1 /*
2 * Copyright (c) 1999, 2016, 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.inline.hpp"
31 #include "runtime/handles.inline.hpp"
32
33 // ciExceptionHandlerStream
34 //
35 // Walk over some selected set of a methods exception handlers.
36
37 // ------------------------------------------------------------------
38 // ciExceptionHandlerStream::count
39 //
40 // How many exception handlers are there in this stream?
41 //
42 // Implementation note: Compiler2 needs this functionality, so I had
43 int ciExceptionHandlerStream::count() {
44 int save_pos = _pos;
45 int save_end = _end;
46
47 int count = 0;
48
49 _pos = -1;
50 _end = _method->_handler_count;
51
52
53 next();
54 while (!is_done()) {
55 count++;
56 next();
57 }
58
59 _pos = save_pos;
60 _end = save_end;
61
62 return count;
63 }
64
65 int ciExceptionHandlerStream::count_remaining() {
66 int save_pos = _pos;
67 int save_end = _end;
68
69 int count = 0;
70
71 while (!is_done()) {
72 count++;
73 next();
74 }
75
76 _pos = save_pos;
77 _end = save_end;
78
79 return count;
80 }
81
82 // ciBytecodeStream
83 //
84 // The class is used to iterate over the bytecodes of a method.
85 // It hides the details of constant pool structure/access by
86 // providing accessors for constant pool items.
87
88 // ------------------------------------------------------------------
89 // ciBytecodeStream::next_wide_or_table
90 //
91 // Special handling for switch ops
92 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) {
93 switch (bc) { // Check for special bytecode handling
94 case Bytecodes::_wide:
95 // Special handling for the wide bytcode
96 // Get following bytecode; do not return wide
97 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, "");
98 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]);
99 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress");
100 _pc += Bytecodes::wide_length_for(bc);
101 _was_wide = _pc; // Flag last wide bytecode found
102 assert(is_wide(), "accessor works right");
103 break;
104
105 case Bytecodes::_lookupswitch:
106 _pc++; // Skip wide bytecode
107 _pc += (_start-_pc)&3; // Word align
108 _table_base = (jint*)_pc; // Capture for later usage
109 // table_base[0] is default far_dest
110 // Table has 2 lead elements (default, length), then pairs of u4 values.
111 // So load table length, and compute address at end of table
112 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];
113 break;
114
115 case Bytecodes::_tableswitch: {
116 _pc++; // Skip wide bytecode
117 _pc += (_start-_pc)&3; // Word align
118 _table_base = (jint*)_pc; // Capture for later usage
119 // table_base[0] is default far_dest
120 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound
121 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound
122 int len = hi - lo + 1; // Dense table size
123 _pc = (address)&_table_base[3+len]; // Skip past table
124 break;
125 }
126
127 default:
128 fatal("unhandled bytecode");
129 }
130 return bc;
131 }
132
133 // ------------------------------------------------------------------
134 // ciBytecodeStream::reset_to_bci
135 void ciBytecodeStream::reset_to_bci( int bci ) {
136 _bc_start=_was_wide=0;
137 _pc = _start+bci;
138 }
139
140 // ------------------------------------------------------------------
141 // ciBytecodeStream::force_bci
142 void ciBytecodeStream::force_bci(int bci) {
143 if (bci < 0) {
144 reset_to_bci(0);
145 _bc_start = _start + bci;
146 _bc = EOBC();
147 } else {
148 reset_to_bci(bci);
149 next();
150 }
151 }
152
153
154 // ------------------------------------------------------------------
155 // Constant pool access
156 // ------------------------------------------------------------------
157
158 // ------------------------------------------------------------------
159 // ciBytecodeStream::get_klass_index
160 //
161 // If this bytecodes references a klass, return the index of the
162 // referenced klass.
163 int ciBytecodeStream::get_klass_index() const {
164 switch(cur_bc()) {
165 case Bytecodes::_ldc:
166 return get_index_u1();
167 case Bytecodes::_ldc_w:
168 case Bytecodes::_ldc2_w:
169 case Bytecodes::_checkcast:
170 case Bytecodes::_instanceof:
171 case Bytecodes::_anewarray:
172 case Bytecodes::_multianewarray:
173 case Bytecodes::_new:
174 case Bytecodes::_newarray:
175 return get_index_u2();
176 default:
177 ShouldNotReachHere();
178 return 0;
179 }
180 }
181
182 // ------------------------------------------------------------------
183 // ciBytecodeStream::get_klass
184 //
185 // If this bytecode is a new, newarray, multianewarray, instanceof,
186 // or checkcast, get the referenced klass.
187 ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
188 VM_ENTRY_MARK;
189 constantPoolHandle cpool(_method->get_Method()->constants());
190 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
191 }
192
193 // ------------------------------------------------------------------
194 // ciBytecodeStream::get_constant_raw_index
195 //
196 // If this bytecode is one of the ldc variants, get the index of the
197 // referenced constant.
198 int ciBytecodeStream::get_constant_raw_index() const {
199 // work-alike for Bytecode_loadconstant::raw_index()
200 switch (cur_bc()) {
201 case Bytecodes::_ldc:
202 return get_index_u1();
203 case Bytecodes::_ldc_w:
204 case Bytecodes::_ldc2_w:
205 return get_index_u2();
206 default:
207 ShouldNotReachHere();
208 return 0;
209 }
210 }
211
212 // ------------------------------------------------------------------
213 // ciBytecodeStream::get_constant_pool_index
214 // Decode any reference index into a regular pool index.
215 int ciBytecodeStream::get_constant_pool_index() const {
216 // work-alike for Bytecode_loadconstant::pool_index()
217 int index = get_constant_raw_index();
218 if (has_cache_index()) {
219 VM_ENTRY_MARK;
220 constantPoolHandle cpool(_method->get_Method()->constants());
221 return cpool->object_to_cp_index(index);
222 }
223 return index;
224 }
225
226 // ------------------------------------------------------------------
227 // ciBytecodeStream::get_constant_cache_index
228 // Return the CP cache index, or -1 if there isn't any.
229 int ciBytecodeStream::get_constant_cache_index() const {
230 // work-alike for Bytecode_loadconstant::cache_index()
231 return has_cache_index() ? get_constant_raw_index() : -1;
232 }
233
234 // ------------------------------------------------------------------
235 // ciBytecodeStream::get_constant
236 //
237 // If this bytecode is one of the ldc variants, get the referenced
238 // constant.
239 ciConstant ciBytecodeStream::get_constant() {
240 int pool_index = get_constant_raw_index();
241 int cache_index = -1;
242 if (has_cache_index()) {
243 cache_index = pool_index;
244 pool_index = -1;
245 }
246 VM_ENTRY_MARK;
247 constantPoolHandle cpool(_method->get_Method()->constants());
248 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);
249 }
250
251 // ------------------------------------------------------------------
252 // ciBytecodeStream::get_constant_pool_tag
253 //
254 // If this bytecode is one of the ldc variants, get the referenced
255 // constant.
256 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {
257 VM_ENTRY_MARK;
258 BasicType bt = _method->get_Method()->constants()->basic_type_for_constant_at(index);
259 return constantTag::ofBasicType(bt);
260 }
261
262 // ------------------------------------------------------------------
263 // ciBytecodeStream::get_field_index
264 //
265 // If this is a field access bytecode, get the constant pool
266 // index of the referenced field.
267 int ciBytecodeStream::get_field_index() {
268 assert(cur_bc() == Bytecodes::_getfield ||
269 cur_bc() == Bytecodes::_putfield ||
270 cur_bc() == Bytecodes::_getstatic ||
271 cur_bc() == Bytecodes::_putstatic, "wrong bc");
272 return get_index_u2_cpcache();
273 }
274
275
276 // ------------------------------------------------------------------
277 // ciBytecodeStream::get_field
278 //
279 // If this bytecode is one of get_field, get_static, put_field,
280 // or put_static, get the referenced field.
281 ciField* ciBytecodeStream::get_field(bool& will_link) {
282 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
283 will_link = f->will_link(_method, _bc);
284 return f;
285 }
286
287
288 // ------------------------------------------------------------------
289 // ciBytecodeStream::get_declared_field_holder
290 //
291 // Get the declared holder of the currently referenced field.
292 //
293 // Usage note: the holder() of a ciField class returns the canonical
294 // holder of the field, rather than the holder declared in the
295 // bytecodes.
296 //
297 // There is no "will_link" result passed back. The user is responsible
298 // for checking linkability when retrieving the associated field.
299 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
300 VM_ENTRY_MARK;
301 constantPoolHandle cpool(_method->get_Method()->constants());
302 int holder_index = get_field_holder_index();
303 bool ignore;
304 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
305 ->as_instance_klass();
306 }
307
308 // ------------------------------------------------------------------
309 // ciBytecodeStream::get_field_holder_index
310 //
311 // Get the constant pool index of the declared holder of the field
312 // referenced by the current bytecode. Used for generating
313 // deoptimization information.
314 int ciBytecodeStream::get_field_holder_index() {
315 GUARDED_VM_ENTRY(
316 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
317 return cpool->klass_ref_index_at(get_field_index());
318 )
319 }
320
321 // ------------------------------------------------------------------
322 // ciBytecodeStream::get_field_signature_index
323 //
324 // Get the constant pool index of the signature of the field
325 // referenced by the current bytecode. Used for generating
326 // deoptimization information.
327 int ciBytecodeStream::get_field_signature_index() {
328 VM_ENTRY_MARK;
329 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
330 int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
331 return cpool->signature_ref_index_at(nt_index);
332 }
333
334 // ------------------------------------------------------------------
335 // ciBytecodeStream::get_method_index
336 //
337 // If this is a method invocation bytecode, get the constant pool
338 // index of the invoked method.
339 int ciBytecodeStream::get_method_index() {
340 #ifdef ASSERT
341 switch (cur_bc()) {
342 case Bytecodes::_invokeinterface:
343 case Bytecodes::_invokevirtual:
344 case Bytecodes::_invokespecial:
345 case Bytecodes::_invokestatic:
346 case Bytecodes::_invokedynamic:
347 break;
348 default:
349 ShouldNotReachHere();
350 }
351 #endif
352 if (has_index_u4())
353 return get_index_u4(); // invokedynamic
354 return get_index_u2_cpcache();
355 }
356
357 // ------------------------------------------------------------------
358 // ciBytecodeStream::get_method
359 //
360 // If this is a method invocation bytecode, get the invoked method.
361 // Additionally return the declared signature to get more concrete
362 // type information if required (Cf. invokedynamic and invokehandle).
363 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {
364 VM_ENTRY_MARK;
365 ciEnv* env = CURRENT_ENV;
366 constantPoolHandle cpool(THREAD, _method->get_Method()->constants());
367 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
368 will_link = m->is_loaded();
369
370 // Use the MethodType stored in the CP cache to create a signature
371 // with correct types (in respect to class loaders).
372 if (has_method_type()) {
373 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool)));
374 ciKlass* pool_holder = env->get_klass(cpool->pool_holder());
375 ciMethodType* method_type = get_method_type();
376 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type);
377 (*declared_signature_result) = declared_signature;
378 } else {
379 (*declared_signature_result) = m->signature();
380 }
381 return m;
382 }
383
384 // ------------------------------------------------------------------
385 // ciBytecodeStream::has_appendix
386 //
387 // Returns true if there is an appendix argument stored in the
388 // constant pool cache at the current bci.
389 bool ciBytecodeStream::has_appendix() {
390 VM_ENTRY_MARK;
391 constantPoolHandle cpool(_method->get_Method()->constants());
392 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());
393 }
394
395 // ------------------------------------------------------------------
396 // ciBytecodeStream::get_appendix
397 //
398 // Return the appendix argument stored in the constant pool cache at
399 // the current bci.
400 ciObject* ciBytecodeStream::get_appendix() {
401 VM_ENTRY_MARK;
402 constantPoolHandle cpool(_method->get_Method()->constants());
403 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());
404 return CURRENT_ENV->get_object(appendix_oop);
405 }
406
407 // ------------------------------------------------------------------
408 // ciBytecodeStream::has_method_type
409 //
410 // Returns true if there is a MethodType argument stored in the
411 // constant pool cache at the current bci.
412 bool ciBytecodeStream::has_method_type() {
413 GUARDED_VM_ENTRY(
414 constantPoolHandle cpool(_method->get_Method()->constants());
415 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index());
416 )
417 }
418
419 // ------------------------------------------------------------------
420 // ciBytecodeStream::get_method_type
421 //
422 // Return the MethodType stored in the constant pool cache at
423 // the current bci.
424 ciMethodType* ciBytecodeStream::get_method_type() {
425 GUARDED_VM_ENTRY(
426 constantPoolHandle cpool(_method->get_Method()->constants());
427 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index());
428 return CURRENT_ENV->get_object(method_type_oop)->as_method_type();
429 )
430 }
431
432 // ------------------------------------------------------------------
433 // ciBytecodeStream::get_declared_method_holder
434 //
435 // Get the declared holder of the currently referenced method.
436 //
437 // Usage note: the holder() of a ciMethod class returns the canonical
438 // holder of the method, rather than the holder declared in the
439 // bytecodes.
440 //
441 // There is no "will_link" result passed back. The user is responsible
442 // for checking linkability when retrieving the associated method.
443 ciKlass* ciBytecodeStream::get_declared_method_holder() {
444 VM_ENTRY_MARK;
445 constantPoolHandle cpool(_method->get_Method()->constants());
446 bool ignore;
447 // report as MethodHandle for invokedynamic, which is syntactically classless
448 if (cur_bc() == Bytecodes::_invokedynamic)
449 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false);
450 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
451 }
452
453 // ------------------------------------------------------------------
454 // ciBytecodeStream::get_method_holder_index
455 //
456 // Get the constant pool index of the declared holder of the method
457 // referenced by the current bytecode. Used for generating
458 // deoptimization information.
459 int ciBytecodeStream::get_method_holder_index() {
460 ConstantPool* cpool = _method->get_Method()->constants();
461 return cpool->klass_ref_index_at(get_method_index());
462 }
463
464 // ------------------------------------------------------------------
465 // ciBytecodeStream::get_method_signature_index
466 //
467 // Get the constant pool index of the signature of the method
468 // referenced by the current bytecode. Used for generating
469 // deoptimization information.
470 int ciBytecodeStream::get_method_signature_index(const constantPoolHandle& cpool) {
471 GUARDED_VM_ENTRY(
472 const int method_index = get_method_index();
473 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
474 return cpool->signature_ref_index_at(name_and_type_index);
475 )
476 }
477
478 // ------------------------------------------------------------------
479 // ciBytecodeStream::get_resolved_references
480 ciObjArray* ciBytecodeStream::get_resolved_references() {
481 VM_ENTRY_MARK;
482 // Get the constant pool.
483 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
484
485 // Create a resolved references array and return it.
486 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();
487 }