[MC/AsmParser] Avoid setting MCSymbol.IsUsed in some cases

[oota-llvm.git] / include / llvm / MC / MCSectionCOFF.h

diff --git a/include/llvm/MC/MCSectionCOFF.h b/include/llvm/MC/MCSectionCOFF.h
index 50e33a5b040aff563681c9606b639210a4589726..237f6d31fb1b054be1c95a76a70324368230c904 100644 (file)
--- a/include/llvm/MC/MCSectionCOFF.h
+++ b/include/llvm/MC/MCSectionCOFF.h
@@ -19,30 +19,41 @@
 #include "llvm/Support/COFF.h"
 
 namespace llvm {
+class MCSymbol;
 
 /// MCSectionCOFF - This represents a section on Windows
   class MCSectionCOFF : public MCSection {
     // The memory for this string is stored in the same MCContext as *this.
     StringRef SectionName;
 
+    // FIXME: The following fields should not be mutable, but are for now so
+    // the asm parser can honor the .linkonce directive.
+
     /// Characteristics - This is the Characteristics field of a section,
-    //  drawn from the enums below.
-    unsigned Characteristics;
+    /// drawn from the enums below.
+    mutable unsigned Characteristics;
+
+    /// The COMDAT symbol of this section. Only valid if this is a COMDAT
+    /// section. Two COMDAT sections are merged if they have the same
+    /// COMDAT symbol.
+    MCSymbol *COMDATSymbol;
 
     /// Selection - This is the Selection field for the section symbol, if
     /// it is a COMDAT section (Characteristics & IMAGE_SCN_LNK_COMDAT) != 0
-    int Selection;
+    mutable int Selection;
 
   private:
     friend class MCContext;
     MCSectionCOFF(StringRef Section, unsigned Characteristics,
-                  int Selection, SectionKind K)
-      : MCSection(SV_COFF, K), SectionName(Section),
-        Characteristics(Characteristics), Selection (Selection) {
+                  MCSymbol *COMDATSymbol, int Selection, SectionKind K,
+                  MCSymbol *Begin)
+        : MCSection(SV_COFF, K, Begin), SectionName(Section),
+          Characteristics(Characteristics), COMDATSymbol(COMDATSymbol),
+          Selection(Selection) {
       assert ((Characteristics & 0x00F00000) == 0 &&
         "alignment must not be set upon section creation");
     }
-    ~MCSectionCOFF();
+    ~MCSectionCOFF() override;
 
   public:
     /// ShouldOmitSectionDirective - Decides whether a '.section' directive
@@ -50,20 +61,16 @@ namespace llvm {
     bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
 
     StringRef getSectionName() const { return SectionName; }
-    virtual std::string getLabelBeginName() const {
-      return SectionName.str() + "_begin";
-    }
-    virtual std::string getLabelEndName() const {
-      return SectionName.str() + "_end";
-    }
     unsigned getCharacteristics() const { return Characteristics; }
-    int getSelection () const { return Selection; }
+    MCSymbol *getCOMDATSymbol() const { return COMDATSymbol; }
+    int getSelection() const { return Selection; }
+
+    void setSelection(int Selection) const;
 
-    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
-                                      raw_ostream &OS,
-                                      const MCExpr *Subsection) const;
-    virtual bool UseCodeAlign() const;
-    virtual bool isVirtualSection() const;
+    void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
+                              const MCExpr *Subsection) const override;
+    bool UseCodeAlign() const override;
+    bool isVirtualSection() const override;
 
     static bool classof(const MCSection *S) {
       return S->getVariant() == SV_COFF;