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  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:
  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.