Mercurial > hg > graal-compiler
comparison src/share/vm/classfile/classFileStream.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 }; |