Mercurial > hg > graal-compiler
comparison src/share/vm/opto/stringopts.hpp @ 1080:7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 12 Nov 2009 09:24:21 -0800 |
parents | |
children | c18cbe5936b8 |
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1078:8e7adf982378 | 1080:7c57aead6d3e |
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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 }; |