X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FMC%2FMCSection.h;h=8aec9c82e3281c19f264f13d3101d3cec967bc4c;hb=66981fe20809820e30dc19ea37ff7487eb67a96f;hp=bdc46be11d5d2527f8193c7ca4e63cd362a62c80;hpb=f9650c061ee89ac55740555530ca5c2842c28738;p=oota-llvm.git

diff --git a/include/llvm/MC/MCSection.h b/include/llvm/MC/MCSection.h
index bdc46be11d5..8aec9c82e32 100644
--- a/include/llvm/MC/MCSection.h
+++ b/include/llvm/MC/MCSection.h
@@ -14,47 +14,66 @@
 #ifndef LLVM_MC_MCSECTION_H
 #define LLVM_MC_MCSECTION_H
 
-#include <string>
 #include "llvm/ADT/StringRef.h"
 #include "llvm/MC/SectionKind.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm {
-  class MCContext;
-  
+  class MCAsmInfo;
+  class MCExpr;
+  class raw_ostream;
+
   /// MCSection - Instances of this class represent a uniqued identifier for a
   /// section in the current translation unit.  The MCContext class uniques and
   /// creates these.
   class MCSection {
-    std::string Name;
-    
-    /// IsDirective - This is true if the section name is a directive, not
-    /// something that should be printed with ".section".
-    ///
-    /// FIXME: This is a hack.  Switch to a semantic view of the section instead
-    /// of a syntactic one.
-    bool IsDirective;
-    
-    MCSection(const MCSection&);      // DO NOT IMPLEMENT
-    void operator=(const MCSection&); // DO NOT IMPLEMENT
+  public:
+    enum SectionVariant {
+      SV_COFF = 0,
+      SV_ELF,
+      SV_MachO
+    };
+
+  private:
+    MCSection(const MCSection&) = delete;
+    void operator=(const MCSection&) = delete;
   protected:
-    MCSection(const StringRef &Name, bool IsDirective, SectionKind K,
-              MCContext &Ctx);
+    MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
+    SectionVariant Variant;
     SectionKind Kind;
   public:
     virtual ~MCSection();
 
-    static MCSection *Create(const StringRef &Name, bool IsDirective, 
-                             SectionKind K, MCContext &Ctx);
-    
-    const std::string &getName() const { return Name; }
-    bool isDirective() const { return IsDirective; }
-    
     SectionKind getKind() const { return Kind; }
+
+    SectionVariant getVariant() const { return Variant; }
+
+    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
+                                      raw_ostream &OS,
+                                      const MCExpr *Subsection) const = 0;
+
+    // Convenience routines to get label names for the beginning/end of a
+    // section.
+    virtual std::string getLabelBeginName() const = 0;
+    virtual std::string getLabelEndName() const = 0;
+
+    /// isBaseAddressKnownZero - Return true if we know that this section will
+    /// get a base address of zero.  In cases where we know that this is true we
+    /// can emit section offsets as direct references to avoid a subtraction
+    /// from the base of the section, saving a relocation.
+    virtual bool isBaseAddressKnownZero() const {
+      return false;
+    }
+
+    // UseCodeAlign - Return true if a .align directive should use
+    // "optimized nops" to fill instead of 0s.
+    virtual bool UseCodeAlign() const = 0;
+
+    /// isVirtualSection - Check whether this section is "virtual", that is
+    /// has no actual object file contents.
+    virtual bool isVirtualSection() const = 0;
   };
 
-  
-  typedef MCSection MCSectionELF;
-  
 } // end namespace llvm
 
 #endif