| // 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.AppView; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.analysis.type.TypeElement; |
| import com.android.tools.r8.ir.conversion.CfBuilder; |
| import com.android.tools.r8.ir.conversion.DexBuilder; |
| import com.android.tools.r8.ir.optimize.DeadCodeRemover.DeadInstructionResult; |
| import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget; |
| import com.android.tools.r8.ir.optimize.InliningConstraints; |
| import java.util.Set; |
| |
| /** |
| * Argument pseudo instruction used to introduce values for all arguments for SSA conversion. |
| */ |
| public class Argument extends Instruction { |
| |
| private final int index; |
| private final boolean knownToBeBoolean; |
| |
| public Argument(Value outValue, int index, boolean knownToBeBoolean) { |
| super(outValue); |
| this.index = index; |
| this.knownToBeBoolean = knownToBeBoolean; |
| } |
| |
| public static Builder builder() { |
| return new Builder(); |
| } |
| |
| public int getIndex() { |
| assert verifyIndex(); |
| return index; |
| } |
| |
| private boolean verifyIndex() { |
| int index = 0; |
| InstructionIterator instructionIterator = getBlock().iterator(); |
| while (instructionIterator.hasNext()) { |
| Instruction instruction = instructionIterator.next(); |
| assert instruction.isArgument(); |
| if (instruction == this) { |
| assert index == this.index; |
| return true; |
| } |
| index++; |
| } |
| return false; |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.ARGUMENT; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public DeadInstructionResult canBeDeadCode(AppView<?> appview, IRCode code) { |
| // Never remove argument instructions. That would change the signature of the method. |
| // TODO(b/65810338): If we can tell that a method never uses an argument we might be able to |
| // rewrite the signature and call-sites. |
| return DeadInstructionResult.notDead(); |
| } |
| |
| @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 boolean isArgument() { |
| return true; |
| } |
| |
| @Override |
| public Argument asArgument() { |
| return this; |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| 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(AppView<?> appView, TypeVerificationHelper helper) { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| builder.addArgument(this); |
| } |
| |
| @Override |
| public TypeElement evaluate(AppView<?> appView) { |
| return outValue.getType(); |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return true; |
| } |
| |
| @Override |
| public boolean outTypeKnownToBeBoolean(Set<Phi> seen) { |
| return knownToBeBoolean; |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| |
| public static class Builder extends BuilderBase<Builder, Argument> { |
| |
| private int index; |
| private boolean knownToBeBoolean; |
| |
| public Builder setIndex(int index) { |
| this.index = index; |
| return this; |
| } |
| |
| @Override |
| public Argument build() { |
| return amend(new Argument(outValue, index, knownToBeBoolean)); |
| } |
| |
| @Override |
| public Builder self() { |
| return this; |
| } |
| } |
| } |