content: /*
   * Copyright (C) 2007 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.rop.code.BasicBlock;
  import com.taobao.android.dx.rop.code.BasicBlockList;
  import com.taobao.android.dx.rop.code.Insn;
  import com.taobao.android.dx.rop.code.RopMethod;
  import com.taobao.android.dx.rop.code.SourcePosition;
  
  /**
   * Container for the set of {@link CodeAddress} instances associated with
   * the blocks of a particular method. Each block has a corresponding
   * start address, end address, and last instruction address.
   */
  public final class BlockAddresses {
      /** {@code non-null;} array containing addresses for the start of each basic
       * block (indexed by basic block label) */
      private final CodeAddress[] starts;
  
      /** {@code non-null;} array containing addresses for the final instruction
       * of each basic block (indexed by basic block label) */
      private final CodeAddress[] lasts;
  
      /** {@code non-null;} array containing addresses for the end (just past the
       * final instruction) of each basic block (indexed by basic block
       * label) */
      private final CodeAddress[] ends;
  
      /**
       * Constructs an instance.
       *
       * @param method {@code non-null;} the method to have block addresses for
       */
      public BlockAddresses(RopMethod method) {
          BasicBlockList blocks = method.getBlocks();
          int maxLabel = blocks.getMaxLabel();
  
          this.starts = new CodeAddress[maxLabel];
          this.lasts = new CodeAddress[maxLabel];
          this.ends = new CodeAddress[maxLabel];
  
          setupArrays(method);
      }
  
      /**
       * Gets the instance for the start of the given block.
       *
       * @param block {@code non-null;} the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getStart(BasicBlock block) {
          return starts[block.getLabel()];
      }
  
      /**
       * Gets the instance for the start of the block with the given label.
       *
       * @param label {@code non-null;} the label of the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getStart(int label) {
          return starts[label];
      }
  
      /**
       * Gets the instance for the final instruction of the given block.
       *
       * @param block {@code non-null;} the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getLast(BasicBlock block) {
          return lasts[block.getLabel()];
      }
  
      /**
       * Gets the instance for the final instruction of the block with
       * the given label.
       *
       * @param label {@code non-null;} the label of the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getLast(int label) {
          return lasts[label];
      }
  
      /**
       * Gets the instance for the end (address after the final instruction)
       * of the given block.
       *
       * @param block {@code non-null;} the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getEnd(BasicBlock block) {
          return ends[block.getLabel()];
      }
  
      /**
       * Gets the instance for the end (address after the final instruction)
       * of the block with the given label.
       *
       * @param label {@code non-null;} the label of the block in question
       * @return {@code non-null;} the appropriate instance
       */
      public CodeAddress getEnd(int label) {
          return ends[label];
      }
  
      /**
       * Sets up the address arrays.
       */
      private void setupArrays(RopMethod method) {
          BasicBlockList blocks = method.getBlocks();
          int sz = blocks.size();
  
          for (int i = 0; i < sz; i++) {
              BasicBlock one = blocks.get(i);
              int label = one.getLabel();
              Insn insn = one.getInsns().get(0);
  
              starts[label] = new CodeAddress(insn.getPosition());
  
              SourcePosition pos = one.getLastInsn().getPosition();
  
              lasts[label] = new CodeAddress(pos);
              ends[label] = new CodeAddress(pos);
          }
      }
  }
  