| // Copyright (c) 2016, 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.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.cf.TypeVerificationHelper; |
| import com.android.tools.r8.dex.Constants; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| import com.android.tools.r8.utils.InternalOptions; |
| |
| /** |
| * Argument pseudo instruction used to introduce values for all arguments for SSA conversion. |
| */ |
| public class Argument extends Instruction { |
| |
| public Argument(Value outValue) { |
| super(outValue); |
| outValue.markAsArgument(); |
| super.setPosition(Position.none()); |
| } |
| |
| @Override |
| public void setPosition(Position position) { |
| // Arguments never have positional information as they never materialize to actual instructions. |
| } |
| |
| @Override |
| public boolean canBeDeadCode(IRCode code, InternalOptions options) { |
| // Never remove argument instructions. That would change the signature of the method. |
| // TODO(ager): If we can tell that a method never uses an argument we might be able to |
| // rewrite the signature and call-sites. |
| return false; |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| assert false : "Argument has no register arguments."; |
| return 0; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| return Constants.U16BIT_MAX; |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| builder.addArgument(this); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return other.isArgument(); |
| } |
| |
| @Override |
| public int compareNonValueParts(Instruction other) { |
| assert other.isArgument(); |
| return 0; |
| } |
| |
| @Override |
| public boolean isArgument() { |
| return true; |
| } |
| |
| @Override |
| public Argument asArgument() { |
| return this; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, DexType invocationContext) { |
| return inliningConstraints.forArgument(); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| // Arguments are defined by locals so nothing to load or store. |
| } |
| |
| @Override |
| public DexType computeVerificationType(TypeVerificationHelper helper) { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.addArgument(this); |
| } |
| } |