Mercurial > hg > truffle
annotate src/share/vm/ci/ciStreams.cpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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" | |
0 | 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 // ------------------------------------------------------------------ | |
1565 | 88 // ciBytecodeStream::next_wide_or_table |
0 | 89 // |
90 // Special handling for switch ops | |
1565 | 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; | |
0 | 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: | |
1565 | 165 return get_index_u1(); |
0 | 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: | |
1565 | 174 return get_index_u2(); |
0 | 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) { | |
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187 VM_ENTRY_MARK; |
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188 constantPoolHandle cpool(_method->get_Method()->constants()); |
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189 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); |
0 | 190 } |
191 | |
192 // ------------------------------------------------------------------ | |
1602 | 193 // ciBytecodeStream::get_constant_raw_index |
0 | 194 // |
195 // If this bytecode is one of the ldc variants, get the index of the | |
196 // referenced constant. | |
1602 | 197 int ciBytecodeStream::get_constant_raw_index() const { |
198 // work-alike for Bytecode_loadconstant::raw_index() | |
199 switch (cur_bc()) { | |
0 | 200 case Bytecodes::_ldc: |
1565 | 201 return get_index_u1(); |
0 | 202 case Bytecodes::_ldc_w: |
203 case Bytecodes::_ldc2_w: | |
1565 | 204 return get_index_u2(); |
0 | 205 default: |
206 ShouldNotReachHere(); | |
207 return 0; | |
208 } | |
209 } | |
1602 | 210 |
211 // ------------------------------------------------------------------ | |
212 // ciBytecodeStream::get_constant_pool_index | |
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213 // Decode any reference index into a regular pool index. |
1602 | 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()) { | |
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218 VM_ENTRY_MARK; |
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219 constantPoolHandle cpool(_method->get_Method()->constants()); |
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220 return cpool->object_to_cp_index(index); |
1602 | 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 | |
0 | 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() { | |
1602 | 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 } | |
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245 VM_ENTRY_MARK; |
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246 constantPoolHandle cpool(_method->get_Method()->constants()); |
1602 | 247 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder); |
0 | 248 } |
249 | |
250 // ------------------------------------------------------------------ | |
1602 | 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; | |
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257 return _method->get_Method()->constants()->tag_at(index); |
0 | 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"); | |
1565 | 270 return get_index_u2_cpcache(); |
0 | 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() { | |
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298 VM_ENTRY_MARK; |
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299 constantPoolHandle cpool(_method->get_Method()->constants()); |
0 | 300 int holder_index = get_field_holder_index(); |
301 bool ignore; | |
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302 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) |
0 | 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() { | |
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313 GUARDED_VM_ENTRY( |
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314 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); |
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315 return cpool->klass_ref_index_at(get_field_index()); |
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316 ) |
0 | 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; | |
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327 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); |
0 | 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() { | |
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338 #ifdef ASSERT |
0 | 339 switch (cur_bc()) { |
340 case Bytecodes::_invokeinterface: | |
341 case Bytecodes::_invokevirtual: | |
342 case Bytecodes::_invokespecial: | |
343 case Bytecodes::_invokestatic: | |
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344 case Bytecodes::_invokedynamic: |
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345 break; |
0 | 346 default: |
347 ShouldNotReachHere(); | |
348 } | |
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349 #endif |
1565 | 350 if (has_index_u4()) |
351 return get_index_u4(); // invokedynamic | |
352 return get_index_u2_cpcache(); | |
0 | 353 } |
354 | |
355 // ------------------------------------------------------------------ | |
356 // ciBytecodeStream::get_method | |
357 // | |
358 // If this is a method invocation bytecode, get the invoked method. | |
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359 // Additionally return the declared signature to get more concrete |
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360 // type information if required (Cf. invokedynamic and invokehandle). |
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361 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) { |
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362 VM_ENTRY_MARK; |
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363 ciEnv* env = CURRENT_ENV; |
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364 constantPoolHandle cpool(_method->get_Method()->constants()); |
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365 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); |
0 | 366 will_link = m->is_loaded(); |
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367 |
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368 // Use the MethodType stored in the CP cache to create a signature |
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369 // with correct types (in respect to class loaders). |
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370 if (has_method_type()) { |
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371 ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index())); |
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372 ciKlass* pool_holder = env->get_klass(cpool->pool_holder()); |
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373 ciMethodType* method_type = get_method_type(); |
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374 ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type); |
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375 (*declared_signature_result) = declared_signature; |
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376 } else { |
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377 (*declared_signature_result) = m->signature(); |
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378 } |
0 | 379 return m; |
380 } | |
381 | |
382 // ------------------------------------------------------------------ | |
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383 // ciBytecodeStream::has_appendix |
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384 // |
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385 // Returns true if there is an appendix argument stored in the |
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386 // constant pool cache at the current bci. |
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387 bool ciBytecodeStream::has_appendix() { |
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388 VM_ENTRY_MARK; |
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389 constantPoolHandle cpool(_method->get_Method()->constants()); |
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390 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index()); |
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391 } |
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392 |
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393 // ------------------------------------------------------------------ |
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394 // ciBytecodeStream::get_appendix |
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395 // |
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396 // Return the appendix argument stored in the constant pool cache at |
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397 // the current bci. |
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398 ciObject* ciBytecodeStream::get_appendix() { |
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399 VM_ENTRY_MARK; |
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400 constantPoolHandle cpool(_method->get_Method()->constants()); |
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401 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index()); |
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402 return CURRENT_ENV->get_object(appendix_oop); |
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403 } |
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404 |
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405 // ------------------------------------------------------------------ |
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406 // ciBytecodeStream::has_method_type |
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407 // |
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408 // Returns true if there is a MethodType argument stored in the |
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409 // constant pool cache at the current bci. |
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410 bool ciBytecodeStream::has_method_type() { |
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411 GUARDED_VM_ENTRY( |
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412 constantPoolHandle cpool(_method->get_Method()->constants()); |
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413 return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index()); |
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414 ) |
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415 } |
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416 |
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417 // ------------------------------------------------------------------ |
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418 // ciBytecodeStream::get_method_type |
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419 // |
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420 // Return the MethodType stored in the constant pool cache at |
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421 // the current bci. |
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422 ciMethodType* ciBytecodeStream::get_method_type() { |
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423 GUARDED_VM_ENTRY( |
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424 constantPoolHandle cpool(_method->get_Method()->constants()); |
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425 oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index()); |
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426 return CURRENT_ENV->get_object(method_type_oop)->as_method_type(); |
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427 ) |
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428 } |
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429 |
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430 // ------------------------------------------------------------------ |
0 | 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() { | |
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442 VM_ENTRY_MARK; |
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443 constantPoolHandle cpool(_method->get_Method()->constants()); |
0 | 444 bool ignore; |
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445 // report as MethodHandle for invokedynamic, which is syntactically classless |
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446 if (cur_bc() == Bytecodes::_invokedynamic) |
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447 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false); |
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448 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); |
0 | 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() { | |
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458 ConstantPool* cpool = _method->get_Method()->constants(); |
0 | 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() { | |
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469 GUARDED_VM_ENTRY( |
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470 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); |
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471 const int method_index = get_method_index(); |
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472 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); |
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473 return cpool->signature_ref_index_at(name_and_type_index); |
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474 ) |
0 | 475 } |
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476 |
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477 // ------------------------------------------------------------------ |
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478 // ciBytecodeStream::get_resolved_references |
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479 ciObjArray* ciBytecodeStream::get_resolved_references() { |
1602 | 480 VM_ENTRY_MARK; |
481 // Get the constant pool. | |
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482 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); |
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483 |
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484 // Create a resolved references array and return it. |
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485 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array(); |
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486 } |