1//=== MachORelocation.h - Mach-O Relocation Info ----------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the MachORelocation class.
10//
11//===----------------------------------------------------------------------===//
12
13
14#ifndef LLVM_CODEGEN_MACHORELOCATION_H
15#define LLVM_CODEGEN_MACHORELOCATION_H
16
17#include "llvm/Support/DataTypes.h"
18
19namespace llvm {
20
21  /// MachORelocation - This struct contains information about each relocation
22  /// that needs to be emitted to the file.
23  /// see <mach-o/reloc.h>
24  class MachORelocation {
25    uint32_t r_address;   // offset in the section to what is being  relocated
26    uint32_t r_symbolnum; // symbol index if r_extern == 1 else section index
27    bool     r_pcrel;     // was relocated pc-relative already
28    uint8_t  r_length;    // length = 2 ^ r_length
29    bool     r_extern;    //
30    uint8_t  r_type;      // if not 0, machine-specific relocation type.
31    bool     r_scattered; // 1 = scattered, 0 = non-scattered
32    int32_t  r_value;     // the value the item to be relocated is referring
33                          // to.
34  public:
35    uint32_t getPackedFields() const {
36      if (r_scattered)
37        return (1 << 31) | (r_pcrel << 30) | ((r_length & 3) << 28) |
38          ((r_type & 15) << 24) | (r_address & 0x00FFFFFF);
39      else
40        return (r_symbolnum << 8) | (r_pcrel << 7) | ((r_length & 3) << 5) |
41          (r_extern << 4) | (r_type & 15);
42    }
43    uint32_t getAddress() const { return r_scattered ? r_value : r_address; }
44    uint32_t getRawAddress() const { return r_address; }
45
46    MachORelocation(uint32_t addr, uint32_t index, bool pcrel, uint8_t len,
47                    bool ext, uint8_t type, bool scattered = false,
48                    int32_t value = 0) :
49      r_address(addr), r_symbolnum(index), r_pcrel(pcrel), r_length(len),
50      r_extern(ext), r_type(type), r_scattered(scattered), r_value(value) {}
51  };
52
53} // end llvm namespace
54
55#endif // LLVM_CODEGEN_MACHORELOCATION_H
56