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https://github.com/c64scene-ar/llvm-6502.git
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72935dd909
This is the first step to fix pr17918. It extends the .section directive a bit, inspired by what the ELF one looks like. The problem with using linkonce is that given .section foo .linkonce.... .section foo .linkonce we would already have switched sections when getting to .linkonce. The cleanest solution seems to be to add the comdat information in the .section itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195148 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
3.6 KiB
C++
98 lines
3.6 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/ADT/StringRef.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/Support/COFF.h"
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namespace llvm {
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class MCSymbol;
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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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// FIXME: The following fields should not be mutable, but are for now so
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// the asm parser can honor the .linkonce directive.
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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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mutable unsigned Characteristics;
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/// The COMDAT symbol of this section. Only valid if this is a COMDAT
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/// section. Two COMDAT sections are merged if they have the same
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/// COMDAT symbol.
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const MCSymbol *COMDATSymbol;
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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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mutable int Selection;
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/// Assoc - This is name of the associated section, if it is a COMDAT
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/// section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0 with an
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/// associative Selection (IMAGE_COMDAT_SELECT_ASSOCIATIVE).
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mutable const MCSectionCOFF *Assoc;
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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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const MCSymbol *COMDATSymbol, int Selection,
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const MCSectionCOFF *Assoc, SectionKind K)
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: MCSection(SV_COFF, K), SectionName(Section),
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Characteristics(Characteristics), COMDATSymbol(COMDATSymbol),
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Selection(Selection), Assoc(Assoc) {
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assert ((Characteristics & 0x00F00000) == 0 &&
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"alignment must not be set upon section creation");
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assert ((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
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(Assoc != 0) &&
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"associative COMDAT section must have an associated section");
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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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StringRef getSectionName() const { return SectionName; }
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virtual std::string getLabelBeginName() const {
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return SectionName.str() + "_begin";
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}
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virtual std::string getLabelEndName() const {
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return SectionName.str() + "_end";
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}
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unsigned getCharacteristics() const { return Characteristics; }
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int getSelection() const { return Selection; }
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const MCSectionCOFF *getAssocSection() const { return Assoc; }
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void setSelection(int Selection, const MCSectionCOFF *Assoc = 0) const;
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virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS,
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const MCExpr *Subsection) const;
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virtual bool UseCodeAlign() const;
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virtual bool isVirtualSection() 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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};
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} // end namespace llvm
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#endif
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