87 lines
3.3 KiB
C
87 lines
3.3 KiB
C
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//===- MCSectionXCOFF.h - XCOFF Machine Code Sections -----------*- C++ -*-===//
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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 declares the MCSectionXCOFF class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTIONXCOFF_H
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#define LLVM_MC_MCSECTIONXCOFF_H
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#include "llvm/BinaryFormat/XCOFF.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbolXCOFF.h"
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namespace llvm {
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// This class represents an XCOFF `Control Section`, more commonly referred to
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// as a csect. A csect represents the smallest possible unit of data/code which
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// will be relocated as a single block. A csect can either be:
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// 1) Initialized: The Type will be XTY_SD, and the symbols inside the csect
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// will have a label definition representing their offset within the csect.
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// 2) Uninitialized: The Type will be XTY_CM, it will contain a single symbol,
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// and may not contain label definitions.
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// 3) An external reference providing a symbol table entry for a symbol
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// contained in another XCOFF object file. External reference csects are not
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// implemented yet.
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class MCSectionXCOFF final : public MCSection {
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friend class MCContext;
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XCOFF::StorageMappingClass MappingClass;
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XCOFF::SymbolType Type;
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MCSymbolXCOFF *const QualName;
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StringRef SymbolTableName;
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bool MultiSymbolsAllowed;
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static constexpr unsigned DefaultAlignVal = 4;
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MCSectionXCOFF(StringRef Name, XCOFF::StorageMappingClass SMC,
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XCOFF::SymbolType ST, SectionKind K, MCSymbolXCOFF *QualName,
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MCSymbol *Begin, StringRef SymbolTableName,
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bool MultiSymbolsAllowed)
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: MCSection(SV_XCOFF, Name, K, Begin), MappingClass(SMC), Type(ST),
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QualName(QualName), SymbolTableName(SymbolTableName),
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MultiSymbolsAllowed(MultiSymbolsAllowed) {
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assert((ST == XCOFF::XTY_SD || ST == XCOFF::XTY_CM || ST == XCOFF::XTY_ER) &&
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"Invalid or unhandled type for csect.");
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assert(QualName != nullptr && "QualName is needed.");
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QualName->setRepresentedCsect(this);
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QualName->setStorageClass(XCOFF::C_HIDEXT);
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// A csect is 4 byte aligned by default, except for undefined symbol csects.
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if (Type != XCOFF::XTY_ER)
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setAlignment(Align(DefaultAlignVal));
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}
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void printCsectDirective(raw_ostream &OS) const;
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public:
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~MCSectionXCOFF();
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static bool classof(const MCSection *S) {
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return S->getVariant() == SV_XCOFF;
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}
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XCOFF::StorageMappingClass getMappingClass() const { return MappingClass; }
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XCOFF::StorageClass getStorageClass() const {
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return QualName->getStorageClass();
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}
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XCOFF::SymbolType getCSectType() const { return Type; }
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MCSymbolXCOFF *getQualNameSymbol() const { return QualName; }
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void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
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raw_ostream &OS,
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const MCExpr *Subsection) const override;
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bool UseCodeAlign() const override;
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bool isVirtualSection() const override;
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StringRef getSymbolTableName() const { return SymbolTableName; }
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bool isMultiSymbolsAllowed() const { return MultiSymbolsAllowed; }
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};
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} // end namespace llvm
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#endif
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