1 files changed, 85 insertions, 0 deletions
diff --git a/include/llvm/Target/Data.h b/include/llvm/Target/Data.h
new file mode 100644
index 0000000000..55739503e7
--- /dev/null
+++ b/include/llvm/Target/Data.h
@@ -0,0 +1,85 @@
+//===-- llvm/Target/Data.h - Data size & alignment routines ------*- C++ -*-==//
+//
+// This file defines target properties related to datatype size/offset/alignment
+// information.  It uses lazy annotations to cache information about how 
+// structure types are laid out and used.
+//
+// This structure should be created once, filled in if the defaults are not
+// correct and then passed around by const&.  None of the members functions
+// require modification to the object.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_DATA_H
+#define LLVM_TARGET_DATA_H
+
+#include "llvm/Type.h"
+#include <vector>
+
+class StructType;
+class StructLayout;
+
+class TargetData {
+  unsigned char ByteAlignment;         // Defaults to 1 bytes
+  unsigned char ShortAlignment;        // Defaults to 2 bytes
+  unsigned char IntAlignment;          // Defaults to 4 bytes
+  unsigned char LongAlignment;         // Defaults to 8 bytes
+  unsigned char FloatAlignment;        // Defaults to 4 bytes
+  unsigned char DoubleAlignment;       // Defaults to 8 bytes
+  unsigned char PointerSize;           // Defaults to 8 bytes
+  unsigned char PointerAlignment;      // Defaults to 8 bytes
+  AnnotationID  AID;                   // AID for structure layout annotation
+ 
+  static Annotation *TypeAnFactory(AnnotationID, const Annotable *, void *);
+public:
+  TargetData(const string &TargetName, unsigned char PtrSize = 8,
+	     unsigned char PtrAl = 8, unsigned char DoubleAl = 8,
+	     unsigned char FloatAl = 4, unsigned char LongAl = 8, 
+	     unsigned char IntAl = 4, unsigned char ShortAl = 2,
+	     unsigned char ByteAl = 1);
+  ~TargetData();  // Not virtual, do not subclass this class
+
+  unsigned char getByteAlignment()    const { return    ByteAlignment; }
+  unsigned char getShortAlignment()   const { return   ShortAlignment; }
+  unsigned char getIntAlignment()     const { return     IntAlignment; }
+  unsigned char getLongAlignment()    const { return    LongAlignment; }
+  unsigned char getFloatAlignment()   const { return   FloatAlignment; }
+  unsigned char getDoubleAlignment()  const { return  DoubleAlignment; }
+  unsigned char getPointerAlignment() const { return PointerAlignment; }
+  unsigned char getPointerSize()      const { return PointerSize; }
+  AnnotationID  getStructLayoutAID()  const { return AID; }
+
+  // getTypeSize - Return the number of bytes neccesary to hold the specified
+  // type
+  unsigned      getTypeSize     (const Type *Ty) const;
+
+  // getTypeAlignment - Return the minimum required alignment for the specified
+  // type
+  unsigned char getTypeAlignment(const Type *Ty) const;
+
+  // getIndexOffset - return the offset from the beginning of the type for the
+  // specified indices.  This is used to implement getElementPtr and load and 
+  // stores that include the implicit form of getelementptr.
+  //
+  unsigned      getIndexedOffset(const Type *Ty, 
+				 const vector<ConstPoolVal*> &Indices) const;
+
+  inline const StructLayout *getStructLayout(const StructType *Ty) const {
+    return (const StructLayout*)((const Type*)Ty)->getOrCreateAnnotation(AID);
+  }
+};
+
+// This annotation (attached ONLY to StructType classes) is used to lazily
+// calculate structure layout information for a target machine, based on the
+// TargetData structure.
+//
+struct StructLayout : public Annotation {
+  vector<unsigned> MemberOffsets;
+  unsigned StructSize;
+  unsigned StructAlignment;
+private:
+  friend class TargetData;   // Only TargetData can create this class
+  inline StructLayout(const StructType *ST, const TargetData &TD);
+};
+
+#endif