1 //===- MCSectionCOFF.h - COFF Machine Code Sections -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the MCSectionCOFF class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCSECTIONCOFF_H
15 #define LLVM_MC_MCSECTIONCOFF_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/MC/MCSection.h"
19 #include "llvm/Support/COFF.h"
23 /// MCSectionCOFF - This represents a section on Windows
24 class MCSectionCOFF : public MCSection {
25 // The memory for this string is stored in the same MCContext as *this.
26 StringRef SectionName;
28 // FIXME: The following fields should not be mutable, but are for now so
29 // the asm parser can honor the .linkonce directive.
31 /// Characteristics - This is the Characteristics field of a section,
32 /// drawn from the enums below.
33 mutable unsigned Characteristics;
35 /// Selection - This is the Selection field for the section symbol, if
36 /// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
37 mutable int Selection;
39 /// Assoc - This is name of the associated section, if it is a COMDAT
40 /// section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0 with an
41 /// associative Selection (IMAGE_COMDAT_SELECT_ASSOCIATIVE).
42 mutable const MCSectionCOFF *Assoc;
45 friend class MCContext;
46 MCSectionCOFF(StringRef Section, unsigned Characteristics,
47 int Selection, const MCSectionCOFF *Assoc, SectionKind K)
48 : MCSection(SV_COFF, K), SectionName(Section),
49 Characteristics(Characteristics), Selection(Selection), Assoc(Assoc) {
50 assert ((Characteristics & 0x00F00000) == 0 &&
51 "alignment must not be set upon section creation");
52 assert ((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
54 "associative COMDAT section must have an associated section");
59 /// ShouldOmitSectionDirective - Decides whether a '.section' directive
60 /// should be printed before the section name
61 bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
63 StringRef getSectionName() const { return SectionName; }
64 virtual std::string getLabelBeginName() const {
65 return SectionName.str() + "_begin";
67 virtual std::string getLabelEndName() const {
68 return SectionName.str() + "_end";
70 unsigned getCharacteristics() const { return Characteristics; }
71 int getSelection() const { return Selection; }
72 const MCSectionCOFF *getAssocSection() const { return Assoc; }
74 void setSelection(int Selection, const MCSectionCOFF *Assoc = 0) const;
76 virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
78 const MCExpr *Subsection) const;
79 virtual bool UseCodeAlign() const;
80 virtual bool isVirtualSection() const;
82 static bool classof(const MCSection *S) {
83 return S->getVariant() == SV_COFF;
87 } // end namespace llvm