// 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.code;

import com.android.tools.r8.errors.InternalCompilerError;
import com.android.tools.r8.graph.DexMethodHandle;
import com.android.tools.r8.graph.ObjectToOffsetMapping;
import com.android.tools.r8.graph.OffsetToObjectMapping;
import com.android.tools.r8.graph.UseRegistry;
import com.android.tools.r8.graph.UseRegistry.MethodHandleUse;
import com.android.tools.r8.ir.conversion.IRBuilder;
import com.android.tools.r8.naming.ClassNameMapper;
import java.nio.ShortBuffer;

public class ConstMethodHandle extends Format21c {

  public static final int OPCODE = 0xfe;
  public static final String NAME = "ConstMethodHandle";
  public static final String SMALI_NAME = "const-method-handle";

  ConstMethodHandle(int high, BytecodeStream stream, OffsetToObjectMapping mapping) {
    super(high, stream, mapping.getMethodHandleMap());
  }

  public ConstMethodHandle(int register, DexMethodHandle methodHandle) {
    super(register, methodHandle);
  }

  public DexMethodHandle getMethodHandle() {
    return (DexMethodHandle) BBBB;
  }

  @Override
  public String getName() {
    return NAME;
  }

  @Override
  public String getSmaliName() {
    return SMALI_NAME;
  }

  @Override
  public int getOpcode() {
    return OPCODE;
  }

  @Override
  public String toString(ClassNameMapper naming) {
    return formatString("v" + AA + ", \"" + BBBB.toString() + "\"");
  }

  @Override
  public String toSmaliString(ClassNameMapper naming) {
    return formatSmaliString("v" + AA + ", \"" + BBBB.toString() + "\"");
  }

  @Override
  public void registerUse(UseRegistry registry) {
    registry.registerMethodHandle(
        getMethodHandle(), MethodHandleUse.NOT_ARGUMENT_TO_LAMBDA_METAFACTORY);
  }

  @Override
  public void write(ShortBuffer dest, ObjectToOffsetMapping mapping) {
    int index = BBBB.getOffset(mapping);
    if (index != (index & 0xffff)) {
      throw new InternalCompilerError("MethodHandle-index overflow.");
    }
    super.write(dest, mapping);
  }

  @Override
  public void buildIR(IRBuilder builder) {
    builder.addConstMethodHandle(AA, (DexMethodHandle) BBBB);
  }

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