1 /*
2 * Copyright (c) 2010, 2016, 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 #ifndef SHARE_VM_CLASSFILE_STACKMAPTABLEFORMAT_HPP
26 #define SHARE_VM_CLASSFILE_STACKMAPTABLEFORMAT_HPP
27
28 #include "classfile/verificationType.hpp"
29
30 // These classes represent the stack-map substructures described in the JVMS
31 // (hence the non-conforming naming scheme).
32
33 // These classes work with the types in their compressed form in-place (as they
34 // would appear in the classfile). No virtual methods or fields allowed.
35
36 class verification_type_info {
37 private:
38 // u1 tag
39 // u2 cpool_index || u2 bci (for ITEM_Object & ITEM_Uninitailized only)
40
41 address tag_addr() const { return (address)this; }
42 address cpool_index_addr() const { return tag_addr() + sizeof(u1); }
43 address bci_addr() const { return cpool_index_addr(); }
44
45 protected:
46 // No constructors - should be 'private', but GCC issues a warning if it is
47 verification_type_info() {}
48 verification_type_info(const verification_type_info&) {}
49
50 public:
51
52 static verification_type_info* at(address addr) {
53 return (verification_type_info*)addr;
54 }
55
56 static verification_type_info* create_at(address addr, u1 tag) {
57 verification_type_info* vti = (verification_type_info*)addr;
58 vti->set_tag(tag);
59 return vti;
60 }
61
62 static verification_type_info* create_object_at(address addr, u2 cp_idx) {
63 verification_type_info* vti = (verification_type_info*)addr;
64 vti->set_tag(ITEM_Object);
65 vti->set_cpool_index(cp_idx);
66 return vti;
67 }
68
69 static verification_type_info* create_uninit_at(address addr, u2 bci) {
70 verification_type_info* vti = (verification_type_info*)addr;
71 vti->set_tag(ITEM_Uninitialized);
72 vti->set_bci(bci);
73 return vti;
74 }
75
76 static size_t calculate_size(u1 tag) {
77 if (tag == ITEM_Object || tag == ITEM_Uninitialized) {
78 return sizeof(u1) + sizeof(u2);
79 } else {
80 return sizeof(u1);
81 }
82 }
83
84 static size_t max_size() { return sizeof(u1) + sizeof(u2); }
85
86 u1 tag() const { return *(u1*)tag_addr(); }
87 void set_tag(u1 tag) { *((u1*)tag_addr()) = tag; }
88
89 bool is_object() const { return tag() == ITEM_Object; }
90 bool is_uninitialized() const { return tag() == ITEM_Uninitialized; }
91
92 u2 cpool_index() const {
93 assert(is_object(), "This type has no cp_index");
94 return Bytes::get_Java_u2(cpool_index_addr());
95 }
96 void set_cpool_index(u2 idx) {
97 assert(is_object(), "This type has no cp_index");
98 Bytes::put_Java_u2(cpool_index_addr(), idx);
99 }
100
101 u2 bci() const {
102 assert(is_uninitialized(), "This type has no bci");
103 return Bytes::get_Java_u2(bci_addr());
104 }
105
106 void set_bci(u2 bci) {
107 assert(is_uninitialized(), "This type has no bci");
108 Bytes::put_Java_u2(bci_addr(), bci);
109 }
110
111 void copy_from(verification_type_info* from) {
112 set_tag(from->tag());
113 if (from->is_object()) {
114 set_cpool_index(from->cpool_index());
115 } else if (from->is_uninitialized()) {
116 set_bci(from->bci());
117 }
118 }
119
120 size_t size() const {
121 return calculate_size(tag());
122 }
123
124 verification_type_info* next() {
125 return (verification_type_info*)((address)this + size());
126 }
127
128 // This method is used when reading unverified data in order to ensure
129 // that we don't read past a particular memory limit. It returns false
130 // if any part of the data structure is outside the specified memory bounds.
131 bool verify(address start, address end) {
132 return ((address)this >= start &&
133 (address)this < end &&
134 (bci_addr() + sizeof(u2) <= end ||
135 !is_object() && !is_uninitialized()));
136 }
137
138 void print_on(outputStream* st) {
139 switch (tag()) {
140 case ITEM_Top: st->print("Top"); break;
141 case ITEM_Integer: st->print("Integer"); break;
142 case ITEM_Float: st->print("Float"); break;
143 case ITEM_Double: st->print("Double"); break;
144 case ITEM_Long: st->print("Long"); break;
145 case ITEM_Null: st->print("Null"); break;
146 case ITEM_UninitializedThis:
147 st->print("UninitializedThis"); break;
148 case ITEM_Uninitialized:
149 st->print("Uninitialized[#%d]", bci()); break;
150 case ITEM_Object:
151 st->print("Object[#%d]", cpool_index()); break;
152 default:
153 assert(false, "Bad verification_type_info");
154 }
155 }
156 };
157
158 #define FOR_EACH_STACKMAP_FRAME_TYPE(macro, arg1, arg2) \
159 macro(same_frame, arg1, arg2) \
160 macro(same_frame_extended, arg1, arg2) \
161 macro(same_locals_1_stack_item_frame, arg1, arg2) \
162 macro(same_locals_1_stack_item_extended, arg1, arg2) \
163 macro(chop_frame, arg1, arg2) \
164 macro(append_frame, arg1, arg2) \
165 macro(full_frame, arg1, arg2)
166
167 #define SM_FORWARD_DECL(type, arg1, arg2) class type;
168 FOR_EACH_STACKMAP_FRAME_TYPE(SM_FORWARD_DECL, x, x)
169 #undef SM_FORWARD_DECL
170
171 class stack_map_frame {
172 protected:
173 address frame_type_addr() const { return (address)this; }
174
175 // No constructors - should be 'private', but GCC issues a warning if it is
176 stack_map_frame() {}
177 stack_map_frame(const stack_map_frame&) {}
178
179 public:
180
181 static stack_map_frame* at(address addr) {
182 return (stack_map_frame*)addr;
183 }
184
185 stack_map_frame* next() const {
186 return at((address)this + size());
187 }
188
189 u1 frame_type() const { return *(u1*)frame_type_addr(); }
190 void set_frame_type(u1 type) { *((u1*)frame_type_addr()) = type; }
191
192 // pseudo-virtual methods
193 inline size_t size() const;
194 inline int offset_delta() const;
195 inline void set_offset_delta(int offset_delta);
196 inline int number_of_types() const; // number of types contained in the frame
197 inline verification_type_info* types() const; // pointer to first type
198 inline bool is_valid_offset(int offset_delta) const;
199
200 // This method must be used when reading unverified data in order to ensure
201 // that we don't read past a particular memory limit. It returns false
202 // if any part of the data structure is outside the specified memory bounds.
203 inline bool verify(address start, address end) const;
204
205 inline void print_on(outputStream* st, int current_offset) const;
206 inline void print_truncated(outputStream* st, int current_offset) const;
207
208 // Create as_xxx and is_xxx methods for the subtypes
209 #define FRAME_TYPE_DECL(stackmap_frame_type, arg1, arg2) \
210 inline stackmap_frame_type* as_##stackmap_frame_type() const; \
211 bool is_##stackmap_frame_type() { \
212 return as_##stackmap_frame_type() != NULL; \
213 }
214
215 FOR_EACH_STACKMAP_FRAME_TYPE(FRAME_TYPE_DECL, x, x)
216 #undef FRAME_TYPE_DECL
217 };
218
219 class same_frame : public stack_map_frame {
220 private:
221 static int frame_type_to_offset_delta(u1 frame_type) {
222 return frame_type + 1; }
223 static u1 offset_delta_to_frame_type(int offset_delta) {
224 return (u1)(offset_delta - 1); }
225
226 public:
227
228 static bool is_frame_type(u1 tag) {
229 return tag < 64;
230 }
231
232 static same_frame* at(address addr) {
233 assert(is_frame_type(*addr), "Wrong frame id");
234 return (same_frame*)addr;
235 }
236
237 static same_frame* create_at(address addr, int offset_delta) {
238 same_frame* sm = (same_frame*)addr;
239 sm->set_offset_delta(offset_delta);
240 return sm;
241 }
242
243 static size_t calculate_size() { return sizeof(u1); }
244
245 size_t size() const { return calculate_size(); }
246 int offset_delta() const { return frame_type_to_offset_delta(frame_type()); }
247
248 void set_offset_delta(int offset_delta) {
249 assert(offset_delta <= 64, "Offset too large for same_frame");
250 set_frame_type(offset_delta_to_frame_type(offset_delta));
251 }
252
253 int number_of_types() const { return 0; }
254 verification_type_info* types() const { return NULL; }
255
256 bool is_valid_offset(int offset_delta) const {
257 return is_frame_type(offset_delta_to_frame_type(offset_delta));
258 }
259
260 bool verify_subtype(address start, address end) const {
261 return true;
262 }
263
264 void print_on(outputStream* st, int current_offset = -1) const {
265 st->print("same_frame(@%d)", offset_delta() + current_offset);
266 }
267
268 void print_truncated(outputStream* st, int current_offset = -1) const {
269 print_on(st, current_offset);
270 }
271 };
272
273 class same_frame_extended : public stack_map_frame {
274 private:
275 enum { _frame_id = 251 };
276 address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }
277
278 public:
279 static bool is_frame_type(u1 tag) {
280 return tag == _frame_id;
281 }
282
283 static same_frame_extended* at(address addr) {
284 assert(is_frame_type(*addr), "Wrong frame type");
285 return (same_frame_extended*)addr;
286 }
287
288 static same_frame_extended* create_at(address addr, u2 offset_delta) {
289 same_frame_extended* sm = (same_frame_extended*)addr;
290 sm->set_frame_type(_frame_id);
291 sm->set_offset_delta(offset_delta);
292 return sm;
293 }
294
295 static size_t calculate_size() { return sizeof(u1) + sizeof(u2); }
296
297 size_t size() const { return calculate_size(); }
298 int offset_delta() const {
299 return Bytes::get_Java_u2(offset_delta_addr()) + 1;
300 }
301
302 void set_offset_delta(int offset_delta) {
303 Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);
304 }
305
306 int number_of_types() const { return 0; }
307 verification_type_info* types() const { return NULL; }
308 bool is_valid_offset(int offset) const { return true; }
309
310 bool verify_subtype(address start, address end) const {
311 return frame_type_addr() + size() <= end;
312 }
313
314 void print_on(outputStream* st, int current_offset = -1) const {
315 st->print("same_frame_extended(@%d)", offset_delta() + current_offset);
316 }
317
318 void print_truncated(outputStream* st, int current_offset = -1) const {
319 print_on(st, current_offset);
320 }
321 };
322
323 class same_locals_1_stack_item_frame : public stack_map_frame {
324 private:
325 address type_addr() const { return frame_type_addr() + sizeof(u1); }
326
327 static int frame_type_to_offset_delta(u1 frame_type) {
328 return frame_type - 63; }
329 static u1 offset_delta_to_frame_type(int offset_delta) {
330 return (u1)(offset_delta + 63); }
331
332 public:
333 static bool is_frame_type(u1 tag) {
334 return tag >= 64 && tag < 128;
335 }
336
337 static same_locals_1_stack_item_frame* at(address addr) {
338 assert(is_frame_type(*addr), "Wrong frame id");
339 return (same_locals_1_stack_item_frame*)addr;
340 }
341
342 static same_locals_1_stack_item_frame* create_at(
343 address addr, int offset_delta, verification_type_info* vti) {
344 same_locals_1_stack_item_frame* sm = (same_locals_1_stack_item_frame*)addr;
345 sm->set_offset_delta(offset_delta);
346 if (vti != NULL) {
347 sm->set_type(vti);
348 }
349 return sm;
350 }
351
352 static size_t calculate_size(verification_type_info* vti) {
353 return sizeof(u1) + vti->size();
354 }
355
356 static size_t max_size() {
357 return sizeof(u1) + verification_type_info::max_size();
358 }
359
360 size_t size() const { return calculate_size(types()); }
361 int offset_delta() const { return frame_type_to_offset_delta(frame_type()); }
362
363 void set_offset_delta(int offset_delta) {
364 assert(offset_delta > 0 && offset_delta <= 64,
365 "Offset too large for this frame type");
366 set_frame_type(offset_delta_to_frame_type(offset_delta));
367 }
368
369 void set_type(verification_type_info* vti) {
370 verification_type_info* cur = types();
371 cur->copy_from(vti);
372 }
373
374 int number_of_types() const { return 1; }
375 verification_type_info* types() const {
376 return verification_type_info::at(type_addr());
377 }
378
379 bool is_valid_offset(int offset_delta) const {
380 return is_frame_type(offset_delta_to_frame_type(offset_delta));
381 }
382
383 bool verify_subtype(address start, address end) const {
384 return types()->verify(start, end);
385 }
386
387 void print_on(outputStream* st, int current_offset = -1) const {
388 st->print("same_locals_1_stack_item_frame(@%d,",
389 offset_delta() + current_offset);
390 types()->print_on(st);
391 st->print(")");
392 }
393
394 void print_truncated(outputStream* st, int current_offset = -1) const {
395 st->print("same_locals_1_stack_item_frame(@%d), output truncated, Stackmap exceeds table size.",
396 offset_delta() + current_offset);
397 }
398 };
399
400 class same_locals_1_stack_item_extended : public stack_map_frame {
401 private:
402 address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }
403 address type_addr() const { return offset_delta_addr() + sizeof(u2); }
404
405 enum { _frame_id = 247 };
406
407 public:
408 static bool is_frame_type(u1 tag) {
409 return tag == _frame_id;
410 }
411
412 static same_locals_1_stack_item_extended* at(address addr) {
413 assert(is_frame_type(*addr), "Wrong frame id");
414 return (same_locals_1_stack_item_extended*)addr;
415 }
416
417 static same_locals_1_stack_item_extended* create_at(
418 address addr, int offset_delta, verification_type_info* vti) {
419 same_locals_1_stack_item_extended* sm =
420 (same_locals_1_stack_item_extended*)addr;
421 sm->set_frame_type(_frame_id);
422 sm->set_offset_delta(offset_delta);
423 if (vti != NULL) {
424 sm->set_type(vti);
425 }
426 return sm;
427 }
428
429 static size_t calculate_size(verification_type_info* vti) {
430 return sizeof(u1) + sizeof(u2) + vti->size();
431 }
432
433 size_t size() const { return calculate_size(types()); }
434 int offset_delta() const {
435 return Bytes::get_Java_u2(offset_delta_addr()) + 1;
436 }
437
438 void set_offset_delta(int offset_delta) {
439 Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);
440 }
441
442 void set_type(verification_type_info* vti) {
443 verification_type_info* cur = types();
444 cur->copy_from(vti);
445 }
446
447 int number_of_types() const { return 1; }
448 verification_type_info* types() const {
449 return verification_type_info::at(type_addr());
450 }
451 bool is_valid_offset(int offset) { return true; }
452
453 bool verify_subtype(address start, address end) const {
454 return type_addr() < end && types()->verify(start, end);
455 }
456
457 void print_on(outputStream* st, int current_offset = -1) const {
458 st->print("same_locals_1_stack_item_extended(@%d,",
459 offset_delta() + current_offset);
460 types()->print_on(st);
461 st->print(")");
462 }
463
464 void print_truncated(outputStream* st, int current_offset = -1) const {
465 st->print("same_locals_1_stack_item_extended(@%d), output truncated, Stackmap exceeds table size.",
466 offset_delta() + current_offset);
467 }
468 };
469
470 class chop_frame : public stack_map_frame {
471 private:
472 address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }
473
474 static int frame_type_to_chops(u1 frame_type) {
475 int chop = 251 - frame_type;
476 return chop;
477 }
478
479 static u1 chops_to_frame_type(int chop) {
480 return 251 - chop;
481 }
482
483 public:
484 static bool is_frame_type(u1 tag) {
485 return frame_type_to_chops(tag) > 0 && frame_type_to_chops(tag) < 4;
486 }
487
488 static chop_frame* at(address addr) {
489 assert(is_frame_type(*addr), "Wrong frame id");
490 return (chop_frame*)addr;
491 }
492
493 static chop_frame* create_at(address addr, int offset_delta, int chops) {
494 chop_frame* sm = (chop_frame*)addr;
495 sm->set_chops(chops);
496 sm->set_offset_delta(offset_delta);
497 return sm;
498 }
499
500 static size_t calculate_size() {
501 return sizeof(u1) + sizeof(u2);
502 }
503
504 size_t size() const { return calculate_size(); }
505 int offset_delta() const {
506 return Bytes::get_Java_u2(offset_delta_addr()) + 1;
507 }
508 void set_offset_delta(int offset_delta) {
509 Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);
510 }
511
512 int chops() const {
513 int chops = frame_type_to_chops(frame_type());
514 assert(chops > 0 && chops < 4, "Invalid number of chops in frame");
515 return chops;
516 }
517 void set_chops(int chops) {
518 assert(chops > 0 && chops <= 3, "Bad number of chops");
519 set_frame_type(chops_to_frame_type(chops));
520 }
521
522 int number_of_types() const { return 0; }
523 verification_type_info* types() const { return NULL; }
524 bool is_valid_offset(int offset) { return true; }
525
526 bool verify_subtype(address start, address end) const {
527 return frame_type_addr() + size() <= end;
528 }
529
530 void print_on(outputStream* st, int current_offset = -1) const {
531 st->print("chop_frame(@%d,%d)", offset_delta() + current_offset, chops());
532 }
533
534 void print_truncated(outputStream* st, int current_offset = -1) const {
535 print_on(st, current_offset);
536 }
537 };
538
539 class append_frame : public stack_map_frame {
540 private:
541 address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }
542 address types_addr() const { return offset_delta_addr() + sizeof(u2); }
543
544 static int frame_type_to_appends(u1 frame_type) {
545 int append = frame_type - 251;
546 return append;
547 }
548
549 static u1 appends_to_frame_type(int appends) {
550 assert(appends > 0 && appends < 4, "Invalid append amount");
551 return 251 + appends;
552 }
553
554 public:
555 static bool is_frame_type(u1 tag) {
556 return frame_type_to_appends(tag) > 0 && frame_type_to_appends(tag) < 4;
557 }
558
559 static append_frame* at(address addr) {
560 assert(is_frame_type(*addr), "Wrong frame id");
561 return (append_frame*)addr;
562 }
563
564 static append_frame* create_at(
565 address addr, int offset_delta, int appends,
566 verification_type_info* types) {
567 append_frame* sm = (append_frame*)addr;
568 sm->set_appends(appends);
569 sm->set_offset_delta(offset_delta);
570 if (types != NULL) {
571 verification_type_info* cur = sm->types();
572 for (int i = 0; i < appends; ++i) {
573 cur->copy_from(types);
574 cur = cur->next();
575 types = types->next();
576 }
577 }
578 return sm;
579 }
580
581 static size_t calculate_size(int appends, verification_type_info* types) {
582 size_t sz = sizeof(u1) + sizeof(u2);
583 for (int i = 0; i < appends; ++i) {
584 sz += types->size();
585 types = types->next();
586 }
587 return sz;
588 }
589
590 static size_t max_size() {
591 return sizeof(u1) + sizeof(u2) + 3 * verification_type_info::max_size();
592 }
593
594 size_t size() const { return calculate_size(number_of_types(), types()); }
595 int offset_delta() const {
596 return Bytes::get_Java_u2(offset_delta_addr()) + 1;
597 }
598
599 void set_offset_delta(int offset_delta) {
600 Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);
601 }
602
603 void set_appends(int appends) {
604 assert(appends > 0 && appends < 4, "Bad number of appends");
605 set_frame_type(appends_to_frame_type(appends));
606 }
607
608 int number_of_types() const {
609 int appends = frame_type_to_appends(frame_type());
610 assert(appends > 0 && appends < 4, "Invalid number of appends in frame");
611 return appends;
612 }
613 verification_type_info* types() const {
614 return verification_type_info::at(types_addr());
615 }
616 bool is_valid_offset(int offset) const { return true; }
617
618 bool verify_subtype(address start, address end) const {
619 verification_type_info* vti = types();
620 if ((address)vti < end && vti->verify(start, end)) {
621 int nof = number_of_types();
622 vti = vti->next();
623 if (nof < 2 || vti->verify(start, end)) {
624 vti = vti->next();
625 if (nof < 3 || vti->verify(start, end)) {
626 return true;
627 }
628 }
629 }
630 return false;
631 }
632
633 void print_on(outputStream* st, int current_offset = -1) const {
634 st->print("append_frame(@%d,", offset_delta() + current_offset);
635 verification_type_info* vti = types();
636 for (int i = 0; i < number_of_types(); ++i) {
637 vti->print_on(st);
638 if (i != number_of_types() - 1) {
639 st->print(",");
640 }
641 vti = vti->next();
642 }
643 st->print(")");
644 }
645
646 void print_truncated(outputStream* st, int current_offset = -1) const {
647 st->print("append_frame(@%d), output truncated, Stackmap exceeds table size.",
648 offset_delta() + current_offset);
649 }
650 };
651
652 class full_frame : public stack_map_frame {
653 private:
654 address offset_delta_addr() const { return frame_type_addr() + sizeof(u1); }
655 address num_locals_addr() const { return offset_delta_addr() + sizeof(u2); }
656 address locals_addr() const { return num_locals_addr() + sizeof(u2); }
657 address stack_slots_addr(address end_of_locals) const {
658 return end_of_locals; }
659 address stack_addr(address end_of_locals) const {
660 return stack_slots_addr(end_of_locals) + sizeof(u2); }
661
662 enum { _frame_id = 255 };
663
664 public:
665 static bool is_frame_type(u1 tag) {
666 return tag == _frame_id;
667 }
668
669 static full_frame* at(address addr) {
670 assert(is_frame_type(*addr), "Wrong frame id");
671 return (full_frame*)addr;
672 }
673
674 static full_frame* create_at(
675 address addr, int offset_delta, int num_locals,
676 verification_type_info* locals,
677 int stack_slots, verification_type_info* stack) {
678 full_frame* sm = (full_frame*)addr;
679 sm->set_frame_type(_frame_id);
680 sm->set_offset_delta(offset_delta);
681 sm->set_num_locals(num_locals);
682 if (locals != NULL) {
683 verification_type_info* cur = sm->locals();
684 for (int i = 0; i < num_locals; ++i) {
685 cur->copy_from(locals);
686 cur = cur->next();
687 locals = locals->next();
688 }
689 address end_of_locals = (address)cur;
690 sm->set_stack_slots(end_of_locals, stack_slots);
691 cur = sm->stack(end_of_locals);
692 for (int i = 0; i < stack_slots; ++i) {
693 cur->copy_from(stack);
694 cur = cur->next();
695 stack = stack->next();
696 }
697 }
698 return sm;
699 }
700
701 static size_t calculate_size(
702 int num_locals, verification_type_info* locals,
703 int stack_slots, verification_type_info* stack) {
704 size_t sz = sizeof(u1) + sizeof(u2) + sizeof(u2) + sizeof(u2);
705 verification_type_info* vti = locals;
706 for (int i = 0; i < num_locals; ++i) {
707 sz += vti->size();
708 vti = vti->next();
709 }
710 vti = stack;
711 for (int i = 0; i < stack_slots; ++i) {
712 sz += vti->size();
713 vti = vti->next();
714 }
715 return sz;
716 }
717
718 static size_t max_size(int locals, int stack) {
719 return sizeof(u1) + 3 * sizeof(u2) +
720 (locals + stack) * verification_type_info::max_size();
721 }
722
723 size_t size() const {
724 address eol = end_of_locals();
725 return calculate_size(num_locals(), locals(), stack_slots(eol), stack(eol));
726 }
727
728 int offset_delta() const {
729 return Bytes::get_Java_u2(offset_delta_addr()) + 1;
730 }
731 int num_locals() const { return Bytes::get_Java_u2(num_locals_addr()); }
732 verification_type_info* locals() const {
733 return verification_type_info::at(locals_addr());
734 }
735 address end_of_locals() const {
736 verification_type_info* vti = locals();
737 for (int i = 0; i < num_locals(); ++i) {
738 vti = vti->next();
739 }
740 return (address)vti;
741 }
742 int stack_slots(address end_of_locals) const {
743 return Bytes::get_Java_u2(stack_slots_addr(end_of_locals));
744 }
745 verification_type_info* stack(address end_of_locals) const {
746 return verification_type_info::at(stack_addr(end_of_locals));
747 }
748
749 void set_offset_delta(int offset_delta) {
750 Bytes::put_Java_u2(offset_delta_addr(), offset_delta - 1);
751 }
752 void set_num_locals(int num_locals) {
753 Bytes::put_Java_u2(num_locals_addr(), num_locals);
754 }
755 void set_stack_slots(address end_of_locals, int stack_slots) {
756 Bytes::put_Java_u2(stack_slots_addr(end_of_locals), stack_slots);
757 }
758
759 // These return only the locals. Extra processing is required for stack
760 // types of full frames.
761 int number_of_types() const { return num_locals(); }
762 verification_type_info* types() const { return locals(); }
763 bool is_valid_offset(int offset) { return true; }
764
765 bool verify_subtype(address start, address end) const {
766 verification_type_info* vti = types();
767 if ((address)vti >= end) {
768 return false;
769 }
770 int count = number_of_types();
771 for (int i = 0; i < count; ++i) {
772 if (!vti->verify(start, end)) {
773 return false;
774 }
775 vti = vti->next();
776 }
777 address eol = (address)vti;
778 if (eol + sizeof(u2) > end) {
779 return false;
780 }
781 count = stack_slots(eol);
782 vti = stack(eol);
783 for (int i = 0; i < stack_slots(eol); ++i) {
784 if (!vti->verify(start, end)) {
785 return false;
786 }
787 vti = vti->next();
788 }
789 return true;
790 }
791
792 void print_on(outputStream* st, int current_offset = -1) const {
793 st->print("full_frame(@%d,{", offset_delta() + current_offset);
794 verification_type_info* vti = locals();
795 for (int i = 0; i < num_locals(); ++i) {
796 vti->print_on(st);
797 if (i != num_locals() - 1) {
798 st->print(",");
799 }
800 vti = vti->next();
801 }
802 st->print("},{");
803 address end_of_locals = (address)vti;
804 vti = stack(end_of_locals);
805 int ss = stack_slots(end_of_locals);
806 for (int i = 0; i < ss; ++i) {
807 vti->print_on(st);
808 if (i != ss - 1) {
809 st->print(",");
810 }
811 vti = vti->next();
812 }
813 st->print("})");
814 }
815
816 void print_truncated(outputStream* st, int current_offset = -1) const {
817 st->print("full_frame(@%d), output truncated, Stackmap exceeds table size.",
818 offset_delta() + current_offset);
819 }
820 };
821
822 #define VIRTUAL_DISPATCH(stack_frame_type, func_name, args) \
823 stack_frame_type* item_##stack_frame_type = as_##stack_frame_type(); \
824 if (item_##stack_frame_type != NULL) { \
825 return item_##stack_frame_type->func_name args; \
826 }
827
828 #define VOID_VIRTUAL_DISPATCH(stack_frame_type, func_name, args) \
829 stack_frame_type* item_##stack_frame_type = as_##stack_frame_type(); \
830 if (item_##stack_frame_type != NULL) { \
831 item_##stack_frame_type->func_name args; \
832 return; \
833 }
834
835 size_t stack_map_frame::size() const {
836 FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, size, ());
837 return 0;
838 }
839
840 int stack_map_frame::offset_delta() const {
841 FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, offset_delta, ());
842 return 0;
843 }
844
845 void stack_map_frame::set_offset_delta(int offset_delta) {
846 FOR_EACH_STACKMAP_FRAME_TYPE(
847 VOID_VIRTUAL_DISPATCH, set_offset_delta, (offset_delta));
848 }
849
850 int stack_map_frame::number_of_types() const {
851 FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, number_of_types, ());
852 return 0;
853 }
854
855 verification_type_info* stack_map_frame::types() const {
856 FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, types, ());
857 return NULL;
858 }
859
860 bool stack_map_frame::is_valid_offset(int offset) const {
861 FOR_EACH_STACKMAP_FRAME_TYPE(VIRTUAL_DISPATCH, is_valid_offset, (offset));
862 return true;
863 }
864
865 bool stack_map_frame::verify(address start, address end) const {
866 if (frame_type_addr() >= start && frame_type_addr() < end) {
867 FOR_EACH_STACKMAP_FRAME_TYPE(
868 VIRTUAL_DISPATCH, verify_subtype, (start, end));
869 }
870 return false;
871 }
872
873 void stack_map_frame::print_on(outputStream* st, int offs = -1) const {
874 FOR_EACH_STACKMAP_FRAME_TYPE(VOID_VIRTUAL_DISPATCH, print_on, (st, offs));
875 }
876
877 void stack_map_frame::print_truncated(outputStream* st, int offs = -1) const {
878 FOR_EACH_STACKMAP_FRAME_TYPE(VOID_VIRTUAL_DISPATCH, print_truncated, (st, offs));
879 }
880
881 #undef VIRTUAL_DISPATCH
882 #undef VOID_VIRTUAL_DISPATCH
883
884 #define AS_SUBTYPE_DEF(stack_frame_type, arg1, arg2) \
885 stack_frame_type* stack_map_frame::as_##stack_frame_type() const { \
886 if (stack_frame_type::is_frame_type(frame_type())) { \
887 return (stack_frame_type*)this; \
888 } else { \
889 return NULL; \
890 } \
891 }
892
893 FOR_EACH_STACKMAP_FRAME_TYPE(AS_SUBTYPE_DEF, x, x)
894 #undef AS_SUBTYPE_DEF
895
896 class stack_map_table {
897 private:
898 address number_of_entries_addr() const {
899 return (address)this;
900 }
901 address entries_addr() const {
902 return number_of_entries_addr() + sizeof(u2);
903 }
904
905 protected:
906 // No constructors - should be 'private', but GCC issues a warning if it is
907 stack_map_table() {}
908 stack_map_table(const stack_map_table&) {}
909
910 public:
911
912 static stack_map_table* at(address addr) {
913 return (stack_map_table*)addr;
914 }
915
916 u2 number_of_entries() const {
917 return Bytes::get_Java_u2(number_of_entries_addr());
918 }
919 stack_map_frame* entries() const {
920 return stack_map_frame::at(entries_addr());
921 }
922
923 void set_number_of_entries(u2 num) {
924 Bytes::put_Java_u2(number_of_entries_addr(), num);
925 }
926 };
927
928 class stack_map_table_attribute {
929 private:
930 address name_index_addr() const {
931 return (address)this; }
932 address attribute_length_addr() const {
933 return name_index_addr() + sizeof(u2); }
934 address stack_map_table_addr() const {
935 return attribute_length_addr() + sizeof(u4); }
936
937 protected:
938 // No constructors - should be 'private', but GCC issues a warning if it is
939 stack_map_table_attribute() {}
940 stack_map_table_attribute(const stack_map_table_attribute&) {}
941
942 public:
943
944 static stack_map_table_attribute* at(address addr) {
945 return (stack_map_table_attribute*)addr;
946 }
947
948 u2 name_index() const {
949 return Bytes::get_Java_u2(name_index_addr()); }
950 u4 attribute_length() const {
951 return Bytes::get_Java_u4(attribute_length_addr()); }
952 stack_map_table* table() const {
953 return stack_map_table::at(stack_map_table_addr());
954 }
955
956 void set_name_index(u2 idx) {
957 Bytes::put_Java_u2(name_index_addr(), idx);
958 }
959 void set_attribute_length(u4 len) {
960 Bytes::put_Java_u4(attribute_length_addr(), len);
961 }
962 };
963
964 #undef FOR_EACH_STACKMAP_FRAME_TYPE
965
966 #endif // SHARE_VM_CLASSFILE_STACKMAPTABLEFORMAT_HPP