Mercurial > hg > truffle
annotate src/share/vm/compiler/oopMap.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 7ad529321294 |
children | 82ff6c8c8f6e |
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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 if (ZapDeadCompiledLocals) | |
180 set_xxx(reg, OopMapValue::value_value, VMRegImpl::Bad()); | |
181 } | |
182 | |
183 | |
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184 void OopMap::set_narrowoop(VMReg reg) { |
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185 set_xxx(reg, OopMapValue::narrowoop_value, VMRegImpl::Bad()); |
0 | 186 } |
187 | |
188 | |
189 void OopMap::set_callee_saved(VMReg reg, VMReg caller_machine_register ) { | |
190 set_xxx(reg, OopMapValue::callee_saved_value, caller_machine_register); | |
191 } | |
192 | |
193 | |
194 void OopMap::set_derived_oop(VMReg reg, VMReg derived_from_local_register ) { | |
195 if( reg == derived_from_local_register ) { | |
196 // Actually an oop, derived shares storage with base, | |
197 set_oop(reg); | |
198 } else { | |
199 set_xxx(reg, OopMapValue::derived_oop_value, derived_from_local_register); | |
200 } | |
201 } | |
202 | |
203 // OopMapSet | |
204 | |
205 OopMapSet::OopMapSet() { | |
206 set_om_size(MinOopMapAllocation); | |
207 set_om_count(0); | |
208 OopMap** temp = NEW_RESOURCE_ARRAY(OopMap*, om_size()); | |
209 set_om_data(temp); | |
210 } | |
211 | |
212 | |
213 void OopMapSet::grow_om_data() { | |
214 int new_size = om_size() * 2; | |
215 OopMap** new_data = NEW_RESOURCE_ARRAY(OopMap*, new_size); | |
216 memcpy(new_data,om_data(),om_size() * sizeof(OopMap*)); | |
217 set_om_size(new_size); | |
218 set_om_data(new_data); | |
219 } | |
220 | |
221 | |
222 void OopMapSet::copy_to(address addr) { | |
223 address temp = addr; | |
224 int align = sizeof(void *) - 1; | |
225 // Copy this | |
226 memcpy(addr,this,sizeof(OopMapSet)); | |
227 temp += sizeof(OopMapSet); | |
228 temp = (address)((intptr_t)(temp + align) & ~align); | |
229 // Do the needed fixups to the new OopMapSet | |
230 OopMapSet* new_set = (OopMapSet*)addr; | |
231 new_set->set_om_data((OopMap**)temp); | |
232 // Allow enough space for the OopMap pointers | |
233 temp += (om_count() * sizeof(OopMap*)); | |
234 | |
235 for(int i=0; i < om_count(); i++) { | |
236 OopMap* map = at(i); | |
237 map->copy_to((address)temp); | |
238 new_set->set(i,(OopMap*)temp); | |
239 temp += map->heap_size(); | |
240 } | |
241 // This "locks" the OopMapSet | |
242 new_set->set_om_size(-1); | |
243 } | |
244 | |
245 | |
246 void OopMapSet::add_gc_map(int pc_offset, OopMap *map ) { | |
247 assert(om_size() != -1,"Cannot grow a fixed OopMapSet"); | |
248 | |
249 if(om_count() >= om_size()) { | |
250 grow_om_data(); | |
251 } | |
252 map->set_offset(pc_offset); | |
253 | |
254 #ifdef ASSERT | |
255 if(om_count() > 0) { | |
256 OopMap* last = at(om_count()-1); | |
257 if (last->offset() == map->offset() ) { | |
258 fatal("OopMap inserted twice"); | |
259 } | |
260 if(last->offset() > map->offset()) { | |
261 tty->print_cr( "WARNING, maps not sorted: pc[%d]=%d, pc[%d]=%d", | |
262 om_count(),last->offset(),om_count()+1,map->offset()); | |
263 } | |
264 } | |
265 #endif // ASSERT | |
266 | |
267 set(om_count(),map); | |
268 increment_count(); | |
269 } | |
270 | |
271 | |
272 int OopMapSet::heap_size() const { | |
273 // The space we use | |
274 int size = sizeof(OopMap); | |
275 int align = sizeof(void *) - 1; | |
276 size = ((size+align) & ~align); | |
277 size += om_count() * sizeof(OopMap*); | |
278 | |
279 // Now add in the space needed for the indivdiual OopMaps | |
280 for(int i=0; i < om_count(); i++) { | |
281 size += at(i)->heap_size(); | |
282 } | |
283 // We don't need to align this, it will be naturally pointer aligned | |
284 return size; | |
285 } | |
286 | |
287 | |
288 OopMap* OopMapSet::singular_oop_map() { | |
289 guarantee(om_count() == 1, "Make sure we only have a single gc point"); | |
290 return at(0); | |
291 } | |
292 | |
293 | |
294 OopMap* OopMapSet::find_map_at_offset(int pc_offset) const { | |
295 int i, len = om_count(); | |
296 assert( len > 0, "must have pointer maps" ); | |
297 | |
298 // Scan through oopmaps. Stop when current offset is either equal or greater | |
299 // than the one we are looking for. | |
300 for( i = 0; i < len; i++) { | |
301 if( at(i)->offset() >= pc_offset ) | |
302 break; | |
303 } | |
304 | |
305 assert( i < len, "oopmap not found" ); | |
306 | |
307 OopMap* m = at(i); | |
308 assert( m->offset() == pc_offset, "oopmap not found" ); | |
309 return m; | |
310 } | |
311 | |
312 class DoNothingClosure: public OopClosure { | |
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313 public: |
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314 void do_oop(oop* p) {} |
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315 void do_oop(narrowOop* p) {} |
0 | 316 }; |
317 static DoNothingClosure do_nothing; | |
318 | |
319 static void add_derived_oop(oop* base, oop* derived) { | |
320 #ifndef TIERED | |
321 COMPILER1_PRESENT(ShouldNotReachHere();) | |
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322 COMPILERGRAAL_PRESENT(ShouldNotReachHere();) |
0 | 323 #endif // TIERED |
324 #ifdef COMPILER2 | |
325 DerivedPointerTable::add(derived, base); | |
326 #endif // COMPILER2 | |
327 } | |
328 | |
329 | |
330 #ifndef PRODUCT | |
331 static void trace_codeblob_maps(const frame *fr, const RegisterMap *reg_map) { | |
332 // Print oopmap and regmap | |
333 tty->print_cr("------ "); | |
334 CodeBlob* cb = fr->cb(); | |
335 OopMapSet* maps = cb->oop_maps(); | |
336 OopMap* map = cb->oop_map_for_return_address(fr->pc()); | |
337 map->print(); | |
338 if( cb->is_nmethod() ) { | |
339 nmethod* nm = (nmethod*)cb; | |
340 // native wrappers have no scope data, it is implied | |
341 if (nm->is_native_method()) { | |
342 tty->print("bci: 0 (native)"); | |
343 } else { | |
344 ScopeDesc* scope = nm->scope_desc_at(fr->pc()); | |
345 tty->print("bci: %d ",scope->bci()); | |
346 } | |
347 } | |
348 tty->cr(); | |
349 fr->print_on(tty); | |
350 tty->print(" "); | |
351 cb->print_value_on(tty); tty->cr(); | |
352 reg_map->print(); | |
353 tty->print_cr("------ "); | |
354 | |
355 } | |
356 #endif // PRODUCT | |
357 | |
358 void OopMapSet::oops_do(const frame *fr, const RegisterMap* reg_map, OopClosure* f) { | |
359 // add derived oops to a table | |
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360 all_do(fr, reg_map, f, add_derived_oop, &do_nothing); |
0 | 361 } |
362 | |
363 | |
364 void OopMapSet::all_do(const frame *fr, const RegisterMap *reg_map, | |
365 OopClosure* oop_fn, void derived_oop_fn(oop*, oop*), | |
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366 OopClosure* value_fn) { |
0 | 367 CodeBlob* cb = fr->cb(); |
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368 assert(cb != NULL, "no codeblob"); |
0 | 369 |
370 NOT_PRODUCT(if (TraceCodeBlobStacks) trace_codeblob_maps(fr, reg_map);) | |
371 | |
372 OopMapSet* maps = cb->oop_maps(); | |
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373 OopMap* map = cb->oop_map_for_return_address(fr->pc()); |
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374 assert(map != NULL, "no ptr map found"); |
0 | 375 |
376 // handle derived pointers first (otherwise base pointer may be | |
377 // changed before derived pointer offset has been collected) | |
378 OopMapValue omv; | |
379 { | |
380 OopMapStream oms(map,OopMapValue::derived_oop_value); | |
381 if (!oms.is_done()) { | |
382 #ifndef TIERED | |
383 COMPILER1_PRESENT(ShouldNotReachHere();) | |
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384 COMPILERGRAAL_PRESENT(ShouldNotReachHere();) |
0 | 385 #endif // !TIERED |
386 // Protect the operation on the derived pointers. This | |
387 // protects the addition of derived pointers to the shared | |
388 // derived pointer table in DerivedPointerTable::add(). | |
389 MutexLockerEx x(DerivedPointerTableGC_lock, Mutex::_no_safepoint_check_flag); | |
390 do { | |
391 omv = oms.current(); | |
392 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
393 if ( loc != NULL ) { | |
394 oop *base_loc = fr->oopmapreg_to_location(omv.content_reg(), reg_map); | |
395 oop *derived_loc = loc; | |
858 | 396 oop val = *base_loc; |
397 if (val == (oop)NULL || Universe::is_narrow_oop_base(val)) { | |
398 // Ignore NULL oops and decoded NULL narrow oops which | |
399 // equal to Universe::narrow_oop_base when a narrow oop | |
400 // implicit null check is used in compiled code. | |
401 // The narrow_oop_base could be NULL or be the address | |
402 // of the page below heap depending on compressed oops mode. | |
403 } else | |
404 derived_oop_fn(base_loc, derived_loc); | |
0 | 405 } |
406 oms.next(); | |
407 } while (!oms.is_done()); | |
408 } | |
409 } | |
410 | |
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411 // We want coop, value and oop oop_types |
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412 int mask = OopMapValue::oop_value | OopMapValue::value_value | OopMapValue::narrowoop_value; |
0 | 413 { |
414 for (OopMapStream oms(map,mask); !oms.is_done(); oms.next()) { | |
415 omv = oms.current(); | |
416 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
417 if ( loc != NULL ) { | |
418 if ( omv.type() == OopMapValue::oop_value ) { | |
858 | 419 oop val = *loc; |
420 if (val == (oop)NULL || Universe::is_narrow_oop_base(val)) { | |
421 // Ignore NULL oops and decoded NULL narrow oops which | |
422 // equal to Universe::narrow_oop_base when a narrow oop | |
423 // implicit null check is used in compiled code. | |
424 // The narrow_oop_base could be NULL or be the address | |
425 // of the page below heap depending on compressed oops mode. | |
426 continue; | |
427 } | |
0 | 428 #ifdef ASSERT |
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429 if ((((uintptr_t)loc & (sizeof(*loc)-1)) != 0) || |
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430 !Universe::heap()->is_in_or_null(*loc)) { |
0 | 431 tty->print_cr("# Found non oop pointer. Dumping state at failure"); |
432 // try to dump out some helpful debugging information | |
433 trace_codeblob_maps(fr, reg_map); | |
434 omv.print(); | |
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435 tty->print_cr("register r"); |
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436 omv.reg()->print(); |
0 | 437 tty->print_cr("loc = %p *loc = %p\n", loc, (address)*loc); |
438 // do the real assert. | |
439 assert(Universe::heap()->is_in_or_null(*loc), "found non oop pointer"); | |
440 } | |
441 #endif // ASSERT | |
442 oop_fn->do_oop(loc); | |
443 } else if ( omv.type() == OopMapValue::value_value ) { | |
858 | 444 assert((*loc) == (oop)NULL || !Universe::is_narrow_oop_base(*loc), |
445 "found invalid value pointer"); | |
0 | 446 value_fn->do_oop(loc); |
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447 } else if ( omv.type() == OopMapValue::narrowoop_value ) { |
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448 narrowOop *nl = (narrowOop*)loc; |
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449 #ifndef VM_LITTLE_ENDIAN |
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450 if (!omv.reg()->is_stack()) { |
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451 // compressed oops in registers only take up 4 bytes of an |
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452 // 8 byte register but they are in the wrong part of the |
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453 // word so adjust loc to point at the right place. |
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454 nl = (narrowOop*)((address)nl + 4); |
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455 } |
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456 #endif |
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457 oop_fn->do_oop(nl); |
0 | 458 } |
459 } | |
460 } | |
461 } | |
462 } | |
463 | |
464 | |
465 // Update callee-saved register info for the following frame | |
466 void OopMapSet::update_register_map(const frame *fr, RegisterMap *reg_map) { | |
467 ResourceMark rm; | |
468 CodeBlob* cb = fr->cb(); | |
469 assert(cb != NULL, "no codeblob"); | |
470 | |
471 // Any reg might be saved by a safepoint handler (see generate_handler_blob). | |
472 const int max_saved_on_entry_reg_count = ConcreteRegisterImpl::number_of_registers; | |
473 assert( reg_map->_update_for_id == NULL || fr->is_older(reg_map->_update_for_id), | |
474 "already updated this map; do not 'update' it twice!" ); | |
475 debug_only(reg_map->_update_for_id = fr->id()); | |
476 | |
477 // Check if caller must update oop argument | |
478 assert((reg_map->include_argument_oops() || | |
479 !cb->caller_must_gc_arguments(reg_map->thread())), | |
480 "include_argument_oops should already be set"); | |
481 | |
482 int nof_callee = 0; | |
483 oop* locs[2*max_saved_on_entry_reg_count+1]; | |
484 VMReg regs[2*max_saved_on_entry_reg_count+1]; | |
485 // ("+1" because max_saved_on_entry_reg_count might be zero) | |
486 | |
487 // Scan through oopmap and find location of all callee-saved registers | |
488 // (we do not do update in place, since info could be overwritten) | |
489 | |
490 address pc = fr->pc(); | |
491 | |
492 OopMap* map = cb->oop_map_for_return_address(pc); | |
493 | |
494 assert(map != NULL, " no ptr map found"); | |
495 | |
496 OopMapValue omv; | |
497 for(OopMapStream oms(map,OopMapValue::callee_saved_value); !oms.is_done(); oms.next()) { | |
498 omv = oms.current(); | |
499 assert(nof_callee < 2*max_saved_on_entry_reg_count, "overflow"); | |
500 regs[nof_callee] = omv.content_reg(); | |
501 locs[nof_callee] = fr->oopmapreg_to_location(omv.reg(),reg_map); | |
502 nof_callee++; | |
503 } | |
504 | |
505 // Check that runtime stubs save all callee-saved registers | |
506 #ifdef COMPILER2 | |
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507 assert(cb->is_compiled_by_c1() || cb->is_compiled_by_graal() || !cb->is_runtime_stub() || |
0 | 508 (nof_callee >= SAVED_ON_ENTRY_REG_COUNT || nof_callee >= C_SAVED_ON_ENTRY_REG_COUNT), |
509 "must save all"); | |
510 #endif // COMPILER2 | |
511 | |
512 // Copy found callee-saved register to reg_map | |
513 for(int i = 0; i < nof_callee; i++) { | |
514 reg_map->set_location(regs[i], (address)locs[i]); | |
515 } | |
516 } | |
517 | |
518 //============================================================================= | |
519 // Non-Product code | |
520 | |
521 #ifndef PRODUCT | |
522 | |
523 bool OopMap::has_derived_pointer() const { | |
524 #ifndef TIERED | |
525 COMPILER1_PRESENT(return false); | |
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526 COMPILERGRAAL_PRESENT(return false); |
0 | 527 #endif // !TIERED |
528 #ifdef COMPILER2 | |
529 OopMapStream oms((OopMap*)this,OopMapValue::derived_oop_value); | |
530 return oms.is_done(); | |
531 #else | |
532 return false; | |
533 #endif // COMPILER2 | |
534 } | |
535 | |
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536 #endif //PRODUCT |
0 | 537 |
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538 // Printing code is present in product build for -XX:+PrintAssembly. |
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539 |
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540 static |
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541 void print_register_type(OopMapValue::oop_types x, VMReg optional, |
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542 outputStream* st) { |
0 | 543 switch( x ) { |
544 case OopMapValue::oop_value: | |
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545 st->print("Oop"); |
0 | 546 break; |
547 case OopMapValue::value_value: | |
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548 st->print("Value"); |
0 | 549 break; |
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550 case OopMapValue::narrowoop_value: |
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551 st->print("NarrowOop"); |
0 | 552 break; |
553 case OopMapValue::callee_saved_value: | |
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554 st->print("Callers_"); |
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555 optional->print_on(st); |
0 | 556 break; |
557 case OopMapValue::derived_oop_value: | |
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558 st->print("Derived_oop_"); |
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559 optional->print_on(st); |
0 | 560 break; |
561 default: | |
562 ShouldNotReachHere(); | |
563 } | |
564 } | |
565 | |
566 | |
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567 void OopMapValue::print_on(outputStream* st) const { |
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568 reg()->print_on(st); |
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569 st->print("="); |
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570 print_register_type(type(),content_reg(),st); |
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571 st->print(" "); |
0 | 572 } |
573 | |
574 | |
575 void OopMap::print_on(outputStream* st) const { | |
576 OopMapValue omv; | |
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577 st->print("OopMap{"); |
0 | 578 for(OopMapStream oms((OopMap*)this); !oms.is_done(); oms.next()) { |
579 omv = oms.current(); | |
580 omv.print_on(st); | |
581 } | |
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582 st->print("off=%d}", (int) offset()); |
0 | 583 } |
584 | |
585 | |
586 void OopMapSet::print_on(outputStream* st) const { | |
587 int i, len = om_count(); | |
588 | |
589 st->print_cr("OopMapSet contains %d OopMaps\n",len); | |
590 | |
591 for( i = 0; i < len; i++) { | |
592 OopMap* m = at(i); | |
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593 st->print_cr("#%d ",i); |
0 | 594 m->print_on(st); |
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595 st->cr(); |
0 | 596 } |
597 } | |
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598 |
0 | 599 |
600 | |
601 //------------------------------DerivedPointerTable--------------------------- | |
602 | |
603 #ifdef COMPILER2 | |
604 | |
6197 | 605 class DerivedPointerEntry : public CHeapObj<mtCompiler> { |
0 | 606 private: |
607 oop* _location; // Location of derived pointer (also pointing to the base) | |
608 intptr_t _offset; // Offset from base pointer | |
609 public: | |
610 DerivedPointerEntry(oop* location, intptr_t offset) { _location = location; _offset = offset; } | |
611 oop* location() { return _location; } | |
612 intptr_t offset() { return _offset; } | |
613 }; | |
614 | |
615 | |
616 GrowableArray<DerivedPointerEntry*>* DerivedPointerTable::_list = NULL; | |
617 bool DerivedPointerTable::_active = false; | |
618 | |
619 | |
620 void DerivedPointerTable::clear() { | |
621 // The first time, we create the list. Otherwise it should be | |
622 // empty. If not, then we have probably forgotton to call | |
623 // update_pointers after last GC/Scavenge. | |
624 assert (!_active, "should not be active"); | |
625 assert(_list == NULL || _list->length() == 0, "table not empty"); | |
626 if (_list == NULL) { | |
6197 | 627 _list = new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<DerivedPointerEntry*>(10, true); // Allocated on C heap |
0 | 628 } |
629 _active = true; | |
630 } | |
631 | |
632 | |
633 // Returns value of location as an int | |
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634 intptr_t value_of_loc(oop *pointer) { return cast_from_oop<intptr_t>((*pointer)); } |
0 | 635 |
636 | |
637 void DerivedPointerTable::add(oop *derived_loc, oop *base_loc) { | |
638 assert(Universe::heap()->is_in_or_null(*base_loc), "not an oop"); | |
639 assert(derived_loc != base_loc, "Base and derived in same location"); | |
640 if (_active) { | |
641 assert(*derived_loc != (oop)base_loc, "location already added"); | |
642 assert(_list != NULL, "list must exist"); | |
643 intptr_t offset = value_of_loc(derived_loc) - value_of_loc(base_loc); | |
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644 // This assert is invalid because derived pointers can be |
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645 // arbitrarily far away from their base. |
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646 // assert(offset >= -1000000, "wrong derived pointer info"); |
0 | 647 |
648 if (TraceDerivedPointers) { | |
649 tty->print_cr( | |
650 "Add derived pointer@" INTPTR_FORMAT | |
651 " - Derived: " INTPTR_FORMAT | |
652 " Base: " INTPTR_FORMAT " (@" INTPTR_FORMAT ") (Offset: %d)", | |
653 derived_loc, (address)*derived_loc, (address)*base_loc, base_loc, offset | |
654 ); | |
655 } | |
656 // Set derived oop location to point to base. | |
657 *derived_loc = (oop)base_loc; | |
658 assert_lock_strong(DerivedPointerTableGC_lock); | |
659 DerivedPointerEntry *entry = new DerivedPointerEntry(derived_loc, offset); | |
660 _list->append(entry); | |
661 } | |
662 } | |
663 | |
664 | |
665 void DerivedPointerTable::update_pointers() { | |
666 assert(_list != NULL, "list must exist"); | |
667 for(int i = 0; i < _list->length(); i++) { | |
668 DerivedPointerEntry* entry = _list->at(i); | |
669 oop* derived_loc = entry->location(); | |
670 intptr_t offset = entry->offset(); | |
671 // The derived oop was setup to point to location of base | |
672 oop base = **(oop**)derived_loc; | |
673 assert(Universe::heap()->is_in_or_null(base), "must be an oop"); | |
674 | |
675 *derived_loc = (oop)(((address)base) + offset); | |
676 assert(value_of_loc(derived_loc) - value_of_loc(&base) == offset, "sanity check"); | |
677 | |
678 if (TraceDerivedPointers) { | |
679 tty->print_cr("Updating derived pointer@" INTPTR_FORMAT | |
680 " - Derived: " INTPTR_FORMAT " Base: " INTPTR_FORMAT " (Offset: %d)", | |
681 derived_loc, (address)*derived_loc, (address)base, offset); | |
682 } | |
683 | |
684 // Delete entry | |
685 delete entry; | |
686 _list->at_put(i, NULL); | |
687 } | |
688 // Clear list, so it is ready for next traversal (this is an invariant) | |
689 if (TraceDerivedPointers && !_list->is_empty()) { | |
690 tty->print_cr("--------------------------"); | |
691 } | |
692 _list->clear(); | |
693 _active = false; | |
694 } | |
695 | |
696 #endif // COMPILER2 |