org.apache.yoko.rmi.util.stub.BCELClassBuilder Maven / Gradle / Ivy
/**
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.yoko.rmi.util.stub;
import java.util.Collection;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.bcel.Constants;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Synthetic;
import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ARETURN;
import org.apache.bcel.generic.ASTORE;
import org.apache.bcel.generic.ATHROW;
import org.apache.bcel.generic.ArrayType;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.DLOAD;
import org.apache.bcel.generic.DRETURN;
import org.apache.bcel.generic.FLOAD;
import org.apache.bcel.generic.FRETURN;
import org.apache.bcel.generic.FieldGen;
import org.apache.bcel.generic.ILOAD;
import org.apache.bcel.generic.INVOKESPECIAL;
import org.apache.bcel.generic.IRETURN;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionConstants;
import org.apache.bcel.generic.InstructionFactory;
import org.apache.bcel.generic.InstructionHandle;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.LLOAD;
import org.apache.bcel.generic.LRETURN;
import org.apache.bcel.generic.MethodGen;
import org.apache.bcel.generic.NEW;
import org.apache.bcel.generic.ObjectType;
import org.apache.bcel.generic.PUSH;
import org.apache.bcel.generic.PUTFIELD;
import org.apache.bcel.generic.Type;
class BCELClassBuilder {
static final Logger logger = Logger.getLogger(BCELClassBuilder.class
.getName());
static Class make(ClassLoader loader, Class superClass, Class[] interfaces,
MethodRef[] methods, MethodRef[] superMethodRefs, Object[] data,
MethodRef handlerMethodRef, String className,
StubInitializer initializer)
throws IllegalAccessException, InstantiationException,
IllegalArgumentException {
String superClassName = superClass.getName();
String[] interfaceNames = new String[interfaces.length + 1];
for (int i = 0; i < interfaces.length; i++)
interfaceNames[i] = interfaces[i].getName();
interfaceNames[interfaces.length] = Stub.class.getName();
ClassGen newStubClass = new ClassGen(className, superClassName,
"generated", // file name
Constants.ACC_PUBLIC | Constants.ACC_FINAL, interfaceNames);
ConstantPoolGen cp = newStubClass.getConstantPool();
if (handlerMethodRef == null)
throw new IllegalArgumentException("handler method is null");
//
// Check that the handler method is valid
//
Class[] paramTypes = handlerMethodRef.getParameterTypes();
if (paramTypes.length != 3) {
throw new IllegalArgumentException(
"handler method must have three arguments");
}
if (!paramTypes[0].isAssignableFrom(superClass)) {
throw new IllegalArgumentException(
"Handler's 1st argument must be super-type for "
+ superClass);
}
// the type of data fields
Type typeOfDataFields = translate(paramTypes[1]);
if (Object[].class != paramTypes[2]) {
throw new IllegalArgumentException(
"Handler's 3rd argument must be Object[]");
}
//
// Construct field for the handler reference
//
Class handlerClass = handlerMethodRef.getDeclaringClass();
FieldGen handlerFieldGen = new FieldGen(Constants.ACC_PRIVATE
| Constants.ACC_FINAL, translate(handlerClass), Util
.handlerFieldName(), cp);
newStubClass.addField(handlerFieldGen.getField());
//
// Construct the method that gets the stub handler.
//
generateHandlerGetter(newStubClass, handlerFieldGen);
//
// construct the field that holds the initializer
//
FieldGen initializerFieldGen = new FieldGen(Constants.ACC_PRIVATE
| Constants.ACC_STATIC, translate(StubInitializer.class), Util
.initializerFieldName(), cp);
newStubClass.addField(initializerFieldGen.getField());
//
// Emit constructor
//
emitInitializerConstructor(newStubClass, handlerFieldGen,
initializerFieldGen);
//
// Construct data fields
//
FieldGen[] dataFieldGens = new FieldGen[methods.length];
for (int i = 0; i < methods.length; i++) {
MethodRef method = methods[i];
dataFieldGens[i] = new FieldGen(Constants.ACC_PRIVATE
| Constants.ACC_STATIC, typeOfDataFields, Util
.methodFieldName(i), cp);
newStubClass.addField(dataFieldGens[i].getField());
}
//
// Construct method stubs
//
for (int i = 0; i < methods.length; i++) {
generate(newStubClass, methods[i], dataFieldGens[i],
handlerFieldGen, handlerMethodRef);
}
//
// Construct super-method trampolines
//
for (int i = 0; i < superMethodRefs.length; i++) {
generateSuperMethod(newStubClass, superMethodRefs[i]);
}
JavaClass javaClass = newStubClass.getJavaClass();
byte[] classData = javaClass.getBytes();
try {
if (Boolean.getBoolean("org.apache.yoko.rmi.util.stub.debug")) {
java.io.File out = new java.io.File(className + ".class");
// System.out.println ("dumping to file "+out);
javaClass.dump(out);
}
} catch (java.io.IOException ex) {
logger.log(Level.WARNING, "", ex);
}
Class proxyClass = Util.defineClass(loader, className, classData, 0,
classData.length);
// initialize the static data fields
for (int i = 0; i < methods.length; i++) {
try {
java.lang.reflect.Field f = proxyClass
.getDeclaredField(dataFieldGens[i].getName());
f.setAccessible(true);
f.set(null, data[i]);
f.setAccessible(false);
} catch (NoSuchFieldException ex) {
logger
.log(
Level.WARNING,
"cannot find field "
+ dataFieldGens[i].getName()
+ " for stub class "
+ className
+ " extends: "
+ superClassName
+ "implements: "
+ interfaceNames[0]
+ (interfaceNames.length > 2 ? " (among others) "
: ""), ex);
throw new Error("internal error!", ex);
}
}
// set the initializer
try {
java.lang.reflect.Field f = proxyClass.getDeclaredField(Util
.initializerFieldName());
f.setAccessible(true);
f.set(null, initializer);
} catch (NoSuchFieldException ex) {
throw new Error("internal error!", ex);
}
return proxyClass;
}
static Class make(ClassLoader loader, Class superClass, Class[] interfaces,
MethodRef[] methods, Object[] data, MethodRef handlerMethodRef,
String className)
throws IllegalAccessException, InstantiationException,
IllegalArgumentException {
// construct the name of the new class
String superClassName = superClass.getName();
String[] interfaceNames = new String[interfaces.length + 1];
for (int i = 0; i < interfaces.length; i++)
interfaceNames[i] = interfaces[i].getName();
interfaceNames[interfaces.length] = Stub.class.getName();
ClassGen newStubClass = new ClassGen(className, superClassName,
"generated", // file name
Constants.ACC_PUBLIC | Constants.ACC_FINAL, interfaceNames);
ConstantPoolGen cp = newStubClass.getConstantPool();
if (handlerMethodRef == null)
throw new IllegalArgumentException("handler method is null");
//
// Check that the handler method is valid
//
Class[] paramTypes = handlerMethodRef.getParameterTypes();
if (paramTypes.length != 3) {
throw new IllegalArgumentException(
"handler method must have three arguments");
}
if (!paramTypes[0].isAssignableFrom(superClass)) {
throw new IllegalArgumentException(
"Handler's 1st argument must be super-type for "
+ superClass);
}
// the type of data fields
Type typeOfDataFields = translate(paramTypes[1]);
if (Object[].class != paramTypes[2]) {
throw new IllegalArgumentException(
"Handler's 3rd argument must be Object[]");
}
//
// Construct field for the handler reference
//
Class handlerClass = handlerMethodRef.getDeclaringClass();
FieldGen handlerFieldGen = new FieldGen(Constants.ACC_PRIVATE
| Constants.ACC_FINAL, translate(handlerClass), Util
.handlerFieldName(), cp);
newStubClass.addField(handlerFieldGen.getField());
//
// Construct the method that gets the stub handler.
//
generateHandlerGetter(newStubClass, handlerFieldGen);
//
// Emit constructor
//
emitOneArgConstructor(newStubClass, handlerFieldGen);
//
// Construct data fields
//
FieldGen[] dataFieldGens = new FieldGen[methods.length];
for (int i = 0; i < methods.length; i++) {
MethodRef method = methods[i];
dataFieldGens[i] = new FieldGen(Constants.ACC_PRIVATE
| Constants.ACC_STATIC, typeOfDataFields, Util
.methodFieldName(i), cp);
newStubClass.addField(dataFieldGens[i].getField());
}
//
// Construct method stubs
//
for (int i = 0; i < methods.length; i++) {
generate(newStubClass, methods[i], dataFieldGens[i],
handlerFieldGen, handlerMethodRef);
}
JavaClass javaClass = newStubClass.getJavaClass();
byte[] classData = javaClass.getBytes();
try {
if (Boolean.getBoolean("org.apache.yoko.rmi.util.stub.debug")) {
java.io.File out = new java.io.File(className + ".class");
// System.out.println ("dumping to file "+out);
javaClass.dump(out);
}
} catch (java.io.IOException ex) {
logger.log(Level.WARNING, "", ex);
}
Class proxyClass = Util.defineClass(loader, className, classData, 0,
classData.length);
// initialize the static data fields
for (int i = 0; i < methods.length; i++) {
try {
java.lang.reflect.Field f = proxyClass
.getDeclaredField(dataFieldGens[i].getName());
f.setAccessible(true);
f.set(null, data[i]);
f.setAccessible(false);
} catch (NoSuchFieldException ex) {
throw new Error("internal error!", ex);
}
}
return proxyClass;
}
static Type translate(Class clazz) {
if (clazz.isPrimitive()) {
if (clazz == Integer.TYPE) {
return Type.INT;
} else if (clazz == Boolean.TYPE) {
return Type.BOOLEAN;
} else if (clazz == Short.TYPE) {
return Type.SHORT;
} else if (clazz == Byte.TYPE) {
return Type.BYTE;
} else if (clazz == Long.TYPE) {
return Type.LONG;
} else if (clazz == Double.TYPE) {
return Type.DOUBLE;
} else if (clazz == Float.TYPE) {
return Type.FLOAT;
} else if (clazz == Character.TYPE) {
return Type.CHAR;
} else if (clazz == Void.TYPE) {
return Type.VOID;
} else {
throw new InternalError();
}
} else if (clazz.isArray()) {
return new ArrayType(translate(clazz.getComponentType()), 1);
} else {
return new ObjectType(clazz.getName());
}
}
static Type[] translate(Class[] clazz) {
Type[] result = new Type[clazz.length];
for (int i = 0; i < clazz.length; i++) {
result[i] = translate(clazz[i]);
}
return result;
}
public static MethodRef[] getAbstractMethods(Class base, Class[] interfaces) {
if (base == null)
base = Object.class;
MethodRef[] methods = collectMethods(base, interfaces);
return methods;
}
/**
* Collect the set of method objects that are would be abstract in a
* subclass of super_class, implementing
* interfaces.
*/
public static MethodRef[] collectMethods(Class super_class,
Class[] interfaces) {
HashMap methods = new HashMap();
if (interfaces != null) {
for (int i = 0; i < interfaces.length; i++)
collectAbstractMethods(methods, interfaces[i]);
}
collectAbstractMethods(methods, super_class);
removeImplementedMethods(methods, super_class);
Collection c = methods.values();
return (MethodRef[]) c.toArray(new MethodRef[c.size()]);
}
/**
* Collect all methods to be generated. We'll only collect each method once;
* so multiple redeclations will be eliminetd.
*/
private static void collectAbstractMethods(HashMap methods, Class type) {
if (type == java.lang.Object.class || type == null)
return;
Class[] if_types = type.getInterfaces();
for (int i = 0; i < if_types.length; i++) {
collectAbstractMethods(methods, if_types[i]);
}
collectAbstractMethods(methods, type.getSuperclass());
boolean type_is_interface = type.isInterface();
java.lang.reflect.Method[] declared = type.getDeclaredMethods();
for (int i = 0; i < declared.length; i++) {
MethodRef m = new MethodRef(declared[i]);
if (type_is_interface
|| java.lang.reflect.Modifier.isAbstract(m.getModifiers())) {
String key = m.getName() + m.getSignature();
if (!methods.containsKey(key)) {
methods.put(key, m);
}
}
}
}
/**
* This is used in the second phase of collect, to remove methods that have
* been collected in collectAbstractMethods.
*/
private static void removeImplementedMethods(HashMap methods, Class type) {
if (type == java.lang.Object.class || type == null)
return;
removeImplementedMethods(methods, type.getSuperclass());
java.lang.reflect.Method[] declared = type.getDeclaredMethods();
for (int i = 0; i < declared.length; i++) {
MethodRef m = new MethodRef(declared[i]);
if (!java.lang.reflect.Modifier.isAbstract(m.getModifiers())) {
String key = m.getName() + m.getSignature();
methods.remove(key);
}
}
}
static String className(String packageName, Class superClass,
Class[] interfaces) {
String className;
String fullName;
if (packageName == null) {
if (!java.lang.reflect.Modifier.isPublic(superClass.getModifiers())) {
packageName = Util.getPackageName(superClass);
} else {
for (int i = 0; i < interfaces.length; i++) {
if (java.lang.reflect.Modifier.isProtected(interfaces[i]
.getModifiers())) {
packageName = Util.getPackageName(interfaces[i]);
}
}
}
if (packageName == null) {
packageName = "org.apache.yoko.rmi.util.stub.gen";
}
}
synchronized (BCELClassBuilder.class) {
className = "Stub$$" + counter++;
}
return packageName + "." + className;
}
static int counter = 0;
static Type stubHandlerType = translate(StubHandler.class);
static Type initializerType = translate(StubInitializer.class);
static MethodRef getStubHandlerRef;
static {
try {
getStubHandlerRef = new MethodRef(StubInitializer.class
.getDeclaredMethod("getStubHandler", new Class[0]));
} catch (NoSuchMethodException ex) {
throw new Error(ex.getMessage(), ex);
}
}
//
// Constructor for a stub with an initializer
//
static void emitInitializerConstructor(ClassGen stubClass,
FieldGen handlerField, FieldGen initializerField) {
String stubClassName = stubClass.getClassName();
ConstantPoolGen cp = stubClass.getConstantPool();
InstructionList il = new InstructionList();
MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID,
Type.NO_ARGS, null, "", stubClassName, il, cp);
InstructionFactory fac = new InstructionFactory(stubClass, cp);
// call super-constructor
il.append(InstructionFactory.createThis());
il.append(fac.createInvoke(stubClass.getSuperclassName(), "",
Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
// push "this"
il.append(InstructionFactory.createThis());
// get static initializer
il.append(fac.createGetStatic(stubClassName,
initializerField.getName(), initializerField.getType()));
emitInvoke(il, fac, getStubHandlerRef);
// checkCast
il.append(fac.createCast(Type.OBJECT, handlerField.getType()));
// put handlerField
il.append(new PUTFIELD(cp.addFieldref(stubClassName, handlerField
.getName(), handlerField.getSignature())));
// return
il.append(InstructionConstants.RETURN);
// compute stack and locals...
mg.setMaxStack();
mg.setMaxLocals();
stubClass.addMethod(mg.getMethod());
}
//
// Constructor for a stub with an initializer
//
static void emitOneArgConstructor(ClassGen stubClass, FieldGen handlerField) {
String stubClassName = stubClass.getClassName();
ConstantPoolGen cp = stubClass.getConstantPool();
InstructionList il = new InstructionList();
Type[] args = new Type[] { handlerField.getType() };
MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID, args,
null, "", stubClassName, il, cp);
InstructionFactory fac = new InstructionFactory(stubClass, cp);
// call super-constructor
il.append(InstructionFactory.createThis());
il.append(fac.createInvoke(stubClass.getSuperclassName(), "",
Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
// push this again...
il.append(InstructionFactory.createThis());
// push the handler
il.append(InstructionFactory.createLoad(handlerField.getType(), 1));
// put handlerField
il.append(new PUTFIELD(cp.addFieldref(stubClassName, handlerField
.getName(), handlerField.getSignature())));
// return
il.append(InstructionConstants.RETURN);
// compute stack and locals...
mg.setMaxStack();
mg.setMaxLocals();
stubClass.addMethod(mg.getMethod());
}
static void generateHandlerGetter(ClassGen clazz, FieldGen handlerField) {
java.lang.reflect.Method[] stub_methods = Stub.class
.getDeclaredMethods();
if (stub_methods.length != 1) {
throw new IllegalStateException("" + Stub.class
+ " has wrong # methods");
}
String handlerGetName = stub_methods[0].getName();
ConstantPoolGen cp = clazz.getConstantPool();
InstructionList il = new InstructionList();
InstructionFactory fac = new InstructionFactory(clazz, cp);
Type methodReturnType = translate(Object.class);
Type[] methodArgTypes = new Type[0];
MethodGen mg = new MethodGen(
Constants.ACC_FINAL | Constants.ACC_PUBLIC, methodReturnType,
methodArgTypes, null, // arg names
handlerGetName, clazz.getClassName(), il, cp);
mg.addAttribute(new Synthetic(cp.addUtf8("Synthetic"), 0, null, cp
.getConstantPool()));
//
// construct method body
//
il.append(InstructionFactory.createThis());
il.append(fac.createGetField(clazz.getClassName(), handlerField
.getName(), handlerField.getType()));
emitReturn(il, methodReturnType);
//
// finish up...
//
mg.setMaxStack();
mg.setMaxLocals();
clazz.addMethod(mg.getMethod());
}
static void generate(ClassGen clazz, MethodRef method, FieldGen dataField,
FieldGen handlerField, MethodRef handlerMethodRef) {
ConstantPoolGen cp;
InstructionList il;
cp = clazz.getConstantPool();
il = new InstructionList();
InstructionFactory fac = new InstructionFactory(clazz, cp);
Type methodReturnType = translate(method.getReturnType());
Type[] methodArgTypes = translate(method.getParameterTypes());
MethodGen mg = new MethodGen(
Constants.ACC_FINAL | Constants.ACC_PUBLIC, methodReturnType,
methodArgTypes, null, // arg names
method.getName(), clazz.getClassName(), il, cp);
mg.addAttribute(new Synthetic(cp.addUtf8("Synthetic"), 0, null, cp
.getConstantPool()));
Class[] throwsException = method.getExceptionTypes();
for (int i = 0; i < throwsException.length; i++) {
mg.addException(throwsException[i].getName());
}
//
// BODY
//
il.append(InstructionFactory.createThis());
il.append(fac.createGetField(clazz.getClassName(), handlerField
.getName(), handlerField.getType()));
// push "this" as invoke's first argument
il.append(InstructionFactory.createThis());
// load data value
if (dataField.isStatic()) {
il.append(fac.createGetStatic(clazz.getClassName(), dataField
.getName(), dataField.getType()));
} else {
il.append(InstructionFactory.createThis());
il.append(fac.createGetField(clazz.getClassName(), dataField
.getName(), dataField.getType()));
}
il.append(new PUSH(cp, methodArgTypes.length));
il.append((Instruction) fac.createNewArray(Type.OBJECT, (short) 1));
int index = 1;
for (int i = 0; i < methodArgTypes.length; i++) {
// dup array ref
il.append(InstructionConstants.DUP);
// push index
il.append(new PUSH(cp, i));
// transform parameter
il.append(InstructionFactory.createLoad(methodArgTypes[i], index));
emitCoerceToObject(il, fac, methodArgTypes[i]);
// and store into array
il.append(InstructionFactory.createArrayStore(Type.OBJECT));
index += methodArgTypes[i].getSize();
}
//
// invoke handler's method
//
InstructionHandle tryStart = emitInvoke(il, fac, handlerMethodRef);
// convert to primitive type
emitCoerceFromObject(il, fac, methodReturnType);
// and return
InstructionHandle tryEnd = emitReturn(il, methodReturnType);
//
// catch...
//
InstructionHandle rethrowLocation = il.append(new ATHROW());
Class[] exceptions = method.getExceptionTypes();
boolean handle_throwable_exception = true;
boolean handle_runtime_exception = true;
if (exceptions != null) {
for (int i = 0; i < exceptions.length; i++) {
Class ex = exceptions[i];
if (ex == java.lang.Throwable.class)
handle_throwable_exception = false;
if (ex == java.lang.RuntimeException.class
|| ex == java.lang.Exception.class)
handle_runtime_exception = false;
mg.addExceptionHandler(tryStart, tryEnd, rethrowLocation,
(ObjectType) translate(ex));
}
}
// A RuntimeException should not cause an
// UndeclaredThrowableException, so we catch and re-throw it
// that before throwable.
if (handle_throwable_exception && handle_runtime_exception) {
mg.addExceptionHandler(tryStart, tryEnd, rethrowLocation,
new ObjectType("java.lang.RuntimeException"));
}
// If anything else is thrown, it is wrapped in an
// UndeclaredThrowable
if (handle_throwable_exception) {
InstructionHandle handlerStart = il.append(new ASTORE(1));
il
.append(new NEW(
cp
.addClass("java.lang.reflect.UndeclaredThrowableException")));
il.append(InstructionConstants.DUP);
il.append(new ALOAD(1));
il.append(new INVOKESPECIAL(cp.addMethodref(
"java.lang.reflect.UndeclaredThrowableException", "",
"(Ljava/lang/Throwable;)V")));
il.append(new ATHROW());
mg.addExceptionHandler(tryStart, tryEnd, handlerStart,
new ObjectType("java.lang.Throwable"));
}
//
// DONE
//
mg.setMaxStack();
mg.setMaxLocals();
clazz.addMethod(mg.getMethod());
}
static void generateSuperMethod(ClassGen clazz, MethodRef method) {
ConstantPoolGen cp;
InstructionList il;
cp = clazz.getConstantPool();
il = new InstructionList();
InstructionFactory fac = new InstructionFactory(clazz, cp);
Type methodReturnType = translate(method.getReturnType());
Type[] methodArgTypes = translate(method.getParameterTypes());
MethodGen mg = new MethodGen(
Constants.ACC_FINAL | Constants.ACC_PUBLIC, methodReturnType,
methodArgTypes, null, // arg names
method.getName(), clazz.getClassName(), il, cp);
mg.addAttribute(new Synthetic(cp.addUtf8("Synthetic"), 0, null, cp
.getConstantPool()));
Class[] throwsException = method.getExceptionTypes();
for (int i = 0; i < throwsException.length; i++) {
mg.addException(throwsException[i].getName());
}
// push this
il.append(InstructionFactory.createThis());
// push arguments
int index = 1;
for (int i = 0; i < methodArgTypes.length; i++) {
emitLoad(il, index, methodArgTypes[i]);
index += methodArgTypes[i].getSize();
}
// call method
il.append(new INVOKESPECIAL(cp.addMethodref(method.getDeclaringClass()
.getName(), method.getName(), method.getSignature())));
emitReturn(il, methodReturnType);
//
// DONE
//
mg.setMaxStack();
mg.setMaxLocals();
clazz.addMethod(mg.getMethod());
}
static InstructionHandle emitLoad(InstructionList il, int index, Type type) {
switch (type.getType()) {
case Constants.T_BOOLEAN:
case Constants.T_CHAR:
case Constants.T_BYTE:
case Constants.T_SHORT:
case Constants.T_INT:
return il.append(new ILOAD(index));
case Constants.T_LONG:
return il.append(new LLOAD(index));
case Constants.T_FLOAT:
return il.append(new FLOAD(index));
case Constants.T_DOUBLE:
return il.append(new DLOAD(index));
default:
return il.append(new ALOAD(index));
}
}
static InstructionHandle emitReturn(InstructionList il, Type type) {
switch (type.getType()) {
case Constants.T_BOOLEAN:
case Constants.T_CHAR:
case Constants.T_BYTE:
case Constants.T_SHORT:
case Constants.T_INT:
return il.append(new IRETURN());
case Constants.T_LONG:
return il.append(new LRETURN());
case Constants.T_FLOAT:
return il.append(new FRETURN());
case Constants.T_DOUBLE:
return il.append(new DRETURN());
case Constants.T_VOID:
return il.append(InstructionConstants.RETURN);
default:
return il.append(new ARETURN());
}
}
static void emitCoerceToObject(InstructionList il, InstructionFactory fac,
Type type) {
int tag = type.getType();
switch (tag) {
case Constants.T_BOOLEAN:
case Constants.T_CHAR:
case Constants.T_BYTE:
case Constants.T_SHORT:
case Constants.T_INT:
case Constants.T_FLOAT:
// float
il.append(fac.createNew(new ObjectType(BASIC_CLASS_NAMES[tag])));
// float Float
il.append(InstructionConstants.DUP_X1);
// Float float Float
il.append(InstructionConstants.SWAP);
// Float Float float
il.append(fac.createInvoke(BASIC_CLASS_NAMES[tag], "",
Type.VOID, new Type[] { type }, Constants.INVOKESPECIAL));
// Float
return;
case Constants.T_DOUBLE:
case Constants.T_LONG:
// double/2
il.append(fac.createNew(new ObjectType(BASIC_CLASS_NAMES[tag])));
// double/2 Double
il.append(InstructionConstants.DUP_X2);
// Double double/2 Double
il.append(InstructionConstants.DUP_X2);
// Double Double double/2 Double
il.append(InstructionConstants.POP);
// Double Double double/2
il.append(fac.createInvoke(BASIC_CLASS_NAMES[tag], "",
Type.VOID, new Type[] { type }, Constants.INVOKESPECIAL));
// Double
return;
case Constants.T_VOID:
il.append(InstructionConstants.ACONST_NULL);
default:
return;
}
}
public static final String[] BASIC_CLASS_NAMES = { null, null, null, null,
"java.lang.Boolean", "java.lang.Character", "java.lang.Float",
"java.lang.Double", "java.lang.Byte", "java.lang.Short",
"java.lang.Integer", "java.lang.Long", "java.lang.Void", null,
null, null, null };
static MethodRef[] UNBOXING_METHOD = new MethodRef[Constants.T_VOID];
static {
try {
UNBOXING_METHOD[Constants.T_BOOLEAN] = new MethodRef(
java.lang.Boolean.class.getDeclaredMethod("booleanValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_CHAR] = new MethodRef(
java.lang.Character.class.getDeclaredMethod("charValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_BYTE] = new MethodRef(
java.lang.Byte.class.getDeclaredMethod("byteValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_SHORT] = new MethodRef(
java.lang.Short.class.getDeclaredMethod("shortValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_INT] = new MethodRef(
java.lang.Integer.class.getDeclaredMethod("intValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_LONG] = new MethodRef(
java.lang.Long.class.getDeclaredMethod("longValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_FLOAT] = new MethodRef(
java.lang.Float.class.getDeclaredMethod("floatValue",
new Class[0]));
UNBOXING_METHOD[Constants.T_DOUBLE] = new MethodRef(
java.lang.Double.class.getDeclaredMethod("doubleValue",
new Class[0]));
} catch (NoSuchMethodException ex) {
throw new Error(ex);
}
}
static InstructionHandle emitCoerceFromObject(InstructionList il,
InstructionFactory fac, Type type) {
int tag = type.getType();
switch (tag) {
case Constants.T_BOOLEAN:
case Constants.T_CHAR:
case Constants.T_BYTE:
case Constants.T_SHORT:
case Constants.T_INT:
case Constants.T_LONG:
case Constants.T_FLOAT:
case Constants.T_DOUBLE:
il.append(fac.createCast(Type.OBJECT, new ObjectType(
BASIC_CLASS_NAMES[tag])));
return emitInvoke(il, fac, UNBOXING_METHOD[tag]);
case Constants.T_OBJECT:
case Constants.T_ARRAY:
return il.append(fac.createCast(Type.OBJECT, type));
case Constants.T_VOID:
return il.append(InstructionConstants.POP);
default:
throw new RuntimeException("internal error");
}
}
static InstructionHandle emitInvoke(InstructionList il,
InstructionFactory fac, MethodRef method) {
String signature = method.getSignature();
Type[] args = Type.getArgumentTypes(signature);
Type ret = Type.getReturnType(signature);
String mname = method.getName();
String cname = method.getDeclaringClass().getName();
short kind;
if (method.getDeclaringClass().isInterface()) {
kind = Constants.INVOKEINTERFACE;
} else if (java.lang.reflect.Modifier.isStatic(method.getModifiers())) {
kind = Constants.INVOKESTATIC;
} else if (method.getName().charAt(0) == '<') {
kind = Constants.INVOKESPECIAL;
} else {
kind = Constants.INVOKEVIRTUAL;
}
return il.append(fac.createInvoke(cname, mname, ret, args, kind));
}
}
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