Mercurial > hg > truffle
annotate src/share/vm/runtime/fieldType.hpp @ 10370:47bdfb3d010f
8015486: PSScavenge::is_obj_in_young is unnecessarily slow with UseCompressedOops
Summary: Compare compressed oops to a compressed young gen boundary instead of uncompressing the oops before doing the young gen boundary check.
Reviewed-by: brutisso, jmasa
author | stefank |
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date | Thu, 30 May 2013 10:58:16 +0200 |
parents | 1d1603768966 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP |
26 #define SHARE_VM_RUNTIME_FIELDTYPE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
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29 #include "oops/symbol.hpp" |
1972 | 30 |
0 | 31 // Note: FieldType should be based on the SignatureIterator (or vice versa). |
32 // In any case, this structure should be re-thought at some point. | |
33 | |
34 // A FieldType is used to determine the type of a field from a signature string. | |
35 | |
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36 // Information returned by get_array_info, which is scoped to decrement |
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37 // reference count if a Symbol is created in the case of T_OBJECT |
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38 class FieldArrayInfo : public StackObj { |
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39 friend class FieldType; // field type can set these fields. |
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40 int _dimension; |
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41 Symbol* _object_key; |
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42 public: |
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43 int dimension() { return _dimension; } |
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44 Symbol* object_key() { return _object_key; } |
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45 // basic constructor |
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46 FieldArrayInfo() : _dimension(0), _object_key(NULL) {} |
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47 // destructor decrements object key's refcount if created |
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48 ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); } |
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49 }; |
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50 |
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51 |
0 | 52 class FieldType: public AllStatic { |
53 private: | |
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54 static void skip_optional_size(Symbol* signature, int* index); |
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55 static bool is_valid_array_signature(Symbol* signature); |
0 | 56 public: |
57 | |
58 // Return basic type | |
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59 static BasicType basic_type(Symbol* signature); |
0 | 60 |
61 // Testing | |
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62 static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); } |
0 | 63 |
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64 static bool is_obj(Symbol* signature) { |
0 | 65 int sig_length = signature->utf8_length(); |
66 // Must start with 'L' and end with ';' | |
67 return (sig_length >= 2 && | |
68 (signature->byte_at(0) == 'L') && | |
69 (signature->byte_at(sig_length - 1) == ';')); | |
70 } | |
71 | |
72 // Parse field and extract array information. Works for T_ARRAY only. | |
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73 static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS); |
0 | 74 }; |
1972 | 75 |
76 #endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP |