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  m :  namespace refinery {
  23    :  
  24  m :  SymbolProvider::SymbolProvider() {
  25  m :  }
  26    :  
  27  m :  SymbolProvider::~SymbolProvider() {
  28  m :  }
  29    :  
  30  m :  bool SymbolProvider::FindOrCreateTypeRepository(
  31  m :      const pe::PEFile::Signature& signature,
  32  m :      scoped_refptr<TypeRepository>* type_repo) {
  33  m :    DCHECK(type_repo);
  34  m :    *type_repo = nullptr;
  35    :  
  36  m :    base::string16 cache_key;
  37  m :    GetCacheKey(signature, &cache_key);
  38    :  
  39  m :    SimpleCache<TypeRepository>::LoadingCallback load_cb = base::Bind(
  40  m :        &SymbolProvider::CreateTypeRepository, base::Unretained(this), signature);
  41    :  
  42  m :    type_repos_.GetOrLoad(cache_key, load_cb, type_repo);
  43  m :    return type_repo->get() != nullptr;
  44  m :  }
  45    :  
  46  m :  bool SymbolProvider::FindOrCreateTypeNameIndex(
  47  m :      const pe::PEFile::Signature& signature,
  48  m :      scoped_refptr<TypeNameIndex>* typename_index) {
  49  m :    DCHECK(typename_index);
  50  m :    *typename_index = nullptr;
  51    :  
  52  m :    base::string16 cache_key;
  53  m :    GetCacheKey(signature, &cache_key);
  54    :  
  55  m :    SimpleCache<TypeNameIndex>::LoadingCallback load_cb = base::Bind(
  56  m :        &SymbolProvider::CreateTypeNameIndex, base::Unretained(this), signature);
  57    :  
  58  m :    typename_indices_.GetOrLoad(cache_key, load_cb, typename_index);
  59  m :    return typename_index->get() != nullptr;
  60  m :  }
  61    :  
  62  m :  bool SymbolProvider::GetVFTableRVAs(
  63  m :      const pe::PEFile::Signature& signature,
  64  m :      base::hash_set<RelativeAddress>* vftable_rvas) {
  65  m :    DCHECK(vftable_rvas);
  66  m :    vftable_rvas->clear();
  67    :  
  68  m :    base::FilePath pdb_path;
  69  m :    if (!GetPdbPath(signature, &pdb_path))
  70  m :      return false;
  71    :  
  72  m :    PdbCrawler crawler;
  73  m :    if (!crawler.InitializeForFile(pdb_path))
  74  m :      return false;
  75    :  
  76  m :    return crawler.GetVFTableRVAs(vftable_rvas);
  77  m :  }
  78    :  
  79  m :  void SymbolProvider::GetCacheKey(const pe::PEFile::Signature& signature,
  80  m :                                   base::string16* cache_key) {
  81  m :    DCHECK(cache_key);
  82    :    // Note that the cache key does not contain the module's base address.
  83  m :    base::SStringPrintf(cache_key, L"%ls:%d:%d:%d",
  84  m :                        base::FilePath(signature.path).BaseName().value().c_str(),
  85  m :                        signature.module_size, signature.module_checksum,
  86  m :                        signature.module_time_date_stamp);
  87  m :  }
  88    :  
  89  m :  bool SymbolProvider::CreateTypeRepository(
  90  m :      const pe::PEFile::Signature& signature,
  91  m :      scoped_refptr<TypeRepository>* type_repo) {
  92  m :    DCHECK(type_repo);
  93  m :    *type_repo = nullptr;
  94    :  
  95  m :    base::FilePath pdb_path;
  96  m :    if (!GetPdbPath(signature, &pdb_path))
  97  m :      return false;
  98    :  
  99  m :    scoped_refptr<TypeRepository> repository = new TypeRepository();
 100  m :    PdbCrawler crawler;
 101  m :    if (!crawler.InitializeForFile(pdb_path) ||
 102  m :        !crawler.GetTypes(repository.get())) {
 103  m :      return false;
 104  m :    }
 105    :  
 106  m :    *type_repo = repository;
 107  m :    return true;
 108  m :  }
 109    :  
 110  m :  bool SymbolProvider::CreateTypeNameIndex(const pe::PEFile::Signature& signature,
 111  m :                                           scoped_refptr<TypeNameIndex>* index) {
 112  m :    DCHECK(index);
 113    :  
 114  m :    scoped_refptr<TypeRepository> repository;
 115  m :    if (!FindOrCreateTypeRepository(signature, &repository))
 116  m :      return false;
 117    :  
 118  m :    *index = new TypeNameIndex(repository);
 119  m :    return true;
 120  m :  }
 121    :  
 122  m :  }  // namespace refinery