1 /*
2 * Copyright (c) 1999, 2012, 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 "ci/ciCallSite.hpp"
27 #include "ci/ciConstant.hpp"
28 #include "ci/ciField.hpp"
29 #include "ci/ciStreams.hpp"
30 #include "ci/ciUtilities.hpp"
31
32 // ciExceptionHandlerStream
33 //
34 // Walk over some selected set of a methods exception handlers.
35
36 // ------------------------------------------------------------------
37 // ciExceptionHandlerStream::count
38 //
39 // How many exception handlers are there in this stream?
40 //
41 // Implementation note: Compiler2 needs this functionality, so I had
42 int ciExceptionHandlerStream::count() {
43 int save_pos = _pos;
44 int save_end = _end;
45
46 int count = 0;
47
48 _pos = -1;
49 _end = _method->_handler_count;
50
51
52 next();
53 while (!is_done()) {
54 count++;
55 next();
56 }
57
58 _pos = save_pos;
59 _end = save_end;
60
61 return count;
62 }
63
64 int ciExceptionHandlerStream::count_remaining() {
65 int save_pos = _pos;
66 int save_end = _end;
67
68 int count = 0;
69
70 while (!is_done()) {
71 count++;
72 next();
73 }
74
75 _pos = save_pos;
76 _end = save_end;
77
78 return count;
79 }
80
81 // ciBytecodeStream
82 //
83 // The class is used to iterate over the bytecodes of a method.
84 // It hides the details of constant pool structure/access by
85 // providing accessors for constant pool items.
86
87 // ------------------------------------------------------------------
88 // ciBytecodeStream::next_wide_or_table
89 //
90 // Special handling for switch ops
91 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) {
92 switch (bc) { // Check for special bytecode handling
93 case Bytecodes::_wide:
94 // Special handling for the wide bytcode
95 // Get following bytecode; do not return wide
96 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, "");
97 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]);
98 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress");
99 _pc += Bytecodes::wide_length_for(bc);
100 _was_wide = _pc; // Flag last wide bytecode found
101 assert(is_wide(), "accessor works right");
102 break;
103
104 case Bytecodes::_lookupswitch:
105 _pc++; // Skip wide bytecode
106 _pc += (_start-_pc)&3; // Word align
107 _table_base = (jint*)_pc; // Capture for later usage
108 // table_base[0] is default far_dest
109 // Table has 2 lead elements (default, length), then pairs of u4 values.
110 // So load table length, and compute address at end of table
111 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];
112 break;
113
114 case Bytecodes::_tableswitch: {
115 _pc++; // Skip wide bytecode
116 _pc += (_start-_pc)&3; // Word align
117 _table_base = (jint*)_pc; // Capture for later usage
118 // table_base[0] is default far_dest
119 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound
120 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound
121 int len = hi - lo + 1; // Dense table size
122 _pc = (address)&_table_base[3+len]; // Skip past table
123 break;
124 }
125
126 default:
127 fatal("unhandled bytecode");
128 }
129 return bc;
130 }
131
132 // ------------------------------------------------------------------
133 // ciBytecodeStream::reset_to_bci
134 void ciBytecodeStream::reset_to_bci( int bci ) {
135 _bc_start=_was_wide=0;
136 _pc = _start+bci;
137 }
138
139 // ------------------------------------------------------------------
140 // ciBytecodeStream::force_bci
141 void ciBytecodeStream::force_bci(int bci) {
142 if (bci < 0) {
143 reset_to_bci(0);
144 _bc_start = _start + bci;
145 _bc = EOBC();
146 } else {
147 reset_to_bci(bci);
148 next();
149 }
150 }
151
152
153 // ------------------------------------------------------------------
154 // Constant pool access
155 // ------------------------------------------------------------------
156
157 // ------------------------------------------------------------------
158 // ciBytecodeStream::get_klass_index
159 //
160 // If this bytecodes references a klass, return the index of the
161 // referenced klass.
162 int ciBytecodeStream::get_klass_index() const {
163 switch(cur_bc()) {
164 case Bytecodes::_ldc:
165 return get_index_u1();
166 case Bytecodes::_ldc_w:
167 case Bytecodes::_ldc2_w:
168 case Bytecodes::_checkcast:
169 case Bytecodes::_instanceof:
170 case Bytecodes::_anewarray:
171 case Bytecodes::_multianewarray:
172 case Bytecodes::_new:
173 case Bytecodes::_vnew:
174 case Bytecodes::_newarray:
175 case Bytecodes::_vunbox:
176 case Bytecodes::_vbox:
177 return get_index_u2();
178 default:
179 ShouldNotReachHere();
180 return 0;
181 }
182 }
183
184 // ------------------------------------------------------------------
185 // ciBytecodeStream::get_klass
186 //
187 // If this bytecode is a new, newarray, multianewarray, instanceof, vbox,
188 // vunbox, or checkcast, get the referenced klass.
189 ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
190 VM_ENTRY_MARK;
191 constantPoolHandle cpool(_method->get_Method()->constants());
192 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
193 }
194
195 // ------------------------------------------------------------------
196 // ciBytecodeStream::get_constant_raw_index
197 //
198 // If this bytecode is one of the ldc variants, get the index of the
199 // referenced constant.
200 int ciBytecodeStream::get_constant_raw_index() const {
201 // work-alike for Bytecode_loadconstant::raw_index()
202 switch (cur_bc()) {
203 case Bytecodes::_ldc:
204 return get_index_u1();
205 case Bytecodes::_ldc_w:
206 case Bytecodes::_ldc2_w:
207 return get_index_u2();
208 default:
209 ShouldNotReachHere();
210 return 0;
211 }
212 }
213
214 // ------------------------------------------------------------------
215 // ciBytecodeStream::get_constant_pool_index
216 // Decode any reference index into a regular pool index.
217 int ciBytecodeStream::get_constant_pool_index() const {
218 // work-alike for Bytecode_loadconstant::pool_index()
219 int index = get_constant_raw_index();
220 if (has_cache_index()) {
221 VM_ENTRY_MARK;
222 constantPoolHandle cpool(_method->get_Method()->constants());
223 return cpool->object_to_cp_index(index);
224 }
225 return index;
226 }
227
228 // ------------------------------------------------------------------
229 // ciBytecodeStream::get_constant_cache_index
230 // Return the CP cache index, or -1 if there isn't any.
231 int ciBytecodeStream::get_constant_cache_index() const {
232 // work-alike for Bytecode_loadconstant::cache_index()
233 return has_cache_index() ? get_constant_raw_index() : -1;
234 }
235
236 // ------------------------------------------------------------------
237 // ciBytecodeStream::get_constant
238 //
239 // If this bytecode is one of the ldc variants, get the referenced
240 // constant.
241 ciConstant ciBytecodeStream::get_constant() {
242 int pool_index = get_constant_raw_index();
243 int cache_index = -1;
244 if (has_cache_index()) {
245 cache_index = pool_index;
246 pool_index = -1;
247 }
248 VM_ENTRY_MARK;
249 constantPoolHandle cpool(_method->get_Method()->constants());
250 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);
251 }
252
253 // ------------------------------------------------------------------
254 // ciBytecodeStream::get_constant_pool_tag
255 //
256 // If this bytecode is one of the ldc variants, get the referenced
257 // constant.
258 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {
259 VM_ENTRY_MARK;
260 return _method->get_Method()->constants()->tag_at(index);
261 }
262
263 // ------------------------------------------------------------------
264 // ciBytecodeStream::get_field_index
265 //
266 // If this is a field access bytecode, get the constant pool
267 // index of the referenced field.
268 int ciBytecodeStream::get_field_index() {
269 assert(cur_bc() == Bytecodes::_getfield ||
270 cur_bc() == Bytecodes::_vgetfield ||
271 cur_bc() == Bytecodes::_putfield ||
272 cur_bc() == Bytecodes::_getstatic ||
273 cur_bc() == Bytecodes::_putstatic, "wrong bc");
274 return get_index_u2_cpcache();
275 }
276
277
278 // ------------------------------------------------------------------
279 // ciBytecodeStream::get_field
280 //
281 // If this bytecode is one of get_field, get_static, put_field,
282 // or put_static, get the referenced field.
283 ciField* ciBytecodeStream::get_field(bool& will_link) {
284 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
285 will_link = f->will_link(_holder, _bc);
286 return f;
287 }
288
289
290 // ------------------------------------------------------------------
291 // ciBytecodeStream::get_declared_field_holder
292 //
293 // Get the declared holder of the currently referenced field.
294 //
295 // Usage note: the holder() of a ciField class returns the canonical
296 // holder of the field, rather than the holder declared in the
297 // bytecodes.
298 //
299 // There is no "will_link" result passed back. The user is responsible
300 // for checking linkability when retrieving the associated field.
301 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
302 VM_ENTRY_MARK;
303 constantPoolHandle cpool(_method->get_Method()->constants());
304 int holder_index = get_field_holder_index();
305 bool ignore;
306 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
307 ->as_instance_klass();
308 }
309
310 // ------------------------------------------------------------------
311 // ciBytecodeStream::get_field_holder_index
312 //
313 // Get the constant pool index of the declared holder of the field
314 // referenced by the current bytecode. Used for generating
315 // deoptimization information.
316 int ciBytecodeStream::get_field_holder_index() {
317 GUARDED_VM_ENTRY(
318 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
319 return cpool->klass_ref_index_at(get_field_index());
320 )
321 }
322
323 // ------------------------------------------------------------------
324 // ciBytecodeStream::get_field_signature_index
325 //
326 // Get the constant pool index of the signature of the field
327 // referenced by the current bytecode. Used for generating
328 // deoptimization information.
329 int ciBytecodeStream::get_field_signature_index() {
330 VM_ENTRY_MARK;
331 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
332 int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
333 return cpool->signature_ref_index_at(nt_index);
334 }
335
336 // ------------------------------------------------------------------
337 // ciBytecodeStream::get_method_index
338 //
339 // If this is a method invocation bytecode, get the constant pool
340 // index of the invoked method.
341 int ciBytecodeStream::get_method_index() {
342 #ifdef ASSERT
343 switch (cur_bc()) {
344 case Bytecodes::_invokeinterface:
345 case Bytecodes::_invokevirtual:
346 case Bytecodes::_invokedirect:
347 case Bytecodes::_invokespecial:
348 case Bytecodes::_invokestatic:
349 case Bytecodes::_invokedynamic:
350 break;
351 default:
352 ShouldNotReachHere();
353 }
354 #endif
355 if (has_index_u4())
356 return get_index_u4(); // invokedynamic
357 return get_index_u2_cpcache();
358 }
359
360 // ------------------------------------------------------------------
361 // ciBytecodeStream::get_method
362 //
363 // If this is a method invocation bytecode, get the invoked method.
364 // Additionally return the declared signature to get more concrete
365 // type information if required (Cf. invokedynamic and invokehandle).
366 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {
367 VM_ENTRY_MARK;
368 ciEnv* env = CURRENT_ENV;
369 constantPoolHandle cpool(_method->get_Method()->constants());
370 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
371 will_link = m->is_loaded();
372
373 // Use the MethodType stored in the CP cache to create a signature
374 // with correct types (in respect to class loaders).
375 if (has_method_type()) {
376 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index()));
377 ciKlass* pool_holder = env->get_klass(cpool->pool_holder());
378 ciMethodType* method_type = get_method_type();
379 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type);
380 (*declared_signature_result) = declared_signature;
381 } else {
382 (*declared_signature_result) = m->signature();
383 }
384 return m;
385 }
386
387 // ------------------------------------------------------------------
388 // ciBytecodeStream::has_appendix
389 //
390 // Returns true if there is an appendix argument stored in the
391 // constant pool cache at the current bci.
392 bool ciBytecodeStream::has_appendix() {
393 VM_ENTRY_MARK;
394 constantPoolHandle cpool(_method->get_Method()->constants());
395 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());
396 }
397
398 // ------------------------------------------------------------------
399 // ciBytecodeStream::get_appendix
400 //
401 // Return the appendix argument stored in the constant pool cache at
402 // the current bci.
403 ciObject* ciBytecodeStream::get_appendix() {
404 VM_ENTRY_MARK;
405 constantPoolHandle cpool(_method->get_Method()->constants());
406 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());
407 return CURRENT_ENV->get_object(appendix_oop);
408 }
409
410 // ------------------------------------------------------------------
411 // ciBytecodeStream::has_method_type
412 //
413 // Returns true if there is a MethodType argument stored in the
414 // constant pool cache at the current bci.
415 bool ciBytecodeStream::has_method_type() {
416 GUARDED_VM_ENTRY(
417 constantPoolHandle cpool(_method->get_Method()->constants());
418 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index());
419 )
420 }
421
422 // ------------------------------------------------------------------
423 // ciBytecodeStream::get_method_type
424 //
425 // Return the MethodType stored in the constant pool cache at
426 // the current bci.
427 ciMethodType* ciBytecodeStream::get_method_type() {
428 GUARDED_VM_ENTRY(
429 constantPoolHandle cpool(_method->get_Method()->constants());
430 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index());
431 return CURRENT_ENV->get_object(method_type_oop)->as_method_type();
432 )
433 }
434
435 // ------------------------------------------------------------------
436 // ciBytecodeStream::get_declared_method_holder
437 //
438 // Get the declared holder of the currently referenced method.
439 //
440 // Usage note: the holder() of a ciMethod class returns the canonical
441 // holder of the method, rather than the holder declared in the
442 // bytecodes.
443 //
444 // There is no "will_link" result passed back. The user is responsible
445 // for checking linkability when retrieving the associated method.
446 ciKlass* ciBytecodeStream::get_declared_method_holder() {
447 VM_ENTRY_MARK;
448 constantPoolHandle cpool(_method->get_Method()->constants());
449 bool ignore;
450 // report as MethodHandle for invokedynamic, which is syntactically classless
451 if (cur_bc() == Bytecodes::_invokedynamic)
452 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false);
453 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
454 }
455
456 // ------------------------------------------------------------------
457 // ciBytecodeStream::get_method_holder_index
458 //
459 // Get the constant pool index of the declared holder of the method
460 // referenced by the current bytecode. Used for generating
461 // deoptimization information.
462 int ciBytecodeStream::get_method_holder_index() {
463 ConstantPool* cpool = _method->get_Method()->constants();
464 return cpool->klass_ref_index_at(get_method_index());
465 }
466
467 // ------------------------------------------------------------------
468 // ciBytecodeStream::get_method_signature_index
469 //
470 // Get the constant pool index of the signature of the method
471 // referenced by the current bytecode. Used for generating
472 // deoptimization information.
473 int ciBytecodeStream::get_method_signature_index() {
474 GUARDED_VM_ENTRY(
475 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
476 const int method_index = get_method_index();
477 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
478 return cpool->signature_ref_index_at(name_and_type_index);
479 )
480 }
481
482 // ------------------------------------------------------------------
483 // ciBytecodeStream::get_resolved_references
484 ciObjArray* ciBytecodeStream::get_resolved_references() {
485 VM_ENTRY_MARK;
486 // Get the constant pool.
487 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
488
489 // Create a resolved references array and return it.
490 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();
491 }