Mercurial > hg > truffle
annotate src/share/vm/compiler/oopMap.cpp @ 16683:4d0d1dc5db00
introduce extra field to record when HotSpotGraalRuntime has been initialized to avoid spurious errors during VM shutdown for short lived applications
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 04 Aug 2014 23:25:14 +0200 |
parents | 82ff6c8c8f6e |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2013, 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" |
26 #include "code/codeBlob.hpp" | |
27 #include "code/codeCache.hpp" | |
28 #include "code/nmethod.hpp" | |
29 #include "code/scopeDesc.hpp" | |
30 #include "compiler/oopMap.hpp" | |
31 #include "gc_interface/collectedHeap.hpp" | |
32 #include "memory/allocation.inline.hpp" | |
33 #include "memory/resourceArea.hpp" | |
34 #include "runtime/frame.inline.hpp" | |
35 #include "runtime/signature.hpp" | |
36 #ifdef COMPILER1 | |
37 #include "c1/c1_Defs.hpp" | |
38 #endif | |
0 | 39 |
40 // OopMapStream | |
41 | |
42 OopMapStream::OopMapStream(OopMap* oop_map) { | |
43 if(oop_map->omv_data() == NULL) { | |
44 _stream = new CompressedReadStream(oop_map->write_stream()->buffer()); | |
45 } else { | |
46 _stream = new CompressedReadStream(oop_map->omv_data()); | |
47 } | |
48 _mask = OopMapValue::type_mask_in_place; | |
49 _size = oop_map->omv_count(); | |
50 _position = 0; | |
51 _valid_omv = false; | |
52 } | |
53 | |
54 | |
55 OopMapStream::OopMapStream(OopMap* oop_map, int oop_types_mask) { | |
56 if(oop_map->omv_data() == NULL) { | |
57 _stream = new CompressedReadStream(oop_map->write_stream()->buffer()); | |
58 } else { | |
59 _stream = new CompressedReadStream(oop_map->omv_data()); | |
60 } | |
61 _mask = oop_types_mask; | |
62 _size = oop_map->omv_count(); | |
63 _position = 0; | |
64 _valid_omv = false; | |
65 } | |
66 | |
67 | |
68 void OopMapStream::find_next() { | |
69 while(_position++ < _size) { | |
70 _omv.read_from(_stream); | |
71 if(((int)_omv.type() & _mask) > 0) { | |
72 _valid_omv = true; | |
73 return; | |
74 } | |
75 } | |
76 _valid_omv = false; | |
77 } | |
78 | |
79 | |
80 // OopMap | |
81 | |
82 // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd | |
83 // slots to hold 4-byte values like ints and floats in the LP64 build. | |
84 OopMap::OopMap(int frame_size, int arg_count) { | |
85 // OopMaps are usually quite so small, so pick a small initial size | |
86 set_write_stream(new CompressedWriteStream(32)); | |
87 set_omv_data(NULL); | |
88 set_omv_count(0); | |
89 | |
90 #ifdef ASSERT | |
91 _locs_length = VMRegImpl::stack2reg(0)->value() + frame_size + arg_count; | |
92 _locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length); | |
93 for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value; | |
94 #endif | |
95 } | |
96 | |
97 | |
98 OopMap::OopMap(OopMap::DeepCopyToken, OopMap* source) { | |
99 // This constructor does a deep copy | |
100 // of the source OopMap. | |
101 set_write_stream(new CompressedWriteStream(source->omv_count() * 2)); | |
102 set_omv_data(NULL); | |
103 set_omv_count(0); | |
104 set_offset(source->offset()); | |
105 | |
106 #ifdef ASSERT | |
107 _locs_length = source->_locs_length; | |
108 _locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length); | |
109 for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value; | |
110 #endif | |
111 | |
112 // We need to copy the entries too. | |
113 for (OopMapStream oms(source); !oms.is_done(); oms.next()) { | |
114 OopMapValue omv = oms.current(); | |
115 omv.write_on(write_stream()); | |
116 increment_count(); | |
117 } | |
118 } | |
119 | |
120 | |
121 OopMap* OopMap::deep_copy() { | |
122 return new OopMap(_deep_copy_token, this); | |
123 } | |
124 | |
125 | |
126 void OopMap::copy_to(address addr) { | |
127 memcpy(addr,this,sizeof(OopMap)); | |
128 memcpy(addr + sizeof(OopMap),write_stream()->buffer(),write_stream()->position()); | |
129 OopMap* new_oop = (OopMap*)addr; | |
130 new_oop->set_omv_data_size(write_stream()->position()); | |
131 new_oop->set_omv_data((unsigned char *)(addr + sizeof(OopMap))); | |
132 new_oop->set_write_stream(NULL); | |
133 } | |
134 | |
135 | |
136 int OopMap::heap_size() const { | |
137 int size = sizeof(OopMap); | |
138 int align = sizeof(void *) - 1; | |
139 if(write_stream() != NULL) { | |
140 size += write_stream()->position(); | |
141 } else { | |
142 size += omv_data_size(); | |
143 } | |
144 // Align to a reasonable ending point | |
145 size = ((size+align) & ~align); | |
146 return size; | |
147 } | |
148 | |
149 // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd | |
150 // slots to hold 4-byte values like ints and floats in the LP64 build. | |
151 void OopMap::set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional) { | |
152 | |
153 assert(reg->value() < _locs_length, "too big reg value for stack size"); | |
154 assert( _locs_used[reg->value()] == OopMapValue::unused_value, "cannot insert twice" ); | |
155 debug_only( _locs_used[reg->value()] = x; ) | |
156 | |
157 OopMapValue o(reg, x); | |
158 | |
159 if(x == OopMapValue::callee_saved_value) { | |
160 // This can never be a stack location, so we don't need to transform it. | |
161 assert(optional->is_reg(), "Trying to callee save a stack location"); | |
162 o.set_content_reg(optional); | |
163 } else if(x == OopMapValue::derived_oop_value) { | |
164 o.set_content_reg(optional); | |
165 } | |
166 | |
167 o.write_on(write_stream()); | |
168 increment_count(); | |
169 } | |
170 | |
171 | |
172 void OopMap::set_oop(VMReg reg) { | |
173 set_xxx(reg, OopMapValue::oop_value, VMRegImpl::Bad()); | |
174 } | |
175 | |
176 | |
177 void OopMap::set_value(VMReg reg) { | |
178 // At this time, we only need value entries in our OopMap when ZapDeadCompiledLocals is active. | |
179 } | |
180 | |
181 | |
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182 void OopMap::set_narrowoop(VMReg reg) { |
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183 set_xxx(reg, OopMapValue::narrowoop_value, VMRegImpl::Bad()); |
0 | 184 } |
185 | |
186 | |
187 void OopMap::set_callee_saved(VMReg reg, VMReg caller_machine_register ) { | |
188 set_xxx(reg, OopMapValue::callee_saved_value, caller_machine_register); | |
189 } | |
190 | |
191 | |
192 void OopMap::set_derived_oop(VMReg reg, VMReg derived_from_local_register ) { | |
193 if( reg == derived_from_local_register ) { | |
194 // Actually an oop, derived shares storage with base, | |
195 set_oop(reg); | |
196 } else { | |
197 set_xxx(reg, OopMapValue::derived_oop_value, derived_from_local_register); | |
198 } | |
199 } | |
200 | |
201 // OopMapSet | |
202 | |
203 OopMapSet::OopMapSet() { | |
204 set_om_size(MinOopMapAllocation); | |
205 set_om_count(0); | |
206 OopMap** temp = NEW_RESOURCE_ARRAY(OopMap*, om_size()); | |
207 set_om_data(temp); | |
208 } | |
209 | |
210 | |
211 void OopMapSet::grow_om_data() { | |
212 int new_size = om_size() * 2; | |
213 OopMap** new_data = NEW_RESOURCE_ARRAY(OopMap*, new_size); | |
214 memcpy(new_data,om_data(),om_size() * sizeof(OopMap*)); | |
215 set_om_size(new_size); | |
216 set_om_data(new_data); | |
217 } | |
218 | |
219 | |
220 void OopMapSet::copy_to(address addr) { | |
221 address temp = addr; | |
222 int align = sizeof(void *) - 1; | |
223 // Copy this | |
224 memcpy(addr,this,sizeof(OopMapSet)); | |
225 temp += sizeof(OopMapSet); | |
226 temp = (address)((intptr_t)(temp + align) & ~align); | |
227 // Do the needed fixups to the new OopMapSet | |
228 OopMapSet* new_set = (OopMapSet*)addr; | |
229 new_set->set_om_data((OopMap**)temp); | |
230 // Allow enough space for the OopMap pointers | |
231 temp += (om_count() * sizeof(OopMap*)); | |
232 | |
233 for(int i=0; i < om_count(); i++) { | |
234 OopMap* map = at(i); | |
235 map->copy_to((address)temp); | |
236 new_set->set(i,(OopMap*)temp); | |
237 temp += map->heap_size(); | |
238 } | |
239 // This "locks" the OopMapSet | |
240 new_set->set_om_size(-1); | |
241 } | |
242 | |
243 | |
244 void OopMapSet::add_gc_map(int pc_offset, OopMap *map ) { | |
245 assert(om_size() != -1,"Cannot grow a fixed OopMapSet"); | |
246 | |
247 if(om_count() >= om_size()) { | |
248 grow_om_data(); | |
249 } | |
250 map->set_offset(pc_offset); | |
251 | |
252 #ifdef ASSERT | |
253 if(om_count() > 0) { | |
254 OopMap* last = at(om_count()-1); | |
255 if (last->offset() == map->offset() ) { | |
256 fatal("OopMap inserted twice"); | |
257 } | |
258 if(last->offset() > map->offset()) { | |
259 tty->print_cr( "WARNING, maps not sorted: pc[%d]=%d, pc[%d]=%d", | |
260 om_count(),last->offset(),om_count()+1,map->offset()); | |
261 } | |
262 } | |
263 #endif // ASSERT | |
264 | |
265 set(om_count(),map); | |
266 increment_count(); | |
267 } | |
268 | |
269 | |
270 int OopMapSet::heap_size() const { | |
271 // The space we use | |
272 int size = sizeof(OopMap); | |
273 int align = sizeof(void *) - 1; | |
274 size = ((size+align) & ~align); | |
275 size += om_count() * sizeof(OopMap*); | |
276 | |
277 // Now add in the space needed for the indivdiual OopMaps | |
278 for(int i=0; i < om_count(); i++) { | |
279 size += at(i)->heap_size(); | |
280 } | |
281 // We don't need to align this, it will be naturally pointer aligned | |
282 return size; | |
283 } | |
284 | |
285 | |
286 OopMap* OopMapSet::singular_oop_map() { | |
287 guarantee(om_count() == 1, "Make sure we only have a single gc point"); | |
288 return at(0); | |
289 } | |
290 | |
291 | |
292 OopMap* OopMapSet::find_map_at_offset(int pc_offset) const { | |
293 int i, len = om_count(); | |
294 assert( len > 0, "must have pointer maps" ); | |
295 | |
296 // Scan through oopmaps. Stop when current offset is either equal or greater | |
297 // than the one we are looking for. | |
298 for( i = 0; i < len; i++) { | |
299 if( at(i)->offset() >= pc_offset ) | |
300 break; | |
301 } | |
302 | |
303 assert( i < len, "oopmap not found" ); | |
304 | |
305 OopMap* m = at(i); | |
306 assert( m->offset() == pc_offset, "oopmap not found" ); | |
307 return m; | |
308 } | |
309 | |
310 class DoNothingClosure: public OopClosure { | |
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311 public: |
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312 void do_oop(oop* p) {} |
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313 void do_oop(narrowOop* p) {} |
0 | 314 }; |
315 static DoNothingClosure do_nothing; | |
316 | |
317 static void add_derived_oop(oop* base, oop* derived) { | |
318 #ifndef TIERED | |
319 COMPILER1_PRESENT(ShouldNotReachHere();) | |
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320 COMPILERGRAAL_PRESENT(ShouldNotReachHere();) |
0 | 321 #endif // TIERED |
322 #ifdef COMPILER2 | |
323 DerivedPointerTable::add(derived, base); | |
324 #endif // COMPILER2 | |
325 } | |
326 | |
327 | |
328 #ifndef PRODUCT | |
329 static void trace_codeblob_maps(const frame *fr, const RegisterMap *reg_map) { | |
330 // Print oopmap and regmap | |
331 tty->print_cr("------ "); | |
332 CodeBlob* cb = fr->cb(); | |
333 OopMapSet* maps = cb->oop_maps(); | |
334 OopMap* map = cb->oop_map_for_return_address(fr->pc()); | |
335 map->print(); | |
336 if( cb->is_nmethod() ) { | |
337 nmethod* nm = (nmethod*)cb; | |
338 // native wrappers have no scope data, it is implied | |
339 if (nm->is_native_method()) { | |
340 tty->print("bci: 0 (native)"); | |
341 } else { | |
342 ScopeDesc* scope = nm->scope_desc_at(fr->pc()); | |
343 tty->print("bci: %d ",scope->bci()); | |
344 } | |
345 } | |
346 tty->cr(); | |
347 fr->print_on(tty); | |
348 tty->print(" "); | |
349 cb->print_value_on(tty); tty->cr(); | |
350 reg_map->print(); | |
351 tty->print_cr("------ "); | |
352 | |
353 } | |
354 #endif // PRODUCT | |
355 | |
356 void OopMapSet::oops_do(const frame *fr, const RegisterMap* reg_map, OopClosure* f) { | |
357 // add derived oops to a table | |
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358 all_do(fr, reg_map, f, add_derived_oop, &do_nothing); |
0 | 359 } |
360 | |
361 | |
362 void OopMapSet::all_do(const frame *fr, const RegisterMap *reg_map, | |
363 OopClosure* oop_fn, void derived_oop_fn(oop*, oop*), | |
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364 OopClosure* value_fn) { |
0 | 365 CodeBlob* cb = fr->cb(); |
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366 assert(cb != NULL, "no codeblob"); |
0 | 367 |
368 NOT_PRODUCT(if (TraceCodeBlobStacks) trace_codeblob_maps(fr, reg_map);) | |
369 | |
370 OopMapSet* maps = cb->oop_maps(); | |
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371 OopMap* map = cb->oop_map_for_return_address(fr->pc()); |
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372 assert(map != NULL, "no ptr map found"); |
0 | 373 |
374 // handle derived pointers first (otherwise base pointer may be | |
375 // changed before derived pointer offset has been collected) | |
376 OopMapValue omv; | |
377 { | |
378 OopMapStream oms(map,OopMapValue::derived_oop_value); | |
379 if (!oms.is_done()) { | |
380 #ifndef TIERED | |
381 COMPILER1_PRESENT(ShouldNotReachHere();) | |
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382 COMPILERGRAAL_PRESENT(ShouldNotReachHere();) |
0 | 383 #endif // !TIERED |
384 // Protect the operation on the derived pointers. This | |
385 // protects the addition of derived pointers to the shared | |
386 // derived pointer table in DerivedPointerTable::add(). | |
387 MutexLockerEx x(DerivedPointerTableGC_lock, Mutex::_no_safepoint_check_flag); | |
388 do { | |
389 omv = oms.current(); | |
390 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
391 if ( loc != NULL ) { | |
392 oop *base_loc = fr->oopmapreg_to_location(omv.content_reg(), reg_map); | |
393 oop *derived_loc = loc; | |
858 | 394 oop val = *base_loc; |
395 if (val == (oop)NULL || Universe::is_narrow_oop_base(val)) { | |
396 // Ignore NULL oops and decoded NULL narrow oops which | |
397 // equal to Universe::narrow_oop_base when a narrow oop | |
398 // implicit null check is used in compiled code. | |
399 // The narrow_oop_base could be NULL or be the address | |
400 // of the page below heap depending on compressed oops mode. | |
401 } else | |
402 derived_oop_fn(base_loc, derived_loc); | |
0 | 403 } |
404 oms.next(); | |
405 } while (!oms.is_done()); | |
406 } | |
407 } | |
408 | |
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409 // We want coop, value and oop oop_types |
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410 int mask = OopMapValue::oop_value | OopMapValue::narrowoop_value; |
0 | 411 { |
412 for (OopMapStream oms(map,mask); !oms.is_done(); oms.next()) { | |
413 omv = oms.current(); | |
414 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
415 if ( loc != NULL ) { | |
416 if ( omv.type() == OopMapValue::oop_value ) { | |
858 | 417 oop val = *loc; |
418 if (val == (oop)NULL || Universe::is_narrow_oop_base(val)) { | |
419 // Ignore NULL oops and decoded NULL narrow oops which | |
420 // equal to Universe::narrow_oop_base when a narrow oop | |
421 // implicit null check is used in compiled code. | |
422 // The narrow_oop_base could be NULL or be the address | |
423 // of the page below heap depending on compressed oops mode. | |
424 continue; | |
425 } | |
0 | 426 #ifdef ASSERT |
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427 if ((((uintptr_t)loc & (sizeof(*loc)-1)) != 0) || |
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428 !Universe::heap()->is_in_or_null(*loc)) { |
0 | 429 tty->print_cr("# Found non oop pointer. Dumping state at failure"); |
430 // try to dump out some helpful debugging information | |
431 trace_codeblob_maps(fr, reg_map); | |
432 omv.print(); | |
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433 tty->print_cr("register r"); |
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434 omv.reg()->print(); |
0 | 435 tty->print_cr("loc = %p *loc = %p\n", loc, (address)*loc); |
436 // do the real assert. | |
437 assert(Universe::heap()->is_in_or_null(*loc), "found non oop pointer"); | |
438 } | |
439 #endif // ASSERT | |
440 oop_fn->do_oop(loc); | |
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441 } else if ( omv.type() == OopMapValue::narrowoop_value ) { |
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442 narrowOop *nl = (narrowOop*)loc; |
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443 #ifndef VM_LITTLE_ENDIAN |
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444 if (!omv.reg()->is_stack()) { |
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445 // compressed oops in registers only take up 4 bytes of an |
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446 // 8 byte register but they are in the wrong part of the |
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447 // word so adjust loc to point at the right place. |
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448 nl = (narrowOop*)((address)nl + 4); |
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449 } |
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450 #endif |
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451 oop_fn->do_oop(nl); |
0 | 452 } |
453 } | |
454 } | |
455 } | |
456 } | |
457 | |
458 | |
459 // Update callee-saved register info for the following frame | |
460 void OopMapSet::update_register_map(const frame *fr, RegisterMap *reg_map) { | |
461 ResourceMark rm; | |
462 CodeBlob* cb = fr->cb(); | |
463 assert(cb != NULL, "no codeblob"); | |
464 | |
465 // Any reg might be saved by a safepoint handler (see generate_handler_blob). | |
466 const int max_saved_on_entry_reg_count = ConcreteRegisterImpl::number_of_registers; | |
467 assert( reg_map->_update_for_id == NULL || fr->is_older(reg_map->_update_for_id), | |
468 "already updated this map; do not 'update' it twice!" ); | |
469 debug_only(reg_map->_update_for_id = fr->id()); | |
470 | |
471 // Check if caller must update oop argument | |
472 assert((reg_map->include_argument_oops() || | |
473 !cb->caller_must_gc_arguments(reg_map->thread())), | |
474 "include_argument_oops should already be set"); | |
475 | |
476 int nof_callee = 0; | |
477 oop* locs[2*max_saved_on_entry_reg_count+1]; | |
478 VMReg regs[2*max_saved_on_entry_reg_count+1]; | |
479 // ("+1" because max_saved_on_entry_reg_count might be zero) | |
480 | |
481 // Scan through oopmap and find location of all callee-saved registers | |
482 // (we do not do update in place, since info could be overwritten) | |
483 | |
484 address pc = fr->pc(); | |
485 | |
486 OopMap* map = cb->oop_map_for_return_address(pc); | |
487 | |
488 assert(map != NULL, " no ptr map found"); | |
489 | |
490 OopMapValue omv; | |
491 for(OopMapStream oms(map,OopMapValue::callee_saved_value); !oms.is_done(); oms.next()) { | |
492 omv = oms.current(); | |
493 assert(nof_callee < 2*max_saved_on_entry_reg_count, "overflow"); | |
494 regs[nof_callee] = omv.content_reg(); | |
495 locs[nof_callee] = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
496 nof_callee++; | |
497 } | |
498 | |
499 // Check that runtime stubs save all callee-saved registers | |
500 #ifdef COMPILER2 | |
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501 assert(cb->is_compiled_by_c1() || cb->is_compiled_by_graal() || !cb->is_runtime_stub() || |
0 | 502 (nof_callee >= SAVED_ON_ENTRY_REG_COUNT || nof_callee >= C_SAVED_ON_ENTRY_REG_COUNT), |
503 "must save all"); | |
504 #endif // COMPILER2 | |
505 | |
506 // Copy found callee-saved register to reg_map | |
507 for(int i = 0; i < nof_callee; i++) { | |
508 reg_map->set_location(regs[i], (address)locs[i]); | |
509 } | |
510 } | |
511 | |
512 //============================================================================= | |
513 // Non-Product code | |
514 | |
515 #ifndef PRODUCT | |
516 | |
517 bool OopMap::has_derived_pointer() const { | |
518 #ifndef TIERED | |
519 COMPILER1_PRESENT(return false); | |
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520 COMPILERGRAAL_PRESENT(return false); |
0 | 521 #endif // !TIERED |
522 #ifdef COMPILER2 | |
523 OopMapStream oms((OopMap*)this,OopMapValue::derived_oop_value); | |
524 return oms.is_done(); | |
525 #else | |
526 return false; | |
527 #endif // COMPILER2 | |
528 } | |
529 | |
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530 #endif //PRODUCT |
0 | 531 |
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532 // Printing code is present in product build for -XX:+PrintAssembly. |
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533 |
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534 static |
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535 void print_register_type(OopMapValue::oop_types x, VMReg optional, |
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536 outputStream* st) { |
0 | 537 switch( x ) { |
538 case OopMapValue::oop_value: | |
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539 st->print("Oop"); |
0 | 540 break; |
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541 case OopMapValue::narrowoop_value: |
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542 st->print("NarrowOop"); |
0 | 543 break; |
544 case OopMapValue::callee_saved_value: | |
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545 st->print("Callers_"); |
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546 optional->print_on(st); |
0 | 547 break; |
548 case OopMapValue::derived_oop_value: | |
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549 st->print("Derived_oop_"); |
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550 optional->print_on(st); |
0 | 551 break; |
552 default: | |
553 ShouldNotReachHere(); | |
554 } | |
555 } | |
556 | |
557 | |
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558 void OopMapValue::print_on(outputStream* st) const { |
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559 reg()->print_on(st); |
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560 st->print("="); |
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561 print_register_type(type(),content_reg(),st); |
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562 st->print(" "); |
0 | 563 } |
564 | |
565 | |
566 void OopMap::print_on(outputStream* st) const { | |
567 OopMapValue omv; | |
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568 st->print("OopMap{"); |
0 | 569 for(OopMapStream oms((OopMap*)this); !oms.is_done(); oms.next()) { |
570 omv = oms.current(); | |
571 omv.print_on(st); | |
572 } | |
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573 st->print("off=%d}", (int) offset()); |
0 | 574 } |
575 | |
576 | |
577 void OopMapSet::print_on(outputStream* st) const { | |
578 int i, len = om_count(); | |
579 | |
580 st->print_cr("OopMapSet contains %d OopMaps\n",len); | |
581 | |
582 for( i = 0; i < len; i++) { | |
583 OopMap* m = at(i); | |
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584 st->print_cr("#%d ",i); |
0 | 585 m->print_on(st); |
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586 st->cr(); |
0 | 587 } |
588 } | |
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589 |
0 | 590 |
591 | |
592 //------------------------------DerivedPointerTable--------------------------- | |
593 | |
594 #ifdef COMPILER2 | |
595 | |
6197 | 596 class DerivedPointerEntry : public CHeapObj<mtCompiler> { |
0 | 597 private: |
598 oop* _location; // Location of derived pointer (also pointing to the base) | |
599 intptr_t _offset; // Offset from base pointer | |
600 public: | |
601 DerivedPointerEntry(oop* location, intptr_t offset) { _location = location; _offset = offset; } | |
602 oop* location() { return _location; } | |
603 intptr_t offset() { return _offset; } | |
604 }; | |
605 | |
606 | |
607 GrowableArray<DerivedPointerEntry*>* DerivedPointerTable::_list = NULL; | |
608 bool DerivedPointerTable::_active = false; | |
609 | |
610 | |
611 void DerivedPointerTable::clear() { | |
612 // The first time, we create the list. Otherwise it should be | |
613 // empty. If not, then we have probably forgotton to call | |
614 // update_pointers after last GC/Scavenge. | |
615 assert (!_active, "should not be active"); | |
616 assert(_list == NULL || _list->length() == 0, "table not empty"); | |
617 if (_list == NULL) { | |
6197 | 618 _list = new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<DerivedPointerEntry*>(10, true); // Allocated on C heap |
0 | 619 } |
620 _active = true; | |
621 } | |
622 | |
623 | |
624 // Returns value of location as an int | |
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625 intptr_t value_of_loc(oop *pointer) { return cast_from_oop<intptr_t>((*pointer)); } |
0 | 626 |
627 | |
628 void DerivedPointerTable::add(oop *derived_loc, oop *base_loc) { | |
629 assert(Universe::heap()->is_in_or_null(*base_loc), "not an oop"); | |
630 assert(derived_loc != base_loc, "Base and derived in same location"); | |
631 if (_active) { | |
632 assert(*derived_loc != (oop)base_loc, "location already added"); | |
633 assert(_list != NULL, "list must exist"); | |
634 intptr_t offset = value_of_loc(derived_loc) - value_of_loc(base_loc); | |
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635 // This assert is invalid because derived pointers can be |
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636 // arbitrarily far away from their base. |
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637 // assert(offset >= -1000000, "wrong derived pointer info"); |
0 | 638 |
639 if (TraceDerivedPointers) { | |
640 tty->print_cr( | |
641 "Add derived pointer@" INTPTR_FORMAT | |
642 " - Derived: " INTPTR_FORMAT | |
643 " Base: " INTPTR_FORMAT " (@" INTPTR_FORMAT ") (Offset: %d)", | |
644 derived_loc, (address)*derived_loc, (address)*base_loc, base_loc, offset | |
645 ); | |
646 } | |
647 // Set derived oop location to point to base. | |
648 *derived_loc = (oop)base_loc; | |
649 assert_lock_strong(DerivedPointerTableGC_lock); | |
650 DerivedPointerEntry *entry = new DerivedPointerEntry(derived_loc, offset); | |
651 _list->append(entry); | |
652 } | |
653 } | |
654 | |
655 | |
656 void DerivedPointerTable::update_pointers() { | |
657 assert(_list != NULL, "list must exist"); | |
658 for(int i = 0; i < _list->length(); i++) { | |
659 DerivedPointerEntry* entry = _list->at(i); | |
660 oop* derived_loc = entry->location(); | |
661 intptr_t offset = entry->offset(); | |
662 // The derived oop was setup to point to location of base | |
663 oop base = **(oop**)derived_loc; | |
664 assert(Universe::heap()->is_in_or_null(base), "must be an oop"); | |
665 | |
666 *derived_loc = (oop)(((address)base) + offset); | |
667 assert(value_of_loc(derived_loc) - value_of_loc(&base) == offset, "sanity check"); | |
668 | |
669 if (TraceDerivedPointers) { | |
670 tty->print_cr("Updating derived pointer@" INTPTR_FORMAT | |
671 " - Derived: " INTPTR_FORMAT " Base: " INTPTR_FORMAT " (Offset: %d)", | |
672 derived_loc, (address)*derived_loc, (address)base, offset); | |
673 } | |
674 | |
675 // Delete entry | |
676 delete entry; | |
677 _list->at_put(i, NULL); | |
678 } | |
679 // Clear list, so it is ready for next traversal (this is an invariant) | |
680 if (TraceDerivedPointers && !_list->is_empty()) { | |
681 tty->print_cr("--------------------------"); | |
682 } | |
683 _list->clear(); | |
684 _active = false; | |
685 } | |
686 | |
687 #endif // COMPILER2 |