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https://github.com/c64scene-ar/llvm-6502.git
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48486893f4
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8782 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
4.0 KiB
C++
98 lines
4.0 KiB
C++
//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- 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_TARGET_TARGETDATA_H
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#define LLVM_TARGET_TARGETDATA_H
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#include "llvm/Pass.h"
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#include "Support/Annotation.h"
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#include "Support/DataTypes.h"
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#include <vector>
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class Value;
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class Type;
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class StructType;
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class StructLayout;
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class TargetData : public ImmutablePass {
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bool LittleEndian; // Defaults to false
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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, const Annotable *, void *);
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public:
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TargetData(const std::string &TargetName = "",
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bool LittleEndian = false,
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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(const std::string &ToolName, const Module *M);
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~TargetData(); // Not virtual, do not subclass this class
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/// Target endianness...
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bool isLittleEndian() const { return LittleEndian; }
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bool isBigEndian() const { return !LittleEndian; }
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/// Target alignment constraints
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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 necessary to hold the specified
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// type
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uint64_t 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.
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//
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uint64_t getIndexedOffset(const Type *Ty,
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const std::vector<Value*> &Indices) const;
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inline const StructLayout *getStructLayout(const StructType *Ty) const {
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return (const StructLayout*)
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((const Annotable*)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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std::vector<uint64_t> MemberOffsets;
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uint64_t 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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