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7e141838cd
- Of questionable utility, since in general anything which wants to do this should probably be within a target specific hook, which can rely on the sections being of the appropriate type. However, it can be useful for short term hacks. llvm-svn: 103980
116 lines
4.6 KiB
C++
116 lines
4.6 KiB
C++
//===- MCSectionCOFF.h - COFF 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 MCSectionCOFF class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTIONCOFF_H
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#define LLVM_MC_MCSECTIONCOFF_H
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#include "llvm/MC/MCSection.h"
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namespace llvm {
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/// MCSectionCOFF - This represents a section on Windows
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class MCSectionCOFF : public MCSection {
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// The memory for this string is stored in the same MCContext as *this.
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StringRef SectionName;
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/// Characteristics - This is the Characteristics field of a section,
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// drawn from the enums below.
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unsigned Characteristics;
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/// Selection - This is the Selection field for the section symbol, if
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/// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
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int Selection;
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private:
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friend class MCContext;
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MCSectionCOFF(StringRef Section, unsigned Characteristics,
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int Selection, SectionKind K)
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: MCSection(SV_COFF, K), SectionName(Section),
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Characteristics(Characteristics), Selection (Selection) {
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assert ((Characteristics & 0x00F00000) == 0 &&
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"alignment must not be set upon section creation");
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}
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~MCSectionCOFF();
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public:
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/// ShouldOmitSectionDirective - Decides whether a '.section' directive
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/// should be printed before the section name
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bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
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//FIXME: all COFF enumerations/flags should be standardized into one place...
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// Target/X86COFF.h doesn't seem right as COFF can be used for other targets,
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// MC/WinCOFF.h maybe right as it isn't target or entity specific, and it is
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// pretty low on the dependancy graph (is there any need to support non
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// windows COFF?)
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// here is good for section stuff, but others should go elsewhere
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/// Valid section flags.
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enum {
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IMAGE_SCN_TYPE_NO_PAD = 0x00000008,
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IMAGE_SCN_CNT_CODE = 0x00000020,
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IMAGE_SCN_CNT_INITIALIZED_DATA = 0x00000040,
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IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080,
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IMAGE_SCN_LNK_OTHER = 0x00000100,
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IMAGE_SCN_LNK_INFO = 0x00000200,
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IMAGE_SCN_LNK_REMOVE = 0x00000800,
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IMAGE_SCN_LNK_COMDAT = 0x00001000,
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IMAGE_SCN_MEM_FARDATA = 0x00008000,
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IMAGE_SCN_MEM_PURGEABLE = 0x00020000,
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IMAGE_SCN_MEM_16BIT = 0x00020000,
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IMAGE_SCN_MEM_LOCKED = 0x00040000,
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IMAGE_SCN_MEM_PRELOAD = 0x00080000,
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/* these are handled elsewhere
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IMAGE_SCN_ALIGN_1BYTES = 0x00100000,
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IMAGE_SCN_ALIGN_2BYTES = 0x00200000,
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IMAGE_SCN_ALIGN_4BYTES = 0x00300000,
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IMAGE_SCN_ALIGN_8BYTES = 0x00400000,
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IMAGE_SCN_ALIGN_16BYTES = 0x00500000,
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IMAGE_SCN_ALIGN_32BYTES = 0x00600000,
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IMAGE_SCN_ALIGN_64BYTES = 0x00700000,
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*/
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IMAGE_SCN_LNK_NRELOC_OVFL = 0x01000000,
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IMAGE_SCN_MEM_DISCARDABLE = 0x02000000,
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IMAGE_SCN_MEM_NOT_CACHED = 0x04000000,
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IMAGE_SCN_MEM_NOT_PAGED = 0x08000000,
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IMAGE_SCN_MEM_SHARED = 0x10000000,
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IMAGE_SCN_MEM_EXECUTE = 0x20000000,
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IMAGE_SCN_MEM_READ = 0x40000000,
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IMAGE_SCN_MEM_WRITE = 0x80000000
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};
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enum {
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IMAGE_COMDAT_SELECT_NODUPLICATES = 1,
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IMAGE_COMDAT_SELECT_ANY,
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IMAGE_COMDAT_SELECT_SAME_SIZE,
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IMAGE_COMDAT_SELECT_EXACT_MATCH,
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IMAGE_COMDAT_SELECT_ASSOCIATIVE,
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IMAGE_COMDAT_SELECT_LARGEST
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};
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StringRef getSectionName() const { return SectionName; }
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unsigned getCharacteristics() const { return Characteristics; }
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int getSelection () const { return Selection; }
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virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS) const;
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static bool classof(const MCSection *S) {
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return S->getVariant() == SV_COFF;
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}
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static bool classof(const MCSectionCOFF *) { return true; }
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};
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} // end namespace llvm
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#endif
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