--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/opto/stringopts.hpp Thu Nov 12 09:24:21 2009 -0800
@@ -0,0 +1,83 @@
+/*
+ * 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);
+};