1 //===-- ARMAsmBackend.cpp - ARM Assembler 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/Target/TargetAsmBackend.h"
12 //FIXME: add #include "ARMFixupKinds.h"
13 #include "llvm/ADT/Twine.h"
14 #include "llvm/MC/ELFObjectWriter.h"
15 #include "llvm/MC/MCAssembler.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCObjectWriter.h"
18 #include "llvm/MC/MCSectionELF.h"
19 #include "llvm/MC/MCSectionMachO.h"
20 #include "llvm/MC/MachObjectWriter.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm/Target/TargetRegistry.h"
24 #include "llvm/Target/TargetAsmBackend.h"
28 class ARMAsmBackend : public TargetAsmBackend {
30 ARMAsmBackend(const Target &T)
31 : TargetAsmBackend(T) {
34 bool MayNeedRelaxation(const MCInst &Inst) const;
36 void RelaxInstruction(const MCInst &Inst, MCInst &Res) const;
38 bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const;
41 bool ARMAsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
42 // FIXME: Thumb targets, different move constant targets..
46 void ARMAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
47 assert(0 && "ARMAsmBackend::RelaxInstruction() unimplemented");
51 bool ARMAsmBackend::WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
52 assert(0 && "ARMAsmBackend::WriteNopData() unimplemented");
53 if ((Count % 4) != 0) {
54 // Fixme: % 2 for Thumb?
59 } // end anonymous namespace
62 // FIXME: This should be in a separate file.
63 // ELF is an ELF of course...
64 class ELFARMAsmBackend : public ARMAsmBackend {
66 Triple::OSType OSType;
67 ELFARMAsmBackend(const Target &T, Triple::OSType _OSType)
68 : ARMAsmBackend(T), OSType(_OSType) {
69 HasAbsolutizedSet = true;
70 HasScatteredSymbols = true;
73 void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
74 uint64_t Value) const;
76 bool isVirtualSection(const MCSection &Section) const {
77 const MCSectionELF &SE = static_cast<const MCSectionELF&>(Section);
78 return SE.getType() == MCSectionELF::SHT_NOBITS;
81 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
82 return new ELFObjectWriter(OS, /*Is64Bit=*/false,
84 /*IsLittleEndian=*/true,
85 /*HasRelocationAddend=*/false);
88 unsigned getPointerSize() const {
93 // Fixme: can we raise this to share code between Darwin and ELF?
94 void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
95 uint64_t Value) const {
96 assert(0 && "ELFARMAsmBackend::ApplyFixup() unimplemented");
99 // FIXME: This should be in a separate file.
100 class DarwinARMAsmBackend : public ARMAsmBackend {
102 DarwinARMAsmBackend(const Target &T)
104 HasAbsolutizedSet = true;
105 HasScatteredSymbols = true;
106 assert(0 && "DarwinARMAsmBackend::DarwinARMAsmBackend() unimplemented");
109 void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
110 uint64_t Value) const;
112 bool isVirtualSection(const MCSection &Section) const {
113 const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
114 return (SMO.getType() == MCSectionMachO::S_ZEROFILL ||
115 SMO.getType() == MCSectionMachO::S_GB_ZEROFILL ||
116 SMO.getType() == MCSectionMachO::S_THREAD_LOCAL_ZEROFILL);
119 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
120 return new MachObjectWriter(OS, /*Is64Bit=*/false);
123 unsigned getPointerSize() const {
127 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
132 void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
133 uint64_t Value) const {
134 assert(0 && "DarwinARMAsmBackend::ApplyFixup() unimplemented");
136 } // end anonymous namespace
138 TargetAsmBackend *llvm::createARMAsmBackend(const Target &T,
139 const std::string &TT) {
140 switch (Triple(TT).getOS()) {
142 return new DarwinARMAsmBackend(T);
143 case Triple::MinGW32:
146 assert(0 && "Windows not supported on ARM");
148 return new ELFARMAsmBackend(T, Triple(TT).getOS());