Mercurial > hg > truffle
diff src/share/vm/opto/stringopts.hpp @ 1080:7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
Reviewed-by: kvn, twisti
author | never |
---|---|
date | Thu, 12 Nov 2009 09:24:21 -0800 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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); +};