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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
//===- MCSectionCOFF.h - COFF Machine Code Sections -------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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