == null) ctr = 0;
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DUMP_CLASS_FILES_COUNTERS.put(className, ctr+1);
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}
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var buf = new StringBuilder(className.length() + 3).append(className);
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int ctrVal = ctr;
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if (ctrVal < 10) {
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buf.repeat('0', 2);
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} else if (ctrVal < 100) {
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buf.append('0');
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}
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buf.append(ctrVal);
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return buf.toString();
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}
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record ClassData(FieldRefEntry field, Object value) {}
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FieldRefEntry classData(ClassFileBuilder<?, ?> cfb, Object arg, ClassDesc desc) {
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// unique static variable name
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String name;
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List<ClassData> classData = this.classData;
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if (dumper().isEnabled()) {
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Class<?> c = arg.getClass();
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while (c.isArray()) {
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c = c.getComponentType();
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}
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name = "_DATA_" + c.getSimpleName() + "_" + classData.size();
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} else {
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name = "_D_" + classData.size();
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}
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var field = pool.fieldRefEntry(classEntry, pool.nameAndTypeEntry(name, desc));
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classData.add(new ClassData(field, arg));
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return field;
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}
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/**
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* Extract the MemberName of a newly-defined method.
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*/
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private MemberName loadMethod(byte[] classFile) {
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Class<?> invokerClass = LOOKUP.makeHiddenClassDefiner(className, classFile, dumper())
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.defineClass(true, classDataValues());
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return resolveInvokerMember(invokerClass, invokerName, invokerType);
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}
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private static MemberName resolveInvokerMember(Class<?> invokerClass, String name, MethodType type) {
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MemberName member = new MemberName(invokerClass, name, type, REF_invokeStatic);
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try {
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member = MEMBERNAME_FACTORY.resolveOrFail(REF_invokeStatic, member,
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HOST_CLASS, LM_TRUSTED,
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ReflectiveOperationException.class);
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} catch (ReflectiveOperationException e) {
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throw newInternalError(e);
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}
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return member;
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}
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/**
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* Set up class file generation.
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*/
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private byte[] classFileSetup(Consumer<? super ClassBuilder> config) {
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try {
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return ClassFile.of().build(classEntry, pool, new Consumer<>() {
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@Override
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public void accept(ClassBuilder clb) {
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clb.withFlags(ACC_ABSTRACT | ACC_SUPER)
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.withSuperclass(INVOKER_SUPER_DESC)
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.with(SourceFileAttribute.of(clb.constantPool().utf8Entry(SOURCE_PREFIX + name)));
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config.accept(clb);
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}
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});
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} catch (RuntimeException e) {
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throw new BytecodeGenerationException(e);
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}
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}
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private void methodSetup(ClassBuilder clb, Consumer<? super MethodBuilder> config) {
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var invokerDesc = methodDesc(invokerType);
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clb.withMethod(invokerName, invokerDesc, ACC_STATIC, config);
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}
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/**
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* Returns the class data object that will be passed to `Lookup.defineHiddenClassWithClassData`.
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* The classData is loaded in the <clinit> method of the generated class.
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* If the class data contains only one single object, this method returns that single object.
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* If the class data contains more than one objects, this method returns a List.
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*
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* This method returns null if no class data.
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*/
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private Object classDataValues() {
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final List<ClassData> cd = classData;
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int size = cd.size();
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return switch (size) {
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case 0 -> null; // special case (classData is not used by <clinit>)
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case 1 -> cd.get(0).value; // special case (single object)
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case 2 -> List.of(cd.get(0).value, cd.get(1).value);
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case 3 -> List.of(cd.get(0).value, cd.get(1).value, cd.get(2).value);
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case 4 -> List.of(cd.get(0).value, cd.get(1).value, cd.get(2).value, cd.get(3).value);
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default -> {
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Object[] data = new Object[size];
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for (int i = 0; i < size; i++) {
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data[i] = classData.get(i).value;
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}
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yield List.of(data);
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}
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};
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}
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/*
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* <clinit> to initialize the static final fields with the live class data
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* LambdaForms can't use condy due to bootstrapping issue.
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*/
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static void clinit(ClassBuilder clb, ClassEntry classEntry, List<ClassData> classData) {
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if (classData.isEmpty())
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return;
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clb.withMethodBody(CLASS_INIT_NAME, MTD_void, ACC_STATIC, new Consumer<>() {
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@Override
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public void accept(CodeBuilder cob) {
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cob.ldc(classEntry)
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.invokestatic(CD_MethodHandles, "classData", MTD_Object_Class);
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int size = classData.size();
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if (size == 1) {
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var field = classData.getFirst().field;
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// add the static field
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clb.withField(field.name(), field.type(), ACC_STATIC | ACC_FINAL);
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var ft = field.typeSymbol();
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if (ft != CD_Object)
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cob.checkcast(ft);
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cob.putstatic(field);
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} else {
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cob.checkcast(CD_List)
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.astore(0);
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int index = 0;
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var listGet = cob.constantPool().interfaceMethodRefEntry(CD_List, "get", MTD_Object_int);
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for (int i = 0; i < size; i++) {
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var field = classData.get(i).field;
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// add the static field
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clb.withField(field.name(), field.type(), ACC_STATIC | ACC_FINAL);
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// initialize the static field
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cob.aload(0)
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.loadConstant(index++)
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.invokeinterface(listGet);
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var ft = field.typeSymbol();
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if (ft != CD_Object)
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cob.checkcast(ft);
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cob.putstatic(field);
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}
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}
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cob.return_();
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}
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});
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}
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private void emitLoadInsn(CodeBuilder cob, TypeKind type, int index) {
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cob.loadLocal(type, localsMap[index]);
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}
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private void emitStoreInsn(CodeBuilder cob, TypeKind type, int index) {
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cob.storeLocal(type, localsMap[index]);
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}
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/**
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* Emit a boxing call.
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*/
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private void emitBoxing(CodeBuilder cob, TypeKind tk) {
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TypeConvertingMethodAdapter.box(cob, tk);
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}
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/**
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* Emit an unboxing call (plus preceding checkcast).
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*/
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private void emitUnboxing(CodeBuilder cob, TypeKind target) {
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switch (target) {
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case BOOLEAN -> emitReferenceCast(cob, Boolean.class, null);
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case CHAR -> emitReferenceCast(cob, Character.class, null);
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case BYTE, DOUBLE, FLOAT, INT, LONG, SHORT ->
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emitReferenceCast(cob, Number.class, null);
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default -> {}
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}
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TypeConvertingMethodAdapter.unbox(cob, target);
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}
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/**
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* Emit an implicit conversion for an argument which must be of the given pclass.
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* This is usually a no-op, except when pclass is a subword type or a reference other than Object or an interface.
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*
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* @param ptype type of value present on stack
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* @param pclass type of value required on stack
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* @param arg compile-time representation of value on stack (Node, constant) or null if none
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*/
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private void emitImplicitConversion(CodeBuilder cob, BasicType ptype, Class<?> pclass, Object arg) {
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assert(basicType(pclass) == ptype); // boxing/unboxing handled by caller
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if (pclass == ptype.basicTypeClass() && ptype != L_TYPE)
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return; // nothing to do
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switch (ptype) {
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case L_TYPE:
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if (VerifyType.isNullConversion(Object.class, pclass, false)) {
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if (PROFILE_LEVEL > 0)
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emitReferenceCast(cob, Object.class, arg);
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return;
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}
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emitReferenceCast(cob, pclass, arg);
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return;
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case I_TYPE:
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if (!VerifyType.isNullConversion(int.class, pclass, false))
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emitPrimCast(cob, ptype.basicTypeKind(), TypeKind.from(pclass));
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return;
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}
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throw newInternalError("bad implicit conversion: tc="+ptype+": "+pclass);
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}
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/** Update localClasses type map. Return true if the information is already present. */
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private boolean assertStaticType(Class<?> cls, Name n) {
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int local = n.index();
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Class<?> aclass = localClasses[local];
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if (aclass != null && (aclass == cls || cls.isAssignableFrom(aclass))) {
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return true; // type info is already present
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} else if (aclass == null || aclass.isAssignableFrom(cls)) {
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localClasses[local] = cls; // type info can be improved
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}
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return false;
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}
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private void emitReferenceCast(CodeBuilder cob, Class<?> cls, Object arg) {
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Name writeBack = null; // local to write back result
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if (arg instanceof Name n) {
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if (lambdaForm.useCount(n) > 1) {
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// This guy gets used more than once.
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writeBack = n;
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if (assertStaticType(cls, n)) {
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return; // this cast was already performed
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}
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}
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}
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if (isStaticallyNameable(cls)) {
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ClassDesc sig = classDesc(cls);
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cob.checkcast(sig);
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} else {
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cob.getstatic(classData(cob, cls, CD_Class))
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.swap()
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.invokevirtual(CD_Class, "cast", MTD_Object_Object);
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if (Object[].class.isAssignableFrom(cls))
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cob.checkcast(CD_Object_array);
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else if (PROFILE_LEVEL > 0)
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cob.checkcast(CD_Object);
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}
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if (writeBack != null) {
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cob.dup();
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emitStoreInsn(cob, TypeKind.REFERENCE, writeBack.index());
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}
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}
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private static MemberName resolveFrom(String name, MethodType type, Class<?> holder) {
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assert(!UNSAFE.shouldBeInitialized(holder)) : holder + "not initialized";
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MemberName member = new MemberName(holder, name, type, REF_invokeStatic);
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MemberName resolvedMember = MemberName.getFactory().resolveOrNull(REF_invokeStatic, member, holder, LM_TRUSTED);
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traceLambdaForm(name, type, holder, resolvedMember);
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return resolvedMember;
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}
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private static MemberName lookupPregenerated(LambdaForm form, MethodType invokerType) {
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if (form.customized != null) {
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// No pre-generated version for customized LF
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return null;
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}
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String name = form.kind.methodName;
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switch (form.kind) {
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case BOUND_REINVOKER: {
|
|
name = name + "_" + BoundMethodHandle.speciesDataFor(form).key();
|
|
return resolveFrom(name, invokerType, DelegatingMethodHandle.Holder.class);
|
|
}
|
|
case DELEGATE: return resolveFrom(name, invokerType, DelegatingMethodHandle.Holder.class);
|
|
case ZERO: // fall-through
|
|
case IDENTITY: {
|
|
name = name + "_" + form.returnType().basicTypeChar();
|
|
return resolveFrom(name, invokerType, LambdaForm.Holder.class);
|
|
}
|
|
case EXACT_INVOKER: // fall-through
|
|
case EXACT_LINKER: // fall-through
|
|
case LINK_TO_CALL_SITE: // fall-through
|
|
case LINK_TO_TARGET_METHOD: // fall-through
|
|
case GENERIC_INVOKER: // fall-through
|
|
case GENERIC_LINKER: return resolveFrom(name, invokerType, Invokers.Holder.class);
|
|
case GET_REFERENCE: // fall-through
|
|
case GET_BOOLEAN: // fall-through
|
|
case GET_BYTE: // fall-through
|
|
case GET_CHAR: // fall-through
|
|
case GET_SHORT: // fall-through
|
|
case GET_INT: // fall-through
|
|
case GET_LONG: // fall-through
|
|
case GET_FLOAT: // fall-through
|
|
case GET_DOUBLE: // fall-through
|
|
case PUT_REFERENCE: // fall-through
|
|
case PUT_BOOLEAN: // fall-through
|
|
case PUT_BYTE: // fall-through
|
|
case PUT_CHAR: // fall-through
|
|
case PUT_SHORT: // fall-through
|
|
case PUT_INT: // fall-through
|
|
case PUT_LONG: // fall-through
|
|
case PUT_FLOAT: // fall-through
|
|
case PUT_DOUBLE: // fall-through
|
|
case DIRECT_NEW_INVOKE_SPECIAL: // fall-through
|
|
case DIRECT_INVOKE_INTERFACE: // fall-through
|
|
case DIRECT_INVOKE_SPECIAL: // fall-through
|
|
case DIRECT_INVOKE_SPECIAL_IFC: // fall-through
|
|
case DIRECT_INVOKE_STATIC: // fall-through
|
|
case DIRECT_INVOKE_STATIC_INIT: // fall-through
|
|
case DIRECT_INVOKE_VIRTUAL: return resolveFrom(name, invokerType, DirectMethodHandle.Holder.class);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Generate customized bytecode for a given LambdaForm.
|
|
*/
|
|
static MemberName generateCustomizedCode(LambdaForm form, MethodType invokerType) {
|
|
MemberName pregenerated = lookupPregenerated(form, invokerType);
|
|
if (pregenerated != null) return pregenerated; // pre-generated bytecode
|
|
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("MH", form, invokerType);
|
|
return g.loadMethod(g.generateCustomizedCodeBytes());
|
|
}
|
|
|
|
/** Generates code to check that actual receiver and LambdaForm matches */
|
|
private boolean checkActualReceiver(CodeBuilder cob) {
|
|
// Expects MethodHandle on the stack and actual receiver MethodHandle in slot #0
|
|
cob.dup()
|
|
.aload(0)
|
|
.invokestatic(CD_MethodHandleImpl, "assertSame", MethodTypeDescImpl.ofValidated(CD_void, CD_Object, CD_Object));
|
|
return true;
|
|
}
|
|
|
|
static final Annotation DONTINLINE = Annotation.of(ReferenceClassDescImpl.ofValidated("Ljdk/internal/vm/annotation/DontInline;"));
|
|
static final Annotation FORCEINLINE = Annotation.of(ReferenceClassDescImpl.ofValidated("Ljdk/internal/vm/annotation/ForceInline;"));
|
|
static final Annotation HIDDEN = Annotation.of(ReferenceClassDescImpl.ofValidated("Ljdk/internal/vm/annotation/Hidden;"));
|
|
static final Annotation INJECTEDPROFILE = Annotation.of(ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/InjectedProfile;"));
|
|
static final Annotation LF_COMPILED = Annotation.of(ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/LambdaForm$Compiled;"));
|
|
|
|
// Suppress method in backtraces displayed to the user, mark this method as
|
|
// a compiled LambdaForm, then either force or prohibit inlining.
|
|
public static final RuntimeVisibleAnnotationsAttribute LF_DONTINLINE_ANNOTATIONS = RuntimeVisibleAnnotationsAttribute.of(HIDDEN, LF_COMPILED, DONTINLINE);
|
|
public static final RuntimeVisibleAnnotationsAttribute LF_FORCEINLINE_ANNOTATIONS = RuntimeVisibleAnnotationsAttribute.of(HIDDEN, LF_COMPILED, FORCEINLINE);
|
|
|
|
/**
|
|
* Generate an invoker method for the passed {@link LambdaForm}.
|
|
*/
|
|
private byte[] generateCustomizedCodeBytes() {
|
|
final byte[] classFile = classFileSetup(new Consumer<>() {
|
|
@Override
|
|
public void accept(ClassBuilder clb) {
|
|
addMethod(clb, true);
|
|
clinit(clb, classEntry, classData);
|
|
bogusMethod(clb, lambdaForm);
|
|
}
|
|
});
|
|
return classFile;
|
|
}
|
|
|
|
void addMethod(ClassBuilder clb, boolean alive) {
|
|
methodSetup(clb, new Consumer<>() {
|
|
@Override
|
|
public void accept(MethodBuilder mb) {
|
|
|
|
if (lambdaForm.forceInline) {
|
|
mb.accept(LF_FORCEINLINE_ANNOTATIONS);
|
|
} else {
|
|
mb.accept(LF_DONTINLINE_ANNOTATIONS);
|
|
}
|
|
|
|
if (alive) {
|
|
classData(mb, lambdaForm, CD_LambdaForm); // keep LambdaForm instance & its compiled form lifetime tightly coupled.
|
|
}
|
|
|
|
mb.withCode(new Consumer<>() {
|
|
@Override
|
|
public void accept(CodeBuilder cob) {
|
|
if (lambdaForm.customized != null) {
|
|
// Since LambdaForm is customized for a particular MethodHandle, it's safe to substitute
|
|
// receiver MethodHandle (at slot #0) with an embedded constant and use it instead.
|
|
// It enables more efficient code generation in some situations, since embedded constants
|
|
// are compile-time constants for JIT compiler.
|
|
cob.getstatic(classData(cob, lambdaForm.customized, CD_MethodHandle));
|
|
assert(checkActualReceiver(cob)); // expects MethodHandle on top of the stack
|
|
cob.astore(0);
|
|
}
|
|
|
|
// iterate over the form's names, generating bytecode instructions for each
|
|
// start iterating at the first name following the arguments
|
|
Name onStack = null;
|
|
for (int i = lambdaForm.arity; i < lambdaForm.names.length; i++) {
|
|
Name name = lambdaForm.names[i];
|
|
|
|
emitStoreResult(cob, onStack);
|
|
onStack = name; // unless otherwise modified below
|
|
MethodHandleImpl.Intrinsic intr = name.function.intrinsicName();
|
|
switch (intr) {
|
|
case SELECT_ALTERNATIVE:
|
|
assert lambdaForm.isSelectAlternative(i);
|
|
if (PROFILE_GWT) {
|
|
assert(name.arguments[0] instanceof Name n &&
|
|
n.refersTo(MethodHandleImpl.class, "profileBoolean"));
|
|
mb.with(RuntimeVisibleAnnotationsAttribute.of(List.of(INJECTEDPROFILE)));
|
|
}
|
|
onStack = emitSelectAlternative(cob, name, lambdaForm.names[i+1]);
|
|
i++; // skip MH.invokeBasic of the selectAlternative result
|
|
continue;
|
|
case GUARD_WITH_CATCH:
|
|
assert lambdaForm.isGuardWithCatch(i);
|
|
onStack = emitGuardWithCatch(cob, i);
|
|
i += 2; // jump to the end of GWC idiom
|
|
continue;
|
|
case TRY_FINALLY:
|
|
assert lambdaForm.isTryFinally(i);
|
|
onStack = emitTryFinally(cob, i);
|
|
i += 2; // jump to the end of the TF idiom
|
|
continue;
|
|
case TABLE_SWITCH:
|
|
assert lambdaForm.isTableSwitch(i);
|
|
int numCases = (Integer) name.function.intrinsicData();
|
|
onStack = emitTableSwitch(cob, i, numCases);
|
|
i += 2; // jump to the end of the TS idiom
|
|
continue;
|
|
case LOOP:
|
|
assert lambdaForm.isLoop(i);
|
|
onStack = emitLoop(cob, i);
|
|
i += 2; // jump to the end of the LOOP idiom
|
|
continue;
|
|
case ARRAY_LOAD:
|
|
emitArrayLoad(cob, name);
|
|
continue;
|
|
case ARRAY_STORE:
|
|
emitArrayStore(cob, name);
|
|
continue;
|
|
case ARRAY_LENGTH:
|
|
emitArrayLength(cob, name);
|
|
continue;
|
|
case IDENTITY:
|
|
assert(name.arguments.length == 1);
|
|
emitPushArguments(cob, name, 0);
|
|
continue;
|
|
case ZERO:
|
|
assert(name.arguments.length == 0);
|
|
cob.loadConstant((ConstantDesc)name.type.basicTypeWrapper().zero());
|
|
continue;
|
|
case NONE:
|
|
// no intrinsic associated
|
|
break;
|
|
default:
|
|
throw newInternalError("Unknown intrinsic: "+intr);
|
|
}
|
|
|
|
MemberName member = name.function.member();
|
|
if (isStaticallyInvocable(member)) {
|
|
emitStaticInvoke(cob, member, name);
|
|
} else {
|
|
emitInvoke(cob, name);
|
|
}
|
|
}
|
|
|
|
// return statement
|
|
emitReturn(cob, onStack);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* The BytecodeGenerationException.
|
|
*/
|
|
@SuppressWarnings("serial")
|
|
static final class BytecodeGenerationException extends RuntimeException {
|
|
BytecodeGenerationException(Exception cause) {
|
|
super(cause);
|
|
}
|
|
}
|
|
|
|
void emitArrayLoad(CodeBuilder cob, Name name) {
|
|
Class<?> elementType = name.function.methodType().parameterType(0).getComponentType();
|
|
assert elementType != null;
|
|
emitPushArguments(cob, name, 0);
|
|
if (elementType.isPrimitive()) {
|
|
cob.arrayLoad(TypeKind.from(elementType));
|
|
} else {
|
|
cob.aaload();
|
|
}
|
|
}
|
|
|
|
void emitArrayStore(CodeBuilder cob, Name name) {
|
|
Class<?> elementType = name.function.methodType().parameterType(0).getComponentType();
|
|
assert elementType != null;
|
|
emitPushArguments(cob, name, 0);
|
|
if (elementType.isPrimitive()) {
|
|
cob.arrayStore(TypeKind.from(elementType));
|
|
} else {
|
|
cob.aastore();
|
|
}
|
|
}
|
|
|
|
void emitArrayLength(CodeBuilder cob, Name name) {
|
|
assert name.function.methodType().parameterType(0).isArray();
|
|
emitPushArguments(cob, name, 0);
|
|
cob.arraylength();
|
|
}
|
|
|
|
/**
|
|
* Emit an invoke for the given name.
|
|
*/
|
|
void emitInvoke(CodeBuilder cob, Name name) {
|
|
assert(!name.isLinkerMethodInvoke()); // should use the static path for these
|
|
if (true) {
|
|
// push receiver
|
|
MethodHandle target = name.function.resolvedHandle();
|
|
assert(target != null) : name.exprString();
|
|
cob.getstatic(classData(cob, target, CD_MethodHandle));
|
|
emitReferenceCast(cob, MethodHandle.class, target);
|
|
} else {
|
|
// load receiver
|
|
cob.aload(0);
|
|
emitReferenceCast(cob, MethodHandle.class, null);
|
|
cob.getfield(CD_MethodHandle, "form", CD_LambdaForm)
|
|
.getfield(CD_LambdaForm, "names", CD_LambdaForm_Name);
|
|
// TODO more to come
|
|
}
|
|
|
|
// push arguments
|
|
emitPushArguments(cob, name, 0);
|
|
|
|
// invocation
|
|
MethodType type = name.function.methodType();
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", methodDesc(type.basicType()));
|
|
}
|
|
|
|
private static final Class<?>[] STATICALLY_INVOCABLE_PACKAGES = {
|
|
// Sample classes from each package we are willing to bind to statically:
|
|
java.lang.Object.class,
|
|
java.util.Arrays.class,
|
|
jdk.internal.misc.Unsafe.class
|
|
//MethodHandle.class already covered
|
|
};
|
|
|
|
static boolean isStaticallyInvocable(NamedFunction ... functions) {
|
|
for (NamedFunction nf : functions) {
|
|
if (!isStaticallyInvocable(nf.member())) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static boolean isStaticallyInvocable(Name name) {
|
|
return isStaticallyInvocable(name.function.member());
|
|
}
|
|
|
|
static boolean isStaticallyInvocable(MemberName member) {
|
|
if (member == null) return false;
|
|
if (member.isConstructor()) return false;
|
|
Class<?> cls = member.getDeclaringClass();
|
|
// Fast-path non-private members declared by MethodHandles, which is a common
|
|
// case
|
|
if (MethodHandle.class.isAssignableFrom(cls) && !member.isPrivate()) {
|
|
assert(isStaticallyInvocableType(member.getMethodOrFieldType()));
|
|
return true;
|
|
}
|
|
if (cls.isArray() || cls.isPrimitive())
|
|
return false; // FIXME
|
|
if (cls.isAnonymousClass() || cls.isLocalClass())
|
|
return false; // inner class of some sort
|
|
if (cls.getClassLoader() != MethodHandle.class.getClassLoader())
|
|
return false; // not on BCP
|
|
if (cls.isHidden())
|
|
return false;
|
|
if (!isStaticallyInvocableType(member.getMethodOrFieldType()))
|
|
return false;
|
|
if (!member.isPrivate() && VerifyAccess.isSamePackage(MethodHandle.class, cls))
|
|
return true; // in java.lang.invoke package
|
|
if (member.isPublic() && isStaticallyNameable(cls))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
private static boolean isStaticallyInvocableType(MethodType mtype) {
|
|
if (!isStaticallyNameable(mtype.returnType()))
|
|
return false;
|
|
for (Class<?> ptype : mtype.ptypes())
|
|
if (!isStaticallyNameable(ptype))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static boolean isStaticallyNameable(Class<?> cls) {
|
|
if (cls == Object.class)
|
|
return true;
|
|
if (MethodHandle.class.isAssignableFrom(cls)) {
|
|
assert(!cls.isHidden());
|
|
return true;
|
|
}
|
|
while (cls.isArray())
|
|
cls = cls.getComponentType();
|
|
if (cls.isPrimitive())
|
|
return true; // int[].class, for example
|
|
if (cls.isHidden())
|
|
return false;
|
|
// could use VerifyAccess.isClassAccessible but the following is a safe approximation
|
|
if (cls.getClassLoader() != Object.class.getClassLoader())
|
|
return false;
|
|
if (VerifyAccess.isSamePackage(MethodHandle.class, cls))
|
|
return true;
|
|
if (!Modifier.isPublic(cls.getModifiers()))
|
|
return false;
|
|
for (Class<?> pkgcls : STATICALLY_INVOCABLE_PACKAGES) {
|
|
if (VerifyAccess.isSamePackage(pkgcls, cls))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void emitStaticInvoke(CodeBuilder cob, Name name) {
|
|
emitStaticInvoke(cob, name.function.member(), name);
|
|
}
|
|
|
|
/**
|
|
* Emit an invoke for the given name, using the MemberName directly.
|
|
*/
|
|
void emitStaticInvoke(CodeBuilder cob, MemberName member, Name name) {
|
|
assert(member.equals(name.function.member()));
|
|
Class<?> defc = member.getDeclaringClass();
|
|
ClassDesc cdesc = classDesc(defc);
|
|
String mname = member.getName();
|
|
byte refKind = member.getReferenceKind();
|
|
if (refKind == REF_invokeSpecial) {
|
|
// in order to pass the verifier, we need to convert this to invokevirtual in all cases
|
|
assert(member.canBeStaticallyBound()) : member;
|
|
refKind = REF_invokeVirtual;
|
|
}
|
|
|
|
assert(!(member.getDeclaringClass().isInterface() && refKind == REF_invokeVirtual));
|
|
|
|
// push arguments
|
|
emitPushArguments(cob, name, 0);
|
|
|
|
// invocation
|
|
if (member.isMethod()) {
|
|
var methodTypeDesc = methodDesc(member.getMethodType());
|
|
cob.invoke(refKindOpcode(refKind), cdesc, mname, methodTypeDesc,
|
|
member.getDeclaringClass().isInterface());
|
|
} else {
|
|
var fieldTypeDesc = classDesc(member.getFieldType());
|
|
cob.fieldAccess(refKindOpcode(refKind), cdesc, mname, fieldTypeDesc);
|
|
}
|
|
// Issue a type assertion for the result, so we can avoid casts later.
|
|
if (name.type == L_TYPE) {
|
|
Class<?> rtype = member.getInvocationType().returnType();
|
|
assert(!rtype.isPrimitive());
|
|
if (rtype != Object.class && !rtype.isInterface()) {
|
|
assertStaticType(rtype, name);
|
|
}
|
|
}
|
|
}
|
|
|
|
Opcode refKindOpcode(byte refKind) {
|
|
switch (refKind) {
|
|
case REF_invokeVirtual: return Opcode.INVOKEVIRTUAL;
|
|
case REF_invokeStatic: return Opcode.INVOKESTATIC;
|
|
case REF_invokeSpecial: return Opcode.INVOKESPECIAL;
|
|
case REF_invokeInterface: return Opcode.INVOKEINTERFACE;
|
|
case REF_getField: return Opcode.GETFIELD;
|
|
case REF_putField: return Opcode.PUTFIELD;
|
|
case REF_getStatic: return Opcode.GETSTATIC;
|
|
case REF_putStatic: return Opcode.PUTSTATIC;
|
|
}
|
|
throw new InternalError("refKind="+refKind);
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the selectAlternative idiom.
|
|
*
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeGuardWithTest):
|
|
* <blockquote><pre>{@code
|
|
* Lambda(a0:L,a1:I)=>{
|
|
* t2:I=foo.test(a1:I);
|
|
* t3:L=MethodHandleImpl.selectAlternative(t2:I,(MethodHandle(int)int),(MethodHandle(int)int));
|
|
* t4:I=MethodHandle.invokeBasic(t3:L,a1:I);t4:I}
|
|
* }</pre></blockquote>
|
|
*/
|
|
private Name emitSelectAlternative(CodeBuilder cob, Name selectAlternativeName, Name invokeBasicName) {
|
|
assert isStaticallyInvocable(invokeBasicName);
|
|
|
|
Name receiver = (Name) invokeBasicName.arguments[0];
|
|
|
|
Label L_fallback = cob.newLabel();
|
|
Label L_done = cob.newLabel();
|
|
|
|
// load test result
|
|
emitPushArgument(cob, selectAlternativeName, 0);
|
|
|
|
// if_icmpne L_fallback
|
|
cob.ifeq(L_fallback);
|
|
|
|
// invoke selectAlternativeName.arguments[1]
|
|
Class<?>[] preForkClasses = localClasses.clone();
|
|
emitPushArgument(cob, selectAlternativeName, 1); // get 2nd argument of selectAlternative
|
|
emitStoreInsn(cob, TypeKind.REFERENCE, receiver.index()); // store the MH in the receiver slot
|
|
emitStaticInvoke(cob, invokeBasicName);
|
|
|
|
// goto L_done
|
|
cob.goto_w(L_done)
|
|
// L_fallback:
|
|
.labelBinding(L_fallback);
|
|
|
|
// invoke selectAlternativeName.arguments[2]
|
|
System.arraycopy(preForkClasses, 0, localClasses, 0, preForkClasses.length);
|
|
emitPushArgument(cob, selectAlternativeName, 2); // get 3rd argument of selectAlternative
|
|
emitStoreInsn(cob, TypeKind.REFERENCE, receiver.index()); // store the MH in the receiver slot
|
|
emitStaticInvoke(cob, invokeBasicName);
|
|
|
|
// L_done:
|
|
cob.labelBinding(L_done);
|
|
// for now do not bother to merge typestate; just reset to the dominator state
|
|
System.arraycopy(preForkClasses, 0, localClasses, 0, preForkClasses.length);
|
|
|
|
return invokeBasicName; // return what's on stack
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the guardWithCatch idiom.
|
|
*
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeGuardWithCatch):
|
|
* <blockquote><pre>{@code
|
|
* guardWithCatch=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L,a5:L,a6:L,a7:L)=>{
|
|
* t8:L=MethodHandle.invokeBasic(a4:L,a6:L,a7:L);
|
|
* t9:L=MethodHandleImpl.guardWithCatch(a1:L,a2:L,a3:L,t8:L);
|
|
* t10:I=MethodHandle.invokeBasic(a5:L,t9:L);t10:I}
|
|
* }</pre></blockquote>
|
|
*
|
|
* It is compiled into bytecode equivalent of the following code:
|
|
* <blockquote><pre>{@code
|
|
* try {
|
|
* return a1.invokeBasic(a6, a7);
|
|
* } catch (Throwable e) {
|
|
* if (!a2.isInstance(e)) throw e;
|
|
* return a3.invokeBasic(ex, a6, a7);
|
|
* }}</pre></blockquote>
|
|
*/
|
|
private Name emitGuardWithCatch(CodeBuilder cob, int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
Label L_startBlock = cob.newLabel();
|
|
Label L_endBlock = cob.newLabel();
|
|
Label L_handler = cob.newLabel();
|
|
Label L_done = cob.newLabel();
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
MethodType type = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
|
|
cob.exceptionCatch(L_startBlock, L_endBlock, L_handler, CD_Throwable)
|
|
// Normal case
|
|
.labelBinding(L_startBlock);
|
|
// load target
|
|
emitPushArgument(cob, invoker, 0);
|
|
emitPushArguments(cob, args, 1); // skip 1st argument: method handle
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", methodDesc(type.basicType()))
|
|
.labelBinding(L_endBlock)
|
|
.goto_w(L_done)
|
|
// Exceptional case
|
|
.labelBinding(L_handler)
|
|
// Check exception's type
|
|
.dup();
|
|
// load exception class
|
|
emitPushArgument(cob, invoker, 1);
|
|
cob.swap()
|
|
.invokevirtual(CD_Class, "isInstance", MTD_boolean_Object);
|
|
Label L_rethrow = cob.newLabel();
|
|
cob.ifeq(L_rethrow);
|
|
|
|
// Invoke catcher
|
|
// load catcher
|
|
emitPushArgument(cob, invoker, 2);
|
|
cob.swap();
|
|
emitPushArguments(cob, args, 1); // skip 1st argument: method handle
|
|
MethodType catcherType = type.insertParameterTypes(0, Throwable.class);
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", methodDesc(catcherType.basicType()))
|
|
.goto_w(L_done)
|
|
.labelBinding(L_rethrow)
|
|
.athrow()
|
|
.labelBinding(L_done);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the tryFinally idiom.
|
|
* <p>
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeTryFinally):
|
|
* <blockquote><pre>{@code
|
|
* // a0: BMH
|
|
* // a1: target, a2: cleanup
|
|
* // a3: box, a4: unbox
|
|
* // a5 (and following): arguments
|
|
* tryFinally=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L,a5:L)=>{
|
|
* t6:L=MethodHandle.invokeBasic(a3:L,a5:L); // box the arguments into an Object[]
|
|
* t7:L=MethodHandleImpl.tryFinally(a1:L,a2:L,t6:L); // call the tryFinally executor
|
|
* t8:L=MethodHandle.invokeBasic(a4:L,t7:L);t8:L} // unbox the result; return the result
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* It is compiled into bytecode equivalent to the following code:
|
|
* <blockquote><pre>{@code
|
|
* Throwable t;
|
|
* Object r;
|
|
* try {
|
|
* r = a1.invokeBasic(a5);
|
|
* } catch (Throwable thrown) {
|
|
* t = thrown;
|
|
* throw t;
|
|
* } finally {
|
|
* r = a2.invokeBasic(t, r, a5);
|
|
* }
|
|
* return r;
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* Specifically, the bytecode will have the following form (the stack effects are given for the beginnings of
|
|
* blocks, and for the situations after executing the given instruction - the code will have a slightly different
|
|
* shape if the return type is {@code void}):
|
|
* <blockquote><pre>{@code
|
|
* TRY: (--)
|
|
* load target (-- target)
|
|
* load args (-- args... target)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (depends)
|
|
* FINALLY_NORMAL: (-- r_2nd* r)
|
|
* store returned value (--)
|
|
* load cleanup (-- cleanup)
|
|
* ACONST_NULL (-- t cleanup)
|
|
* load returned value (-- r_2nd* r t cleanup)
|
|
* load args (-- args... r_2nd* r t cleanup)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (-- r_2nd* r)
|
|
* GOTO DONE
|
|
* CATCH: (-- t)
|
|
* DUP (-- t t)
|
|
* FINALLY_EXCEPTIONAL: (-- t t)
|
|
* load cleanup (-- cleanup t t)
|
|
* SWAP (-- t cleanup t)
|
|
* load default for r (-- r_2nd* r t cleanup t)
|
|
* load args (-- args... r_2nd* r t cleanup t)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (-- r_2nd* r t)
|
|
* POP/POP2* (-- t)
|
|
* ATHROW
|
|
* DONE: (-- r)
|
|
* }</pre></blockquote>
|
|
* * = depends on whether the return type takes up 2 stack slots.
|
|
*/
|
|
private Name emitTryFinally(CodeBuilder cob, int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
Label lFrom = cob.newLabel();
|
|
Label lTo = cob.newLabel();
|
|
Label lCatch = cob.newLabel();
|
|
Label lDone = cob.newLabel();
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
BasicType basicReturnType = BasicType.basicType(returnType);
|
|
boolean isNonVoid = returnType != void.class;
|
|
|
|
MethodType type = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
MethodType cleanupType = type.insertParameterTypes(0, Throwable.class);
|
|
if (isNonVoid) {
|
|
cleanupType = cleanupType.insertParameterTypes(1, returnType);
|
|
}
|
|
MethodTypeDesc cleanupDesc = methodDesc(cleanupType.basicType());
|
|
|
|
// exception handler table
|
|
cob.exceptionCatch(lFrom, lTo, lCatch, CD_Throwable);
|
|
|
|
// TRY:
|
|
cob.labelBinding(lFrom);
|
|
emitPushArgument(cob, invoker, 0); // load target
|
|
emitPushArguments(cob, args, 1); // load args (skip 0: method handle)
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", methodDesc(type.basicType()))
|
|
.labelBinding(lTo);
|
|
|
|
// FINALLY_NORMAL:
|
|
int index = extendLocalsMap(new Class<?>[]{ returnType });
|
|
if (isNonVoid) {
|
|
emitStoreInsn(cob, basicReturnType.basicTypeKind(), index);
|
|
}
|
|
emitPushArgument(cob, invoker, 1); // load cleanup
|
|
cob.aconst_null();
|
|
if (isNonVoid) {
|
|
emitLoadInsn(cob, basicReturnType.basicTypeKind(), index);
|
|
}
|
|
emitPushArguments(cob, args, 1); // load args (skip 0: method handle)
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", cleanupDesc)
|
|
.goto_w(lDone)
|
|
// CATCH:
|
|
.labelBinding(lCatch)
|
|
.dup();
|
|
|
|
// FINALLY_EXCEPTIONAL:
|
|
emitPushArgument(cob, invoker, 1); // load cleanup
|
|
cob.swap();
|
|
if (isNonVoid) {
|
|
emitZero(cob, BasicType.basicType(returnType)); // load default for result
|
|
}
|
|
emitPushArguments(cob, args, 1); // load args (skip 0: method handle)
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", cleanupDesc);
|
|
if (isNonVoid) {
|
|
emitPopInsn(cob, basicReturnType);
|
|
}
|
|
cob.athrow()
|
|
// DONE:
|
|
.labelBinding(lDone);
|
|
|
|
return result;
|
|
}
|
|
|
|
private void emitPopInsn(CodeBuilder cob, BasicType type) {
|
|
switch (type) {
|
|
case I_TYPE, F_TYPE, L_TYPE -> cob.pop();
|
|
case J_TYPE, D_TYPE -> cob.pop2();
|
|
default -> throw new InternalError("unknown type: " + type);
|
|
}
|
|
}
|
|
|
|
private Name emitTableSwitch(CodeBuilder cob, int pos, int numCases) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos + 1];
|
|
Name result = lambdaForm.names[pos + 2];
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
MethodType caseType = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0, 1) // drop collector
|
|
.changeReturnType(returnType);
|
|
MethodTypeDesc caseDescriptor = methodDesc(caseType.basicType());
|
|
|
|
emitPushArgument(cob, invoker, 2); // push cases
|
|
cob.getfield(CD_CasesHolder, "cases", CD_MethodHandle_array);
|
|
int casesLocal = extendLocalsMap(new Class<?>[] { MethodHandle[].class });
|
|
emitStoreInsn(cob, TypeKind.REFERENCE, casesLocal);
|
|
|
|
Label endLabel = cob.newLabel();
|
|
Label defaultLabel = cob.newLabel();
|
|
List<SwitchCase> cases = new ArrayList<>(numCases);
|
|
for (int i = 0; i < numCases; i++) {
|
|
cases.add(SwitchCase.of(i, cob.newLabel()));
|
|
}
|
|
|
|
emitPushArgument(cob, invoker, 0); // push switch input
|
|
cob.tableswitch(0, numCases - 1, defaultLabel, cases)
|
|
.labelBinding(defaultLabel);
|
|
emitPushArgument(cob, invoker, 1); // push default handle
|
|
emitPushArguments(cob, args, 1); // again, skip collector
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", caseDescriptor)
|
|
.goto_(endLabel);
|
|
|
|
for (int i = 0; i < numCases; i++) {
|
|
cob.labelBinding(cases.get(i).target());
|
|
// Load the particular case:
|
|
emitLoadInsn(cob, TypeKind.REFERENCE, casesLocal);
|
|
cob.loadConstant(i)
|
|
.aaload();
|
|
|
|
// invoke it:
|
|
emitPushArguments(cob, args, 1); // again, skip collector
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", caseDescriptor)
|
|
.goto_(endLabel);
|
|
}
|
|
|
|
cob.labelBinding(endLabel);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the loop idiom.
|
|
* <p>
|
|
* The pattern looks like (Cf. MethodHandleImpl.loop):
|
|
* <blockquote><pre>{@code
|
|
* // a0: BMH
|
|
* // a1: LoopClauses (containing an array of arrays: inits, steps, preds, finis)
|
|
* // a2: box, a3: unbox
|
|
* // a4 (and following): arguments
|
|
* loop=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L)=>{
|
|
* t5:L=MethodHandle.invokeBasic(a2:L,a4:L); // box the arguments into an Object[]
|
|
* t6:L=MethodHandleImpl.loop(bt:L,a1:L,t5:L); // call the loop executor (with supplied types in bt)
|
|
* t7:L=MethodHandle.invokeBasic(a3:L,t6:L);t7:L} // unbox the result; return the result
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* It is compiled into bytecode equivalent to the code seen in {@link MethodHandleImpl#loop(BasicType[],
|
|
* MethodHandleImpl.LoopClauses, Object...)}, with the difference that no arrays
|
|
* will be used for local state storage. Instead, the local state will be mapped to actual stack slots.
|
|
* <p>
|
|
* Bytecode generation applies an unrolling scheme to enable better bytecode generation regarding local state type
|
|
* handling. The generated bytecode will have the following form ({@code void} types are ignored for convenience).
|
|
* Assume there are {@code C} clauses in the loop.
|
|
* <blockquote><pre>{@code
|
|
* PREINIT: ALOAD_1
|
|
* CHECKCAST LoopClauses
|
|
* GETFIELD LoopClauses.clauses
|
|
* ASTORE clauseDataIndex // place the clauses 2-dimensional array on the stack
|
|
* INIT: (INIT_SEQ for clause 1)
|
|
* ...
|
|
* (INIT_SEQ for clause C)
|
|
* LOOP: (LOOP_SEQ for clause 1)
|
|
* ...
|
|
* (LOOP_SEQ for clause C)
|
|
* GOTO LOOP
|
|
* DONE: ...
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* The {@code INIT_SEQ_x} sequence for clause {@code x} (with {@code x} ranging from {@code 0} to {@code C-1}) has
|
|
* the following shape. Assume slot {@code vx} is used to hold the state for clause {@code x}.
|
|
* <blockquote><pre>{@code
|
|
* INIT_SEQ_x: ALOAD clauseDataIndex
|
|
* ICONST_0
|
|
* AALOAD // load the inits array
|
|
* ICONST x
|
|
* AALOAD // load the init handle for clause x
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* store vx
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* The {@code LOOP_SEQ_x} sequence for clause {@code x} (with {@code x} ranging from {@code 0} to {@code C-1}) has
|
|
* the following shape. Again, assume slot {@code vx} is used to hold the state for clause {@code x}.
|
|
* <blockquote><pre>{@code
|
|
* LOOP_SEQ_x: ALOAD clauseDataIndex
|
|
* ICONST_1
|
|
* AALOAD // load the steps array
|
|
* ICONST x
|
|
* AALOAD // load the step handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* store vx
|
|
* ALOAD clauseDataIndex
|
|
* ICONST_2
|
|
* AALOAD // load the preds array
|
|
* ICONST x
|
|
* AALOAD // load the pred handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* IFNE LOOP_SEQ_x+1 // predicate returned false -> jump to next clause
|
|
* ALOAD clauseDataIndex
|
|
* ICONST_3
|
|
* AALOAD // load the finis array
|
|
* ICONST x
|
|
* AALOAD // load the fini handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* GOTO DONE // jump beyond end of clauses to return from loop
|
|
* }</pre></blockquote>
|
|
*/
|
|
private Name emitLoop(CodeBuilder cob, int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
// extract clause and loop-local state types
|
|
// find the type info in the loop invocation
|
|
BasicType[] loopClauseTypes = (BasicType[]) invoker.arguments[0];
|
|
Class<?>[] loopLocalStateTypes = Stream.of(loopClauseTypes)
|
|
.filter(bt -> bt != BasicType.V_TYPE)
|
|
.map(BasicType::basicTypeClass).toArray(Class<?>[]::new);
|
|
Class<?>[] localTypes = new Class<?>[loopLocalStateTypes.length + 1];
|
|
localTypes[0] = MethodHandleImpl.LoopClauses.class;
|
|
System.arraycopy(loopLocalStateTypes, 0, localTypes, 1, loopLocalStateTypes.length);
|
|
|
|
final int clauseDataIndex = extendLocalsMap(localTypes);
|
|
final int firstLoopStateIndex = clauseDataIndex + 1;
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
MethodType loopType = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
MethodType loopHandleType = loopType.insertParameterTypes(0, loopLocalStateTypes);
|
|
MethodType predType = loopHandleType.changeReturnType(boolean.class);
|
|
MethodType finiType = loopHandleType;
|
|
|
|
final int nClauses = loopClauseTypes.length;
|
|
|
|
// indices to invoker arguments to load method handle arrays
|
|
final int inits = 1;
|
|
final int steps = 2;
|
|
final int preds = 3;
|
|
final int finis = 4;
|
|
|
|
Label lLoop = cob.newLabel();
|
|
Label lDone = cob.newLabel();
|
|
Label lNext;
|
|
|
|
// PREINIT:
|
|
emitPushArgument(cob, MethodHandleImpl.LoopClauses.class, invoker.arguments[1]);
|
|
cob.getfield(CD_LoopClauses, "clauses", CD_MethodHandle_array2);
|
|
emitStoreInsn(cob, TypeKind.REFERENCE, clauseDataIndex);
|
|
|
|
// INIT:
|
|
for (int c = 0, state = 0; c < nClauses; ++c) {
|
|
MethodType cInitType = loopType.changeReturnType(loopClauseTypes[c].basicTypeClass());
|
|
emitLoopHandleInvoke(cob, invoker, inits, c, args, false, cInitType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
if (cInitType.returnType() != void.class) {
|
|
emitStoreInsn(cob, BasicType.basicType(cInitType.returnType()).basicTypeKind(), firstLoopStateIndex + state);
|
|
++state;
|
|
}
|
|
}
|
|
|
|
// LOOP:
|
|
cob.labelBinding(lLoop);
|
|
|
|
for (int c = 0, state = 0; c < nClauses; ++c) {
|
|
lNext = cob.newLabel();
|
|
|
|
MethodType stepType = loopHandleType.changeReturnType(loopClauseTypes[c].basicTypeClass());
|
|
boolean isVoid = stepType.returnType() == void.class;
|
|
|
|
// invoke loop step
|
|
emitLoopHandleInvoke(cob, invoker, steps, c, args, true, stepType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
if (!isVoid) {
|
|
emitStoreInsn(cob, BasicType.basicType(stepType.returnType()).basicTypeKind(), firstLoopStateIndex + state);
|
|
++state;
|
|
}
|
|
|
|
// invoke loop predicate
|
|
emitLoopHandleInvoke(cob, invoker, preds, c, args, true, predType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
cob.ifne(lNext);
|
|
|
|
// invoke fini
|
|
emitLoopHandleInvoke(cob, invoker, finis, c, args, true, finiType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
cob.goto_w(lDone)
|
|
// this is the beginning of the next loop clause
|
|
.labelBinding(lNext);
|
|
}
|
|
|
|
cob.goto_w(lLoop)
|
|
// DONE:
|
|
.labelBinding(lDone);
|
|
|
|
return result;
|
|
}
|
|
|
|
private int extendLocalsMap(Class<?>[] types) {
|
|
int firstSlot = localsMap.length - 1;
|
|
localsMap = Arrays.copyOf(localsMap, localsMap.length + types.length);
|
|
localClasses = Arrays.copyOf(localClasses, localClasses.length + types.length);
|
|
System.arraycopy(types, 0, localClasses, firstSlot, types.length);
|
|
int index = localsMap[firstSlot - 1] + 1;
|
|
int lastSlots = 0;
|
|
for (int i = 0; i < types.length; ++i) {
|
|
localsMap[firstSlot + i] = index;
|
|
lastSlots = BasicType.basicType(localClasses[firstSlot + i]).basicTypeSlots();
|
|
index += lastSlots;
|
|
}
|
|
localsMap[localsMap.length - 1] = index - lastSlots;
|
|
return firstSlot;
|
|
}
|
|
|
|
private void emitLoopHandleInvoke(CodeBuilder cob, Name holder, int handles, int clause, Name args, boolean pushLocalState,
|
|
MethodType type, Class<?>[] loopLocalStateTypes, int clauseDataSlot,
|
|
int firstLoopStateSlot) {
|
|
// load handle for clause
|
|
emitPushClauseArray(cob, clauseDataSlot, handles);
|
|
cob.loadConstant(clause)
|
|
.aaload();
|
|
// load loop state (preceding the other arguments)
|
|
if (pushLocalState) {
|
|
for (int s = 0; s < loopLocalStateTypes.length; ++s) {
|
|
emitLoadInsn(cob, BasicType.basicType(loopLocalStateTypes[s]).basicTypeKind(), firstLoopStateSlot + s);
|
|
}
|
|
}
|
|
// load loop args (skip 0: method handle)
|
|
emitPushArguments(cob, args, 1);
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", methodDesc(type));
|
|
}
|
|
|
|
private void emitPushClauseArray(CodeBuilder cob, int clauseDataSlot, int which) {
|
|
emitLoadInsn(cob, TypeKind.REFERENCE, clauseDataSlot);
|
|
cob.loadConstant(which - 1)
|
|
.aaload();
|
|
}
|
|
|
|
private void emitZero(CodeBuilder cob, BasicType type) {
|
|
switch (type) {
|
|
case I_TYPE -> cob.iconst_0();
|
|
case J_TYPE -> cob.lconst_0();
|
|
case F_TYPE -> cob.fconst_0();
|
|
case D_TYPE -> cob.dconst_0();
|
|
case L_TYPE -> cob.aconst_null();
|
|
default -> throw new InternalError("unknown type: " + type);
|
|
};
|
|
}
|
|
|
|
private void emitPushArguments(CodeBuilder cob, Name args, int start) {
|
|
MethodType type = args.function.methodType();
|
|
for (int i = start; i < args.arguments.length; i++) {
|
|
emitPushArgument(cob, type.parameterType(i), args.arguments[i]);
|
|
}
|
|
}
|
|
|
|
private void emitPushArgument(CodeBuilder cob, Name name, int paramIndex) {
|
|
Object arg = name.arguments[paramIndex];
|
|
Class<?> ptype = name.function.methodType().parameterType(paramIndex);
|
|
emitPushArgument(cob, ptype, arg);
|
|
}
|
|
|
|
private void emitPushArgument(CodeBuilder cob, Class<?> ptype, Object arg) {
|
|
BasicType bptype = basicType(ptype);
|
|
if (arg instanceof Name n) {
|
|
emitLoadInsn(cob, n.type.basicTypeKind(), n.index());
|
|
emitImplicitConversion(cob, n.type, ptype, n);
|
|
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
|
|
cob.loadConstant((ConstantDesc)arg);
|
|
} else {
|
|
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
|
|
cob.loadConstant((ConstantDesc)arg);
|
|
} else {
|
|
cob.getstatic(classData(cob, arg, CD_Object));
|
|
emitImplicitConversion(cob, L_TYPE, ptype, arg);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Store the name to its local, if necessary.
|
|
*/
|
|
private void emitStoreResult(CodeBuilder cob, Name name) {
|
|
if (name != null && name.type != V_TYPE) {
|
|
// non-void: actually assign
|
|
emitStoreInsn(cob, name.type.basicTypeKind(), name.index());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emits a return statement from a LF invoker. If required, the result type is cast to the correct return type.
|
|
*/
|
|
private void emitReturn(CodeBuilder cob, Name onStack) {
|
|
// return statement
|
|
Class<?> rclass = invokerType.returnType();
|
|
BasicType rtype = lambdaForm.returnType();
|
|
assert(rtype == basicType(rclass)); // must agree
|
|
if (rtype == V_TYPE) {
|
|
// void
|
|
cob.return_();
|
|
// it doesn't matter what rclass is; the JVM will discard any value
|
|
} else {
|
|
LambdaForm.Name rn = lambdaForm.names[lambdaForm.result];
|
|
|
|
// put return value on the stack if it is not already there
|
|
if (rn != onStack) {
|
|
emitLoadInsn(cob, rtype.basicTypeKind(), lambdaForm.result);
|
|
}
|
|
|
|
emitImplicitConversion(cob, rtype, rclass, rn);
|
|
|
|
// generate actual return statement
|
|
cob.return_(rtype.basicTypeKind());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emit a type conversion bytecode casting from "from" to "to".
|
|
*/
|
|
private void emitPrimCast(CodeBuilder cob, TypeKind from, TypeKind to) {
|
|
// Here's how.
|
|
// - indicates forbidden
|
|
// <-> indicates implicit
|
|
// to ----> boolean byte short char int long float double
|
|
// from boolean <-> - - - - - - -
|
|
// byte - <-> i2s i2c <-> i2l i2f i2d
|
|
// short - i2b <-> i2c <-> i2l i2f i2d
|
|
// char - i2b i2s <-> <-> i2l i2f i2d
|
|
// int - i2b i2s i2c <-> i2l i2f i2d
|
|
// long - l2i,i2b l2i,i2s l2i,i2c l2i <-> l2f l2d
|
|
// float - f2i,i2b f2i,i2s f2i,i2c f2i f2l <-> f2d
|
|
// double - d2i,i2b d2i,i2s d2i,i2c d2i d2l d2f <->
|
|
if (from != to && from != TypeKind.BOOLEAN) try {
|
|
cob.conversion(from, to);
|
|
} catch (IllegalArgumentException e) {
|
|
throw new IllegalStateException("unhandled prim cast: " + from + "2" + to);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generate bytecode for a LambdaForm.vmentry which calls interpretWithArguments.
|
|
*/
|
|
static MemberName generateLambdaFormInterpreterEntryPoint(MethodType mt) {
|
|
assert(isValidSignature(basicTypeSignature(mt)));
|
|
String name = "interpret_"+basicTypeChar(mt.returnType());
|
|
MethodType type = mt; // includes leading argument
|
|
type = type.changeParameterType(0, MethodHandle.class);
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("LFI", name, type);
|
|
return g.loadMethod(g.generateLambdaFormInterpreterEntryPointBytes());
|
|
}
|
|
|
|
private byte[] generateLambdaFormInterpreterEntryPointBytes() {
|
|
final byte[] classFile = classFileSetup(new Consumer<>() {
|
|
@Override
|
|
public void accept(ClassBuilder clb) {
|
|
methodSetup(clb, new Consumer<>() {
|
|
@Override
|
|
public void accept(MethodBuilder mb) {
|
|
|
|
mb.with(RuntimeVisibleAnnotationsAttribute.of(List.of(
|
|
HIDDEN, // Suppress this method in backtraces displayed to the user.
|
|
DONTINLINE // Don't inline the interpreter entry.
|
|
)));
|
|
|
|
mb.withCode(new Consumer<>() {
|
|
@Override
|
|
public void accept(CodeBuilder cob) {
|
|
// create parameter array
|
|
cob.loadConstant(invokerType.parameterCount())
|
|
.anewarray(CD_Object);
|
|
|
|
// fill parameter array
|
|
for (int i = 0; i < invokerType.parameterCount(); i++) {
|
|
Class<?> ptype = invokerType.parameterType(i);
|
|
cob.dup()
|
|
.loadConstant(i);
|
|
emitLoadInsn(cob, basicType(ptype).basicTypeKind(), i);
|
|
// box if primitive type
|
|
if (ptype.isPrimitive()) {
|
|
emitBoxing(cob, TypeKind.from(ptype));
|
|
}
|
|
cob.aastore();
|
|
}
|
|
// invoke
|
|
cob.aload(0)
|
|
.getfield(CD_MethodHandle, "form", CD_LambdaForm)
|
|
.swap() // swap form and array; avoid local variable
|
|
.invokevirtual(CD_LambdaForm, "interpretWithArguments", MethodTypeDescImpl.ofValidated(CD_Object, CD_Object_array));
|
|
|
|
// maybe unbox
|
|
Class<?> rtype = invokerType.returnType();
|
|
TypeKind rtypeK = TypeKind.from(rtype);
|
|
if (rtype.isPrimitive() && rtype != void.class) {
|
|
emitUnboxing(cob, rtypeK);
|
|
}
|
|
|
|
// return statement
|
|
cob.return_(rtypeK);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
clinit(clb, classEntry, classData);
|
|
bogusMethod(clb, invokerType);
|
|
}
|
|
});
|
|
return classFile;
|
|
}
|
|
|
|
/**
|
|
* Generate bytecode for a NamedFunction invoker.
|
|
*/
|
|
static MemberName generateNamedFunctionInvoker(MethodTypeForm typeForm) {
|
|
MethodType invokerType = NamedFunction.INVOKER_METHOD_TYPE;
|
|
String invokerName = "invoke_" + shortenSignature(basicTypeSignature(typeForm.erasedType()));
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("NFI", invokerName, invokerType);
|
|
return g.loadMethod(g.generateNamedFunctionInvokerImpl(typeForm));
|
|
}
|
|
|
|
private byte[] generateNamedFunctionInvokerImpl(MethodTypeForm typeForm) {
|
|
MethodType dstType = typeForm.erasedType();
|
|
final byte[] classFile = classFileSetup(new Consumer<>() {
|
|
@Override
|
|
public void accept(ClassBuilder clb) {
|
|
methodSetup(clb, new Consumer<>() {
|
|
@Override
|
|
public void accept(MethodBuilder mb) {
|
|
|
|
mb.with(RuntimeVisibleAnnotationsAttribute.of(List.of(
|
|
HIDDEN, // Suppress this method in backtraces displayed to the user.
|
|
FORCEINLINE // Force inlining of this invoker method.
|
|
)));
|
|
|
|
mb.withCode(new Consumer<>() {
|
|
@Override
|
|
public void accept(CodeBuilder cob) {
|
|
// Load receiver
|
|
cob.aload(0);
|
|
|
|
// Load arguments from array
|
|
for (int i = 0; i < dstType.parameterCount(); i++) {
|
|
cob.aload(1)
|
|
.loadConstant(i)
|
|
.aaload();
|
|
|
|
// Maybe unbox
|
|
Class<?> dptype = dstType.parameterType(i);
|
|
if (dptype.isPrimitive()) {
|
|
TypeKind dstTK = TypeKind.from(dptype);
|
|
TypeKind srcTK = dstTK.asLoadable();
|
|
emitUnboxing(cob, srcTK);
|
|
emitPrimCast(cob, srcTK, dstTK);
|
|
}
|
|
}
|
|
|
|
// Invoke
|
|
MethodTypeDesc targetDesc = methodDesc(dstType.basicType());
|
|
cob.invokevirtual(CD_MethodHandle, "invokeBasic", targetDesc);
|
|
|
|
// Box primitive types
|
|
Class<?> rtype = dstType.returnType();
|
|
if (rtype != void.class && rtype.isPrimitive()) {
|
|
TypeKind srcTK = TypeKind.from(rtype);
|
|
TypeKind dstTK = srcTK.asLoadable();
|
|
// boolean casts not allowed
|
|
emitPrimCast(cob, srcTK, dstTK);
|
|
emitBoxing(cob, dstTK);
|
|
}
|
|
|
|
// If the return type is void we return a null reference.
|
|
if (rtype == void.class) {
|
|
cob.aconst_null();
|
|
}
|
|
cob.areturn(); // NOTE: NamedFunction invokers always return a reference value.
|
|
}
|
|
});
|
|
}
|
|
});
|
|
clinit(clb, classEntry, classData);
|
|
bogusMethod(clb, dstType);
|
|
}
|
|
});
|
|
return classFile;
|
|
}
|
|
|
|
/**
|
|
* Emit a bogus method that just loads some string constants. This is to get the constants into the constant pool
|
|
* for debugging purposes.
|
|
*/
|
|
private void bogusMethod(ClassBuilder clb, Object os) {
|
|
if (dumper().isEnabled()) {
|
|
clb.withMethodBody("dummy", MTD_void, ACC_STATIC, new Consumer<>() {
|
|
@Override
|
|
public void accept(CodeBuilder cob) {
|
|
cob.ldc(os.toString())
|
|
.pop()
|
|
.return_();
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
static ClassDesc classDesc(Class<?> cls) {
|
|
// assert(VerifyAccess.isTypeVisible(cls, Object.class)) : cls.getName();
|
|
return cls == MethodHandle.class ? CD_MethodHandle
|
|
: cls == DirectMethodHandle.class ? CD_DirectMethodHandle
|
|
: cls == Object.class ? CD_Object
|
|
: cls == MemberName.class ? CD_MemberName
|
|
: cls == MethodType.class ? CD_MethodType
|
|
: cls.isPrimitive() ? Wrapper.forPrimitiveType(cls).basicClassDescriptor()
|
|
: ReferenceClassDescImpl.ofValidated(cls.descriptorString());
|
|
}
|
|
|
|
static MethodTypeDesc methodDesc(MethodType mt) {
|
|
var params = new ClassDesc[mt.parameterCount()];
|
|
for (int i = 0; i < params.length; i++) {
|
|
params[i] = classDesc(mt.parameterType(i));
|
|
}
|
|
return MethodTypeDescImpl.ofValidated(classDesc(mt.returnType()), params);
|
|
}
|
|
}
|