src/main/java/com/android/tools/r8/ir/synthetic/ExceptionThrowingSourceCode.java

// Copyright (c) 2019, 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.synthetic;

import com.android.tools.r8.graph.DexItemFactory;
import com.android.tools.r8.graph.DexMethod;
import com.android.tools.r8.graph.DexProto;
import com.android.tools.r8.graph.DexType;
import com.android.tools.r8.ir.code.Invoke.Type;
import com.android.tools.r8.ir.code.Position;
import com.android.tools.r8.ir.code.ValueType;
import com.android.tools.r8.ir.conversion.IRBuilder;
import java.util.Collections;

// Source code representing simple forwarding method.
public final class ExceptionThrowingSourceCode extends SyntheticSourceCode {

  private static final int register = 0;
  private final DexType exceptionType;

  public ExceptionThrowingSourceCode(
      DexType receiver, DexMethod method, Position callerPosition, DexType exceptionType) {
    super(receiver, method, callerPosition);
    this.exceptionType = exceptionType;
  }

  @Override
  protected void prepareInstructions() {
    add(builder -> build(builder, exceptionType));
  }

  public static void build(IRBuilder builder, DexType exceptionType) {
    DexItemFactory factory = builder.appView.dexItemFactory();
    DexProto initProto = factory.createProto(factory.voidType);
    DexMethod initMethod =
        factory.createMethod(exceptionType, initProto, factory.constructorMethodName);
    builder.addNewInstance(register, exceptionType);
    builder.addInvoke(
        Type.DIRECT,
        initMethod,
        initMethod.proto,
        Collections.singletonList(ValueType.OBJECT),
        Collections.singletonList(register),
        false /* isInterface */);
    builder.addThrow(register);
  }
}