Mercurial > hg > truffle
annotate src/share/vm/code/nmethod.hpp @ 1000:a1423fe86a18
Merge
| author | trims |
|---|---|
| date | Fri, 09 Oct 2009 15:18:52 -0700 |
| parents | 89e0543e1737 753cf9794df9 |
| children | 032260830071 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 948 | 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; | |
| 84 unsigned int version:8; // version number (0 = first version) | |
| 85 unsigned int level:4; // optimization level | |
| 86 unsigned int age:4; // age (in # of sweep steps) | |
| 87 | |
| 88 unsigned int state:2; // {alive, zombie, unloaded) | |
| 89 | |
| 90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap? | |
| 91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures | |
| 92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies | |
| 93 unsigned int markedForReclamation:1; // Used by NMethodSweeper | |
| 94 | |
| 95 unsigned int has_unsafe_access:1; // May fault due to unsafe access. | |
| 96 | |
| 97 void clear(); | |
| 98 }; | |
| 99 | |
| 100 | |
| 101 // A nmethod contains: | |
| 102 // - header (the nmethod structure) | |
| 103 // [Relocation] | |
| 104 // - relocation information | |
| 105 // - constant part (doubles, longs and floats used in nmethod) | |
| 106 // [Code] | |
| 107 // - code body | |
| 108 // - exception handler | |
| 109 // - stub code | |
| 110 // [Debugging information] | |
| 111 // - oop array | |
| 112 // - data array | |
| 113 // - pcs | |
| 114 // [Exception handler table] | |
| 115 // - handler entry point array | |
| 116 // [Implicit Null Pointer exception table] | |
| 117 // - implicit null table array | |
| 118 | |
| 119 class Dependencies; | |
| 120 class ExceptionHandlerTable; | |
| 121 class ImplicitExceptionTable; | |
| 122 class AbstractCompiler; | |
| 123 class xmlStream; | |
| 124 | |
| 125 class nmethod : public CodeBlob { | |
| 126 friend class VMStructs; | |
| 127 friend class NMethodSweeper; | |
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128 friend class CodeCache; // non-perm oops |
| 0 | 129 private: |
| 130 // Shared fields for all nmethod's | |
| 131 static int _zombie_instruction_size; | |
| 132 | |
| 133 methodOop _method; | |
| 134 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method | |
| 135 | |
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136 // To support simple linked-list chaining of nmethods: |
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137 nmethod* _osr_link; // from instanceKlass::osr_nmethods_head |
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138 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods |
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139 |
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140 static nmethod* volatile _oops_do_mark_nmethods; |
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141 nmethod* volatile _oops_do_mark_link; |
| 0 | 142 |
| 143 AbstractCompiler* _compiler; // The compiler which compiled this nmethod | |
| 144 | |
| 145 // Offsets for different nmethod parts | |
| 146 int _exception_offset; | |
| 147 // All deoptee's will resume execution at this location described by this offset | |
| 148 int _deoptimize_offset; | |
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149 #ifdef HAVE_DTRACE_H |
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150 int _trap_offset; |
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151 #endif // def HAVE_DTRACE_H |
| 0 | 152 int _stub_offset; |
| 153 int _consts_offset; | |
| 154 int _scopes_data_offset; | |
| 155 int _scopes_pcs_offset; | |
| 156 int _dependencies_offset; | |
| 157 int _handler_table_offset; | |
| 158 int _nul_chk_table_offset; | |
| 159 int _nmethod_end_offset; | |
| 160 | |
| 161 // location in frame (offset for sp) that deopt can store the original | |
| 162 // pc during a deopt. | |
| 163 int _orig_pc_offset; | |
| 164 | |
| 165 int _compile_id; // which compilation made this nmethod | |
| 166 int _comp_level; // compilation level | |
| 167 | |
| 168 // offsets for entry points | |
| 169 address _entry_point; // entry point with class check | |
| 170 address _verified_entry_point; // entry point without class check | |
| 171 address _osr_entry_point; // entry point for on stack replacement | |
| 172 | |
| 173 nmFlags flags; // various flags to keep track of nmethod state | |
| 174 bool _markedForDeoptimization; // Used for stack deoptimization | |
| 175 enum { alive = 0, | |
| 605 | 176 not_entrant = 1, // uncommon trap has happened but activations may still exist |
| 0 | 177 zombie = 2, |
| 178 unloaded = 3 }; | |
| 179 | |
| 180 // used by jvmti to track if an unload event has been posted for this nmethod. | |
| 181 bool _unload_reported; | |
| 182 | |
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183 jbyte _scavenge_root_state; |
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184 |
| 0 | 185 NOT_PRODUCT(bool _has_debug_info; ) |
| 186 | |
| 187 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) | |
| 188 jint _lock_count; | |
| 189 | |
| 190 // not_entrant method removal. Each mark_sweep pass will update | |
| 191 // this mark to current sweep invocation count if it is seen on the | |
| 192 // stack. An not_entrant method can be removed when there is no | |
| 193 // more activations, i.e., when the _stack_traversal_mark is less than | |
| 194 // current sweep traversal index. | |
| 195 long _stack_traversal_mark; | |
| 196 | |
| 197 ExceptionCache *_exception_cache; | |
| 198 PcDescCache _pc_desc_cache; | |
| 199 | |
| 200 // These are only used for compiled synchronized native methods to | |
| 201 // locate the owner and stack slot for the BasicLock so that we can | |
| 202 // properly revoke the bias of the owner if necessary. They are | |
| 203 // needed because there is no debug information for compiled native | |
| 204 // wrappers and the oop maps are insufficient to allow | |
| 205 // frame::retrieve_receiver() to work. Currently they are expected | |
| 206 // to be byte offsets from the Java stack pointer for maximum code | |
| 207 // sharing between platforms. Note that currently biased locking | |
| 208 // will never cause Class instances to be biased but this code | |
| 209 // handles the static synchronized case as well. | |
| 210 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset; | |
| 211 ByteSize _compiled_synchronized_native_basic_lock_sp_offset; | |
| 212 | |
| 213 friend class nmethodLocker; | |
| 214 | |
| 215 // For native wrappers | |
| 216 nmethod(methodOop method, | |
| 217 int nmethod_size, | |
| 218 CodeOffsets* offsets, | |
| 219 CodeBuffer *code_buffer, | |
| 220 int frame_size, | |
| 221 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */ | |
| 222 ByteSize basic_lock_sp_offset, /* synchronized natives only */ | |
| 223 OopMapSet* oop_maps); | |
| 224 | |
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225 #ifdef HAVE_DTRACE_H |
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226 // For native wrappers |
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227 nmethod(methodOop method, |
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228 int nmethod_size, |
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229 CodeOffsets* offsets, |
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230 CodeBuffer *code_buffer, |
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231 int frame_size); |
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232 #endif // def HAVE_DTRACE_H |
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233 |
| 0 | 234 // Creation support |
| 235 nmethod(methodOop method, | |
| 236 int nmethod_size, | |
| 237 int compile_id, | |
| 238 int entry_bci, | |
| 239 CodeOffsets* offsets, | |
| 240 int orig_pc_offset, | |
| 241 DebugInformationRecorder *recorder, | |
| 242 Dependencies* dependencies, | |
| 243 CodeBuffer *code_buffer, | |
| 244 int frame_size, | |
| 245 OopMapSet* oop_maps, | |
| 246 ExceptionHandlerTable* handler_table, | |
| 247 ImplicitExceptionTable* nul_chk_table, | |
| 248 AbstractCompiler* compiler, | |
| 249 int comp_level); | |
| 250 | |
| 251 // helper methods | |
| 252 void* operator new(size_t size, int nmethod_size); | |
| 253 | |
| 254 const char* reloc_string_for(u_char* begin, u_char* end); | |
| 255 void make_not_entrant_or_zombie(int state); | |
| 256 void inc_decompile_count(); | |
| 257 | |
| 258 // used to check that writes to nmFlags are done consistently. | |
| 259 static void check_safepoint() PRODUCT_RETURN; | |
| 260 | |
| 261 // Used to manipulate the exception cache | |
| 262 void add_exception_cache_entry(ExceptionCache* new_entry); | |
| 263 ExceptionCache* exception_cache_entry_for_exception(Handle exception); | |
| 264 | |
| 265 // Inform external interfaces that a compiled method has been unloaded | |
| 266 inline void post_compiled_method_unload(); | |
| 267 | |
| 268 public: | |
| 269 // create nmethod with entry_bci | |
| 270 static nmethod* new_nmethod(methodHandle method, | |
| 271 int compile_id, | |
| 272 int entry_bci, | |
| 273 CodeOffsets* offsets, | |
| 274 int orig_pc_offset, | |
| 275 DebugInformationRecorder* recorder, | |
| 276 Dependencies* dependencies, | |
| 277 CodeBuffer *code_buffer, | |
| 278 int frame_size, | |
| 279 OopMapSet* oop_maps, | |
| 280 ExceptionHandlerTable* handler_table, | |
| 281 ImplicitExceptionTable* nul_chk_table, | |
| 282 AbstractCompiler* compiler, | |
| 283 int comp_level); | |
| 284 | |
| 285 static nmethod* new_native_nmethod(methodHandle method, | |
| 286 CodeBuffer *code_buffer, | |
| 287 int vep_offset, | |
| 288 int frame_complete, | |
| 289 int frame_size, | |
| 290 ByteSize receiver_sp_offset, | |
| 291 ByteSize basic_lock_sp_offset, | |
| 292 OopMapSet* oop_maps); | |
| 293 | |
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294 #ifdef HAVE_DTRACE_H |
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295 // The method we generate for a dtrace probe has to look |
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296 // like an nmethod as far as the rest of the system is concerned |
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297 // which is somewhat unfortunate. |
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298 static nmethod* new_dtrace_nmethod(methodHandle method, |
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299 CodeBuffer *code_buffer, |
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300 int vep_offset, |
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301 int trap_offset, |
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302 int frame_complete, |
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303 int frame_size); |
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304 |
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305 int trap_offset() const { return _trap_offset; } |
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306 address trap_address() const { return code_begin() + _trap_offset; } |
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307 |
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308 #endif // def HAVE_DTRACE_H |
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309 |
| 0 | 310 // accessors |
| 311 methodOop method() const { return _method; } | |
| 312 AbstractCompiler* compiler() const { return _compiler; } | |
| 313 | |
| 314 #ifndef PRODUCT | |
| 315 bool has_debug_info() const { return _has_debug_info; } | |
| 316 void set_has_debug_info(bool f) { _has_debug_info = false; } | |
| 317 #endif // NOT PRODUCT | |
| 318 | |
| 319 // type info | |
| 320 bool is_nmethod() const { return true; } | |
| 321 bool is_java_method() const { return !method()->is_native(); } | |
| 322 bool is_native_method() const { return method()->is_native(); } | |
| 323 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; } | |
| 324 | |
| 325 bool is_compiled_by_c1() const; | |
| 326 bool is_compiled_by_c2() const; | |
| 327 | |
| 328 // boundaries for different parts | |
| 329 address code_begin () const { return _entry_point; } | |
| 330 address code_end () const { return header_begin() + _stub_offset ; } | |
| 331 address exception_begin () const { return header_begin() + _exception_offset ; } | |
| 332 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; } | |
| 333 address stub_begin () const { return header_begin() + _stub_offset ; } | |
| 334 address stub_end () const { return header_begin() + _consts_offset ; } | |
| 335 address consts_begin () const { return header_begin() + _consts_offset ; } | |
| 336 address consts_end () const { return header_begin() + _scopes_data_offset ; } | |
| 337 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; } | |
| 338 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; } | |
| 339 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); } | |
| 340 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); } | |
| 341 address dependencies_begin () const { return header_begin() + _dependencies_offset ; } | |
| 342 address dependencies_end () const { return header_begin() + _handler_table_offset ; } | |
| 343 address handler_table_begin() const { return header_begin() + _handler_table_offset ; } | |
| 344 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; } | |
| 345 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; } | |
| 346 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; } | |
| 347 | |
| 348 int code_size () const { return code_end () - code_begin (); } | |
| 349 int stub_size () const { return stub_end () - stub_begin (); } | |
| 350 int consts_size () const { return consts_end () - consts_begin (); } | |
| 351 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); } | |
| 352 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); } | |
| 353 int dependencies_size () const { return dependencies_end () - dependencies_begin (); } | |
| 354 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } | |
| 355 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } | |
| 356 | |
| 357 int total_size () const; | |
| 358 | |
| 359 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); } | |
| 360 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } | |
| 361 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } | |
| 362 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); } | |
| 363 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); } | |
| 364 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); } | |
| 365 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); } | |
| 366 | |
| 367 // entry points | |
| 368 address entry_point() const { return _entry_point; } // normal entry point | |
| 369 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct | |
| 370 | |
| 371 // flag accessing and manipulation | |
| 372 bool is_in_use() const { return flags.state == alive; } | |
| 373 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; } | |
| 374 bool is_not_entrant() const { return flags.state == not_entrant; } | |
| 375 bool is_zombie() const { return flags.state == zombie; } | |
| 376 bool is_unloaded() const { return flags.state == unloaded; } | |
| 377 | |
| 378 // Make the nmethod non entrant. The nmethod will continue to be alive. | |
| 379 // It is used when an uncommon trap happens. | |
| 380 void make_not_entrant() { make_not_entrant_or_zombie(not_entrant); } | |
| 381 void make_zombie() { make_not_entrant_or_zombie(zombie); } | |
| 382 | |
| 383 // used by jvmti to track if the unload event has been reported | |
| 384 bool unload_reported() { return _unload_reported; } | |
| 385 void set_unload_reported() { _unload_reported = true; } | |
| 386 | |
| 387 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; } | |
| 388 void mark_for_deoptimization() { _markedForDeoptimization = true; } | |
| 389 | |
| 390 void make_unloaded(BoolObjectClosure* is_alive, oop cause); | |
| 391 | |
| 392 bool has_dependencies() { return dependencies_size() != 0; } | |
| 393 void flush_dependencies(BoolObjectClosure* is_alive); | |
| 394 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; } | |
| 395 void set_has_flushed_dependencies() { | |
| 396 check_safepoint(); | |
| 397 assert(!has_flushed_dependencies(), "should only happen once"); | |
| 398 flags.hasFlushedDependencies = 1; | |
| 399 } | |
| 400 | |
| 401 bool is_marked_for_reclamation() const { return flags.markedForReclamation; } | |
| 402 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; } | |
| 403 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; } | |
| 404 | |
| 405 bool has_unsafe_access() const { return flags.has_unsafe_access; } | |
| 406 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; } | |
| 407 | |
| 408 int level() const { return flags.level; } | |
| 409 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; } | |
| 410 | |
| 411 int comp_level() const { return _comp_level; } | |
| 412 | |
| 413 int version() const { return flags.version; } | |
| 414 void set_version(int v); | |
| 415 | |
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416 // Non-perm oop support |
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417 bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; } |
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418 protected: |
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419 enum { npl_on_list = 0x01, npl_marked = 0x10 }; |
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420 void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; } |
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421 void clear_on_scavenge_root_list() { _scavenge_root_state = 0; } |
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422 // assertion-checking and pruning logic uses the bits of _scavenge_root_state |
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423 #ifndef PRODUCT |
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424 void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; } |
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425 void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; } |
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426 bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; } |
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427 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. |
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428 #endif //PRODUCT |
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429 nmethod* scavenge_root_link() const { return _scavenge_root_link; } |
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430 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } |
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431 |
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432 public: |
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433 |
| 0 | 434 // Sweeper support |
| 435 long stack_traversal_mark() { return _stack_traversal_mark; } | |
| 436 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } | |
| 437 | |
| 438 // Exception cache support | |
| 439 ExceptionCache* exception_cache() const { return _exception_cache; } | |
| 440 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; } | |
| 441 address handler_for_exception_and_pc(Handle exception, address pc); | |
| 442 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler); | |
| 443 void remove_from_exception_cache(ExceptionCache* ec); | |
| 444 | |
| 445 // implicit exceptions support | |
| 446 address continuation_for_implicit_exception(address pc); | |
| 447 | |
| 448 // On-stack replacement support | |
| 449 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; } | |
| 450 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; } | |
| 451 void invalidate_osr_method(); | |
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452 nmethod* osr_link() const { return _osr_link; } |
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453 void set_osr_link(nmethod *n) { _osr_link = n; } |
| 0 | 454 |
| 455 // tells whether frames described by this nmethod can be deoptimized | |
| 456 // note: native wrappers cannot be deoptimized. | |
| 457 bool can_be_deoptimized() const { return is_java_method(); } | |
| 458 | |
| 459 // Inline cache support | |
| 460 void clear_inline_caches(); | |
| 461 void cleanup_inline_caches(); | |
| 462 bool inlinecache_check_contains(address addr) const { | |
| 463 return (addr >= instructions_begin() && addr < verified_entry_point()); | |
| 464 } | |
| 465 | |
| 466 // unlink and deallocate this nmethod | |
| 467 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not | |
| 468 // expected to use any other private methods/data in this class. | |
| 469 | |
| 470 protected: | |
| 471 void flush(); | |
| 472 | |
| 473 public: | |
| 474 // If returning true, it is unsafe to remove this nmethod even though it is a zombie | |
| 475 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. | |
| 476 bool is_locked_by_vm() const { return _lock_count >0; } | |
| 477 | |
| 478 // See comment at definition of _last_seen_on_stack | |
| 479 void mark_as_seen_on_stack(); | |
| 480 bool can_not_entrant_be_converted(); | |
| 481 | |
| 482 // Evolution support. We make old (discarded) compiled methods point to new methodOops. | |
| 483 void set_method(methodOop method) { _method = method; } | |
| 484 | |
| 485 // GC support | |
| 486 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, | |
| 487 bool unloading_occurred); | |
| 488 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive, | |
| 489 oop* root, bool unloading_occurred); | |
| 490 | |
| 491 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, | |
| 492 OopClosure* f); | |
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493 virtual void oops_do(OopClosure* f) { oops_do(f, false); } |
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494 void oops_do(OopClosure* f, bool do_strong_roots_only); |
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495 bool detect_scavenge_root_oops(); |
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496 void verify_scavenge_root_oops() PRODUCT_RETURN; |
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497 |
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498 bool test_set_oops_do_mark(); |
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499 static void oops_do_marking_prologue(); |
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500 static void oops_do_marking_epilogue(); |
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501 static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; } |
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502 DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }) |
| 0 | 503 |
| 504 // ScopeDesc for an instruction | |
| 505 ScopeDesc* scope_desc_at(address pc); | |
| 506 | |
| 507 private: | |
| 508 ScopeDesc* scope_desc_in(address begin, address end); | |
| 509 | |
| 510 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); } | |
| 511 | |
| 512 PcDesc* find_pc_desc_internal(address pc, bool approximate); | |
| 513 | |
| 514 PcDesc* find_pc_desc(address pc, bool approximate) { | |
| 515 PcDesc* desc = _pc_desc_cache.last_pc_desc(); | |
| 516 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) { | |
| 517 return desc; | |
| 518 } | |
| 519 return find_pc_desc_internal(pc, approximate); | |
| 520 } | |
| 521 | |
| 522 public: | |
| 523 // ScopeDesc retrieval operation | |
| 524 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); } | |
| 525 // pc_desc_near returns the first PcDesc at or after the givne pc. | |
| 526 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); } | |
| 527 | |
| 528 public: | |
| 529 // copying of debugging information | |
| 530 void copy_scopes_pcs(PcDesc* pcs, int count); | |
| 531 void copy_scopes_data(address buffer, int size); | |
| 532 | |
| 533 // deopt | |
| 534 // return true is the pc is one would expect if the frame is being deopted. | |
| 535 bool is_deopt_pc(address pc); | |
| 536 // Accessor/mutator for the original pc of a frame before a frame was deopted. | |
| 537 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); } | |
| 538 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; } | |
| 539 | |
| 540 // jvmti support: | |
| 541 void post_compiled_method_load_event(); | |
| 542 | |
| 543 // verify operations | |
| 544 void verify(); | |
| 545 void verify_scopes(); | |
| 546 void verify_interrupt_point(address interrupt_point); | |
| 547 | |
| 548 // printing support | |
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549 void print() const; |
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550 void print_code(); |
| 0 | 551 void print_relocations() PRODUCT_RETURN; |
| 552 void print_pcs() PRODUCT_RETURN; | |
| 553 void print_scopes() PRODUCT_RETURN; | |
| 554 void print_dependencies() PRODUCT_RETURN; | |
| 555 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
| 556 void print_calls(outputStream* st) PRODUCT_RETURN; | |
| 557 void print_handler_table() PRODUCT_RETURN; | |
| 558 void print_nul_chk_table() PRODUCT_RETURN; | |
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559 void print_nmethod(bool print_code); |
| 0 | 560 |
| 561 void print_on(outputStream* st, const char* title) const; | |
| 562 | |
| 563 // Logging | |
| 564 void log_identity(xmlStream* log) const; | |
| 565 void log_new_nmethod() const; | |
| 566 void log_state_change(int state) const; | |
| 567 | |
| 568 // Prints a comment for one native instruction (reloc info, pc desc) | |
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569 void print_code_comment_on(outputStream* st, int column, address begin, address end); |
| 0 | 570 static void print_statistics() PRODUCT_RETURN; |
| 571 | |
| 572 // Compiler task identification. Note that all OSR methods | |
| 573 // are numbered in an independent sequence if CICountOSR is true, | |
| 574 // and native method wrappers are also numbered independently if | |
| 575 // CICountNative is true. | |
| 576 int compile_id() const { return _compile_id; } | |
| 577 const char* compile_kind() const; | |
| 578 | |
| 579 // For debugging | |
| 580 // CompiledIC* IC_at(char* p) const; | |
| 581 // PrimitiveIC* primitiveIC_at(char* p) const; | |
| 582 oop embeddedOop_at(address p); | |
| 583 | |
| 584 // tells if any of this method's dependencies have been invalidated | |
| 585 // (this is expensive!) | |
| 586 bool check_all_dependencies(); | |
| 587 | |
| 588 // tells if this compiled method is dependent on the given changes, | |
| 589 // and the changes have invalidated it | |
| 590 bool check_dependency_on(DepChange& changes); | |
| 591 | |
| 592 // Evolution support. Tells if this compiled method is dependent on any of | |
| 593 // methods m() of class dependee, such that if m() in dependee is replaced, | |
| 594 // this compiled method will have to be deoptimized. | |
| 595 bool is_evol_dependent_on(klassOop dependee); | |
| 596 | |
| 597 // Fast breakpoint support. Tells if this compiled method is | |
| 598 // dependent on the given method. Returns true if this nmethod | |
| 599 // corresponds to the given method as well. | |
| 600 bool is_dependent_on_method(methodOop dependee); | |
| 601 | |
| 602 // is it ok to patch at address? | |
| 603 bool is_patchable_at(address instr_address); | |
| 604 | |
| 605 // UseBiasedLocking support | |
| 606 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() { | |
| 607 return _compiled_synchronized_native_basic_lock_owner_sp_offset; | |
| 608 } | |
| 609 ByteSize compiled_synchronized_native_basic_lock_sp_offset() { | |
| 610 return _compiled_synchronized_native_basic_lock_sp_offset; | |
| 611 } | |
| 612 | |
| 613 // support for code generation | |
| 614 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); } | |
| 615 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } | |
| 616 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } | |
| 617 | |
| 618 }; | |
| 619 | |
| 620 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method | |
| 621 class nmethodLocker : public StackObj { | |
| 622 nmethod* _nm; | |
| 623 | |
| 624 static void lock_nmethod(nmethod* nm); // note: nm can be NULL | |
| 625 static void unlock_nmethod(nmethod* nm); // (ditto) | |
| 626 | |
| 627 public: | |
| 628 nmethodLocker(address pc); // derive nm from pc | |
| 629 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } | |
| 630 nmethodLocker() { _nm = NULL; } | |
| 631 ~nmethodLocker() { unlock_nmethod(_nm); } | |
| 632 | |
| 633 nmethod* code() { return _nm; } | |
| 634 void set_code(nmethod* new_nm) { | |
| 635 unlock_nmethod(_nm); // note: This works even if _nm==new_nm. | |
| 636 _nm = new_nm; | |
| 637 lock_nmethod(_nm); | |
| 638 } | |
| 639 }; |