lib/MC/MCXCOFFStreamer.cpp

   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/MC/MCXCOFFStreamer.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/Support/TargetRegistry.h"
  19
  20 using namespace llvm;
  21
  22 MCXCOFFStreamer::MCXCOFFStreamer(MCContext &Context,
  23                                  std::unique_ptr<MCAsmBackend> MAB,
  24                                  std::unique_ptr<MCObjectWriter> OW,
  25                                  std::unique_ptr<MCCodeEmitter> Emitter)
  26     : MCObjectStreamer(Context, std::move(MAB), std::move(OW),
  27                        std::move(Emitter)) {}
  28
  29 bool MCXCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
  30                                           MCSymbolAttr Attribute) {
  31   report_fatal_error("Symbol attributes not implemented for XCOFF.");
  32 }
  33
  34 void MCXCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  35                                        unsigned ByteAlignment) {
  36   getAssembler().registerSymbol(*Symbol);
  37   Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
  38                       XCOFF::C_HIDEXT);
  39   Symbol->setCommon(Size, ByteAlignment);
  40
  41   // Need to add this symbol to the current Fragment which will belong to the
  42   // containing CSECT.
  43   auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
  44   assert(F && "Expected a valid section with a fragment set.");
  45   Symbol->setFragment(F);
  46
  47   // Emit the alignment and storage for the variable to the section.
  48   EmitValueToAlignment(ByteAlignment);
  49   EmitZeros(Size);
  50 }
  51
  52 void MCXCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
  53                                    uint64_t Size, unsigned ByteAlignment,
  54                                    SMLoc Loc) {
  55   report_fatal_error("Zero fill not implemented for XCOFF.");
  56 }
  57
  58 void MCXCOFFStreamer::EmitInstToData(const MCInst &Inst,
  59                                      const MCSubtargetInfo &) {
  60   report_fatal_error("Instruction emission not implemented for XCOFF.");
  61 }
  62
  63 MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
  64                                       std::unique_ptr<MCAsmBackend> &&MAB,
  65                                       std::unique_ptr<MCObjectWriter> &&OW,
  66                                       std::unique_ptr<MCCodeEmitter> &&CE,
  67                                       bool RelaxAll) {
  68   MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
  69                                            std::move(OW), std::move(CE));
  70   if (RelaxAll)
  71     S->getAssembler().setRelaxAll(true);
  72   return S;
  73 }
  74
  75 void MCXCOFFStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  76                                             unsigned ByteAlign) {
  77   report_fatal_error("Emission of local commons not implemented yet.");
  78 }