1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CI_CIENV_HPP
26 #define SHARE_VM_CI_CIENV_HPP
27
28 #include "ci/ciClassList.hpp"
29 #include "ci/ciObjectFactory.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "code/debugInfoRec.hpp"
32 #include "code/dependencies.hpp"
33 #include "code/exceptionHandlerTable.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "runtime/thread.hpp"
36
37 class CompileTask;
38
39 // ciEnv
40 //
41 // This class is the top level broker for requests from the compiler
42 // to the VM.
43 class ciEnv : StackObj {
44 CI_PACKAGE_ACCESS_TO
45
46 friend class CompileBroker;
47 friend class Dependencies; // for get_object, during logging
48
49 private:
50 Arena* _arena; // Alias for _ciEnv_arena except in init_shared_objects()
51 Arena _ciEnv_arena;
52 int _system_dictionary_modification_counter;
53 ciObjectFactory* _factory;
54 OopRecorder* _oop_recorder;
55 DebugInformationRecorder* _debug_info;
56 Dependencies* _dependencies;
57 const char* _failure_reason;
58 int _compilable;
59 bool _break_at_compile;
60 int _num_inlined_bytecodes;
61 CompileTask* _task; // faster access to CompilerThread::task
62 CompileLog* _log; // faster access to CompilerThread::log
63 void* _compiler_data; // compiler-specific stuff, if any
64
65 char* _name_buffer;
66 int _name_buffer_len;
67
68 // Cache Jvmti state
69 bool _jvmti_can_hotswap_or_post_breakpoint;
70 bool _jvmti_can_access_local_variables;
71 bool _jvmti_can_post_on_exceptions;
72 bool _jvmti_can_pop_frame;
73
74 // Cache DTrace flags
75 bool _dtrace_extended_probes;
76 bool _dtrace_monitor_probes;
77 bool _dtrace_method_probes;
78 bool _dtrace_alloc_probes;
79
80 // Distinguished instances of certain ciObjects..
81 static ciObject* _null_object_instance;
82
83 #define WK_KLASS_DECL(name, ignore_s, ignore_o) static ciInstanceKlass* _##name;
84 WK_KLASSES_DO(WK_KLASS_DECL)
85 #undef WK_KLASS_DECL
86
87 static ciSymbol* _unloaded_cisymbol;
88 static ciInstanceKlass* _unloaded_ciinstance_klass;
89 static ciObjArrayKlass* _unloaded_ciobjarrayklass;
90
91 static jobject _ArrayIndexOutOfBoundsException_handle;
92 static jobject _ArrayStoreException_handle;
93 static jobject _ClassCastException_handle;
94
95 ciInstance* _NullPointerException_instance;
96 ciInstance* _ArithmeticException_instance;
97 ciInstance* _ArrayIndexOutOfBoundsException_instance;
98 ciInstance* _ArrayStoreException_instance;
99 ciInstance* _ClassCastException_instance;
100
101 ciInstance* _the_null_string; // The Java string "null"
102 ciInstance* _the_min_jint_string; // The Java string "-2147483648"
103
104 // Look up a klass by name from a particular class loader (the accessor's).
105 // If require_local, result must be defined in that class loader, or NULL.
106 // If !require_local, a result from remote class loader may be reported,
107 // if sufficient class loader constraints exist such that initiating
108 // a class loading request from the given loader is bound to return
109 // the class defined in the remote loader (or throw an error).
110 //
111 // Return an unloaded klass if !require_local and no class at all is found.
112 //
113 // The CI treats a klass as loaded if it is consistently defined in
114 // another loader, even if it hasn't yet been loaded in all loaders
115 // that could potentially see it via delegation.
116 ciKlass* get_klass_by_name(ciKlass* accessing_klass,
117 ciSymbol* klass_name,
118 bool require_local);
119
120 // Constant pool access.
121 ciKlass* get_klass_by_index(const constantPoolHandle& cpool,
122 int klass_index,
123 bool& is_accessible,
124 ciInstanceKlass* loading_klass);
125 ciConstant get_constant_by_index(const constantPoolHandle& cpool,
126 int pool_index, int cache_index,
127 ciInstanceKlass* accessor);
128 ciField* get_field_by_index(ciInstanceKlass* loading_klass,
129 int field_index);
130 ciMethod* get_method_by_index(const constantPoolHandle& cpool,
131 int method_index, Bytecodes::Code bc,
132 ciInstanceKlass* loading_klass);
133
134 // Implementation methods for loading and constant pool access.
135 ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass,
136 const constantPoolHandle& cpool,
137 ciSymbol* klass_name,
138 bool require_local);
139 ciKlass* get_klass_by_index_impl(const constantPoolHandle& cpool,
140 int klass_index,
141 bool& is_accessible,
142 ciInstanceKlass* loading_klass);
143 ciConstant get_constant_by_index_impl(const constantPoolHandle& cpool,
144 int pool_index, int cache_index,
145 ciInstanceKlass* loading_klass);
146 ciField* get_field_by_index_impl(ciInstanceKlass* loading_klass,
147 int field_index);
148 ciMethod* get_method_by_index_impl(const constantPoolHandle& cpool,
149 int method_index, Bytecodes::Code bc,
150 ciInstanceKlass* loading_klass);
151
152 // Helper methods
153 bool check_klass_accessibility(ciKlass* accessing_klass,
154 Klass* resolved_klass);
155 Method* lookup_method(InstanceKlass* accessor,
156 InstanceKlass* holder,
157 Symbol* name,
158 Symbol* sig,
159 Bytecodes::Code bc,
160 constantTag tag);
161
162 // Get a ciObject from the object factory. Ensures uniqueness
163 // of ciObjects.
164 ciObject* get_object(oop o) {
165 if (o == NULL) {
166 return _null_object_instance;
167 } else {
168 return _factory->get(o);
169 }
170 }
171
172 ciSymbol* get_symbol(Symbol* o) {
173 if (o == NULL) {
174 ShouldNotReachHere();
175 return NULL;
176 } else {
177 return _factory->get_symbol(o);
178 }
179 }
180
181 ciMetadata* get_metadata(Metadata* o) {
182 if (o == NULL) {
183 return NULL;
184 } else {
185 return _factory->get_metadata(o);
186 }
187 }
188
189 void ensure_metadata_alive(ciMetadata* m) {
190 _factory->ensure_metadata_alive(m);
191 }
192
193 ciInstance* get_instance(oop o) {
194 if (o == NULL) return NULL;
195 return get_object(o)->as_instance();
196 }
197 ciObjArrayKlass* get_obj_array_klass(Klass* o) {
198 if (o == NULL) return NULL;
199 return get_metadata(o)->as_obj_array_klass();
200 }
201 ciTypeArrayKlass* get_type_array_klass(Klass* o) {
202 if (o == NULL) return NULL;
203 return get_metadata(o)->as_type_array_klass();
204 }
205 ciKlass* get_klass(Klass* o) {
206 if (o == NULL) return NULL;
207 return get_metadata(o)->as_klass();
208 }
209 ciInstanceKlass* get_instance_klass(Klass* o) {
210 if (o == NULL) return NULL;
211 return get_metadata(o)->as_instance_klass();
212 }
213 ciMethod* get_method(Method* o) {
214 if (o == NULL) return NULL;
215 return get_metadata(o)->as_method();
216 }
217 ciMethodData* get_method_data(MethodData* o) {
218 if (o == NULL) return NULL;
219 return get_metadata(o)->as_method_data();
220 }
221
222 ciMethod* get_method_from_handle(Method* method);
223
224 ciInstance* get_or_create_exception(jobject& handle, Symbol* name);
225
226 // Get a ciMethod representing either an unfound method or
227 // a method with an unloaded holder. Ensures uniqueness of
228 // the result.
229 ciMethod* get_unloaded_method(ciInstanceKlass* holder,
230 ciSymbol* name,
231 ciSymbol* signature,
232 ciInstanceKlass* accessor) {
233 return _factory->get_unloaded_method(holder, name, signature, accessor);
234 }
235
236 // Get a ciKlass representing an unloaded klass.
237 // Ensures uniqueness of the result.
238 ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
239 ciSymbol* name) {
240 return _factory->get_unloaded_klass(accessing_klass, name, true);
241 }
242
243 // Get a ciKlass representing an unloaded klass mirror.
244 // Result is not necessarily unique, but will be unloaded.
245 ciInstance* get_unloaded_klass_mirror(ciKlass* type) {
246 return _factory->get_unloaded_klass_mirror(type);
247 }
248
249 // Get a ciInstance representing an unresolved method handle constant.
250 ciInstance* get_unloaded_method_handle_constant(ciKlass* holder,
251 ciSymbol* name,
252 ciSymbol* signature,
253 int ref_kind) {
254 return _factory->get_unloaded_method_handle_constant(holder, name, signature, ref_kind);
255 }
256
257 // Get a ciInstance representing an unresolved method type constant.
258 ciInstance* get_unloaded_method_type_constant(ciSymbol* signature) {
259 return _factory->get_unloaded_method_type_constant(signature);
260 }
261
262 // See if we already have an unloaded klass for the given name
263 // or return NULL if not.
264 ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) {
265 return _factory->get_unloaded_klass(accessing_klass, name, false);
266 }
267
268 // Get a ciReturnAddress corresponding to the given bci.
269 // Ensures uniqueness of the result.
270 ciReturnAddress* get_return_address(int bci) {
271 return _factory->get_return_address(bci);
272 }
273
274 // Get a ciMethodData representing the methodData for a method
275 // with none.
276 ciMethodData* get_empty_methodData() {
277 return _factory->get_empty_methodData();
278 }
279
280 // General utility : get a buffer of some required length.
281 // Used in symbol creation.
282 char* name_buffer(int req_len);
283
284 // Is this thread currently in the VM state?
285 static bool is_in_vm();
286
287 // Helper routine for determining the validity of a compilation with
288 // respect to method dependencies (e.g. concurrent class loading).
289 void validate_compile_task_dependencies(ciMethod* target);
290
291 public:
292 enum {
293 MethodCompilable,
294 MethodCompilable_not_at_tier,
295 MethodCompilable_never
296 };
297
298 ciEnv(CompileTask* task, int system_dictionary_modification_counter);
299 // Used only during initialization of the ci
300 ciEnv(Arena* arena);
301 ~ciEnv();
302
303 OopRecorder* oop_recorder() { return _oop_recorder; }
304 void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; }
305
306 DebugInformationRecorder* debug_info() { return _debug_info; }
307 void set_debug_info(DebugInformationRecorder* i) { _debug_info = i; }
308
309 Dependencies* dependencies() { return _dependencies; }
310 void set_dependencies(Dependencies* d) { _dependencies = d; }
311
312 // This is true if the compilation is not going to produce code.
313 // (It is reasonable to retry failed compilations.)
314 bool failing() { return _failure_reason != NULL; }
315
316 // Reason this compilation is failing, such as "too many basic blocks".
317 const char* failure_reason() { return _failure_reason; }
318
319 // Return state of appropriate compilability
320 int compilable() { return _compilable; }
321
322 const char* retry_message() const {
323 switch (_compilable) {
324 case ciEnv::MethodCompilable_not_at_tier:
325 return "retry at different tier";
326 case ciEnv::MethodCompilable_never:
327 return "not retryable";
328 case ciEnv::MethodCompilable:
329 return NULL;
330 default:
331 ShouldNotReachHere();
332 return NULL;
333 }
334 }
335
336 bool break_at_compile() { return _break_at_compile; }
337 void set_break_at_compile(bool z) { _break_at_compile = z; }
338
339 // Cache Jvmti state
340 void cache_jvmti_state();
341 bool jvmti_state_changed() const;
342 bool should_retain_local_variables() const;
343 bool jvmti_can_hotswap_or_post_breakpoint() const { return _jvmti_can_hotswap_or_post_breakpoint; }
344 bool jvmti_can_post_on_exceptions() const { return _jvmti_can_post_on_exceptions; }
345
346 // Cache DTrace flags
347 void cache_dtrace_flags();
348 bool dtrace_extended_probes() const { return _dtrace_extended_probes; }
349 bool dtrace_monitor_probes() const { return _dtrace_monitor_probes; }
350 bool dtrace_method_probes() const { return _dtrace_method_probes; }
351 bool dtrace_alloc_probes() const { return _dtrace_alloc_probes; }
352
353 // The compiler task which has created this env.
354 // May be useful to find out compile_id, comp_level, etc.
355 CompileTask* task() { return _task; }
356 // Handy forwards to the task:
357 int comp_level(); // task()->comp_level()
358 uint compile_id(); // task()->compile_id()
359
360 // Register the result of a compilation.
361 void register_method(ciMethod* target,
362 int entry_bci,
363 CodeOffsets* offsets,
364 int orig_pc_offset,
365 CodeBuffer* code_buffer,
366 int frame_words,
367 OopMapSet* oop_map_set,
368 ExceptionHandlerTable* handler_table,
369 ImplicitExceptionTable* inc_table,
370 AbstractCompiler* compiler,
371 int comp_level,
372 bool has_unsafe_access,
373 bool has_wide_vectors,
374 RTMState rtm_state = NoRTM);
375
376
377 // Access to certain well known ciObjects.
378 #define WK_KLASS_FUNC(name, ignore_s, ignore_o) \
379 ciInstanceKlass* name() { \
380 return _##name;\
381 }
382 WK_KLASSES_DO(WK_KLASS_FUNC)
383 #undef WK_KLASS_FUNC
384
385 ciInstance* NullPointerException_instance() {
386 assert(_NullPointerException_instance != NULL, "initialization problem");
387 return _NullPointerException_instance;
388 }
389 ciInstance* ArithmeticException_instance() {
390 assert(_ArithmeticException_instance != NULL, "initialization problem");
391 return _ArithmeticException_instance;
392 }
393
394 // Lazy constructors:
395 ciInstance* ArrayIndexOutOfBoundsException_instance();
396 ciInstance* ArrayStoreException_instance();
397 ciInstance* ClassCastException_instance();
398
399 ciInstance* the_null_string();
400 ciInstance* the_min_jint_string();
401
402 static ciSymbol* unloaded_cisymbol() {
403 return _unloaded_cisymbol;
404 }
405 static ciObjArrayKlass* unloaded_ciobjarrayklass() {
406 return _unloaded_ciobjarrayklass;
407 }
408 static ciInstanceKlass* unloaded_ciinstance_klass() {
409 return _unloaded_ciinstance_klass;
410 }
411 ciInstance* unloaded_ciinstance();
412
413 ciKlass* find_system_klass(ciSymbol* klass_name);
414 // Note: To find a class from its name string, use ciSymbol::make,
415 // but consider adding to vmSymbols.hpp instead.
416
417 // converts the ciKlass* representing the holder of a method into a
418 // ciInstanceKlass*. This is needed since the holder of a method in
419 // the bytecodes could be an array type. Basically this converts
420 // array types into java/lang/Object and other types stay as they are.
421 static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass);
422
423 // Return the machine-level offset of o, which must be an element of a.
424 // This may be used to form constant-loading expressions in lieu of simpler encodings.
425 int array_element_offset_in_bytes(ciArray* a, ciObject* o);
426
427 // Access to the compile-lifetime allocation arena.
428 Arena* arena() { return _arena; }
429
430 // What is the current compilation environment?
431 static ciEnv* current() { return CompilerThread::current()->env(); }
432
433 // Overload with current thread argument
434 static ciEnv* current(CompilerThread *thread) { return thread->env(); }
435
436 // Per-compiler data. (Used by C2 to publish the Compile* pointer.)
437 void* compiler_data() { return _compiler_data; }
438 void set_compiler_data(void* x) { _compiler_data = x; }
439
440 // Notice that a method has been inlined in the current compile;
441 // used only for statistics.
442 void notice_inlined_method(ciMethod* method);
443
444 // Total number of bytecodes in inlined methods in this compile
445 int num_inlined_bytecodes() const;
446
447 // Output stream for logging compilation info.
448 CompileLog* log() { return _log; }
449 void set_log(CompileLog* log) { _log = log; }
450
451 // Check for changes to the system dictionary during compilation
452 bool system_dictionary_modification_counter_changed();
453
454 void record_failure(const char* reason); // Record failure and report later
455 void report_failure(const char* reason); // Report failure immediately
456 void record_method_not_compilable(const char* reason, bool all_tiers = true);
457 void record_out_of_memory_failure();
458
459 // RedefineClasses support
460 void metadata_do(void f(Metadata*)) { _factory->metadata_do(f); }
461
462 // Dump the compilation replay data for the ciEnv to the stream.
463 void dump_replay_data(int compile_id);
464 void dump_inline_data(int compile_id);
465 void dump_replay_data(outputStream* out);
466 void dump_replay_data_unsafe(outputStream* out);
467 void dump_compile_data(outputStream* out);
468 };
469
470 #endif // SHARE_VM_CI_CIENV_HPP