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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_MCCACHEREADER_H
     18 #define BCC_MCCACHEREADER_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 MCO_Header;
     32 
     33 namespace bcc {
     34   class FileHandle;
     35   class Script;
     36 
     37   class MCCacheReader {
     38   private:
     39     FileHandle *mObjFile, *mInfoFile;
     40     off_t mInfoFileSize;
     41 
     42     MCO_Header *mpHeader;
     43     OBCC_DependencyTable *mpCachedDependTable;
     44     OBCC_PragmaList *mpPragmaList;
     45     OBCC_FuncTable *mpFuncTable;
     46 
     47     OBCC_String_Ptr *mpVarNameList;
     48     OBCC_String_Ptr *mpFuncNameList;
     49 
     50     llvm::OwningPtr<ScriptCached> mpResult;
     51 
     52     std::map<std::string,
     53              std::pair<uint32_t, unsigned char const *> > mDependencies;
     54 
     55     bool mIsContextSlotNotAvail;
     56 
     57     BCCSymbolLookupFn mpSymbolLookupFn;
     58     void *mpSymbolLookupContext;
     59 
     60   public:
     61     MCCacheReader()
     62       : mObjFile(NULL), mInfoFile(NULL), mInfoFileSize(0), mpHeader(NULL),
     63         mpCachedDependTable(NULL), mpPragmaList(NULL),
     64         mpVarNameList(NULL), mpFuncNameList(NULL),
     65         mIsContextSlotNotAvail(false) {
     66     }
     67 
     68     ~MCCacheReader();
     69 
     70     void addDependency(OBCC_ResourceType resType,
     71                        std::string const &resName,
     72                        unsigned char const *sha1) {
     73       mDependencies.insert(std::make_pair(resName,
     74                            std::make_pair((uint32_t)resType, sha1)));
     75     }
     76 
     77     ScriptCached *readCacheFile(FileHandle *objFile, FileHandle *infoFile, Script *s);
     78     bool checkCacheFile(FileHandle *objFile, FileHandle *infoFile, Script *S);
     79 
     80     bool isContextSlotNotAvail() const {
     81       return mIsContextSlotNotAvail;
     82     }
     83 
     84     void registerSymbolCallback(BCCSymbolLookupFn pFn, void *pContext) {
     85       mpSymbolLookupFn = pFn;
     86       mpSymbolLookupContext = pContext;
     87     }
     88 
     89   private:
     90     bool readHeader();
     91     bool readStringPool();
     92     bool readDependencyTable();
     93     bool readPragmaList();
     94     bool readObjectSlotList();
     95     bool readObjFile();
     96     bool readRelocationTable();
     97 
     98     bool readVarNameList();
     99     bool readFuncNameList();
    100 
    101     bool checkFileSize();
    102     bool checkHeader();
    103     bool checkMachineIntType();
    104     bool checkSectionOffsetAndSize();
    105     bool checkStringPool();
    106     bool checkDependency();
    107     bool checkContext();
    108 
    109     bool relocate();
    110 
    111     static void *resolveSymbolAdapter(void *context, char const *name);
    112 
    113   };
    114 
    115 } // namespace bcc
    116 
    117 #endif // BCC_MCCACHEREADER_H
    118