Mercurial > hg > truffle
annotate src/share/vm/prims/methodComparator.cpp @ 14702:d4dd5204c0aa
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author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
parents | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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 "oops/oop.inline.hpp" | |
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27 #include "oops/symbol.hpp" |
1972 | 28 #include "prims/jvmtiRedefineClassesTrace.hpp" |
29 #include "prims/methodComparator.hpp" | |
30 #include "runtime/handles.inline.hpp" | |
31 #include "utilities/globalDefinitions.hpp" | |
0 | 32 |
33 BytecodeStream *MethodComparator::_s_old; | |
34 BytecodeStream *MethodComparator::_s_new; | |
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35 ConstantPool* MethodComparator::_old_cp; |
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36 ConstantPool* MethodComparator::_new_cp; |
0 | 37 BciMap *MethodComparator::_bci_map; |
38 bool MethodComparator::_switchable_test; | |
39 GrowableArray<int> *MethodComparator::_fwd_jmps; | |
40 | |
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41 bool MethodComparator::methods_EMCP(Method* old_method, Method* new_method) { |
0 | 42 if (old_method->code_size() != new_method->code_size()) |
43 return false; | |
44 if (check_stack_and_locals_size(old_method, new_method) != 0) { | |
45 // RC_TRACE macro has an embedded ResourceMark | |
46 RC_TRACE(0x00800000, ("Methods %s non-comparable with diagnosis %d", | |
47 old_method->name()->as_C_string(), | |
48 check_stack_and_locals_size(old_method, new_method))); | |
49 return false; | |
50 } | |
51 | |
52 _old_cp = old_method->constants(); | |
53 _new_cp = new_method->constants(); | |
54 BytecodeStream s_old(old_method); | |
55 BytecodeStream s_new(new_method); | |
56 _s_old = &s_old; | |
57 _s_new = &s_new; | |
58 _switchable_test = false; | |
59 Bytecodes::Code c_old, c_new; | |
60 | |
61 while ((c_old = s_old.next()) >= 0) { | |
62 if ((c_new = s_new.next()) < 0 || c_old != c_new) | |
63 return false; | |
64 | |
65 if (! args_same(c_old, c_new)) | |
66 return false; | |
67 } | |
68 return true; | |
69 } | |
70 | |
71 | |
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72 bool MethodComparator::methods_switchable(Method* old_method, Method* new_method, |
0 | 73 BciMap &bci_map) { |
74 if (old_method->code_size() > new_method->code_size()) | |
75 // Something has definitely been deleted in the new method, compared to the old one. | |
76 return false; | |
77 | |
78 if (! check_stack_and_locals_size(old_method, new_method)) | |
79 return false; | |
80 | |
81 _old_cp = old_method->constants(); | |
82 _new_cp = new_method->constants(); | |
83 BytecodeStream s_old(old_method); | |
84 BytecodeStream s_new(new_method); | |
85 _s_old = &s_old; | |
86 _s_new = &s_new; | |
87 _bci_map = &bci_map; | |
88 _switchable_test = true; | |
89 GrowableArray<int> fwd_jmps(16); | |
90 _fwd_jmps = &fwd_jmps; | |
91 Bytecodes::Code c_old, c_new; | |
92 | |
93 while ((c_old = s_old.next()) >= 0) { | |
94 if ((c_new = s_new.next()) < 0) | |
95 return false; | |
96 if (! (c_old == c_new && args_same(c_old, c_new))) { | |
97 int old_bci = s_old.bci(); | |
98 int new_st_bci = s_new.bci(); | |
99 bool found_match = false; | |
100 do { | |
101 c_new = s_new.next(); | |
102 if (c_new == c_old && args_same(c_old, c_new)) { | |
103 found_match = true; | |
104 break; | |
105 } | |
106 } while (c_new >= 0); | |
107 if (! found_match) | |
108 return false; | |
109 int new_end_bci = s_new.bci(); | |
110 bci_map.store_fragment_location(old_bci, new_st_bci, new_end_bci); | |
111 } | |
112 } | |
113 | |
114 // Now we can test all forward jumps | |
115 for (int i = 0; i < fwd_jmps.length() / 2; i++) { | |
116 if (! bci_map.old_and_new_locations_same(fwd_jmps.at(i*2), fwd_jmps.at(i*2+1))) { | |
117 RC_TRACE(0x00800000, | |
118 ("Fwd jump miss: old dest = %d, calc new dest = %d, act new dest = %d", | |
119 fwd_jmps.at(i*2), bci_map.new_bci_for_old(fwd_jmps.at(i*2)), | |
120 fwd_jmps.at(i*2+1))); | |
121 return false; | |
122 } | |
123 } | |
124 | |
125 return true; | |
126 } | |
127 | |
128 | |
129 bool MethodComparator::args_same(Bytecodes::Code c_old, Bytecodes::Code c_new) { | |
130 // BytecodeStream returns the correct standard Java bytecodes for various "fast" | |
131 // bytecode versions, so we don't have to bother about them here.. | |
132 switch (c_old) { | |
133 case Bytecodes::_new : // fall through | |
134 case Bytecodes::_anewarray : // fall through | |
135 case Bytecodes::_multianewarray : // fall through | |
136 case Bytecodes::_checkcast : // fall through | |
137 case Bytecodes::_instanceof : { | |
1565 | 138 u2 cpi_old = _s_old->get_index_u2(); |
139 u2 cpi_new = _s_new->get_index_u2(); | |
0 | 140 if ((_old_cp->klass_at_noresolve(cpi_old) != _new_cp->klass_at_noresolve(cpi_new))) |
141 return false; | |
142 if (c_old == Bytecodes::_multianewarray && | |
143 *(jbyte*)(_s_old->bcp() + 3) != *(jbyte*)(_s_new->bcp() + 3)) | |
144 return false; | |
145 break; | |
146 } | |
147 | |
148 case Bytecodes::_getstatic : // fall through | |
149 case Bytecodes::_putstatic : // fall through | |
150 case Bytecodes::_getfield : // fall through | |
151 case Bytecodes::_putfield : // fall through | |
152 case Bytecodes::_invokevirtual : // fall through | |
153 case Bytecodes::_invokespecial : // fall through | |
154 case Bytecodes::_invokestatic : // fall through | |
155 case Bytecodes::_invokeinterface : { | |
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156 int cpci_old = _s_old->get_index_u2_cpcache(); |
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157 int cpci_new = _s_new->get_index_u2_cpcache(); |
0 | 158 // Check if the names of classes, field/method names and signatures at these indexes |
159 // are the same. Indices which are really into constantpool cache (rather than constant | |
160 // pool itself) are accepted by the constantpool query routines below. | |
161 if ((_old_cp->klass_ref_at_noresolve(cpci_old) != _new_cp->klass_ref_at_noresolve(cpci_new)) || | |
162 (_old_cp->name_ref_at(cpci_old) != _new_cp->name_ref_at(cpci_new)) || | |
163 (_old_cp->signature_ref_at(cpci_old) != _new_cp->signature_ref_at(cpci_new))) | |
164 return false; | |
165 break; | |
166 } | |
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167 case Bytecodes::_invokedynamic: { |
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168 int cpci_old = _s_old->get_index_u4(); |
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169 int cpci_new = _s_new->get_index_u4(); |
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170 |
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171 // Check if the names of classes, field/method names and signatures at these indexes |
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172 // are the same. Indices which are really into constantpool cache (rather than constant |
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173 // pool itself) are accepted by the constantpool query routines below. |
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174 if ((_old_cp->name_ref_at(cpci_old) != _new_cp->name_ref_at(cpci_new)) || |
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175 (_old_cp->signature_ref_at(cpci_old) != _new_cp->signature_ref_at(cpci_new))) |
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176 return false; |
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177 |
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178 // Translate object indexes to constant pool cache indexes. |
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179 cpci_old = _old_cp->invokedynamic_cp_cache_index(cpci_old); |
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180 cpci_new = _new_cp->invokedynamic_cp_cache_index(cpci_new); |
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181 |
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182 int cpi_old = _old_cp->cache()->entry_at(cpci_old)->constant_pool_index(); |
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183 int cpi_new = _new_cp->cache()->entry_at(cpci_new)->constant_pool_index(); |
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184 int bsm_old = _old_cp->invoke_dynamic_bootstrap_method_ref_index_at(cpi_old); |
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185 int bsm_new = _new_cp->invoke_dynamic_bootstrap_method_ref_index_at(cpi_new); |
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186 if (!pool_constants_same(bsm_old, bsm_new)) |
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187 return false; |
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188 int cnt_old = _old_cp->invoke_dynamic_argument_count_at(cpi_old); |
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189 int cnt_new = _new_cp->invoke_dynamic_argument_count_at(cpi_new); |
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190 if (cnt_old != cnt_new) |
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191 return false; |
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192 for (int arg_i = 0; arg_i < cnt_old; arg_i++) { |
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193 int idx_old = _old_cp->invoke_dynamic_argument_index_at(cpi_old, arg_i); |
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194 int idx_new = _new_cp->invoke_dynamic_argument_index_at(cpi_new, arg_i); |
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195 if (!pool_constants_same(idx_old, idx_new)) |
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196 return false; |
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197 } |
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198 break; |
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199 } |
0 | 200 |
201 case Bytecodes::_ldc : // fall through | |
202 case Bytecodes::_ldc_w : { | |
2142 | 203 Bytecode_loadconstant ldc_old(_s_old->method(), _s_old->bci()); |
204 Bytecode_loadconstant ldc_new(_s_new->method(), _s_new->bci()); | |
205 int cpi_old = ldc_old.pool_index(); | |
206 int cpi_new = ldc_new.pool_index(); | |
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207 if (!pool_constants_same(cpi_old, cpi_new)) |
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208 return false; |
0 | 209 break; |
210 } | |
211 | |
212 case Bytecodes::_ldc2_w : { | |
1565 | 213 u2 cpi_old = _s_old->get_index_u2(); |
214 u2 cpi_new = _s_new->get_index_u2(); | |
0 | 215 constantTag tag_old = _old_cp->tag_at(cpi_old); |
216 constantTag tag_new = _new_cp->tag_at(cpi_new); | |
217 if (tag_old.value() != tag_new.value()) | |
218 return false; | |
219 if (tag_old.is_long()) { | |
220 if (_old_cp->long_at(cpi_old) != _new_cp->long_at(cpi_new)) | |
221 return false; | |
222 } else { | |
1574 | 223 // Use jlong_cast to compare the bits rather than numerical values. |
224 // This makes a difference for NaN constants. | |
225 if (jlong_cast(_old_cp->double_at(cpi_old)) != jlong_cast(_new_cp->double_at(cpi_new))) | |
0 | 226 return false; |
227 } | |
228 break; | |
229 } | |
230 | |
231 case Bytecodes::_bipush : | |
232 if (_s_old->bcp()[1] != _s_new->bcp()[1]) | |
233 return false; | |
234 break; | |
235 | |
236 case Bytecodes::_sipush : | |
1565 | 237 if (_s_old->get_index_u2() != _s_new->get_index_u2()) |
0 | 238 return false; |
239 break; | |
240 | |
241 case Bytecodes::_aload : // fall through | |
242 case Bytecodes::_astore : // fall through | |
243 case Bytecodes::_dload : // fall through | |
244 case Bytecodes::_dstore : // fall through | |
245 case Bytecodes::_fload : // fall through | |
246 case Bytecodes::_fstore : // fall through | |
247 case Bytecodes::_iload : // fall through | |
248 case Bytecodes::_istore : // fall through | |
249 case Bytecodes::_lload : // fall through | |
250 case Bytecodes::_lstore : // fall through | |
251 case Bytecodes::_ret : | |
252 if (_s_old->is_wide() != _s_new->is_wide()) | |
253 return false; | |
254 if (_s_old->get_index() != _s_new->get_index()) | |
255 return false; | |
256 break; | |
257 | |
258 case Bytecodes::_goto : // fall through | |
259 case Bytecodes::_if_acmpeq : // fall through | |
260 case Bytecodes::_if_acmpne : // fall through | |
261 case Bytecodes::_if_icmpeq : // fall through | |
262 case Bytecodes::_if_icmpne : // fall through | |
263 case Bytecodes::_if_icmplt : // fall through | |
264 case Bytecodes::_if_icmpge : // fall through | |
265 case Bytecodes::_if_icmpgt : // fall through | |
266 case Bytecodes::_if_icmple : // fall through | |
267 case Bytecodes::_ifeq : // fall through | |
268 case Bytecodes::_ifne : // fall through | |
269 case Bytecodes::_iflt : // fall through | |
270 case Bytecodes::_ifge : // fall through | |
271 case Bytecodes::_ifgt : // fall through | |
272 case Bytecodes::_ifle : // fall through | |
273 case Bytecodes::_ifnonnull : // fall through | |
274 case Bytecodes::_ifnull : // fall through | |
275 case Bytecodes::_jsr : { | |
2142 | 276 int old_ofs = _s_old->bytecode().get_offset_s2(c_old); |
277 int new_ofs = _s_new->bytecode().get_offset_s2(c_new); | |
0 | 278 if (_switchable_test) { |
279 int old_dest = _s_old->bci() + old_ofs; | |
280 int new_dest = _s_new->bci() + new_ofs; | |
281 if (old_ofs < 0 && new_ofs < 0) { | |
282 if (! _bci_map->old_and_new_locations_same(old_dest, new_dest)) | |
283 return false; | |
284 } else if (old_ofs > 0 && new_ofs > 0) { | |
285 _fwd_jmps->append(old_dest); | |
286 _fwd_jmps->append(new_dest); | |
287 } else { | |
288 return false; | |
289 } | |
290 } else { | |
291 if (old_ofs != new_ofs) | |
292 return false; | |
293 } | |
294 break; | |
295 } | |
296 | |
297 case Bytecodes::_iinc : | |
298 if (_s_old->is_wide() != _s_new->is_wide()) | |
299 return false; | |
300 if (! _s_old->is_wide()) { | |
1565 | 301 // We could use get_index_u1 and get_constant_u1, but it's simpler to grab both bytes at once: |
302 if (Bytes::get_Java_u2(_s_old->bcp() + 1) != Bytes::get_Java_u2(_s_new->bcp() + 1)) | |
0 | 303 return false; |
304 } else { | |
1565 | 305 // We could use get_index_u2 and get_constant_u2, but it's simpler to grab all four bytes at once: |
0 | 306 if (Bytes::get_Java_u4(_s_old->bcp() + 1) != Bytes::get_Java_u4(_s_new->bcp() + 1)) |
307 return false; | |
308 } | |
309 break; | |
310 | |
311 case Bytecodes::_goto_w : // fall through | |
312 case Bytecodes::_jsr_w : { | |
2142 | 313 int old_ofs = _s_old->bytecode().get_offset_s4(c_old); |
314 int new_ofs = _s_new->bytecode().get_offset_s4(c_new); | |
0 | 315 if (_switchable_test) { |
316 int old_dest = _s_old->bci() + old_ofs; | |
317 int new_dest = _s_new->bci() + new_ofs; | |
318 if (old_ofs < 0 && new_ofs < 0) { | |
319 if (! _bci_map->old_and_new_locations_same(old_dest, new_dest)) | |
320 return false; | |
321 } else if (old_ofs > 0 && new_ofs > 0) { | |
322 _fwd_jmps->append(old_dest); | |
323 _fwd_jmps->append(new_dest); | |
324 } else { | |
325 return false; | |
326 } | |
327 } else { | |
328 if (old_ofs != new_ofs) | |
329 return false; | |
330 } | |
331 break; | |
332 } | |
333 | |
334 case Bytecodes::_lookupswitch : // fall through | |
335 case Bytecodes::_tableswitch : { | |
336 if (_switchable_test) { | |
337 address aligned_bcp_old = (address) round_to((intptr_t)_s_old->bcp() + 1, jintSize); | |
338 address aligned_bcp_new = (address) round_to((intptr_t)_s_new->bcp() + 1, jintSize); | |
339 int default_old = (int) Bytes::get_Java_u4(aligned_bcp_old); | |
340 int default_new = (int) Bytes::get_Java_u4(aligned_bcp_new); | |
341 _fwd_jmps->append(_s_old->bci() + default_old); | |
342 _fwd_jmps->append(_s_new->bci() + default_new); | |
343 if (c_old == Bytecodes::_lookupswitch) { | |
344 int npairs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize); | |
345 int npairs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize); | |
346 if (npairs_old != npairs_new) | |
347 return false; | |
348 for (int i = 0; i < npairs_old; i++) { | |
349 int match_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i)*jintSize); | |
350 int match_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i)*jintSize); | |
351 if (match_old != match_new) | |
352 return false; | |
353 int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i+1)*jintSize); | |
354 int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i+1)*jintSize); | |
355 _fwd_jmps->append(_s_old->bci() + ofs_old); | |
356 _fwd_jmps->append(_s_new->bci() + ofs_new); | |
357 } | |
358 } else if (c_old == Bytecodes::_tableswitch) { | |
359 int lo_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize); | |
360 int lo_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize); | |
361 if (lo_old != lo_new) | |
362 return false; | |
363 int hi_old = (int) Bytes::get_Java_u4(aligned_bcp_old + 2*jintSize); | |
364 int hi_new = (int) Bytes::get_Java_u4(aligned_bcp_new + 2*jintSize); | |
365 if (hi_old != hi_new) | |
366 return false; | |
367 for (int i = 0; i < hi_old - lo_old + 1; i++) { | |
368 int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (3+i)*jintSize); | |
369 int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (3+i)*jintSize); | |
370 _fwd_jmps->append(_s_old->bci() + ofs_old); | |
371 _fwd_jmps->append(_s_new->bci() + ofs_new); | |
372 } | |
373 } | |
374 } else { // !_switchable_test, can use fast rough compare | |
1565 | 375 int len_old = _s_old->instruction_size(); |
376 int len_new = _s_new->instruction_size(); | |
0 | 377 if (len_old != len_new) |
378 return false; | |
379 if (memcmp(_s_old->bcp(), _s_new->bcp(), len_old) != 0) | |
380 return false; | |
381 } | |
382 break; | |
383 } | |
384 } | |
385 | |
386 return true; | |
387 } | |
388 | |
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389 bool MethodComparator::pool_constants_same(int cpi_old, int cpi_new) { |
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390 constantTag tag_old = _old_cp->tag_at(cpi_old); |
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391 constantTag tag_new = _new_cp->tag_at(cpi_new); |
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392 if (tag_old.is_int() || tag_old.is_float()) { |
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393 if (tag_old.value() != tag_new.value()) |
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394 return false; |
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395 if (tag_old.is_int()) { |
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396 if (_old_cp->int_at(cpi_old) != _new_cp->int_at(cpi_new)) |
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397 return false; |
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398 } else { |
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399 // Use jint_cast to compare the bits rather than numerical values. |
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400 // This makes a difference for NaN constants. |
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401 if (jint_cast(_old_cp->float_at(cpi_old)) != jint_cast(_new_cp->float_at(cpi_new))) |
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402 return false; |
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403 } |
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404 } else if (tag_old.is_string() && tag_new.is_string()) { |
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405 if (strcmp(_old_cp->string_at_noresolve(cpi_old), |
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406 _new_cp->string_at_noresolve(cpi_new)) != 0) |
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407 return false; |
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408 } else if (tag_old.is_klass() || tag_old.is_unresolved_klass()) { |
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409 // tag_old should be klass - 4881222 |
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410 if (! (tag_new.is_unresolved_klass() || tag_new.is_klass())) |
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411 return false; |
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412 if (_old_cp->klass_at_noresolve(cpi_old) != |
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413 _new_cp->klass_at_noresolve(cpi_new)) |
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414 return false; |
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415 } else if (tag_old.is_method_type() && tag_new.is_method_type()) { |
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416 int mti_old = _old_cp->method_type_index_at(cpi_old); |
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417 int mti_new = _new_cp->method_type_index_at(cpi_new); |
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418 if ((_old_cp->symbol_at(mti_old) != _new_cp->symbol_at(mti_new))) |
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419 return false; |
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420 } else if (tag_old.is_method_handle() && tag_new.is_method_handle()) { |
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421 if (_old_cp->method_handle_ref_kind_at(cpi_old) != |
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422 _new_cp->method_handle_ref_kind_at(cpi_new)) |
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423 return false; |
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424 int mhi_old = _old_cp->method_handle_index_at(cpi_old); |
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425 int mhi_new = _new_cp->method_handle_index_at(cpi_new); |
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426 if ((_old_cp->uncached_klass_ref_at_noresolve(mhi_old) != _new_cp->uncached_klass_ref_at_noresolve(mhi_new)) || |
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427 (_old_cp->uncached_name_ref_at(mhi_old) != _new_cp->uncached_name_ref_at(mhi_new)) || |
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428 (_old_cp->uncached_signature_ref_at(mhi_old) != _new_cp->uncached_signature_ref_at(mhi_new))) |
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429 return false; |
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430 } else { |
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431 return false; // unknown tag |
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432 } |
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433 return true; |
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434 } |
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435 |
0 | 436 |
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437 int MethodComparator::check_stack_and_locals_size(Method* old_method, Method* new_method) { |
0 | 438 if (old_method->max_stack() != new_method->max_stack()) { |
439 return 1; | |
440 } else if (old_method->max_locals() != new_method->max_locals()) { | |
441 return 2; | |
442 } else if (old_method->size_of_parameters() != new_method->size_of_parameters()) { | |
443 return 3; | |
444 } else return 0; | |
445 } |