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: SourceDebugger(llvm::Module * mod,std::map<std::string,std::tuple<uint8_t *,uintptr_t>> & sections,const std::string & fn_prefix,const std::string & mod_src,std::map<std::string,std::string> & src_dbg_fmap)20 SourceDebugger( 21 llvm::Module *mod, 22 std::map<std::string, std::tuple<uint8_t *, uintptr_t>> §ions, 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 dump()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>> §ions_; 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