src/llvm/include/llvm/DebugInfo/DWARFDebugRangeList.h

   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   /// getAbsoluteRanges - Returns absolute address ranges defined by this range
  70   /// list. Has to be passed base address of the compile unit referencing this
  71   /// range list.
  72   DWARFAddressRangesVector getAbsoluteRanges(uint64_t BaseAddress) const;
  73 };
  74
  75 }  // namespace llvm
  76
  77 #endif  // LLVM_DEBUGINFO_DWARFDEBUGRANGELIST_H