Remove yet another method of creating begin and end symbol for sections.

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

diff --git a/include/llvm/MC/MCSection.h b/include/llvm/MC/MCSection.h
index 5c997357c9d3818db320a29d5940760009a33b57..55270a5f9ef2e3eafd506f128a690306c6c08b08 100644 (file)
--- a/include/llvm/MC/MCSection.h
+++ b/include/llvm/MC/MCSection.h
@@ -14,55 +14,62 @@
 #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/Casting.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm {
-  class MCContext;
-  class MCAsmInfo;
-  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 {
-  public:
-    enum SectionVariant {
-      SV_COFF = 0,
-      SV_ELF,
-      SV_MachO,
-      SV_PIC16
-    };
-
-  private:
-    MCSection(const MCSection&);      // DO NOT IMPLEMENT
-    void operator=(const MCSection&); // DO NOT IMPLEMENT
-  protected:
-    MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
-    SectionVariant Variant;
-    SectionKind Kind;
-  public:
-    virtual ~MCSection();
-
-    SectionKind getKind() const { return Kind; }
-
-    SectionVariant getVariant() const { return Variant; }
-
-    virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
-                                      raw_ostream &OS) 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;
-    }
-
-    static bool classof(const MCSection *) { return true; }
-  };
+class MCAsmInfo;
+class MCContext;
+class MCExpr;
+class MCSymbol;
+class raw_ostream;
+
+/// 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 {
+public:
+  enum SectionVariant { SV_COFF = 0, SV_ELF, SV_MachO };
+
+private:
+  MCSection(const MCSection &) = delete;
+  void operator=(const MCSection &) = delete;
+
+  mutable MCSymbol *Begin;
+  mutable MCSymbol *End;
+
+protected:
+  MCSection(SectionVariant V, SectionKind K, MCSymbol *Begin)
+      : Begin(Begin), End(nullptr), Variant(V), Kind(K) {}
+  SectionVariant Variant;
+  SectionKind Kind;
+
+public:
+  virtual ~MCSection();
+
+  SectionKind getKind() const { return Kind; }
+
+  SectionVariant getVariant() const { return Variant; }
+
+  MCSymbol *getBeginSymbol() const { return Begin; }
+  void setBeginSymbol(MCSymbol *Sym) const {
+    assert(!Begin);
+    Begin = Sym;
+  }
+  MCSymbol *getEndSymbol(MCContext &Ctx) const;
+  bool hasEnded() const;
+
+  virtual void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS,
+                                    const MCExpr *Subsection) const = 0;
+
+  /// Return true if a .align directive should use "optimized nops" to fill
+  /// instead of 0s.
+  virtual bool UseCodeAlign() const = 0;
+
+  /// Check whether this section is "virtual", that is has no actual object
+  /// file contents.
+  virtual bool isVirtualSection() const = 0;
+};
 
 } // end namespace llvm