Mercurial > hg > truffle
annotate src/share/vm/interpreter/rewriter.cpp @ 5343:20c14eb46238
added GraalOptions.CheckcastMinHintHitProbability to better guide use of hints for checkcasts
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 02 May 2012 17:09:00 +0200 |
parents | 723df37192d6 |
children | 957c266d8bc5 |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 1998, 2011, 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 "interpreter/bytecodes.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "interpreter/rewriter.hpp" | |
29 #include "memory/gcLocker.hpp" | |
30 #include "memory/oopFactory.hpp" | |
31 #include "memory/resourceArea.hpp" | |
32 #include "oops/generateOopMap.hpp" | |
33 #include "oops/objArrayOop.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "prims/methodComparator.hpp" | |
0 | 36 |
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37 // Computes a CPC map (new_index -> original_index) for constant pool entries |
0 | 38 // that are referred to by the interpreter at runtime via the constant pool cache. |
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39 // Also computes a CP map (original_index -> new_index). |
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40 // Marks entries in CP which require additional processing. |
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41 void Rewriter::compute_index_maps() { |
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42 const int length = _pool->length(); |
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43 init_cp_map(length); |
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44 jint tag_mask = 0; |
0 | 45 for (int i = 0; i < length; i++) { |
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46 int tag = _pool->tag_at(i).value(); |
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47 tag_mask |= (1 << tag); |
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48 switch (tag) { |
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49 case JVM_CONSTANT_InterfaceMethodref: |
0 | 50 case JVM_CONSTANT_Fieldref : // fall through |
51 case JVM_CONSTANT_Methodref : // fall through | |
1602 | 52 case JVM_CONSTANT_MethodHandle : // fall through |
53 case JVM_CONSTANT_MethodType : // fall through | |
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54 case JVM_CONSTANT_InvokeDynamic : // fall through |
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55 add_cp_cache_entry(i); |
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56 break; |
0 | 57 } |
58 } | |
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59 |
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60 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), |
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61 "all cp cache indexes fit in a u2"); |
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62 |
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63 _have_invoke_dynamic = ((tag_mask & (1 << JVM_CONSTANT_InvokeDynamic)) != 0); |
0 | 64 } |
65 | |
3404 | 66 // Unrewrite the bytecodes if an error occurs. |
67 void Rewriter::restore_bytecodes() { | |
68 int len = _methods->length(); | |
69 | |
70 for (int i = len-1; i >= 0; i--) { | |
71 methodOop method = (methodOop)_methods->obj_at(i); | |
72 scan_method(method, true); | |
73 } | |
74 } | |
0 | 75 |
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76 // Creates a constant pool cache given a CPC map |
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77 void Rewriter::make_constant_pool_cache(TRAPS) { |
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78 const int length = _cp_cache_map.length(); |
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79 constantPoolCacheOop cache = |
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80 oopFactory::new_constantPoolCache(length, CHECK); |
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81 No_Safepoint_Verifier nsv; |
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82 cache->initialize(_cp_cache_map); |
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83 |
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84 // Don't bother with the next pass if there is no JVM_CONSTANT_InvokeDynamic. |
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85 if (_have_invoke_dynamic) { |
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86 for (int i = 0; i < length; i++) { |
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87 int pool_index = cp_cache_entry_pool_index(i); |
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88 if (pool_index >= 0 && |
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89 _pool->tag_at(pool_index).is_invoke_dynamic()) { |
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90 int bsm_index = _pool->invoke_dynamic_bootstrap_method_ref_index_at(pool_index); |
2460 | 91 assert(_pool->tag_at(bsm_index).is_method_handle(), "must be a MH constant"); |
92 // There is a CP cache entry holding the BSM for these calls. | |
93 int bsm_cache_index = cp_entry_to_cp_cache(bsm_index); | |
94 cache->entry_at(i)->initialize_bootstrap_method_index_in_cache(bsm_cache_index); | |
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95 } |
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96 } |
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97 } |
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98 |
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99 _pool->set_cache(cache); |
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100 cache->set_constant_pool(_pool()); |
0 | 101 } |
102 | |
103 | |
104 | |
105 // The new finalization semantics says that registration of | |
106 // finalizable objects must be performed on successful return from the | |
107 // Object.<init> constructor. We could implement this trivially if | |
108 // <init> were never rewritten but since JVMTI allows this to occur, a | |
109 // more complicated solution is required. A special return bytecode | |
110 // is used only by Object.<init> to signal the finalization | |
111 // registration point. Additionally local 0 must be preserved so it's | |
112 // available to pass to the registration function. For simplicty we | |
113 // require that local 0 is never overwritten so it's available as an | |
114 // argument for registration. | |
115 | |
116 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { | |
117 RawBytecodeStream bcs(method); | |
118 while (!bcs.is_last_bytecode()) { | |
119 Bytecodes::Code opcode = bcs.raw_next(); | |
120 switch (opcode) { | |
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121 case Bytecodes::_return: |
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122 #ifndef GRAAL |
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123 *bcs.bcp() = Bytecodes::_return_register_finalizer; |
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124 #endif |
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125 break; |
0 | 126 |
127 case Bytecodes::_istore: | |
128 case Bytecodes::_lstore: | |
129 case Bytecodes::_fstore: | |
130 case Bytecodes::_dstore: | |
131 case Bytecodes::_astore: | |
132 if (bcs.get_index() != 0) continue; | |
133 | |
134 // fall through | |
135 case Bytecodes::_istore_0: | |
136 case Bytecodes::_lstore_0: | |
137 case Bytecodes::_fstore_0: | |
138 case Bytecodes::_dstore_0: | |
139 case Bytecodes::_astore_0: | |
140 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
141 "can't overwrite local 0 in Object.<init>"); | |
142 break; | |
143 } | |
144 } | |
145 } | |
146 | |
147 | |
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148 // Rewrite a classfile-order CP index into a native-order CPC index. |
3404 | 149 void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { |
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150 address p = bcp + offset; |
3404 | 151 if (!reverse) { |
152 int cp_index = Bytes::get_Java_u2(p); | |
153 int cache_index = cp_entry_to_cp_cache(cp_index); | |
154 Bytes::put_native_u2(p, cache_index); | |
155 } else { | |
156 int cache_index = Bytes::get_native_u2(p); | |
157 int pool_index = cp_cache_entry_pool_index(cache_index); | |
158 Bytes::put_Java_u2(p, pool_index); | |
159 } | |
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160 } |
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161 |
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162 |
3404 | 163 void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { |
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164 address p = bcp + offset; |
3404 | 165 assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); |
166 if (!reverse) { | |
167 int cp_index = Bytes::get_Java_u2(p); | |
168 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily | |
169 int cpc2 = add_secondary_cp_cache_entry(cpc); | |
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170 |
3404 | 171 // Replace the trailing four bytes with a CPC index for the dynamic |
172 // call site. Unlike other CPC entries, there is one per bytecode, | |
173 // not just one per distinct CP entry. In other words, the | |
174 // CPC-to-CP relation is many-to-one for invokedynamic entries. | |
175 // This means we must use a larger index size than u2 to address | |
176 // all these entries. That is the main reason invokedynamic | |
177 // must have a five-byte instruction format. (Of course, other JVM | |
178 // implementations can use the bytes for other purposes.) | |
179 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2)); | |
180 // Note: We use native_u4 format exclusively for 4-byte indexes. | |
181 } else { | |
182 int cache_index = constantPoolCacheOopDesc::decode_secondary_index( | |
183 Bytes::get_native_u4(p)); | |
184 int secondary_index = cp_cache_secondary_entry_main_index(cache_index); | |
185 int pool_index = cp_cache_entry_pool_index(secondary_index); | |
186 assert(_pool->tag_at(pool_index).is_invoke_dynamic(), "wrong index"); | |
187 // zero out 4 bytes | |
188 Bytes::put_Java_u4(p, 0); | |
189 Bytes::put_Java_u2(p, pool_index); | |
190 } | |
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191 } |
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192 |
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193 |
1602 | 194 // Rewrite some ldc bytecodes to _fast_aldc |
3404 | 195 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, |
196 bool reverse) { | |
197 if (!reverse) { | |
198 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); | |
199 address p = bcp + offset; | |
200 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
201 constantTag tag = _pool->tag_at(cp_index).value(); | |
202 if (tag.is_method_handle() || tag.is_method_type()) { | |
203 int cache_index = cp_entry_to_cp_cache(cp_index); | |
204 if (is_wide) { | |
205 (*bcp) = Bytecodes::_fast_aldc_w; | |
206 assert(cache_index == (u2)cache_index, "index overflow"); | |
207 Bytes::put_native_u2(p, cache_index); | |
208 } else { | |
209 (*bcp) = Bytecodes::_fast_aldc; | |
210 assert(cache_index == (u1)cache_index, "index overflow"); | |
211 (*p) = (u1)cache_index; | |
212 } | |
213 } | |
214 } else { | |
215 Bytecodes::Code rewritten_bc = | |
216 (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); | |
217 if ((*bcp) == rewritten_bc) { | |
218 address p = bcp + offset; | |
219 int cache_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); | |
220 int pool_index = cp_cache_entry_pool_index(cache_index); | |
221 if (is_wide) { | |
222 (*bcp) = Bytecodes::_ldc_w; | |
223 assert(pool_index == (u2)pool_index, "index overflow"); | |
224 Bytes::put_Java_u2(p, pool_index); | |
225 } else { | |
226 (*bcp) = Bytecodes::_ldc; | |
227 assert(pool_index == (u1)pool_index, "index overflow"); | |
228 (*p) = (u1)pool_index; | |
229 } | |
1602 | 230 } |
231 } | |
232 } | |
233 | |
234 | |
0 | 235 // Rewrites a method given the index_map information |
3404 | 236 void Rewriter::scan_method(methodOop method, bool reverse) { |
0 | 237 |
238 int nof_jsrs = 0; | |
239 bool has_monitor_bytecodes = false; | |
240 | |
241 { | |
242 // We cannot tolerate a GC in this block, because we've | |
243 // cached the bytecodes in 'code_base'. If the methodOop | |
244 // moves, the bytecodes will also move. | |
245 No_Safepoint_Verifier nsv; | |
246 Bytecodes::Code c; | |
247 | |
248 // Bytecodes and their length | |
249 const address code_base = method->code_base(); | |
250 const int code_length = method->code_size(); | |
251 | |
252 int bc_length; | |
253 for (int bci = 0; bci < code_length; bci += bc_length) { | |
254 address bcp = code_base + bci; | |
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255 int prefix_length = 0; |
0 | 256 c = (Bytecodes::Code)(*bcp); |
257 | |
258 // Since we have the code, see if we can get the length | |
259 // directly. Some more complicated bytecodes will report | |
260 // a length of zero, meaning we need to make another method | |
261 // call to calculate the length. | |
262 bc_length = Bytecodes::length_for(c); | |
263 if (bc_length == 0) { | |
2142 | 264 bc_length = Bytecodes::length_at(method, bcp); |
0 | 265 |
266 // length_at will put us at the bytecode after the one modified | |
267 // by 'wide'. We don't currently examine any of the bytecodes | |
268 // modified by wide, but in case we do in the future... | |
269 if (c == Bytecodes::_wide) { | |
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270 prefix_length = 1; |
0 | 271 c = (Bytecodes::Code)bcp[1]; |
272 } | |
273 } | |
274 | |
275 assert(bc_length != 0, "impossible bytecode length"); | |
276 | |
277 switch (c) { | |
278 case Bytecodes::_lookupswitch : { | |
279 #ifndef CC_INTERP | |
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280 #ifndef GRAAL |
2181 | 281 Bytecode_lookupswitch bc(method, bcp); |
1930 | 282 (*bcp) = ( |
2181 | 283 bc.number_of_pairs() < BinarySwitchThreshold |
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284 ? Bytecodes::_fast_linearswitch |
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285 : Bytecodes::_fast_binaryswitch |
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286 ); |
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287 #endif |
0 | 288 #endif |
289 break; | |
290 } | |
3404 | 291 case Bytecodes::_fast_linearswitch: |
292 case Bytecodes::_fast_binaryswitch: { | |
293 #ifndef CC_INTERP | |
294 (*bcp) = Bytecodes::_lookupswitch; | |
295 #endif | |
296 break; | |
297 } | |
0 | 298 case Bytecodes::_getstatic : // fall through |
299 case Bytecodes::_putstatic : // fall through | |
300 case Bytecodes::_getfield : // fall through | |
301 case Bytecodes::_putfield : // fall through | |
302 case Bytecodes::_invokevirtual : // fall through | |
303 case Bytecodes::_invokespecial : // fall through | |
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304 case Bytecodes::_invokestatic : |
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305 case Bytecodes::_invokeinterface: |
3404 | 306 rewrite_member_reference(bcp, prefix_length+1, reverse); |
0 | 307 break; |
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308 case Bytecodes::_invokedynamic: |
3404 | 309 rewrite_invokedynamic(bcp, prefix_length+1, reverse); |
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310 break; |
1602 | 311 case Bytecodes::_ldc: |
3404 | 312 case Bytecodes::_fast_aldc: |
313 maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); | |
1602 | 314 break; |
315 case Bytecodes::_ldc_w: | |
3404 | 316 case Bytecodes::_fast_aldc_w: |
317 maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); | |
1602 | 318 break; |
0 | 319 case Bytecodes::_jsr : // fall through |
320 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
321 case Bytecodes::_monitorenter : // fall through | |
322 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
323 } | |
324 } | |
325 } | |
326 | |
327 // Update access flags | |
328 if (has_monitor_bytecodes) { | |
329 method->set_has_monitor_bytecodes(); | |
330 } | |
331 | |
332 // The present of a jsr bytecode implies that the method might potentially | |
333 // have to be rewritten, so we run the oopMapGenerator on the method | |
334 if (nof_jsrs > 0) { | |
335 method->set_has_jsrs(); | |
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336 // Second pass will revisit this method. |
3404 | 337 assert(method->has_jsrs(), "didn't we just set this?"); |
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338 } |
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339 } |
0 | 340 |
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341 // After constant pool is created, revisit methods containing jsrs. |
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342 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
3404 | 343 ResourceMark rm(THREAD); |
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344 ResolveOopMapConflicts romc(method); |
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345 methodHandle original_method = method; |
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346 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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347 if (method() != original_method()) { |
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348 // Insert invalid bytecode into original methodOop and set |
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349 // interpreter entrypoint, so that a executing this method |
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350 // will manifest itself in an easy recognizable form. |
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351 address bcp = original_method->bcp_from(0); |
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352 *bcp = (u1)Bytecodes::_shouldnotreachhere; |
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353 int kind = Interpreter::method_kind(original_method); |
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354 original_method->set_interpreter_kind(kind); |
0 | 355 } |
356 | |
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357 // Update monitor matching info. |
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358 if (romc.monitor_safe()) { |
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359 method->set_guaranteed_monitor_matching(); |
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360 } |
0 | 361 |
362 return method; | |
363 } | |
364 | |
365 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
366 ResourceMark rm(THREAD); | |
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367 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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368 // (That's all, folks.) |
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369 } |
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370 |
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371 |
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372 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) { |
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373 ResourceMark rm(THREAD); |
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374 Rewriter rw(klass, cpool, methods, CHECK); |
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375 // (That's all, folks.) |
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376 } |
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377 |
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378 |
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379 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) |
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380 : _klass(klass), |
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381 _pool(cpool), |
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382 _methods(methods) |
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383 { |
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384 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
0 | 385 |
386 // determine index maps for methodOop rewriting | |
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387 compute_index_maps(); |
0 | 388 |
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389 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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390 bool did_rewrite = false; |
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391 int i = _methods->length(); |
0 | 392 while (i-- > 0) { |
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393 methodOop method = (methodOop)_methods->obj_at(i); |
0 | 394 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
395 // rewrite the return bytecodes of Object.<init> to register the | |
396 // object for finalization if needed. | |
397 methodHandle m(THREAD, method); | |
398 rewrite_Object_init(m, CHECK); | |
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399 did_rewrite = true; |
0 | 400 break; |
401 } | |
402 } | |
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403 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
0 | 404 } |
405 | |
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406 // rewrite methods, in two passes |
3404 | 407 int len = _methods->length(); |
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408 |
3404 | 409 for (int i = len-1; i >= 0; i--) { |
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410 methodOop method = (methodOop)_methods->obj_at(i); |
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411 scan_method(method); |
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412 } |
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413 |
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414 // allocate constant pool cache, now that we've seen all the bytecodes |
3404 | 415 make_constant_pool_cache(THREAD); |
416 | |
417 // Restore bytecodes to their unrewritten state if there are exceptions | |
418 // rewriting bytecodes or allocating the cpCache | |
419 if (HAS_PENDING_EXCEPTION) { | |
420 restore_bytecodes(); | |
421 return; | |
422 } | |
423 } | |
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424 |
3404 | 425 // Relocate jsr/rets in a method. This can't be done with the rewriter |
426 // stage because it can throw other exceptions, leaving the bytecodes | |
427 // pointing at constant pool cache entries. | |
428 // Link and check jvmti dependencies while we're iterating over the methods. | |
429 // JSR292 code calls with a different set of methods, so two entry points. | |
430 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, TRAPS) { | |
431 objArrayHandle methods(THREAD, this_oop->methods()); | |
432 relocate_and_link(this_oop, methods, THREAD); | |
433 } | |
434 | |
435 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, | |
436 objArrayHandle methods, TRAPS) { | |
437 int len = methods->length(); | |
438 for (int i = len-1; i >= 0; i--) { | |
439 methodHandle m(THREAD, (methodOop)methods->obj_at(i)); | |
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440 |
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441 if (m->has_jsrs()) { |
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442 m = rewrite_jsrs(m, CHECK); |
0 | 443 // Method might have gotten rewritten. |
3404 | 444 methods->obj_at_put(i, m()); |
0 | 445 } |
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446 |
3404 | 447 // Set up method entry points for compiler and interpreter . |
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448 m->link_method(m, CHECK); |
1574 | 449 |
3404 | 450 // This is for JVMTI and unrelated to relocator but the last thing we do |
1574 | 451 #ifdef ASSERT |
452 if (StressMethodComparator) { | |
453 static int nmc = 0; | |
454 for (int j = i; j >= 0 && j >= i-4; j--) { | |
455 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc); | |
3404 | 456 bool z = MethodComparator::methods_EMCP(m(), |
457 (methodOop)methods->obj_at(j)); | |
1574 | 458 if (j == i && !z) { |
459 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes(); | |
460 assert(z, "method must compare equal to itself"); | |
461 } | |
462 } | |
463 } | |
464 #endif //ASSERT | |
0 | 465 } |
466 } |