Implements low-level object file format specific output for COFF and

ELF with support for:

- File headers
- Section headers + data
- Relocations
- Symbols
- Unwind data (only COFF/Win64)

The output format follows a few rules:
- Values are almost always output one per line (as elf-dump/coff-dump already do). - Many values are translated to something readable (like enum names), with the raw value in parentheses.
- Hex numbers are output in uppercase, prefixed with "0x".
- Flags are sorted alphabetically.
- Lists and groups are always delimited.

Example output:
---------- snip ----------
Sections [
  Section {
    Index: 1
    Name: .text (5)
    Type: SHT_PROGBITS (0x1)
    Flags [ (0x6)
      SHF_ALLOC (0x2)
      SHF_EXECINSTR (0x4)
    ]
    Address: 0x0
    Offset: 0x40
    Size: 33
    Link: 0
    Info: 0
    AddressAlignment: 16
    EntrySize: 0
    Relocations [
      0x6 R_386_32 .rodata.str1.1 0x0
      0xB R_386_PC32 puts 0x0
      0x12 R_386_32 .rodata.str1.1 0x0
      0x17 R_386_PC32 puts 0x0
    ]
    SectionData (
      0000: 83EC04C7 04240000 0000E8FC FFFFFFC7  |.....$..........|
      0010: 04240600 0000E8FC FFFFFF31 C083C404  |.$.........1....|
      0020: C3                                   |.|
    )
  }
]
---------- snip ----------

Relocations and symbols can be output standalone or together with the section header as displayed in the example.
This feature set supports all tests in test/MC/COFF and test/MC/ELF (and I suspect all additional tests using elf-dump), making elf-dump and coff-dump deprecated.

Patch by Nico Rieck!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178679 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-readobj/llvm-readobj.h

@@ -1,4 +1,4 @@
-//===- llvm-readobj.h - Dump contents of an Object File -------------------===//
+//===-- llvm-readobj.h ----------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,13 +10,36 @@
 #ifndef LLVM_TOOLS_READ_OBJ_H
 #define LLVM_TOOLS_READ_OBJ_H
 
-#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/CommandLine.h"
+#include <string>
 
 namespace llvm {
-namespace object { class ObjectFile; }
-class raw_ostream;
+  namespace object {
+    class RelocationRef;
+  }
 
-ErrorOr<void> dumpELFDynamicTable(object::ObjectFile *O, raw_ostream &OS);
-} // end namespace llvm
+  class error_code;
+
+  // Various helper functions.
+  bool error(error_code ec);
+  bool relocAddressLess(object::RelocationRef A,
+                        object::RelocationRef B);
+} // namespace llvm
+
+namespace opts {
+  extern llvm::cl::list<std::string> InputFilenames;
+  extern llvm::cl::opt<bool> FileHeaders;
+  extern llvm::cl::opt<bool> Sections;
+  extern llvm::cl::opt<bool> SectionRelocations;
+  extern llvm::cl::opt<bool> SectionSymbols;
+  extern llvm::cl::opt<bool> SectionData;
+  extern llvm::cl::opt<bool> Relocations;
+  extern llvm::cl::opt<bool> Symbols;
+  extern llvm::cl::opt<bool> DynamicSymbols;
+  extern llvm::cl::opt<bool> UnwindInfo;
+} // namespace opts
+
+#define LLVM_READOBJ_ENUM_ENT(ns, enum) \
+  { #enum, ns::enum }
 
 #endif