MCSectionGOFF.h

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//===-- llvm/MC/MCSectionGOFF.h - GOFF 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file declares the MCSectionGOFF class, which contains all of the
/// necessary machine code sections for the GOFF file format.
///
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_MC_MCSECTIONGOFF_H
#define LLVM_MC_MCSECTIONGOFF_H
 
#include "llvm/BinaryFormat/GOFF.h"
#include "llvm/MC/MCGOFFAttributes.h"
#include "llvm/MC/MCSection.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
 
namespace llvm {
 
class MCExpr;
 
class LLVM_ABI MCSectionGOFF final : public MCSection {
  StringRef ExternalName; // Alternate external name.
 
  // Parent of this section. Implies that the parent is emitted first.
  MCSectionGOFF *Parent;
 
  // The attributes of the GOFF symbols.
  union {
    GOFF::SDAttr SDAttributes;
    GOFF::EDAttr EDAttributes;
    GOFF::PRAttr PRAttributes;
  };
 
  // The type of this section.
  GOFF::ESDSymbolType SymbolType;
 
  // This section is a BSS section.
  unsigned IsBSS : 1;
 
  // Indicates that the PR symbol needs to set the length of the section to a
  // non-zero value. This is only a problem with the ADA PR - the binder will
  // generate an error in this case.
  unsigned RequiresNonZeroLength : 1;
 
  // Set to true if the section definition was already emitted.
  mutable unsigned Emitted : 1;
 
  friend class MCContext;
  friend class MCAsmInfoGOFF;
  friend class MCSymbolGOFF;
 
  MCSectionGOFF(StringRef Name, SectionKind K, bool IsVirtual,
                GOFF::SDAttr SDAttributes, MCSectionGOFF *Parent)
      : MCSection(Name, K.isText(), IsVirtual, nullptr), Parent(Parent),
        SDAttributes(SDAttributes), SymbolType(GOFF::ESD_ST_SectionDefinition),
        IsBSS(K.isBSS()), RequiresNonZeroLength(0), Emitted(0) {}
 
  MCSectionGOFF(StringRef Name, SectionKind K, bool IsVirtual,
                GOFF::EDAttr EDAttributes, MCSectionGOFF *Parent)
      : MCSection(Name, K.isText(), IsVirtual, nullptr), Parent(Parent),
        EDAttributes(EDAttributes), SymbolType(GOFF::ESD_ST_ElementDefinition),
        IsBSS(K.isBSS()), RequiresNonZeroLength(0), Emitted(0) {}
 
  MCSectionGOFF(StringRef Name, SectionKind K, bool IsVirtual,
                GOFF::PRAttr PRAttributes, MCSectionGOFF *Parent)
      : MCSection(Name, K.isText(), IsVirtual, nullptr), Parent(Parent),
        PRAttributes(PRAttributes), SymbolType(GOFF::ESD_ST_PartReference),
        IsBSS(K.isBSS()), RequiresNonZeroLength(0), Emitted(0) {}
 
public:
  // Return the parent section.
  MCSectionGOFF *getParent() const { return Parent; }
 
  // Returns true if this is a BSS section.
  bool isBSS() const { return IsBSS; }
 
  // Returns the type of this section.
  GOFF::ESDSymbolType getSymbolType() const { return SymbolType; }
 
  bool isSD() const { return SymbolType == GOFF::ESD_ST_SectionDefinition; }
  bool isED() const { return SymbolType == GOFF::ESD_ST_ElementDefinition; }
  bool isPR() const { return SymbolType == GOFF::ESD_ST_PartReference; }
 
  // Accessors to the attributes.
  GOFF::SDAttr getSDAttributes() const {
    assert(isSD() && "Not a SD section");
    return SDAttributes;
  }
  GOFF::EDAttr getEDAttributes() const {
    assert(isED() && "Not a ED section");
    return EDAttributes;
  }
  GOFF::PRAttr getPRAttributes() const {
    assert(isPR() && "Not a PR section");
    return PRAttributes;
  }
 
  // Returns the text style for a section. Only defined for ED and PR sections.
  GOFF::ESDTextStyle getTextStyle() const {
    assert((isED() || isPR() || isBssSection()) && "Expect ED or PR section");
    if (isED())
      return EDAttributes.TextStyle;
    if (isPR())
      return getParent()->getEDAttributes().TextStyle;
    // Virtual sections have no data, so byte orientation is fine.
    return GOFF::ESD_TS_ByteOriented;
  }
 
  bool requiresNonZeroLength() const { return RequiresNonZeroLength; }
 
  void setName(StringRef SectionName) { Name = SectionName; }
 
  bool hasExternalName() const { return !ExternalName.empty(); }
  void setExternalName(StringRef Name) { ExternalName = Name; }
  StringRef getExternalName() const {
    return hasExternalName() ? ExternalName : getName();
  }
};
} // end namespace llvm
 
#endif