Mercurial > hg > truffle
annotate src/share/vm/code/relocInfo.cpp @ 7458:4daebd4cc1dd
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author | minqi |
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date | Mon, 24 Dec 2012 11:46:38 -0800 |
parents | cd3d6a6b95d9 |
children | 7875ea94bea5 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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" |
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26 #include "code/codeCache.hpp" |
1972 | 27 #include "code/compiledIC.hpp" |
28 #include "code/nmethod.hpp" | |
29 #include "code/relocInfo.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "runtime/stubCodeGenerator.hpp" | |
32 #include "utilities/copy.hpp" | |
0 | 33 |
34 | |
35 const RelocationHolder RelocationHolder::none; // its type is relocInfo::none | |
36 | |
37 | |
38 // Implementation of relocInfo | |
39 | |
40 #ifdef ASSERT | |
41 relocInfo::relocInfo(relocType t, int off, int f) { | |
42 assert(t != data_prefix_tag, "cannot build a prefix this way"); | |
43 assert((t & type_mask) == t, "wrong type"); | |
44 assert((f & format_mask) == f, "wrong format"); | |
45 assert(off >= 0 && off < offset_limit(), "offset out off bounds"); | |
46 assert((off & (offset_unit-1)) == 0, "misaligned offset"); | |
47 (*this) = relocInfo(t, RAW_BITS, off, f); | |
48 } | |
49 #endif | |
50 | |
51 void relocInfo::initialize(CodeSection* dest, Relocation* reloc) { | |
52 relocInfo* data = this+1; // here's where the data might go | |
53 dest->set_locs_end(data); // sync end: the next call may read dest.locs_end | |
54 reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end | |
55 relocInfo* data_limit = dest->locs_end(); | |
56 if (data_limit > data) { | |
57 relocInfo suffix = (*this); | |
58 data_limit = this->finish_prefix((short*) data_limit); | |
59 // Finish up with the suffix. (Hack note: pack_data_to might edit this.) | |
60 *data_limit = suffix; | |
61 dest->set_locs_end(data_limit+1); | |
62 } | |
63 } | |
64 | |
65 relocInfo* relocInfo::finish_prefix(short* prefix_limit) { | |
66 assert(sizeof(relocInfo) == sizeof(short), "change this code"); | |
67 short* p = (short*)(this+1); | |
68 assert(prefix_limit >= p, "must be a valid span of data"); | |
69 int plen = prefix_limit - p; | |
70 if (plen == 0) { | |
71 debug_only(_value = 0xFFFF); | |
72 return this; // no data: remove self completely | |
73 } | |
74 if (plen == 1 && fits_into_immediate(p[0])) { | |
75 (*this) = immediate_relocInfo(p[0]); // move data inside self | |
76 return this+1; | |
77 } | |
78 // cannot compact, so just update the count and return the limit pointer | |
79 (*this) = prefix_relocInfo(plen); // write new datalen | |
80 assert(data() + datalen() == prefix_limit, "pointers must line up"); | |
81 return (relocInfo*)prefix_limit; | |
82 } | |
83 | |
84 | |
85 void relocInfo::set_type(relocType t) { | |
86 int old_offset = addr_offset(); | |
87 int old_format = format(); | |
88 (*this) = relocInfo(t, old_offset, old_format); | |
89 assert(type()==(int)t, "sanity check"); | |
90 assert(addr_offset()==old_offset, "sanity check"); | |
91 assert(format()==old_format, "sanity check"); | |
92 } | |
93 | |
94 | |
95 void relocInfo::set_format(int f) { | |
96 int old_offset = addr_offset(); | |
97 assert((f & format_mask) == f, "wrong format"); | |
98 _value = (_value & ~(format_mask << offset_width)) | (f << offset_width); | |
99 assert(addr_offset()==old_offset, "sanity check"); | |
100 } | |
101 | |
102 | |
103 void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) { | |
104 bool found = false; | |
105 while (itr->next() && !found) { | |
106 if (itr->addr() == pc) { | |
107 assert(itr->type()==old_type, "wrong relocInfo type found"); | |
108 itr->current()->set_type(new_type); | |
109 found=true; | |
110 } | |
111 } | |
112 assert(found, "no relocInfo found for pc"); | |
113 } | |
114 | |
115 | |
116 void relocInfo::remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type) { | |
117 change_reloc_info_for_address(itr, pc, old_type, none); | |
118 } | |
119 | |
120 | |
121 // ---------------------------------------------------------------------------------------------------- | |
122 // Implementation of RelocIterator | |
123 | |
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124 void RelocIterator::initialize(nmethod* nm, address begin, address limit) { |
0 | 125 initialize_misc(); |
126 | |
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127 if (nm == NULL && begin != NULL) { |
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128 // allow nmethod to be deduced from beginning address |
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129 CodeBlob* cb = CodeCache::find_blob(begin); |
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130 nm = cb->as_nmethod_or_null(); |
0 | 131 } |
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132 assert(nm != NULL, "must be able to deduce nmethod from other arguments"); |
0 | 133 |
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134 _code = nm; |
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135 _current = nm->relocation_begin() - 1; |
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136 _end = nm->relocation_end(); |
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137 _addr = nm->content_begin(); |
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138 |
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139 // Initialize code sections. |
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140 _section_start[CodeBuffer::SECT_CONSTS] = nm->consts_begin(); |
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141 _section_start[CodeBuffer::SECT_INSTS ] = nm->insts_begin() ; |
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142 _section_start[CodeBuffer::SECT_STUBS ] = nm->stub_begin() ; |
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143 |
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144 _section_end [CodeBuffer::SECT_CONSTS] = nm->consts_end() ; |
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145 _section_end [CodeBuffer::SECT_INSTS ] = nm->insts_end() ; |
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146 _section_end [CodeBuffer::SECT_STUBS ] = nm->stub_end() ; |
0 | 147 |
148 assert(!has_current(), "just checking"); | |
1748 | 149 assert(begin == NULL || begin >= nm->code_begin(), "in bounds"); |
150 assert(limit == NULL || limit <= nm->code_end(), "in bounds"); | |
0 | 151 set_limits(begin, limit); |
152 } | |
153 | |
154 | |
155 RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) { | |
156 initialize_misc(); | |
157 | |
158 _current = cs->locs_start()-1; | |
159 _end = cs->locs_end(); | |
160 _addr = cs->start(); | |
161 _code = NULL; // Not cb->blob(); | |
162 | |
163 CodeBuffer* cb = cs->outer(); | |
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164 assert((int) SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal"); |
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165 for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) { |
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166 CodeSection* cs = cb->code_section(n); |
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167 _section_start[n] = cs->start(); |
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168 _section_end [n] = cs->end(); |
0 | 169 } |
170 | |
171 assert(!has_current(), "just checking"); | |
172 | |
173 assert(begin == NULL || begin >= cs->start(), "in bounds"); | |
174 assert(limit == NULL || limit <= cs->end(), "in bounds"); | |
175 set_limits(begin, limit); | |
176 } | |
177 | |
178 | |
179 enum { indexCardSize = 128 }; | |
180 struct RelocIndexEntry { | |
181 jint addr_offset; // offset from header_end of an addr() | |
182 jint reloc_offset; // offset from header_end of a relocInfo (prefix) | |
183 }; | |
184 | |
185 | |
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186 bool RelocIterator::addr_in_const() const { |
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187 const int n = CodeBuffer::SECT_CONSTS; |
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188 return section_start(n) <= addr() && addr() < section_end(n); |
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189 } |
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190 |
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191 |
0 | 192 static inline int num_cards(int code_size) { |
193 return (code_size-1) / indexCardSize; | |
194 } | |
195 | |
196 | |
197 int RelocIterator::locs_and_index_size(int code_size, int locs_size) { | |
198 if (!UseRelocIndex) return locs_size; // no index | |
199 code_size = round_to(code_size, oopSize); | |
200 locs_size = round_to(locs_size, oopSize); | |
201 int index_size = num_cards(code_size) * sizeof(RelocIndexEntry); | |
202 // format of indexed relocs: | |
203 // relocation_begin: relocInfo ... | |
204 // index: (addr,reloc#) ... | |
205 // indexSize :relocation_end | |
206 return locs_size + index_size + BytesPerInt; | |
207 } | |
208 | |
209 | |
210 void RelocIterator::create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end) { | |
211 address relocation_begin = (address)dest_begin; | |
212 address relocation_end = (address)dest_end; | |
213 int total_size = relocation_end - relocation_begin; | |
214 int locs_size = dest_count * sizeof(relocInfo); | |
215 if (!UseRelocIndex) { | |
216 Copy::fill_to_bytes(relocation_begin + locs_size, total_size-locs_size, 0); | |
217 return; | |
218 } | |
219 int index_size = total_size - locs_size - BytesPerInt; // find out how much space is left | |
220 int ncards = index_size / sizeof(RelocIndexEntry); | |
221 assert(total_size == locs_size + index_size + BytesPerInt, "checkin'"); | |
222 assert(index_size >= 0 && index_size % sizeof(RelocIndexEntry) == 0, "checkin'"); | |
223 jint* index_size_addr = (jint*)relocation_end - 1; | |
224 | |
225 assert(sizeof(jint) == BytesPerInt, "change this code"); | |
226 | |
227 *index_size_addr = index_size; | |
228 if (index_size != 0) { | |
229 assert(index_size > 0, "checkin'"); | |
230 | |
231 RelocIndexEntry* index = (RelocIndexEntry *)(relocation_begin + locs_size); | |
232 assert(index == (RelocIndexEntry*)index_size_addr - ncards, "checkin'"); | |
233 | |
234 // walk over the relocations, and fill in index entries as we go | |
235 RelocIterator iter; | |
236 const address initial_addr = NULL; | |
237 relocInfo* const initial_current = dest_begin - 1; // biased by -1 like elsewhere | |
238 | |
239 iter._code = NULL; | |
240 iter._addr = initial_addr; | |
241 iter._limit = (address)(intptr_t)(ncards * indexCardSize); | |
242 iter._current = initial_current; | |
243 iter._end = dest_begin + dest_count; | |
244 | |
245 int i = 0; | |
246 address next_card_addr = (address)indexCardSize; | |
247 int addr_offset = 0; | |
248 int reloc_offset = 0; | |
249 while (true) { | |
250 // Checkpoint the iterator before advancing it. | |
251 addr_offset = iter._addr - initial_addr; | |
252 reloc_offset = iter._current - initial_current; | |
253 if (!iter.next()) break; | |
254 while (iter.addr() >= next_card_addr) { | |
255 index[i].addr_offset = addr_offset; | |
256 index[i].reloc_offset = reloc_offset; | |
257 i++; | |
258 next_card_addr += indexCardSize; | |
259 } | |
260 } | |
261 while (i < ncards) { | |
262 index[i].addr_offset = addr_offset; | |
263 index[i].reloc_offset = reloc_offset; | |
264 i++; | |
265 } | |
266 } | |
267 } | |
268 | |
269 | |
270 void RelocIterator::set_limits(address begin, address limit) { | |
271 int index_size = 0; | |
272 if (UseRelocIndex && _code != NULL) { | |
273 index_size = ((jint*)_end)[-1]; | |
274 _end = (relocInfo*)( (address)_end - index_size - BytesPerInt ); | |
275 } | |
276 | |
277 _limit = limit; | |
278 | |
279 // the limit affects this next stuff: | |
280 if (begin != NULL) { | |
281 #ifdef ASSERT | |
282 // In ASSERT mode we do not actually use the index, but simply | |
283 // check that its contents would have led us to the right answer. | |
284 address addrCheck = _addr; | |
285 relocInfo* infoCheck = _current; | |
286 #endif // ASSERT | |
287 if (index_size > 0) { | |
288 // skip ahead | |
289 RelocIndexEntry* index = (RelocIndexEntry*)_end; | |
290 RelocIndexEntry* index_limit = (RelocIndexEntry*)((address)index + index_size); | |
1748 | 291 assert(_addr == _code->code_begin(), "_addr must be unadjusted"); |
0 | 292 int card = (begin - _addr) / indexCardSize; |
293 if (card > 0) { | |
294 if (index+card-1 < index_limit) index += card-1; | |
295 else index = index_limit - 1; | |
296 #ifdef ASSERT | |
297 addrCheck = _addr + index->addr_offset; | |
298 infoCheck = _current + index->reloc_offset; | |
299 #else | |
300 // Advance the iterator immediately to the last valid state | |
301 // for the previous card. Calling "next" will then advance | |
302 // it to the first item on the required card. | |
303 _addr += index->addr_offset; | |
304 _current += index->reloc_offset; | |
305 #endif // ASSERT | |
306 } | |
307 } | |
308 | |
309 relocInfo* backup; | |
310 address backup_addr; | |
311 while (true) { | |
312 backup = _current; | |
313 backup_addr = _addr; | |
314 #ifdef ASSERT | |
315 if (backup == infoCheck) { | |
316 assert(backup_addr == addrCheck, "must match"); addrCheck = NULL; infoCheck = NULL; | |
317 } else { | |
318 assert(addrCheck == NULL || backup_addr <= addrCheck, "must not pass addrCheck"); | |
319 } | |
320 #endif // ASSERT | |
321 if (!next() || addr() >= begin) break; | |
322 } | |
323 assert(addrCheck == NULL || addrCheck == backup_addr, "must have matched addrCheck"); | |
324 assert(infoCheck == NULL || infoCheck == backup, "must have matched infoCheck"); | |
325 // At this point, either we are at the first matching record, | |
326 // or else there is no such record, and !has_current(). | |
327 // In either case, revert to the immediatly preceding state. | |
328 _current = backup; | |
329 _addr = backup_addr; | |
330 set_has_current(false); | |
331 } | |
332 } | |
333 | |
334 | |
335 void RelocIterator::set_limit(address limit) { | |
336 address code_end = (address)code() + code()->size(); | |
337 assert(limit == NULL || limit <= code_end, "in bounds"); | |
338 _limit = limit; | |
339 } | |
340 | |
341 | |
342 void PatchingRelocIterator:: prepass() { | |
343 // turn breakpoints off during patching | |
344 _init_state = (*this); // save cursor | |
345 while (next()) { | |
346 if (type() == relocInfo::breakpoint_type) { | |
347 breakpoint_reloc()->set_active(false); | |
348 } | |
349 } | |
350 (RelocIterator&)(*this) = _init_state; // reset cursor for client | |
351 } | |
352 | |
353 | |
354 void PatchingRelocIterator:: postpass() { | |
355 // turn breakpoints back on after patching | |
356 (RelocIterator&)(*this) = _init_state; // reset cursor again | |
357 while (next()) { | |
358 if (type() == relocInfo::breakpoint_type) { | |
359 breakpoint_Relocation* bpt = breakpoint_reloc(); | |
360 bpt->set_active(bpt->enabled()); | |
361 } | |
362 } | |
363 } | |
364 | |
365 | |
366 // All the strange bit-encodings are in here. | |
367 // The idea is to encode relocation data which are small integers | |
368 // very efficiently (a single extra halfword). Larger chunks of | |
369 // relocation data need a halfword header to hold their size. | |
370 void RelocIterator::advance_over_prefix() { | |
371 if (_current->is_datalen()) { | |
372 _data = (short*) _current->data(); | |
373 _datalen = _current->datalen(); | |
374 _current += _datalen + 1; // skip the embedded data & header | |
375 } else { | |
376 _databuf = _current->immediate(); | |
377 _data = &_databuf; | |
378 _datalen = 1; | |
379 _current++; // skip the header | |
380 } | |
381 // The client will see the following relocInfo, whatever that is. | |
382 // It is the reloc to which the preceding data applies. | |
383 } | |
384 | |
385 | |
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386 void RelocIterator::initialize_misc() { |
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387 set_has_current(false); |
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388 for (int i = (int) CodeBuffer::SECT_FIRST; i < (int) CodeBuffer::SECT_LIMIT; i++) { |
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389 _section_start[i] = NULL; // these will be lazily computed, if needed |
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390 _section_end [i] = NULL; |
0 | 391 } |
392 } | |
393 | |
394 | |
395 Relocation* RelocIterator::reloc() { | |
396 // (take the "switch" out-of-line) | |
397 relocInfo::relocType t = type(); | |
398 if (false) {} | |
399 #define EACH_TYPE(name) \ | |
400 else if (t == relocInfo::name##_type) { \ | |
401 return name##_reloc(); \ | |
402 } | |
403 APPLY_TO_RELOCATIONS(EACH_TYPE); | |
404 #undef EACH_TYPE | |
405 assert(t == relocInfo::none, "must be padding"); | |
406 return new(_rh) Relocation(); | |
407 } | |
408 | |
409 | |
410 //////// Methods for flyweight Relocation types | |
411 | |
412 | |
413 RelocationHolder RelocationHolder::plus(int offset) const { | |
414 if (offset != 0) { | |
415 switch (type()) { | |
416 case relocInfo::none: | |
417 break; | |
418 case relocInfo::oop_type: | |
419 { | |
420 oop_Relocation* r = (oop_Relocation*)reloc(); | |
421 return oop_Relocation::spec(r->oop_index(), r->offset() + offset); | |
422 } | |
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423 case relocInfo::metadata_type: |
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424 { |
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425 metadata_Relocation* r = (metadata_Relocation*)reloc(); |
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426 return metadata_Relocation::spec(r->metadata_index(), r->offset() + offset); |
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427 } |
0 | 428 default: |
429 ShouldNotReachHere(); | |
430 } | |
431 } | |
432 return (*this); | |
433 } | |
434 | |
435 | |
436 void Relocation::guarantee_size() { | |
437 guarantee(false, "Make _relocbuf bigger!"); | |
438 } | |
439 | |
440 // some relocations can compute their own values | |
441 address Relocation::value() { | |
442 ShouldNotReachHere(); | |
443 return NULL; | |
444 } | |
445 | |
446 | |
447 void Relocation::set_value(address x) { | |
448 ShouldNotReachHere(); | |
449 } | |
450 | |
451 | |
452 RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) { | |
453 if (rtype == relocInfo::none) return RelocationHolder::none; | |
454 relocInfo ri = relocInfo(rtype, 0); | |
455 RelocIterator itr; | |
456 itr.set_current(ri); | |
457 itr.reloc(); | |
458 return itr._rh; | |
459 } | |
460 | |
461 int32_t Relocation::runtime_address_to_index(address runtime_address) { | |
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462 assert(!is_reloc_index((intptr_t)runtime_address), "must not look like an index"); |
0 | 463 |
464 if (runtime_address == NULL) return 0; | |
465 | |
466 StubCodeDesc* p = StubCodeDesc::desc_for(runtime_address); | |
467 if (p != NULL && p->begin() == runtime_address) { | |
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468 assert(is_reloc_index(p->index()), "there must not be too many stubs"); |
0 | 469 return (int32_t)p->index(); |
470 } else { | |
471 // Known "miscellaneous" non-stub pointers: | |
472 // os::get_polling_page(), SafepointSynchronize::address_of_state() | |
473 if (PrintRelocations) { | |
474 tty->print_cr("random unregistered address in relocInfo: " INTPTR_FORMAT, runtime_address); | |
475 } | |
476 #ifndef _LP64 | |
477 return (int32_t) (intptr_t)runtime_address; | |
478 #else | |
479 // didn't fit return non-index | |
480 return -1; | |
481 #endif /* _LP64 */ | |
482 } | |
483 } | |
484 | |
485 | |
486 address Relocation::index_to_runtime_address(int32_t index) { | |
487 if (index == 0) return NULL; | |
488 | |
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489 if (is_reloc_index(index)) { |
0 | 490 StubCodeDesc* p = StubCodeDesc::desc_for_index(index); |
491 assert(p != NULL, "there must be a stub for this index"); | |
492 return p->begin(); | |
493 } else { | |
494 #ifndef _LP64 | |
495 // this only works on 32bit machines | |
496 return (address) ((intptr_t) index); | |
497 #else | |
498 fatal("Relocation::index_to_runtime_address, int32_t not pointer sized"); | |
499 return NULL; | |
500 #endif /* _LP64 */ | |
501 } | |
502 } | |
503 | |
504 address Relocation::old_addr_for(address newa, | |
505 const CodeBuffer* src, CodeBuffer* dest) { | |
506 int sect = dest->section_index_of(newa); | |
507 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
508 address ostart = src->code_section(sect)->start(); | |
509 address nstart = dest->code_section(sect)->start(); | |
510 return ostart + (newa - nstart); | |
511 } | |
512 | |
513 address Relocation::new_addr_for(address olda, | |
514 const CodeBuffer* src, CodeBuffer* dest) { | |
515 debug_only(const CodeBuffer* src0 = src); | |
516 int sect = CodeBuffer::SECT_NONE; | |
517 // Look for olda in the source buffer, and all previous incarnations | |
518 // if the source buffer has been expanded. | |
519 for (; src != NULL; src = src->before_expand()) { | |
520 sect = src->section_index_of(olda); | |
521 if (sect != CodeBuffer::SECT_NONE) break; | |
522 } | |
523 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
524 address ostart = src->code_section(sect)->start(); | |
525 address nstart = dest->code_section(sect)->start(); | |
526 return nstart + (olda - ostart); | |
527 } | |
528 | |
529 void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) { | |
530 address addr0 = addr; | |
531 if (addr0 == NULL || dest->allocates2(addr0)) return; | |
532 CodeBuffer* cb = dest->outer(); | |
533 addr = new_addr_for(addr0, cb, cb); | |
534 assert(allow_other_sections || dest->contains2(addr), | |
535 "addr must be in required section"); | |
536 } | |
537 | |
538 | |
539 void CallRelocation::set_destination(address x) { | |
540 pd_set_call_destination(x); | |
541 } | |
542 | |
543 void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
544 // Usually a self-relative reference to an external routine. | |
545 // On some platforms, the reference is absolute (not self-relative). | |
546 // The enhanced use of pd_call_destination sorts this all out. | |
547 address orig_addr = old_addr_for(addr(), src, dest); | |
548 address callee = pd_call_destination(orig_addr); | |
549 // Reassert the callee address, this time in the new copy of the code. | |
550 pd_set_call_destination(callee); | |
551 } | |
552 | |
553 | |
554 //// pack/unpack methods | |
555 | |
556 void oop_Relocation::pack_data_to(CodeSection* dest) { | |
557 short* p = (short*) dest->locs_end(); | |
558 p = pack_2_ints_to(p, _oop_index, _offset); | |
559 dest->set_locs_end((relocInfo*) p); | |
560 } | |
561 | |
562 | |
563 void oop_Relocation::unpack_data() { | |
564 unpack_2_ints(_oop_index, _offset); | |
565 } | |
566 | |
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567 void metadata_Relocation::pack_data_to(CodeSection* dest) { |
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568 short* p = (short*) dest->locs_end(); |
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569 p = pack_2_ints_to(p, _metadata_index, _offset); |
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570 dest->set_locs_end((relocInfo*) p); |
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571 } |
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572 |
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573 |
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574 void metadata_Relocation::unpack_data() { |
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575 unpack_2_ints(_metadata_index, _offset); |
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576 } |
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577 |
0 | 578 |
579 void virtual_call_Relocation::pack_data_to(CodeSection* dest) { | |
580 short* p = (short*) dest->locs_end(); | |
581 address point = dest->locs_point(); | |
582 | |
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583 normalize_address(_cached_value, dest); |
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584 jint x0 = scaled_offset_null_special(_cached_value, point); |
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585 p = pack_1_int_to(p, x0); |
0 | 586 dest->set_locs_end((relocInfo*) p); |
587 } | |
588 | |
589 | |
590 void virtual_call_Relocation::unpack_data() { | |
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591 jint x0 = unpack_1_int(); |
0 | 592 address point = addr(); |
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593 _cached_value = x0==0? NULL: address_from_scaled_offset(x0, point); |
0 | 594 } |
595 | |
596 | |
597 void static_stub_Relocation::pack_data_to(CodeSection* dest) { | |
598 short* p = (short*) dest->locs_end(); | |
599 CodeSection* insts = dest->outer()->insts(); | |
600 normalize_address(_static_call, insts); | |
601 p = pack_1_int_to(p, scaled_offset(_static_call, insts->start())); | |
602 dest->set_locs_end((relocInfo*) p); | |
603 } | |
604 | |
605 void static_stub_Relocation::unpack_data() { | |
606 address base = binding()->section_start(CodeBuffer::SECT_INSTS); | |
607 _static_call = address_from_scaled_offset(unpack_1_int(), base); | |
608 } | |
609 | |
610 | |
611 void external_word_Relocation::pack_data_to(CodeSection* dest) { | |
612 short* p = (short*) dest->locs_end(); | |
613 int32_t index = runtime_address_to_index(_target); | |
614 #ifndef _LP64 | |
615 p = pack_1_int_to(p, index); | |
616 #else | |
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617 if (is_reloc_index(index)) { |
0 | 618 p = pack_2_ints_to(p, index, 0); |
619 } else { | |
620 jlong t = (jlong) _target; | |
621 int32_t lo = low(t); | |
622 int32_t hi = high(t); | |
623 p = pack_2_ints_to(p, lo, hi); | |
624 DEBUG_ONLY(jlong t1 = jlong_from(hi, lo)); | |
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625 assert(!is_reloc_index(t1) && (address) t1 == _target, "not symmetric"); |
0 | 626 } |
627 #endif /* _LP64 */ | |
628 dest->set_locs_end((relocInfo*) p); | |
629 } | |
630 | |
631 | |
632 void external_word_Relocation::unpack_data() { | |
633 #ifndef _LP64 | |
634 _target = index_to_runtime_address(unpack_1_int()); | |
635 #else | |
636 int32_t lo, hi; | |
637 unpack_2_ints(lo, hi); | |
638 jlong t = jlong_from(hi, lo);; | |
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639 if (is_reloc_index(t)) { |
0 | 640 _target = index_to_runtime_address(t); |
641 } else { | |
642 _target = (address) t; | |
643 } | |
644 #endif /* _LP64 */ | |
645 } | |
646 | |
647 | |
648 void internal_word_Relocation::pack_data_to(CodeSection* dest) { | |
649 short* p = (short*) dest->locs_end(); | |
650 normalize_address(_target, dest, true); | |
651 | |
652 // Check whether my target address is valid within this section. | |
653 // If not, strengthen the relocation type to point to another section. | |
654 int sindex = _section; | |
655 if (sindex == CodeBuffer::SECT_NONE && _target != NULL | |
656 && (!dest->allocates(_target) || _target == dest->locs_point())) { | |
657 sindex = dest->outer()->section_index_of(_target); | |
658 guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere"); | |
659 relocInfo* base = dest->locs_end() - 1; | |
660 assert(base->type() == this->type(), "sanity"); | |
661 // Change the written type, to be section_word_type instead. | |
662 base->set_type(relocInfo::section_word_type); | |
663 } | |
664 | |
665 // Note: An internal_word relocation cannot refer to its own instruction, | |
666 // because we reserve "0" to mean that the pointer itself is embedded | |
667 // in the code stream. We use a section_word relocation for such cases. | |
668 | |
669 if (sindex == CodeBuffer::SECT_NONE) { | |
670 assert(type() == relocInfo::internal_word_type, "must be base class"); | |
671 guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section"); | |
672 jint x0 = scaled_offset_null_special(_target, dest->locs_point()); | |
673 assert(!(x0 == 0 && _target != NULL), "correct encoding of null target"); | |
674 p = pack_1_int_to(p, x0); | |
675 } else { | |
676 assert(_target != NULL, "sanity"); | |
677 CodeSection* sect = dest->outer()->code_section(sindex); | |
678 guarantee(sect->allocates2(_target), "must be in correct section"); | |
679 address base = sect->start(); | |
680 jint offset = scaled_offset(_target, base); | |
681 assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity"); | |
682 assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++"); | |
683 p = pack_1_int_to(p, (offset << section_width) | sindex); | |
684 } | |
685 | |
686 dest->set_locs_end((relocInfo*) p); | |
687 } | |
688 | |
689 | |
690 void internal_word_Relocation::unpack_data() { | |
691 jint x0 = unpack_1_int(); | |
692 _target = x0==0? NULL: address_from_scaled_offset(x0, addr()); | |
693 _section = CodeBuffer::SECT_NONE; | |
694 } | |
695 | |
696 | |
697 void section_word_Relocation::unpack_data() { | |
698 jint x = unpack_1_int(); | |
699 jint offset = (x >> section_width); | |
700 int sindex = (x & ((1<<section_width)-1)); | |
701 address base = binding()->section_start(sindex); | |
702 | |
703 _section = sindex; | |
704 _target = address_from_scaled_offset(offset, base); | |
705 } | |
706 | |
707 | |
708 void breakpoint_Relocation::pack_data_to(CodeSection* dest) { | |
709 short* p = (short*) dest->locs_end(); | |
710 address point = dest->locs_point(); | |
711 | |
712 *p++ = _bits; | |
713 | |
714 assert(_target != NULL, "sanity"); | |
715 | |
716 if (internal()) normalize_address(_target, dest); | |
717 | |
718 jint target_bits = | |
719 (jint)( internal() ? scaled_offset (_target, point) | |
720 : runtime_address_to_index(_target) ); | |
721 if (settable()) { | |
722 // save space for set_target later | |
723 p = add_jint(p, target_bits); | |
724 } else { | |
725 p = add_var_int(p, target_bits); | |
726 } | |
727 | |
728 for (int i = 0; i < instrlen(); i++) { | |
729 // put placeholder words until bytes can be saved | |
730 p = add_short(p, (short)0x7777); | |
731 } | |
732 | |
733 dest->set_locs_end((relocInfo*) p); | |
734 } | |
735 | |
736 | |
737 void breakpoint_Relocation::unpack_data() { | |
738 _bits = live_bits(); | |
739 | |
740 int targetlen = datalen() - 1 - instrlen(); | |
741 jint target_bits = 0; | |
742 if (targetlen == 0) target_bits = 0; | |
743 else if (targetlen == 1) target_bits = *(data()+1); | |
744 else if (targetlen == 2) target_bits = relocInfo::jint_from_data(data()+1); | |
745 else { ShouldNotReachHere(); } | |
746 | |
747 _target = internal() ? address_from_scaled_offset(target_bits, addr()) | |
748 : index_to_runtime_address (target_bits); | |
749 } | |
750 | |
751 | |
752 //// miscellaneous methods | |
753 oop* oop_Relocation::oop_addr() { | |
754 int n = _oop_index; | |
755 if (n == 0) { | |
756 // oop is stored in the code stream | |
757 return (oop*) pd_address_in_code(); | |
758 } else { | |
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759 // oop is stored in table at nmethod::oops_begin |
0 | 760 return code()->oop_addr_at(n); |
761 } | |
762 } | |
763 | |
764 | |
765 oop oop_Relocation::oop_value() { | |
766 oop v = *oop_addr(); | |
767 // clean inline caches store a special pseudo-null | |
768 if (v == (oop)Universe::non_oop_word()) v = NULL; | |
769 return v; | |
770 } | |
771 | |
772 | |
773 void oop_Relocation::fix_oop_relocation() { | |
774 if (!oop_is_immediate()) { | |
775 // get the oop from the pool, and re-insert it into the instruction: | |
776 set_value(value()); | |
777 } | |
778 } | |
779 | |
780 | |
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781 void oop_Relocation::verify_oop_relocation() { |
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782 if (!oop_is_immediate()) { |
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783 // get the oop from the pool, and re-insert it into the instruction: |
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784 verify_value(value()); |
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785 } |
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786 } |
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787 |
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788 // meta data versions |
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789 Metadata** metadata_Relocation::metadata_addr() { |
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790 int n = _metadata_index; |
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791 if (n == 0) { |
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792 // metadata is stored in the code stream |
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793 return (Metadata**) pd_address_in_code(); |
0 | 794 } else { |
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795 // metadata is stored in table at nmethod::metadatas_begin |
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796 return code()->metadata_addr_at(n); |
0 | 797 } |
798 } | |
799 | |
800 | |
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801 Metadata* metadata_Relocation::metadata_value() { |
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802 Metadata* v = *metadata_addr(); |
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803 // clean inline caches store a special pseudo-null |
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804 if (v == (Metadata*)Universe::non_oop_word()) v = NULL; |
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805 return v; |
0 | 806 } |
807 | |
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808 |
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809 void metadata_Relocation::fix_metadata_relocation() { |
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810 if (!metadata_is_immediate()) { |
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811 // get the metadata from the pool, and re-insert it into the instruction: |
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812 pd_fix_value(value()); |
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813 } |
0 | 814 } |
815 | |
816 | |
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817 void metadata_Relocation::verify_metadata_relocation() { |
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818 if (!metadata_is_immediate()) { |
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819 // get the metadata from the pool, and re-insert it into the instruction: |
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820 verify_value(value()); |
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821 } |
0 | 822 } |
823 | |
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824 address virtual_call_Relocation::cached_value() { |
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825 assert(_cached_value != NULL && _cached_value < addr(), "must precede ic_call"); |
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826 return _cached_value; |
0 | 827 } |
828 | |
829 | |
830 void virtual_call_Relocation::clear_inline_cache() { | |
831 // No stubs for ICs | |
832 // Clean IC | |
833 ResourceMark rm; | |
834 CompiledIC* icache = CompiledIC_at(this); | |
835 icache->set_to_clean(); | |
836 } | |
837 | |
838 | |
839 void opt_virtual_call_Relocation::clear_inline_cache() { | |
840 // No stubs for ICs | |
841 // Clean IC | |
842 ResourceMark rm; | |
843 CompiledIC* icache = CompiledIC_at(this); | |
844 icache->set_to_clean(); | |
845 } | |
846 | |
847 | |
848 address opt_virtual_call_Relocation::static_stub() { | |
849 // search for the static stub who points back to this static call | |
850 address static_call_addr = addr(); | |
851 RelocIterator iter(code()); | |
852 while (iter.next()) { | |
853 if (iter.type() == relocInfo::static_stub_type) { | |
854 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
855 return iter.addr(); | |
856 } | |
857 } | |
858 } | |
859 return NULL; | |
860 } | |
861 | |
862 | |
863 void static_call_Relocation::clear_inline_cache() { | |
864 // Safe call site info | |
865 CompiledStaticCall* handler = compiledStaticCall_at(this); | |
866 handler->set_to_clean(); | |
867 } | |
868 | |
869 | |
870 address static_call_Relocation::static_stub() { | |
871 // search for the static stub who points back to this static call | |
872 address static_call_addr = addr(); | |
873 RelocIterator iter(code()); | |
874 while (iter.next()) { | |
875 if (iter.type() == relocInfo::static_stub_type) { | |
876 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
877 return iter.addr(); | |
878 } | |
879 } | |
880 } | |
881 return NULL; | |
882 } | |
883 | |
884 | |
885 void static_stub_Relocation::clear_inline_cache() { | |
886 // Call stub is only used when calling the interpreted code. | |
887 // It does not really need to be cleared, except that we want to clean out the methodoop. | |
888 CompiledStaticCall::set_stub_to_clean(this); | |
889 } | |
890 | |
891 | |
892 void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
893 address target = _target; | |
894 if (target == NULL) { | |
895 // An absolute embedded reference to an external location, | |
896 // which means there is nothing to fix here. | |
897 return; | |
898 } | |
899 // Probably this reference is absolute, not relative, so the | |
900 // following is probably a no-op. | |
901 assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity"); | |
902 set_value(target); | |
903 } | |
904 | |
905 | |
906 address external_word_Relocation::target() { | |
907 address target = _target; | |
908 if (target == NULL) { | |
909 target = pd_get_address_from_code(); | |
910 } | |
911 return target; | |
912 } | |
913 | |
914 | |
915 void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
916 address target = _target; | |
917 if (target == NULL) { | |
918 if (addr_in_const()) { | |
919 target = new_addr_for(*(address*)addr(), src, dest); | |
920 } else { | |
921 target = new_addr_for(pd_get_address_from_code(), src, dest); | |
922 } | |
923 } | |
924 set_value(target); | |
925 } | |
926 | |
927 | |
928 address internal_word_Relocation::target() { | |
929 address target = _target; | |
930 if (target == NULL) { | |
931 target = pd_get_address_from_code(); | |
932 } | |
933 return target; | |
934 } | |
935 | |
936 | |
937 breakpoint_Relocation::breakpoint_Relocation(int kind, address target, bool internal) { | |
938 bool active = false; | |
939 bool enabled = (kind == initialization); | |
940 bool removable = (kind != safepoint); | |
941 bool settable = (target == NULL); | |
942 | |
943 int bits = kind; | |
944 if (enabled) bits |= enabled_state; | |
945 if (internal) bits |= internal_attr; | |
946 if (removable) bits |= removable_attr; | |
947 if (settable) bits |= settable_attr; | |
948 | |
949 _bits = bits | high_bit; | |
950 _target = target; | |
951 | |
952 assert(this->kind() == kind, "kind encoded"); | |
953 assert(this->enabled() == enabled, "enabled encoded"); | |
954 assert(this->active() == active, "active encoded"); | |
955 assert(this->internal() == internal, "internal encoded"); | |
956 assert(this->removable() == removable, "removable encoded"); | |
957 assert(this->settable() == settable, "settable encoded"); | |
958 } | |
959 | |
960 | |
961 address breakpoint_Relocation::target() const { | |
962 return _target; | |
963 } | |
964 | |
965 | |
966 void breakpoint_Relocation::set_target(address x) { | |
967 assert(settable(), "must be settable"); | |
968 jint target_bits = | |
969 (jint)(internal() ? scaled_offset (x, addr()) | |
970 : runtime_address_to_index(x)); | |
971 short* p = &live_bits() + 1; | |
972 p = add_jint(p, target_bits); | |
973 assert(p == instrs(), "new target must fit"); | |
974 _target = x; | |
975 } | |
976 | |
977 | |
978 void breakpoint_Relocation::set_enabled(bool b) { | |
979 if (enabled() == b) return; | |
980 | |
981 if (b) { | |
982 set_bits(bits() | enabled_state); | |
983 } else { | |
984 set_active(false); // remove the actual breakpoint insn, if any | |
985 set_bits(bits() & ~enabled_state); | |
986 } | |
987 } | |
988 | |
989 | |
990 void breakpoint_Relocation::set_active(bool b) { | |
991 assert(!b || enabled(), "cannot activate a disabled breakpoint"); | |
992 | |
993 if (active() == b) return; | |
994 | |
995 // %%% should probably seize a lock here (might not be the right lock) | |
996 //MutexLockerEx ml_patch(Patching_lock, true); | |
997 //if (active() == b) return; // recheck state after locking | |
998 | |
999 if (b) { | |
1000 set_bits(bits() | active_state); | |
1001 if (instrlen() == 0) | |
1002 fatal("breakpoints in original code must be undoable"); | |
1003 pd_swap_in_breakpoint (addr(), instrs(), instrlen()); | |
1004 } else { | |
1005 set_bits(bits() & ~active_state); | |
1006 pd_swap_out_breakpoint(addr(), instrs(), instrlen()); | |
1007 } | |
1008 } | |
1009 | |
1010 | |
1011 //--------------------------------------------------------------------------------- | |
1012 // Non-product code | |
1013 | |
1014 #ifndef PRODUCT | |
1015 | |
1016 static const char* reloc_type_string(relocInfo::relocType t) { | |
1017 switch (t) { | |
1018 #define EACH_CASE(name) \ | |
1019 case relocInfo::name##_type: \ | |
1020 return #name; | |
1021 | |
1022 APPLY_TO_RELOCATIONS(EACH_CASE); | |
1023 #undef EACH_CASE | |
1024 | |
1025 case relocInfo::none: | |
1026 return "none"; | |
1027 case relocInfo::data_prefix_tag: | |
1028 return "prefix"; | |
1029 default: | |
1030 return "UNKNOWN RELOC TYPE"; | |
1031 } | |
1032 } | |
1033 | |
1034 | |
1035 void RelocIterator::print_current() { | |
1036 if (!has_current()) { | |
1037 tty->print_cr("(no relocs)"); | |
1038 return; | |
1039 } | |
2002 | 1040 tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT " offset=%d", |
1041 _current, type(), reloc_type_string((relocInfo::relocType) type()), _addr, _current->addr_offset()); | |
0 | 1042 if (current()->format() != 0) |
1043 tty->print(" format=%d", current()->format()); | |
1044 if (datalen() == 1) { | |
1045 tty->print(" data=%d", data()[0]); | |
1046 } else if (datalen() > 0) { | |
1047 tty->print(" data={"); | |
1048 for (int i = 0; i < datalen(); i++) { | |
1049 tty->print("%04x", data()[i] & 0xFFFF); | |
1050 } | |
1051 tty->print("}"); | |
1052 } | |
1053 tty->print("]"); | |
1054 switch (type()) { | |
1055 case relocInfo::oop_type: | |
1056 { | |
1057 oop_Relocation* r = oop_reloc(); | |
1058 oop* oop_addr = NULL; | |
1059 oop raw_oop = NULL; | |
1060 oop oop_value = NULL; | |
1061 if (code() != NULL || r->oop_is_immediate()) { | |
1062 oop_addr = r->oop_addr(); | |
1063 raw_oop = *oop_addr; | |
1064 oop_value = r->oop_value(); | |
1065 } | |
1066 tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", | |
1067 oop_addr, (address)raw_oop, r->offset()); | |
1068 // Do not print the oop by default--we want this routine to | |
1069 // work even during GC or other inconvenient times. | |
1070 if (WizardMode && oop_value != NULL) { | |
1071 tty->print("oop_value=" INTPTR_FORMAT ": ", (address)oop_value); | |
1072 oop_value->print_value_on(tty); | |
1073 } | |
1074 break; | |
1075 } | |
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1076 case relocInfo::metadata_type: |
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1077 { |
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1078 metadata_Relocation* r = metadata_reloc(); |
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1079 Metadata** metadata_addr = NULL; |
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1080 Metadata* raw_metadata = NULL; |
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1081 Metadata* metadata_value = NULL; |
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1082 if (code() != NULL || r->metadata_is_immediate()) { |
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1083 metadata_addr = r->metadata_addr(); |
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1084 raw_metadata = *metadata_addr; |
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1085 metadata_value = r->metadata_value(); |
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1086 } |
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1087 tty->print(" | [metadata_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", |
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1088 metadata_addr, (address)raw_metadata, r->offset()); |
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1089 if (metadata_value != NULL) { |
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1090 tty->print("metadata_value=" INTPTR_FORMAT ": ", (address)metadata_value); |
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1091 metadata_value->print_value_on(tty); |
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1092 } |
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1093 break; |
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1094 } |
0 | 1095 case relocInfo::external_word_type: |
1096 case relocInfo::internal_word_type: | |
1097 case relocInfo::section_word_type: | |
1098 { | |
1099 DataRelocation* r = (DataRelocation*) reloc(); | |
1100 tty->print(" | [target=" INTPTR_FORMAT "]", r->value()); //value==target | |
1101 break; | |
1102 } | |
1103 case relocInfo::static_call_type: | |
1104 case relocInfo::runtime_call_type: | |
1105 { | |
1106 CallRelocation* r = (CallRelocation*) reloc(); | |
1107 tty->print(" | [destination=" INTPTR_FORMAT "]", r->destination()); | |
1108 break; | |
1109 } | |
1110 case relocInfo::virtual_call_type: | |
1111 { | |
1112 virtual_call_Relocation* r = (virtual_call_Relocation*) reloc(); | |
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1113 tty->print(" | [destination=" INTPTR_FORMAT " cached_value=" INTPTR_FORMAT "]", |
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1114 r->destination(), r->cached_value()); |
0 | 1115 break; |
1116 } | |
1117 case relocInfo::static_stub_type: | |
1118 { | |
1119 static_stub_Relocation* r = (static_stub_Relocation*) reloc(); | |
1120 tty->print(" | [static_call=" INTPTR_FORMAT "]", r->static_call()); | |
1121 break; | |
1122 } | |
1123 } | |
1124 tty->cr(); | |
1125 } | |
1126 | |
1127 | |
1128 void RelocIterator::print() { | |
1129 RelocIterator save_this = (*this); | |
1130 relocInfo* scan = _current; | |
1131 if (!has_current()) scan += 1; // nothing to scan here! | |
1132 | |
1133 bool skip_next = has_current(); | |
1134 bool got_next; | |
1135 while (true) { | |
1136 got_next = (skip_next || next()); | |
1137 skip_next = false; | |
1138 | |
1139 tty->print(" @" INTPTR_FORMAT ": ", scan); | |
1140 relocInfo* newscan = _current+1; | |
1141 if (!has_current()) newscan -= 1; // nothing to scan here! | |
1142 while (scan < newscan) { | |
1143 tty->print("%04x", *(short*)scan & 0xFFFF); | |
1144 scan++; | |
1145 } | |
1146 tty->cr(); | |
1147 | |
1148 if (!got_next) break; | |
1149 print_current(); | |
1150 } | |
1151 | |
1152 (*this) = save_this; | |
1153 } | |
1154 | |
1155 // For the debugger: | |
1156 extern "C" | |
1563
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1157 void print_blob_locs(nmethod* nm) { |
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1158 nm->print(); |
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1159 RelocIterator iter(nm); |
0 | 1160 iter.print(); |
1161 } | |
1162 extern "C" | |
1163 void print_buf_locs(CodeBuffer* cb) { | |
1164 FlagSetting fs(PrintRelocations, true); | |
1165 cb->print(); | |
1166 } | |
1167 #endif // !PRODUCT |