Thu, 24 May 2018 18:41:44 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
32 #define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
34 #include "utilities/top.hpp"
35 #ifdef TARGET_ARCH_x86
36 # include "bytes_x86.hpp"
37 #endif
38 #ifdef TARGET_ARCH_mips
39 # include "bytes_mips.hpp"
40 #endif
41 #ifdef TARGET_ARCH_sparc
42 # include "bytes_sparc.hpp"
43 #endif
44 #ifdef TARGET_ARCH_zero
45 # include "bytes_zero.hpp"
46 #endif
47 #ifdef TARGET_ARCH_arm
48 # include "bytes_arm.hpp"
49 #endif
50 #ifdef TARGET_ARCH_ppc
51 # include "bytes_ppc.hpp"
52 #endif
54 // Input stream for reading .class file
55 //
56 // The entire input stream is present in a buffer allocated by the caller.
57 // The caller is responsible for deallocating the buffer and for using
58 // ResourceMarks appropriately when constructing streams.
60 class ClassFileStream: public ResourceObj {
61 private:
62 u1* _buffer_start; // Buffer bottom
63 u1* _buffer_end; // Buffer top (one past last element)
64 u1* _current; // Current buffer position
65 const char* _source; // Source of stream (directory name, ZIP/JAR archive name)
66 bool _need_verify; // True if verification is on for the class file
68 void truncated_file_error(TRAPS);
69 public:
70 // Constructor
71 ClassFileStream(u1* buffer, int length, const char* source);
73 // Buffer access
74 u1* buffer() const { return _buffer_start; }
75 int length() const { return _buffer_end - _buffer_start; }
76 u1* current() const { return _current; }
77 void set_current(u1* pos) { _current = pos; }
78 const char* source() const { return _source; }
79 void set_verify(bool flag) { _need_verify = flag; }
81 void check_truncated_file(bool b, TRAPS) {
82 if (b) {
83 truncated_file_error(THREAD);
84 }
85 }
87 void guarantee_more(int size, TRAPS) {
88 size_t remaining = (size_t)(_buffer_end - _current);
89 unsigned int usize = (unsigned int)size;
90 check_truncated_file(usize > remaining, CHECK);
91 }
93 // Read u1 from stream
94 u1 get_u1(TRAPS);
95 u1 get_u1_fast() {
96 return *_current++;
97 }
99 // Read u2 from stream
100 u2 get_u2(TRAPS);
101 u2 get_u2_fast() {
102 u2 res = Bytes::get_Java_u2(_current);
103 _current += 2;
104 return res;
105 }
107 // Read u4 from stream
108 u4 get_u4(TRAPS);
109 u4 get_u4_fast() {
110 u4 res = Bytes::get_Java_u4(_current);
111 _current += 4;
112 return res;
113 }
115 // Read u8 from stream
116 u8 get_u8(TRAPS);
117 u8 get_u8_fast() {
118 u8 res = Bytes::get_Java_u8(_current);
119 _current += 8;
120 return res;
121 }
123 // Get direct pointer into stream at current position.
124 // Returns NULL if length elements are not remaining. The caller is
125 // responsible for calling skip below if buffer contents is used.
126 u1* get_u1_buffer() {
127 return _current;
128 }
130 u2* get_u2_buffer() {
131 return (u2*) _current;
132 }
134 // Skip length u1 or u2 elements from stream
135 void skip_u1(int length, TRAPS);
136 void skip_u1_fast(int length) {
137 _current += length;
138 }
140 void skip_u2(int length, TRAPS);
141 void skip_u2_fast(int length) {
142 _current += 2 * length;
143 }
145 void skip_u4(int length, TRAPS);
146 void skip_u4_fast(int length) {
147 _current += 4 * length;
148 }
150 // Tells whether eos is reached
151 bool at_eos() const { return _current == _buffer_end; }
152 };
154 #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP