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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed 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 com.android.dx.rop.code;
import com.android.dx.rop.cst.CstMethodRef;
import com.android.dx.rop.cst.CstNat;
import com.android.dx.rop.cst.CstProtoRef;
import com.android.dx.rop.cst.CstString;
import com.android.dx.rop.cst.CstType;
import com.android.dx.rop.type.Type;
import com.android.dx.rop.type.TypeList;
/**
* An invoke-polymorphic instruction. This is a throwing instruction with
* multiple constants.
*/
public class InvokePolymorphicInsn extends Insn {
/** Default descriptor for signature polymorphic methods. */
private static final CstString DEFAULT_DESCRIPTOR =
new CstString("([Ljava/lang/Object;)Ljava/lang/Object;");
/** Descriptor for VarHandle set methods. */
private static final CstString VARHANDLE_SET_DESCRIPTOR =
new CstString("([Ljava/lang/Object;)V");
/** Descriptor for VarHandle compare-and-set methods. */
private static final CstString VARHANDLE_COMPARE_AND_SET_DESCRIPTOR =
new CstString("([Ljava/lang/Object;)Z");
/** {@code non-null;} list of exceptions caught */
private final TypeList catches;
/**
* {@code non-null;} method as it appears at the call site of the original
* invoke-virtual instruction. This is used to construct the invoke method
* to target and the call-site prototype.
*/
private final CstMethodRef callSiteMethod;
/**
* {@code non-null;} signature polymorphic method.
*/
private final CstMethodRef polymorphicMethod;
/**
* {@code non-null;} the call site prototype.
*/
private final CstProtoRef callSiteProto;
/**
* Constructs an instance.
*
* @param opcode {@code non-null;} the opcode
* @param position {@code non-null;} source position
* @param sources {@code non-null;} specs for all the sources
* @param catches {@code non-null;} list of exceptions caught
* @param callSiteMethod {@code non-null;} the method called by
* invoke-virtual that this instance will replace.
*/
public InvokePolymorphicInsn(Rop opcode, SourcePosition position, RegisterSpecList sources, TypeList catches,
CstMethodRef callSiteMethod) {
super(opcode, position, null, sources);
if (opcode.getBranchingness() != Rop.BRANCH_THROW) {
throw new IllegalArgumentException("opcode with invalid branchingness: " + opcode.getBranchingness());
}
if (catches == null) {
throw new NullPointerException("catches == null");
}
this.catches = catches;
if (callSiteMethod == null) {
throw new NullPointerException("callSiteMethod == null");
} else if (!callSiteMethod.isSignaturePolymorphic()) {
throw new IllegalArgumentException("callSiteMethod is not signature polymorphic");
}
this.callSiteMethod = callSiteMethod;
this.polymorphicMethod = makePolymorphicMethod(callSiteMethod);
this.callSiteProto = makeCallSiteProto(callSiteMethod);
}
/** {@inheritDoc} */
@Override
public TypeList getCatches() {
return this.catches;
}
/** {@inheritDoc} */
@Override
public void accept(Visitor visitor) {
visitor.visitInvokePolymorphicInsn(this);
}
/** {@inheritDoc} */
@Override
public Insn withAddedCatch(Type type) {
return new InvokePolymorphicInsn(getOpcode(), getPosition(),
getSources(), catches.withAddedType(type), getCallSiteMethod());
}
/** {@inheritDoc} */
@Override
public Insn withRegisterOffset(int delta) {
return new InvokePolymorphicInsn(getOpcode(), getPosition(),
getSources().withOffset(delta),
catches, getCallSiteMethod());
}
/** {@inheritDoc} */
@Override
public Insn withNewRegisters(RegisterSpec result, RegisterSpecList sources) {
return new InvokePolymorphicInsn(getOpcode(), getPosition(),
sources, catches, getCallSiteMethod());
}
/**
* Gets the method as it appears at the call site of the original
* invoke-virtual instruction.
*
* @return {@code non-null;} the original method reference
*/
public CstMethodRef getCallSiteMethod() {
return callSiteMethod;
}
/**
* Gets the method to be invoked. This will be will either be
* {@code java.lang.invoke.MethodHandle.invoke()} or
* {@code java.lang.invoke.MethodHandle.invokeExact()}.
*
* @return {@code non-null;} method reference to be invoked
*/
public CstMethodRef getPolymorphicMethod() {
return polymorphicMethod;
}
/**
* Gets the call site prototype. The call site prototype is provided
* as an argument to invoke-polymorphic to enable type checking and
* type conversion.
*
* @return {@code non-null;} Prototype reference for call site
*/
public CstProtoRef getCallSiteProto() {
return callSiteProto;
}
/** {@inheritDoc} */
@Override
public String getInlineString() {
return getPolymorphicMethod().toString() + " " +
getCallSiteProto().toString() + " " +
ThrowingInsn.toCatchString(catches);
}
private static CstMethodRef makePolymorphicMethod(final CstMethodRef callSiteMethod) {
CstType definingClass= callSiteMethod.getDefiningClass();
CstString cstMethodName = callSiteMethod.getNat().getName();
String methodName = callSiteMethod.getNat().getName().getString();
if (definingClass.equals(CstType.METHOD_HANDLE)) {
if (methodName.equals("invoke") || methodName.equals("invokeExact")) {
CstNat cstNat = new CstNat(cstMethodName, DEFAULT_DESCRIPTOR);
return new CstMethodRef(definingClass, cstNat);
}
}
if (definingClass.equals(CstType.VAR_HANDLE)) {
switch (methodName) {
case "compareAndExchange":
case "compareAndExchangeAcquire":
case "compareAndExchangeRelease":
case "get":
case "getAcquire":
case "getAndAdd":
case "getAndAddAcquire":
case "getAndAddRelease":
case "getAndBitwiseAnd":
case "getAndBitwiseAndAcquire":
case "getAndBitwiseAndRelease":
case "getAndBitwiseOr":
case "getAndBitwiseOrAcquire":
case "getAndBitwiseOrRelease":
case "getAndBitwiseXor":
case "getAndBitwiseXorAcquire":
case "getAndBitwiseXorRelease":
case "getAndSet":
case "getAndSetAcquire":
case "getAndSetRelease":
case "getOpaque":
case "getVolatile":
{
CstNat cstNat = new CstNat(cstMethodName, DEFAULT_DESCRIPTOR);
return new CstMethodRef(definingClass, cstNat);
}
case "set":
case "setOpaque":
case "setRelease":
case "setVolatile":
{
CstNat cstNat = new CstNat(cstMethodName, VARHANDLE_SET_DESCRIPTOR);
return new CstMethodRef(definingClass, cstNat);
}
case "compareAndSet":
case "weakCompareAndSet":
case "weakCompareAndSetAcquire":
case "weakCompareAndSetPlain":
case "weakCompareAndSetRelease":
{
CstNat cstNat = new CstNat(cstMethodName, VARHANDLE_COMPARE_AND_SET_DESCRIPTOR);
return new CstMethodRef(definingClass, cstNat);
}
default:
break;
}
}
throw new IllegalArgumentException("Unknown signature polymorphic method: " +
callSiteMethod.toHuman());
}
private static CstProtoRef makeCallSiteProto(final CstMethodRef callSiteMethod) {
return new CstProtoRef(callSiteMethod.getPrototype(true));
}
}
