Mercurial > hg > truffle
annotate src/share/vm/interpreter/rewriter.cpp @ 4138:82af018d61db
Merge fixes.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Sat, 17 Dec 2011 22:03:44 +0100 |
| parents | 04b9a2566eec |
| children | 723df37192d6 |
| rev | line source |
|---|---|
| 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: if (!UseGraal) { *bcs.bcp() = Bytecodes::_return_register_finalizer; } break; |
| 0 | 122 |
| 123 case Bytecodes::_istore: | |
| 124 case Bytecodes::_lstore: | |
| 125 case Bytecodes::_fstore: | |
| 126 case Bytecodes::_dstore: | |
| 127 case Bytecodes::_astore: | |
| 128 if (bcs.get_index() != 0) continue; | |
| 129 | |
| 130 // fall through | |
| 131 case Bytecodes::_istore_0: | |
| 132 case Bytecodes::_lstore_0: | |
| 133 case Bytecodes::_fstore_0: | |
| 134 case Bytecodes::_dstore_0: | |
| 135 case Bytecodes::_astore_0: | |
| 136 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
| 137 "can't overwrite local 0 in Object.<init>"); | |
| 138 break; | |
| 139 } | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 | |
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144 // Rewrite a classfile-order CP index into a native-order CPC index. |
| 3404 | 145 void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { |
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146 address p = bcp + offset; |
| 3404 | 147 if (!reverse) { |
| 148 int cp_index = Bytes::get_Java_u2(p); | |
| 149 int cache_index = cp_entry_to_cp_cache(cp_index); | |
| 150 Bytes::put_native_u2(p, cache_index); | |
| 151 } else { | |
| 152 int cache_index = Bytes::get_native_u2(p); | |
| 153 int pool_index = cp_cache_entry_pool_index(cache_index); | |
| 154 Bytes::put_Java_u2(p, pool_index); | |
| 155 } | |
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156 } |
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157 |
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158 |
| 3404 | 159 void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { |
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160 address p = bcp + offset; |
| 3404 | 161 assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); |
| 162 if (!reverse) { | |
| 163 int cp_index = Bytes::get_Java_u2(p); | |
| 164 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily | |
| 165 int cpc2 = add_secondary_cp_cache_entry(cpc); | |
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166 |
| 3404 | 167 // Replace the trailing four bytes with a CPC index for the dynamic |
| 168 // call site. Unlike other CPC entries, there is one per bytecode, | |
| 169 // not just one per distinct CP entry. In other words, the | |
| 170 // CPC-to-CP relation is many-to-one for invokedynamic entries. | |
| 171 // This means we must use a larger index size than u2 to address | |
| 172 // all these entries. That is the main reason invokedynamic | |
| 173 // must have a five-byte instruction format. (Of course, other JVM | |
| 174 // implementations can use the bytes for other purposes.) | |
| 175 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2)); | |
| 176 // Note: We use native_u4 format exclusively for 4-byte indexes. | |
| 177 } else { | |
| 178 int cache_index = constantPoolCacheOopDesc::decode_secondary_index( | |
| 179 Bytes::get_native_u4(p)); | |
| 180 int secondary_index = cp_cache_secondary_entry_main_index(cache_index); | |
| 181 int pool_index = cp_cache_entry_pool_index(secondary_index); | |
| 182 assert(_pool->tag_at(pool_index).is_invoke_dynamic(), "wrong index"); | |
| 183 // zero out 4 bytes | |
| 184 Bytes::put_Java_u4(p, 0); | |
| 185 Bytes::put_Java_u2(p, pool_index); | |
| 186 } | |
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187 } |
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188 |
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189 |
| 1602 | 190 // Rewrite some ldc bytecodes to _fast_aldc |
| 3404 | 191 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, |
| 192 bool reverse) { | |
| 193 if (!reverse) { | |
| 194 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); | |
| 195 address p = bcp + offset; | |
| 196 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
| 197 constantTag tag = _pool->tag_at(cp_index).value(); | |
| 198 if (tag.is_method_handle() || tag.is_method_type()) { | |
| 199 int cache_index = cp_entry_to_cp_cache(cp_index); | |
| 200 if (is_wide) { | |
| 201 (*bcp) = Bytecodes::_fast_aldc_w; | |
| 202 assert(cache_index == (u2)cache_index, "index overflow"); | |
| 203 Bytes::put_native_u2(p, cache_index); | |
| 204 } else { | |
| 205 (*bcp) = Bytecodes::_fast_aldc; | |
| 206 assert(cache_index == (u1)cache_index, "index overflow"); | |
| 207 (*p) = (u1)cache_index; | |
| 208 } | |
| 209 } | |
| 210 } else { | |
| 211 Bytecodes::Code rewritten_bc = | |
| 212 (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); | |
| 213 if ((*bcp) == rewritten_bc) { | |
| 214 address p = bcp + offset; | |
| 215 int cache_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); | |
| 216 int pool_index = cp_cache_entry_pool_index(cache_index); | |
| 217 if (is_wide) { | |
| 218 (*bcp) = Bytecodes::_ldc_w; | |
| 219 assert(pool_index == (u2)pool_index, "index overflow"); | |
| 220 Bytes::put_Java_u2(p, pool_index); | |
| 221 } else { | |
| 222 (*bcp) = Bytecodes::_ldc; | |
| 223 assert(pool_index == (u1)pool_index, "index overflow"); | |
| 224 (*p) = (u1)pool_index; | |
| 225 } | |
| 1602 | 226 } |
| 227 } | |
| 228 } | |
| 229 | |
| 230 | |
| 0 | 231 // Rewrites a method given the index_map information |
| 3404 | 232 void Rewriter::scan_method(methodOop method, bool reverse) { |
| 0 | 233 |
| 234 int nof_jsrs = 0; | |
| 235 bool has_monitor_bytecodes = false; | |
| 236 | |
| 237 { | |
| 238 // We cannot tolerate a GC in this block, because we've | |
| 239 // cached the bytecodes in 'code_base'. If the methodOop | |
| 240 // moves, the bytecodes will also move. | |
| 241 No_Safepoint_Verifier nsv; | |
| 242 Bytecodes::Code c; | |
| 243 | |
| 244 // Bytecodes and their length | |
| 245 const address code_base = method->code_base(); | |
| 246 const int code_length = method->code_size(); | |
| 247 | |
| 248 int bc_length; | |
| 249 for (int bci = 0; bci < code_length; bci += bc_length) { | |
| 250 address bcp = code_base + bci; | |
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251 int prefix_length = 0; |
| 0 | 252 c = (Bytecodes::Code)(*bcp); |
| 253 | |
| 254 // Since we have the code, see if we can get the length | |
| 255 // directly. Some more complicated bytecodes will report | |
| 256 // a length of zero, meaning we need to make another method | |
| 257 // call to calculate the length. | |
| 258 bc_length = Bytecodes::length_for(c); | |
| 259 if (bc_length == 0) { | |
| 2142 | 260 bc_length = Bytecodes::length_at(method, bcp); |
| 0 | 261 |
| 262 // length_at will put us at the bytecode after the one modified | |
| 263 // by 'wide'. We don't currently examine any of the bytecodes | |
| 264 // modified by wide, but in case we do in the future... | |
| 265 if (c == Bytecodes::_wide) { | |
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266 prefix_length = 1; |
| 0 | 267 c = (Bytecodes::Code)bcp[1]; |
| 268 } | |
| 269 } | |
| 270 | |
| 271 assert(bc_length != 0, "impossible bytecode length"); | |
| 272 | |
| 273 switch (c) { | |
| 274 case Bytecodes::_lookupswitch : { | |
| 275 #ifndef CC_INTERP | |
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276 if (!UseGraal) { |
| 2181 | 277 Bytecode_lookupswitch bc(method, bcp); |
| 1930 | 278 (*bcp) = ( |
| 2181 | 279 bc.number_of_pairs() < BinarySwitchThreshold |
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280 ? Bytecodes::_fast_linearswitch |
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281 : Bytecodes::_fast_binaryswitch |
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282 ); |
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283 } |
| 0 | 284 #endif |
| 285 break; | |
| 286 } | |
| 3404 | 287 case Bytecodes::_fast_linearswitch: |
| 288 case Bytecodes::_fast_binaryswitch: { | |
| 289 #ifndef CC_INTERP | |
| 290 (*bcp) = Bytecodes::_lookupswitch; | |
| 291 #endif | |
| 292 break; | |
| 293 } | |
| 0 | 294 case Bytecodes::_getstatic : // fall through |
| 295 case Bytecodes::_putstatic : // fall through | |
| 296 case Bytecodes::_getfield : // fall through | |
| 297 case Bytecodes::_putfield : // fall through | |
| 298 case Bytecodes::_invokevirtual : // fall through | |
| 299 case Bytecodes::_invokespecial : // fall through | |
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300 case Bytecodes::_invokestatic : |
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301 case Bytecodes::_invokeinterface: |
| 3404 | 302 rewrite_member_reference(bcp, prefix_length+1, reverse); |
| 0 | 303 break; |
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304 case Bytecodes::_invokedynamic: |
| 3404 | 305 rewrite_invokedynamic(bcp, prefix_length+1, reverse); |
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306 break; |
| 1602 | 307 case Bytecodes::_ldc: |
| 3404 | 308 case Bytecodes::_fast_aldc: |
| 309 maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); | |
| 1602 | 310 break; |
| 311 case Bytecodes::_ldc_w: | |
| 3404 | 312 case Bytecodes::_fast_aldc_w: |
| 313 maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); | |
| 1602 | 314 break; |
| 0 | 315 case Bytecodes::_jsr : // fall through |
| 316 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
| 317 case Bytecodes::_monitorenter : // fall through | |
| 318 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
| 319 } | |
| 320 } | |
| 321 } | |
| 322 | |
| 323 // Update access flags | |
| 324 if (has_monitor_bytecodes) { | |
| 325 method->set_has_monitor_bytecodes(); | |
| 326 } | |
| 327 | |
| 328 // The present of a jsr bytecode implies that the method might potentially | |
| 329 // have to be rewritten, so we run the oopMapGenerator on the method | |
| 330 if (nof_jsrs > 0) { | |
| 331 method->set_has_jsrs(); | |
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332 // Second pass will revisit this method. |
| 3404 | 333 assert(method->has_jsrs(), "didn't we just set this?"); |
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334 } |
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335 } |
| 0 | 336 |
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337 // After constant pool is created, revisit methods containing jsrs. |
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338 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
| 3404 | 339 ResourceMark rm(THREAD); |
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340 ResolveOopMapConflicts romc(method); |
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341 methodHandle original_method = method; |
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342 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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343 if (method() != original_method()) { |
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344 // Insert invalid bytecode into original methodOop and set |
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345 // interpreter entrypoint, so that a executing this method |
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346 // will manifest itself in an easy recognizable form. |
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347 address bcp = original_method->bcp_from(0); |
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348 *bcp = (u1)Bytecodes::_shouldnotreachhere; |
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349 int kind = Interpreter::method_kind(original_method); |
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350 original_method->set_interpreter_kind(kind); |
| 0 | 351 } |
| 352 | |
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353 // Update monitor matching info. |
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354 if (romc.monitor_safe()) { |
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355 method->set_guaranteed_monitor_matching(); |
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356 } |
| 0 | 357 |
| 358 return method; | |
| 359 } | |
| 360 | |
| 361 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
| 362 ResourceMark rm(THREAD); | |
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363 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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364 // (That's all, folks.) |
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365 } |
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366 |
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367 |
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368 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) { |
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369 ResourceMark rm(THREAD); |
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370 Rewriter rw(klass, cpool, methods, CHECK); |
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371 // (That's all, folks.) |
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372 } |
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373 |
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374 |
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375 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) |
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376 : _klass(klass), |
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377 _pool(cpool), |
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378 _methods(methods) |
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379 { |
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380 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
| 0 | 381 |
| 382 // determine index maps for methodOop rewriting | |
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383 compute_index_maps(); |
| 0 | 384 |
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385 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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386 bool did_rewrite = false; |
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387 int i = _methods->length(); |
| 0 | 388 while (i-- > 0) { |
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389 methodOop method = (methodOop)_methods->obj_at(i); |
| 0 | 390 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
| 391 // rewrite the return bytecodes of Object.<init> to register the | |
| 392 // object for finalization if needed. | |
| 393 methodHandle m(THREAD, method); | |
| 394 rewrite_Object_init(m, CHECK); | |
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395 did_rewrite = true; |
| 0 | 396 break; |
| 397 } | |
| 398 } | |
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399 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
| 0 | 400 } |
| 401 | |
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402 // rewrite methods, in two passes |
| 3404 | 403 int len = _methods->length(); |
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404 |
| 3404 | 405 for (int i = len-1; i >= 0; i--) { |
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406 methodOop method = (methodOop)_methods->obj_at(i); |
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407 scan_method(method); |
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408 } |
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409 |
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410 // allocate constant pool cache, now that we've seen all the bytecodes |
| 3404 | 411 make_constant_pool_cache(THREAD); |
| 412 | |
| 413 // Restore bytecodes to their unrewritten state if there are exceptions | |
| 414 // rewriting bytecodes or allocating the cpCache | |
| 415 if (HAS_PENDING_EXCEPTION) { | |
| 416 restore_bytecodes(); | |
| 417 return; | |
| 418 } | |
| 419 } | |
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420 |
| 3404 | 421 // Relocate jsr/rets in a method. This can't be done with the rewriter |
| 422 // stage because it can throw other exceptions, leaving the bytecodes | |
| 423 // pointing at constant pool cache entries. | |
| 424 // Link and check jvmti dependencies while we're iterating over the methods. | |
| 425 // JSR292 code calls with a different set of methods, so two entry points. | |
| 426 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, TRAPS) { | |
| 427 objArrayHandle methods(THREAD, this_oop->methods()); | |
| 428 relocate_and_link(this_oop, methods, THREAD); | |
| 429 } | |
| 430 | |
| 431 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, | |
| 432 objArrayHandle methods, TRAPS) { | |
| 433 int len = methods->length(); | |
| 434 for (int i = len-1; i >= 0; i--) { | |
| 435 methodHandle m(THREAD, (methodOop)methods->obj_at(i)); | |
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436 |
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437 if (m->has_jsrs()) { |
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438 m = rewrite_jsrs(m, CHECK); |
| 0 | 439 // Method might have gotten rewritten. |
| 3404 | 440 methods->obj_at_put(i, m()); |
| 0 | 441 } |
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442 |
| 3404 | 443 // Set up method entry points for compiler and interpreter . |
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444 m->link_method(m, CHECK); |
| 1574 | 445 |
| 3404 | 446 // This is for JVMTI and unrelated to relocator but the last thing we do |
| 1574 | 447 #ifdef ASSERT |
| 448 if (StressMethodComparator) { | |
| 449 static int nmc = 0; | |
| 450 for (int j = i; j >= 0 && j >= i-4; j--) { | |
| 451 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc); | |
| 3404 | 452 bool z = MethodComparator::methods_EMCP(m(), |
| 453 (methodOop)methods->obj_at(j)); | |
| 1574 | 454 if (j == i && !z) { |
| 455 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes(); | |
| 456 assert(z, "method must compare equal to itself"); | |
| 457 } | |
| 458 } | |
| 459 } | |
| 460 #endif //ASSERT | |
| 0 | 461 } |
| 462 } |