1 //===- MCAsmBackend.cpp - Target MC Assembly Backend ----------------------===//
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 #include "llvm/MC/MCAsmBackend.h"
11 #include "llvm/ADT/None.h"
12 #include "llvm/ADT/STLExtras.h"
13 #include "llvm/MC/MCFixupKindInfo.h"
14 #include <cassert>
15 #include <cstddef>
16 #include <cstdint>
17 
18 using namespace llvm;
19 
20 MCAsmBackend::MCAsmBackend() = default;
21 
22 MCAsmBackend::~MCAsmBackend() = default;
23 
24 Optional<MCFixupKind> MCAsmBackend::getFixupKind(StringRef Name) const {
25   return None;
26 }
27 
28 const MCFixupKindInfo &MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
29   static const MCFixupKindInfo Builtins[] = {
30       {"FK_Data_1", 0, 8, 0},
31       {"FK_Data_2", 0, 16, 0},
32       {"FK_Data_4", 0, 32, 0},
33       {"FK_Data_8", 0, 64, 0},
34       {"FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel},
35       {"FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel},
36       {"FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
37       {"FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel},
38       {"FK_GPRel_1", 0, 8, 0},
39       {"FK_GPRel_2", 0, 16, 0},
40       {"FK_GPRel_4", 0, 32, 0},
41       {"FK_GPRel_8", 0, 64, 0},
42       {"FK_DTPRel_4", 0, 32, 0},
43       {"FK_DTPRel_8", 0, 64, 0},
44       {"FK_TPRel_4", 0, 32, 0},
45       {"FK_TPRel_8", 0, 64, 0},
46       {"FK_SecRel_1", 0, 8, 0},
47       {"FK_SecRel_2", 0, 16, 0},
48       {"FK_SecRel_4", 0, 32, 0},
49       {"FK_SecRel_8", 0, 64, 0}};
50 
51   assert((size_t)Kind <= array_lengthof(Builtins) && "Unknown fixup kind");
52   return Builtins[Kind];
53 }
54 
55 bool MCAsmBackend::fixupNeedsRelaxationAdvanced(
56     const MCFixup &Fixup, bool Resolved, uint64_t Value,
57     const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const {
58   if (!Resolved)
59     return true;
60   return fixupNeedsRelaxation(Fixup, Value, DF, Layout);
61 }
62