Mercurial > hg > truffle
annotate src/share/vm/runtime/signature.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 63a4eb8bcd23 |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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 #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 | |
14309 | 155 // Optimized version of iterate_parameters when fingerprint is known |
0 | 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 int SignatureStream::reference_parameter_count() { |
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382 int args_count = 0; |
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383 for ( ; !at_return_type(); next()) { |
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384 if (is_object()) { |
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385 args_count++; |
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386 } |
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387 } |
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388 return args_count; |
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389 } |
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390 |
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391 bool SignatureVerifier::is_valid_signature(Symbol* sig) { |
0 | 392 const char* signature = (const char*)sig->bytes(); |
393 ssize_t len = sig->utf8_length(); | |
394 if (signature == NULL || signature[0] == '\0' || len < 1) { | |
395 return false; | |
396 } else if (signature[0] == '(') { | |
397 return is_valid_method_signature(sig); | |
398 } else { | |
399 return is_valid_type_signature(sig); | |
400 } | |
401 } | |
402 | |
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403 bool SignatureVerifier::is_valid_method_signature(Symbol* sig) { |
0 | 404 const char* method_sig = (const char*)sig->bytes(); |
405 ssize_t len = sig->utf8_length(); | |
406 ssize_t index = 0; | |
407 if (method_sig != NULL && len > 1 && method_sig[index] == '(') { | |
408 ++index; | |
409 while (index < len && method_sig[index] != ')') { | |
410 ssize_t res = is_valid_type(&method_sig[index], len - index); | |
411 if (res == -1) { | |
412 return false; | |
413 } else { | |
414 index += res; | |
415 } | |
416 } | |
417 if (index < len && method_sig[index] == ')') { | |
418 // check the return type | |
419 ++index; | |
420 return (is_valid_type(&method_sig[index], len - index) == (len - index)); | |
421 } | |
422 } | |
423 return false; | |
424 } | |
425 | |
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426 bool SignatureVerifier::is_valid_type_signature(Symbol* sig) { |
0 | 427 const char* type_sig = (const char*)sig->bytes(); |
428 ssize_t len = sig->utf8_length(); | |
429 return (type_sig != NULL && len >= 1 && | |
430 (is_valid_type(type_sig, len) == len)); | |
431 } | |
432 | |
433 // Checks to see if the type (not to go beyond 'limit') refers to a valid type. | |
434 // Returns -1 if it is not, or the index of the next character that is not part | |
435 // of the type. The type encoding may end before 'limit' and that's ok. | |
436 ssize_t SignatureVerifier::is_valid_type(const char* type, ssize_t limit) { | |
437 ssize_t index = 0; | |
438 | |
439 // Iterate over any number of array dimensions | |
440 while (index < limit && type[index] == '[') ++index; | |
441 if (index >= limit) { | |
442 return -1; | |
443 } | |
444 switch (type[index]) { | |
445 case 'B': case 'C': case 'D': case 'F': case 'I': | |
446 case 'J': case 'S': case 'Z': case 'V': | |
447 return index + 1; | |
448 case 'L': | |
449 for (index = index + 1; index < limit; ++index) { | |
450 char c = type[index]; | |
451 if (c == ';') { | |
452 return index + 1; | |
453 } | |
454 if (invalid_name_char(c)) { | |
455 return -1; | |
456 } | |
457 } | |
458 // fall through | |
459 default: ; // fall through | |
460 } | |
461 return -1; | |
462 } | |
463 | |
464 bool SignatureVerifier::invalid_name_char(char c) { | |
465 switch (c) { | |
466 case '\0': case '.': case ';': case '[': | |
467 return true; | |
468 default: | |
469 return false; | |
470 } | |
471 } |