MCXCOFFStreamer.cpp revision 360784 
1//===- lib/MC/MCXCOFFStreamer.cpp - XCOFF Object Output -------------------===//
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 assembles .s files and emits XCOFF .o object files.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/BinaryFormat/XCOFF.h"
14#include "llvm/MC/MCAsmBackend.h"
15#include "llvm/MC/MCCodeEmitter.h"
16#include "llvm/MC/MCObjectWriter.h"
17#include "llvm/MC/MCSymbolXCOFF.h"
18#include "llvm/MC/MCXCOFFStreamer.h"
19#include "llvm/Support/TargetRegistry.h"
20
21using namespace llvm;
22
23MCXCOFFStreamer::MCXCOFFStreamer(MCContext &Context,
24                                 std::unique_ptr<MCAsmBackend> MAB,
25                                 std::unique_ptr<MCObjectWriter> OW,
26                                 std::unique_ptr<MCCodeEmitter> Emitter)
27    : MCObjectStreamer(Context, std::move(MAB), std::move(OW),
28                       std::move(Emitter)) {}
29
30bool MCXCOFFStreamer::EmitSymbolAttribute(MCSymbol *Sym,
31                                          MCSymbolAttr Attribute) {
32  auto *Symbol = cast<MCSymbolXCOFF>(Sym);
33  getAssembler().registerSymbol(*Symbol);
34
35  switch (Attribute) {
36  case MCSA_Global:
37    Symbol->setStorageClass(XCOFF::C_EXT);
38    Symbol->setExternal(true);
39    break;
40  default:
41    report_fatal_error("Not implemented yet.");
42  }
43  return true;
44}
45
46void MCXCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
47                                       unsigned ByteAlignment) {
48  getAssembler().registerSymbol(*Symbol);
49  Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
50                      XCOFF::C_HIDEXT);
51  Symbol->setCommon(Size, ByteAlignment);
52
53  // Emit the alignment and storage for the variable to the section.
54  EmitValueToAlignment(ByteAlignment);
55  EmitZeros(Size);
56}
57
58void MCXCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
59                                   uint64_t Size, unsigned ByteAlignment,
60                                   SMLoc Loc) {
61  report_fatal_error("Zero fill not implemented for XCOFF.");
62}
63
64void MCXCOFFStreamer::EmitInstToData(const MCInst &Inst,
65                                     const MCSubtargetInfo &STI) {
66  MCAssembler &Assembler = getAssembler();
67  SmallVector<MCFixup, 4> Fixups;
68  SmallString<256> Code;
69  raw_svector_ostream VecOS(Code);
70  Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
71
72  // TODO: Handle Fixups later
73
74  MCDataFragment *DF = getOrCreateDataFragment(&STI);
75  DF->setHasInstructions(STI);
76  DF->getContents().append(Code.begin(), Code.end());
77}
78
79MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
80                                      std::unique_ptr<MCAsmBackend> &&MAB,
81                                      std::unique_ptr<MCObjectWriter> &&OW,
82                                      std::unique_ptr<MCCodeEmitter> &&CE,
83                                      bool RelaxAll) {
84  MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
85                                           std::move(OW), std::move(CE));
86  if (RelaxAll)
87    S->getAssembler().setRelaxAll(true);
88  return S;
89}
90
91void MCXCOFFStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
92                                                 uint64_t Size,
93                                                 MCSymbol *CsectSym,
94                                                 unsigned ByteAlignment) {
95  EmitCommonSymbol(CsectSym, Size, ByteAlignment);
96}
97