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//===- MCSectionXCOFF.h - XCOFF Machine Code Sections -----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the MCSectionXCOFF class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONXCOFF_H
#define LLVM_MC_MCSECTIONXCOFF_H
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/XCOFF.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbolXCOFF.h"
namespace llvm {
// This class represents an XCOFF `Control Section`, more commonly referred to
// as a csect. A csect represents the smallest possible unit of data/code which
// will be relocated as a single block. A csect can either be:
// 1) Initialized: The Type will be XTY_SD, and the symbols inside the csect
// will have a label definition representing their offset within the csect.
// 2) Uninitialized: The Type will be XTY_CM, it will contain a single symbol,
// and may not contain label definitions.
// 3) An external reference providing a symbol table entry for a symbol
// contained in another XCOFF object file. External reference csects are not
// implemented yet.
class MCSectionXCOFF final : public MCSection {
friend class MCContext;
StringRef Name;
XCOFF::StorageMappingClass MappingClass;
XCOFF::SymbolType Type;
XCOFF::StorageClass StorageClass;
MCSymbolXCOFF *const QualName;
MCSectionXCOFF(StringRef Section, XCOFF::StorageMappingClass SMC,
XCOFF::SymbolType ST, XCOFF::StorageClass SC, SectionKind K,
MCSymbolXCOFF *QualName, MCSymbol *Begin)
: MCSection(SV_XCOFF, K, Begin), Name(Section), MappingClass(SMC),
Type(ST), StorageClass(SC), QualName(QualName) {
assert((ST == XCOFF::XTY_SD || ST == XCOFF::XTY_CM || ST == XCOFF::XTY_ER) &&
"Invalid or unhandled type for csect.");
assert(QualName != nullptr && "QualName is needed.");
QualName->setStorageClass(SC);
QualName->setContainingCsect(this);
}
public:
~MCSectionXCOFF();
static bool classof(const MCSection *S) {
return S->getVariant() == SV_XCOFF;
}
StringRef getSectionName() const { return Name; }
XCOFF::StorageMappingClass getMappingClass() const { return MappingClass; }
XCOFF::StorageClass getStorageClass() const { return StorageClass; }
XCOFF::SymbolType getCSectType() const { return Type; }
MCSymbolXCOFF *getQualNameSymbol() const { return QualName; }
void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
raw_ostream &OS,
const MCExpr *Subsection) const override;
bool UseCodeAlign() const override;
bool isVirtualSection() const override;
};
} // end namespace llvm
#endif
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