Mercurial > hg > truffle
comparison src/share/vm/code/icBuffer.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_icBuffer.cpp.incl" | |
27 | |
28 | |
29 DEF_STUB_INTERFACE(ICStub); | |
30 | |
31 StubQueue* InlineCacheBuffer::_buffer = NULL; | |
32 ICStub* InlineCacheBuffer::_next_stub = NULL; | |
33 | |
34 | |
35 void ICStub::finalize() { | |
36 if (!is_empty()) { | |
37 ResourceMark rm; | |
38 CompiledIC *ic = CompiledIC_at(ic_site()); | |
39 assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?"); | |
40 | |
41 assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer"); | |
42 ic->set_cached_oop(cached_oop()); | |
43 ic->set_ic_destination(destination()); | |
44 } | |
45 } | |
46 | |
47 | |
48 address ICStub::destination() const { | |
49 return InlineCacheBuffer::ic_buffer_entry_point(code_begin()); | |
50 } | |
51 | |
52 oop ICStub::cached_oop() const { | |
53 return InlineCacheBuffer::ic_buffer_cached_oop(code_begin()); | |
54 } | |
55 | |
56 | |
57 void ICStub::set_stub(CompiledIC *ic, oop cached_value, address dest_addr) { | |
58 // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we | |
59 // store the location of the inline cache. Then we have enough information recreate the CompiledIC | |
60 // object when we need to remove the stub. | |
61 _ic_site = ic->instruction_address(); | |
62 | |
63 // Assemble new stub | |
64 InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_value, dest_addr); | |
65 assert(destination() == dest_addr, "can recover destination"); | |
66 assert(cached_oop() == cached_value, "can recover destination"); | |
67 } | |
68 | |
69 | |
70 void ICStub::clear() { | |
71 _ic_site = NULL; | |
72 } | |
73 | |
74 | |
75 #ifndef PRODUCT | |
76 // anybody calling to this stub will trap | |
77 | |
78 void ICStub::verify() { | |
79 } | |
80 | |
81 void ICStub::print() { | |
82 tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site); | |
83 } | |
84 #endif | |
85 | |
86 //----------------------------------------------------------------------------------------------- | |
87 // Implementation of InlineCacheBuffer | |
88 | |
89 void InlineCacheBuffer::init_next_stub() { | |
90 ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size()); | |
91 assert (ic_stub != NULL, "no room for a single stub"); | |
92 set_next_stub(ic_stub); | |
93 } | |
94 | |
95 void InlineCacheBuffer::initialize() { | |
96 if (_buffer != NULL) return; // already initialized | |
97 _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer"); | |
98 assert (_buffer != NULL, "cannot allocate InlineCacheBuffer"); | |
99 init_next_stub(); | |
100 } | |
101 | |
102 | |
103 ICStub* InlineCacheBuffer::new_ic_stub() { | |
104 while (true) { | |
105 ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size()); | |
106 if (ic_stub != NULL) { | |
107 return ic_stub; | |
108 } | |
109 // we ran out of inline cache buffer space; must enter safepoint. | |
110 // We do this by forcing a safepoint | |
111 EXCEPTION_MARK; | |
112 | |
113 VM_ForceSafepoint vfs; | |
114 VMThread::execute(&vfs); | |
115 // We could potential get an async. exception at this point. | |
116 // In that case we will rethrow it to ourselvs. | |
117 if (HAS_PENDING_EXCEPTION) { | |
118 oop exception = PENDING_EXCEPTION; | |
119 CLEAR_PENDING_EXCEPTION; | |
120 Thread::send_async_exception(JavaThread::current()->threadObj(), exception); | |
121 } | |
122 } | |
123 ShouldNotReachHere(); | |
124 return NULL; | |
125 } | |
126 | |
127 | |
128 void InlineCacheBuffer::update_inline_caches() { | |
129 if (buffer()->number_of_stubs() > 1) { | |
130 if (TraceICBuffer) { | |
131 tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs()); | |
132 } | |
133 buffer()->remove_all(); | |
134 init_next_stub(); | |
135 } | |
136 } | |
137 | |
138 | |
139 bool InlineCacheBuffer::contains(address instruction_address) { | |
140 return buffer()->contains(instruction_address); | |
141 } | |
142 | |
143 | |
144 bool InlineCacheBuffer::is_empty() { | |
145 return buffer()->number_of_stubs() == 1; // always has sentinel | |
146 } | |
147 | |
148 | |
149 void InlineCacheBuffer_init() { | |
150 InlineCacheBuffer::initialize(); | |
151 } | |
152 | |
153 | |
154 void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, oop cached_oop, address entry) { | |
155 assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint"); | |
156 assert (CompiledIC_lock->is_locked(), ""); | |
157 assert(cached_oop == NULL || cached_oop->is_perm(), "must belong to perm. space"); | |
158 if (TraceICBuffer) { tty->print_cr(" create transition stub for " INTPTR_FORMAT, ic->instruction_address()); } | |
159 | |
160 // If an transition stub is already associate with the inline cache, then we remove the association. | |
161 if (ic->is_in_transition_state()) { | |
162 ICStub* old_stub = ICStub_from_destination_address(ic->stub_address()); | |
163 old_stub->clear(); | |
164 } | |
165 | |
166 // allocate and initialize new "out-of-line" inline-cache | |
167 ICStub* ic_stub = get_next_stub(); | |
168 ic_stub->set_stub(ic, cached_oop, entry); | |
169 | |
170 // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache | |
171 ic->set_ic_destination(ic_stub->code_begin()); | |
172 | |
173 set_next_stub(new_ic_stub()); // can cause safepoint synchronization | |
174 } | |
175 | |
176 | |
177 address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) { | |
178 ICStub* stub = ICStub_from_destination_address(ic->stub_address()); | |
179 return stub->destination(); | |
180 } | |
181 | |
182 | |
183 oop InlineCacheBuffer::cached_oop_for(CompiledIC *ic) { | |
184 ICStub* stub = ICStub_from_destination_address(ic->stub_address()); | |
185 return stub->cached_oop(); | |
186 } |