Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef SHARE_VM_OPTO_TYPE_HPP

 #define SHARE_VM_OPTO_TYPE_HPP

 #include "libadt/port.hpp"

 #include "opto/adlcVMDeps.hpp"

 #include "runtime/handles.hpp"

 // Portions of code courtesy of Clifford Click

 // Optimization - Graph Style

 // This class defines a Type lattice.  The lattice is used in the constant

 // propagation algorithms, and for some type-checking of the iloc code.

 // Basic types include RSD's (lower bound, upper bound, stride for integers),

 // float & double precision constants, sets of data-labels and code-labels.

 // The complete lattice is described below.  Subtypes have no relationship to

 // up or down in the lattice; that is entirely determined by the behavior of

 // the MEET/JOIN functions.

 class Dict;

 class Type;

 class   TypeD;

 class   TypeF;

 class   TypeInt;

 class   TypeLong;

 class   TypeNarrowPtr;

 class     TypeNarrowOop;

 class     TypeNarrowKlass;

 class   TypeAry;

 class   TypeTuple;

 class   TypeVect;

 class     TypeVectS;

 class     TypeVectD;

 class     TypeVectX;

 class     TypeVectY;

 class   TypePtr;

 class     TypeRawPtr;

 class     TypeOopPtr;

 class       TypeInstPtr;

 class       TypeAryPtr;

 class     TypeKlassPtr;

 class     TypeMetadataPtr;

 //------------------------------Type-------------------------------------------

 // Basic Type object, represents a set of primitive Values.

 // Types are hash-cons'd into a private class dictionary, so only one of each

 // different kind of Type exists.  Types are never modified after creation, so

 // all their interesting fields are constant.

 class Type {

   friend class VMStructs;

 public:

   enum TYPES {

     Bad=0,                      // Type check

     Control,                    // Control of code (not in lattice)

     Top,                        // Top of the lattice

     Int,                        // Integer range (lo-hi)

     Long,                       // Long integer range (lo-hi)

     Half,                       // Placeholder half of doubleword

     NarrowOop,                  // Compressed oop pointer

     NarrowKlass,                // Compressed klass pointer

     Tuple,                      // Method signature or object layout

     Array,                      // Array types

     VectorS,                    //  32bit Vector types

     VectorD,                    //  64bit Vector types

     VectorX,                    // 128bit Vector types

     VectorY,                    // 256bit Vector types

     AnyPtr,                     // Any old raw, klass, inst, or array pointer

     RawPtr,                     // Raw (non-oop) pointers

     OopPtr,                     // Any and all Java heap entities

     InstPtr,                    // Instance pointers (non-array objects)

     AryPtr,                     // Array pointers

     // (Ptr order matters:  See is_ptr, isa_ptr, is_oopptr, isa_oopptr.)

     MetadataPtr,                // Generic metadata

     KlassPtr,                   // Klass pointers

     Function,                   // Function signature

     Abio,                       // Abstract I/O

     Return_Address,             // Subroutine return address

     Memory,                     // Abstract store

     FloatTop,                   // No float value

     FloatCon,                   // Floating point constant

     FloatBot,                   // Any float value

     DoubleTop,                  // No double value

     DoubleCon,                  // Double precision constant

     DoubleBot,                  // Any double value

     Bottom,                     // Bottom of lattice

     lastype                     // Bogus ending type (not in lattice)

   };

   // Signal values for offsets from a base pointer

   enum OFFSET_SIGNALS {

     OffsetTop = -2000000000,    // undefined offset

     OffsetBot = -2000000001     // any possible offset

   };

   // Min and max WIDEN values.

   enum WIDEN {

     WidenMin = 0,

     WidenMax = 3

   };

 private:

   typedef struct {

     const TYPES                dual_type;

     const BasicType            basic_type;

     const char*                msg;

     const bool                 isa_oop;

     const int                  ideal_reg;

     const relocInfo::relocType reloc;

   } TypeInfo;

   // Dictionary of types shared among compilations.

   static Dict* _shared_type_dict;

   static TypeInfo _type_info[];

   static int uhash( const Type *const t );

   // Structural equality check.  Assumes that cmp() has already compared

   // the _base types and thus knows it can cast 't' appropriately.

   virtual bool eq( const Type *t ) const;

   // Top-level hash-table of types

   static Dict *type_dict() {

     return Compile::current()->type_dict();

   }

   // DUAL operation: reflect around lattice centerline.  Used instead of

   // join to ensure my lattice is symmetric up and down.  Dual is computed

   // lazily, on demand, and cached in _dual.

   const Type *_dual;            // Cached dual value

   // Table for efficient dualing of base types

   static const TYPES dual_type[lastype];

 #ifdef ASSERT

   // One type is interface, the other is oop

   virtual bool interface_vs_oop_helper(const Type *t) const;

 #endif

   const Type *meet_helper(const Type *t, bool include_speculative) const;

 protected:

   // Each class of type is also identified by its base.

   const TYPES _base;            // Enum of Types type

   Type( TYPES t ) : _dual(NULL),  _base(t) {} // Simple types

   // ~Type();                   // Use fast deallocation

   const Type *hashcons();       // Hash-cons the type

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

   const Type *join_helper(const Type *t, bool include_speculative) const {

     return dual()->meet_helper(t->dual(), include_speculative)->dual();

   }

 public:

   inline void* operator new( size_t x ) throw() {

     Compile* compile = Compile::current();

     compile->set_type_last_size(x);

     void *temp = compile->type_arena()->Amalloc_D(x);

     compile->set_type_hwm(temp);

     return temp;

   }

   inline void operator delete( void* ptr ) {

     Compile* compile = Compile::current();

     compile->type_arena()->Afree(ptr,compile->type_last_size());

   }

   // Initialize the type system for a particular compilation.

   static void Initialize(Compile* compile);

   // Initialize the types shared by all compilations.

   static void Initialize_shared(Compile* compile);

   TYPES base() const {

     assert(_base > Bad && _base < lastype, "sanity");

     return _base;

   }

   // Create a new hash-consd type

   static const Type *make(enum TYPES);

   // Test for equivalence of types

   static int cmp( const Type *const t1, const Type *const t2 );

   // Test for higher or equal in lattice

   // Variant that drops the speculative part of the types

   int higher_equal(const Type *t) const {

     return !cmp(meet(t),t->remove_speculative());

   }

   // Variant that keeps the speculative part of the types

   int higher_equal_speculative(const Type *t) const {

     return !cmp(meet_speculative(t),t);

   }

   // MEET operation; lower in lattice.

   // Variant that drops the speculative part of the types

   const Type *meet(const Type *t) const {

     return meet_helper(t, false);

   }

   // Variant that keeps the speculative part of the types

   const Type *meet_speculative(const Type *t) const {

     return meet_helper(t, true);

   }

   // WIDEN: 'widens' for Ints and other range types

   virtual const Type *widen( const Type *old, const Type* limit ) const { return this; }

   // NARROW: complement for widen, used by pessimistic phases

   virtual const Type *narrow( const Type *old ) const { return this; }

   // DUAL operation: reflect around lattice centerline.  Used instead of

   // join to ensure my lattice is symmetric up and down.

   const Type *dual() const { return _dual; }

   // Compute meet dependent on base type

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // JOIN operation; higher in lattice.  Done by finding the dual of the

   // meet of the dual of the 2 inputs.

   // Variant that drops the speculative part of the types

   const Type *join(const Type *t) const {

     return join_helper(t, false);

   }

   // Variant that keeps the speculative part of the types

   const Type *join_speculative(const Type *t) const {

     return join_helper(t, true);

   }

   // Modified version of JOIN adapted to the needs Node::Value.

   // Normalizes all empty values to TOP.  Does not kill _widen bits.

   // Currently, it also works around limitations involving interface types.

   // Variant that drops the speculative part of the types

   const Type *filter(const Type *kills) const {

     return filter_helper(kills, false);

   }

   // Variant that keeps the speculative part of the types

   const Type *filter_speculative(const Type *kills) const {

     return filter_helper(kills, true);

   }

 #ifdef ASSERT

   // One type is interface, the other is oop

   virtual bool interface_vs_oop(const Type *t) const;

 #endif

   // Returns true if this pointer points at memory which contains a

   // compressed oop references.

   bool is_ptr_to_narrowoop() const;

   bool is_ptr_to_narrowklass() const;

   bool is_ptr_to_boxing_obj() const;

   // Convenience access

   float getf() const;

   double getd() const;

   const TypeInt    *is_int() const;

   const TypeInt    *isa_int() const;             // Returns NULL if not an Int

   const TypeLong   *is_long() const;

   const TypeLong   *isa_long() const;            // Returns NULL if not a Long

   const TypeD      *isa_double() const;          // Returns NULL if not a Double{Top,Con,Bot}

   const TypeD      *is_double_constant() const;  // Asserts it is a DoubleCon

   const TypeD      *isa_double_constant() const; // Returns NULL if not a DoubleCon

   const TypeF      *isa_float() const;           // Returns NULL if not a Float{Top,Con,Bot}

   const TypeF      *is_float_constant() const;   // Asserts it is a FloatCon

   const TypeF      *isa_float_constant() const;  // Returns NULL if not a FloatCon

   const TypeTuple  *is_tuple() const;            // Collection of fields, NOT a pointer

   const TypeAry    *is_ary() const;              // Array, NOT array pointer

   const TypeVect   *is_vect() const;             // Vector

   const TypeVect   *isa_vect() const;            // Returns NULL if not a Vector

   const TypePtr    *is_ptr() const;              // Asserts it is a ptr type

   const TypePtr    *isa_ptr() const;             // Returns NULL if not ptr type

   const TypeRawPtr *isa_rawptr() const;          // NOT Java oop

   const TypeRawPtr *is_rawptr() const;           // Asserts is rawptr

   const TypeNarrowOop  *is_narrowoop() const;    // Java-style GC'd pointer

   const TypeNarrowOop  *isa_narrowoop() const;   // Returns NULL if not oop ptr type

   const TypeNarrowKlass *is_narrowklass() const; // compressed klass pointer

   const TypeNarrowKlass *isa_narrowklass() const;// Returns NULL if not oop ptr type

   const TypeOopPtr   *isa_oopptr() const;        // Returns NULL if not oop ptr type

   const TypeOopPtr   *is_oopptr() const;         // Java-style GC'd pointer

   const TypeInstPtr  *isa_instptr() const;       // Returns NULL if not InstPtr

   const TypeInstPtr  *is_instptr() const;        // Instance

   const TypeAryPtr   *isa_aryptr() const;        // Returns NULL if not AryPtr

   const TypeAryPtr   *is_aryptr() const;         // Array oop

   const TypeMetadataPtr   *isa_metadataptr() const;   // Returns NULL if not oop ptr type

   const TypeMetadataPtr   *is_metadataptr() const;    // Java-style GC'd pointer

   const TypeKlassPtr      *isa_klassptr() const;      // Returns NULL if not KlassPtr

   const TypeKlassPtr      *is_klassptr() const;       // assert if not KlassPtr

   virtual bool      is_finite() const;           // Has a finite value

   virtual bool      is_nan()    const;           // Is not a number (NaN)

   // Returns this ptr type or the equivalent ptr type for this compressed pointer.

   const TypePtr* make_ptr() const;

   // Returns this oopptr type or the equivalent oopptr type for this compressed pointer.

   // Asserts if the underlying type is not an oopptr or narrowoop.

   const TypeOopPtr* make_oopptr() const;

   // Returns this compressed pointer or the equivalent compressed version

   // of this pointer type.

   const TypeNarrowOop* make_narrowoop() const;

   // Returns this compressed klass pointer or the equivalent

   // compressed version of this pointer type.

   const TypeNarrowKlass* make_narrowklass() const;

   // Special test for register pressure heuristic

   bool is_floatingpoint() const;        // True if Float or Double base type

   // Do you have memory, directly or through a tuple?

   bool has_memory( ) const;

   // TRUE if type is a singleton

   virtual bool singleton(void) const;

   // TRUE if type is above the lattice centerline, and is therefore vacuous

   virtual bool empty(void) const;

   // Return a hash for this type.  The hash function is public so ConNode

   // (constants) can hash on their constant, which is represented by a Type.

   virtual int hash() const;

   // Map ideal registers (machine types) to ideal types

   static const Type *mreg2type[];

   // Printing, statistics

 #ifndef PRODUCT

   void         dump_on(outputStream *st) const;

   void         dump() const {

     dump_on(tty);

   }

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

   static  void dump_stats();

 #endif

   void typerr(const Type *t) const; // Mixing types error

   // Create basic type

   static const Type* get_const_basic_type(BasicType type) {

     assert((uint)type <= T_CONFLICT && _const_basic_type[type] != NULL, "bad type");

     return _const_basic_type[type];

   }

   // Mapping to the array element's basic type.

   BasicType array_element_basic_type() const;

   // Create standard type for a ciType:

   static const Type* get_const_type(ciType* type);

   // Create standard zero value:

   static const Type* get_zero_type(BasicType type) {

     assert((uint)type <= T_CONFLICT && _zero_type[type] != NULL, "bad type");

     return _zero_type[type];

   }

   // Report if this is a zero value (not top).

   bool is_zero_type() const {

     BasicType type = basic_type();

     if (type == T_VOID || type >= T_CONFLICT)

       return false;

     else

       return (this == _zero_type[type]);

   }

   // Convenience common pre-built types.

   static const Type *ABIO;

   static const Type *BOTTOM;

   static const Type *CONTROL;

   static const Type *DOUBLE;

   static const Type *FLOAT;

   static const Type *HALF;

   static const Type *MEMORY;

   static const Type *MULTI;

   static const Type *RETURN_ADDRESS;

   static const Type *TOP;

   // Mapping from compiler type to VM BasicType

   BasicType basic_type() const       { return _type_info[_base].basic_type; }

   int ideal_reg() const              { return _type_info[_base].ideal_reg; }

   const char* msg() const            { return _type_info[_base].msg; }

   bool isa_oop_ptr() const           { return _type_info[_base].isa_oop; }

   relocInfo::relocType reloc() const { return _type_info[_base].reloc; }

   // Mapping from CI type system to compiler type:

   static const Type* get_typeflow_type(ciType* type);

   static const Type* make_from_constant(ciConstant constant,

                                         bool require_constant = false,

                                         bool is_autobox_cache = false);

   // Speculative type. See TypeInstPtr

   virtual ciKlass* speculative_type() const { return NULL; }

   const Type* maybe_remove_speculative(bool include_speculative) const;

   virtual const Type* remove_speculative() const { return this; }

 private:

   // support arrays

   static const BasicType _basic_type[];

   static const Type*        _zero_type[T_CONFLICT+1];

   static const Type* _const_basic_type[T_CONFLICT+1];

 };

 //------------------------------TypeF------------------------------------------

 // Class of Float-Constant Types.

 class TypeF : public Type {

   TypeF( float f ) : Type(FloatCon), _f(f) {};

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 public:

   const float _f;               // Float constant

   static const TypeF *make(float f);

   virtual bool        is_finite() const;  // Has a finite value

   virtual bool        is_nan()    const;  // Is not a number (NaN)

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // Convenience common pre-built types.

   static const TypeF *ZERO; // positive zero only

   static const TypeF *ONE;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeD------------------------------------------

 // Class of Double-Constant Types.

 class TypeD : public Type {

   TypeD( double d ) : Type(DoubleCon), _d(d) {};

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 public:

   const double _d;              // Double constant

   static const TypeD *make(double d);

   virtual bool        is_finite() const;  // Has a finite value

   virtual bool        is_nan()    const;  // Is not a number (NaN)

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // Convenience common pre-built types.

   static const TypeD *ZERO; // positive zero only

   static const TypeD *ONE;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeInt----------------------------------------

 // Class of integer ranges, the set of integers between a lower bound and an

 // upper bound, inclusive.

 class TypeInt : public Type {

   TypeInt( jint lo, jint hi, int w );

 protected:

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

 public:

   typedef jint NativeType;

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

   const jint _lo, _hi;          // Lower bound, upper bound

   const short _widen;           // Limit on times we widen this sucker

   static const TypeInt *make(jint lo);

   // must always specify w

   static const TypeInt *make(jint lo, jint hi, int w);

   // Check for single integer

   int is_con() const { return _lo==_hi; }

   bool is_con(int i) const { return is_con() && _lo == i; }

   jint get_con() const { assert( is_con(), "" );  return _lo; }

   virtual bool        is_finite() const;  // Has a finite value

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   virtual const Type *widen( const Type *t, const Type* limit_type ) const;

   virtual const Type *narrow( const Type *t ) const;

   // Do not kill _widen bits.

   // Convenience common pre-built types.

   static const TypeInt *MINUS_1;

   static const TypeInt *ZERO;

   static const TypeInt *ONE;

   static const TypeInt *BOOL;

   static const TypeInt *CC;

   static const TypeInt *CC_LT;  // [-1]  == MINUS_1

   static const TypeInt *CC_GT;  // [1]   == ONE

   static const TypeInt *CC_EQ;  // [0]   == ZERO

   static const TypeInt *CC_LE;  // [-1,0]

   static const TypeInt *CC_GE;  // [0,1] == BOOL (!)

   static const TypeInt *BYTE;

   static const TypeInt *UBYTE;

   static const TypeInt *CHAR;

   static const TypeInt *SHORT;

   static const TypeInt *POS;

   static const TypeInt *POS1;

   static const TypeInt *INT;

   static const TypeInt *SYMINT; // symmetric range [-max_jint..max_jint]

   static const TypeInt *TYPE_DOMAIN; // alias for TypeInt::INT

   static const TypeInt *as_self(const Type *t) { return t->is_int(); }

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeLong---------------------------------------

 // Class of long integer ranges, the set of integers between a lower bound and

 // an upper bound, inclusive.

 class TypeLong : public Type {

   TypeLong( jlong lo, jlong hi, int w );

 protected:

   // Do not kill _widen bits.

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

 public:

   typedef jlong NativeType;

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 public:

   const jlong _lo, _hi;         // Lower bound, upper bound

   const short _widen;           // Limit on times we widen this sucker

   static const TypeLong *make(jlong lo);

   // must always specify w

   static const TypeLong *make(jlong lo, jlong hi, int w);

   // Check for single integer

   int is_con() const { return _lo==_hi; }

   bool is_con(int i) const { return is_con() && _lo == i; }

   jlong get_con() const { assert( is_con(), "" ); return _lo; }

   virtual bool        is_finite() const;  // Has a finite value

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   virtual const Type *widen( const Type *t, const Type* limit_type ) const;

   virtual const Type *narrow( const Type *t ) const;

   // Convenience common pre-built types.

   static const TypeLong *MINUS_1;

   static const TypeLong *ZERO;

   static const TypeLong *ONE;

   static const TypeLong *POS;

   static const TypeLong *LONG;

   static const TypeLong *INT;    // 32-bit subrange [min_jint..max_jint]

   static const TypeLong *UINT;   // 32-bit unsigned [0..max_juint]

   static const TypeLong *TYPE_DOMAIN; // alias for TypeLong::LONG

   // static convenience methods.

   static const TypeLong *as_self(const Type *t) { return t->is_long(); }

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint, outputStream *st  ) const;// Specialized per-Type dumping

 #endif

 };

 //------------------------------TypeTuple--------------------------------------

 // Class of Tuple Types, essentially type collections for function signatures

 // and class layouts.  It happens to also be a fast cache for the HotSpot

 // signature types.

 class TypeTuple : public Type {

   TypeTuple( uint cnt, const Type **fields ) : Type(Tuple), _cnt(cnt), _fields(fields) { }

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 public:

   const uint          _cnt;              // Count of fields

   const Type ** const _fields;           // Array of field types

   // Accessors:

   uint cnt() const { return _cnt; }

   const Type* field_at(uint i) const {

     assert(i < _cnt, "oob");

     return _fields[i];

   }

   void set_field_at(uint i, const Type* t) {

     assert(i < _cnt, "oob");

     _fields[i] = t;

   }

   static const TypeTuple *make( uint cnt, const Type **fields );

   static const TypeTuple *make_range(ciSignature *sig);

   static const TypeTuple *make_domain(ciInstanceKlass* recv, ciSignature *sig);

   // Subroutine call type with space allocated for argument types

   static const Type **fields( uint arg_cnt );

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // Convenience common pre-built types.

   static const TypeTuple *IFBOTH;

   static const TypeTuple *IFFALSE;

   static const TypeTuple *IFTRUE;

   static const TypeTuple *IFNEITHER;

   static const TypeTuple *LOOPBODY;

   static const TypeTuple *MEMBAR;

   static const TypeTuple *STORECONDITIONAL;

   static const TypeTuple *START_I2C;

   static const TypeTuple *INT_PAIR;

   static const TypeTuple *LONG_PAIR;

   static const TypeTuple *INT_CC_PAIR;

   static const TypeTuple *LONG_CC_PAIR;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint, outputStream *st  ) const; // Specialized per-Type dumping

 #endif

 };

 //------------------------------TypeAry----------------------------------------

 // Class of Array Types

 class TypeAry : public Type {

   TypeAry(const Type* elem, const TypeInt* size, bool stable) : Type(Array),

       _elem(elem), _size(size), _stable(stable) {}

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 private:

   const Type *_elem;            // Element type of array

   const TypeInt *_size;         // Elements in array

   const bool _stable;           // Are elements @Stable?

   friend class TypeAryPtr;

 public:

   static const TypeAry* make(const Type* elem, const TypeInt* size, bool stable = false);

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   bool ary_must_be_exact() const;  // true if arrays of such are never generic

   virtual const Type* remove_speculative() const;

 #ifdef ASSERT

   // One type is interface, the other is oop

   virtual bool interface_vs_oop(const Type *t) const;

 #endif

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint, outputStream *st  ) const; // Specialized per-Type dumping

 #endif

 };

 //------------------------------TypeVect---------------------------------------

 // Class of Vector Types

 class TypeVect : public Type {

   const Type*   _elem;  // Vector's element type

   const uint  _length;  // Elements in vector (power of 2)

 protected:

   TypeVect(TYPES t, const Type* elem, uint length) : Type(t),

     _elem(elem), _length(length) {}

 public:

   const Type* element_type() const { return _elem; }

   BasicType element_basic_type() const { return _elem->array_element_basic_type(); }

   uint length() const { return _length; }

   uint length_in_bytes() const {

    return _length * type2aelembytes(element_basic_type());

   }

   virtual bool eq(const Type *t) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

   static const TypeVect *make(const BasicType elem_bt, uint length) {

     // Use bottom primitive type.

     return make(get_const_basic_type(elem_bt), length);

   }

   // Used directly by Replicate nodes to construct singleton vector.

   static const TypeVect *make(const Type* elem, uint length);

   virtual const Type *xmeet( const Type *t) const;

   virtual const Type *xdual() const;     // Compute dual right now.

   static const TypeVect *VECTS;

   static const TypeVect *VECTD;

   static const TypeVect *VECTX;

   static const TypeVect *VECTY;

 #ifndef PRODUCT

   virtual void dump2(Dict &d, uint, outputStream *st) const; // Specialized per-Type dumping

 #endif

 };

 class TypeVectS : public TypeVect {

   friend class TypeVect;

   TypeVectS(const Type* elem, uint length) : TypeVect(VectorS, elem, length) {}

 };

 class TypeVectD : public TypeVect {

   friend class TypeVect;

   TypeVectD(const Type* elem, uint length) : TypeVect(VectorD, elem, length) {}

 };

 class TypeVectX : public TypeVect {

   friend class TypeVect;

   TypeVectX(const Type* elem, uint length) : TypeVect(VectorX, elem, length) {}

 };

 class TypeVectY : public TypeVect {

   friend class TypeVect;

   TypeVectY(const Type* elem, uint length) : TypeVect(VectorY, elem, length) {}

 };

 //------------------------------TypePtr----------------------------------------

 // Class of machine Pointer Types: raw data, instances or arrays.

 // If the _base enum is AnyPtr, then this refers to all of the above.

 // Otherwise the _base will indicate which subset of pointers is affected,

 // and the class will be inherited from.

 class TypePtr : public Type {

   friend class TypeNarrowPtr;

 public:

   enum PTR { TopPTR, AnyNull, Constant, Null, NotNull, BotPTR, lastPTR };

 protected:

   TypePtr( TYPES t, PTR ptr, int offset ) : Type(t), _ptr(ptr), _offset(offset) {}

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   static const PTR ptr_meet[lastPTR][lastPTR];

   static const PTR ptr_dual[lastPTR];

   static const char * const ptr_msg[lastPTR];

 public:

   const int _offset;            // Offset into oop, with TOP & BOT

   const PTR _ptr;               // Pointer equivalence class

   const int offset() const { return _offset; }

   const PTR ptr()    const { return _ptr; }

   static const TypePtr *make( TYPES t, PTR ptr, int offset );

   // Return a 'ptr' version of this type

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual intptr_t get_con() const;

   int xadd_offset( intptr_t offset ) const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

   virtual const Type *xmeet( const Type *t ) const;

   int meet_offset( int offset ) const;

   int dual_offset( ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // meet, dual and join over pointer equivalence sets

   PTR meet_ptr( const PTR in_ptr ) const { return ptr_meet[in_ptr][ptr()]; }

   PTR dual_ptr()                   const { return ptr_dual[ptr()];      }

   // This is textually confusing unless one recalls that

   // join(t) == dual()->meet(t->dual())->dual().

   PTR join_ptr( const PTR in_ptr ) const {

     return ptr_dual[ ptr_meet[ ptr_dual[in_ptr] ] [ dual_ptr() ] ];

   }

   // Tests for relation to centerline of type lattice:

   static bool above_centerline(PTR ptr) { return (ptr <= AnyNull); }

   static bool below_centerline(PTR ptr) { return (ptr >= NotNull); }

   // Convenience common pre-built types.

   static const TypePtr *NULL_PTR;

   static const TypePtr *NOTNULL;

   static const TypePtr *BOTTOM;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st  ) const;

 #endif

 };

 //------------------------------TypeRawPtr-------------------------------------

 // Class of raw pointers, pointers to things other than Oops.  Examples

 // include the stack pointer, top of heap, card-marking area, handles, etc.

 class TypeRawPtr : public TypePtr {

 protected:

   TypeRawPtr( PTR ptr, address bits ) : TypePtr(RawPtr,ptr,0), _bits(bits){}

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;     // Type specific hashing

   const address _bits;          // Constant value, if applicable

   static const TypeRawPtr *make( PTR ptr );

   static const TypeRawPtr *make( address bits );

   // Return a 'ptr' version of this type

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual intptr_t get_con() const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // Convenience common pre-built types.

   static const TypeRawPtr *BOTTOM;

   static const TypeRawPtr *NOTNULL;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st  ) const;

 #endif

 };

 //------------------------------TypeOopPtr-------------------------------------

 // Some kind of oop (Java pointer), either klass or instance or array.

 class TypeOopPtr : public TypePtr {

 protected:

   TypeOopPtr(TYPES t, PTR ptr, ciKlass* k, bool xk, ciObject* o, int offset, int instance_id, const TypeOopPtr* speculative);

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   enum {

    InstanceTop = -1,   // undefined instance

    InstanceBot = 0     // any possible instance

   };

 protected:

   // Oop is NULL, unless this is a constant oop.

   ciObject*     _const_oop;   // Constant oop

   // If _klass is NULL, then so is _sig.  This is an unloaded klass.

   ciKlass*      _klass;       // Klass object

   // Does the type exclude subclasses of the klass?  (Inexact == polymorphic.)

   bool          _klass_is_exact;

   bool          _is_ptr_to_narrowoop;

   bool          _is_ptr_to_narrowklass;

   bool          _is_ptr_to_boxed_value;

   // If not InstanceTop or InstanceBot, indicates that this is

   // a particular instance of this type which is distinct.

   // This is the the node index of the allocation node creating this instance.

   int           _instance_id;

   // Extra type information profiling gave us. We propagate it the

   // same way the rest of the type info is propagated. If we want to

   // use it, then we have to emit a guard: this part of the type is

   // not something we know but something we speculate about the type.

   const TypeOopPtr*   _speculative;

   static const TypeOopPtr* make_from_klass_common(ciKlass* klass, bool klass_change, bool try_for_exact);

   int dual_instance_id() const;

   int meet_instance_id(int uid) const;

   // utility methods to work on the speculative part of the type

   const TypeOopPtr* dual_speculative() const;

   const TypeOopPtr* xmeet_speculative(const TypeOopPtr* other) const;

   bool eq_speculative(const TypeOopPtr* other) const;

   int hash_speculative() const;

   const TypeOopPtr* add_offset_speculative(intptr_t offset) const;

 #ifndef PRODUCT

   void dump_speculative(outputStream *st) const;

 #endif

   // Do not allow interface-vs.-noninterface joins to collapse to top.

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

 public:

   // Creates a type given a klass. Correctly handles multi-dimensional arrays

   // Respects UseUniqueSubclasses.

   // If the klass is final, the resulting type will be exact.

   static const TypeOopPtr* make_from_klass(ciKlass* klass) {

     return make_from_klass_common(klass, true, false);

   }

   // Same as before, but will produce an exact type, even if

   // the klass is not final, as long as it has exactly one implementation.

   static const TypeOopPtr* make_from_klass_unique(ciKlass* klass) {

     return make_from_klass_common(klass, true, true);

   }

   // Same as before, but does not respects UseUniqueSubclasses.

   // Use this only for creating array element types.

   static const TypeOopPtr* make_from_klass_raw(ciKlass* klass) {

     return make_from_klass_common(klass, false, false);

   }

   // Creates a singleton type given an object.

   // If the object cannot be rendered as a constant,

   // may return a non-singleton type.

   // If require_constant, produce a NULL if a singleton is not possible.

   static const TypeOopPtr* make_from_constant(ciObject* o,

                                               bool require_constant = false,

                                               bool not_null_elements = false);

   // Make a generic (unclassed) pointer to an oop.

   static const TypeOopPtr* make(PTR ptr, int offset, int instance_id, const TypeOopPtr* speculative);

   ciObject* const_oop()    const { return _const_oop; }

   virtual ciKlass* klass() const { return _klass;     }

   bool klass_is_exact()    const { return _klass_is_exact; }

   // Returns true if this pointer points at memory which contains a

   // compressed oop references.

   bool is_ptr_to_narrowoop_nv() const { return _is_ptr_to_narrowoop; }

   bool is_ptr_to_narrowklass_nv() const { return _is_ptr_to_narrowklass; }

   bool is_ptr_to_boxed_value()   const { return _is_ptr_to_boxed_value; }

   bool is_known_instance()       const { return _instance_id > 0; }

   int  instance_id()             const { return _instance_id; }

   bool is_known_instance_field() const { return is_known_instance() && _offset >= 0; }

   const TypeOopPtr* speculative() const { return _speculative; }

   virtual intptr_t get_con() const;

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual const Type *cast_to_exactness(bool klass_is_exact) const;

   virtual const TypeOopPtr *cast_to_instance_id(int instance_id) const;

   // corresponding pointer to klass, for a given instance

   const TypeKlassPtr* as_klass_type() const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   // Return same type without a speculative part

   virtual const Type* remove_speculative() const;

   virtual const Type *xmeet(const Type *t) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // the core of the computation of the meet for TypeOopPtr and for its subclasses

   virtual const Type *xmeet_helper(const Type *t) const;

   // Convenience common pre-built type.

   static const TypeOopPtr *BOTTOM;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

   // Return the speculative type if any

   ciKlass* speculative_type() const {

     if (_speculative != NULL) {

       const TypeOopPtr* speculative = _speculative->join(this)->is_oopptr();

       if (speculative->klass_is_exact()) {

        return speculative->klass();

       }

     }

     return NULL;

   }

 };

 //------------------------------TypeInstPtr------------------------------------

 // Class of Java object pointers, pointing either to non-array Java instances

 // or to a Klass* (including array klasses).

 class TypeInstPtr : public TypeOopPtr {

   TypeInstPtr(PTR ptr, ciKlass* k, bool xk, ciObject* o, int offset, int instance_id, const TypeOopPtr* speculative);

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   ciSymbol*  _name;        // class name

  public:

   ciSymbol* name()         const { return _name; }

   bool  is_loaded() const { return _klass->is_loaded(); }

   // Make a pointer to a constant oop.

   static const TypeInstPtr *make(ciObject* o) {

     return make(TypePtr::Constant, o->klass(), true, o, 0, InstanceBot);

   }

   // Make a pointer to a constant oop with offset.

   static const TypeInstPtr *make(ciObject* o, int offset) {

     return make(TypePtr::Constant, o->klass(), true, o, offset, InstanceBot);

   }

   // Make a pointer to some value of type klass.

   static const TypeInstPtr *make(PTR ptr, ciKlass* klass) {

     return make(ptr, klass, false, NULL, 0, InstanceBot);

   }

   // Make a pointer to some non-polymorphic value of exactly type klass.

   static const TypeInstPtr *make_exact(PTR ptr, ciKlass* klass) {

     return make(ptr, klass, true, NULL, 0, InstanceBot);

   }

   // Make a pointer to some value of type klass with offset.

   static const TypeInstPtr *make(PTR ptr, ciKlass* klass, int offset) {

     return make(ptr, klass, false, NULL, offset, InstanceBot);

   }

   // Make a pointer to an oop.

   static const TypeInstPtr *make(PTR ptr, ciKlass* k, bool xk, ciObject* o, int offset, int instance_id = InstanceBot, const TypeOopPtr* speculative = NULL);

   /** Create constant type for a constant boxed value */

   const Type* get_const_boxed_value() const;

   // If this is a java.lang.Class constant, return the type for it or NULL.

   // Pass to Type::get_const_type to turn it to a type, which will usually

   // be a TypeInstPtr, but may also be a TypeInt::INT for int.class, etc.

   ciType* java_mirror_type() const;

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual const Type *cast_to_exactness(bool klass_is_exact) const;

   virtual const TypeOopPtr *cast_to_instance_id(int instance_id) const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   // Return same type without a speculative part

   virtual const Type* remove_speculative() const;

   // the core of the computation of the meet of 2 types

   virtual const Type *xmeet_helper(const Type *t) const;

   virtual const TypeInstPtr *xmeet_unloaded( const TypeInstPtr *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   // Convenience common pre-built types.

   static const TypeInstPtr *NOTNULL;

   static const TypeInstPtr *BOTTOM;

   static const TypeInstPtr *MIRROR;

   static const TypeInstPtr *MARK;

   static const TypeInstPtr *KLASS;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const; // Specialized per-Type dumping

 #endif

 };

 //------------------------------TypeAryPtr-------------------------------------

 // Class of Java array pointers

 class TypeAryPtr : public TypeOopPtr {

   TypeAryPtr( PTR ptr, ciObject* o, const TypeAry *ary, ciKlass* k, bool xk,

               int offset, int instance_id, bool is_autobox_cache, const TypeOopPtr* speculative)

     : TypeOopPtr(AryPtr,ptr,k,xk,o,offset, instance_id, speculative),

     _ary(ary),

     _is_autobox_cache(is_autobox_cache)

  {

 #ifdef ASSERT

     if (k != NULL) {

       // Verify that specified klass and TypeAryPtr::klass() follow the same rules.

       ciKlass* ck = compute_klass(true);

       if (k != ck) {

         this->dump(); tty->cr();

         tty->print(" k: ");

         k->print(); tty->cr();

         tty->print("ck: ");

         if (ck != NULL) ck->print();

         else tty->print("<NULL>");

         tty->cr();

         assert(false, "unexpected TypeAryPtr::_klass");

       }

     }

 #endif

   }

   virtual bool eq( const Type *t ) const;

   virtual int hash() const;     // Type specific hashing

   const TypeAry *_ary;          // Array we point into

   const bool     _is_autobox_cache;

   ciKlass* compute_klass(DEBUG_ONLY(bool verify = false)) const;

 public:

   // Accessors

   ciKlass* klass() const;

   const TypeAry* ary() const  { return _ary; }

   const Type*    elem() const { return _ary->_elem; }

   const TypeInt* size() const { return _ary->_size; }

   bool      is_stable() const { return _ary->_stable; }

   bool is_autobox_cache() const { return _is_autobox_cache; }

   static const TypeAryPtr *make( PTR ptr, const TypeAry *ary, ciKlass* k, bool xk, int offset, int instance_id = InstanceBot, const TypeOopPtr* speculative = NULL);

   // Constant pointer to array

   static const TypeAryPtr *make( PTR ptr, ciObject* o, const TypeAry *ary, ciKlass* k, bool xk, int offset, int instance_id = InstanceBot, const TypeOopPtr* speculative = NULL, bool is_autobox_cache = false);

   // Return a 'ptr' version of this type

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual const Type *cast_to_exactness(bool klass_is_exact) const;

   virtual const TypeOopPtr *cast_to_instance_id(int instance_id) const;

   virtual const TypeAryPtr* cast_to_size(const TypeInt* size) const;

   virtual const TypeInt* narrow_size_type(const TypeInt* size) const;

   virtual bool empty(void) const;        // TRUE if type is vacuous

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   // Return same type without a speculative part

   virtual const Type* remove_speculative() const;

   // the core of the computation of the meet of 2 types

   virtual const Type *xmeet_helper(const Type *t) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   const TypeAryPtr* cast_to_stable(bool stable, int stable_dimension = 1) const;

   int stable_dimension() const;

   // Convenience common pre-built types.

   static const TypeAryPtr *RANGE;

   static const TypeAryPtr *OOPS;

   static const TypeAryPtr *NARROWOOPS;

   static const TypeAryPtr *BYTES;

   static const TypeAryPtr *SHORTS;

   static const TypeAryPtr *CHARS;

   static const TypeAryPtr *INTS;

   static const TypeAryPtr *LONGS;

   static const TypeAryPtr *FLOATS;

   static const TypeAryPtr *DOUBLES;

   // selects one of the above:

   static const TypeAryPtr *get_array_body_type(BasicType elem) {

     assert((uint)elem <= T_CONFLICT && _array_body_type[elem] != NULL, "bad elem type");

     return _array_body_type[elem];

   }

   static const TypeAryPtr *_array_body_type[T_CONFLICT+1];

   // sharpen the type of an int which is used as an array size

 #ifdef ASSERT

   // One type is interface, the other is oop

   virtual bool interface_vs_oop(const Type *t) const;

 #endif

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const; // Specialized per-Type dumping

 #endif

 };

 //------------------------------TypeMetadataPtr-------------------------------------

 // Some kind of metadata, either Method*, MethodData* or CPCacheOop

 class TypeMetadataPtr : public TypePtr {

 protected:

   TypeMetadataPtr(PTR ptr, ciMetadata* metadata, int offset);

   // Do not allow interface-vs.-noninterface joins to collapse to top.

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

 private:

   ciMetadata*   _metadata;

 public:

   static const TypeMetadataPtr* make(PTR ptr, ciMetadata* m, int offset);

   static const TypeMetadataPtr* make(ciMethod* m);

   static const TypeMetadataPtr* make(ciMethodData* m);

   ciMetadata* metadata() const { return _metadata; }

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   virtual intptr_t get_con() const;

   // Convenience common pre-built types.

   static const TypeMetadataPtr *BOTTOM;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeKlassPtr-----------------------------------

 // Class of Java Klass pointers

 class TypeKlassPtr : public TypePtr {

   TypeKlassPtr( PTR ptr, ciKlass* klass, int offset );

 protected:

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

  public:

   virtual bool eq( const Type *t ) const;

   virtual int hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

  private:

   static const TypeKlassPtr* make_from_klass_common(ciKlass* klass, bool klass_change, bool try_for_exact);

   ciKlass* _klass;

   // Does the type exclude subclasses of the klass?  (Inexact == polymorphic.)

   bool          _klass_is_exact;

 public:

   ciSymbol* name()  const { return klass()->name(); }

   ciKlass* klass() const { return  _klass; }

   bool klass_is_exact()    const { return _klass_is_exact; }

   bool  is_loaded() const { return klass()->is_loaded(); }

   // Creates a type given a klass. Correctly handles multi-dimensional arrays

   // Respects UseUniqueSubclasses.

   // If the klass is final, the resulting type will be exact.

   static const TypeKlassPtr* make_from_klass(ciKlass* klass) {

     return make_from_klass_common(klass, true, false);

   }

   // Same as before, but will produce an exact type, even if

   // the klass is not final, as long as it has exactly one implementation.

   static const TypeKlassPtr* make_from_klass_unique(ciKlass* klass) {

     return make_from_klass_common(klass, true, true);

   }

   // Same as before, but does not respects UseUniqueSubclasses.

   // Use this only for creating array element types.

   static const TypeKlassPtr* make_from_klass_raw(ciKlass* klass) {

     return make_from_klass_common(klass, false, false);

   }

   // Make a generic (unclassed) pointer to metadata.

   static const TypeKlassPtr* make(PTR ptr, int offset);

   // ptr to klass 'k'

   static const TypeKlassPtr *make( ciKlass* k ) { return make( TypePtr::Constant, k, 0); }

   // ptr to klass 'k' with offset

   static const TypeKlassPtr *make( ciKlass* k, int offset ) { return make( TypePtr::Constant, k, offset); }

   // ptr to klass 'k' or sub-klass

   static const TypeKlassPtr *make( PTR ptr, ciKlass* k, int offset);

   virtual const Type *cast_to_ptr_type(PTR ptr) const;

   virtual const Type *cast_to_exactness(bool klass_is_exact) const;

   // corresponding pointer to instance, for a given class

   const TypeOopPtr* as_instance_type() const;

   virtual const TypePtr *add_offset( intptr_t offset ) const;

   virtual const Type    *xmeet( const Type *t ) const;

   virtual const Type    *xdual() const;      // Compute dual right now.

   virtual intptr_t get_con() const;

   // Convenience common pre-built types.

   static const TypeKlassPtr* OBJECT; // Not-null object klass or below

   static const TypeKlassPtr* OBJECT_OR_NULL; // Maybe-null version of same

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const; // Specialized per-Type dumping

 #endif

 };

 class TypeNarrowPtr : public Type {

 protected:

   const TypePtr* _ptrtype; // Could be TypePtr::NULL_PTR

   TypeNarrowPtr(TYPES t, const TypePtr* ptrtype): _ptrtype(ptrtype),

                                                   Type(t) {

     assert(ptrtype->offset() == 0 ||

            ptrtype->offset() == OffsetBot ||

            ptrtype->offset() == OffsetTop, "no real offsets");

   }

   virtual const TypeNarrowPtr *isa_same_narrowptr(const Type *t) const = 0;

   virtual const TypeNarrowPtr *is_same_narrowptr(const Type *t) const = 0;

   virtual const TypeNarrowPtr *make_same_narrowptr(const TypePtr *t) const = 0;

   virtual const TypeNarrowPtr *make_hash_same_narrowptr(const TypePtr *t) const = 0;

   // Do not allow interface-vs.-noninterface joins to collapse to top.

   virtual const Type *filter_helper(const Type *kills, bool include_speculative) const;

 public:

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   virtual intptr_t get_con() const;

   virtual bool empty(void) const;        // TRUE if type is vacuous

   // returns the equivalent ptr type for this compressed pointer

   const TypePtr *get_ptrtype() const {

     return _ptrtype;

   }

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeNarrowOop----------------------------------

 // A compressed reference to some kind of Oop.  This type wraps around

 // a preexisting TypeOopPtr and forwards most of it's operations to

 // the underlying type.  It's only real purpose is to track the

 // oopness of the compressed oop value when we expose the conversion

 // between the normal and the compressed form.

 class TypeNarrowOop : public TypeNarrowPtr {

 protected:

   TypeNarrowOop( const TypePtr* ptrtype): TypeNarrowPtr(NarrowOop, ptrtype) {

   }

   virtual const TypeNarrowPtr *isa_same_narrowptr(const Type *t) const {

     return t->isa_narrowoop();

   }

   virtual const TypeNarrowPtr *is_same_narrowptr(const Type *t) const {

     return t->is_narrowoop();

   }

   virtual const TypeNarrowPtr *make_same_narrowptr(const TypePtr *t) const {

     return new TypeNarrowOop(t);

   }

   virtual const TypeNarrowPtr *make_hash_same_narrowptr(const TypePtr *t) const {

     return (const TypeNarrowPtr*)((new TypeNarrowOop(t))->hashcons());

   }

 public:

   static const TypeNarrowOop *make( const TypePtr* type);

   static const TypeNarrowOop* make_from_constant(ciObject* con, bool require_constant = false) {

     return make(TypeOopPtr::make_from_constant(con, require_constant));

   }

   static const TypeNarrowOop *BOTTOM;

   static const TypeNarrowOop *NULL_PTR;

   virtual const Type* remove_speculative() const {

     return make(_ptrtype->remove_speculative()->is_ptr());

   }

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeNarrowKlass----------------------------------

 // A compressed reference to klass pointer.  This type wraps around a

 // preexisting TypeKlassPtr and forwards most of it's operations to

 // the underlying type.

 class TypeNarrowKlass : public TypeNarrowPtr {

 protected:

   TypeNarrowKlass( const TypePtr* ptrtype): TypeNarrowPtr(NarrowKlass, ptrtype) {

   }

   virtual const TypeNarrowPtr *isa_same_narrowptr(const Type *t) const {

     return t->isa_narrowklass();

   }

   virtual const TypeNarrowPtr *is_same_narrowptr(const Type *t) const {

     return t->is_narrowklass();

   }

   virtual const TypeNarrowPtr *make_same_narrowptr(const TypePtr *t) const {

     return new TypeNarrowKlass(t);

   }

   virtual const TypeNarrowPtr *make_hash_same_narrowptr(const TypePtr *t) const {

     return (const TypeNarrowPtr*)((new TypeNarrowKlass(t))->hashcons());

   }

 public:

   static const TypeNarrowKlass *make( const TypePtr* type);

   // static const TypeNarrowKlass *BOTTOM;

   static const TypeNarrowKlass *NULL_PTR;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const;

 #endif

 };

 //------------------------------TypeFunc---------------------------------------

 // Class of Array Types

 class TypeFunc : public Type {

   TypeFunc( const TypeTuple *domain, const TypeTuple *range ) : Type(Function),  _domain(domain), _range(range) {}

   virtual bool eq( const Type *t ) const;

   virtual int  hash() const;             // Type specific hashing

   virtual bool singleton(void) const;    // TRUE if type is a singleton

   virtual bool empty(void) const;        // TRUE if type is vacuous

 public:

   // Constants are shared among ADLC and VM

   enum { Control    = AdlcVMDeps::Control,

          I_O        = AdlcVMDeps::I_O,

          Memory     = AdlcVMDeps::Memory,

          FramePtr   = AdlcVMDeps::FramePtr,

          ReturnAdr  = AdlcVMDeps::ReturnAdr,

          Parms      = AdlcVMDeps::Parms

   };

   const TypeTuple* const _domain;     // Domain of inputs

   const TypeTuple* const _range;      // Range of results

   // Accessors:

   const TypeTuple* domain() const { return _domain; }

   const TypeTuple* range()  const { return _range; }

   static const TypeFunc *make(ciMethod* method);

   static const TypeFunc *make(ciSignature signature, const Type* extra);

   static const TypeFunc *make(const TypeTuple* domain, const TypeTuple* range);

   virtual const Type *xmeet( const Type *t ) const;

   virtual const Type *xdual() const;    // Compute dual right now.

   BasicType return_type() const;

 #ifndef PRODUCT

   virtual void dump2( Dict &d, uint depth, outputStream *st ) const; // Specialized per-Type dumping

 #endif

   // Convenience common pre-built types.

 };

 //------------------------------accessors--------------------------------------

 inline bool Type::is_ptr_to_narrowoop() const {

 #ifdef _LP64

   return (isa_oopptr() != NULL && is_oopptr()->is_ptr_to_narrowoop_nv());

 #else

   return false;

 #endif

 }

 inline bool Type::is_ptr_to_narrowklass() const {

 #ifdef _LP64

   return (isa_oopptr() != NULL && is_oopptr()->is_ptr_to_narrowklass_nv());

 #else

   return false;

 #endif

 }

 inline float Type::getf() const {

   assert( _base == FloatCon, "Not a FloatCon" );

   return ((TypeF*)this)->_f;

 }

 inline double Type::getd() const {

   assert( _base == DoubleCon, "Not a DoubleCon" );

   return ((TypeD*)this)->_d;

 }

 inline const TypeInt *Type::is_int() const {

   assert( _base == Int, "Not an Int" );

   return (TypeInt*)this;

 }

 inline const TypeInt *Type::isa_int() const {

   return ( _base == Int ? (TypeInt*)this : NULL);

 }

 inline const TypeLong *Type::is_long() const {

   assert( _base == Long, "Not a Long" );

   return (TypeLong*)this;

 }

 inline const TypeLong *Type::isa_long() const {

   return ( _base == Long ? (TypeLong*)this : NULL);

 }

 inline const TypeF *Type::isa_float() const {

   return ((_base == FloatTop ||

            _base == FloatCon ||

            _base == FloatBot) ? (TypeF*)this : NULL);

 }

 inline const TypeF *Type::is_float_constant() const {

   assert( _base == FloatCon, "Not a Float" );

   return (TypeF*)this;

 }

 inline const TypeF *Type::isa_float_constant() const {

   return ( _base == FloatCon ? (TypeF*)this : NULL);

 }

 inline const TypeD *Type::isa_double() const {

   return ((_base == DoubleTop ||

            _base == DoubleCon ||

            _base == DoubleBot) ? (TypeD*)this : NULL);

 }

 inline const TypeD *Type::is_double_constant() const {

   assert( _base == DoubleCon, "Not a Double" );

   return (TypeD*)this;

 }

 inline const TypeD *Type::isa_double_constant() const {

   return ( _base == DoubleCon ? (TypeD*)this : NULL);

 }

 inline const TypeTuple *Type::is_tuple() const {

   assert( _base == Tuple, "Not a Tuple" );

   return (TypeTuple*)this;

 }

 inline const TypeAry *Type::is_ary() const {

   assert( _base == Array , "Not an Array" );

   return (TypeAry*)this;

 }

 inline const TypeVect *Type::is_vect() const {

   assert( _base >= VectorS && _base <= VectorY, "Not a Vector" );

   return (TypeVect*)this;

 }

 inline const TypeVect *Type::isa_vect() const {

   return (_base >= VectorS && _base <= VectorY) ? (TypeVect*)this : NULL;

 }

 inline const TypePtr *Type::is_ptr() const {

   // AnyPtr is the first Ptr and KlassPtr the last, with no non-ptrs between.

   assert(_base >= AnyPtr && _base <= KlassPtr, "Not a pointer");

   return (TypePtr*)this;

 }

 inline const TypePtr *Type::isa_ptr() const {

   // AnyPtr is the first Ptr and KlassPtr the last, with no non-ptrs between.

   return (_base >= AnyPtr && _base <= KlassPtr) ? (TypePtr*)this : NULL;

 }

 inline const TypeOopPtr *Type::is_oopptr() const {

   // OopPtr is the first and KlassPtr the last, with no non-oops between.

   assert(_base >= OopPtr && _base <= AryPtr, "Not a Java pointer" ) ;

   return (TypeOopPtr*)this;

 }

 inline const TypeOopPtr *Type::isa_oopptr() const {

   // OopPtr is the first and KlassPtr the last, with no non-oops between.

   return (_base >= OopPtr && _base <= AryPtr) ? (TypeOopPtr*)this : NULL;

 }

 inline const TypeRawPtr *Type::isa_rawptr() const {

   return (_base == RawPtr) ? (TypeRawPtr*)this : NULL;

 }

 inline const TypeRawPtr *Type::is_rawptr() const {

   assert( _base == RawPtr, "Not a raw pointer" );

   return (TypeRawPtr*)this;

 }

 inline const TypeInstPtr *Type::isa_instptr() const {

   return (_base == InstPtr) ? (TypeInstPtr*)this : NULL;

 }

 inline const TypeInstPtr *Type::is_instptr() const {

   assert( _base == InstPtr, "Not an object pointer" );

   return (TypeInstPtr*)this;

 }

 inline const TypeAryPtr *Type::isa_aryptr() const {

   return (_base == AryPtr) ? (TypeAryPtr*)this : NULL;

 }

 inline const TypeAryPtr *Type::is_aryptr() const {

   assert( _base == AryPtr, "Not an array pointer" );

   return (TypeAryPtr*)this;

 }

 inline const TypeNarrowOop *Type::is_narrowoop() const {

   // OopPtr is the first and KlassPtr the last, with no non-oops between.

   assert(_base == NarrowOop, "Not a narrow oop" ) ;

   return (TypeNarrowOop*)this;

 }

 inline const TypeNarrowOop *Type::isa_narrowoop() const {

   // OopPtr is the first and KlassPtr the last, with no non-oops between.

   return (_base == NarrowOop) ? (TypeNarrowOop*)this : NULL;

 }

 inline const TypeNarrowKlass *Type::is_narrowklass() const {

   assert(_base == NarrowKlass, "Not a narrow oop" ) ;

   return (TypeNarrowKlass*)this;

 }

 inline const TypeNarrowKlass *Type::isa_narrowklass() const {

   return (_base == NarrowKlass) ? (TypeNarrowKlass*)this : NULL;

 }

 inline const TypeMetadataPtr *Type::is_metadataptr() const {

   // MetadataPtr is the first and CPCachePtr the last

   assert(_base == MetadataPtr, "Not a metadata pointer" ) ;

   return (TypeMetadataPtr*)this;

 }

 inline const TypeMetadataPtr *Type::isa_metadataptr() const {

   return (_base == MetadataPtr) ? (TypeMetadataPtr*)this : NULL;

 }

 inline const TypeKlassPtr *Type::isa_klassptr() const {

   return (_base == KlassPtr) ? (TypeKlassPtr*)this : NULL;

 }

 inline const TypeKlassPtr *Type::is_klassptr() const {

   assert( _base == KlassPtr, "Not a klass pointer" );

   return (TypeKlassPtr*)this;

 }

 inline const TypePtr* Type::make_ptr() const {

   return (_base == NarrowOop) ? is_narrowoop()->get_ptrtype() :

     ((_base == NarrowKlass) ? is_narrowklass()->get_ptrtype() :

      (isa_ptr() ? is_ptr() : NULL));

 }

 inline const TypeOopPtr* Type::make_oopptr() const {

   return (_base == NarrowOop) ? is_narrowoop()->get_ptrtype()->is_oopptr() : is_oopptr();

 }

 inline const TypeNarrowOop* Type::make_narrowoop() const {

   return (_base == NarrowOop) ? is_narrowoop() :

                                 (isa_ptr() ? TypeNarrowOop::make(is_ptr()) : NULL);

 }

 inline const TypeNarrowKlass* Type::make_narrowklass() const {

   return (_base == NarrowKlass) ? is_narrowklass() :

                                 (isa_ptr() ? TypeNarrowKlass::make(is_ptr()) : NULL);

 }

 inline bool Type::is_floatingpoint() const {

   if( (_base == FloatCon)  || (_base == FloatBot) ||

       (_base == DoubleCon) || (_base == DoubleBot) )

     return true;

   return false;

 }

 inline bool Type::is_ptr_to_boxing_obj() const {

   const TypeInstPtr* tp = isa_instptr();

   return (tp != NULL) && (tp->offset() == 0) &&

          tp->klass()->is_instance_klass()  &&

          tp->klass()->as_instance_klass()->is_box_klass();

 }

 // ===============================================================

 // Things that need to be 64-bits in the 64-bit build but

 // 32-bits in the 32-bit build.  Done this way to get full

 // optimization AND strong typing.

 #ifdef _LP64

 // For type queries and asserts

 #define is_intptr_t  is_long

 #define isa_intptr_t isa_long

 #define find_intptr_t_type find_long_type

 #define find_intptr_t_con  find_long_con

 #define TypeX        TypeLong

 #define Type_X       Type::Long

 #define TypeX_X      TypeLong::LONG

 #define TypeX_ZERO   TypeLong::ZERO

 // For 'ideal_reg' machine registers

 #define Op_RegX      Op_RegL

 // For phase->intcon variants

 #define MakeConX     longcon

 #define ConXNode     ConLNode

 // For array index arithmetic

 #define MulXNode     MulLNode

 #define AndXNode     AndLNode

 #define OrXNode      OrLNode

 #define CmpXNode     CmpLNode

 #define SubXNode     SubLNode

 #define LShiftXNode  LShiftLNode

 // For object size computation:

 #define AddXNode     AddLNode

 #define RShiftXNode  RShiftLNode

 // For card marks and hashcodes

 #define URShiftXNode URShiftLNode

 // UseOptoBiasInlining

 #define XorXNode     XorLNode

 #define StoreXConditionalNode StoreLConditionalNode

 // Opcodes

 #define Op_LShiftX   Op_LShiftL

 #define Op_AndX      Op_AndL

 #define Op_AddX      Op_AddL

 #define Op_SubX      Op_SubL

 #define Op_XorX      Op_XorL

 #define Op_URShiftX  Op_URShiftL

 // conversions

 #define ConvI2X(x)   ConvI2L(x)

 #define ConvL2X(x)   (x)

 #define ConvX2I(x)   ConvL2I(x)

 #define ConvX2L(x)   (x)

 #else

 // For type queries and asserts

 #define is_intptr_t  is_int

 #define isa_intptr_t isa_int

 #define find_intptr_t_type find_int_type

 #define find_intptr_t_con  find_int_con

 #define TypeX        TypeInt

 #define Type_X       Type::Int

 #define TypeX_X      TypeInt::INT

 #define TypeX_ZERO   TypeInt::ZERO

 // For 'ideal_reg' machine registers

 #define Op_RegX      Op_RegI

 // For phase->intcon variants

 #define MakeConX     intcon

 #define ConXNode     ConINode

 // For array index arithmetic

 #define MulXNode     MulINode

 #define AndXNode     AndINode

 #define OrXNode      OrINode

 #define CmpXNode     CmpINode

 #define SubXNode     SubINode

 #define LShiftXNode  LShiftINode

 // For object size computation:

 #define AddXNode     AddINode

 #define RShiftXNode  RShiftINode

 // For card marks and hashcodes

 #define URShiftXNode URShiftINode

 // UseOptoBiasInlining

 #define XorXNode     XorINode

 #define StoreXConditionalNode StoreIConditionalNode

 // Opcodes

 #define Op_LShiftX   Op_LShiftI

 #define Op_AndX      Op_AndI

 #define Op_AddX      Op_AddI

 #define Op_SubX      Op_SubI

 #define Op_XorX      Op_XorI

 #define Op_URShiftX  Op_URShiftI

 // conversions

 #define ConvI2X(x)   (x)

 #define ConvL2X(x)   ConvL2I(x)

 #define ConvX2I(x)   (x)

 #define ConvX2L(x)   ConvI2L(x)

 #endif

 #endif // SHARE_VM_OPTO_TYPE_HPP