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 /*

  * 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.

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  */

 #ifndef SHARE_VM_OPTO_MACHNODE_HPP

 #define SHARE_VM_OPTO_MACHNODE_HPP

 #include "opto/callnode.hpp"

 #include "opto/matcher.hpp"

 #include "opto/multnode.hpp"

 #include "opto/node.hpp"

 #include "opto/regmask.hpp"

 class BufferBlob;

 class CodeBuffer;

 class JVMState;

 class MachCallDynamicJavaNode;

 class MachCallJavaNode;

 class MachCallLeafNode;

 class MachCallNode;

 class MachCallRuntimeNode;

 class MachCallStaticJavaNode;

 class MachEpilogNode;

 class MachIfNode;

 class MachNullCheckNode;

 class MachOper;

 class MachProjNode;

 class MachPrologNode;

 class MachReturnNode;

 class MachSafePointNode;

 class MachSpillCopyNode;

 class Matcher;

 class PhaseRegAlloc;

 class RegMask;

 class State;

 //---------------------------MachOper------------------------------------------

 class MachOper : public ResourceObj {

 public:

   // Allocate right next to the MachNodes in the same arena

   void *operator new( size_t x, Compile* C ) throw() { return C->node_arena()->Amalloc_D(x); }

   // Opcode

   virtual uint opcode() const = 0;

   // Number of input edges.

   // Generally at least 1

   virtual uint num_edges() const { return 1; }

   // Array of Register masks

   virtual const RegMask *in_RegMask(int index) const;

   // Methods to output the encoding of the operand

   // Negate conditional branches.  Error for non-branch Nodes

   virtual void negate();

   // Return the value requested

   // result register lookup, corresponding to int_format

   virtual int  reg(PhaseRegAlloc *ra_, const Node *node)   const;

   // input register lookup, corresponding to ext_format

   virtual int  reg(PhaseRegAlloc *ra_, const Node *node, int idx)   const;

   // helpers for MacroAssembler generation from ADLC

   Register  as_Register(PhaseRegAlloc *ra_, const Node *node)   const {

     return ::as_Register(reg(ra_, node));

   }

   Register  as_Register(PhaseRegAlloc *ra_, const Node *node, int idx)   const {

     return ::as_Register(reg(ra_, node, idx));

   }

   FloatRegister  as_FloatRegister(PhaseRegAlloc *ra_, const Node *node)   const {

     return ::as_FloatRegister(reg(ra_, node));

   }

   FloatRegister  as_FloatRegister(PhaseRegAlloc *ra_, const Node *node, int idx)   const {

     return ::as_FloatRegister(reg(ra_, node, idx));

   }

 #if defined(IA32) || defined(AMD64)

   XMMRegister  as_XMMRegister(PhaseRegAlloc *ra_, const Node *node)   const {

     return ::as_XMMRegister(reg(ra_, node));

   }

   XMMRegister  as_XMMRegister(PhaseRegAlloc *ra_, const Node *node, int idx)   const {

     return ::as_XMMRegister(reg(ra_, node, idx));

   }

 #endif

   virtual intptr_t  constant() const;

   virtual relocInfo::relocType constant_reloc() const;

   virtual jdouble constantD() const;

   virtual jfloat  constantF() const;

   virtual jlong   constantL() const;

   virtual TypeOopPtr *oop() const;

   virtual int  ccode() const;

   // A zero, default, indicates this value is not needed.

   // May need to lookup the base register, as done in int_ and ext_format

   virtual int  base (PhaseRegAlloc *ra_, const Node *node, int idx) const;

   virtual int  index(PhaseRegAlloc *ra_, const Node *node, int idx) const;

   virtual int  scale() const;

   // Parameters needed to support MEMORY_INTERFACE access to stackSlot

   virtual int  disp (PhaseRegAlloc *ra_, const Node *node, int idx) const;

   // Check for PC-Relative displacement

   virtual relocInfo::relocType disp_reloc() const;

   virtual int  constant_disp() const;   // usu. 0, may return Type::OffsetBot

   virtual int  base_position()  const;  // base edge position, or -1

   virtual int  index_position() const;  // index edge position, or -1

   // Access the TypeKlassPtr of operands with a base==RegI and disp==RegP

   // Only returns non-null value for i486.ad's indOffset32X

   virtual const TypePtr *disp_as_type() const { return NULL; }

   // Return the label

   virtual Label *label() const;

   // Return the method's address

   virtual intptr_t  method() const;

   // Hash and compare over operands are currently identical

   virtual uint  hash() const;

   virtual uint  cmp( const MachOper &oper ) const;

   // Virtual clone, since I do not know how big the MachOper is.

   virtual MachOper *clone(Compile* C) const = 0;

   // Return ideal Type from simple operands.  Fail for complex operands.

   virtual const Type *type() const;

   // Set an integer offset if we have one, or error otherwise

   virtual void set_con( jint c0 ) { ShouldNotReachHere();  }

 #ifndef PRODUCT

   // Return name of operand

   virtual const char    *Name() const { return "???";}

   // Methods to output the text version of the operand

   virtual void int_format(PhaseRegAlloc *,const MachNode *node, outputStream *st) const = 0;

   virtual void ext_format(PhaseRegAlloc *,const MachNode *node,int idx, outputStream *st) const=0;

   virtual void dump_spec(outputStream *st) const; // Print per-operand info

   // Check whether o is a valid oper.

   static bool notAnOper(const MachOper *o) {

     if (o == NULL)                   return true;

     if (((intptr_t)o & 1) != 0)      return true;

     if (*(address*)o == badAddress)  return true;  // kill by Node::destruct

     return false;

   }

 #endif // !PRODUCT

 };

 //------------------------------MachNode---------------------------------------

 // Base type for all machine specific nodes.  All node classes generated by the

 // ADLC inherit from this class.

 class MachNode : public Node {

 public:

   MachNode() : Node((uint)0), _num_opnds(0), _opnds(NULL) {

     init_class_id(Class_Mach);

   }

   // Required boilerplate

   virtual uint size_of() const { return sizeof(MachNode); }

   virtual int  Opcode() const;          // Always equal to MachNode

   virtual uint rule() const = 0;        // Machine-specific opcode

   // Number of inputs which come before the first operand.

   // Generally at least 1, to skip the Control input

   virtual uint oper_input_base() const { return 1; }

   // Copy inputs and operands to new node of instruction.

   // Called from cisc_version() and short_branch_version().

   // !!!! The method's body is defined in ad_<arch>.cpp file.

   void fill_new_machnode(MachNode *n, Compile* C) const;

   // Return an equivalent instruction using memory for cisc_operand position

   virtual MachNode *cisc_version(int offset, Compile* C);

   // Modify this instruction's register mask to use stack version for cisc_operand

   virtual void use_cisc_RegMask();

   // Support for short branches

   bool may_be_short_branch() const { return (flags() & Flag_may_be_short_branch) != 0; }

   // Avoid back to back some instructions on some CPUs.

   bool avoid_back_to_back() const { return (flags() & Flag_avoid_back_to_back) != 0; }

   // instruction implemented with a call

   bool has_call() const { return (flags() & Flag_has_call) != 0; }

   // First index in _in[] corresponding to operand, or -1 if there is none

   int  operand_index(uint operand) const;

   // Register class input is expected in

   virtual const RegMask &in_RegMask(uint) const;

   // cisc-spillable instructions redefine for use by in_RegMask

   virtual const RegMask *cisc_RegMask() const { return NULL; }

   // If this instruction is a 2-address instruction, then return the

   // index of the input which must match the output.  Not nessecary

   // for instructions which bind the input and output register to the

   // same singleton regiser (e.g., Intel IDIV which binds AX to be

   // both an input and an output).  It is nessecary when the input and

   // output have choices - but they must use the same choice.

   virtual uint two_adr( ) const { return 0; }

   // Array of complex operand pointers.  Each corresponds to zero or

   // more leafs.  Must be set by MachNode constructor to point to an

   // internal array of MachOpers.  The MachOper array is sized by

   // specific MachNodes described in the ADL.

   uint _num_opnds;

   MachOper **_opnds;

   uint  num_opnds() const { return _num_opnds; }

   // Emit bytes into cbuf

   virtual void  emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   // Expand node after register allocation.

   // Node is replaced by several nodes in the postalloc expand phase.

   // Corresponding methods are generated for nodes if they specify

   // postalloc_expand. See block.cpp for more documentation.

   virtual bool requires_postalloc_expand() const { return false; }

   virtual void postalloc_expand(GrowableArray <Node *> *nodes, PhaseRegAlloc *ra_);

   // Size of instruction in bytes

   virtual uint  size(PhaseRegAlloc *ra_) const;

   // Helper function that computes size by emitting code

   virtual uint  emit_size(PhaseRegAlloc *ra_) const;

   // Return the alignment required (in units of relocInfo::addr_unit())

   // for this instruction (must be a power of 2)

   virtual int   alignment_required() const { return 1; }

   // Return the padding (in bytes) to be emitted before this

   // instruction to properly align it.

   virtual int   compute_padding(int current_offset) const { return 0; }

   // Return number of relocatable values contained in this instruction

   virtual int   reloc() const { return 0; }

   // Hash and compare over operands.  Used to do GVN on machine Nodes.

   virtual uint  hash() const;

   virtual uint  cmp( const Node &n ) const;

   // Expand method for MachNode, replaces nodes representing pseudo

   // instructions with a set of nodes which represent real machine

   // instructions and compute the same value.

   virtual MachNode *Expand( State *, Node_List &proj_list, Node* mem ) { return this; }

   // Bottom_type call; value comes from operand0

   virtual const class Type *bottom_type() const { return _opnds[0]->type(); }

   virtual uint ideal_reg() const { const Type *t = _opnds[0]->type(); return t == TypeInt::CC ? Op_RegFlags : t->ideal_reg(); }

   // If this is a memory op, return the base pointer and fixed offset.

   // If there are no such, return NULL.  If there are multiple addresses

   // or the address is indeterminate (rare cases) then return (Node*)-1,

   // which serves as node bottom.

   // If the offset is not statically determined, set it to Type::OffsetBot.

   // This method is free to ignore stack slots if that helps.

   #define TYPE_PTR_SENTINAL  ((const TypePtr*)-1)

   // Passing TYPE_PTR_SENTINAL as adr_type asks for computation of the adr_type if possible

   const Node* get_base_and_disp(intptr_t &offset, const TypePtr* &adr_type) const;

   // Helper for get_base_and_disp: find the base and index input nodes.

   // Returns the MachOper as determined by memory_operand(), for use, if

   // needed by the caller. If (MachOper *)-1 is returned, base and index

   // are set to NodeSentinel. If (MachOper *) NULL is returned, base and

   // index are set to NULL.

   const MachOper* memory_inputs(Node* &base, Node* &index) const;

   // Helper for memory_inputs:  Which operand carries the necessary info?

   // By default, returns NULL, which means there is no such operand.

   // If it returns (MachOper*)-1, this means there are multiple memories.

   virtual const MachOper* memory_operand() const { return NULL; }

   // Call "get_base_and_disp" to decide which category of memory is used here.

   virtual const class TypePtr *adr_type() const;

   // Apply peephole rule(s) to this instruction

   virtual MachNode *peephole( Block *block, int block_index, PhaseRegAlloc *ra_, int &deleted, Compile* C );

   // Top-level ideal Opcode matched

   virtual int ideal_Opcode()     const { return Op_Node; }

   // Adds the label for the case

   virtual void add_case_label( int switch_val, Label* blockLabel);

   // Set the absolute address for methods

   virtual void method_set( intptr_t addr );

   // Should we clone rather than spill this instruction?

   bool rematerialize() const;

   // Get the pipeline info

   static const Pipeline *pipeline_class();

   virtual const Pipeline *pipeline() const;

 #ifndef PRODUCT

   virtual const char *Name() const = 0; // Machine-specific name

   virtual void dump_spec(outputStream *st) const; // Print per-node info

   void         dump_format(PhaseRegAlloc *ra, outputStream *st) const; // access to virtual

 #endif

 };

 //------------------------------MachIdealNode----------------------------

 // Machine specific versions of nodes that must be defined by user.

 // These are not converted by matcher from ideal nodes to machine nodes

 // but are inserted into the code by the compiler.

 class MachIdealNode : public MachNode {

 public:

   MachIdealNode( ) {}

   // Define the following defaults for non-matched machine nodes

   virtual uint oper_input_base() const { return 0; }

   virtual uint rule()            const { return 9999999; }

   virtual const class Type *bottom_type() const { return _opnds == NULL ? Type::CONTROL : MachNode::bottom_type(); }

 };

 //------------------------------MachTypeNode----------------------------

 // Machine Nodes that need to retain a known Type.

 class MachTypeNode : public MachNode {

   virtual uint size_of() const { return sizeof(*this); } // Size is bigger

 public:

   MachTypeNode( ) {}

   const Type *_bottom_type;

   virtual const class Type *bottom_type() const { return _bottom_type; }

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachBreakpointNode----------------------------

 // Machine breakpoint or interrupt Node

 class MachBreakpointNode : public MachIdealNode {

 public:

   MachBreakpointNode( ) {}

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "Breakpoint"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachConstantBaseNode--------------------------

 // Machine node that represents the base address of the constant table.

 class MachConstantBaseNode : public MachIdealNode {

 public:

   static const RegMask& _out_RegMask;  // We need the out_RegMask statically in MachConstantNode::in_RegMask().

 public:

   MachConstantBaseNode() : MachIdealNode() {

     init_class_id(Class_MachConstantBase);

   }

   virtual const class Type* bottom_type() const { return TypeRawPtr::NOTNULL; }

   virtual uint ideal_reg() const { return Op_RegP; }

   virtual uint oper_input_base() const { return 1; }

   virtual bool requires_postalloc_expand() const;

   virtual void postalloc_expand(GrowableArray <Node *> *nodes, PhaseRegAlloc *ra_);

   virtual void emit(CodeBuffer& cbuf, PhaseRegAlloc* ra_) const;

   virtual uint size(PhaseRegAlloc* ra_) const;

   virtual bool pinned() const { return UseRDPCForConstantTableBase; }

   static const RegMask& static_out_RegMask() { return _out_RegMask; }

   virtual const RegMask& out_RegMask() const { return static_out_RegMask(); }

 #ifndef PRODUCT

   virtual const char* Name() const { return "MachConstantBaseNode"; }

   virtual void format(PhaseRegAlloc*, outputStream* st) const;

 #endif

 };

 //------------------------------MachConstantNode-------------------------------

 // Machine node that holds a constant which is stored in the constant table.

 class MachConstantNode : public MachTypeNode {

 protected:

   Compile::Constant _constant;  // This node's constant.

 public:

   MachConstantNode() : MachTypeNode() {

     init_class_id(Class_MachConstant);

   }

   virtual void eval_constant(Compile* C) {

 #ifdef ASSERT

     tty->print("missing MachConstantNode eval_constant function: ");

     dump();

 #endif

     ShouldNotCallThis();

   }

   virtual const RegMask &in_RegMask(uint idx) const {

     if (idx == mach_constant_base_node_input())

       return MachConstantBaseNode::static_out_RegMask();

     return MachNode::in_RegMask(idx);

   }

   // Input edge of MachConstantBaseNode.

   uint mach_constant_base_node_input() const { return req() - 1; }

   int  constant_offset();

   int  constant_offset() const { return ((MachConstantNode*) this)->constant_offset(); }

   // Unchecked version to avoid assertions in debug output.

   int  constant_offset_unchecked() const;

 };

 //------------------------------MachUEPNode-----------------------------------

 // Machine Unvalidated Entry Point Node

 class MachUEPNode : public MachIdealNode {

 public:

   MachUEPNode( ) {}

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "Unvalidated-Entry-Point"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachPrologNode--------------------------------

 // Machine function Prolog Node

 class MachPrologNode : public MachIdealNode {

 public:

   MachPrologNode( ) {}

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

   virtual int reloc() const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "Prolog"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachEpilogNode--------------------------------

 // Machine function Epilog Node

 class MachEpilogNode : public MachIdealNode {

 public:

   MachEpilogNode(bool do_poll = false) : _do_polling(do_poll) {}

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

   virtual int reloc() const;

   virtual const Pipeline *pipeline() const;

 private:

   bool _do_polling;

 public:

   bool do_polling() const { return _do_polling; }

   // Offset of safepoint from the beginning of the node

   int safepoint_offset() const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "Epilog"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachNopNode-----------------------------------

 // Machine function Nop Node

 class MachNopNode : public MachIdealNode {

 private:

   int _count;

 public:

   MachNopNode( ) : _count(1) {}

   MachNopNode( int count ) : _count(count) {}

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

   virtual const class Type *bottom_type() const { return Type::CONTROL; }

   virtual int ideal_Opcode() const { return Op_Con; } // bogus; see output.cpp

   virtual const Pipeline *pipeline() const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "Nop"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

   virtual void dump_spec(outputStream *st) const { } // No per-operand info

 #endif

 };

 //------------------------------MachSpillCopyNode------------------------------

 // Machine SpillCopy Node.  Copies 1 or 2 words from any location to any

 // location (stack or register).

 class MachSpillCopyNode : public MachIdealNode {

   const RegMask *_in;           // RegMask for input

   const RegMask *_out;          // RegMask for output

   const Type *_type;

 public:

   MachSpillCopyNode( Node *n, const RegMask &in, const RegMask &out ) :

     MachIdealNode(), _in(&in), _out(&out), _type(n->bottom_type()) {

     init_class_id(Class_MachSpillCopy);

     init_flags(Flag_is_Copy);

     add_req(NULL);

     add_req(n);

   }

   virtual uint size_of() const { return sizeof(*this); }

   void set_out_RegMask(const RegMask &out) { _out = &out; }

   void set_in_RegMask(const RegMask &in) { _in = ∈ }

   virtual const RegMask &out_RegMask() const { return *_out; }

   virtual const RegMask &in_RegMask(uint) const { return *_in; }

   virtual const class Type *bottom_type() const { return _type; }

   virtual uint ideal_reg() const { return _type->ideal_reg(); }

   virtual uint oper_input_base() const { return 1; }

   uint implementation( CodeBuffer *cbuf, PhaseRegAlloc *ra_, bool do_size, outputStream* st ) const;

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual uint size(PhaseRegAlloc *ra_) const;

 #ifndef PRODUCT

   virtual const char *Name() const { return "MachSpillCopy"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachBranchNode--------------------------------

 // Abstract machine branch Node

 class MachBranchNode : public MachIdealNode {

 public:

   MachBranchNode() : MachIdealNode() {

     init_class_id(Class_MachBranch);

   }

   virtual void label_set(Label* label, uint block_num) = 0;

   virtual void save_label(Label** label, uint* block_num) = 0;

   // Support for short branches

   virtual MachNode *short_branch_version(Compile* C) { return NULL; }

   virtual bool pinned() const { return true; };

 };

 //------------------------------MachNullChkNode--------------------------------

 // Machine-dependent null-pointer-check Node.  Points a real MachNode that is

 // also some kind of memory op.  Turns the indicated MachNode into a

 // conditional branch with good latency on the ptr-not-null path and awful

 // latency on the pointer-is-null path.

 class MachNullCheckNode : public MachBranchNode {

 public:

   const uint _vidx;             // Index of memop being tested

   MachNullCheckNode( Node *ctrl, Node *memop, uint vidx ) : MachBranchNode(), _vidx(vidx) {

     init_class_id(Class_MachNullCheck);

     add_req(ctrl);

     add_req(memop);

   }

   virtual uint size_of() const { return sizeof(*this); }

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;

   virtual void label_set(Label* label, uint block_num);

   virtual void save_label(Label** label, uint* block_num);

   virtual void negate() { }

   virtual const class Type *bottom_type() const { return TypeTuple::IFBOTH; }

   virtual uint ideal_reg() const { return NotAMachineReg; }

   virtual const RegMask &in_RegMask(uint) const;

   virtual const RegMask &out_RegMask() const { return RegMask::Empty; }

 #ifndef PRODUCT

   virtual const char *Name() const { return "NullCheck"; }

   virtual void format( PhaseRegAlloc *, outputStream *st ) const;

 #endif

 };

 //------------------------------MachProjNode----------------------------------

 // Machine-dependent Ideal projections (how is that for an oxymoron).  Really

 // just MachNodes made by the Ideal world that replicate simple projections

 // but with machine-dependent input & output register masks.  Generally

 // produced as part of calling conventions.  Normally I make MachNodes as part

 // of the Matcher process, but the Matcher is ill suited to issues involving

 // frame handling, so frame handling is all done in the Ideal world with

 // occasional callbacks to the machine model for important info.

 class MachProjNode : public ProjNode {

 public:

   MachProjNode( Node *multi, uint con, const RegMask &out, uint ideal_reg ) : ProjNode(multi,con), _rout(out), _ideal_reg(ideal_reg) {

     init_class_id(Class_MachProj);

   }

   RegMask _rout;

   const uint  _ideal_reg;

   enum projType {

     unmatched_proj = 0,         // Projs for Control, I/O, memory not matched

     fat_proj       = 999        // Projs killing many regs, defined by _rout

   };

   virtual int   Opcode() const;

   virtual const Type *bottom_type() const;

   virtual const TypePtr *adr_type() const;

   virtual const RegMask &in_RegMask(uint) const { return RegMask::Empty; }

   virtual const RegMask &out_RegMask() const { return _rout; }

   virtual uint  ideal_reg() const { return _ideal_reg; }

   // Need size_of() for virtual ProjNode::clone()

   virtual uint  size_of() const { return sizeof(MachProjNode); }

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachIfNode-------------------------------------

 // Machine-specific versions of IfNodes

 class MachIfNode : public MachBranchNode {

   virtual uint size_of() const { return sizeof(*this); } // Size is bigger

 public:

   float _prob;                  // Probability branch goes either way

   float _fcnt;                  // Frequency counter

   MachIfNode() : MachBranchNode() {

     init_class_id(Class_MachIf);

   }

   // Negate conditional branches.

   virtual void negate() = 0;

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachGotoNode-----------------------------------

 // Machine-specific versions of GotoNodes

 class MachGotoNode : public MachBranchNode {

 public:

   MachGotoNode() : MachBranchNode() {

     init_class_id(Class_MachGoto);

   }

 };

 //------------------------------MachFastLockNode-------------------------------------

 // Machine-specific versions of FastLockNodes

 class MachFastLockNode : public MachNode {

   virtual uint size_of() const { return sizeof(*this); } // Size is bigger

 public:

   BiasedLockingCounters* _counters;

   MachFastLockNode() : MachNode() {}

 };

 //------------------------------MachReturnNode--------------------------------

 // Machine-specific versions of subroutine returns

 class MachReturnNode : public MachNode {

   virtual uint size_of() const; // Size is bigger

 public:

   RegMask *_in_rms;             // Input register masks, set during allocation

   ReallocMark _nesting;         // assertion check for reallocations

   const TypePtr* _adr_type;     // memory effects of call or return

   MachReturnNode() : MachNode() {

     init_class_id(Class_MachReturn);

     _adr_type = TypePtr::BOTTOM; // the default: all of memory

   }

   void set_adr_type(const TypePtr* atp) { _adr_type = atp; }

   virtual const RegMask &in_RegMask(uint) const;

   virtual bool pinned() const { return true; };

   virtual const TypePtr *adr_type() const;

 };

 //------------------------------MachSafePointNode-----------------------------

 // Machine-specific versions of safepoints

 class MachSafePointNode : public MachReturnNode {

 public:

   OopMap*         _oop_map;     // Array of OopMap info (8-bit char) for GC

   JVMState*       _jvms;        // Pointer to list of JVM State Objects

   uint            _jvmadj;      // Extra delta to jvms indexes (mach. args)

   OopMap*         oop_map() const { return _oop_map; }

   void            set_oop_map(OopMap* om) { _oop_map = om; }

   MachSafePointNode() : MachReturnNode(), _oop_map(NULL), _jvms(NULL), _jvmadj(0) {

     init_class_id(Class_MachSafePoint);

   }

   virtual JVMState* jvms() const { return _jvms; }

   void set_jvms(JVMState* s) {

     _jvms = s;

   }

   virtual const Type    *bottom_type() const;

   virtual const RegMask &in_RegMask(uint) const;

   // Functionality from old debug nodes

   Node *returnadr() const { return in(TypeFunc::ReturnAdr); }

   Node *frameptr () const { return in(TypeFunc::FramePtr); }

   Node *local(const JVMState* jvms, uint idx) const {

     assert(verify_jvms(jvms), "jvms must match");

     return in(_jvmadj + jvms->locoff() + idx);

   }

   Node *stack(const JVMState* jvms, uint idx) const {

     assert(verify_jvms(jvms), "jvms must match");

     return in(_jvmadj + jvms->stkoff() + idx);

  }

   Node *monitor_obj(const JVMState* jvms, uint idx) const {

     assert(verify_jvms(jvms), "jvms must match");

     return in(_jvmadj + jvms->monitor_obj_offset(idx));

   }

   Node *monitor_box(const JVMState* jvms, uint idx) const {

     assert(verify_jvms(jvms), "jvms must match");

     return in(_jvmadj + jvms->monitor_box_offset(idx));

   }

   void  set_local(const JVMState* jvms, uint idx, Node *c) {

     assert(verify_jvms(jvms), "jvms must match");

     set_req(_jvmadj + jvms->locoff() + idx, c);

   }

   void  set_stack(const JVMState* jvms, uint idx, Node *c) {

     assert(verify_jvms(jvms), "jvms must match");

     set_req(_jvmadj + jvms->stkoff() + idx, c);

   }

   void  set_monitor(const JVMState* jvms, uint idx, Node *c) {

     assert(verify_jvms(jvms), "jvms must match");

     set_req(_jvmadj + jvms->monoff() + idx, c);

   }

 };

 //------------------------------MachCallNode----------------------------------

 // Machine-specific versions of subroutine calls

 class MachCallNode : public MachSafePointNode {

 protected:

   virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash

   virtual uint cmp( const Node &n ) const;

   virtual uint size_of() const = 0; // Size is bigger

 public:

   const TypeFunc *_tf;        // Function type

   address      _entry_point;  // Address of the method being called

   float        _cnt;          // Estimate of number of times called

   uint         _argsize;      // Size of argument block on stack

   const TypeFunc* tf()        const { return _tf; }

   const address entry_point() const { return _entry_point; }

   const float   cnt()         const { return _cnt; }

   uint argsize()              const { return _argsize; }

   void set_tf(const TypeFunc* tf) { _tf = tf; }

   void set_entry_point(address p) { _entry_point = p; }

   void set_cnt(float c)           { _cnt = c; }

   void set_argsize(int s)         { _argsize = s; }

   MachCallNode() : MachSafePointNode() {

     init_class_id(Class_MachCall);

   }

   virtual const Type *bottom_type() const;

   virtual bool  pinned() const { return false; }

   virtual const Type *Value( PhaseTransform *phase ) const;

   virtual const RegMask &in_RegMask(uint) const;

   virtual int ret_addr_offset() { return 0; }

   bool returns_long() const { return tf()->return_type() == T_LONG; }

   bool return_value_is_used() const;

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachCallJavaNode------------------------------

 // "Base" class for machine-specific versions of subroutine calls

 class MachCallJavaNode : public MachCallNode {

 protected:

   virtual uint cmp( const Node &n ) const;

   virtual uint size_of() const; // Size is bigger

 public:

   ciMethod* _method;             // Method being direct called

   int        _bci;               // Byte Code index of call byte code

   bool       _optimized_virtual; // Tells if node is a static call or an optimized virtual

   bool       _method_handle_invoke;   // Tells if the call has to preserve SP

   MachCallJavaNode() : MachCallNode() {

     init_class_id(Class_MachCallJava);

   }

   virtual const RegMask &in_RegMask(uint) const;

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachCallStaticJavaNode------------------------

 // Machine-specific versions of monomorphic subroutine calls

 class MachCallStaticJavaNode : public MachCallJavaNode {

   virtual uint cmp( const Node &n ) const;

   virtual uint size_of() const; // Size is bigger

 public:

   const char *_name;            // Runtime wrapper name

   MachCallStaticJavaNode() : MachCallJavaNode() {

     init_class_id(Class_MachCallStaticJava);

   }

   // If this is an uncommon trap, return the request code, else zero.

   int uncommon_trap_request() const;

   virtual int ret_addr_offset();

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

   void dump_trap_args(outputStream *st) const;

 #endif

 };

 //------------------------------MachCallDynamicJavaNode------------------------

 // Machine-specific versions of possibly megamorphic subroutine calls

 class MachCallDynamicJavaNode : public MachCallJavaNode {

 public:

   int _vtable_index;

   MachCallDynamicJavaNode() : MachCallJavaNode() {

     init_class_id(Class_MachCallDynamicJava);

     DEBUG_ONLY(_vtable_index = -99);  // throw an assert if uninitialized

   }

   virtual int ret_addr_offset();

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------MachCallRuntimeNode----------------------------

 // Machine-specific versions of subroutine calls

 class MachCallRuntimeNode : public MachCallNode {

   virtual uint cmp( const Node &n ) const;

   virtual uint size_of() const; // Size is bigger

 public:

   const char *_name;            // Printable name, if _method is NULL

   MachCallRuntimeNode() : MachCallNode() {

     init_class_id(Class_MachCallRuntime);

   }

   virtual int ret_addr_offset();

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 class MachCallLeafNode: public MachCallRuntimeNode {

 public:

   MachCallLeafNode() : MachCallRuntimeNode() {

     init_class_id(Class_MachCallLeaf);

   }

 };

 //------------------------------MachHaltNode-----------------------------------

 // Machine-specific versions of halt nodes

 class MachHaltNode : public MachReturnNode {

 public:

   virtual JVMState* jvms() const;

 };

 //------------------------------MachTempNode-----------------------------------

 // Node used by the adlc to construct inputs to represent temporary registers

 class MachTempNode : public MachNode {

 private:

   MachOper *_opnd_array[1];

 public:

   virtual const RegMask &out_RegMask() const { return *_opnds[0]->in_RegMask(0); }

   virtual uint rule() const { return 9999999; }

   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {}

   MachTempNode(MachOper* oper) {

     init_class_id(Class_MachTemp);

     _num_opnds = 1;

     _opnds = _opnd_array;

     add_req(NULL);

     _opnds[0] = oper;

   }

   virtual uint size_of() const { return sizeof(MachTempNode); }

 #ifndef PRODUCT

   virtual void format(PhaseRegAlloc *, outputStream *st ) const {}

   virtual const char *Name() const { return "MachTemp";}

 #endif

 };

 //------------------------------labelOper--------------------------------------

 // Machine-independent version of label operand

 class labelOper : public MachOper {

 private:

   virtual uint           num_edges() const { return 0; }

 public:

   // Supported for fixed size branches

   Label* _label;                // Label for branch(es)

   uint _block_num;

   labelOper() : _block_num(0), _label(0) {}

   labelOper(Label* label, uint block_num) : _label(label), _block_num(block_num) {}

   labelOper(labelOper* l) : _label(l->_label) , _block_num(l->_block_num) {}

   virtual MachOper *clone(Compile* C) const;

   virtual Label *label() const { assert(_label != NULL, "need Label"); return _label; }

   virtual uint           opcode() const;

   virtual uint           hash()   const;

   virtual uint           cmp( const MachOper &oper ) const;

 #ifndef PRODUCT

   virtual const char    *Name()   const { return "Label";}

   virtual void int_format(PhaseRegAlloc *ra, const MachNode *node, outputStream *st) const;

   virtual void ext_format(PhaseRegAlloc *ra, const MachNode *node, int idx, outputStream *st) const { int_format( ra, node, st ); }

 #endif

 };

 //------------------------------methodOper--------------------------------------

 // Machine-independent version of method operand

 class methodOper : public MachOper {

 private:

   virtual uint           num_edges() const { return 0; }

 public:

   intptr_t _method;             // Address of method

   methodOper() :   _method(0) {}

   methodOper(intptr_t method) : _method(method)  {}

   virtual MachOper *clone(Compile* C) const;

   virtual intptr_t method() const { return _method; }

   virtual uint           opcode() const;

   virtual uint           hash()   const;

   virtual uint           cmp( const MachOper &oper ) const;

 #ifndef PRODUCT

   virtual const char    *Name()   const { return "Method";}

   virtual void int_format(PhaseRegAlloc *ra, const MachNode *node, outputStream *st) const;

   virtual void ext_format(PhaseRegAlloc *ra, const MachNode *node, int idx, outputStream *st) const { int_format( ra, node, st ); }

 #endif

 };

 #endif // SHARE_VM_OPTO_MACHNODE_HPP