src/share/vm/opto/machnode.hpp

Thu, 21 Nov 2013 12:30:35 -0800

author
kvn
date
Thu, 21 Nov 2013 12:30:35 -0800
changeset 6485
da862781b584
parent 6484
318d0622a6d7
child 6487
15120a36272d
permissions
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Merge

     1 /*
     2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     4  *
     5  * This code is free software; you can redistribute it and/or modify it
     6  * under the terms of the GNU General Public License version 2 only, as
     7  * published by the Free Software Foundation.
     8  *
     9  * This code is distributed in the hope that it will be useful, but WITHOUT
    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    12  * version 2 for more details (a copy is included in the LICENSE file that
    13  * accompanied this code).
    14  *
    15  * You should have received a copy of the GNU General Public License version
    16  * 2 along with this work; if not, write to the Free Software Foundation,
    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    18  *
    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    20  * or visit www.oracle.com if you need additional information or have any
    21  * questions.
    22  *
    23  */
    25 #ifndef SHARE_VM_OPTO_MACHNODE_HPP
    26 #define SHARE_VM_OPTO_MACHNODE_HPP
    28 #include "opto/callnode.hpp"
    29 #include "opto/matcher.hpp"
    30 #include "opto/multnode.hpp"
    31 #include "opto/node.hpp"
    32 #include "opto/regmask.hpp"
    34 class BufferBlob;
    35 class CodeBuffer;
    36 class JVMState;
    37 class MachCallDynamicJavaNode;
    38 class MachCallJavaNode;
    39 class MachCallLeafNode;
    40 class MachCallNode;
    41 class MachCallRuntimeNode;
    42 class MachCallStaticJavaNode;
    43 class MachEpilogNode;
    44 class MachIfNode;
    45 class MachNullCheckNode;
    46 class MachOper;
    47 class MachProjNode;
    48 class MachPrologNode;
    49 class MachReturnNode;
    50 class MachSafePointNode;
    51 class MachSpillCopyNode;
    52 class Matcher;
    53 class PhaseRegAlloc;
    54 class RegMask;
    55 class State;
    57 //---------------------------MachOper------------------------------------------
    58 class MachOper : public ResourceObj {
    59 public:
    60   // Allocate right next to the MachNodes in the same arena
    61   void *operator new( size_t x, Compile* C ) throw() { return C->node_arena()->Amalloc_D(x); }
    63   // Opcode
    64   virtual uint opcode() const = 0;
    66   // Number of input edges.
    67   // Generally at least 1
    68   virtual uint num_edges() const { return 1; }
    69   // Array of Register masks
    70   virtual const RegMask *in_RegMask(int index) const;
    72   // Methods to output the encoding of the operand
    74   // Negate conditional branches.  Error for non-branch Nodes
    75   virtual void negate();
    77   // Return the value requested
    78   // result register lookup, corresponding to int_format
    79   virtual int  reg(PhaseRegAlloc *ra_, const Node *node)   const;
    80   // input register lookup, corresponding to ext_format
    81   virtual int  reg(PhaseRegAlloc *ra_, const Node *node, int idx)   const;
    83   // helpers for MacroAssembler generation from ADLC
    84   Register  as_Register(PhaseRegAlloc *ra_, const Node *node)   const {
    85     return ::as_Register(reg(ra_, node));
    86   }
    87   Register  as_Register(PhaseRegAlloc *ra_, const Node *node, int idx)   const {
    88     return ::as_Register(reg(ra_, node, idx));
    89   }
    90   FloatRegister  as_FloatRegister(PhaseRegAlloc *ra_, const Node *node)   const {
    91     return ::as_FloatRegister(reg(ra_, node));
    92   }
    93   FloatRegister  as_FloatRegister(PhaseRegAlloc *ra_, const Node *node, int idx)   const {
    94     return ::as_FloatRegister(reg(ra_, node, idx));
    95   }
    97 #if defined(IA32) || defined(AMD64)
    98   XMMRegister  as_XMMRegister(PhaseRegAlloc *ra_, const Node *node)   const {
    99     return ::as_XMMRegister(reg(ra_, node));
   100   }
   101   XMMRegister  as_XMMRegister(PhaseRegAlloc *ra_, const Node *node, int idx)   const {
   102     return ::as_XMMRegister(reg(ra_, node, idx));
   103   }
   104 #endif
   106   virtual intptr_t  constant() const;
   107   virtual relocInfo::relocType constant_reloc() const;
   108   virtual jdouble constantD() const;
   109   virtual jfloat  constantF() const;
   110   virtual jlong   constantL() const;
   111   virtual TypeOopPtr *oop() const;
   112   virtual int  ccode() const;
   113   // A zero, default, indicates this value is not needed.
   114   // May need to lookup the base register, as done in int_ and ext_format
   115   virtual int  base (PhaseRegAlloc *ra_, const Node *node, int idx) const;
   116   virtual int  index(PhaseRegAlloc *ra_, const Node *node, int idx) const;
   117   virtual int  scale() const;
   118   // Parameters needed to support MEMORY_INTERFACE access to stackSlot
   119   virtual int  disp (PhaseRegAlloc *ra_, const Node *node, int idx) const;
   120   // Check for PC-Relative displacement
   121   virtual relocInfo::relocType disp_reloc() const;
   122   virtual int  constant_disp() const;   // usu. 0, may return Type::OffsetBot
   123   virtual int  base_position()  const;  // base edge position, or -1
   124   virtual int  index_position() const;  // index edge position, or -1
   126   // Access the TypeKlassPtr of operands with a base==RegI and disp==RegP
   127   // Only returns non-null value for i486.ad's indOffset32X
   128   virtual const TypePtr *disp_as_type() const { return NULL; }
   130   // Return the label
   131   virtual Label *label() const;
   133   // Return the method's address
   134   virtual intptr_t  method() const;
   136   // Hash and compare over operands are currently identical
   137   virtual uint  hash() const;
   138   virtual uint  cmp( const MachOper &oper ) const;
   140   // Virtual clone, since I do not know how big the MachOper is.
   141   virtual MachOper *clone(Compile* C) const = 0;
   143   // Return ideal Type from simple operands.  Fail for complex operands.
   144   virtual const Type *type() const;
   146   // Set an integer offset if we have one, or error otherwise
   147   virtual void set_con( jint c0 ) { ShouldNotReachHere();  }
   149 #ifndef PRODUCT
   150   // Return name of operand
   151   virtual const char    *Name() const { return "???";}
   153   // Methods to output the text version of the operand
   154   virtual void int_format(PhaseRegAlloc *,const MachNode *node, outputStream *st) const = 0;
   155   virtual void ext_format(PhaseRegAlloc *,const MachNode *node,int idx, outputStream *st) const=0;
   157   virtual void dump_spec(outputStream *st) const; // Print per-operand info
   159   // Check whether o is a valid oper.
   160   static bool notAnOper(const MachOper *o) {
   161     if (o == NULL)                   return true;
   162     if (((intptr_t)o & 1) != 0)      return true;
   163     if (*(address*)o == badAddress)  return true;  // kill by Node::destruct
   164     return false;
   165   }
   166 #endif // !PRODUCT
   167 };
   169 //------------------------------MachNode---------------------------------------
   170 // Base type for all machine specific nodes.  All node classes generated by the
   171 // ADLC inherit from this class.
   172 class MachNode : public Node {
   173 public:
   174   MachNode() : Node((uint)0), _num_opnds(0), _opnds(NULL) {
   175     init_class_id(Class_Mach);
   176   }
   177   // Required boilerplate
   178   virtual uint size_of() const { return sizeof(MachNode); }
   179   virtual int  Opcode() const;          // Always equal to MachNode
   180   virtual uint rule() const = 0;        // Machine-specific opcode
   181   // Number of inputs which come before the first operand.
   182   // Generally at least 1, to skip the Control input
   183   virtual uint oper_input_base() const { return 1; }
   184   // Position of constant base node in node's inputs. -1 if
   185   // no constant base node input.
   186   virtual uint mach_constant_base_node_input() const { return (uint)-1; }
   188   // Copy inputs and operands to new node of instruction.
   189   // Called from cisc_version() and short_branch_version().
   190   // !!!! The method's body is defined in ad_<arch>.cpp file.
   191   void fill_new_machnode(MachNode *n, Compile* C) const;
   193   // Return an equivalent instruction using memory for cisc_operand position
   194   virtual MachNode *cisc_version(int offset, Compile* C);
   195   // Modify this instruction's register mask to use stack version for cisc_operand
   196   virtual void use_cisc_RegMask();
   198   // Support for short branches
   199   bool may_be_short_branch() const { return (flags() & Flag_may_be_short_branch) != 0; }
   201   // Avoid back to back some instructions on some CPUs.
   202   bool avoid_back_to_back() const { return (flags() & Flag_avoid_back_to_back) != 0; }
   204   // instruction implemented with a call
   205   bool has_call() const { return (flags() & Flag_has_call) != 0; }
   207   // First index in _in[] corresponding to operand, or -1 if there is none
   208   int  operand_index(uint operand) const;
   210   // Register class input is expected in
   211   virtual const RegMask &in_RegMask(uint) const;
   213   // cisc-spillable instructions redefine for use by in_RegMask
   214   virtual const RegMask *cisc_RegMask() const { return NULL; }
   216   // If this instruction is a 2-address instruction, then return the
   217   // index of the input which must match the output.  Not nessecary
   218   // for instructions which bind the input and output register to the
   219   // same singleton regiser (e.g., Intel IDIV which binds AX to be
   220   // both an input and an output).  It is nessecary when the input and
   221   // output have choices - but they must use the same choice.
   222   virtual uint two_adr( ) const { return 0; }
   224   // Array of complex operand pointers.  Each corresponds to zero or
   225   // more leafs.  Must be set by MachNode constructor to point to an
   226   // internal array of MachOpers.  The MachOper array is sized by
   227   // specific MachNodes described in the ADL.
   228   uint _num_opnds;
   229   MachOper **_opnds;
   230   uint  num_opnds() const { return _num_opnds; }
   232   // Emit bytes into cbuf
   233   virtual void  emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   234   // Expand node after register allocation.
   235   // Node is replaced by several nodes in the postalloc expand phase.
   236   // Corresponding methods are generated for nodes if they specify
   237   // postalloc_expand. See block.cpp for more documentation.
   238   virtual bool requires_postalloc_expand() const { return false; }
   239   virtual void postalloc_expand(GrowableArray <Node *> *nodes, PhaseRegAlloc *ra_);
   240   // Size of instruction in bytes
   241   virtual uint  size(PhaseRegAlloc *ra_) const;
   242   // Helper function that computes size by emitting code
   243   virtual uint  emit_size(PhaseRegAlloc *ra_) const;
   245   // Return the alignment required (in units of relocInfo::addr_unit())
   246   // for this instruction (must be a power of 2)
   247   virtual int   alignment_required() const { return 1; }
   249   // Return the padding (in bytes) to be emitted before this
   250   // instruction to properly align it.
   251   virtual int   compute_padding(int current_offset) const { return 0; }
   253   // Return number of relocatable values contained in this instruction
   254   virtual int   reloc() const { return 0; }
   256   // Return number of words used for double constants in this instruction
   257   virtual int   ins_num_consts() const { return 0; }
   259   // Hash and compare over operands.  Used to do GVN on machine Nodes.
   260   virtual uint  hash() const;
   261   virtual uint  cmp( const Node &n ) const;
   263   // Expand method for MachNode, replaces nodes representing pseudo
   264   // instructions with a set of nodes which represent real machine
   265   // instructions and compute the same value.
   266   virtual MachNode *Expand( State *, Node_List &proj_list, Node* mem ) { return this; }
   268   // Bottom_type call; value comes from operand0
   269   virtual const class Type *bottom_type() const { return _opnds[0]->type(); }
   270   virtual uint ideal_reg() const { const Type *t = _opnds[0]->type(); return t == TypeInt::CC ? Op_RegFlags : t->ideal_reg(); }
   272   // If this is a memory op, return the base pointer and fixed offset.
   273   // If there are no such, return NULL.  If there are multiple addresses
   274   // or the address is indeterminate (rare cases) then return (Node*)-1,
   275   // which serves as node bottom.
   276   // If the offset is not statically determined, set it to Type::OffsetBot.
   277   // This method is free to ignore stack slots if that helps.
   278   #define TYPE_PTR_SENTINAL  ((const TypePtr*)-1)
   279   // Passing TYPE_PTR_SENTINAL as adr_type asks for computation of the adr_type if possible
   280   const Node* get_base_and_disp(intptr_t &offset, const TypePtr* &adr_type) const;
   282   // Helper for get_base_and_disp: find the base and index input nodes.
   283   // Returns the MachOper as determined by memory_operand(), for use, if
   284   // needed by the caller. If (MachOper *)-1 is returned, base and index
   285   // are set to NodeSentinel. If (MachOper *) NULL is returned, base and
   286   // index are set to NULL.
   287   const MachOper* memory_inputs(Node* &base, Node* &index) const;
   289   // Helper for memory_inputs:  Which operand carries the necessary info?
   290   // By default, returns NULL, which means there is no such operand.
   291   // If it returns (MachOper*)-1, this means there are multiple memories.
   292   virtual const MachOper* memory_operand() const { return NULL; }
   294   // Call "get_base_and_disp" to decide which category of memory is used here.
   295   virtual const class TypePtr *adr_type() const;
   297   // Apply peephole rule(s) to this instruction
   298   virtual MachNode *peephole( Block *block, int block_index, PhaseRegAlloc *ra_, int &deleted, Compile* C );
   300   // Top-level ideal Opcode matched
   301   virtual int ideal_Opcode()     const { return Op_Node; }
   303   // Adds the label for the case
   304   virtual void add_case_label( int switch_val, Label* blockLabel);
   306   // Set the absolute address for methods
   307   virtual void method_set( intptr_t addr );
   309   // Should we clone rather than spill this instruction?
   310   bool rematerialize() const;
   312   // Get the pipeline info
   313   static const Pipeline *pipeline_class();
   314   virtual const Pipeline *pipeline() const;
   316 #ifndef PRODUCT
   317   virtual const char *Name() const = 0; // Machine-specific name
   318   virtual void dump_spec(outputStream *st) const; // Print per-node info
   319   void         dump_format(PhaseRegAlloc *ra, outputStream *st) const; // access to virtual
   320 #endif
   321 };
   323 //------------------------------MachIdealNode----------------------------
   324 // Machine specific versions of nodes that must be defined by user.
   325 // These are not converted by matcher from ideal nodes to machine nodes
   326 // but are inserted into the code by the compiler.
   327 class MachIdealNode : public MachNode {
   328 public:
   329   MachIdealNode( ) {}
   331   // Define the following defaults for non-matched machine nodes
   332   virtual uint oper_input_base() const { return 0; }
   333   virtual uint rule()            const { return 9999999; }
   334   virtual const class Type *bottom_type() const { return _opnds == NULL ? Type::CONTROL : MachNode::bottom_type(); }
   335 };
   337 //------------------------------MachTypeNode----------------------------
   338 // Machine Nodes that need to retain a known Type.
   339 class MachTypeNode : public MachNode {
   340   virtual uint size_of() const { return sizeof(*this); } // Size is bigger
   341 public:
   342   MachTypeNode( ) {}
   343   const Type *_bottom_type;
   345   virtual const class Type *bottom_type() const { return _bottom_type; }
   346 #ifndef PRODUCT
   347   virtual void dump_spec(outputStream *st) const;
   348 #endif
   349 };
   351 //------------------------------MachBreakpointNode----------------------------
   352 // Machine breakpoint or interrupt Node
   353 class MachBreakpointNode : public MachIdealNode {
   354 public:
   355   MachBreakpointNode( ) {}
   356   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   357   virtual uint size(PhaseRegAlloc *ra_) const;
   359 #ifndef PRODUCT
   360   virtual const char *Name() const { return "Breakpoint"; }
   361   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   362 #endif
   363 };
   365 //------------------------------MachConstantBaseNode--------------------------
   366 // Machine node that represents the base address of the constant table.
   367 class MachConstantBaseNode : public MachIdealNode {
   368 public:
   369   static const RegMask& _out_RegMask;  // We need the out_RegMask statically in MachConstantNode::in_RegMask().
   371 public:
   372   MachConstantBaseNode() : MachIdealNode() {
   373     init_class_id(Class_MachConstantBase);
   374   }
   375   virtual const class Type* bottom_type() const { return TypeRawPtr::NOTNULL; }
   376   virtual uint ideal_reg() const { return Op_RegP; }
   377   virtual uint oper_input_base() const { return 1; }
   379   virtual bool requires_postalloc_expand() const;
   380   virtual void postalloc_expand(GrowableArray <Node *> *nodes, PhaseRegAlloc *ra_);
   382   virtual void emit(CodeBuffer& cbuf, PhaseRegAlloc* ra_) const;
   383   virtual uint size(PhaseRegAlloc* ra_) const;
   384   virtual bool pinned() const { return UseRDPCForConstantTableBase; }
   386   static const RegMask& static_out_RegMask() { return _out_RegMask; }
   387   virtual const RegMask& out_RegMask() const { return static_out_RegMask(); }
   389 #ifndef PRODUCT
   390   virtual const char* Name() const { return "MachConstantBaseNode"; }
   391   virtual void format(PhaseRegAlloc*, outputStream* st) const;
   392 #endif
   393 };
   395 //------------------------------MachConstantNode-------------------------------
   396 // Machine node that holds a constant which is stored in the constant table.
   397 class MachConstantNode : public MachTypeNode {
   398 protected:
   399   Compile::Constant _constant;  // This node's constant.
   401 public:
   402   MachConstantNode() : MachTypeNode() {
   403     init_class_id(Class_MachConstant);
   404   }
   406   virtual void eval_constant(Compile* C) {
   407 #ifdef ASSERT
   408     tty->print("missing MachConstantNode eval_constant function: ");
   409     dump();
   410 #endif
   411     ShouldNotCallThis();
   412   }
   414   virtual const RegMask &in_RegMask(uint idx) const {
   415     if (idx == mach_constant_base_node_input())
   416       return MachConstantBaseNode::static_out_RegMask();
   417     return MachNode::in_RegMask(idx);
   418   }
   420   // Input edge of MachConstantBaseNode.
   421   virtual uint mach_constant_base_node_input() const { return req() - 1; }
   423   int  constant_offset();
   424   int  constant_offset() const { return ((MachConstantNode*) this)->constant_offset(); }
   425   // Unchecked version to avoid assertions in debug output.
   426   int  constant_offset_unchecked() const;
   427 };
   429 //------------------------------MachUEPNode-----------------------------------
   430 // Machine Unvalidated Entry Point Node
   431 class MachUEPNode : public MachIdealNode {
   432 public:
   433   MachUEPNode( ) {}
   434   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   435   virtual uint size(PhaseRegAlloc *ra_) const;
   437 #ifndef PRODUCT
   438   virtual const char *Name() const { return "Unvalidated-Entry-Point"; }
   439   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   440 #endif
   441 };
   443 //------------------------------MachPrologNode--------------------------------
   444 // Machine function Prolog Node
   445 class MachPrologNode : public MachIdealNode {
   446 public:
   447   MachPrologNode( ) {}
   448   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   449   virtual uint size(PhaseRegAlloc *ra_) const;
   450   virtual int reloc() const;
   452 #ifndef PRODUCT
   453   virtual const char *Name() const { return "Prolog"; }
   454   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   455 #endif
   456 };
   458 //------------------------------MachEpilogNode--------------------------------
   459 // Machine function Epilog Node
   460 class MachEpilogNode : public MachIdealNode {
   461 public:
   462   MachEpilogNode(bool do_poll = false) : _do_polling(do_poll) {}
   463   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   464   virtual uint size(PhaseRegAlloc *ra_) const;
   465   virtual int reloc() const;
   466   virtual const Pipeline *pipeline() const;
   468 private:
   469   bool _do_polling;
   471 public:
   472   bool do_polling() const { return _do_polling; }
   474   // Offset of safepoint from the beginning of the node
   475   int safepoint_offset() const;
   477 #ifndef PRODUCT
   478   virtual const char *Name() const { return "Epilog"; }
   479   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   480 #endif
   481 };
   483 //------------------------------MachNopNode-----------------------------------
   484 // Machine function Nop Node
   485 class MachNopNode : public MachIdealNode {
   486 private:
   487   int _count;
   488 public:
   489   MachNopNode( ) : _count(1) {}
   490   MachNopNode( int count ) : _count(count) {}
   491   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   492   virtual uint size(PhaseRegAlloc *ra_) const;
   494   virtual const class Type *bottom_type() const { return Type::CONTROL; }
   496   virtual int ideal_Opcode() const { return Op_Con; } // bogus; see output.cpp
   497   virtual const Pipeline *pipeline() const;
   498 #ifndef PRODUCT
   499   virtual const char *Name() const { return "Nop"; }
   500   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   501   virtual void dump_spec(outputStream *st) const { } // No per-operand info
   502 #endif
   503 };
   505 //------------------------------MachSpillCopyNode------------------------------
   506 // Machine SpillCopy Node.  Copies 1 or 2 words from any location to any
   507 // location (stack or register).
   508 class MachSpillCopyNode : public MachIdealNode {
   509   const RegMask *_in;           // RegMask for input
   510   const RegMask *_out;          // RegMask for output
   511   const Type *_type;
   512 public:
   513   MachSpillCopyNode( Node *n, const RegMask &in, const RegMask &out ) :
   514     MachIdealNode(), _in(&in), _out(&out), _type(n->bottom_type()) {
   515     init_class_id(Class_MachSpillCopy);
   516     init_flags(Flag_is_Copy);
   517     add_req(NULL);
   518     add_req(n);
   519   }
   520   virtual uint size_of() const { return sizeof(*this); }
   521   void set_out_RegMask(const RegMask &out) { _out = &out; }
   522   void set_in_RegMask(const RegMask &in) { _in = &in; }
   523   virtual const RegMask &out_RegMask() const { return *_out; }
   524   virtual const RegMask &in_RegMask(uint) const { return *_in; }
   525   virtual const class Type *bottom_type() const { return _type; }
   526   virtual uint ideal_reg() const { return _type->ideal_reg(); }
   527   virtual uint oper_input_base() const { return 1; }
   528   uint implementation( CodeBuffer *cbuf, PhaseRegAlloc *ra_, bool do_size, outputStream* st ) const;
   530   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   531   virtual uint size(PhaseRegAlloc *ra_) const;
   533 #ifndef PRODUCT
   534   virtual const char *Name() const { return "MachSpillCopy"; }
   535   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   536 #endif
   537 };
   539 //------------------------------MachBranchNode--------------------------------
   540 // Abstract machine branch Node
   541 class MachBranchNode : public MachIdealNode {
   542 public:
   543   MachBranchNode() : MachIdealNode() {
   544     init_class_id(Class_MachBranch);
   545   }
   546   virtual void label_set(Label* label, uint block_num) = 0;
   547   virtual void save_label(Label** label, uint* block_num) = 0;
   549   // Support for short branches
   550   virtual MachNode *short_branch_version(Compile* C) { return NULL; }
   552   virtual bool pinned() const { return true; };
   553 };
   555 //------------------------------MachNullChkNode--------------------------------
   556 // Machine-dependent null-pointer-check Node.  Points a real MachNode that is
   557 // also some kind of memory op.  Turns the indicated MachNode into a
   558 // conditional branch with good latency on the ptr-not-null path and awful
   559 // latency on the pointer-is-null path.
   561 class MachNullCheckNode : public MachBranchNode {
   562 public:
   563   const uint _vidx;             // Index of memop being tested
   564   MachNullCheckNode( Node *ctrl, Node *memop, uint vidx ) : MachBranchNode(), _vidx(vidx) {
   565     init_class_id(Class_MachNullCheck);
   566     add_req(ctrl);
   567     add_req(memop);
   568   }
   569   virtual uint size_of() const { return sizeof(*this); }
   571   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   572   virtual void label_set(Label* label, uint block_num);
   573   virtual void save_label(Label** label, uint* block_num);
   574   virtual void negate() { }
   575   virtual const class Type *bottom_type() const { return TypeTuple::IFBOTH; }
   576   virtual uint ideal_reg() const { return NotAMachineReg; }
   577   virtual const RegMask &in_RegMask(uint) const;
   578   virtual const RegMask &out_RegMask() const { return RegMask::Empty; }
   579 #ifndef PRODUCT
   580   virtual const char *Name() const { return "NullCheck"; }
   581   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
   582 #endif
   583 };
   585 //------------------------------MachProjNode----------------------------------
   586 // Machine-dependent Ideal projections (how is that for an oxymoron).  Really
   587 // just MachNodes made by the Ideal world that replicate simple projections
   588 // but with machine-dependent input & output register masks.  Generally
   589 // produced as part of calling conventions.  Normally I make MachNodes as part
   590 // of the Matcher process, but the Matcher is ill suited to issues involving
   591 // frame handling, so frame handling is all done in the Ideal world with
   592 // occasional callbacks to the machine model for important info.
   593 class MachProjNode : public ProjNode {
   594 public:
   595   MachProjNode( Node *multi, uint con, const RegMask &out, uint ideal_reg ) : ProjNode(multi,con), _rout(out), _ideal_reg(ideal_reg) {
   596     init_class_id(Class_MachProj);
   597   }
   598   RegMask _rout;
   599   const uint  _ideal_reg;
   600   enum projType {
   601     unmatched_proj = 0,         // Projs for Control, I/O, memory not matched
   602     fat_proj       = 999        // Projs killing many regs, defined by _rout
   603   };
   604   virtual int   Opcode() const;
   605   virtual const Type *bottom_type() const;
   606   virtual const TypePtr *adr_type() const;
   607   virtual const RegMask &in_RegMask(uint) const { return RegMask::Empty; }
   608   virtual const RegMask &out_RegMask() const { return _rout; }
   609   virtual uint  ideal_reg() const { return _ideal_reg; }
   610   // Need size_of() for virtual ProjNode::clone()
   611   virtual uint  size_of() const { return sizeof(MachProjNode); }
   612 #ifndef PRODUCT
   613   virtual void dump_spec(outputStream *st) const;
   614 #endif
   615 };
   617 //------------------------------MachIfNode-------------------------------------
   618 // Machine-specific versions of IfNodes
   619 class MachIfNode : public MachBranchNode {
   620   virtual uint size_of() const { return sizeof(*this); } // Size is bigger
   621 public:
   622   float _prob;                  // Probability branch goes either way
   623   float _fcnt;                  // Frequency counter
   624   MachIfNode() : MachBranchNode() {
   625     init_class_id(Class_MachIf);
   626   }
   627   // Negate conditional branches.
   628   virtual void negate() = 0;
   629 #ifndef PRODUCT
   630   virtual void dump_spec(outputStream *st) const;
   631 #endif
   632 };
   634 //------------------------------MachGotoNode-----------------------------------
   635 // Machine-specific versions of GotoNodes
   636 class MachGotoNode : public MachBranchNode {
   637 public:
   638   MachGotoNode() : MachBranchNode() {
   639     init_class_id(Class_MachGoto);
   640   }
   641 };
   643 //------------------------------MachFastLockNode-------------------------------------
   644 // Machine-specific versions of FastLockNodes
   645 class MachFastLockNode : public MachNode {
   646   virtual uint size_of() const { return sizeof(*this); } // Size is bigger
   647 public:
   648   BiasedLockingCounters* _counters;
   650   MachFastLockNode() : MachNode() {}
   651 };
   653 //------------------------------MachReturnNode--------------------------------
   654 // Machine-specific versions of subroutine returns
   655 class MachReturnNode : public MachNode {
   656   virtual uint size_of() const; // Size is bigger
   657 public:
   658   RegMask *_in_rms;             // Input register masks, set during allocation
   659   ReallocMark _nesting;         // assertion check for reallocations
   660   const TypePtr* _adr_type;     // memory effects of call or return
   661   MachReturnNode() : MachNode() {
   662     init_class_id(Class_MachReturn);
   663     _adr_type = TypePtr::BOTTOM; // the default: all of memory
   664   }
   666   void set_adr_type(const TypePtr* atp) { _adr_type = atp; }
   668   virtual const RegMask &in_RegMask(uint) const;
   669   virtual bool pinned() const { return true; };
   670   virtual const TypePtr *adr_type() const;
   671 };
   673 //------------------------------MachSafePointNode-----------------------------
   674 // Machine-specific versions of safepoints
   675 class MachSafePointNode : public MachReturnNode {
   676 public:
   677   OopMap*         _oop_map;     // Array of OopMap info (8-bit char) for GC
   678   JVMState*       _jvms;        // Pointer to list of JVM State Objects
   679   uint            _jvmadj;      // Extra delta to jvms indexes (mach. args)
   680   OopMap*         oop_map() const { return _oop_map; }
   681   void            set_oop_map(OopMap* om) { _oop_map = om; }
   683   MachSafePointNode() : MachReturnNode(), _oop_map(NULL), _jvms(NULL), _jvmadj(0) {
   684     init_class_id(Class_MachSafePoint);
   685   }
   687   virtual JVMState* jvms() const { return _jvms; }
   688   void set_jvms(JVMState* s) {
   689     _jvms = s;
   690   }
   691   virtual const Type    *bottom_type() const;
   693   virtual const RegMask &in_RegMask(uint) const;
   695   // Functionality from old debug nodes
   696   Node *returnadr() const { return in(TypeFunc::ReturnAdr); }
   697   Node *frameptr () const { return in(TypeFunc::FramePtr); }
   699   Node *local(const JVMState* jvms, uint idx) const {
   700     assert(verify_jvms(jvms), "jvms must match");
   701     return in(_jvmadj + jvms->locoff() + idx);
   702   }
   703   Node *stack(const JVMState* jvms, uint idx) const {
   704     assert(verify_jvms(jvms), "jvms must match");
   705     return in(_jvmadj + jvms->stkoff() + idx);
   706  }
   707   Node *monitor_obj(const JVMState* jvms, uint idx) const {
   708     assert(verify_jvms(jvms), "jvms must match");
   709     return in(_jvmadj + jvms->monitor_obj_offset(idx));
   710   }
   711   Node *monitor_box(const JVMState* jvms, uint idx) const {
   712     assert(verify_jvms(jvms), "jvms must match");
   713     return in(_jvmadj + jvms->monitor_box_offset(idx));
   714   }
   715   void  set_local(const JVMState* jvms, uint idx, Node *c) {
   716     assert(verify_jvms(jvms), "jvms must match");
   717     set_req(_jvmadj + jvms->locoff() + idx, c);
   718   }
   719   void  set_stack(const JVMState* jvms, uint idx, Node *c) {
   720     assert(verify_jvms(jvms), "jvms must match");
   721     set_req(_jvmadj + jvms->stkoff() + idx, c);
   722   }
   723   void  set_monitor(const JVMState* jvms, uint idx, Node *c) {
   724     assert(verify_jvms(jvms), "jvms must match");
   725     set_req(_jvmadj + jvms->monoff() + idx, c);
   726   }
   727 };
   729 //------------------------------MachCallNode----------------------------------
   730 // Machine-specific versions of subroutine calls
   731 class MachCallNode : public MachSafePointNode {
   732 protected:
   733   virtual uint hash() const { return NO_HASH; }  // CFG nodes do not hash
   734   virtual uint cmp( const Node &n ) const;
   735   virtual uint size_of() const = 0; // Size is bigger
   736 public:
   737   const TypeFunc *_tf;        // Function type
   738   address      _entry_point;  // Address of the method being called
   739   float        _cnt;          // Estimate of number of times called
   740   uint         _argsize;      // Size of argument block on stack
   742   const TypeFunc* tf()        const { return _tf; }
   743   const address entry_point() const { return _entry_point; }
   744   const float   cnt()         const { return _cnt; }
   745   uint argsize()              const { return _argsize; }
   747   void set_tf(const TypeFunc* tf) { _tf = tf; }
   748   void set_entry_point(address p) { _entry_point = p; }
   749   void set_cnt(float c)           { _cnt = c; }
   750   void set_argsize(int s)         { _argsize = s; }
   752   MachCallNode() : MachSafePointNode() {
   753     init_class_id(Class_MachCall);
   754   }
   756   virtual const Type *bottom_type() const;
   757   virtual bool  pinned() const { return false; }
   758   virtual const Type *Value( PhaseTransform *phase ) const;
   759   virtual const RegMask &in_RegMask(uint) const;
   760   virtual int ret_addr_offset() { return 0; }
   762   bool returns_long() const { return tf()->return_type() == T_LONG; }
   763   bool return_value_is_used() const;
   764 #ifndef PRODUCT
   765   virtual void dump_spec(outputStream *st) const;
   766 #endif
   767 };
   769 //------------------------------MachCallJavaNode------------------------------
   770 // "Base" class for machine-specific versions of subroutine calls
   771 class MachCallJavaNode : public MachCallNode {
   772 protected:
   773   virtual uint cmp( const Node &n ) const;
   774   virtual uint size_of() const; // Size is bigger
   775 public:
   776   ciMethod* _method;             // Method being direct called
   777   int        _bci;               // Byte Code index of call byte code
   778   bool       _optimized_virtual; // Tells if node is a static call or an optimized virtual
   779   bool       _method_handle_invoke;   // Tells if the call has to preserve SP
   780   MachCallJavaNode() : MachCallNode() {
   781     init_class_id(Class_MachCallJava);
   782   }
   784   virtual const RegMask &in_RegMask(uint) const;
   786 #ifndef PRODUCT
   787   virtual void dump_spec(outputStream *st) const;
   788 #endif
   789 };
   791 //------------------------------MachCallStaticJavaNode------------------------
   792 // Machine-specific versions of monomorphic subroutine calls
   793 class MachCallStaticJavaNode : public MachCallJavaNode {
   794   virtual uint cmp( const Node &n ) const;
   795   virtual uint size_of() const; // Size is bigger
   796 public:
   797   const char *_name;            // Runtime wrapper name
   798   MachCallStaticJavaNode() : MachCallJavaNode() {
   799     init_class_id(Class_MachCallStaticJava);
   800   }
   802   // If this is an uncommon trap, return the request code, else zero.
   803   int uncommon_trap_request() const;
   805   virtual int ret_addr_offset();
   806 #ifndef PRODUCT
   807   virtual void dump_spec(outputStream *st) const;
   808   void dump_trap_args(outputStream *st) const;
   809 #endif
   810 };
   812 //------------------------------MachCallDynamicJavaNode------------------------
   813 // Machine-specific versions of possibly megamorphic subroutine calls
   814 class MachCallDynamicJavaNode : public MachCallJavaNode {
   815 public:
   816   int _vtable_index;
   817   MachCallDynamicJavaNode() : MachCallJavaNode() {
   818     init_class_id(Class_MachCallDynamicJava);
   819     DEBUG_ONLY(_vtable_index = -99);  // throw an assert if uninitialized
   820   }
   821   virtual int ret_addr_offset();
   822 #ifndef PRODUCT
   823   virtual void dump_spec(outputStream *st) const;
   824 #endif
   825 };
   827 //------------------------------MachCallRuntimeNode----------------------------
   828 // Machine-specific versions of subroutine calls
   829 class MachCallRuntimeNode : public MachCallNode {
   830   virtual uint cmp( const Node &n ) const;
   831   virtual uint size_of() const; // Size is bigger
   832 public:
   833   const char *_name;            // Printable name, if _method is NULL
   834   MachCallRuntimeNode() : MachCallNode() {
   835     init_class_id(Class_MachCallRuntime);
   836   }
   837   virtual int ret_addr_offset();
   838 #ifndef PRODUCT
   839   virtual void dump_spec(outputStream *st) const;
   840 #endif
   841 };
   843 class MachCallLeafNode: public MachCallRuntimeNode {
   844 public:
   845   MachCallLeafNode() : MachCallRuntimeNode() {
   846     init_class_id(Class_MachCallLeaf);
   847   }
   848 };
   850 //------------------------------MachHaltNode-----------------------------------
   851 // Machine-specific versions of halt nodes
   852 class MachHaltNode : public MachReturnNode {
   853 public:
   854   virtual JVMState* jvms() const;
   855 };
   858 //------------------------------MachTempNode-----------------------------------
   859 // Node used by the adlc to construct inputs to represent temporary registers
   860 class MachTempNode : public MachNode {
   861 private:
   862   MachOper *_opnd_array[1];
   864 public:
   865   virtual const RegMask &out_RegMask() const { return *_opnds[0]->in_RegMask(0); }
   866   virtual uint rule() const { return 9999999; }
   867   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {}
   869   MachTempNode(MachOper* oper) {
   870     init_class_id(Class_MachTemp);
   871     _num_opnds = 1;
   872     _opnds = _opnd_array;
   873     add_req(NULL);
   874     _opnds[0] = oper;
   875   }
   876   virtual uint size_of() const { return sizeof(MachTempNode); }
   878 #ifndef PRODUCT
   879   virtual void format(PhaseRegAlloc *, outputStream *st ) const {}
   880   virtual const char *Name() const { return "MachTemp";}
   881 #endif
   882 };
   886 //------------------------------labelOper--------------------------------------
   887 // Machine-independent version of label operand
   888 class labelOper : public MachOper {
   889 private:
   890   virtual uint           num_edges() const { return 0; }
   891 public:
   892   // Supported for fixed size branches
   893   Label* _label;                // Label for branch(es)
   895   uint _block_num;
   897   labelOper() : _block_num(0), _label(0) {}
   899   labelOper(Label* label, uint block_num) : _label(label), _block_num(block_num) {}
   901   labelOper(labelOper* l) : _label(l->_label) , _block_num(l->_block_num) {}
   903   virtual MachOper *clone(Compile* C) const;
   905   virtual Label *label() const { assert(_label != NULL, "need Label"); return _label; }
   907   virtual uint           opcode() const;
   909   virtual uint           hash()   const;
   910   virtual uint           cmp( const MachOper &oper ) const;
   911 #ifndef PRODUCT
   912   virtual const char    *Name()   const { return "Label";}
   914   virtual void int_format(PhaseRegAlloc *ra, const MachNode *node, outputStream *st) const;
   915   virtual void ext_format(PhaseRegAlloc *ra, const MachNode *node, int idx, outputStream *st) const { int_format( ra, node, st ); }
   916 #endif
   917 };
   920 //------------------------------methodOper--------------------------------------
   921 // Machine-independent version of method operand
   922 class methodOper : public MachOper {
   923 private:
   924   virtual uint           num_edges() const { return 0; }
   925 public:
   926   intptr_t _method;             // Address of method
   927   methodOper() :   _method(0) {}
   928   methodOper(intptr_t method) : _method(method)  {}
   930   virtual MachOper *clone(Compile* C) const;
   932   virtual intptr_t method() const { return _method; }
   934   virtual uint           opcode() const;
   936   virtual uint           hash()   const;
   937   virtual uint           cmp( const MachOper &oper ) const;
   938 #ifndef PRODUCT
   939   virtual const char    *Name()   const { return "Method";}
   941   virtual void int_format(PhaseRegAlloc *ra, const MachNode *node, outputStream *st) const;
   942   virtual void ext_format(PhaseRegAlloc *ra, const MachNode *node, int idx, outputStream *st) const { int_format( ra, node, st ); }
   943 #endif
   944 };
   946 #endif // SHARE_VM_OPTO_MACHNODE_HPP

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