src/main/java/com/android/tools/r8/ir/code/JumpInstruction.java

// 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.graph.DexType;
import com.android.tools.r8.ir.optimize.Inliner.Constraint;
import com.android.tools.r8.shaking.Enqueuer.AppInfoWithLiveness;
import com.android.tools.r8.utils.InternalOptions;
import java.util.List;

public abstract class JumpInstruction extends Instruction {

  public JumpInstruction(Value out) {
    super(null);
  }

  public JumpInstruction(Value out, Value in) {
    super(out, in);
  }

  public JumpInstruction(Value out, List<? extends Value> ins) {
    super(out, ins);
  }

  public BasicBlock fallthroughBlock() {
    return null;
  }

  public void setFallthroughBlock(BasicBlock block) {
    assert false : "We should not change the fallthrough of a JumpInstruction with no fallthrough.";
  }

  @Override
  public boolean canBeDeadCode(IRCode code, InternalOptions options) {
    return false;
  }

  @Override
  public boolean isJumpInstruction() {
    return true;
  }

  @Override
  public JumpInstruction asJumpInstruction() {
    return this;
  }

  @Override
  public Constraint inliningConstraint(AppInfoWithLiveness info, DexType invocationContext) {
    return Constraint.ALWAYS;
  }

  static String blockNumberToString(BasicBlock block) {
    try {
      return "" + block.getNumber();
    } catch (AssertionError e) {
      return "<invalid>";
    }
  }
}