1    :  // Copyright 2015 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    :  #include "syzygy/refinery/symbols/symbol_provider.h"
  16    :  
  17    :  #include "base/bind.h"
  18    :  #include "base/strings/stringprintf.h"
  19    :  #include "syzygy/refinery/symbols/symbol_provider_util.h"
  20    :  #include "syzygy/refinery/types/pdb_crawler.h"
  21    :  
  22    :  namespace refinery {
  23    :  
  24  E :  SymbolProvider::SymbolProvider() {
  25  E :  }
  26    :  
  27  E :  SymbolProvider::~SymbolProvider() {
  28  E :  }
  29    :  
  30    :  bool SymbolProvider::FindOrCreateTypeRepository(
  31    :      const pe::PEFile::Signature& signature,
  32  E :      scoped_refptr<TypeRepository>* type_repo) {
  33  E :    DCHECK(type_repo);
  34  E :    *type_repo = nullptr;
  35    :  
  36  E :    base::string16 cache_key;
  37  E :    GetCacheKey(signature, &cache_key);
  38    :  
  39    :    SimpleCache<TypeRepository>::LoadingCallback load_cb = base::Bind(
  40  E :        &SymbolProvider::CreateTypeRepository, base::Unretained(this), signature);
  41    :  
  42  E :    type_repos_.GetOrLoad(cache_key, load_cb, type_repo);
  43  E :    return type_repo->get() != nullptr;
  44  E :  }
  45    :  
  46    :  bool SymbolProvider::FindOrCreateTypeNameIndex(
  47    :      const pe::PEFile::Signature& signature,
  48  E :      scoped_refptr<TypeNameIndex>* typename_index) {
  49  E :    DCHECK(typename_index);
  50  E :    *typename_index = nullptr;
  51    :  
  52  E :    base::string16 cache_key;
  53  E :    GetCacheKey(signature, &cache_key);
  54    :  
  55    :    SimpleCache<TypeNameIndex>::LoadingCallback load_cb = base::Bind(
  56  E :        &SymbolProvider::CreateTypeNameIndex, base::Unretained(this), signature);
  57    :  
  58  E :    typename_indices_.GetOrLoad(cache_key, load_cb, typename_index);
  59  E :    return typename_index->get() != nullptr;
  60  E :  }
  61    :  
  62    :  void SymbolProvider::GetCacheKey(const pe::PEFile::Signature& signature,
  63  E :                                   base::string16* cache_key) {
  64  E :    DCHECK(cache_key);
  65    :    // Note that the cache key does not contain the module's base address.
  66    :    base::SStringPrintf(cache_key, L"%ls:%d:%d:%d",
  67    :                        base::FilePath(signature.path).BaseName().value().c_str(),
  68    :                        signature.module_size, signature.module_checksum,
  69  E :                        signature.module_time_date_stamp);
  70  E :  }
  71    :  
  72    :  bool SymbolProvider::CreateTypeRepository(
  73    :      const pe::PEFile::Signature& signature,
  74  E :      scoped_refptr<TypeRepository>* type_repo) {
  75  E :    DCHECK(type_repo);
  76  E :    *type_repo = nullptr;
  77    :  
  78  E :    base::FilePath pdb_path;
  79  E :    if (!GetPdbPath(signature, &pdb_path))
  80  i :      return false;
  81    :  
  82  E :    scoped_refptr<TypeRepository> repository = new TypeRepository();
  83  E :    PdbCrawler crawler;
  84    :    if (!crawler.InitializeForFile(pdb_path) ||
  85  E :        !crawler.GetTypes(repository.get())) {
  86  i :      return false;
  87    :    }
  88    :  
  89  E :    *type_repo = repository;
  90  E :    return true;
  91  E :  }
  92    :  
  93    :  bool SymbolProvider::CreateTypeNameIndex(const pe::PEFile::Signature& signature,
  94  E :                                           scoped_refptr<TypeNameIndex>* index) {
  95  E :    DCHECK(index);
  96    :  
  97  E :    scoped_refptr<TypeRepository> repository;
  98  E :    if (!FindOrCreateTypeRepository(signature, &repository))
  99  i :      return false;
 100    :  
 101  E :    *index = new TypeNameIndex(repository);
 102  E :    return true;
 103  E :  }
 104    :  
 105    :  }  // namespace refinery