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.RegisterSpec;
  import com.taobao.android.dx.rop.code.RegisterSpecList;
  import com.taobao.android.dx.rop.code.RegisterSpecSet;
  import com.taobao.android.dx.rop.code.SourcePosition;
  import com.taobao.android.dx.ssa.RegisterMapper;
  
  /**
   * Pseudo-instruction which is used to hold a snapshot of the
   * state of local variable name mappings that exists immediately after
   * the instance in an instruction array.
   */
  public final class LocalSnapshot extends ZeroSizeInsn {
      /** {@code non-null;} local state associated with this instance */
      private final RegisterSpecSet locals;
  
      /**
       * Constructs an instance. The output address of this instance is initially
       * unknown ({@code -1}).
       *
       * @param position {@code non-null;} source position
       * @param locals {@code non-null;} associated local variable state
       */
      public LocalSnapshot(SourcePosition position, RegisterSpecSet locals) {
          super(position);
  
          if (locals == null) {
              throw new NullPointerException("locals == null");
          }
  
          this.locals = locals;
      }
  
      /** {@inheritDoc} */
      @Override
      public DalvInsn withRegisterOffset(int delta) {
          return new LocalSnapshot(getPosition(), locals.withOffset(delta));
      }
  
      /** {@inheritDoc} */
      @Override
      public DalvInsn withRegisters(RegisterSpecList registers) {
          return new LocalSnapshot(getPosition(), locals);
      }
  
      /**
       * Gets the local state associated with this instance.
       *
       * @return {@code non-null;} the state
       */
      public RegisterSpecSet getLocals() {
          return locals;
      }
  
      /** {@inheritDoc} */
      @Override
      protected String argString() {
          return locals.toString();
      }
  
      /** {@inheritDoc} */
      @Override
      protected String listingString0(boolean noteIndices) {
          int sz = locals.size();
          int max = locals.getMaxSize();
          StringBuffer sb = new StringBuffer(100 + sz * 40);
  
          sb.append("local-snapshot");
  
          for (int i = 0; i < max; i++) {
              RegisterSpec spec = locals.get(i);
              if (spec != null) {
                  sb.append("\n  ");
                  sb.append(LocalStart.localString(spec));
              }
          }
  
          return sb.toString();
      }
  
      /** {@inheritDoc} */
      @Override
      public DalvInsn withMapper(RegisterMapper mapper) {
        return new LocalSnapshot(getPosition(), mapper.map(locals));
      }
  }
  