llvm-6502/include/llvm/MC/MCSectionCOFF.h
2013-07-06 12:13:10 +00:00

90 lines
3.3 KiB
C++

//===- MCSectionCOFF.h - COFF 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 MCSectionCOFF class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONCOFF_H
#define LLVM_MC_MCSECTIONCOFF_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCSection.h"
#include "llvm/Support/COFF.h"
namespace llvm {
/// MCSectionCOFF - This represents a section on Windows
class MCSectionCOFF : public MCSection {
// The memory for this string is stored in the same MCContext as *this.
StringRef SectionName;
// FIXME: The following fields should not be mutable, but are for now so
// the asm parser can honor the .linkonce directive.
/// Characteristics - This is the Characteristics field of a section,
/// drawn from the enums below.
mutable unsigned Characteristics;
/// Selection - This is the Selection field for the section symbol, if
/// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
mutable int Selection;
/// Assoc - This is name of the associated section, if it is a COMDAT
/// section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0 with an
/// associative Selection (IMAGE_COMDAT_SELECT_ASSOCIATIVE).
mutable const MCSectionCOFF *Assoc;
private:
friend class MCContext;
MCSectionCOFF(StringRef Section, unsigned Characteristics,
int Selection, const MCSectionCOFF *Assoc, SectionKind K)
: MCSection(SV_COFF, K), SectionName(Section),
Characteristics(Characteristics), Selection(Selection), Assoc(Assoc) {
assert ((Characteristics & 0x00F00000) == 0 &&
"alignment must not be set upon section creation");
assert ((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
(Assoc != 0) &&
"associative COMDAT section must have an associated section");
}
~MCSectionCOFF();
public:
/// ShouldOmitSectionDirective - Decides whether a '.section' directive
/// should be printed before the section name
bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
StringRef getSectionName() const { return SectionName; }
virtual std::string getLabelBeginName() const {
return SectionName.str() + "_begin";
}
virtual std::string getLabelEndName() const {
return SectionName.str() + "_end";
}
unsigned getCharacteristics() const { return Characteristics; }
int getSelection() const { return Selection; }
const MCSectionCOFF *getAssocSection() const { return Assoc; }
void setSelection(int Selection, const MCSectionCOFF *Assoc = 0) const;
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS,
const MCExpr *Subsection) const;
virtual bool UseCodeAlign() const;
virtual bool isVirtualSection() const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_COFF;
}
};
} // end namespace llvm
#endif