Mercurial > hg > truffle
annotate src/share/vm/utilities/xmlstream.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 78bbf4d43a14 |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2002, 2014, 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_UTILITIES_XMLSTREAM_HPP |
| 26 #define SHARE_VM_UTILITIES_XMLSTREAM_HPP | |
| 27 | |
| 28 #include "runtime/handles.hpp" | |
| 29 #include "utilities/ostream.hpp" | |
| 30 | |
| 0 | 31 class xmlStream; |
| 32 class defaultStream; | |
| 33 | |
| 34 // Sub-stream for writing quoted text, as opposed to markup. | |
| 35 // Characters written to this stream are subject to quoting, | |
| 36 // as '<' => "<", etc. | |
| 37 class xmlTextStream : public outputStream { | |
| 38 friend class xmlStream; | |
| 39 friend class defaultStream; // tty | |
| 40 private: | |
| 41 | |
| 42 xmlStream* _outer_xmlStream; | |
| 43 | |
| 44 xmlTextStream() { _outer_xmlStream = NULL; } | |
| 45 | |
| 46 public: | |
| 47 virtual void flush(); // _outer.flush(); | |
| 48 virtual void write(const char* str, size_t len); // _outer->write_text() | |
| 49 }; | |
| 50 | |
| 51 | |
| 52 // Output stream for writing XML-structured logs. | |
| 53 // To write markup, use special calls elem, head/tail, etc. | |
| 54 // Use the xmlStream::text() stream to write unmarked text. | |
| 55 // Text written that way will be quoted as necessary using '<', etc. | |
| 56 // Characters written directly to an xmlStream via print_cr, etc., | |
| 57 // are directly written to the encapsulated stream, xmlStream::out(). | |
| 58 // This can be used to produce markup directly, character by character. | |
| 59 // (Such writes are not checked for markup syntax errors.) | |
| 60 | |
| 61 class xmlStream : public outputStream { | |
| 62 friend class defaultStream; // tty | |
| 63 public: | |
| 64 enum MarkupState { BODY, // after end_head() call, in text | |
| 65 HEAD, // after begin_head() call, in attrs | |
| 66 ELEM }; // after begin_elem() call, in attrs | |
| 67 | |
| 68 protected: | |
| 69 outputStream* _out; // file stream by which it goes | |
| 70 julong _last_flush; // last position of flush | |
| 71 MarkupState _markup_state; // where in the elem/head/tail dance | |
| 72 outputStream* _text; // text stream | |
| 73 xmlTextStream _text_init; | |
| 74 | |
| 75 // for subclasses | |
| 76 xmlStream() {} | |
| 77 void initialize(outputStream* out); | |
| 78 | |
| 79 // protect this from public use: | |
| 80 outputStream* out() { return _out; } | |
| 81 | |
| 82 // helpers for writing XML elements | |
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83 void va_tag(bool push, const char* format, va_list ap) ATTRIBUTE_PRINTF(3, 0); |
| 0 | 84 virtual void see_tag(const char* tag, bool push) NOT_DEBUG({}); |
| 85 virtual void pop_tag(const char* tag) NOT_DEBUG({}); | |
| 86 | |
| 87 #ifdef ASSERT | |
| 88 // in debug mode, we verify matching of opening and closing tags | |
| 89 int _element_depth; // number of unfinished elements | |
| 90 char* _element_close_stack_high; // upper limit of down-growing stack | |
| 91 char* _element_close_stack_low; // upper limit of down-growing stack | |
| 92 char* _element_close_stack_ptr; // pointer of down-growing stack | |
| 93 #endif | |
| 94 | |
| 95 public: | |
| 96 // creation | |
| 97 xmlStream(outputStream* out) { initialize(out); } | |
| 98 DEBUG_ONLY(virtual ~xmlStream();) | |
| 99 | |
| 100 bool is_open() { return _out != NULL; } | |
| 101 | |
| 102 // text output | |
| 103 bool inside_attrs() { return _markup_state != BODY; } | |
| 104 | |
| 105 // flushing | |
| 106 virtual void flush(); // flushes out, sets _last_flush = count() | |
| 107 virtual void write(const char* s, size_t len); | |
| 108 void write_text(const char* s, size_t len); // used by xmlTextStream | |
| 109 int unflushed_count() { return (int)(out()->count() - _last_flush); } | |
| 110 | |
| 111 // writing complete XML elements | |
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112 void elem(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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113 void begin_elem(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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114 void end_elem(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
| 0 | 115 void end_elem(); |
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116 void head(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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117 void begin_head(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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118 void end_head(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
| 0 | 119 void end_head(); |
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120 void done(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); // xxx_done event, plus tail |
| 0 | 121 void done_raw(const char * kind); |
| 122 void tail(const char* kind); | |
| 123 | |
| 124 // va_list versions | |
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125 void va_elem(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0); |
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126 void va_begin_elem(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0); |
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127 void va_head(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0); |
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128 void va_begin_head(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0); |
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129 void va_done(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0); |
| 0 | 130 |
| 131 // write text (with quoting of special XML characters <>&'" etc.) | |
| 132 outputStream* text() { return _text; } | |
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133 void text(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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134 void va_text(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0) { |
| 0 | 135 text()->vprint(format, ap); |
| 136 } | |
| 137 | |
| 138 // commonly used XML attributes | |
| 139 void stamp(); // stamp='1.234' | |
| 140 void method(methodHandle m); // method='k n s' ... | |
| 141 void klass(KlassHandle k); // klass='name' | |
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142 void name(const Symbol* s); // name='name' |
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143 void object(const char* attr, Metadata* val); |
| 0 | 144 void object(const char* attr, Handle val); |
| 145 | |
| 146 // print the text alone (sans ''): | |
| 147 void method_text(methodHandle m); | |
| 148 void klass_text(KlassHandle k); // klass='name' | |
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149 void name_text(const Symbol* s); // name='name' |
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150 void object_text(Metadata* x); |
| 0 | 151 void object_text(Handle x); |
| 152 | |
| 153 /* Example uses: | |
| 154 | |
| 155 // Empty element, simple case. | |
| 156 elem("X Y='Z'"); <X Y='Z'/> \n | |
| 157 | |
| 158 // Empty element, general case. | |
| 159 begin_elem("X Y='Z'"); <X Y='Z' | |
| 160 ...attrs... ...attrs... | |
| 161 end_elem(); /> | |
| 162 | |
| 163 // Compound element, simple case. | |
| 164 head("X Y='Z'"); <X Y='Z'> \n | |
| 165 ...body... ...body... | |
| 166 tail("X"); </X> \n | |
| 167 | |
| 168 // Compound element, general case. | |
| 169 begin_head("X Y='Z'"); <X Y='Z' | |
| 170 ...attrs... ...attrs... | |
| 171 end_head(); > \n | |
| 172 ...body... ...body... | |
| 173 tail("X"); </X> \n | |
| 174 | |
| 175 // Printf-style formatting: | |
| 176 elem("X Y='%s'", "Z"); <X Y='Z'/> \n | |
| 177 | |
| 178 */ | |
| 179 | |
| 180 }; | |
| 181 | |
| 182 // Standard log file, null if no logging is happening. | |
| 183 extern xmlStream* xtty; | |
| 184 | |
| 185 // Note: If ::xtty != NULL, ::tty == ::xtty->text(). | |
| 1972 | 186 |
| 187 #endif // SHARE_VM_UTILITIES_XMLSTREAM_HPP |