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      1 /*
      2  * Copyright 2010, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef BCC_CACHEREADER_H
     18 #define BCC_CACHEREADER_H
     19 
     20 #include "ScriptCached.h"
     21 
     22 #include <llvm/ADT/OwningPtr.h>
     23 
     24 #include <map>
     25 #include <string>
     26 #include <utility>
     27 
     28 #include <stddef.h>
     29 #include <stdint.h>
     30 
     31 struct OBCC_Header;
     32 
     33 namespace bcc {
     34   class FileHandle;
     35   class Script;
     36 
     37   class CacheReader {
     38   private:
     39     FileHandle *mObjFile;
     40     FileHandle *mInfoFile;
     41     off_t mInfoFileSize;
     42 
     43     OBCC_Header *mpHeader;
     44     OBCC_DependencyTable *mpCachedDependTable;
     45     OBCC_PragmaList *mpPragmaList;
     46     OBCC_FuncTable *mpFuncTable;
     47 
     48     llvm::OwningPtr<ScriptCached> mpResult;
     49 
     50     std::map<std::string,
     51              std::pair<uint32_t, unsigned char const *> > mDependencies;
     52 
     53     bool mIsContextSlotNotAvail;
     54 
     55   public:
     56     CacheReader()
     57       : mObjFile(NULL), mInfoFile(NULL), mInfoFileSize(0), mpHeader(NULL),
     58         mpCachedDependTable(NULL), mpPragmaList(NULL), mpFuncTable(NULL),
     59         mIsContextSlotNotAvail(false) {
     60     }
     61 
     62     ~CacheReader();
     63 
     64     void addDependency(OBCC_ResourceType resType,
     65                        std::string const &resName,
     66                        unsigned char const *sha1) {
     67       mDependencies.insert(std::make_pair(resName,
     68                            std::make_pair((uint32_t)resType, sha1)));
     69     }
     70 
     71     ScriptCached *readCacheFile(FileHandle *objFile,
     72                                 FileHandle *infoFile,
     73                                 Script *s);
     74 
     75     bool isContextSlotNotAvail() const {
     76       return mIsContextSlotNotAvail;
     77     }
     78 
     79   private:
     80     bool readHeader();
     81     bool readStringPool();
     82     bool readDependencyTable();
     83     bool readExportVarList();
     84     bool readExportFuncList();
     85     bool readPragmaList();
     86     bool readFuncTable();
     87     bool readObjectSlotList();
     88     bool readContext();
     89     bool readRelocationTable();
     90 
     91     bool checkFileSize();
     92     bool checkHeader();
     93     bool checkMachineIntType();
     94     bool checkSectionOffsetAndSize();
     95     bool checkStringPool();
     96     bool checkDependency();
     97     bool checkContext();
     98 
     99     bool relocate();
    100   };
    101 
    102 } // namespace bcc
    103 
    104 #endif // BCC_CACHEREADER_H
    105