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