137 lines
4.9 KiB
C++
137 lines
4.9 KiB
C++
//===- lib/MC/MCXCOFFStreamer.cpp - XCOFF Object Output -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file assembles .s files and emits XCOFF .o object files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCXCOFFStreamer.h"
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#include "llvm/BinaryFormat/XCOFF.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSectionXCOFF.h"
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#include "llvm/MC/MCSymbolXCOFF.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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MCXCOFFStreamer::MCXCOFFStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> MAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter)
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: MCObjectStreamer(Context, std::move(MAB), std::move(OW),
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std::move(Emitter)) {}
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bool MCXCOFFStreamer::emitSymbolAttribute(MCSymbol *Sym,
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MCSymbolAttr Attribute) {
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auto *Symbol = cast<MCSymbolXCOFF>(Sym);
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getAssembler().registerSymbol(*Symbol);
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switch (Attribute) {
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case MCSA_Global:
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case MCSA_Extern:
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Symbol->setStorageClass(XCOFF::C_EXT);
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Symbol->setExternal(true);
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break;
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case MCSA_LGlobal:
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Symbol->setStorageClass(XCOFF::C_HIDEXT);
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Symbol->setExternal(true);
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break;
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case llvm::MCSA_Weak:
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Symbol->setStorageClass(XCOFF::C_WEAKEXT);
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Symbol->setExternal(true);
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break;
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case llvm::MCSA_Hidden:
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Symbol->setVisibilityType(XCOFF::SYM_V_HIDDEN);
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break;
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case llvm::MCSA_Protected:
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Symbol->setVisibilityType(XCOFF::SYM_V_PROTECTED);
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break;
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default:
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report_fatal_error("Not implemented yet.");
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}
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return true;
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}
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void MCXCOFFStreamer::emitXCOFFSymbolLinkageWithVisibility(
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MCSymbol *Symbol, MCSymbolAttr Linkage, MCSymbolAttr Visibility) {
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emitSymbolAttribute(Symbol, Linkage);
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// When the caller passes `MCSA_Invalid` for the visibility, do not emit one.
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if (Visibility == MCSA_Invalid)
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return;
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emitSymbolAttribute(Symbol, Visibility);
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}
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void MCXCOFFStreamer::emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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getAssembler().registerSymbol(*Symbol);
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Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
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XCOFF::C_HIDEXT);
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Symbol->setCommon(Size, ByteAlignment);
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// Default csect align is 4, but common symbols have explicit alignment values
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// and we should honor it.
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cast<MCSymbolXCOFF>(Symbol)->getRepresentedCsect()->setAlignment(
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Align(ByteAlignment));
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// Emit the alignment and storage for the variable to the section.
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emitValueToAlignment(ByteAlignment);
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emitZeros(Size);
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}
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void MCXCOFFStreamer::emitZerofill(MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment,
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SMLoc Loc) {
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report_fatal_error("Zero fill not implemented for XCOFF.");
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}
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void MCXCOFFStreamer::emitInstToData(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCAssembler &Assembler = getAssembler();
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SmallVector<MCFixup, 4> Fixups;
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
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// Add the fixups and data.
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MCDataFragment *DF = getOrCreateDataFragment(&STI);
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const size_t ContentsSize = DF->getContents().size();
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auto &DataFragmentFixups = DF->getFixups();
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for (auto &Fixup : Fixups) {
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Fixup.setOffset(Fixup.getOffset() + ContentsSize);
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DataFragmentFixups.push_back(Fixup);
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}
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DF->setHasInstructions(STI);
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DF->getContents().append(Code.begin(), Code.end());
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}
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MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> &&MAB,
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std::unique_ptr<MCObjectWriter> &&OW,
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std::unique_ptr<MCCodeEmitter> &&CE,
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bool RelaxAll) {
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MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
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std::move(OW), std::move(CE));
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if (RelaxAll)
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S->getAssembler().setRelaxAll(true);
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return S;
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}
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void MCXCOFFStreamer::emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
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uint64_t Size,
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MCSymbol *CsectSym,
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unsigned ByteAlignment) {
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emitCommonSymbol(CsectSym, Size, ByteAlignment);
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}
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