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 
19 namespace 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:
getPackedFields()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     }
getAddress()43     uint32_t getAddress() const { return r_scattered ? r_value : r_address; }
getRawAddress()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) :
r_address(addr)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