include/llvm/CodeGen/MachORelocation.h

   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