// 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.cf.code;

import com.android.tools.r8.cf.CfPrinter;
import com.android.tools.r8.errors.Unreachable;
import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.CfCode;
import com.android.tools.r8.graph.DexItemFactory;
import com.android.tools.r8.graph.GraphLens;
import com.android.tools.r8.graph.InitClassLens;
import com.android.tools.r8.graph.ProgramMethod;
import com.android.tools.r8.ir.code.MemberType;
import com.android.tools.r8.ir.conversion.CfSourceCode;
import com.android.tools.r8.ir.conversion.CfState;
import com.android.tools.r8.ir.conversion.CfState.Slot;
import com.android.tools.r8.ir.conversion.IRBuilder;
import com.android.tools.r8.ir.conversion.LensCodeRewriterUtils;
import com.android.tools.r8.ir.optimize.Inliner.ConstraintWithTarget;
import com.android.tools.r8.ir.optimize.InliningConstraints;
import com.android.tools.r8.naming.NamingLens;
import com.android.tools.r8.optimize.interfaces.analysis.CfAnalysisConfig;
import com.android.tools.r8.optimize.interfaces.analysis.CfFrameState;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class CfArrayStore extends CfArrayLoadOrStore {

  public CfArrayStore(MemberType type) {
    super(type);
  }

  @Override
  public int getCompareToId() {
    return getStoreType();
  }

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

  @Override
  public CfArrayStore asArrayStore() {
    return this;
  }

  private int getStoreType() {
    switch (getType()) {
      case OBJECT:
        return Opcodes.AASTORE;
      case BOOLEAN_OR_BYTE:
        return Opcodes.BASTORE;
      case CHAR:
        return Opcodes.CASTORE;
      case SHORT:
        return Opcodes.SASTORE;
      case INT:
        return Opcodes.IASTORE;
      case FLOAT:
        return Opcodes.FASTORE;
      case LONG:
        return Opcodes.LASTORE;
      case DOUBLE:
        return Opcodes.DASTORE;
      default:
        throw new Unreachable("Unexpected type " + getType());
    }
  }

  @Override
  public void write(
      AppView<?> appView,
      ProgramMethod context,
      DexItemFactory dexItemFactory,
      GraphLens graphLens,
      InitClassLens initClassLens,
      NamingLens namingLens,
      LensCodeRewriterUtils rewriter,
      MethodVisitor visitor) {
    visitor.visitInsn(getStoreType());
  }

  @Override
  public void print(CfPrinter printer) {
    printer.print(this);
  }

  @Override
  public void buildIR(IRBuilder builder, CfState state, CfSourceCode code) {
    Slot value = state.pop();
    Slot index = state.pop();
    Slot array = state.pop();
    builder.addArrayPut(getType(), value.register, array.register, index.register);
  }

  @Override
  public ConstraintWithTarget inliningConstraint(
      InliningConstraints inliningConstraints, CfCode code, ProgramMethod context) {
    return inliningConstraints.forArrayPut();
  }

  @Override
  public CfFrameState evaluate(CfFrameState frame, AppView<?> appView, CfAnalysisConfig config) {
    // ..., arrayref, index, value →
    // ...
    DexItemFactory dexItemFactory = appView.dexItemFactory();
    return frame
        .popInitialized(appView, config, getType())
        .popInitialized(appView, config, dexItemFactory.intType)
        .popInitialized(appView, config, getExpectedArrayType(dexItemFactory));
  }
}