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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package selectionresolution;
import jdk.internal.org.objectweb.asm.ClassVisitor;
import jdk.internal.org.objectweb.asm.Handle;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import java.lang.invoke.CallSite;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_STATIC;
import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD;
import static jdk.internal.org.objectweb.asm.Opcodes.ARETURN;
import static jdk.internal.org.objectweb.asm.Opcodes.DUP;
import static jdk.internal.org.objectweb.asm.Opcodes.POP;
import static jdk.internal.org.objectweb.asm.Opcodes.NEW;
import static jdk.internal.org.objectweb.asm.Opcodes.SWAP;
import static jdk.internal.org.objectweb.asm.Opcodes.ASTORE;
import static jdk.internal.org.objectweb.asm.Opcodes.RETURN;
import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL;
import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESTATIC;
import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEINTERFACE;
import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEVIRTUAL;
import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESPECIAL;
import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESTATIC;
import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKEINTERFACE;
import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKEVIRTUAL;
class Method {
public static final String defaultMethodName = "m";
public static final String defaultMethodDescriptor = "()Ljava/lang/Integer;";
public static final String methodDescriptorTemplate = "(L%s;)Ljava/lang/Integer;";
private final ClassConstruct ownerClass;
private final String ownerClassName;
private final ClassVisitor cv;
private final MethodVisitor mv;
private final ClassBuilder.ExecutionMode execMode;
public Method(ClassConstruct ownerClass, ClassVisitor cv, String name, String descriptor, int access,
ClassBuilder.ExecutionMode execMode) {
this.ownerClassName = ownerClass.getName();
this.ownerClass = ownerClass;
this.execMode = execMode;
this.cv = cv;
mv = cv.visitMethod(access, name, descriptor, null, null);
mv.visitCode();
}
/**
* Add code for the m()Ljava/lang/Integer; method, always returns null
*/
public void makeDefaultMethod() {
mv.visitTypeInsn(NEW, "java/lang/Integer");
mv.visitInsn(DUP);
mv.visitLdcInsn(ownerClass.getIndex());
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Integer", "<init>", "(I)V");
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
public void makePrivateCallMethod(String className) {
makeSuperCallMethod(INVOKESPECIAL, className);
}
public void makeSuperCallMethod(int invokeInstruction, String className) {
mv.visitVarInsn(ALOAD, 0);
makeCall(invokeInstruction, className, false);
mv.visitInsn(POP);
done();
}
public void defaultInvoke(int instr, String className, String objectRef, boolean isInterface) {
switch (instr) {
case INVOKEVIRTUAL:
defaultInvokeVirtual(className, objectRef);
break;
case INVOKEINTERFACE:
defaultInvokeInterface(className, objectRef);
break;
case INVOKESTATIC:
defaultInvokeStatic(className, isInterface);
break;
case INVOKESPECIAL:
defaultInvokeSpecial(className, objectRef, isInterface);
break;
default:
break;
}
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private void defaultInvokeVirtual(String className, String objectRef) {
String objectRefPackageName = objectRef.substring(0, objectRef.lastIndexOf("/"));
makeNewObject(objectRef, objectRefPackageName);
makeCall(INVOKEVIRTUAL, className, false);
}
private void defaultInvokeInterface(String className, String objectRef) {
String objectRefPackageName = objectRef.substring(0, objectRef.lastIndexOf("/"));
makeNewObject(objectRef, objectRefPackageName);
makeCall(INVOKEINTERFACE, className, true);
}
private void defaultInvokeSpecial(String className, String objectRef, boolean isInterface) {
String objectRefPackageName = objectRef.substring(0, objectRef.lastIndexOf("/"));
makeNewObject(objectRef, objectRefPackageName);
makeCall(INVOKESPECIAL, className, isInterface);
}
private void defaultInvokeStatic(String className, boolean isInterface) {
makeCall(INVOKESTATIC, className, isInterface);
}
private Method makeCall(int invokeInstruction, String className, boolean isInterface) {
switch(execMode) {
case DIRECT: {
mv.visitMethodInsn(invokeInstruction, className, defaultMethodName, defaultMethodDescriptor, isInterface);
break;
}
case INDY: {
Handle m = convertToHandle(invokeInstruction, className, defaultMethodName, defaultMethodDescriptor);
Handle bsm = generateBootstrapMethod(m);
mv.visitInvokeDynamicInsn(defaultMethodName, defaultMethodDescriptor, bsm);
break;
}
case MH_INVOKE_EXACT:
case MH_INVOKE_GENERIC: {
String invokerName = execMode == ClassBuilder.ExecutionMode.MH_INVOKE_GENERIC
? "invoke" : "invokeExact";
Handle m = convertToHandle(invokeInstruction, className, defaultMethodName, defaultMethodDescriptor);
mv.visitLdcInsn(m);
mv.visitInsn(SWAP);
mv.visitMethodInsn(INVOKEVIRTUAL,
"java/lang/invoke/MethodHandle",
invokerName,
String.format(methodDescriptorTemplate, className),
false);
break;
}
default:
throw new Error("Unknown execution mode: " + execMode);
}
return this;
}
private Handle generateBootstrapMethod(Handle h) {
String bootstrapName = "bootstrapMethod";
MethodType bootstrapType = MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class);
MethodVisitor bmv = cv.visitMethod(ACC_PUBLIC | ACC_STATIC, bootstrapName, bootstrapType.toMethodDescriptorString(), null, null);
bmv.visitCode();
String constCallSite = "java/lang/invoke/ConstantCallSite";
bmv.visitTypeInsn(NEW, constCallSite);
bmv.visitInsn(DUP);
bmv.visitLdcInsn(h);
bmv.visitMethodInsn(INVOKESPECIAL, constCallSite, "<init>", "(Ljava/lang/invoke/MethodHandle;)V", false);
bmv.visitInsn(ARETURN);
bmv.visitMaxs(0,0);
bmv.visitEnd();
return new Handle(H_INVOKESTATIC, ownerClassName, bootstrapName, bootstrapType.toMethodDescriptorString());
}
private static Handle convertToHandle(int invokeInstruction, String className, String methodName, String methodDesc) {
int tag;
switch (invokeInstruction) {
case INVOKEVIRTUAL: tag = H_INVOKEVIRTUAL; break;
case INVOKEINTERFACE: tag = H_INVOKEINTERFACE; break;
case INVOKESPECIAL: tag = H_INVOKESPECIAL; break;
case INVOKESTATIC: tag = H_INVOKESTATIC; break;
default:
throw new Error("Unknown invoke instruction: "+invokeInstruction);
}
return new Handle(tag, className, methodName, methodDesc);
}
private void makeNewObject(String objectRef, String objectRefPackageName) {
String className = objectRef.substring(objectRef.lastIndexOf("/") + 1);
makeStaticCall( objectRefPackageName + "/Helper",
"get" + className,
"()L" + objectRef + ";", false);
mv.visitVarInsn(ASTORE, 1);
mv.visitVarInsn(ALOAD, 1);
}
public void makeTestCall(String className) {
mv.visitTypeInsn(NEW, className);
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "()V", false);
mv.visitVarInsn(ASTORE, 1);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, className, "test", "()Ljava/lang/Integer;", false);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
public Method makeStaticCall(String classname, String method, String descriptor, boolean isInterface) {
mv.visitMethodInsn(INVOKESTATIC, classname, method, descriptor, isInterface);
return this;
}
public void makeConstructor(String extending, boolean isInterface) {
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, extending == null ? "java/lang/Object" : extending, "<init>", "()V", isInterface);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
public void makeInstantiateMethod(String className) {
mv.visitTypeInsn(NEW, className);
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "()V", false);
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
public void done() {
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
}
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