/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

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

 *

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

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

 * published by the Free Software Foundation.

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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

 * questions.

 *

 */

#ifndef SHARE_VM_OPTO_ARRAYCOPYNODE_HPP

#define SHARE_VM_OPTO_ARRAYCOPYNODE_HPP

#include "opto/callnode.hpp"

class GraphKit;

class ArrayCopyNode : public CallNode {

private:

  // What kind of arraycopy variant is this?

  enum {

    None,            // not set yet

    ArrayCopy,       // System.arraycopy()

    CloneBasic,      // A clone that can be copied by 64 bit chunks

    CloneOop,        // An oop array clone

    CopyOf,          // Arrays.copyOf()

    CopyOfRange      // Arrays.copyOfRange()

  } _kind;

#ifndef PRODUCT

  static const char* _kind_names[CopyOfRange+1];

#endif

  // Is the alloc obtained with

  // AllocateArrayNode::Ideal_array_allocation() tighly coupled

  // (arraycopy follows immediately the allocation)?

  // We cache the result of LibraryCallKit::tightly_coupled_allocation

  // here because it's much easier to find whether there's a tightly

  // couple allocation at parse time than at macro expansion time. At

  // macro expansion time, for every use of the allocation node we

  // would need to figure out whether it happens after the arraycopy (and

  // can be ignored) or between the allocation and the arraycopy. At

  // parse time, it's straightforward because whatever happens after

  // the arraycopy is not parsed yet so doesn't exist when

  // LibraryCallKit::tightly_coupled_allocation() is called.

  bool _alloc_tightly_coupled;

  bool _arguments_validated;

  static const TypeFunc* arraycopy_type() {

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

    fields[Src]       = TypeInstPtr::BOTTOM;

    fields[SrcPos]    = TypeInt::INT;

    fields[Dest]      = TypeInstPtr::BOTTOM;

    fields[DestPos]   = TypeInt::INT;

    fields[Length]    = TypeInt::INT;

    fields[SrcLen]    = TypeInt::INT;

    fields[DestLen]   = TypeInt::INT;

    fields[SrcKlass]  = TypeKlassPtr::BOTTOM;

    fields[DestKlass] = TypeKlassPtr::BOTTOM;

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

    // create result type (range)

    fields = TypeTuple::fields(0);

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

    return TypeFunc::make(domain, range);

  }

  ArrayCopyNode(Compile* C, bool alloc_tightly_coupled);

  intptr_t get_length_if_constant(PhaseGVN *phase) const;

  int get_count(PhaseGVN *phase) const;

  static const TypePtr* get_address_type(PhaseGVN *phase, Node* n);

  Node* try_clone_instance(PhaseGVN *phase, bool can_reshape, int count);

  bool prepare_array_copy(PhaseGVN *phase, bool can_reshape,

                          Node*& adr_src, Node*& base_src, Node*& adr_dest, Node*& base_dest,

                          BasicType& copy_type, const Type*& value_type, bool& disjoint_bases);

  void array_copy_test_overlap(PhaseGVN *phase, bool can_reshape,

                               bool disjoint_bases, int count,

                               Node*& forward_ctl, Node*& backward_ctl);

  Node* array_copy_forward(PhaseGVN *phase, bool can_reshape, Node* ctl,

                           Node* start_mem_src, Node* start_mem_dest,

                           const TypePtr* atp_src, const TypePtr* atp_dest,

                           Node* adr_src, Node* base_src, Node* adr_dest, Node* base_dest,

                           BasicType copy_type, const Type* value_type, int count);

  Node* array_copy_backward(PhaseGVN *phase, bool can_reshape, Node* ctl,

                            Node *start_mem_src, Node* start_mem_dest,

                            const TypePtr* atp_src, const TypePtr* atp_dest,

                            Node* adr_src, Node* base_src, Node* adr_dest, Node* base_dest,

                            BasicType copy_type, const Type* value_type, int count);

  bool finish_transform(PhaseGVN *phase, bool can_reshape,

                        Node* ctl, Node *mem);

  static bool may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase, ArrayCopyNode*& ac);

public:

  enum {

    Src   = TypeFunc::Parms,

    SrcPos,

    Dest,

    DestPos,

    Length,

    SrcLen,

    DestLen,

    SrcKlass,

    DestKlass,

    ParmLimit

  };

  // Results from escape analysis for non escaping inputs

  const TypeOopPtr* _src_type;

  const TypeOopPtr* _dest_type;

  static ArrayCopyNode* make(GraphKit* kit, bool may_throw,

                             Node* src, Node* src_offset,

                             Node* dest,  Node* dest_offset,

                             Node* length,

                             bool alloc_tightly_coupled,

                             Node* src_klass = NULL, Node* dest_klass = NULL,

                             Node* src_length = NULL, Node* dest_length = NULL);

  void connect_outputs(GraphKit* kit);

  bool is_arraycopy()             const  { assert(_kind != None, "should bet set"); return _kind == ArrayCopy; }

  bool is_arraycopy_validated()   const  { assert(_kind != None, "should bet set"); return _kind == ArrayCopy && _arguments_validated; }

  bool is_clonebasic()            const  { assert(_kind != None, "should bet set"); return _kind == CloneBasic; }

  bool is_cloneoop()              const  { assert(_kind != None, "should bet set"); return _kind == CloneOop; }

  bool is_copyof()                const  { assert(_kind != None, "should bet set"); return _kind == CopyOf; }

  bool is_copyof_validated()      const  { assert(_kind != None, "should bet set"); return _kind == CopyOf && _arguments_validated; }

  bool is_copyofrange()           const  { assert(_kind != None, "should bet set"); return _kind == CopyOfRange; }

  bool is_copyofrange_validated() const  { assert(_kind != None, "should bet set"); return _kind == CopyOfRange && _arguments_validated; }

  void set_arraycopy(bool validated)   { assert(_kind == None, "shouldn't bet set yet"); _kind = ArrayCopy; _arguments_validated = validated; }

  void set_clonebasic()                { assert(_kind == None, "shouldn't bet set yet"); _kind = CloneBasic; }

  void set_cloneoop()                  { assert(_kind == None, "shouldn't bet set yet"); _kind = CloneOop; }

  void set_copyof(bool validated)      { assert(_kind == None, "shouldn't bet set yet"); _kind = CopyOf; _arguments_validated = validated; }

  void set_copyofrange(bool validated) { assert(_kind == None, "shouldn't bet set yet"); _kind = CopyOfRange; _arguments_validated = validated; }

  virtual int Opcode() const;

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

  virtual bool guaranteed_safepoint()  { return false; }

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

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

  bool is_alloc_tightly_coupled() const { return _alloc_tightly_coupled; }

  static bool may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase, ArrayCopyNode*& ac);

  bool modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify);

#ifndef PRODUCT

  virtual void dump_spec(outputStream *st) const;

  virtual void dump_compact_spec(outputStream* st) const;

#endif

};

#endif // SHARE_VM_OPTO_ARRAYCOPYNODE_HPP