Fix comment not allowed in C90

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

diff --git a/include/llvm/MC/MCSymbolMachO.h b/include/llvm/MC/MCSymbolMachO.h
index b7f85411d80dbd5f4f92830cbca467134242ed63..5b0321fe9f732d5c94d78ade7b2e04a511792d25 100644 (file)
--- a/include/llvm/MC/MCSymbolMachO.h
+++ b/include/llvm/MC/MCSymbolMachO.h
@@ -7,17 +7,115 @@
 //
 //===----------------------------------------------------------------------===//
 #ifndef LLVM_MC_MCSYMBOLMACHO_H
-#define setIsWeakExternal
+#define LLVM_MC_MCSYMBOLMACHO_H
 
 #include "llvm/MC/MCSymbol.h"
 
 namespace llvm {
 class MCSymbolMachO : public MCSymbol {
+  /// \brief We store the value for the 'desc' symbol field in the
+  /// lowest 16 bits of the implementation defined flags.
+  enum MachOSymbolFlags : uint16_t { // See <mach-o/nlist.h>.
+    SF_DescFlagsMask                        = 0xFFFF,
+
+    // Reference type flags.
+    SF_ReferenceTypeMask                    = 0x0007,
+    SF_ReferenceTypeUndefinedNonLazy        = 0x0000,
+    SF_ReferenceTypeUndefinedLazy           = 0x0001,
+    SF_ReferenceTypeDefined                 = 0x0002,
+    SF_ReferenceTypePrivateDefined          = 0x0003,
+    SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
+    SF_ReferenceTypePrivateUndefinedLazy    = 0x0005,
+
+    // Other 'desc' flags.
+    SF_ThumbFunc                            = 0x0008,
+    SF_NoDeadStrip                          = 0x0020,
+    SF_WeakReference                        = 0x0040,
+    SF_WeakDefinition                       = 0x0080,
+    SF_SymbolResolver                       = 0x0100,
+
+    // Common alignment
+    SF_CommonAlignmentMask                  = 0xF0FF,
+    SF_CommonAlignmentShift                 = 8
+  };
 
 public:
   MCSymbolMachO(const StringMapEntry<bool> *Name, bool isTemporary)
       : MCSymbol(SymbolKindMachO, Name, isTemporary) {}
 
+  // Reference type methods.
+
+  void clearReferenceType() const {
+    modifyFlags(0, SF_ReferenceTypeMask);
+  }
+
+  void setReferenceTypeUndefinedLazy(bool Value) const {
+    modifyFlags(Value ? SF_ReferenceTypeUndefinedLazy : 0,
+                SF_ReferenceTypeUndefinedLazy);
+  }
+
+  // Other 'desc' methods.
+
+  void setThumbFunc() const {
+    modifyFlags(SF_ThumbFunc, SF_ThumbFunc);
+  }
+
+  bool isNoDeadStrip() const {
+    return getFlags() & SF_NoDeadStrip;
+  }
+  void setNoDeadStrip() const {
+    modifyFlags(SF_NoDeadStrip, SF_NoDeadStrip);
+  }
+
+  bool isWeakReference() const {
+    return getFlags() & SF_WeakReference;
+  }
+  void setWeakReference() const {
+    modifyFlags(SF_WeakReference, SF_WeakReference);
+  }
+
+  bool isWeakDefinition() const {
+    return getFlags() & SF_WeakDefinition;
+  }
+  void setWeakDefinition() const {
+    modifyFlags(SF_WeakDefinition, SF_WeakDefinition);
+  }
+
+  bool isSymbolResolver() const {
+    return getFlags() & SF_SymbolResolver;
+  }
+  void setSymbolResolver() const {
+    modifyFlags(SF_SymbolResolver, SF_SymbolResolver);
+  }
+
+  void setDesc(unsigned Value) const {
+    assert(Value == (Value & SF_DescFlagsMask) &&
+           "Invalid .desc value!");
+    setFlags(Value & SF_DescFlagsMask);
+  }
+
+  /// \brief Get the encoded value of the flags as they will be emitted in to
+  /// the MachO binary
+  uint16_t getEncodedFlags() const {
+    uint16_t Flags = getFlags();
+
+    // Common alignment is packed into the 'desc' bits.
+    if (isCommon()) {
+      if (unsigned Align = getCommonAlignment()) {
+        unsigned Log2Size = Log2_32(Align);
+        assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
+        if (Log2Size > 15)
+          report_fatal_error("invalid 'common' alignment '" +
+                             Twine(Align) + "' for '" + getName() + "'",
+                             false);
+        Flags = (Flags & SF_CommonAlignmentMask) |
+                (Log2Size << SF_CommonAlignmentShift);
+      }
+    }
+
+    return Flags;
+  }
+
   static bool classof(const MCSymbol *S) { return S->isMachO(); }
 };
 }