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      1 /*
      2  * Copyright (c) 2017 Facebook, Inc.
      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 namespace ebpf {
     17 
     18 class SourceDebugger {
     19  public:
     20   SourceDebugger(
     21       llvm::Module *mod,
     22       std::map<std::string, std::tuple<uint8_t *, uintptr_t>> &sections,
     23       const std::string &fn_prefix, const std::string &mod_src,
     24       std::map<std::string, std::string> &src_dbg_fmap)
     25       : mod_(mod),
     26         sections_(sections),
     27         fn_prefix_(fn_prefix),
     28         mod_src_(mod_src),
     29         src_dbg_fmap_(src_dbg_fmap) {}
     30 // Only support dump for llvm 6.x and later.
     31 //
     32 // The llvm 5.x, but not earlier versions, also supports create
     33 // a dwarf context for source debugging based
     34 // on a set of in-memory sections with slightly different interfaces.
     35 // FIXME: possibly to support 5.x
     36 //
     37 #if LLVM_MAJOR_VERSION >= 6
     38   void dump();
     39 
     40  private:
     41   void adjustInstSize(uint64_t &Size, uint8_t byte0, uint8_t byte1);
     42   std::vector<std::string> buildLineCache();
     43   void dumpSrcLine(const std::vector<std::string> &LineCache,
     44                    const std::string &FileName, uint32_t Line,
     45                    uint32_t &CurrentSrcLine, llvm::raw_ostream &os);
     46   void getDebugSections(
     47       llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> &DebugSections);
     48 #else
     49   void dump() {
     50   }
     51 #endif
     52 
     53  private:
     54   llvm::Module *mod_;
     55   const std::map<std::string, std::tuple<uint8_t *, uintptr_t>> &sections_;
     56   const std::string &fn_prefix_;
     57   const std::string &mod_src_;
     58   std::map<std::string, std::string> &src_dbg_fmap_;
     59 };
     60 
     61 }  // namespace ebpf
     62