Make getRelocationSection MachO only.
authorRafael Espindola <rafael.espindola@gmail.com>
Fri, 19 Jun 2015 17:54:28 +0000 (17:54 +0000)
committerRafael Espindola <rafael.espindola@gmail.com>
Fri, 19 Jun 2015 17:54:28 +0000 (17:54 +0000)
There are 3 types of relocations on MachO
* Scattered
* Section based
* Symbol based

On ELF and COFF relocations are symbol based.

We were in the strange situation that we abstracted over two of them. This makes
section based relocations MachO only.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240149 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/COFF.h
include/llvm/Object/ELFObjectFile.h
include/llvm/Object/MachO.h
include/llvm/Object/ObjectFile.h
lib/DebugInfo/DWARF/DWARFContext.cpp
lib/Object/COFFObjectFile.cpp
tools/llvm-readobj/MachODumper.cpp

index 564eb7a..ad657b5 100644 (file)
@@ -641,7 +641,6 @@ protected:
   std::error_code getRelocationOffset(DataRefImpl Rel,
                                       uint64_t &Res) const override;
   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
-  section_iterator getRelocationSection(DataRefImpl Rel) const override;
   std::error_code getRelocationType(DataRefImpl Rel,
                                     uint64_t &Res) const override;
   std::error_code
index 45e6f74..a85fbd8 100644 (file)
@@ -112,7 +112,6 @@ protected:
   std::error_code getRelocationOffset(DataRefImpl Rel,
                                       uint64_t &Res) const override;
   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
-  section_iterator getRelocationSection(DataRefImpl Rel) const override;
   std::error_code getRelocationType(DataRefImpl Rel,
                                     uint64_t &Res) const override;
   std::error_code
@@ -584,20 +583,6 @@ ELFObjectFile<ELFT>::getRelocationSymbol(DataRefImpl Rel) const {
   return symbol_iterator(SymbolRef(SymbolData, this));
 }
 
-// ELF relocations can target sections, by targetting a symbol of type
-// STT_SECTION
-template <class ELFT>
-section_iterator
-ELFObjectFile<ELFT>::getRelocationSection(DataRefImpl Rel) const {
-  symbol_iterator Sym = getRelocationSymbol(Rel);
-  if (Sym == symbol_end())
-    return section_end();
-  const Elf_Sym *ESym = getSymbol(Sym->getRawDataRefImpl());
-  if (ESym->getType() != ELF::STT_SECTION)
-    return section_end();
-  return getSymbolSection(ESym);
-}
-
 template <class ELFT>
 std::error_code
 ELFObjectFile<ELFT>::getRelocationAddress(DataRefImpl Rel,
index 72db49a..4350a75 100644 (file)
@@ -236,7 +236,7 @@ public:
   std::error_code getRelocationOffset(DataRefImpl Rel,
                                       uint64_t &Res) const override;
   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
-  section_iterator getRelocationSection(DataRefImpl Rel) const override;
+  section_iterator getRelocationSection(DataRefImpl Rel) const;
   std::error_code getRelocationType(DataRefImpl Rel,
                                     uint64_t &Res) const override;
   std::error_code
index a1ae19e..e00fe0e 100644 (file)
@@ -53,7 +53,6 @@ public:
   std::error_code getAddress(uint64_t &Result) const;
   std::error_code getOffset(uint64_t &Result) const;
   symbol_iterator getSymbol() const;
-  section_iterator getSection() const;
   std::error_code getType(uint64_t &Result) const;
 
   /// @brief Indicates whether this relocation should hidden when listing
@@ -241,7 +240,6 @@ protected:
   virtual std::error_code getRelocationOffset(DataRefImpl Rel,
                                               uint64_t &Res) const = 0;
   virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
-  virtual section_iterator getRelocationSection(DataRefImpl Rel) const = 0;
   virtual std::error_code getRelocationType(DataRefImpl Rel,
                                             uint64_t &Res) const = 0;
   virtual std::error_code
@@ -459,10 +457,6 @@ inline symbol_iterator RelocationRef::getSymbol() const {
   return OwningObject->getRelocationSymbol(RelocationPimpl);
 }
 
-inline section_iterator RelocationRef::getSection() const {
-  return OwningObject->getRelocationSection(RelocationPimpl);
-}
-
 inline std::error_code RelocationRef::getType(uint64_t &Result) const {
   return OwningObject->getRelocationType(RelocationPimpl, Result);
 }
index baab387..32654f8 100644 (file)
@@ -674,7 +674,7 @@ DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj,
         uint64_t SymAddr = 0;
         uint64_t SectionLoadAddress = 0;
         object::symbol_iterator Sym = Reloc.getSymbol();
-        object::section_iterator RSec = Reloc.getSection();
+        object::section_iterator RSec = Obj.section_end();
 
         // First calculate the address of the symbol or section as it appears
         // in the objct file
@@ -682,8 +682,13 @@ DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj,
           Sym->getAddress(SymAddr);
           // Also remember what section this symbol is in for later
           Sym->getSection(RSec);
-        } else if (RSec != Obj.section_end())
+        } else if (auto *MObj = dyn_cast<MachOObjectFile>(&Obj)) {
+          // MachO also has relocations that point to sections and
+          // scattered relocations.
+          // FIXME: We are not handling scattered relocations, do we have to?
+          RSec = MObj->getRelocationSection(Reloc.getRawDataRefImpl());
           SymAddr = RSec->getAddress();
+        }
 
         // If we are given load addresses for the sections, we need to adjust:
         // SymAddr = (Address of Symbol Or Section in File) -
index 1055b98..e2f559e 100644 (file)
@@ -991,19 +991,6 @@ symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
   return symbol_iterator(SymbolRef(Ref, this));
 }
 
-section_iterator COFFObjectFile::getRelocationSection(DataRefImpl Rel) const {
-  symbol_iterator Sym = getRelocationSymbol(Rel);
-  if (Sym == symbol_end())
-    return section_end();
-  COFFSymbolRef Symb = getCOFFSymbol(*Sym);
-  if (!Symb.isSection())
-    return section_end();
-  section_iterator Res(section_end());
-  if (getSymbolSection(Sym->getRawDataRefImpl(),Res))
-    return section_end();
-  return Res;
-}
-
 std::error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
                                                   uint64_t &Res) const {
   const coff_relocation* R = toRel(Rel);
index 9017350..aeb563a 100644 (file)
@@ -479,7 +479,7 @@ void MachODumper::printRelocation(const MachOObjectFile *Obj,
         return;
     }
   } else if (!IsScattered) {
-    section_iterator SecI = Reloc.getSection();
+    section_iterator SecI = Obj->getRelocationSection(DR);
     if (SecI != Obj->section_end()) {
       if (error(SecI->getName(TargetName)))
         return;