Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciEnv.cpp @ 1080:7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 12 Nov 2009 09:24:21 -0800 |
parents | 389049f3f393 |
children | 97125851f396 |
rev | line source |
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0 | 1 /* |
844 | 2 * Copyright 1999-2009 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/_ciEnv.cpp.incl" | |
27 | |
28 // ciEnv | |
29 // | |
30 // This class is the top level broker for requests from the compiler | |
31 // to the VM. | |
32 | |
33 ciObject* ciEnv::_null_object_instance; | |
34 ciMethodKlass* ciEnv::_method_klass_instance; | |
35 ciSymbolKlass* ciEnv::_symbol_klass_instance; | |
36 ciKlassKlass* ciEnv::_klass_klass_instance; | |
37 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; | |
38 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; | |
39 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; | |
40 | |
41 ciInstanceKlass* ciEnv::_ArrayStoreException; | |
42 ciInstanceKlass* ciEnv::_Class; | |
43 ciInstanceKlass* ciEnv::_ClassCastException; | |
44 ciInstanceKlass* ciEnv::_Object; | |
45 ciInstanceKlass* ciEnv::_Throwable; | |
46 ciInstanceKlass* ciEnv::_Thread; | |
47 ciInstanceKlass* ciEnv::_OutOfMemoryError; | |
48 ciInstanceKlass* ciEnv::_String; | |
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49 ciInstanceKlass* ciEnv::_StringBuffer; |
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50 ciInstanceKlass* ciEnv::_StringBuilder; |
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51 ciInstanceKlass* ciEnv::_Integer; |
0 | 52 |
53 ciSymbol* ciEnv::_unloaded_cisymbol = NULL; | |
54 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; | |
55 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; | |
56 | |
57 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; | |
58 jobject ciEnv::_ArrayStoreException_handle = NULL; | |
59 jobject ciEnv::_ClassCastException_handle = NULL; | |
60 | |
61 #ifndef PRODUCT | |
62 static bool firstEnv = true; | |
63 #endif /* PRODUCT */ | |
64 | |
65 // ------------------------------------------------------------------ | |
66 // ciEnv::ciEnv | |
67 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { | |
68 VM_ENTRY_MARK; | |
69 | |
70 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. | |
71 thread->set_env(this); | |
72 assert(ciEnv::current() == this, "sanity"); | |
73 | |
74 _oop_recorder = NULL; | |
75 _debug_info = NULL; | |
76 _dependencies = NULL; | |
77 _failure_reason = NULL; | |
78 _compilable = MethodCompilable; | |
79 _break_at_compile = false; | |
80 _compiler_data = NULL; | |
81 #ifndef PRODUCT | |
82 assert(!firstEnv, "not initialized properly"); | |
83 #endif /* !PRODUCT */ | |
84 | |
85 _system_dictionary_modification_counter = system_dictionary_modification_counter; | |
86 _num_inlined_bytecodes = 0; | |
87 assert(task == NULL || thread->task() == task, "sanity"); | |
88 _task = task; | |
89 _log = NULL; | |
90 | |
91 // Temporary buffer for creating symbols and such. | |
92 _name_buffer = NULL; | |
93 _name_buffer_len = 0; | |
94 | |
95 _arena = &_ciEnv_arena; | |
96 _factory = new (_arena) ciObjectFactory(_arena, 128); | |
97 | |
98 // Preload commonly referenced system ciObjects. | |
99 | |
100 // During VM initialization, these instances have not yet been created. | |
101 // Assertions ensure that these instances are not accessed before | |
102 // their initialization. | |
103 | |
104 assert(Universe::is_fully_initialized(), "should be complete"); | |
105 | |
106 oop o = Universe::null_ptr_exception_instance(); | |
107 assert(o != NULL, "should have been initialized"); | |
108 _NullPointerException_instance = get_object(o)->as_instance(); | |
109 o = Universe::arithmetic_exception_instance(); | |
110 assert(o != NULL, "should have been initialized"); | |
111 _ArithmeticException_instance = get_object(o)->as_instance(); | |
112 | |
113 _ArrayIndexOutOfBoundsException_instance = NULL; | |
114 _ArrayStoreException_instance = NULL; | |
115 _ClassCastException_instance = NULL; | |
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116 _the_null_string = NULL; |
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117 _the_min_jint_string = NULL; |
0 | 118 } |
119 | |
120 ciEnv::ciEnv(Arena* arena) { | |
121 ASSERT_IN_VM; | |
122 | |
123 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. | |
124 CompilerThread* current_thread = CompilerThread::current(); | |
125 assert(current_thread->env() == NULL, "must be"); | |
126 current_thread->set_env(this); | |
127 assert(ciEnv::current() == this, "sanity"); | |
128 | |
129 _oop_recorder = NULL; | |
130 _debug_info = NULL; | |
131 _dependencies = NULL; | |
132 _failure_reason = NULL; | |
133 _compilable = MethodCompilable_never; | |
134 _break_at_compile = false; | |
135 _compiler_data = NULL; | |
136 #ifndef PRODUCT | |
137 assert(firstEnv, "must be first"); | |
138 firstEnv = false; | |
139 #endif /* !PRODUCT */ | |
140 | |
141 _system_dictionary_modification_counter = 0; | |
142 _num_inlined_bytecodes = 0; | |
143 _task = NULL; | |
144 _log = NULL; | |
145 | |
146 // Temporary buffer for creating symbols and such. | |
147 _name_buffer = NULL; | |
148 _name_buffer_len = 0; | |
149 | |
150 _arena = arena; | |
151 _factory = new (_arena) ciObjectFactory(_arena, 128); | |
152 | |
153 // Preload commonly referenced system ciObjects. | |
154 | |
155 // During VM initialization, these instances have not yet been created. | |
156 // Assertions ensure that these instances are not accessed before | |
157 // their initialization. | |
158 | |
159 assert(Universe::is_fully_initialized(), "must be"); | |
160 | |
161 oop o = Universe::null_ptr_exception_instance(); | |
162 assert(o != NULL, "should have been initialized"); | |
163 _NullPointerException_instance = get_object(o)->as_instance(); | |
164 o = Universe::arithmetic_exception_instance(); | |
165 assert(o != NULL, "should have been initialized"); | |
166 _ArithmeticException_instance = get_object(o)->as_instance(); | |
167 | |
168 _ArrayIndexOutOfBoundsException_instance = NULL; | |
169 _ArrayStoreException_instance = NULL; | |
170 _ClassCastException_instance = NULL; | |
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171 _the_null_string = NULL; |
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172 _the_min_jint_string = NULL; |
0 | 173 } |
174 | |
175 ciEnv::~ciEnv() { | |
176 CompilerThread* current_thread = CompilerThread::current(); | |
177 current_thread->set_env(NULL); | |
178 } | |
179 | |
180 // ------------------------------------------------------------------ | |
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181 // Cache Jvmti state |
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182 void ciEnv::cache_jvmti_state() { |
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183 VM_ENTRY_MARK; |
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184 // Get Jvmti capabilities under lock to get consistant values. |
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185 MutexLocker mu(JvmtiThreadState_lock); |
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186 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); |
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187 _jvmti_can_examine_or_deopt_anywhere = JvmtiExport::can_examine_or_deopt_anywhere(); |
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188 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); |
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189 _jvmti_can_post_exceptions = JvmtiExport::can_post_exceptions(); |
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190 } |
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191 |
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192 // ------------------------------------------------------------------ |
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193 // Cache DTrace flags |
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194 void ciEnv::cache_dtrace_flags() { |
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195 // Need lock? |
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196 _dtrace_extended_probes = ExtendedDTraceProbes; |
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197 if (_dtrace_extended_probes) { |
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198 _dtrace_monitor_probes = true; |
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199 _dtrace_method_probes = true; |
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200 _dtrace_alloc_probes = true; |
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201 } else { |
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202 _dtrace_monitor_probes = DTraceMonitorProbes; |
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203 _dtrace_method_probes = DTraceMethodProbes; |
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204 _dtrace_alloc_probes = DTraceAllocProbes; |
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205 } |
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206 } |
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207 |
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208 // ------------------------------------------------------------------ |
0 | 209 // helper for lazy exception creation |
210 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { | |
211 VM_ENTRY_MARK; | |
212 if (handle == NULL) { | |
213 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. | |
214 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); | |
215 jobject objh = NULL; | |
216 if (!HAS_PENDING_EXCEPTION && k != NULL) { | |
217 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); | |
218 if (!HAS_PENDING_EXCEPTION) | |
219 objh = JNIHandles::make_global(obj); | |
220 } | |
221 if (HAS_PENDING_EXCEPTION) { | |
222 CLEAR_PENDING_EXCEPTION; | |
223 } else { | |
224 handle = objh; | |
225 } | |
226 } | |
227 oop obj = JNIHandles::resolve(handle); | |
228 return obj == NULL? NULL: get_object(obj)->as_instance(); | |
229 } | |
230 | |
231 // ------------------------------------------------------------------ | |
232 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. | |
233 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { | |
234 if (_ArrayIndexOutOfBoundsException_instance == NULL) { | |
235 _ArrayIndexOutOfBoundsException_instance | |
236 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, | |
237 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); | |
238 } | |
239 return _ArrayIndexOutOfBoundsException_instance; | |
240 } | |
241 ciInstance* ciEnv::ArrayStoreException_instance() { | |
242 if (_ArrayStoreException_instance == NULL) { | |
243 _ArrayStoreException_instance | |
244 = get_or_create_exception(_ArrayStoreException_handle, | |
245 vmSymbolHandles::java_lang_ArrayStoreException()); | |
246 } | |
247 return _ArrayStoreException_instance; | |
248 } | |
249 ciInstance* ciEnv::ClassCastException_instance() { | |
250 if (_ClassCastException_instance == NULL) { | |
251 _ClassCastException_instance | |
252 = get_or_create_exception(_ClassCastException_handle, | |
253 vmSymbolHandles::java_lang_ClassCastException()); | |
254 } | |
255 return _ClassCastException_instance; | |
256 } | |
257 | |
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258 ciInstance* ciEnv::the_null_string() { |
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259 if (_the_null_string == NULL) { |
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260 VM_ENTRY_MARK; |
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261 _the_null_string = get_object(Universe::the_null_string())->as_instance(); |
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262 } |
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263 return _the_null_string; |
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264 } |
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265 |
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266 ciInstance* ciEnv::the_min_jint_string() { |
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267 if (_the_min_jint_string == NULL) { |
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268 VM_ENTRY_MARK; |
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269 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); |
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270 } |
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271 return _the_min_jint_string; |
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272 } |
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273 |
0 | 274 // ------------------------------------------------------------------ |
275 // ciEnv::get_method_from_handle | |
276 ciMethod* ciEnv::get_method_from_handle(jobject method) { | |
277 VM_ENTRY_MARK; | |
278 return get_object(JNIHandles::resolve(method))->as_method(); | |
279 } | |
280 | |
281 // ------------------------------------------------------------------ | |
282 // ciEnv::make_array | |
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283 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { |
0 | 284 VM_ENTRY_MARK; |
285 int length = objects->length(); | |
286 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); | |
287 if (HAS_PENDING_EXCEPTION) { | |
288 CLEAR_PENDING_EXCEPTION; | |
289 record_out_of_memory_failure(); | |
290 return NULL; | |
291 } | |
292 for (int i = 0; i < length; i++) { | |
293 a->obj_at_put(i, objects->at(i)->get_oop()); | |
294 } | |
295 assert(a->is_perm(), ""); | |
296 return get_object(a)->as_array(); | |
297 } | |
298 | |
299 | |
300 // ------------------------------------------------------------------ | |
301 // ciEnv::array_element_offset_in_bytes | |
302 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { | |
303 VM_ENTRY_MARK; | |
304 objArrayOop a = (objArrayOop)a_h->get_oop(); | |
305 assert(a->is_objArray(), ""); | |
306 int length = a->length(); | |
307 oop o = o_h->get_oop(); | |
308 for (int i = 0; i < length; i++) { | |
309 if (a->obj_at(i) == o) return i; | |
310 } | |
311 return -1; | |
312 } | |
313 | |
314 | |
315 // ------------------------------------------------------------------ | |
316 // ciEnv::check_klass_accessiblity | |
317 // | |
318 // Note: the logic of this method should mirror the logic of | |
319 // constantPoolOopDesc::verify_constant_pool_resolve. | |
320 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, | |
321 klassOop resolved_klass) { | |
322 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { | |
323 return true; | |
324 } | |
325 if (accessing_klass->is_obj_array()) { | |
326 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); | |
327 } | |
328 if (!accessing_klass->is_instance_klass()) { | |
329 return true; | |
330 } | |
331 | |
332 if (resolved_klass->klass_part()->oop_is_objArray()) { | |
333 // Find the element klass, if this is an array. | |
334 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); | |
335 } | |
336 if (resolved_klass->klass_part()->oop_is_instance()) { | |
337 return Reflection::verify_class_access(accessing_klass->get_klassOop(), | |
338 resolved_klass, | |
339 true); | |
340 } | |
341 return true; | |
342 } | |
343 | |
344 // ------------------------------------------------------------------ | |
345 // ciEnv::get_klass_by_name_impl | |
346 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, | |
347 ciSymbol* name, | |
348 bool require_local) { | |
349 ASSERT_IN_VM; | |
350 EXCEPTION_CONTEXT; | |
351 | |
352 // Now we need to check the SystemDictionary | |
353 symbolHandle sym(THREAD, name->get_symbolOop()); | |
354 if (sym->byte_at(0) == 'L' && | |
355 sym->byte_at(sym->utf8_length()-1) == ';') { | |
356 // This is a name from a signature. Strip off the trimmings. | |
357 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, | |
358 sym->utf8_length()-2, | |
359 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); | |
360 name = get_object(sym())->as_symbol(); | |
361 } | |
362 | |
363 // Check for prior unloaded klass. The SystemDictionary's answers | |
364 // can vary over time but the compiler needs consistency. | |
365 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); | |
366 if (unloaded_klass != NULL) { | |
367 if (require_local) return NULL; | |
368 return unloaded_klass; | |
369 } | |
370 | |
371 Handle loader(THREAD, (oop)NULL); | |
372 Handle domain(THREAD, (oop)NULL); | |
373 if (accessing_klass != NULL) { | |
374 loader = Handle(THREAD, accessing_klass->loader()); | |
375 domain = Handle(THREAD, accessing_klass->protection_domain()); | |
376 } | |
377 | |
378 // setup up the proper type to return on OOM | |
379 ciKlass* fail_type; | |
380 if (sym->byte_at(0) == '[') { | |
381 fail_type = _unloaded_ciobjarrayklass; | |
382 } else { | |
383 fail_type = _unloaded_ciinstance_klass; | |
384 } | |
385 klassOop found_klass; | |
386 if (!require_local) { | |
387 found_klass = | |
388 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, | |
389 KILL_COMPILE_ON_FATAL_(fail_type)); | |
390 } else { | |
391 found_klass = | |
392 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, | |
393 KILL_COMPILE_ON_FATAL_(fail_type)); | |
394 } | |
395 | |
396 if (found_klass != NULL) { | |
397 // Found it. Build a CI handle. | |
398 return get_object(found_klass)->as_klass(); | |
399 } | |
400 | |
401 // If we fail to find an array klass, look again for its element type. | |
402 // The element type may be available either locally or via constraints. | |
403 // In either case, if we can find the element type in the system dictionary, | |
404 // we must build an array type around it. The CI requires array klasses | |
405 // to be loaded if their element klasses are loaded, except when memory | |
406 // is exhausted. | |
407 if (sym->byte_at(0) == '[' && | |
408 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { | |
409 // We have an unloaded array. | |
410 // Build it on the fly if the element class exists. | |
411 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, | |
412 sym->utf8_length()-1, | |
413 KILL_COMPILE_ON_FATAL_(fail_type)); | |
414 // Get element ciKlass recursively. | |
415 ciKlass* elem_klass = | |
416 get_klass_by_name_impl(accessing_klass, | |
417 get_object(elem_sym)->as_symbol(), | |
418 require_local); | |
419 if (elem_klass != NULL && elem_klass->is_loaded()) { | |
420 // Now make an array for it | |
421 return ciObjArrayKlass::make_impl(elem_klass); | |
422 } | |
423 } | |
424 | |
425 if (require_local) return NULL; | |
426 // Not yet loaded into the VM, or not governed by loader constraints. | |
427 // Make a CI representative for it. | |
428 return get_unloaded_klass(accessing_klass, name); | |
429 } | |
430 | |
431 // ------------------------------------------------------------------ | |
432 // ciEnv::get_klass_by_name | |
433 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, | |
434 ciSymbol* klass_name, | |
435 bool require_local) { | |
436 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, | |
437 klass_name, | |
438 require_local);) | |
439 } | |
440 | |
441 // ------------------------------------------------------------------ | |
442 // ciEnv::get_klass_by_index_impl | |
443 // | |
444 // Implementation of get_klass_by_index. | |
445 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor, | |
446 int index, | |
447 bool& is_accessible) { | |
448 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); | |
449 EXCEPTION_CONTEXT; | |
450 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants()); | |
451 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); | |
452 symbolHandle klass_name; | |
453 if (klass.is_null()) { | |
454 // The klass has not been inserted into the constant pool. | |
455 // Try to look it up by name. | |
456 { | |
457 // We have to lock the cpool to keep the oop from being resolved | |
458 // while we are accessing it. | |
459 ObjectLocker ol(cpool, THREAD); | |
460 | |
461 constantTag tag = cpool->tag_at(index); | |
462 if (tag.is_klass()) { | |
463 // The klass has been inserted into the constant pool | |
464 // very recently. | |
465 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); | |
466 } else if (tag.is_symbol()) { | |
467 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); | |
468 } else { | |
469 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); | |
470 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); | |
471 } | |
472 } | |
473 } | |
474 | |
475 if (klass.is_null()) { | |
476 // Not found in constant pool. Use the name to do the lookup. | |
477 ciKlass* k = get_klass_by_name_impl(accessor, | |
478 get_object(klass_name())->as_symbol(), | |
479 false); | |
480 // Calculate accessibility the hard way. | |
481 if (!k->is_loaded()) { | |
482 is_accessible = false; | |
483 } else if (k->loader() != accessor->loader() && | |
484 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { | |
485 // Loaded only remotely. Not linked yet. | |
486 is_accessible = false; | |
487 } else { | |
488 // Linked locally, and we must also check public/private, etc. | |
489 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); | |
490 } | |
491 return k; | |
492 } | |
493 | |
494 // Check for prior unloaded klass. The SystemDictionary's answers | |
495 // can vary over time but the compiler needs consistency. | |
496 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); | |
497 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); | |
498 if (unloaded_klass != NULL) { | |
499 is_accessible = false; | |
500 return unloaded_klass; | |
501 } | |
502 | |
503 // It is known to be accessible, since it was found in the constant pool. | |
504 is_accessible = true; | |
505 return get_object(klass())->as_klass(); | |
506 } | |
507 | |
508 // ------------------------------------------------------------------ | |
509 // ciEnv::get_klass_by_index | |
510 // | |
511 // Get a klass from the constant pool. | |
512 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor, | |
513 int index, | |
514 bool& is_accessible) { | |
515 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);) | |
516 } | |
517 | |
518 // ------------------------------------------------------------------ | |
519 // ciEnv::get_constant_by_index_impl | |
520 // | |
521 // Implementation of get_constant_by_index(). | |
522 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor, | |
523 int index) { | |
524 EXCEPTION_CONTEXT; | |
525 instanceKlass* ik_accessor = accessor->get_instanceKlass(); | |
526 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool"); | |
527 constantPoolOop cpool = ik_accessor->constants(); | |
528 constantTag tag = cpool->tag_at(index); | |
529 if (tag.is_int()) { | |
530 return ciConstant(T_INT, (jint)cpool->int_at(index)); | |
531 } else if (tag.is_long()) { | |
532 return ciConstant((jlong)cpool->long_at(index)); | |
533 } else if (tag.is_float()) { | |
534 return ciConstant((jfloat)cpool->float_at(index)); | |
535 } else if (tag.is_double()) { | |
536 return ciConstant((jdouble)cpool->double_at(index)); | |
537 } else if (tag.is_string() || tag.is_unresolved_string()) { | |
431
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538 oop string = NULL; |
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539 if (cpool->is_pseudo_string_at(index)) { |
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540 string = cpool->pseudo_string_at(index); |
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541 } else { |
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542 string = cpool->string_at(index, THREAD); |
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543 if (HAS_PENDING_EXCEPTION) { |
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544 CLEAR_PENDING_EXCEPTION; |
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545 record_out_of_memory_failure(); |
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546 return ciConstant(); |
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547 } |
0 | 548 } |
549 ciObject* constant = get_object(string); | |
550 assert (constant->is_instance(), "must be an instance, or not? "); | |
551 return ciConstant(T_OBJECT, constant); | |
552 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
553 // 4881222: allow ldc to take a class type | |
554 bool ignore; | |
555 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore); | |
556 if (HAS_PENDING_EXCEPTION) { | |
557 CLEAR_PENDING_EXCEPTION; | |
558 record_out_of_memory_failure(); | |
559 return ciConstant(); | |
560 } | |
561 assert (klass->is_instance_klass() || klass->is_array_klass(), | |
562 "must be an instance or array klass "); | |
563 return ciConstant(T_OBJECT, klass); | |
564 } else { | |
565 ShouldNotReachHere(); | |
566 return ciConstant(); | |
567 } | |
568 } | |
569 | |
570 // ------------------------------------------------------------------ | |
571 // ciEnv::is_unresolved_string_impl | |
572 // | |
573 // Implementation of is_unresolved_string(). | |
574 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { | |
575 EXCEPTION_CONTEXT; | |
576 assert(accessor->is_linked(), "must be linked before accessing constant pool"); | |
577 constantPoolOop cpool = accessor->constants(); | |
578 constantTag tag = cpool->tag_at(index); | |
579 return tag.is_unresolved_string(); | |
580 } | |
581 | |
582 // ------------------------------------------------------------------ | |
583 // ciEnv::is_unresolved_klass_impl | |
584 // | |
585 // Implementation of is_unresolved_klass(). | |
586 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { | |
587 EXCEPTION_CONTEXT; | |
588 assert(accessor->is_linked(), "must be linked before accessing constant pool"); | |
589 constantPoolOop cpool = accessor->constants(); | |
590 constantTag tag = cpool->tag_at(index); | |
591 return tag.is_unresolved_klass(); | |
592 } | |
593 | |
594 // ------------------------------------------------------------------ | |
595 // ciEnv::get_constant_by_index | |
596 // | |
597 // Pull a constant out of the constant pool. How appropriate. | |
598 // | |
599 // Implementation note: this query is currently in no way cached. | |
600 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor, | |
601 int index) { | |
602 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); ) | |
603 } | |
604 | |
605 // ------------------------------------------------------------------ | |
606 // ciEnv::is_unresolved_string | |
607 // | |
608 // Check constant pool | |
609 // | |
610 // Implementation note: this query is currently in no way cached. | |
611 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, | |
612 int index) const { | |
613 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) | |
614 } | |
615 | |
616 // ------------------------------------------------------------------ | |
617 // ciEnv::is_unresolved_klass | |
618 // | |
619 // Check constant pool | |
620 // | |
621 // Implementation note: this query is currently in no way cached. | |
622 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, | |
623 int index) const { | |
624 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) | |
625 } | |
626 | |
627 // ------------------------------------------------------------------ | |
628 // ciEnv::get_field_by_index_impl | |
629 // | |
630 // Implementation of get_field_by_index. | |
631 // | |
632 // Implementation note: the results of field lookups are cached | |
633 // in the accessor klass. | |
634 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, | |
635 int index) { | |
636 ciConstantPoolCache* cache = accessor->field_cache(); | |
637 if (cache == NULL) { | |
638 ciField* field = new (arena()) ciField(accessor, index); | |
639 return field; | |
640 } else { | |
641 ciField* field = (ciField*)cache->get(index); | |
642 if (field == NULL) { | |
643 field = new (arena()) ciField(accessor, index); | |
644 cache->insert(index, field); | |
645 } | |
646 return field; | |
647 } | |
648 } | |
649 | |
650 // ------------------------------------------------------------------ | |
651 // ciEnv::get_field_by_index | |
652 // | |
653 // Get a field by index from a klass's constant pool. | |
654 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, | |
655 int index) { | |
656 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) | |
657 } | |
658 | |
659 // ------------------------------------------------------------------ | |
660 // ciEnv::lookup_method | |
661 // | |
662 // Perform an appropriate method lookup based on accessor, holder, | |
663 // name, signature, and bytecode. | |
664 methodOop ciEnv::lookup_method(instanceKlass* accessor, | |
665 instanceKlass* holder, | |
666 symbolOop name, | |
667 symbolOop sig, | |
668 Bytecodes::Code bc) { | |
669 EXCEPTION_CONTEXT; | |
670 KlassHandle h_accessor(THREAD, accessor); | |
671 KlassHandle h_holder(THREAD, holder); | |
672 symbolHandle h_name(THREAD, name); | |
673 symbolHandle h_sig(THREAD, sig); | |
674 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); | |
675 methodHandle dest_method; | |
676 switch (bc) { | |
677 case Bytecodes::_invokestatic: | |
678 dest_method = | |
679 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); | |
680 break; | |
681 case Bytecodes::_invokespecial: | |
682 dest_method = | |
683 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); | |
684 break; | |
685 case Bytecodes::_invokeinterface: | |
686 dest_method = | |
687 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, | |
688 h_accessor, true); | |
689 break; | |
690 case Bytecodes::_invokevirtual: | |
691 dest_method = | |
692 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, | |
693 h_accessor, true); | |
694 break; | |
695 default: ShouldNotReachHere(); | |
696 } | |
697 | |
698 return dest_method(); | |
699 } | |
700 | |
701 | |
702 // ------------------------------------------------------------------ | |
703 // ciEnv::get_method_by_index_impl | |
704 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor, | |
705 int index, Bytecodes::Code bc) { | |
706 // Get the method's declared holder. | |
707 | |
708 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); | |
709 constantPoolHandle cpool = accessor->get_instanceKlass()->constants(); | |
710 int holder_index = cpool->klass_ref_index_at(index); | |
711 bool holder_is_accessible; | |
712 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible); | |
713 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); | |
714 | |
715 // Get the method's name and signature. | |
716 symbolOop name_sym = cpool->name_ref_at(index); | |
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717 symbolOop sig_sym = cpool->signature_ref_at(index); |
0 | 718 |
719 if (holder_is_accessible) { // Our declared holder is loaded. | |
720 instanceKlass* lookup = declared_holder->get_instanceKlass(); | |
721 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); | |
722 if (m != NULL) { | |
723 // We found the method. | |
724 return get_object(m)->as_method(); | |
725 } | |
726 } | |
727 | |
728 // Either the declared holder was not loaded, or the method could | |
729 // not be found. Create a dummy ciMethod to represent the failed | |
730 // lookup. | |
731 | |
732 return get_unloaded_method(declared_holder, | |
733 get_object(name_sym)->as_symbol(), | |
734 get_object(sig_sym)->as_symbol()); | |
735 } | |
736 | |
737 | |
738 // ------------------------------------------------------------------ | |
739 // ciEnv::get_instance_klass_for_declared_method_holder | |
740 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { | |
741 // For the case of <array>.clone(), the method holder can be a ciArrayKlass | |
742 // instead of a ciInstanceKlass. For that case simply pretend that the | |
743 // declared holder is Object.clone since that's where the call will bottom out. | |
744 // A more correct fix would trickle out through many interfaces in CI, | |
745 // requiring ciInstanceKlass* to become ciKlass* and many more places would | |
746 // require checks to make sure the expected type was found. Given that this | |
747 // only occurs for clone() the more extensive fix seems like overkill so | |
748 // instead we simply smear the array type into Object. | |
749 if (method_holder->is_instance_klass()) { | |
750 return method_holder->as_instance_klass(); | |
751 } else if (method_holder->is_array_klass()) { | |
752 return current()->Object_klass(); | |
753 } else { | |
754 ShouldNotReachHere(); | |
755 } | |
756 return NULL; | |
757 } | |
758 | |
759 | |
760 | |
761 | |
762 // ------------------------------------------------------------------ | |
763 // ciEnv::get_method_by_index | |
764 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor, | |
765 int index, Bytecodes::Code bc) { | |
766 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);) | |
767 } | |
768 | |
769 // ------------------------------------------------------------------ | |
770 // ciEnv::name_buffer | |
771 char *ciEnv::name_buffer(int req_len) { | |
772 if (_name_buffer_len < req_len) { | |
773 if (_name_buffer == NULL) { | |
774 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); | |
775 _name_buffer_len = req_len; | |
776 } else { | |
777 _name_buffer = | |
778 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); | |
779 _name_buffer_len = req_len; | |
780 } | |
781 } | |
782 return _name_buffer; | |
783 } | |
784 | |
785 // ------------------------------------------------------------------ | |
786 // ciEnv::is_in_vm | |
787 bool ciEnv::is_in_vm() { | |
788 return JavaThread::current()->thread_state() == _thread_in_vm; | |
789 } | |
790 | |
791 bool ciEnv::system_dictionary_modification_counter_changed() { | |
792 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); | |
793 } | |
794 | |
795 // ------------------------------------------------------------------ | |
796 // ciEnv::check_for_system_dictionary_modification | |
797 // Check for changes to the system dictionary during compilation | |
798 // class loads, evolution, breakpoints | |
799 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { | |
800 if (failing()) return; // no need for further checks | |
801 | |
802 // Dependencies must be checked when the system dictionary changes. | |
803 // If logging is enabled all violated dependences will be recorded in | |
804 // the log. In debug mode check dependencies even if the system | |
805 // dictionary hasn't changed to verify that no invalid dependencies | |
806 // were inserted. Any violated dependences in this case are dumped to | |
807 // the tty. | |
808 | |
809 bool counter_changed = system_dictionary_modification_counter_changed(); | |
810 bool test_deps = counter_changed; | |
811 DEBUG_ONLY(test_deps = true); | |
812 if (!test_deps) return; | |
813 | |
814 bool print_failures = false; | |
815 DEBUG_ONLY(print_failures = !counter_changed); | |
816 | |
817 bool keep_going = (print_failures || xtty != NULL); | |
818 | |
819 int violated = 0; | |
820 | |
821 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { | |
822 klassOop witness = deps.check_dependency(); | |
823 if (witness != NULL) { | |
824 ++violated; | |
825 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); | |
826 // If there's no log and we're not sanity-checking, we're done. | |
827 if (!keep_going) break; | |
828 } | |
829 } | |
830 | |
831 if (violated != 0) { | |
832 assert(counter_changed, "failed dependencies, but counter didn't change"); | |
833 record_failure("concurrent class loading"); | |
834 } | |
835 } | |
836 | |
837 // ------------------------------------------------------------------ | |
838 // ciEnv::register_method | |
839 void ciEnv::register_method(ciMethod* target, | |
840 int entry_bci, | |
841 CodeOffsets* offsets, | |
842 int orig_pc_offset, | |
843 CodeBuffer* code_buffer, | |
844 int frame_words, | |
845 OopMapSet* oop_map_set, | |
846 ExceptionHandlerTable* handler_table, | |
847 ImplicitExceptionTable* inc_table, | |
848 AbstractCompiler* compiler, | |
849 int comp_level, | |
850 bool has_debug_info, | |
851 bool has_unsafe_access) { | |
852 VM_ENTRY_MARK; | |
853 nmethod* nm = NULL; | |
854 { | |
855 // To prevent compile queue updates. | |
856 MutexLocker locker(MethodCompileQueue_lock, THREAD); | |
857 | |
858 // Prevent SystemDictionary::add_to_hierarchy from running | |
859 // and invalidating our dependencies until we install this method. | |
860 MutexLocker ml(Compile_lock); | |
861 | |
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862 // Change in Jvmti state may invalidate compilation. |
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863 if (!failing() && |
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864 ( (!jvmti_can_hotswap_or_post_breakpoint() && |
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865 JvmtiExport::can_hotswap_or_post_breakpoint()) || |
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866 (!jvmti_can_examine_or_deopt_anywhere() && |
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867 JvmtiExport::can_examine_or_deopt_anywhere()) || |
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868 (!jvmti_can_access_local_variables() && |
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869 JvmtiExport::can_access_local_variables()) || |
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870 (!jvmti_can_post_exceptions() && |
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871 JvmtiExport::can_post_exceptions()) )) { |
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872 record_failure("Jvmti state change invalidated dependencies"); |
0 | 873 } |
874 | |
780
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875 // Change in DTrace flags may invalidate compilation. |
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876 if (!failing() && |
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877 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || |
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878 (!dtrace_method_probes() && DTraceMethodProbes) || |
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879 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { |
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880 record_failure("DTrace flags change invalidated dependencies"); |
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881 } |
0 | 882 |
780
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883 if (!failing()) { |
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884 if (log() != NULL) { |
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885 // Log the dependencies which this compilation declares. |
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886 dependencies()->log_all_dependencies(); |
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887 } |
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888 |
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889 // Encode the dependencies now, so we can check them right away. |
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890 dependencies()->encode_content_bytes(); |
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891 |
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892 // Check for {class loads, evolution, breakpoints} during compilation |
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893 check_for_system_dictionary_modification(target); |
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894 } |
0 | 895 |
896 methodHandle method(THREAD, target->get_methodOop()); | |
897 | |
898 if (failing()) { | |
899 // While not a true deoptimization, it is a preemptive decompile. | |
900 methodDataOop mdo = method()->method_data(); | |
901 if (mdo != NULL) { | |
902 mdo->inc_decompile_count(); | |
903 } | |
904 | |
905 // All buffers in the CodeBuffer are allocated in the CodeCache. | |
906 // If the code buffer is created on each compile attempt | |
907 // as in C2, then it must be freed. | |
908 code_buffer->free_blob(); | |
909 return; | |
910 } | |
911 | |
912 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); | |
913 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); | |
914 | |
915 nm = nmethod::new_nmethod(method, | |
916 compile_id(), | |
917 entry_bci, | |
918 offsets, | |
919 orig_pc_offset, | |
920 debug_info(), dependencies(), code_buffer, | |
921 frame_words, oop_map_set, | |
922 handler_table, inc_table, | |
923 compiler, comp_level); | |
924 | |
925 // Free codeBlobs | |
926 code_buffer->free_blob(); | |
927 | |
928 // stress test 6243940 by immediately making the method | |
929 // non-entrant behind the system's back. This has serious | |
930 // side effects on the code cache and is not meant for | |
931 // general stress testing | |
932 if (nm != NULL && StressNonEntrant) { | |
933 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
934 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), | |
935 SharedRuntime::get_handle_wrong_method_stub()); | |
936 } | |
937 | |
938 if (nm == NULL) { | |
939 // The CodeCache is full. Print out warning and disable compilation. | |
940 record_failure("code cache is full"); | |
941 UseInterpreter = true; | |
942 if (UseCompiler || AlwaysCompileLoopMethods ) { | |
943 #ifndef PRODUCT | |
944 warning("CodeCache is full. Compiler has been disabled"); | |
945 if (CompileTheWorld || ExitOnFullCodeCache) { | |
946 before_exit(JavaThread::current()); | |
947 exit_globals(); // will delete tty | |
948 vm_direct_exit(CompileTheWorld ? 0 : 1); | |
949 } | |
950 #endif | |
951 UseCompiler = false; | |
952 AlwaysCompileLoopMethods = false; | |
953 } | |
954 } else { | |
955 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) | |
956 nm->set_has_unsafe_access(has_unsafe_access); | |
957 | |
958 // Record successful registration. | |
959 // (Put nm into the task handle *before* publishing to the Java heap.) | |
960 if (task() != NULL) task()->set_code(nm); | |
961 | |
962 if (entry_bci == InvocationEntryBci) { | |
963 #ifdef TIERED | |
964 // If there is an old version we're done with it | |
965 nmethod* old = method->code(); | |
966 if (TraceMethodReplacement && old != NULL) { | |
967 ResourceMark rm; | |
968 char *method_name = method->name_and_sig_as_C_string(); | |
969 tty->print_cr("Replacing method %s", method_name); | |
970 } | |
971 if (old != NULL ) { | |
972 old->make_not_entrant(); | |
973 } | |
974 #endif // TIERED | |
975 if (TraceNMethodInstalls ) { | |
976 ResourceMark rm; | |
977 char *method_name = method->name_and_sig_as_C_string(); | |
978 ttyLocker ttyl; | |
979 tty->print_cr("Installing method (%d) %s ", | |
980 comp_level, | |
981 method_name); | |
982 } | |
983 // Allow the code to be executed | |
984 method->set_code(method, nm); | |
985 } else { | |
986 if (TraceNMethodInstalls ) { | |
987 ResourceMark rm; | |
988 char *method_name = method->name_and_sig_as_C_string(); | |
989 ttyLocker ttyl; | |
990 tty->print_cr("Installing osr method (%d) %s @ %d", | |
991 comp_level, | |
992 method_name, | |
993 entry_bci); | |
994 } | |
995 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); | |
996 | |
997 } | |
998 } | |
999 } | |
1000 // JVMTI -- compiled method notification (must be done outside lock) | |
1001 if (nm != NULL) { | |
1002 nm->post_compiled_method_load_event(); | |
1003 } | |
1004 | |
1005 } | |
1006 | |
1007 | |
1008 // ------------------------------------------------------------------ | |
1009 // ciEnv::find_system_klass | |
1010 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { | |
1011 VM_ENTRY_MARK; | |
1012 return get_klass_by_name_impl(NULL, klass_name, false); | |
1013 } | |
1014 | |
1015 // ------------------------------------------------------------------ | |
1016 // ciEnv::comp_level | |
1017 int ciEnv::comp_level() { | |
1018 if (task() == NULL) return CompLevel_full_optimization; | |
1019 return task()->comp_level(); | |
1020 } | |
1021 | |
1022 // ------------------------------------------------------------------ | |
1023 // ciEnv::compile_id | |
1024 uint ciEnv::compile_id() { | |
1025 if (task() == NULL) return 0; | |
1026 return task()->compile_id(); | |
1027 } | |
1028 | |
1029 // ------------------------------------------------------------------ | |
1030 // ciEnv::notice_inlined_method() | |
1031 void ciEnv::notice_inlined_method(ciMethod* method) { | |
1032 _num_inlined_bytecodes += method->code_size(); | |
1033 } | |
1034 | |
1035 // ------------------------------------------------------------------ | |
1036 // ciEnv::num_inlined_bytecodes() | |
1037 int ciEnv::num_inlined_bytecodes() const { | |
1038 return _num_inlined_bytecodes; | |
1039 } | |
1040 | |
1041 // ------------------------------------------------------------------ | |
1042 // ciEnv::record_failure() | |
1043 void ciEnv::record_failure(const char* reason) { | |
1044 if (log() != NULL) { | |
1045 log()->elem("failure reason='%s'", reason); | |
1046 } | |
1047 if (_failure_reason == NULL) { | |
1048 // Record the first failure reason. | |
1049 _failure_reason = reason; | |
1050 } | |
1051 } | |
1052 | |
1053 // ------------------------------------------------------------------ | |
1054 // ciEnv::record_method_not_compilable() | |
1055 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { | |
1056 int new_compilable = | |
1057 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; | |
1058 | |
1059 // Only note transitions to a worse state | |
1060 if (new_compilable > _compilable) { | |
1061 if (log() != NULL) { | |
1062 if (all_tiers) { | |
1063 log()->elem("method_not_compilable"); | |
1064 } else { | |
1065 log()->elem("method_not_compilable_at_tier"); | |
1066 } | |
1067 } | |
1068 _compilable = new_compilable; | |
1069 | |
1070 // Reset failure reason; this one is more important. | |
1071 _failure_reason = NULL; | |
1072 record_failure(reason); | |
1073 } | |
1074 } | |
1075 | |
1076 // ------------------------------------------------------------------ | |
1077 // ciEnv::record_out_of_memory_failure() | |
1078 void ciEnv::record_out_of_memory_failure() { | |
1079 // If memory is low, we stop compiling methods. | |
1080 record_method_not_compilable("out of memory"); | |
1081 } |