Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.hpp @ 1202:5f24d0319e54
4360113: Evict nmethods when code cache gets full
Summary: Speculatively unload the oldest nmethods when code cache gets full.
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com
author | kvn |
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date | Fri, 29 Jan 2010 09:27:22 -0800 |
parents | 24128c2ffa87 |
children | 18a389214829 |
rev | line source |
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0 | 1 /* |
1201 | 2 * Copyright 1997-2009 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 // This class is used internally by nmethods, to cache | |
26 // exception/pc/handler information. | |
27 | |
28 class ExceptionCache : public CHeapObj { | |
29 friend class VMStructs; | |
30 private: | |
31 static address _unwind_handler; | |
32 enum { cache_size = 16 }; | |
33 klassOop _exception_type; | |
34 address _pc[cache_size]; | |
35 address _handler[cache_size]; | |
36 int _count; | |
37 ExceptionCache* _next; | |
38 | |
39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; } | |
40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; } | |
41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; } | |
42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; } | |
43 int count() { return _count; } | |
44 void increment_count() { _count++; } | |
45 | |
46 public: | |
47 | |
48 ExceptionCache(Handle exception, address pc, address handler); | |
49 | |
50 klassOop exception_type() { return _exception_type; } | |
51 klassOop* exception_type_addr() { return &_exception_type; } | |
52 ExceptionCache* next() { return _next; } | |
53 void set_next(ExceptionCache *ec) { _next = ec; } | |
54 | |
55 address match(Handle exception, address pc); | |
56 bool match_exception_with_space(Handle exception) ; | |
57 address test_address(address addr); | |
58 bool add_address_and_handler(address addr, address handler) ; | |
59 | |
60 static address unwind_handler() { return _unwind_handler; } | |
61 }; | |
62 | |
63 | |
64 // cache pc descs found in earlier inquiries | |
65 class PcDescCache VALUE_OBJ_CLASS_SPEC { | |
66 friend class VMStructs; | |
67 private: | |
68 enum { cache_size = 4 }; | |
69 PcDesc* _last_pc_desc; // most recent pc_desc found | |
70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found | |
71 public: | |
72 PcDescCache() { debug_only(_last_pc_desc = NULL); } | |
73 void reset_to(PcDesc* initial_pc_desc); | |
74 PcDesc* find_pc_desc(int pc_offset, bool approximate); | |
75 void add_pc_desc(PcDesc* pc_desc); | |
76 PcDesc* last_pc_desc() { return _last_pc_desc; } | |
77 }; | |
78 | |
79 | |
80 // nmethods (native methods) are the compiled code versions of Java methods. | |
81 | |
82 struct nmFlags { | |
83 friend class VMStructs; | |
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84 unsigned int version:8; // version number (0 = first version) |
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85 unsigned int level:4; // optimization level |
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86 unsigned int age:4; // age (in # of sweep steps) |
0 | 87 |
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88 unsigned int state:2; // {alive, zombie, unloaded) |
0 | 89 |
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90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap? |
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91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures |
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92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies |
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93 unsigned int markedForReclamation:1; // Used by NMethodSweeper |
0 | 94 |
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95 unsigned int has_unsafe_access:1; // May fault due to unsafe access. |
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96 unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes? |
0 | 97 |
1202 | 98 unsigned int speculatively_disconnected:1; // Marked for potential unload |
99 | |
0 | 100 void clear(); |
101 }; | |
102 | |
103 | |
104 // A nmethod contains: | |
105 // - header (the nmethod structure) | |
106 // [Relocation] | |
107 // - relocation information | |
108 // - constant part (doubles, longs and floats used in nmethod) | |
109 // [Code] | |
110 // - code body | |
111 // - exception handler | |
112 // - stub code | |
113 // [Debugging information] | |
114 // - oop array | |
115 // - data array | |
116 // - pcs | |
117 // [Exception handler table] | |
118 // - handler entry point array | |
119 // [Implicit Null Pointer exception table] | |
120 // - implicit null table array | |
121 | |
122 class Dependencies; | |
123 class ExceptionHandlerTable; | |
124 class ImplicitExceptionTable; | |
125 class AbstractCompiler; | |
126 class xmlStream; | |
127 | |
128 class nmethod : public CodeBlob { | |
129 friend class VMStructs; | |
130 friend class NMethodSweeper; | |
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131 friend class CodeCache; // non-perm oops |
0 | 132 private: |
133 // Shared fields for all nmethod's | |
134 static int _zombie_instruction_size; | |
135 | |
136 methodOop _method; | |
137 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method | |
138 | |
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139 // To support simple linked-list chaining of nmethods: |
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140 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head |
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141 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods |
1202 | 142 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect |
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143 |
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144 static nmethod* volatile _oops_do_mark_nmethods; |
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145 nmethod* volatile _oops_do_mark_link; |
0 | 146 |
147 AbstractCompiler* _compiler; // The compiler which compiled this nmethod | |
148 | |
149 // Offsets for different nmethod parts | |
150 int _exception_offset; | |
1201 | 151 // All deoptee's will resume execution at this location described by this offset |
0 | 152 int _deoptimize_offset; |
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153 #ifdef HAVE_DTRACE_H |
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154 int _trap_offset; |
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155 #endif // def HAVE_DTRACE_H |
0 | 156 int _stub_offset; |
157 int _consts_offset; | |
158 int _scopes_data_offset; | |
159 int _scopes_pcs_offset; | |
160 int _dependencies_offset; | |
161 int _handler_table_offset; | |
162 int _nul_chk_table_offset; | |
163 int _nmethod_end_offset; | |
164 | |
165 // location in frame (offset for sp) that deopt can store the original | |
166 // pc during a deopt. | |
167 int _orig_pc_offset; | |
168 | |
169 int _compile_id; // which compilation made this nmethod | |
170 int _comp_level; // compilation level | |
171 | |
172 // offsets for entry points | |
173 address _entry_point; // entry point with class check | |
174 address _verified_entry_point; // entry point without class check | |
175 address _osr_entry_point; // entry point for on stack replacement | |
176 | |
177 nmFlags flags; // various flags to keep track of nmethod state | |
178 bool _markedForDeoptimization; // Used for stack deoptimization | |
179 enum { alive = 0, | |
605 | 180 not_entrant = 1, // uncommon trap has happened but activations may still exist |
0 | 181 zombie = 2, |
182 unloaded = 3 }; | |
183 | |
184 // used by jvmti to track if an unload event has been posted for this nmethod. | |
185 bool _unload_reported; | |
186 | |
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187 jbyte _scavenge_root_state; |
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188 |
0 | 189 NOT_PRODUCT(bool _has_debug_info; ) |
190 | |
191 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) | |
192 jint _lock_count; | |
193 | |
194 // not_entrant method removal. Each mark_sweep pass will update | |
195 // this mark to current sweep invocation count if it is seen on the | |
196 // stack. An not_entrant method can be removed when there is no | |
197 // more activations, i.e., when the _stack_traversal_mark is less than | |
198 // current sweep traversal index. | |
199 long _stack_traversal_mark; | |
200 | |
201 ExceptionCache *_exception_cache; | |
202 PcDescCache _pc_desc_cache; | |
203 | |
204 // These are only used for compiled synchronized native methods to | |
205 // locate the owner and stack slot for the BasicLock so that we can | |
206 // properly revoke the bias of the owner if necessary. They are | |
207 // needed because there is no debug information for compiled native | |
208 // wrappers and the oop maps are insufficient to allow | |
209 // frame::retrieve_receiver() to work. Currently they are expected | |
210 // to be byte offsets from the Java stack pointer for maximum code | |
211 // sharing between platforms. Note that currently biased locking | |
212 // will never cause Class instances to be biased but this code | |
213 // handles the static synchronized case as well. | |
214 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset; | |
215 ByteSize _compiled_synchronized_native_basic_lock_sp_offset; | |
216 | |
217 friend class nmethodLocker; | |
218 | |
219 // For native wrappers | |
220 nmethod(methodOop method, | |
221 int nmethod_size, | |
222 CodeOffsets* offsets, | |
223 CodeBuffer *code_buffer, | |
224 int frame_size, | |
225 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ | |
226 ByteSize basic_lock_sp_offset, /* synchronized natives only */ | |
227 OopMapSet* oop_maps); | |
228 | |
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229 #ifdef HAVE_DTRACE_H |
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230 // For native wrappers |
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231 nmethod(methodOop method, |
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232 int nmethod_size, |
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233 CodeOffsets* offsets, |
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234 CodeBuffer *code_buffer, |
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235 int frame_size); |
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236 #endif // def HAVE_DTRACE_H |
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237 |
0 | 238 // Creation support |
239 nmethod(methodOop method, | |
240 int nmethod_size, | |
241 int compile_id, | |
242 int entry_bci, | |
243 CodeOffsets* offsets, | |
244 int orig_pc_offset, | |
245 DebugInformationRecorder *recorder, | |
246 Dependencies* dependencies, | |
247 CodeBuffer *code_buffer, | |
248 int frame_size, | |
249 OopMapSet* oop_maps, | |
250 ExceptionHandlerTable* handler_table, | |
251 ImplicitExceptionTable* nul_chk_table, | |
252 AbstractCompiler* compiler, | |
253 int comp_level); | |
254 | |
255 // helper methods | |
256 void* operator new(size_t size, int nmethod_size); | |
257 | |
258 const char* reloc_string_for(u_char* begin, u_char* end); | |
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259 // Returns true if this thread changed the state of the nmethod or |
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260 // false if another thread performed the transition. |
1141 | 261 bool make_not_entrant_or_zombie(unsigned int state); |
0 | 262 void inc_decompile_count(); |
263 | |
264 // used to check that writes to nmFlags are done consistently. | |
265 static void check_safepoint() PRODUCT_RETURN; | |
266 | |
267 // Used to manipulate the exception cache | |
268 void add_exception_cache_entry(ExceptionCache* new_entry); | |
269 ExceptionCache* exception_cache_entry_for_exception(Handle exception); | |
270 | |
271 // Inform external interfaces that a compiled method has been unloaded | |
272 inline void post_compiled_method_unload(); | |
273 | |
274 public: | |
275 // create nmethod with entry_bci | |
276 static nmethod* new_nmethod(methodHandle method, | |
277 int compile_id, | |
278 int entry_bci, | |
279 CodeOffsets* offsets, | |
280 int orig_pc_offset, | |
281 DebugInformationRecorder* recorder, | |
282 Dependencies* dependencies, | |
283 CodeBuffer *code_buffer, | |
284 int frame_size, | |
285 OopMapSet* oop_maps, | |
286 ExceptionHandlerTable* handler_table, | |
287 ImplicitExceptionTable* nul_chk_table, | |
288 AbstractCompiler* compiler, | |
289 int comp_level); | |
290 | |
291 static nmethod* new_native_nmethod(methodHandle method, | |
292 CodeBuffer *code_buffer, | |
293 int vep_offset, | |
294 int frame_complete, | |
295 int frame_size, | |
296 ByteSize receiver_sp_offset, | |
297 ByteSize basic_lock_sp_offset, | |
298 OopMapSet* oop_maps); | |
299 | |
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300 #ifdef HAVE_DTRACE_H |
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301 // The method we generate for a dtrace probe has to look |
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302 // like an nmethod as far as the rest of the system is concerned |
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303 // which is somewhat unfortunate. |
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304 static nmethod* new_dtrace_nmethod(methodHandle method, |
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305 CodeBuffer *code_buffer, |
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306 int vep_offset, |
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307 int trap_offset, |
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308 int frame_complete, |
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309 int frame_size); |
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310 |
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311 int trap_offset() const { return _trap_offset; } |
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312 address trap_address() const { return code_begin() + _trap_offset; } |
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313 |
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314 #endif // def HAVE_DTRACE_H |
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315 |
0 | 316 // accessors |
317 methodOop method() const { return _method; } | |
318 AbstractCompiler* compiler() const { return _compiler; } | |
319 | |
320 #ifndef PRODUCT | |
321 bool has_debug_info() const { return _has_debug_info; } | |
322 void set_has_debug_info(bool f) { _has_debug_info = false; } | |
323 #endif // NOT PRODUCT | |
324 | |
325 // type info | |
326 bool is_nmethod() const { return true; } | |
327 bool is_java_method() const { return !method()->is_native(); } | |
328 bool is_native_method() const { return method()->is_native(); } | |
329 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } | |
330 | |
331 bool is_compiled_by_c1() const; | |
332 bool is_compiled_by_c2() const; | |
333 | |
334 // boundaries for different parts | |
1201 | 335 address code_begin () const { return _entry_point; } |
336 address code_end () const { return header_begin() + _stub_offset ; } | |
337 address exception_begin () const { return header_begin() + _exception_offset ; } | |
338 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; } | |
339 address stub_begin () const { return header_begin() + _stub_offset ; } | |
340 address stub_end () const { return header_begin() + _consts_offset ; } | |
341 address consts_begin () const { return header_begin() + _consts_offset ; } | |
342 address consts_end () const { return header_begin() + _scopes_data_offset ; } | |
343 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } | |
344 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } | |
345 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } | |
346 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); } | |
347 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } | |
348 address dependencies_end () const { return header_begin() + _handler_table_offset ; } | |
349 address handler_table_begin() const { return header_begin() + _handler_table_offset ; } | |
350 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } | |
351 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; } | |
352 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } | |
0 | 353 |
354 int code_size () const { return code_end () - code_begin (); } | |
355 int stub_size () const { return stub_end () - stub_begin (); } | |
356 int consts_size () const { return consts_end () - consts_begin (); } | |
357 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } | |
358 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); } | |
359 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } | |
360 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } | |
361 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } | |
362 | |
363 int total_size () const; | |
364 | |
365 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); } | |
366 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } | |
367 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } | |
368 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } | |
369 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } | |
370 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } | |
371 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } | |
372 | |
373 // entry points | |
374 address entry_point() const { return _entry_point; } // normal entry point | |
375 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct | |
376 | |
377 // flag accessing and manipulation | |
378 bool is_in_use() const { return flags.state == alive; } | |
379 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; } | |
380 bool is_not_entrant() const { return flags.state == not_entrant; } | |
381 bool is_zombie() const { return flags.state == zombie; } | |
382 bool is_unloaded() const { return flags.state == unloaded; } | |
383 | |
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384 // Make the nmethod non entrant. The nmethod will continue to be |
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385 // alive. It is used when an uncommon trap happens. Returns true |
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386 // if this thread changed the state of the nmethod or false if |
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387 // another thread performed the transition. |
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388 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } |
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389 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } |
0 | 390 |
391 // used by jvmti to track if the unload event has been reported | |
392 bool unload_reported() { return _unload_reported; } | |
393 void set_unload_reported() { _unload_reported = true; } | |
394 | |
395 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; } | |
396 void mark_for_deoptimization() { _markedForDeoptimization = true; } | |
397 | |
398 void make_unloaded(BoolObjectClosure* is_alive, oop cause); | |
399 | |
400 bool has_dependencies() { return dependencies_size() != 0; } | |
401 void flush_dependencies(BoolObjectClosure* is_alive); | |
402 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; } | |
403 void set_has_flushed_dependencies() { | |
404 check_safepoint(); | |
405 assert(!has_flushed_dependencies(), "should only happen once"); | |
406 flags.hasFlushedDependencies = 1; | |
407 } | |
408 | |
409 bool is_marked_for_reclamation() const { return flags.markedForReclamation; } | |
410 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; } | |
411 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; } | |
412 | |
413 bool has_unsafe_access() const { return flags.has_unsafe_access; } | |
414 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; } | |
415 | |
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416 bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; } |
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417 void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; } |
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418 |
1202 | 419 bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; } |
420 void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; } | |
421 | |
0 | 422 int level() const { return flags.level; } |
423 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; } | |
424 | |
425 int comp_level() const { return _comp_level; } | |
426 | |
427 int version() const { return flags.version; } | |
428 void set_version(int v); | |
429 | |
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430 // Non-perm oop support |
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431 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } |
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432 protected: |
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433 enum { npl_on_list = 0x01, npl_marked = 0x10 }; |
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434 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } |
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435 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } |
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436 // assertion-checking and pruning logic uses the bits of _scavenge_root_state |
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437 #ifndef PRODUCT |
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438 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } |
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439 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } |
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440 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } |
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441 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. |
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442 #endif //PRODUCT |
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443 nmethod* scavenge_root_link() const { return _scavenge_root_link; } |
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444 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } |
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445 |
1202 | 446 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; } |
447 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; } | |
448 | |
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449 public: |
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450 |
0 | 451 // Sweeper support |
452 long stack_traversal_mark() { return _stack_traversal_mark; } | |
453 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } | |
454 | |
455 // Exception cache support | |
456 ExceptionCache* exception_cache() const { return _exception_cache; } | |
457 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } | |
458 address handler_for_exception_and_pc(Handle exception, address pc); | |
459 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); | |
460 void remove_from_exception_cache(ExceptionCache* ec); | |
461 | |
462 // implicit exceptions support | |
463 address continuation_for_implicit_exception(address pc); | |
464 | |
465 // On-stack replacement support | |
466 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } | |
467 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } | |
468 void invalidate_osr_method(); | |
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469 nmethod* osr_link() const { return _osr_link; } |
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470 void set_osr_link(nmethod *n) { _osr_link = n; } |
0 | 471 |
472 // tells whether frames described by this nmethod can be deoptimized | |
473 // note: native wrappers cannot be deoptimized. | |
474 bool can_be_deoptimized() const { return is_java_method(); } | |
475 | |
476 // Inline cache support | |
477 void clear_inline_caches(); | |
478 void cleanup_inline_caches(); | |
479 bool inlinecache_check_contains(address addr) const { | |
480 return (addr >= instructions_begin() && addr < verified_entry_point()); | |
481 } | |
482 | |
483 // unlink and deallocate this nmethod | |
484 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not | |
485 // expected to use any other private methods/data in this class. | |
486 | |
487 protected: | |
488 void flush(); | |
489 | |
490 public: | |
491 // If returning true, it is unsafe to remove this nmethod even though it is a zombie | |
492 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. | |
493 bool is_locked_by_vm() const { return _lock_count >0; } | |
494 | |
495 // See comment at definition of _last_seen_on_stack | |
496 void mark_as_seen_on_stack(); | |
497 bool can_not_entrant_be_converted(); | |
498 | |
499 // Evolution support. We make old (discarded) compiled methods point to new methodOops. | |
500 void set_method(methodOop method) { _method = method; } | |
501 | |
502 // GC support | |
503 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, | |
504 bool unloading_occurred); | |
505 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, | |
506 oop* root, bool unloading_occurred); | |
507 | |
508 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, | |
509 OopClosure* f); | |
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510 virtual void oops_do(OopClosure* f) { oops_do(f, false); } |
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511 void oops_do(OopClosure* f, bool do_strong_roots_only); |
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512 bool detect_scavenge_root_oops(); |
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513 void verify_scavenge_root_oops() PRODUCT_RETURN; |
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514 |
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515 bool test_set_oops_do_mark(); |
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516 static void oops_do_marking_prologue(); |
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517 static void oops_do_marking_epilogue(); |
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518 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } |
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519 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) |
0 | 520 |
521 // ScopeDesc for an instruction | |
522 ScopeDesc* scope_desc_at(address pc); | |
523 | |
524 private: | |
525 ScopeDesc* scope_desc_in(address begin, address end); | |
526 | |
1201 | 527 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } |
0 | 528 |
529 PcDesc* find_pc_desc_internal(address pc, bool approximate); | |
530 | |
531 PcDesc* find_pc_desc(address pc, bool approximate) { | |
532 PcDesc* desc = _pc_desc_cache.last_pc_desc(); | |
533 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) { | |
534 return desc; | |
535 } | |
536 return find_pc_desc_internal(pc, approximate); | |
537 } | |
538 | |
539 public: | |
540 // ScopeDesc retrieval operation | |
541 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } | |
542 // pc_desc_near returns the first PcDesc at or after the givne pc. | |
543 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } | |
544 | |
545 public: | |
546 // copying of debugging information | |
547 void copy_scopes_pcs(PcDesc* pcs, int count); | |
548 void copy_scopes_data(address buffer, int size); | |
549 | |
1201 | 550 // deopt |
551 // return true is the pc is one would expect if the frame is being deopted. | |
552 bool is_deopt_pc(address pc); | |
0 | 553 // Accessor/mutator for the original pc of a frame before a frame was deopted. |
554 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } | |
555 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } | |
556 | |
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557 // MethodHandle |
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558 bool is_method_handle_return(address return_pc); |
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559 |
0 | 560 // jvmti support: |
561 void post_compiled_method_load_event(); | |
562 | |
563 // verify operations | |
564 void verify(); | |
565 void verify_scopes(); | |
566 void verify_interrupt_point(address interrupt_point); | |
567 | |
568 // printing support | |
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569 void print() const; |
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570 void print_code(); |
0 | 571 void print_relocations() PRODUCT_RETURN; |
572 void print_pcs() PRODUCT_RETURN; | |
573 void print_scopes() PRODUCT_RETURN; | |
574 void print_dependencies() PRODUCT_RETURN; | |
575 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
576 void print_calls(outputStream* st) PRODUCT_RETURN; | |
577 void print_handler_table() PRODUCT_RETURN; | |
578 void print_nul_chk_table() PRODUCT_RETURN; | |
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579 void print_nmethod(bool print_code); |
0 | 580 |
581 void print_on(outputStream* st, const char* title) const; | |
582 | |
583 // Logging | |
584 void log_identity(xmlStream* log) const; | |
585 void log_new_nmethod() const; | |
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586 void log_state_change() const; |
0 | 587 |
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588 // Prints block-level comments, including nmethod specific block labels: |
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589 virtual void print_block_comment(outputStream* stream, address block_begin) { |
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590 print_nmethod_labels(stream, block_begin); |
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591 CodeBlob::print_block_comment(stream, block_begin); |
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592 } |
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593 void print_nmethod_labels(outputStream* stream, address block_begin); |
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594 |
0 | 595 // Prints a comment for one native instruction (reloc info, pc desc) |
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596 void print_code_comment_on(outputStream* st, int column, address begin, address end); |
0 | 597 static void print_statistics() PRODUCT_RETURN; |
598 | |
599 // Compiler task identification. Note that all OSR methods | |
600 // are numbered in an independent sequence if CICountOSR is true, | |
601 // and native method wrappers are also numbered independently if | |
602 // CICountNative is true. | |
603 int compile_id() const { return _compile_id; } | |
604 const char* compile_kind() const; | |
605 | |
606 // For debugging | |
607 // CompiledIC* IC_at(char* p) const; | |
608 // PrimitiveIC* primitiveIC_at(char* p) const; | |
609 oop embeddedOop_at(address p); | |
610 | |
611 // tells if any of this method's dependencies have been invalidated | |
612 // (this is expensive!) | |
613 bool check_all_dependencies(); | |
614 | |
615 // tells if this compiled method is dependent on the given changes, | |
616 // and the changes have invalidated it | |
617 bool check_dependency_on(DepChange& changes); | |
618 | |
619 // Evolution support. Tells if this compiled method is dependent on any of | |
620 // methods m() of class dependee, such that if m() in dependee is replaced, | |
621 // this compiled method will have to be deoptimized. | |
622 bool is_evol_dependent_on(klassOop dependee); | |
623 | |
624 // Fast breakpoint support. Tells if this compiled method is | |
625 // dependent on the given method. Returns true if this nmethod | |
626 // corresponds to the given method as well. | |
627 bool is_dependent_on_method(methodOop dependee); | |
628 | |
629 // is it ok to patch at address? | |
630 bool is_patchable_at(address instr_address); | |
631 | |
632 // UseBiasedLocking support | |
633 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { | |
634 return _compiled_synchronized_native_basic_lock_owner_sp_offset; | |
635 } | |
636 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { | |
637 return _compiled_synchronized_native_basic_lock_sp_offset; | |
638 } | |
639 | |
640 // support for code generation | |
641 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } | |
642 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } | |
643 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } | |
644 | |
645 }; | |
646 | |
647 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method | |
648 class nmethodLocker : public StackObj { | |
649 nmethod* _nm; | |
650 | |
651 static void lock_nmethod(nmethod* nm); // note: nm can be NULL | |
652 static void unlock_nmethod(nmethod* nm); // (ditto) | |
653 | |
654 public: | |
655 nmethodLocker(address pc); // derive nm from pc | |
656 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } | |
657 nmethodLocker() { _nm = NULL; } | |
658 ~nmethodLocker() { unlock_nmethod(_nm); } | |
659 | |
660 nmethod* code() { return _nm; } | |
661 void set_code(nmethod* new_nm) { | |
662 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. | |
663 _nm = new_nm; | |
664 lock_nmethod(_nm); | |
665 } | |
666 }; |