1 /*
2 * Copyright (c) 2003, 2024, 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 "interpreter/interpreter.hpp"
27 #include "memory/metadataFactory.hpp"
28 #include "memory/metaspaceClosure.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/method.hpp"
32 #include "runtime/safepointVerifiers.hpp"
33 #include "runtime/signature.hpp"
34 #include "utilities/align.hpp"
35 #include "utilities/checkedCast.hpp"
36
37 // Static initialization
38 const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
39 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
40
41 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
42 int byte_code_size,
43 InlineTableSizes* sizes,
44 MethodType method_type,
45 TRAPS) {
46 int size = ConstMethod::size(byte_code_size, sizes);
47 return new (loader_data, size, MetaspaceObj::ConstMethodType, THREAD) ConstMethod(
48 byte_code_size, sizes, method_type, size);
49 }
50
51 ConstMethod::ConstMethod(int byte_code_size,
52 InlineTableSizes* sizes,
53 MethodType method_type,
54 int size) {
55
56 NoSafepointVerifier no_safepoint;
57 init_fingerprint();
58 set_constants(nullptr);
59 set_stackmap_data(nullptr);
60 set_code_size(byte_code_size);
61 set_constMethod_size(size);
62 set_inlined_tables_length(sizes); // sets _flags
63 set_method_type(method_type);
64 assert(this->size() == size, "wrong size for object");
65 set_name_index(0);
66 set_signature_index(0);
67 set_constants(nullptr);
68 set_max_stack(0);
69 set_max_locals(0);
70 set_method_idnum(0);
71 set_size_of_parameters(0);
72 set_result_type((BasicType)0);
73 }
74
75 // Derive size of parameters, return type, and fingerprint,
76 // all in one pass, which is run at load time.
77 // We need the first two, and might as well grab the third.
78 void ConstMethod::compute_from_signature(Symbol* sig, bool is_static) {
79 // At this point, since we are scanning the signature,
80 // we might as well compute the whole fingerprint.
81 Fingerprinter fp(sig, is_static);
82 set_size_of_parameters(fp.size_of_parameters());
83 set_num_stack_arg_slots(fp.num_stack_arg_slots());
84 set_result_type(fp.return_type());
85 set_fingerprint(fp.fingerprint());
86 }
87
88
89 // Accessor that copies to metadata.
90 void ConstMethod::copy_stackmap_data(ClassLoaderData* loader_data,
91 u1* sd, int length, TRAPS) {
92 _stackmap_data = MetadataFactory::new_array<u1>(loader_data, length, CHECK);
93 memcpy((void*)_stackmap_data->adr_at(0), (void*)sd, length);
94 }
95
96 // Deallocate metadata fields associated with ConstMethod*
97 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
98 if (stackmap_data() != nullptr) {
99 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
100 }
101 set_stackmap_data(nullptr);
102
103 // deallocate annotation arrays
104 if (has_method_annotations())
105 MetadataFactory::free_array<u1>(loader_data, method_annotations());
106 if (has_parameter_annotations())
107 MetadataFactory::free_array<u1>(loader_data, parameter_annotations());
108 if (has_type_annotations())
109 MetadataFactory::free_array<u1>(loader_data, type_annotations());
110 if (has_default_annotations())
111 MetadataFactory::free_array<u1>(loader_data, default_annotations());
112 }
113
114 // How big must this constMethodObject be?
115
116 int ConstMethod::size(int code_size,
117 InlineTableSizes* sizes) {
118 int extra_bytes = code_size;
119 if (sizes->compressed_linenumber_size() > 0) {
120 extra_bytes += sizes->compressed_linenumber_size();
121 }
122 if (sizes->checked_exceptions_length() > 0) {
123 extra_bytes += sizeof(u2);
124 extra_bytes += sizes->checked_exceptions_length() * (int)sizeof(CheckedExceptionElement);
125 }
126 if (sizes->localvariable_table_length() > 0) {
127 extra_bytes += sizeof(u2);
128 extra_bytes +=
129 sizes->localvariable_table_length() * (int)sizeof(LocalVariableTableElement);
130 }
131 if (sizes->exception_table_length() > 0) {
132 extra_bytes += sizeof(u2);
133 extra_bytes += sizes->exception_table_length() * (int)sizeof(ExceptionTableElement);
134 }
135 if (sizes->generic_signature_index() != 0) {
136 extra_bytes += sizeof(u2);
137 }
138 // This has to be a less-than-or-equal check, because we might be
139 // storing information from a zero-length MethodParameters
140 // attribute. We have to store these, because in some cases, they
141 // cause the reflection API to throw a MalformedParametersException.
142 if (sizes->method_parameters_length() >= 0) {
143 extra_bytes += sizeof(u2);
144 extra_bytes += sizes->method_parameters_length() * (int)sizeof(MethodParametersElement);
145 }
146
147 // Align sizes up to a word.
148 extra_bytes = align_up(extra_bytes, BytesPerWord);
149
150 // One pointer per annotation array
151 if (sizes->method_annotations_length() > 0) {
152 extra_bytes += (int)sizeof(AnnotationArray*);
153 }
154 if (sizes->parameter_annotations_length() > 0) {
155 extra_bytes += (int)sizeof(AnnotationArray*);
156 }
157 if (sizes->type_annotations_length() > 0) {
158 extra_bytes += (int)sizeof(AnnotationArray*);
159 }
160 if (sizes->default_annotations_length() > 0) {
161 extra_bytes += (int)sizeof(AnnotationArray*);
162 }
163
164 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord;
165 assert(extra_words == extra_bytes/BytesPerWord, "should already be aligned");
166 return align_metadata_size(header_size() + extra_words);
167 }
168
169 Method* ConstMethod::method() const {
170 return _constants->pool_holder()->method_with_idnum(_method_idnum);
171 }
172
173 // linenumber table - note that length is unknown until decompression,
174 // see class CompressedLineNumberReadStream.
175
176 u_char* ConstMethod::compressed_linenumber_table() const {
177 // Located immediately following the bytecodes.
178 assert(has_linenumber_table(), "called only if table is present");
179 return code_end();
180 }
181
182 // Last short in ConstMethod* before annotations
183 u2* ConstMethod::last_u2_element() const {
184 int offset = 0;
185 if (has_method_annotations()) offset++;
186 if (has_parameter_annotations()) offset++;
187 if (has_type_annotations()) offset++;
188 if (has_default_annotations()) offset++;
189 return (u2*)((AnnotationArray**)constMethod_end() - offset) - 1;
190 }
191
192 u2* ConstMethod::generic_signature_index_addr() const {
193 // Located at the end of the constMethod.
194 assert(has_generic_signature(), "called only if generic signature exists");
195 return last_u2_element();
196 }
197
198 u2* ConstMethod::method_parameters_length_addr() const {
199 assert(has_method_parameters(), "called only if table is present");
200 return has_generic_signature() ? (last_u2_element() - 1) :
201 last_u2_element();
202 }
203
204 u2* ConstMethod::checked_exceptions_length_addr() const {
205 // Located immediately before the generic signature index.
206 assert(has_checked_exceptions(), "called only if table is present");
207 if(has_method_parameters()) {
208 // If method parameters present, locate immediately before them.
209 return (u2*)method_parameters_start() - 1;
210 } else {
211 // Else, the exception table is at the end of the constMethod.
212 return has_generic_signature() ? (last_u2_element() - 1) :
213 last_u2_element();
214 }
215 }
216
217 u2* ConstMethod::exception_table_length_addr() const {
218 assert(has_exception_table(), "called only if table is present");
219 if (has_checked_exceptions()) {
220 // If checked_exception present, locate immediately before them.
221 return (u2*) checked_exceptions_start() - 1;
222 } else {
223 if(has_method_parameters()) {
224 // If method parameters present, locate immediately before them.
225 return (u2*)method_parameters_start() - 1;
226 } else {
227 // Else, the exception table is at the end of the constMethod.
228 return has_generic_signature() ? (last_u2_element() - 1) :
229 last_u2_element();
230 }
231 }
232 }
233
234 u2* ConstMethod::localvariable_table_length_addr() const {
235 assert(has_localvariable_table(), "called only if table is present");
236 if (has_exception_table()) {
237 // If exception_table present, locate immediately before them.
238 return (u2*) exception_table_start() - 1;
239 } else {
240 if (has_checked_exceptions()) {
241 // If checked_exception present, locate immediately before them.
242 return (u2*) checked_exceptions_start() - 1;
243 } else {
244 if(has_method_parameters()) {
245 // If method parameters present, locate immediately before them.
246 return (u2*)method_parameters_start() - 1;
247 } else {
248 // Else, the exception table is at the end of the constMethod.
249 return has_generic_signature() ? (last_u2_element() - 1) :
250 last_u2_element();
251 }
252 }
253 }
254 }
255
256 // Update the flags to indicate the presence of these optional fields.
257 void ConstMethod::set_inlined_tables_length(InlineTableSizes* sizes) {
258 if (sizes->compressed_linenumber_size() > 0)
259 set_has_linenumber_table();
260 if (sizes->generic_signature_index() != 0)
261 set_has_generic_signature();
262 if (sizes->method_parameters_length() >= 0)
263 set_has_method_parameters();
264 if (sizes->checked_exceptions_length() > 0)
265 set_has_checked_exceptions();
266 if (sizes->exception_table_length() > 0)
267 set_has_exception_table();
268 if (sizes->localvariable_table_length() > 0)
269 set_has_localvariable_table();
270
271 // annotations, they are all pointer sized embedded objects so don't have
272 // a length embedded also.
273 if (sizes->method_annotations_length() > 0)
274 set_has_method_annotations();
275 if (sizes->parameter_annotations_length() > 0)
276 set_has_parameter_annotations();
277 if (sizes->type_annotations_length() > 0)
278 set_has_type_annotations();
279 if (sizes->default_annotations_length() > 0)
280 set_has_default_annotations();
281
282 // This code is extremely brittle and should possibly be revised.
283 // The *_length_addr functions walk backwards through the
284 // constMethod data, using each of the length indexes ahead of them,
285 // as well as the flags variable. Therefore, the indexes must be
286 // initialized in reverse order, or else they will compute the wrong
287 // offsets. Moving the initialization of _flags into a separate
288 // block solves *half* of the problem, but the following part will
289 // still break if the order is not exactly right.
290 //
291 // Also, the servicability agent needs to be informed anytime
292 // anything is added here. It might be advisable to have some sort
293 // of indication of this inline.
294 if (sizes->generic_signature_index() != 0)
295 *(generic_signature_index_addr()) = checked_cast<u2>(sizes->generic_signature_index());
296 // New data should probably go here.
297 if (sizes->method_parameters_length() >= 0)
298 *(method_parameters_length_addr()) = checked_cast<u2>(sizes->method_parameters_length());
299 if (sizes->checked_exceptions_length() > 0)
300 *(checked_exceptions_length_addr()) = checked_cast<u2>(sizes->checked_exceptions_length());
301 if (sizes->exception_table_length() > 0)
302 *(exception_table_length_addr()) = checked_cast<u2>(sizes->exception_table_length());
303 if (sizes->localvariable_table_length() > 0)
304 *(localvariable_table_length_addr()) = checked_cast<u2>(sizes->localvariable_table_length());
305 }
306
307 int ConstMethod::method_parameters_length() const {
308 return has_method_parameters() ? *(method_parameters_length_addr()) : -1;
309 }
310
311 MethodParametersElement* ConstMethod::method_parameters_start() const {
312 u2* addr = method_parameters_length_addr();
313 u2 length = *addr;
314 addr -= length * sizeof(MethodParametersElement) / sizeof(u2);
315 return (MethodParametersElement*) addr;
316 }
317
318
319 u2 ConstMethod::checked_exceptions_length() const {
320 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
321 }
322
323
324 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
325 u2* addr = checked_exceptions_length_addr();
326 u2 length = *addr;
327 assert(length > 0, "should only be called if table is present");
328 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
329 return (CheckedExceptionElement*) addr;
330 }
331
332
333 u2 ConstMethod::localvariable_table_length() const {
334 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
335 }
336
337
338 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
339 u2* addr = localvariable_table_length_addr();
340 u2 length = *addr;
341 assert(length > 0, "should only be called if table is present");
342 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
343 return (LocalVariableTableElement*) addr;
344 }
345
346 u2 ConstMethod::exception_table_length() const {
347 return has_exception_table() ? *(exception_table_length_addr()) : 0;
348 }
349
350 ExceptionTableElement* ConstMethod::exception_table_start() const {
351 u2* addr = exception_table_length_addr();
352 u2 length = *addr;
353 assert(length > 0, "should only be called if table is present");
354 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
355 return (ExceptionTableElement*)addr;
356 }
357
358 AnnotationArray** ConstMethod::method_annotations_addr() const {
359 assert(has_method_annotations(), "should only be called if method annotations are present");
360 return (AnnotationArray**)constMethod_end() - 1;
361 }
362
363 AnnotationArray** ConstMethod::parameter_annotations_addr() const {
364 assert(has_parameter_annotations(), "should only be called if method parameter annotations are present");
365 int offset = 1;
366 if (has_method_annotations()) offset++;
367 return (AnnotationArray**)constMethod_end() - offset;
368 }
369
370 AnnotationArray** ConstMethod::type_annotations_addr() const {
371 assert(has_type_annotations(), "should only be called if method type annotations are present");
372 int offset = 1;
373 if (has_method_annotations()) offset++;
374 if (has_parameter_annotations()) offset++;
375 return (AnnotationArray**)constMethod_end() - offset;
376 }
377
378 AnnotationArray** ConstMethod::default_annotations_addr() const {
379 assert(has_default_annotations(), "should only be called if method default annotations are present");
380 int offset = 1;
381 if (has_method_annotations()) offset++;
382 if (has_parameter_annotations()) offset++;
383 if (has_type_annotations()) offset++;
384 return (AnnotationArray**)constMethod_end() - offset;
385 }
386
387 static Array<u1>* copy_annotations(ClassLoaderData* loader_data, AnnotationArray* from, TRAPS) {
388 int length = from->length();
389 Array<u1>* a = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL);
390 memcpy((void*)a->adr_at(0), (void*)from->adr_at(0), length);
391 return a;
392 }
393
394 // copy annotations from 'cm' to 'this'
395 // Must make copy because these are deallocated with their constMethod, if redefined.
396 void ConstMethod::copy_annotations_from(ClassLoaderData* loader_data, ConstMethod* cm, TRAPS) {
397 Array<u1>* a;
398 if (cm->has_method_annotations()) {
399 assert(has_method_annotations(), "should be allocated already");
400 a = copy_annotations(loader_data, cm->method_annotations(), CHECK);
401 set_method_annotations(a);
402 }
403 if (cm->has_parameter_annotations()) {
404 assert(has_parameter_annotations(), "should be allocated already");
405 a = copy_annotations(loader_data, cm->parameter_annotations(), CHECK);
406 set_parameter_annotations(a);
407 }
408 if (cm->has_type_annotations()) {
409 assert(has_type_annotations(), "should be allocated already");
410 a = copy_annotations(loader_data, cm->type_annotations(), CHECK);
411 set_type_annotations(a);
412 }
413 if (cm->has_default_annotations()) {
414 assert(has_default_annotations(), "should be allocated already");
415 a = copy_annotations(loader_data, cm->default_annotations(), CHECK);
416 set_default_annotations(a);
417 }
418 }
419
420 void ConstMethod::metaspace_pointers_do(MetaspaceClosure* it) {
421 log_trace(cds)("Iter(ConstMethod): %p", this);
422
423 if (constants()->pool_holder() != nullptr && !method()->method_holder()->is_rewritten()) {
424 // holder is null for MH intrinsic methods
425 it->push(&_constants, MetaspaceClosure::_writable);
426 } else {
427 it->push(&_constants);
428 }
429 it->push(&_stackmap_data);
430 if (has_method_annotations()) {
431 it->push(method_annotations_addr());
432 }
433 if (has_parameter_annotations()) {
434 it->push(parameter_annotations_addr());
435 }
436 if (has_type_annotations()) {
437 it->push(type_annotations_addr());
438 }
439 if (has_default_annotations()) {
440 it->push(default_annotations_addr());
441 }
442 }
443
444 // Printing
445
446 void ConstMethod::print_on(outputStream* st) const {
447 ResourceMark rm;
448 st->print_cr("%s", internal_name());
449 Method* m = method();
450 st->print(" - method: " PTR_FORMAT " ", p2i(m));
451 if (m != nullptr) {
452 m->print_value_on(st);
453 }
454 st->cr();
455 st->print(" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr();
456 if (has_stackmap_table()) {
457 st->print(" - stackmap data: ");
458 stackmap_data()->print_value_on(st);
459 st->cr();
460 }
461 }
462
463 // Short version of printing ConstMethod* - just print the name of the
464 // method it belongs to.
465 void ConstMethod::print_value_on(outputStream* st) const {
466 st->print(" const part of method " );
467 Method* m = method();
468 if (m != nullptr) {
469 m->print_value_on(st);
470 } else {
471 st->print("null");
472 }
473 }
474
475 // Verification
476
477 void ConstMethod::verify_on(outputStream* st) {
478 // Verification can occur during oop construction before the method or
479 // other fields have been initialized.
480 guarantee(method() != nullptr && method()->is_method(), "should be method");
481
482 address m_end = (address)((intptr_t) this + size());
483 address compressed_table_start = code_end();
484 guarantee(compressed_table_start <= m_end, "invalid method layout");
485 address compressed_table_end = compressed_table_start;
486 // Verify line number table
487 if (has_linenumber_table()) {
488 CompressedLineNumberReadStream stream(compressed_linenumber_table());
489 while (stream.read_pair()) {
490 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
491 }
492 compressed_table_end += stream.position();
493 }
494 guarantee(compressed_table_end <= m_end, "invalid method layout");
495 // Verify checked exceptions, exception table and local variable tables
496 if (has_method_parameters()) {
497 u2* addr = method_parameters_length_addr();
498 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
499 }
500 if (has_checked_exceptions()) {
501 u2* addr = checked_exceptions_length_addr();
502 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
503 }
504 if (has_exception_table()) {
505 u2* addr = exception_table_length_addr();
506 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
507 }
508 if (has_localvariable_table()) {
509 u2* addr = localvariable_table_length_addr();
510 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
511 }
512 // Check compressed_table_end relative to uncompressed_table_start
513 u2* uncompressed_table_start;
514 if (has_localvariable_table()) {
515 uncompressed_table_start = (u2*) localvariable_table_start();
516 } else if (has_exception_table()) {
517 uncompressed_table_start = (u2*) exception_table_start();
518 } else if (has_checked_exceptions()) {
519 uncompressed_table_start = (u2*) checked_exceptions_start();
520 } else if (has_method_parameters()) {
521 uncompressed_table_start = (u2*) method_parameters_start();
522 } else {
523 uncompressed_table_start = (u2*) m_end;
524 }
525 int gap = int((intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end);
526 int max_gap = align_metadata_size(1)*BytesPerWord;
527 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
528 }