79 lines · cpp
1//===- ExtractRanges.cpp ----------------------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "llvm/DebugInfo/GSYM/ExtractRanges.h"10#include "llvm/DebugInfo/GSYM/FileWriter.h"11#include "llvm/Support/DataExtractor.h"12#include <inttypes.h>13 14namespace llvm {15namespace gsym {16 17void encodeRange(const AddressRange &Range, FileWriter &O, uint64_t BaseAddr) {18 assert(Range.start() >= BaseAddr);19 O.writeULEB(Range.start() - BaseAddr);20 O.writeULEB(Range.size());21}22 23AddressRange decodeRange(DataExtractor &Data, uint64_t BaseAddr,24 uint64_t &Offset) {25 const uint64_t AddrOffset = Data.getULEB128(&Offset);26 const uint64_t Size = Data.getULEB128(&Offset);27 const uint64_t StartAddr = BaseAddr + AddrOffset;28 29 return {StartAddr, StartAddr + Size};30}31 32void encodeRanges(const AddressRanges &Ranges, FileWriter &O,33 uint64_t BaseAddr) {34 O.writeULEB(Ranges.size());35 if (Ranges.empty())36 return;37 for (auto Range : Ranges)38 encodeRange(Range, O, BaseAddr);39}40 41void decodeRanges(AddressRanges &Ranges, DataExtractor &Data, uint64_t BaseAddr,42 uint64_t &Offset) {43 Ranges.clear();44 uint64_t NumRanges = Data.getULEB128(&Offset);45 Ranges.reserve(NumRanges);46 for (uint64_t RangeIdx = 0; RangeIdx < NumRanges; RangeIdx++)47 Ranges.insert(decodeRange(Data, BaseAddr, Offset));48}49 50void skipRange(DataExtractor &Data, uint64_t &Offset) {51 Data.getULEB128(&Offset);52 Data.getULEB128(&Offset);53}54 55uint64_t skipRanges(DataExtractor &Data, uint64_t &Offset) {56 uint64_t NumRanges = Data.getULEB128(&Offset);57 for (uint64_t I = 0; I < NumRanges; ++I)58 skipRange(Data, Offset);59 return NumRanges;60}61 62} // namespace gsym63 64raw_ostream &operator<<(raw_ostream &OS, const AddressRange &R) {65 return OS << '[' << HEX64(R.start()) << " - " << HEX64(R.end()) << ")";66}67 68raw_ostream &operator<<(raw_ostream &OS, const AddressRanges &AR) {69 size_t Size = AR.size();70 for (size_t I = 0; I < Size; ++I) {71 if (I)72 OS << ' ';73 OS << AR[I];74 }75 return OS;76}77 78} // namespace llvm79