87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
//===- 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/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;
|
|
|
|
XCOFF::StorageMappingClass MappingClass;
|
|
XCOFF::SymbolType Type;
|
|
MCSymbolXCOFF *const QualName;
|
|
StringRef SymbolTableName;
|
|
bool MultiSymbolsAllowed;
|
|
static constexpr unsigned DefaultAlignVal = 4;
|
|
|
|
MCSectionXCOFF(StringRef Name, XCOFF::StorageMappingClass SMC,
|
|
XCOFF::SymbolType ST, SectionKind K, MCSymbolXCOFF *QualName,
|
|
MCSymbol *Begin, StringRef SymbolTableName,
|
|
bool MultiSymbolsAllowed)
|
|
: MCSection(SV_XCOFF, Name, K, Begin), MappingClass(SMC), Type(ST),
|
|
QualName(QualName), SymbolTableName(SymbolTableName),
|
|
MultiSymbolsAllowed(MultiSymbolsAllowed) {
|
|
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->setRepresentedCsect(this);
|
|
QualName->setStorageClass(XCOFF::C_HIDEXT);
|
|
// A csect is 4 byte aligned by default, except for undefined symbol csects.
|
|
if (Type != XCOFF::XTY_ER)
|
|
setAlignment(Align(DefaultAlignVal));
|
|
}
|
|
|
|
void printCsectDirective(raw_ostream &OS) const;
|
|
|
|
public:
|
|
~MCSectionXCOFF();
|
|
|
|
static bool classof(const MCSection *S) {
|
|
return S->getVariant() == SV_XCOFF;
|
|
}
|
|
|
|
XCOFF::StorageMappingClass getMappingClass() const { return MappingClass; }
|
|
XCOFF::StorageClass getStorageClass() const {
|
|
return QualName->getStorageClass();
|
|
}
|
|
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;
|
|
StringRef getSymbolTableName() const { return SymbolTableName; }
|
|
bool isMultiSymbolsAllowed() const { return MultiSymbolsAllowed; }
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|