1 //===-- DWARFDebugRangeList.h -----------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_LIB_DEBUGINFO_DWARFDEBUGRANGELIST_H 11 #define LLVM_LIB_DEBUGINFO_DWARFDEBUGRANGELIST_H 12 13 #include "llvm/Support/DataExtractor.h" 14 #include <vector> 15 16 namespace llvm { 17 18 class raw_ostream; 19 20 /// DWARFAddressRangesVector - represents a set of absolute address ranges. 21 typedef std::vector<std::pair<uint64_t, uint64_t>> DWARFAddressRangesVector; 22 23 class DWARFDebugRangeList { 24 public: 25 struct RangeListEntry { 26 // A beginning address offset. This address offset has the size of an 27 // address and is relative to the applicable base address of the 28 // compilation unit referencing this range list. It marks the beginning 29 // of an address range. 30 uint64_t StartAddress; 31 // An ending address offset. This address offset again has the size of 32 // an address and is relative to the applicable base address of the 33 // compilation unit referencing this range list. It marks the first 34 // address past the end of the address range. The ending address must 35 // be greater than or equal to the beginning address. 36 uint64_t EndAddress; 37 // The end of any given range list is marked by an end of list entry, 38 // which consists of a 0 for the beginning address offset 39 // and a 0 for the ending address offset. 40 bool isEndOfListEntry() const { 41 return (StartAddress == 0) && (EndAddress == 0); 42 } 43 // A base address selection entry consists of: 44 // 1. The value of the largest representable address offset 45 // (for example, 0xffffffff when the size of an address is 32 bits). 46 // 2. An address, which defines the appropriate base address for 47 // use in interpreting the beginning and ending address offsets of 48 // subsequent entries of the location list. 49 bool isBaseAddressSelectionEntry(uint8_t AddressSize) const { 50 assert(AddressSize == 4 || AddressSize == 8); 51 if (AddressSize == 4) 52 return StartAddress == -1U; 53 else 54 return StartAddress == -1ULL; 55 } 56 }; 57 58 private: 59 // Offset in .debug_ranges section. 60 uint32_t Offset; 61 uint8_t AddressSize; 62 std::vector<RangeListEntry> Entries; 63 64 public: 65 DWARFDebugRangeList() { clear(); } 66 void clear(); 67 void dump(raw_ostream &OS) const; 68 bool extract(DataExtractor data, uint32_t *offset_ptr); 69 const std::vector<RangeListEntry> &getEntries() { return Entries; } 70 71 /// getAbsoluteRanges - Returns absolute address ranges defined by this range 72 /// list. Has to be passed base address of the compile unit referencing this 73 /// range list. 74 DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const; 75 }; 76 77 } // namespace llvm 78 79 #endif // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H 80
