45 address VtableStub::_chunk = NULL;
46 address VtableStub::_chunk_end = NULL;
47 VMReg VtableStub::_receiver_location = VMRegImpl::Bad();
48
49
50 void* VtableStub::operator new(size_t size, int code_size) throw() {
51 assert(size == sizeof(VtableStub), "mismatched size");
52 // compute real VtableStub size (rounded to nearest word)
53 const int real_size = round_to(code_size + sizeof(VtableStub), wordSize);
54 // malloc them in chunks to minimize header overhead
55 const int chunk_factor = 32;
56 if (_chunk == NULL || _chunk + real_size > _chunk_end) {
57 const int bytes = chunk_factor * real_size + pd_code_alignment();
58 BufferBlob* blob = BufferBlob::create("vtable chunks", bytes);
59 if (blob == NULL) {
60 return NULL;
61 }
62 _chunk = blob->content_begin();
63 _chunk_end = _chunk + bytes;
64 Forte::register_stub("vtable stub", _chunk, _chunk_end);
65 // Notify JVMTI about this stub. The event will be recorded by the enclosing
66 // JvmtiDynamicCodeEventCollector and posted when this thread has released
67 // all locks.
68 if (JvmtiExport::should_post_dynamic_code_generated()) {
69 JvmtiExport::post_dynamic_code_generated_while_holding_locks("vtable stub", _chunk, _chunk_end);
70 }
71 align_chunk();
72 }
73 assert(_chunk + real_size <= _chunk_end, "bad allocation");
74 void* res = _chunk;
75 _chunk += real_size;
76 align_chunk();
77 return res;
78 }
79
80
81 void VtableStub::print_on(outputStream* st) const {
82 st->print("vtable stub (index = %d, receiver_location = %d, code = [" INTPTR_FORMAT ", " INTPTR_FORMAT "[)",
83 index(), receiver_location(), code_begin(), code_end());
84 }
85
86
87 // -----------------------------------------------------------------------------------------
88 // Implementation of VtableStubs
89 //
90 // For each hash value there's a linked list of vtable stubs (with that
113
114 VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
115 if (s == NULL) {
116 if (is_vtable_stub) {
117 s = create_vtable_stub(vtable_index);
118 } else {
119 s = create_itable_stub(vtable_index);
120 }
121
122 // Creation of vtable or itable can fail if there is not enough free space in the code cache.
123 if (s == NULL) {
124 return NULL;
125 }
126
127 enter(is_vtable_stub, vtable_index, s);
128 if (PrintAdapterHandlers) {
129 tty->print_cr("Decoding VtableStub %s[%d]@%d",
130 is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location());
131 Disassembler::decode(s->code_begin(), s->code_end());
132 }
133 }
134 return s->entry_point();
135 }
136
137
138 inline uint VtableStubs::hash(bool is_vtable_stub, int vtable_index){
139 // Assumption: receiver_location < 4 in most cases.
140 int hash = ((vtable_index << 2) ^ VtableStub::receiver_location()->value()) + vtable_index;
141 return (is_vtable_stub ? ~hash : hash) & mask;
142 }
143
144
145 VtableStub* VtableStubs::lookup(bool is_vtable_stub, int vtable_index) {
146 MutexLocker ml(VtableStubs_lock);
147 unsigned hash = VtableStubs::hash(is_vtable_stub, vtable_index);
148 VtableStub* s = _table[hash];
149 while( s && !s->matches(is_vtable_stub, vtable_index)) s = s->next();
150 return s;
151 }
152
153
178 return stub_containing(pc) != NULL;
179 }
180
181
182 VtableStub* VtableStubs::stub_containing(address pc) {
183 // Note: No locking needed since any change to the data structure
184 // happens with an atomic store into it (we don't care about
185 // consistency with the _number_of_vtable_stubs counter).
186 for (int i = 0; i < N; i++) {
187 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) {
188 if (s->contains(pc)) return s;
189 }
190 }
191 return NULL;
192 }
193
194 void vtableStubs_init() {
195 VtableStubs::initialize();
196 }
197
198
199 //-----------------------------------------------------------------------------------------------------
200 // Non-product code
201 #ifndef PRODUCT
202
203 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index) {
204 ResourceMark rm;
205 HandleMark hm;
206 Klass* klass = receiver->klass();
207 InstanceKlass* ik = InstanceKlass::cast(klass);
208 klassVtable* vt = ik->vtable();
209 ik->print();
210 fatal(err_msg("bad compiled vtable dispatch: receiver " INTPTR_FORMAT ", "
211 "index %d (vtable length %d)",
212 (address)receiver, index, vt->length()));
213 }
214
215 #endif // Product
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45 address VtableStub::_chunk = NULL;
46 address VtableStub::_chunk_end = NULL;
47 VMReg VtableStub::_receiver_location = VMRegImpl::Bad();
48
49
50 void* VtableStub::operator new(size_t size, int code_size) throw() {
51 assert(size == sizeof(VtableStub), "mismatched size");
52 // compute real VtableStub size (rounded to nearest word)
53 const int real_size = round_to(code_size + sizeof(VtableStub), wordSize);
54 // malloc them in chunks to minimize header overhead
55 const int chunk_factor = 32;
56 if (_chunk == NULL || _chunk + real_size > _chunk_end) {
57 const int bytes = chunk_factor * real_size + pd_code_alignment();
58 BufferBlob* blob = BufferBlob::create("vtable chunks", bytes);
59 if (blob == NULL) {
60 return NULL;
61 }
62 _chunk = blob->content_begin();
63 _chunk_end = _chunk + bytes;
64 Forte::register_stub("vtable stub", _chunk, _chunk_end);
65 align_chunk();
66 }
67 assert(_chunk + real_size <= _chunk_end, "bad allocation");
68 void* res = _chunk;
69 _chunk += real_size;
70 align_chunk();
71 return res;
72 }
73
74
75 void VtableStub::print_on(outputStream* st) const {
76 st->print("vtable stub (index = %d, receiver_location = %d, code = [" INTPTR_FORMAT ", " INTPTR_FORMAT "[)",
77 index(), receiver_location(), code_begin(), code_end());
78 }
79
80
81 // -----------------------------------------------------------------------------------------
82 // Implementation of VtableStubs
83 //
84 // For each hash value there's a linked list of vtable stubs (with that
107
108 VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
109 if (s == NULL) {
110 if (is_vtable_stub) {
111 s = create_vtable_stub(vtable_index);
112 } else {
113 s = create_itable_stub(vtable_index);
114 }
115
116 // Creation of vtable or itable can fail if there is not enough free space in the code cache.
117 if (s == NULL) {
118 return NULL;
119 }
120
121 enter(is_vtable_stub, vtable_index, s);
122 if (PrintAdapterHandlers) {
123 tty->print_cr("Decoding VtableStub %s[%d]@%d",
124 is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location());
125 Disassembler::decode(s->code_begin(), s->code_end());
126 }
127 // Notify JVMTI about this stub. The event will be recorded by the enclosing
128 // JvmtiDynamicCodeEventCollector and posted when this thread has released
129 // all locks.
130 if (JvmtiExport::should_post_dynamic_code_generated()) {
131 JvmtiExport::post_dynamic_code_generated_while_holding_locks(is_vtable_stub? "vtable stub": "itable stub",
132 s->code_begin(), s->code_end());
133 }
134 }
135 return s->entry_point();
136 }
137
138
139 inline uint VtableStubs::hash(bool is_vtable_stub, int vtable_index){
140 // Assumption: receiver_location < 4 in most cases.
141 int hash = ((vtable_index << 2) ^ VtableStub::receiver_location()->value()) + vtable_index;
142 return (is_vtable_stub ? ~hash : hash) & mask;
143 }
144
145
146 VtableStub* VtableStubs::lookup(bool is_vtable_stub, int vtable_index) {
147 MutexLocker ml(VtableStubs_lock);
148 unsigned hash = VtableStubs::hash(is_vtable_stub, vtable_index);
149 VtableStub* s = _table[hash];
150 while( s && !s->matches(is_vtable_stub, vtable_index)) s = s->next();
151 return s;
152 }
153
154
179 return stub_containing(pc) != NULL;
180 }
181
182
183 VtableStub* VtableStubs::stub_containing(address pc) {
184 // Note: No locking needed since any change to the data structure
185 // happens with an atomic store into it (we don't care about
186 // consistency with the _number_of_vtable_stubs counter).
187 for (int i = 0; i < N; i++) {
188 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) {
189 if (s->contains(pc)) return s;
190 }
191 }
192 return NULL;
193 }
194
195 void vtableStubs_init() {
196 VtableStubs::initialize();
197 }
198
199 void VtableStubs::vtable_stub_do(void f(VtableStub*)) {
200 for (int i = 0; i < N; i++) {
201 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) {
202 f(s);
203 }
204 }
205 }
206
207
208 //-----------------------------------------------------------------------------------------------------
209 // Non-product code
210 #ifndef PRODUCT
211
212 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index) {
213 ResourceMark rm;
214 HandleMark hm;
215 Klass* klass = receiver->klass();
216 InstanceKlass* ik = InstanceKlass::cast(klass);
217 klassVtable* vt = ik->vtable();
218 ik->print();
219 fatal(err_msg("bad compiled vtable dispatch: receiver " INTPTR_FORMAT ", "
220 "index %d (vtable length %d)",
221 (address)receiver, index, vt->length()));
222 }
223
224 #endif // Product
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