110 bool result = true;
111 if (match) {
112 // Has direct control flow from last instruction, need to match the two
113 // frames.
114 result = frame->is_assignable_to(stackmap_frame,
115 ctx, CHECK_VERIFY_(frame->verifier(), result));
116 }
117 if (update) {
118 // Use the frame in stackmap table as current frame
119 int lsize = stackmap_frame->locals_size();
120 int ssize = stackmap_frame->stack_size();
121 if (frame->locals_size() > lsize || frame->stack_size() > ssize) {
122 // Make sure unused type array items are all _bogus_type.
123 frame->reset();
124 }
125 frame->set_locals_size(lsize);
126 frame->copy_locals(stackmap_frame);
127 frame->set_stack_size(ssize);
128 frame->copy_stack(stackmap_frame);
129 frame->set_flags(stackmap_frame->flags());
130 }
131 return result;
132 }
133
134 void StackMapTable::check_jump_target(
135 StackMapFrame* frame, int32_t target, TRAPS) const {
136 ErrorContext ctx;
137 bool match = match_stackmap(
138 frame, target, true, false, &ctx, CHECK_VERIFY(frame->verifier()));
139 if (!match || (target < 0 || target >= _code_length)) {
140 frame->verifier()->verify_error(ctx,
141 "Inconsistent stackmap frames at branch target %d", target);
142 }
143 }
144
145 void StackMapTable::print_on(outputStream* str) const {
146 str->indent().print_cr("StackMapTable: frame_count = %d", _frame_count);
147 str->indent().print_cr("table = { ");
148 {
149 streamIndentor si(str);
150 for (int32_t i = 0; i < _frame_count; ++i) {
151 _frame_array->at(i)->print_on(str);
152 }
153 }
154 str->print_cr(" }");
155 }
156
157 StackMapReader::StackMapReader(ClassVerifier* v, StackMapStream* stream,
158 char* code_data, int32_t code_len,
159 StackMapFrame* init_frame,
160 u2 max_locals, u2 max_stack, TRAPS) :
161 _verifier(v), _stream(stream), _code_data(code_data),
162 _code_length(code_len), _parsed_frame_count(0),
163 _prev_frame(init_frame), _max_locals(max_locals),
164 _max_stack(max_stack), _first(true) {
165 methodHandle m = v->method();
166 if (m->has_stackmap_table()) {
167 _cp = constantPoolHandle(THREAD, m->constants());
168 _frame_count = _stream->get_u2(CHECK);
169 } else {
170 // There's no stackmap table present. Frame count and size are 0.
171 _frame_count = 0;
172 }
173 }
174
175 int32_t StackMapReader::chop(
176 VerificationType* locals, int32_t length, int32_t chops) {
177 if (locals == nullptr) return -1;
178 int32_t pos = length - 1;
179 for (int32_t i=0; i<chops; i++) {
180 if (locals[pos].is_category2_2nd()) {
181 pos -= 2;
182 } else {
183 pos --;
184 }
186 }
187 return pos+1;
188 }
189
190 #define CHECK_NT CHECK_(VerificationType::bogus_type())
191
192 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) {
193 u1 tag = _stream->get_u1(CHECK_NT);
194 if (tag < (u1)ITEM_UninitializedThis) {
195 return VerificationType::from_tag(tag);
196 }
197 if (tag == ITEM_Object) {
198 u2 class_index = _stream->get_u2(CHECK_NT);
199 int nconstants = _cp->length();
200 if ((class_index <= 0 || class_index >= nconstants) ||
201 (!_cp->tag_at(class_index).is_klass() &&
202 !_cp->tag_at(class_index).is_unresolved_klass())) {
203 _stream->stackmap_format_error("bad class index", THREAD);
204 return VerificationType::bogus_type();
205 }
206 return VerificationType::reference_type(_cp->klass_name_at(class_index));
207 }
208 if (tag == ITEM_UninitializedThis) {
209 if (flags != nullptr) {
210 *flags |= FLAG_THIS_UNINIT;
211 }
212 return VerificationType::uninitialized_this_type();
213 }
214 if (tag == ITEM_Uninitialized) {
215 u2 offset = _stream->get_u2(CHECK_NT);
216 if (offset >= _code_length ||
217 _code_data[offset] != ClassVerifier::NEW_OFFSET) {
218 _verifier->class_format_error(
219 "StackMapTable format error: bad offset for Uninitialized");
220 return VerificationType::bogus_type();
221 }
222 return VerificationType::uninitialized_type(offset);
223 }
224 _stream->stackmap_format_error("bad verification type", THREAD);
225 return VerificationType::bogus_type();
226 }
227
228 StackMapFrame* StackMapReader::next(TRAPS) {
229 _parsed_frame_count++;
230 check_size(CHECK_NULL);
231 StackMapFrame* frame = next_helper(CHECK_VERIFY_(_verifier, nullptr));
232 if (frame != nullptr) {
233 check_offset(frame);
234 if (frame->verifier()->has_error()) {
235 return nullptr;
236 }
237 _prev_frame = frame;
238 }
239 return frame;
240 }
241
242 StackMapFrame* StackMapReader::next_helper(TRAPS) {
243 StackMapFrame* frame;
244 int offset;
245 VerificationType* locals = nullptr;
246 u1 frame_type = _stream->get_u1(CHECK_NULL);
247 if (frame_type < 64) {
248 // same_frame
249 if (_first) {
250 offset = frame_type;
251 // Can't share the locals array since that is updated by the verifier.
252 if (_prev_frame->locals_size() > 0) {
253 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
254 THREAD, VerificationType, _prev_frame->locals_size());
255 }
256 } else {
257 offset = _prev_frame->offset() + frame_type + 1;
258 locals = _prev_frame->locals();
259 }
260 frame = new StackMapFrame(
261 offset, _prev_frame->flags(), _prev_frame->locals_size(), 0,
262 _max_locals, _max_stack, locals, nullptr, _verifier);
263 if (_first && locals != nullptr) {
264 frame->copy_locals(_prev_frame);
265 }
266 _first = false;
267 return frame;
268 }
269 if (frame_type < 128) {
270 // same_locals_1_stack_item_frame
271 if (_first) {
272 offset = frame_type - 64;
273 // Can't share the locals array since that is updated by the verifier.
274 if (_prev_frame->locals_size() > 0) {
275 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
276 THREAD, VerificationType, _prev_frame->locals_size());
277 }
278 } else {
279 offset = _prev_frame->offset() + frame_type - 63;
280 locals = _prev_frame->locals();
281 }
282 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
283 THREAD, VerificationType, 2);
284 u2 stack_size = 1;
285 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
286 if (stack[0].is_category2()) {
287 stack[1] = stack[0].to_category2_2nd();
288 stack_size = 2;
289 }
290 check_verification_type_array_size(
291 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
292 frame = new StackMapFrame(
293 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
294 _max_locals, _max_stack, locals, stack, _verifier);
295 if (_first && locals != nullptr) {
296 frame->copy_locals(_prev_frame);
297 }
298 _first = false;
299 return frame;
300 }
301
302 u2 offset_delta = _stream->get_u2(CHECK_NULL);
303
304 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
305 // reserved frame types
306 _stream->stackmap_format_error(
307 "reserved frame type", CHECK_VERIFY_(_verifier, nullptr));
308 }
309
310 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
311 // same_locals_1_stack_item_frame_extended
312 if (_first) {
313 offset = offset_delta;
314 // Can't share the locals array since that is updated by the verifier.
315 if (_prev_frame->locals_size() > 0) {
316 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
317 THREAD, VerificationType, _prev_frame->locals_size());
318 }
319 } else {
320 offset = _prev_frame->offset() + offset_delta + 1;
321 locals = _prev_frame->locals();
322 }
323 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
324 THREAD, VerificationType, 2);
325 u2 stack_size = 1;
326 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
327 if (stack[0].is_category2()) {
328 stack[1] = stack[0].to_category2_2nd();
329 stack_size = 2;
330 }
331 check_verification_type_array_size(
332 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
333 frame = new StackMapFrame(
334 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
335 _max_locals, _max_stack, locals, stack, _verifier);
336 if (_first && locals != nullptr) {
337 frame->copy_locals(_prev_frame);
338 }
339 _first = false;
340 return frame;
341 }
342
343 if (frame_type <= SAME_EXTENDED) {
344 // chop_frame or same_frame_extended
345 locals = _prev_frame->locals();
346 int length = _prev_frame->locals_size();
347 int chops = SAME_EXTENDED - frame_type;
348 int new_length = length;
349 u1 flags = _prev_frame->flags();
350 if (chops != 0) {
351 new_length = chop(locals, length, chops);
352 check_verification_type_array_size(
353 new_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
354 // Recompute flags since uninitializedThis could have been chopped.
355 flags = 0;
357 if (locals[i].is_uninitialized_this()) {
358 flags |= FLAG_THIS_UNINIT;
359 break;
360 }
361 }
362 }
363 if (_first) {
364 offset = offset_delta;
365 // Can't share the locals array since that is updated by the verifier.
366 if (new_length > 0) {
367 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
368 THREAD, VerificationType, new_length);
369 } else {
370 locals = nullptr;
371 }
372 } else {
373 offset = _prev_frame->offset() + offset_delta + 1;
374 }
375 frame = new StackMapFrame(
376 offset, flags, new_length, 0, _max_locals, _max_stack,
377 locals, nullptr, _verifier);
378 if (_first && locals != nullptr) {
379 frame->copy_locals(_prev_frame);
380 }
381 _first = false;
382 return frame;
383 } else if (frame_type < SAME_EXTENDED + 4) {
384 // append_frame
385 int appends = frame_type - SAME_EXTENDED;
386 int real_length = _prev_frame->locals_size();
387 int new_length = real_length + appends*2;
388 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length);
389 VerificationType* pre_locals = _prev_frame->locals();
390 for (int i = 0; i < _prev_frame->locals_size(); i++) {
391 locals[i] = pre_locals[i];
392 }
393 u1 flags = _prev_frame->flags();
394 for (int i = 0; i < appends; i++) {
395 locals[real_length] = parse_verification_type(&flags, CHECK_NULL);
396 if (locals[real_length].is_category2()) {
397 locals[real_length + 1] = locals[real_length].to_category2_2nd();
398 ++real_length;
399 }
400 ++real_length;
401 }
402 check_verification_type_array_size(
403 real_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
404 if (_first) {
405 offset = offset_delta;
406 } else {
407 offset = _prev_frame->offset() + offset_delta + 1;
408 }
409 frame = new StackMapFrame(
410 offset, flags, real_length, 0, _max_locals,
411 _max_stack, locals, nullptr, _verifier);
412 _first = false;
413 return frame;
414 }
415 if (frame_type == FULL) {
416 // full_frame
417 u1 flags = 0;
418 u2 locals_size = _stream->get_u2(CHECK_NULL);
419 int real_locals_size = 0;
420 if (locals_size > 0) {
421 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
422 THREAD, VerificationType, locals_size*2);
423 }
424 for (int i = 0; i < locals_size; i++) {
425 locals[real_locals_size] = parse_verification_type(&flags, CHECK_NULL);
426 if (locals[real_locals_size].is_category2()) {
427 locals[real_locals_size + 1] =
428 locals[real_locals_size].to_category2_2nd();
429 ++real_locals_size;
430 }
431 ++real_locals_size;
439 stack = NEW_RESOURCE_ARRAY_IN_THREAD(
440 THREAD, VerificationType, stack_size*2);
441 }
442 for (int i = 0; i < stack_size; i++) {
443 stack[real_stack_size] = parse_verification_type(nullptr, CHECK_NULL);
444 if (stack[real_stack_size].is_category2()) {
445 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd();
446 ++real_stack_size;
447 }
448 ++real_stack_size;
449 }
450 check_verification_type_array_size(
451 real_stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
452 if (_first) {
453 offset = offset_delta;
454 } else {
455 offset = _prev_frame->offset() + offset_delta + 1;
456 }
457 frame = new StackMapFrame(
458 offset, flags, real_locals_size, real_stack_size,
459 _max_locals, _max_stack, locals, stack, _verifier);
460 _first = false;
461 return frame;
462 }
463
464 _stream->stackmap_format_error(
465 "reserved frame type", CHECK_VERIFY_(_prev_frame->verifier(), nullptr));
466 return nullptr;
467 }
|
110 bool result = true;
111 if (match) {
112 // Has direct control flow from last instruction, need to match the two
113 // frames.
114 result = frame->is_assignable_to(stackmap_frame,
115 ctx, CHECK_VERIFY_(frame->verifier(), result));
116 }
117 if (update) {
118 // Use the frame in stackmap table as current frame
119 int lsize = stackmap_frame->locals_size();
120 int ssize = stackmap_frame->stack_size();
121 if (frame->locals_size() > lsize || frame->stack_size() > ssize) {
122 // Make sure unused type array items are all _bogus_type.
123 frame->reset();
124 }
125 frame->set_locals_size(lsize);
126 frame->copy_locals(stackmap_frame);
127 frame->set_stack_size(ssize);
128 frame->copy_stack(stackmap_frame);
129 frame->set_flags(stackmap_frame->flags());
130 frame->set_assert_unset_fields(stackmap_frame->assert_unset_fields());
131 }
132 return result;
133 }
134
135 void StackMapTable::check_jump_target(
136 StackMapFrame* frame, int32_t target, TRAPS) const {
137 ErrorContext ctx;
138 bool match = match_stackmap(
139 frame, target, true, false, &ctx, CHECK_VERIFY(frame->verifier()));
140 if (!match || (target < 0 || target >= _code_length)) {
141 frame->verifier()->verify_error(ctx,
142 "Inconsistent stackmap frames at branch target %d", target);
143 }
144 }
145
146 void StackMapTable::print_on(outputStream* str) const {
147 str->indent().print_cr("StackMapTable: frame_count = %d", _frame_count);
148 str->indent().print_cr("table = { ");
149 {
150 streamIndentor si(str);
151 for (int32_t i = 0; i < _frame_count; ++i) {
152 _frame_array->at(i)->print_on(str);
153 }
154 }
155 str->print_cr(" }");
156 }
157
158 StackMapReader::StackMapReader(ClassVerifier* v, StackMapStream* stream,
159 char* code_data, int32_t code_len,
160 StackMapFrame* init_frame,
161 u2 max_locals, u2 max_stack,
162 StackMapFrame::AssertUnsetFieldTable* initial_strict_fields, TRAPS) :
163 _verifier(v), _stream(stream), _code_data(code_data),
164 _code_length(code_len), _parsed_frame_count(0),
165 _prev_frame(init_frame), _max_locals(max_locals),
166 _max_stack(max_stack), _assert_unset_fields_buffer(initial_strict_fields),
167 _first(true) {
168 methodHandle m = v->method();
169 if (m->has_stackmap_table()) {
170 _cp = constantPoolHandle(THREAD, m->constants());
171 _frame_count = _stream->get_u2(CHECK);
172 } else {
173 // There's no stackmap table present. Frame count and size are 0.
174 _frame_count = 0;
175 }
176 }
177
178 int32_t StackMapReader::chop(
179 VerificationType* locals, int32_t length, int32_t chops) {
180 if (locals == nullptr) return -1;
181 int32_t pos = length - 1;
182 for (int32_t i=0; i<chops; i++) {
183 if (locals[pos].is_category2_2nd()) {
184 pos -= 2;
185 } else {
186 pos --;
187 }
189 }
190 return pos+1;
191 }
192
193 #define CHECK_NT CHECK_(VerificationType::bogus_type())
194
195 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) {
196 u1 tag = _stream->get_u1(CHECK_NT);
197 if (tag < (u1)ITEM_UninitializedThis) {
198 return VerificationType::from_tag(tag);
199 }
200 if (tag == ITEM_Object) {
201 u2 class_index = _stream->get_u2(CHECK_NT);
202 int nconstants = _cp->length();
203 if ((class_index <= 0 || class_index >= nconstants) ||
204 (!_cp->tag_at(class_index).is_klass() &&
205 !_cp->tag_at(class_index).is_unresolved_klass())) {
206 _stream->stackmap_format_error("bad class index", THREAD);
207 return VerificationType::bogus_type();
208 }
209 Symbol* klass_name = _cp->klass_name_at(class_index);
210 return VerificationType::reference_type(klass_name);
211 }
212 if (tag == ITEM_UninitializedThis) {
213 if (flags != nullptr) {
214 *flags |= FLAG_THIS_UNINIT;
215 }
216 return VerificationType::uninitialized_this_type();
217 }
218 if (tag == ITEM_Uninitialized) {
219 u2 offset = _stream->get_u2(CHECK_NT);
220 if (offset >= _code_length ||
221 _code_data[offset] != ClassVerifier::NEW_OFFSET) {
222 _verifier->class_format_error(
223 "StackMapTable format error: bad offset for Uninitialized");
224 return VerificationType::bogus_type();
225 }
226 return VerificationType::uninitialized_type(offset);
227 }
228 _stream->stackmap_format_error("bad verification type", THREAD);
229 return VerificationType::bogus_type();
230 }
231
232 StackMapFrame* StackMapReader::next(TRAPS) {
233 _parsed_frame_count++;
234 check_size(CHECK_NULL);
235 StackMapFrame* frame = next_helper(CHECK_VERIFY_(_verifier, nullptr));
236 if (frame != nullptr) {
237 check_offset(frame);
238 if (frame->verifier()->has_error()) {
239 return nullptr;
240 }
241 _prev_frame = frame;
242 }
243 return frame;
244 }
245
246 StackMapFrame* StackMapReader::next_helper(TRAPS) {
247 StackMapFrame* frame;
248 int offset;
249 VerificationType* locals = nullptr;
250 u1 frame_type = _stream->get_u1(CHECK_NULL);
251 if (frame_type == EARLY_LARVAL) {
252 u2 num_unset_fields = _stream->get_u2(CHECK_NULL);
253 StackMapFrame::AssertUnsetFieldTable* new_fields = new StackMapFrame::AssertUnsetFieldTable();
254
255 for (u2 i = 0; i < num_unset_fields; i++) {
256 u2 index = _stream->get_u2(CHECK_NULL);
257
258 if (!_cp->is_within_bounds(index) || !_cp->tag_at(index).is_name_and_type()) {
259 _prev_frame->verifier()->verify_error(
260 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
261 "Invalid constant pool index in early larval frame: %d", index);
262 return nullptr;
263 }
264
265 Symbol* name = _cp->symbol_at(_cp->name_ref_index_at(index));
266 Symbol* sig = _cp->symbol_at(_cp->signature_ref_index_at(index));
267 NameAndSig tmp(name, sig);
268
269 if (!_prev_frame->assert_unset_fields()->contains(tmp)) {
270 log_info(verification)("NameAndType %s%s(CP index: %d) is not found among initial strict instance fields", name->as_C_string(), sig->as_C_string(), index);
271 StackMapFrame::print_strict_fields(_prev_frame->assert_unset_fields());
272 _prev_frame->verifier()->verify_error(
273 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
274 "Strict fields not a subset of initial strict instance fields: %s:%s", name->as_C_string(), sig->as_C_string());
275 return nullptr;
276 } else {
277 new_fields->put(tmp, false);
278 }
279 }
280
281 // Only modify strict instance fields the frame has uninitialized this
282 if (_prev_frame->flag_this_uninit()) {
283 _assert_unset_fields_buffer = _prev_frame->merge_unset_fields(new_fields);
284 } else if (new_fields->number_of_entries() > 0) {
285 _prev_frame->verifier()->verify_error(
286 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
287 "Cannot have uninitialized strict fields after class initialization");
288 return nullptr;
289 }
290
291 // Continue reading frame data
292 if (at_end()) {
293 _prev_frame->verifier()->verify_error(
294 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
295 "Early larval frame must be followed by a base frame");
296 return nullptr;
297 }
298
299 frame_type = _stream->get_u1(CHECK_NULL);
300 if (frame_type == EARLY_LARVAL) {
301 _prev_frame->verifier()->verify_error(
302 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
303 "Early larval frame must be followed by a base frame");
304 return nullptr;
305 }
306 }
307
308 if (frame_type < 64) {
309 // same_frame
310 if (_first) {
311 offset = frame_type;
312 // Can't share the locals array since that is updated by the verifier.
313 if (_prev_frame->locals_size() > 0) {
314 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
315 THREAD, VerificationType, _prev_frame->locals_size());
316 }
317 } else {
318 offset = _prev_frame->offset() + frame_type + 1;
319 locals = _prev_frame->locals();
320 }
321 frame = new StackMapFrame(
322 offset, _prev_frame->flags(), _prev_frame->locals_size(), 0,
323 _max_locals, _max_stack, locals, nullptr,
324 _assert_unset_fields_buffer, _verifier);
325 if (_first && locals != nullptr) {
326 frame->copy_locals(_prev_frame);
327 }
328 _first = false;
329 return frame;
330 }
331 if (frame_type < 128) {
332 // same_locals_1_stack_item_frame
333 if (_first) {
334 offset = frame_type - 64;
335 // Can't share the locals array since that is updated by the verifier.
336 if (_prev_frame->locals_size() > 0) {
337 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
338 THREAD, VerificationType, _prev_frame->locals_size());
339 }
340 } else {
341 offset = _prev_frame->offset() + frame_type - 63;
342 locals = _prev_frame->locals();
343 }
344 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
345 THREAD, VerificationType, 2);
346 u2 stack_size = 1;
347 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
348 if (stack[0].is_category2()) {
349 stack[1] = stack[0].to_category2_2nd();
350 stack_size = 2;
351 }
352 check_verification_type_array_size(
353 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
354 frame = new StackMapFrame(
355 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
356 _max_locals, _max_stack, locals, stack,
357 _assert_unset_fields_buffer, _verifier);
358 if (_first && locals != nullptr) {
359 frame->copy_locals(_prev_frame);
360 }
361 _first = false;
362 return frame;
363 }
364
365 u2 offset_delta = _stream->get_u2(CHECK_NULL);
366
367 if (frame_type < EARLY_LARVAL) {
368 // reserved frame types
369 _stream->stackmap_format_error(
370 "reserved frame type", CHECK_VERIFY_(_verifier, nullptr));
371 }
372
373 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
374 // same_locals_1_stack_item_frame_extended
375 if (_first) {
376 offset = offset_delta;
377 // Can't share the locals array since that is updated by the verifier.
378 if (_prev_frame->locals_size() > 0) {
379 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
380 THREAD, VerificationType, _prev_frame->locals_size());
381 }
382 } else {
383 offset = _prev_frame->offset() + offset_delta + 1;
384 locals = _prev_frame->locals();
385 }
386 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
387 THREAD, VerificationType, 2);
388 u2 stack_size = 1;
389 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
390 if (stack[0].is_category2()) {
391 stack[1] = stack[0].to_category2_2nd();
392 stack_size = 2;
393 }
394 check_verification_type_array_size(
395 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
396 frame = new StackMapFrame(
397 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
398 _max_locals, _max_stack, locals, stack,
399 _assert_unset_fields_buffer, _verifier);
400 if (_first && locals != nullptr) {
401 frame->copy_locals(_prev_frame);
402 }
403 _first = false;
404 return frame;
405 }
406
407 if (frame_type <= SAME_EXTENDED) {
408 // chop_frame or same_frame_extended
409 locals = _prev_frame->locals();
410 int length = _prev_frame->locals_size();
411 int chops = SAME_EXTENDED - frame_type;
412 int new_length = length;
413 u1 flags = _prev_frame->flags();
414 if (chops != 0) {
415 new_length = chop(locals, length, chops);
416 check_verification_type_array_size(
417 new_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
418 // Recompute flags since uninitializedThis could have been chopped.
419 flags = 0;
421 if (locals[i].is_uninitialized_this()) {
422 flags |= FLAG_THIS_UNINIT;
423 break;
424 }
425 }
426 }
427 if (_first) {
428 offset = offset_delta;
429 // Can't share the locals array since that is updated by the verifier.
430 if (new_length > 0) {
431 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
432 THREAD, VerificationType, new_length);
433 } else {
434 locals = nullptr;
435 }
436 } else {
437 offset = _prev_frame->offset() + offset_delta + 1;
438 }
439 frame = new StackMapFrame(
440 offset, flags, new_length, 0, _max_locals, _max_stack,
441 locals, nullptr,
442 _assert_unset_fields_buffer, _verifier);
443 if (_first && locals != nullptr) {
444 frame->copy_locals(_prev_frame);
445 }
446 _first = false;
447 return frame;
448 } else if (frame_type < SAME_EXTENDED + 4) {
449 // append_frame
450 int appends = frame_type - SAME_EXTENDED;
451 int real_length = _prev_frame->locals_size();
452 int new_length = real_length + appends*2;
453 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length);
454 VerificationType* pre_locals = _prev_frame->locals();
455 for (int i = 0; i < _prev_frame->locals_size(); i++) {
456 locals[i] = pre_locals[i];
457 }
458 u1 flags = _prev_frame->flags();
459 for (int i = 0; i < appends; i++) {
460 locals[real_length] = parse_verification_type(&flags, CHECK_NULL);
461 if (locals[real_length].is_category2()) {
462 locals[real_length + 1] = locals[real_length].to_category2_2nd();
463 ++real_length;
464 }
465 ++real_length;
466 }
467 check_verification_type_array_size(
468 real_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
469 if (_first) {
470 offset = offset_delta;
471 } else {
472 offset = _prev_frame->offset() + offset_delta + 1;
473 }
474 frame = new StackMapFrame(
475 offset, flags, real_length, 0, _max_locals,
476 _max_stack, locals, nullptr,
477 _assert_unset_fields_buffer, _verifier);
478 _first = false;
479 return frame;
480 }
481 if (frame_type == FULL) {
482 // full_frame
483 u1 flags = 0;
484 u2 locals_size = _stream->get_u2(CHECK_NULL);
485 int real_locals_size = 0;
486 if (locals_size > 0) {
487 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
488 THREAD, VerificationType, locals_size*2);
489 }
490 for (int i = 0; i < locals_size; i++) {
491 locals[real_locals_size] = parse_verification_type(&flags, CHECK_NULL);
492 if (locals[real_locals_size].is_category2()) {
493 locals[real_locals_size + 1] =
494 locals[real_locals_size].to_category2_2nd();
495 ++real_locals_size;
496 }
497 ++real_locals_size;
505 stack = NEW_RESOURCE_ARRAY_IN_THREAD(
506 THREAD, VerificationType, stack_size*2);
507 }
508 for (int i = 0; i < stack_size; i++) {
509 stack[real_stack_size] = parse_verification_type(nullptr, CHECK_NULL);
510 if (stack[real_stack_size].is_category2()) {
511 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd();
512 ++real_stack_size;
513 }
514 ++real_stack_size;
515 }
516 check_verification_type_array_size(
517 real_stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
518 if (_first) {
519 offset = offset_delta;
520 } else {
521 offset = _prev_frame->offset() + offset_delta + 1;
522 }
523 frame = new StackMapFrame(
524 offset, flags, real_locals_size, real_stack_size,
525 _max_locals, _max_stack, locals, stack,
526 _assert_unset_fields_buffer, _verifier);
527 _first = false;
528 return frame;
529 }
530
531 _stream->stackmap_format_error(
532 "reserved frame type", CHECK_VERIFY_(_prev_frame->verifier(), nullptr));
533 return nullptr;
534 }
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