Split GdbIndexBuilder class into non-member functions.

That class had three member functions, and all of them are just reader
methods that did not depend on class members, so they can be just non-
member functions.

Probably we should reorganize the functions themselves because their
return types doesn't make much sense to me, but for now I just moved
these functions out of the class.

llvm-svn: 296700

4 files changed, 85 insertions, 125 deletions

diff --git a/lld/ELF/GdbIndex.cpp b/lld/ELF/GdbIndex.cpp
index 0cb245cfaba..5cca07a328b 100644
--- a/lld/ELF/GdbIndex.cpp
+++ b/lld/ELF/GdbIndex.cpp
@@ -68,59 +68,6 @@ using namespace llvm::object;
 using namespace lld;
 using namespace lld::elf;
 
-class lld::elf::ObjInfoTy : public llvm::LoadedObjectInfo {
-  uint64_t getSectionLoadAddress(const object::SectionRef &Sec) const override {
-    auto &S = static_cast<const ELFSectionRef &>(Sec);
-    if (S.getFlags() & ELF::SHF_ALLOC)
-      return S.getOffset();
-    return 0;
-  }
-
-  std::unique_ptr<llvm::LoadedObjectInfo> clone() const override { return {}; }
-};
-
-template <class ELFT>
-GdbIndexBuilder<ELFT>::GdbIndexBuilder(InputSection *Sec)
-    : DebugInfoSec(Sec), ObjInfo(new ObjInfoTy) {
-  elf::ObjectFile<ELFT> *File = Sec->template getFile<ELFT>();
-  Expected<std::unique_ptr<object::ObjectFile>> Obj =
-      object::ObjectFile::createObjectFile(File->MB);
-
-  if (Obj)
-    Dwarf.reset(new DWARFContextInMemory(*Obj.get(), ObjInfo.get()));
-  else
-    error(toString(File) + ": error creating DWARF context");
-}
-
-template <class ELFT> GdbIndexBuilder<ELFT>::~GdbIndexBuilder() {}
-
-template <class ELFT>
-std::vector<std::pair<typename ELFT::uint, typename ELFT::uint>>
-GdbIndexBuilder<ELFT>::readCUList() {
-  std::vector<std::pair<uintX_t, uintX_t>> Ret;
-  for (std::unique_ptr<DWARFCompileUnit> &CU : Dwarf->compile_units())
-    Ret.push_back(
-        {DebugInfoSec->OutSecOff + CU->getOffset(), CU->getLength() + 4});
-  return Ret;
-}
-
-template <class ELFT>
-std::vector<std::pair<StringRef, uint8_t>>
-GdbIndexBuilder<ELFT>::readPubNamesAndTypes() {
-  const bool IsLE = ELFT::TargetEndianness == llvm::support::little;
-  StringRef Data[] = {Dwarf->getGnuPubNamesSection(),
-                      Dwarf->getGnuPubTypesSection()};
-
-  std::vector<std::pair<StringRef, uint8_t>> Ret;
-  for (StringRef D : Data) {
-    DWARFDebugPubTable PubTable(D, IsLE, true);
-    for (const DWARFDebugPubTable::Set &S : PubTable.getData())
-      for (const DWARFDebugPubTable::Entry &E : S.Entries)
-        Ret.push_back({E.Name, E.Descriptor.toBits()});
-  }
-  return Ret;
-}
-
 std::pair<bool, GdbSymbol *> GdbHashTab::add(uint32_t Hash, size_t Offset) {
   GdbSymbol *&Sym = Map[Offset];
   if (Sym)
@@ -149,38 +96,3 @@ void GdbHashTab::finalizeContents() {
     }
   }
 }
-
-template <class ELFT>
-static InputSectionBase *findSection(ArrayRef<InputSectionBase *> Arr,
-                                     uint64_t Offset) {
-  for (InputSectionBase *S : Arr)
-    if (S && S != &InputSection::Discarded)
-      if (Offset >= S->Offset && Offset < S->Offset + S->getSize<ELFT>())
-        return S;
-  return nullptr;
-}
-
-template <class ELFT>
-std::vector<AddressEntry<ELFT>>
-GdbIndexBuilder<ELFT>::readAddressArea(size_t CurrentCU) {
-  std::vector<AddressEntry<ELFT>> Ret;
-  for (std::unique_ptr<DWARFCompileUnit> &CU : Dwarf->compile_units()) {
-    DWARFAddressRangesVector Ranges;
-    CU->collectAddressRanges(Ranges);
-
-    ArrayRef<InputSectionBase *> Sections =
-        DebugInfoSec->template getFile<ELFT>()->getSections();
-
-    for (std::pair<uint64_t, uint64_t> &R : Ranges)
-      if (InputSectionBase *S = findSection<ELFT>(Sections, R.first))
-        Ret.push_back(
-            {S, R.first - S->Offset, R.second - S->Offset, CurrentCU});
-    ++CurrentCU;
-  }
-  return Ret;
-}
-
-template class elf::GdbIndexBuilder<ELF32LE>;
-template class elf::GdbIndexBuilder<ELF32BE>;
-template class elf::GdbIndexBuilder<ELF64LE>;
-template class elf::GdbIndexBuilder<ELF64BE>;
diff --git a/lld/ELF/GdbIndex.h b/lld/ELF/GdbIndex.h
index 351ac598b34..a36b92714de 100644
--- a/lld/ELF/GdbIndex.h
+++ b/lld/ELF/GdbIndex.h
@@ -18,42 +18,15 @@ namespace lld {
 namespace elf {
 
 class InputSection;
-class ObjInfoTy;
 
 // Struct represents single entry of address area of gdb index.
-template <class ELFT> struct AddressEntry {
+struct AddressEntry {
   InputSectionBase *Section;
   uint64_t LowAddress;
   uint64_t HighAddress;
   size_t CuIndex;
 };
 
-// GdbIndexBuilder is a helper class used for extracting data required
-// for building .gdb_index section from objects.
-template <class ELFT> class GdbIndexBuilder {
-  typedef typename ELFT::uint uintX_t;
-
-  InputSection *DebugInfoSec;
-  std::unique_ptr<llvm::DWARFContext> Dwarf;
-  std::unique_ptr<ObjInfoTy> ObjInfo;
-
-public:
-  GdbIndexBuilder(InputSection *DebugInfoSec);
-  ~GdbIndexBuilder();
-
-  // Extracts the compilation units. Each first element of pair is a offset of a
-  // CU in the .debug_info section and second is the length of that CU.
-  std::vector<std::pair<uintX_t, uintX_t>> readCUList();
-
-  // Extracts the vector of address area entries. Accepts global index of last
-  // parsed CU.
-  std::vector<AddressEntry<ELFT>> readAddressArea(size_t CurrentCU);
-
-  // Method extracts public names and types. It returns list of name and
-  // gnu_pub* kind pairs.
-  std::vector<std::pair<StringRef, uint8_t>> readPubNamesAndTypes();
-};
-
 // Element of GdbHashTab hash table.
 struct GdbSymbol {
   GdbSymbol(uint32_t Hash, size_t Offset)
diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index ddee17975af..08bfa78439a 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -27,6 +27,8 @@
 #include "Threads.h"
 #include "Writer.h"
 #include "lld/Config/Version.h"
+#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
+#include "llvm/Object/ELFObjectFile.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/MD5.h"
@@ -1702,20 +1704,93 @@ static uint32_t hash(StringRef Str) {
   return R;
 }
 
+static std::vector<std::pair<uint64_t, uint64_t>>
+readCuList(DWARFContext &Dwarf, InputSection *Sec) {
+  std::vector<std::pair<uint64_t, uint64_t>> Ret;
+  for (std::unique_ptr<DWARFCompileUnit> &CU : Dwarf.compile_units())
+    Ret.push_back({Sec->OutSecOff + CU->getOffset(), CU->getLength() + 4});
+  return Ret;
+}
+
+template <class ELFT>
+static InputSectionBase *findSection(ArrayRef<InputSectionBase *> Arr,
+                                     uint64_t Offset) {
+  for (InputSectionBase *S : Arr)
+    if (S && S != &InputSection::Discarded)
+      if (Offset >= S->Offset && Offset < S->Offset + S->getSize<ELFT>())
+        return S;
+  return nullptr;
+}
+
+template <class ELFT>
+static std::vector<AddressEntry>
+readAddressArea(DWARFContext &Dwarf, InputSection *Sec, size_t CurrentCU) {
+  std::vector<AddressEntry> Ret;
+
+  for (std::unique_ptr<DWARFCompileUnit> &CU : Dwarf.compile_units()) {
+    DWARFAddressRangesVector Ranges;
+    CU->collectAddressRanges(Ranges);
+
+    ArrayRef<InputSectionBase *> Sections =
+        Sec->template getFile<ELFT>()->getSections();
+
+    for (std::pair<uint64_t, uint64_t> &R : Ranges)
+      if (InputSectionBase *S = findSection<ELFT>(Sections, R.first))
+        Ret.push_back(
+            {S, R.first - S->Offset, R.second - S->Offset, CurrentCU});
+    ++CurrentCU;
+  }
+  return Ret;
+}
+
+static std::vector<std::pair<StringRef, uint8_t>>
+readPubNamesAndTypes(DWARFContext &Dwarf, bool IsLE) {
+  StringRef Data[] = {Dwarf.getGnuPubNamesSection(),
+                      Dwarf.getGnuPubTypesSection()};
+
+  std::vector<std::pair<StringRef, uint8_t>> Ret;
+  for (StringRef D : Data) {
+    DWARFDebugPubTable PubTable(D, IsLE, true);
+    for (const DWARFDebugPubTable::Set &Set : PubTable.getData())
+      for (const DWARFDebugPubTable::Entry &Ent : Set.Entries)
+        Ret.push_back({Ent.Name, Ent.Descriptor.toBits()});
+  }
+  return Ret;
+}
+
+class ObjInfoTy : public llvm::LoadedObjectInfo {
+  uint64_t getSectionLoadAddress(const object::SectionRef &Sec) const override {
+    auto &S = static_cast<const object::ELFSectionRef &>(Sec);
+    if (S.getFlags() & ELF::SHF_ALLOC)
+      return S.getOffset();
+    return 0;
+  }
+
+  std::unique_ptr<llvm::LoadedObjectInfo> clone() const override { return {}; }
+};
+
 template <class ELFT> void GdbIndexSection<ELFT>::readDwarf(InputSection *Sec) {
-  GdbIndexBuilder<ELFT> Builder(Sec);
-  if (ErrorCount)
+  elf::ObjectFile<ELFT> *File = Sec->template getFile<ELFT>();
+
+  Expected<std::unique_ptr<object::ObjectFile>> Obj =
+      object::ObjectFile::createObjectFile(File->MB);
+  if (!Obj) {
+    error(toString(File) + ": error creating DWARF context");
     return;
+  }
+
+  ObjInfoTy ObjInfo;
+  DWARFContextInMemory Dwarf(*Obj.get(), &ObjInfo);
 
   size_t CuId = CompilationUnits.size();
-  std::vector<std::pair<uintX_t, uintX_t>> CuList = Builder.readCUList();
-  CompilationUnits.insert(CompilationUnits.end(), CuList.begin(), CuList.end());
+  for (std::pair<uint64_t, uint64_t> &P : readCuList(Dwarf, Sec))
+    CompilationUnits.push_back(P);
 
-  std::vector<AddressEntry<ELFT>> AddrArea = Builder.readAddressArea(CuId);
-  AddressArea.insert(AddressArea.end(), AddrArea.begin(), AddrArea.end());
+  for (AddressEntry &Ent : readAddressArea<ELFT>(Dwarf, Sec, CuId))
+    AddressArea.push_back(Ent);
 
   std::vector<std::pair<StringRef, uint8_t>> NamesAndTypes =
-      Builder.readPubNamesAndTypes();
+      readPubNamesAndTypes(Dwarf, ELFT::TargetEndianness == support::little);
 
   for (std::pair<StringRef, uint8_t> &Pair : NamesAndTypes) {
     uint32_t Hash = hash(Pair.first);
@@ -1785,7 +1860,7 @@ template <class ELFT> void GdbIndexSection<ELFT>::writeTo(uint8_t *Buf) {
   }
 
   // Write the address area.
-  for (AddressEntry<ELFT> &E : AddressArea) {
+  for (AddressEntry &E : AddressArea) {
     uintX_t BaseAddr =
         E.Section->OutSec->Addr + E.Section->template getOffset<ELFT>(0);
     write64le(Buf, BaseAddr + E.LowAddress);
diff --git a/lld/ELF/SyntheticSections.h b/lld/ELF/SyntheticSections.h
index c874c0e256d..6c37a3e56bc 100644
--- a/lld/ELF/SyntheticSections.h
+++ b/lld/ELF/SyntheticSections.h
@@ -521,7 +521,7 @@ public:
   // The CU vector portion of the constant pool.
   std::vector<std::vector<std::pair<uint32_t, uint8_t>>> CuVectors;
 
-  std::vector<AddressEntry<ELFT>> AddressArea;
+  std::vector<AddressEntry> AddressArea;
 
 private:
   void readDwarf(InputSection *Sec);