Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapTable.cpp @ 17573:aff11567504c
8035119: Fix exceptions to bytecode verification
Summary: Prevent ctor calls to super() and this() from avoidable code (try blocks, if stmts, etc.)
Reviewed-by: coleenp, acorn, mschoene
| author | hseigel |
|---|---|
| date | Mon, 17 Mar 2014 10:17:55 -0400 |
| parents | 4ee06e614636 |
| children | 2993491d47df |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17573 | 2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/stackMapTable.hpp" | |
| 27 #include "classfile/verifier.hpp" | |
| 28 #include "memory/resourceArea.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "runtime/fieldType.hpp" | |
| 31 #include "runtime/handles.inline.hpp" | |
| 0 | 32 |
| 33 StackMapTable::StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
| 34 u2 max_locals, u2 max_stack, | |
| 35 char* code_data, int code_len, TRAPS) { | |
| 36 _code_length = code_len; | |
| 37 _frame_count = reader->get_frame_count(); | |
| 38 if (_frame_count > 0) { | |
| 39 _frame_array = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, | |
| 40 StackMapFrame*, _frame_count); | |
| 41 StackMapFrame* pre_frame = init_frame; | |
| 42 for (int32_t i = 0; i < _frame_count; i++) { | |
| 43 StackMapFrame* frame = reader->next( | |
| 44 pre_frame, i == 0, max_locals, max_stack, | |
| 45 CHECK_VERIFY(pre_frame->verifier())); | |
| 46 _frame_array[i] = frame; | |
| 47 int offset = frame->offset(); | |
| 48 if (offset >= code_len || code_data[offset] == 0) { | |
| 6605 | 49 frame->verifier()->verify_error( |
| 50 ErrorContext::bad_stackmap(i, frame), | |
| 51 "StackMapTable error: bad offset"); | |
| 0 | 52 return; |
| 53 } | |
| 54 pre_frame = frame; | |
| 55 } | |
| 56 } | |
| 57 reader->check_end(CHECK); | |
| 58 } | |
| 59 | |
| 60 // This method is only called by method in StackMapTable. | |
| 61 int StackMapTable::get_index_from_offset(int32_t offset) const { | |
| 62 int i = 0; | |
| 63 for (; i < _frame_count; i++) { | |
| 64 if (_frame_array[i]->offset() == offset) { | |
| 65 return i; | |
| 66 } | |
| 67 } | |
| 68 return i; // frame with offset doesn't exist in the array | |
| 69 } | |
| 70 | |
| 71 bool StackMapTable::match_stackmap( | |
| 72 StackMapFrame* frame, int32_t target, | |
| 6605 | 73 bool match, bool update, ErrorContext* ctx, TRAPS) const { |
| 0 | 74 int index = get_index_from_offset(target); |
| 6605 | 75 return match_stackmap(frame, target, index, match, update, ctx, THREAD); |
| 0 | 76 } |
| 77 | |
| 78 // Match and/or update current_frame to the frame in stackmap table with | |
| 79 // specified offset and frame index. Return true if the two frames match. | |
| 80 // | |
| 81 // The values of match and update are: _match__update_ | |
| 82 // | |
| 83 // checking a branch target/exception handler: true false | |
| 84 // linear bytecode verification following an | |
| 85 // unconditional branch: false true | |
| 86 // linear bytecode verification not following an | |
| 87 // unconditional branch: true true | |
| 88 bool StackMapTable::match_stackmap( | |
| 89 StackMapFrame* frame, int32_t target, int32_t frame_index, | |
| 6605 | 90 bool match, bool update, ErrorContext* ctx, TRAPS) const { |
| 0 | 91 if (frame_index < 0 || frame_index >= _frame_count) { |
| 6605 | 92 *ctx = ErrorContext::missing_stackmap(frame->offset()); |
| 93 frame->verifier()->verify_error( | |
| 94 *ctx, "Expecting a stackmap frame at branch target %d", target); | |
| 0 | 95 return false; |
| 96 } | |
| 97 | |
| 6605 | 98 StackMapFrame *stackmap_frame = _frame_array[frame_index]; |
| 0 | 99 bool result = true; |
| 100 if (match) { | |
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101 // when checking handler target, match == true && update == false |
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102 bool is_exception_handler = !update; |
| 0 | 103 // Has direct control flow from last instruction, need to match the two |
| 104 // frames. | |
| 6605 | 105 result = frame->is_assignable_to(stackmap_frame, is_exception_handler, |
| 106 ctx, CHECK_VERIFY_(frame->verifier(), result)); | |
| 0 | 107 } |
| 108 if (update) { | |
| 109 // Use the frame in stackmap table as current frame | |
| 110 int lsize = stackmap_frame->locals_size(); | |
| 111 int ssize = stackmap_frame->stack_size(); | |
| 112 if (frame->locals_size() > lsize || frame->stack_size() > ssize) { | |
| 113 // Make sure unused type array items are all _bogus_type. | |
| 114 frame->reset(); | |
| 115 } | |
| 116 frame->set_locals_size(lsize); | |
| 117 frame->copy_locals(stackmap_frame); | |
| 118 frame->set_stack_size(ssize); | |
| 119 frame->copy_stack(stackmap_frame); | |
| 120 frame->set_flags(stackmap_frame->flags()); | |
| 121 } | |
| 122 return result; | |
| 123 } | |
| 124 | |
| 125 void StackMapTable::check_jump_target( | |
| 126 StackMapFrame* frame, int32_t target, TRAPS) const { | |
| 6605 | 127 ErrorContext ctx; |
| 0 | 128 bool match = match_stackmap( |
| 6605 | 129 frame, target, true, false, &ctx, CHECK_VERIFY(frame->verifier())); |
| 0 | 130 if (!match || (target < 0 || target >= _code_length)) { |
| 6605 | 131 frame->verifier()->verify_error(ctx, |
| 132 "Inconsistent stackmap frames at branch target %d", target); | |
| 0 | 133 return; |
| 134 } | |
| 135 // check if uninitialized objects exist on backward branches | |
| 136 check_new_object(frame, target, CHECK_VERIFY(frame->verifier())); | |
| 17573 | 137 frame->verifier()->update_furthest_jump(target); |
| 0 | 138 } |
| 139 | |
| 140 void StackMapTable::check_new_object( | |
| 141 const StackMapFrame* frame, int32_t target, TRAPS) const { | |
| 142 if (frame->offset() > target && frame->has_new_object()) { | |
| 6605 | 143 frame->verifier()->verify_error( |
| 144 ErrorContext::bad_code(frame->offset()), | |
| 145 "Uninitialized object exists on backward branch %d", target); | |
| 0 | 146 return; |
| 147 } | |
| 148 } | |
| 149 | |
| 6605 | 150 void StackMapTable::print_on(outputStream* str) const { |
| 151 str->indent().print_cr("StackMapTable: frame_count = %d", _frame_count); | |
| 152 str->indent().print_cr("table = { "); | |
| 153 { | |
| 154 streamIndentor si(str); | |
| 155 for (int32_t i = 0; i < _frame_count; ++i) { | |
| 156 _frame_array[i]->print_on(str); | |
| 157 } | |
| 0 | 158 } |
| 6605 | 159 str->print_cr(" }"); |
| 0 | 160 } |
| 161 | |
| 162 int32_t StackMapReader::chop( | |
| 163 VerificationType* locals, int32_t length, int32_t chops) { | |
| 1769 | 164 if (locals == NULL) return -1; |
| 0 | 165 int32_t pos = length - 1; |
| 166 for (int32_t i=0; i<chops; i++) { | |
| 167 if (locals[pos].is_category2_2nd()) { | |
| 168 pos -= 2; | |
| 169 } else { | |
| 170 pos --; | |
| 171 } | |
| 172 if (pos<0 && i<(chops-1)) return -1; | |
| 173 } | |
| 174 return pos+1; | |
| 175 } | |
| 176 | |
| 177 VerificationType StackMapReader::parse_verification_type(u1* flags, TRAPS) { | |
| 178 u1 tag = _stream->get_u1(THREAD); | |
| 179 if (tag < (u1)ITEM_UninitializedThis) { | |
| 180 return VerificationType::from_tag(tag); | |
| 181 } | |
| 182 if (tag == ITEM_Object) { | |
| 183 u2 class_index = _stream->get_u2(THREAD); | |
| 184 int nconstants = _cp->length(); | |
| 185 if ((class_index <= 0 || class_index >= nconstants) || | |
| 186 (!_cp->tag_at(class_index).is_klass() && | |
| 187 !_cp->tag_at(class_index).is_unresolved_klass())) { | |
| 188 _stream->stackmap_format_error("bad class index", THREAD); | |
| 189 return VerificationType::bogus_type(); | |
| 190 } | |
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191 return VerificationType::reference_type(_cp->klass_name_at(class_index)); |
| 0 | 192 } |
| 193 if (tag == ITEM_UninitializedThis) { | |
| 194 if (flags != NULL) { | |
| 195 *flags |= FLAG_THIS_UNINIT; | |
| 196 } | |
| 197 return VerificationType::uninitialized_this_type(); | |
| 198 } | |
| 199 if (tag == ITEM_Uninitialized) { | |
| 200 u2 offset = _stream->get_u2(THREAD); | |
| 201 if (offset >= _code_length || | |
| 202 _code_data[offset] != ClassVerifier::NEW_OFFSET) { | |
| 203 ResourceMark rm(THREAD); | |
| 204 _verifier->class_format_error( | |
| 205 "StackMapTable format error: bad offset for Uninitialized"); | |
| 206 return VerificationType::bogus_type(); | |
| 207 } | |
| 208 return VerificationType::uninitialized_type(offset); | |
| 209 } | |
| 210 _stream->stackmap_format_error("bad verification type", THREAD); | |
| 211 return VerificationType::bogus_type(); | |
| 212 } | |
| 213 | |
| 214 StackMapFrame* StackMapReader::next( | |
| 215 StackMapFrame* pre_frame, bool first, u2 max_locals, u2 max_stack, TRAPS) { | |
| 216 StackMapFrame* frame; | |
| 217 int offset; | |
| 218 VerificationType* locals = NULL; | |
| 219 u1 frame_type = _stream->get_u1(THREAD); | |
| 220 if (frame_type < 64) { | |
| 221 // same_frame | |
| 222 if (first) { | |
| 223 offset = frame_type; | |
| 224 // Can't share the locals array since that is updated by the verifier. | |
| 225 if (pre_frame->locals_size() > 0) { | |
| 226 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 227 THREAD, VerificationType, pre_frame->locals_size()); | |
| 228 } | |
| 229 } else { | |
| 230 offset = pre_frame->offset() + frame_type + 1; | |
| 231 locals = pre_frame->locals(); | |
| 232 } | |
| 233 frame = new StackMapFrame( | |
| 234 offset, pre_frame->flags(), pre_frame->locals_size(), 0, | |
| 235 max_locals, max_stack, locals, NULL, _verifier); | |
| 236 if (first && locals != NULL) { | |
| 237 frame->copy_locals(pre_frame); | |
| 238 } | |
| 239 return frame; | |
| 240 } | |
| 241 if (frame_type < 128) { | |
| 242 // same_locals_1_stack_item_frame | |
| 243 if (first) { | |
| 244 offset = frame_type - 64; | |
| 245 // Can't share the locals array since that is updated by the verifier. | |
| 246 if (pre_frame->locals_size() > 0) { | |
| 247 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 248 THREAD, VerificationType, pre_frame->locals_size()); | |
| 249 } | |
| 250 } else { | |
| 251 offset = pre_frame->offset() + frame_type - 63; | |
| 252 locals = pre_frame->locals(); | |
| 253 } | |
| 254 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 255 THREAD, VerificationType, 2); | |
| 256 u2 stack_size = 1; | |
| 257 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
| 258 if (stack[0].is_category2()) { | |
| 259 stack[1] = stack[0].to_category2_2nd(); | |
| 260 stack_size = 2; | |
| 261 } | |
| 262 check_verification_type_array_size( | |
| 263 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
| 264 frame = new StackMapFrame( | |
| 265 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
| 266 max_locals, max_stack, locals, stack, _verifier); | |
| 267 if (first && locals != NULL) { | |
| 268 frame->copy_locals(pre_frame); | |
| 269 } | |
| 270 return frame; | |
| 271 } | |
| 272 | |
| 273 u2 offset_delta = _stream->get_u2(THREAD); | |
| 274 | |
| 275 if (frame_type < SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
| 276 // reserved frame types | |
| 277 _stream->stackmap_format_error( | |
| 278 "reserved frame type", CHECK_VERIFY_(_verifier, NULL)); | |
| 279 } | |
| 280 | |
| 281 if (frame_type == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { | |
| 282 // same_locals_1_stack_item_frame_extended | |
| 283 if (first) { | |
| 284 offset = offset_delta; | |
| 285 // Can't share the locals array since that is updated by the verifier. | |
| 286 if (pre_frame->locals_size() > 0) { | |
| 287 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 288 THREAD, VerificationType, pre_frame->locals_size()); | |
| 289 } | |
| 290 } else { | |
| 291 offset = pre_frame->offset() + offset_delta + 1; | |
| 292 locals = pre_frame->locals(); | |
| 293 } | |
| 294 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 295 THREAD, VerificationType, 2); | |
| 296 u2 stack_size = 1; | |
| 297 stack[0] = parse_verification_type(NULL, CHECK_VERIFY_(_verifier, NULL)); | |
| 298 if (stack[0].is_category2()) { | |
| 299 stack[1] = stack[0].to_category2_2nd(); | |
| 300 stack_size = 2; | |
| 301 } | |
| 302 check_verification_type_array_size( | |
| 303 stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
| 304 frame = new StackMapFrame( | |
| 305 offset, pre_frame->flags(), pre_frame->locals_size(), stack_size, | |
| 306 max_locals, max_stack, locals, stack, _verifier); | |
| 307 if (first && locals != NULL) { | |
| 308 frame->copy_locals(pre_frame); | |
| 309 } | |
| 310 return frame; | |
| 311 } | |
| 312 | |
| 313 if (frame_type <= SAME_EXTENDED) { | |
| 314 // chop_frame or same_frame_extended | |
| 315 locals = pre_frame->locals(); | |
| 316 int length = pre_frame->locals_size(); | |
| 317 int chops = SAME_EXTENDED - frame_type; | |
| 318 int new_length = length; | |
| 319 u1 flags = pre_frame->flags(); | |
| 320 if (chops != 0) { | |
| 321 new_length = chop(locals, length, chops); | |
| 322 check_verification_type_array_size( | |
| 323 new_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
| 324 // Recompute flags since uninitializedThis could have been chopped. | |
| 325 flags = 0; | |
| 326 for (int i=0; i<new_length; i++) { | |
| 327 if (locals[i].is_uninitialized_this()) { | |
| 328 flags |= FLAG_THIS_UNINIT; | |
| 329 break; | |
| 330 } | |
| 331 } | |
| 332 } | |
| 333 if (first) { | |
| 334 offset = offset_delta; | |
| 335 // Can't share the locals array since that is updated by the verifier. | |
| 336 if (new_length > 0) { | |
| 337 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 338 THREAD, VerificationType, new_length); | |
| 339 } else { | |
| 340 locals = NULL; | |
| 341 } | |
| 342 } else { | |
| 343 offset = pre_frame->offset() + offset_delta + 1; | |
| 344 } | |
| 345 frame = new StackMapFrame( | |
| 346 offset, flags, new_length, 0, max_locals, max_stack, | |
| 347 locals, NULL, _verifier); | |
| 348 if (first && locals != NULL) { | |
| 349 frame->copy_locals(pre_frame); | |
| 350 } | |
| 351 return frame; | |
| 352 } else if (frame_type < SAME_EXTENDED + 4) { | |
| 353 // append_frame | |
| 354 int appends = frame_type - SAME_EXTENDED; | |
| 355 int real_length = pre_frame->locals_size(); | |
| 356 int new_length = real_length + appends*2; | |
| 357 locals = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, new_length); | |
| 358 VerificationType* pre_locals = pre_frame->locals(); | |
| 359 int i; | |
| 360 for (i=0; i<pre_frame->locals_size(); i++) { | |
| 361 locals[i] = pre_locals[i]; | |
| 362 } | |
| 363 u1 flags = pre_frame->flags(); | |
| 364 for (i=0; i<appends; i++) { | |
| 365 locals[real_length] = parse_verification_type(&flags, THREAD); | |
| 366 if (locals[real_length].is_category2()) { | |
| 367 locals[real_length + 1] = locals[real_length].to_category2_2nd(); | |
| 368 ++real_length; | |
| 369 } | |
| 370 ++real_length; | |
| 371 } | |
| 372 check_verification_type_array_size( | |
| 373 real_length, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
| 374 if (first) { | |
| 375 offset = offset_delta; | |
| 376 } else { | |
| 377 offset = pre_frame->offset() + offset_delta + 1; | |
| 378 } | |
| 379 frame = new StackMapFrame( | |
| 380 offset, flags, real_length, 0, max_locals, | |
| 381 max_stack, locals, NULL, _verifier); | |
| 382 return frame; | |
| 383 } | |
| 384 if (frame_type == FULL) { | |
| 385 // full_frame | |
| 386 u1 flags = 0; | |
| 387 u2 locals_size = _stream->get_u2(THREAD); | |
| 388 int real_locals_size = 0; | |
| 389 if (locals_size > 0) { | |
| 390 locals = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 391 THREAD, VerificationType, locals_size*2); | |
| 392 } | |
| 393 int i; | |
| 394 for (i=0; i<locals_size; i++) { | |
| 395 locals[real_locals_size] = parse_verification_type(&flags, THREAD); | |
| 396 if (locals[real_locals_size].is_category2()) { | |
| 397 locals[real_locals_size + 1] = | |
| 398 locals[real_locals_size].to_category2_2nd(); | |
| 399 ++real_locals_size; | |
| 400 } | |
| 401 ++real_locals_size; | |
| 402 } | |
| 403 check_verification_type_array_size( | |
| 404 real_locals_size, max_locals, CHECK_VERIFY_(_verifier, NULL)); | |
| 405 u2 stack_size = _stream->get_u2(THREAD); | |
| 406 int real_stack_size = 0; | |
| 407 VerificationType* stack = NULL; | |
| 408 if (stack_size > 0) { | |
| 409 stack = NEW_RESOURCE_ARRAY_IN_THREAD( | |
| 410 THREAD, VerificationType, stack_size*2); | |
| 411 } | |
| 412 for (i=0; i<stack_size; i++) { | |
| 413 stack[real_stack_size] = parse_verification_type(NULL, THREAD); | |
| 414 if (stack[real_stack_size].is_category2()) { | |
| 415 stack[real_stack_size + 1] = stack[real_stack_size].to_category2_2nd(); | |
| 416 ++real_stack_size; | |
| 417 } | |
| 418 ++real_stack_size; | |
| 419 } | |
| 420 check_verification_type_array_size( | |
| 421 real_stack_size, max_stack, CHECK_VERIFY_(_verifier, NULL)); | |
| 422 if (first) { | |
| 423 offset = offset_delta; | |
| 424 } else { | |
| 425 offset = pre_frame->offset() + offset_delta + 1; | |
| 426 } | |
| 427 frame = new StackMapFrame( | |
| 428 offset, flags, real_locals_size, real_stack_size, | |
| 429 max_locals, max_stack, locals, stack, _verifier); | |
| 430 return frame; | |
| 431 } | |
| 432 | |
| 433 _stream->stackmap_format_error( | |
| 434 "reserved frame type", CHECK_VERIFY_(pre_frame->verifier(), NULL)); | |
| 435 return NULL; | |
| 436 } |