/*

 * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

class StringConcat;

class PhaseStringOpts : public Phase {

  friend class StringConcat;

 private:

  PhaseGVN* _gvn;

  // List of dead nodes to clean up aggressively at the end

  Unique_Node_List dead_worklist;

  // Memory slices needed for code gen

  int char_adr_idx;

  int value_field_idx;

  int count_field_idx;

  int offset_field_idx;

  // Integer.sizeTable - used for int to String conversion

  ciField* size_table_field;

  // A set for use by various stages

  VectorSet _visited;

  // Collect a list of all SB.toString calls

  Node_List collect_toString_calls();

  // Examine the use of the SB alloc to see if it can be replace with

  // a single string construction.

  StringConcat* build_candidate(CallStaticJavaNode* call);

  // Replace all the SB calls in concat with an optimization String allocation

  void replace_string_concat(StringConcat* concat);

  // Load the value of a static field, performing any constant folding.

  Node* fetch_static_field(GraphKit& kit, ciField* field);

  // Compute the number of characters required to represent the int value

  Node* int_stringSize(GraphKit& kit, Node* value);

  // Copy the characters representing value into char_array starting at start

  void int_getChars(GraphKit& kit, Node* value, Node* char_array, Node* start, Node* end);

  // Copy of the contents of the String str into char_array starting at index start.

  Node* copy_string(GraphKit& kit, Node* str, Node* char_array, Node* start);

  // Clean up any leftover nodes

  void record_dead_node(Node* node);

  void remove_dead_nodes();

  PhaseGVN* gvn() { return _gvn; }

  enum {

    // max length of constant string copy unrolling in copy_string

    unroll_string_copy_length = 6

  };

 public:

  PhaseStringOpts(PhaseGVN* gvn, Unique_Node_List* worklist);

};