[DWARF][NFC] NFC patch for reverted r342218 (refactoring rangelist handling)

[wolfgangp]

Summary

The purpose of this patch is not so much a review but to provide an NFC version of the patch that was submitted to create r342218. See the initial review in https://reviews.llvm.org/D51081.

The original patch caused TSan failures and this is an attempt to narrow down the cause.
Basically, the difference from the original patch is that it does not change any of the current format for dumping rangelists.
It is also rebased vs. Dave's latest patch supporting RLE_startx etc.

[JDevlieghere]

I only did a quick scan as it was reviewed before. Is there a particular area I should pay extra attention too? If not this LGTM.

include/llvm/DebugInfo/DWARF/DWARFListTable.h

164

Nit: Ctx?

[wolfgangp]

In D53545#1273281, @JDevlieghere wrote:

I only did a quick scan as it was reviewed before. Is there a particular area I should pay extra attention too? If not this LGTM.

Thanks, this was actually meant for Eric to see if it runs into the same TSan test issues as the previous patch.
@echristo Do you want me to commit this or can you take it separately?

[echristo]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

Trying to figure out a way around isDWO as a boolean argument and data member would be great.

[dblaikie]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

Avoiding it being a boolean, or avoiding having the same name for an argument and data member at the same time?

[echristo]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

The former. I'd like to avoid the boolean existing if we can avoid it, and definitely as an argument to the constructor as well.

[dblaikie]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

Ah, OK. In the "boolean arguments are hard to read" (eg: replace them with an enum) or the "this is extra state/information that this part of the code might, hopefully, not need to know"?

[wolfgangp]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

Yeah, it looks like it's always available from the context. If all goes well with this patch I'll try to do this as a follow-on if that's OK with you.

[dblaikie]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

Worth a shot - though one wrinkle: Support for non-split Split DWARF. I know the llvm-dwarfdump support for this is incomplete, but it's something to keep in mind - "isDWO" might not be a constant/globally true thing even for a single object file - it may contain both split and non-split content in the same file.

[wolfgangp]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

I had interpreted "isDWO" as something that derives from the section you're extracting from, i.e. when extracting a table from either .debug_rnglists or .debug_rnglists.dwo, so we should be able to treat the presence of the non-split content orthogonally, hopefully.

[probinson]

llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFListTable.h

165 ↗

(On Diff #171588)

My impression is that "isDWO" generally guides how to interpret cross-section references, so references from debug_foo.dwo would go to debug_bar.dwo instead of debug_bar. The dumper and verifier don't do cross-file stuff?
The debugger would though... so in the interest of converging the LLVM and LLDB readers, we might want to upgrade the bool to a 3-value enum at some point.

include/llvm/DebugInfo/DWARF/DWARFContext.h

public:
   DWARFCompileUnit *getDWOCompileUnitForHash(uint64_t Hash);
 
   /// Return the compile unit that includes an offset (relative to .debug_info).
   DWARFCompileUnit *getCompileUnitForOffset(uint32_t Offset);
 
   /// Get a DIE given an exact offset.
   DWARFDie getDIEForOffset(uint32_t Offset);
 
-  unsigned getMaxVersion() {
+  unsigned getMaxVersion(uint16_t DefaultVersion = 0) {
     // Ensure info units have been parsed to discover MaxVersion
     info_section_units();
-    return MaxVersion;
+    return MaxVersion ? MaxVersion : DefaultVersion;
   }
 
-  unsigned getMaxDWOVersion() {
+  unsigned getMaxDWOVersion(uint16_t DefaultVersion = 0) {
     // Ensure DWO info units have been parsed to discover MaxVersion
     dwo_info_section_units();
-    return MaxVersion;
+    return MaxVersion ? MaxVersion : DefaultVersion;
   }
 
   void setMaxVersionIfGreater(unsigned Version) {
     if (Version > MaxVersion)
       MaxVersion = Version;
   }
 
   const DWARFUnitIndex &getCUIndex();

include/llvm/DebugInfo/DWARF/DWARFDebugRangeList.h

-//===- DWARFDebugRangeList.h ------------------------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_DEBUGINFO_DWARF_DWARFDEBUGRANGELIST_H
-#define LLVM_DEBUGINFO_DWARF_DWARFDEBUGRANGELIST_H
-
-#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
-#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
-#include <cassert>
-#include <cstdint>
-#include <vector>
-
-namespace llvm {
-
-class raw_ostream;
-
-class DWARFDebugRangeList {
-public:
-  struct RangeListEntry {
-    /// A beginning address offset. This address offset has the size of an
-    /// address and is relative to the applicable base address of the
-    /// compilation unit referencing this range list. It marks the beginning
-    /// of an address range.
-    uint64_t StartAddress;
-    /// An ending address offset. This address offset again has the size of
-    /// an address and is relative to the applicable base address of the
-    /// compilation unit referencing this range list. It marks the first
-    /// address past the end of the address range. The ending address must
-    /// be greater than or equal to the beginning address.
-    uint64_t EndAddress;
-    /// A section index this range belongs to.
-    uint64_t SectionIndex;
-
-    /// The end of any given range list is marked by an end of list entry,
-    /// which consists of a 0 for the beginning address offset
-    /// and a 0 for the ending address offset.
-    bool isEndOfListEntry() const {
-      return (StartAddress == 0) && (EndAddress == 0);
-    }
-
-    /// A base address selection entry consists of:
-    /// 1. The value of the largest representable address offset
-    /// (for example, 0xffffffff when the size of an address is 32 bits).
-    /// 2. An address, which defines the appropriate base address for
-    /// use in interpreting the beginning and ending address offsets of
-    /// subsequent entries of the location list.
-    bool isBaseAddressSelectionEntry(uint8_t AddressSize) const {
-      assert(AddressSize == 4 || AddressSize == 8);
-      if (AddressSize == 4)
-        return StartAddress == -1U;
-      else
-        return StartAddress == -1ULL;
-    }
-  };
-
-private:
-  /// Offset in .debug_ranges section.
-  uint32_t Offset;
-  uint8_t AddressSize;
-  std::vector<RangeListEntry> Entries;
-
-public:
-  DWARFDebugRangeList() { clear(); }
-
-  void clear();
-  void dump(raw_ostream &OS) const;
-  Error extract(const DWARFDataExtractor &data, uint32_t *offset_ptr);
-  const std::vector<RangeListEntry> &getEntries() { return Entries; }
-
-  /// getAbsoluteRanges - Returns absolute address ranges defined by this range
-  /// list. Has to be passed base address of the compile unit referencing this
-  /// range list.
-  DWARFAddressRangesVector
-  getAbsoluteRanges(llvm::Optional<SectionedAddress> BaseAddr) const;
-};
-
-} // end namespace llvm
-
-#endif // LLVM_DEBUGINFO_DWARF_DWARFDEBUGRANGELIST_H

include/llvm/DebugInfo/DWARF/DWARFDebugRnglists.h

 //===- DWARFDebugRnglists.h -------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_DEBUGINFO_DWARFDEBUGRNGLISTS_H
 #define LLVM_DEBUGINFO_DWARFDEBUGRNGLISTS_H
 
 #include "llvm/ADT/Optional.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/DebugInfo/DIContext.h"
+#include "llvm/DebugInfo/DWARF/DWARFAddressRange.h"
 #include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
 #include "llvm/DebugInfo/DWARF/DWARFListTable.h"
 #include <cstdint>
 #include <map>
 #include <vector>
 
 namespace llvm {
 
+struct BaseAddress;
+class DWARFContext;
 class Error;
 class raw_ostream;
 class DWARFUnit;
 
 /// A class representing a single range list entry.
 struct RangeListEntry : public DWARFListEntryBase {
   /// The values making up the range list entry. Most represent a range with
   /// a start and end address or a start address and a length. Others are
   /// single value base addresses or end-of-list with no values. The unneeded
   /// values are semantically undefined, but initialized to 0.
   uint64_t Value0;
   uint64_t Value1;
 
-  Error extract(DWARFDataExtractor Data, uint32_t End, uint32_t *OffsetPtr);
-  void dump(raw_ostream &OS, uint8_t AddrSize, uint8_t MaxEncodingStringLength,
-            uint64_t &CurrentBase, DIDumpOptions DumpOpts,
+  Error extract(DWARFDataExtractor Data, uint32_t End, uint16_t Version,
+                StringRef SectionName, uint32_t *OffsetPtr, bool isDWO = false);
+  bool isEndOfList() const { return EntryKind == dwarf::DW_RLE_end_of_list; }
+  bool isBaseAddressSelectionEntry() const {
+    return EntryKind == dwarf::DW_RLE_base_address;
+  }
+  uint64_t getStartAddress() const {
+    assert((EntryKind == dwarf::DW_RLE_start_end ||
+            EntryKind == dwarf::DW_RLE_offset_pair ||
+            EntryKind == dwarf::DW_RLE_startx_length) &&
+           "Unexpected range list entry kind");
+    return Value0;
+  }
+  uint64_t getEndAddress() const {
+    assert((EntryKind == dwarf::DW_RLE_start_end ||
+            EntryKind == dwarf::DW_RLE_offset_pair) &&
+           "Unexpected range list entry kind");
+    return Value1;
+  }
+  void dump(raw_ostream &OS, DWARFContext *C, uint8_t AddrSize,
+            uint64_t &CurrentBase, unsigned Indent, uint16_t Version,
+            uint8_t MaxEncodingStringLength, DIDumpOptions DumpOpts,
             llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
                 LookupPooledAddress) const;
-  bool isSentinel() const { return EntryKind == dwarf::DW_RLE_end_of_list; }
 };
 
 /// A class representing a single rangelist.
 class DWARFDebugRnglist : public DWARFListType<RangeListEntry> {
 public:
   /// Build a DWARFAddressRangesVector from a rangelist.
   DWARFAddressRangesVector
   getAbsoluteRanges(llvm::Optional<SectionedAddress> BaseAddr,
                     DWARFUnit &U) const;
 };
 
 class DWARFDebugRnglistTable : public DWARFListTableBase<DWARFDebugRnglist> {
 public:
-  DWARFDebugRnglistTable()
-      : DWARFListTableBase(/* SectionName    = */ ".debug_rnglists",
+  DWARFDebugRnglistTable(DWARFContext *C, StringRef SectionName,
+                         bool isDWO = false)
+      : DWARFListTableBase(C, SectionName, isDWO,
                            /* HeaderString   = */ "ranges:",
-                           /* ListTypeString = */ "range") {}
+                           /* ListTypeString = */ "range",
+                           dwarf::RangeListEncodingString) {}
 };
 
 } // end namespace llvm
 
 #endif // LLVM_DEBUGINFO_DWARFDEBUGRNGLISTS_H

include/llvm/DebugInfo/DWARF/DWARFListTable.h

 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstdint>
 #include <map>
 #include <vector>
 
 namespace llvm {
 
+class DWARFContext;
+
 /// A base class for DWARF list entries, such as range or location list
 /// entries.
 struct DWARFListEntryBase {
   /// The offset at which the entry is located in the section.
   uint32_t Offset;
   /// The DWARF encoding (DW_RLE_* or DW_LLE_*).
   uint8_t EntryKind;
   /// The index of the section this entry belongs to.
   uint64_t SectionIndex;
 };
 
 /// A base class for lists of entries that are extracted from a particular
 /// section, such as range lists or location lists.
 template <typename ListEntryType> class DWARFListType {
+public:
   using EntryType = ListEntryType;
   using ListEntries = std::vector<EntryType>;
 
 protected:
   ListEntries Entries;
 
 public:
   const ListEntries &getEntries() const { return Entries; }
-  bool empty() const { return Entries.empty(); }
+  bool empty() const {
+    return Entries.empty() || Entries.begin()->isEndOfList();
+  }
   void clear() { Entries.clear(); }
+  uint32_t getOffset() const {
+    if (Entries.empty())
+      return 0;
+    return Entries.begin()->Offset;
+  }
+
+  /// Extract a list. The caller must pass the correct DWARF version.
+  /// The end-of-list entry is retained as the last element of the vector of
+  /// entries.
   Error extract(DWARFDataExtractor Data, uint32_t HeaderOffset, uint32_t End,
-                uint32_t *OffsetPtr, StringRef SectionName,
-                StringRef ListStringName);
+                uint16_t Version, uint32_t *OffsetPtr, StringRef SectionName,
+                StringRef ListStringName, bool isDWO = false);
+  void dump(raw_ostream &OS, DWARFContext *C, uint8_t AddressSize,
+            uint64_t BaseAddress, unsigned Indent, uint16_t Version,
+            size_t MaxEncodingStringLength, DIDumpOptions DumpOpts,
+            llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
+                LookupPooledAddress) const;
 };
 
 /// A class representing the header of a list table such as the range list
 /// table in the .debug_rnglists section.
 class DWARFListTableHeader {
   struct Header {
     /// The total length of the entries for this table, not including the length
     /// field itself.
     uint32_t Length = 0;
     /// The DWARF version number.
     uint16_t Version;
     /// The size in bytes of an address on the target architecture. For
     /// segmented addressing, this is the size of the offset portion of the
     /// address.
     uint8_t AddrSize;
     /// The size in bytes of a segment selector on the target architecture.
     /// If the target system uses a flat address space, this value is 0.
-    uint8_t SegSize;
+    uint8_t SegSize = 0;
     /// The number of offsets that follow the header before the range lists.
-    uint32_t OffsetEntryCount;
+    uint32_t OffsetEntryCount = 0;
   };
 
   Header HeaderData;
   /// The offset table, which contains offsets to the individual list entries.
   /// It is used by forms such as DW_FORM_rnglistx.
   /// FIXME: Generate the table and use the appropriate forms.
   std::vector<uint32_t> Offsets;
   /// The table's format, either DWARF32 or DWARF64.
-  dwarf::DwarfFormat Format;
+  dwarf::DwarfFormat Format = dwarf::DwarfFormat::DWARF32;
   /// The offset at which the header (and hence the table) is located within
   /// its section.
-  uint32_t HeaderOffset;
+  uint32_t HeaderOffset = 0;
   /// The name of the section the list is located in.
   StringRef SectionName;
   /// A characterization of the list for dumping purposes, e.g. "range" or
   /// "location".
   StringRef ListTypeString;
 
 public:
   DWARFListTableHeader(StringRef SectionName, StringRef ListTypeString)
       : SectionName(SectionName), ListTypeString(ListTypeString) {}
 
   void clear() {
     HeaderData = {};
     Offsets.clear();
   }
   uint32_t getHeaderOffset() const { return HeaderOffset; }
+
   uint8_t getAddrSize() const { return HeaderData.AddrSize; }
+  void setAddrSize(uint8_t AddrSize) { HeaderData.AddrSize = AddrSize; }
+
   uint32_t getLength() const { return HeaderData.Length; }
+  void setLength(uint32_t Length) { HeaderData.Length = Length; }
+
+  uint16_t getVersion() const { return HeaderData.Version; }
+  void setVersion(uint16_t Version) { HeaderData.Version = Version; }
+
+  uint8_t getSegSize() const { return HeaderData.SegSize; }
+  uint32_t getOffsetEntryCount() const { return HeaderData.OffsetEntryCount; }
+
   StringRef getSectionName() const { return SectionName; }
   StringRef getListTypeString() const { return ListTypeString; }
   dwarf::DwarfFormat getFormat() const { return Format; }
 
   void dump(raw_ostream &OS, DIDumpOptions DumpOpts = {}) const;
   Optional<uint32_t> getOffsetEntry(uint32_t Index) const {
     if (Index < Offsets.size())
       return Offsets[Index];
     return None;
   }
 
   /// Extract the table header and the array of offsets.
   Error extract(DWARFDataExtractor Data, uint32_t *OffsetPtr);
 
   /// Returns the length of the table, including the length field, or 0 if the
   /// length has not been determined (e.g. because the table has not yet been
-  /// parsed, or there was a problem in parsing).
-  uint32_t length() const;
+  /// parsed, or there was a problem in parsing). In fake tables, such as for
+  /// DWARF v4 and earlier, there is no header, so the length simply reflects
+  /// the size of the section.
+  uint32_t getTableLength() const;
 };
 
 /// A class representing a table of lists as specified in the DWARF v5
 /// standard for location lists and range lists. The table consists of a header
 /// followed by an array of offsets into a DWARF section, followed by zero or
 /// more list entries. The list entries are kept in a map where the keys are
 /// the lists' section offsets.
 template <typename DWARFListType> class DWARFListTableBase {
   DWARFListTableHeader Header;
   /// A mapping between file offsets and lists. It is used to find a particular
   /// list based on an offset (obtained from DW_AT_ranges, for example).
   std::map<uint32_t, DWARFListType> ListMap;
+  DWARFContext *C;
+  /// True if this list is located in a split-DWARF (dwo or dwp) file.
+  bool isDWO;
   /// This string is displayed as a heading before the list is dumped
   /// (e.g. "ranges:").
   StringRef HeaderString;
+  /// A function returning the encoding string for a given list entry encoding,
+  /// e.g. "DW_RLE_start_end".
+  std::function<StringRef(unsigned)> EncodingString;
 
 protected:
-  DWARFListTableBase(StringRef SectionName, StringRef HeaderString,
-                     StringRef ListTypeString)
-      : Header(SectionName, ListTypeString), HeaderString(HeaderString) {}
+  DWARFListTableBase(DWARFContext *C, StringRef SectionName, bool isDWO,
+                     StringRef HeaderString, StringRef ListTypeString,
+                     std::function<StringRef(unsigned)> EncodingString)
+      : Header(SectionName, ListTypeString), C(C), isDWO(isDWO),
+        HeaderString(HeaderString), EncodingString(EncodingString) {}
 
 public:
   void clear() {
     Header.clear();
     ListMap.clear();
   }
   /// Extract the table header and the array of offsets.
   Error extractHeaderAndOffsets(DWARFDataExtractor Data, uint32_t *OffsetPtr) {
     return Header.extract(Data, OffsetPtr);
   }
+
+  /// Initialize the table header to explicit values. This is used for DWARF v4
+  /// and earlier since there is no header that can be extracted from a section.
+  void setHeaderData(uint32_t Length, uint16_t Version, uint8_t AddrSize) {
+    assert(Header.getSegSize() == 0 &&
+           "Unexpected segsize in list table header.");
+    assert(Header.getOffsetEntryCount() == 0 &&
+           "Unexpected offset entry count in list table header.");
+    Header.setLength(Length);
+    Header.setVersion(Version);
+    Header.setAddrSize(AddrSize);
+  }
+
   /// Extract an entire table, including all list entries.
-  Error extract(DWARFDataExtractor Data, uint32_t *OffsetPtr);
+  Error extract(DWARFDataExtractor Data, uint16_t Version, uint32_t *OffsetPtr);
   /// Look up a list based on a given offset. Extract it and enter it into the
   /// list map if necessary.
   Expected<DWARFListType> findList(DWARFDataExtractor Data, uint32_t Offset);
 
   uint32_t getHeaderOffset() const { return Header.getHeaderOffset(); }
   uint8_t getAddrSize() const { return Header.getAddrSize(); }
+  StringRef getListTypeString() const { return Header.getListTypeString(); }
 
   void dump(raw_ostream &OS,
             llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
                 LookupPooledAddress,
             DIDumpOptions DumpOpts = {}) const;
 
   /// Return the contents of the offset entry designated by a given index.
   Optional<uint32_t> getOffsetEntry(uint32_t Index) const {
     return Header.getOffsetEntry(Index);
   }
   /// Return the size of the table header including the length but not including
   /// the offsets. This is dependent on the table format, which is unambiguously
   /// derived from parsing the table.
   uint8_t getHeaderSize() const {
     switch (Header.getFormat()) {
     case dwarf::DwarfFormat::DWARF32:
       return 12;
     case dwarf::DwarfFormat::DWARF64:
       return 20;
     }
     llvm_unreachable("Invalid DWARF format (expected DWARF32 or DWARF64");
   }
 
-  uint32_t length() { return Header.length(); }
+  uint16_t getVersion() const { return Header.getVersion(); }
+  uint32_t getLength() const { return Header.getTableLength(); }
 };
 
 template <typename DWARFListType>
 Error DWARFListTableBase<DWARFListType>::extract(DWARFDataExtractor Data,
+                                                 uint16_t Version,
                                                  uint32_t *OffsetPtr) {
+  assert(Version > 0 && "DWARF version required and not given.");
   clear();
-  if (Error E = extractHeaderAndOffsets(Data, OffsetPtr))
+  // For DWARF v4 and earlier, we cannot extract a table header, so we
+  // initialize it explicitly.
+  if (Version < 5)
+    setHeaderData(Data.size(), Version, Data.getAddressSize());
+  else if (Error E = extractHeaderAndOffsets(Data, OffsetPtr))
     return E;
 
   Data.setAddressSize(Header.getAddrSize());
-  uint32_t End = getHeaderOffset() + Header.length();
+  uint32_t End = getHeaderOffset() + getLength();
+  // Extract all lists.
   while (*OffsetPtr < End) {
     DWARFListType CurrentList;
     uint32_t Off = *OffsetPtr;
-    if (Error E = CurrentList.extract(Data, getHeaderOffset(), End, OffsetPtr,
-                                      Header.getSectionName(),
-                                      Header.getListTypeString()))
+    if (Error E = CurrentList.extract(
+            Data, getHeaderOffset(), End, Header.getVersion(), OffsetPtr,
+            Header.getSectionName(), Header.getListTypeString(), isDWO)) {
+      *OffsetPtr = End;
       return E;
+    }
     ListMap[Off] = CurrentList;
   }
 
   assert(*OffsetPtr == End &&
          "mismatch between expected length of table and length "
          "of extracted data");
   return Error::success();
 }
 
 template <typename ListEntryType>
-Error DWARFListType<ListEntryType>::extract(DWARFDataExtractor Data,
-                                            uint32_t HeaderOffset, uint32_t End,
-                                            uint32_t *OffsetPtr,
-                                            StringRef SectionName,
-                                            StringRef ListTypeString) {
+Error DWARFListType<ListEntryType>::extract(
+    DWARFDataExtractor Data, uint32_t HeaderOffset, uint32_t End,
+    uint16_t Version, uint32_t *OffsetPtr, StringRef SectionName,
+    StringRef ListTypeString, bool isDWO) {
   if (*OffsetPtr < HeaderOffset || *OffsetPtr >= End)
     return createStringError(errc::invalid_argument,
                        "invalid %s list offset 0x%" PRIx32,
                        ListTypeString.data(), *OffsetPtr);
   Entries.clear();
+  uint32_t StartingOffset = *OffsetPtr;
   while (*OffsetPtr < End) {
     ListEntryType Entry;
-    if (Error E = Entry.extract(Data, End, OffsetPtr))
+    if (Error E =
+            Entry.extract(Data, End, Version, SectionName, OffsetPtr, isDWO))
       return E;
+    if (Version < 5)
+      Entry.Offset = StartingOffset;
     Entries.push_back(Entry);
-    if (Entry.isSentinel())
+    if (Entry.isEndOfList())
       return Error::success();
   }
   return createStringError(errc::illegal_byte_sequence,
                      "no end of list marker detected at end of %s table "
                      "starting at offset 0x%" PRIx32,
                      SectionName.data(), HeaderOffset);
 }
 
+template <typename ListEntryType>
+void DWARFListType<ListEntryType>::dump(
+    raw_ostream &OS, DWARFContext *C, uint8_t AddressSize, uint64_t BaseAddress,
+    unsigned Indent, uint16_t Version, size_t MaxEncodingStringLength,
+    DIDumpOptions DumpOpts,
+    llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
+        LookupPooledAddress) const {
+  uint64_t CurrentBase = BaseAddress;
+  for (const auto &Entry : Entries)
+    Entry.dump(OS, C, AddressSize, CurrentBase, Indent, Version,
+               MaxEncodingStringLength, DumpOpts, LookupPooledAddress);
+}
+
 template <typename DWARFListType>
 void DWARFListTableBase<DWARFListType>::dump(
     raw_ostream &OS,
     llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
         LookupPooledAddress,
     DIDumpOptions DumpOpts) const {
-  Header.dump(OS, DumpOpts);
-  OS << HeaderString << "\n";
-
   // Determine the length of the longest encoding string we have in the table,
   // so we can align the output properly. We only need this in verbose mode.
   size_t MaxEncodingStringLength = 0;
-  if (DumpOpts.Verbose) {
+  // Don't dump the fake table header we create for DWARF v4 and earlier.
+  if (Header.getVersion() > 4) {
+    Header.dump(OS, DumpOpts);
+    OS << HeaderString << '\n';
+    // Determine the length of the longest encoding string we have in the table,
+    // so we can align the output properly. We only need this in verbose mode.
+    if (DumpOpts.Verbose)
       for (const auto &List : ListMap)
         for (const auto &Entry : List.second.getEntries())
-        MaxEncodingStringLength =
-            std::max(MaxEncodingStringLength,
-                     dwarf::RangeListEncodingString(Entry.EntryKind).size());
+          MaxEncodingStringLength = std::max(
+              MaxEncodingStringLength, EncodingString(Entry.EntryKind).size());
   }
 
   uint64_t CurrentBase = 0;
   for (const auto &List : ListMap)
-    for (const auto &Entry : List.second.getEntries())
-      Entry.dump(OS, getAddrSize(), MaxEncodingStringLength, CurrentBase,
-                 DumpOpts, LookupPooledAddress);
+    List.second.dump(OS, C, getAddrSize(), CurrentBase, 0, Header.getVersion(),
+                     MaxEncodingStringLength, DumpOpts, LookupPooledAddress);
 }
 
 template <typename DWARFListType>
 Expected<DWARFListType>
 DWARFListTableBase<DWARFListType>::findList(DWARFDataExtractor Data,
                                             uint32_t Offset) {
   auto Entry = ListMap.find(Offset);
   if (Entry != ListMap.end())
     return Entry->second;
 
   // Extract the list from the section and enter it into the list map.
   DWARFListType List;
-  uint32_t End = getHeaderOffset() + Header.length();
+  uint32_t End = getHeaderOffset() + getLength();
   uint32_t StartingOffset = Offset;
-  if (Error E =
-          List.extract(Data, getHeaderOffset(), End, &Offset,
-                       Header.getSectionName(), Header.getListTypeString()))
+  if (Error E = List.extract(Data, getHeaderOffset(), End, Header.getVersion(),
+                             &Offset, Header.getSectionName(),
+                             Header.getListTypeString(), isDWO))
     return std::move(E);
   ListMap[StartingOffset] = List;
   return List;
 }
 
 } // end namespace llvm
 
 #endif // LLVM_DEBUGINFO_DWARFLISTTABLE_H

include/llvm/DebugInfo/DWARF/DWARFUnit.h

 
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
 #include "llvm/DebugInfo/DWARF/DWARFDie.h"
 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
 #include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
 #include "llvm/DebugInfo/DWARF/DWARFSection.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
 #include "llvm/Support/DataExtractor.h"
 #include <algorithm>
public:
   bool getStringOffsetSectionItem(uint32_t Index, uint64_t &Result) const;
 
   DWARFDataExtractor getDebugInfoExtractor() const;
 
   DataExtractor getStringExtractor() const {
     return DataExtractor(StringSection, false, 0);
   }
 
-  /// Extract the range list referenced by this compile unit from the
-  /// .debug_ranges section. If the extraction is unsuccessful, an error
-  /// is returned. Successful extraction requires that the compile unit
-  /// has already been extracted.
-  Error extractRangeList(uint32_t RangeListOffset,
-                         DWARFDebugRangeList &RangeList) const;
   void clear();
 
   const Optional<StrOffsetsContributionDescriptor> &
   getStringOffsetsTableContribution() const {
     return StringOffsetsTableContribution;
   }
 
   uint8_t getDwarfStringOffsetsByteSize() const {

lib/DebugInfo/DWARF/CMakeLists.txt

add_llvm_library(LLVMDebugInfoDWARF
   DWARFDebugArangeSet.cpp
   DWARFDebugAranges.cpp
   DWARFDebugFrame.cpp
   DWARFDebugInfoEntry.cpp
   DWARFDebugLine.cpp
   DWARFDebugLoc.cpp
   DWARFDebugMacro.cpp
   DWARFDebugPubTable.cpp
-  DWARFDebugRangeList.cpp
   DWARFDebugRnglists.cpp
   DWARFDie.cpp
   DWARFExpression.cpp
   DWARFFormValue.cpp
   DWARFGdbIndex.cpp
   DWARFListTable.cpp
   DWARFTypeUnit.cpp
   DWARFUnitIndex.cpp
   DWARFUnit.cpp
   DWARFVerifier.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/DebugInfo/DWARF
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/DebugInfo
   )

lib/DebugInfo/DWARF/DWARFContext.cpp

 #include "llvm/DebugInfo/DWARF/DWARFDebugAddr.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugAranges.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugLoc.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
 #include "llvm/DebugInfo/DWARF/DWARFDie.h"
 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
 #include "llvm/DebugInfo/DWARF/DWARFGdbIndex.h"
 #include "llvm/DebugInfo/DWARF/DWARFSection.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h"
 #include "llvm/DebugInfo/DWARF/DWARFVerifier.h"
 #include "llvm/MC/MCRegisterInfo.h"
if (Error Err = AddrTable.extract(AddrData, &Offset, Version, AddrSize,
       uint64_t Length = AddrTable.getLength();
       Offset = TableOffset + Length;
     } else {
       AddrTable.dump(OS, DumpOpts);
     }
   }
 }
 
-// Dump the .debug_rnglists or .debug_rnglists.dwo section (DWARF v5).
+// Dump a section that contains a sequence of tables of lists, such as range
+// or location list tables. In DWARF v5 we expect to find properly formatted
+// tables with headers. In DWARF v4 and earlier we simply expect a sequence of
+// lists, which we treat, mutatis mutandis, like DWARF v5 tables.
+template <typename ListTable>
 static void
-dumpRnglistsSection(raw_ostream &OS, DWARFDataExtractor &rnglistData,
-                    llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
-                        LookupPooledAddress,
-                    DIDumpOptions DumpOpts) {
+dumpListSection(raw_ostream &OS, DWARFContext *C, StringRef SectionName,
+                uint16_t MaxVersion, DWARFDataExtractor &ListData,
+                DIDumpOptions DumpOpts, bool isDWO = false) {
   uint32_t Offset = 0;
-  while (rnglistData.isValidOffset(Offset)) {
-    llvm::DWARFDebugRnglistTable Rnglists;
-    uint32_t TableOffset = Offset;
-    if (Error Err = Rnglists.extract(rnglistData, &Offset)) {
+  while (ListData.isValidOffset(Offset)) {
+    ListTable Table(C, SectionName, isDWO);
+    if (Error Err = Table.extract(ListData, MaxVersion, &Offset)) {
       WithColor::error() << toString(std::move(Err)) << '\n';
-      uint64_t Length = Rnglists.length();
-      // Keep going after an error, if we can, assuming that the length field
-      // could be read. If it couldn't, stop reading the section.
-      if (Length == 0)
+      // If table extraction set Offset to 0, it indicates that we cannot
+      // continue to read the section.
+      if (Offset == 0)
         break;
-      Offset = TableOffset + Length;
+      // In DWARF v4 and earlier, dump as much of the lists as we can.
+      if (MaxVersion < 5)
+        Table.dump(OS, LookupPooledAddress, DumpOpts);
     } else {
-      Rnglists.dump(OS, LookupPooledAddress, DumpOpts);
+      Table.dump(OS, LookupPooledAddress, DumpOpts);
     }
   }
 }
 
 static void dumpLoclistsSection(raw_ostream &OS, DIDumpOptions DumpOpts,
                                 DWARFDataExtractor Data,
                                 const MCRegisterInfo *MRI,
                                 Optional<uint64_t> DumpOffset) {
void DWARFContext::dump(
 
   if (shouldDump(Explicit, ".debug_addr", DIDT_ID_DebugAddr,
                  DObj->getAddrSection().Data)) {
     DWARFDataExtractor AddrData(*DObj, DObj->getAddrSection(),
                                    isLittleEndian(), 0);
     dumpAddrSection(OS, AddrData, DumpOpts, getMaxVersion(), getCUAddrSize());
   }
 
-  if (shouldDump(Explicit, ".debug_ranges", DIDT_ID_DebugRanges,
-                 DObj->getRangeSection().Data)) {
-    uint8_t savedAddressByteSize = getCUAddrSize();
-    DWARFDataExtractor rangesData(*DObj, DObj->getRangeSection(),
-                                  isLittleEndian(), savedAddressByteSize);
-    uint32_t offset = 0;
-    DWARFDebugRangeList rangeList;
-    while (rangesData.isValidOffset(offset)) {
-      if (Error E = rangeList.extract(rangesData, &offset)) {
-        WithColor::error() << toString(std::move(E)) << '\n';
-        break;
-      }
-      rangeList.dump(OS);
-    }
-  }
-
   auto LookupPooledAddress = [&](uint32_t Index) -> Optional<SectionedAddress> {
     const auto &CUs = compile_units();
     auto I = CUs.begin();
     if (I == CUs.end())
       return None;
     return (*I)->getAddrOffsetSectionItem(Index);
   };
 
+  if (shouldDump(Explicit, ".debug_ranges", DIDT_ID_DebugRanges,
+                 DObj->getRangeSection().Data)) {
+    uint8_t savedAddressByteSize = getCUAddrSize();
+    DWARFDataExtractor rangesData(*DObj, DObj->getRangeSection(),
+                                  isLittleEndian(), savedAddressByteSize);
+    dumpListSection<DWARFDebugRnglistTable>(OS, this, ".debug_ranges",
+                                            /* MaxVersion = */ 4, rangesData,
+                                            LookupPooledAddress, DumpOpts);
+  }
+
   if (shouldDump(Explicit, ".debug_rnglists", DIDT_ID_DebugRnglists,
                  DObj->getRnglistsSection().Data)) {
     DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsSection(),
-                                   isLittleEndian(), 0);
-    dumpRnglistsSection(OS, RnglistData, LookupPooledAddress, DumpOpts);
+                                   isLittleEndian(), getCUAddrSize());
+    dumpListSection<DWARFDebugRnglistTable>(OS, this, ".debug_rnglists",
+                                            getMaxVersion(5), RnglistData,
+                                            LookupPooledAddress, DumpOpts);
   }
 
   if (shouldDump(ExplicitDWO, ".debug_rnglists.dwo", DIDT_ID_DebugRnglists,
                  DObj->getRnglistsDWOSection().Data)) {
     DWARFDataExtractor RnglistData(*DObj, DObj->getRnglistsDWOSection(),
-                                   isLittleEndian(), 0);
-    dumpRnglistsSection(OS, RnglistData, LookupPooledAddress, DumpOpts);
+                                   isLittleEndian(), getCUAddrSize());
+    dumpListSection<DWARFDebugRnglistTable>(OS, this, ".debug_rnglists.dwo",
+                                            getMaxVersion(5), RnglistData,
+                                            LookupPooledAddress, DumpOpts);
   }
 
   if (shouldDump(Explicit, ".debug_pubnames", DIDT_ID_DebugPubnames,
                  DObj->getPubNamesSection()))
     DWARFDebugPubTable(DObj->getPubNamesSection(), isLittleEndian(), false)
         .dump(OS);
 
   if (shouldDump(Explicit, ".debug_pubtypes", DIDT_ID_DebugPubtypes,

lib/DebugInfo/DWARF/DWARFDebugRangeList.cpp

-//===- DWARFDebugRangesList.cpp -------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
-#include "llvm/DebugInfo/DWARF/DWARFContext.h"
-#include "llvm/Support/Errc.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cinttypes>
-#include <cstdint>
-
-using namespace llvm;
-
-void DWARFDebugRangeList::clear() {
-  Offset = -1U;
-  AddressSize = 0;
-  Entries.clear();
-}
-
-Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
-                                   uint32_t *offset_ptr) {
-  clear();
-  if (!data.isValidOffset(*offset_ptr))
-    return createStringError(errc::invalid_argument,
-                       "invalid range list offset 0x%" PRIx32, *offset_ptr);
-
-  AddressSize = data.getAddressSize();
-  if (AddressSize != 4 && AddressSize != 8)
-    return createStringError(errc::invalid_argument,
-                       "invalid address size: %" PRIu8, AddressSize);
-  Offset = *offset_ptr;
-  while (true) {
-    RangeListEntry Entry;
-    Entry.SectionIndex = -1ULL;
-
-    uint32_t prev_offset = *offset_ptr;
-    Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
-    Entry.EndAddress =
-        data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
-
-    // Check that both values were extracted correctly.
-    if (*offset_ptr != prev_offset + 2 * AddressSize) {
-      clear();
-      return createStringError(errc::invalid_argument,
-                         "invalid range list entry at offset 0x%" PRIx32,
-                         prev_offset);
-    }
-    if (Entry.isEndOfListEntry())
-      break;
-    Entries.push_back(Entry);
-  }
-  return Error::success();
-}
-
-void DWARFDebugRangeList::dump(raw_ostream &OS) const {
-  for (const RangeListEntry &RLE : Entries) {
-    const char *format_str = (AddressSize == 4
-                              ? "%08x %08"  PRIx64 " %08"  PRIx64 "\n"
-                              : "%08x %016" PRIx64 " %016" PRIx64 "\n");
-    OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
-  }
-  OS << format("%08x <End of list>\n", Offset);
-}
-
-DWARFAddressRangesVector DWARFDebugRangeList::getAbsoluteRanges(
-    llvm::Optional<SectionedAddress> BaseAddr) const {
-  DWARFAddressRangesVector Res;
-  for (const RangeListEntry &RLE : Entries) {
-    if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
-      BaseAddr = {RLE.EndAddress, RLE.SectionIndex};
-      continue;
-    }
-
-    DWARFAddressRange E;
-    E.LowPC = RLE.StartAddress;
-    E.HighPC = RLE.EndAddress;
-    E.SectionIndex = RLE.SectionIndex;
-    // Base address of a range list entry is determined by the closest preceding
-    // base address selection entry in the same range list. It defaults to the
-    // base address of the compilation unit if there is no such entry.
-    if (BaseAddr) {
-      E.LowPC += BaseAddr->Address;
-      E.HighPC += BaseAddr->Address;
-      if (E.SectionIndex == -1ULL)
-        E.SectionIndex = BaseAddr->SectionIndex;
-    }
-    Res.push_back(E);
-  }
-  return Res;
-}

lib/DebugInfo/DWARF/DWARFDebugRnglists.cpp

 //===- DWARFDebugRnglists.cpp ---------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Format.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
 Error RangeListEntry::extract(DWARFDataExtractor Data, uint32_t End,
-                              uint32_t *OffsetPtr) {
+                              uint16_t Version, StringRef /* SectionName */,
+                              uint32_t *OffsetPtr, bool /* isDWO */) {
   Offset = *OffsetPtr;
   SectionIndex = -1ULL;
+
+  assert((Data.getAddressSize() == 4 || Data.getAddressSize() == 8) &&
+         "Unsupported address size");
+
+  // We model a DWARF v4 range list entry like DWARF v5 DW_RLE_offset_pair,
+  // since it is subject to base adjustment.
+  uint8_t Encoding = dwarf::DW_RLE_offset_pair;
+  if (Version > 4) {
     // The caller should guarantee that we have at least 1 byte available, so
     // we just assert instead of revalidate.
     assert(*OffsetPtr < End &&
            "not enough space to extract a rangelist encoding");
-  uint8_t Encoding = Data.getU8(OffsetPtr);
+    Encoding = Data.getU8(OffsetPtr);
+  }
 
   switch (Encoding) {
   case dwarf::DW_RLE_end_of_list:
     Value0 = Value1 = 0;
     break;
   // TODO: Support other encodings.
   case dwarf::DW_RLE_base_addressx: {
     uint32_t PreviousOffset = *OffsetPtr - 1;
if (End < *OffsetPtr)
       return createStringError(
           errc::invalid_argument,
           "read past end of table when reading "
           "DW_RLE_startx_length encoding at offset 0x%" PRIx32,
           PreviousOffset);
     break;
   }
   case dwarf::DW_RLE_offset_pair: {
+    if (Version < 5) {
+      if ((End - *OffsetPtr) < unsigned(Data.getAddressSize() * 2))
+        return createStringError(
+            errc::illegal_byte_sequence,
+            "invalid range list entry at offset 0x%" PRIx32, *OffsetPtr);
+      Value0 = Data.getRelocatedAddress(OffsetPtr);
+      Value1 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
+      // Adjust the EntryKind for end-of-list and base_address based on the
+      // contents.
+      if (Value0 == maxUIntN(Data.getAddressSize() * 8)) {
+        Encoding = dwarf::DW_RLE_base_address;
+        Value0 = Value1;
+        Value1 = 0;
+      } else if (Value0 == 0 && Value1 == 0)
+        Encoding = dwarf::DW_RLE_end_of_list;
+      break;
+    }
     uint32_t PreviousOffset = *OffsetPtr - 1;
     Value0 = Data.getULEB128(OffsetPtr);
     Value1 = Data.getULEB128(OffsetPtr);
     if (End < *OffsetPtr)
       return createStringError(errc::invalid_argument,
                          "read past end of table when reading "
                          "DW_RLE_offset_pair encoding at offset 0x%" PRIx32,
                          PreviousOffset);
     break;
   }
-  case dwarf::DW_RLE_base_address: {
+  case dwarf::DW_RLE_base_address:
     if ((End - *OffsetPtr) < Data.getAddressSize())
       return createStringError(errc::invalid_argument,
                          "insufficient space remaining in table for "
                          "DW_RLE_base_address encoding at offset 0x%" PRIx32,
                          *OffsetPtr - 1);
     Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
     break;
-  }
-  case dwarf::DW_RLE_start_end: {
+  case dwarf::DW_RLE_start_end:
     if ((End - *OffsetPtr) < unsigned(Data.getAddressSize() * 2))
       return createStringError(errc::invalid_argument,
                          "insufficient space remaining in table for "
                          "DW_RLE_start_end encoding "
                          "at offset 0x%" PRIx32,
                          *OffsetPtr - 1);
-    Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
-    Value1 = Data.getRelocatedAddress(OffsetPtr);
+    Value0 = Data.getRelocatedAddress(OffsetPtr);
+    Value1 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
     break;
-  }
   case dwarf::DW_RLE_start_length: {
     uint32_t PreviousOffset = *OffsetPtr - 1;
     Value0 = Data.getRelocatedAddress(OffsetPtr, &SectionIndex);
     Value1 = Data.getULEB128(OffsetPtr);
     if (End < *OffsetPtr)
       return createStringError(errc::invalid_argument,
                          "read past end of table when reading "
                          "DW_RLE_start_length encoding at offset 0x%" PRIx32,
default:
       llvm_unreachable("Unsupported range list encoding");
     }
     Res.push_back(E);
   }
   return Res;
 }
 
 void RangeListEntry::dump(
-    raw_ostream &OS, uint8_t AddrSize, uint8_t MaxEncodingStringLength,
-    uint64_t &CurrentBase, DIDumpOptions DumpOpts,
+    raw_ostream &OS, DWARFContext *, uint8_t AddrSize, uint64_t &CurrentBase,
+    unsigned Indent, uint16_t Version, uint8_t MaxEncodingStringLength,
+    DIDumpOptions DumpOpts,
     llvm::function_ref<Optional<SectionedAddress>(uint32_t)>
         LookupPooledAddress) const {
   auto PrintRawEntry = [](raw_ostream &OS, const RangeListEntry &Entry,
                           uint8_t AddrSize, DIDumpOptions DumpOpts) {
     if (DumpOpts.Verbose) {
       DumpOpts.DisplayRawContents = true;
       DWARFAddressRange(Entry.Value0, Entry.Value1)
           .dump(OS, AddrSize, DumpOpts);
       OS << " => ";
     }
   };
 
+  // Output indentations before we print the actual entry. We only print
+  // anything for DW_RLE_base_address when we are in verbose mode.
+  if (Version < 5 || DumpOpts.Verbose || !isBaseAddressSelectionEntry())
+    OS.indent(Indent);
+
+  // Always print the section offset in DWARF v4 and earlier.
+  if (Version < 5) {
+    OS << format("%08x", Offset);
+    DumpOpts.Verbose = false;
+  }
+
   if (DumpOpts.Verbose) {
     // Print the section offset in verbose mode.
     OS << format("0x%8.8" PRIx32 ":", Offset);
+    if (Version > 4) {
       auto EncodingString = dwarf::RangeListEncodingString(EntryKind);
       // Unsupported encodings should have been reported during parsing.
       assert(!EncodingString.empty() && "Unknown range entry encoding");
       OS << format(" [%s%*c", EncodingString.data(),
                    MaxEncodingStringLength - EncodingString.size() + 1, ']');
-    if (EntryKind != dwarf::DW_RLE_end_of_list)
+      if (!isEndOfList())
         OS << ": ";
     }
+  }
 
   switch (EntryKind) {
   case dwarf::DW_RLE_end_of_list:
-    OS << (DumpOpts.Verbose ? "" : "<End of list>");
+    OS << (DumpOpts.Verbose ? "" : " <End of list>");
     break;
     //  case dwarf::DW_RLE_base_addressx:
   case dwarf::DW_RLE_base_addressx: {
     if (auto SA = LookupPooledAddress(Value0))
       CurrentBase = SA->Address;
     else
       CurrentBase = Value0;
     if (!DumpOpts.Verbose)
       return;
     OS << format(" 0x%*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
     break;
   }
   case dwarf::DW_RLE_base_address:
-    // In non-verbose mode we do not print anything for this entry.
+    // In non-verbose mode, we do not print anything for this entry.
     CurrentBase = Value0;
+    if (Version < 5) {
+      // Dump the entry in pre-DWARF v5 format, i.e. with a -1 as Value0.
+      uint64_t allOnes = maxUIntN(AddrSize * 8);
+      OS << format(" %*.*" PRIx64, AddrSize * 2, AddrSize * 2, allOnes);
+      OS << format(" %*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
+      break;
+    }
     if (!DumpOpts.Verbose)
       return;
     OS << format(" 0x%*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
     break;
   case dwarf::DW_RLE_start_length:
     PrintRawEntry(OS, *this, AddrSize, DumpOpts);
     DWARFAddressRange(Value0, Value0 + Value1).dump(OS, AddrSize, DumpOpts);
     break;
   case dwarf::DW_RLE_offset_pair:
+    if (Version < 5) {
+      OS << format(" %*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value0);
+      OS << format(" %*.*" PRIx64, AddrSize * 2, AddrSize * 2, Value1);
+      break;
+    }
     PrintRawEntry(OS, *this, AddrSize, DumpOpts);
     DWARFAddressRange(Value0 + CurrentBase, Value1 + CurrentBase)
         .dump(OS, AddrSize, DumpOpts);
     break;
   case dwarf::DW_RLE_start_end:
     DWARFAddressRange(Value0, Value1).dump(OS, AddrSize, DumpOpts);
     break;
   case dwarf::DW_RLE_startx_length: {

lib/DebugInfo/DWARF/DWARFDie.cpp

 #include "llvm/DebugInfo/DWARF/DWARFDie.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
 #include "llvm/DebugInfo/DWARF/DWARFExpression.h"
 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/DataExtractor.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MathExtras.h"

lib/DebugInfo/DWARF/DWARFListTable.cpp

 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
 Error DWARFListTableHeader::extract(DWARFDataExtractor Data,
                                     uint32_t *OffsetPtr) {
   HeaderOffset = *OffsetPtr;
   // Read and verify the length field.
-  if (!Data.isValidOffsetForDataOfSize(*OffsetPtr, sizeof(uint32_t)))
+  if (!Data.isValidOffsetForDataOfSize(*OffsetPtr, sizeof(uint32_t))) {
+    // By setting *OffsetPtr to 0, we indicate to the caller that
+    // we could not detemine the length of the table.
+    *OffsetPtr = 0;
     return createStringError(errc::invalid_argument,
                              "section is not large enough to contain a "
                              "%s table length at offset 0x%" PRIx32,
-                       SectionName.data(), *OffsetPtr);
+                             SectionName.data(), HeaderOffset);
+  }
   // TODO: Add support for DWARF64.
   HeaderData.Length = Data.getU32(OffsetPtr);
-  if (HeaderData.Length == 0xffffffffu)
+  if (HeaderData.Length == 0xffffffffu) {
+    *OffsetPtr = 0;
     return createStringError(errc::not_supported,
                        "DWARF64 is not supported in %s at offset 0x%" PRIx32,
                        SectionName.data(), HeaderOffset);
+  }
+
+  uint32_t TableLength = HeaderData.Length + sizeof(uint32_t);
+  uint32_t End = HeaderOffset + TableLength;
   Format = dwarf::DwarfFormat::DWARF32;
-  if (HeaderData.Length + sizeof(uint32_t) < sizeof(Header))
+  if (TableLength < sizeof(Header)) {
+    *OffsetPtr = End;
     return createStringError(errc::invalid_argument,
                              "%s table at offset 0x%" PRIx32
                              " has too small length (0x%" PRIx32
                              ") to contain a complete header",
-                       SectionName.data(), HeaderOffset, length());
-  uint32_t End = HeaderOffset + length();
-  if (!Data.isValidOffsetForDataOfSize(HeaderOffset, End - HeaderOffset))
-    return createStringError(errc::invalid_argument,
-                       "section is not large enough to contain a %s table "
-                       "of length 0x%" PRIx32 " at offset 0x%" PRIx32,
-                       SectionName.data(), length(), HeaderOffset);
+                             SectionName.data(), HeaderOffset, TableLength);
+  }
+  if (!Data.isValidOffsetForDataOfSize(HeaderOffset, TableLength)) {
+    *OffsetPtr = 0; // No recovery if the length exceeds the section size.
+    return createStringError(
+        errc::invalid_argument,
+        SectionName.data(), TableLength, HeaderOffset);
+  }
 
   HeaderData.Version = Data.getU16(OffsetPtr);
   HeaderData.AddrSize = Data.getU8(OffsetPtr);
   HeaderData.SegSize = Data.getU8(OffsetPtr);
   HeaderData.OffsetEntryCount = Data.getU32(OffsetPtr);
 
   // Perform basic validation of the remaining header fields.
-  if (HeaderData.Version != 5)
+  if (HeaderData.Version != 5) {
+    *OffsetPtr = End;
     return createStringError(errc::invalid_argument,
                              "unrecognised %s table version %" PRIu16
                              " in table at offset 0x%" PRIx32,
-                       SectionName.data(), HeaderData.Version, HeaderOffset);
-  if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8)
+                             SectionName.data(), HeaderData.Version,
+                             HeaderOffset);
+  }
+  if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8) {
+    *OffsetPtr = End;
     return createStringError(errc::not_supported,
                        "%s table at offset 0x%" PRIx32
                        " has unsupported address size %" PRIu8,
                        SectionName.data(), HeaderOffset, HeaderData.AddrSize);
-  if (HeaderData.SegSize != 0)
+  }
+  if (HeaderData.SegSize != 0) {
+    *OffsetPtr = End;
     return createStringError(errc::not_supported,
                        "%s table at offset 0x%" PRIx32
                        " has unsupported segment selector size %" PRIu8,
                        SectionName.data(), HeaderOffset, HeaderData.SegSize);
+  }
   if (End < HeaderOffset + sizeof(HeaderData) +
-                HeaderData.OffsetEntryCount * sizeof(uint32_t))
+                HeaderData.OffsetEntryCount * sizeof(uint32_t)) {
+    *OffsetPtr = End;
     return createStringError(errc::invalid_argument,
         "%s table at offset 0x%" PRIx32 " has more offset entries (%" PRIu32
         ") than there is space for",
         SectionName.data(), HeaderOffset, HeaderData.OffsetEntryCount);
+  }
   Data.setAddressSize(HeaderData.AddrSize);
   for (uint32_t I = 0; I < HeaderData.OffsetEntryCount; ++I)
     Offsets.push_back(Data.getU32(OffsetPtr));
   return Error::success();
 }
 
 void DWARFListTableHeader::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
   if (DumpOpts.Verbose)
for (const auto &Off : Offsets) {
       if (DumpOpts.Verbose)
         OS << format(" => 0x%8.8" PRIx32,
                      Off + HeaderOffset + sizeof(HeaderData));
     }
     OS << "\n]\n";
   }
 }
 
-uint32_t DWARFListTableHeader::length() const {
+uint32_t DWARFListTableHeader::getTableLength() const {
   if (HeaderData.Length == 0)
     return 0;
+  assert(HeaderData.Version > 0 &&
+         "No DWARF version in header when using getTableLength()");
   // TODO: DWARF64 support.
-  return HeaderData.Length + sizeof(uint32_t);
+  return HeaderData.Length + (HeaderData.Version > 4) * sizeof(uint32_t);
 }

lib/DebugInfo/DWARF/DWARFUnit.cpp

bool DWARFUnitHeader::extract(DWARFContext &Context,
   if (!LengthOK || !VersionOK || !AddrSizeOK || !TypeOffsetOK)
     return false;
 
   // Keep track of the highest DWARF version we encounter across all units.
   Context.setMaxVersionIfGreater(getVersion());
   return true;
 }
 
-// Parse the rangelist table header, including the optional array of offsets
+// Parse a list table header, including the optional array of offsets
 // following it (DWARF v5 and later).
-static Expected<DWARFDebugRnglistTable>
-parseRngListTableHeader(DWARFDataExtractor &DA, uint32_t Offset) {
+template <typename DWARFListTable>
+static Expected<DWARFListTable>
+parseListTableHeader(DWARFDataExtractor DA, DWARFContext *C,
+                     StringRef SectionName, uint32_t Offset, bool isDWO) {
   // TODO: Support DWARF64
   // We are expected to be called with Offset 0 or pointing just past the table
   // header, which is 12 bytes long for DWARF32.
+  DWARFListTable Table(C, SectionName, isDWO);
   if (Offset > 0) {
     if (Offset < 12U)
       return createStringError(errc::invalid_argument, "Did not detect a valid"
                                " range list table with base = 0x%" PRIu32,
                                Offset);
     Offset -= 12U;
   }
-  llvm::DWARFDebugRnglistTable Table;
   if (Error E = Table.extractHeaderAndOffsets(DA, &Offset))
     return std::move(E);
   return Table;
 }
 
-Error DWARFUnit::extractRangeList(uint32_t RangeListOffset,
-                                  DWARFDebugRangeList &RangeList) const {
-  // Require that compile unit is extracted.
-  assert(!DieArray.empty());
-  DWARFDataExtractor RangesData(Context.getDWARFObj(), *RangeSection,
-                                isLittleEndian, getAddressByteSize());
-  uint32_t ActualRangeListOffset = RangeSectionBase + RangeListOffset;
-  return RangeList.extract(RangesData, &ActualRangeListOffset);
+// Parse a DWARF v5 list table (e.g. either a rangelist table or a location
+// list table). For DWARF units with version 4 or earlier, we instead create
+// the table artifically by giving it a size that equals the section size.
+template <typename DWARFListTable>
+static Optional<DWARFListTable>
+setupListTable(DWARFUnit *U, const DWARFSection *Section, StringRef SectionName,
+               uint32_t &Base, bool isDWO, bool isLittleEndian) {
+  if (!Section->Data.size())
+    return None;
+  DWARFContext &Ctx = U->getContext();
+  DWARFListTable Table(&Ctx, SectionName, isDWO);
+  // Parse the list table header. Individual lists are extracted lazily.
+  DWARFDataExtractor DA(Ctx.getDWARFObj(), *Section, isLittleEndian,
+                        U->getAddressByteSize());
+  if (U->getVersion() < 5) {
+    Base = 0;
+    Table.setHeaderData(Section->Data.size(), U->getVersion(),
+                        DA.getAddressSize());
+    return Table;
+  }
+  if (auto TableOrError = parseListTableHeader<DWARFListTable>(
+          DA, &Ctx, SectionName, Base, isDWO))
+    Table = TableOrError.get();
+  else {
+    WithColor::error() << "parsing a " << Table.getListTypeString().data()
+                       << " list table: " << toString(TableOrError.takeError())
+                       << '\n';
+    return None;
+  }
+  // In a split dwarf unit, there are no attributes like DW_AT_rnglists_base or
+  // DW_AT_loclists_base that describe the table base. Adjust Base to point past
+  // the table header which is expected to start at offset 0.
+  if (isDWO)
+    Base = Table.getHeaderSize();
+  return Table;
 }
 
 void DWARFUnit::clear() {
   Abbrevs = nullptr;
   BaseAddr.reset();
   RangeSectionBase = 0;
   AddrOffsetSectionBase = 0;
   clearDIEs(false);
if (isDWO)
           determineStringOffsetsTableContributionDWO(
               DA, StringOffsetsContributionBase);
     else if (getVersion() >= 5)
       StringOffsetsTableContribution = determineStringOffsetsTableContribution(
           DA, StringOffsetsContributionBase);
 
     // DWARF v5 uses the .debug_rnglists and .debug_rnglists.dwo sections to
     // describe address ranges.
+    StringRef RangeSectionName = ".debug_ranges";
     if (getVersion() >= 5) {
-      if (isDWO)
+      if (isDWO) {
+        RangeSectionName = ".debug_rnglists.dwo";
         setRangesSection(&Context.getDWARFObj().getRnglistsDWOSection(), 0);
-      else
+      } else {
+        RangeSectionName = ".debug_rnglists";
         setRangesSection(&Context.getDWARFObj().getRnglistsSection(),
                          toSectionOffset(UnitDie.find(DW_AT_rnglists_base), 0));
-      if (RangeSection->Data.size()) {
-        // Parse the range list table header. Individual range lists are
-        // extracted lazily.
-        DWARFDataExtractor RangesDA(Context.getDWARFObj(), *RangeSection,
-                                    isLittleEndian, 0);
-        if (auto TableOrError =
-                parseRngListTableHeader(RangesDA, RangeSectionBase))
-          RngListTable = TableOrError.get();
-        else
-          WithColor::error() << "parsing a range list table: "
-                             << toString(TableOrError.takeError())
-                             << '\n';
-
-        // In a split dwarf unit, there is no DW_AT_rnglists_base attribute.
-        // Adjust RangeSectionBase to point past the table header.
-        if (isDWO && RngListTable)
-          RangeSectionBase = RngListTable->getHeaderSize();
       }
     }
+    RngListTable = setupListTable<DWARFDebugRnglistTable>(
+        this, RangeSection, RangeSectionName, RangeSectionBase, isDWO,
+        isLittleEndian);
 
     // Don't fall back to DW_AT_GNU_ranges_base: it should be ignored for
     // skeleton CU DIE, so that DWARF users not aware of it are not broken.
   }
 
   return DieArray.size();
 }
 
bool DWARFUnit::parseDWO() {
   DWARFCompileUnit *DWOCU = DWOContext->getDWOCompileUnitForHash(*DWOId);
   if (!DWOCU)
     return false;
   DWO = std::shared_ptr<DWARFCompileUnit>(std::move(DWOContext), DWOCU);
   // Share .debug_addr and .debug_ranges section with compile unit in .dwo
   DWO->setAddrOffsetSection(AddrOffsetSection, AddrOffsetSectionBase);
   if (getVersion() >= 5) {
     DWO->setRangesSection(&Context.getDWARFObj().getRnglistsDWOSection(), 0);
-    DWARFDataExtractor RangesDA(Context.getDWARFObj(), *RangeSection,
-                                isLittleEndian, 0);
-    if (auto TableOrError = parseRngListTableHeader(RangesDA, RangeSectionBase))
-      DWO->RngListTable = TableOrError.get();
-    else
-      WithColor::error() << "parsing a range list table: "
-                         << toString(TableOrError.takeError())
-                         << '\n';
-    if (DWO->RngListTable)
-      DWO->RangeSectionBase = DWO->RngListTable->getHeaderSize();
+    DWO->RngListTable = setupListTable<DWARFDebugRnglistTable>(
+        DWOCU, DWO->RangeSection, ".debug_rnglists.dwo", DWO->RangeSectionBase,
+        /* isDWO =*/true, isLittleEndian);
   } else {
     auto DWORangesBase = UnitDie.getRangesBaseAttribute();
     DWO->setRangesSection(RangeSection, DWORangesBase ? *DWORangesBase : 0);
   }
 
   return true;
 }
 
 void DWARFUnit::clearDIEs(bool KeepCUDie) {
   if (DieArray.size() > (unsigned)KeepCUDie) {
     DieArray.resize((unsigned)KeepCUDie);
     DieArray.shrink_to_fit();
   }
 }
 
 Expected<DWARFAddressRangesVector>
 DWARFUnit::findRnglistFromOffset(uint32_t Offset) {
-  if (getVersion() <= 4) {
-    DWARFDebugRangeList RangeList;
-    if (Error E = extractRangeList(Offset, RangeList))
-      return std::move(E);
-    return RangeList.getAbsoluteRanges(getBaseAddress());
-  }
   if (RngListTable) {
     DWARFDataExtractor RangesData(Context.getDWARFObj(), *RangeSection,
                                   isLittleEndian, RngListTable->getAddrSize());
     auto RangeListOrError = RngListTable->findList(RangesData, Offset);
     if (RangeListOrError)
       return RangeListOrError.get().getAbsoluteRanges(getBaseAddress(), *this);
     return RangeListOrError.takeError();
   }

tools/dsymutil/DwarfLinker.cpp

 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/DIE.h"
 #include "llvm/Config/config.h"
 #include "llvm/DebugInfo/DIContext.h"
 #include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
 #include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
 #include "llvm/DebugInfo/DWARF/DWARFDie.h"
 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
 #include "llvm/DebugInfo/DWARF/DWARFSection.h"
 #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"

 }
 
 /// Patch the input object file relevant debug_ranges entries
 /// and emit them in the output file. Update the relevant attributes
 /// to point at the new entries.
 void DwarfLinker::patchRangesForUnit(const CompileUnit &Unit,
                                      DWARFContext &OrigDwarf,
                                      const DebugMapObject &DMO) const {
-  DWARFDebugRangeList RangeList;
+  DWARFDebugRnglist RangeList;
   const auto &FunctionRanges = Unit.getFunctionRanges();
   unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
   DWARFDataExtractor RangeExtractor(OrigDwarf.getDWARFObj(),
                                     OrigDwarf.getDWARFObj().getRangeSection(),
                                     OrigDwarf.isLittleEndian(), AddressSize);
   auto InvalidRange = FunctionRanges.end(), CurrRange = InvalidRange;
   DWARFUnit &OrigUnit = Unit.getOrigUnit();
   auto OrigUnitDie = OrigUnit.getUnitDIE(false);
   uint64_t OrigLowPc =
       dwarf::toAddress(OrigUnitDie.find(dwarf::DW_AT_low_pc), -1ULL);
   // Ranges addresses are based on the unit's low_pc. Compute the
   // offset we need to apply to adapt to the new unit's low_pc.
   int64_t UnitPcOffset = 0;
   if (OrigLowPc != -1ULL)
     UnitPcOffset = int64_t(OrigLowPc) - Unit.getLowPc();
 
   for (const auto &RangeAttribute : Unit.getRangesAttributes()) {
     uint32_t Offset = RangeAttribute.get();
     RangeAttribute.set(Streamer->getRangesSectionSize());
-    if (Error E = RangeList.extract(RangeExtractor, &Offset)) {
+    if (Error E = RangeList.extract(RangeExtractor, /* HeaderOffset = */ 0,
+                                    RangeExtractor.size(),
+                                    Unit.getOrigUnit().getVersion(), &Offset,
+                                    ".debug_ranges", "range")) {
       llvm::consumeError(std::move(E));
       reportWarning("invalid range list ignored.", DMO);
       RangeList.clear();
     }
     const auto &Entries = RangeList.getEntries();
-    if (!Entries.empty()) {
-      const DWARFDebugRangeList::RangeListEntry &First = Entries.front();
-
+    if (!RangeList.empty()) {
+      const auto &First = Entries.front();
       if (CurrRange == InvalidRange ||
-          First.StartAddress + OrigLowPc < CurrRange.start() ||
-          First.StartAddress + OrigLowPc >= CurrRange.stop()) {
-        CurrRange = FunctionRanges.find(First.StartAddress + OrigLowPc);
+          First.getStartAddress() + OrigLowPc < CurrRange.start() ||
+          First.getStartAddress() + OrigLowPc >= CurrRange.stop()) {
+        CurrRange = FunctionRanges.find(First.getStartAddress() + OrigLowPc);
         if (CurrRange == InvalidRange ||
-            CurrRange.start() > First.StartAddress + OrigLowPc) {
+            CurrRange.start() > First.getStartAddress() + OrigLowPc) {
           reportWarning("no mapping for range.", DMO);
           continue;
         }
       }
     }
 
-    Streamer->emitRangesEntries(UnitPcOffset, OrigLowPc, CurrRange, Entries,
+    Streamer->emitRangesEntries(UnitPcOffset, OrigLowPc, CurrRange, RangeList,
                                 AddressSize);
   }
 }
 
 /// Generate the debug_aranges entries for \p Unit and if the
 /// unit has a DW_AT_ranges attribute, also emit the debug_ranges
 /// contribution for this attribute.
 /// FIXME: this could actually be done right in patchRangesForUnit,

tools/dsymutil/DwarfStreamer.h

 
 #include "CompileUnit.h"
 #include "DebugMap.h"
 #include "LinkUtils.h"
 #include "NonRelocatableStringpool.h"
 #include "llvm/CodeGen/AccelTable.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
-#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
+#include "llvm/DebugInfo/DWARF/DWARFDebugRnglists.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
public:
   /// Emit the string table described by \p Pool.
   void emitStrings(const NonRelocatableStringpool &Pool);
 
   /// Emit the swift_ast section stored in \p Buffer.
   void emitSwiftAST(StringRef Buffer);
 
   /// Emit debug_ranges for \p FuncRange by translating the
   /// original \p Entries.
-  void emitRangesEntries(
-      int64_t UnitPcOffset, uint64_t OrigLowPc,
+  void emitRangesEntries(int64_t UnitPcOffset, uint64_t OrigLowPc,
                          const FunctionIntervals::const_iterator &FuncRange,
-      const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
+                         const DWARFDebugRnglist &RangeList,
                          unsigned AddressSize);
 
   /// Emit debug_aranges entries for \p Unit and if \p DoRangesSection is true,
   /// also emit the debug_ranges entries for the DW_TAG_compile_unit's
   /// DW_AT_ranges attribute.
   void emitUnitRangesEntries(CompileUnit &Unit, bool DoRangesSection);
 
   uint32_t getRangesSectionSize() const { return RangesSectionSize; }
 

tools/dsymutil/DwarfStreamer.cpp

 
 /// Emit the debug_range section contents for \p FuncRange by
 /// translating the original \p Entries. The debug_range section
 /// format is totally trivial, consisting just of pairs of address
 /// sized addresses describing the ranges.
 void DwarfStreamer::emitRangesEntries(
     int64_t UnitPcOffset, uint64_t OrigLowPc,
     const FunctionIntervals::const_iterator &FuncRange,
-    const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
-    unsigned AddressSize) {
+    const DWARFDebugRnglist &RangeList, unsigned AddressSize) {
   MS->SwitchSection(MC->getObjectFileInfo()->getDwarfRangesSection());
 
   // Offset each range by the right amount.
-  int64_t PcOffset = Entries.empty() ? 0 : FuncRange.value() + UnitPcOffset;
-  for (const auto &Range : Entries) {
-    if (Range.isBaseAddressSelectionEntry(AddressSize)) {
+  int64_t PcOffset = RangeList.empty() ? 0 : FuncRange.value() + UnitPcOffset;
+  for (const auto &Range : RangeList.getEntries()) {
+    if (Range.isBaseAddressSelectionEntry()) {
       warn("unsupported base address selection operation",
            "emitting debug_ranges");
       break;
     }
     // Do not emit empty ranges.
-    if (Range.StartAddress == Range.EndAddress)
+    if (Range.isEndOfList() || Range.getStartAddress() == Range.getEndAddress())
       continue;
 
     // All range entries should lie in the function range.
-    if (!(Range.StartAddress + OrigLowPc >= FuncRange.start() &&
-          Range.EndAddress + OrigLowPc <= FuncRange.stop()))
+    if (!(Range.getStartAddress() + OrigLowPc >= FuncRange.start() &&
+          Range.getEndAddress() + OrigLowPc <= FuncRange.stop()))
       warn("inconsistent range data.", "emitting debug_ranges");
-    MS->EmitIntValue(Range.StartAddress + PcOffset, AddressSize);
-    MS->EmitIntValue(Range.EndAddress + PcOffset, AddressSize);
+    MS->EmitIntValue(Range.getStartAddress() + PcOffset, AddressSize);
+    MS->EmitIntValue(Range.getEndAddress() + PcOffset, AddressSize);
     RangesSectionSize += 2 * AddressSize;
   }
 
   // Add the terminator entry.
   MS->EmitIntValue(0, AddressSize);
   MS->EmitIntValue(0, AddressSize);
   RangesSectionSize += 2 * AddressSize;
 }