1/*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "code/codeCache.hpp"
27#include "code/compiledIC.hpp"
28#include "code/nmethod.hpp"
29#include "code/relocInfo.hpp"
30#include "memory/resourceArea.hpp"
31#include "memory/universe.hpp"
32#include "oops/compressedOops.inline.hpp"
33#include "runtime/flags/flagSetting.hpp"
34#include "runtime/stubCodeGenerator.hpp"
35#include "utilities/copy.hpp"
36#include "oops/oop.inline.hpp"
37
38const RelocationHolder RelocationHolder::none; // its type is relocInfo::none
39
40
41// Implementation of relocInfo
42
43#ifdef ASSERT
44relocInfo::relocInfo(relocType t, int off, int f) {
45 assert(t != data_prefix_tag, "cannot build a prefix this way");
46 assert((t & type_mask) == t, "wrong type");
47 assert((f & format_mask) == f, "wrong format");
48 assert(off >= 0 && off < offset_limit(), "offset out off bounds");
49 assert((off & (offset_unit-1)) == 0, "misaligned offset");
50 (*this) = relocInfo(t, RAW_BITS, off, f);
51}
52#endif
53
54void relocInfo::initialize(CodeSection* dest, Relocation* reloc) {
55 relocInfo* data = this+1; // here's where the data might go
56 dest->set_locs_end(data); // sync end: the next call may read dest.locs_end
57 reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end
58 relocInfo* data_limit = dest->locs_end();
59 if (data_limit > data) {
60 relocInfo suffix = (*this);
61 data_limit = this->finish_prefix((short*) data_limit);
62 // Finish up with the suffix. (Hack note: pack_data_to might edit this.)
63 *data_limit = suffix;
64 dest->set_locs_end(data_limit+1);
65 }
66}
67
68relocInfo* relocInfo::finish_prefix(short* prefix_limit) {
69 assert(sizeof(relocInfo) == sizeof(short), "change this code");
70 short* p = (short*)(this+1);
71 assert(prefix_limit >= p, "must be a valid span of data");
72 int plen = prefix_limit - p;
73 if (plen == 0) {
74 debug_only(_value = 0xFFFF);
75 return this; // no data: remove self completely
76 }
77 if (plen == 1 && fits_into_immediate(p[0])) {
78 (*this) = immediate_relocInfo(p[0]); // move data inside self
79 return this+1;
80 }
81 // cannot compact, so just update the count and return the limit pointer
82 (*this) = prefix_relocInfo(plen); // write new datalen
83 assert(data() + datalen() == prefix_limit, "pointers must line up");
84 return (relocInfo*)prefix_limit;
85}
86
87void relocInfo::set_type(relocType t) {
88 int old_offset = addr_offset();
89 int old_format = format();
90 (*this) = relocInfo(t, old_offset, old_format);
91 assert(type()==(int)t, "sanity check");
92 assert(addr_offset()==old_offset, "sanity check");
93 assert(format()==old_format, "sanity check");
94}
95
96void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) {
97 bool found = false;
98 while (itr->next() && !found) {
99 if (itr->addr() == pc) {
100 assert(itr->type()==old_type, "wrong relocInfo type found");
101 itr->current()->set_type(new_type);
102 found=true;
103 }
104 }
105 assert(found, "no relocInfo found for pc");
106}
107
108
109// ----------------------------------------------------------------------------------------------------
110// Implementation of RelocIterator
111
112void RelocIterator::initialize(CompiledMethod* nm, address begin, address limit) {
113 initialize_misc();
114
115 if (nm == NULL && begin != NULL) {
116 // allow nmethod to be deduced from beginning address
117 CodeBlob* cb = CodeCache::find_blob(begin);
118 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
119 }
120 guarantee(nm != NULL, "must be able to deduce nmethod from other arguments");
121
122 _code = nm;
123 _current = nm->relocation_begin() - 1;
124 _end = nm->relocation_end();
125 _addr = nm->content_begin();
126
127 // Initialize code sections.
128 _section_start[CodeBuffer::SECT_CONSTS] = nm->consts_begin();
129 _section_start[CodeBuffer::SECT_INSTS ] = nm->insts_begin() ;
130 _section_start[CodeBuffer::SECT_STUBS ] = nm->stub_begin() ;
131
132 _section_end [CodeBuffer::SECT_CONSTS] = nm->consts_end() ;
133 _section_end [CodeBuffer::SECT_INSTS ] = nm->insts_end() ;
134 _section_end [CodeBuffer::SECT_STUBS ] = nm->stub_end() ;
135
136 assert(!has_current(), "just checking");
137 assert(begin == NULL || begin >= nm->code_begin(), "in bounds");
138 assert(limit == NULL || limit <= nm->code_end(), "in bounds");
139 set_limits(begin, limit);
140}
141
142
143RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) {
144 initialize_misc();
145
146 _current = cs->locs_start()-1;
147 _end = cs->locs_end();
148 _addr = cs->start();
149 _code = NULL; // Not cb->blob();
150
151 CodeBuffer* cb = cs->outer();
152 assert((int) SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal");
153 for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) {
154 CodeSection* cs = cb->code_section(n);
155 _section_start[n] = cs->start();
156 _section_end [n] = cs->end();
157 }
158
159 assert(!has_current(), "just checking");
160
161 assert(begin == NULL || begin >= cs->start(), "in bounds");
162 assert(limit == NULL || limit <= cs->end(), "in bounds");
163 set_limits(begin, limit);
164}
165
166bool RelocIterator::addr_in_const() const {
167 const int n = CodeBuffer::SECT_CONSTS;
168 return section_start(n) <= addr() && addr() < section_end(n);
169}
170
171
172void RelocIterator::set_limits(address begin, address limit) {
173 _limit = limit;
174
175 // the limit affects this next stuff:
176 if (begin != NULL) {
177 relocInfo* backup;
178 address backup_addr;
179 while (true) {
180 backup = _current;
181 backup_addr = _addr;
182 if (!next() || addr() >= begin) break;
183 }
184 // At this point, either we are at the first matching record,
185 // or else there is no such record, and !has_current().
186 // In either case, revert to the immediatly preceding state.
187 _current = backup;
188 _addr = backup_addr;
189 set_has_current(false);
190 }
191}
192
193
194// All the strange bit-encodings are in here.
195// The idea is to encode relocation data which are small integers
196// very efficiently (a single extra halfword). Larger chunks of
197// relocation data need a halfword header to hold their size.
198void RelocIterator::advance_over_prefix() {
199 if (_current->is_datalen()) {
200 _data = (short*) _current->data();
201 _datalen = _current->datalen();
202 _current += _datalen + 1; // skip the embedded data & header
203 } else {
204 _databuf = _current->immediate();
205 _data = &_databuf;
206 _datalen = 1;
207 _current++; // skip the header
208 }
209 // The client will see the following relocInfo, whatever that is.
210 // It is the reloc to which the preceding data applies.
211}
212
213
214void RelocIterator::initialize_misc() {
215 set_has_current(false);
216 for (int i = (int) CodeBuffer::SECT_FIRST; i < (int) CodeBuffer::SECT_LIMIT; i++) {
217 _section_start[i] = NULL; // these will be lazily computed, if needed
218 _section_end [i] = NULL;
219 }
220}
221
222
223Relocation* RelocIterator::reloc() {
224 // (take the "switch" out-of-line)
225 relocInfo::relocType t = type();
226 if (false) {}
227 #define EACH_TYPE(name) \
228 else if (t == relocInfo::name##_type) { \
229 return name##_reloc(); \
230 }
231 APPLY_TO_RELOCATIONS(EACH_TYPE);
232 #undef EACH_TYPE
233 assert(t == relocInfo::none, "must be padding");
234 return new(_rh) Relocation();
235}
236
237
238//////// Methods for flyweight Relocation types
239
240
241RelocationHolder RelocationHolder::plus(int offset) const {
242 if (offset != 0) {
243 switch (type()) {
244 case relocInfo::none:
245 break;
246 case relocInfo::oop_type:
247 {
248 oop_Relocation* r = (oop_Relocation*)reloc();
249 return oop_Relocation::spec(r->oop_index(), r->offset() + offset);
250 }
251 case relocInfo::metadata_type:
252 {
253 metadata_Relocation* r = (metadata_Relocation*)reloc();
254 return metadata_Relocation::spec(r->metadata_index(), r->offset() + offset);
255 }
256 default:
257 ShouldNotReachHere();
258 }
259 }
260 return (*this);
261}
262
263
264void Relocation::guarantee_size() {
265 guarantee(false, "Make _relocbuf bigger!");
266}
267
268 // some relocations can compute their own values
269address Relocation::value() {
270 ShouldNotReachHere();
271 return NULL;
272}
273
274
275void Relocation::set_value(address x) {
276 ShouldNotReachHere();
277}
278
279void Relocation::const_set_data_value(address x) {
280#ifdef _LP64
281 if (format() == relocInfo::narrow_oop_in_const) {
282 *(narrowOop*)addr() = CompressedOops::encode((oop) x);
283 } else {
284#endif
285 *(address*)addr() = x;
286#ifdef _LP64
287 }
288#endif
289}
290
291void Relocation::const_verify_data_value(address x) {
292#ifdef _LP64
293 if (format() == relocInfo::narrow_oop_in_const) {
294 guarantee(*(narrowOop*)addr() == CompressedOops::encode((oop) x), "must agree");
295 } else {
296#endif
297 guarantee(*(address*)addr() == x, "must agree");
298#ifdef _LP64
299 }
300#endif
301}
302
303
304RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) {
305 if (rtype == relocInfo::none) return RelocationHolder::none;
306 relocInfo ri = relocInfo(rtype, 0);
307 RelocIterator itr;
308 itr.set_current(ri);
309 itr.reloc();
310 return itr._rh;
311}
312
313address Relocation::old_addr_for(address newa,
314 const CodeBuffer* src, CodeBuffer* dest) {
315 int sect = dest->section_index_of(newa);
316 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
317 address ostart = src->code_section(sect)->start();
318 address nstart = dest->code_section(sect)->start();
319 return ostart + (newa - nstart);
320}
321
322address Relocation::new_addr_for(address olda,
323 const CodeBuffer* src, CodeBuffer* dest) {
324 debug_only(const CodeBuffer* src0 = src);
325 int sect = CodeBuffer::SECT_NONE;
326 // Look for olda in the source buffer, and all previous incarnations
327 // if the source buffer has been expanded.
328 for (; src != NULL; src = src->before_expand()) {
329 sect = src->section_index_of(olda);
330 if (sect != CodeBuffer::SECT_NONE) break;
331 }
332 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
333 address ostart = src->code_section(sect)->start();
334 address nstart = dest->code_section(sect)->start();
335 return nstart + (olda - ostart);
336}
337
338void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) {
339 address addr0 = addr;
340 if (addr0 == NULL || dest->allocates2(addr0)) return;
341 CodeBuffer* cb = dest->outer();
342 addr = new_addr_for(addr0, cb, cb);
343 assert(allow_other_sections || dest->contains2(addr),
344 "addr must be in required section");
345}
346
347
348void CallRelocation::set_destination(address x) {
349 pd_set_call_destination(x);
350}
351
352void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
353 // Usually a self-relative reference to an external routine.
354 // On some platforms, the reference is absolute (not self-relative).
355 // The enhanced use of pd_call_destination sorts this all out.
356 address orig_addr = old_addr_for(addr(), src, dest);
357 address callee = pd_call_destination(orig_addr);
358 // Reassert the callee address, this time in the new copy of the code.
359 pd_set_call_destination(callee);
360}
361
362
363//// pack/unpack methods
364
365void oop_Relocation::pack_data_to(CodeSection* dest) {
366 short* p = (short*) dest->locs_end();
367 p = pack_2_ints_to(p, _oop_index, _offset);
368 dest->set_locs_end((relocInfo*) p);
369}
370
371
372void oop_Relocation::unpack_data() {
373 unpack_2_ints(_oop_index, _offset);
374}
375
376void metadata_Relocation::pack_data_to(CodeSection* dest) {
377 short* p = (short*) dest->locs_end();
378 p = pack_2_ints_to(p, _metadata_index, _offset);
379 dest->set_locs_end((relocInfo*) p);
380}
381
382
383void metadata_Relocation::unpack_data() {
384 unpack_2_ints(_metadata_index, _offset);
385}
386
387
388void virtual_call_Relocation::pack_data_to(CodeSection* dest) {
389 short* p = (short*) dest->locs_end();
390 address point = dest->locs_point();
391
392 normalize_address(_cached_value, dest);
393 jint x0 = scaled_offset_null_special(_cached_value, point);
394 p = pack_2_ints_to(p, x0, _method_index);
395 dest->set_locs_end((relocInfo*) p);
396}
397
398
399void virtual_call_Relocation::unpack_data() {
400 jint x0 = 0;
401 unpack_2_ints(x0, _method_index);
402 address point = addr();
403 _cached_value = x0==0? NULL: address_from_scaled_offset(x0, point);
404}
405
406void runtime_call_w_cp_Relocation::pack_data_to(CodeSection * dest) {
407 short* p = pack_1_int_to((short *)dest->locs_end(), (jint)(_offset >> 2));
408 dest->set_locs_end((relocInfo*) p);
409}
410
411void runtime_call_w_cp_Relocation::unpack_data() {
412 _offset = unpack_1_int() << 2;
413}
414
415void static_stub_Relocation::pack_data_to(CodeSection* dest) {
416 short* p = (short*) dest->locs_end();
417 CodeSection* insts = dest->outer()->insts();
418 normalize_address(_static_call, insts);
419 jint is_aot = _is_aot ? 1 : 0;
420 p = pack_2_ints_to(p, scaled_offset(_static_call, insts->start()), is_aot);
421 dest->set_locs_end((relocInfo*) p);
422}
423
424void static_stub_Relocation::unpack_data() {
425 address base = binding()->section_start(CodeBuffer::SECT_INSTS);
426 jint offset;
427 jint is_aot;
428 unpack_2_ints(offset, is_aot);
429 _static_call = address_from_scaled_offset(offset, base);
430 _is_aot = (is_aot == 1);
431}
432
433void trampoline_stub_Relocation::pack_data_to(CodeSection* dest ) {
434 short* p = (short*) dest->locs_end();
435 CodeSection* insts = dest->outer()->insts();
436 normalize_address(_owner, insts);
437 p = pack_1_int_to(p, scaled_offset(_owner, insts->start()));
438 dest->set_locs_end((relocInfo*) p);
439}
440
441void trampoline_stub_Relocation::unpack_data() {
442 address base = binding()->section_start(CodeBuffer::SECT_INSTS);
443 _owner = address_from_scaled_offset(unpack_1_int(), base);
444}
445
446void external_word_Relocation::pack_data_to(CodeSection* dest) {
447 short* p = (short*) dest->locs_end();
448#ifndef _LP64
449 p = pack_1_int_to(p, (int32_t) (intptr_t)_target);
450#else
451 jlong t = (jlong) _target;
452 int32_t lo = low(t);
453 int32_t hi = high(t);
454 p = pack_2_ints_to(p, lo, hi);
455#endif /* _LP64 */
456 dest->set_locs_end((relocInfo*) p);
457}
458
459
460void external_word_Relocation::unpack_data() {
461#ifndef _LP64
462 _target = (address) (intptr_t)unpack_1_int();
463#else
464 jint lo, hi;
465 unpack_2_ints(lo, hi);
466 jlong t = jlong_from(hi, lo);;
467 _target = (address) t;
468#endif /* _LP64 */
469}
470
471
472void internal_word_Relocation::pack_data_to(CodeSection* dest) {
473 short* p = (short*) dest->locs_end();
474 normalize_address(_target, dest, true);
475
476 // Check whether my target address is valid within this section.
477 // If not, strengthen the relocation type to point to another section.
478 int sindex = _section;
479 if (sindex == CodeBuffer::SECT_NONE && _target != NULL
480 && (!dest->allocates(_target) || _target == dest->locs_point())) {
481 sindex = dest->outer()->section_index_of(_target);
482 guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere");
483 relocInfo* base = dest->locs_end() - 1;
484 assert(base->type() == this->type(), "sanity");
485 // Change the written type, to be section_word_type instead.
486 base->set_type(relocInfo::section_word_type);
487 }
488
489 // Note: An internal_word relocation cannot refer to its own instruction,
490 // because we reserve "0" to mean that the pointer itself is embedded
491 // in the code stream. We use a section_word relocation for such cases.
492
493 if (sindex == CodeBuffer::SECT_NONE) {
494 assert(type() == relocInfo::internal_word_type, "must be base class");
495 guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section");
496 jint x0 = scaled_offset_null_special(_target, dest->locs_point());
497 assert(!(x0 == 0 && _target != NULL), "correct encoding of null target");
498 p = pack_1_int_to(p, x0);
499 } else {
500 assert(_target != NULL, "sanity");
501 CodeSection* sect = dest->outer()->code_section(sindex);
502 guarantee(sect->allocates2(_target), "must be in correct section");
503 address base = sect->start();
504 jint offset = scaled_offset(_target, base);
505 assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity");
506 assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++");
507 p = pack_1_int_to(p, (offset << section_width) | sindex);
508 }
509
510 dest->set_locs_end((relocInfo*) p);
511}
512
513
514void internal_word_Relocation::unpack_data() {
515 jint x0 = unpack_1_int();
516 _target = x0==0? NULL: address_from_scaled_offset(x0, addr());
517 _section = CodeBuffer::SECT_NONE;
518}
519
520
521void section_word_Relocation::unpack_data() {
522 jint x = unpack_1_int();
523 jint offset = (x >> section_width);
524 int sindex = (x & ((1<<section_width)-1));
525 address base = binding()->section_start(sindex);
526
527 _section = sindex;
528 _target = address_from_scaled_offset(offset, base);
529}
530
531//// miscellaneous methods
532oop* oop_Relocation::oop_addr() {
533 int n = _oop_index;
534 if (n == 0) {
535 // oop is stored in the code stream
536 return (oop*) pd_address_in_code();
537 } else {
538 // oop is stored in table at nmethod::oops_begin
539 return code()->oop_addr_at(n);
540 }
541}
542
543
544oop oop_Relocation::oop_value() {
545 oop v = *oop_addr();
546 // clean inline caches store a special pseudo-null
547 if (v == Universe::non_oop_word()) v = NULL;
548 return v;
549}
550
551
552void oop_Relocation::fix_oop_relocation() {
553 if (!oop_is_immediate()) {
554 // get the oop from the pool, and re-insert it into the instruction:
555 set_value(value());
556 }
557}
558
559
560void oop_Relocation::verify_oop_relocation() {
561 if (!oop_is_immediate()) {
562 // get the oop from the pool, and re-insert it into the instruction:
563 verify_value(value());
564 }
565}
566
567// meta data versions
568Metadata** metadata_Relocation::metadata_addr() {
569 int n = _metadata_index;
570 if (n == 0) {
571 // metadata is stored in the code stream
572 return (Metadata**) pd_address_in_code();
573 } else {
574 // metadata is stored in table at nmethod::metadatas_begin
575 return code()->metadata_addr_at(n);
576 }
577 }
578
579
580Metadata* metadata_Relocation::metadata_value() {
581 Metadata* v = *metadata_addr();
582 // clean inline caches store a special pseudo-null
583 if (v == (Metadata*)Universe::non_oop_word()) v = NULL;
584 return v;
585 }
586
587
588void metadata_Relocation::fix_metadata_relocation() {
589 if (!metadata_is_immediate()) {
590 // get the metadata from the pool, and re-insert it into the instruction:
591 pd_fix_value(value());
592 }
593}
594
595address virtual_call_Relocation::cached_value() {
596 assert(_cached_value != NULL && _cached_value < addr(), "must precede ic_call");
597 return _cached_value;
598}
599
600Method* virtual_call_Relocation::method_value() {
601 CompiledMethod* cm = code();
602 if (cm == NULL) return (Method*)NULL;
603 Metadata* m = cm->metadata_at(_method_index);
604 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
605 assert(m == NULL || m->is_method(), "not a method");
606 return (Method*)m;
607}
608
609bool virtual_call_Relocation::clear_inline_cache() {
610 // No stubs for ICs
611 // Clean IC
612 ResourceMark rm;
613 CompiledIC* icache = CompiledIC_at(this);
614 return icache->set_to_clean();
615}
616
617
618void opt_virtual_call_Relocation::pack_data_to(CodeSection* dest) {
619 short* p = (short*) dest->locs_end();
620 p = pack_1_int_to(p, _method_index);
621 dest->set_locs_end((relocInfo*) p);
622}
623
624void opt_virtual_call_Relocation::unpack_data() {
625 _method_index = unpack_1_int();
626}
627
628Method* opt_virtual_call_Relocation::method_value() {
629 CompiledMethod* cm = code();
630 if (cm == NULL) return (Method*)NULL;
631 Metadata* m = cm->metadata_at(_method_index);
632 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
633 assert(m == NULL || m->is_method(), "not a method");
634 return (Method*)m;
635}
636
637template<typename CompiledICorStaticCall>
638static bool set_to_clean_no_ic_refill(CompiledICorStaticCall* ic) {
639 guarantee(ic->set_to_clean(), "Should not need transition stubs");
640 return true;
641}
642
643bool opt_virtual_call_Relocation::clear_inline_cache() {
644 // No stubs for ICs
645 // Clean IC
646 ResourceMark rm;
647 CompiledIC* icache = CompiledIC_at(this);
648 return set_to_clean_no_ic_refill(icache);
649}
650
651address opt_virtual_call_Relocation::static_stub(bool is_aot) {
652 // search for the static stub who points back to this static call
653 address static_call_addr = addr();
654 RelocIterator iter(code());
655 while (iter.next()) {
656 if (iter.type() == relocInfo::static_stub_type) {
657 static_stub_Relocation* stub_reloc = iter.static_stub_reloc();
658 if (stub_reloc->static_call() == static_call_addr && stub_reloc->is_aot() == is_aot) {
659 return iter.addr();
660 }
661 }
662 }
663 return NULL;
664}
665
666Method* static_call_Relocation::method_value() {
667 CompiledMethod* cm = code();
668 if (cm == NULL) return (Method*)NULL;
669 Metadata* m = cm->metadata_at(_method_index);
670 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index");
671 assert(m == NULL || m->is_method(), "not a method");
672 return (Method*)m;
673}
674
675void static_call_Relocation::pack_data_to(CodeSection* dest) {
676 short* p = (short*) dest->locs_end();
677 p = pack_1_int_to(p, _method_index);
678 dest->set_locs_end((relocInfo*) p);
679}
680
681void static_call_Relocation::unpack_data() {
682 _method_index = unpack_1_int();
683}
684
685bool static_call_Relocation::clear_inline_cache() {
686 // Safe call site info
687 CompiledStaticCall* handler = this->code()->compiledStaticCall_at(this);
688 return set_to_clean_no_ic_refill(handler);
689}
690
691
692address static_call_Relocation::static_stub(bool is_aot) {
693 // search for the static stub who points back to this static call
694 address static_call_addr = addr();
695 RelocIterator iter(code());
696 while (iter.next()) {
697 if (iter.type() == relocInfo::static_stub_type) {
698 static_stub_Relocation* stub_reloc = iter.static_stub_reloc();
699 if (stub_reloc->static_call() == static_call_addr && stub_reloc->is_aot() == is_aot) {
700 return iter.addr();
701 }
702 }
703 }
704 return NULL;
705}
706
707// Finds the trampoline address for a call. If no trampoline stub is
708// found NULL is returned which can be handled by the caller.
709address trampoline_stub_Relocation::get_trampoline_for(address call, nmethod* code) {
710 // There are no relocations available when the code gets relocated
711 // because of CodeBuffer expansion.
712 if (code->relocation_size() == 0)
713 return NULL;
714
715 RelocIterator iter(code, call);
716 while (iter.next()) {
717 if (iter.type() == relocInfo::trampoline_stub_type) {
718 if (iter.trampoline_stub_reloc()->owner() == call) {
719 return iter.addr();
720 }
721 }
722 }
723
724 return NULL;
725}
726
727bool static_stub_Relocation::clear_inline_cache() {
728 // Call stub is only used when calling the interpreted code.
729 // It does not really need to be cleared, except that we want to clean out the methodoop.
730 CompiledDirectStaticCall::set_stub_to_clean(this);
731 return true;
732}
733
734
735void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
736 address target = _target;
737 if (target == NULL) {
738 // An absolute embedded reference to an external location,
739 // which means there is nothing to fix here.
740 return;
741 }
742 // Probably this reference is absolute, not relative, so the
743 // following is probably a no-op.
744 assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity");
745 set_value(target);
746}
747
748
749address external_word_Relocation::target() {
750 address target = _target;
751 if (target == NULL) {
752 target = pd_get_address_from_code();
753 }
754 return target;
755}
756
757
758void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
759 address target = _target;
760 if (target == NULL) {
761 target = new_addr_for(this->target(), src, dest);
762 }
763 set_value(target);
764}
765
766
767address internal_word_Relocation::target() {
768 address target = _target;
769 if (target == NULL) {
770 if (addr_in_const()) {
771 target = *(address*)addr();
772 } else {
773 target = pd_get_address_from_code();
774 }
775 }
776 return target;
777}
778
779//---------------------------------------------------------------------------------
780// Non-product code
781
782#ifndef PRODUCT
783
784static const char* reloc_type_string(relocInfo::relocType t) {
785 switch (t) {
786 #define EACH_CASE(name) \
787 case relocInfo::name##_type: \
788 return #name;
789
790 APPLY_TO_RELOCATIONS(EACH_CASE);
791 #undef EACH_CASE
792
793 case relocInfo::none:
794 return "none";
795 case relocInfo::data_prefix_tag:
796 return "prefix";
797 default:
798 return "UNKNOWN RELOC TYPE";
799 }
800}
801
802
803void RelocIterator::print_current() {
804 if (!has_current()) {
805 tty->print_cr("(no relocs)");
806 return;
807 }
808 tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT " offset=%d",
809 p2i(_current), type(), reloc_type_string((relocInfo::relocType) type()), p2i(_addr), _current->addr_offset());
810 if (current()->format() != 0)
811 tty->print(" format=%d", current()->format());
812 if (datalen() == 1) {
813 tty->print(" data=%d", data()[0]);
814 } else if (datalen() > 0) {
815 tty->print(" data={");
816 for (int i = 0; i < datalen(); i++) {
817 tty->print("%04x", data()[i] & 0xFFFF);
818 }
819 tty->print("}");
820 }
821 tty->print("]");
822 switch (type()) {
823 case relocInfo::oop_type:
824 {
825 oop_Relocation* r = oop_reloc();
826 oop* oop_addr = NULL;
827 oop raw_oop = NULL;
828 oop oop_value = NULL;
829 if (code() != NULL || r->oop_is_immediate()) {
830 oop_addr = r->oop_addr();
831 raw_oop = *oop_addr;
832 oop_value = r->oop_value();
833 }
834 tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]",
835 p2i(oop_addr), p2i(raw_oop), r->offset());
836 // Do not print the oop by default--we want this routine to
837 // work even during GC or other inconvenient times.
838 if (WizardMode && oop_value != NULL) {
839 tty->print("oop_value=" INTPTR_FORMAT ": ", p2i(oop_value));
840 if (oopDesc::is_oop(oop_value)) {
841 oop_value->print_value_on(tty);
842 }
843 }
844 break;
845 }
846 case relocInfo::metadata_type:
847 {
848 metadata_Relocation* r = metadata_reloc();
849 Metadata** metadata_addr = NULL;
850 Metadata* raw_metadata = NULL;
851 Metadata* metadata_value = NULL;
852 if (code() != NULL || r->metadata_is_immediate()) {
853 metadata_addr = r->metadata_addr();
854 raw_metadata = *metadata_addr;
855 metadata_value = r->metadata_value();
856 }
857 tty->print(" | [metadata_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]",
858 p2i(metadata_addr), p2i(raw_metadata), r->offset());
859 if (metadata_value != NULL) {
860 tty->print("metadata_value=" INTPTR_FORMAT ": ", p2i(metadata_value));
861 metadata_value->print_value_on(tty);
862 }
863 break;
864 }
865 case relocInfo::external_word_type:
866 case relocInfo::internal_word_type:
867 case relocInfo::section_word_type:
868 {
869 DataRelocation* r = (DataRelocation*) reloc();
870 tty->print(" | [target=" INTPTR_FORMAT "]", p2i(r->value())); //value==target
871 break;
872 }
873 case relocInfo::static_call_type:
874 {
875 static_call_Relocation* r = (static_call_Relocation*) reloc();
876 tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
877 p2i(r->destination()), p2i(r->method_value()));
878 break;
879 }
880 case relocInfo::runtime_call_type:
881 case relocInfo::runtime_call_w_cp_type:
882 {
883 CallRelocation* r = (CallRelocation*) reloc();
884 tty->print(" | [destination=" INTPTR_FORMAT "]", p2i(r->destination()));
885 break;
886 }
887 case relocInfo::virtual_call_type:
888 {
889 virtual_call_Relocation* r = (virtual_call_Relocation*) reloc();
890 tty->print(" | [destination=" INTPTR_FORMAT " cached_value=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
891 p2i(r->destination()), p2i(r->cached_value()), p2i(r->method_value()));
892 break;
893 }
894 case relocInfo::static_stub_type:
895 {
896 static_stub_Relocation* r = (static_stub_Relocation*) reloc();
897 tty->print(" | [static_call=" INTPTR_FORMAT "]", p2i(r->static_call()));
898 break;
899 }
900 case relocInfo::trampoline_stub_type:
901 {
902 trampoline_stub_Relocation* r = (trampoline_stub_Relocation*) reloc();
903 tty->print(" | [trampoline owner=" INTPTR_FORMAT "]", p2i(r->owner()));
904 break;
905 }
906 case relocInfo::opt_virtual_call_type:
907 {
908 opt_virtual_call_Relocation* r = (opt_virtual_call_Relocation*) reloc();
909 tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]",
910 p2i(r->destination()), p2i(r->method_value()));
911 break;
912 }
913 default:
914 break;
915 }
916 tty->cr();
917}
918
919
920void RelocIterator::print() {
921 RelocIterator save_this = (*this);
922 relocInfo* scan = _current;
923 if (!has_current()) scan += 1; // nothing to scan here!
924
925 bool skip_next = has_current();
926 bool got_next;
927 while (true) {
928 got_next = (skip_next || next());
929 skip_next = false;
930
931 tty->print(" @" INTPTR_FORMAT ": ", p2i(scan));
932 relocInfo* newscan = _current+1;
933 if (!has_current()) newscan -= 1; // nothing to scan here!
934 while (scan < newscan) {
935 tty->print("%04x", *(short*)scan & 0xFFFF);
936 scan++;
937 }
938 tty->cr();
939
940 if (!got_next) break;
941 print_current();
942 }
943
944 (*this) = save_this;
945}
946
947// For the debugger:
948extern "C"
949void print_blob_locs(nmethod* nm) {
950 nm->print();
951 RelocIterator iter(nm);
952 iter.print();
953}
954extern "C"
955void print_buf_locs(CodeBuffer* cb) {
956 FlagSetting fs(PrintRelocations, true);
957 cb->print();
958}
959#endif // !PRODUCT
960