Mercurial > hg > truffle
annotate src/share/vm/runtime/signature.cpp @ 12144:d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
Summary: don't re-evaluate stack bounds for main thread before install guard page
Reviewed-by: coleenp, dholmes, dlong
| author | dsamersoff |
|---|---|
| date | Thu, 29 Aug 2013 21:48:23 +0400 |
| parents | 070d523b96a7 |
| children | d13d7aba8c12 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 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 "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "memory/oopFactory.hpp" | |
| 29 #include "oops/instanceKlass.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
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31 #include "oops/symbol.hpp" |
| 1972 | 32 #include "oops/typeArrayKlass.hpp" |
| 33 #include "runtime/signature.hpp" | |
| 0 | 34 |
| 35 | |
| 36 // Implementation of SignatureIterator | |
| 37 | |
| 38 // Signature syntax: | |
| 39 // | |
| 40 // Signature = "(" {Parameter} ")" ReturnType. | |
| 41 // Parameter = FieldType. | |
| 42 // ReturnType = FieldType | "V". | |
| 43 // FieldType = "B" | "C" | "D" | "F" | "I" | "J" | "S" | "Z" | "L" ClassName ";" | "[" FieldType. | |
| 44 // ClassName = string. | |
| 45 | |
| 46 | |
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47 SignatureIterator::SignatureIterator(Symbol* signature) { |
| 0 | 48 _signature = signature; |
| 49 _parameter_index = 0; | |
| 50 } | |
| 51 | |
| 52 void SignatureIterator::expect(char c) { | |
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53 if (_signature->byte_at(_index) != c) fatal(err_msg("expecting %c", c)); |
| 0 | 54 _index++; |
| 55 } | |
| 56 | |
| 57 | |
| 58 void SignatureIterator::skip_optional_size() { | |
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59 Symbol* sig = _signature; |
| 0 | 60 char c = sig->byte_at(_index); |
| 61 while ('0' <= c && c <= '9') c = sig->byte_at(++_index); | |
| 62 } | |
| 63 | |
| 64 | |
| 65 int SignatureIterator::parse_type() { | |
| 66 // Note: This function could be simplified by using "return T_XXX_size;" | |
| 67 // instead of the assignment and the break statements. However, it | |
| 68 // seems that the product build for win32_i486 with MS VC++ 6.0 doesn't | |
| 69 // work (stack underflow for some tests) - this seems to be a VC++ 6.0 | |
| 70 // compiler bug (was problem - gri 4/27/2000). | |
| 71 int size = -1; | |
| 72 switch(_signature->byte_at(_index)) { | |
| 73 case 'B': do_byte (); if (_parameter_index < 0 ) _return_type = T_BYTE; | |
| 74 _index++; size = T_BYTE_size ; break; | |
| 75 case 'C': do_char (); if (_parameter_index < 0 ) _return_type = T_CHAR; | |
| 76 _index++; size = T_CHAR_size ; break; | |
| 77 case 'D': do_double(); if (_parameter_index < 0 ) _return_type = T_DOUBLE; | |
| 78 _index++; size = T_DOUBLE_size ; break; | |
| 79 case 'F': do_float (); if (_parameter_index < 0 ) _return_type = T_FLOAT; | |
| 80 _index++; size = T_FLOAT_size ; break; | |
| 81 case 'I': do_int (); if (_parameter_index < 0 ) _return_type = T_INT; | |
| 82 _index++; size = T_INT_size ; break; | |
| 83 case 'J': do_long (); if (_parameter_index < 0 ) _return_type = T_LONG; | |
| 84 _index++; size = T_LONG_size ; break; | |
| 85 case 'S': do_short (); if (_parameter_index < 0 ) _return_type = T_SHORT; | |
| 86 _index++; size = T_SHORT_size ; break; | |
| 87 case 'Z': do_bool (); if (_parameter_index < 0 ) _return_type = T_BOOLEAN; | |
| 88 _index++; size = T_BOOLEAN_size; break; | |
| 89 case 'V': do_void (); if (_parameter_index < 0 ) _return_type = T_VOID; | |
| 90 _index++; size = T_VOID_size; ; break; | |
| 91 case 'L': | |
| 92 { int begin = ++_index; | |
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93 Symbol* sig = _signature; |
| 0 | 94 while (sig->byte_at(_index++) != ';') ; |
| 95 do_object(begin, _index); | |
| 96 } | |
| 97 if (_parameter_index < 0 ) _return_type = T_OBJECT; | |
| 98 size = T_OBJECT_size; | |
| 99 break; | |
| 100 case '[': | |
| 101 { int begin = ++_index; | |
| 102 skip_optional_size(); | |
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103 Symbol* sig = _signature; |
| 0 | 104 while (sig->byte_at(_index) == '[') { |
| 105 _index++; | |
| 106 skip_optional_size(); | |
| 107 } | |
| 108 if (sig->byte_at(_index) == 'L') { | |
| 109 while (sig->byte_at(_index++) != ';') ; | |
| 110 } else { | |
| 111 _index++; | |
| 112 } | |
| 113 do_array(begin, _index); | |
| 114 if (_parameter_index < 0 ) _return_type = T_ARRAY; | |
| 115 } | |
| 116 size = T_ARRAY_size; | |
| 117 break; | |
| 118 default: | |
| 119 ShouldNotReachHere(); | |
| 120 break; | |
| 121 } | |
| 122 assert(size >= 0, "size must be set"); | |
| 123 return size; | |
| 124 } | |
| 125 | |
| 126 | |
| 127 void SignatureIterator::check_signature_end() { | |
| 128 if (_index < _signature->utf8_length()) { | |
| 129 tty->print_cr("too many chars in signature"); | |
| 130 _signature->print_value_on(tty); | |
| 131 tty->print_cr(" @ %d", _index); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 | |
| 136 void SignatureIterator::dispatch_field() { | |
| 137 // no '(', just one (field) type | |
| 138 _index = 0; | |
| 139 _parameter_index = 0; | |
| 140 parse_type(); | |
| 141 check_signature_end(); | |
| 142 } | |
| 143 | |
| 144 | |
| 145 void SignatureIterator::iterate_parameters() { | |
| 146 // Parse parameters | |
| 147 _index = 0; | |
| 148 _parameter_index = 0; | |
| 149 expect('('); | |
| 150 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); | |
| 151 expect(')'); | |
| 152 _parameter_index = 0; | |
| 153 } | |
| 154 | |
| 155 // Optimized version of iterat_parameters when fingerprint is known | |
| 156 void SignatureIterator::iterate_parameters( uint64_t fingerprint ) { | |
| 157 uint64_t saved_fingerprint = fingerprint; | |
| 158 | |
| 159 // Check for too many arguments | |
| 160 if ( fingerprint == UCONST64(-1) ) { | |
| 161 SignatureIterator::iterate_parameters(); | |
| 162 return; | |
| 163 } | |
| 164 | |
| 165 assert(fingerprint, "Fingerprint should not be 0"); | |
| 166 | |
| 167 _parameter_index = 0; | |
| 168 fingerprint = fingerprint >> (static_feature_size + result_feature_size); | |
| 169 while ( 1 ) { | |
| 170 switch ( fingerprint & parameter_feature_mask ) { | |
| 171 case bool_parm: | |
| 172 do_bool(); | |
| 173 _parameter_index += T_BOOLEAN_size; | |
| 174 break; | |
| 175 case byte_parm: | |
| 176 do_byte(); | |
| 177 _parameter_index += T_BYTE_size; | |
| 178 break; | |
| 179 case char_parm: | |
| 180 do_char(); | |
| 181 _parameter_index += T_CHAR_size; | |
| 182 break; | |
| 183 case short_parm: | |
| 184 do_short(); | |
| 185 _parameter_index += T_SHORT_size; | |
| 186 break; | |
| 187 case int_parm: | |
| 188 do_int(); | |
| 189 _parameter_index += T_INT_size; | |
| 190 break; | |
| 191 case obj_parm: | |
| 192 do_object(0, 0); | |
| 193 _parameter_index += T_OBJECT_size; | |
| 194 break; | |
| 195 case long_parm: | |
| 196 do_long(); | |
| 197 _parameter_index += T_LONG_size; | |
| 198 break; | |
| 199 case float_parm: | |
| 200 do_float(); | |
| 201 _parameter_index += T_FLOAT_size; | |
| 202 break; | |
| 203 case double_parm: | |
| 204 do_double(); | |
| 205 _parameter_index += T_DOUBLE_size; | |
| 206 break; | |
| 207 case done_parm: | |
| 208 return; | |
| 209 break; | |
| 210 default: | |
| 211 tty->print_cr("*** parameter is %d", fingerprint & parameter_feature_mask); | |
| 212 tty->print_cr("*** fingerprint is " PTR64_FORMAT, saved_fingerprint); | |
| 213 ShouldNotReachHere(); | |
| 214 break; | |
| 215 } | |
| 216 fingerprint >>= parameter_feature_size; | |
| 217 } | |
| 218 _parameter_index = 0; | |
| 219 } | |
| 220 | |
| 221 | |
| 222 void SignatureIterator::iterate_returntype() { | |
| 223 // Ignore parameters | |
| 224 _index = 0; | |
| 225 expect('('); | |
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226 Symbol* sig = _signature; |
| 0 | 227 while (sig->byte_at(_index) != ')') _index++; |
| 228 expect(')'); | |
| 229 // Parse return type | |
| 230 _parameter_index = -1; | |
| 231 parse_type(); | |
| 232 check_signature_end(); | |
| 233 _parameter_index = 0; | |
| 234 } | |
| 235 | |
| 236 | |
| 237 void SignatureIterator::iterate() { | |
| 238 // Parse parameters | |
| 239 _parameter_index = 0; | |
| 240 _index = 0; | |
| 241 expect('('); | |
| 242 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); | |
| 243 expect(')'); | |
| 244 // Parse return type | |
| 245 _parameter_index = -1; | |
| 246 parse_type(); | |
| 247 check_signature_end(); | |
| 248 _parameter_index = 0; | |
| 249 } | |
| 250 | |
| 251 | |
| 252 // Implementation of SignatureStream | |
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253 SignatureStream::SignatureStream(Symbol* signature, bool is_method) : |
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254 _signature(signature), _at_return_type(false) { |
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255 _begin = _end = (is_method ? 1 : 0); // skip first '(' in method signatures |
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256 _names = new GrowableArray<Symbol*>(10); |
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257 next(); |
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258 } |
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259 |
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260 SignatureStream::~SignatureStream() { |
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261 // decrement refcount for names created during signature parsing |
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262 for (int i = 0; i < _names->length(); i++) { |
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263 _names->at(i)->decrement_refcount(); |
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264 } |
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265 } |
| 0 | 266 |
| 267 bool SignatureStream::is_done() const { | |
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268 return _end > _signature->utf8_length(); |
| 0 | 269 } |
| 270 | |
| 271 | |
| 272 void SignatureStream::next_non_primitive(int t) { | |
| 273 switch (t) { | |
| 274 case 'L': { | |
| 275 _type = T_OBJECT; | |
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276 Symbol* sig = _signature; |
| 0 | 277 while (sig->byte_at(_end++) != ';'); |
| 278 break; | |
| 279 } | |
| 280 case '[': { | |
| 281 _type = T_ARRAY; | |
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282 Symbol* sig = _signature; |
| 0 | 283 char c = sig->byte_at(_end); |
| 284 while ('0' <= c && c <= '9') c = sig->byte_at(_end++); | |
| 285 while (sig->byte_at(_end) == '[') { | |
| 286 _end++; | |
| 287 c = sig->byte_at(_end); | |
| 288 while ('0' <= c && c <= '9') c = sig->byte_at(_end++); | |
| 289 } | |
| 290 switch(sig->byte_at(_end)) { | |
| 291 case 'B': | |
| 292 case 'C': | |
| 293 case 'D': | |
| 294 case 'F': | |
| 295 case 'I': | |
| 296 case 'J': | |
| 297 case 'S': | |
| 298 case 'Z':_end++; break; | |
| 299 default: { | |
| 300 while (sig->byte_at(_end++) != ';'); | |
| 301 break; | |
| 302 } | |
| 303 } | |
| 304 break; | |
| 305 } | |
| 306 case ')': _end++; next(); _at_return_type = true; break; | |
| 307 default : ShouldNotReachHere(); | |
| 308 } | |
| 309 } | |
| 310 | |
| 311 | |
| 312 bool SignatureStream::is_object() const { | |
| 313 return _type == T_OBJECT | |
| 314 || _type == T_ARRAY; | |
| 315 } | |
| 316 | |
| 317 bool SignatureStream::is_array() const { | |
| 318 return _type == T_ARRAY; | |
| 319 } | |
| 320 | |
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321 Symbol* SignatureStream::as_symbol(TRAPS) { |
| 0 | 322 // Create a symbol from for string _begin _end |
| 323 int begin = _begin; | |
| 324 int end = _end; | |
| 325 | |
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326 if ( _signature->byte_at(_begin) == 'L' |
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327 && _signature->byte_at(_end-1) == ';') { |
| 0 | 328 begin++; |
| 329 end--; | |
| 330 } | |
| 331 | |
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332 // Save names for cleaning up reference count at the end of |
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333 // SignatureStream scope. |
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334 Symbol* name = SymbolTable::new_symbol(_signature, begin, end, CHECK_NULL); |
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335 _names->push(name); // save new symbol for decrementing later |
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336 return name; |
| 0 | 337 } |
| 338 | |
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339 Klass* SignatureStream::as_klass(Handle class_loader, Handle protection_domain, |
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340 FailureMode failure_mode, TRAPS) { |
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341 if (!is_object()) return NULL; |
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342 Symbol* name = as_symbol(CHECK_NULL); |
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343 if (failure_mode == ReturnNull) { |
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344 return SystemDictionary::resolve_or_null(name, class_loader, protection_domain, THREAD); |
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345 } else { |
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346 bool throw_error = (failure_mode == NCDFError); |
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347 return SystemDictionary::resolve_or_fail(name, class_loader, protection_domain, throw_error, THREAD); |
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348 } |
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349 } |
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350 |
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351 oop SignatureStream::as_java_mirror(Handle class_loader, Handle protection_domain, |
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352 FailureMode failure_mode, TRAPS) { |
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353 if (!is_object()) |
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354 return Universe::java_mirror(type()); |
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355 Klass* klass = as_klass(class_loader, protection_domain, failure_mode, CHECK_NULL); |
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356 if (klass == NULL) return NULL; |
| 6983 | 357 return klass->java_mirror(); |
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358 } |
| 0 | 359 |
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360 Symbol* SignatureStream::as_symbol_or_null() { |
| 0 | 361 // Create a symbol from for string _begin _end |
| 362 ResourceMark rm; | |
| 363 | |
| 364 int begin = _begin; | |
| 365 int end = _end; | |
| 366 | |
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367 if ( _signature->byte_at(_begin) == 'L' |
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368 && _signature->byte_at(_end-1) == ';') { |
| 0 | 369 begin++; |
| 370 end--; | |
| 371 } | |
| 372 | |
| 373 char* buffer = NEW_RESOURCE_ARRAY(char, end - begin); | |
| 374 for (int index = begin; index < end; index++) { | |
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375 buffer[index - begin] = _signature->byte_at(index); |
| 0 | 376 } |
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377 Symbol* result = SymbolTable::probe(buffer, end - begin); |
| 0 | 378 return result; |
| 379 } | |
| 380 | |
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381 bool SignatureVerifier::is_valid_signature(Symbol* sig) { |
| 0 | 382 const char* signature = (const char*)sig->bytes(); |
| 383 ssize_t len = sig->utf8_length(); | |
| 384 if (signature == NULL || signature[0] == '\0' || len < 1) { | |
| 385 return false; | |
| 386 } else if (signature[0] == '(') { | |
| 387 return is_valid_method_signature(sig); | |
| 388 } else { | |
| 389 return is_valid_type_signature(sig); | |
| 390 } | |
| 391 } | |
| 392 | |
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393 bool SignatureVerifier::is_valid_method_signature(Symbol* sig) { |
| 0 | 394 const char* method_sig = (const char*)sig->bytes(); |
| 395 ssize_t len = sig->utf8_length(); | |
| 396 ssize_t index = 0; | |
| 397 if (method_sig != NULL && len > 1 && method_sig[index] == '(') { | |
| 398 ++index; | |
| 399 while (index < len && method_sig[index] != ')') { | |
| 400 ssize_t res = is_valid_type(&method_sig[index], len - index); | |
| 401 if (res == -1) { | |
| 402 return false; | |
| 403 } else { | |
| 404 index += res; | |
| 405 } | |
| 406 } | |
| 407 if (index < len && method_sig[index] == ')') { | |
| 408 // check the return type | |
| 409 ++index; | |
| 410 return (is_valid_type(&method_sig[index], len - index) == (len - index)); | |
| 411 } | |
| 412 } | |
| 413 return false; | |
| 414 } | |
| 415 | |
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416 bool SignatureVerifier::is_valid_type_signature(Symbol* sig) { |
| 0 | 417 const char* type_sig = (const char*)sig->bytes(); |
| 418 ssize_t len = sig->utf8_length(); | |
| 419 return (type_sig != NULL && len >= 1 && | |
| 420 (is_valid_type(type_sig, len) == len)); | |
| 421 } | |
| 422 | |
| 423 // Checks to see if the type (not to go beyond 'limit') refers to a valid type. | |
| 424 // Returns -1 if it is not, or the index of the next character that is not part | |
| 425 // of the type. The type encoding may end before 'limit' and that's ok. | |
| 426 ssize_t SignatureVerifier::is_valid_type(const char* type, ssize_t limit) { | |
| 427 ssize_t index = 0; | |
| 428 | |
| 429 // Iterate over any number of array dimensions | |
| 430 while (index < limit && type[index] == '[') ++index; | |
| 431 if (index >= limit) { | |
| 432 return -1; | |
| 433 } | |
| 434 switch (type[index]) { | |
| 435 case 'B': case 'C': case 'D': case 'F': case 'I': | |
| 436 case 'J': case 'S': case 'Z': case 'V': | |
| 437 return index + 1; | |
| 438 case 'L': | |
| 439 for (index = index + 1; index < limit; ++index) { | |
| 440 char c = type[index]; | |
| 441 if (c == ';') { | |
| 442 return index + 1; | |
| 443 } | |
| 444 if (invalid_name_char(c)) { | |
| 445 return -1; | |
| 446 } | |
| 447 } | |
| 448 // fall through | |
| 449 default: ; // fall through | |
| 450 } | |
| 451 return -1; | |
| 452 } | |
| 453 | |
| 454 bool SignatureVerifier::invalid_name_char(char c) { | |
| 455 switch (c) { | |
| 456 case '\0': case '.': case ';': case '[': | |
| 457 return true; | |
| 458 default: | |
| 459 return false; | |
| 460 } | |
| 461 } |