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annotate src/share/vm/prims/whitebox.cpp @ 6972:bd7a7ce2e264

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6830717: replay of compilations would help with debugging Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method. Reviewed-by: kvn, twisti, sspitsyn Contributed-by: yumin.qi@oracle.com
author minqi
date Mon, 12 Nov 2012 14:03:53 -0800
parents da91efe96a93
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