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013321a0f9
* Section association cannot use just the section name as many sections can have the same name. With this patch, the comdat symbol in an assoc section is interpreted to mean a symbol in the associated section and the mapping is discovered from it. * Comdat symbols were not being set correctly. Instead we were getting whatever was output first for that section. A consequence is that associative sections now must use .section to set the association. Using .linkonce would not work since it is not possible to change a sections comdat symbol (it is used to decide if we should create a new section or reuse an existing one). This includes r210298, which was reverted because it was asserting on an associated section having the same comdat as the associated section. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210367 91177308-0d34-0410-b5e6-96231b3b80d8
88 lines
3.0 KiB
C++
88 lines
3.0 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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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, 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) {
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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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~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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std::string getLabelBeginName() const override {
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return SectionName.str() + "_begin";
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}
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std::string getLabelEndName() const override {
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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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const 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, 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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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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