Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/signature.hpp @ 2174:234761c55641
6608385: G1: need to support parallel reference processing
Summary: Implement support for ParallelRefProcEnabled in the reference processing that takes place at the end of G1 concurrent marking.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Tue, 25 Jan 2011 10:56:22 -0800 |
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 #ifndef SHARE_VM_RUNTIME_SIGNATURE_HPP |
26 #define SHARE_VM_RUNTIME_SIGNATURE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "oops/methodOop.hpp" | |
30 #include "utilities/top.hpp" | |
31 | |
0 | 32 // SignatureIterators iterate over a Java signature (or parts of it). |
33 // (Syntax according to: "The Java Virtual Machine Specification" by | |
34 // Tim Lindholm & Frank Yellin; section 4.3 Descriptors; p. 89ff.) | |
35 // | |
36 // Example: Iterating over ([Lfoo;D)I using | |
37 // 0123456789 | |
38 // | |
39 // iterate_parameters() calls: do_array(2, 7); do_double(); | |
40 // iterate_returntype() calls: do_int(); | |
41 // iterate() calls: do_array(2, 7); do_double(); do_int(); | |
42 // | |
43 // is_return_type() is: false ; false ; true | |
44 // | |
45 // NOTE: The new optimizer has an alternate, for-loop based signature | |
46 // iterator implemented in opto/type.cpp, TypeTuple::make(). | |
47 | |
48 class SignatureIterator: public ResourceObj { | |
49 protected: | |
50 symbolHandle _signature; // the signature to iterate over | |
51 int _index; // the current character index (only valid during iteration) | |
52 int _parameter_index; // the current parameter index (0 outside iteration phase) | |
53 BasicType _return_type; | |
54 | |
55 void expect(char c); | |
56 void skip_optional_size(); | |
57 int parse_type(); // returns the parameter size in words (0 for void) | |
58 void check_signature_end(); | |
59 | |
60 public: | |
61 // Definitions used in generating and iterating the | |
62 // bit field form of the signature generated by the | |
63 // Fingerprinter. | |
64 enum { | |
65 static_feature_size = 1, | |
66 result_feature_size = 4, | |
67 result_feature_mask = 0xF, | |
68 parameter_feature_size = 4, | |
69 parameter_feature_mask = 0xF, | |
70 | |
71 bool_parm = 1, | |
72 byte_parm = 2, | |
73 char_parm = 3, | |
74 short_parm = 4, | |
75 int_parm = 5, | |
76 long_parm = 6, | |
77 float_parm = 7, | |
78 double_parm = 8, | |
79 obj_parm = 9, | |
80 done_parm = 10, // marker for end of parameters | |
81 | |
82 // max parameters is wordsize minus | |
83 // The sign bit, termination field, the result and static bit fields | |
84 max_size_of_parameters = (BitsPerLong-1 - | |
85 result_feature_size - parameter_feature_size - | |
86 static_feature_size) / parameter_feature_size | |
87 }; | |
88 | |
89 // Constructors | |
90 SignatureIterator(symbolOop signature); | |
91 SignatureIterator(Thread *thread, symbolOop signature); | |
92 SignatureIterator(symbolHandle signature); | |
93 | |
94 // Iteration | |
95 void dispatch_field(); // dispatches once for field signatures | |
96 void iterate_parameters(); // iterates over parameters only | |
97 void iterate_parameters( uint64_t fingerprint ); | |
98 void iterate_returntype(); // iterates over returntype only | |
99 void iterate(); // iterates over whole signature | |
100 // Returns the word index of the current parameter; | |
101 int parameter_index() const { return _parameter_index; } | |
102 bool is_return_type() const { return parameter_index() < 0; } | |
103 BasicType get_ret_type() const { return _return_type; } | |
104 | |
105 // Basic types | |
106 virtual void do_bool () = 0; | |
107 virtual void do_char () = 0; | |
108 virtual void do_float () = 0; | |
109 virtual void do_double() = 0; | |
110 virtual void do_byte () = 0; | |
111 virtual void do_short () = 0; | |
112 virtual void do_int () = 0; | |
113 virtual void do_long () = 0; | |
114 virtual void do_void () = 0; | |
115 | |
116 // Object types (begin indexes the first character of the entry, end indexes the first character after the entry) | |
117 virtual void do_object(int begin, int end) = 0; | |
118 virtual void do_array (int begin, int end) = 0; | |
119 }; | |
120 | |
121 | |
122 // Specialized SignatureIterators: Used to compute signature specific values. | |
123 | |
124 class SignatureTypeNames : public SignatureIterator { | |
125 protected: | |
126 virtual void type_name(const char* name) = 0; | |
127 | |
128 void do_bool() { type_name("jboolean"); } | |
129 void do_char() { type_name("jchar" ); } | |
130 void do_float() { type_name("jfloat" ); } | |
131 void do_double() { type_name("jdouble" ); } | |
132 void do_byte() { type_name("jbyte" ); } | |
133 void do_short() { type_name("jshort" ); } | |
134 void do_int() { type_name("jint" ); } | |
135 void do_long() { type_name("jlong" ); } | |
136 void do_void() { type_name("void" ); } | |
137 void do_object(int begin, int end) { type_name("jobject" ); } | |
138 void do_array (int begin, int end) { type_name("jobject" ); } | |
139 | |
140 public: | |
141 SignatureTypeNames(symbolHandle signature) : SignatureIterator(signature) {} | |
142 }; | |
143 | |
144 | |
145 class SignatureInfo: public SignatureIterator { | |
146 protected: | |
147 bool _has_iterated; // need this because iterate cannot be called in constructor (set is virtual!) | |
148 bool _has_iterated_return; | |
149 int _size; | |
150 | |
151 void lazy_iterate_parameters() { if (!_has_iterated) { iterate_parameters(); _has_iterated = true; } } | |
152 void lazy_iterate_return() { if (!_has_iterated_return) { iterate_returntype(); _has_iterated_return = true; } } | |
153 | |
154 virtual void set(int size, BasicType type) = 0; | |
155 | |
156 void do_bool () { set(T_BOOLEAN_size, T_BOOLEAN); } | |
157 void do_char () { set(T_CHAR_size , T_CHAR ); } | |
158 void do_float () { set(T_FLOAT_size , T_FLOAT ); } | |
159 void do_double() { set(T_DOUBLE_size , T_DOUBLE ); } | |
160 void do_byte () { set(T_BYTE_size , T_BYTE ); } | |
161 void do_short () { set(T_SHORT_size , T_SHORT ); } | |
162 void do_int () { set(T_INT_size , T_INT ); } | |
163 void do_long () { set(T_LONG_size , T_LONG ); } | |
164 void do_void () { set(T_VOID_size , T_VOID ); } | |
165 void do_object(int begin, int end) { set(T_OBJECT_size , T_OBJECT ); } | |
166 void do_array (int begin, int end) { set(T_ARRAY_size , T_ARRAY ); } | |
167 | |
168 public: | |
169 SignatureInfo(symbolHandle signature) : SignatureIterator(signature) { | |
170 _has_iterated = _has_iterated_return = false; | |
171 _size = 0; | |
172 _return_type = T_ILLEGAL; | |
173 } | |
174 | |
175 }; | |
176 | |
177 | |
178 // Specialized SignatureIterator: Used to compute the argument size. | |
179 | |
180 class ArgumentSizeComputer: public SignatureInfo { | |
181 private: | |
182 void set(int size, BasicType type) { _size += size; } | |
183 public: | |
184 ArgumentSizeComputer(symbolHandle signature) : SignatureInfo(signature) {} | |
185 | |
186 int size() { lazy_iterate_parameters(); return _size; } | |
187 }; | |
188 | |
189 | |
190 class ArgumentCount: public SignatureInfo { | |
191 private: | |
192 void set(int size, BasicType type) { _size ++; } | |
193 public: | |
194 ArgumentCount(symbolHandle signature) : SignatureInfo(signature) {} | |
195 | |
196 int size() { lazy_iterate_parameters(); return _size; } | |
197 }; | |
198 | |
199 | |
200 // Specialized SignatureIterator: Used to compute the result type. | |
201 | |
202 class ResultTypeFinder: public SignatureInfo { | |
203 private: | |
204 void set(int size, BasicType type) { _return_type = type; } | |
205 public: | |
206 BasicType type() { lazy_iterate_return(); return _return_type; } | |
207 | |
208 ResultTypeFinder(symbolHandle signature) : SignatureInfo(signature) {} | |
209 }; | |
210 | |
211 | |
212 // Fingerprinter computes a unique ID for a given method. The ID | |
213 // is a bitvector characterizing the methods signature (incl. the receiver). | |
214 class Fingerprinter: public SignatureIterator { | |
215 private: | |
216 uint64_t _fingerprint; | |
217 int _shift_count; | |
218 methodHandle mh; | |
219 | |
220 public: | |
221 | |
222 void do_bool() { _fingerprint |= (((uint64_t)bool_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
223 void do_char() { _fingerprint |= (((uint64_t)char_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
224 void do_byte() { _fingerprint |= (((uint64_t)byte_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
225 void do_short() { _fingerprint |= (((uint64_t)short_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
226 void do_int() { _fingerprint |= (((uint64_t)int_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
227 void do_long() { _fingerprint |= (((uint64_t)long_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
228 void do_float() { _fingerprint |= (((uint64_t)float_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
229 void do_double() { _fingerprint |= (((uint64_t)double_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
230 | |
231 void do_object(int begin, int end) { _fingerprint |= (((uint64_t)obj_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
232 void do_array (int begin, int end) { _fingerprint |= (((uint64_t)obj_parm) << _shift_count); _shift_count += parameter_feature_size; } | |
233 | |
234 void do_void() { ShouldNotReachHere(); } | |
235 | |
236 Fingerprinter(methodHandle method) : SignatureIterator(method->signature()) { | |
237 mh = method; | |
238 _fingerprint = 0; | |
239 } | |
240 | |
241 Fingerprinter(Thread *thread, methodHandle method) : SignatureIterator(thread, method->signature()) { | |
242 mh = method; | |
243 _fingerprint = 0; | |
244 } | |
245 | |
246 uint64_t fingerprint() { | |
247 // See if we fingerprinted this method already | |
248 if (mh->constMethod()->fingerprint() != CONST64(0)) { | |
249 return mh->constMethod()->fingerprint(); | |
250 } | |
251 | |
252 if (mh->size_of_parameters() > max_size_of_parameters ) { | |
253 _fingerprint = UCONST64(-1); | |
254 mh->constMethod()->set_fingerprint(_fingerprint); | |
255 return _fingerprint; | |
256 } | |
257 | |
258 assert( (int)mh->result_type() <= (int)result_feature_mask, "bad result type"); | |
259 _fingerprint = mh->result_type(); | |
260 _fingerprint <<= static_feature_size; | |
261 if (mh->is_static()) _fingerprint |= 1; | |
262 _shift_count = result_feature_size + static_feature_size; | |
263 iterate_parameters(); | |
264 _fingerprint |= ((uint64_t)done_parm) << _shift_count;// mark end of sig | |
265 mh->constMethod()->set_fingerprint(_fingerprint); | |
266 return _fingerprint; | |
267 } | |
268 }; | |
269 | |
270 | |
271 // Specialized SignatureIterator: Used for native call purposes | |
272 | |
273 class NativeSignatureIterator: public SignatureIterator { | |
274 private: | |
275 methodHandle _method; | |
605 | 276 // We need separate JNI and Java offset values because in 64 bit mode, |
0 | 277 // the argument offsets are not in sync with the Java stack. |
278 // For example a long takes up 1 "C" stack entry but 2 Java stack entries. | |
279 int _offset; // The java stack offset | |
280 int _prepended; // number of prepended JNI parameters (1 JNIEnv, plus 1 mirror if static) | |
281 int _jni_offset; // the current parameter offset, starting with 0 | |
282 | |
283 void do_bool () { pass_int(); _jni_offset++; _offset++; } | |
284 void do_char () { pass_int(); _jni_offset++; _offset++; } | |
1010 | 285 void do_float () { pass_float(); _jni_offset++; _offset++; } |
0 | 286 #ifdef _LP64 |
287 void do_double() { pass_double(); _jni_offset++; _offset += 2; } | |
288 #else | |
289 void do_double() { pass_double(); _jni_offset += 2; _offset += 2; } | |
290 #endif | |
291 void do_byte () { pass_int(); _jni_offset++; _offset++; } | |
292 void do_short () { pass_int(); _jni_offset++; _offset++; } | |
293 void do_int () { pass_int(); _jni_offset++; _offset++; } | |
294 #ifdef _LP64 | |
295 void do_long () { pass_long(); _jni_offset++; _offset += 2; } | |
296 #else | |
297 void do_long () { pass_long(); _jni_offset += 2; _offset += 2; } | |
298 #endif | |
299 void do_void () { ShouldNotReachHere(); } | |
300 void do_object(int begin, int end) { pass_object(); _jni_offset++; _offset++; } | |
301 void do_array (int begin, int end) { pass_object(); _jni_offset++; _offset++; } | |
302 | |
303 public: | |
304 methodHandle method() const { return _method; } | |
305 int offset() const { return _offset; } | |
306 int jni_offset() const { return _jni_offset + _prepended; } | |
307 // int java_offset() const { return method()->size_of_parameters() - _offset - 1; } | |
308 bool is_static() const { return method()->is_static(); } | |
309 virtual void pass_int() = 0; | |
310 virtual void pass_long() = 0; | |
311 virtual void pass_object() = 0; | |
1010 | 312 virtual void pass_float() = 0; |
0 | 313 #ifdef _LP64 |
314 virtual void pass_double() = 0; | |
315 #else | |
316 virtual void pass_double() { pass_long(); } // may be same as long | |
317 #endif | |
318 | |
319 NativeSignatureIterator(methodHandle method) : SignatureIterator(method->signature()) { | |
320 _method = method; | |
321 _offset = 0; | |
322 _jni_offset = 0; | |
323 | |
324 const int JNIEnv_words = 1; | |
325 const int mirror_words = 1; | |
326 _prepended = !is_static() ? JNIEnv_words : JNIEnv_words + mirror_words; | |
327 } | |
328 | |
329 // iterate() calles the 2 virtual methods according to the following invocation syntax: | |
330 // | |
331 // {pass_int | pass_long | pass_object} | |
332 // | |
333 // Arguments are handled from left to right (receiver first, if any). | |
334 // The offset() values refer to the Java stack offsets but are 0 based and increasing. | |
335 // The java_offset() values count down to 0, and refer to the Java TOS. | |
336 // The jni_offset() values increase from 1 or 2, and refer to C arguments. | |
337 | |
338 void iterate() { iterate(Fingerprinter(method()).fingerprint()); | |
339 } | |
340 | |
341 | |
342 // Optimized path if we have the bitvector form of signature | |
343 void iterate( uint64_t fingerprint ) { | |
344 | |
345 if (!is_static()) { | |
346 // handle receiver (not handled by iterate because not in signature) | |
347 pass_object(); _jni_offset++; _offset++; | |
348 } | |
349 | |
350 SignatureIterator::iterate_parameters( fingerprint ); | |
351 } | |
352 }; | |
353 | |
354 | |
355 // Handy stream for iterating over signature | |
356 | |
357 class SignatureStream : public StackObj { | |
358 private: | |
359 symbolHandle _signature; | |
360 int _begin; | |
361 int _end; | |
362 BasicType _type; | |
363 bool _at_return_type; | |
364 | |
365 public: | |
366 bool at_return_type() const { return _at_return_type; } | |
367 bool is_done() const; | |
368 void next_non_primitive(int t); | |
369 void next() { | |
370 symbolOop sig = _signature(); | |
371 int len = sig->utf8_length(); | |
372 if (_end >= len) { | |
373 _end = len + 1; | |
374 return; | |
375 } | |
376 | |
377 _begin = _end; | |
378 int t = sig->byte_at(_begin); | |
379 switch (t) { | |
380 case 'B': _type = T_BYTE; break; | |
381 case 'C': _type = T_CHAR; break; | |
382 case 'D': _type = T_DOUBLE; break; | |
383 case 'F': _type = T_FLOAT; break; | |
384 case 'I': _type = T_INT; break; | |
385 case 'J': _type = T_LONG; break; | |
386 case 'S': _type = T_SHORT; break; | |
387 case 'Z': _type = T_BOOLEAN; break; | |
388 case 'V': _type = T_VOID; break; | |
389 default : next_non_primitive(t); | |
390 return; | |
391 } | |
392 _end++; | |
393 } | |
394 | |
395 SignatureStream(symbolHandle signature, | |
396 bool is_method = true) : | |
397 _signature(signature), _at_return_type(false) { | |
398 _begin = _end = (is_method ? 1 : 0); // skip first '(' in method signatures | |
399 next(); | |
400 } | |
401 | |
402 bool is_object() const; // True if this argument is an object | |
403 bool is_array() const; // True if this argument is an array | |
404 BasicType type() const { return _type; } | |
405 symbolOop as_symbol(TRAPS); | |
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406 enum FailureMode { ReturnNull, CNFException, NCDFError }; |
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407 klassOop as_klass(Handle class_loader, Handle protection_domain, FailureMode failure_mode, TRAPS); |
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408 oop as_java_mirror(Handle class_loader, Handle protection_domain, FailureMode failure_mode, TRAPS); |
0 | 409 |
410 // return same as_symbol except allocation of new symbols is avoided. | |
411 symbolOop as_symbol_or_null(); | |
412 }; | |
413 | |
414 class SignatureVerifier : public StackObj { | |
415 public: | |
416 // Returns true if the symbol is valid method or type signature | |
417 static bool is_valid_signature(symbolHandle sig); | |
418 | |
419 static bool is_valid_method_signature(symbolHandle sig); | |
420 static bool is_valid_type_signature(symbolHandle sig); | |
421 private: | |
422 | |
423 static ssize_t is_valid_type(const char*, ssize_t); | |
424 static bool invalid_name_char(char); | |
425 }; | |
1972 | 426 |
427 #endif // SHARE_VM_RUNTIME_SIGNATURE_HPP |