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comparison: src/share/vm/classfile/classFileStream.hpp
src/share/vm/classfile/classFileStream.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2013, 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 */ | |
| 24 | |
| 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 | |
| 38 #ifdef TARGET_ARCH_arm | |
| 39 # include "bytes_arm.hpp" | |
| 40 #endif | |
| 41 #ifdef TARGET_ARCH_ppc | |
| 42 # include "bytes_ppc.hpp" | |
| 43 #endif | |
| 44 | |
| 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 void skip_u4(int length, TRAPS); | |
| 137 void skip_u4_fast(int length) { | |
| 138 _current += 4 * length; | |
| 139 } | |
| 140 | |
| 141 // Tells whether eos is reached | |
| 142 bool at_eos() const { return _current == _buffer_end; } | |
| 143 }; | |
| 144 | |
| 145 #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP |
