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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class ThreadSafepointState;
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26 class ThreadProfiler;
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27
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28 class JvmtiThreadState;
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29 class JvmtiGetLoadedClassesClosure;
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30 class ThreadStatistics;
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31 class ConcurrentLocksDump;
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32 class ParkEvent ;
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33
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34 class ciEnv;
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35 class CompileThread;
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36 class CompileLog;
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37 class CompileTask;
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38 class CompileQueue;
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39 class CompilerCounters;
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40 class vframeArray;
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41
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42 class DeoptResourceMark;
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43 class jvmtiDeferredLocalVariableSet;
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44
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45 class GCTaskQueue;
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46 class ThreadClosure;
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47 class IdealGraphPrinter;
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48
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49 // Class hierarchy
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50 // - Thread
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51 // - VMThread
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52 // - JavaThread
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53 // - WatcherThread
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54
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55 class Thread: public ThreadShadow {
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56 friend class VMStructs;
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57 private:
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58 // Exception handling
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59 // (Note: _pending_exception and friends are in ThreadShadow)
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60 //oop _pending_exception; // pending exception for current thread
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61 // const char* _exception_file; // file information for exception (debugging only)
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62 // int _exception_line; // line information for exception (debugging only)
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63
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64 // Support for forcing alignment of thread objects for biased locking
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65 void* _real_malloc_address;
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66 public:
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67 void* operator new(size_t size);
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68 void operator delete(void* p);
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69 private:
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70
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71 // ***************************************************************
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72 // Suspend and resume support
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73 // ***************************************************************
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74 //
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75 // VM suspend/resume no longer exists - it was once used for various
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76 // things including safepoints but was deprecated and finally removed
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77 // in Java 7. Because VM suspension was considered "internal" Java-level
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78 // suspension was considered "external", and this legacy naming scheme
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79 // remains.
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80 //
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81 // External suspend/resume requests come from JVM_SuspendThread,
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82 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
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83 // ResumeThread. External
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84 // suspend requests cause _external_suspend to be set and external
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85 // resume requests cause _external_suspend to be cleared.
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86 // External suspend requests do not nest on top of other external
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87 // suspend requests. The higher level APIs reject suspend requests
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88 // for already suspended threads.
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89 //
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90 // The external_suspend
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91 // flag is checked by has_special_runtime_exit_condition() and java thread
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92 // will self-suspend when handle_special_runtime_exit_condition() is
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93 // called. Most uses of the _thread_blocked state in JavaThreads are
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94 // considered the same as being externally suspended; if the blocking
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95 // condition lifts, the JavaThread will self-suspend. Other places
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96 // where VM checks for external_suspend include:
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97 // + mutex granting (do not enter monitors when thread is suspended)
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98 // + state transitions from _thread_in_native
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99 //
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100 // In general, java_suspend() does not wait for an external suspend
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101 // request to complete. When it returns, the only guarantee is that
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102 // the _external_suspend field is true.
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103 //
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104 // wait_for_ext_suspend_completion() is used to wait for an external
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105 // suspend request to complete. External suspend requests are usually
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106 // followed by some other interface call that requires the thread to
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107 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
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108 // the interface that requires quiescence, we give the JavaThread a
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109 // chance to self-suspend before we need it to be quiescent. This
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110 // improves overall suspend/query performance.
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111 //
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112 // _suspend_flags controls the behavior of java_ suspend/resume.
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113 // It must be set under the protection of SR_lock. Read from the flag is
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114 // OK without SR_lock as long as the value is only used as a hint.
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115 // (e.g., check _external_suspend first without lock and then recheck
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116 // inside SR_lock and finish the suspension)
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117 //
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118 // _suspend_flags is also overloaded for other "special conditions" so
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119 // that a single check indicates whether any special action is needed
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120 // eg. for async exceptions.
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121 // -------------------------------------------------------------------
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122 // Notes:
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123 // 1. The suspend/resume logic no longer uses ThreadState in OSThread
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124 // but we still update its value to keep other part of the system (mainly
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125 // JVMTI) happy. ThreadState is legacy code (see notes in
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126 // osThread.hpp).
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127 //
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128 // 2. It would be more natural if set_external_suspend() is private and
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129 // part of java_suspend(), but that probably would affect the suspend/query
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130 // performance. Need more investigation on this.
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131 //
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132
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133 // suspend/resume lock: used for self-suspend
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134 Monitor* _SR_lock;
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135
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136 protected:
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137 enum SuspendFlags {
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138 // NOTE: avoid using the sign-bit as cc generates different test code
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139 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077
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140
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141 _external_suspend = 0x20000000U, // thread is asked to self suspend
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142 _ext_suspended = 0x40000000U, // thread has self-suspended
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143 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
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144
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145 _has_async_exception = 0x00000001U // there is a pending async exception
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146 };
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147
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148 // various suspension related flags - atomically updated
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149 // overloaded for async exception checking in check_special_condition_for_native_trans.
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150 volatile uint32_t _suspend_flags;
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151
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152 private:
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153 int _num_nested_signal;
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154
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155 public:
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156 void enter_signal_handler() { _num_nested_signal++; }
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157 void leave_signal_handler() { _num_nested_signal--; }
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158 bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
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159
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160 private:
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161 // Debug tracing
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162 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
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163
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164 // Active_handles points to a block of handles
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165 JNIHandleBlock* _active_handles;
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166
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167 // One-element thread local free list
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168 JNIHandleBlock* _free_handle_block;
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169
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170 // Point to the last handle mark
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171 HandleMark* _last_handle_mark;
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172
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173 // The parity of the last strong_roots iteration in which this thread was
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174 // claimed as a task.
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175 jint _oops_do_parity;
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176
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177 public:
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178 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
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179 HandleMark* last_handle_mark() const { return _last_handle_mark; }
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180 private:
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181
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182 // debug support for checking if code does allow safepoints or not
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183 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
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184 // mutex, or blocking on an object synchronizer (Java locking).
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185 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases
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186 // If !allow_allocation(), then an assertion failure will happen during allocation
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187 // (Hence, !allow_safepoint() => !allow_allocation()).
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188 //
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189 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
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190 //
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191 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
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192 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
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193
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194 // Record when GC is locked out via the GC_locker mechanism
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195 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
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196
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197 friend class No_Alloc_Verifier;
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198 friend class No_Safepoint_Verifier;
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199 friend class Pause_No_Safepoint_Verifier;
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200 friend class ThreadLocalStorage;
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201 friend class GC_locker;
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202
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203 // In order for all threads to be able to use fast locking, we need to know the highest stack
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204 // address of where a lock is on the stack (stacks normally grow towards lower addresses). This
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205 // variable is initially set to NULL, indicating no locks are used by the thread. During the thread's
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206 // execution, it will be set whenever locking can happen, i.e., when we call out to Java code or use
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207 // an ObjectLocker. The value is never decreased, hence, it will over the lifetime of a thread
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208 // approximate the real stackbase.
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209 address _highest_lock; // Highest stack address where a JavaLock exist
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210
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211 ThreadLocalAllocBuffer _tlab; // Thread-local eden
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212
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213 int _vm_operation_started_count; // VM_Operation support
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214 int _vm_operation_completed_count; // VM_Operation support
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215
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216 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
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217 // is waiting to lock
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218 bool _current_pending_monitor_is_from_java; // locking is from Java code
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219
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220 // ObjectMonitor on which this thread called Object.wait()
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221 ObjectMonitor* _current_waiting_monitor;
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222
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223 // Private thread-local objectmonitor list - a simple cache organized as a SLL.
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224 public:
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225 ObjectMonitor * omFreeList ;
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226 int omFreeCount ; // length of omFreeList
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227 int omFreeProvision ; // reload chunk size
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228
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229 public:
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230 enum {
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231 is_definitely_current_thread = true
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232 };
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233
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234 // Constructor
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235 Thread();
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236 virtual ~Thread();
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237
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238 // initializtion
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239 void initialize_thread_local_storage();
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240
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241 // thread entry point
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242 virtual void run();
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243
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244 // Testers
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245 virtual bool is_VM_thread() const { return false; }
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246 virtual bool is_Java_thread() const { return false; }
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247 // Remove this ifdef when C1 is ported to the compiler interface.
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248 virtual bool is_Compiler_thread() const { return false; }
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249 virtual bool is_hidden_from_external_view() const { return false; }
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250 virtual bool is_jvmti_agent_thread() const { return false; }
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251 // True iff the thread can perform GC operations at a safepoint.
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252 // Generally will be true only of VM thread and parallel GC WorkGang
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253 // threads.
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254 virtual bool is_GC_task_thread() const { return false; }
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255 virtual bool is_Watcher_thread() const { return false; }
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256 virtual bool is_ConcurrentGC_thread() const { return false; }
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257
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258 virtual char* name() const { return (char*)"Unknown thread"; }
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259
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260 // Returns the current thread
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261 static inline Thread* current();
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262
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263 // Common thread operations
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264 static void set_priority(Thread* thread, ThreadPriority priority);
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265 static ThreadPriority get_priority(const Thread* const thread);
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266 static void start(Thread* thread);
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267 static void interrupt(Thread* thr);
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268 static bool is_interrupted(Thread* thr, bool clear_interrupted);
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269
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270 Monitor* SR_lock() const { return _SR_lock; }
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271
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272 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
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273
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274 void set_suspend_flag(SuspendFlags f) {
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275 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
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276 uint32_t flags;
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277 do {
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278 flags = _suspend_flags;
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279 }
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280 while (Atomic::cmpxchg((jint)(flags | f),
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281 (volatile jint*)&_suspend_flags,
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282 (jint)flags) != (jint)flags);
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283 }
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284 void clear_suspend_flag(SuspendFlags f) {
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285 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
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286 uint32_t flags;
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287 do {
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288 flags = _suspend_flags;
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289 }
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290 while (Atomic::cmpxchg((jint)(flags & ~f),
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291 (volatile jint*)&_suspend_flags,
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292 (jint)flags) != (jint)flags);
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293 }
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294
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295 void set_has_async_exception() {
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296 set_suspend_flag(_has_async_exception);
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297 }
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298 void clear_has_async_exception() {
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299 clear_suspend_flag(_has_async_exception);
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300 }
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301
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302 // Support for Unhandled Oop detection
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303 #ifdef CHECK_UNHANDLED_OOPS
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304 private:
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305 UnhandledOops *_unhandled_oops;
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306 public:
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307 UnhandledOops* unhandled_oops() { return _unhandled_oops; }
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308 // Mark oop safe for gc. It may be stack allocated but won't move.
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309 void allow_unhandled_oop(oop *op) {
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310 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
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311 }
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312 // Clear oops at safepoint so crashes point to unhandled oop violator
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313 void clear_unhandled_oops() {
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314 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
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315 }
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316 bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
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317 #endif // CHECK_UNHANDLED_OOPS
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318
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319 public:
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320 // Installs a pending exception to be inserted later
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321 static void send_async_exception(oop thread_oop, oop java_throwable);
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322
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323 // Resource area
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324 ResourceArea* resource_area() const { return _resource_area; }
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325 void set_resource_area(ResourceArea* area) { _resource_area = area; }
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326
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327 OSThread* osthread() const { return _osthread; }
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328 void set_osthread(OSThread* thread) { _osthread = thread; }
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329
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330 // JNI handle support
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331 JNIHandleBlock* active_handles() const { return _active_handles; }
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332 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
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333 JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
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334 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
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335
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336 // Internal handle support
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337 HandleArea* handle_area() const { return _handle_area; }
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338 void set_handle_area(HandleArea* area) { _handle_area = area; }
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339
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340 // Thread-Local Allocation Buffer (TLAB) support
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341 ThreadLocalAllocBuffer& tlab() { return _tlab; }
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342 void initialize_tlab() {
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343 if (UseTLAB) {
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344 tlab().initialize();
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345 }
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346 }
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347
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348 // VM operation support
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349 int vm_operation_ticket() { return ++_vm_operation_started_count; }
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350 int vm_operation_completed_count() { return _vm_operation_completed_count; }
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351 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
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352
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353 // For tracking the heavyweight monitor the thread is pending on.
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354 ObjectMonitor* current_pending_monitor() {
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355 return _current_pending_monitor;
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356 }
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357 void set_current_pending_monitor(ObjectMonitor* monitor) {
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358 _current_pending_monitor = monitor;
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359 }
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360 void set_current_pending_monitor_is_from_java(bool from_java) {
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361 _current_pending_monitor_is_from_java = from_java;
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362 }
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363 bool current_pending_monitor_is_from_java() {
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364 return _current_pending_monitor_is_from_java;
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365 }
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366
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367 // For tracking the ObjectMonitor on which this thread called Object.wait()
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368 ObjectMonitor* current_waiting_monitor() {
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369 return _current_waiting_monitor;
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370 }
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371 void set_current_waiting_monitor(ObjectMonitor* monitor) {
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372 _current_waiting_monitor = monitor;
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373 }
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374
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375 // GC support
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376 // Apply "f->do_oop" to all root oops in "this".
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377 void oops_do(OopClosure* f);
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378
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379 // Handles the parallel case for the method below.
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380 private:
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381 bool claim_oops_do_par_case(int collection_parity);
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382 public:
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383 // Requires that "collection_parity" is that of the current strong roots
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384 // iteration. If "is_par" is false, sets the parity of "this" to
|
|
|
385 // "collection_parity", and returns "true". If "is_par" is true,
|
|
|
386 // uses an atomic instruction to set the current threads parity to
|
|
|
387 // "collection_parity", if it is not already. Returns "true" iff the
|
|
|
388 // calling thread does the update, this indicates that the calling thread
|
|
|
389 // has claimed the thread's stack as a root groop in the current
|
|
|
390 // collection.
|
|
|
391 bool claim_oops_do(bool is_par, int collection_parity) {
|
|
|
392 if (!is_par) {
|
|
|
393 _oops_do_parity = collection_parity;
|
|
|
394 return true;
|
|
|
395 } else {
|
|
|
396 return claim_oops_do_par_case(collection_parity);
|
|
|
397 }
|
|
|
398 }
|
|
|
399
|
|
|
400 // Sweeper support
|
|
|
401 void nmethods_do();
|
|
|
402
|
|
|
403 // Fast-locking support
|
|
|
404 address highest_lock() const { return _highest_lock; }
|
|
|
405 void update_highest_lock(address base) { if (base > _highest_lock) _highest_lock = base; }
|
|
|
406
|
|
|
407 // Tells if adr belong to this thread. This is used
|
|
|
408 // for checking if a lock is owned by the running thread.
|
|
|
409 // Warning: the method can only be used on the running thread
|
|
|
410 // Fast lock support uses these methods
|
|
|
411 virtual bool lock_is_in_stack(address adr) const;
|
|
|
412 virtual bool is_lock_owned(address adr) const;
|
|
|
413
|
|
|
414 // Check if address is in the stack of the thread (not just for locks).
|
|
|
415 bool is_in_stack(address adr) const;
|
|
|
416
|
|
|
417 // Sets this thread as starting thread. Returns failure if thread
|
|
|
418 // creation fails due to lack of memory, too many threads etc.
|
|
|
419 bool set_as_starting_thread();
|
|
|
420
|
|
|
421 protected:
|
|
|
422 // OS data associated with the thread
|
|
|
423 OSThread* _osthread; // Platform-specific thread information
|
|
|
424
|
|
|
425 // Thread local resource area for temporary allocation within the VM
|
|
|
426 ResourceArea* _resource_area;
|
|
|
427
|
|
|
428 // Thread local handle area for allocation of handles within the VM
|
|
|
429 HandleArea* _handle_area;
|
|
|
430
|
|
|
431 // Support for stack overflow handling, get_thread, etc.
|
|
|
432 address _stack_base;
|
|
|
433 size_t _stack_size;
|
|
|
434 uintptr_t _self_raw_id; // used by get_thread (mutable)
|
|
|
435 int _lgrp_id;
|
|
|
436
|
|
|
437 public:
|
|
|
438 // Stack overflow support
|
|
|
439 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
|
|
|
440
|
|
|
441 void set_stack_base(address base) { _stack_base = base; }
|
|
|
442 size_t stack_size() const { return _stack_size; }
|
|
|
443 void set_stack_size(size_t size) { _stack_size = size; }
|
|
|
444 void record_stack_base_and_size();
|
|
|
445
|
|
|
446 int lgrp_id() const { return _lgrp_id; }
|
|
|
447 void set_lgrp_id(int value) { _lgrp_id = value; }
|
|
|
448
|
|
|
449 // Printing
|
|
|
450 void print_on(outputStream* st) const;
|
|
|
451 void print() const { print_on(tty); }
|
|
|
452 virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
|
|
|
453
|
|
|
454 // Debug-only code
|
|
|
455
|
|
|
456 #ifdef ASSERT
|
|
|
457 private:
|
|
|
458 // Deadlock detection support for Mutex locks. List of locks own by thread.
|
|
|
459 Monitor *_owned_locks;
|
|
|
460 // Mutex::set_owner_implementation is the only place where _owned_locks is modified,
|
|
|
461 // thus the friendship
|
|
|
462 friend class Mutex;
|
|
|
463 friend class Monitor;
|
|
|
464
|
|
|
465 public:
|
|
|
466 void print_owned_locks_on(outputStream* st) const;
|
|
|
467 void print_owned_locks() const { print_owned_locks_on(tty); }
|
|
|
468 Monitor * owned_locks() const { return _owned_locks; }
|
|
|
469 bool owns_locks() const { return owned_locks() != NULL; }
|
|
|
470 bool owns_locks_but_compiled_lock() const;
|
|
|
471
|
|
|
472 // Deadlock detection
|
|
|
473 bool allow_allocation() { return _allow_allocation_count == 0; }
|
|
|
474 #endif
|
|
|
475
|
|
|
476 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
|
|
|
477
|
|
|
478 private:
|
|
|
479 volatile int _jvmti_env_iteration_count;
|
|
|
480
|
|
|
481 public:
|
|
|
482 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
|
|
|
483 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
|
|
|
484 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
|
|
|
485
|
|
|
486 // Code generation
|
|
|
487 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
|
|
|
488 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
|
|
|
489 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
|
|
|
490
|
|
|
491 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
|
|
|
492 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
|
|
|
493 static ByteSize omFreeList_offset() { return byte_offset_of(Thread, omFreeList); }
|
|
|
494
|
|
|
495 #define TLAB_FIELD_OFFSET(name) \
|
|
|
496 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
|
|
|
497
|
|
|
498 TLAB_FIELD_OFFSET(start)
|
|
|
499 TLAB_FIELD_OFFSET(end)
|
|
|
500 TLAB_FIELD_OFFSET(top)
|
|
|
501 TLAB_FIELD_OFFSET(pf_top)
|
|
|
502 TLAB_FIELD_OFFSET(size) // desired_size
|
|
|
503 TLAB_FIELD_OFFSET(refill_waste_limit)
|
|
|
504 TLAB_FIELD_OFFSET(number_of_refills)
|
|
|
505 TLAB_FIELD_OFFSET(fast_refill_waste)
|
|
|
506 TLAB_FIELD_OFFSET(slow_allocations)
|
|
|
507
|
|
|
508 #undef TLAB_FIELD_OFFSET
|
|
|
509
|
|
|
510 public:
|
|
|
511 volatile intptr_t _Stalled ;
|
|
|
512 volatile int _TypeTag ;
|
|
|
513 ParkEvent * _ParkEvent ; // for synchronized()
|
|
|
514 ParkEvent * _SleepEvent ; // for Thread.sleep
|
|
|
515 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
|
|
|
516 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
|
|
|
517 int NativeSyncRecursion ; // diagnostic
|
|
|
518
|
|
|
519 volatile int _OnTrap ; // Resume-at IP delta
|
|
|
520 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
|
|
|
521 jint _hashStateX ; // thread-specific hashCode generator state
|
|
|
522 jint _hashStateY ;
|
|
|
523 jint _hashStateZ ;
|
|
|
524 void * _schedctl ;
|
|
|
525
|
|
|
526 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
|
|
|
527 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
|
|
|
528 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
|
|
|
529
|
|
|
530 volatile jint rng [4] ; // RNG for spin loop
|
|
|
531
|
|
|
532 // Low-level leaf-lock primitives used to implement synchronization
|
|
|
533 // and native monitor-mutex infrastructure.
|
|
|
534 // Not for general synchronization use.
|
|
|
535 static void SpinAcquire (volatile int * Lock, const char * Name) ;
|
|
|
536 static void SpinRelease (volatile int * Lock) ;
|
|
|
537 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
|
|
|
538 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
|
|
|
539 static void muxRelease (volatile intptr_t * Lock) ;
|
|
|
540
|
|
|
541 };
|
|
|
542
|
|
|
543 // Inline implementation of Thread::current()
|
|
|
544 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
|
|
|
545 // startup.
|
|
|
546 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
|
|
|
547 // period. This is inlined in thread_<os_family>.inline.hpp.
|
|
|
548
|
|
|
549 inline Thread* Thread::current() {
|
|
|
550 #ifdef ASSERT
|
|
|
551 // This function is very high traffic. Define PARANOID to enable expensive
|
|
|
552 // asserts.
|
|
|
553 #ifdef PARANOID
|
|
|
554 // Signal handler should call ThreadLocalStorage::get_thread_slow()
|
|
|
555 Thread* t = ThreadLocalStorage::get_thread_slow();
|
|
|
556 assert(t != NULL && !t->is_inside_signal_handler(),
|
|
|
557 "Don't use Thread::current() inside signal handler");
|
|
|
558 #endif
|
|
|
559 #endif
|
|
|
560 Thread* thread = ThreadLocalStorage::thread();
|
|
|
561 assert(thread != NULL, "just checking");
|
|
|
562 return thread;
|
|
|
563 }
|
|
|
564
|
|
|
565 // Name support for threads. non-JavaThread subclasses with multiple
|
|
|
566 // uniquely named instances should derive from this.
|
|
|
567 class NamedThread: public Thread {
|
|
|
568 friend class VMStructs;
|
|
|
569 enum {
|
|
|
570 max_name_len = 64
|
|
|
571 };
|
|
|
572 private:
|
|
|
573 char* _name;
|
|
|
574 public:
|
|
|
575 NamedThread();
|
|
|
576 ~NamedThread();
|
|
|
577 // May only be called once per thread.
|
|
|
578 void set_name(const char* format, ...);
|
|
|
579 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
|
|
|
580 };
|
|
|
581
|
|
|
582 // Worker threads are named and have an id of an assigned work.
|
|
|
583 class WorkerThread: public NamedThread {
|
|
|
584 private:
|
|
|
585 uint _id;
|
|
|
586 public:
|
|
|
587 WorkerThread() : _id(0) { }
|
|
|
588 void set_id(uint work_id) { _id = work_id; }
|
|
|
589 uint id() const { return _id; }
|
|
|
590 };
|
|
|
591
|
|
|
592 // A single WatcherThread is used for simulating timer interrupts.
|
|
|
593 class WatcherThread: public Thread {
|
|
|
594 friend class VMStructs;
|
|
|
595 public:
|
|
|
596 virtual void run();
|
|
|
597
|
|
|
598 private:
|
|
|
599 static WatcherThread* _watcher_thread;
|
|
|
600
|
|
|
601 static bool _should_terminate;
|
|
|
602 public:
|
|
|
603 enum SomeConstants {
|
|
|
604 delay_interval = 10 // interrupt delay in milliseconds
|
|
|
605 };
|
|
|
606
|
|
|
607 // Constructor
|
|
|
608 WatcherThread();
|
|
|
609
|
|
|
610 // Tester
|
|
|
611 bool is_Watcher_thread() const { return true; }
|
|
|
612
|
|
|
613 // Printing
|
|
|
614 char* name() const { return (char*)"VM Periodic Task Thread"; }
|
|
|
615 void print_on(outputStream* st) const;
|
|
|
616 void print() const { print_on(tty); }
|
|
|
617
|
|
|
618 // Returns the single instance of WatcherThread
|
|
|
619 static WatcherThread* watcher_thread() { return _watcher_thread; }
|
|
|
620
|
|
|
621 // Create and start the single instance of WatcherThread, or stop it on shutdown
|
|
|
622 static void start();
|
|
|
623 static void stop();
|
|
|
624 };
|
|
|
625
|
|
|
626
|
|
|
627 class CompilerThread;
|
|
|
628
|
|
|
629 typedef void (*ThreadFunction)(JavaThread*, TRAPS);
|
|
|
630
|
|
|
631 class JavaThread: public Thread {
|
|
|
632 friend class VMStructs;
|
|
|
633 private:
|
|
|
634 JavaThread* _next; // The next thread in the Threads list
|
|
|
635 oop _threadObj; // The Java level thread object
|
|
|
636
|
|
|
637 #ifdef ASSERT
|
|
|
638 private:
|
|
|
639 int _java_call_counter;
|
|
|
640
|
|
|
641 public:
|
|
|
642 int java_call_counter() { return _java_call_counter; }
|
|
|
643 void inc_java_call_counter() { _java_call_counter++; }
|
|
|
644 void dec_java_call_counter() {
|
|
|
645 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
|
|
|
646 _java_call_counter--;
|
|
|
647 }
|
|
|
648 private: // restore original namespace restriction
|
|
|
649 #endif // ifdef ASSERT
|
|
|
650
|
|
|
651 #ifndef PRODUCT
|
|
|
652 public:
|
|
|
653 enum {
|
|
|
654 jump_ring_buffer_size = 16
|
|
|
655 };
|
|
|
656 private: // restore original namespace restriction
|
|
|
657 #endif
|
|
|
658
|
|
|
659 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
|
|
|
660
|
|
|
661 ThreadFunction _entry_point;
|
|
|
662
|
|
|
663 JNIEnv _jni_environment;
|
|
|
664
|
|
|
665 // Deopt support
|
|
|
666 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
|
|
|
667
|
|
|
668 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
|
|
|
669 // transition out of native
|
|
|
670
|
|
|
671 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
|
|
|
672 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
|
|
|
673 // Because deoptimization is lazy we must save jvmti requests to set locals
|
|
|
674 // in compiled frames until we deoptimize and we have an interpreter frame.
|
|
|
675 // This holds the pointer to array (yeah like there might be more than one) of
|
|
|
676 // description of compiled vframes that have locals that need to be updated.
|
|
|
677 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
|
|
|
678
|
|
|
679 // Handshake value for fixing 6243940. We need a place for the i2c
|
|
|
680 // adapter to store the callee methodOop. This value is NEVER live
|
|
|
681 // across a gc point so it does NOT have to be gc'd
|
|
|
682 // The handshake is open ended since we can't be certain that it will
|
|
|
683 // be NULLed. This is because we rarely ever see the race and end up
|
|
|
684 // in handle_wrong_method which is the backend of the handshake. See
|
|
|
685 // code in i2c adapters and handle_wrong_method.
|
|
|
686
|
|
|
687 methodOop _callee_target;
|
|
|
688
|
|
|
689 // Oop results of VM runtime calls
|
|
|
690 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
|
|
|
691 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
|
|
|
692
|
|
|
693 MonitorChunk* _monitor_chunks; // Contains the off stack monitors
|
|
|
694 // allocated during deoptimization
|
|
|
695 // and by JNI_MonitorEnter/Exit
|
|
|
696
|
|
|
697 // Async. requests support
|
|
|
698 enum AsyncRequests {
|
|
|
699 _no_async_condition = 0,
|
|
|
700 _async_exception,
|
|
|
701 _async_unsafe_access_error
|
|
|
702 };
|
|
|
703 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
|
|
|
704 oop _pending_async_exception;
|
|
|
705
|
|
|
706 // Safepoint support
|
|
|
707 public: // Expose _thread_state for SafeFetchInt()
|
|
|
708 volatile JavaThreadState _thread_state;
|
|
|
709 private:
|
|
|
710 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
|
|
|
711 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
|
|
|
712
|
|
|
713 // JavaThread termination support
|
|
|
714 enum TerminatedTypes {
|
|
|
715 _not_terminated = 0xDEAD - 2,
|
|
|
716 _thread_exiting, // JavaThread::exit() has been called for this thread
|
|
|
717 _thread_terminated, // JavaThread is removed from thread list
|
|
|
718 _vm_exited // JavaThread is still executing native code, but VM is terminated
|
|
|
719 // only VM_Exit can set _vm_exited
|
|
|
720 };
|
|
|
721
|
|
|
722 // In general a JavaThread's _terminated field transitions as follows:
|
|
|
723 //
|
|
|
724 // _not_terminated => _thread_exiting => _thread_terminated
|
|
|
725 //
|
|
|
726 // _vm_exited is a special value to cover the case of a JavaThread
|
|
|
727 // executing native code after the VM itself is terminated.
|
|
|
728 TerminatedTypes _terminated;
|
|
|
729 // suspend/resume support
|
|
|
730 volatile bool _suspend_equivalent; // Suspend equivalent condition
|
|
|
731 jint _in_deopt_handler; // count of deoptimization
|
|
|
732 // handlers thread is in
|
|
|
733 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
|
|
|
734 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
|
|
|
735 // never locked) when throwing an exception. Used by interpreter only.
|
|
|
736
|
|
|
737 // Flag to mark a JNI thread in the process of attaching - See CR 6404306
|
|
|
738 // This flag is never set true other than at construction, and in that case
|
|
|
739 // is shortly thereafter set false
|
|
|
740 volatile bool _is_attaching;
|
|
|
741
|
|
|
742 public:
|
|
|
743 // State of the stack guard pages for this thread.
|
|
|
744 enum StackGuardState {
|
|
|
745 stack_guard_unused, // not needed
|
|
|
746 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
|
|
|
747 stack_guard_enabled // enabled
|
|
|
748 };
|
|
|
749
|
|
|
750 private:
|
|
|
751
|
|
|
752 StackGuardState _stack_guard_state;
|
|
|
753
|
|
|
754 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
|
|
|
755 // used to temp. parsing values into and out of the runtime system during exception handling for compiled
|
|
|
756 // code)
|
|
|
757 volatile oop _exception_oop; // Exception thrown in compiled code
|
|
|
758 volatile address _exception_pc; // PC where exception happened
|
|
|
759 volatile address _exception_handler_pc; // PC for handler of exception
|
|
|
760 volatile int _exception_stack_size; // Size of frame where exception happened
|
|
|
761
|
|
|
762 // support for compilation
|
|
|
763 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
|
|
|
764
|
|
|
765 // support for JNI critical regions
|
|
|
766 jint _jni_active_critical; // count of entries into JNI critical region
|
|
|
767
|
|
|
768 // For deadlock detection.
|
|
|
769 int _depth_first_number;
|
|
|
770
|
|
|
771 // JVMTI PopFrame support
|
|
|
772 // This is set to popframe_pending to signal that top Java frame should be popped immediately
|
|
|
773 int _popframe_condition;
|
|
|
774
|
|
|
775 #ifndef PRODUCT
|
|
|
776 int _jmp_ring_index;
|
|
|
777 struct {
|
|
|
778 // We use intptr_t instead of address so debugger doesn't try and display strings
|
|
|
779 intptr_t _target;
|
|
|
780 intptr_t _instruction;
|
|
|
781 const char* _file;
|
|
|
782 int _line;
|
|
|
783 } _jmp_ring[ jump_ring_buffer_size ];
|
|
|
784 #endif /* PRODUCT */
|
|
|
785
|
|
|
786 friend class VMThread;
|
|
|
787 friend class ThreadWaitTransition;
|
|
|
788 friend class VM_Exit;
|
|
|
789
|
|
|
790 void initialize(); // Initialized the instance variables
|
|
|
791
|
|
|
792 public:
|
|
|
793 // Constructor
|
|
|
794 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads
|
|
|
795 JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
|
|
|
796 ~JavaThread();
|
|
|
797
|
|
|
798 #ifdef ASSERT
|
|
|
799 // verify this JavaThread hasn't be published in the Threads::list yet
|
|
|
800 void verify_not_published();
|
|
|
801 #endif
|
|
|
802
|
|
|
803 //JNI functiontable getter/setter for JVMTI jni function table interception API.
|
|
|
804 void set_jni_functions(struct JNINativeInterface_* functionTable) {
|
|
|
805 _jni_environment.functions = functionTable;
|
|
|
806 }
|
|
|
807 struct JNINativeInterface_* get_jni_functions() {
|
|
|
808 return (struct JNINativeInterface_ *)_jni_environment.functions;
|
|
|
809 }
|
|
|
810
|
|
|
811 // Executes Shutdown.shutdown()
|
|
|
812 void invoke_shutdown_hooks();
|
|
|
813
|
|
|
814 // Cleanup on thread exit
|
|
|
815 enum ExitType {
|
|
|
816 normal_exit,
|
|
|
817 jni_detach
|
|
|
818 };
|
|
|
819 void exit(bool destroy_vm, ExitType exit_type = normal_exit);
|
|
|
820
|
|
|
821 void cleanup_failed_attach_current_thread();
|
|
|
822
|
|
|
823 // Testers
|
|
|
824 virtual bool is_Java_thread() const { return true; }
|
|
|
825
|
|
|
826 // compilation
|
|
|
827 void set_is_compiling(bool f) { _is_compiling = f; }
|
|
|
828 bool is_compiling() const { return _is_compiling; }
|
|
|
829
|
|
|
830 // Thread chain operations
|
|
|
831 JavaThread* next() const { return _next; }
|
|
|
832 void set_next(JavaThread* p) { _next = p; }
|
|
|
833
|
|
|
834 // Thread oop. threadObj() can be NULL for initial JavaThread
|
|
|
835 // (or for threads attached via JNI)
|
|
|
836 oop threadObj() const { return _threadObj; }
|
|
|
837 void set_threadObj(oop p) { _threadObj = p; }
|
|
|
838
|
|
|
839 ThreadPriority java_priority() const; // Read from threadObj()
|
|
|
840
|
|
|
841 // Prepare thread and add to priority queue. If a priority is
|
|
|
842 // not specified, use the priority of the thread object. Threads_lock
|
|
|
843 // must be held while this function is called.
|
|
|
844 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
|
|
|
845
|
|
|
846 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
|
|
|
847 address saved_exception_pc() { return _saved_exception_pc; }
|
|
|
848
|
|
|
849
|
|
|
850 ThreadFunction entry_point() const { return _entry_point; }
|
|
|
851
|
|
|
852 // Allocates a new Java level thread object for this thread. thread_name may be NULL.
|
|
|
853 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
|
|
|
854
|
|
|
855 // Last frame anchor routines
|
|
|
856
|
|
|
857 JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
|
|
|
858
|
|
|
859 // last_Java_sp
|
|
|
860 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
|
|
|
861 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
|
|
|
862
|
|
|
863 // last_Java_pc
|
|
|
864
|
|
|
865 address last_Java_pc(void) { return _anchor.last_Java_pc(); }
|
|
|
866
|
|
|
867 // Safepoint support
|
|
|
868 JavaThreadState thread_state() const { return _thread_state; }
|
|
|
869 void set_thread_state(JavaThreadState s) { _thread_state=s; }
|
|
|
870 ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
|
|
|
871 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
|
|
|
872 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
|
|
|
873
|
|
|
874 // thread has called JavaThread::exit() or is terminated
|
|
|
875 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
|
|
|
876 // thread is terminated (no longer on the threads list); we compare
|
|
|
877 // against the two non-terminated values so that a freed JavaThread
|
|
|
878 // will also be considered terminated.
|
|
|
879 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
|
|
|
880 void set_terminated(TerminatedTypes t) { _terminated = t; }
|
|
|
881 // special for Threads::remove() which is static:
|
|
|
882 void set_terminated_value() { _terminated = _thread_terminated; }
|
|
|
883 void block_if_vm_exited();
|
|
|
884
|
|
|
885 bool doing_unsafe_access() { return _doing_unsafe_access; }
|
|
|
886 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
|
|
|
887
|
|
|
888 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
|
|
|
889 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
|
|
|
890
|
|
|
891
|
|
|
892 // Suspend/resume support for JavaThread
|
|
|
893
|
|
|
894 private:
|
|
|
895 void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
|
|
|
896 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
|
|
|
897
|
|
|
898 public:
|
|
|
899 void java_suspend();
|
|
|
900 void java_resume();
|
|
|
901 int java_suspend_self();
|
|
|
902
|
|
|
903 void check_and_wait_while_suspended() {
|
|
|
904 assert(JavaThread::current() == this, "sanity check");
|
|
|
905
|
|
|
906 bool do_self_suspend;
|
|
|
907 do {
|
|
|
908 // were we externally suspended while we were waiting?
|
|
|
909 do_self_suspend = handle_special_suspend_equivalent_condition();
|
|
|
910 if (do_self_suspend) {
|
|
|
911 // don't surprise the thread that suspended us by returning
|
|
|
912 java_suspend_self();
|
|
|
913 set_suspend_equivalent();
|
|
|
914 }
|
|
|
915 } while (do_self_suspend);
|
|
|
916 }
|
|
|
917 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
|
|
|
918 // Check for async exception in addition to safepoint and suspend request.
|
|
|
919 static void check_special_condition_for_native_trans(JavaThread *thread);
|
|
|
920
|
|
|
921 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
|
|
|
922 bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
|
|
|
923 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
|
924 // Warning: is_ext_suspend_completed() may temporarily drop the
|
|
|
925 // SR_lock to allow the thread to reach a stable thread state if
|
|
|
926 // it is currently in a transient thread state.
|
|
|
927 return is_ext_suspend_completed(false /*!called_by_wait */,
|
|
|
928 SuspendRetryDelay, bits);
|
|
|
929 }
|
|
|
930
|
|
|
931 // We cannot allow wait_for_ext_suspend_completion() to run forever or
|
|
|
932 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally
|
|
|
933 // passed as the count and delay parameters. Experiments with specific
|
|
|
934 // calls to wait_for_ext_suspend_completion() can be done by passing
|
|
|
935 // other values in the code. Experiments with all calls can be done
|
|
|
936 // via the appropriate -XX options.
|
|
|
937 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
|
|
|
938
|
|
|
939 void set_external_suspend() { set_suspend_flag (_external_suspend); }
|
|
|
940 void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
|
|
|
941
|
|
|
942 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
|
|
|
943 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
|
|
|
944 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
|
|
|
945
|
|
|
946 bool is_external_suspend() const {
|
|
|
947 return (_suspend_flags & _external_suspend) != 0;
|
|
|
948 }
|
|
|
949 // Whenever a thread transitions from native to vm/java it must suspend
|
|
|
950 // if external|deopt suspend is present.
|
|
|
951 bool is_suspend_after_native() const {
|
|
|
952 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
|
|
|
953 }
|
|
|
954
|
|
|
955 // external suspend request is completed
|
|
|
956 bool is_ext_suspended() const {
|
|
|
957 return (_suspend_flags & _ext_suspended) != 0;
|
|
|
958 }
|
|
|
959
|
|
|
960 // legacy method that checked for either external suspension or vm suspension
|
|
|
961 bool is_any_suspended() const {
|
|
|
962 return is_ext_suspended();
|
|
|
963 }
|
|
|
964
|
|
|
965 bool is_external_suspend_with_lock() const {
|
|
|
966 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
|
967 return is_external_suspend();
|
|
|
968 }
|
|
|
969
|
|
|
970 // Special method to handle a pending external suspend request
|
|
|
971 // when a suspend equivalent condition lifts.
|
|
|
972 bool handle_special_suspend_equivalent_condition() {
|
|
|
973 assert(is_suspend_equivalent(),
|
|
|
974 "should only be called in a suspend equivalence condition");
|
|
|
975 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
|
976 bool ret = is_external_suspend();
|
|
|
977 if (!ret) {
|
|
|
978 // not about to self-suspend so clear suspend equivalence
|
|
|
979 clear_suspend_equivalent();
|
|
|
980 }
|
|
|
981 // implied else:
|
|
|
982 // We have a pending external suspend request so we leave the
|
|
|
983 // suspend_equivalent flag set until java_suspend_self() sets
|
|
|
984 // the ext_suspended flag and clears the suspend_equivalent
|
|
|
985 // flag. This insures that wait_for_ext_suspend_completion()
|
|
|
986 // will return consistent values.
|
|
|
987 return ret;
|
|
|
988 }
|
|
|
989
|
|
|
990 bool is_any_suspended_with_lock() const {
|
|
|
991 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
|
992 return is_any_suspended();
|
|
|
993 }
|
|
|
994 // utility methods to see if we are doing some kind of suspension
|
|
|
995 bool is_being_ext_suspended() const {
|
|
|
996 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
|
997 return is_ext_suspended() || is_external_suspend();
|
|
|
998 }
|
|
|
999
|
|
|
1000 bool is_suspend_equivalent() const { return _suspend_equivalent; }
|
|
|
1001
|
|
|
1002 void set_suspend_equivalent() { _suspend_equivalent = true; };
|
|
|
1003 void clear_suspend_equivalent() { _suspend_equivalent = false; };
|
|
|
1004
|
|
|
1005 // Thread.stop support
|
|
|
1006 void send_thread_stop(oop throwable);
|
|
|
1007 AsyncRequests clear_special_runtime_exit_condition() {
|
|
|
1008 AsyncRequests x = _special_runtime_exit_condition;
|
|
|
1009 _special_runtime_exit_condition = _no_async_condition;
|
|
|
1010 return x;
|
|
|
1011 }
|
|
|
1012
|
|
|
1013 // Are any async conditions present?
|
|
|
1014 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
|
|
|
1015
|
|
|
1016 void check_and_handle_async_exceptions(bool check_unsafe_error = true);
|
|
|
1017
|
|
|
1018 // these next two are also used for self-suspension and async exception support
|
|
|
1019 void handle_special_runtime_exit_condition(bool check_asyncs = true);
|
|
|
1020
|
|
|
1021 // Return true if JavaThread has an asynchronous condition or
|
|
|
1022 // if external suspension is requested.
|
|
|
1023 bool has_special_runtime_exit_condition() {
|
|
|
1024 // We call is_external_suspend() last since external suspend should
|
|
|
1025 // be less common. Because we don't use is_external_suspend_with_lock
|
|
|
1026 // it is possible that we won't see an asynchronous external suspend
|
|
|
1027 // request that has just gotten started, i.e., SR_lock grabbed but
|
|
|
1028 // _external_suspend field change either not made yet or not visible
|
|
|
1029 // yet. However, this is okay because the request is asynchronous and
|
|
|
1030 // we will see the new flag value the next time through. It's also
|
|
|
1031 // possible that the external suspend request is dropped after
|
|
|
1032 // we have checked is_external_suspend(), we will recheck its value
|
|
|
1033 // under SR_lock in java_suspend_self().
|
|
|
1034 return (_special_runtime_exit_condition != _no_async_condition) ||
|
|
|
1035 is_external_suspend() || is_deopt_suspend();
|
|
|
1036 }
|
|
|
1037
|
|
|
1038 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
|
|
|
1039
|
|
|
1040 void set_pending_async_exception(oop e) {
|
|
|
1041 _pending_async_exception = e;
|
|
|
1042 _special_runtime_exit_condition = _async_exception;
|
|
|
1043 set_has_async_exception();
|
|
|
1044 }
|
|
|
1045
|
|
|
1046 // Fast-locking support
|
|
|
1047 bool is_lock_owned(address adr) const;
|
|
|
1048
|
|
|
1049 // Accessors for vframe array top
|
|
|
1050 // The linked list of vframe arrays are sorted on sp. This means when we
|
|
|
1051 // unpack the head must contain the vframe array to unpack.
|
|
|
1052 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
|
|
|
1053 vframeArray* vframe_array_head() const { return _vframe_array_head; }
|
|
|
1054
|
|
|
1055 // Side structure for defering update of java frame locals until deopt occurs
|
|
|
1056 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
|
|
|
1057 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
|
|
|
1058
|
|
|
1059 // These only really exist to make debugging deopt problems simpler
|
|
|
1060
|
|
|
1061 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
|
|
|
1062 vframeArray* vframe_array_last() const { return _vframe_array_last; }
|
|
|
1063
|
|
|
1064 // The special resourceMark used during deoptimization
|
|
|
1065
|
|
|
1066 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
|
|
|
1067 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
|
|
|
1068
|
|
|
1069 intptr_t* must_deopt_id() { return _must_deopt_id; }
|
|
|
1070 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
|
|
|
1071 void clear_must_deopt_id() { _must_deopt_id = NULL; }
|
|
|
1072
|
|
|
1073 methodOop callee_target() const { return _callee_target; }
|
|
|
1074 void set_callee_target (methodOop x) { _callee_target = x; }
|
|
|
1075
|
|
|
1076 // Oop results of vm runtime calls
|
|
|
1077 oop vm_result() const { return _vm_result; }
|
|
|
1078 void set_vm_result (oop x) { _vm_result = x; }
|
|
|
1079
|
|
|
1080 oop vm_result_2() const { return _vm_result_2; }
|
|
|
1081 void set_vm_result_2 (oop x) { _vm_result_2 = x; }
|
|
|
1082
|
|
|
1083 // Exception handling for compiled methods
|
|
|
1084 oop exception_oop() const { return _exception_oop; }
|
|
|
1085 int exception_stack_size() const { return _exception_stack_size; }
|
|
|
1086 address exception_pc() const { return _exception_pc; }
|
|
|
1087 address exception_handler_pc() const { return _exception_handler_pc; }
|
|
|
1088
|
|
|
1089 void set_exception_oop(oop o) { _exception_oop = o; }
|
|
|
1090 void set_exception_pc(address a) { _exception_pc = a; }
|
|
|
1091 void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
|
|
|
1092 void set_exception_stack_size(int size) { _exception_stack_size = size; }
|
|
|
1093
|
|
|
1094 // Stack overflow support
|
|
|
1095 inline size_t stack_available(address cur_sp);
|
|
|
1096 address stack_yellow_zone_base()
|
|
|
1097 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
|
|
|
1098 size_t stack_yellow_zone_size()
|
|
|
1099 { return StackYellowPages * os::vm_page_size(); }
|
|
|
1100 address stack_red_zone_base()
|
|
|
1101 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
|
|
|
1102 size_t stack_red_zone_size()
|
|
|
1103 { return StackRedPages * os::vm_page_size(); }
|
|
|
1104 bool in_stack_yellow_zone(address a)
|
|
|
1105 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
|
|
|
1106 bool in_stack_red_zone(address a)
|
|
|
1107 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
|
|
|
1108
|
|
|
1109 void create_stack_guard_pages();
|
|
|
1110 void remove_stack_guard_pages();
|
|
|
1111
|
|
|
1112 void enable_stack_yellow_zone();
|
|
|
1113 void disable_stack_yellow_zone();
|
|
|
1114 void enable_stack_red_zone();
|
|
|
1115 void disable_stack_red_zone();
|
|
|
1116
|
|
|
1117 inline bool stack_yellow_zone_disabled();
|
|
|
1118 inline bool stack_yellow_zone_enabled();
|
|
|
1119
|
|
|
1120 // Attempt to reguard the stack after a stack overflow may have occurred.
|
|
|
1121 // Returns true if (a) guard pages are not needed on this thread, (b) the
|
|
|
1122 // pages are already guarded, or (c) the pages were successfully reguarded.
|
|
|
1123 // Returns false if there is not enough stack space to reguard the pages, in
|
|
|
1124 // which case the caller should unwind a frame and try again. The argument
|
|
|
1125 // should be the caller's (approximate) sp.
|
|
|
1126 bool reguard_stack(address cur_sp);
|
|
|
1127 // Similar to above but see if current stackpoint is out of the guard area
|
|
|
1128 // and reguard if possible.
|
|
|
1129 bool reguard_stack(void);
|
|
|
1130
|
|
|
1131 // Misc. accessors/mutators
|
|
|
1132 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
|
|
|
1133 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
|
|
|
1134 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
|
|
|
1135
|
|
|
1136 #ifndef PRODUCT
|
|
|
1137 void record_jump(address target, address instr, const char* file, int line);
|
|
|
1138 #endif /* PRODUCT */
|
|
|
1139
|
|
|
1140 // For assembly stub generation
|
|
|
1141 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
|
|
|
1142 #ifndef PRODUCT
|
|
|
1143 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
|
|
|
1144 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
|
|
|
1145 #endif /* PRODUCT */
|
|
|
1146 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
|
|
|
1147 static ByteSize last_Java_sp_offset() {
|
|
|
1148 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
|
|
|
1149 }
|
|
|
1150 static ByteSize last_Java_pc_offset() {
|
|
|
1151 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
|
|
|
1152 }
|
|
|
1153 static ByteSize frame_anchor_offset() {
|
|
|
1154 return byte_offset_of(JavaThread, _anchor);
|
|
|
1155 }
|
|
|
1156 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
|
|
|
1157 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
|
|
|
1158 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
|
|
|
1159 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
|
|
|
1160 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
|
|
|
1161 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
|
|
|
1162 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
|
|
|
1163 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
|
|
|
1164 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
|
|
|
1165 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); }
|
|
|
1166 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
|
|
|
1167 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
|
|
|
1168
|
|
|
1169 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
|
|
|
1170
|
|
|
1171 // Returns the jni environment for this thread
|
|
|
1172 JNIEnv* jni_environment() { return &_jni_environment; }
|
|
|
1173
|
|
|
1174 static JavaThread* thread_from_jni_environment(JNIEnv* env) {
|
|
|
1175 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
|
|
|
1176 // Only return NULL if thread is off the thread list; starting to
|
|
|
1177 // exit should not return NULL.
|
|
|
1178 if (thread_from_jni_env->is_terminated()) {
|
|
|
1179 thread_from_jni_env->block_if_vm_exited();
|
|
|
1180 return NULL;
|
|
|
1181 } else {
|
|
|
1182 return thread_from_jni_env;
|
|
|
1183 }
|
|
|
1184 }
|
|
|
1185
|
|
|
1186 // JNI critical regions. These can nest.
|
|
|
1187 bool in_critical() { return _jni_active_critical > 0; }
|
|
|
1188 void enter_critical() { assert(Thread::current() == this,
|
|
|
1189 "this must be current thread");
|
|
|
1190 _jni_active_critical++; }
|
|
|
1191 void exit_critical() { assert(Thread::current() == this,
|
|
|
1192 "this must be current thread");
|
|
|
1193 _jni_active_critical--;
|
|
|
1194 assert(_jni_active_critical >= 0,
|
|
|
1195 "JNI critical nesting problem?"); }
|
|
|
1196
|
|
|
1197 // For deadlock detection
|
|
|
1198 int depth_first_number() { return _depth_first_number; }
|
|
|
1199 void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
|
|
|
1200
|
|
|
1201 private:
|
|
|
1202 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
|
|
|
1203
|
|
|
1204 public:
|
|
|
1205 MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
|
|
|
1206 void add_monitor_chunk(MonitorChunk* chunk);
|
|
|
1207 void remove_monitor_chunk(MonitorChunk* chunk);
|
|
|
1208 bool in_deopt_handler() const { return _in_deopt_handler > 0; }
|
|
|
1209 void inc_in_deopt_handler() { _in_deopt_handler++; }
|
|
|
1210 void dec_in_deopt_handler() {
|
|
|
1211 assert(_in_deopt_handler > 0, "mismatched deopt nesting");
|
|
|
1212 if (_in_deopt_handler > 0) { // robustness
|
|
|
1213 _in_deopt_handler--;
|
|
|
1214 }
|
|
|
1215 }
|
|
|
1216
|
|
|
1217 private:
|
|
|
1218 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
|
|
|
1219
|
|
|
1220 public:
|
|
|
1221
|
|
|
1222 // Frame iteration; calls the function f for all frames on the stack
|
|
|
1223 void frames_do(void f(frame*, const RegisterMap*));
|
|
|
1224
|
|
|
1225 // Memory operations
|
|
|
1226 void oops_do(OopClosure* f);
|
|
|
1227
|
|
|
1228 // Sweeper operations
|
|
|
1229 void nmethods_do();
|
|
|
1230
|
|
|
1231 // Memory management operations
|
|
|
1232 void gc_epilogue();
|
|
|
1233 void gc_prologue();
|
|
|
1234
|
|
|
1235 // Misc. operations
|
|
|
1236 char* name() const { return (char*)get_thread_name(); }
|
|
|
1237 void print_on(outputStream* st) const;
|
|
|
1238 void print() const { print_on(tty); }
|
|
|
1239 void print_value();
|
|
|
1240 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
|
|
|
1241 void print_thread_state() const PRODUCT_RETURN;
|
|
|
1242 void print_on_error(outputStream* st, char* buf, int buflen) const;
|
|
|
1243 void verify();
|
|
|
1244 const char* get_thread_name() const;
|
|
|
1245 private:
|
|
|
1246 // factor out low-level mechanics for use in both normal and error cases
|
|
|
1247 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
|
|
|
1248 public:
|
|
|
1249 const char* get_threadgroup_name() const;
|
|
|
1250 const char* get_parent_name() const;
|
|
|
1251
|
|
|
1252 // Accessing frames
|
|
|
1253 frame last_frame() {
|
|
|
1254 _anchor.make_walkable(this);
|
|
|
1255 return pd_last_frame();
|
|
|
1256 }
|
|
|
1257 javaVFrame* last_java_vframe(RegisterMap* reg_map);
|
|
|
1258
|
|
|
1259 // Returns method at 'depth' java or native frames down the stack
|
|
|
1260 // Used for security checks
|
|
|
1261 klassOop security_get_caller_class(int depth);
|
|
|
1262
|
|
|
1263 // Print stack trace in external format
|
|
|
1264 void print_stack_on(outputStream* st);
|
|
|
1265 void print_stack() { print_stack_on(tty); }
|
|
|
1266
|
|
|
1267 // Print stack traces in various internal formats
|
|
|
1268 void trace_stack() PRODUCT_RETURN;
|
|
|
1269 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
|
|
|
1270 void trace_frames() PRODUCT_RETURN;
|
|
|
1271
|
|
|
1272 // Returns the number of stack frames on the stack
|
|
|
1273 int depth() const;
|
|
|
1274
|
|
|
1275 // Function for testing deoptimization
|
|
|
1276 void deoptimize();
|
|
|
1277 void make_zombies();
|
|
|
1278
|
|
|
1279 void deoptimized_wrt_marked_nmethods();
|
|
|
1280
|
|
|
1281 // Profiling operation (see fprofile.cpp)
|
|
|
1282 public:
|
|
|
1283 bool profile_last_Java_frame(frame* fr);
|
|
|
1284
|
|
|
1285 private:
|
|
|
1286 ThreadProfiler* _thread_profiler;
|
|
|
1287 private:
|
|
|
1288 friend class FlatProfiler; // uses both [gs]et_thread_profiler.
|
|
|
1289 friend class FlatProfilerTask; // uses get_thread_profiler.
|
|
|
1290 friend class ThreadProfilerMark; // uses get_thread_profiler.
|
|
|
1291 ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
|
|
|
1292 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
|
|
|
1293 ThreadProfiler* result = _thread_profiler;
|
|
|
1294 _thread_profiler = tp;
|
|
|
1295 return result;
|
|
|
1296 }
|
|
|
1297
|
|
|
1298 // Static operations
|
|
|
1299 public:
|
|
|
1300 // Returns the running thread as a JavaThread
|
|
|
1301 static inline JavaThread* current();
|
|
|
1302
|
|
|
1303 // Returns the active Java thread. Do not use this if you know you are calling
|
|
|
1304 // from a JavaThread, as it's slower than JavaThread::current. If called from
|
|
|
1305 // the VMThread, it also returns the JavaThread that instigated the VMThread's
|
|
|
1306 // operation. You may not want that either.
|
|
|
1307 static JavaThread* active();
|
|
|
1308
|
|
|
1309 inline CompilerThread* as_CompilerThread();
|
|
|
1310
|
|
|
1311 public:
|
|
|
1312 virtual void run();
|
|
|
1313 void thread_main_inner();
|
|
|
1314
|
|
|
1315 private:
|
|
|
1316 // PRIVILEGED STACK
|
|
|
1317 PrivilegedElement* _privileged_stack_top;
|
|
|
1318 GrowableArray<oop>* _array_for_gc;
|
|
|
1319 public:
|
|
|
1320
|
|
|
1321 // Returns the privileged_stack information.
|
|
|
1322 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
|
|
|
1323 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
|
|
|
1324 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
|
|
|
1325
|
|
|
1326 public:
|
|
|
1327 // Thread local information maintained by JVMTI.
|
|
|
1328 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
|
|
|
1329 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
|
|
|
1330 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
|
|
|
1331 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
|
|
|
1332 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
|
|
|
1333
|
|
|
1334 // JVMTI PopFrame support
|
|
|
1335 // Setting and clearing popframe_condition
|
|
|
1336 // All of these enumerated values are bits. popframe_pending
|
|
|
1337 // indicates that a PopFrame() has been requested and not yet been
|
|
|
1338 // completed. popframe_processing indicates that that PopFrame() is in
|
|
|
1339 // the process of being completed. popframe_force_deopt_reexecution_bit
|
|
|
1340 // indicates that special handling is required when returning to a
|
|
|
1341 // deoptimized caller.
|
|
|
1342 enum PopCondition {
|
|
|
1343 popframe_inactive = 0x00,
|
|
|
1344 popframe_pending_bit = 0x01,
|
|
|
1345 popframe_processing_bit = 0x02,
|
|
|
1346 popframe_force_deopt_reexecution_bit = 0x04
|
|
|
1347 };
|
|
|
1348 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
|
|
|
1349 void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
|
|
|
1350 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
|
|
|
1351 void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
|
|
|
1352 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
|
|
|
1353 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
|
|
|
1354 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
|
|
|
1355 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
|
|
|
1356 #ifdef CC_INTERP
|
|
|
1357 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
|
|
|
1358 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
|
|
|
1359 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
|
|
|
1360 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
|
|
|
1361 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
|
|
|
1362 #endif
|
|
|
1363
|
|
|
1364 private:
|
|
|
1365 // Saved incoming arguments to popped frame.
|
|
|
1366 // Used only when popped interpreted frame returns to deoptimized frame.
|
|
|
1367 void* _popframe_preserved_args;
|
|
|
1368 int _popframe_preserved_args_size;
|
|
|
1369
|
|
|
1370 public:
|
|
|
1371 void popframe_preserve_args(ByteSize size_in_bytes, void* start);
|
|
|
1372 void* popframe_preserved_args();
|
|
|
1373 ByteSize popframe_preserved_args_size();
|
|
|
1374 WordSize popframe_preserved_args_size_in_words();
|
|
|
1375 void popframe_free_preserved_args();
|
|
|
1376
|
|
|
1377
|
|
|
1378 private:
|
|
|
1379 JvmtiThreadState *_jvmti_thread_state;
|
|
|
1380 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
|
|
|
1381
|
|
|
1382 // Used by the interpreter in fullspeed mode for frame pop, method
|
|
|
1383 // entry, method exit and single stepping support. This field is
|
|
|
1384 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
|
|
|
1385 // It can be set to zero asynchronously (i.e., without a VM operation
|
|
|
1386 // or a lock) so we have to be very careful.
|
|
|
1387 int _interp_only_mode;
|
|
|
1388
|
|
|
1389 public:
|
|
|
1390 // used by the interpreter for fullspeed debugging support (see above)
|
|
|
1391 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
|
|
|
1392 bool is_interp_only_mode() { return (_interp_only_mode != 0); }
|
|
|
1393 int get_interp_only_mode() { return _interp_only_mode; }
|
|
|
1394 void increment_interp_only_mode() { ++_interp_only_mode; }
|
|
|
1395 void decrement_interp_only_mode() { --_interp_only_mode; }
|
|
|
1396
|
|
|
1397 private:
|
|
|
1398 ThreadStatistics *_thread_stat;
|
|
|
1399
|
|
|
1400 public:
|
|
|
1401 ThreadStatistics* get_thread_stat() const { return _thread_stat; }
|
|
|
1402
|
|
|
1403 // Return a blocker object for which this thread is blocked parking.
|
|
|
1404 oop current_park_blocker();
|
|
|
1405
|
|
|
1406 private:
|
|
|
1407 static size_t _stack_size_at_create;
|
|
|
1408
|
|
|
1409 public:
|
|
|
1410 static inline size_t stack_size_at_create(void) {
|
|
|
1411 return _stack_size_at_create;
|
|
|
1412 }
|
|
|
1413 static inline void set_stack_size_at_create(size_t value) {
|
|
|
1414 _stack_size_at_create = value;
|
|
|
1415 }
|
|
|
1416
|
|
|
1417 // Machine dependent stuff
|
|
|
1418 #include "incls/_thread_pd.hpp.incl"
|
|
|
1419
|
|
|
1420 public:
|
|
|
1421 void set_blocked_on_compilation(bool value) {
|
|
|
1422 _blocked_on_compilation = value;
|
|
|
1423 }
|
|
|
1424
|
|
|
1425 bool blocked_on_compilation() {
|
|
|
1426 return _blocked_on_compilation;
|
|
|
1427 }
|
|
|
1428 protected:
|
|
|
1429 bool _blocked_on_compilation;
|
|
|
1430
|
|
|
1431
|
|
|
1432 // JSR166 per-thread parker
|
|
|
1433 private:
|
|
|
1434 Parker* _parker;
|
|
|
1435 public:
|
|
|
1436 Parker* parker() { return _parker; }
|
|
|
1437
|
|
|
1438 // Biased locking support
|
|
|
1439 private:
|
|
|
1440 GrowableArray<MonitorInfo*>* _cached_monitor_info;
|
|
|
1441 public:
|
|
|
1442 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
|
|
|
1443 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
|
|
|
1444
|
|
|
1445 // clearing/querying jni attach status
|
|
|
1446 bool is_attaching() const { return _is_attaching; }
|
|
|
1447 void set_attached() { _is_attaching = false; OrderAccess::fence(); }
|
|
|
1448 };
|
|
|
1449
|
|
|
1450 // Inline implementation of JavaThread::current
|
|
|
1451 inline JavaThread* JavaThread::current() {
|
|
|
1452 Thread* thread = ThreadLocalStorage::thread();
|
|
|
1453 assert(thread != NULL && thread->is_Java_thread(), "just checking");
|
|
|
1454 return (JavaThread*)thread;
|
|
|
1455 }
|
|
|
1456
|
|
|
1457 inline CompilerThread* JavaThread::as_CompilerThread() {
|
|
|
1458 assert(is_Compiler_thread(), "just checking");
|
|
|
1459 return (CompilerThread*)this;
|
|
|
1460 }
|
|
|
1461
|
|
|
1462 inline bool JavaThread::stack_yellow_zone_disabled() {
|
|
|
1463 return _stack_guard_state == stack_guard_yellow_disabled;
|
|
|
1464 }
|
|
|
1465
|
|
|
1466 inline bool JavaThread::stack_yellow_zone_enabled() {
|
|
|
1467 #ifdef ASSERT
|
|
|
1468 if (os::uses_stack_guard_pages()) {
|
|
|
1469 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
|
|
|
1470 }
|
|
|
1471 #endif
|
|
|
1472 return _stack_guard_state == stack_guard_enabled;
|
|
|
1473 }
|
|
|
1474
|
|
|
1475 inline size_t JavaThread::stack_available(address cur_sp) {
|
|
|
1476 // This code assumes java stacks grow down
|
|
|
1477 address low_addr; // Limit on the address for deepest stack depth
|
|
|
1478 if ( _stack_guard_state == stack_guard_unused) {
|
|
|
1479 low_addr = stack_base() - stack_size();
|
|
|
1480 } else {
|
|
|
1481 low_addr = stack_yellow_zone_base();
|
|
|
1482 }
|
|
|
1483 return cur_sp > low_addr ? cur_sp - low_addr : 0;
|
|
|
1484 }
|
|
|
1485
|
|
|
1486 // A JavaThread for low memory detection support
|
|
|
1487 class LowMemoryDetectorThread : public JavaThread {
|
|
|
1488 friend class VMStructs;
|
|
|
1489 public:
|
|
|
1490 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {};
|
|
|
1491
|
|
|
1492 // Hide this thread from external view.
|
|
|
1493 bool is_hidden_from_external_view() const { return true; }
|
|
|
1494 };
|
|
|
1495
|
|
|
1496 // A thread used for Compilation.
|
|
|
1497 class CompilerThread : public JavaThread {
|
|
|
1498 friend class VMStructs;
|
|
|
1499 private:
|
|
|
1500 CompilerCounters* _counters;
|
|
|
1501
|
|
|
1502 ciEnv* _env;
|
|
|
1503 CompileLog* _log;
|
|
|
1504 CompileTask* _task;
|
|
|
1505 CompileQueue* _queue;
|
|
|
1506
|
|
|
1507 public:
|
|
|
1508
|
|
|
1509 static CompilerThread* current();
|
|
|
1510
|
|
|
1511 CompilerThread(CompileQueue* queue, CompilerCounters* counters);
|
|
|
1512
|
|
|
1513 bool is_Compiler_thread() const { return true; }
|
|
|
1514 // Hide this compiler thread from external view.
|
|
|
1515 bool is_hidden_from_external_view() const { return true; }
|
|
|
1516
|
|
|
1517 CompileQueue* queue() { return _queue; }
|
|
|
1518 CompilerCounters* counters() { return _counters; }
|
|
|
1519
|
|
|
1520 // Get/set the thread's compilation environment.
|
|
|
1521 ciEnv* env() { return _env; }
|
|
|
1522 void set_env(ciEnv* env) { _env = env; }
|
|
|
1523
|
|
|
1524 // Get/set the thread's logging information
|
|
|
1525 CompileLog* log() { return _log; }
|
|
|
1526 void init_log(CompileLog* log) {
|
|
|
1527 // Set once, for good.
|
|
|
1528 assert(_log == NULL, "set only once");
|
|
|
1529 _log = log;
|
|
|
1530 }
|
|
|
1531
|
|
|
1532 #ifndef PRODUCT
|
|
|
1533 private:
|
|
|
1534 IdealGraphPrinter *_ideal_graph_printer;
|
|
|
1535 public:
|
|
|
1536 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
|
|
|
1537 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
|
|
|
1538 #endif
|
|
|
1539
|
|
|
1540 // Get/set the thread's current task
|
|
|
1541 CompileTask* task() { return _task; }
|
|
|
1542 void set_task(CompileTask* task) { _task = task; }
|
|
|
1543 };
|
|
|
1544
|
|
|
1545 inline CompilerThread* CompilerThread::current() {
|
|
|
1546 return JavaThread::current()->as_CompilerThread();
|
|
|
1547 }
|
|
|
1548
|
|
|
1549
|
|
|
1550 // The active thread queue. It also keeps track of the current used
|
|
|
1551 // thread priorities.
|
|
|
1552 class Threads: AllStatic {
|
|
|
1553 friend class VMStructs;
|
|
|
1554 private:
|
|
|
1555 static JavaThread* _thread_list;
|
|
|
1556 static int _number_of_threads;
|
|
|
1557 static int _number_of_non_daemon_threads;
|
|
|
1558 static int _return_code;
|
|
|
1559
|
|
|
1560 public:
|
|
|
1561 // Thread management
|
|
|
1562 // force_daemon is a concession to JNI, where we may need to add a
|
|
|
1563 // thread to the thread list before allocating its thread object
|
|
|
1564 static void add(JavaThread* p, bool force_daemon = false);
|
|
|
1565 static void remove(JavaThread* p);
|
|
|
1566 static bool includes(JavaThread* p);
|
|
|
1567 static JavaThread* first() { return _thread_list; }
|
|
|
1568 static void threads_do(ThreadClosure* tc);
|
|
|
1569
|
|
|
1570 // Initializes the vm and creates the vm thread
|
|
|
1571 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
|
|
|
1572 static void convert_vm_init_libraries_to_agents();
|
|
|
1573 static void create_vm_init_libraries();
|
|
|
1574 static void create_vm_init_agents();
|
|
|
1575 static void shutdown_vm_agents();
|
|
|
1576 static bool destroy_vm();
|
|
|
1577 // Supported VM versions via JNI
|
|
|
1578 // Includes JNI_VERSION_1_1
|
|
|
1579 static jboolean is_supported_jni_version_including_1_1(jint version);
|
|
|
1580 // Does not include JNI_VERSION_1_1
|
|
|
1581 static jboolean is_supported_jni_version(jint version);
|
|
|
1582
|
|
|
1583 // Garbage collection
|
|
|
1584 static void follow_other_roots(void f(oop*));
|
|
|
1585
|
|
|
1586 // Apply "f->do_oop" to all root oops in all threads.
|
|
|
1587 // This version may only be called by sequential code.
|
|
|
1588 static void oops_do(OopClosure* f);
|
|
|
1589 // This version may be called by sequential or parallel code.
|
|
|
1590 static void possibly_parallel_oops_do(OopClosure* f);
|
|
|
1591 // This creates a list of GCTasks, one per thread.
|
|
|
1592 static void create_thread_roots_tasks(GCTaskQueue* q);
|
|
|
1593 // This creates a list of GCTasks, one per thread, for marking objects.
|
|
|
1594 static void create_thread_roots_marking_tasks(GCTaskQueue* q);
|
|
|
1595
|
|
|
1596 // Apply "f->do_oop" to roots in all threads that
|
|
|
1597 // are part of compiled frames
|
|
|
1598 static void compiled_frame_oops_do(OopClosure* f);
|
|
|
1599
|
|
|
1600 static void convert_hcode_pointers();
|
|
|
1601 static void restore_hcode_pointers();
|
|
|
1602
|
|
|
1603 // Sweeper
|
|
|
1604 static void nmethods_do();
|
|
|
1605
|
|
|
1606 static void gc_epilogue();
|
|
|
1607 static void gc_prologue();
|
|
|
1608
|
|
|
1609 // Verification
|
|
|
1610 static void verify();
|
|
|
1611 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
|
|
|
1612 static void print(bool print_stacks, bool internal_format) {
|
|
|
1613 // this function is only used by debug.cpp
|
|
|
1614 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
|
|
|
1615 }
|
|
|
1616 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
|
|
|
1617
|
|
|
1618 // Get Java threads that are waiting to enter a monitor. If doLock
|
|
|
1619 // is true, then Threads_lock is grabbed as needed. Otherwise, the
|
|
|
1620 // VM needs to be at a safepoint.
|
|
|
1621 static GrowableArray<JavaThread*>* get_pending_threads(int count,
|
|
|
1622 address monitor, bool doLock);
|
|
|
1623
|
|
|
1624 // Get owning Java thread from the monitor's owner field. If doLock
|
|
|
1625 // is true, then Threads_lock is grabbed as needed. Otherwise, the
|
|
|
1626 // VM needs to be at a safepoint.
|
|
|
1627 static JavaThread *owning_thread_from_monitor_owner(address owner,
|
|
|
1628 bool doLock);
|
|
|
1629
|
|
|
1630 // Number of threads on the active threads list
|
|
|
1631 static int number_of_threads() { return _number_of_threads; }
|
|
|
1632 // Number of non-daemon threads on the active threads list
|
|
|
1633 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
|
|
|
1634
|
|
|
1635 // Deoptimizes all frames tied to marked nmethods
|
|
|
1636 static void deoptimized_wrt_marked_nmethods();
|
|
|
1637
|
|
|
1638 };
|
|
|
1639
|
|
|
1640
|
|
|
1641 // Thread iterator
|
|
|
1642 class ThreadClosure: public StackObj {
|
|
|
1643 public:
|
|
|
1644 virtual void do_thread(Thread* thread) = 0;
|
|
|
1645 };
|
|
|
1646
|
|
|
1647 class SignalHandlerMark: public StackObj {
|
|
|
1648 private:
|
|
|
1649 Thread* _thread;
|
|
|
1650 public:
|
|
|
1651 SignalHandlerMark(Thread* t) {
|
|
|
1652 _thread = t;
|
|
|
1653 if (_thread) _thread->enter_signal_handler();
|
|
|
1654 }
|
|
|
1655 ~SignalHandlerMark() {
|
|
|
1656 if (_thread) _thread->leave_signal_handler();
|
|
|
1657 _thread = NULL;
|
|
|
1658 }
|
|
|
1659 };
|
|
|
1660
|
|
|
1661 // ParkEvents are type-stable and immortal.
|
|
|
1662 //
|
|
|
1663 // Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains
|
|
|
1664 // associated with the thread for the thread's entire lifetime - the relationship is
|
|
|
1665 // stable. A thread will be associated at most one ParkEvent. When the thread
|
|
|
1666 // expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from
|
|
|
1667 // the EventFreeList before creating a new Event. Type-stability frees us from
|
|
|
1668 // worrying about stale Event or Thread references in the objectMonitor subsystem.
|
|
|
1669 // (A reference to ParkEvent is always valid, even though the event may no longer be associated
|
|
|
1670 // with the desired or expected thread. A key aspect of this design is that the callers of
|
|
|
1671 // park, unpark, etc must tolerate stale references and spurious wakeups).
|
|
|
1672 //
|
|
|
1673 // Only the "associated" thread can block (park) on the ParkEvent, although
|
|
|
1674 // any other thread can unpark a reachable parkevent. Park() is allowed to
|
|
|
1675 // return spuriously. In fact park-unpark a really just an optimization to
|
|
|
1676 // avoid unbounded spinning and surrender the CPU to be a polite system citizen.
|
|
|
1677 // A degenerate albeit "impolite" park-unpark implementation could simply return.
|
|
|
1678 // See http://blogs.sun.com/dave for more details.
|
|
|
1679 //
|
|
|
1680 // Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as
|
|
|
1681 // thread proxies, and simply make the THREAD structure type-stable and persistent.
|
|
|
1682 // Currently, we unpark events associated with threads, but ideally we'd just
|
|
|
1683 // unpark threads.
|
|
|
1684 //
|
|
|
1685 // The base-class, PlatformEvent, is platform-specific while the ParkEvent is
|
|
|
1686 // platform-independent. PlatformEvent provides park(), unpark(), etc., and
|
|
|
1687 // is abstract -- that is, a PlatformEvent should never be instantiated except
|
|
|
1688 // as part of a ParkEvent.
|
|
|
1689 // Equivalently we could have defined a platform-independent base-class that
|
|
|
1690 // exported Allocate(), Release(), etc. The platform-specific class would extend
|
|
|
1691 // that base-class, adding park(), unpark(), etc.
|
|
|
1692 //
|
|
|
1693 // A word of caution: The JVM uses 2 very similar constructs:
|
|
|
1694 // 1. ParkEvent are used for Java-level "monitor" synchronization.
|
|
|
1695 // 2. Parkers are used by JSR166-JUC park-unpark.
|
|
|
1696 //
|
|
|
1697 // We'll want to eventually merge these redundant facilities and use ParkEvent.
|
|
|
1698
|
|
|
1699
|
|
|
1700 class ParkEvent : public os::PlatformEvent {
|
|
|
1701 private:
|
|
|
1702 ParkEvent * FreeNext ;
|
|
|
1703
|
|
|
1704 // Current association
|
|
|
1705 Thread * AssociatedWith ;
|
|
|
1706 intptr_t RawThreadIdentity ; // LWPID etc
|
|
|
1707 volatile int Incarnation ;
|
|
|
1708
|
|
|
1709 // diagnostic : keep track of last thread to wake this thread.
|
|
|
1710 // this is useful for construction of dependency graphs.
|
|
|
1711 void * LastWaker ;
|
|
|
1712
|
|
|
1713 public:
|
|
|
1714 // MCS-CLH list linkage and Native Mutex/Monitor
|
|
|
1715 ParkEvent * volatile ListNext ;
|
|
|
1716 ParkEvent * volatile ListPrev ;
|
|
|
1717 volatile intptr_t OnList ;
|
|
|
1718 volatile int TState ;
|
|
|
1719 volatile int Notified ; // for native monitor construct
|
|
|
1720 volatile int IsWaiting ; // Enqueued on WaitSet
|
|
|
1721
|
|
|
1722
|
|
|
1723 private:
|
|
|
1724 static ParkEvent * volatile FreeList ;
|
|
|
1725 static volatile int ListLock ;
|
|
|
1726
|
|
|
1727 // It's prudent to mark the dtor as "private"
|
|
|
1728 // ensuring that it's not visible outside the package.
|
|
|
1729 // Unfortunately gcc warns about such usage, so
|
|
|
1730 // we revert to the less desirable "protected" visibility.
|
|
|
1731 // The other compilers accept private dtors.
|
|
|
1732
|
|
|
1733 protected: // Ensure dtor is never invoked
|
|
|
1734 ~ParkEvent() { guarantee (0, "invariant") ; }
|
|
|
1735
|
|
|
1736 ParkEvent() : PlatformEvent() {
|
|
|
1737 AssociatedWith = NULL ;
|
|
|
1738 FreeNext = NULL ;
|
|
|
1739 ListNext = NULL ;
|
|
|
1740 ListPrev = NULL ;
|
|
|
1741 OnList = 0 ;
|
|
|
1742 TState = 0 ;
|
|
|
1743 Notified = 0 ;
|
|
|
1744 IsWaiting = 0 ;
|
|
|
1745 }
|
|
|
1746
|
|
|
1747 // We use placement-new to force ParkEvent instances to be
|
|
|
1748 // aligned on 256-byte address boundaries. This ensures that the least
|
|
|
1749 // significant byte of a ParkEvent address is always 0.
|
|
|
1750
|
|
|
1751 void * operator new (size_t sz) ;
|
|
|
1752 void operator delete (void * a) ;
|
|
|
1753
|
|
|
1754 public:
|
|
|
1755 static ParkEvent * Allocate (Thread * t) ;
|
|
|
1756 static void Release (ParkEvent * e) ;
|
|
|
1757 } ;
|
