1 //===- MCAsmBackend.cpp - Target MC Assembly Backend ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCAsmBackend.h"
11 #include "llvm/ADT/None.h"
12 #include "llvm/ADT/STLExtras.h"
13 #include "llvm/MC/MCCodePadder.h"
14 #include "llvm/MC/MCFixupKindInfo.h"
21 MCAsmBackend::MCAsmBackend() : CodePadder(new MCCodePadder()) {}
23 MCAsmBackend::MCAsmBackend(std::unique_ptr<MCCodePadder> TargetCodePadder)
24 : CodePadder(std::move(TargetCodePadder)) {}
26 MCAsmBackend::~MCAsmBackend() = default;
28 Optional<MCFixupKind> MCAsmBackend::getFixupKind(StringRef Name) const {
32 const MCFixupKindInfo &MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
33 static const MCFixupKindInfo Builtins[] = {
34 {"FK_Data_1", 0, 8, 0},
35 {"FK_Data_2", 0, 16, 0},
36 {"FK_Data_4", 0, 32, 0},
37 {"FK_Data_8", 0, 64, 0},
38 {"FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel},
39 {"FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel},
40 {"FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
41 {"FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel},
42 {"FK_GPRel_1", 0, 8, 0},
43 {"FK_GPRel_2", 0, 16, 0},
44 {"FK_GPRel_4", 0, 32, 0},
45 {"FK_GPRel_8", 0, 64, 0},
46 {"FK_DTPRel_4", 0, 32, 0},
47 {"FK_DTPRel_8", 0, 64, 0},
48 {"FK_TPRel_4", 0, 32, 0},
49 {"FK_TPRel_8", 0, 64, 0},
50 {"FK_SecRel_1", 0, 8, 0},
51 {"FK_SecRel_2", 0, 16, 0},
52 {"FK_SecRel_4", 0, 32, 0},
53 {"FK_SecRel_8", 0, 64, 0}};
55 assert((size_t)Kind <= array_lengthof(Builtins) && "Unknown fixup kind");
56 return Builtins[Kind];
59 bool MCAsmBackend::fixupNeedsRelaxationAdvanced(
60 const MCFixup &Fixup, bool Resolved, uint64_t Value,
61 const MCRelaxableFragment *DF, const MCAsmLayout &Layout) const {
64 return fixupNeedsRelaxation(Fixup, Value, DF, Layout);
67 void MCAsmBackend::handleCodePaddingBasicBlockStart(
68 MCObjectStreamer *OS, const MCCodePaddingContext &Context) {
69 CodePadder->handleBasicBlockStart(OS, Context);
72 void MCAsmBackend::handleCodePaddingBasicBlockEnd(
73 const MCCodePaddingContext &Context) {
74 CodePadder->handleBasicBlockEnd(Context);
77 void MCAsmBackend::handleCodePaddingInstructionBegin(const MCInst &Inst) {
78 CodePadder->handleInstructionBegin(Inst);
81 void MCAsmBackend::handleCodePaddingInstructionEnd(const MCInst &Inst) {
82 CodePadder->handleInstructionEnd(Inst);
85 bool MCAsmBackend::relaxFragment(MCPaddingFragment *PF, MCAsmLayout &Layout) {
86 return CodePadder->relaxFragment(PF, Layout);