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125 lines
4.8 KiB
C++
125 lines
4.8 KiB
C++
//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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/DataTypes.h"
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#include <vector>
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#include <string>
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namespace llvm {
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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 BoolAlignment; // Defaults to 1 byte
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unsigned char ByteAlignment; // Defaults to 1 byte
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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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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, unsigned char BoolAl = 1);
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// Copy constructor
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TargetData (const TargetData &TD) :
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ImmutablePass(),
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LittleEndian(TD.isLittleEndian()),
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BoolAlignment(TD.getBoolAlignment()),
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ByteAlignment(TD.getByteAlignment()),
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ShortAlignment(TD.getShortAlignment()),
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IntAlignment(TD.getIntAlignment()),
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LongAlignment(TD.getLongAlignment()),
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FloatAlignment(TD.getFloatAlignment()),
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DoubleAlignment(TD.getDoubleAlignment()),
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PointerSize(TD.getPointerSize()),
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PointerAlignment(TD.getPointerAlignment()) {
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}
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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 getBoolAlignment() const { return BoolAlignment; }
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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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/// 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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/// getIntPtrType - Return an unsigned integer type that is the same size or
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/// greater to the host pointer size.
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const Type *getIntPtrType() 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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const StructLayout *getStructLayout(const StructType *Ty) const;
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};
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// This object is used to lazily calculate structure layout information for a
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// target machine, based on the TargetData structure.
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//
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struct StructLayout {
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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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StructLayout(const StructType *ST, const TargetData &TD);
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};
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} // End llvm namespace
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#endif
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