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⏎ java/lang/invoke/InnerClassLambdaMetafactory.java
/*
* Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
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*
*/
package java.lang.invoke;
import jdk.internal.misc.CDS;
import jdk.internal.org.objectweb.asm.*;
import sun.invoke.util.BytecodeDescriptor;
import sun.invoke.util.VerifyAccess;
import sun.security.action.GetPropertyAction;
import sun.security.action.GetBooleanAction;
import java.io.FilePermission;
import java.io.Serializable;
import java.lang.constant.ConstantDescs;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.LinkedHashSet;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.PropertyPermission;
import java.util.Set;
import static java.lang.invoke.MethodHandles.Lookup.ClassOption.NESTMATE;
import static java.lang.invoke.MethodHandles.Lookup.ClassOption.STRONG;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
/**
* Lambda metafactory implementation which dynamically creates an
* inner-class-like class per lambda callsite.
*
* @see LambdaMetafactory
*/
/* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory {
private static final int CLASSFILE_VERSION = 59;
private static final String METHOD_DESCRIPTOR_VOID = Type.getMethodDescriptor(Type.VOID_TYPE);
private static final String JAVA_LANG_OBJECT = "java/lang/Object";
private static final String NAME_CTOR = "<init>";
private static final String LAMBDA_INSTANCE_FIELD = "LAMBDA_INSTANCE$";
//Serialization support
private static final String NAME_SERIALIZED_LAMBDA = "java/lang/invoke/SerializedLambda";
private static final String NAME_NOT_SERIALIZABLE_EXCEPTION = "java/io/NotSerializableException";
private static final String DESCR_METHOD_WRITE_REPLACE = "()Ljava/lang/Object;";
private static final String DESCR_METHOD_WRITE_OBJECT = "(Ljava/io/ObjectOutputStream;)V";
private static final String DESCR_METHOD_READ_OBJECT = "(Ljava/io/ObjectInputStream;)V";
private static final String NAME_METHOD_WRITE_REPLACE = "writeReplace";
private static final String NAME_METHOD_READ_OBJECT = "readObject";
private static final String NAME_METHOD_WRITE_OBJECT = "writeObject";
private static final String DESCR_CLASS = "Ljava/lang/Class;";
private static final String DESCR_STRING = "Ljava/lang/String;";
private static final String DESCR_OBJECT = "Ljava/lang/Object;";
private static final String DESCR_CTOR_SERIALIZED_LAMBDA
= "(" + DESCR_CLASS + DESCR_STRING + DESCR_STRING + DESCR_STRING + "I"
+ DESCR_STRING + DESCR_STRING + DESCR_STRING + DESCR_STRING + "[" + DESCR_OBJECT + ")V";
private static final String DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION = "(Ljava/lang/String;)V";
private static final String[] SER_HOSTILE_EXCEPTIONS = new String[] {NAME_NOT_SERIALIZABLE_EXCEPTION};
private static final String[] EMPTY_STRING_ARRAY = new String[0];
// Used to ensure that each spun class name is unique
private static final AtomicInteger counter = new AtomicInteger();
// For dumping generated classes to disk, for debugging purposes
private static final ProxyClassesDumper dumper;
private static final boolean disableEagerInitialization;
// condy to load implMethod from class data
private static final ConstantDynamic implMethodCondy;
static {
final String dumpProxyClassesKey = "jdk.internal.lambda.dumpProxyClasses";
String dumpPath = GetPropertyAction.privilegedGetProperty(dumpProxyClassesKey);
dumper = (null == dumpPath) ? null : ProxyClassesDumper.getInstance(dumpPath);
final String disableEagerInitializationKey = "jdk.internal.lambda.disableEagerInitialization";
disableEagerInitialization = GetBooleanAction.privilegedGetProperty(disableEagerInitializationKey);
// condy to load implMethod from class data
MethodType classDataMType = MethodType.methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class);
Handle classDataBsm = new Handle(H_INVOKESTATIC, Type.getInternalName(MethodHandles.class), "classData",
classDataMType.descriptorString(), false);
implMethodCondy = new ConstantDynamic(ConstantDescs.DEFAULT_NAME, MethodHandle.class.descriptorString(), classDataBsm);
}
// See context values in AbstractValidatingLambdaMetafactory
private final String implMethodClassName; // Name of type containing implementation "CC"
private final String implMethodName; // Name of implementation method "impl"
private final String implMethodDesc; // Type descriptor for implementation methods "(I)Ljava/lang/String;"
private final MethodType constructorType; // Generated class constructor type "(CC)void"
private final ClassWriter cw; // ASM class writer
private final String[] argNames; // Generated names for the constructor arguments
private final String[] argDescs; // Type descriptors for the constructor arguments
private final String lambdaClassName; // Generated name for the generated class "X$$Lambda$1"
private final boolean useImplMethodHandle; // use MethodHandle invocation instead of symbolic bytecode invocation
/**
* General meta-factory constructor, supporting both standard cases and
* allowing for uncommon options such as serialization or bridging.
*
* @param caller Stacked automatically by VM; represents a lookup context
* with the accessibility privileges of the caller.
* @param factoryType Stacked automatically by VM; the signature of the
* invoked method, which includes the expected static
* type of the returned lambda object, and the static
* types of the captured arguments for the lambda. In
* the event that the implementation method is an
* instance method, the first argument in the invocation
* signature will correspond to the receiver.
* @param interfaceMethodName Name of the method in the functional interface to
* which the lambda or method reference is being
* converted, represented as a String.
* @param interfaceMethodType Type of the method in the functional interface to
* which the lambda or method reference is being
* converted, represented as a MethodType.
* @param implementation The implementation method which should be called (with
* suitable adaptation of argument types, return types,
* and adjustment for captured arguments) when methods of
* the resulting functional interface instance are invoked.
* @param dynamicMethodType The signature of the primary functional
* interface method after type variables are
* substituted with their instantiation from
* the capture site
* @param isSerializable Should the lambda be made serializable? If set,
* either the target type or one of the additional SAM
* types must extend {@code Serializable}.
* @param altInterfaces Additional interfaces which the lambda object
* should implement.
* @param altMethods Method types for additional signatures to be
* implemented by invoking the implementation method
* @throws LambdaConversionException If any of the meta-factory protocol
* invariants are violated
* @throws SecurityException If a security manager is present, and it
* <a href="MethodHandles.Lookup.html#secmgr">denies access</a>
* from {@code caller} to the package of {@code implementation}.
*/
public InnerClassLambdaMetafactory(MethodHandles.Lookup caller,
MethodType factoryType,
String interfaceMethodName,
MethodType interfaceMethodType,
MethodHandle implementation,
MethodType dynamicMethodType,
boolean isSerializable,
Class<?>[] altInterfaces,
MethodType[] altMethods)
throws LambdaConversionException {
super(caller, factoryType, interfaceMethodName, interfaceMethodType,
implementation, dynamicMethodType,
isSerializable, altInterfaces, altMethods);
implMethodClassName = implClass.getName().replace('.', '/');
implMethodName = implInfo.getName();
implMethodDesc = implInfo.getMethodType().toMethodDescriptorString();
constructorType = factoryType.changeReturnType(Void.TYPE);
lambdaClassName = lambdaClassName(targetClass);
// If the target class invokes a protected method inherited from a
// superclass in a different package, or does 'invokespecial', the
// lambda class has no access to the resolved method. Instead, we need
// to pass the live implementation method handle to the proxy class
// to invoke directly. (javac prefers to avoid this situation by
// generating bridges in the target class)
useImplMethodHandle = (Modifier.isProtected(implInfo.getModifiers()) &&
!VerifyAccess.isSamePackage(targetClass, implInfo.getDeclaringClass())) ||
implKind == H_INVOKESPECIAL;
cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
int parameterCount = factoryType.parameterCount();
if (parameterCount > 0) {
argNames = new String[parameterCount];
argDescs = new String[parameterCount];
for (int i = 0; i < parameterCount; i++) {
argNames[i] = "arg$" + (i + 1);
argDescs[i] = BytecodeDescriptor.unparse(factoryType.parameterType(i));
}
} else {
argNames = argDescs = EMPTY_STRING_ARRAY;
}
}
private static String lambdaClassName(Class<?> targetClass) {
String name = targetClass.getName();
if (targetClass.isHidden()) {
// use the original class name
name = name.replace('/', '_');
}
return name.replace('.', '/') + "$$Lambda$" + counter.incrementAndGet();
}
/**
* Build the CallSite. Generate a class file which implements the functional
* interface, define the class, if there are no parameters create an instance
* of the class which the CallSite will return, otherwise, generate handles
* which will call the class' constructor.
*
* @return a CallSite, which, when invoked, will return an instance of the
* functional interface
* @throws LambdaConversionException If properly formed functional interface
* is not found
*/
@Override
CallSite buildCallSite() throws LambdaConversionException {
final Class<?> innerClass = spinInnerClass();
if (factoryType.parameterCount() == 0) {
// In the case of a non-capturing lambda, we optimize linkage by pre-computing a single instance,
// unless we've suppressed eager initialization
if (disableEagerInitialization) {
try {
return new ConstantCallSite(caller.findStaticGetter(innerClass, LAMBDA_INSTANCE_FIELD,
factoryType.returnType()));
} catch (ReflectiveOperationException e) {
throw new LambdaConversionException(
"Exception finding " + LAMBDA_INSTANCE_FIELD + " static field", e);
}
} else {
@SuppressWarnings("removal")
final Constructor<?>[] ctrs = AccessController.doPrivileged(
new PrivilegedAction<>() {
@Override
public Constructor<?>[] run() {
Constructor<?>[] ctrs = innerClass.getDeclaredConstructors();
if (ctrs.length == 1) {
// The lambda implementing inner class constructor is private, set
// it accessible (by us) before creating the constant sole instance
ctrs[0].setAccessible(true);
}
return ctrs;
}
});
if (ctrs.length != 1) {
throw new LambdaConversionException("Expected one lambda constructor for "
+ innerClass.getCanonicalName() + ", got " + ctrs.length);
}
try {
Object inst = ctrs[0].newInstance();
return new ConstantCallSite(MethodHandles.constant(interfaceClass, inst));
} catch (ReflectiveOperationException e) {
throw new LambdaConversionException("Exception instantiating lambda object", e);
}
}
} else {
try {
MethodHandle mh = caller.findConstructor(innerClass, constructorType);
return new ConstantCallSite(mh.asType(factoryType));
} catch (ReflectiveOperationException e) {
throw new LambdaConversionException("Exception finding constructor", e);
}
}
}
/**
* Spins the lambda proxy class.
*
* This first checks if a lambda proxy class can be loaded from CDS archive.
* Otherwise, generate the lambda proxy class. If CDS dumping is enabled, it
* registers the lambda proxy class for including into the CDS archive.
*/
private Class<?> spinInnerClass() throws LambdaConversionException {
// CDS does not handle disableEagerInitialization or useImplMethodHandle
if (!disableEagerInitialization && !useImplMethodHandle) {
// include lambda proxy class in CDS archive at dump time
if (CDS.isDumpingArchive()) {
Class<?> innerClass = generateInnerClass();
LambdaProxyClassArchive.register(targetClass,
interfaceMethodName,
factoryType,
interfaceMethodType,
implementation,
dynamicMethodType,
isSerializable,
altInterfaces,
altMethods,
innerClass);
return innerClass;
}
// load from CDS archive if present
Class<?> innerClass = LambdaProxyClassArchive.find(targetClass,
interfaceMethodName,
factoryType,
interfaceMethodType,
implementation,
dynamicMethodType,
isSerializable,
altInterfaces,
altMethods);
if (innerClass != null) return innerClass;
}
return generateInnerClass();
}
/**
* Generate a class file which implements the functional
* interface, define and return the class.
*
* @return a Class which implements the functional interface
* @throws LambdaConversionException If properly formed functional interface
* is not found
*/
@SuppressWarnings("removal")
private Class<?> generateInnerClass() throws LambdaConversionException {
String[] interfaceNames;
String interfaceName = interfaceClass.getName().replace('.', '/');
boolean accidentallySerializable = !isSerializable && Serializable.class.isAssignableFrom(interfaceClass);
if (altInterfaces.length == 0) {
interfaceNames = new String[]{interfaceName};
} else {
// Assure no duplicate interfaces (ClassFormatError)
Set<String> itfs = new LinkedHashSet<>(altInterfaces.length + 1);
itfs.add(interfaceName);
for (Class<?> i : altInterfaces) {
itfs.add(i.getName().replace('.', '/'));
accidentallySerializable |= !isSerializable && Serializable.class.isAssignableFrom(i);
}
interfaceNames = itfs.toArray(new String[itfs.size()]);
}
cw.visit(CLASSFILE_VERSION, ACC_SUPER + ACC_FINAL + ACC_SYNTHETIC,
lambdaClassName, null,
JAVA_LANG_OBJECT, interfaceNames);
// Generate final fields to be filled in by constructor
for (int i = 0; i < argDescs.length; i++) {
FieldVisitor fv = cw.visitField(ACC_PRIVATE + ACC_FINAL,
argNames[i],
argDescs[i],
null, null);
fv.visitEnd();
}
generateConstructor();
if (factoryType.parameterCount() == 0 && disableEagerInitialization) {
generateClassInitializer();
}
// Forward the SAM method
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, interfaceMethodName,
interfaceMethodType.toMethodDescriptorString(), null, null);
new ForwardingMethodGenerator(mv).generate(interfaceMethodType);
// Forward the altMethods
if (altMethods != null) {
for (MethodType mt : altMethods) {
mv = cw.visitMethod(ACC_PUBLIC, interfaceMethodName,
mt.toMethodDescriptorString(), null, null);
new ForwardingMethodGenerator(mv).generate(mt);
}
}
if (isSerializable)
generateSerializationFriendlyMethods();
else if (accidentallySerializable)
generateSerializationHostileMethods();
cw.visitEnd();
// Define the generated class in this VM.
final byte[] classBytes = cw.toByteArray();
// If requested, dump out to a file for debugging purposes
if (dumper != null) {
AccessController.doPrivileged(new PrivilegedAction<>() {
@Override
public Void run() {
dumper.dumpClass(lambdaClassName, classBytes);
return null;
}
}, null,
new FilePermission("<<ALL FILES>>", "read, write"),
// createDirectories may need it
new PropertyPermission("user.dir", "read"));
}
try {
// this class is linked at the indy callsite; so define a hidden nestmate
Lookup lookup;
if (useImplMethodHandle) {
lookup = caller.defineHiddenClassWithClassData(classBytes, implementation, !disableEagerInitialization,
NESTMATE, STRONG);
} else {
lookup = caller.defineHiddenClass(classBytes, !disableEagerInitialization, NESTMATE, STRONG);
}
return lookup.lookupClass();
} catch (IllegalAccessException e) {
throw new LambdaConversionException("Exception defining lambda proxy class", e);
} catch (Throwable t) {
throw new InternalError(t);
}
}
/**
* Generate a static field and a static initializer that sets this field to an instance of the lambda
*/
private void generateClassInitializer() {
String lambdaTypeDescriptor = factoryType.returnType().descriptorString();
// Generate the static final field that holds the lambda singleton
FieldVisitor fv = cw.visitField(ACC_PRIVATE | ACC_STATIC | ACC_FINAL,
LAMBDA_INSTANCE_FIELD, lambdaTypeDescriptor, null, null);
fv.visitEnd();
// Instantiate the lambda and store it to the static final field
MethodVisitor clinit = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
clinit.visitCode();
clinit.visitTypeInsn(NEW, lambdaClassName);
clinit.visitInsn(Opcodes.DUP);
assert factoryType.parameterCount() == 0;
clinit.visitMethodInsn(INVOKESPECIAL, lambdaClassName, NAME_CTOR, constructorType.toMethodDescriptorString(), false);
clinit.visitFieldInsn(PUTSTATIC, lambdaClassName, LAMBDA_INSTANCE_FIELD, lambdaTypeDescriptor);
clinit.visitInsn(RETURN);
clinit.visitMaxs(-1, -1);
clinit.visitEnd();
}
/**
* Generate the constructor for the class
*/
private void generateConstructor() {
// Generate constructor
MethodVisitor ctor = cw.visitMethod(ACC_PRIVATE, NAME_CTOR,
constructorType.toMethodDescriptorString(), null, null);
ctor.visitCode();
ctor.visitVarInsn(ALOAD, 0);
ctor.visitMethodInsn(INVOKESPECIAL, JAVA_LANG_OBJECT, NAME_CTOR,
METHOD_DESCRIPTOR_VOID, false);
int parameterCount = factoryType.parameterCount();
for (int i = 0, lvIndex = 0; i < parameterCount; i++) {
ctor.visitVarInsn(ALOAD, 0);
Class<?> argType = factoryType.parameterType(i);
ctor.visitVarInsn(getLoadOpcode(argType), lvIndex + 1);
lvIndex += getParameterSize(argType);
ctor.visitFieldInsn(PUTFIELD, lambdaClassName, argNames[i], argDescs[i]);
}
ctor.visitInsn(RETURN);
// Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored
ctor.visitMaxs(-1, -1);
ctor.visitEnd();
}
/**
* Generate a writeReplace method that supports serialization
*/
private void generateSerializationFriendlyMethods() {
TypeConvertingMethodAdapter mv
= new TypeConvertingMethodAdapter(
cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
NAME_METHOD_WRITE_REPLACE, DESCR_METHOD_WRITE_REPLACE,
null, null));
mv.visitCode();
mv.visitTypeInsn(NEW, NAME_SERIALIZED_LAMBDA);
mv.visitInsn(DUP);
mv.visitLdcInsn(Type.getType(targetClass));
mv.visitLdcInsn(factoryType.returnType().getName().replace('.', '/'));
mv.visitLdcInsn(interfaceMethodName);
mv.visitLdcInsn(interfaceMethodType.toMethodDescriptorString());
mv.visitLdcInsn(implInfo.getReferenceKind());
mv.visitLdcInsn(implInfo.getDeclaringClass().getName().replace('.', '/'));
mv.visitLdcInsn(implInfo.getName());
mv.visitLdcInsn(implInfo.getMethodType().toMethodDescriptorString());
mv.visitLdcInsn(dynamicMethodType.toMethodDescriptorString());
mv.iconst(argDescs.length);
mv.visitTypeInsn(ANEWARRAY, JAVA_LANG_OBJECT);
for (int i = 0; i < argDescs.length; i++) {
mv.visitInsn(DUP);
mv.iconst(i);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]);
mv.boxIfTypePrimitive(Type.getType(argDescs[i]));
mv.visitInsn(AASTORE);
}
mv.visitMethodInsn(INVOKESPECIAL, NAME_SERIALIZED_LAMBDA, NAME_CTOR,
DESCR_CTOR_SERIALIZED_LAMBDA, false);
mv.visitInsn(ARETURN);
// Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored
mv.visitMaxs(-1, -1);
mv.visitEnd();
}
/**
* Generate a readObject/writeObject method that is hostile to serialization
*/
private void generateSerializationHostileMethods() {
MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
NAME_METHOD_WRITE_OBJECT, DESCR_METHOD_WRITE_OBJECT,
null, SER_HOSTILE_EXCEPTIONS);
mv.visitCode();
mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION);
mv.visitInsn(DUP);
mv.visitLdcInsn("Non-serializable lambda");
mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR,
DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false);
mv.visitInsn(ATHROW);
mv.visitMaxs(-1, -1);
mv.visitEnd();
mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
NAME_METHOD_READ_OBJECT, DESCR_METHOD_READ_OBJECT,
null, SER_HOSTILE_EXCEPTIONS);
mv.visitCode();
mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION);
mv.visitInsn(DUP);
mv.visitLdcInsn("Non-serializable lambda");
mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR,
DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false);
mv.visitInsn(ATHROW);
mv.visitMaxs(-1, -1);
mv.visitEnd();
}
/**
* This class generates a method body which calls the lambda implementation
* method, converting arguments, as needed.
*/
private class ForwardingMethodGenerator extends TypeConvertingMethodAdapter {
ForwardingMethodGenerator(MethodVisitor mv) {
super(mv);
}
void generate(MethodType methodType) {
visitCode();
if (implKind == MethodHandleInfo.REF_newInvokeSpecial) {
visitTypeInsn(NEW, implMethodClassName);
visitInsn(DUP);
}
if (useImplMethodHandle) {
visitLdcInsn(implMethodCondy);
}
for (int i = 0; i < argNames.length; i++) {
visitVarInsn(ALOAD, 0);
visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]);
}
convertArgumentTypes(methodType);
if (useImplMethodHandle) {
MethodType mtype = implInfo.getMethodType();
if (implKind != MethodHandleInfo.REF_invokeStatic) {
mtype = mtype.insertParameterTypes(0, implClass);
}
visitMethodInsn(INVOKEVIRTUAL, "java/lang/invoke/MethodHandle",
"invokeExact", mtype.descriptorString(), false);
} else {
// Invoke the method we want to forward to
visitMethodInsn(invocationOpcode(), implMethodClassName,
implMethodName, implMethodDesc,
implClass.isInterface());
}
// Convert the return value (if any) and return it
// Note: if adapting from non-void to void, the 'return'
// instruction will pop the unneeded result
Class<?> implReturnClass = implMethodType.returnType();
Class<?> samReturnClass = methodType.returnType();
convertType(implReturnClass, samReturnClass, samReturnClass);
visitInsn(getReturnOpcode(samReturnClass));
// Maxs computed by ClassWriter.COMPUTE_MAXS,these arguments ignored
visitMaxs(-1, -1);
visitEnd();
}
private void convertArgumentTypes(MethodType samType) {
int lvIndex = 0;
int samParametersLength = samType.parameterCount();
int captureArity = factoryType.parameterCount();
for (int i = 0; i < samParametersLength; i++) {
Class<?> argType = samType.parameterType(i);
visitVarInsn(getLoadOpcode(argType), lvIndex + 1);
lvIndex += getParameterSize(argType);
convertType(argType, implMethodType.parameterType(captureArity + i), dynamicMethodType.parameterType(i));
}
}
private int invocationOpcode() throws InternalError {
return switch (implKind) {
case MethodHandleInfo.REF_invokeStatic -> INVOKESTATIC;
case MethodHandleInfo.REF_newInvokeSpecial -> INVOKESPECIAL;
case MethodHandleInfo.REF_invokeVirtual -> INVOKEVIRTUAL;
case MethodHandleInfo.REF_invokeInterface -> INVOKEINTERFACE;
case MethodHandleInfo.REF_invokeSpecial -> INVOKESPECIAL;
default -> throw new InternalError("Unexpected invocation kind: " + implKind);
};
}
}
static int getParameterSize(Class<?> c) {
if (c == Void.TYPE) {
return 0;
} else if (c == Long.TYPE || c == Double.TYPE) {
return 2;
}
return 1;
}
static int getLoadOpcode(Class<?> c) {
if(c == Void.TYPE) {
throw new InternalError("Unexpected void type of load opcode");
}
return ILOAD + getOpcodeOffset(c);
}
static int getReturnOpcode(Class<?> c) {
if(c == Void.TYPE) {
return RETURN;
}
return IRETURN + getOpcodeOffset(c);
}
private static int getOpcodeOffset(Class<?> c) {
if (c.isPrimitive()) {
if (c == Long.TYPE) {
return 1;
} else if (c == Float.TYPE) {
return 2;
} else if (c == Double.TYPE) {
return 3;
}
return 0;
} else {
return 4;
}
}
}
⏎ java/lang/invoke/InnerClassLambdaMetafactory.java
Or download all of them as a single archive file:
File name: java.base-17.0.5-src.zip File size: 8883851 bytes Release date: 2022-09-13 Download
2023-09-26, 44465👍, 1💬
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