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comparison src/share/vm/ci/ciEnv.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 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 class CompileTask;
26
27 // ciEnv
28 //
29 // This class is the top level broker for requests from the compiler
30 // to the VM.
31 class ciEnv : StackObj {
32 CI_PACKAGE_ACCESS_TO
33
34 friend class CompileBroker;
35 friend class Dependencies; // for get_object, during logging
36
37 private:
38 Arena* _arena; // Alias for _ciEnv_arena except in init_shared_objects()
39 Arena _ciEnv_arena;
40 int _system_dictionary_modification_counter;
41 ciObjectFactory* _factory;
42 OopRecorder* _oop_recorder;
43 DebugInformationRecorder* _debug_info;
44 Dependencies* _dependencies;
45 const char* _failure_reason;
46 int _compilable;
47 bool _break_at_compile;
48 int _num_inlined_bytecodes;
49 CompileTask* _task; // faster access to CompilerThread::task
50 CompileLog* _log; // faster access to CompilerThread::log
51 void* _compiler_data; // compiler-specific stuff, if any
52
53 char* _name_buffer;
54 int _name_buffer_len;
55
56 // Distinguished instances of certain ciObjects..
57 static ciObject* _null_object_instance;
58 static ciMethodKlass* _method_klass_instance;
59 static ciSymbolKlass* _symbol_klass_instance;
60 static ciKlassKlass* _klass_klass_instance;
61 static ciInstanceKlassKlass* _instance_klass_klass_instance;
62 static ciTypeArrayKlassKlass* _type_array_klass_klass_instance;
63 static ciObjArrayKlassKlass* _obj_array_klass_klass_instance;
64
65 static ciInstanceKlass* _ArrayStoreException;
66 static ciInstanceKlass* _Class;
67 static ciInstanceKlass* _ClassCastException;
68 static ciInstanceKlass* _Object;
69 static ciInstanceKlass* _Throwable;
70 static ciInstanceKlass* _Thread;
71 static ciInstanceKlass* _OutOfMemoryError;
72 static ciInstanceKlass* _String;
73
74 static ciSymbol* _unloaded_cisymbol;
75 static ciInstanceKlass* _unloaded_ciinstance_klass;
76 static ciObjArrayKlass* _unloaded_ciobjarrayklass;
77
78 static jobject _ArrayIndexOutOfBoundsException_handle;
79 static jobject _ArrayStoreException_handle;
80 static jobject _ClassCastException_handle;
81
82 ciInstance* _NullPointerException_instance;
83 ciInstance* _ArithmeticException_instance;
84 ciInstance* _ArrayIndexOutOfBoundsException_instance;
85 ciInstance* _ArrayStoreException_instance;
86 ciInstance* _ClassCastException_instance;
87
88 // Look up a klass by name from a particular class loader (the accessor's).
89 // If require_local, result must be defined in that class loader, or NULL.
90 // If !require_local, a result from remote class loader may be reported,
91 // if sufficient class loader constraints exist such that initiating
92 // a class loading request from the given loader is bound to return
93 // the class defined in the remote loader (or throw an error).
94 //
95 // Return an unloaded klass if !require_local and no class at all is found.
96 //
97 // The CI treats a klass as loaded if it is consistently defined in
98 // another loader, even if it hasn't yet been loaded in all loaders
99 // that could potentially see it via delegation.
100 ciKlass* get_klass_by_name(ciKlass* accessing_klass,
101 ciSymbol* klass_name,
102 bool require_local);
103
104 // Constant pool access.
105 ciKlass* get_klass_by_index(ciInstanceKlass* loading_klass,
106 int klass_index,
107 bool& is_accessible);
108 ciConstant get_constant_by_index(ciInstanceKlass* loading_klass,
109 int constant_index);
110 bool is_unresolved_string(ciInstanceKlass* loading_klass,
111 int constant_index) const;
112 bool is_unresolved_klass(ciInstanceKlass* loading_klass,
113 int constant_index) const;
114 ciField* get_field_by_index(ciInstanceKlass* loading_klass,
115 int field_index);
116 ciMethod* get_method_by_index(ciInstanceKlass* loading_klass,
117 int method_index, Bytecodes::Code bc);
118
119 // Implementation methods for loading and constant pool access.
120 ciKlass* get_klass_by_name_impl(ciKlass* accessing_klass,
121 ciSymbol* klass_name,
122 bool require_local);
123 ciKlass* get_klass_by_index_impl(ciInstanceKlass* loading_klass,
124 int klass_index,
125 bool& is_accessible);
126 ciConstant get_constant_by_index_impl(ciInstanceKlass* loading_klass,
127 int constant_index);
128 bool is_unresolved_string_impl (instanceKlass* loading_klass,
129 int constant_index) const;
130 bool is_unresolved_klass_impl (instanceKlass* loading_klass,
131 int constant_index) const;
132 ciField* get_field_by_index_impl(ciInstanceKlass* loading_klass,
133 int field_index);
134 ciMethod* get_method_by_index_impl(ciInstanceKlass* loading_klass,
135 int method_index, Bytecodes::Code bc);
136
137 // Helper methods
138 bool check_klass_accessibility(ciKlass* accessing_klass,
139 klassOop resolved_klassOop);
140 methodOop lookup_method(instanceKlass* accessor,
141 instanceKlass* holder,
142 symbolOop name,
143 symbolOop sig,
144 Bytecodes::Code bc);
145
146 // Get a ciObject from the object factory. Ensures uniqueness
147 // of ciObjects.
148 ciObject* get_object(oop o) {
149 if (o == NULL) {
150 return _null_object_instance;
151 } else {
152 return _factory->get(o);
153 }
154 }
155
156 ciMethod* get_method_from_handle(jobject method);
157
158 ciInstance* get_or_create_exception(jobject& handle, symbolHandle name);
159
160 // Get a ciMethod representing either an unfound method or
161 // a method with an unloaded holder. Ensures uniqueness of
162 // the result.
163 ciMethod* get_unloaded_method(ciInstanceKlass* holder,
164 ciSymbol* name,
165 ciSymbol* signature) {
166 return _factory->get_unloaded_method(holder, name, signature);
167 }
168
169 // Get a ciKlass representing an unloaded klass.
170 // Ensures uniqueness of the result.
171 ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
172 ciSymbol* name) {
173 return _factory->get_unloaded_klass(accessing_klass, name, true);
174 }
175
176 // See if we already have an unloaded klass for the given name
177 // or return NULL if not.
178 ciKlass *check_get_unloaded_klass(ciKlass* accessing_klass, ciSymbol* name) {
179 return _factory->get_unloaded_klass(accessing_klass, name, false);
180 }
181
182 // Get a ciReturnAddress corresponding to the given bci.
183 // Ensures uniqueness of the result.
184 ciReturnAddress* get_return_address(int bci) {
185 return _factory->get_return_address(bci);
186 }
187
188 // Get a ciMethodData representing the methodData for a method
189 // with none.
190 ciMethodData* get_empty_methodData() {
191 return _factory->get_empty_methodData();
192 }
193
194 // General utility : get a buffer of some required length.
195 // Used in symbol creation.
196 char* name_buffer(int req_len);
197
198 // Is this thread currently in the VM state?
199 static bool is_in_vm();
200
201 // Helper routine for determining the validity of a compilation
202 // with respect to concurrent class loading.
203 void check_for_system_dictionary_modification(ciMethod* target);
204
205 public:
206 enum {
207 MethodCompilable,
208 MethodCompilable_not_at_tier,
209 MethodCompilable_never
210 };
211
212 ciEnv(CompileTask* task, int system_dictionary_modification_counter);
213 // Used only during initialization of the ci
214 ciEnv(Arena* arena);
215 ~ciEnv();
216
217 OopRecorder* oop_recorder() { return _oop_recorder; }
218 void set_oop_recorder(OopRecorder* r) { _oop_recorder = r; }
219
220 DebugInformationRecorder* debug_info() { return _debug_info; }
221 void set_debug_info(DebugInformationRecorder* i) { _debug_info = i; }
222
223 Dependencies* dependencies() { return _dependencies; }
224 void set_dependencies(Dependencies* d) { _dependencies = d; }
225
226 // This is true if the compilation is not going to produce code.
227 // (It is reasonable to retry failed compilations.)
228 bool failing() { return _failure_reason != NULL; }
229
230 // Reason this compilation is failing, such as "too many basic blocks".
231 const char* failure_reason() { return _failure_reason; }
232
233 // Return state of appropriate compilability
234 int compilable() { return _compilable; }
235
236 bool break_at_compile() { return _break_at_compile; }
237 void set_break_at_compile(bool z) { _break_at_compile = z; }
238
239 // The compiler task which has created this env.
240 // May be useful to find out compile_id, comp_level, etc.
241 CompileTask* task() { return _task; }
242 // Handy forwards to the task:
243 int comp_level(); // task()->comp_level()
244 uint compile_id(); // task()->compile_id()
245
246 // Register the result of a compilation.
247 void register_method(ciMethod* target,
248 int entry_bci,
249 CodeOffsets* offsets,
250 int orig_pc_offset,
251 CodeBuffer* code_buffer,
252 int frame_words,
253 OopMapSet* oop_map_set,
254 ExceptionHandlerTable* handler_table,
255 ImplicitExceptionTable* inc_table,
256 AbstractCompiler* compiler,
257 int comp_level,
258 bool has_debug_info = true,
259 bool has_unsafe_access = false);
260
261
262 // Access to certain well known ciObjects.
263 ciInstanceKlass* ArrayStoreException_klass() {
264 return _ArrayStoreException;
265 }
266 ciInstanceKlass* Class_klass() {
267 return _Class;
268 }
269 ciInstanceKlass* ClassCastException_klass() {
270 return _ClassCastException;
271 }
272 ciInstanceKlass* Object_klass() {
273 return _Object;
274 }
275 ciInstanceKlass* Throwable_klass() {
276 return _Throwable;
277 }
278 ciInstanceKlass* Thread_klass() {
279 return _Thread;
280 }
281 ciInstanceKlass* OutOfMemoryError_klass() {
282 return _OutOfMemoryError;
283 }
284 ciInstanceKlass* String_klass() {
285 return _String;
286 }
287 ciInstance* NullPointerException_instance() {
288 assert(_NullPointerException_instance != NULL, "initialization problem");
289 return _NullPointerException_instance;
290 }
291 ciInstance* ArithmeticException_instance() {
292 assert(_ArithmeticException_instance != NULL, "initialization problem");
293 return _ArithmeticException_instance;
294 }
295
296 // Lazy constructors:
297 ciInstance* ArrayIndexOutOfBoundsException_instance();
298 ciInstance* ArrayStoreException_instance();
299 ciInstance* ClassCastException_instance();
300
301 static ciSymbol* unloaded_cisymbol() {
302 return _unloaded_cisymbol;
303 }
304 static ciObjArrayKlass* unloaded_ciobjarrayklass() {
305 return _unloaded_ciobjarrayklass;
306 }
307 static ciInstanceKlass* unloaded_ciinstance_klass() {
308 return _unloaded_ciinstance_klass;
309 }
310
311 ciKlass* find_system_klass(ciSymbol* klass_name);
312 // Note: To find a class from its name string, use ciSymbol::make,
313 // but consider adding to vmSymbols.hpp instead.
314
315 // Use this to make a holder for non-perm compile time constants.
316 // The resulting array is guaranteed to satisfy "has_encoding".
317 ciArray* make_array(GrowableArray<ciObject*>* objects);
318
319 // converts the ciKlass* representing the holder of a method into a
320 // ciInstanceKlass*. This is needed since the holder of a method in
321 // the bytecodes could be an array type. Basically this converts
322 // array types into java/lang/Object and other types stay as they are.
323 static ciInstanceKlass* get_instance_klass_for_declared_method_holder(ciKlass* klass);
324
325 // Return the machine-level offset of o, which must be an element of a.
326 // This may be used to form constant-loading expressions in lieu of simpler encodings.
327 int array_element_offset_in_bytes(ciArray* a, ciObject* o);
328
329 // Access to the compile-lifetime allocation arena.
330 Arena* arena() { return _arena; }
331
332 // What is the current compilation environment?
333 static ciEnv* current() { return CompilerThread::current()->env(); }
334
335 // Overload with current thread argument
336 static ciEnv* current(CompilerThread *thread) { return thread->env(); }
337
338 // Per-compiler data. (Used by C2 to publish the Compile* pointer.)
339 void* compiler_data() { return _compiler_data; }
340 void set_compiler_data(void* x) { _compiler_data = x; }
341
342 // Notice that a method has been inlined in the current compile;
343 // used only for statistics.
344 void notice_inlined_method(ciMethod* method);
345
346 // Total number of bytecodes in inlined methods in this compile
347 int num_inlined_bytecodes() const;
348
349 // Output stream for logging compilation info.
350 CompileLog* log() { return _log; }
351 void set_log(CompileLog* log) { _log = log; }
352
353 // Check for changes to the system dictionary during compilation
354 bool system_dictionary_modification_counter_changed();
355
356 void record_failure(const char* reason);
357 void record_method_not_compilable(const char* reason, bool all_tiers = true);
358 void record_out_of_memory_failure();
359 };