Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/classFileStream.hpp@01522ca68fc7 (annotated)

src/share/vm/classfile/classFileStream.hpp

Tue, 18 Jun 2013 12:31:07 -0700

author
johnc
date
Tue, 18 Jun 2013 12:31:07 -0700
changeset 5277
01522ca68fc7
parent 4398
ade95d680b42
child 6198
55fb97c4c58d
permissions
-rw-r--r--

8015237: Parallelize string table scanning during strong root processing
Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti

duke@435 1 /*
trims@2708 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #ifndef SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
stefank@2314 26 #define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP
stefank@2314 27
stefank@2314 28 #include "utilities/top.hpp"
stefank@2314 29 #ifdef TARGET_ARCH_x86
stefank@2314 30 # include "bytes_x86.hpp"
stefank@2314 31 #endif
stefank@2314 32 #ifdef TARGET_ARCH_sparc
stefank@2314 33 # include "bytes_sparc.hpp"
stefank@2314 34 #endif
stefank@2314 35 #ifdef TARGET_ARCH_zero
stefank@2314 36 # include "bytes_zero.hpp"
stefank@2314 37 #endif
bobv@2508 38 #ifdef TARGET_ARCH_arm
bobv@2508 39 # include "bytes_arm.hpp"
bobv@2508 40 #endif
bobv@2508 41 #ifdef TARGET_ARCH_ppc
bobv@2508 42 # include "bytes_ppc.hpp"
bobv@2508 43 #endif
stefank@2314 44
duke@435 45 // Input stream for reading .class file
duke@435 46 //
duke@435 47 // The entire input stream is present in a buffer allocated by the caller.
duke@435 48 // The caller is responsible for deallocating the buffer and for using
duke@435 49 // ResourceMarks appropriately when constructing streams.
duke@435 50
duke@435 51 class ClassFileStream: public ResourceObj {
duke@435 52 private:
duke@435 53 u1* _buffer_start; // Buffer bottom
duke@435 54 u1* _buffer_end; // Buffer top (one past last element)
duke@435 55 u1* _current; // Current buffer position
duke@435 56 char* _source; // Source of stream (directory name, ZIP/JAR archive name)
duke@435 57 bool _need_verify; // True if verification is on for the class file
duke@435 58
duke@435 59 void truncated_file_error(TRAPS);
duke@435 60 public:
duke@435 61 // Constructor
duke@435 62 ClassFileStream(u1* buffer, int length, char* source);
duke@435 63
duke@435 64 // Buffer access
duke@435 65 u1* buffer() const { return _buffer_start; }
duke@435 66 int length() const { return _buffer_end - _buffer_start; }
duke@435 67 u1* current() const { return _current; }
duke@435 68 void set_current(u1* pos) { _current = pos; }
duke@435 69 char* source() const { return _source; }
duke@435 70 void set_verify(bool flag) { _need_verify = flag; }
duke@435 71
duke@435 72 void check_truncated_file(bool b, TRAPS) {
duke@435 73 if (b) {
duke@435 74 truncated_file_error(THREAD);
duke@435 75 }
duke@435 76 }
duke@435 77
duke@435 78 void guarantee_more(int size, TRAPS) {
duke@435 79 size_t remaining = (size_t)(_buffer_end - _current);
duke@435 80 unsigned int usize = (unsigned int)size;
duke@435 81 check_truncated_file(usize > remaining, CHECK);
duke@435 82 }
duke@435 83
duke@435 84 // Read u1 from stream
duke@435 85 u1 get_u1(TRAPS);
duke@435 86 u1 get_u1_fast() {
duke@435 87 return *_current++;
duke@435 88 }
duke@435 89
duke@435 90 // Read u2 from stream
duke@435 91 u2 get_u2(TRAPS);
duke@435 92 u2 get_u2_fast() {
duke@435 93 u2 res = Bytes::get_Java_u2(_current);
duke@435 94 _current += 2;
duke@435 95 return res;
duke@435 96 }
duke@435 97
duke@435 98 // Read u4 from stream
duke@435 99 u4 get_u4(TRAPS);
duke@435 100 u4 get_u4_fast() {
duke@435 101 u4 res = Bytes::get_Java_u4(_current);
duke@435 102 _current += 4;
duke@435 103 return res;
duke@435 104 }
duke@435 105
duke@435 106 // Read u8 from stream
duke@435 107 u8 get_u8(TRAPS);
duke@435 108 u8 get_u8_fast() {
duke@435 109 u8 res = Bytes::get_Java_u8(_current);
duke@435 110 _current += 8;
duke@435 111 return res;
duke@435 112 }
duke@435 113
duke@435 114 // Get direct pointer into stream at current position.
duke@435 115 // Returns NULL if length elements are not remaining. The caller is
duke@435 116 // responsible for calling skip below if buffer contents is used.
duke@435 117 u1* get_u1_buffer() {
duke@435 118 return _current;
duke@435 119 }
duke@435 120
duke@435 121 u2* get_u2_buffer() {
duke@435 122 return (u2*) _current;
duke@435 123 }
duke@435 124
duke@435 125 // Skip length u1 or u2 elements from stream
duke@435 126 void skip_u1(int length, TRAPS);
duke@435 127 void skip_u1_fast(int length) {
duke@435 128 _current += length;
duke@435 129 }
duke@435 130
duke@435 131 void skip_u2(int length, TRAPS);
duke@435 132 void skip_u2_fast(int length) {
duke@435 133 _current += 2 * length;
duke@435 134 }
duke@435 135
coleenp@4398 136 void skip_u4(int length, TRAPS);
coleenp@4398 137 void skip_u4_fast(int length) {
coleenp@4398 138 _current += 4 * length;
coleenp@4398 139 }
coleenp@4398 140
duke@435 141 // Tells whether eos is reached
duke@435 142 bool at_eos() const { return _current == _buffer_end; }
duke@435 143 };
stefank@2314 144
stefank@2314 145 #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP

Mercurial Repository: jdk8-mips64-public/hotspot

mercurial