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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31173 91177308-0d34-0410-b5e6-96231b3b80d8
175 lines
6.6 KiB
C++
175 lines
6.6 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 "llvm/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 GlobalVariable;
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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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/// Default ctor - This has to exist, because this is a pass, but it should
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/// never be used.
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TargetData() {
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assert(0 && "ERROR: Bad TargetData ctor used. "
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"Tool did not specify a TargetData to use?");
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abort();
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}
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/// Constructs a TargetData from a string of the following format:
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/// "E-p:64:64-d:64-f:32-l:64-i:32-s:16-b:8-B:8"
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/// The above string is considered the default, and any values not specified
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/// in the string will be assumed to be as above.
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TargetData(const std::string &TargetDescription) {
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init(TargetDescription);
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}
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/// Initialize target data from properties stored in the module.
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TargetData(const Module *M);
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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(); // Not virtual, do not subclass this class
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/// init - Specify configuration if not available at ctor time.
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///
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void init(const std::string &TargetDescription);
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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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unsigned char getPointerSizeInBits() const { return 8*PointerSize; }
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/// getStringRepresentation - Return the string representation of the
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/// TargetData. This representation is in the same format accepted by the
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/// string constructor above.
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std::string getStringRepresentation() const;
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/// getTypeSize - Return the number of bytes necessary to hold the specified
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/// type.
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///
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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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///
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unsigned char getTypeAlignment(const Type *Ty) const;
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/// getTypeAlignmentShift - Return the minimum required alignment for the
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/// specified type, returned as log2 of the value (a shift amount).
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///
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unsigned char getTypeAlignmentShift(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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///
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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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/// getStructLayout - Return a StructLayout object, indicating the alignment
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/// of the struct, its size, and the offsets of its fields. Note that this
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/// information is lazily cached.
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const StructLayout *getStructLayout(const StructType *Ty) const;
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/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout
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/// objects. If a TargetData object is alive when types are being refined and
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/// removed, this method must be called whenever a StructType is removed to
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/// avoid a dangling pointer in this cache.
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void InvalidateStructLayoutInfo(const StructType *Ty) const;
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/// getPreferredAlignmentLog - Return the preferred alignment of the
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/// specified global, returned in log form. This includes an explicitly
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/// requested alignment (if the global has one).
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unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const;
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};
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/// StructLayout - 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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class StructLayout {
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public:
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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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/// getElementContainingOffset - Given a valid offset into the structure,
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/// return the structure index that contains it.
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///
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unsigned getElementContainingOffset(uint64_t Offset) const;
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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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