| // 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.code; |
| |
| import com.android.tools.r8.cf.LoadStoreHelper; |
| import com.android.tools.r8.errors.Unreachable; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.ProgramMethod; |
| 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; |
| |
| public class DebugLocalRead extends Instruction { |
| private static final String ERROR_MESSAGE = "Unexpected attempt to emit debug-local read."; |
| |
| public DebugLocalRead() { |
| super(null); |
| } |
| |
| @Override |
| public int opcode() { |
| return Opcodes.DEBUG_LOCAL_READ; |
| } |
| |
| @Override |
| public <T> T accept(InstructionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public boolean isDebugLocalRead() { |
| return true; |
| } |
| |
| @Override |
| public DebugLocalRead asDebugLocalRead() { |
| return this; |
| } |
| |
| @Override |
| public void buildDex(DexBuilder builder) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public void buildCf(CfBuilder builder) { |
| throw new Unreachable(ERROR_MESSAGE); |
| } |
| |
| @Override |
| public boolean identicalNonValueNonPositionParts(Instruction other) { |
| return other.isDebugLocalRead(); |
| } |
| |
| @Override |
| public int maxInValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public int maxOutValueRegister() { |
| throw new Unreachable(); |
| } |
| |
| @Override |
| public ConstraintWithTarget inliningConstraint( |
| InliningConstraints inliningConstraints, ProgramMethod context) { |
| return inliningConstraints.forDebugLocalRead(); |
| } |
| |
| @Override |
| public DeadInstructionResult canBeDeadCode(AppView<?> appView, IRCode code) { |
| // Reads are never dead code. |
| // They should also have a non-empty set of debug values (see RegAlloc::computeDebugInfo) |
| return DeadInstructionResult.notDead(); |
| } |
| |
| @Override |
| public boolean hasInvariantOutType() { |
| return true; |
| } |
| |
| @Override |
| public void insertLoadAndStores(InstructionListIterator it, LoadStoreHelper helper) { |
| // Non-materializing so no stack values are needed. |
| } |
| |
| @Override |
| public boolean instructionMayTriggerMethodInvocation(AppView<?> appView, ProgramMethod context) { |
| return false; |
| } |
| |
| @Override |
| public boolean isAllowedAfterThrowingInstruction() { |
| return true; |
| } |
| } |