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f77176c4ec
Summary: This patch intends to support three most common relocation type on AIX: R_POS, R_TOC, R_RBR. These three relocation type will be needed for object file generation on AIX for small code model. We will have follow up patches to bring relocation support for large code model on AIX. Reviewers: hubert.reinterpretcast, daltenty, DiggerLin Differential Revision: https://reviews.llvm.org/D72027
103 lines
3.8 KiB
C++
103 lines
3.8 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/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/MCObjectWriter.h"
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#include "llvm/MC/MCSymbolXCOFF.h"
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#include "llvm/MC/MCXCOFFStreamer.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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Symbol->setStorageClass(XCOFF::C_EXT);
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Symbol->setExternal(true);
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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::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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// 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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