Mercurial > hg > graal-jvmci-8
annotate src/share/vm/code/relocInfo.cpp @ 1663:7139e81efd2d
6970566: runThese fails with SIGSEGV
Reviewed-by: kvn
author | never |
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date | Thu, 22 Jul 2010 15:29:22 -0700 |
parents | e9ff18c4ace7 |
children | 3e8fbc61cee8 |
rev | line source |
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0 | 1 /* |
1579 | 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 * | |
1552
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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/_relocInfo.cpp.incl" | |
27 | |
28 | |
29 const RelocationHolder RelocationHolder::none; // its type is relocInfo::none | |
30 | |
31 | |
32 // Implementation of relocInfo | |
33 | |
34 #ifdef ASSERT | |
35 relocInfo::relocInfo(relocType t, int off, int f) { | |
36 assert(t != data_prefix_tag, "cannot build a prefix this way"); | |
37 assert((t & type_mask) == t, "wrong type"); | |
38 assert((f & format_mask) == f, "wrong format"); | |
39 assert(off >= 0 && off < offset_limit(), "offset out off bounds"); | |
40 assert((off & (offset_unit-1)) == 0, "misaligned offset"); | |
41 (*this) = relocInfo(t, RAW_BITS, off, f); | |
42 } | |
43 #endif | |
44 | |
45 void relocInfo::initialize(CodeSection* dest, Relocation* reloc) { | |
46 relocInfo* data = this+1; // here's where the data might go | |
47 dest->set_locs_end(data); // sync end: the next call may read dest.locs_end | |
48 reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end | |
49 relocInfo* data_limit = dest->locs_end(); | |
50 if (data_limit > data) { | |
51 relocInfo suffix = (*this); | |
52 data_limit = this->finish_prefix((short*) data_limit); | |
53 // Finish up with the suffix. (Hack note: pack_data_to might edit this.) | |
54 *data_limit = suffix; | |
55 dest->set_locs_end(data_limit+1); | |
56 } | |
57 } | |
58 | |
59 relocInfo* relocInfo::finish_prefix(short* prefix_limit) { | |
60 assert(sizeof(relocInfo) == sizeof(short), "change this code"); | |
61 short* p = (short*)(this+1); | |
62 assert(prefix_limit >= p, "must be a valid span of data"); | |
63 int plen = prefix_limit - p; | |
64 if (plen == 0) { | |
65 debug_only(_value = 0xFFFF); | |
66 return this; // no data: remove self completely | |
67 } | |
68 if (plen == 1 && fits_into_immediate(p[0])) { | |
69 (*this) = immediate_relocInfo(p[0]); // move data inside self | |
70 return this+1; | |
71 } | |
72 // cannot compact, so just update the count and return the limit pointer | |
73 (*this) = prefix_relocInfo(plen); // write new datalen | |
74 assert(data() + datalen() == prefix_limit, "pointers must line up"); | |
75 return (relocInfo*)prefix_limit; | |
76 } | |
77 | |
78 | |
79 void relocInfo::set_type(relocType t) { | |
80 int old_offset = addr_offset(); | |
81 int old_format = format(); | |
82 (*this) = relocInfo(t, old_offset, old_format); | |
83 assert(type()==(int)t, "sanity check"); | |
84 assert(addr_offset()==old_offset, "sanity check"); | |
85 assert(format()==old_format, "sanity check"); | |
86 } | |
87 | |
88 | |
89 void relocInfo::set_format(int f) { | |
90 int old_offset = addr_offset(); | |
91 assert((f & format_mask) == f, "wrong format"); | |
92 _value = (_value & ~(format_mask << offset_width)) | (f << offset_width); | |
93 assert(addr_offset()==old_offset, "sanity check"); | |
94 } | |
95 | |
96 | |
97 void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) { | |
98 bool found = false; | |
99 while (itr->next() && !found) { | |
100 if (itr->addr() == pc) { | |
101 assert(itr->type()==old_type, "wrong relocInfo type found"); | |
102 itr->current()->set_type(new_type); | |
103 found=true; | |
104 } | |
105 } | |
106 assert(found, "no relocInfo found for pc"); | |
107 } | |
108 | |
109 | |
110 void relocInfo::remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type) { | |
111 change_reloc_info_for_address(itr, pc, old_type, none); | |
112 } | |
113 | |
114 | |
115 // ---------------------------------------------------------------------------------------------------- | |
116 // Implementation of RelocIterator | |
117 | |
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118 void RelocIterator::initialize(nmethod* nm, address begin, address limit) { |
0 | 119 initialize_misc(); |
120 | |
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121 if (nm == NULL && begin != NULL) { |
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122 // allow nmethod to be deduced from beginning address |
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123 CodeBlob* cb = CodeCache::find_blob(begin); |
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124 nm = cb->as_nmethod_or_null(); |
0 | 125 } |
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126 assert(nm != NULL, "must be able to deduce nmethod from other arguments"); |
0 | 127 |
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128 _code = nm; |
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129 _current = nm->relocation_begin() - 1; |
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130 _end = nm->relocation_end(); |
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131 _addr = (address) nm->instructions_begin(); |
0 | 132 |
133 assert(!has_current(), "just checking"); | |
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134 address code_end = nm->instructions_end(); |
0 | 135 |
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136 assert(begin == NULL || begin >= nm->instructions_begin(), "in bounds"); |
0 | 137 // FIX THIS assert(limit == NULL || limit <= code_end, "in bounds"); |
138 set_limits(begin, limit); | |
139 } | |
140 | |
141 | |
142 RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) { | |
143 initialize_misc(); | |
144 | |
145 _current = cs->locs_start()-1; | |
146 _end = cs->locs_end(); | |
147 _addr = cs->start(); | |
148 _code = NULL; // Not cb->blob(); | |
149 | |
150 CodeBuffer* cb = cs->outer(); | |
151 assert((int)SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal"); | |
152 for (int n = 0; n < (int)SECT_LIMIT; n++) { | |
153 _section_start[n] = cb->code_section(n)->start(); | |
154 } | |
155 | |
156 assert(!has_current(), "just checking"); | |
157 | |
158 assert(begin == NULL || begin >= cs->start(), "in bounds"); | |
159 assert(limit == NULL || limit <= cs->end(), "in bounds"); | |
160 set_limits(begin, limit); | |
161 } | |
162 | |
163 | |
164 enum { indexCardSize = 128 }; | |
165 struct RelocIndexEntry { | |
166 jint addr_offset; // offset from header_end of an addr() | |
167 jint reloc_offset; // offset from header_end of a relocInfo (prefix) | |
168 }; | |
169 | |
170 | |
171 static inline int num_cards(int code_size) { | |
172 return (code_size-1) / indexCardSize; | |
173 } | |
174 | |
175 | |
176 int RelocIterator::locs_and_index_size(int code_size, int locs_size) { | |
177 if (!UseRelocIndex) return locs_size; // no index | |
178 code_size = round_to(code_size, oopSize); | |
179 locs_size = round_to(locs_size, oopSize); | |
180 int index_size = num_cards(code_size) * sizeof(RelocIndexEntry); | |
181 // format of indexed relocs: | |
182 // relocation_begin: relocInfo ... | |
183 // index: (addr,reloc#) ... | |
184 // indexSize :relocation_end | |
185 return locs_size + index_size + BytesPerInt; | |
186 } | |
187 | |
188 | |
189 void RelocIterator::create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end) { | |
190 address relocation_begin = (address)dest_begin; | |
191 address relocation_end = (address)dest_end; | |
192 int total_size = relocation_end - relocation_begin; | |
193 int locs_size = dest_count * sizeof(relocInfo); | |
194 if (!UseRelocIndex) { | |
195 Copy::fill_to_bytes(relocation_begin + locs_size, total_size-locs_size, 0); | |
196 return; | |
197 } | |
198 int index_size = total_size - locs_size - BytesPerInt; // find out how much space is left | |
199 int ncards = index_size / sizeof(RelocIndexEntry); | |
200 assert(total_size == locs_size + index_size + BytesPerInt, "checkin'"); | |
201 assert(index_size >= 0 && index_size % sizeof(RelocIndexEntry) == 0, "checkin'"); | |
202 jint* index_size_addr = (jint*)relocation_end - 1; | |
203 | |
204 assert(sizeof(jint) == BytesPerInt, "change this code"); | |
205 | |
206 *index_size_addr = index_size; | |
207 if (index_size != 0) { | |
208 assert(index_size > 0, "checkin'"); | |
209 | |
210 RelocIndexEntry* index = (RelocIndexEntry *)(relocation_begin + locs_size); | |
211 assert(index == (RelocIndexEntry*)index_size_addr - ncards, "checkin'"); | |
212 | |
213 // walk over the relocations, and fill in index entries as we go | |
214 RelocIterator iter; | |
215 const address initial_addr = NULL; | |
216 relocInfo* const initial_current = dest_begin - 1; // biased by -1 like elsewhere | |
217 | |
218 iter._code = NULL; | |
219 iter._addr = initial_addr; | |
220 iter._limit = (address)(intptr_t)(ncards * indexCardSize); | |
221 iter._current = initial_current; | |
222 iter._end = dest_begin + dest_count; | |
223 | |
224 int i = 0; | |
225 address next_card_addr = (address)indexCardSize; | |
226 int addr_offset = 0; | |
227 int reloc_offset = 0; | |
228 while (true) { | |
229 // Checkpoint the iterator before advancing it. | |
230 addr_offset = iter._addr - initial_addr; | |
231 reloc_offset = iter._current - initial_current; | |
232 if (!iter.next()) break; | |
233 while (iter.addr() >= next_card_addr) { | |
234 index[i].addr_offset = addr_offset; | |
235 index[i].reloc_offset = reloc_offset; | |
236 i++; | |
237 next_card_addr += indexCardSize; | |
238 } | |
239 } | |
240 while (i < ncards) { | |
241 index[i].addr_offset = addr_offset; | |
242 index[i].reloc_offset = reloc_offset; | |
243 i++; | |
244 } | |
245 } | |
246 } | |
247 | |
248 | |
249 void RelocIterator::set_limits(address begin, address limit) { | |
250 int index_size = 0; | |
251 if (UseRelocIndex && _code != NULL) { | |
252 index_size = ((jint*)_end)[-1]; | |
253 _end = (relocInfo*)( (address)_end - index_size - BytesPerInt ); | |
254 } | |
255 | |
256 _limit = limit; | |
257 | |
258 // the limit affects this next stuff: | |
259 if (begin != NULL) { | |
260 #ifdef ASSERT | |
261 // In ASSERT mode we do not actually use the index, but simply | |
262 // check that its contents would have led us to the right answer. | |
263 address addrCheck = _addr; | |
264 relocInfo* infoCheck = _current; | |
265 #endif // ASSERT | |
266 if (index_size > 0) { | |
267 // skip ahead | |
268 RelocIndexEntry* index = (RelocIndexEntry*)_end; | |
269 RelocIndexEntry* index_limit = (RelocIndexEntry*)((address)index + index_size); | |
270 assert(_addr == _code->instructions_begin(), "_addr must be unadjusted"); | |
271 int card = (begin - _addr) / indexCardSize; | |
272 if (card > 0) { | |
273 if (index+card-1 < index_limit) index += card-1; | |
274 else index = index_limit - 1; | |
275 #ifdef ASSERT | |
276 addrCheck = _addr + index->addr_offset; | |
277 infoCheck = _current + index->reloc_offset; | |
278 #else | |
279 // Advance the iterator immediately to the last valid state | |
280 // for the previous card. Calling "next" will then advance | |
281 // it to the first item on the required card. | |
282 _addr += index->addr_offset; | |
283 _current += index->reloc_offset; | |
284 #endif // ASSERT | |
285 } | |
286 } | |
287 | |
288 relocInfo* backup; | |
289 address backup_addr; | |
290 while (true) { | |
291 backup = _current; | |
292 backup_addr = _addr; | |
293 #ifdef ASSERT | |
294 if (backup == infoCheck) { | |
295 assert(backup_addr == addrCheck, "must match"); addrCheck = NULL; infoCheck = NULL; | |
296 } else { | |
297 assert(addrCheck == NULL || backup_addr <= addrCheck, "must not pass addrCheck"); | |
298 } | |
299 #endif // ASSERT | |
300 if (!next() || addr() >= begin) break; | |
301 } | |
302 assert(addrCheck == NULL || addrCheck == backup_addr, "must have matched addrCheck"); | |
303 assert(infoCheck == NULL || infoCheck == backup, "must have matched infoCheck"); | |
304 // At this point, either we are at the first matching record, | |
305 // or else there is no such record, and !has_current(). | |
306 // In either case, revert to the immediatly preceding state. | |
307 _current = backup; | |
308 _addr = backup_addr; | |
309 set_has_current(false); | |
310 } | |
311 } | |
312 | |
313 | |
314 void RelocIterator::set_limit(address limit) { | |
315 address code_end = (address)code() + code()->size(); | |
316 assert(limit == NULL || limit <= code_end, "in bounds"); | |
317 _limit = limit; | |
318 } | |
319 | |
320 | |
321 void PatchingRelocIterator:: prepass() { | |
322 // turn breakpoints off during patching | |
323 _init_state = (*this); // save cursor | |
324 while (next()) { | |
325 if (type() == relocInfo::breakpoint_type) { | |
326 breakpoint_reloc()->set_active(false); | |
327 } | |
328 } | |
329 (RelocIterator&)(*this) = _init_state; // reset cursor for client | |
330 } | |
331 | |
332 | |
333 void PatchingRelocIterator:: postpass() { | |
334 // turn breakpoints back on after patching | |
335 (RelocIterator&)(*this) = _init_state; // reset cursor again | |
336 while (next()) { | |
337 if (type() == relocInfo::breakpoint_type) { | |
338 breakpoint_Relocation* bpt = breakpoint_reloc(); | |
339 bpt->set_active(bpt->enabled()); | |
340 } | |
341 } | |
342 } | |
343 | |
344 | |
345 // All the strange bit-encodings are in here. | |
346 // The idea is to encode relocation data which are small integers | |
347 // very efficiently (a single extra halfword). Larger chunks of | |
348 // relocation data need a halfword header to hold their size. | |
349 void RelocIterator::advance_over_prefix() { | |
350 if (_current->is_datalen()) { | |
351 _data = (short*) _current->data(); | |
352 _datalen = _current->datalen(); | |
353 _current += _datalen + 1; // skip the embedded data & header | |
354 } else { | |
355 _databuf = _current->immediate(); | |
356 _data = &_databuf; | |
357 _datalen = 1; | |
358 _current++; // skip the header | |
359 } | |
360 // The client will see the following relocInfo, whatever that is. | |
361 // It is the reloc to which the preceding data applies. | |
362 } | |
363 | |
364 | |
365 address RelocIterator::compute_section_start(int n) const { | |
366 // This routine not only computes a section start, but also | |
367 // memoizes it for later. | |
368 #define CACHE ((RelocIterator*)this)->_section_start[n] | |
369 CodeBlob* cb = code(); | |
370 guarantee(cb != NULL, "must have a code blob"); | |
371 if (n == CodeBuffer::SECT_INSTS) | |
372 return CACHE = cb->instructions_begin(); | |
373 assert(cb->is_nmethod(), "only nmethods have these sections"); | |
374 nmethod* nm = (nmethod*) cb; | |
375 address res = NULL; | |
376 switch (n) { | |
377 case CodeBuffer::SECT_STUBS: | |
378 res = nm->stub_begin(); | |
379 break; | |
380 case CodeBuffer::SECT_CONSTS: | |
381 res = nm->consts_begin(); | |
382 break; | |
383 default: | |
384 ShouldNotReachHere(); | |
385 } | |
386 assert(nm->contains(res) || res == nm->instructions_end(), "tame pointer"); | |
387 CACHE = res; | |
388 return res; | |
389 #undef CACHE | |
390 } | |
391 | |
392 | |
393 Relocation* RelocIterator::reloc() { | |
394 // (take the "switch" out-of-line) | |
395 relocInfo::relocType t = type(); | |
396 if (false) {} | |
397 #define EACH_TYPE(name) \ | |
398 else if (t == relocInfo::name##_type) { \ | |
399 return name##_reloc(); \ | |
400 } | |
401 APPLY_TO_RELOCATIONS(EACH_TYPE); | |
402 #undef EACH_TYPE | |
403 assert(t == relocInfo::none, "must be padding"); | |
404 return new(_rh) Relocation(); | |
405 } | |
406 | |
407 | |
408 //////// Methods for flyweight Relocation types | |
409 | |
410 | |
411 RelocationHolder RelocationHolder::plus(int offset) const { | |
412 if (offset != 0) { | |
413 switch (type()) { | |
414 case relocInfo::none: | |
415 break; | |
416 case relocInfo::oop_type: | |
417 { | |
418 oop_Relocation* r = (oop_Relocation*)reloc(); | |
419 return oop_Relocation::spec(r->oop_index(), r->offset() + offset); | |
420 } | |
421 default: | |
422 ShouldNotReachHere(); | |
423 } | |
424 } | |
425 return (*this); | |
426 } | |
427 | |
428 | |
429 void Relocation::guarantee_size() { | |
430 guarantee(false, "Make _relocbuf bigger!"); | |
431 } | |
432 | |
433 // some relocations can compute their own values | |
434 address Relocation::value() { | |
435 ShouldNotReachHere(); | |
436 return NULL; | |
437 } | |
438 | |
439 | |
440 void Relocation::set_value(address x) { | |
441 ShouldNotReachHere(); | |
442 } | |
443 | |
444 | |
445 RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) { | |
446 if (rtype == relocInfo::none) return RelocationHolder::none; | |
447 relocInfo ri = relocInfo(rtype, 0); | |
448 RelocIterator itr; | |
449 itr.set_current(ri); | |
450 itr.reloc(); | |
451 return itr._rh; | |
452 } | |
453 | |
454 | |
455 static inline bool is_index(intptr_t index) { | |
456 return 0 < index && index < os::vm_page_size(); | |
457 } | |
458 | |
459 | |
460 int32_t Relocation::runtime_address_to_index(address runtime_address) { | |
461 assert(!is_index((intptr_t)runtime_address), "must not look like an index"); | |
462 | |
463 if (runtime_address == NULL) return 0; | |
464 | |
465 StubCodeDesc* p = StubCodeDesc::desc_for(runtime_address); | |
466 if (p != NULL && p->begin() == runtime_address) { | |
467 assert(is_index(p->index()), "there must not be too many stubs"); | |
468 return (int32_t)p->index(); | |
469 } else { | |
470 // Known "miscellaneous" non-stub pointers: | |
471 // os::get_polling_page(), SafepointSynchronize::address_of_state() | |
472 if (PrintRelocations) { | |
473 tty->print_cr("random unregistered address in relocInfo: " INTPTR_FORMAT, runtime_address); | |
474 } | |
475 #ifndef _LP64 | |
476 return (int32_t) (intptr_t)runtime_address; | |
477 #else | |
478 // didn't fit return non-index | |
479 return -1; | |
480 #endif /* _LP64 */ | |
481 } | |
482 } | |
483 | |
484 | |
485 address Relocation::index_to_runtime_address(int32_t index) { | |
486 if (index == 0) return NULL; | |
487 | |
488 if (is_index(index)) { | |
489 StubCodeDesc* p = StubCodeDesc::desc_for_index(index); | |
490 assert(p != NULL, "there must be a stub for this index"); | |
491 return p->begin(); | |
492 } else { | |
493 #ifndef _LP64 | |
494 // this only works on 32bit machines | |
495 return (address) ((intptr_t) index); | |
496 #else | |
497 fatal("Relocation::index_to_runtime_address, int32_t not pointer sized"); | |
498 return NULL; | |
499 #endif /* _LP64 */ | |
500 } | |
501 } | |
502 | |
503 address Relocation::old_addr_for(address newa, | |
504 const CodeBuffer* src, CodeBuffer* dest) { | |
505 int sect = dest->section_index_of(newa); | |
506 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
507 address ostart = src->code_section(sect)->start(); | |
508 address nstart = dest->code_section(sect)->start(); | |
509 return ostart + (newa - nstart); | |
510 } | |
511 | |
512 address Relocation::new_addr_for(address olda, | |
513 const CodeBuffer* src, CodeBuffer* dest) { | |
514 debug_only(const CodeBuffer* src0 = src); | |
515 int sect = CodeBuffer::SECT_NONE; | |
516 // Look for olda in the source buffer, and all previous incarnations | |
517 // if the source buffer has been expanded. | |
518 for (; src != NULL; src = src->before_expand()) { | |
519 sect = src->section_index_of(olda); | |
520 if (sect != CodeBuffer::SECT_NONE) break; | |
521 } | |
522 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
523 address ostart = src->code_section(sect)->start(); | |
524 address nstart = dest->code_section(sect)->start(); | |
525 return nstart + (olda - ostart); | |
526 } | |
527 | |
528 void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) { | |
529 address addr0 = addr; | |
530 if (addr0 == NULL || dest->allocates2(addr0)) return; | |
531 CodeBuffer* cb = dest->outer(); | |
532 addr = new_addr_for(addr0, cb, cb); | |
533 assert(allow_other_sections || dest->contains2(addr), | |
534 "addr must be in required section"); | |
535 } | |
536 | |
537 | |
538 void CallRelocation::set_destination(address x) { | |
539 pd_set_call_destination(x); | |
540 } | |
541 | |
542 void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
543 // Usually a self-relative reference to an external routine. | |
544 // On some platforms, the reference is absolute (not self-relative). | |
545 // The enhanced use of pd_call_destination sorts this all out. | |
546 address orig_addr = old_addr_for(addr(), src, dest); | |
547 address callee = pd_call_destination(orig_addr); | |
548 // Reassert the callee address, this time in the new copy of the code. | |
549 pd_set_call_destination(callee); | |
550 } | |
551 | |
552 | |
553 //// pack/unpack methods | |
554 | |
555 void oop_Relocation::pack_data_to(CodeSection* dest) { | |
556 short* p = (short*) dest->locs_end(); | |
557 p = pack_2_ints_to(p, _oop_index, _offset); | |
558 dest->set_locs_end((relocInfo*) p); | |
559 } | |
560 | |
561 | |
562 void oop_Relocation::unpack_data() { | |
563 unpack_2_ints(_oop_index, _offset); | |
564 } | |
565 | |
566 | |
567 void virtual_call_Relocation::pack_data_to(CodeSection* dest) { | |
568 short* p = (short*) dest->locs_end(); | |
569 address point = dest->locs_point(); | |
570 | |
571 // Try to make a pointer NULL first. | |
572 if (_oop_limit >= point && | |
573 _oop_limit <= point + NativeCall::instruction_size) { | |
574 _oop_limit = NULL; | |
575 } | |
576 // If the _oop_limit is NULL, it "defaults" to the end of the call. | |
577 // See ic_call_Relocation::oop_limit() below. | |
578 | |
579 normalize_address(_first_oop, dest); | |
580 normalize_address(_oop_limit, dest); | |
581 jint x0 = scaled_offset_null_special(_first_oop, point); | |
582 jint x1 = scaled_offset_null_special(_oop_limit, point); | |
583 p = pack_2_ints_to(p, x0, x1); | |
584 dest->set_locs_end((relocInfo*) p); | |
585 } | |
586 | |
587 | |
588 void virtual_call_Relocation::unpack_data() { | |
589 jint x0, x1; unpack_2_ints(x0, x1); | |
590 address point = addr(); | |
591 _first_oop = x0==0? NULL: address_from_scaled_offset(x0, point); | |
592 _oop_limit = x1==0? NULL: address_from_scaled_offset(x1, point); | |
593 } | |
594 | |
595 | |
596 void static_stub_Relocation::pack_data_to(CodeSection* dest) { | |
597 short* p = (short*) dest->locs_end(); | |
598 CodeSection* insts = dest->outer()->insts(); | |
599 normalize_address(_static_call, insts); | |
600 p = pack_1_int_to(p, scaled_offset(_static_call, insts->start())); | |
601 dest->set_locs_end((relocInfo*) p); | |
602 } | |
603 | |
604 void static_stub_Relocation::unpack_data() { | |
605 address base = binding()->section_start(CodeBuffer::SECT_INSTS); | |
606 _static_call = address_from_scaled_offset(unpack_1_int(), base); | |
607 } | |
608 | |
609 | |
610 void external_word_Relocation::pack_data_to(CodeSection* dest) { | |
611 short* p = (short*) dest->locs_end(); | |
612 int32_t index = runtime_address_to_index(_target); | |
613 #ifndef _LP64 | |
614 p = pack_1_int_to(p, index); | |
615 #else | |
616 if (is_index(index)) { | |
617 p = pack_2_ints_to(p, index, 0); | |
618 } else { | |
619 jlong t = (jlong) _target; | |
620 int32_t lo = low(t); | |
621 int32_t hi = high(t); | |
622 p = pack_2_ints_to(p, lo, hi); | |
623 DEBUG_ONLY(jlong t1 = jlong_from(hi, lo)); | |
624 assert(!is_index(t1) && (address) t1 == _target, "not symmetric"); | |
625 } | |
626 #endif /* _LP64 */ | |
627 dest->set_locs_end((relocInfo*) p); | |
628 } | |
629 | |
630 | |
631 void external_word_Relocation::unpack_data() { | |
632 #ifndef _LP64 | |
633 _target = index_to_runtime_address(unpack_1_int()); | |
634 #else | |
635 int32_t lo, hi; | |
636 unpack_2_ints(lo, hi); | |
637 jlong t = jlong_from(hi, lo);; | |
638 if (is_index(t)) { | |
639 _target = index_to_runtime_address(t); | |
640 } else { | |
641 _target = (address) t; | |
642 } | |
643 #endif /* _LP64 */ | |
644 } | |
645 | |
646 | |
647 void internal_word_Relocation::pack_data_to(CodeSection* dest) { | |
648 short* p = (short*) dest->locs_end(); | |
649 normalize_address(_target, dest, true); | |
650 | |
651 // Check whether my target address is valid within this section. | |
652 // If not, strengthen the relocation type to point to another section. | |
653 int sindex = _section; | |
654 if (sindex == CodeBuffer::SECT_NONE && _target != NULL | |
655 && (!dest->allocates(_target) || _target == dest->locs_point())) { | |
656 sindex = dest->outer()->section_index_of(_target); | |
657 guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere"); | |
658 relocInfo* base = dest->locs_end() - 1; | |
659 assert(base->type() == this->type(), "sanity"); | |
660 // Change the written type, to be section_word_type instead. | |
661 base->set_type(relocInfo::section_word_type); | |
662 } | |
663 | |
664 // Note: An internal_word relocation cannot refer to its own instruction, | |
665 // because we reserve "0" to mean that the pointer itself is embedded | |
666 // in the code stream. We use a section_word relocation for such cases. | |
667 | |
668 if (sindex == CodeBuffer::SECT_NONE) { | |
669 assert(type() == relocInfo::internal_word_type, "must be base class"); | |
670 guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section"); | |
671 jint x0 = scaled_offset_null_special(_target, dest->locs_point()); | |
672 assert(!(x0 == 0 && _target != NULL), "correct encoding of null target"); | |
673 p = pack_1_int_to(p, x0); | |
674 } else { | |
675 assert(_target != NULL, "sanity"); | |
676 CodeSection* sect = dest->outer()->code_section(sindex); | |
677 guarantee(sect->allocates2(_target), "must be in correct section"); | |
678 address base = sect->start(); | |
679 jint offset = scaled_offset(_target, base); | |
680 assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity"); | |
681 assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++"); | |
682 p = pack_1_int_to(p, (offset << section_width) | sindex); | |
683 } | |
684 | |
685 dest->set_locs_end((relocInfo*) p); | |
686 } | |
687 | |
688 | |
689 void internal_word_Relocation::unpack_data() { | |
690 jint x0 = unpack_1_int(); | |
691 _target = x0==0? NULL: address_from_scaled_offset(x0, addr()); | |
692 _section = CodeBuffer::SECT_NONE; | |
693 } | |
694 | |
695 | |
696 void section_word_Relocation::unpack_data() { | |
697 jint x = unpack_1_int(); | |
698 jint offset = (x >> section_width); | |
699 int sindex = (x & ((1<<section_width)-1)); | |
700 address base = binding()->section_start(sindex); | |
701 | |
702 _section = sindex; | |
703 _target = address_from_scaled_offset(offset, base); | |
704 } | |
705 | |
706 | |
707 void breakpoint_Relocation::pack_data_to(CodeSection* dest) { | |
708 short* p = (short*) dest->locs_end(); | |
709 address point = dest->locs_point(); | |
710 | |
711 *p++ = _bits; | |
712 | |
713 assert(_target != NULL, "sanity"); | |
714 | |
715 if (internal()) normalize_address(_target, dest); | |
716 | |
717 jint target_bits = | |
718 (jint)( internal() ? scaled_offset (_target, point) | |
719 : runtime_address_to_index(_target) ); | |
720 if (settable()) { | |
721 // save space for set_target later | |
722 p = add_jint(p, target_bits); | |
723 } else { | |
724 p = add_var_int(p, target_bits); | |
725 } | |
726 | |
727 for (int i = 0; i < instrlen(); i++) { | |
728 // put placeholder words until bytes can be saved | |
729 p = add_short(p, (short)0x7777); | |
730 } | |
731 | |
732 dest->set_locs_end((relocInfo*) p); | |
733 } | |
734 | |
735 | |
736 void breakpoint_Relocation::unpack_data() { | |
737 _bits = live_bits(); | |
738 | |
739 int targetlen = datalen() - 1 - instrlen(); | |
740 jint target_bits = 0; | |
741 if (targetlen == 0) target_bits = 0; | |
742 else if (targetlen == 1) target_bits = *(data()+1); | |
743 else if (targetlen == 2) target_bits = relocInfo::jint_from_data(data()+1); | |
744 else { ShouldNotReachHere(); } | |
745 | |
746 _target = internal() ? address_from_scaled_offset(target_bits, addr()) | |
747 : index_to_runtime_address (target_bits); | |
748 } | |
749 | |
750 | |
751 //// miscellaneous methods | |
752 oop* oop_Relocation::oop_addr() { | |
753 int n = _oop_index; | |
754 if (n == 0) { | |
755 // oop is stored in the code stream | |
756 return (oop*) pd_address_in_code(); | |
757 } else { | |
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758 // oop is stored in table at nmethod::oops_begin |
0 | 759 return code()->oop_addr_at(n); |
760 } | |
761 } | |
762 | |
763 | |
764 oop oop_Relocation::oop_value() { | |
765 oop v = *oop_addr(); | |
766 // clean inline caches store a special pseudo-null | |
767 if (v == (oop)Universe::non_oop_word()) v = NULL; | |
768 return v; | |
769 } | |
770 | |
771 | |
772 void oop_Relocation::fix_oop_relocation() { | |
773 if (!oop_is_immediate()) { | |
774 // get the oop from the pool, and re-insert it into the instruction: | |
775 set_value(value()); | |
776 } | |
777 } | |
778 | |
779 | |
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780 RelocIterator virtual_call_Relocation::parse_ic(nmethod* &nm, address &ic_call, address &first_oop, |
0 | 781 oop* &oop_addr, bool *is_optimized) { |
782 assert(ic_call != NULL, "ic_call address must be set"); | |
783 assert(ic_call != NULL || first_oop != NULL, "must supply a non-null input"); | |
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784 if (nm == NULL) { |
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785 CodeBlob* code; |
0 | 786 if (ic_call != NULL) { |
787 code = CodeCache::find_blob(ic_call); | |
788 } else if (first_oop != NULL) { | |
789 code = CodeCache::find_blob(first_oop); | |
790 } | |
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791 nm = code->as_nmethod_or_null(); |
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792 assert(nm != NULL, "address to parse must be in nmethod"); |
0 | 793 } |
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794 assert(ic_call == NULL || nm->contains(ic_call), "must be in nmethod"); |
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795 assert(first_oop == NULL || nm->contains(first_oop), "must be in nmethod"); |
0 | 796 |
797 address oop_limit = NULL; | |
798 | |
799 if (ic_call != NULL) { | |
800 // search for the ic_call at the given address | |
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801 RelocIterator iter(nm, ic_call, ic_call+1); |
0 | 802 bool ret = iter.next(); |
803 assert(ret == true, "relocInfo must exist at this address"); | |
804 assert(iter.addr() == ic_call, "must find ic_call"); | |
805 if (iter.type() == relocInfo::virtual_call_type) { | |
806 virtual_call_Relocation* r = iter.virtual_call_reloc(); | |
807 first_oop = r->first_oop(); | |
808 oop_limit = r->oop_limit(); | |
809 *is_optimized = false; | |
810 } else { | |
811 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); | |
812 *is_optimized = true; | |
813 oop_addr = NULL; | |
814 first_oop = NULL; | |
815 return iter; | |
816 } | |
817 } | |
818 | |
819 // search for the first_oop, to get its oop_addr | |
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820 RelocIterator all_oops(nm, first_oop); |
0 | 821 RelocIterator iter = all_oops; |
822 iter.set_limit(first_oop+1); | |
823 bool found_oop = false; | |
824 while (iter.next()) { | |
825 if (iter.type() == relocInfo::oop_type) { | |
826 assert(iter.addr() == first_oop, "must find first_oop"); | |
827 oop_addr = iter.oop_reloc()->oop_addr(); | |
828 found_oop = true; | |
829 break; | |
830 } | |
831 } | |
832 assert(found_oop, "must find first_oop"); | |
833 | |
834 bool did_reset = false; | |
835 while (ic_call == NULL) { | |
836 // search forward for the ic_call matching the given first_oop | |
837 while (iter.next()) { | |
838 if (iter.type() == relocInfo::virtual_call_type) { | |
839 virtual_call_Relocation* r = iter.virtual_call_reloc(); | |
840 if (r->first_oop() == first_oop) { | |
841 ic_call = r->addr(); | |
842 oop_limit = r->oop_limit(); | |
843 break; | |
844 } | |
845 } | |
846 } | |
847 guarantee(!did_reset, "cannot find ic_call"); | |
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848 iter = RelocIterator(nm); // search the whole nmethod |
0 | 849 did_reset = true; |
850 } | |
851 | |
852 assert(oop_limit != NULL && first_oop != NULL && ic_call != NULL, ""); | |
853 all_oops.set_limit(oop_limit); | |
854 return all_oops; | |
855 } | |
856 | |
857 | |
858 address virtual_call_Relocation::first_oop() { | |
859 assert(_first_oop != NULL && _first_oop < addr(), "must precede ic_call"); | |
860 return _first_oop; | |
861 } | |
862 | |
863 | |
864 address virtual_call_Relocation::oop_limit() { | |
865 if (_oop_limit == NULL) | |
866 return addr() + NativeCall::instruction_size; | |
867 else | |
868 return _oop_limit; | |
869 } | |
870 | |
871 | |
872 | |
873 void virtual_call_Relocation::clear_inline_cache() { | |
874 // No stubs for ICs | |
875 // Clean IC | |
876 ResourceMark rm; | |
877 CompiledIC* icache = CompiledIC_at(this); | |
878 icache->set_to_clean(); | |
879 } | |
880 | |
881 | |
882 void opt_virtual_call_Relocation::clear_inline_cache() { | |
883 // No stubs for ICs | |
884 // Clean IC | |
885 ResourceMark rm; | |
886 CompiledIC* icache = CompiledIC_at(this); | |
887 icache->set_to_clean(); | |
888 } | |
889 | |
890 | |
891 address opt_virtual_call_Relocation::static_stub() { | |
892 // search for the static stub who points back to this static call | |
893 address static_call_addr = addr(); | |
894 RelocIterator iter(code()); | |
895 while (iter.next()) { | |
896 if (iter.type() == relocInfo::static_stub_type) { | |
897 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
898 return iter.addr(); | |
899 } | |
900 } | |
901 } | |
902 return NULL; | |
903 } | |
904 | |
905 | |
906 void static_call_Relocation::clear_inline_cache() { | |
907 // Safe call site info | |
908 CompiledStaticCall* handler = compiledStaticCall_at(this); | |
909 handler->set_to_clean(); | |
910 } | |
911 | |
912 | |
913 address static_call_Relocation::static_stub() { | |
914 // search for the static stub who points back to this static call | |
915 address static_call_addr = addr(); | |
916 RelocIterator iter(code()); | |
917 while (iter.next()) { | |
918 if (iter.type() == relocInfo::static_stub_type) { | |
919 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
920 return iter.addr(); | |
921 } | |
922 } | |
923 } | |
924 return NULL; | |
925 } | |
926 | |
927 | |
928 void static_stub_Relocation::clear_inline_cache() { | |
929 // Call stub is only used when calling the interpreted code. | |
930 // It does not really need to be cleared, except that we want to clean out the methodoop. | |
931 CompiledStaticCall::set_stub_to_clean(this); | |
932 } | |
933 | |
934 | |
935 void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
936 address target = _target; | |
937 if (target == NULL) { | |
938 // An absolute embedded reference to an external location, | |
939 // which means there is nothing to fix here. | |
940 return; | |
941 } | |
942 // Probably this reference is absolute, not relative, so the | |
943 // following is probably a no-op. | |
944 assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity"); | |
945 set_value(target); | |
946 } | |
947 | |
948 | |
949 address external_word_Relocation::target() { | |
950 address target = _target; | |
951 if (target == NULL) { | |
952 target = pd_get_address_from_code(); | |
953 } | |
954 return target; | |
955 } | |
956 | |
957 | |
958 void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
959 address target = _target; | |
960 if (target == NULL) { | |
961 if (addr_in_const()) { | |
962 target = new_addr_for(*(address*)addr(), src, dest); | |
963 } else { | |
964 target = new_addr_for(pd_get_address_from_code(), src, dest); | |
965 } | |
966 } | |
967 set_value(target); | |
968 } | |
969 | |
970 | |
971 address internal_word_Relocation::target() { | |
972 address target = _target; | |
973 if (target == NULL) { | |
974 target = pd_get_address_from_code(); | |
975 } | |
976 return target; | |
977 } | |
978 | |
979 | |
980 breakpoint_Relocation::breakpoint_Relocation(int kind, address target, bool internal) { | |
981 bool active = false; | |
982 bool enabled = (kind == initialization); | |
983 bool removable = (kind != safepoint); | |
984 bool settable = (target == NULL); | |
985 | |
986 int bits = kind; | |
987 if (enabled) bits |= enabled_state; | |
988 if (internal) bits |= internal_attr; | |
989 if (removable) bits |= removable_attr; | |
990 if (settable) bits |= settable_attr; | |
991 | |
992 _bits = bits | high_bit; | |
993 _target = target; | |
994 | |
995 assert(this->kind() == kind, "kind encoded"); | |
996 assert(this->enabled() == enabled, "enabled encoded"); | |
997 assert(this->active() == active, "active encoded"); | |
998 assert(this->internal() == internal, "internal encoded"); | |
999 assert(this->removable() == removable, "removable encoded"); | |
1000 assert(this->settable() == settable, "settable encoded"); | |
1001 } | |
1002 | |
1003 | |
1004 address breakpoint_Relocation::target() const { | |
1005 return _target; | |
1006 } | |
1007 | |
1008 | |
1009 void breakpoint_Relocation::set_target(address x) { | |
1010 assert(settable(), "must be settable"); | |
1011 jint target_bits = | |
1012 (jint)(internal() ? scaled_offset (x, addr()) | |
1013 : runtime_address_to_index(x)); | |
1014 short* p = &live_bits() + 1; | |
1015 p = add_jint(p, target_bits); | |
1016 assert(p == instrs(), "new target must fit"); | |
1017 _target = x; | |
1018 } | |
1019 | |
1020 | |
1021 void breakpoint_Relocation::set_enabled(bool b) { | |
1022 if (enabled() == b) return; | |
1023 | |
1024 if (b) { | |
1025 set_bits(bits() | enabled_state); | |
1026 } else { | |
1027 set_active(false); // remove the actual breakpoint insn, if any | |
1028 set_bits(bits() & ~enabled_state); | |
1029 } | |
1030 } | |
1031 | |
1032 | |
1033 void breakpoint_Relocation::set_active(bool b) { | |
1034 assert(!b || enabled(), "cannot activate a disabled breakpoint"); | |
1035 | |
1036 if (active() == b) return; | |
1037 | |
1038 // %%% should probably seize a lock here (might not be the right lock) | |
1039 //MutexLockerEx ml_patch(Patching_lock, true); | |
1040 //if (active() == b) return; // recheck state after locking | |
1041 | |
1042 if (b) { | |
1043 set_bits(bits() | active_state); | |
1044 if (instrlen() == 0) | |
1045 fatal("breakpoints in original code must be undoable"); | |
1046 pd_swap_in_breakpoint (addr(), instrs(), instrlen()); | |
1047 } else { | |
1048 set_bits(bits() & ~active_state); | |
1049 pd_swap_out_breakpoint(addr(), instrs(), instrlen()); | |
1050 } | |
1051 } | |
1052 | |
1053 | |
1054 //--------------------------------------------------------------------------------- | |
1055 // Non-product code | |
1056 | |
1057 #ifndef PRODUCT | |
1058 | |
1059 static const char* reloc_type_string(relocInfo::relocType t) { | |
1060 switch (t) { | |
1061 #define EACH_CASE(name) \ | |
1062 case relocInfo::name##_type: \ | |
1063 return #name; | |
1064 | |
1065 APPLY_TO_RELOCATIONS(EACH_CASE); | |
1066 #undef EACH_CASE | |
1067 | |
1068 case relocInfo::none: | |
1069 return "none"; | |
1070 case relocInfo::data_prefix_tag: | |
1071 return "prefix"; | |
1072 default: | |
1073 return "UNKNOWN RELOC TYPE"; | |
1074 } | |
1075 } | |
1076 | |
1077 | |
1078 void RelocIterator::print_current() { | |
1079 if (!has_current()) { | |
1080 tty->print_cr("(no relocs)"); | |
1081 return; | |
1082 } | |
1083 tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT, | |
1084 _current, type(), reloc_type_string((relocInfo::relocType) type()), _addr); | |
1085 if (current()->format() != 0) | |
1086 tty->print(" format=%d", current()->format()); | |
1087 if (datalen() == 1) { | |
1088 tty->print(" data=%d", data()[0]); | |
1089 } else if (datalen() > 0) { | |
1090 tty->print(" data={"); | |
1091 for (int i = 0; i < datalen(); i++) { | |
1092 tty->print("%04x", data()[i] & 0xFFFF); | |
1093 } | |
1094 tty->print("}"); | |
1095 } | |
1096 tty->print("]"); | |
1097 switch (type()) { | |
1098 case relocInfo::oop_type: | |
1099 { | |
1100 oop_Relocation* r = oop_reloc(); | |
1101 oop* oop_addr = NULL; | |
1102 oop raw_oop = NULL; | |
1103 oop oop_value = NULL; | |
1104 if (code() != NULL || r->oop_is_immediate()) { | |
1105 oop_addr = r->oop_addr(); | |
1106 raw_oop = *oop_addr; | |
1107 oop_value = r->oop_value(); | |
1108 } | |
1109 tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", | |
1110 oop_addr, (address)raw_oop, r->offset()); | |
1111 // Do not print the oop by default--we want this routine to | |
1112 // work even during GC or other inconvenient times. | |
1113 if (WizardMode && oop_value != NULL) { | |
1114 tty->print("oop_value=" INTPTR_FORMAT ": ", (address)oop_value); | |
1115 oop_value->print_value_on(tty); | |
1116 } | |
1117 break; | |
1118 } | |
1119 case relocInfo::external_word_type: | |
1120 case relocInfo::internal_word_type: | |
1121 case relocInfo::section_word_type: | |
1122 { | |
1123 DataRelocation* r = (DataRelocation*) reloc(); | |
1124 tty->print(" | [target=" INTPTR_FORMAT "]", r->value()); //value==target | |
1125 break; | |
1126 } | |
1127 case relocInfo::static_call_type: | |
1128 case relocInfo::runtime_call_type: | |
1129 { | |
1130 CallRelocation* r = (CallRelocation*) reloc(); | |
1131 tty->print(" | [destination=" INTPTR_FORMAT "]", r->destination()); | |
1132 break; | |
1133 } | |
1134 case relocInfo::virtual_call_type: | |
1135 { | |
1136 virtual_call_Relocation* r = (virtual_call_Relocation*) reloc(); | |
1137 tty->print(" | [destination=" INTPTR_FORMAT " first_oop=" INTPTR_FORMAT " oop_limit=" INTPTR_FORMAT "]", | |
1138 r->destination(), r->first_oop(), r->oop_limit()); | |
1139 break; | |
1140 } | |
1141 case relocInfo::static_stub_type: | |
1142 { | |
1143 static_stub_Relocation* r = (static_stub_Relocation*) reloc(); | |
1144 tty->print(" | [static_call=" INTPTR_FORMAT "]", r->static_call()); | |
1145 break; | |
1146 } | |
1147 } | |
1148 tty->cr(); | |
1149 } | |
1150 | |
1151 | |
1152 void RelocIterator::print() { | |
1153 RelocIterator save_this = (*this); | |
1154 relocInfo* scan = _current; | |
1155 if (!has_current()) scan += 1; // nothing to scan here! | |
1156 | |
1157 bool skip_next = has_current(); | |
1158 bool got_next; | |
1159 while (true) { | |
1160 got_next = (skip_next || next()); | |
1161 skip_next = false; | |
1162 | |
1163 tty->print(" @" INTPTR_FORMAT ": ", scan); | |
1164 relocInfo* newscan = _current+1; | |
1165 if (!has_current()) newscan -= 1; // nothing to scan here! | |
1166 while (scan < newscan) { | |
1167 tty->print("%04x", *(short*)scan & 0xFFFF); | |
1168 scan++; | |
1169 } | |
1170 tty->cr(); | |
1171 | |
1172 if (!got_next) break; | |
1173 print_current(); | |
1174 } | |
1175 | |
1176 (*this) = save_this; | |
1177 } | |
1178 | |
1179 // For the debugger: | |
1180 extern "C" | |
1563
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1181 void print_blob_locs(nmethod* nm) { |
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1182 nm->print(); |
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1183 RelocIterator iter(nm); |
0 | 1184 iter.print(); |
1185 } | |
1186 extern "C" | |
1187 void print_buf_locs(CodeBuffer* cb) { | |
1188 FlagSetting fs(PrintRelocations, true); | |
1189 cb->print(); | |
1190 } | |
1191 #endif // !PRODUCT |