Mercurial > hg > truffle
annotate src/share/vm/ci/ciStreams.cpp @ 1565:ab102d5d923e
6939207: refactor constant pool index processing
Summary: Factored cleanup of instruction decode which prepares for enhanced ldc semantics.
Reviewed-by: twisti
author | jrose |
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date | Sun, 23 May 2010 01:38:26 -0700 |
parents | dd57230ba8fe |
children | e9ff18c4ace7 |
rev | line source |
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0 | 1 /* |
1565 | 2 * Copyright 1999-2010 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_ciStreams.cpp.incl" | |
27 | |
28 // ciExceptionHandlerStream | |
29 // | |
30 // Walk over some selected set of a methods exception handlers. | |
31 | |
32 // ------------------------------------------------------------------ | |
33 // ciExceptionHandlerStream::count | |
34 // | |
35 // How many exception handlers are there in this stream? | |
36 // | |
37 // Implementation note: Compiler2 needs this functionality, so I had | |
38 int ciExceptionHandlerStream::count() { | |
39 int save_pos = _pos; | |
40 int save_end = _end; | |
41 | |
42 int count = 0; | |
43 | |
44 _pos = -1; | |
45 _end = _method->_handler_count; | |
46 | |
47 | |
48 next(); | |
49 while (!is_done()) { | |
50 count++; | |
51 next(); | |
52 } | |
53 | |
54 _pos = save_pos; | |
55 _end = save_end; | |
56 | |
57 return count; | |
58 } | |
59 | |
60 int ciExceptionHandlerStream::count_remaining() { | |
61 int save_pos = _pos; | |
62 int save_end = _end; | |
63 | |
64 int count = 0; | |
65 | |
66 while (!is_done()) { | |
67 count++; | |
68 next(); | |
69 } | |
70 | |
71 _pos = save_pos; | |
72 _end = save_end; | |
73 | |
74 return count; | |
75 } | |
76 | |
77 // ciBytecodeStream | |
78 // | |
79 // The class is used to iterate over the bytecodes of a method. | |
80 // It hides the details of constant pool structure/access by | |
81 // providing accessors for constant pool items. | |
82 | |
83 // ------------------------------------------------------------------ | |
1565 | 84 // ciBytecodeStream::next_wide_or_table |
0 | 85 // |
86 // Special handling for switch ops | |
1565 | 87 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) { |
88 switch (bc) { // Check for special bytecode handling | |
89 case Bytecodes::_wide: | |
90 // Special handling for the wide bytcode | |
91 // Get following bytecode; do not return wide | |
92 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, ""); | |
93 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]); | |
94 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress"); | |
95 _pc += Bytecodes::wide_length_for(bc); | |
96 _was_wide = _pc; // Flag last wide bytecode found | |
97 assert(is_wide(), "accessor works right"); | |
98 break; | |
0 | 99 |
100 case Bytecodes::_lookupswitch: | |
101 _pc++; // Skip wide bytecode | |
102 _pc += (_start-_pc)&3; // Word align | |
103 _table_base = (jint*)_pc; // Capture for later usage | |
104 // table_base[0] is default far_dest | |
105 // Table has 2 lead elements (default, length), then pairs of u4 values. | |
106 // So load table length, and compute address at end of table | |
107 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; | |
108 break; | |
109 | |
110 case Bytecodes::_tableswitch: { | |
111 _pc++; // Skip wide bytecode | |
112 _pc += (_start-_pc)&3; // Word align | |
113 _table_base = (jint*)_pc; // Capture for later usage | |
114 // table_base[0] is default far_dest | |
115 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound | |
116 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound | |
117 int len = hi - lo + 1; // Dense table size | |
118 _pc = (address)&_table_base[3+len]; // Skip past table | |
119 break; | |
120 } | |
121 | |
122 default: | |
123 fatal("unhandled bytecode"); | |
124 } | |
125 return bc; | |
126 } | |
127 | |
128 // ------------------------------------------------------------------ | |
129 // ciBytecodeStream::reset_to_bci | |
130 void ciBytecodeStream::reset_to_bci( int bci ) { | |
131 _bc_start=_was_wide=0; | |
132 _pc = _start+bci; | |
133 } | |
134 | |
135 // ------------------------------------------------------------------ | |
136 // ciBytecodeStream::force_bci | |
137 void ciBytecodeStream::force_bci(int bci) { | |
138 if (bci < 0) { | |
139 reset_to_bci(0); | |
140 _bc_start = _start + bci; | |
141 _bc = EOBC(); | |
142 } else { | |
143 reset_to_bci(bci); | |
144 next(); | |
145 } | |
146 } | |
147 | |
148 | |
149 // ------------------------------------------------------------------ | |
150 // Constant pool access | |
151 // ------------------------------------------------------------------ | |
152 | |
153 // ------------------------------------------------------------------ | |
154 // ciBytecodeStream::get_klass_index | |
155 // | |
156 // If this bytecodes references a klass, return the index of the | |
157 // referenced klass. | |
158 int ciBytecodeStream::get_klass_index() const { | |
159 switch(cur_bc()) { | |
160 case Bytecodes::_ldc: | |
1565 | 161 return get_index_u1(); |
0 | 162 case Bytecodes::_ldc_w: |
163 case Bytecodes::_ldc2_w: | |
164 case Bytecodes::_checkcast: | |
165 case Bytecodes::_instanceof: | |
166 case Bytecodes::_anewarray: | |
167 case Bytecodes::_multianewarray: | |
168 case Bytecodes::_new: | |
169 case Bytecodes::_newarray: | |
1565 | 170 return get_index_u2(); |
0 | 171 default: |
172 ShouldNotReachHere(); | |
173 return 0; | |
174 } | |
175 } | |
176 | |
177 // ------------------------------------------------------------------ | |
178 // ciBytecodeStream::get_klass | |
179 // | |
180 // If this bytecode is a new, newarray, multianewarray, instanceof, | |
181 // or checkcast, get the referenced klass. | |
182 ciKlass* ciBytecodeStream::get_klass(bool& will_link) { | |
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183 VM_ENTRY_MARK; |
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184 constantPoolHandle cpool(_method->get_methodOop()->constants()); |
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185 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); |
0 | 186 } |
187 | |
188 // ------------------------------------------------------------------ | |
189 // ciBytecodeStream::get_constant_index | |
190 // | |
191 // If this bytecode is one of the ldc variants, get the index of the | |
192 // referenced constant. | |
193 int ciBytecodeStream::get_constant_index() const { | |
194 switch(cur_bc()) { | |
195 case Bytecodes::_ldc: | |
1565 | 196 return get_index_u1(); |
0 | 197 case Bytecodes::_ldc_w: |
198 case Bytecodes::_ldc2_w: | |
1565 | 199 return get_index_u2(); |
0 | 200 default: |
201 ShouldNotReachHere(); | |
202 return 0; | |
203 } | |
204 } | |
205 // ------------------------------------------------------------------ | |
206 // ciBytecodeStream::get_constant | |
207 // | |
208 // If this bytecode is one of the ldc variants, get the referenced | |
209 // constant. | |
210 ciConstant ciBytecodeStream::get_constant() { | |
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211 VM_ENTRY_MARK; |
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212 constantPoolHandle cpool(_method->get_methodOop()->constants()); |
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213 return CURRENT_ENV->get_constant_by_index(cpool, get_constant_index(), _holder); |
0 | 214 } |
215 | |
216 // ------------------------------------------------------------------ | |
217 bool ciBytecodeStream::is_unresolved_string() const { | |
218 return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index()); | |
219 } | |
220 | |
221 // ------------------------------------------------------------------ | |
222 bool ciBytecodeStream::is_unresolved_klass() const { | |
223 return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index()); | |
224 } | |
225 | |
226 // ------------------------------------------------------------------ | |
227 // ciBytecodeStream::get_field_index | |
228 // | |
229 // If this is a field access bytecode, get the constant pool | |
230 // index of the referenced field. | |
231 int ciBytecodeStream::get_field_index() { | |
232 assert(cur_bc() == Bytecodes::_getfield || | |
233 cur_bc() == Bytecodes::_putfield || | |
234 cur_bc() == Bytecodes::_getstatic || | |
235 cur_bc() == Bytecodes::_putstatic, "wrong bc"); | |
1565 | 236 return get_index_u2_cpcache(); |
0 | 237 } |
238 | |
239 | |
240 // ------------------------------------------------------------------ | |
241 // ciBytecodeStream::get_field | |
242 // | |
243 // If this bytecode is one of get_field, get_static, put_field, | |
244 // or put_static, get the referenced field. | |
245 ciField* ciBytecodeStream::get_field(bool& will_link) { | |
246 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); | |
247 will_link = f->will_link(_holder, _bc); | |
248 return f; | |
249 } | |
250 | |
251 | |
252 // ------------------------------------------------------------------ | |
253 // ciBytecodeStream::get_declared_field_holder | |
254 // | |
255 // Get the declared holder of the currently referenced field. | |
256 // | |
257 // Usage note: the holder() of a ciField class returns the canonical | |
258 // holder of the field, rather than the holder declared in the | |
259 // bytecodes. | |
260 // | |
261 // There is no "will_link" result passed back. The user is responsible | |
262 // for checking linkability when retrieving the associated field. | |
263 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { | |
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264 VM_ENTRY_MARK; |
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265 constantPoolHandle cpool(_method->get_methodOop()->constants()); |
0 | 266 int holder_index = get_field_holder_index(); |
267 bool ignore; | |
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268 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) |
0 | 269 ->as_instance_klass(); |
270 } | |
271 | |
272 // ------------------------------------------------------------------ | |
273 // ciBytecodeStream::get_field_holder_index | |
274 // | |
275 // Get the constant pool index of the declared holder of the field | |
276 // referenced by the current bytecode. Used for generating | |
277 // deoptimization information. | |
278 int ciBytecodeStream::get_field_holder_index() { | |
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279 GUARDED_VM_ENTRY( |
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280 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); |
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281 return cpool->klass_ref_index_at(get_field_index()); |
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282 ) |
0 | 283 } |
284 | |
285 // ------------------------------------------------------------------ | |
286 // ciBytecodeStream::get_field_signature_index | |
287 // | |
288 // Get the constant pool index of the signature of the field | |
289 // referenced by the current bytecode. Used for generating | |
290 // deoptimization information. | |
291 int ciBytecodeStream::get_field_signature_index() { | |
292 VM_ENTRY_MARK; | |
293 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); | |
294 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); | |
295 return cpool->signature_ref_index_at(nt_index); | |
296 } | |
297 | |
298 // ------------------------------------------------------------------ | |
299 // ciBytecodeStream::get_method_index | |
300 // | |
301 // If this is a method invocation bytecode, get the constant pool | |
302 // index of the invoked method. | |
303 int ciBytecodeStream::get_method_index() { | |
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304 #ifdef ASSERT |
0 | 305 switch (cur_bc()) { |
306 case Bytecodes::_invokeinterface: | |
307 case Bytecodes::_invokevirtual: | |
308 case Bytecodes::_invokespecial: | |
309 case Bytecodes::_invokestatic: | |
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310 case Bytecodes::_invokedynamic: |
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311 break; |
0 | 312 default: |
313 ShouldNotReachHere(); | |
314 } | |
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315 #endif |
1565 | 316 if (has_index_u4()) |
317 return get_index_u4(); // invokedynamic | |
318 return get_index_u2_cpcache(); | |
0 | 319 } |
320 | |
321 // ------------------------------------------------------------------ | |
322 // ciBytecodeStream::get_method | |
323 // | |
324 // If this is a method invocation bytecode, get the invoked method. | |
325 ciMethod* ciBytecodeStream::get_method(bool& will_link) { | |
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326 VM_ENTRY_MARK; |
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327 constantPoolHandle cpool(_method->get_methodOop()->constants()); |
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328 ciMethod* m = CURRENT_ENV->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); |
0 | 329 will_link = m->is_loaded(); |
330 return m; | |
331 } | |
332 | |
333 // ------------------------------------------------------------------ | |
334 // ciBytecodeStream::get_declared_method_holder | |
335 // | |
336 // Get the declared holder of the currently referenced method. | |
337 // | |
338 // Usage note: the holder() of a ciMethod class returns the canonical | |
339 // holder of the method, rather than the holder declared in the | |
340 // bytecodes. | |
341 // | |
342 // There is no "will_link" result passed back. The user is responsible | |
343 // for checking linkability when retrieving the associated method. | |
344 ciKlass* ciBytecodeStream::get_declared_method_holder() { | |
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345 VM_ENTRY_MARK; |
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346 constantPoolHandle cpool(_method->get_methodOop()->constants()); |
0 | 347 bool ignore; |
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348 // report as InvokeDynamic for invokedynamic, which is syntactically classless |
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349 if (cur_bc() == Bytecodes::_invokedynamic) |
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350 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_InvokeDynamic(), false); |
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351 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); |
0 | 352 } |
353 | |
354 // ------------------------------------------------------------------ | |
355 // ciBytecodeStream::get_method_holder_index | |
356 // | |
357 // Get the constant pool index of the declared holder of the method | |
358 // referenced by the current bytecode. Used for generating | |
359 // deoptimization information. | |
360 int ciBytecodeStream::get_method_holder_index() { | |
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361 constantPoolOop cpool = _method->get_methodOop()->constants(); |
0 | 362 return cpool->klass_ref_index_at(get_method_index()); |
363 } | |
364 | |
365 // ------------------------------------------------------------------ | |
366 // ciBytecodeStream::get_method_signature_index | |
367 // | |
368 // Get the constant pool index of the signature of the method | |
369 // referenced by the current bytecode. Used for generating | |
370 // deoptimization information. | |
371 int ciBytecodeStream::get_method_signature_index() { | |
372 VM_ENTRY_MARK; | |
373 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); | |
374 int method_index = get_method_index(); | |
375 int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); | |
376 return cpool->signature_ref_index_at(name_and_type_index); | |
377 } | |
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378 |
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379 // ------------------------------------------------------------------ |
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380 // ciBytecodeStream::get_cpcache |
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381 ciCPCache* ciBytecodeStream::get_cpcache() { |
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382 VM_ENTRY_MARK; |
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383 // Get the constant pool. |
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384 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); |
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385 constantPoolCacheOop cpcache = cpool->cache(); |
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386 |
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387 return CURRENT_ENV->get_object(cpcache)->as_cpcache(); |
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388 } |
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389 |
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390 // ------------------------------------------------------------------ |
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391 // ciBytecodeStream::get_call_site |
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392 ciCallSite* ciBytecodeStream::get_call_site() { |
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393 VM_ENTRY_MARK; |
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394 // Get the constant pool. |
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395 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); |
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396 constantPoolCacheOop cpcache = cpool->cache(); |
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397 |
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398 // Get the CallSite from the constant pool cache. |
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399 int method_index = get_method_index(); |
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400 ConstantPoolCacheEntry* cpcache_entry = cpcache->secondary_entry_at(method_index); |
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401 oop call_site_oop = cpcache_entry->f1(); |
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402 |
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403 // Create a CallSite object and return it. |
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404 return CURRENT_ENV->get_object(call_site_oop)->as_call_site(); |
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405 } |