Mercurial > hg > truffle
annotate src/share/vm/code/icBuffer.cpp @ 17716:cdb71841f4bc
6498581: ThreadInterruptTest3 produces wrong output on Windows
Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
| author | minqi |
|---|---|
| date | Wed, 26 Feb 2014 15:20:41 -0800 |
| parents | cd3d6a6b95d9 |
| children | 291ffc492eb6 78bbf4d43a14 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
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26 #include "code/codeCache.hpp" |
| 1972 | 27 #include "code/compiledIC.hpp" |
| 28 #include "code/icBuffer.hpp" | |
| 29 #include "code/nmethod.hpp" | |
| 30 #include "code/scopeDesc.hpp" | |
| 31 #include "gc_interface/collectedHeap.inline.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
| 34 #include "memory/resourceArea.hpp" | |
| 35 #include "memory/universe.inline.hpp" | |
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36 #include "oops/method.hpp" |
| 1972 | 37 #include "oops/oop.inline.hpp" |
| 38 #include "oops/oop.inline2.hpp" | |
| 39 #include "runtime/mutexLocker.hpp" | |
| 40 #include "runtime/stubRoutines.hpp" | |
| 0 | 41 |
| 42 | |
| 43 DEF_STUB_INTERFACE(ICStub); | |
| 44 | |
| 45 StubQueue* InlineCacheBuffer::_buffer = NULL; | |
| 46 ICStub* InlineCacheBuffer::_next_stub = NULL; | |
| 47 | |
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48 CompiledICHolder* InlineCacheBuffer::_pending_released = NULL; |
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49 int InlineCacheBuffer::_pending_count = 0; |
| 0 | 50 |
| 51 void ICStub::finalize() { | |
| 52 if (!is_empty()) { | |
| 53 ResourceMark rm; | |
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54 CompiledIC *ic = CompiledIC_at(CodeCache::find_nmethod(ic_site()), ic_site()); |
| 0 | 55 assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?"); |
| 56 | |
| 57 assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer"); | |
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58 ic->set_ic_destination_and_value(destination(), cached_value()); |
| 0 | 59 } |
| 60 } | |
| 61 | |
| 62 | |
| 63 address ICStub::destination() const { | |
| 64 return InlineCacheBuffer::ic_buffer_entry_point(code_begin()); | |
| 65 } | |
| 66 | |
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67 void* ICStub::cached_value() const { |
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68 return InlineCacheBuffer::ic_buffer_cached_value(code_begin()); |
| 0 | 69 } |
| 70 | |
| 71 | |
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72 void ICStub::set_stub(CompiledIC *ic, void* cached_val, address dest_addr) { |
| 0 | 73 // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we |
| 74 // store the location of the inline cache. Then we have enough information recreate the CompiledIC | |
| 75 // object when we need to remove the stub. | |
| 76 _ic_site = ic->instruction_address(); | |
| 77 | |
| 78 // Assemble new stub | |
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79 InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_val, dest_addr); |
| 0 | 80 assert(destination() == dest_addr, "can recover destination"); |
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81 assert(cached_value() == cached_val, "can recover destination"); |
| 0 | 82 } |
| 83 | |
| 84 | |
| 85 void ICStub::clear() { | |
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86 if (CompiledIC::is_icholder_entry(destination())) { |
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87 InlineCacheBuffer::queue_for_release((CompiledICHolder*)cached_value()); |
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88 } |
| 0 | 89 _ic_site = NULL; |
| 90 } | |
| 91 | |
| 92 | |
| 93 #ifndef PRODUCT | |
| 94 // anybody calling to this stub will trap | |
| 95 | |
| 96 void ICStub::verify() { | |
| 97 } | |
| 98 | |
| 99 void ICStub::print() { | |
| 100 tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site); | |
| 101 } | |
| 102 #endif | |
| 103 | |
| 104 //----------------------------------------------------------------------------------------------- | |
| 105 // Implementation of InlineCacheBuffer | |
| 106 | |
| 107 void InlineCacheBuffer::init_next_stub() { | |
| 108 ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size()); | |
| 109 assert (ic_stub != NULL, "no room for a single stub"); | |
| 110 set_next_stub(ic_stub); | |
| 111 } | |
| 112 | |
| 113 void InlineCacheBuffer::initialize() { | |
| 114 if (_buffer != NULL) return; // already initialized | |
| 115 _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer"); | |
| 116 assert (_buffer != NULL, "cannot allocate InlineCacheBuffer"); | |
| 117 init_next_stub(); | |
| 118 } | |
| 119 | |
| 120 | |
| 121 ICStub* InlineCacheBuffer::new_ic_stub() { | |
| 122 while (true) { | |
| 123 ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size()); | |
| 124 if (ic_stub != NULL) { | |
| 125 return ic_stub; | |
| 126 } | |
| 127 // we ran out of inline cache buffer space; must enter safepoint. | |
| 128 // We do this by forcing a safepoint | |
| 129 EXCEPTION_MARK; | |
| 130 | |
| 131 VM_ForceSafepoint vfs; | |
| 132 VMThread::execute(&vfs); | |
| 133 // We could potential get an async. exception at this point. | |
| 134 // In that case we will rethrow it to ourselvs. | |
| 135 if (HAS_PENDING_EXCEPTION) { | |
| 136 oop exception = PENDING_EXCEPTION; | |
| 137 CLEAR_PENDING_EXCEPTION; | |
| 138 Thread::send_async_exception(JavaThread::current()->threadObj(), exception); | |
| 139 } | |
| 140 } | |
| 141 ShouldNotReachHere(); | |
| 142 return NULL; | |
| 143 } | |
| 144 | |
| 145 | |
| 146 void InlineCacheBuffer::update_inline_caches() { | |
| 147 if (buffer()->number_of_stubs() > 1) { | |
| 148 if (TraceICBuffer) { | |
| 149 tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs()); | |
| 150 } | |
| 151 buffer()->remove_all(); | |
| 152 init_next_stub(); | |
| 153 } | |
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154 release_pending_icholders(); |
| 0 | 155 } |
| 156 | |
| 157 | |
| 158 bool InlineCacheBuffer::contains(address instruction_address) { | |
| 159 return buffer()->contains(instruction_address); | |
| 160 } | |
| 161 | |
| 162 | |
| 163 bool InlineCacheBuffer::is_empty() { | |
| 164 return buffer()->number_of_stubs() == 1; // always has sentinel | |
| 165 } | |
| 166 | |
| 167 | |
| 168 void InlineCacheBuffer_init() { | |
| 169 InlineCacheBuffer::initialize(); | |
| 170 } | |
| 171 | |
| 172 | |
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173 void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, void* cached_value, address entry) { |
| 0 | 174 assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint"); |
| 175 assert (CompiledIC_lock->is_locked(), ""); | |
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176 if (TraceICBuffer) { |
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177 tty->print_cr(" create transition stub for " INTPTR_FORMAT " destination " INTPTR_FORMAT " cached value " INTPTR_FORMAT, |
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178 ic->instruction_address(), entry, cached_value); |
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179 } |
| 0 | 180 |
| 181 // If an transition stub is already associate with the inline cache, then we remove the association. | |
| 182 if (ic->is_in_transition_state()) { | |
| 183 ICStub* old_stub = ICStub_from_destination_address(ic->stub_address()); | |
| 184 old_stub->clear(); | |
| 185 } | |
| 186 | |
| 187 // allocate and initialize new "out-of-line" inline-cache | |
| 188 ICStub* ic_stub = get_next_stub(); | |
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189 ic_stub->set_stub(ic, cached_value, entry); |
| 0 | 190 |
| 191 // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache | |
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192 ic->set_ic_destination(ic_stub); |
| 0 | 193 |
| 194 set_next_stub(new_ic_stub()); // can cause safepoint synchronization | |
| 195 } | |
| 196 | |
| 197 | |
| 198 address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) { | |
| 199 ICStub* stub = ICStub_from_destination_address(ic->stub_address()); | |
| 200 return stub->destination(); | |
| 201 } | |
| 202 | |
| 203 | |
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204 void* InlineCacheBuffer::cached_value_for(CompiledIC *ic) { |
| 0 | 205 ICStub* stub = ICStub_from_destination_address(ic->stub_address()); |
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206 return stub->cached_value(); |
| 0 | 207 } |
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208 |
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209 |
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210 // Free CompiledICHolder*s that are no longer in use |
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211 void InlineCacheBuffer::release_pending_icholders() { |
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212 assert(SafepointSynchronize::is_at_safepoint(), "should only be called during a safepoint"); |
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213 CompiledICHolder* holder = _pending_released; |
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214 _pending_released = NULL; |
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215 while (holder != NULL) { |
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216 CompiledICHolder* next = holder->next(); |
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217 delete holder; |
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218 holder = next; |
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219 _pending_count--; |
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220 } |
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221 assert(_pending_count == 0, "wrong count"); |
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222 } |
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223 |
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224 // Enqueue this icholder for release during the next safepoint. It's |
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225 // not safe to free them until them since they might be visible to |
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226 // another thread. |
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227 void InlineCacheBuffer::queue_for_release(CompiledICHolder* icholder) { |
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228 MutexLockerEx mex(InlineCacheBuffer_lock); |
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229 icholder->set_next(_pending_released); |
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230 _pending_released = icholder; |
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231 _pending_count++; |
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232 if (TraceICBuffer) { |
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233 tty->print_cr("enqueueing icholder " INTPTR_FORMAT " to be freed", icholder); |
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234 } |
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235 } |