1 //===- MCSectionCOFF.h - COFF Machine Code Sections -------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file declares the MCSectionCOFF class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_MC_MCSECTIONCOFF_H 15 #define LLVM_MC_MCSECTIONCOFF_H 16 17 #include "llvm/ADT/StringRef.h" 18 #include "llvm/MC/MCSection.h" 19 20 namespace llvm { 21 class MCSymbol; 22 23 /// This represents a section on Windows 24 class MCSectionCOFF final : public MCSection { 25 // The memory for this string is stored in the same MCContext as *this. 26 StringRef SectionName; 27 28 // FIXME: The following fields should not be mutable, but are for now so the 29 // asm parser can honor the .linkonce directive. 30 31 /// This is the Characteristics field of a section, drawn from the enums 32 /// below. 33 mutable unsigned Characteristics; 34 35 /// The COMDAT symbol of this section. Only valid if this is a COMDAT section. 36 /// Two COMDAT sections are merged if they have the same COMDAT symbol. 37 MCSymbol *COMDATSymbol; 38 39 /// This is the Selection field for the section symbol, if it is a COMDAT 40 /// section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0 41 mutable int Selection; 42 43 private: 44 friend class MCContext; 45 MCSectionCOFF(StringRef Section, unsigned Characteristics, 46 MCSymbol *COMDATSymbol, int Selection, SectionKind K, 47 MCSymbol *Begin) 48 : MCSection(SV_COFF, K, Begin), SectionName(Section), 49 Characteristics(Characteristics), COMDATSymbol(COMDATSymbol), 50 Selection(Selection) { 51 assert((Characteristics & 0x00F00000) == 0 && 52 "alignment must not be set upon section creation"); 53 } 54 55 public: 56 ~MCSectionCOFF(); 57 58 /// Decides whether a '.section' directive should be printed before the 59 /// section name 60 bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 61 62 StringRef getSectionName() const { return SectionName; } 63 unsigned getCharacteristics() const { return Characteristics; } 64 MCSymbol *getCOMDATSymbol() const { return COMDATSymbol; } 65 int getSelection() const { return Selection; } 66 67 void setSelection(int Selection) const; 68 69 void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS, 70 const MCExpr *Subsection) const override; 71 bool UseCodeAlign() const override; 72 bool isVirtualSection() const override; 73 74 static bool classof(const MCSection *S) { return S->getVariant() == SV_COFF; } 75 }; 76 77 } // end namespace llvm 78 79 #endif 80