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annotate src/share/vm/prims/whitebox.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 5a1f452f8f90
children 4102b59539ce db9981fd3124
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26
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27 #include "memory/universe.hpp"
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28 #include "oops/oop.inline.hpp"
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29
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30 #include "classfile/symbolTable.hpp"
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31 #include "classfile/classLoaderData.hpp"
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32
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33 #include "prims/whitebox.hpp"
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34 #include "prims/wbtestmethods/parserTests.hpp"
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35
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36 #include "runtime/interfaceSupport.hpp"
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37 #include "runtime/os.hpp"
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38 #include "utilities/debug.hpp"
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39
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40 #ifndef SERIALGC
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41 #include "gc_implementation/g1/concurrentMark.hpp"
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42 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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43 #include "gc_implementation/g1/heapRegionRemSet.hpp"
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44 #endif // !SERIALGC
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45
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46 bool WhiteBox::_used = false;
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47
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48 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
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49 return (jlong)(void*)JNIHandles::resolve(obj);
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50 WB_END
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51
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52 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
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53 return heapOopSize;
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54 WB_END
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55
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56
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57 class WBIsKlassAliveClosure : public KlassClosure {
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58 Symbol* _name;
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59 bool _found;
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60 public:
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61 WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
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62
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63 void do_klass(Klass* k) {
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64 if (_found) return;
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65 Symbol* ksym = k->name();
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66 if (ksym->fast_compare(_name) == 0) {
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67 _found = true;
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68 }
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69 }
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70
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71 bool found() const {
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72 return _found;
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73 }
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74 };
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75
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76 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
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77 Handle h_name = JNIHandles::resolve(name);
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78 if (h_name.is_null()) return false;
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79 Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
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80 TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
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81
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82 WBIsKlassAliveClosure closure(sym);
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83 ClassLoaderDataGraph::classes_do(&closure);
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84
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85 return closure.found();
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86 WB_END
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87
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88 #ifndef SERIALGC
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89 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
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90 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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91 oop result = JNIHandles::resolve(obj);
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92 const HeapRegion* hr = g1->heap_region_containing(result);
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93 return hr->isHumongous();
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94 WB_END
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95
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96 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
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97 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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98 size_t nr = g1->free_regions();
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99 return (jlong)nr;
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100 WB_END
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101
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102 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
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103 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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104 ConcurrentMark* cm = g1->concurrent_mark();
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105 return cm->concurrent_marking_in_progress();
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106 WB_END
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107
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108 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
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109 return (jint)HeapRegion::GrainBytes;
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110 WB_END
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111 #endif // !SERIALGC
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112
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113 //Some convenience methods to deal with objects from java
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114 int WhiteBox::offset_for_field(const char* field_name, oop object,
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115 Symbol* signature_symbol) {
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116 assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
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117 Thread* THREAD = Thread::current();
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118
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119 //Get the class of our object
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120 Klass* arg_klass = object->klass();
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121 //Turn it into an instance-klass
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122 InstanceKlass* ik = InstanceKlass::cast(arg_klass);
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123
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124 //Create symbols to look for in the class
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125 TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
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126 THREAD);
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127
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128 //To be filled in with an offset of the field we're looking for
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129 fieldDescriptor fd;
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130
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131 Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
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132 if (res == NULL) {
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133 tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
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134 name_symbol->as_C_string());
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135 fatal("Invalid layout of preloaded class");
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136 }
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137
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138 //fetch the field at the offset we've found
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139 int dest_offset = fd.offset();
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140
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141 return dest_offset;
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142 }
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143
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144
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145 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
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146 int offset = offset_for_field(field_name, object,
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147 vmSymbols::string_signature());
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148 oop string = object->obj_field(offset);
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149 if (string == NULL) {
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150 return NULL;
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151 }
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152 const char* ret = java_lang_String::as_utf8_string(string);
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153 return ret;
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154 }
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155
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156 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
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157 int offset =
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158 offset_for_field(field_name, object, vmSymbols::bool_signature());
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159 bool ret = (object->bool_field(offset) == JNI_TRUE);
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160 return ret;
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161 }
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162
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163
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164 #define CC (char*)
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165
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166 static JNINativeMethod methods[] = {
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167 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
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168 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
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169 {CC"isClassAlive0", CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive },
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170 {CC "parseCommandLine",
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171 CC "(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
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172 (void*) &WB_ParseCommandLine
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173 },
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174 #ifndef SERIALGC
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175 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
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176 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous },
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177 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
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178 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },
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179 #endif // !SERIALGC
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180 };
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181
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182 #undef CC
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183
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184 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
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185 {
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186 if (WhiteBoxAPI) {
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187 // Make sure that wbclass is loaded by the null classloader
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188 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
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189 Handle loader(ikh->class_loader());
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190 if (loader.is_null()) {
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191 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
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192 jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));
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193 if (result == 0) {
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194 WhiteBox::set_used();
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195 }
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196 }
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197 }
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198 }
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199 JVM_END