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comparison src/share/vm/classfile/classFileStream.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2005 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 // Input stream for reading .class file
26 //
27 // The entire input stream is present in a buffer allocated by the caller.
28 // The caller is responsible for deallocating the buffer and for using
29 // ResourceMarks appropriately when constructing streams.
30
31 class ClassFileStream: public ResourceObj {
32 private:
33 u1* _buffer_start; // Buffer bottom
34 u1* _buffer_end; // Buffer top (one past last element)
35 u1* _current; // Current buffer position
36 char* _source; // Source of stream (directory name, ZIP/JAR archive name)
37 bool _need_verify; // True if verification is on for the class file
38
39 void truncated_file_error(TRAPS);
40 public:
41 // Constructor
42 ClassFileStream(u1* buffer, int length, char* source);
43
44 // Buffer access
45 u1* buffer() const { return _buffer_start; }
46 int length() const { return _buffer_end - _buffer_start; }
47 u1* current() const { return _current; }
48 void set_current(u1* pos) { _current = pos; }
49 char* source() const { return _source; }
50 void set_verify(bool flag) { _need_verify = flag; }
51
52 void check_truncated_file(bool b, TRAPS) {
53 if (b) {
54 truncated_file_error(THREAD);
55 }
56 }
57
58 void guarantee_more(int size, TRAPS) {
59 size_t remaining = (size_t)(_buffer_end - _current);
60 unsigned int usize = (unsigned int)size;
61 check_truncated_file(usize > remaining, CHECK);
62 }
63
64 // Read u1 from stream
65 u1 get_u1(TRAPS);
66 u1 get_u1_fast() {
67 return *_current++;
68 }
69
70 // Read u2 from stream
71 u2 get_u2(TRAPS);
72 u2 get_u2_fast() {
73 u2 res = Bytes::get_Java_u2(_current);
74 _current += 2;
75 return res;
76 }
77
78 // Read u4 from stream
79 u4 get_u4(TRAPS);
80 u4 get_u4_fast() {
81 u4 res = Bytes::get_Java_u4(_current);
82 _current += 4;
83 return res;
84 }
85
86 // Read u8 from stream
87 u8 get_u8(TRAPS);
88 u8 get_u8_fast() {
89 u8 res = Bytes::get_Java_u8(_current);
90 _current += 8;
91 return res;
92 }
93
94 // Get direct pointer into stream at current position.
95 // Returns NULL if length elements are not remaining. The caller is
96 // responsible for calling skip below if buffer contents is used.
97 u1* get_u1_buffer() {
98 return _current;
99 }
100
101 u2* get_u2_buffer() {
102 return (u2*) _current;
103 }
104
105 // Skip length u1 or u2 elements from stream
106 void skip_u1(int length, TRAPS);
107 void skip_u1_fast(int length) {
108 _current += length;
109 }
110
111 void skip_u2(int length, TRAPS);
112 void skip_u2_fast(int length) {
113 _current += 2 * length;
114 }
115
116 // Tells whether eos is reached
117 bool at_eos() const { return _current == _buffer_end; }
118 };