1    :  // Copyright 2013 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  //
  15    :  // Declares the COFF-specific transform policy object. This guides decisions
  16    :  // made during image decomposition, basic-block decomposition, transforms and
  17    :  // block building.
  18    :  
  19    :  #ifndef SYZYGY_PE_COFF_TRANSFORM_POLICY_H_
  20    :  #define SYZYGY_PE_COFF_TRANSFORM_POLICY_H_
  21    :  
  22    :  #include "syzygy/block_graph/transform_policy.h"
  23    :  #include "syzygy/pe/pe_transform_policy.h"
  24    :  
  25    :  namespace pe {
  26    :  
  27    :  // The interface that guides image and basic-block transform decisions for COFF
  28    :  // files.
  29    :  class CoffTransformPolicy : public block_graph::TransformPolicyInterface {
  30    :   public:
  31  E :    CoffTransformPolicy() { }
  32  E :    virtual ~CoffTransformPolicy() { }
  33    :  
  34    :    // @name TransformPolicyInterface implementation
  35    :    // @{
  36    :    virtual bool BlockIsSafeToBasicBlockDecompose(
  37    :        const BlockGraph::Block* block) const override;
  38    :    virtual bool ReferenceIsSafeToRedirect(
  39    :        const BlockGraph::Block* referrer,
  40    :        const BlockGraph::Reference& reference) const override;
  41    :    // @}
  42    :  
  43    :   private:
  44    :    // TODO(chrisha): For now we are only a thin wrapper around a PE transform
  45    :    //     policy. When the rest of the COFF machinery lands reimplement this to
  46    :    //     respect the differences between COFF and PE code blocks.
  47    :    PETransformPolicy pe_policy_;
  48    :  
  49    :    DISALLOW_COPY_AND_ASSIGN(CoffTransformPolicy);
  50    :  };
  51    :  
  52    :  }  // namespace pe
  53    :  
  54    :  #endif  // SYZYGY_PE_COFF_TRANSFORM_POLICY_H_