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 == ASSERT_UNSET_FIELDS) {
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 Symbol* name = _cp->symbol_at(_cp->name_ref_index_at(index));
258 Symbol* sig = _cp->symbol_at(_cp->signature_ref_index_at(index));
259 NameAndSig tmp(name, sig);
260
261 if (!_prev_frame->assert_unset_fields()->contains(tmp)) {
262 ResourceMark rm(THREAD);
263 log_info(verification)("Field %s%s is not found among initial strict instance fields", name->as_C_string(), sig->as_C_string());
264 StackMapFrame::print_strict_fields(_prev_frame->assert_unset_fields());
265 _prev_frame->verifier()->verify_error(
266 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
267 "Strict fields not a subset of initial strict instance fields: %s:%s", name->as_C_string(), sig->as_C_string());
268 } else {
269 new_fields->put(tmp, false);
270 }
271 }
272
273 // Only modify strict instance fields the frame has uninitialized this
274 if (_prev_frame->flag_this_uninit()) {
275 _assert_unset_fields_buffer = _prev_frame->merge_unset_fields(new_fields);
276 } else if (new_fields->number_of_entries() > 0) {
277 _prev_frame->verifier()->verify_error(
278 ErrorContext::bad_strict_fields(_prev_frame->offset(), _prev_frame),
279 "Cannot have uninitialized strict fields after class initialization");
280 }
281
282 return nullptr;
283 }
284 if (frame_type < 64) {
285 // same_frame
286 if (_first) {
287 offset = frame_type;
288 // Can't share the locals array since that is updated by the verifier.
289 if (_prev_frame->locals_size() > 0) {
290 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
291 THREAD, VerificationType, _prev_frame->locals_size());
292 }
293 } else {
294 offset = _prev_frame->offset() + frame_type + 1;
295 locals = _prev_frame->locals();
296 }
297 frame = new StackMapFrame(
298 offset, _prev_frame->flags(), _prev_frame->locals_size(), 0,
299 _max_locals, _max_stack, locals, nullptr,
300 _assert_unset_fields_buffer, _verifier);
301 if (_first && locals != nullptr) {
302 frame->copy_locals(_prev_frame);
303 }
304 _first = false;
305 return frame;
306 }
307 if (frame_type < 128) {
308 // same_locals_1_stack_item_frame
309 if (_first) {
310 offset = frame_type - 64;
311 // Can't share the locals array since that is updated by the verifier.
312 if (_prev_frame->locals_size() > 0) {
313 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
314 THREAD, VerificationType, _prev_frame->locals_size());
315 }
316 } else {
317 offset = _prev_frame->offset() + frame_type - 63;
318 locals = _prev_frame->locals();
319 }
320 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
321 THREAD, VerificationType, 2);
322 u2 stack_size = 1;
323 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
324 if (stack[0].is_category2()) {
325 stack[1] = stack[0].to_category2_2nd();
326 stack_size = 2;
327 }
328 check_verification_type_array_size(
329 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
330 frame = new StackMapFrame(
331 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
332 _max_locals, _max_stack, locals, stack,
333 _assert_unset_fields_buffer, _verifier);
334 if (_first && locals != nullptr) {
335 frame->copy_locals(_prev_frame);
336 }
337 _first = false;
338 return frame;
339 }
340
341 u2 offset_delta = _stream->get_u2(CHECK_NULL);
342
343 if (frame_type < ASSERT_UNSET_FIELDS) {
344 // reserved frame types
345 _stream->stackmap_format_error(
346 "reserved frame type", CHECK_VERIFY_(_verifier, nullptr));
347 }
348
349 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
350 // same_locals_1_stack_item_frame_extended
351 if (_first) {
352 offset = offset_delta;
353 // Can't share the locals array since that is updated by the verifier.
354 if (_prev_frame->locals_size() > 0) {
355 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
356 THREAD, VerificationType, _prev_frame->locals_size());
357 }
358 } else {
359 offset = _prev_frame->offset() + offset_delta + 1;
360 locals = _prev_frame->locals();
361 }
362 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(
363 THREAD, VerificationType, 2);
364 u2 stack_size = 1;
365 stack[0] = parse_verification_type(nullptr, CHECK_VERIFY_(_verifier, nullptr));
366 if (stack[0].is_category2()) {
367 stack[1] = stack[0].to_category2_2nd();
368 stack_size = 2;
369 }
370 check_verification_type_array_size(
371 stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
372 frame = new StackMapFrame(
373 offset, _prev_frame->flags(), _prev_frame->locals_size(), stack_size,
374 _max_locals, _max_stack, locals, stack,
375 _assert_unset_fields_buffer, _verifier);
376 if (_first && locals != nullptr) {
377 frame->copy_locals(_prev_frame);
378 }
379 _first = false;
380 return frame;
381 }
382
383 if (frame_type <= SAME_EXTENDED) {
384 // chop_frame or same_frame_extended
385 locals = _prev_frame->locals();
386 int length = _prev_frame->locals_size();
387 int chops = SAME_EXTENDED - frame_type;
388 int new_length = length;
389 u1 flags = _prev_frame->flags();
390 if (chops != 0) {
391 new_length = chop(locals, length, chops);
392 check_verification_type_array_size(
393 new_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
394 // Recompute flags since uninitializedThis could have been chopped.
395 flags = 0;
397 if (locals[i].is_uninitialized_this()) {
398 flags |= FLAG_THIS_UNINIT;
399 break;
400 }
401 }
402 }
403 if (_first) {
404 offset = offset_delta;
405 // Can't share the locals array since that is updated by the verifier.
406 if (new_length > 0) {
407 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
408 THREAD, VerificationType, new_length);
409 } else {
410 locals = nullptr;
411 }
412 } else {
413 offset = _prev_frame->offset() + offset_delta + 1;
414 }
415 frame = new StackMapFrame(
416 offset, flags, new_length, 0, _max_locals, _max_stack,
417 locals, nullptr,
418 _assert_unset_fields_buffer, _verifier);
419 if (_first && locals != nullptr) {
420 frame->copy_locals(_prev_frame);
421 }
422 _first = false;
423 return frame;
424 } else if (frame_type < SAME_EXTENDED + 4) {
425 // append_frame
426 int appends = frame_type - SAME_EXTENDED;
427 int real_length = _prev_frame->locals_size();
428 int new_length = real_length + appends*2;
429 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length);
430 VerificationType* pre_locals = _prev_frame->locals();
431 for (int i = 0; i < _prev_frame->locals_size(); i++) {
432 locals[i] = pre_locals[i];
433 }
434 u1 flags = _prev_frame->flags();
435 for (int i = 0; i < appends; i++) {
436 locals[real_length] = parse_verification_type(&flags, CHECK_NULL);
437 if (locals[real_length].is_category2()) {
438 locals[real_length + 1] = locals[real_length].to_category2_2nd();
439 ++real_length;
440 }
441 ++real_length;
442 }
443 check_verification_type_array_size(
444 real_length, _max_locals, CHECK_VERIFY_(_verifier, nullptr));
445 if (_first) {
446 offset = offset_delta;
447 } else {
448 offset = _prev_frame->offset() + offset_delta + 1;
449 }
450 frame = new StackMapFrame(
451 offset, flags, real_length, 0, _max_locals,
452 _max_stack, locals, nullptr,
453 _assert_unset_fields_buffer, _verifier);
454 _first = false;
455 return frame;
456 }
457 if (frame_type == FULL) {
458 // full_frame
459 u1 flags = 0;
460 u2 locals_size = _stream->get_u2(CHECK_NULL);
461 int real_locals_size = 0;
462 if (locals_size > 0) {
463 locals = NEW_RESOURCE_ARRAY_IN_THREAD(
464 THREAD, VerificationType, locals_size*2);
465 }
466 for (int i = 0; i < locals_size; i++) {
467 locals[real_locals_size] = parse_verification_type(&flags, CHECK_NULL);
468 if (locals[real_locals_size].is_category2()) {
469 locals[real_locals_size + 1] =
470 locals[real_locals_size].to_category2_2nd();
471 ++real_locals_size;
472 }
473 ++real_locals_size;
481 stack = NEW_RESOURCE_ARRAY_IN_THREAD(
482 THREAD, VerificationType, stack_size*2);
483 }
484 for (int i = 0; i < stack_size; i++) {
485 stack[real_stack_size] = parse_verification_type(nullptr, CHECK_NULL);
486 if (stack[real_stack_size].is_category2()) {
487 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd();
488 ++real_stack_size;
489 }
490 ++real_stack_size;
491 }
492 check_verification_type_array_size(
493 real_stack_size, _max_stack, CHECK_VERIFY_(_verifier, nullptr));
494 if (_first) {
495 offset = offset_delta;
496 } else {
497 offset = _prev_frame->offset() + offset_delta + 1;
498 }
499 frame = new StackMapFrame(
500 offset, flags, real_locals_size, real_stack_size,
501 _max_locals, _max_stack, locals, stack,
502 _assert_unset_fields_buffer, _verifier);
503 _first = false;
504 return frame;
505 }
506
507 _stream->stackmap_format_error(
508 "reserved frame type", CHECK_VERIFY_(_prev_frame->verifier(), nullptr));
509 return nullptr;
510 }
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