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101 lines
3.4 KiB
C++
101 lines
3.4 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/ADT/StringRef.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/SectionKind.h"
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#include <cassert>
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namespace llvm {
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class MCSymbol;
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/// This represents a section on Windows
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class MCSectionCOFF final : 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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// FIXME: The following fields should not be mutable, but are for now so the
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// asm parser can honor the .linkonce directive.
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/// This is the Characteristics field of a section, drawn from the enums
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/// below.
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mutable unsigned Characteristics;
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/// The unique IDs used with the .pdata and .xdata sections created internally
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/// by the assembler. This ID is used to ensure that for every .text section,
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/// there is exactly one .pdata and one .xdata section, which is required by
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/// the Microsoft incremental linker. This data is mutable because this ID is
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/// not notionally part of the section.
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mutable unsigned WinCFISectionID = ~0U;
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/// The COMDAT symbol of this section. Only valid if this is a COMDAT section.
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/// Two COMDAT sections are merged if they have the same COMDAT symbol.
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MCSymbol *COMDATSymbol;
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/// This is the Selection field for the section symbol, if it is a COMDAT
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/// section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
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mutable 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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MCSymbol *COMDATSymbol, int Selection, SectionKind K,
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MCSymbol *Begin)
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: MCSection(SV_COFF, K, Begin), SectionName(Section),
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Characteristics(Characteristics), COMDATSymbol(COMDATSymbol),
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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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public:
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~MCSectionCOFF();
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/// Decides whether a '.section' directive should be printed before the
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/// section name
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bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
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StringRef getSectionName() const { return SectionName; }
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unsigned getCharacteristics() const { return Characteristics; }
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MCSymbol *getCOMDATSymbol() const { return COMDATSymbol; }
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int getSelection() const { return Selection; }
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void setSelection(int Selection) const;
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void PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
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raw_ostream &OS,
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const MCExpr *Subsection) const override;
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bool UseCodeAlign() const override;
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bool isVirtualSection() const override;
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unsigned getOrAssignWinCFISectionID(unsigned *NextID) const {
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if (WinCFISectionID == ~0U)
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WinCFISectionID = (*NextID)++;
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return WinCFISectionID;
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}
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static bool isImplicitlyDiscardable(StringRef Name) {
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return Name.startswith(".debug");
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}
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static bool classof(const MCSection *S) { return S->getVariant() == SV_COFF; }
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};
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} // end namespace llvm
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#endif // LLVM_MC_MCSECTIONCOFF_H
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