Tue, 17 Oct 2017 12:58:25 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "oops/oop.inline.hpp" |
aoqi@0 | 27 | #include "oops/symbol.hpp" |
aoqi@0 | 28 | #include "prims/jvmtiRedefineClassesTrace.hpp" |
aoqi@0 | 29 | #include "prims/methodComparator.hpp" |
aoqi@0 | 30 | #include "runtime/handles.inline.hpp" |
aoqi@0 | 31 | #include "utilities/globalDefinitions.hpp" |
aoqi@0 | 32 | |
aoqi@0 | 33 | BytecodeStream *MethodComparator::_s_old; |
aoqi@0 | 34 | BytecodeStream *MethodComparator::_s_new; |
aoqi@0 | 35 | ConstantPool* MethodComparator::_old_cp; |
aoqi@0 | 36 | ConstantPool* MethodComparator::_new_cp; |
aoqi@0 | 37 | BciMap *MethodComparator::_bci_map; |
aoqi@0 | 38 | bool MethodComparator::_switchable_test; |
aoqi@0 | 39 | GrowableArray<int> *MethodComparator::_fwd_jmps; |
aoqi@0 | 40 | |
aoqi@0 | 41 | bool MethodComparator::methods_EMCP(Method* old_method, Method* new_method) { |
aoqi@0 | 42 | if (old_method->code_size() != new_method->code_size()) |
aoqi@0 | 43 | return false; |
aoqi@0 | 44 | if (check_stack_and_locals_size(old_method, new_method) != 0) { |
aoqi@0 | 45 | // RC_TRACE macro has an embedded ResourceMark |
aoqi@0 | 46 | RC_TRACE(0x00800000, ("Methods %s non-comparable with diagnosis %d", |
aoqi@0 | 47 | old_method->name()->as_C_string(), |
aoqi@0 | 48 | check_stack_and_locals_size(old_method, new_method))); |
aoqi@0 | 49 | return false; |
aoqi@0 | 50 | } |
aoqi@0 | 51 | |
aoqi@0 | 52 | _old_cp = old_method->constants(); |
aoqi@0 | 53 | _new_cp = new_method->constants(); |
aoqi@0 | 54 | BytecodeStream s_old(old_method); |
aoqi@0 | 55 | BytecodeStream s_new(new_method); |
aoqi@0 | 56 | _s_old = &s_old; |
aoqi@0 | 57 | _s_new = &s_new; |
aoqi@0 | 58 | _switchable_test = false; |
aoqi@0 | 59 | Bytecodes::Code c_old, c_new; |
aoqi@0 | 60 | |
aoqi@0 | 61 | while ((c_old = s_old.next()) >= 0) { |
aoqi@0 | 62 | if ((c_new = s_new.next()) < 0 || c_old != c_new) |
aoqi@0 | 63 | return false; |
aoqi@0 | 64 | |
aoqi@0 | 65 | if (! args_same(c_old, c_new)) |
aoqi@0 | 66 | return false; |
aoqi@0 | 67 | } |
aoqi@0 | 68 | return true; |
aoqi@0 | 69 | } |
aoqi@0 | 70 | |
aoqi@0 | 71 | |
aoqi@0 | 72 | bool MethodComparator::methods_switchable(Method* old_method, Method* new_method, |
aoqi@0 | 73 | BciMap &bci_map) { |
aoqi@0 | 74 | if (old_method->code_size() > new_method->code_size()) |
aoqi@0 | 75 | // Something has definitely been deleted in the new method, compared to the old one. |
aoqi@0 | 76 | return false; |
aoqi@0 | 77 | |
aoqi@0 | 78 | if (! check_stack_and_locals_size(old_method, new_method)) |
aoqi@0 | 79 | return false; |
aoqi@0 | 80 | |
aoqi@0 | 81 | _old_cp = old_method->constants(); |
aoqi@0 | 82 | _new_cp = new_method->constants(); |
aoqi@0 | 83 | BytecodeStream s_old(old_method); |
aoqi@0 | 84 | BytecodeStream s_new(new_method); |
aoqi@0 | 85 | _s_old = &s_old; |
aoqi@0 | 86 | _s_new = &s_new; |
aoqi@0 | 87 | _bci_map = &bci_map; |
aoqi@0 | 88 | _switchable_test = true; |
aoqi@0 | 89 | GrowableArray<int> fwd_jmps(16); |
aoqi@0 | 90 | _fwd_jmps = &fwd_jmps; |
aoqi@0 | 91 | Bytecodes::Code c_old, c_new; |
aoqi@0 | 92 | |
aoqi@0 | 93 | while ((c_old = s_old.next()) >= 0) { |
aoqi@0 | 94 | if ((c_new = s_new.next()) < 0) |
aoqi@0 | 95 | return false; |
aoqi@0 | 96 | if (! (c_old == c_new && args_same(c_old, c_new))) { |
aoqi@0 | 97 | int old_bci = s_old.bci(); |
aoqi@0 | 98 | int new_st_bci = s_new.bci(); |
aoqi@0 | 99 | bool found_match = false; |
aoqi@0 | 100 | do { |
aoqi@0 | 101 | c_new = s_new.next(); |
aoqi@0 | 102 | if (c_new == c_old && args_same(c_old, c_new)) { |
aoqi@0 | 103 | found_match = true; |
aoqi@0 | 104 | break; |
aoqi@0 | 105 | } |
aoqi@0 | 106 | } while (c_new >= 0); |
aoqi@0 | 107 | if (! found_match) |
aoqi@0 | 108 | return false; |
aoqi@0 | 109 | int new_end_bci = s_new.bci(); |
aoqi@0 | 110 | bci_map.store_fragment_location(old_bci, new_st_bci, new_end_bci); |
aoqi@0 | 111 | } |
aoqi@0 | 112 | } |
aoqi@0 | 113 | |
aoqi@0 | 114 | // Now we can test all forward jumps |
aoqi@0 | 115 | for (int i = 0; i < fwd_jmps.length() / 2; i++) { |
aoqi@0 | 116 | if (! bci_map.old_and_new_locations_same(fwd_jmps.at(i*2), fwd_jmps.at(i*2+1))) { |
aoqi@0 | 117 | RC_TRACE(0x00800000, |
aoqi@0 | 118 | ("Fwd jump miss: old dest = %d, calc new dest = %d, act new dest = %d", |
aoqi@0 | 119 | fwd_jmps.at(i*2), bci_map.new_bci_for_old(fwd_jmps.at(i*2)), |
aoqi@0 | 120 | fwd_jmps.at(i*2+1))); |
aoqi@0 | 121 | return false; |
aoqi@0 | 122 | } |
aoqi@0 | 123 | } |
aoqi@0 | 124 | |
aoqi@0 | 125 | return true; |
aoqi@0 | 126 | } |
aoqi@0 | 127 | |
aoqi@0 | 128 | |
aoqi@0 | 129 | bool MethodComparator::args_same(Bytecodes::Code c_old, Bytecodes::Code c_new) { |
aoqi@0 | 130 | // BytecodeStream returns the correct standard Java bytecodes for various "fast" |
aoqi@0 | 131 | // bytecode versions, so we don't have to bother about them here.. |
aoqi@0 | 132 | switch (c_old) { |
aoqi@0 | 133 | case Bytecodes::_new : // fall through |
aoqi@0 | 134 | case Bytecodes::_anewarray : // fall through |
aoqi@0 | 135 | case Bytecodes::_multianewarray : // fall through |
aoqi@0 | 136 | case Bytecodes::_checkcast : // fall through |
aoqi@0 | 137 | case Bytecodes::_instanceof : { |
aoqi@0 | 138 | u2 cpi_old = _s_old->get_index_u2(); |
aoqi@0 | 139 | u2 cpi_new = _s_new->get_index_u2(); |
aoqi@0 | 140 | if ((_old_cp->klass_at_noresolve(cpi_old) != _new_cp->klass_at_noresolve(cpi_new))) |
aoqi@0 | 141 | return false; |
aoqi@0 | 142 | if (c_old == Bytecodes::_multianewarray && |
aoqi@0 | 143 | *(jbyte*)(_s_old->bcp() + 3) != *(jbyte*)(_s_new->bcp() + 3)) |
aoqi@0 | 144 | return false; |
aoqi@0 | 145 | break; |
aoqi@0 | 146 | } |
aoqi@0 | 147 | |
aoqi@0 | 148 | case Bytecodes::_getstatic : // fall through |
aoqi@0 | 149 | case Bytecodes::_putstatic : // fall through |
aoqi@0 | 150 | case Bytecodes::_getfield : // fall through |
aoqi@0 | 151 | case Bytecodes::_putfield : // fall through |
aoqi@0 | 152 | case Bytecodes::_invokevirtual : // fall through |
aoqi@0 | 153 | case Bytecodes::_invokespecial : // fall through |
aoqi@0 | 154 | case Bytecodes::_invokestatic : // fall through |
aoqi@0 | 155 | case Bytecodes::_invokeinterface : { |
aoqi@0 | 156 | int cpci_old = _s_old->get_index_u2_cpcache(); |
aoqi@0 | 157 | int cpci_new = _s_new->get_index_u2_cpcache(); |
aoqi@0 | 158 | // Check if the names of classes, field/method names and signatures at these indexes |
aoqi@0 | 159 | // are the same. Indices which are really into constantpool cache (rather than constant |
aoqi@0 | 160 | // pool itself) are accepted by the constantpool query routines below. |
aoqi@0 | 161 | if ((_old_cp->klass_ref_at_noresolve(cpci_old) != _new_cp->klass_ref_at_noresolve(cpci_new)) || |
aoqi@0 | 162 | (_old_cp->name_ref_at(cpci_old) != _new_cp->name_ref_at(cpci_new)) || |
aoqi@0 | 163 | (_old_cp->signature_ref_at(cpci_old) != _new_cp->signature_ref_at(cpci_new))) |
aoqi@0 | 164 | return false; |
aoqi@0 | 165 | break; |
aoqi@0 | 166 | } |
aoqi@0 | 167 | case Bytecodes::_invokedynamic: { |
aoqi@0 | 168 | int cpci_old = _s_old->get_index_u4(); |
aoqi@0 | 169 | int cpci_new = _s_new->get_index_u4(); |
aoqi@0 | 170 | |
aoqi@0 | 171 | // Check if the names of classes, field/method names and signatures at these indexes |
aoqi@0 | 172 | // are the same. Indices which are really into constantpool cache (rather than constant |
aoqi@0 | 173 | // pool itself) are accepted by the constantpool query routines below. |
aoqi@0 | 174 | if ((_old_cp->name_ref_at(cpci_old) != _new_cp->name_ref_at(cpci_new)) || |
aoqi@0 | 175 | (_old_cp->signature_ref_at(cpci_old) != _new_cp->signature_ref_at(cpci_new))) |
aoqi@0 | 176 | return false; |
aoqi@0 | 177 | |
aoqi@0 | 178 | // Translate object indexes to constant pool cache indexes. |
aoqi@0 | 179 | cpci_old = _old_cp->invokedynamic_cp_cache_index(cpci_old); |
aoqi@0 | 180 | cpci_new = _new_cp->invokedynamic_cp_cache_index(cpci_new); |
aoqi@0 | 181 | |
aoqi@0 | 182 | int cpi_old = _old_cp->cache()->entry_at(cpci_old)->constant_pool_index(); |
aoqi@0 | 183 | int cpi_new = _new_cp->cache()->entry_at(cpci_new)->constant_pool_index(); |
aoqi@0 | 184 | int bsm_old = _old_cp->invoke_dynamic_bootstrap_method_ref_index_at(cpi_old); |
aoqi@0 | 185 | int bsm_new = _new_cp->invoke_dynamic_bootstrap_method_ref_index_at(cpi_new); |
aoqi@0 | 186 | if (!pool_constants_same(bsm_old, bsm_new)) |
aoqi@0 | 187 | return false; |
aoqi@0 | 188 | int cnt_old = _old_cp->invoke_dynamic_argument_count_at(cpi_old); |
aoqi@0 | 189 | int cnt_new = _new_cp->invoke_dynamic_argument_count_at(cpi_new); |
aoqi@0 | 190 | if (cnt_old != cnt_new) |
aoqi@0 | 191 | return false; |
aoqi@0 | 192 | for (int arg_i = 0; arg_i < cnt_old; arg_i++) { |
aoqi@0 | 193 | int idx_old = _old_cp->invoke_dynamic_argument_index_at(cpi_old, arg_i); |
aoqi@0 | 194 | int idx_new = _new_cp->invoke_dynamic_argument_index_at(cpi_new, arg_i); |
aoqi@0 | 195 | if (!pool_constants_same(idx_old, idx_new)) |
aoqi@0 | 196 | return false; |
aoqi@0 | 197 | } |
aoqi@0 | 198 | break; |
aoqi@0 | 199 | } |
aoqi@0 | 200 | |
aoqi@0 | 201 | case Bytecodes::_ldc : // fall through |
aoqi@0 | 202 | case Bytecodes::_ldc_w : { |
aoqi@0 | 203 | Bytecode_loadconstant ldc_old(_s_old->method(), _s_old->bci()); |
aoqi@0 | 204 | Bytecode_loadconstant ldc_new(_s_new->method(), _s_new->bci()); |
aoqi@0 | 205 | int cpi_old = ldc_old.pool_index(); |
aoqi@0 | 206 | int cpi_new = ldc_new.pool_index(); |
aoqi@0 | 207 | if (!pool_constants_same(cpi_old, cpi_new)) |
aoqi@0 | 208 | return false; |
aoqi@0 | 209 | break; |
aoqi@0 | 210 | } |
aoqi@0 | 211 | |
aoqi@0 | 212 | case Bytecodes::_ldc2_w : { |
aoqi@0 | 213 | u2 cpi_old = _s_old->get_index_u2(); |
aoqi@0 | 214 | u2 cpi_new = _s_new->get_index_u2(); |
aoqi@0 | 215 | constantTag tag_old = _old_cp->tag_at(cpi_old); |
aoqi@0 | 216 | constantTag tag_new = _new_cp->tag_at(cpi_new); |
aoqi@0 | 217 | if (tag_old.value() != tag_new.value()) |
aoqi@0 | 218 | return false; |
aoqi@0 | 219 | if (tag_old.is_long()) { |
aoqi@0 | 220 | if (_old_cp->long_at(cpi_old) != _new_cp->long_at(cpi_new)) |
aoqi@0 | 221 | return false; |
aoqi@0 | 222 | } else { |
aoqi@0 | 223 | // Use jlong_cast to compare the bits rather than numerical values. |
aoqi@0 | 224 | // This makes a difference for NaN constants. |
aoqi@0 | 225 | if (jlong_cast(_old_cp->double_at(cpi_old)) != jlong_cast(_new_cp->double_at(cpi_new))) |
aoqi@0 | 226 | return false; |
aoqi@0 | 227 | } |
aoqi@0 | 228 | break; |
aoqi@0 | 229 | } |
aoqi@0 | 230 | |
aoqi@0 | 231 | case Bytecodes::_bipush : |
aoqi@0 | 232 | if (_s_old->bcp()[1] != _s_new->bcp()[1]) |
aoqi@0 | 233 | return false; |
aoqi@0 | 234 | break; |
aoqi@0 | 235 | |
aoqi@0 | 236 | case Bytecodes::_sipush : |
aoqi@0 | 237 | if (_s_old->get_index_u2() != _s_new->get_index_u2()) |
aoqi@0 | 238 | return false; |
aoqi@0 | 239 | break; |
aoqi@0 | 240 | |
aoqi@0 | 241 | case Bytecodes::_aload : // fall through |
aoqi@0 | 242 | case Bytecodes::_astore : // fall through |
aoqi@0 | 243 | case Bytecodes::_dload : // fall through |
aoqi@0 | 244 | case Bytecodes::_dstore : // fall through |
aoqi@0 | 245 | case Bytecodes::_fload : // fall through |
aoqi@0 | 246 | case Bytecodes::_fstore : // fall through |
aoqi@0 | 247 | case Bytecodes::_iload : // fall through |
aoqi@0 | 248 | case Bytecodes::_istore : // fall through |
aoqi@0 | 249 | case Bytecodes::_lload : // fall through |
aoqi@0 | 250 | case Bytecodes::_lstore : // fall through |
aoqi@0 | 251 | case Bytecodes::_ret : |
aoqi@0 | 252 | if (_s_old->is_wide() != _s_new->is_wide()) |
aoqi@0 | 253 | return false; |
aoqi@0 | 254 | if (_s_old->get_index() != _s_new->get_index()) |
aoqi@0 | 255 | return false; |
aoqi@0 | 256 | break; |
aoqi@0 | 257 | |
aoqi@0 | 258 | case Bytecodes::_goto : // fall through |
aoqi@0 | 259 | case Bytecodes::_if_acmpeq : // fall through |
aoqi@0 | 260 | case Bytecodes::_if_acmpne : // fall through |
aoqi@0 | 261 | case Bytecodes::_if_icmpeq : // fall through |
aoqi@0 | 262 | case Bytecodes::_if_icmpne : // fall through |
aoqi@0 | 263 | case Bytecodes::_if_icmplt : // fall through |
aoqi@0 | 264 | case Bytecodes::_if_icmpge : // fall through |
aoqi@0 | 265 | case Bytecodes::_if_icmpgt : // fall through |
aoqi@0 | 266 | case Bytecodes::_if_icmple : // fall through |
aoqi@0 | 267 | case Bytecodes::_ifeq : // fall through |
aoqi@0 | 268 | case Bytecodes::_ifne : // fall through |
aoqi@0 | 269 | case Bytecodes::_iflt : // fall through |
aoqi@0 | 270 | case Bytecodes::_ifge : // fall through |
aoqi@0 | 271 | case Bytecodes::_ifgt : // fall through |
aoqi@0 | 272 | case Bytecodes::_ifle : // fall through |
aoqi@0 | 273 | case Bytecodes::_ifnonnull : // fall through |
aoqi@0 | 274 | case Bytecodes::_ifnull : // fall through |
aoqi@0 | 275 | case Bytecodes::_jsr : { |
aoqi@0 | 276 | int old_ofs = _s_old->bytecode().get_offset_s2(c_old); |
aoqi@0 | 277 | int new_ofs = _s_new->bytecode().get_offset_s2(c_new); |
aoqi@0 | 278 | if (_switchable_test) { |
aoqi@0 | 279 | int old_dest = _s_old->bci() + old_ofs; |
aoqi@0 | 280 | int new_dest = _s_new->bci() + new_ofs; |
aoqi@0 | 281 | if (old_ofs < 0 && new_ofs < 0) { |
aoqi@0 | 282 | if (! _bci_map->old_and_new_locations_same(old_dest, new_dest)) |
aoqi@0 | 283 | return false; |
aoqi@0 | 284 | } else if (old_ofs > 0 && new_ofs > 0) { |
aoqi@0 | 285 | _fwd_jmps->append(old_dest); |
aoqi@0 | 286 | _fwd_jmps->append(new_dest); |
aoqi@0 | 287 | } else { |
aoqi@0 | 288 | return false; |
aoqi@0 | 289 | } |
aoqi@0 | 290 | } else { |
aoqi@0 | 291 | if (old_ofs != new_ofs) |
aoqi@0 | 292 | return false; |
aoqi@0 | 293 | } |
aoqi@0 | 294 | break; |
aoqi@0 | 295 | } |
aoqi@0 | 296 | |
aoqi@0 | 297 | case Bytecodes::_iinc : |
aoqi@0 | 298 | if (_s_old->is_wide() != _s_new->is_wide()) |
aoqi@0 | 299 | return false; |
aoqi@0 | 300 | if (! _s_old->is_wide()) { |
aoqi@0 | 301 | // We could use get_index_u1 and get_constant_u1, but it's simpler to grab both bytes at once: |
aoqi@0 | 302 | if (Bytes::get_Java_u2(_s_old->bcp() + 1) != Bytes::get_Java_u2(_s_new->bcp() + 1)) |
aoqi@0 | 303 | return false; |
aoqi@0 | 304 | } else { |
aoqi@0 | 305 | // We could use get_index_u2 and get_constant_u2, but it's simpler to grab all four bytes at once: |
aoqi@0 | 306 | if (Bytes::get_Java_u4(_s_old->bcp() + 1) != Bytes::get_Java_u4(_s_new->bcp() + 1)) |
aoqi@0 | 307 | return false; |
aoqi@0 | 308 | } |
aoqi@0 | 309 | break; |
aoqi@0 | 310 | |
aoqi@0 | 311 | case Bytecodes::_goto_w : // fall through |
aoqi@0 | 312 | case Bytecodes::_jsr_w : { |
aoqi@0 | 313 | int old_ofs = _s_old->bytecode().get_offset_s4(c_old); |
aoqi@0 | 314 | int new_ofs = _s_new->bytecode().get_offset_s4(c_new); |
aoqi@0 | 315 | if (_switchable_test) { |
aoqi@0 | 316 | int old_dest = _s_old->bci() + old_ofs; |
aoqi@0 | 317 | int new_dest = _s_new->bci() + new_ofs; |
aoqi@0 | 318 | if (old_ofs < 0 && new_ofs < 0) { |
aoqi@0 | 319 | if (! _bci_map->old_and_new_locations_same(old_dest, new_dest)) |
aoqi@0 | 320 | return false; |
aoqi@0 | 321 | } else if (old_ofs > 0 && new_ofs > 0) { |
aoqi@0 | 322 | _fwd_jmps->append(old_dest); |
aoqi@0 | 323 | _fwd_jmps->append(new_dest); |
aoqi@0 | 324 | } else { |
aoqi@0 | 325 | return false; |
aoqi@0 | 326 | } |
aoqi@0 | 327 | } else { |
aoqi@0 | 328 | if (old_ofs != new_ofs) |
aoqi@0 | 329 | return false; |
aoqi@0 | 330 | } |
aoqi@0 | 331 | break; |
aoqi@0 | 332 | } |
aoqi@0 | 333 | |
aoqi@0 | 334 | case Bytecodes::_lookupswitch : // fall through |
aoqi@0 | 335 | case Bytecodes::_tableswitch : { |
aoqi@0 | 336 | if (_switchable_test) { |
aoqi@0 | 337 | address aligned_bcp_old = (address) round_to((intptr_t)_s_old->bcp() + 1, jintSize); |
aoqi@0 | 338 | address aligned_bcp_new = (address) round_to((intptr_t)_s_new->bcp() + 1, jintSize); |
aoqi@0 | 339 | int default_old = (int) Bytes::get_Java_u4(aligned_bcp_old); |
aoqi@0 | 340 | int default_new = (int) Bytes::get_Java_u4(aligned_bcp_new); |
aoqi@0 | 341 | _fwd_jmps->append(_s_old->bci() + default_old); |
aoqi@0 | 342 | _fwd_jmps->append(_s_new->bci() + default_new); |
aoqi@0 | 343 | if (c_old == Bytecodes::_lookupswitch) { |
aoqi@0 | 344 | int npairs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize); |
aoqi@0 | 345 | int npairs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize); |
aoqi@0 | 346 | if (npairs_old != npairs_new) |
aoqi@0 | 347 | return false; |
aoqi@0 | 348 | for (int i = 0; i < npairs_old; i++) { |
aoqi@0 | 349 | int match_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i)*jintSize); |
aoqi@0 | 350 | int match_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i)*jintSize); |
aoqi@0 | 351 | if (match_old != match_new) |
aoqi@0 | 352 | return false; |
aoqi@0 | 353 | int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i+1)*jintSize); |
aoqi@0 | 354 | int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i+1)*jintSize); |
aoqi@0 | 355 | _fwd_jmps->append(_s_old->bci() + ofs_old); |
aoqi@0 | 356 | _fwd_jmps->append(_s_new->bci() + ofs_new); |
aoqi@0 | 357 | } |
aoqi@0 | 358 | } else if (c_old == Bytecodes::_tableswitch) { |
aoqi@0 | 359 | int lo_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize); |
aoqi@0 | 360 | int lo_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize); |
aoqi@0 | 361 | if (lo_old != lo_new) |
aoqi@0 | 362 | return false; |
aoqi@0 | 363 | int hi_old = (int) Bytes::get_Java_u4(aligned_bcp_old + 2*jintSize); |
aoqi@0 | 364 | int hi_new = (int) Bytes::get_Java_u4(aligned_bcp_new + 2*jintSize); |
aoqi@0 | 365 | if (hi_old != hi_new) |
aoqi@0 | 366 | return false; |
aoqi@0 | 367 | for (int i = 0; i < hi_old - lo_old + 1; i++) { |
aoqi@0 | 368 | int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (3+i)*jintSize); |
aoqi@0 | 369 | int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (3+i)*jintSize); |
aoqi@0 | 370 | _fwd_jmps->append(_s_old->bci() + ofs_old); |
aoqi@0 | 371 | _fwd_jmps->append(_s_new->bci() + ofs_new); |
aoqi@0 | 372 | } |
aoqi@0 | 373 | } |
aoqi@0 | 374 | } else { // !_switchable_test, can use fast rough compare |
aoqi@0 | 375 | int len_old = _s_old->instruction_size(); |
aoqi@0 | 376 | int len_new = _s_new->instruction_size(); |
aoqi@0 | 377 | if (len_old != len_new) |
aoqi@0 | 378 | return false; |
aoqi@0 | 379 | if (memcmp(_s_old->bcp(), _s_new->bcp(), len_old) != 0) |
aoqi@0 | 380 | return false; |
aoqi@0 | 381 | } |
aoqi@0 | 382 | break; |
aoqi@0 | 383 | } |
aoqi@0 | 384 | } |
aoqi@0 | 385 | |
aoqi@0 | 386 | return true; |
aoqi@0 | 387 | } |
aoqi@0 | 388 | |
aoqi@0 | 389 | bool MethodComparator::pool_constants_same(int cpi_old, int cpi_new) { |
aoqi@0 | 390 | constantTag tag_old = _old_cp->tag_at(cpi_old); |
aoqi@0 | 391 | constantTag tag_new = _new_cp->tag_at(cpi_new); |
aoqi@0 | 392 | if (tag_old.is_int() || tag_old.is_float()) { |
aoqi@0 | 393 | if (tag_old.value() != tag_new.value()) |
aoqi@0 | 394 | return false; |
aoqi@0 | 395 | if (tag_old.is_int()) { |
aoqi@0 | 396 | if (_old_cp->int_at(cpi_old) != _new_cp->int_at(cpi_new)) |
aoqi@0 | 397 | return false; |
aoqi@0 | 398 | } else { |
aoqi@0 | 399 | // Use jint_cast to compare the bits rather than numerical values. |
aoqi@0 | 400 | // This makes a difference for NaN constants. |
aoqi@0 | 401 | if (jint_cast(_old_cp->float_at(cpi_old)) != jint_cast(_new_cp->float_at(cpi_new))) |
aoqi@0 | 402 | return false; |
aoqi@0 | 403 | } |
aoqi@0 | 404 | } else if (tag_old.is_string() && tag_new.is_string()) { |
aoqi@0 | 405 | if (strcmp(_old_cp->string_at_noresolve(cpi_old), |
aoqi@0 | 406 | _new_cp->string_at_noresolve(cpi_new)) != 0) |
aoqi@0 | 407 | return false; |
aoqi@0 | 408 | } else if (tag_old.is_klass() || tag_old.is_unresolved_klass()) { |
aoqi@0 | 409 | // tag_old should be klass - 4881222 |
aoqi@0 | 410 | if (! (tag_new.is_unresolved_klass() || tag_new.is_klass())) |
aoqi@0 | 411 | return false; |
aoqi@0 | 412 | if (_old_cp->klass_at_noresolve(cpi_old) != |
aoqi@0 | 413 | _new_cp->klass_at_noresolve(cpi_new)) |
aoqi@0 | 414 | return false; |
aoqi@0 | 415 | } else if (tag_old.is_method_type() && tag_new.is_method_type()) { |
aoqi@0 | 416 | int mti_old = _old_cp->method_type_index_at(cpi_old); |
aoqi@0 | 417 | int mti_new = _new_cp->method_type_index_at(cpi_new); |
aoqi@0 | 418 | if ((_old_cp->symbol_at(mti_old) != _new_cp->symbol_at(mti_new))) |
aoqi@0 | 419 | return false; |
aoqi@0 | 420 | } else if (tag_old.is_method_handle() && tag_new.is_method_handle()) { |
aoqi@0 | 421 | if (_old_cp->method_handle_ref_kind_at(cpi_old) != |
aoqi@0 | 422 | _new_cp->method_handle_ref_kind_at(cpi_new)) |
aoqi@0 | 423 | return false; |
aoqi@0 | 424 | int mhi_old = _old_cp->method_handle_index_at(cpi_old); |
aoqi@0 | 425 | int mhi_new = _new_cp->method_handle_index_at(cpi_new); |
aoqi@0 | 426 | if ((_old_cp->uncached_klass_ref_at_noresolve(mhi_old) != _new_cp->uncached_klass_ref_at_noresolve(mhi_new)) || |
aoqi@0 | 427 | (_old_cp->uncached_name_ref_at(mhi_old) != _new_cp->uncached_name_ref_at(mhi_new)) || |
aoqi@0 | 428 | (_old_cp->uncached_signature_ref_at(mhi_old) != _new_cp->uncached_signature_ref_at(mhi_new))) |
aoqi@0 | 429 | return false; |
aoqi@0 | 430 | } else { |
aoqi@0 | 431 | return false; // unknown tag |
aoqi@0 | 432 | } |
aoqi@0 | 433 | return true; |
aoqi@0 | 434 | } |
aoqi@0 | 435 | |
aoqi@0 | 436 | |
aoqi@0 | 437 | int MethodComparator::check_stack_and_locals_size(Method* old_method, Method* new_method) { |
aoqi@0 | 438 | if (old_method->max_stack() != new_method->max_stack()) { |
aoqi@0 | 439 | return 1; |
aoqi@0 | 440 | } else if (old_method->max_locals() != new_method->max_locals()) { |
aoqi@0 | 441 | return 2; |
aoqi@0 | 442 | } else if (old_method->size_of_parameters() != new_method->size_of_parameters()) { |
aoqi@0 | 443 | return 3; |
aoqi@0 | 444 | } else return 0; |
aoqi@0 | 445 | } |