Fri, 28 Sep 2012 10:16:29 -0700
Merge
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "code/compiledIC.hpp"
27 #include "code/icBuffer.hpp"
28 #include "code/nmethod.hpp"
29 #include "code/scopeDesc.hpp"
30 #include "gc_interface/collectedHeap.inline.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/oop.inline2.hpp"
38 #include "runtime/mutexLocker.hpp"
39 #include "runtime/stubRoutines.hpp"
40 #ifdef TARGET_ARCH_x86
41 # include "assembler_x86.inline.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "assembler_sparc.inline.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "assembler_zero.inline.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "assembler_arm.inline.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "assembler_ppc.inline.hpp"
54 #endif
57 DEF_STUB_INTERFACE(ICStub);
59 StubQueue* InlineCacheBuffer::_buffer = NULL;
60 ICStub* InlineCacheBuffer::_next_stub = NULL;
62 CompiledICHolder* InlineCacheBuffer::_pending_released = NULL;
63 int InlineCacheBuffer::_pending_count = 0;
65 void ICStub::finalize() {
66 if (!is_empty()) {
67 ResourceMark rm;
68 CompiledIC *ic = CompiledIC_at(CodeCache::find_nmethod(ic_site()), ic_site());
69 assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?");
71 assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer");
72 ic->set_ic_destination_and_value(destination(), cached_value());
73 }
74 }
77 address ICStub::destination() const {
78 return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
79 }
81 void* ICStub::cached_value() const {
82 return InlineCacheBuffer::ic_buffer_cached_value(code_begin());
83 }
86 void ICStub::set_stub(CompiledIC *ic, void* cached_val, address dest_addr) {
87 // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we
88 // store the location of the inline cache. Then we have enough information recreate the CompiledIC
89 // object when we need to remove the stub.
90 _ic_site = ic->instruction_address();
92 // Assemble new stub
93 InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_val, dest_addr);
94 assert(destination() == dest_addr, "can recover destination");
95 assert(cached_value() == cached_val, "can recover destination");
96 }
99 void ICStub::clear() {
100 if (CompiledIC::is_icholder_entry(destination())) {
101 InlineCacheBuffer::queue_for_release((CompiledICHolder*)cached_value());
102 }
103 _ic_site = NULL;
104 }
107 #ifndef PRODUCT
108 // anybody calling to this stub will trap
110 void ICStub::verify() {
111 }
113 void ICStub::print() {
114 tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site);
115 }
116 #endif
118 //-----------------------------------------------------------------------------------------------
119 // Implementation of InlineCacheBuffer
121 void InlineCacheBuffer::init_next_stub() {
122 ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size());
123 assert (ic_stub != NULL, "no room for a single stub");
124 set_next_stub(ic_stub);
125 }
127 void InlineCacheBuffer::initialize() {
128 if (_buffer != NULL) return; // already initialized
129 _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer");
130 assert (_buffer != NULL, "cannot allocate InlineCacheBuffer");
131 init_next_stub();
132 }
135 ICStub* InlineCacheBuffer::new_ic_stub() {
136 while (true) {
137 ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size());
138 if (ic_stub != NULL) {
139 return ic_stub;
140 }
141 // we ran out of inline cache buffer space; must enter safepoint.
142 // We do this by forcing a safepoint
143 EXCEPTION_MARK;
145 VM_ForceSafepoint vfs;
146 VMThread::execute(&vfs);
147 // We could potential get an async. exception at this point.
148 // In that case we will rethrow it to ourselvs.
149 if (HAS_PENDING_EXCEPTION) {
150 oop exception = PENDING_EXCEPTION;
151 CLEAR_PENDING_EXCEPTION;
152 Thread::send_async_exception(JavaThread::current()->threadObj(), exception);
153 }
154 }
155 ShouldNotReachHere();
156 return NULL;
157 }
160 void InlineCacheBuffer::update_inline_caches() {
161 if (buffer()->number_of_stubs() > 1) {
162 if (TraceICBuffer) {
163 tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs());
164 }
165 buffer()->remove_all();
166 init_next_stub();
167 }
168 release_pending_icholders();
169 }
172 bool InlineCacheBuffer::contains(address instruction_address) {
173 return buffer()->contains(instruction_address);
174 }
177 bool InlineCacheBuffer::is_empty() {
178 return buffer()->number_of_stubs() == 1; // always has sentinel
179 }
182 void InlineCacheBuffer_init() {
183 InlineCacheBuffer::initialize();
184 }
187 void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, void* cached_value, address entry) {
188 assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
189 assert (CompiledIC_lock->is_locked(), "");
190 if (TraceICBuffer) {
191 tty->print_cr(" create transition stub for " INTPTR_FORMAT " destination " INTPTR_FORMAT " cached value " INTPTR_FORMAT,
192 ic->instruction_address(), entry, cached_value);
193 }
195 // If an transition stub is already associate with the inline cache, then we remove the association.
196 if (ic->is_in_transition_state()) {
197 ICStub* old_stub = ICStub_from_destination_address(ic->stub_address());
198 old_stub->clear();
199 }
201 // allocate and initialize new "out-of-line" inline-cache
202 ICStub* ic_stub = get_next_stub();
203 ic_stub->set_stub(ic, cached_value, entry);
205 // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
206 ic->set_ic_destination(ic_stub);
208 set_next_stub(new_ic_stub()); // can cause safepoint synchronization
209 }
212 address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) {
213 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
214 return stub->destination();
215 }
218 void* InlineCacheBuffer::cached_value_for(CompiledIC *ic) {
219 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
220 return stub->cached_value();
221 }
224 // Free CompiledICHolder*s that are no longer in use
225 void InlineCacheBuffer::release_pending_icholders() {
226 assert(SafepointSynchronize::is_at_safepoint(), "should only be called during a safepoint");
227 CompiledICHolder* holder = _pending_released;
228 _pending_released = NULL;
229 while (holder != NULL) {
230 CompiledICHolder* next = holder->next();
231 delete holder;
232 holder = next;
233 _pending_count--;
234 }
235 assert(_pending_count == 0, "wrong count");
236 }
238 // Enqueue this icholder for release during the next safepoint. It's
239 // not safe to free them until them since they might be visible to
240 // another thread.
241 void InlineCacheBuffer::queue_for_release(CompiledICHolder* icholder) {
242 MutexLockerEx mex(InlineCacheBuffer_lock);
243 icholder->set_next(_pending_released);
244 _pending_released = icholder;
245 _pending_count++;
246 if (TraceICBuffer) {
247 tty->print_cr("enqueueing icholder " INTPTR_FORMAT " to be freed", icholder);
248 }
249 }