| // 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.graph.AppView; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.analysis.type.Nullability; |
| 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 com.android.tools.r8.utils.InternalOptions; |
| |
| public class MoveException extends Instruction { |
| private final DexType exceptionType; |
| private final InternalOptions options; |
| |
| public MoveException(Value dest, DexType exceptionType, InternalOptions options) { |
| super(dest); |
| this.exceptionType = exceptionType; |
| this.options = options; |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.MOVE_EXCEPTION; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| public Value dest() { |
| return outValue; |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| int dest = builder.allocatedRegister(dest(), getNumber()); |
| builder.add(this, new com.android.tools.r8.code.MoveException(dest)); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| assert false : "MoveException has no register arguments."; |
| return 0; |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| return Constants.U8BIT_MAX; |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| if (!other.isMoveException()) { |
| return false; |
| } |
| if (options.canHaveExceptionTypeBug()) { |
| return other.asMoveException().exceptionType == exceptionType; |
| } |
| return true; |
| } |
| |
| @Override |
| public boolean isMoveException() { |
| return true; |
| } |
| |
| @Override |
| public MoveException asMoveException() { |
| return this; |
| } |
| |
| @Override |
| public DeadInstructionResult canBeDeadCode(AppView<?> appView, IRCode code) { |
| InternalOptions options = appView.options(); |
| if (options.debug |
| || code.context().getDefinition().getOptimizationInfo().isReachabilitySensitive() |
| || options.isGeneratingClassFiles()) { |
| return DeadInstructionResult.notDead(); |
| } |
| return DeadInstructionResult.deadIfOutValueIsDead(); |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forMoveException(); |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| helper.storeOutValue(this, it); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| // Nothing to do. The exception is implicitly pushed on the stack. |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return true; |
| } |
| |
| @Override |
| public DexType computeVerificationType(AppView<?> appView, TypeVerificationHelper helper) { |
| return exceptionType; |
| } |
| |
| @Override |
| public TypeElement evaluate(AppView<?> appView) { |
| return TypeElement.fromDexType(exceptionType, Nullability.definitelyNotNull(), appView); |
| } |
| |
| public DexType getExceptionType() { |
| return exceptionType; |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| } |