Mercurial > hg > truffle
annotate src/share/vm/ci/ciStreams.hpp @ 17467:55fb97c4c58d hs25-b65
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
Summary: Copyright year updated for files modified during 2013
Reviewed-by: twisti, iveresov
| author | mikael |
|---|---|
| date | Tue, 24 Dec 2013 11:48:39 -0800 |
| parents | d13d7aba8c12 |
| children | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2013, 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 #ifndef SHARE_VM_CI_CISTREAMS_HPP |
| 26 #define SHARE_VM_CI_CISTREAMS_HPP | |
| 27 | |
| 28 #include "ci/ciClassList.hpp" | |
| 29 #include "ci/ciExceptionHandler.hpp" | |
| 30 #include "ci/ciInstanceKlass.hpp" | |
| 31 #include "ci/ciMethod.hpp" | |
| 32 #include "interpreter/bytecode.hpp" | |
| 33 | |
| 0 | 34 // ciBytecodeStream |
| 35 // | |
| 36 // The class is used to iterate over the bytecodes of a method. | |
| 37 // It hides the details of constant pool structure/access by | |
| 38 // providing accessors for constant pool items. It returns only pure | |
| 39 // Java bytecodes; VM-internal _fast bytecodes are translated back to | |
| 40 // their original form during iteration. | |
| 41 class ciBytecodeStream : StackObj { | |
| 42 private: | |
| 1565 | 43 // Handling for the weird bytecodes |
| 44 Bytecodes::Code next_wide_or_table(Bytecodes::Code); // Handle _wide & complicated inline table | |
| 0 | 45 |
| 46 static Bytecodes::Code check_java(Bytecodes::Code c) { | |
| 47 assert(Bytecodes::is_java_code(c), "should not return _fast bytecodes"); | |
| 48 return c; | |
| 49 } | |
| 50 | |
| 1565 | 51 static Bytecodes::Code check_defined(Bytecodes::Code c) { |
| 52 assert(Bytecodes::is_defined(c), ""); | |
| 53 return c; | |
| 54 } | |
| 55 | |
| 0 | 56 ciMethod* _method; // the method |
| 57 ciInstanceKlass* _holder; | |
| 58 address _bc_start; // Start of current bytecode for table | |
| 59 address _was_wide; // Address past last wide bytecode | |
| 60 jint* _table_base; // Aligned start of last table or switch | |
| 61 | |
| 62 address _start; // Start of bytecodes | |
| 63 address _end; // Past end of bytecodes | |
| 64 address _pc; // Current PC | |
| 65 Bytecodes::Code _bc; // Current bytecode | |
| 1565 | 66 Bytecodes::Code _raw_bc; // Current bytecode, raw form |
| 0 | 67 |
| 68 void reset( address base, unsigned int size ) { | |
| 69 _bc_start =_was_wide = 0; | |
| 1602 | 70 _start = _pc = base; _end = base + size; |
| 71 } | |
| 0 | 72 |
| 1565 | 73 void assert_wide(bool require_wide) const { |
| 74 if (require_wide) | |
| 75 { assert(is_wide(), "must be a wide instruction"); } | |
| 76 else { assert(!is_wide(), "must not be a wide instruction"); } | |
| 77 } | |
| 78 | |
| 2142 | 79 Bytecode bytecode() const { return Bytecode(this, _bc_start); } |
| 80 Bytecode next_bytecode() const { return Bytecode(this, _pc); } | |
| 1565 | 81 |
| 0 | 82 public: |
| 83 // End-Of-Bytecodes | |
| 84 static Bytecodes::Code EOBC() { | |
| 85 return Bytecodes::_illegal; | |
| 86 } | |
| 87 | |
| 88 ciBytecodeStream(ciMethod* m) { | |
| 89 reset_to_method(m); | |
| 90 } | |
| 91 | |
| 92 ciBytecodeStream() { | |
| 93 reset_to_method(NULL); | |
| 94 } | |
| 95 | |
| 96 ciMethod* method() const { return _method; } | |
| 97 | |
| 98 void reset_to_method(ciMethod* m) { | |
| 99 _method = m; | |
| 100 if (m == NULL) { | |
| 101 _holder = NULL; | |
| 102 reset(NULL, 0); | |
| 103 } else { | |
| 104 _holder = m->holder(); | |
| 105 reset(m->code(), m->code_size()); | |
| 106 } | |
| 107 } | |
| 108 | |
| 109 void reset_to_bci( int bci ); | |
| 110 | |
| 111 // Force the iterator to report a certain bci. | |
| 112 void force_bci(int bci); | |
| 113 | |
| 114 void set_max_bci( int max ) { | |
| 115 _end = _start + max; | |
| 116 } | |
| 117 | |
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118 address cur_bcp() const { return _bc_start; } // Returns bcp to current instruction |
| 1565 | 119 int next_bci() const { return _pc - _start; } |
| 0 | 120 int cur_bci() const { return _bc_start - _start; } |
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121 int instruction_size() const { return _pc - _bc_start; } |
| 0 | 122 |
| 123 Bytecodes::Code cur_bc() const{ return check_java(_bc); } | |
| 1565 | 124 Bytecodes::Code cur_bc_raw() const { return check_defined(_raw_bc); } |
| 0 | 125 Bytecodes::Code next_bc() { return Bytecodes::java_code((Bytecodes::Code)* _pc); } |
| 126 | |
| 127 // Return current ByteCode and increment PC to next bytecode, skipping all | |
| 128 // intermediate constants. Returns EOBC at end. | |
| 129 // Expected usage: | |
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130 // ciBytecodeStream iter(m); |
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131 // while (iter.next() != ciBytecodeStream::EOBC()) { ... } |
| 0 | 132 Bytecodes::Code next() { |
| 133 _bc_start = _pc; // Capture start of bc | |
| 134 if( _pc >= _end ) return EOBC(); // End-Of-Bytecodes | |
| 135 | |
| 136 // Fetch Java bytecode | |
| 137 // All rewritten bytecodes maintain the size of original bytecode. | |
| 1565 | 138 _bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)*_pc); |
| 0 | 139 int csize = Bytecodes::length_for(_bc); // Expected size |
| 1565 | 140 _pc += csize; // Bump PC past bytecode |
| 141 if (csize == 0) { | |
| 142 _bc = next_wide_or_table(_bc); | |
| 0 | 143 } |
| 144 return check_java(_bc); | |
| 145 } | |
| 146 | |
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147 bool is_wide() const { return ( _pc == _was_wide ); } |
| 0 | 148 |
| 1565 | 149 // Does this instruction contain an index which refes into the CP cache? |
| 1602 | 150 bool has_cache_index() const { return Bytecodes::uses_cp_cache(cur_bc_raw()); } |
| 1565 | 151 |
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152 bool has_optional_appendix() { return Bytecodes::has_optional_appendix(cur_bc_raw()); } |
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153 |
| 1565 | 154 int get_index_u1() const { |
| 2142 | 155 return bytecode().get_index_u1(cur_bc_raw()); |
| 1565 | 156 } |
| 157 | |
| 1602 | 158 int get_index_u1_cpcache() const { |
| 2142 | 159 return bytecode().get_index_u1_cpcache(cur_bc_raw()); |
| 1602 | 160 } |
| 161 | |
| 0 | 162 // Get a byte index following this bytecode. |
| 163 // If prefixed with a wide bytecode, get a wide index. | |
| 164 int get_index() const { | |
| 1602 | 165 assert(!has_cache_index(), "else use cpcache variant"); |
| 0 | 166 return (_pc == _was_wide) // was widened? |
| 1565 | 167 ? get_index_u2(true) // yes, return wide index |
| 168 : get_index_u1(); // no, return narrow index | |
| 0 | 169 } |
| 170 | |
| 1565 | 171 // Get 2-byte index (byte swapping depending on which bytecode) |
| 172 int get_index_u2(bool is_wide = false) const { | |
| 2142 | 173 return bytecode().get_index_u2(cur_bc_raw(), is_wide); |
| 0 | 174 } |
| 175 | |
| 1565 | 176 // Get 2-byte index in native byte order. (Rewriter::rewrite makes these.) |
| 177 int get_index_u2_cpcache() const { | |
| 2142 | 178 return bytecode().get_index_u2_cpcache(cur_bc_raw()); |
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179 } |
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180 |
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181 // Get 4-byte index, for invokedynamic. |
| 1565 | 182 int get_index_u4() const { |
| 2142 | 183 return bytecode().get_index_u4(cur_bc_raw()); |
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184 } |
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185 |
| 1565 | 186 bool has_index_u4() const { |
| 2142 | 187 return bytecode().has_index_u4(cur_bc_raw()); |
| 1565 | 188 } |
| 0 | 189 |
| 190 // Get dimensions byte (multinewarray) | |
| 191 int get_dimensions() const { return *(unsigned char*)(_pc-1); } | |
| 192 | |
| 193 // Sign-extended index byte/short, no widening | |
| 2142 | 194 int get_constant_u1() const { return bytecode().get_constant_u1(instruction_size()-1, cur_bc_raw()); } |
| 195 int get_constant_u2(bool is_wide = false) const { return bytecode().get_constant_u2(instruction_size()-2, cur_bc_raw(), is_wide); } | |
| 0 | 196 |
| 197 // Get a byte signed constant for "iinc". Invalid for other bytecodes. | |
| 198 // If prefixed with a wide bytecode, get a wide constant | |
| 1565 | 199 int get_iinc_con() const {return (_pc==_was_wide) ? (jshort) get_constant_u2(true) : (jbyte) get_constant_u1();} |
| 0 | 200 |
| 201 // 2-byte branch offset from current pc | |
| 1565 | 202 int get_dest() const { |
| 2142 | 203 return cur_bci() + bytecode().get_offset_s2(cur_bc_raw()); |
| 0 | 204 } |
| 205 | |
| 206 // 2-byte branch offset from next pc | |
| 1565 | 207 int next_get_dest() const { |
| 208 assert(_pc < _end, ""); | |
| 2142 | 209 return next_bci() + next_bytecode().get_offset_s2(Bytecodes::_ifeq); |
| 0 | 210 } |
| 211 | |
| 212 // 4-byte branch offset from current pc | |
| 1565 | 213 int get_far_dest() const { |
| 2142 | 214 return cur_bci() + bytecode().get_offset_s4(cur_bc_raw()); |
| 0 | 215 } |
| 216 | |
| 217 // For a lookup or switch table, return target destination | |
| 218 int get_int_table( int index ) const { | |
| 219 return Bytes::get_Java_u4((address)&_table_base[index]); } | |
| 220 | |
| 221 // For tableswitch - get length of offset part | |
| 222 int get_tableswitch_length() { return get_int_table(2)-get_int_table(1)+1; } | |
| 223 | |
| 224 int get_dest_table( int index ) const { | |
| 225 return cur_bci() + get_int_table(index); } | |
| 226 | |
| 227 // --- Constant pool access --- | |
| 1602 | 228 int get_constant_raw_index() const; |
| 229 int get_constant_pool_index() const; | |
| 230 int get_constant_cache_index() const; | |
| 0 | 231 int get_field_index(); |
| 232 int get_method_index(); | |
| 233 | |
| 234 // If this bytecode is a new, newarray, multianewarray, instanceof, | |
| 235 // or checkcast, get the referenced klass. | |
| 236 ciKlass* get_klass(bool& will_link); | |
| 237 int get_klass_index() const; | |
| 238 | |
| 239 // If this bytecode is one of the ldc variants, get the referenced | |
| 1602 | 240 // constant. Do not attempt to resolve it, since that would require |
| 241 // execution of Java code. If it is not resolved, return an unloaded | |
| 242 // object (ciConstant.as_object()->is_loaded() == false). | |
| 0 | 243 ciConstant get_constant(); |
| 1602 | 244 constantTag get_constant_pool_tag(int index) const; |
| 245 | |
| 246 // True if the klass-using bytecode points to an unresolved klass | |
| 247 bool is_unresolved_klass() const { | |
| 248 constantTag tag = get_constant_pool_tag(get_klass_index()); | |
| 249 return tag.is_unresolved_klass(); | |
| 250 } | |
| 0 | 251 |
| 252 // If this bytecode is one of get_field, get_static, put_field, | |
| 253 // or put_static, get the referenced field. | |
| 254 ciField* get_field(bool& will_link); | |
| 255 | |
| 256 ciInstanceKlass* get_declared_field_holder(); | |
| 257 int get_field_holder_index(); | |
| 258 int get_field_signature_index(); | |
| 259 | |
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260 ciMethod* get_method(bool& will_link, ciSignature* *declared_signature_result); |
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261 bool has_appendix(); |
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262 ciObject* get_appendix(); |
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263 bool has_method_type(); |
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264 ciMethodType* get_method_type(); |
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265 ciKlass* get_declared_method_holder(); |
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266 int get_method_holder_index(); |
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267 int get_method_signature_index(); |
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268 |
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269 // Get the resolved references arrays from the constant pool |
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270 ciObjArray* get_resolved_references(); |
| 0 | 271 }; |
| 272 | |
| 273 | |
| 274 // ciSignatureStream | |
| 275 // | |
| 276 // The class is used to iterate over the elements of a method signature. | |
| 277 class ciSignatureStream : public StackObj { | |
| 278 private: | |
| 279 ciSignature* _sig; | |
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280 int _pos; |
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281 // holder is a method's holder |
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282 ciKlass* _holder; |
| 0 | 283 public: |
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284 ciSignatureStream(ciSignature* signature, ciKlass* holder = NULL) { |
| 0 | 285 _sig = signature; |
| 286 _pos = 0; | |
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287 _holder = holder; |
| 0 | 288 } |
| 289 | |
| 290 bool at_return_type() { return _pos == _sig->count(); } | |
| 291 | |
| 292 bool is_done() { return _pos > _sig->count(); } | |
| 293 | |
| 294 void next() { | |
| 295 if (_pos <= _sig->count()) { | |
| 296 _pos++; | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 ciType* type() { | |
| 301 if (at_return_type()) { | |
| 302 return _sig->return_type(); | |
| 303 } else { | |
| 304 return _sig->type_at(_pos); | |
| 305 } | |
| 306 } | |
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307 |
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308 // next klass in the signature |
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309 ciKlass* next_klass() { |
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310 ciKlass* sig_k; |
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311 if (_holder != NULL) { |
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312 sig_k = _holder; |
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313 _holder = NULL; |
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314 } else { |
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315 while (!type()->is_klass()) { |
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316 next(); |
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317 } |
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318 assert(!at_return_type(), "passed end of signature"); |
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319 sig_k = type()->as_klass(); |
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320 next(); |
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321 } |
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322 return sig_k; |
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323 } |
| 0 | 324 }; |
| 325 | |
| 326 | |
| 327 // ciExceptionHandlerStream | |
| 328 // | |
| 329 // The class is used to iterate over the exception handlers of | |
| 330 // a method. | |
| 331 class ciExceptionHandlerStream : public StackObj { | |
| 332 private: | |
| 333 // The method whose handlers we are traversing | |
| 334 ciMethod* _method; | |
| 335 | |
| 336 // Our current position in the list of handlers | |
| 337 int _pos; | |
| 338 int _end; | |
| 339 | |
| 340 ciInstanceKlass* _exception_klass; | |
| 341 int _bci; | |
| 342 bool _is_exact; | |
| 343 | |
| 344 public: | |
| 345 ciExceptionHandlerStream(ciMethod* method) { | |
| 346 _method = method; | |
| 347 | |
| 348 // Force loading of method code and handlers. | |
| 349 _method->code(); | |
| 350 | |
| 351 _pos = 0; | |
| 352 _end = _method->_handler_count; | |
| 353 _exception_klass = NULL; | |
| 354 _bci = -1; | |
| 355 _is_exact = false; | |
| 356 } | |
| 357 | |
| 358 ciExceptionHandlerStream(ciMethod* method, int bci, | |
| 359 ciInstanceKlass* exception_klass = NULL, | |
| 360 bool is_exact = false) { | |
| 361 _method = method; | |
| 362 | |
| 363 // Force loading of method code and handlers. | |
| 364 _method->code(); | |
| 365 | |
| 366 _pos = -1; | |
| 367 _end = _method->_handler_count + 1; // include the rethrow handler | |
| 368 _exception_klass = (exception_klass != NULL && exception_klass->is_loaded() | |
| 369 ? exception_klass | |
| 370 : NULL); | |
| 371 _bci = bci; | |
| 372 assert(_bci >= 0, "bci out of range"); | |
| 373 _is_exact = is_exact; | |
| 374 next(); | |
| 375 } | |
| 376 | |
| 377 // These methods are currently implemented in an odd way. | |
| 378 // Count the number of handlers the iterator has ever produced | |
| 379 // or will ever produce. Do not include the final rethrow handler. | |
| 380 // That is, a trivial exception handler stream will have a count | |
| 381 // of zero and produce just the rethrow handler. | |
| 382 int count(); | |
| 383 | |
| 384 // Count the number of handlers this stream will produce from now on. | |
| 385 // Include the current handler, and the final rethrow handler. | |
| 386 // The remaining count will be zero iff is_done() is true, | |
| 387 int count_remaining(); | |
| 388 | |
| 389 bool is_done() { | |
| 390 return (_pos >= _end); | |
| 391 } | |
| 392 | |
| 393 void next() { | |
| 394 _pos++; | |
| 395 if (_bci != -1) { | |
| 396 // We are not iterating over all handlers... | |
| 397 while (!is_done()) { | |
| 398 ciExceptionHandler* handler = _method->_exception_handlers[_pos]; | |
| 399 if (handler->is_in_range(_bci)) { | |
| 400 if (handler->is_catch_all()) { | |
| 401 // Found final active catch block. | |
| 402 _end = _pos+1; | |
| 403 return; | |
| 404 } else if (_exception_klass == NULL || !handler->catch_klass()->is_loaded()) { | |
| 405 // We cannot do any type analysis here. Must conservatively assume | |
| 406 // catch block is reachable. | |
| 407 return; | |
| 408 } else if (_exception_klass->is_subtype_of(handler->catch_klass())) { | |
| 409 // This catch clause will definitely catch the exception. | |
| 410 // Final candidate. | |
| 411 _end = _pos+1; | |
| 412 return; | |
| 413 } else if (!_is_exact && | |
| 414 handler->catch_klass()->is_subtype_of(_exception_klass)) { | |
| 415 // This catch block may be reachable. | |
| 416 return; | |
| 417 } | |
| 418 } | |
| 419 | |
| 420 // The catch block was not pertinent. Go on. | |
| 421 _pos++; | |
| 422 } | |
| 423 } else { | |
| 424 // This is an iteration over all handlers. | |
| 425 return; | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 ciExceptionHandler* handler() { | |
| 430 return _method->_exception_handlers[_pos]; | |
| 431 } | |
| 432 }; | |
| 1972 | 433 |
| 2142 | 434 |
| 435 | |
| 436 // Implementation for declarations in bytecode.hpp | |
| 437 Bytecode::Bytecode(const ciBytecodeStream* stream, address bcp): _bcp(bcp != NULL ? bcp : stream->cur_bcp()), _code(Bytecodes::code_at(NULL, addr_at(0))) {} | |
| 438 Bytecode_lookupswitch::Bytecode_lookupswitch(const ciBytecodeStream* stream): Bytecode(stream) { verify(); } | |
| 439 Bytecode_tableswitch::Bytecode_tableswitch(const ciBytecodeStream* stream): Bytecode(stream) { verify(); } | |
| 440 | |
| 1972 | 441 #endif // SHARE_VM_CI_CISTREAMS_HPP |