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