Mercurial > hg > truffle
annotate src/share/vm/classfile/classFileStream.hpp @ 3762:5c0a3c1858b1
7048782: CMS: assert(last_chunk_index_to_check<= last_chunk_index) failed: parCardTableModRefBS.cpp:359
Summary: The LNC array is sized before the start of a scavenge, while the heap may expand during a scavenge. With CMS, the last block of an arbitrary suffice of the LNC array may expand due to coalition with the expansion delta. We now take care not to attempt access past the end of the LNC array. LNC array code will be cleaned up and suitably encapsulated as part of the forthcoming performance RFE 7043675.
Reviewed-by: brutisso
| author | ysr |
|---|---|
| date | Thu, 02 Jun 2011 10:23:36 -0700 |
| parents | 1d1603768966 |
| children | ade95d680b42 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 |