<commit_before>//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines target properties related to datatype size/offset/alignment
// information.  It uses lazy annotations to cache information about how
// structure types are laid out and used.
//
// This structure should be created once, filled in if the defaults are not
// correct and then passed around by const&.  None of the members functions
// require modification to the object.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TARGET_TARGETDATA_H
#define LLVM_TARGET_TARGETDATA_H

#include "llvm/Pass.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/DataTypes.h"

namespace llvm {

class Value;
class Type;
class IntegerType;
class StructType;
class StructLayout;
class GlobalVariable;
class LLVMContext;

/// Enum used to categorize the alignment types stored by TargetAlignElem
enum AlignTypeEnum {
  INTEGER_ALIGN = 'i',               ///< Integer type alignment
  VECTOR_ALIGN = 'v',                ///< Vector type alignment
  FLOAT_ALIGN = 'f',                 ///< Floating point type alignment
  AGGREGATE_ALIGN = 'a',             ///< Aggregate alignment
  STACK_ALIGN = 's'                  ///< Stack objects alignment
};
/// Target alignment element.
///
/// Stores the alignment data associated with a given alignment type (pointer,
/// integer, vector, float) and type bit width.
///
/// @note The unusual order of elements in the structure attempts to reduce
/// padding and make the structure slightly more cache friendly.
struct TargetAlignElem {
  AlignTypeEnum       AlignType : 8;  //< Alignment type (AlignTypeEnum)
  unsigned            ABIAlign;       //< ABI alignment for this type/bitw
  unsigned            PrefAlign;      //< Pref. alignment for this type/bitw
  uint32_t            TypeBitWidth;   //< Type bit width

  /// Initializer
  static TargetAlignElem get(AlignTypeEnum align_type, unsigned abi_align,
                             unsigned pref_align, uint32_t bit_width);
  /// Equality predicate
  bool operator==(const TargetAlignElem &rhs) const;
};

class TargetData : public ImmutablePass {
private:
  bool          LittleEndian;          ///< Defaults to false
  unsigned      PointerMemSize;        ///< Pointer size in bytes
  unsigned      PointerABIAlign;       ///< Pointer ABI alignment
  unsigned      PointerPrefAlign;      ///< Pointer preferred alignment

  SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
  
  /// Alignments- Where the primitive type alignment data is stored.
  ///
  /// @sa init().
  /// @note Could support multiple size pointer alignments, e.g., 32-bit
  /// pointers vs. 64-bit pointers by extending TargetAlignment, but for now,
  /// we don't.
  SmallVector<TargetAlignElem, 16> Alignments;
  
  /// InvalidAlignmentElem - This member is a signal that a requested alignment
  /// type and bit width were not found in the SmallVector.
  static const TargetAlignElem InvalidAlignmentElem;

  // The StructType -> StructLayout map.
  mutable void *LayoutMap;

  //! Set/initialize target alignments
  void setAlignment(AlignTypeEnum align_type, unsigned abi_align,
                    unsigned pref_align, uint32_t bit_width);
  unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
                            bool ABIAlign, const Type *Ty) const;
  //! Internal helper method that returns requested alignment for type.
  unsigned getAlignment(const Type *Ty, bool abi_or_pref) const;

  /// Valid alignment predicate.
  ///
  /// Predicate that tests a TargetAlignElem reference returned by get() against
  /// InvalidAlignmentElem.
  bool validAlignment(const TargetAlignElem &align) const {
    return &align != &InvalidAlignmentElem;
  }

public:
  /// Default ctor.
  ///
  /// @note This has to exist, because this is a pass, but it should never be
  /// used.
  TargetData();
  
  /// Constructs a TargetData from a specification string. See init().
  explicit TargetData(StringRef TargetDescription)
    : ImmutablePass(ID) {
    init(TargetDescription);
  }

  /// Initialize target data from properties stored in the module.
  explicit TargetData(const Module *M);

  TargetData(const TargetData &TD) :
    ImmutablePass(ID),
    LittleEndian(TD.isLittleEndian()),
    PointerMemSize(TD.PointerMemSize),
    PointerABIAlign(TD.PointerABIAlign),
    PointerPrefAlign(TD.PointerPrefAlign),
    LegalIntWidths(TD.LegalIntWidths),
    Alignments(TD.Alignments),
    LayoutMap(0)
  { }

  ~TargetData();  // Not virtual, do not subclass this class

  //! Parse a target data layout string and initialize TargetData alignments.
  void init(StringRef TargetDescription);

  /// Target endianness...
  bool isLittleEndian() const { return LittleEndian; }
  bool isBigEndian() const { return !LittleEndian; }

  /// getStringRepresentation - Return the string representation of the
  /// TargetData.  This representation is in the same format accepted by the
  /// string constructor above.
  std::string getStringRepresentation() const;
  
  /// isLegalInteger - This function returns true if the specified type is
  /// known to be a native integer type supported by the CPU.  For example,
  /// i64 is not native on most 32-bit CPUs and i37 is not native on any known
  /// one.  This returns false if the integer width is not legal.
  ///
  /// The width is specified in bits.
  ///
  bool isLegalInteger(unsigned Width) const {
    for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
      if (LegalIntWidths[i] == Width)
        return true;
    return false;
  }
  
  bool isIllegalInteger(unsigned Width) const {
    return !isLegalInteger(Width);
  }
  <commit_msg>Add TargetData::fitsInLegalInteger().<commit_after>//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines target properties related to datatype size/offset/alignment
// information.  It uses lazy annotations to cache information about how
// structure types are laid out and used.
//
// This structure should be created once, filled in if the defaults are not
// correct and then passed around by const&.  None of the members functions
// require modification to the object.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TARGET_TARGETDATA_H
#define LLVM_TARGET_TARGETDATA_H

#include "llvm/Pass.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/DataTypes.h"

namespace llvm {

class Value;
class Type;
class IntegerType;
class StructType;
class StructLayout;
class GlobalVariable;
class LLVMContext;

/// Enum used to categorize the alignment types stored by TargetAlignElem
enum AlignTypeEnum {
  INTEGER_ALIGN = 'i',               ///< Integer type alignment
  VECTOR_ALIGN = 'v',                ///< Vector type alignment
  FLOAT_ALIGN = 'f',                 ///< Floating point type alignment
  AGGREGATE_ALIGN = 'a',             ///< Aggregate alignment
  STACK_ALIGN = 's'                  ///< Stack objects alignment
};
/// Target alignment element.
///
/// Stores the alignment data associated with a given alignment type (pointer,
/// integer, vector, float) and type bit width.
///
/// @note The unusual order of elements in the structure attempts to reduce
/// padding and make the structure slightly more cache friendly.
struct TargetAlignElem {
  AlignTypeEnum       AlignType : 8;  //< Alignment type (AlignTypeEnum)
  unsigned            ABIAlign;       //< ABI alignment for this type/bitw
  unsigned            PrefAlign;      //< Pref. alignment for this type/bitw
  uint32_t            TypeBitWidth;   //< Type bit width

  /// Initializer
  static TargetAlignElem get(AlignTypeEnum align_type, unsigned abi_align,
                             unsigned pref_align, uint32_t bit_width);
  /// Equality predicate
  bool operator==(const TargetAlignElem &rhs) const;
};

class TargetData : public ImmutablePass {
private:
  bool          LittleEndian;          ///< Defaults to false
  unsigned      PointerMemSize;        ///< Pointer size in bytes
  unsigned      PointerABIAlign;       ///< Pointer ABI alignment
  unsigned      PointerPrefAlign;      ///< Pointer preferred alignment

  SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
  
  /// Alignments- Where the primitive type alignment data is stored.
  ///
  /// @sa init().
  /// @note Could support multiple size pointer alignments, e.g., 32-bit
  /// pointers vs. 64-bit pointers by extending TargetAlignment, but for now,
  /// we don't.
  SmallVector<TargetAlignElem, 16> Alignments;
  
  /// InvalidAlignmentElem - This member is a signal that a requested alignment
  /// type and bit width were not found in the SmallVector.
  static const TargetAlignElem InvalidAlignmentElem;

  // The StructType -> StructLayout map.
  mutable void *LayoutMap;

  //! Set/initialize target alignments
  void setAlignment(AlignTypeEnum align_type, unsigned abi_align,
                    unsigned pref_align, uint32_t bit_width);
  unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
                            bool ABIAlign, const Type *Ty) const;
  //! Internal helper method that returns requested alignment for type.
  unsigned getAlignment(const Type *Ty, bool abi_or_pref) const;

  /// Valid alignment predicate.
  ///
  /// Predicate that tests a TargetAlignElem reference returned by get() against
  /// InvalidAlignmentElem.
  bool validAlignment(const TargetAlignElem &align) const {
    return &align != &InvalidAlignmentElem;
  }

public:
  /// Default ctor.
  ///
  /// @note This has to exist, because this is a pass, but it should never be
  /// used.
  TargetData();
  
  /// Constructs a TargetData from a specification string. See init().
  explicit TargetData(StringRef TargetDescription)
    : ImmutablePass(ID) {
    init(TargetDescription);
  }

  /// Initialize target data from properties stored in the module.
  explicit TargetData(const Module *M);

  TargetData(const TargetData &TD) :
    ImmutablePass(ID),
    LittleEndian(TD.isLittleEndian()),
    PointerMemSize(TD.PointerMemSize),
    PointerABIAlign(TD.PointerABIAlign),
    PointerPrefAlign(TD.PointerPrefAlign),
    LegalIntWidths(TD.LegalIntWidths),
    Alignments(TD.Alignments),
    LayoutMap(0)
  { }

  ~TargetData();  // Not virtual, do not subclass this class

  //! Parse a target data layout string and initialize TargetData alignments.
  void init(StringRef TargetDescription);

  /// Target endianness...
  bool isLittleEndian() const { return LittleEndian; }
  bool isBigEndian() const { return !LittleEndian; }

  /// getStringRepresentation - Return the string representation of the
  /// TargetData.  This representation is in the same format accepted by the
  /// string constructor above.
  std::string getStringRepresentation() const;
  
  /// isLegalInteger - This function returns true if the specified type is
  /// known to be a native integer type supported by the CPU.  For example,
  /// i64 is not native on most 32-bit CPUs and i37 is not native on any known
  /// one.  This returns false if the integer width is not legal.
  ///
  /// The width is specified in bits.
  ///
  bool isLegalInteger(unsigned Width) const {
    for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
      if (LegalIntWidths[i] == Width)
        return true;
    return false;
  }
  
  bool isIllegalInteger(unsigned Width) const {
    return !isLegalInteger(Width);
  }

  /// fitsInLegalInteger - This function returns true if the specified type fits
  /// in a native integer type supported by the CPU.  For example, if the CPU
  /// only supports i32 as a native integer type, then i27 fits in a legal
  // integer type but i45 does not.
  bool fitsInLegalInteger(unsigned Width) const {
    for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
      if (Width <= LegalIntWidths[i])
        return true;
    return false;
  }

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