1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
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/symbol.hpp"
32 #include "oops/typeArrayKlass.hpp"
33 #include "runtime/signature.hpp"
34
35 // Implementation of SignatureIterator
36
37 // Signature syntax:
38 //
39 // Signature = "(" {Parameter} ")" ReturnType.
40 // Parameter = FieldType.
41 // ReturnType = FieldType | "V".
42 // FieldType = "B" | "C" | "D" | "F" | "I" | "J" | "S" | "Z" | "L" ClassName ";" | "[" FieldType.
43 // ClassName = string.
44
45
46 SignatureIterator::SignatureIterator(Symbol* signature) {
47 _signature = signature;
48 _parameter_index = 0;
49 }
50
51 void SignatureIterator::expect(char c) {
52 if (_signature->byte_at(_index) != c) fatal("expecting %c", c);
53 _index++;
54 }
55
56
57 void SignatureIterator::skip_optional_size() {
58 Symbol* sig = _signature;
59 char c = sig->byte_at(_index);
60 while ('0' <= c && c <= '9') c = sig->byte_at(++_index);
61 }
62
63
64 int SignatureIterator::parse_type() {
65 // Note: This function could be simplified by using "return T_XXX_size;"
66 // instead of the assignment and the break statements. However, it
67 // seems that the product build for win32_i486 with MS VC++ 6.0 doesn't
68 // work (stack underflow for some tests) - this seems to be a VC++ 6.0
69 // compiler bug (was problem - gri 4/27/2000).
70 int size = -1;
71 switch(_signature->byte_at(_index)) {
72 case 'B': do_byte (); if (_parameter_index < 0 ) _return_type = T_BYTE;
73 _index++; size = T_BYTE_size ; break;
74 case 'C': do_char (); if (_parameter_index < 0 ) _return_type = T_CHAR;
75 _index++; size = T_CHAR_size ; break;
76 case 'D': do_double(); if (_parameter_index < 0 ) _return_type = T_DOUBLE;
77 _index++; size = T_DOUBLE_size ; break;
78 case 'F': do_float (); if (_parameter_index < 0 ) _return_type = T_FLOAT;
79 _index++; size = T_FLOAT_size ; break;
80 case 'I': do_int (); if (_parameter_index < 0 ) _return_type = T_INT;
81 _index++; size = T_INT_size ; break;
82 case 'J': do_long (); if (_parameter_index < 0 ) _return_type = T_LONG;
83 _index++; size = T_LONG_size ; break;
84 case 'S': do_short (); if (_parameter_index < 0 ) _return_type = T_SHORT;
85 _index++; size = T_SHORT_size ; break;
86 case 'Z': do_bool (); if (_parameter_index < 0 ) _return_type = T_BOOLEAN;
87 _index++; size = T_BOOLEAN_size; break;
88 case 'V': do_void (); if (_parameter_index < 0 ) _return_type = T_VOID;
89 _index++; size = T_VOID_size; ; break;
90 case 'L':
91 { int begin = ++_index;
92 Symbol* sig = _signature;
93 while (sig->byte_at(_index++) != ';') ;
94 do_object(begin, _index);
95 }
96 if (_parameter_index < 0 ) _return_type = T_OBJECT;
97 size = T_OBJECT_size;
98 break;
99 case '[':
100 { int begin = ++_index;
101 skip_optional_size();
102 Symbol* sig = _signature;
103 while (sig->byte_at(_index) == '[') {
104 _index++;
105 skip_optional_size();
106 }
107 if (sig->byte_at(_index) == 'L') {
108 while (sig->byte_at(_index++) != ';') ;
109 } else {
110 _index++;
111 }
112 do_array(begin, _index);
113 if (_parameter_index < 0 ) _return_type = T_ARRAY;
114 }
115 size = T_ARRAY_size;
116 break;
117 default:
118 ShouldNotReachHere();
119 break;
120 }
121 assert(size >= 0, "size must be set");
122 return size;
123 }
124
125
126 void SignatureIterator::check_signature_end() {
127 if (_index < _signature->utf8_length()) {
128 tty->print_cr("too many chars in signature");
129 _signature->print_value_on(tty);
130 tty->print_cr(" @ %d", _index);
131 }
132 }
133
134
135 void SignatureIterator::dispatch_field() {
136 // no '(', just one (field) type
137 _index = 0;
138 _parameter_index = 0;
139 parse_type();
140 check_signature_end();
141 }
142
143
144 void SignatureIterator::iterate_parameters() {
145 // Parse parameters
146 _index = 0;
147 _parameter_index = 0;
148 expect('(');
149 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type();
150 expect(')');
151 _parameter_index = 0;
152 }
153
154 // Optimized version of iterate_parameters when fingerprint is known
155 void SignatureIterator::iterate_parameters( uint64_t fingerprint ) {
156 uint64_t saved_fingerprint = fingerprint;
157
158 // Check for too many arguments
159 if (fingerprint == (uint64_t)CONST64(-1)) {
160 SignatureIterator::iterate_parameters();
161 return;
162 }
163
164 assert(fingerprint, "Fingerprint should not be 0");
165
166 _parameter_index = 0;
167 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
168 while ( 1 ) {
169 switch ( fingerprint & parameter_feature_mask ) {
170 case bool_parm:
171 do_bool();
172 _parameter_index += T_BOOLEAN_size;
173 break;
174 case byte_parm:
175 do_byte();
176 _parameter_index += T_BYTE_size;
177 break;
178 case char_parm:
179 do_char();
180 _parameter_index += T_CHAR_size;
181 break;
182 case short_parm:
183 do_short();
184 _parameter_index += T_SHORT_size;
185 break;
186 case int_parm:
187 do_int();
188 _parameter_index += T_INT_size;
189 break;
190 case obj_parm:
191 do_object(0, 0);
192 _parameter_index += T_OBJECT_size;
193 break;
194 case long_parm:
195 do_long();
196 _parameter_index += T_LONG_size;
197 break;
198 case float_parm:
199 do_float();
200 _parameter_index += T_FLOAT_size;
201 break;
202 case double_parm:
203 do_double();
204 _parameter_index += T_DOUBLE_size;
205 break;
206 case done_parm:
207 return;
208 break;
209 default:
210 tty->print_cr("*** parameter is " INT64_FORMAT, fingerprint & parameter_feature_mask);
211 tty->print_cr("*** fingerprint is " PTR64_FORMAT, saved_fingerprint);
212 ShouldNotReachHere();
213 break;
214 }
215 fingerprint >>= parameter_feature_size;
216 }
217 _parameter_index = 0;
218 }
219
220
221 void SignatureIterator::iterate_returntype() {
222 // Ignore parameters
223 _index = 0;
224 expect('(');
225 Symbol* sig = _signature;
226 while (sig->byte_at(_index) != ')') _index++;
227 expect(')');
228 // Parse return type
229 _parameter_index = -1;
230 parse_type();
231 check_signature_end();
232 _parameter_index = 0;
233 }
234
235
236 void SignatureIterator::iterate() {
237 // Parse parameters
238 _parameter_index = 0;
239 _index = 0;
240 expect('(');
241 while (_signature->byte_at(_index) != ')') _parameter_index += parse_type();
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 // Implementation of SignatureStream
252 SignatureStream::SignatureStream(Symbol* signature, bool is_method) :
253 _signature(signature), _at_return_type(false) {
254 _begin = _end = (is_method ? 1 : 0); // skip first '(' in method signatures
255 _names = new GrowableArray<Symbol*>(10);
256 next();
257 }
258
259 SignatureStream::~SignatureStream() {
260 // decrement refcount for names created during signature parsing
261 for (int i = 0; i < _names->length(); i++) {
262 _names->at(i)->decrement_refcount();
263 }
264 }
265
266 bool SignatureStream::is_done() const {
267 return _end > _signature->utf8_length();
268 }
269
270
271 void SignatureStream::next_non_primitive(int t) {
272 switch (t) {
273 case 'L': {
274 _type = T_OBJECT;
275 Symbol* sig = _signature;
276 while (sig->byte_at(_end++) != ';');
277 break;
278 }
279 case '[': {
280 _type = T_ARRAY;
281 Symbol* sig = _signature;
282 char c = sig->byte_at(_end);
283 while ('0' <= c && c <= '9') c = sig->byte_at(_end++);
284 while (sig->byte_at(_end) == '[') {
285 _end++;
286 c = sig->byte_at(_end);
287 while ('0' <= c && c <= '9') c = sig->byte_at(_end++);
288 }
289 switch(sig->byte_at(_end)) {
290 case 'B':
291 case 'C':
292 case 'D':
293 case 'F':
294 case 'I':
295 case 'J':
296 case 'S':
297 case 'Z':_end++; break;
298 default: {
299 while (sig->byte_at(_end++) != ';');
300 break;
301 }
302 }
303 break;
304 }
305 case ')': _end++; next(); _at_return_type = true; break;
306 default : ShouldNotReachHere();
307 }
308 }
309
310
311 bool SignatureStream::is_object() const {
312 return _type == T_OBJECT
313 || _type == T_ARRAY;
314 }
315
316 bool SignatureStream::is_array() const {
317 return _type == T_ARRAY;
318 }
319
320 Symbol* SignatureStream::as_symbol(TRAPS) {
321 // Create a symbol from for string _begin _end
322 int begin = _begin;
323 int end = _end;
324
325 if ( _signature->byte_at(_begin) == 'L'
326 && _signature->byte_at(_end-1) == ';') {
327 begin++;
328 end--;
329 }
330
331 // Save names for cleaning up reference count at the end of
332 // SignatureStream scope.
333 Symbol* name = SymbolTable::new_symbol(_signature, begin, end, CHECK_NULL);
334 _names->push(name); // save new symbol for decrementing later
335 return name;
336 }
337
338 Klass* SignatureStream::as_klass(Handle class_loader, Handle protection_domain,
339 FailureMode failure_mode, TRAPS) {
340 if (!is_object()) return NULL;
341 Symbol* name = as_symbol(CHECK_NULL);
342 if (failure_mode == ReturnNull) {
343 return SystemDictionary::resolve_or_null(name, class_loader, protection_domain, THREAD);
344 } else {
345 bool throw_error = (failure_mode == NCDFError);
346 return SystemDictionary::resolve_or_fail(name, class_loader, protection_domain, throw_error, THREAD);
347 }
348 }
349
350 oop SignatureStream::as_java_mirror(Handle class_loader, Handle protection_domain,
351 FailureMode failure_mode, TRAPS) {
352 if (!is_object())
353 return Universe::java_mirror(type());
354 Klass* klass = as_klass(class_loader, protection_domain, failure_mode, CHECK_NULL);
355 if (klass == NULL) return NULL;
356 return klass->java_mirror();
357 }
358
359 Symbol* SignatureStream::as_symbol_or_null() {
360 // Create a symbol from for string _begin _end
361 ResourceMark rm;
362
363 int begin = _begin;
364 int end = _end;
365
366 if ( _signature->byte_at(_begin) == 'L'
367 && _signature->byte_at(_end-1) == ';') {
368 begin++;
369 end--;
370 }
371
372 char* buffer = NEW_RESOURCE_ARRAY(char, end - begin);
373 for (int index = begin; index < end; index++) {
374 buffer[index - begin] = _signature->byte_at(index);
375 }
376 Symbol* result = SymbolTable::probe(buffer, end - begin);
377 return result;
378 }
379
380 int SignatureStream::reference_parameter_count() {
381 int args_count = 0;
382 for ( ; !at_return_type(); next()) {
383 if (is_object()) {
384 args_count++;
385 }
386 }
387 return args_count;
388 }
389
390 bool SignatureVerifier::is_valid_signature(Symbol* sig) {
391 const char* signature = (const char*)sig->bytes();
392 ssize_t len = sig->utf8_length();
393 if (signature == NULL || signature[0] == '\0' || len < 1) {
394 return false;
395 } else if (signature[0] == '(') {
396 return is_valid_method_signature(sig);
397 } else {
398 return is_valid_type_signature(sig);
399 }
400 }
401
402 bool SignatureVerifier::is_valid_method_signature(Symbol* sig) {
403 const char* method_sig = (const char*)sig->bytes();
404 ssize_t len = sig->utf8_length();
405 ssize_t index = 0;
406 if (method_sig != NULL && len > 1 && method_sig[index] == '(') {
407 ++index;
408 while (index < len && method_sig[index] != ')') {
409 ssize_t res = is_valid_type(&method_sig[index], len - index);
410 if (res == -1) {
411 return false;
412 } else {
413 index += res;
414 }
415 }
416 if (index < len && method_sig[index] == ')') {
417 // check the return type
418 ++index;
419 return (is_valid_type(&method_sig[index], len - index) == (len - index));
420 }
421 }
422 return false;
423 }
424
425 bool SignatureVerifier::is_valid_type_signature(Symbol* sig) {
426 const char* type_sig = (const char*)sig->bytes();
427 ssize_t len = sig->utf8_length();
428 return (type_sig != NULL && len >= 1 &&
429 (is_valid_type(type_sig, len) == len));
430 }
431
432 // Checks to see if the type (not to go beyond 'limit') refers to a valid type.
433 // Returns -1 if it is not, or the index of the next character that is not part
434 // of the type. The type encoding may end before 'limit' and that's ok.
435 ssize_t SignatureVerifier::is_valid_type(const char* type, ssize_t limit) {
436 ssize_t index = 0;
437
438 // Iterate over any number of array dimensions
439 while (index < limit && type[index] == '[') ++index;
440 if (index >= limit) {
441 return -1;
442 }
443 switch (type[index]) {
444 case 'B': case 'C': case 'D': case 'F': case 'I':
445 case 'J': case 'S': case 'Z': case 'V':
446 return index + 1;
447 case 'L':
448 for (index = index + 1; index < limit; ++index) {
449 char c = type[index];
450 if (c == ';') {
451 return index + 1;
452 }
453 if (invalid_name_char(c)) {
454 return -1;
455 }
456 }
457 // fall through
458 default: ; // fall through
459 }
460 return -1;
461 }
462
463 bool SignatureVerifier::invalid_name_char(char c) {
464 switch (c) {
465 case '\0': case '.': case ';': case '[':
466 return true;
467 default:
468 return false;
469 }
470 }