Mercurial > hg > truffle
annotate src/share/vm/classfile/classFileStream.hpp @ 2236:de14f1eee390
6954420: 2/4 jps shows "process information unavailable" sometimes
Summary: Make sure the backing store file is flushed in create_sharedmem_resources() and get_user_name_slow() no longer checks the size of the backing store file.
Reviewed-by: briand, swamyv, acorn, poonam
author | dcubed |
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date | Tue, 15 Feb 2011 19:00:22 -0800 |
parents | b92c45f2bc75 |
children | 1d1603768966 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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_CLASSFILE_CLASSFILESTREAM_HPP |
26 #define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP | |
27 | |
28 #include "utilities/top.hpp" | |
29 #ifdef TARGET_ARCH_x86 | |
30 # include "bytes_x86.hpp" | |
31 #endif | |
32 #ifdef TARGET_ARCH_sparc | |
33 # include "bytes_sparc.hpp" | |
34 #endif | |
35 #ifdef TARGET_ARCH_zero | |
36 # include "bytes_zero.hpp" | |
37 #endif | |
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38 #ifdef TARGET_ARCH_arm |
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39 # include "bytes_arm.hpp" |
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40 #endif |
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41 #ifdef TARGET_ARCH_ppc |
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42 # include "bytes_ppc.hpp" |
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43 #endif |
1972 | 44 |
0 | 45 // Input stream for reading .class file |
46 // | |
47 // The entire input stream is present in a buffer allocated by the caller. | |
48 // The caller is responsible for deallocating the buffer and for using | |
49 // ResourceMarks appropriately when constructing streams. | |
50 | |
51 class ClassFileStream: public ResourceObj { | |
52 private: | |
53 u1* _buffer_start; // Buffer bottom | |
54 u1* _buffer_end; // Buffer top (one past last element) | |
55 u1* _current; // Current buffer position | |
56 char* _source; // Source of stream (directory name, ZIP/JAR archive name) | |
57 bool _need_verify; // True if verification is on for the class file | |
58 | |
59 void truncated_file_error(TRAPS); | |
60 public: | |
61 // Constructor | |
62 ClassFileStream(u1* buffer, int length, char* source); | |
63 | |
64 // Buffer access | |
65 u1* buffer() const { return _buffer_start; } | |
66 int length() const { return _buffer_end - _buffer_start; } | |
67 u1* current() const { return _current; } | |
68 void set_current(u1* pos) { _current = pos; } | |
69 char* source() const { return _source; } | |
70 void set_verify(bool flag) { _need_verify = flag; } | |
71 | |
72 void check_truncated_file(bool b, TRAPS) { | |
73 if (b) { | |
74 truncated_file_error(THREAD); | |
75 } | |
76 } | |
77 | |
78 void guarantee_more(int size, TRAPS) { | |
79 size_t remaining = (size_t)(_buffer_end - _current); | |
80 unsigned int usize = (unsigned int)size; | |
81 check_truncated_file(usize > remaining, CHECK); | |
82 } | |
83 | |
84 // Read u1 from stream | |
85 u1 get_u1(TRAPS); | |
86 u1 get_u1_fast() { | |
87 return *_current++; | |
88 } | |
89 | |
90 // Read u2 from stream | |
91 u2 get_u2(TRAPS); | |
92 u2 get_u2_fast() { | |
93 u2 res = Bytes::get_Java_u2(_current); | |
94 _current += 2; | |
95 return res; | |
96 } | |
97 | |
98 // Read u4 from stream | |
99 u4 get_u4(TRAPS); | |
100 u4 get_u4_fast() { | |
101 u4 res = Bytes::get_Java_u4(_current); | |
102 _current += 4; | |
103 return res; | |
104 } | |
105 | |
106 // Read u8 from stream | |
107 u8 get_u8(TRAPS); | |
108 u8 get_u8_fast() { | |
109 u8 res = Bytes::get_Java_u8(_current); | |
110 _current += 8; | |
111 return res; | |
112 } | |
113 | |
114 // Get direct pointer into stream at current position. | |
115 // Returns NULL if length elements are not remaining. The caller is | |
116 // responsible for calling skip below if buffer contents is used. | |
117 u1* get_u1_buffer() { | |
118 return _current; | |
119 } | |
120 | |
121 u2* get_u2_buffer() { | |
122 return (u2*) _current; | |
123 } | |
124 | |
125 // Skip length u1 or u2 elements from stream | |
126 void skip_u1(int length, TRAPS); | |
127 void skip_u1_fast(int length) { | |
128 _current += length; | |
129 } | |
130 | |
131 void skip_u2(int length, TRAPS); | |
132 void skip_u2_fast(int length) { | |
133 _current += 2 * length; | |
134 } | |
135 | |
136 // Tells whether eos is reached | |
137 bool at_eos() const { return _current == _buffer_end; } | |
138 }; | |
1972 | 139 |
140 #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP |