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 /*

  * Copyright (c) 1997, 2015, 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

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 #ifndef SHARE_VM_OPTO_CALLNODE_HPP

 #define SHARE_VM_OPTO_CALLNODE_HPP

 #include "opto/connode.hpp"

 #include "opto/mulnode.hpp"

 #include "opto/multnode.hpp"

 #include "opto/opcodes.hpp"

 #include "opto/phaseX.hpp"

 #include "opto/replacednodes.hpp"

 #include "opto/type.hpp"

 // Portions of code courtesy of Clifford Click

 // Optimization - Graph Style

 class Chaitin;

 class NamedCounter;

 class MultiNode;

 class  SafePointNode;

 class   CallNode;

 class     CallJavaNode;

 class       CallStaticJavaNode;

 class       CallDynamicJavaNode;

 class     CallRuntimeNode;

 class       CallLeafNode;

 class         CallLeafNoFPNode;

 class     AllocateNode;

 class       AllocateArrayNode;

 class     BoxLockNode;

 class     LockNode;

 class     UnlockNode;

 class JVMState;

 class OopMap;

 class State;

 class StartNode;

 class MachCallNode;

 class FastLockNode;

 //------------------------------StartNode--------------------------------------

 // The method start node

 class StartNode : public MultiNode {

   virtual uint cmp( const Node &n ) const;

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

 public:

   const TypeTuple *_domain;

   StartNode( Node *root, const TypeTuple *domain ) : MultiNode(2), _domain(domain) {

     init_class_id(Class_Start);

     init_req(0,this);

     init_req(1,root);

   }

   virtual int Opcode() const;

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

   virtual const Type *bottom_type() const;

   virtual const TypePtr *adr_type() const { return TypePtr::BOTTOM; }

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

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   virtual void  calling_convention( BasicType* sig_bt, VMRegPair *parm_reg, uint length ) const;

   virtual const RegMask &in_RegMask(uint) const;

   virtual Node *match( const ProjNode *proj, const Matcher *m );

   virtual uint ideal_reg() const { return 0; }

 #ifndef PRODUCT

   virtual void  dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------StartOSRNode-----------------------------------

 // The method start node for on stack replacement code

 class StartOSRNode : public StartNode {

 public:

   StartOSRNode( Node *root, const TypeTuple *domain ) : StartNode(root, domain) {}

   virtual int   Opcode() const;

   static  const TypeTuple *osr_domain();

 };

 //------------------------------ParmNode---------------------------------------

 // Incoming parameters

 class ParmNode : public ProjNode {

   static const char * const names[TypeFunc::Parms+1];

 public:

   ParmNode( StartNode *src, uint con ) : ProjNode(src,con) {

     init_class_id(Class_Parm);

   }

   virtual int Opcode() const;

   virtual bool  is_CFG() const { return (_con == TypeFunc::Control); }

   virtual uint ideal_reg() const;

 #ifndef PRODUCT

   virtual void dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------ReturnNode-------------------------------------

 // Return from subroutine node

 class ReturnNode : public Node {

 public:

   ReturnNode( uint edges, Node *cntrl, Node *i_o, Node *memory, Node *retadr, Node *frameptr );

   virtual int Opcode() const;

   virtual bool  is_CFG() const { return true; }

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

   virtual bool depends_only_on_test() const { return false; }

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

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

   virtual uint ideal_reg() const { return NotAMachineReg; }

   virtual uint match_edge(uint idx) const;

 #ifndef PRODUCT

   virtual void dump_req(outputStream *st = tty) const;

 #endif

 };

 //------------------------------RethrowNode------------------------------------

 // Rethrow of exception at call site.  Ends a procedure before rethrowing;

 // ends the current basic block like a ReturnNode.  Restores registers and

 // unwinds stack.  Rethrow happens in the caller's method.

 class RethrowNode : public Node {

  public:

   RethrowNode( Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *ret_adr, Node *exception );

   virtual int Opcode() const;

   virtual bool  is_CFG() const { return true; }

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

   virtual bool depends_only_on_test() const { return false; }

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

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

   virtual uint match_edge(uint idx) const;

   virtual uint ideal_reg() const { return NotAMachineReg; }

 #ifndef PRODUCT

   virtual void dump_req(outputStream *st = tty) const;

 #endif

 };

 //------------------------------TailCallNode-----------------------------------

 // Pop stack frame and jump indirect

 class TailCallNode : public ReturnNode {

 public:

   TailCallNode( Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr, Node *target, Node *moop )

     : ReturnNode( TypeFunc::Parms+2, cntrl, i_o, memory, frameptr, retadr ) {

     init_req(TypeFunc::Parms, target);

     init_req(TypeFunc::Parms+1, moop);

   }

   virtual int Opcode() const;

   virtual uint match_edge(uint idx) const;

 };

 //------------------------------TailJumpNode-----------------------------------

 // Pop stack frame and jump indirect

 class TailJumpNode : public ReturnNode {

 public:

   TailJumpNode( Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *target, Node *ex_oop)

     : ReturnNode(TypeFunc::Parms+2, cntrl, i_o, memory, frameptr, Compile::current()->top()) {

     init_req(TypeFunc::Parms, target);

     init_req(TypeFunc::Parms+1, ex_oop);

   }

   virtual int Opcode() const;

   virtual uint match_edge(uint idx) const;

 };

 //-------------------------------JVMState-------------------------------------

 // A linked list of JVMState nodes captures the whole interpreter state,

 // plus GC roots, for all active calls at some call site in this compilation

 // unit.  (If there is no inlining, then the list has exactly one link.)

 // This provides a way to map the optimized program back into the interpreter,

 // or to let the GC mark the stack.

 class JVMState : public ResourceObj {

   friend class VMStructs;

 public:

   typedef enum {

     Reexecute_Undefined = -1, // not defined -- will be translated into false later

     Reexecute_False     =  0, // false       -- do not reexecute

     Reexecute_True      =  1  // true        -- reexecute the bytecode

   } ReexecuteState; //Reexecute State

 private:

   JVMState*         _caller;    // List pointer for forming scope chains

   uint              _depth;     // One more than caller depth, or one.

   uint              _locoff;    // Offset to locals in input edge mapping

   uint              _stkoff;    // Offset to stack in input edge mapping

   uint              _monoff;    // Offset to monitors in input edge mapping

   uint              _scloff;    // Offset to fields of scalar objs in input edge mapping

   uint              _endoff;    // Offset to end of input edge mapping

   uint              _sp;        // Jave Expression Stack Pointer for this state

   int               _bci;       // Byte Code Index of this JVM point

   ReexecuteState    _reexecute; // Whether this bytecode need to be re-executed

   ciMethod*         _method;    // Method Pointer

   SafePointNode*    _map;       // Map node associated with this scope

 public:

   friend class Compile;

   friend class PreserveReexecuteState;

   // Because JVMState objects live over the entire lifetime of the

   // Compile object, they are allocated into the comp_arena, which

   // does not get resource marked or reset during the compile process

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

   void operator delete( void * ) { } // fast deallocation

   // Create a new JVMState, ready for abstract interpretation.

   JVMState(ciMethod* method, JVMState* caller);

   JVMState(int stack_size);  // root state; has a null method

   // Access functions for the JVM

   // ... --|--- loc ---|--- stk ---|--- arg ---|--- mon ---|--- scl ---|

   //       \ locoff    \ stkoff    \ argoff    \ monoff    \ scloff    \ endoff

   uint              locoff() const { return _locoff; }

   uint              stkoff() const { return _stkoff; }

   uint              argoff() const { return _stkoff + _sp; }

   uint              monoff() const { return _monoff; }

   uint              scloff() const { return _scloff; }

   uint              endoff() const { return _endoff; }

   uint              oopoff() const { return debug_end(); }

   int            loc_size() const { return stkoff() - locoff(); }

   int            stk_size() const { return monoff() - stkoff(); }

   int            mon_size() const { return scloff() - monoff(); }

   int            scl_size() const { return endoff() - scloff(); }

   bool        is_loc(uint i) const { return locoff() <= i && i < stkoff(); }

   bool        is_stk(uint i) const { return stkoff() <= i && i < monoff(); }

   bool        is_mon(uint i) const { return monoff() <= i && i < scloff(); }

   bool        is_scl(uint i) const { return scloff() <= i && i < endoff(); }

   uint                      sp() const { return _sp; }

   int                      bci() const { return _bci; }

   bool        should_reexecute() const { return _reexecute==Reexecute_True; }

   bool  is_reexecute_undefined() const { return _reexecute==Reexecute_Undefined; }

   bool              has_method() const { return _method != NULL; }

   ciMethod*             method() const { assert(has_method(), ""); return _method; }

   JVMState*             caller() const { return _caller; }

   SafePointNode*           map() const { return _map; }

   uint                   depth() const { return _depth; }

   uint             debug_start() const; // returns locoff of root caller

   uint               debug_end() const; // returns endoff of self

   uint              debug_size() const {

     return loc_size() + sp() + mon_size() + scl_size();

   }

   uint        debug_depth()  const; // returns sum of debug_size values at all depths

   // Returns the JVM state at the desired depth (1 == root).

   JVMState* of_depth(int d) const;

   // Tells if two JVM states have the same call chain (depth, methods, & bcis).

   bool same_calls_as(const JVMState* that) const;

   // Monitors (monitors are stored as (boxNode, objNode) pairs

   enum { logMonitorEdges = 1 };

   int  nof_monitors()              const { return mon_size() >> logMonitorEdges; }

   int  monitor_depth()             const { return nof_monitors() + (caller() ? caller()->monitor_depth() : 0); }

   int  monitor_box_offset(int idx) const { return monoff() + (idx << logMonitorEdges) + 0; }

   int  monitor_obj_offset(int idx) const { return monoff() + (idx << logMonitorEdges) + 1; }

   bool is_monitor_box(uint off)    const {

     assert(is_mon(off), "should be called only for monitor edge");

     return (0 == bitfield(off - monoff(), 0, logMonitorEdges));

   }

   bool is_monitor_use(uint off)    const { return (is_mon(off)

                                                    && is_monitor_box(off))

                                              || (caller() && caller()->is_monitor_use(off)); }

   // Initialization functions for the JVM

   void              set_locoff(uint off) { _locoff = off; }

   void              set_stkoff(uint off) { _stkoff = off; }

   void              set_monoff(uint off) { _monoff = off; }

   void              set_scloff(uint off) { _scloff = off; }

   void              set_endoff(uint off) { _endoff = off; }

   void              set_offsets(uint off) {

     _locoff = _stkoff = _monoff = _scloff = _endoff = off;

   }

   void              set_map(SafePointNode *map) { _map = map; }

   void              set_sp(uint sp) { _sp = sp; }

                     // _reexecute is initialized to "undefined" for a new bci

   void              set_bci(int bci) {if(_bci != bci)_reexecute=Reexecute_Undefined; _bci = bci; }

   void              set_should_reexecute(bool reexec) {_reexecute = reexec ? Reexecute_True : Reexecute_False;}

   // Miscellaneous utility functions

   JVMState* clone_deep(Compile* C) const;    // recursively clones caller chain

   JVMState* clone_shallow(Compile* C) const; // retains uncloned caller

   void      set_map_deep(SafePointNode *map);// reset map for all callers

   void      adapt_position(int delta);       // Adapt offsets in in-array after adding an edge.

   int       interpreter_frame_size() const;

 #ifndef PRODUCT

   void      format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const;

   void      dump_spec(outputStream *st) const;

   void      dump_on(outputStream* st) const;

   void      dump() const {

     dump_on(tty);

   }

 #endif

 };

 //------------------------------SafePointNode----------------------------------

 // A SafePointNode is a subclass of a MultiNode for convenience (and

 // potential code sharing) only - conceptually it is independent of

 // the Node semantics.

 class SafePointNode : public MultiNode {

   virtual uint           cmp( const Node &n ) const;

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

 public:

   SafePointNode(uint edges, JVMState* jvms,

                 // A plain safepoint advertises no memory effects (NULL):

                 const TypePtr* adr_type = NULL)

     : MultiNode( edges ),

       _jvms(jvms),

       _oop_map(NULL),

       _adr_type(adr_type)

   {

     init_class_id(Class_SafePoint);

   }

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

   JVMState* const _jvms;      // Pointer to list of JVM State objects

   const TypePtr*  _adr_type;  // What type of memory does this node produce?

   ReplacedNodes   _replaced_nodes; // During parsing: list of pair of nodes from calls to GraphKit::replace_in_map()

   // Many calls take *all* of memory as input,

   // but some produce a limited subset of that memory as output.

   // The adr_type reports the call's behavior as a store, not a load.

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

   void set_jvms(JVMState* s) {

     *(JVMState**)&_jvms = s;  // override const attribute in the accessor

   }

   OopMap *oop_map() const { return _oop_map; }

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

  private:

   void verify_input(JVMState* jvms, uint idx) const {

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

     Node* n = in(idx);

     assert((!n->bottom_type()->isa_long() && !n->bottom_type()->isa_double()) ||

            in(idx + 1)->is_top(), "2nd half of long/double");

   }

  public:

   // Functionality from old debug nodes which has changed

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

     verify_input(jvms, jvms->locoff() + idx);

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

   }

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

     verify_input(jvms, jvms->stkoff() + idx);

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

   }

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

     verify_input(jvms, jvms->argoff() + idx);

     return in(jvms->argoff() + idx);

   }

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

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

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

   }

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

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

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

   }

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

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

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

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

   }

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

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

     set_req(jvms->argoff() + idx, c);

   }

   void ensure_stack(JVMState* jvms, uint stk_size) {

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

     int grow_by = (int)stk_size - (int)jvms->stk_size();

     if (grow_by > 0)  grow_stack(jvms, grow_by);

   }

   void grow_stack(JVMState* jvms, uint grow_by);

   // Handle monitor stack

   void push_monitor( const FastLockNode *lock );

   void pop_monitor ();

   Node *peek_monitor_box() const;

   Node *peek_monitor_obj() const;

   // Access functions for the JVM

   Node *control  () const { return in(TypeFunc::Control  ); }

   Node *i_o      () const { return in(TypeFunc::I_O      ); }

   Node *memory   () const { return in(TypeFunc::Memory   ); }

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

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

   void set_control  ( Node *c ) { set_req(TypeFunc::Control,c); }

   void set_i_o      ( Node *c ) { set_req(TypeFunc::I_O    ,c); }

   void set_memory   ( Node *c ) { set_req(TypeFunc::Memory ,c); }

   MergeMemNode* merged_memory() const {

     return in(TypeFunc::Memory)->as_MergeMem();

   }

   // The parser marks useless maps as dead when it's done with them:

   bool is_killed() { return in(TypeFunc::Control) == NULL; }

   // Exception states bubbling out of subgraphs such as inlined calls

   // are recorded here.  (There might be more than one, hence the "next".)

   // This feature is used only for safepoints which serve as "maps"

   // for JVM states during parsing, intrinsic expansion, etc.

   SafePointNode*         next_exception() const;

   void               set_next_exception(SafePointNode* n);

   bool                   has_exceptions() const { return next_exception() != NULL; }

   // Helper methods to operate on replaced nodes

   ReplacedNodes replaced_nodes() const {

     return _replaced_nodes;

   }

   void set_replaced_nodes(ReplacedNodes replaced_nodes) {

     _replaced_nodes = replaced_nodes;

   }

   void clone_replaced_nodes() {

     _replaced_nodes.clone();

   }

   void record_replaced_node(Node* initial, Node* improved) {

     _replaced_nodes.record(initial, improved);

   }

   void transfer_replaced_nodes_from(SafePointNode* sfpt, uint idx = 0) {

     _replaced_nodes.transfer_from(sfpt->_replaced_nodes, idx);

   }

   void delete_replaced_nodes() {

     _replaced_nodes.reset();

   }

   void apply_replaced_nodes(uint idx) {

     _replaced_nodes.apply(this, idx);

   }

   void merge_replaced_nodes_with(SafePointNode* sfpt) {

     _replaced_nodes.merge_with(sfpt->_replaced_nodes);

   }

   bool has_replaced_nodes() const {

     return !_replaced_nodes.is_empty();

   }

   void disconnect_from_root(PhaseIterGVN *igvn);

   // Standard Node stuff

   virtual int            Opcode() const;

   virtual bool           pinned() const { return true; }

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

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

   virtual const TypePtr *adr_type() const { return _adr_type; }

   virtual Node          *Ideal(PhaseGVN *phase, bool can_reshape);

   virtual Node          *Identity( PhaseTransform *phase );

   virtual uint           ideal_reg() const { return 0; }

   virtual const RegMask &in_RegMask(uint) const;

   virtual const RegMask &out_RegMask() const;

   virtual uint           match_edge(uint idx) const;

   static  bool           needs_polling_address_input();

 #ifndef PRODUCT

   virtual void           dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------SafePointScalarObjectNode----------------------

 // A SafePointScalarObjectNode represents the state of a scalarized object

 // at a safepoint.

 class SafePointScalarObjectNode: public TypeNode {

   uint _first_index; // First input edge relative index of a SafePoint node where

                      // states of the scalarized object fields are collected.

                      // It is relative to the last (youngest) jvms->_scloff.

   uint _n_fields;    // Number of non-static fields of the scalarized object.

   DEBUG_ONLY(AllocateNode* _alloc;)

   virtual uint hash() const ; // { return NO_HASH; }

   virtual uint cmp( const Node &n ) const;

   uint first_index() const { return _first_index; }

 public:

   SafePointScalarObjectNode(const TypeOopPtr* tp,

 #ifdef ASSERT

                             AllocateNode* alloc,

 #endif

                             uint first_index, uint n_fields);

   virtual int Opcode() const;

   virtual uint           ideal_reg() const;

   virtual const RegMask &in_RegMask(uint) const;

   virtual const RegMask &out_RegMask() const;

   virtual uint           match_edge(uint idx) const;

   uint first_index(JVMState* jvms) const {

     assert(jvms != NULL, "missed JVMS");

     return jvms->scloff() + _first_index;

   }

   uint n_fields()    const { return _n_fields; }

 #ifdef ASSERT

   AllocateNode* alloc() const { return _alloc; }

 #endif

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

   // Assumes that "this" is an argument to a safepoint node "s", and that

   // "new_call" is being created to correspond to "s".  But the difference

   // between the start index of the jvmstates of "new_call" and "s" is

   // "jvms_adj".  Produce and return a SafePointScalarObjectNode that

   // corresponds appropriately to "this" in "new_call".  Assumes that

   // "sosn_map" is a map, specific to the translation of "s" to "new_call",

   // mapping old SafePointScalarObjectNodes to new, to avoid multiple copies.

   SafePointScalarObjectNode* clone(Dict* sosn_map) const;

 #ifndef PRODUCT

   virtual void              dump_spec(outputStream *st) const;

 #endif

 };

 // Simple container for the outgoing projections of a call.  Useful

 // for serious surgery on calls.

 class CallProjections : public StackObj {

 public:

   Node* fallthrough_proj;

   Node* fallthrough_catchproj;

   Node* fallthrough_memproj;

   Node* fallthrough_ioproj;

   Node* catchall_catchproj;

   Node* catchall_memproj;

   Node* catchall_ioproj;

   Node* resproj;

   Node* exobj;

 };

 class CallGenerator;

 //------------------------------CallNode---------------------------------------

 // Call nodes now subsume the function of debug nodes at callsites, so they

 // contain the functionality of a full scope chain of debug nodes.

 class CallNode : public SafePointNode {

   friend class VMStructs;

 public:

   const TypeFunc *_tf;        // Function type

   address      _entry_point;  // Address of method being called

   float        _cnt;          // Estimate of number of times called

   CallGenerator* _generator;  // corresponding CallGenerator for some late inline calls

   CallNode(const TypeFunc* tf, address addr, const TypePtr* adr_type)

     : SafePointNode(tf->domain()->cnt(), NULL, adr_type),

       _tf(tf),

       _entry_point(addr),

       _cnt(COUNT_UNKNOWN),

       _generator(NULL)

   {

     init_class_id(Class_Call);

   }

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

   const address  entry_point() const { return _entry_point; }

   const float    cnt()         const { return _cnt; }

   CallGenerator* generator()   const { return _generator; }

   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_generator(CallGenerator* cg) { _generator = cg; }

   virtual const Type *bottom_type() const;

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

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   virtual Node *Identity( PhaseTransform *phase ) { return this; }

   virtual uint        cmp( const Node &n ) const;

   virtual uint        size_of() const = 0;

   virtual void        calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const;

   virtual Node       *match( const ProjNode *proj, const Matcher *m );

   virtual uint        ideal_reg() const { return NotAMachineReg; }

   // Are we guaranteed that this node is a safepoint?  Not true for leaf calls and

   // for some macro nodes whose expansion does not have a safepoint on the fast path.

   virtual bool        guaranteed_safepoint()  { return true; }

   // For macro nodes, the JVMState gets modified during expansion. If calls

   // use MachConstantBase, it gets modified during matching. So when cloning

   // the node the JVMState must be cloned. Default is not to clone.

   virtual void clone_jvms(Compile* C) {

     if (C->needs_clone_jvms() && jvms() != NULL) {

       set_jvms(jvms()->clone_deep(C));

       jvms()->set_map_deep(this);

     }

   }

   // Returns true if the call may modify n

   virtual bool        may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase);

   // Does this node have a use of n other than in debug information?

   bool                has_non_debug_use(Node *n);

   // Returns the unique CheckCastPP of a call

   // or result projection is there are several CheckCastPP

   // or returns NULL if there is no one.

   Node *result_cast();

   // Does this node returns pointer?

   bool returns_pointer() const {

     const TypeTuple *r = tf()->range();

     return (r->cnt() > TypeFunc::Parms &&

             r->field_at(TypeFunc::Parms)->isa_ptr());

   }

   // Collect all the interesting edges from a call for use in

   // replacing the call by something else.  Used by macro expansion

   // and the late inlining support.

   void extract_projections(CallProjections* projs, bool separate_io_proj);

   virtual uint match_edge(uint idx) const;

 #ifndef PRODUCT

   virtual void        dump_req(outputStream *st = tty) const;

   virtual void        dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallJavaNode-----------------------------------

 // Make a static or dynamic subroutine call node using Java calling

 // convention.  (The "Java" calling convention is the compiler's calling

 // convention, as opposed to the interpreter's or that of native C.)

 class CallJavaNode : public CallNode {

   friend class VMStructs;

 protected:

   virtual uint cmp( const Node &n ) const;

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

   bool    _optimized_virtual;

   bool    _method_handle_invoke;

   ciMethod* _method;            // Method being direct called

 public:

   const int       _bci;         // Byte Code Index of call byte code

   CallJavaNode(const TypeFunc* tf , address addr, ciMethod* method, int bci)

     : CallNode(tf, addr, TypePtr::BOTTOM),

       _method(method), _bci(bci),

       _optimized_virtual(false),

       _method_handle_invoke(false)

   {

     init_class_id(Class_CallJava);

   }

   virtual int   Opcode() const;

   ciMethod* method() const                { return _method; }

   void  set_method(ciMethod *m)           { _method = m; }

   void  set_optimized_virtual(bool f)     { _optimized_virtual = f; }

   bool  is_optimized_virtual() const      { return _optimized_virtual; }

   void  set_method_handle_invoke(bool f)  { _method_handle_invoke = f; }

   bool  is_method_handle_invoke() const   { return _method_handle_invoke; }

 #ifndef PRODUCT

   virtual void  dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallStaticJavaNode-----------------------------

 // Make a direct subroutine call using Java calling convention (for static

 // calls and optimized virtual calls, plus calls to wrappers for run-time

 // routines); generates static stub.

 class CallStaticJavaNode : public CallJavaNode {

   virtual uint cmp( const Node &n ) const;

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

 public:

   CallStaticJavaNode(Compile* C, const TypeFunc* tf, address addr, ciMethod* method, int bci)

     : CallJavaNode(tf, addr, method, bci), _name(NULL) {

     init_class_id(Class_CallStaticJava);

     if (C->eliminate_boxing() && (method != NULL) && method->is_boxing_method()) {

       init_flags(Flag_is_macro);

       C->add_macro_node(this);

     }

     _is_scalar_replaceable = false;

     _is_non_escaping = false;

   }

   CallStaticJavaNode(const TypeFunc* tf, address addr, const char* name, int bci,

                      const TypePtr* adr_type)

     : CallJavaNode(tf, addr, NULL, bci), _name(name) {

     init_class_id(Class_CallStaticJava);

     // This node calls a runtime stub, which often has narrow memory effects.

     _adr_type = adr_type;

     _is_scalar_replaceable = false;

     _is_non_escaping = false;

   }

   const char *_name;      // Runtime wrapper name

   // Result of Escape Analysis

   bool _is_scalar_replaceable;

   bool _is_non_escaping;

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

   int uncommon_trap_request() const;

   static int extract_uncommon_trap_request(const Node* call);

   bool is_boxing_method() const {

     return is_macro() && (method() != NULL) && method()->is_boxing_method();

   }

   // Later inlining modifies the JVMState, so we need to clone it

   // when the call node is cloned (because it is macro node).

   virtual void  clone_jvms(Compile* C) {

     if ((jvms() != NULL) && is_boxing_method()) {

       set_jvms(jvms()->clone_deep(C));

       jvms()->set_map_deep(this);

     }

   }

   virtual int         Opcode() const;

 #ifndef PRODUCT

   virtual void        dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallDynamicJavaNode----------------------------

 // Make a dispatched call using Java calling convention.

 class CallDynamicJavaNode : public CallJavaNode {

   virtual uint cmp( const Node &n ) const;

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

 public:

   CallDynamicJavaNode( const TypeFunc *tf , address addr, ciMethod* method, int vtable_index, int bci ) : CallJavaNode(tf,addr,method,bci), _vtable_index(vtable_index) {

     init_class_id(Class_CallDynamicJava);

   }

   int _vtable_index;

   virtual int   Opcode() const;

 #ifndef PRODUCT

   virtual void  dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallRuntimeNode--------------------------------

 // Make a direct subroutine call node into compiled C++ code.

 class CallRuntimeNode : public CallNode {

   virtual uint cmp( const Node &n ) const;

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

 public:

   CallRuntimeNode(const TypeFunc* tf, address addr, const char* name,

                   const TypePtr* adr_type)

     : CallNode(tf, addr, adr_type),

       _name(name)

   {

     init_class_id(Class_CallRuntime);

   }

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

   virtual int   Opcode() const;

   virtual void  calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const;

 #ifndef PRODUCT

   virtual void  dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallLeafNode-----------------------------------

 // Make a direct subroutine call node into compiled C++ code, without

 // safepoints

 class CallLeafNode : public CallRuntimeNode {

 public:

   CallLeafNode(const TypeFunc* tf, address addr, const char* name,

                const TypePtr* adr_type)

     : CallRuntimeNode(tf, addr, name, adr_type)

   {

     init_class_id(Class_CallLeaf);

   }

   virtual int   Opcode() const;

   virtual bool        guaranteed_safepoint()  { return false; }

 #ifndef PRODUCT

   virtual void  dump_spec(outputStream *st) const;

 #endif

 };

 //------------------------------CallLeafNoFPNode-------------------------------

 // CallLeafNode, not using floating point or using it in the same manner as

 // the generated code

 class CallLeafNoFPNode : public CallLeafNode {

 public:

   CallLeafNoFPNode(const TypeFunc* tf, address addr, const char* name,

                    const TypePtr* adr_type)

     : CallLeafNode(tf, addr, name, adr_type)

   {

   }

   virtual int   Opcode() const;

 };

 //------------------------------Allocate---------------------------------------

 // High-level memory allocation

 //

 //  AllocateNode and AllocateArrayNode are subclasses of CallNode because they will

 //  get expanded into a code sequence containing a call.  Unlike other CallNodes,

 //  they have 2 memory projections and 2 i_o projections (which are distinguished by

 //  the _is_io_use flag in the projection.)  This is needed when expanding the node in

 //  order to differentiate the uses of the projection on the normal control path from

 //  those on the exception return path.

 //

 class AllocateNode : public CallNode {

 public:

   enum {

     // Output:

     RawAddress  = TypeFunc::Parms,    // the newly-allocated raw address

     // Inputs:

     AllocSize   = TypeFunc::Parms,    // size (in bytes) of the new object

     KlassNode,                        // type (maybe dynamic) of the obj.

     InitialTest,                      // slow-path test (may be constant)

     ALength,                          // array length (or TOP if none)

     ParmLimit

   };

   static const TypeFunc* alloc_type(const Type* t) {

     const Type** fields = TypeTuple::fields(ParmLimit - TypeFunc::Parms);

     fields[AllocSize]   = TypeInt::POS;

     fields[KlassNode]   = TypeInstPtr::NOTNULL;

     fields[InitialTest] = TypeInt::BOOL;

     fields[ALength]     = t;  // length (can be a bad length)

     const TypeTuple *domain = TypeTuple::make(ParmLimit, fields);

     // create result type (range)

     fields = TypeTuple::fields(1);

     fields[TypeFunc::Parms+0] = TypeRawPtr::NOTNULL; // Returned oop

     const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+1, fields);

     return TypeFunc::make(domain, range);

   }

   // Result of Escape Analysis

   bool _is_scalar_replaceable;

   bool _is_non_escaping;

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

   AllocateNode(Compile* C, const TypeFunc *atype, Node *ctrl, Node *mem, Node *abio,

                Node *size, Node *klass_node, Node *initial_test);

   // Expansion modifies the JVMState, so we need to clone it

   virtual void  clone_jvms(Compile* C) {

     if (jvms() != NULL) {

       set_jvms(jvms()->clone_deep(C));

       jvms()->set_map_deep(this);

     }

   }

   virtual int Opcode() const;

   virtual uint ideal_reg() const { return Op_RegP; }

   virtual bool        guaranteed_safepoint()  { return false; }

   // allocations do not modify their arguments

   virtual bool        may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) { return false;}

   // Pattern-match a possible usage of AllocateNode.

   // Return null if no allocation is recognized.

   // The operand is the pointer produced by the (possible) allocation.

   // It must be a projection of the Allocate or its subsequent CastPP.

   // (Note:  This function is defined in file graphKit.cpp, near

   // GraphKit::new_instance/new_array, whose output it recognizes.)

   // The 'ptr' may not have an offset unless the 'offset' argument is given.

   static AllocateNode* Ideal_allocation(Node* ptr, PhaseTransform* phase);

   // Fancy version which uses AddPNode::Ideal_base_and_offset to strip

   // an offset, which is reported back to the caller.

   // (Note:  AllocateNode::Ideal_allocation is defined in graphKit.cpp.)

   static AllocateNode* Ideal_allocation(Node* ptr, PhaseTransform* phase,

                                         intptr_t& offset);

   // Dig the klass operand out of a (possible) allocation site.

   static Node* Ideal_klass(Node* ptr, PhaseTransform* phase) {

     AllocateNode* allo = Ideal_allocation(ptr, phase);

     return (allo == NULL) ? NULL : allo->in(KlassNode);

   }

   // Conservatively small estimate of offset of first non-header byte.

   int minimum_header_size() {

     return is_AllocateArray() ? arrayOopDesc::base_offset_in_bytes(T_BYTE) :

                                 instanceOopDesc::base_offset_in_bytes();

   }

   // Return the corresponding initialization barrier (or null if none).

   // Walks out edges to find it...

   // (Note: Both InitializeNode::allocation and AllocateNode::initialization

   // are defined in graphKit.cpp, which sets up the bidirectional relation.)

   InitializeNode* initialization();

   // Convenience for initialization->maybe_set_complete(phase)

   bool maybe_set_complete(PhaseGVN* phase);

 };

 //------------------------------AllocateArray---------------------------------

 //

 // High-level array allocation

 //

 class AllocateArrayNode : public AllocateNode {

 public:

   AllocateArrayNode(Compile* C, const TypeFunc *atype, Node *ctrl, Node *mem, Node *abio,

                     Node* size, Node* klass_node, Node* initial_test,

                     Node* count_val

                     )

     : AllocateNode(C, atype, ctrl, mem, abio, size, klass_node,

                    initial_test)

   {

     init_class_id(Class_AllocateArray);

     set_req(AllocateNode::ALength,        count_val);

   }

   virtual int Opcode() const;

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   // Dig the length operand out of a array allocation site.

   Node* Ideal_length() {

     return in(AllocateNode::ALength);

   }

   // Dig the length operand out of a array allocation site and narrow the

   // type with a CastII, if necesssary

   Node* make_ideal_length(const TypeOopPtr* ary_type, PhaseTransform *phase, bool can_create = true);

   // Pattern-match a possible usage of AllocateArrayNode.

   // Return null if no allocation is recognized.

   static AllocateArrayNode* Ideal_array_allocation(Node* ptr, PhaseTransform* phase) {

     AllocateNode* allo = Ideal_allocation(ptr, phase);

     return (allo == NULL || !allo->is_AllocateArray())

            ? NULL : allo->as_AllocateArray();

   }

 };

 //------------------------------AbstractLockNode-----------------------------------

 class AbstractLockNode: public CallNode {

 private:

   enum {

     Regular = 0,  // Normal lock

     NonEscObj,    // Lock is used for non escaping object

     Coarsened,    // Lock was coarsened

     Nested        // Nested lock

   } _kind;

 #ifndef PRODUCT

   NamedCounter* _counter;

 #endif

 protected:

   // helper functions for lock elimination

   //

   bool find_matching_unlock(const Node* ctrl, LockNode* lock,

                             GrowableArray<AbstractLockNode*> &lock_ops);

   bool find_lock_and_unlock_through_if(Node* node, LockNode* lock,

                                        GrowableArray<AbstractLockNode*> &lock_ops);

   bool find_unlocks_for_region(const RegionNode* region, LockNode* lock,

                                GrowableArray<AbstractLockNode*> &lock_ops);

   LockNode *find_matching_lock(UnlockNode* unlock);

   // Update the counter to indicate that this lock was eliminated.

   void set_eliminated_lock_counter() PRODUCT_RETURN;

 public:

   AbstractLockNode(const TypeFunc *tf)

     : CallNode(tf, NULL, TypeRawPtr::BOTTOM),

       _kind(Regular)

   {

 #ifndef PRODUCT

     _counter = NULL;

 #endif

   }

   virtual int Opcode() const = 0;

   Node *   obj_node() const       {return in(TypeFunc::Parms + 0); }

   Node *   box_node() const       {return in(TypeFunc::Parms + 1); }

   Node *   fastlock_node() const  {return in(TypeFunc::Parms + 2); }

   void     set_box_node(Node* box) { set_req(TypeFunc::Parms + 1, box); }

   const Type *sub(const Type *t1, const Type *t2) const { return TypeInt::CC;}

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

   bool is_eliminated()  const { return (_kind != Regular); }

   bool is_non_esc_obj() const { return (_kind == NonEscObj); }

   bool is_coarsened()   const { return (_kind == Coarsened); }

   bool is_nested()      const { return (_kind == Nested); }

   const char * kind_as_string() const;

   void log_lock_optimization(Compile* c, const char * tag) const;

   void set_non_esc_obj() { _kind = NonEscObj; set_eliminated_lock_counter(); }

   void set_coarsened()   { _kind = Coarsened; set_eliminated_lock_counter(); }

   void set_nested()      { _kind = Nested; set_eliminated_lock_counter(); }

   // locking does not modify its arguments

   virtual bool may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase){ return false;}

 #ifndef PRODUCT

   void create_lock_counter(JVMState* s);

   NamedCounter* counter() const { return _counter; }

 #endif

 };

 //------------------------------Lock---------------------------------------

 // High-level lock operation

 //

 // This is a subclass of CallNode because it is a macro node which gets expanded

 // into a code sequence containing a call.  This node takes 3 "parameters":

 //    0  -  object to lock

 //    1 -   a BoxLockNode

 //    2 -   a FastLockNode

 //

 class LockNode : public AbstractLockNode {

 public:

   static const TypeFunc *lock_type() {

     // create input type (domain)

     const Type **fields = TypeTuple::fields(3);

     fields[TypeFunc::Parms+0] = TypeInstPtr::NOTNULL;  // Object to be Locked

     fields[TypeFunc::Parms+1] = TypeRawPtr::BOTTOM;    // Address of stack location for lock

     fields[TypeFunc::Parms+2] = TypeInt::BOOL;         // FastLock

     const TypeTuple *domain = TypeTuple::make(TypeFunc::Parms+3,fields);

     // create result type (range)

     fields = TypeTuple::fields(0);

     const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0,fields);

     return TypeFunc::make(domain,range);

   }

   virtual int Opcode() const;

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

   LockNode(Compile* C, const TypeFunc *tf) : AbstractLockNode( tf ) {

     init_class_id(Class_Lock);

     init_flags(Flag_is_macro);

     C->add_macro_node(this);

   }

   virtual bool        guaranteed_safepoint()  { return false; }

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   // Expansion modifies the JVMState, so we need to clone it

   virtual void  clone_jvms(Compile* C) {

     if (jvms() != NULL) {

       set_jvms(jvms()->clone_deep(C));

       jvms()->set_map_deep(this);

     }

   }

   bool is_nested_lock_region(); // Is this Lock nested?

   bool is_nested_lock_region(Compile * c); // Why isn't this Lock nested?

 };

 //------------------------------Unlock---------------------------------------

 // High-level unlock operation

 class UnlockNode : public AbstractLockNode {

 private:

 #ifdef ASSERT

   JVMState* const _dbg_jvms;      // Pointer to list of JVM State objects

 #endif

 public:

   virtual int Opcode() const;

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

   UnlockNode(Compile* C, const TypeFunc *tf) : AbstractLockNode( tf )

 #ifdef ASSERT

     , _dbg_jvms(NULL)

 #endif

   {

     init_class_id(Class_Unlock);

     init_flags(Flag_is_macro);

     C->add_macro_node(this);

   }

   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);

   // unlock is never a safepoint

   virtual bool        guaranteed_safepoint()  { return false; }

 #ifdef ASSERT

   void set_dbg_jvms(JVMState* s) {

     *(JVMState**)&_dbg_jvms = s;  // override const attribute in the accessor

   }

   JVMState* dbg_jvms() const { return _dbg_jvms; }

 #else

   JVMState* dbg_jvms() const { return NULL; }

 #endif

 };

 #endif // SHARE_VM_OPTO_CALLNODE_HPP