content: /*
   * Copyright (C) 2008 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.taobao.android.dx.dex.code;
  
  import com.taobao.android.dx.io.Opcodes;
  import com.taobao.android.dx.rop.code.RegisterSpecList;
  import com.taobao.android.dx.rop.code.SourcePosition;
  import com.taobao.android.dx.rop.cst.Constant;
  import com.taobao.android.dx.rop.cst.CstLiteral32;
  import com.taobao.android.dx.rop.cst.CstLiteral64;
  import com.taobao.android.dx.rop.cst.CstType;
  import com.taobao.android.dx.util.AnnotatedOutput;
  import com.taobao.android.dx.util.Hex;
  import java.util.ArrayList;
  
  /**
   * Pseudo-instruction which holds fill array data.
   */
  public final class ArrayData extends VariableSizeInsn {
      /**
       * {@code non-null;} address representing the instruction that uses this
       * instance
       */
      private final CodeAddress user;
  
      /** {@code non-null;} initial values to be filled into an array */
      private final ArrayList<Constant> values;
  
      /** non-null: type of constant that initializes the array */
      private final Constant arrayType;
  
      /** Width of the init value element */
      private final int elemWidth;
  
      /** Length of the init list */
      private final int initLength;
  
      /**
       * Constructs an instance. The output address of this instance is initially
       * unknown ({@code -1}).
       *
       * @param position {@code non-null;} source position
       * @param user {@code non-null;} address representing the instruction that
       * uses this instance
       * @param values {@code non-null;} initial values to be filled into an array
       */
      public ArrayData(SourcePosition position, CodeAddress user,
                       ArrayList<Constant> values,
                       Constant arrayType) {
          super(position, RegisterSpecList.EMPTY);
  
          if (user == null) {
              throw new NullPointerException("user == null");
          }
  
          if (values == null) {
              throw new NullPointerException("values == null");
          }
  
          int sz = values.size();
  
          if (sz <= 0) {
              throw new IllegalArgumentException("Illegal number of init values");
          }
  
          this.arrayType = arrayType;
  
          if (arrayType == CstType.BYTE_ARRAY ||
                  arrayType == CstType.BOOLEAN_ARRAY) {
              elemWidth = 1;
          } else if (arrayType == CstType.SHORT_ARRAY ||
                  arrayType == CstType.CHAR_ARRAY) {
              elemWidth = 2;
          } else if (arrayType == CstType.INT_ARRAY ||
                  arrayType == CstType.FLOAT_ARRAY) {
              elemWidth = 4;
          } else if (arrayType == CstType.LONG_ARRAY ||
                  arrayType == CstType.DOUBLE_ARRAY) {
              elemWidth = 8;
          } else {
              throw new IllegalArgumentException("Unexpected constant type");
          }
          this.user = user;
          this.values = values;
          initLength = values.size();
      }
  
      /** {@inheritDoc} */
      @Override
      public int codeSize() {
          int sz = initLength;
          // Note: the unit here is 16-bit
          return 4 + ((sz * elemWidth) + 1) / 2;
      }
  
      /** {@inheritDoc} */
      @Override
      public void writeTo(AnnotatedOutput out) {
          int sz = values.size();
  
          out.writeShort(Opcodes.FILL_ARRAY_DATA_PAYLOAD);
          out.writeShort(elemWidth);
          out.writeInt(initLength);
  
  
          // For speed reasons, replicate the for loop in each case
          switch (elemWidth) {
              case 1: {
                  for (int i = 0; i < sz; i++) {
                      Constant cst = values.get(i);
                      out.writeByte((byte) ((CstLiteral32) cst).getIntBits());
                  }
                  break;
              }
              case 2: {
                  for (int i = 0; i < sz; i++) {
                      Constant cst = values.get(i);
                      out.writeShort((short) ((CstLiteral32) cst).getIntBits());
                  }
                  break;
              }
              case 4: {
                  for (int i = 0; i < sz; i++) {
                      Constant cst = values.get(i);
                      out.writeInt(((CstLiteral32) cst).getIntBits());
                  }
                  break;
              }
              case 8: {
                  for (int i = 0; i < sz; i++) {
                      Constant cst = values.get(i);
                      out.writeLong(((CstLiteral64) cst).getLongBits());
                  }
                  break;
              }
              default:
                  break;
          }
  
          // Pad one byte to make the size of data table multiples of 16-bits
          if (elemWidth == 1 && (sz % 2 != 0)) {
              out.writeByte(0x00);
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public DalvInsn withRegisters(RegisterSpecList registers) {
          return new ArrayData(getPosition(), user, values, arrayType);
      }
  
      /** {@inheritDoc} */
      @Override
      protected String argString() {
          StringBuffer sb = new StringBuffer(100);
  
          int sz = values.size();
          for (int i = 0; i < sz; i++) {
              sb.append("\n    ");
              sb.append(i);
              sb.append(": ");
              sb.append(values.get(i).toHuman());
          }
  
          return sb.toString();
      }
  
      /** {@inheritDoc} */
      @Override
      protected String listingString0(boolean noteIndices) {
          int baseAddress = user.getAddress();
          StringBuffer sb = new StringBuffer(100);
          int sz = values.size();
  
          sb.append("fill-array-data-payload // for fill-array-data @ ");
          sb.append(Hex.u2(baseAddress));
  
          for (int i = 0; i < sz; i++) {
              sb.append("\n  ");
              sb.append(i);
              sb.append(": ");
              sb.append(values.get(i).toHuman());
          }
  
          return sb.toString();
      }
  }
  