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//===- 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/MC/MCSection.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;
/// Characteristics - This is the Characteristics field of a section,
// drawn from the enums below.
unsigned Characteristics;
/// Selection - This is the Selection field for the section symbol, if
/// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
int Selection;
private:
friend class MCContext;
MCSectionCOFF(StringRef Section, unsigned Characteristics,
int Selection, SectionKind K)
: MCSection(SV_COFF, K), SectionName(Section),
Characteristics(Characteristics), Selection (Selection) {
assert ((Characteristics & 0x00F00000) == 0 &&
"alignment must not be set upon section creation");
}
~MCSectionCOFF();
public:
/// ShouldOmitSectionDirective - Decides whether a '.section' directive
/// should be printed before the section name
bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
//FIXME: all COFF enumerations/flags should be standardized into one place...
// Target/X86COFF.h doesn't seem right as COFF can be used for other targets,
// MC/WinCOFF.h maybe right as it isn't target or entity specific, and it is
// pretty low on the dependancy graph (is there any need to support non
// windows COFF?)
// here is good for section stuff, but others should go elsewhere
/// Valid section flags.
enum {
IMAGE_SCN_TYPE_NO_PAD = 0x00000008,
IMAGE_SCN_CNT_CODE = 0x00000020,
IMAGE_SCN_CNT_INITIALIZED_DATA = 0x00000040,
IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080,
IMAGE_SCN_LNK_OTHER = 0x00000100,
IMAGE_SCN_LNK_INFO = 0x00000200,
IMAGE_SCN_LNK_REMOVE = 0x00000800,
IMAGE_SCN_LNK_COMDAT = 0x00001000,
IMAGE_SCN_MEM_FARDATA = 0x00008000,
IMAGE_SCN_MEM_PURGEABLE = 0x00020000,
IMAGE_SCN_MEM_16BIT = 0x00020000,
IMAGE_SCN_MEM_LOCKED = 0x00040000,
IMAGE_SCN_MEM_PRELOAD = 0x00080000,
/* these are handled elsewhere
IMAGE_SCN_ALIGN_1BYTES = 0x00100000,
IMAGE_SCN_ALIGN_2BYTES = 0x00200000,
IMAGE_SCN_ALIGN_4BYTES = 0x00300000,
IMAGE_SCN_ALIGN_8BYTES = 0x00400000,
IMAGE_SCN_ALIGN_16BYTES = 0x00500000,
IMAGE_SCN_ALIGN_32BYTES = 0x00600000,
IMAGE_SCN_ALIGN_64BYTES = 0x00700000,
*/
IMAGE_SCN_LNK_NRELOC_OVFL = 0x01000000,
IMAGE_SCN_MEM_DISCARDABLE = 0x02000000,
IMAGE_SCN_MEM_NOT_CACHED = 0x04000000,
IMAGE_SCN_MEM_NOT_PAGED = 0x08000000,
IMAGE_SCN_MEM_SHARED = 0x10000000,
IMAGE_SCN_MEM_EXECUTE = 0x20000000,
IMAGE_SCN_MEM_READ = 0x40000000,
IMAGE_SCN_MEM_WRITE = 0x80000000
};
enum {
IMAGE_COMDAT_SELECT_NODUPLICATES = 1,
IMAGE_COMDAT_SELECT_ANY,
IMAGE_COMDAT_SELECT_SAME_SIZE,
IMAGE_COMDAT_SELECT_EXACT_MATCH,
IMAGE_COMDAT_SELECT_ASSOCIATIVE,
IMAGE_COMDAT_SELECT_LARGEST
};
StringRef getSectionName() const { return SectionName; }
unsigned getCharacteristics() const { return Characteristics; }
int getSelection () const { return Selection; }
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_COFF;
}
static bool classof(const MCSectionCOFF *) { return true; }
};
} // end namespace llvm
#endif
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