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// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.ir.conversion;
import com.android.tools.r8.graph.AppInfoWithSubtyping;
import com.android.tools.r8.graph.DexCallSite;
import com.android.tools.r8.graph.DexClass;
import com.android.tools.r8.graph.DexEncodedMethod;
import com.android.tools.r8.graph.DexField;
import com.android.tools.r8.graph.DexMethod;
import com.android.tools.r8.graph.DexMethodHandle;
import com.android.tools.r8.graph.DexMethodHandle.MethodHandleType;
import com.android.tools.r8.graph.DexType;
import com.android.tools.r8.graph.DexValue;
import com.android.tools.r8.graph.DexValue.DexValueMethodHandle;
import com.android.tools.r8.graph.GraphLense;
import com.android.tools.r8.ir.code.BasicBlock;
import com.android.tools.r8.ir.code.CheckCast;
import com.android.tools.r8.ir.code.ConstClass;
import com.android.tools.r8.ir.code.IRCode;
import com.android.tools.r8.ir.code.InstanceGet;
import com.android.tools.r8.ir.code.InstanceOf;
import com.android.tools.r8.ir.code.InstancePut;
import com.android.tools.r8.ir.code.Instruction;
import com.android.tools.r8.ir.code.InstructionListIterator;
import com.android.tools.r8.ir.code.Invoke;
import com.android.tools.r8.ir.code.Invoke.Type;
import com.android.tools.r8.ir.code.InvokeCustom;
import com.android.tools.r8.ir.code.InvokeMethod;
import com.android.tools.r8.ir.code.InvokeNewArray;
import com.android.tools.r8.ir.code.NewArrayEmpty;
import com.android.tools.r8.ir.code.StaticGet;
import com.android.tools.r8.ir.code.StaticPut;
import com.android.tools.r8.ir.code.Value;
import java.util.List;
import java.util.ListIterator;
import java.util.stream.Collectors;
public class LensCodeRewriter {
private final GraphLense graphLense;
private final AppInfoWithSubtyping appInfo;
public LensCodeRewriter(GraphLense graphLense, AppInfoWithSubtyping appInfo) {
this.graphLense = graphLense;
this.appInfo = appInfo;
}
private Value makeOutValue(Instruction insn, IRCode code) {
if (insn.outValue() == null) {
return null;
} else {
return code.createValue(insn.outType(), insn.getLocalInfo());
}
}
/**
* Replace invoke targets and field accesses with actual definitions.
*/
public void rewrite(IRCode code, DexEncodedMethod method) {
ListIterator<BasicBlock> blocks = code.blocks.listIterator();
while (blocks.hasNext()) {
BasicBlock block = blocks.next();
InstructionListIterator iterator = block.listIterator();
while (iterator.hasNext()) {
Instruction current = iterator.next();
if (current.isInvokeCustom()) {
InvokeCustom invokeCustom = current.asInvokeCustom();
DexCallSite callSite = invokeCustom.getCallSite();
DexMethodHandle newBootstrapMethod = rewriteDexMethodHandle(method,
callSite.bootstrapMethod);
List<DexValue> newArgs = callSite.bootstrapArgs.stream().map(
(arg) -> {
if (arg instanceof DexValueMethodHandle) {
return new DexValueMethodHandle(
rewriteDexMethodHandle(method, ((DexValueMethodHandle) arg).value));
}
return arg;
})
.collect(Collectors.toList());
if (newBootstrapMethod != callSite.bootstrapMethod
|| !newArgs.equals(callSite.bootstrapArgs)) {
DexCallSite newCallSite = appInfo.dexItemFactory.createCallSite(
callSite.methodName, callSite.methodProto, newBootstrapMethod, newArgs);
InvokeCustom newInvokeCustom = new InvokeCustom(newCallSite, invokeCustom.outValue(),
invokeCustom.inValues());
iterator.replaceCurrentInstruction(newInvokeCustom);
}
} else if (current.isInvokeMethod()) {
InvokeMethod invoke = current.asInvokeMethod();
DexMethod invokedMethod = invoke.getInvokedMethod();
DexType invokedHolder = invokedMethod.getHolder();
if (!invokedHolder.isClassType()) {
continue;
}
DexMethod actualTarget = graphLense.lookupMethod(invokedMethod, method);
Invoke.Type invokeType = getInvokeType(invoke, actualTarget, invokedMethod);
if (actualTarget != invokedMethod || invoke.getType() != invokeType) {
Invoke newInvoke = Invoke
.create(invokeType, actualTarget, null,
invoke.outValue(), invoke.inValues());
iterator.replaceCurrentInstruction(newInvoke);
// Fix up the return type if needed.
if (actualTarget.proto.returnType != invokedMethod.proto.returnType
&& newInvoke.outValue() != null) {
Value newValue = code.createValue(newInvoke.outType(), invoke.getLocalInfo());
newInvoke.outValue().replaceUsers(newValue);
CheckCast cast = new CheckCast(
newValue,
newInvoke.outValue(),
graphLense.lookupType(invokedMethod.proto.returnType, method));
cast.setPosition(current.getPosition());
iterator.add(cast);
// If the current block has catch handlers split the check cast into its own block.
if (newInvoke.getBlock().hasCatchHandlers()) {
iterator.previous();
iterator.split(code, 1, blocks);
}
}
}
} else if (current.isInstanceGet()) {
InstanceGet instanceGet = current.asInstanceGet();
DexField field = instanceGet.getField();
DexField actualField = graphLense.lookupField(field, method);
if (actualField != field) {
InstanceGet newInstanceGet =
new InstanceGet(
instanceGet.getType(), instanceGet.dest(), instanceGet.object(), actualField);
iterator.replaceCurrentInstruction(newInstanceGet);
}
} else if (current.isInstancePut()) {
InstancePut instancePut = current.asInstancePut();
DexField field = instancePut.getField();
DexField actualField = graphLense.lookupField(field, method);
if (actualField != field) {
InstancePut newInstancePut =
new InstancePut(instancePut.getType(), instancePut.inValues(), actualField);
iterator.replaceCurrentInstruction(newInstancePut);
}
} else if (current.isStaticGet()) {
StaticGet staticGet = current.asStaticGet();
DexField field = staticGet.getField();
DexField actualField = graphLense.lookupField(field, method);
if (actualField != field) {
StaticGet newStaticGet =
new StaticGet(staticGet.getType(), staticGet.dest(), actualField);
iterator.replaceCurrentInstruction(newStaticGet);
}
} else if (current.isStaticPut()) {
StaticPut staticPut = current.asStaticPut();
DexField field = staticPut.getField();
DexField actualField = graphLense.lookupField(field, method);
if (actualField != field) {
StaticPut newStaticPut =
new StaticPut(staticPut.getType(), staticPut.inValue(), actualField);
iterator.replaceCurrentInstruction(newStaticPut);
}
} else if (current.isCheckCast()) {
CheckCast checkCast = current.asCheckCast();
DexType newType = graphLense.lookupType(checkCast.getType(), method);
if (newType != checkCast.getType()) {
CheckCast newCheckCast =
new CheckCast(makeOutValue(checkCast, code), checkCast.object(), newType);
iterator.replaceCurrentInstruction(newCheckCast);
}
} else if (current.isConstClass()) {
ConstClass constClass = current.asConstClass();
DexType newType = graphLense.lookupType(constClass.getValue(), method);
if (newType != constClass.getValue()) {
ConstClass newConstClass = new ConstClass(makeOutValue(constClass, code), newType);
iterator.replaceCurrentInstruction(newConstClass);
}
} else if (current.isInstanceOf()) {
InstanceOf instanceOf = current.asInstanceOf();
DexType newType = graphLense.lookupType(instanceOf.type(), method);
if (newType != instanceOf.type()) {
InstanceOf newInstanceOf = new InstanceOf(makeOutValue(instanceOf, code),
instanceOf.value(), newType);
iterator.replaceCurrentInstruction(newInstanceOf);
}
} else if (current.isInvokeNewArray()) {
InvokeNewArray newArray = current.asInvokeNewArray();
DexType newType = graphLense.lookupType(newArray.getArrayType(), method);
if (newType != newArray.getArrayType()) {
InvokeNewArray newNewArray = new InvokeNewArray(newType, makeOutValue(newArray, code),
newArray.inValues());
iterator.replaceCurrentInstruction(newNewArray);
}
} else if (current.isNewArrayEmpty()) {
NewArrayEmpty newArrayEmpty = current.asNewArrayEmpty();
DexType newType = graphLense.lookupType(newArrayEmpty.type, method);
if (newType != newArrayEmpty.type) {
NewArrayEmpty newNewArray = new NewArrayEmpty(makeOutValue(newArrayEmpty, code),
newArrayEmpty.size(), newType);
iterator.replaceCurrentInstruction(newNewArray);
}
}
}
}
assert code.isConsistentSSA();
}
private DexMethodHandle rewriteDexMethodHandle(
DexEncodedMethod method, DexMethodHandle methodHandle) {
if (methodHandle.isMethodHandle()) {
DexMethod invokedMethod = methodHandle.asMethod();
DexMethod actualTarget = graphLense.lookupMethod(invokedMethod, method);
if (actualTarget != invokedMethod) {
DexClass clazz = appInfo.definitionFor(actualTarget.holder);
MethodHandleType newType = methodHandle.type;
if (clazz != null
&& (newType.isInvokeInterface() || newType.isInvokeInstance())) {
newType = clazz.accessFlags.isInterface()
? MethodHandleType.INVOKE_INTERFACE
: MethodHandleType.INVOKE_INSTANCE;
}
return new DexMethodHandle(newType, actualTarget);
}
} else {
DexField field = methodHandle.asField();
DexField actualField = graphLense.lookupField(field, method);
if (actualField != field) {
return new DexMethodHandle(methodHandle.type, actualField);
}
}
return methodHandle;
}
private Type getInvokeType(InvokeMethod invoke, DexMethod actualTarget,
DexMethod originalTarget) {
if (invoke.isInvokeVirtual() || invoke.isInvokeInterface()) {
// Get the invoke type of the actual definition.
DexClass newTargetClass = appInfo.definitionFor(actualTarget.holder);
if (newTargetClass == null) {
return invoke.getType();
} else {
DexClass originalTargetClass = appInfo.definitionFor(originalTarget.holder);
if (originalTargetClass.isInterface() ^ (invoke.getType() == Type.INTERFACE)) {
// The invoke was wrong to start with, so we keep it wrong. This is to ensure we get
// the IncompatibleClassChangeError the original invoke would have triggered.
return newTargetClass.accessFlags.isInterface()
? Type.VIRTUAL
: Type.INTERFACE;
} else {
return newTargetClass.accessFlags.isInterface()
? Type.INTERFACE
: Type.VIRTUAL;
}
}
} else {
return invoke.getType();
}
}
}
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