Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/signature.cpp @ 1991:016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
Summary: Allow the eden to the expanded up to a point when the GC locker is active.
Reviewed-by: jwilhelm, johnc, ysr, jcoomes
author | tonyp |
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date | Tue, 07 Dec 2010 16:47:42 -0500 |
parents | f95d63e2154a |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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" | |
31 #include "oops/symbolOop.hpp" | |
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 | |
47 SignatureIterator::SignatureIterator(symbolHandle signature) { | |
48 assert(signature->is_symbol(), "not a symbol"); | |
49 _signature = signature; | |
50 _parameter_index = 0; | |
51 } | |
52 | |
53 // Overloaded version called without handle | |
54 SignatureIterator::SignatureIterator(symbolOop signature) { | |
55 symbolHandle sh(Thread::current(), signature); | |
56 _signature = sh; | |
57 _parameter_index = 0; | |
58 } | |
59 | |
60 SignatureIterator::SignatureIterator(Thread *thread, symbolOop signature) { | |
61 symbolHandle sh(thread, signature); | |
62 _signature = sh; | |
63 _parameter_index = 0; | |
64 } | |
65 | |
66 void SignatureIterator::expect(char c) { | |
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67 if (_signature->byte_at(_index) != c) fatal(err_msg("expecting %c", c)); |
0 | 68 _index++; |
69 } | |
70 | |
71 | |
72 void SignatureIterator::skip_optional_size() { | |
73 symbolOop sig = _signature(); | |
74 char c = sig->byte_at(_index); | |
75 while ('0' <= c && c <= '9') c = sig->byte_at(++_index); | |
76 } | |
77 | |
78 | |
79 int SignatureIterator::parse_type() { | |
80 // Note: This function could be simplified by using "return T_XXX_size;" | |
81 // instead of the assignment and the break statements. However, it | |
82 // seems that the product build for win32_i486 with MS VC++ 6.0 doesn't | |
83 // work (stack underflow for some tests) - this seems to be a VC++ 6.0 | |
84 // compiler bug (was problem - gri 4/27/2000). | |
85 int size = -1; | |
86 switch(_signature->byte_at(_index)) { | |
87 case 'B': do_byte (); if (_parameter_index < 0 ) _return_type = T_BYTE; | |
88 _index++; size = T_BYTE_size ; break; | |
89 case 'C': do_char (); if (_parameter_index < 0 ) _return_type = T_CHAR; | |
90 _index++; size = T_CHAR_size ; break; | |
91 case 'D': do_double(); if (_parameter_index < 0 ) _return_type = T_DOUBLE; | |
92 _index++; size = T_DOUBLE_size ; break; | |
93 case 'F': do_float (); if (_parameter_index < 0 ) _return_type = T_FLOAT; | |
94 _index++; size = T_FLOAT_size ; break; | |
95 case 'I': do_int (); if (_parameter_index < 0 ) _return_type = T_INT; | |
96 _index++; size = T_INT_size ; break; | |
97 case 'J': do_long (); if (_parameter_index < 0 ) _return_type = T_LONG; | |
98 _index++; size = T_LONG_size ; break; | |
99 case 'S': do_short (); if (_parameter_index < 0 ) _return_type = T_SHORT; | |
100 _index++; size = T_SHORT_size ; break; | |
101 case 'Z': do_bool (); if (_parameter_index < 0 ) _return_type = T_BOOLEAN; | |
102 _index++; size = T_BOOLEAN_size; break; | |
103 case 'V': do_void (); if (_parameter_index < 0 ) _return_type = T_VOID; | |
104 _index++; size = T_VOID_size; ; break; | |
105 case 'L': | |
106 { int begin = ++_index; | |
107 symbolOop sig = _signature(); | |
108 while (sig->byte_at(_index++) != ';') ; | |
109 do_object(begin, _index); | |
110 } | |
111 if (_parameter_index < 0 ) _return_type = T_OBJECT; | |
112 size = T_OBJECT_size; | |
113 break; | |
114 case '[': | |
115 { int begin = ++_index; | |
116 skip_optional_size(); | |
117 symbolOop sig = _signature(); | |
118 while (sig->byte_at(_index) == '[') { | |
119 _index++; | |
120 skip_optional_size(); | |
121 } | |
122 if (sig->byte_at(_index) == 'L') { | |
123 while (sig->byte_at(_index++) != ';') ; | |
124 } else { | |
125 _index++; | |
126 } | |
127 do_array(begin, _index); | |
128 if (_parameter_index < 0 ) _return_type = T_ARRAY; | |
129 } | |
130 size = T_ARRAY_size; | |
131 break; | |
132 default: | |
133 ShouldNotReachHere(); | |
134 break; | |
135 } | |
136 assert(size >= 0, "size must be set"); | |
137 return size; | |
138 } | |
139 | |
140 | |
141 void SignatureIterator::check_signature_end() { | |
142 if (_index < _signature->utf8_length()) { | |
143 tty->print_cr("too many chars in signature"); | |
144 _signature->print_value_on(tty); | |
145 tty->print_cr(" @ %d", _index); | |
146 } | |
147 } | |
148 | |
149 | |
150 void SignatureIterator::dispatch_field() { | |
151 // no '(', just one (field) type | |
152 _index = 0; | |
153 _parameter_index = 0; | |
154 parse_type(); | |
155 check_signature_end(); | |
156 } | |
157 | |
158 | |
159 void SignatureIterator::iterate_parameters() { | |
160 // Parse parameters | |
161 _index = 0; | |
162 _parameter_index = 0; | |
163 expect('('); | |
164 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); | |
165 expect(')'); | |
166 _parameter_index = 0; | |
167 } | |
168 | |
169 // Optimized version of iterat_parameters when fingerprint is known | |
170 void SignatureIterator::iterate_parameters( uint64_t fingerprint ) { | |
171 uint64_t saved_fingerprint = fingerprint; | |
172 | |
173 // Check for too many arguments | |
174 if ( fingerprint == UCONST64(-1) ) { | |
175 SignatureIterator::iterate_parameters(); | |
176 return; | |
177 } | |
178 | |
179 assert(fingerprint, "Fingerprint should not be 0"); | |
180 | |
181 _parameter_index = 0; | |
182 fingerprint = fingerprint >> (static_feature_size + result_feature_size); | |
183 while ( 1 ) { | |
184 switch ( fingerprint & parameter_feature_mask ) { | |
185 case bool_parm: | |
186 do_bool(); | |
187 _parameter_index += T_BOOLEAN_size; | |
188 break; | |
189 case byte_parm: | |
190 do_byte(); | |
191 _parameter_index += T_BYTE_size; | |
192 break; | |
193 case char_parm: | |
194 do_char(); | |
195 _parameter_index += T_CHAR_size; | |
196 break; | |
197 case short_parm: | |
198 do_short(); | |
199 _parameter_index += T_SHORT_size; | |
200 break; | |
201 case int_parm: | |
202 do_int(); | |
203 _parameter_index += T_INT_size; | |
204 break; | |
205 case obj_parm: | |
206 do_object(0, 0); | |
207 _parameter_index += T_OBJECT_size; | |
208 break; | |
209 case long_parm: | |
210 do_long(); | |
211 _parameter_index += T_LONG_size; | |
212 break; | |
213 case float_parm: | |
214 do_float(); | |
215 _parameter_index += T_FLOAT_size; | |
216 break; | |
217 case double_parm: | |
218 do_double(); | |
219 _parameter_index += T_DOUBLE_size; | |
220 break; | |
221 case done_parm: | |
222 return; | |
223 break; | |
224 default: | |
225 tty->print_cr("*** parameter is %d", fingerprint & parameter_feature_mask); | |
226 tty->print_cr("*** fingerprint is " PTR64_FORMAT, saved_fingerprint); | |
227 ShouldNotReachHere(); | |
228 break; | |
229 } | |
230 fingerprint >>= parameter_feature_size; | |
231 } | |
232 _parameter_index = 0; | |
233 } | |
234 | |
235 | |
236 void SignatureIterator::iterate_returntype() { | |
237 // Ignore parameters | |
238 _index = 0; | |
239 expect('('); | |
240 symbolOop sig = _signature(); | |
241 while (sig->byte_at(_index) != ')') _index++; | |
242 expect(')'); | |
243 // Parse return type | |
244 _parameter_index = -1; | |
245 parse_type(); | |
246 check_signature_end(); | |
247 _parameter_index = 0; | |
248 } | |
249 | |
250 | |
251 void SignatureIterator::iterate() { | |
252 // Parse parameters | |
253 _parameter_index = 0; | |
254 _index = 0; | |
255 expect('('); | |
256 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); | |
257 expect(')'); | |
258 // Parse return type | |
259 _parameter_index = -1; | |
260 parse_type(); | |
261 check_signature_end(); | |
262 _parameter_index = 0; | |
263 } | |
264 | |
265 | |
266 // Implementation of SignatureStream | |
267 | |
268 bool SignatureStream::is_done() const { | |
269 return _end > _signature()->utf8_length(); | |
270 } | |
271 | |
272 | |
273 void SignatureStream::next_non_primitive(int t) { | |
274 switch (t) { | |
275 case 'L': { | |
276 _type = T_OBJECT; | |
277 symbolOop sig = _signature(); | |
278 while (sig->byte_at(_end++) != ';'); | |
279 break; | |
280 } | |
281 case '[': { | |
282 _type = T_ARRAY; | |
283 symbolOop sig = _signature(); | |
284 char c = sig->byte_at(_end); | |
285 while ('0' <= c && c <= '9') c = sig->byte_at(_end++); | |
286 while (sig->byte_at(_end) == '[') { | |
287 _end++; | |
288 c = sig->byte_at(_end); | |
289 while ('0' <= c && c <= '9') c = sig->byte_at(_end++); | |
290 } | |
291 switch(sig->byte_at(_end)) { | |
292 case 'B': | |
293 case 'C': | |
294 case 'D': | |
295 case 'F': | |
296 case 'I': | |
297 case 'J': | |
298 case 'S': | |
299 case 'Z':_end++; break; | |
300 default: { | |
301 while (sig->byte_at(_end++) != ';'); | |
302 break; | |
303 } | |
304 } | |
305 break; | |
306 } | |
307 case ')': _end++; next(); _at_return_type = true; break; | |
308 default : ShouldNotReachHere(); | |
309 } | |
310 } | |
311 | |
312 | |
313 bool SignatureStream::is_object() const { | |
314 return _type == T_OBJECT | |
315 || _type == T_ARRAY; | |
316 } | |
317 | |
318 bool SignatureStream::is_array() const { | |
319 return _type == T_ARRAY; | |
320 } | |
321 | |
322 symbolOop SignatureStream::as_symbol(TRAPS) { | |
323 // Create a symbol from for string _begin _end | |
324 int begin = _begin; | |
325 int end = _end; | |
326 | |
327 if ( _signature()->byte_at(_begin) == 'L' | |
328 && _signature()->byte_at(_end-1) == ';') { | |
329 begin++; | |
330 end--; | |
331 } | |
332 | |
333 symbolOop result = oopFactory::new_symbol(_signature, begin, end, CHECK_NULL); | |
334 return result; | |
335 } | |
336 | |
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337 klassOop SignatureStream::as_klass(Handle class_loader, Handle protection_domain, |
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338 FailureMode failure_mode, TRAPS) { |
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339 if (!is_object()) return NULL; |
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340 symbolOop name = as_symbol(CHECK_NULL); |
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341 if (failure_mode == ReturnNull) { |
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342 return SystemDictionary::resolve_or_null(name, class_loader, protection_domain, THREAD); |
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343 } else { |
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344 bool throw_error = (failure_mode == NCDFError); |
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345 return SystemDictionary::resolve_or_fail(name, class_loader, protection_domain, throw_error, THREAD); |
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346 } |
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347 } |
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348 |
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349 oop SignatureStream::as_java_mirror(Handle class_loader, Handle protection_domain, |
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350 FailureMode failure_mode, TRAPS) { |
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351 if (!is_object()) |
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352 return Universe::java_mirror(type()); |
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353 klassOop klass = as_klass(class_loader, protection_domain, failure_mode, CHECK_NULL); |
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354 if (klass == NULL) return NULL; |
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355 return Klass::cast(klass)->java_mirror(); |
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356 } |
0 | 357 |
358 symbolOop SignatureStream::as_symbol_or_null() { | |
359 // Create a symbol from for string _begin _end | |
360 ResourceMark rm; | |
361 | |
362 int begin = _begin; | |
363 int end = _end; | |
364 | |
365 if ( _signature()->byte_at(_begin) == 'L' | |
366 && _signature()->byte_at(_end-1) == ';') { | |
367 begin++; | |
368 end--; | |
369 } | |
370 | |
371 char* buffer = NEW_RESOURCE_ARRAY(char, end - begin); | |
372 for (int index = begin; index < end; index++) { | |
373 buffer[index - begin] = _signature()->byte_at(index); | |
374 } | |
375 symbolOop result = SymbolTable::probe(buffer, end - begin); | |
376 return result; | |
377 } | |
378 | |
379 bool SignatureVerifier::is_valid_signature(symbolHandle sig) { | |
380 const char* signature = (const char*)sig->bytes(); | |
381 ssize_t len = sig->utf8_length(); | |
382 if (signature == NULL || signature[0] == '\0' || len < 1) { | |
383 return false; | |
384 } else if (signature[0] == '(') { | |
385 return is_valid_method_signature(sig); | |
386 } else { | |
387 return is_valid_type_signature(sig); | |
388 } | |
389 } | |
390 | |
391 bool SignatureVerifier::is_valid_method_signature(symbolHandle sig) { | |
392 const char* method_sig = (const char*)sig->bytes(); | |
393 ssize_t len = sig->utf8_length(); | |
394 ssize_t index = 0; | |
395 if (method_sig != NULL && len > 1 && method_sig[index] == '(') { | |
396 ++index; | |
397 while (index < len && method_sig[index] != ')') { | |
398 ssize_t res = is_valid_type(&method_sig[index], len - index); | |
399 if (res == -1) { | |
400 return false; | |
401 } else { | |
402 index += res; | |
403 } | |
404 } | |
405 if (index < len && method_sig[index] == ')') { | |
406 // check the return type | |
407 ++index; | |
408 return (is_valid_type(&method_sig[index], len - index) == (len - index)); | |
409 } | |
410 } | |
411 return false; | |
412 } | |
413 | |
414 bool SignatureVerifier::is_valid_type_signature(symbolHandle sig) { | |
415 const char* type_sig = (const char*)sig->bytes(); | |
416 ssize_t len = sig->utf8_length(); | |
417 return (type_sig != NULL && len >= 1 && | |
418 (is_valid_type(type_sig, len) == len)); | |
419 } | |
420 | |
421 // Checks to see if the type (not to go beyond 'limit') refers to a valid type. | |
422 // Returns -1 if it is not, or the index of the next character that is not part | |
423 // of the type. The type encoding may end before 'limit' and that's ok. | |
424 ssize_t SignatureVerifier::is_valid_type(const char* type, ssize_t limit) { | |
425 ssize_t index = 0; | |
426 | |
427 // Iterate over any number of array dimensions | |
428 while (index < limit && type[index] == '[') ++index; | |
429 if (index >= limit) { | |
430 return -1; | |
431 } | |
432 switch (type[index]) { | |
433 case 'B': case 'C': case 'D': case 'F': case 'I': | |
434 case 'J': case 'S': case 'Z': case 'V': | |
435 return index + 1; | |
436 case 'L': | |
437 for (index = index + 1; index < limit; ++index) { | |
438 char c = type[index]; | |
439 if (c == ';') { | |
440 return index + 1; | |
441 } | |
442 if (invalid_name_char(c)) { | |
443 return -1; | |
444 } | |
445 } | |
446 // fall through | |
447 default: ; // fall through | |
448 } | |
449 return -1; | |
450 } | |
451 | |
452 bool SignatureVerifier::invalid_name_char(char c) { | |
453 switch (c) { | |
454 case '\0': case '.': case ';': case '[': | |
455 return true; | |
456 default: | |
457 return false; | |
458 } | |
459 } |