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::_defaultvalue:
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, vbox,
186 // vunbox, 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 ||
272 cur_bc() == Bytecodes::_withfield, "wrong bc");
273 return get_index_u2_cpcache();
274 }
275
276
277 // ------------------------------------------------------------------
278 // ciBytecodeStream::get_field
279 //
280 // If this bytecode is one of get_field, get_static, put_field,
281 // or put_static, get the referenced field.
282 ciField* ciBytecodeStream::get_field(bool& will_link) {
283 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
284 will_link = f->will_link(_method, _bc);
285 return f;
286 }
287
288
289 // ------------------------------------------------------------------
290 // ciBytecodeStream::get_declared_field_holder
291 //
292 // Get the declared holder of the currently referenced field.
293 //
294 // Usage note: the holder() of a ciField class returns the canonical
295 // holder of the field, rather than the holder declared in the
296 // bytecodes.
297 //
298 // There is no "will_link" result passed back. The user is responsible
299 // for checking linkability when retrieving the associated field.
300 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
301 VM_ENTRY_MARK;
302 constantPoolHandle cpool(_method->get_Method()->constants());
303 int holder_index = get_field_holder_index();
304 bool ignore;
305 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
306 ->as_instance_klass();
307 }
308
309 // ------------------------------------------------------------------
310 // ciBytecodeStream::get_field_holder_index
311 //
312 // Get the constant pool index of the declared holder of the field
313 // referenced by the current bytecode. Used for generating
314 // deoptimization information.
315 int ciBytecodeStream::get_field_holder_index() {
316 GUARDED_VM_ENTRY(
317 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
318 return cpool->klass_ref_index_at(get_field_index());
319 )
320 }
321
322 // ------------------------------------------------------------------
323 // ciBytecodeStream::get_field_signature_index
324 //
325 // Get the constant pool index of the signature of the field
326 // referenced by the current bytecode. Used for generating
327 // deoptimization information.
328 int ciBytecodeStream::get_field_signature_index() {
329 VM_ENTRY_MARK;
330 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
331 int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
332 return cpool->signature_ref_index_at(nt_index);
333 }
334
335 // ------------------------------------------------------------------
336 // ciBytecodeStream::get_method_index
337 //
338 // If this is a method invocation bytecode, get the constant pool
339 // index of the invoked method.
340 int ciBytecodeStream::get_method_index() {
341 #ifdef ASSERT
342 switch (cur_bc()) {
343 case Bytecodes::_invokeinterface:
344 case Bytecodes::_invokevirtual:
345 case Bytecodes::_invokespecial:
346 case Bytecodes::_invokestatic:
347 case Bytecodes::_invokedynamic:
348 break;
349 default:
350 ShouldNotReachHere();
351 }
352 #endif
353 if (has_index_u4())
354 return get_index_u4(); // invokedynamic
355 return get_index_u2_cpcache();
356 }
357
358 // ------------------------------------------------------------------
359 // ciBytecodeStream::get_method
360 //
361 // If this is a method invocation bytecode, get the invoked method.
362 // Additionally return the declared signature to get more concrete
363 // type information if required (Cf. invokedynamic and invokehandle).
364 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {
365 VM_ENTRY_MARK;
366 ciEnv* env = CURRENT_ENV;
367 constantPoolHandle cpool(THREAD, _method->get_Method()->constants());
368 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
369 will_link = m->is_loaded();
370
371 // Use the MethodType stored in the CP cache to create a signature
372 // with correct types (in respect to class loaders).
373 if (has_method_type()) {
374 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index(cpool)));
375 ciKlass* pool_holder = env->get_klass(cpool->pool_holder());
376 ciMethodType* method_type = get_method_type();
377 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type);
378 (*declared_signature_result) = declared_signature;
379 } else {
380 (*declared_signature_result) = m->signature();
381 }
382 return m;
383 }
384
385 // ------------------------------------------------------------------
386 // ciBytecodeStream::has_appendix
387 //
388 // Returns true if there is an appendix argument stored in the
389 // constant pool cache at the current bci.
390 bool ciBytecodeStream::has_appendix() {
391 VM_ENTRY_MARK;
392 constantPoolHandle cpool(_method->get_Method()->constants());
393 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());
394 }
395
396 // ------------------------------------------------------------------
397 // ciBytecodeStream::get_appendix
398 //
399 // Return the appendix argument stored in the constant pool cache at
400 // the current bci.
401 ciObject* ciBytecodeStream::get_appendix() {
402 VM_ENTRY_MARK;
403 constantPoolHandle cpool(_method->get_Method()->constants());
404 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());
405 return CURRENT_ENV->get_object(appendix_oop);
406 }
407
408 // ------------------------------------------------------------------
409 // ciBytecodeStream::has_method_type
410 //
411 // Returns true if there is a MethodType argument stored in the
412 // constant pool cache at the current bci.
413 bool ciBytecodeStream::has_method_type() {
414 GUARDED_VM_ENTRY(
415 constantPoolHandle cpool(_method->get_Method()->constants());
416 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index());
417 )
418 }
419
420 // ------------------------------------------------------------------
421 // ciBytecodeStream::get_method_type
422 //
423 // Return the MethodType stored in the constant pool cache at
424 // the current bci.
425 ciMethodType* ciBytecodeStream::get_method_type() {
426 GUARDED_VM_ENTRY(
427 constantPoolHandle cpool(_method->get_Method()->constants());
428 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index());
429 return CURRENT_ENV->get_object(method_type_oop)->as_method_type();
430 )
431 }
432
433 // ------------------------------------------------------------------
434 // ciBytecodeStream::get_declared_method_holder
435 //
436 // Get the declared holder of the currently referenced method.
437 //
438 // Usage note: the holder() of a ciMethod class returns the canonical
439 // holder of the method, rather than the holder declared in the
440 // bytecodes.
441 //
442 // There is no "will_link" result passed back. The user is responsible
443 // for checking linkability when retrieving the associated method.
444 ciKlass* ciBytecodeStream::get_declared_method_holder() {
445 VM_ENTRY_MARK;
446 constantPoolHandle cpool(_method->get_Method()->constants());
447 bool ignore;
448 // report as MethodHandle for invokedynamic, which is syntactically classless
449 if (cur_bc() == Bytecodes::_invokedynamic)
450 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false);
451 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
452 }
453
454 // ------------------------------------------------------------------
455 // ciBytecodeStream::get_method_holder_index
456 //
457 // Get the constant pool index of the declared holder of the method
458 // referenced by the current bytecode. Used for generating
459 // deoptimization information.
460 int ciBytecodeStream::get_method_holder_index() {
461 ConstantPool* cpool = _method->get_Method()->constants();
462 return cpool->klass_ref_index_at(get_method_index());
463 }
464
465 // ------------------------------------------------------------------
466 // ciBytecodeStream::get_method_signature_index
467 //
468 // Get the constant pool index of the signature of the method
469 // referenced by the current bytecode. Used for generating
470 // deoptimization information.
471 int ciBytecodeStream::get_method_signature_index(const constantPoolHandle& cpool) {
472 GUARDED_VM_ENTRY(
473 const int method_index = get_method_index();
474 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
475 return cpool->signature_ref_index_at(name_and_type_index);
476 )
477 }
478
479 // ------------------------------------------------------------------
480 // ciBytecodeStream::get_resolved_references
481 ciObjArray* ciBytecodeStream::get_resolved_references() {
482 VM_ENTRY_MARK;
483 // Get the constant pool.
484 ConstantPool* cpool = _holder->get_instanceKlass()->constants();
485
486 // Create a resolved references array and return it.
487 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();
488 }