Mercurial > hg > truffle
annotate src/share/vm/code/relocInfo.cpp @ 20261:27188ae8bbbb
8035648: Don't use Handle in java_lang_String::print
Reviewed-by: coleenp, pliden
author | stefank |
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date | Thu, 27 Feb 2014 10:34:55 +0100 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 33acb0c42664 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 |
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
0 | 35 |
36 const RelocationHolder RelocationHolder::none; // its type is relocInfo::none | |
37 | |
38 | |
39 // Implementation of relocInfo | |
40 | |
41 #ifdef ASSERT | |
42 relocInfo::relocInfo(relocType t, int off, int f) { | |
43 assert(t != data_prefix_tag, "cannot build a prefix this way"); | |
44 assert((t & type_mask) == t, "wrong type"); | |
45 assert((f & format_mask) == f, "wrong format"); | |
46 assert(off >= 0 && off < offset_limit(), "offset out off bounds"); | |
47 assert((off & (offset_unit-1)) == 0, "misaligned offset"); | |
48 (*this) = relocInfo(t, RAW_BITS, off, f); | |
49 } | |
50 #endif | |
51 | |
52 void relocInfo::initialize(CodeSection* dest, Relocation* reloc) { | |
53 relocInfo* data = this+1; // here's where the data might go | |
54 dest->set_locs_end(data); // sync end: the next call may read dest.locs_end | |
55 reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end | |
56 relocInfo* data_limit = dest->locs_end(); | |
57 if (data_limit > data) { | |
58 relocInfo suffix = (*this); | |
59 data_limit = this->finish_prefix((short*) data_limit); | |
60 // Finish up with the suffix. (Hack note: pack_data_to might edit this.) | |
61 *data_limit = suffix; | |
62 dest->set_locs_end(data_limit+1); | |
63 } | |
64 } | |
65 | |
66 relocInfo* relocInfo::finish_prefix(short* prefix_limit) { | |
67 assert(sizeof(relocInfo) == sizeof(short), "change this code"); | |
68 short* p = (short*)(this+1); | |
69 assert(prefix_limit >= p, "must be a valid span of data"); | |
70 int plen = prefix_limit - p; | |
71 if (plen == 0) { | |
72 debug_only(_value = 0xFFFF); | |
73 return this; // no data: remove self completely | |
74 } | |
75 if (plen == 1 && fits_into_immediate(p[0])) { | |
76 (*this) = immediate_relocInfo(p[0]); // move data inside self | |
77 return this+1; | |
78 } | |
79 // cannot compact, so just update the count and return the limit pointer | |
80 (*this) = prefix_relocInfo(plen); // write new datalen | |
81 assert(data() + datalen() == prefix_limit, "pointers must line up"); | |
82 return (relocInfo*)prefix_limit; | |
83 } | |
84 | |
85 | |
86 void relocInfo::set_type(relocType t) { | |
87 int old_offset = addr_offset(); | |
88 int old_format = format(); | |
89 (*this) = relocInfo(t, old_offset, old_format); | |
90 assert(type()==(int)t, "sanity check"); | |
91 assert(addr_offset()==old_offset, "sanity check"); | |
92 assert(format()==old_format, "sanity check"); | |
93 } | |
94 | |
95 | |
96 void relocInfo::set_format(int f) { | |
97 int old_offset = addr_offset(); | |
98 assert((f & format_mask) == f, "wrong format"); | |
99 _value = (_value & ~(format_mask << offset_width)) | (f << offset_width); | |
100 assert(addr_offset()==old_offset, "sanity check"); | |
101 } | |
102 | |
103 | |
104 void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) { | |
105 bool found = false; | |
106 while (itr->next() && !found) { | |
107 if (itr->addr() == pc) { | |
108 assert(itr->type()==old_type, "wrong relocInfo type found"); | |
109 itr->current()->set_type(new_type); | |
110 found=true; | |
111 } | |
112 } | |
113 assert(found, "no relocInfo found for pc"); | |
114 } | |
115 | |
116 | |
117 void relocInfo::remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type) { | |
118 change_reloc_info_for_address(itr, pc, old_type, none); | |
119 } | |
120 | |
121 | |
122 // ---------------------------------------------------------------------------------------------------- | |
123 // Implementation of RelocIterator | |
124 | |
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125 void RelocIterator::initialize(nmethod* nm, address begin, address limit) { |
0 | 126 initialize_misc(); |
127 | |
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128 if (nm == NULL && begin != NULL) { |
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129 // allow nmethod to be deduced from beginning address |
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130 CodeBlob* cb = CodeCache::find_blob(begin); |
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131 nm = cb->as_nmethod_or_null(); |
0 | 132 } |
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133 assert(nm != NULL, "must be able to deduce nmethod from other arguments"); |
0 | 134 |
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135 _code = nm; |
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136 _current = nm->relocation_begin() - 1; |
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137 _end = nm->relocation_end(); |
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138 _addr = nm->content_begin(); |
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139 |
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140 // Initialize code sections. |
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141 _section_start[CodeBuffer::SECT_CONSTS] = nm->consts_begin(); |
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142 _section_start[CodeBuffer::SECT_INSTS ] = nm->insts_begin() ; |
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143 _section_start[CodeBuffer::SECT_STUBS ] = nm->stub_begin() ; |
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144 |
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145 _section_end [CodeBuffer::SECT_CONSTS] = nm->consts_end() ; |
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146 _section_end [CodeBuffer::SECT_INSTS ] = nm->insts_end() ; |
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147 _section_end [CodeBuffer::SECT_STUBS ] = nm->stub_end() ; |
0 | 148 |
149 assert(!has_current(), "just checking"); | |
1748 | 150 assert(begin == NULL || begin >= nm->code_begin(), "in bounds"); |
151 assert(limit == NULL || limit <= nm->code_end(), "in bounds"); | |
0 | 152 set_limits(begin, limit); |
153 } | |
154 | |
155 | |
156 RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) { | |
157 initialize_misc(); | |
158 | |
159 _current = cs->locs_start()-1; | |
160 _end = cs->locs_end(); | |
161 _addr = cs->start(); | |
162 _code = NULL; // Not cb->blob(); | |
163 | |
164 CodeBuffer* cb = cs->outer(); | |
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165 assert((int) SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal"); |
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166 for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) { |
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167 CodeSection* cs = cb->code_section(n); |
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168 _section_start[n] = cs->start(); |
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169 _section_end [n] = cs->end(); |
0 | 170 } |
171 | |
172 assert(!has_current(), "just checking"); | |
173 | |
174 assert(begin == NULL || begin >= cs->start(), "in bounds"); | |
175 assert(limit == NULL || limit <= cs->end(), "in bounds"); | |
176 set_limits(begin, limit); | |
177 } | |
178 | |
179 | |
180 enum { indexCardSize = 128 }; | |
181 struct RelocIndexEntry { | |
182 jint addr_offset; // offset from header_end of an addr() | |
183 jint reloc_offset; // offset from header_end of a relocInfo (prefix) | |
184 }; | |
185 | |
186 | |
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187 bool RelocIterator::addr_in_const() const { |
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188 const int n = CodeBuffer::SECT_CONSTS; |
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189 return section_start(n) <= addr() && addr() < section_end(n); |
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190 } |
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191 |
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192 |
0 | 193 static inline int num_cards(int code_size) { |
194 return (code_size-1) / indexCardSize; | |
195 } | |
196 | |
197 | |
198 int RelocIterator::locs_and_index_size(int code_size, int locs_size) { | |
199 if (!UseRelocIndex) return locs_size; // no index | |
200 code_size = round_to(code_size, oopSize); | |
201 locs_size = round_to(locs_size, oopSize); | |
202 int index_size = num_cards(code_size) * sizeof(RelocIndexEntry); | |
203 // format of indexed relocs: | |
204 // relocation_begin: relocInfo ... | |
205 // index: (addr,reloc#) ... | |
206 // indexSize :relocation_end | |
207 return locs_size + index_size + BytesPerInt; | |
208 } | |
209 | |
210 | |
211 void RelocIterator::create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end) { | |
212 address relocation_begin = (address)dest_begin; | |
213 address relocation_end = (address)dest_end; | |
214 int total_size = relocation_end - relocation_begin; | |
215 int locs_size = dest_count * sizeof(relocInfo); | |
216 if (!UseRelocIndex) { | |
217 Copy::fill_to_bytes(relocation_begin + locs_size, total_size-locs_size, 0); | |
218 return; | |
219 } | |
220 int index_size = total_size - locs_size - BytesPerInt; // find out how much space is left | |
221 int ncards = index_size / sizeof(RelocIndexEntry); | |
222 assert(total_size == locs_size + index_size + BytesPerInt, "checkin'"); | |
223 assert(index_size >= 0 && index_size % sizeof(RelocIndexEntry) == 0, "checkin'"); | |
224 jint* index_size_addr = (jint*)relocation_end - 1; | |
225 | |
226 assert(sizeof(jint) == BytesPerInt, "change this code"); | |
227 | |
228 *index_size_addr = index_size; | |
229 if (index_size != 0) { | |
230 assert(index_size > 0, "checkin'"); | |
231 | |
232 RelocIndexEntry* index = (RelocIndexEntry *)(relocation_begin + locs_size); | |
233 assert(index == (RelocIndexEntry*)index_size_addr - ncards, "checkin'"); | |
234 | |
235 // walk over the relocations, and fill in index entries as we go | |
236 RelocIterator iter; | |
237 const address initial_addr = NULL; | |
238 relocInfo* const initial_current = dest_begin - 1; // biased by -1 like elsewhere | |
239 | |
240 iter._code = NULL; | |
241 iter._addr = initial_addr; | |
242 iter._limit = (address)(intptr_t)(ncards * indexCardSize); | |
243 iter._current = initial_current; | |
244 iter._end = dest_begin + dest_count; | |
245 | |
246 int i = 0; | |
247 address next_card_addr = (address)indexCardSize; | |
248 int addr_offset = 0; | |
249 int reloc_offset = 0; | |
250 while (true) { | |
251 // Checkpoint the iterator before advancing it. | |
252 addr_offset = iter._addr - initial_addr; | |
253 reloc_offset = iter._current - initial_current; | |
254 if (!iter.next()) break; | |
255 while (iter.addr() >= next_card_addr) { | |
256 index[i].addr_offset = addr_offset; | |
257 index[i].reloc_offset = reloc_offset; | |
258 i++; | |
259 next_card_addr += indexCardSize; | |
260 } | |
261 } | |
262 while (i < ncards) { | |
263 index[i].addr_offset = addr_offset; | |
264 index[i].reloc_offset = reloc_offset; | |
265 i++; | |
266 } | |
267 } | |
268 } | |
269 | |
270 | |
271 void RelocIterator::set_limits(address begin, address limit) { | |
272 int index_size = 0; | |
273 if (UseRelocIndex && _code != NULL) { | |
274 index_size = ((jint*)_end)[-1]; | |
275 _end = (relocInfo*)( (address)_end - index_size - BytesPerInt ); | |
276 } | |
277 | |
278 _limit = limit; | |
279 | |
280 // the limit affects this next stuff: | |
281 if (begin != NULL) { | |
282 #ifdef ASSERT | |
283 // In ASSERT mode we do not actually use the index, but simply | |
284 // check that its contents would have led us to the right answer. | |
285 address addrCheck = _addr; | |
286 relocInfo* infoCheck = _current; | |
287 #endif // ASSERT | |
288 if (index_size > 0) { | |
289 // skip ahead | |
290 RelocIndexEntry* index = (RelocIndexEntry*)_end; | |
291 RelocIndexEntry* index_limit = (RelocIndexEntry*)((address)index + index_size); | |
1748 | 292 assert(_addr == _code->code_begin(), "_addr must be unadjusted"); |
0 | 293 int card = (begin - _addr) / indexCardSize; |
294 if (card > 0) { | |
295 if (index+card-1 < index_limit) index += card-1; | |
296 else index = index_limit - 1; | |
297 #ifdef ASSERT | |
298 addrCheck = _addr + index->addr_offset; | |
299 infoCheck = _current + index->reloc_offset; | |
300 #else | |
301 // Advance the iterator immediately to the last valid state | |
302 // for the previous card. Calling "next" will then advance | |
303 // it to the first item on the required card. | |
304 _addr += index->addr_offset; | |
305 _current += index->reloc_offset; | |
306 #endif // ASSERT | |
307 } | |
308 } | |
309 | |
310 relocInfo* backup; | |
311 address backup_addr; | |
312 while (true) { | |
313 backup = _current; | |
314 backup_addr = _addr; | |
315 #ifdef ASSERT | |
316 if (backup == infoCheck) { | |
317 assert(backup_addr == addrCheck, "must match"); addrCheck = NULL; infoCheck = NULL; | |
318 } else { | |
319 assert(addrCheck == NULL || backup_addr <= addrCheck, "must not pass addrCheck"); | |
320 } | |
321 #endif // ASSERT | |
322 if (!next() || addr() >= begin) break; | |
323 } | |
324 assert(addrCheck == NULL || addrCheck == backup_addr, "must have matched addrCheck"); | |
325 assert(infoCheck == NULL || infoCheck == backup, "must have matched infoCheck"); | |
326 // At this point, either we are at the first matching record, | |
327 // or else there is no such record, and !has_current(). | |
328 // In either case, revert to the immediatly preceding state. | |
329 _current = backup; | |
330 _addr = backup_addr; | |
331 set_has_current(false); | |
332 } | |
333 } | |
334 | |
335 | |
336 void RelocIterator::set_limit(address limit) { | |
337 address code_end = (address)code() + code()->size(); | |
338 assert(limit == NULL || limit <= code_end, "in bounds"); | |
339 _limit = limit; | |
340 } | |
341 | |
342 // All the strange bit-encodings are in here. | |
343 // The idea is to encode relocation data which are small integers | |
344 // very efficiently (a single extra halfword). Larger chunks of | |
345 // relocation data need a halfword header to hold their size. | |
346 void RelocIterator::advance_over_prefix() { | |
347 if (_current->is_datalen()) { | |
348 _data = (short*) _current->data(); | |
349 _datalen = _current->datalen(); | |
350 _current += _datalen + 1; // skip the embedded data & header | |
351 } else { | |
352 _databuf = _current->immediate(); | |
353 _data = &_databuf; | |
354 _datalen = 1; | |
355 _current++; // skip the header | |
356 } | |
357 // The client will see the following relocInfo, whatever that is. | |
358 // It is the reloc to which the preceding data applies. | |
359 } | |
360 | |
361 | |
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362 void RelocIterator::initialize_misc() { |
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363 set_has_current(false); |
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364 for (int i = (int) CodeBuffer::SECT_FIRST; i < (int) CodeBuffer::SECT_LIMIT; i++) { |
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365 _section_start[i] = NULL; // these will be lazily computed, if needed |
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366 _section_end [i] = NULL; |
0 | 367 } |
368 } | |
369 | |
370 | |
371 Relocation* RelocIterator::reloc() { | |
372 // (take the "switch" out-of-line) | |
373 relocInfo::relocType t = type(); | |
374 if (false) {} | |
375 #define EACH_TYPE(name) \ | |
376 else if (t == relocInfo::name##_type) { \ | |
377 return name##_reloc(); \ | |
378 } | |
379 APPLY_TO_RELOCATIONS(EACH_TYPE); | |
380 #undef EACH_TYPE | |
381 assert(t == relocInfo::none, "must be padding"); | |
382 return new(_rh) Relocation(); | |
383 } | |
384 | |
385 | |
386 //////// Methods for flyweight Relocation types | |
387 | |
388 | |
389 RelocationHolder RelocationHolder::plus(int offset) const { | |
390 if (offset != 0) { | |
391 switch (type()) { | |
392 case relocInfo::none: | |
393 break; | |
394 case relocInfo::oop_type: | |
395 { | |
396 oop_Relocation* r = (oop_Relocation*)reloc(); | |
397 return oop_Relocation::spec(r->oop_index(), r->offset() + offset); | |
398 } | |
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399 case relocInfo::metadata_type: |
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400 { |
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401 metadata_Relocation* r = (metadata_Relocation*)reloc(); |
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402 return metadata_Relocation::spec(r->metadata_index(), r->offset() + offset); |
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403 } |
0 | 404 default: |
405 ShouldNotReachHere(); | |
406 } | |
407 } | |
408 return (*this); | |
409 } | |
410 | |
411 | |
412 void Relocation::guarantee_size() { | |
413 guarantee(false, "Make _relocbuf bigger!"); | |
414 } | |
415 | |
416 // some relocations can compute their own values | |
417 address Relocation::value() { | |
418 ShouldNotReachHere(); | |
419 return NULL; | |
420 } | |
421 | |
422 | |
423 void Relocation::set_value(address x) { | |
424 ShouldNotReachHere(); | |
425 } | |
426 | |
427 | |
428 RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) { | |
429 if (rtype == relocInfo::none) return RelocationHolder::none; | |
430 relocInfo ri = relocInfo(rtype, 0); | |
431 RelocIterator itr; | |
432 itr.set_current(ri); | |
433 itr.reloc(); | |
434 return itr._rh; | |
435 } | |
436 | |
437 int32_t Relocation::runtime_address_to_index(address runtime_address) { | |
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438 assert(!is_reloc_index((intptr_t)runtime_address), "must not look like an index"); |
0 | 439 |
440 if (runtime_address == NULL) return 0; | |
441 | |
442 StubCodeDesc* p = StubCodeDesc::desc_for(runtime_address); | |
443 if (p != NULL && p->begin() == runtime_address) { | |
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444 assert(is_reloc_index(p->index()), "there must not be too many stubs"); |
0 | 445 return (int32_t)p->index(); |
446 } else { | |
447 // Known "miscellaneous" non-stub pointers: | |
448 // os::get_polling_page(), SafepointSynchronize::address_of_state() | |
449 if (PrintRelocations) { | |
450 tty->print_cr("random unregistered address in relocInfo: " INTPTR_FORMAT, runtime_address); | |
451 } | |
452 #ifndef _LP64 | |
453 return (int32_t) (intptr_t)runtime_address; | |
454 #else | |
455 // didn't fit return non-index | |
456 return -1; | |
457 #endif /* _LP64 */ | |
458 } | |
459 } | |
460 | |
461 | |
462 address Relocation::index_to_runtime_address(int32_t index) { | |
463 if (index == 0) return NULL; | |
464 | |
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465 if (is_reloc_index(index)) { |
0 | 466 StubCodeDesc* p = StubCodeDesc::desc_for_index(index); |
467 assert(p != NULL, "there must be a stub for this index"); | |
468 return p->begin(); | |
469 } else { | |
470 #ifndef _LP64 | |
471 // this only works on 32bit machines | |
472 return (address) ((intptr_t) index); | |
473 #else | |
474 fatal("Relocation::index_to_runtime_address, int32_t not pointer sized"); | |
475 return NULL; | |
476 #endif /* _LP64 */ | |
477 } | |
478 } | |
479 | |
480 address Relocation::old_addr_for(address newa, | |
481 const CodeBuffer* src, CodeBuffer* dest) { | |
482 int sect = dest->section_index_of(newa); | |
483 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
484 address ostart = src->code_section(sect)->start(); | |
485 address nstart = dest->code_section(sect)->start(); | |
486 return ostart + (newa - nstart); | |
487 } | |
488 | |
489 address Relocation::new_addr_for(address olda, | |
490 const CodeBuffer* src, CodeBuffer* dest) { | |
491 debug_only(const CodeBuffer* src0 = src); | |
492 int sect = CodeBuffer::SECT_NONE; | |
493 // Look for olda in the source buffer, and all previous incarnations | |
494 // if the source buffer has been expanded. | |
495 for (; src != NULL; src = src->before_expand()) { | |
496 sect = src->section_index_of(olda); | |
497 if (sect != CodeBuffer::SECT_NONE) break; | |
498 } | |
499 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); | |
500 address ostart = src->code_section(sect)->start(); | |
501 address nstart = dest->code_section(sect)->start(); | |
502 return nstart + (olda - ostart); | |
503 } | |
504 | |
505 void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) { | |
506 address addr0 = addr; | |
507 if (addr0 == NULL || dest->allocates2(addr0)) return; | |
508 CodeBuffer* cb = dest->outer(); | |
509 addr = new_addr_for(addr0, cb, cb); | |
510 assert(allow_other_sections || dest->contains2(addr), | |
511 "addr must be in required section"); | |
512 } | |
513 | |
514 | |
515 void CallRelocation::set_destination(address x) { | |
516 pd_set_call_destination(x); | |
517 } | |
518 | |
519 void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
520 // Usually a self-relative reference to an external routine. | |
521 // On some platforms, the reference is absolute (not self-relative). | |
522 // The enhanced use of pd_call_destination sorts this all out. | |
523 address orig_addr = old_addr_for(addr(), src, dest); | |
524 address callee = pd_call_destination(orig_addr); | |
525 // Reassert the callee address, this time in the new copy of the code. | |
526 pd_set_call_destination(callee); | |
527 } | |
528 | |
529 | |
530 //// pack/unpack methods | |
531 | |
532 void oop_Relocation::pack_data_to(CodeSection* dest) { | |
533 short* p = (short*) dest->locs_end(); | |
534 p = pack_2_ints_to(p, _oop_index, _offset); | |
535 dest->set_locs_end((relocInfo*) p); | |
536 } | |
537 | |
538 | |
539 void oop_Relocation::unpack_data() { | |
540 unpack_2_ints(_oop_index, _offset); | |
541 } | |
542 | |
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543 void metadata_Relocation::pack_data_to(CodeSection* dest) { |
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544 short* p = (short*) dest->locs_end(); |
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545 p = pack_2_ints_to(p, _metadata_index, _offset); |
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546 dest->set_locs_end((relocInfo*) p); |
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547 } |
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548 |
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549 |
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550 void metadata_Relocation::unpack_data() { |
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551 unpack_2_ints(_metadata_index, _offset); |
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552 } |
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553 |
0 | 554 |
555 void virtual_call_Relocation::pack_data_to(CodeSection* dest) { | |
556 short* p = (short*) dest->locs_end(); | |
557 address point = dest->locs_point(); | |
558 | |
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559 normalize_address(_cached_value, dest); |
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560 jint x0 = scaled_offset_null_special(_cached_value, point); |
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561 p = pack_1_int_to(p, x0); |
0 | 562 dest->set_locs_end((relocInfo*) p); |
563 } | |
564 | |
565 | |
566 void virtual_call_Relocation::unpack_data() { | |
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567 jint x0 = unpack_1_int(); |
0 | 568 address point = addr(); |
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569 _cached_value = x0==0? NULL: address_from_scaled_offset(x0, point); |
0 | 570 } |
571 | |
572 | |
573 void static_stub_Relocation::pack_data_to(CodeSection* dest) { | |
574 short* p = (short*) dest->locs_end(); | |
575 CodeSection* insts = dest->outer()->insts(); | |
576 normalize_address(_static_call, insts); | |
577 p = pack_1_int_to(p, scaled_offset(_static_call, insts->start())); | |
578 dest->set_locs_end((relocInfo*) p); | |
579 } | |
580 | |
581 void static_stub_Relocation::unpack_data() { | |
582 address base = binding()->section_start(CodeBuffer::SECT_INSTS); | |
583 _static_call = address_from_scaled_offset(unpack_1_int(), base); | |
584 } | |
585 | |
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586 void trampoline_stub_Relocation::pack_data_to(CodeSection* dest ) { |
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587 short* p = (short*) dest->locs_end(); |
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588 CodeSection* insts = dest->outer()->insts(); |
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589 normalize_address(_owner, insts); |
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590 p = pack_1_int_to(p, scaled_offset(_owner, insts->start())); |
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591 dest->set_locs_end((relocInfo*) p); |
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592 } |
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593 |
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594 void trampoline_stub_Relocation::unpack_data() { |
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595 address base = binding()->section_start(CodeBuffer::SECT_INSTS); |
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596 _owner = address_from_scaled_offset(unpack_1_int(), base); |
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597 } |
0 | 598 |
599 void external_word_Relocation::pack_data_to(CodeSection* dest) { | |
600 short* p = (short*) dest->locs_end(); | |
601 int32_t index = runtime_address_to_index(_target); | |
602 #ifndef _LP64 | |
603 p = pack_1_int_to(p, index); | |
604 #else | |
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605 if (is_reloc_index(index)) { |
0 | 606 p = pack_2_ints_to(p, index, 0); |
607 } else { | |
608 jlong t = (jlong) _target; | |
609 int32_t lo = low(t); | |
610 int32_t hi = high(t); | |
611 p = pack_2_ints_to(p, lo, hi); | |
612 DEBUG_ONLY(jlong t1 = jlong_from(hi, lo)); | |
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613 assert(!is_reloc_index(t1) && (address) t1 == _target, "not symmetric"); |
0 | 614 } |
615 #endif /* _LP64 */ | |
616 dest->set_locs_end((relocInfo*) p); | |
617 } | |
618 | |
619 | |
620 void external_word_Relocation::unpack_data() { | |
621 #ifndef _LP64 | |
622 _target = index_to_runtime_address(unpack_1_int()); | |
623 #else | |
624 int32_t lo, hi; | |
625 unpack_2_ints(lo, hi); | |
626 jlong t = jlong_from(hi, lo);; | |
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627 if (is_reloc_index(t)) { |
0 | 628 _target = index_to_runtime_address(t); |
629 } else { | |
630 _target = (address) t; | |
631 } | |
632 #endif /* _LP64 */ | |
633 } | |
634 | |
635 | |
636 void internal_word_Relocation::pack_data_to(CodeSection* dest) { | |
637 short* p = (short*) dest->locs_end(); | |
638 normalize_address(_target, dest, true); | |
639 | |
640 // Check whether my target address is valid within this section. | |
641 // If not, strengthen the relocation type to point to another section. | |
642 int sindex = _section; | |
643 if (sindex == CodeBuffer::SECT_NONE && _target != NULL | |
644 && (!dest->allocates(_target) || _target == dest->locs_point())) { | |
645 sindex = dest->outer()->section_index_of(_target); | |
646 guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere"); | |
647 relocInfo* base = dest->locs_end() - 1; | |
648 assert(base->type() == this->type(), "sanity"); | |
649 // Change the written type, to be section_word_type instead. | |
650 base->set_type(relocInfo::section_word_type); | |
651 } | |
652 | |
653 // Note: An internal_word relocation cannot refer to its own instruction, | |
654 // because we reserve "0" to mean that the pointer itself is embedded | |
655 // in the code stream. We use a section_word relocation for such cases. | |
656 | |
657 if (sindex == CodeBuffer::SECT_NONE) { | |
658 assert(type() == relocInfo::internal_word_type, "must be base class"); | |
659 guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section"); | |
660 jint x0 = scaled_offset_null_special(_target, dest->locs_point()); | |
661 assert(!(x0 == 0 && _target != NULL), "correct encoding of null target"); | |
662 p = pack_1_int_to(p, x0); | |
663 } else { | |
664 assert(_target != NULL, "sanity"); | |
665 CodeSection* sect = dest->outer()->code_section(sindex); | |
666 guarantee(sect->allocates2(_target), "must be in correct section"); | |
667 address base = sect->start(); | |
668 jint offset = scaled_offset(_target, base); | |
669 assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity"); | |
670 assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++"); | |
671 p = pack_1_int_to(p, (offset << section_width) | sindex); | |
672 } | |
673 | |
674 dest->set_locs_end((relocInfo*) p); | |
675 } | |
676 | |
677 | |
678 void internal_word_Relocation::unpack_data() { | |
679 jint x0 = unpack_1_int(); | |
680 _target = x0==0? NULL: address_from_scaled_offset(x0, addr()); | |
681 _section = CodeBuffer::SECT_NONE; | |
682 } | |
683 | |
684 | |
685 void section_word_Relocation::unpack_data() { | |
686 jint x = unpack_1_int(); | |
687 jint offset = (x >> section_width); | |
688 int sindex = (x & ((1<<section_width)-1)); | |
689 address base = binding()->section_start(sindex); | |
690 | |
691 _section = sindex; | |
692 _target = address_from_scaled_offset(offset, base); | |
693 } | |
694 | |
695 //// miscellaneous methods | |
696 oop* oop_Relocation::oop_addr() { | |
697 int n = _oop_index; | |
698 if (n == 0) { | |
699 // oop is stored in the code stream | |
700 return (oop*) pd_address_in_code(); | |
701 } else { | |
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702 // oop is stored in table at nmethod::oops_begin |
0 | 703 return code()->oop_addr_at(n); |
704 } | |
705 } | |
706 | |
707 | |
708 oop oop_Relocation::oop_value() { | |
709 oop v = *oop_addr(); | |
710 // clean inline caches store a special pseudo-null | |
711 if (v == (oop)Universe::non_oop_word()) v = NULL; | |
712 return v; | |
713 } | |
714 | |
715 | |
716 void oop_Relocation::fix_oop_relocation() { | |
717 if (!oop_is_immediate()) { | |
718 // get the oop from the pool, and re-insert it into the instruction: | |
719 set_value(value()); | |
720 } | |
721 } | |
722 | |
723 | |
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724 void oop_Relocation::verify_oop_relocation() { |
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725 if (!oop_is_immediate()) { |
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726 // get the oop from the pool, and re-insert it into the instruction: |
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727 verify_value(value()); |
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728 } |
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729 } |
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730 |
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731 // meta data versions |
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732 Metadata** metadata_Relocation::metadata_addr() { |
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733 int n = _metadata_index; |
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734 if (n == 0) { |
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735 // metadata is stored in the code stream |
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736 return (Metadata**) pd_address_in_code(); |
0 | 737 } else { |
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738 // metadata is stored in table at nmethod::metadatas_begin |
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739 return code()->metadata_addr_at(n); |
0 | 740 } |
741 } | |
742 | |
743 | |
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744 Metadata* metadata_Relocation::metadata_value() { |
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745 Metadata* v = *metadata_addr(); |
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746 // clean inline caches store a special pseudo-null |
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747 if (v == (Metadata*)Universe::non_oop_word()) v = NULL; |
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748 return v; |
0 | 749 } |
750 | |
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751 |
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752 void metadata_Relocation::fix_metadata_relocation() { |
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753 if (!metadata_is_immediate()) { |
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754 // get the metadata from the pool, and re-insert it into the instruction: |
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755 pd_fix_value(value()); |
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756 } |
0 | 757 } |
758 | |
759 | |
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760 void metadata_Relocation::verify_metadata_relocation() { |
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761 if (!metadata_is_immediate()) { |
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762 // get the metadata from the pool, and re-insert it into the instruction: |
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763 verify_value(value()); |
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764 } |
0 | 765 } |
766 | |
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767 address virtual_call_Relocation::cached_value() { |
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768 assert(_cached_value != NULL && _cached_value < addr(), "must precede ic_call"); |
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769 return _cached_value; |
0 | 770 } |
771 | |
772 | |
773 void virtual_call_Relocation::clear_inline_cache() { | |
774 // No stubs for ICs | |
775 // Clean IC | |
776 ResourceMark rm; | |
777 CompiledIC* icache = CompiledIC_at(this); | |
778 icache->set_to_clean(); | |
779 } | |
780 | |
781 | |
782 void opt_virtual_call_Relocation::clear_inline_cache() { | |
783 // No stubs for ICs | |
784 // Clean IC | |
785 ResourceMark rm; | |
786 CompiledIC* icache = CompiledIC_at(this); | |
787 icache->set_to_clean(); | |
788 } | |
789 | |
790 | |
791 address opt_virtual_call_Relocation::static_stub() { | |
792 // search for the static stub who points back to this static call | |
793 address static_call_addr = addr(); | |
794 RelocIterator iter(code()); | |
795 while (iter.next()) { | |
796 if (iter.type() == relocInfo::static_stub_type) { | |
797 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
798 return iter.addr(); | |
799 } | |
800 } | |
801 } | |
802 return NULL; | |
803 } | |
804 | |
805 | |
806 void static_call_Relocation::clear_inline_cache() { | |
807 // Safe call site info | |
808 CompiledStaticCall* handler = compiledStaticCall_at(this); | |
809 handler->set_to_clean(); | |
810 } | |
811 | |
812 | |
813 address static_call_Relocation::static_stub() { | |
814 // search for the static stub who points back to this static call | |
815 address static_call_addr = addr(); | |
816 RelocIterator iter(code()); | |
817 while (iter.next()) { | |
818 if (iter.type() == relocInfo::static_stub_type) { | |
819 if (iter.static_stub_reloc()->static_call() == static_call_addr) { | |
820 return iter.addr(); | |
821 } | |
822 } | |
823 } | |
824 return NULL; | |
825 } | |
826 | |
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827 // Finds the trampoline address for a call. If no trampoline stub is |
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828 // found NULL is returned which can be handled by the caller. |
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829 address trampoline_stub_Relocation::get_trampoline_for(address call, nmethod* code) { |
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830 // There are no relocations available when the code gets relocated |
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831 // because of CodeBuffer expansion. |
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832 if (code->relocation_size() == 0) |
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833 return NULL; |
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834 |
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835 RelocIterator iter(code, call); |
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836 while (iter.next()) { |
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837 if (iter.type() == relocInfo::trampoline_stub_type) { |
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838 if (iter.trampoline_stub_reloc()->owner() == call) { |
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839 return iter.addr(); |
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840 } |
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841 } |
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842 } |
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843 |
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844 return NULL; |
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845 } |
0 | 846 |
847 void static_stub_Relocation::clear_inline_cache() { | |
848 // Call stub is only used when calling the interpreted code. | |
849 // It does not really need to be cleared, except that we want to clean out the methodoop. | |
850 CompiledStaticCall::set_stub_to_clean(this); | |
851 } | |
852 | |
853 | |
854 void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
855 address target = _target; | |
856 if (target == NULL) { | |
857 // An absolute embedded reference to an external location, | |
858 // which means there is nothing to fix here. | |
859 return; | |
860 } | |
861 // Probably this reference is absolute, not relative, so the | |
862 // following is probably a no-op. | |
863 assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity"); | |
864 set_value(target); | |
865 } | |
866 | |
867 | |
868 address external_word_Relocation::target() { | |
869 address target = _target; | |
870 if (target == NULL) { | |
871 target = pd_get_address_from_code(); | |
872 } | |
873 return target; | |
874 } | |
875 | |
876 | |
877 void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
878 address target = _target; | |
879 if (target == NULL) { | |
880 if (addr_in_const()) { | |
881 target = new_addr_for(*(address*)addr(), src, dest); | |
882 } else { | |
883 target = new_addr_for(pd_get_address_from_code(), src, dest); | |
884 } | |
885 } | |
886 set_value(target); | |
887 } | |
888 | |
889 | |
890 address internal_word_Relocation::target() { | |
891 address target = _target; | |
892 if (target == NULL) { | |
893 target = pd_get_address_from_code(); | |
894 } | |
895 return target; | |
896 } | |
897 | |
898 //--------------------------------------------------------------------------------- | |
899 // Non-product code | |
900 | |
901 #ifndef PRODUCT | |
902 | |
903 static const char* reloc_type_string(relocInfo::relocType t) { | |
904 switch (t) { | |
905 #define EACH_CASE(name) \ | |
906 case relocInfo::name##_type: \ | |
907 return #name; | |
908 | |
909 APPLY_TO_RELOCATIONS(EACH_CASE); | |
910 #undef EACH_CASE | |
911 | |
912 case relocInfo::none: | |
913 return "none"; | |
914 case relocInfo::data_prefix_tag: | |
915 return "prefix"; | |
916 default: | |
917 return "UNKNOWN RELOC TYPE"; | |
918 } | |
919 } | |
920 | |
921 | |
922 void RelocIterator::print_current() { | |
923 if (!has_current()) { | |
924 tty->print_cr("(no relocs)"); | |
925 return; | |
926 } | |
2002 | 927 tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT " offset=%d", |
928 _current, type(), reloc_type_string((relocInfo::relocType) type()), _addr, _current->addr_offset()); | |
0 | 929 if (current()->format() != 0) |
930 tty->print(" format=%d", current()->format()); | |
931 if (datalen() == 1) { | |
932 tty->print(" data=%d", data()[0]); | |
933 } else if (datalen() > 0) { | |
934 tty->print(" data={"); | |
935 for (int i = 0; i < datalen(); i++) { | |
936 tty->print("%04x", data()[i] & 0xFFFF); | |
937 } | |
938 tty->print("}"); | |
939 } | |
940 tty->print("]"); | |
941 switch (type()) { | |
942 case relocInfo::oop_type: | |
943 { | |
944 oop_Relocation* r = oop_reloc(); | |
945 oop* oop_addr = NULL; | |
946 oop raw_oop = NULL; | |
947 oop oop_value = NULL; | |
948 if (code() != NULL || r->oop_is_immediate()) { | |
949 oop_addr = r->oop_addr(); | |
950 raw_oop = *oop_addr; | |
951 oop_value = r->oop_value(); | |
952 } | |
953 tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", | |
954 oop_addr, (address)raw_oop, r->offset()); | |
955 // Do not print the oop by default--we want this routine to | |
956 // work even during GC or other inconvenient times. | |
957 if (WizardMode && oop_value != NULL) { | |
958 tty->print("oop_value=" INTPTR_FORMAT ": ", (address)oop_value); | |
959 oop_value->print_value_on(tty); | |
960 } | |
961 break; | |
962 } | |
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963 case relocInfo::metadata_type: |
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964 { |
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965 metadata_Relocation* r = metadata_reloc(); |
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966 Metadata** metadata_addr = NULL; |
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967 Metadata* raw_metadata = NULL; |
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968 Metadata* metadata_value = NULL; |
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969 if (code() != NULL || r->metadata_is_immediate()) { |
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970 metadata_addr = r->metadata_addr(); |
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971 raw_metadata = *metadata_addr; |
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972 metadata_value = r->metadata_value(); |
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973 } |
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974 tty->print(" | [metadata_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", |
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975 metadata_addr, (address)raw_metadata, r->offset()); |
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976 if (metadata_value != NULL) { |
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977 tty->print("metadata_value=" INTPTR_FORMAT ": ", (address)metadata_value); |
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978 metadata_value->print_value_on(tty); |
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979 } |
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980 break; |
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981 } |
0 | 982 case relocInfo::external_word_type: |
983 case relocInfo::internal_word_type: | |
984 case relocInfo::section_word_type: | |
985 { | |
986 DataRelocation* r = (DataRelocation*) reloc(); | |
987 tty->print(" | [target=" INTPTR_FORMAT "]", r->value()); //value==target | |
988 break; | |
989 } | |
990 case relocInfo::static_call_type: | |
991 case relocInfo::runtime_call_type: | |
992 { | |
993 CallRelocation* r = (CallRelocation*) reloc(); | |
994 tty->print(" | [destination=" INTPTR_FORMAT "]", r->destination()); | |
995 break; | |
996 } | |
997 case relocInfo::virtual_call_type: | |
998 { | |
999 virtual_call_Relocation* r = (virtual_call_Relocation*) reloc(); | |
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1000 tty->print(" | [destination=" INTPTR_FORMAT " cached_value=" INTPTR_FORMAT "]", |
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1001 r->destination(), r->cached_value()); |
0 | 1002 break; |
1003 } | |
1004 case relocInfo::static_stub_type: | |
1005 { | |
1006 static_stub_Relocation* r = (static_stub_Relocation*) reloc(); | |
1007 tty->print(" | [static_call=" INTPTR_FORMAT "]", r->static_call()); | |
1008 break; | |
1009 } | |
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1010 case relocInfo::trampoline_stub_type: |
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1011 { |
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1012 trampoline_stub_Relocation* r = (trampoline_stub_Relocation*) reloc(); |
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1013 tty->print(" | [trampoline owner=" INTPTR_FORMAT "]", r->owner()); |
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1014 break; |
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1015 } |
0 | 1016 } |
1017 tty->cr(); | |
1018 } | |
1019 | |
1020 | |
1021 void RelocIterator::print() { | |
1022 RelocIterator save_this = (*this); | |
1023 relocInfo* scan = _current; | |
1024 if (!has_current()) scan += 1; // nothing to scan here! | |
1025 | |
1026 bool skip_next = has_current(); | |
1027 bool got_next; | |
1028 while (true) { | |
1029 got_next = (skip_next || next()); | |
1030 skip_next = false; | |
1031 | |
1032 tty->print(" @" INTPTR_FORMAT ": ", scan); | |
1033 relocInfo* newscan = _current+1; | |
1034 if (!has_current()) newscan -= 1; // nothing to scan here! | |
1035 while (scan < newscan) { | |
1036 tty->print("%04x", *(short*)scan & 0xFFFF); | |
1037 scan++; | |
1038 } | |
1039 tty->cr(); | |
1040 | |
1041 if (!got_next) break; | |
1042 print_current(); | |
1043 } | |
1044 | |
1045 (*this) = save_this; | |
1046 } | |
1047 | |
1048 // For the debugger: | |
1049 extern "C" | |
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1050 void print_blob_locs(nmethod* nm) { |
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1051 nm->print(); |
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1052 RelocIterator iter(nm); |
0 | 1053 iter.print(); |
1054 } | |
1055 extern "C" | |
1056 void print_buf_locs(CodeBuffer* cb) { | |
1057 FlagSetting fs(PrintRelocations, true); | |
1058 cb->print(); | |
1059 } | |
1060 #endif // !PRODUCT |