[Courgette] Make ELF section header sorting less intrusive.

courgette/disassembler_elf_32.h

 // Copyright 2013 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.
 
 #ifndef COURGETTE_DISASSEMBLER_ELF_32_H_
 #define COURGETTE_DISASSEMBLER_ELF_32_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 144 matching lines @@
                               FileOffset end_file_offset,
                               AssemblyProgram* program) WARN_UNUSED_RESULT;
 
   CheckBool ParseAbs32Relocs() WARN_UNUSED_RESULT;
 
   CheckBool CheckSection(RVA rva) WARN_UNUSED_RESULT;
 
   CheckBool ParseRel32RelocsFromSections() WARN_UNUSED_RESULT;
 
   const Elf32_Ehdr* header_;
+
+  Elf32_Half section_header_table_size_;
+
+  // Section header table, ordered by section id.
   std::vector<Elf32_Shdr> section_header_table_;
-  Elf32_Half section_header_table_size_;
+
+  // An ordering of |section_header_table_|, sorted by file offset.
+  std::vector<Elf32_Half> section_header_file_offset_order_;
 
   const Elf32_Phdr* program_header_table_;
   Elf32_Half program_header_table_size_;
 
-  // Section header for default
+  // Pointer to section names.
   const char* default_string_section_;
 
   std::vector<RVA> abs32_locations_;
   ScopedVector<TypedRVA> rel32_locations_;
 
   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32);
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_DISASSEMBLER_ELF_32_H_