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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36873 91177308-0d34-0410-b5e6-96231b3b80d8
244 lines
9.1 KiB
C++
244 lines
9.1 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 "llvm/ADT/SmallVector.h"
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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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/// Enum used to categorize the alignment types stored by TargetAlignElem
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enum AlignTypeEnum {
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INTEGER_ALIGN = 'i', ///< Integer type alignment
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VECTOR_ALIGN = 'v', ///< Vector type alignment
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FLOAT_ALIGN = 'f', ///< Floating point type alignment
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AGGREGATE_ALIGN = 'a' ///< Aggregate alignment
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};
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/// Target alignment element.
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///
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/// Stores the alignment data associated with a given alignment type (pointer,
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/// integer, packed/vector, float) and type bit width.
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///
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/// @note The unusual order of elements in the structure attempts to reduce
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/// padding and make the structure slightly more cache friendly.
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struct TargetAlignElem {
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AlignTypeEnum AlignType : 8; //< Alignment type (AlignTypeEnum)
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unsigned char ABIAlign; //< ABI alignment for this type/bitw
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unsigned char PrefAlign; //< Pref. alignment for this type/bitw
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uint32_t TypeBitWidth; //< Type bit width
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/// Initializer
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static TargetAlignElem get(AlignTypeEnum align_type, unsigned char abi_align,
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unsigned char pref_align, uint32_t bit_width);
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/// Equality predicate
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bool operator==(const TargetAlignElem &rhs) const;
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/// output stream operator
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std::ostream &dump(std::ostream &os) const;
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};
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class TargetData : public ImmutablePass {
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private:
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bool LittleEndian; ///< Defaults to false
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unsigned char PointerMemSize; ///< Pointer size in bytes
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unsigned char PointerABIAlign; ///< Pointer ABI alignment
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unsigned char PointerPrefAlign; ///< Pointer preferred alignment
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//! Where the primitive type alignment data is stored.
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/*!
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@sa init().
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@note Could support multiple size pointer alignments, e.g., 32-bit pointers
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vs. 64-bit pointers by extending TargetAlignment, but for now, we don't.
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*/
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SmallVector<TargetAlignElem, 16> Alignments;
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//! Alignment iterator shorthand
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typedef SmallVector<TargetAlignElem, 16>::iterator align_iterator;
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//! Constant alignment iterator shorthand
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typedef SmallVector<TargetAlignElem, 16>::const_iterator align_const_iterator;
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//! Invalid alignment.
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/*!
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This member is a signal that a requested alignment type and bit width were
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not found in the SmallVector.
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*/
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static const TargetAlignElem InvalidAlignmentElem;
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//! Set/initialize target alignments
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void setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
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unsigned char pref_align, uint32_t bit_width);
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unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
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bool ABIAlign) const;
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//! Internal helper method that returns requested alignment for type.
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unsigned char getAlignment(const Type *Ty, bool abi_or_pref) const;
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/// Valid alignment predicate.
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///
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/// Predicate that tests a TargetAlignElem reference returned by get() against
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/// InvalidAlignmentElem.
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inline bool validAlignment(const TargetAlignElem &align) const {
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return (&align != &InvalidAlignmentElem);
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}
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public:
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/// Default ctor.
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///
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/// @note This has to exist, because this is a pass, but it should never be
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/// used.
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TargetData() : ImmutablePass((intptr_t)&ID) {
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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 specification string. See init().
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TargetData(const std::string &TargetDescription)
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: ImmutablePass((intptr_t)&ID) {
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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((intptr_t)&ID),
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LittleEndian(TD.isLittleEndian()),
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PointerMemSize(TD.PointerMemSize),
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PointerABIAlign(TD.PointerABIAlign),
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PointerPrefAlign(TD.PointerPrefAlign),
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Alignments(TD.Alignments)
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{ }
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~TargetData(); // Not virtual, do not subclass this class
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//! Parse a target data layout string and initialize TargetData alignments.
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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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/// 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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/// Target pointer alignment
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unsigned char getPointerABIAlignment() const { return PointerABIAlign; }
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/// Return target's alignment for stack-based pointers
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unsigned char getPointerPrefAlignment() const { return PointerPrefAlign; }
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/// Target pointer size
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unsigned char getPointerSize() const { return PointerMemSize; }
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/// Target pointer size, in bits
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unsigned char getPointerSizeInBits() const { return 8*PointerMemSize; }
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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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/// getTypeSizeInBits - Return the number of bits necessary to hold the
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/// specified type.
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uint64_t getTypeSizeInBits(const Type* Ty) const;
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/// getABITypeAlignment - Return the minimum ABI-required alignment for the
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/// specified type.
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unsigned char getABITypeAlignment(const Type *Ty) const;
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/// getPrefTypeAlignment - Return the preferred stack/global alignment for
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/// the specified type.
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unsigned char getPrefTypeAlignment(const Type *Ty) const;
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/// getPreferredTypeAlignmentShift - Return the preferred 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 getPreferredTypeAlignmentShift(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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/// getIndexedOffset - 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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Value* const* Indices, unsigned NumIndices) 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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static char ID; // Pass identification, replacement for typeid
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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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uint64_t StructSize;
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unsigned StructAlignment;
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unsigned NumElements;
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uint64_t MemberOffsets[1]; // variable sized array!
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public:
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uint64_t getSizeInBytes() const {
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return StructSize;
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}
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unsigned getAlignment() const {
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return StructAlignment;
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}
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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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uint64_t getElementOffset(unsigned Idx) const {
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assert(Idx < NumElements && "Invalid element idx!");
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return MemberOffsets[Idx];
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}
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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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