Mercurial > hg > graal-compiler
annotate src/share/vm/code/vtableStubs.cpp @ 1847:a932f331ef90
6991065: missed a review comment in 6829194
Reviewed-by: kvn
author | twisti |
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date | Tue, 12 Oct 2010 02:21:06 -0700 |
parents | 3e8fbc61cee8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2010, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_vtableStubs.cpp.incl" | |
27 | |
28 // ----------------------------------------------------------------------------------------- | |
29 // Implementation of VtableStub | |
30 | |
31 address VtableStub::_chunk = NULL; | |
32 address VtableStub::_chunk_end = NULL; | |
33 VMReg VtableStub::_receiver_location = VMRegImpl::Bad(); | |
34 | |
35 static int num_vtable_chunks = 0; | |
36 | |
37 | |
38 void* VtableStub::operator new(size_t size, int code_size) { | |
39 assert(size == sizeof(VtableStub), "mismatched size"); | |
40 num_vtable_chunks++; | |
41 // compute real VtableStub size (rounded to nearest word) | |
42 const int real_size = round_to(code_size + sizeof(VtableStub), wordSize); | |
43 // malloc them in chunks to minimize header overhead | |
44 const int chunk_factor = 32; | |
45 if (_chunk == NULL || _chunk + real_size > _chunk_end) { | |
46 const int bytes = chunk_factor * real_size + pd_code_alignment(); | |
47 BufferBlob* blob = BufferBlob::create("vtable chunks", bytes); | |
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48 if (blob == NULL) { |
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49 vm_exit_out_of_memory(bytes, "CodeCache: no room for vtable chunks"); |
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50 } |
1748 | 51 _chunk = blob->content_begin(); |
0 | 52 _chunk_end = _chunk + bytes; |
53 Forte::register_stub("vtable stub", _chunk, _chunk_end); | |
54 // Notify JVMTI about this stub. The event will be recorded by the enclosing | |
55 // JvmtiDynamicCodeEventCollector and posted when this thread has released | |
56 // all locks. | |
57 if (JvmtiExport::should_post_dynamic_code_generated()) { | |
58 JvmtiExport::post_dynamic_code_generated_while_holding_locks("vtable stub", _chunk, _chunk_end); | |
59 } | |
60 align_chunk(); | |
61 } | |
62 assert(_chunk + real_size <= _chunk_end, "bad allocation"); | |
63 void* res = _chunk; | |
64 _chunk += real_size; | |
65 align_chunk(); | |
66 return res; | |
67 } | |
68 | |
69 | |
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70 void VtableStub::print_on(outputStream* st) const { |
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71 st->print("vtable stub (index = %d, receiver_location = %d, code = [" INTPTR_FORMAT ", " INTPTR_FORMAT "[)", |
0 | 72 index(), receiver_location(), code_begin(), code_end()); |
73 } | |
74 | |
75 | |
76 // ----------------------------------------------------------------------------------------- | |
77 // Implementation of VtableStubs | |
78 // | |
79 // For each hash value there's a linked list of vtable stubs (with that | |
80 // hash value). Each list is anchored in a little hash _table, indexed | |
81 // by that hash value. | |
82 | |
83 VtableStub* VtableStubs::_table[VtableStubs::N]; | |
84 int VtableStubs::_number_of_vtable_stubs = 0; | |
85 | |
86 | |
87 void VtableStubs::initialize() { | |
88 VtableStub::_receiver_location = SharedRuntime::name_for_receiver(); | |
89 { | |
90 MutexLocker ml(VtableStubs_lock); | |
91 assert(_number_of_vtable_stubs == 0, "potential performance bug: VtableStubs initialized more than once"); | |
92 assert(is_power_of_2(N), "N must be a power of 2"); | |
93 for (int i = 0; i < N; i++) { | |
94 _table[i] = NULL; | |
95 } | |
96 } | |
97 } | |
98 | |
99 | |
100 address VtableStubs::create_stub(bool is_vtable_stub, int vtable_index, methodOop method) { | |
101 assert(vtable_index >= 0, "must be positive"); | |
102 | |
103 VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL; | |
104 if (s == NULL) { | |
105 if (is_vtable_stub) { | |
106 s = create_vtable_stub(vtable_index); | |
107 } else { | |
108 s = create_itable_stub(vtable_index); | |
109 } | |
110 enter(is_vtable_stub, vtable_index, s); | |
111 if (PrintAdapterHandlers) { | |
112 tty->print_cr("Decoding VtableStub %s[%d]@%d", | |
113 is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location()); | |
114 Disassembler::decode(s->code_begin(), s->code_end()); | |
115 } | |
116 } | |
117 return s->entry_point(); | |
118 } | |
119 | |
120 | |
121 inline uint VtableStubs::hash(bool is_vtable_stub, int vtable_index){ | |
122 // Assumption: receiver_location < 4 in most cases. | |
123 int hash = ((vtable_index << 2) ^ VtableStub::receiver_location()->value()) + vtable_index; | |
124 return (is_vtable_stub ? ~hash : hash) & mask; | |
125 } | |
126 | |
127 | |
128 VtableStub* VtableStubs::lookup(bool is_vtable_stub, int vtable_index) { | |
129 MutexLocker ml(VtableStubs_lock); | |
130 unsigned hash = VtableStubs::hash(is_vtable_stub, vtable_index); | |
131 VtableStub* s = _table[hash]; | |
132 while( s && !s->matches(is_vtable_stub, vtable_index)) s = s->next(); | |
133 return s; | |
134 } | |
135 | |
136 | |
137 void VtableStubs::enter(bool is_vtable_stub, int vtable_index, VtableStub* s) { | |
138 MutexLocker ml(VtableStubs_lock); | |
139 assert(s->matches(is_vtable_stub, vtable_index), "bad vtable stub"); | |
140 unsigned int h = VtableStubs::hash(is_vtable_stub, vtable_index); | |
141 // enter s at the beginning of the corresponding list | |
142 s->set_next(_table[h]); | |
143 _table[h] = s; | |
144 _number_of_vtable_stubs++; | |
145 } | |
146 | |
147 | |
148 bool VtableStubs::is_entry_point(address pc) { | |
149 MutexLocker ml(VtableStubs_lock); | |
150 VtableStub* stub = (VtableStub*)(pc - VtableStub::entry_offset()); | |
151 uint hash = VtableStubs::hash(stub->is_vtable_stub(), stub->index()); | |
152 VtableStub* s; | |
153 for (s = _table[hash]; s != NULL && s != stub; s = s->next()) {} | |
154 return s == stub; | |
155 } | |
156 | |
157 | |
158 bool VtableStubs::contains(address pc) { | |
159 // simple solution for now - we may want to use | |
160 // a faster way if this function is called often | |
161 return stub_containing(pc) != NULL; | |
162 } | |
163 | |
164 | |
165 VtableStub* VtableStubs::stub_containing(address pc) { | |
166 // Note: No locking needed since any change to the data structure | |
167 // happens with an atomic store into it (we don't care about | |
168 // consistency with the _number_of_vtable_stubs counter). | |
169 for (int i = 0; i < N; i++) { | |
170 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) { | |
171 if (s->contains(pc)) return s; | |
172 } | |
173 } | |
174 return NULL; | |
175 } | |
176 | |
177 void vtableStubs_init() { | |
178 VtableStubs::initialize(); | |
179 } | |
180 | |
181 | |
182 //----------------------------------------------------------------------------------------------------- | |
183 // Non-product code | |
184 #ifndef PRODUCT | |
185 | |
186 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index) { | |
187 ResourceMark rm; | |
188 HandleMark hm; | |
189 klassOop klass = receiver->klass(); | |
190 instanceKlass* ik = instanceKlass::cast(klass); | |
191 klassVtable* vt = ik->vtable(); | |
192 klass->print(); | |
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193 fatal(err_msg("bad compiled vtable dispatch: receiver " INTPTR_FORMAT ", " |
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194 "index %d (vtable length %d)", |
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195 (address)receiver, index, vt->length())); |
0 | 196 } |
197 | |
198 #endif // Product |