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/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
  21 using namespace llvm;
  22
  23 MCXCOFFStreamer::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
  30 bool MCXCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
  31                                           MCSymbolAttr Attribute) {
  32   report_fatal_error("Symbol attributes not implemented for XCOFF.");
  33 }
  34
  35 void MCXCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  36                                        unsigned ByteAlignment) {
  37   getAssembler().registerSymbol(*Symbol);
  38   Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
  39                       XCOFF::C_HIDEXT);
  40   Symbol->setCommon(Size, ByteAlignment);
  41
  42   // Need to add this symbol to the current Fragment which will belong to the
  43   // containing CSECT.
  44   auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
  45   assert(F && "Expected a valid section with a fragment set.");
  46   Symbol->setFragment(F);
  47
  48   // Emit the alignment and storage for the variable to the section.
  49   EmitValueToAlignment(ByteAlignment);
  50   EmitZeros(Size);
  51 }
  52
  53 void MCXCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
  54                                    uint64_t Size, unsigned ByteAlignment,
  55                                    SMLoc Loc) {
  56   report_fatal_error("Zero fill not implemented for XCOFF.");
  57 }
  58
  59 void MCXCOFFStreamer::EmitInstToData(const MCInst &Inst,
  60                                      const MCSubtargetInfo &) {
  61   report_fatal_error("Instruction emission not implemented for XCOFF.");
  62 }
  63
  64 MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
  65                                       std::unique_ptr<MCAsmBackend> &&MAB,
  66                                       std::unique_ptr<MCObjectWriter> &&OW,
  67                                       std::unique_ptr<MCCodeEmitter> &&CE,
  68                                       bool RelaxAll) {
  69   MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
  70                                            std::move(OW), std::move(CE));
  71   if (RelaxAll)
  72     S->getAssembler().setRelaxAll(true);
  73   return S;
  74 }
  75
  76 void MCXCOFFStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *Symbol,
  77                                                  uint64_t Size,
  78                                                  unsigned ByteAlignment) {
  79   EmitCommonSymbol(Symbol, Size, ByteAlignment);
  80 }