1//=== MachORelocation.h - Mach-O Relocation Info ----------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the MachORelocation class.
11//
12//===----------------------------------------------------------------------===//
13
14
15#ifndef LLVM_CODEGEN_MACHORELOCATION_H
16#define LLVM_CODEGEN_MACHORELOCATION_H
17
18#include "llvm/Support/DataTypes.h"
19
20namespace llvm {
21
22  /// MachORelocation - This struct contains information about each relocation
23  /// that needs to be emitted to the file.
24  /// see <mach-o/reloc.h>
25  class MachORelocation {
26    uint32_t r_address;   // offset in the section to what is being  relocated
27    uint32_t r_symbolnum; // symbol index if r_extern == 1 else section index
28    bool     r_pcrel;     // was relocated pc-relative already
29    uint8_t  r_length;    // length = 2 ^ r_length
30    bool     r_extern;    //
31    uint8_t  r_type;      // if not 0, machine-specific relocation type.
32    bool     r_scattered; // 1 = scattered, 0 = non-scattered
33    int32_t  r_value;     // the value the item to be relocated is referring
34                          // to.
35  public:
36    uint32_t getPackedFields() const {
37      if (r_scattered)
38        return (1 << 31) | (r_pcrel << 30) | ((r_length & 3) << 28) |
39          ((r_type & 15) << 24) | (r_address & 0x00FFFFFF);
40      else
41        return (r_symbolnum << 8) | (r_pcrel << 7) | ((r_length & 3) << 5) |
42          (r_extern << 4) | (r_type & 15);
43    }
44    uint32_t getAddress() const { return r_scattered ? r_value : r_address; }
45    uint32_t getRawAddress() const { return r_address; }
46
47    MachORelocation(uint32_t addr, uint32_t index, bool pcrel, uint8_t len,
48                    bool ext, uint8_t type, bool scattered = false,
49                    int32_t value = 0) :
50      r_address(addr), r_symbolnum(index), r_pcrel(pcrel), r_length(len),
51      r_extern(ext), r_type(type), r_scattered(scattered), r_value(value) {}
52  };
53
54} // end llvm namespace
55
56#endif // LLVM_CODEGEN_MACHORELOCATION_H
57