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.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::_newarray:
174 return get_index_u2();
175 default:
176 ShouldNotReachHere();
177 return 0;
178 }
179 }
180
181 // ------------------------------------------------------------------
182 // ciBytecodeStream::get_klass
183 //
184 // If this bytecode is a new, newarray, multianewarray, instanceof,
185 // or checkcast, get the referenced klass.
186 ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
187 VM_ENTRY_MARK;
188 constantPoolHandle cpool(_method->get_Method()->constants());
189 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
190 }
191
192 // ------------------------------------------------------------------
193 // ciBytecodeStream::get_constant_raw_index
194 //
195 // If this bytecode is one of the ldc variants, get the index of the
196 // referenced constant.
197 int ciBytecodeStream::get_constant_raw_index() const {
198 // work-alike for Bytecode_loadconstant::raw_index()
199 switch (cur_bc()) {
200 case Bytecodes::_ldc:
201 return get_index_u1();
202 case Bytecodes::_ldc_w:
203 case Bytecodes::_ldc2_w:
204 return get_index_u2();
205 default:
206 ShouldNotReachHere();
207 return 0;
208 }
209 }
210
211 // ------------------------------------------------------------------
212 // ciBytecodeStream::get_constant_pool_index
213 // Decode any reference index into a regular pool index.
214 int ciBytecodeStream::get_constant_pool_index() const {
215 // work-alike for Bytecode_loadconstant::pool_index()
216 int index = get_constant_raw_index();
217 if (has_cache_index()) {
218 VM_ENTRY_MARK;
219 constantPoolHandle cpool(_method->get_Method()->constants());
220 return cpool->object_to_cp_index(index);
221 }
222 return index;
223 }
224
225 // ------------------------------------------------------------------
226 // ciBytecodeStream::get_constant_cache_index
227 // Return the CP cache index, or -1 if there isn't any.
228 int ciBytecodeStream::get_constant_cache_index() const {
229 // work-alike for Bytecode_loadconstant::cache_index()
230 return has_cache_index() ? get_constant_raw_index() : -1;
231 }
232
233 // ------------------------------------------------------------------
234 // ciBytecodeStream::get_constant
235 //
236 // If this bytecode is one of the ldc variants, get the referenced
237 // constant.
238 ciConstant ciBytecodeStream::get_constant() {
239 int pool_index = get_constant_raw_index();
240 int cache_index = -1;
241 if (has_cache_index()) {
242 cache_index = pool_index;
243 pool_index = -1;
244 }
245 VM_ENTRY_MARK;
246 constantPoolHandle cpool(_method->get_Method()->constants());
247 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);
248 }
249
250 // ------------------------------------------------------------------
251 // ciBytecodeStream::get_constant_pool_tag
252 //
253 // If this bytecode is one of the ldc variants, get the referenced
254 // constant.
255 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {
256 VM_ENTRY_MARK;
257 return _method->get_Method()->constants()->tag_at(index);
258 }
259
260 // ------------------------------------------------------------------
261 // ciBytecodeStream::get_field_index
262 //
263 // If this is a field access bytecode, get the constant pool
264 // index of the referenced field.
265 int ciBytecodeStream::get_field_index() {
266 assert(cur_bc() == Bytecodes::_getfield ||
267 cur_bc() == Bytecodes::_putfield ||
268 cur_bc() == Bytecodes::_getstatic ||
269 cur_bc() == Bytecodes::_putstatic, "wrong bc");
270 return get_index_u2_cpcache();
271 }
272
273
274 // ------------------------------------------------------------------
275 // ciBytecodeStream::get_field
276 //
277 // If this bytecode is one of get_field, get_static, put_field,
278 // or put_static, get the referenced field.
279 ciField* ciBytecodeStream::get_field(bool& will_link) {
280 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
281 will_link = f->will_link(_holder, _bc);
282 return f;
283 }
284
285
286 // ------------------------------------------------------------------
287 // ciBytecodeStream::get_declared_field_holder
288 //
289 // Get the declared holder of the currently referenced field.
290 //
291 // Usage note: the holder() of a ciField class returns the canonical
292 // holder of the field, rather than the holder declared in the
293 // bytecodes.
294 //
295 // There is no "will_link" result passed back. The user is responsible
296 // for checking linkability when retrieving the associated field.
297 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
298 VM_ENTRY_MARK;
299 constantPoolHandle cpool(_method->get_Method()->constants());
300 int holder_index = get_field_holder_index();
301 bool ignore;
302 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
303 ->as_instance_klass();
304 }
305
306 // ------------------------------------------------------------------
307 // ciBytecodeStream::get_field_holder_index
308 //
309 // Get the constant pool index of the declared holder of the field
310 // referenced by the current bytecode. Used for generating
311 // deoptimization information.
312 int ciBytecodeStream::get_field_holder_index() {
313 GUARDED_VM_ENTRY(
314 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
315 return cpool->klass_ref_index_at(get_field_index());
316 )
317 }
318
319 // ------------------------------------------------------------------
320 // ciBytecodeStream::get_field_signature_index
321 //
322 // Get the constant pool index of the signature of the field
323 // referenced by the current bytecode. Used for generating
324 // deoptimization information.
325 int ciBytecodeStream::get_field_signature_index() {
326 VM_ENTRY_MARK;
327 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
328 int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
329 return cpool->signature_ref_index_at(nt_index);
330 }
331
332 // ------------------------------------------------------------------
333 // ciBytecodeStream::get_method_index
334 //
335 // If this is a method invocation bytecode, get the constant pool
336 // index of the invoked method.
337 int ciBytecodeStream::get_method_index() {
338 #ifdef ASSERT
339 switch (cur_bc()) {
340 case Bytecodes::_invokeinterface:
341 case Bytecodes::_invokevirtual:
342 case Bytecodes::_invokespecial:
343 case Bytecodes::_invokestatic:
344 case Bytecodes::_invokedynamic:
345 break;
346 default:
347 ShouldNotReachHere();
348 }
349 #endif
350 if (has_index_u4())
351 return get_index_u4(); // invokedynamic
352 return get_index_u2_cpcache();
353 }
354
355 // ------------------------------------------------------------------
356 // ciBytecodeStream::get_method
357 //
358 // If this is a method invocation bytecode, get the invoked method.
359 // Additionally return the declared signature to get more concrete
360 // type information if required (Cf. invokedynamic and invokehandle).
361 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {
362 VM_ENTRY_MARK;
363 ciEnv* env = CURRENT_ENV;
364 constantPoolHandle cpool(THREAD, _method->get_Method()->constants());
365 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
366 will_link = m->is_loaded();
367
368 // Use the MethodType stored in the CP cache to create a signature
369 // with correct types (in respect to class loaders).
370 if (has_method_type()) {
371 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool)));
372 ciKlass* pool_holder = env->get_klass(cpool->pool_holder());
373 ciMethodType* method_type = get_method_type();
374 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type);
375 (*declared_signature_result) = declared_signature;
376 } else {
377 (*declared_signature_result) = m->signature();
378 }
379 return m;
380 }
381
382 // ------------------------------------------------------------------
383 // ciBytecodeStream::has_appendix
384 //
385 // Returns true if there is an appendix argument stored in the
386 // constant pool cache at the current bci.
387 bool ciBytecodeStream::has_appendix() {
388 VM_ENTRY_MARK;
389 constantPoolHandle cpool(_method->get_Method()->constants());
390 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());
391 }
392
393 // ------------------------------------------------------------------
394 // ciBytecodeStream::get_appendix
395 //
396 // Return the appendix argument stored in the constant pool cache at
397 // the current bci.
398 ciObject* ciBytecodeStream::get_appendix() {
399 VM_ENTRY_MARK;
400 constantPoolHandle cpool(_method->get_Method()->constants());
401 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());
402 return CURRENT_ENV->get_object(appendix_oop);
403 }
404
405 // ------------------------------------------------------------------
406 // ciBytecodeStream::has_method_type
407 //
408 // Returns true if there is a MethodType argument stored in the
409 // constant pool cache at the current bci.
410 bool ciBytecodeStream::has_method_type() {
411 GUARDED_VM_ENTRY(
412 constantPoolHandle cpool(_method->get_Method()->constants());
413 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index());
414 )
415 }
416
417 // ------------------------------------------------------------------
418 // ciBytecodeStream::get_method_type
419 //
420 // Return the MethodType stored in the constant pool cache at
421 // the current bci.
422 ciMethodType* ciBytecodeStream::get_method_type() {
423 GUARDED_VM_ENTRY(
424 constantPoolHandle cpool(_method->get_Method()->constants());
425 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index());
426 return CURRENT_ENV->get_object(method_type_oop)->as_method_type();
427 )
428 }
429
430 // ------------------------------------------------------------------
431 // ciBytecodeStream::get_declared_method_holder
432 //
433 // Get the declared holder of the currently referenced method.
434 //
435 // Usage note: the holder() of a ciMethod class returns the canonical
436 // holder of the method, rather than the holder declared in the
437 // bytecodes.
438 //
439 // There is no "will_link" result passed back. The user is responsible
440 // for checking linkability when retrieving the associated method.
441 ciKlass* ciBytecodeStream::get_declared_method_holder() {
442 VM_ENTRY_MARK;
443 constantPoolHandle cpool(_method->get_Method()->constants());
444 bool ignore;
445 // report as MethodHandle for invokedynamic, which is syntactically classless
446 if (cur_bc() == Bytecodes::_invokedynamic)
447 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false);
448 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
449 }
450
451 // ------------------------------------------------------------------
452 // ciBytecodeStream::get_method_holder_index
453 //
454 // Get the constant pool index of the declared holder of the method
455 // referenced by the current bytecode. Used for generating
456 // deoptimization information.
457 int ciBytecodeStream::get_method_holder_index() {
458 ConstantPool* cpool = _method->get_Method()->constants();
459 return cpool->klass_ref_index_at(get_method_index());
460 }
461
462 // ------------------------------------------------------------------
463 // ciBytecodeStream::get_method_signature_index
464 //
465 // Get the constant pool index of the signature of the method
466 // referenced by the current bytecode. Used for generating
467 // deoptimization information.
468 int ciBytecodeStream::get_method_signature_index(const constantPoolHandle& cpool) {
469 GUARDED_VM_ENTRY(
470 const int method_index = get_method_index();
471 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
472 return cpool->signature_ref_index_at(name_and_type_index);
473 )
474 }
475
476 // ------------------------------------------------------------------
477 // ciBytecodeStream::get_resolved_references
478 ciObjArray* ciBytecodeStream::get_resolved_references() {
479 VM_ENTRY_MARK;
480 // Get the constant pool.
481 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
482
483 // Create a resolved references array and return it.
484 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();
485 }