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comparison src/share/vm/opto/stringopts.hpp @ 1080:7c57aead6d3e

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6892658: C2 should optimize some stringbuilder patterns Reviewed-by: kvn, twisti
author never
date Thu, 12 Nov 2009 09:24:21 -0800
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children c18cbe5936b8
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1078:8e7adf982378 1080:7c57aead6d3e
1 /*
2 * Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class StringConcat;
26
27 class PhaseStringOpts : public Phase {
28 friend class StringConcat;
29
30 private:
31 PhaseGVN* _gvn;
32
33 // List of dead nodes to clean up aggressively at the end
34 Unique_Node_List dead_worklist;
35
36 // Memory slices needed for code gen
37 int char_adr_idx;
38 int value_field_idx;
39 int count_field_idx;
40 int offset_field_idx;
41
42 // Integer.sizeTable - used for int to String conversion
43 ciField* size_table_field;
44
45 // A set for use by various stages
46 VectorSet _visited;
47
48 // Collect a list of all SB.toString calls
49 Node_List collect_toString_calls();
50
51 // Examine the use of the SB alloc to see if it can be replace with
52 // a single string construction.
53 StringConcat* build_candidate(CallStaticJavaNode* call);
54
55 // Replace all the SB calls in concat with an optimization String allocation
56 void replace_string_concat(StringConcat* concat);
57
58 // Load the value of a static field, performing any constant folding.
59 Node* fetch_static_field(GraphKit& kit, ciField* field);
60
61 // Compute the number of characters required to represent the int value
62 Node* int_stringSize(GraphKit& kit, Node* value);
63
64 // Copy the characters representing value into char_array starting at start
65 void int_getChars(GraphKit& kit, Node* value, Node* char_array, Node* start, Node* end);
66
67 // Copy of the contents of the String str into char_array starting at index start.
68 Node* copy_string(GraphKit& kit, Node* str, Node* char_array, Node* start);
69
70 // Clean up any leftover nodes
71 void record_dead_node(Node* node);
72 void remove_dead_nodes();
73
74 PhaseGVN* gvn() { return _gvn; }
75
76 enum {
77 // max length of constant string copy unrolling in copy_string
78 unroll_string_copy_length = 6
79 };
80
81 public:
82 PhaseStringOpts(PhaseGVN* gvn, Unique_Node_List* worklist);
83 };