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//===- MCSection.h - Machine Code Sections ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the MCSection class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTION_H
#define LLVM_MC_MCSECTION_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class MCAsmInfo;
class MCExpr;
class raw_ostream;
/// MCSection - Instances of this class represent a uniqued identifier for a
/// section in the current translation unit. The MCContext class uniques and
/// creates these.
class MCSection {
public:
enum SectionVariant {
SV_COFF = 0,
SV_ELF,
SV_MachO
};
private:
MCSection(const MCSection&) = delete;
void operator=(const MCSection&) = delete;
protected:
MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
SectionVariant Variant;
SectionKind Kind;
public:
virtual ~MCSection();
SectionKind getKind() const { return Kind; }
SectionVariant getVariant() const { return Variant; }
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS,
const MCExpr *Subsection) const = 0;
// Convenience routines to get label names for the beginning/end of a
// section.
virtual std::string getLabelBeginName() const = 0;
virtual std::string getLabelEndName() const = 0;
/// isBaseAddressKnownZero - Return true if we know that this section will
/// get a base address of zero. In cases where we know that this is true we
/// can emit section offsets as direct references to avoid a subtraction
/// from the base of the section, saving a relocation.
virtual bool isBaseAddressKnownZero() const {
return false;
}
// UseCodeAlign - Return true if a .align directive should use
// "optimized nops" to fill instead of 0s.
virtual bool UseCodeAlign() const = 0;
/// isVirtualSection - Check whether this section is "virtual", that is
/// has no actual object file contents.
virtual bool isVirtualSection() const = 0;
};
} // end namespace llvm
#endif
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