Port Android relocation packer to chromium build

third_party/android_platform/relocation_packer/src/elf_file.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // ELF shared object file updates handler.
 //
 // Provides functions to remove relative relocations from the .rel.dyn
 // or .rela.dyn sections and pack into .android.rel.dyn or .android.rela.dyn,
 // and unpack to return the file to its pre-packed state.
 //
@@ skipping 49 matching lines @@
 
 #include "elf.h"
 #include "libelf.h"
 #include "packer.h"
 
 namespace relocation_packer {
 
 // An ElfFile reads shared objects, and shuttles relative relocations
 // between .rel.dyn or .rela.dyn and .android.rel.dyn or .android.rela.dyn
 // sections.
+template <typename ELF>
 class ElfFile {
  public:
   explicit ElfFile(int fd)
       : fd_(fd), is_padding_relocations_(false), elf_(NULL),
         relocations_section_(NULL), dynamic_section_(NULL),
-        android_relocations_section_(NULL), relocations_type_(NONE) {}
+        relocations_type_(NONE) {}
   ~ElfFile() {}
 
   // Set padding mode.  When padding, PackRelocations() will not shrink
   // the .rel.dyn or .rela.dyn section, but instead replace relative with
   // NONE-type entries.
   // |flag| is true to pad .rel.dyn or .rela.dyn, false to shrink it.
   inline void SetPadding(bool flag) { is_padding_relocations_ = flag; }
 
   // Transfer relative relocations from .rel.dyn or .rela.dyn to a packed
   // representation in .android.rel.dyn or .android.rela.dyn.  Returns true
   // on success.
   bool PackRelocations();
 
   // Transfer relative relocations from a packed representation in
   // .android.rel.dyn or .android.rela.dyn to .rel.dyn or .rela.dyn.  Returns
   // true on success.
   bool UnpackRelocations();
 
  private:
+  enum relocations_type_t {
+    NONE = 0, REL, RELA
+  };
+
   // Load a new ElfFile from a filedescriptor.  If flushing, the file must
   // be open for read/write.  Returns true on successful ELF file load.
   // |fd| is an open file descriptor for the shared object.
   bool Load();
 
   // Templated packer, helper for PackRelocations().  Rel type is one of
   // ELF::Rel or ELF::Rela.
-  template <typename Rel>
-  bool PackTypedRelocations(const std::vector<Rel>& relocations);
+  bool PackTypedRelocations(std::vector<typename ELF::Rela>* relocations);
 
   // Templated unpacker, helper for UnpackRelocations().  Rel type is one of
   // ELF::Rel or ELF::Rela.
-  template <typename Rel>
   bool UnpackTypedRelocations(const std::vector<uint8_t>& packed);
 
   // Write ELF file changes.
   void Flush();
 
+  void AdjustRelativeRelocationTargets(typename ELF::Off hole_start,
+                                       ssize_t hole_size,
+                                       std::vector<typename ELF::Rela>* relocations);
+
+  static void ResizeSection(Elf* elf, Elf_Scn* section, size_t new_size,
+                            typename ELF::Word new_sh_type, relocations_type_t relocations_type);
+
+  static void AdjustDynamicSectionForHole(Elf_Scn* dynamic_section,
+                                          typename ELF::Off hole_start,
+                                          ssize_t hole_size,
+                                          relocations_type_t relocations_type);
+
+  static void ConvertRelArrayToRelaVector(const typename ELF::Rel* rel_array, size_t rel_array_size,
+                                          std::vector<typename ELF::Rela>* rela_vector);
+
+  static void ConvertRelaVectorToRelVector(const std::vector<typename ELF::Rela>& rela_vector,
+                                           std::vector<typename ELF::Rel>* rel_vector);
+
+
   // File descriptor opened on the shared object.
   int fd_;
 
   // If set, pad rather than shrink .rel.dyn or .rela.dyn.  Primarily for
   // debugging, allows packing to be checked without affecting load addresses.
   bool is_padding_relocations_;
 
   // Libelf handle, assigned by Load().
   Elf* elf_;
 
   // Sections that we manipulate, assigned by Load().
   Elf_Scn* relocations_section_;
   Elf_Scn* dynamic_section_;
-  Elf_Scn* android_relocations_section_;
 
   // Relocation type found, assigned by Load().
-  enum { NONE = 0, REL, RELA } relocations_type_;
+  relocations_type_t relocations_type_;
 };
 
 }  // namespace relocation_packer
 
 #endif  // TOOLS_RELOCATION_PACKER_SRC_ELF_FILE_H_