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annotate src/share/vm/utilities/globalDefinitions_xlc.hpp @ 20543:e7d0505c8a30

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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 b6a8cc1e0d92
children
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14415
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1 /*
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2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_XLC_HPP
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27 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_XLC_HPP
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28
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29 #include "prims/jni.h"
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30
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31 // This file holds compiler-dependent includes,
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32 // globally used constants & types, class (forward)
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33 // declarations and a few frequently used utility functions.
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34
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35 #include <ctype.h>
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36 #include <string.h>
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37 #include <stdarg.h>
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38 #include <stddef.h>
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39 #include <stdio.h>
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40 #include <stdlib.h>
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41 #include <wchar.h>
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42
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43 #include <math.h>
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44 #ifndef FP_PZERO
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45 // Linux doesn't have positive/negative zero
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46 #define FP_PZERO FP_ZERO
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47 #endif
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48 #if (!defined fpclass)
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49 #define fpclass fpclassify
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50 #endif
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51
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52 #include <time.h>
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53 #include <fcntl.h>
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54 #include <dlfcn.h>
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55 #include <pthread.h>
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56
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57 #include <limits.h>
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58 #include <errno.h>
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59
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60 #include <stdint.h>
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61
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62 // Use XLC compiler builtins instead of inline assembler
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63 #define USE_XLC_BUILTINS
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64 #ifdef USE_XLC_BUILTINS
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65 #include <builtins.h>
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66 #if __IBMCPP__ < 1000
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67 // the funtion prototype for __dcbtst(void *) is missing in XLC V8.0
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68 // I could compile a little test, where I provided the prototype.
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69 // The generated code was correct there. This is the prototype:
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70 // extern "builtin" void __dcbtst (void *);
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71 // For now we don't make use of it when compiling with XLC V8.0
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72 #else
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73 // __IBMCPP__ >= 1000
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74 // XLC V10 provides the prototype for __dcbtst (void *);
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75 #define USE_XLC_PREFETCH_WRITE_BUILTIN
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76 #endif
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77 #endif // USE_XLC_BUILTINS
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78
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79 // NULL vs NULL_WORD:
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80 // On Linux NULL is defined as a special type '__null'. Assigning __null to
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81 // integer variable will cause gcc warning. Use NULL_WORD in places where a
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82 // pointer is stored as integer value. On some platforms, sizeof(intptr_t) >
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83 // sizeof(void*), so here we want something which is integer type, but has the
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84 // same size as a pointer.
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85 #ifdef __GNUC__
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86 #error XLC and __GNUC__?
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87 #else
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88 #define NULL_WORD NULL
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89 #endif
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90
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91 // AIX also needs a 64 bit NULL to work as a null address pointer.
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92 // Most system includes on AIX would define it as an int 0 if not already defined with one
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93 // exception: /usr/include/dirent.h will unconditionally redefine NULL to int 0 again.
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94 // In this case you need to copy the following defines to a position after #include <dirent.h>
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95 // (see jmv_aix.h).
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96 #ifdef AIX
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97 #ifdef _LP64
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98 #undef NULL
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99 #define NULL 0L
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100 #else
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101 #ifndef NULL
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102 #define NULL 0
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103 #endif
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104 #endif
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105 #endif // AIX
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106
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107 // Compiler-specific primitive types
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108 // All defs of int (uint16_6 etc) are defined in AIX' /usr/include/stdint.h
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109
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110 // Additional Java basic types
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111
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112 typedef uint8_t jubyte;
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113 typedef uint16_t jushort;
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114 typedef uint32_t juint;
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115 typedef uint64_t julong;
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116
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117
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118 //----------------------------------------------------------------------------------------------------
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119 // Constant for jlong (specifying an long long canstant is C++ compiler specific)
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120
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121 // Build a 64bit integer constant
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122 #define CONST64(x) (x ## LL)
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123 #define UCONST64(x) (x ## ULL)
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124
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125 const jlong min_jlong = CONST64(0x8000000000000000);
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126 const jlong max_jlong = CONST64(0x7fffffffffffffff);
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127
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128 //----------------------------------------------------------------------------------------------------
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129 // Debugging
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130
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131 #define DEBUG_EXCEPTION ::abort();
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132
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133 extern "C" void breakpoint();
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134 #define BREAKPOINT ::breakpoint()
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135
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136 // checking for nanness
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137 #ifdef AIX
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138 inline int g_isnan(float f) { return isnan(f); }
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139 inline int g_isnan(double f) { return isnan(f); }
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140 #else
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141 #error "missing platform-specific definition here"
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142 #endif
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143
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144 // Checking for finiteness
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145
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146 inline int g_isfinite(jfloat f) { return finite(f); }
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147 inline int g_isfinite(jdouble f) { return finite(f); }
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148
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149
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150 // Wide characters
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151
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152 inline int wcslen(const jchar* x) { return wcslen((const wchar_t*)x); }
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153
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154
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155 // Portability macros
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156 #define PRAGMA_INTERFACE #pragma interface
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157 #define PRAGMA_IMPLEMENTATION #pragma implementation
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158 #define VALUE_OBJ_CLASS_SPEC
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159
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160 // Formatting.
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161 #ifdef _LP64
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162 #define FORMAT64_MODIFIER "l"
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163 #else // !_LP64
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164 #define FORMAT64_MODIFIER "ll"
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165 #endif // _LP64
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166
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167 // Cannot use xlc's offsetof as implementation of hotspot's
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168 // offset_of(), because xlc warns about applying offsetof() to non-POD
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169 // object and xlc cannot compile the expression offsetof(DataLayout,
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170 // _cells[index]) in DataLayout::cell_offset() . Therefore we define
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171 // offset_of as it is defined for gcc.
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172 #define offset_of(klass,field) (size_t)((intx)&(((klass*)16)->field) - 16)
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173
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174 // Some constant sizes used throughout the AIX port
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175 #define SIZE_1K ((uint64_t) 0x400ULL)
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176 #define SIZE_4K ((uint64_t) 0x1000ULL)
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177 #define SIZE_64K ((uint64_t) 0x10000ULL)
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178 #define SIZE_1M ((uint64_t) 0x100000ULL)
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179 #define SIZE_4M ((uint64_t) 0x400000ULL)
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180 #define SIZE_8M ((uint64_t) 0x800000ULL)
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181 #define SIZE_16M ((uint64_t) 0x1000000ULL)
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182 #define SIZE_256M ((uint64_t) 0x10000000ULL)
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183 #define SIZE_1G ((uint64_t) 0x40000000ULL)
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184 #define SIZE_2G ((uint64_t) 0x80000000ULL)
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185 #define SIZE_4G ((uint64_t) 0x100000000ULL)
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186 #define SIZE_16G ((uint64_t) 0x400000000ULL)
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187 #define SIZE_32G ((uint64_t) 0x800000000ULL)
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188 #define SIZE_64G ((uint64_t) 0x1000000000ULL)
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189 #define SIZE_1T ((uint64_t) 0x10000000000ULL)
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190
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191
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192 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_XLC_HPP