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src/share/vm/code/nmethod.hpp@98cb887364d3 (annotated)

src/share/vm/code/nmethod.hpp

Fri, 27 Feb 2009 13:27:09 -0800

author
twisti
date
Fri, 27 Feb 2009 13:27:09 -0800
changeset 1040
98cb887364d3
parent 631
d1605aabd0a1
child 1376
8b46c4d82093
child 1424
148e5441d916
permissions
-rw-r--r--

6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

duke@435 1 /*
xdono@631 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
duke@435 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435 21 * have any questions.
duke@435 22 *
duke@435 23 */
duke@435 24
duke@435 25 // This class is used internally by nmethods, to cache
duke@435 26 // exception/pc/handler information.
duke@435 27
duke@435 28 class ExceptionCache : public CHeapObj {
duke@435 29 friend class VMStructs;
duke@435 30 private:
duke@435 31 static address _unwind_handler;
duke@435 32 enum { cache_size = 16 };
duke@435 33 klassOop _exception_type;
duke@435 34 address _pc[cache_size];
duke@435 35 address _handler[cache_size];
duke@435 36 int _count;
duke@435 37 ExceptionCache* _next;
duke@435 38
duke@435 39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
duke@435 40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
duke@435 41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
duke@435 42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
duke@435 43 int count() { return _count; }
duke@435 44 void increment_count() { _count++; }
duke@435 45
duke@435 46 public:
duke@435 47
duke@435 48 ExceptionCache(Handle exception, address pc, address handler);
duke@435 49
duke@435 50 klassOop exception_type() { return _exception_type; }
duke@435 51 klassOop* exception_type_addr() { return &_exception_type; }
duke@435 52 ExceptionCache* next() { return _next; }
duke@435 53 void set_next(ExceptionCache *ec) { _next = ec; }
duke@435 54
duke@435 55 address match(Handle exception, address pc);
duke@435 56 bool match_exception_with_space(Handle exception) ;
duke@435 57 address test_address(address addr);
duke@435 58 bool add_address_and_handler(address addr, address handler) ;
duke@435 59
duke@435 60 static address unwind_handler() { return _unwind_handler; }
duke@435 61 };
duke@435 62
duke@435 63
duke@435 64 // cache pc descs found in earlier inquiries
duke@435 65 class PcDescCache VALUE_OBJ_CLASS_SPEC {
duke@435 66 friend class VMStructs;
duke@435 67 private:
duke@435 68 enum { cache_size = 4 };
duke@435 69 PcDesc* _last_pc_desc; // most recent pc_desc found
duke@435 70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
duke@435 71 public:
duke@435 72 PcDescCache() { debug_only(_last_pc_desc = NULL); }
duke@435 73 void reset_to(PcDesc* initial_pc_desc);
duke@435 74 PcDesc* find_pc_desc(int pc_offset, bool approximate);
duke@435 75 void add_pc_desc(PcDesc* pc_desc);
duke@435 76 PcDesc* last_pc_desc() { return _last_pc_desc; }
duke@435 77 };
duke@435 78
duke@435 79
duke@435 80 // nmethods (native methods) are the compiled code versions of Java methods.
duke@435 81
duke@435 82 struct nmFlags {
duke@435 83 friend class VMStructs;
duke@435 84 unsigned int version:8; // version number (0 = first version)
duke@435 85 unsigned int level:4; // optimization level
duke@435 86 unsigned int age:4; // age (in # of sweep steps)
duke@435 87
duke@435 88 unsigned int state:2; // {alive, zombie, unloaded)
duke@435 89
duke@435 90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
duke@435 91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
duke@435 92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
duke@435 93 unsigned int markedForReclamation:1; // Used by NMethodSweeper
duke@435 94
duke@435 95 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
duke@435 96
duke@435 97 void clear();
duke@435 98 };
duke@435 99
duke@435 100
duke@435 101 // A nmethod contains:
duke@435 102 // - header (the nmethod structure)
duke@435 103 // [Relocation]
duke@435 104 // - relocation information
duke@435 105 // - constant part (doubles, longs and floats used in nmethod)
duke@435 106 // [Code]
duke@435 107 // - code body
duke@435 108 // - exception handler
duke@435 109 // - stub code
duke@435 110 // [Debugging information]
duke@435 111 // - oop array
duke@435 112 // - data array
duke@435 113 // - pcs
duke@435 114 // [Exception handler table]
duke@435 115 // - handler entry point array
duke@435 116 // [Implicit Null Pointer exception table]
duke@435 117 // - implicit null table array
duke@435 118
duke@435 119 class Dependencies;
duke@435 120 class ExceptionHandlerTable;
duke@435 121 class ImplicitExceptionTable;
duke@435 122 class AbstractCompiler;
duke@435 123 class xmlStream;
duke@435 124
duke@435 125 class nmethod : public CodeBlob {
duke@435 126 friend class VMStructs;
duke@435 127 friend class NMethodSweeper;
duke@435 128 private:
duke@435 129 // Shared fields for all nmethod's
duke@435 130 static int _zombie_instruction_size;
duke@435 131
duke@435 132 methodOop _method;
duke@435 133 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
duke@435 134
duke@435 135 nmethod* _link; // To support simple linked-list chaining of nmethods
duke@435 136
duke@435 137 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435 138
duke@435 139 // Offsets for different nmethod parts
duke@435 140 int _exception_offset;
duke@435 141 // All deoptee's will resume execution at this location described by this offset
duke@435 142 int _deoptimize_offset;
kamg@551 143 #ifdef HAVE_DTRACE_H
kamg@551 144 int _trap_offset;
kamg@551 145 #endif // def HAVE_DTRACE_H
duke@435 146 int _stub_offset;
duke@435 147 int _consts_offset;
duke@435 148 int _scopes_data_offset;
duke@435 149 int _scopes_pcs_offset;
duke@435 150 int _dependencies_offset;
duke@435 151 int _handler_table_offset;
duke@435 152 int _nul_chk_table_offset;
duke@435 153 int _nmethod_end_offset;
duke@435 154
duke@435 155 // location in frame (offset for sp) that deopt can store the original
duke@435 156 // pc during a deopt.
duke@435 157 int _orig_pc_offset;
duke@435 158
duke@435 159 int _compile_id; // which compilation made this nmethod
duke@435 160 int _comp_level; // compilation level
duke@435 161
duke@435 162 // offsets for entry points
duke@435 163 address _entry_point; // entry point with class check
duke@435 164 address _verified_entry_point; // entry point without class check
duke@435 165 address _osr_entry_point; // entry point for on stack replacement
duke@435 166
duke@435 167 nmFlags flags; // various flags to keep track of nmethod state
duke@435 168 bool _markedForDeoptimization; // Used for stack deoptimization
duke@435 169 enum { alive = 0,
twisti@1040 170 not_entrant = 1, // uncommon trap has happened but activations may still exist
duke@435 171 zombie = 2,
duke@435 172 unloaded = 3 };
duke@435 173
duke@435 174 // used by jvmti to track if an unload event has been posted for this nmethod.
duke@435 175 bool _unload_reported;
duke@435 176
duke@435 177 NOT_PRODUCT(bool _has_debug_info; )
duke@435 178
duke@435 179 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
duke@435 180 jint _lock_count;
duke@435 181
duke@435 182 // not_entrant method removal. Each mark_sweep pass will update
duke@435 183 // this mark to current sweep invocation count if it is seen on the
duke@435 184 // stack. An not_entrant method can be removed when there is no
duke@435 185 // more activations, i.e., when the _stack_traversal_mark is less than
duke@435 186 // current sweep traversal index.
duke@435 187 long _stack_traversal_mark;
duke@435 188
duke@435 189 ExceptionCache *_exception_cache;
duke@435 190 PcDescCache _pc_desc_cache;
duke@435 191
duke@435 192 // These are only used for compiled synchronized native methods to
duke@435 193 // locate the owner and stack slot for the BasicLock so that we can
duke@435 194 // properly revoke the bias of the owner if necessary. They are
duke@435 195 // needed because there is no debug information for compiled native
duke@435 196 // wrappers and the oop maps are insufficient to allow
duke@435 197 // frame::retrieve_receiver() to work. Currently they are expected
duke@435 198 // to be byte offsets from the Java stack pointer for maximum code
duke@435 199 // sharing between platforms. Note that currently biased locking
duke@435 200 // will never cause Class instances to be biased but this code
duke@435 201 // handles the static synchronized case as well.
duke@435 202 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435 203 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
duke@435 204
duke@435 205 friend class nmethodLocker;
duke@435 206
duke@435 207 // For native wrappers
duke@435 208 nmethod(methodOop method,
duke@435 209 int nmethod_size,
duke@435 210 CodeOffsets* offsets,
duke@435 211 CodeBuffer *code_buffer,
duke@435 212 int frame_size,
duke@435 213 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435 214 ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435 215 OopMapSet* oop_maps);
duke@435 216
kamg@551 217 #ifdef HAVE_DTRACE_H
kamg@551 218 // For native wrappers
kamg@551 219 nmethod(methodOop method,
kamg@551 220 int nmethod_size,
kamg@551 221 CodeOffsets* offsets,
kamg@551 222 CodeBuffer *code_buffer,
kamg@551 223 int frame_size);
kamg@551 224 #endif // def HAVE_DTRACE_H
kamg@551 225
duke@435 226 // Creation support
duke@435 227 nmethod(methodOop method,
duke@435 228 int nmethod_size,
duke@435 229 int compile_id,
duke@435 230 int entry_bci,
duke@435 231 CodeOffsets* offsets,
duke@435 232 int orig_pc_offset,
duke@435 233 DebugInformationRecorder *recorder,
duke@435 234 Dependencies* dependencies,
duke@435 235 CodeBuffer *code_buffer,
duke@435 236 int frame_size,
duke@435 237 OopMapSet* oop_maps,
duke@435 238 ExceptionHandlerTable* handler_table,
duke@435 239 ImplicitExceptionTable* nul_chk_table,
duke@435 240 AbstractCompiler* compiler,
duke@435 241 int comp_level);
duke@435 242
duke@435 243 // helper methods
duke@435 244 void* operator new(size_t size, int nmethod_size);
duke@435 245 void check_store();
duke@435 246
duke@435 247 const char* reloc_string_for(u_char* begin, u_char* end);
duke@435 248 void make_not_entrant_or_zombie(int state);
duke@435 249 void inc_decompile_count();
duke@435 250
duke@435 251 // used to check that writes to nmFlags are done consistently.
duke@435 252 static void check_safepoint() PRODUCT_RETURN;
duke@435 253
duke@435 254 // Used to manipulate the exception cache
duke@435 255 void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435 256 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435 257
duke@435 258 // Inform external interfaces that a compiled method has been unloaded
duke@435 259 inline void post_compiled_method_unload();
duke@435 260
duke@435 261 public:
duke@435 262 // create nmethod with entry_bci
duke@435 263 static nmethod* new_nmethod(methodHandle method,
duke@435 264 int compile_id,
duke@435 265 int entry_bci,
duke@435 266 CodeOffsets* offsets,
duke@435 267 int orig_pc_offset,
duke@435 268 DebugInformationRecorder* recorder,
duke@435 269 Dependencies* dependencies,
duke@435 270 CodeBuffer *code_buffer,
duke@435 271 int frame_size,
duke@435 272 OopMapSet* oop_maps,
duke@435 273 ExceptionHandlerTable* handler_table,
duke@435 274 ImplicitExceptionTable* nul_chk_table,
duke@435 275 AbstractCompiler* compiler,
duke@435 276 int comp_level);
duke@435 277
duke@435 278 static nmethod* new_native_nmethod(methodHandle method,
duke@435 279 CodeBuffer *code_buffer,
duke@435 280 int vep_offset,
duke@435 281 int frame_complete,
duke@435 282 int frame_size,
duke@435 283 ByteSize receiver_sp_offset,
duke@435 284 ByteSize basic_lock_sp_offset,
duke@435 285 OopMapSet* oop_maps);
duke@435 286
kamg@551 287 #ifdef HAVE_DTRACE_H
kamg@551 288 // The method we generate for a dtrace probe has to look
kamg@551 289 // like an nmethod as far as the rest of the system is concerned
kamg@551 290 // which is somewhat unfortunate.
kamg@551 291 static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551 292 CodeBuffer *code_buffer,
kamg@551 293 int vep_offset,
kamg@551 294 int trap_offset,
kamg@551 295 int frame_complete,
kamg@551 296 int frame_size);
kamg@551 297
kamg@551 298 int trap_offset() const { return _trap_offset; }
kamg@551 299 address trap_address() const { return code_begin() + _trap_offset; }
kamg@551 300
kamg@551 301 #endif // def HAVE_DTRACE_H
kamg@551 302
duke@435 303 // accessors
duke@435 304 methodOop method() const { return _method; }
duke@435 305 AbstractCompiler* compiler() const { return _compiler; }
duke@435 306
duke@435 307 #ifndef PRODUCT
duke@435 308 bool has_debug_info() const { return _has_debug_info; }
duke@435 309 void set_has_debug_info(bool f) { _has_debug_info = false; }
duke@435 310 #endif // NOT PRODUCT
duke@435 311
duke@435 312 // type info
duke@435 313 bool is_nmethod() const { return true; }
duke@435 314 bool is_java_method() const { return !method()->is_native(); }
duke@435 315 bool is_native_method() const { return method()->is_native(); }
duke@435 316 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435 317 bool is_osr_only_method() const { return is_osr_method(); }
duke@435 318
duke@435 319 bool is_compiled_by_c1() const;
duke@435 320 bool is_compiled_by_c2() const;
duke@435 321
duke@435 322 // boundaries for different parts
duke@435 323 address code_begin () const { return _entry_point; }
duke@435 324 address code_end () const { return header_begin() + _stub_offset ; }
duke@435 325 address exception_begin () const { return header_begin() + _exception_offset ; }
duke@435 326 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; }
duke@435 327 address stub_begin () const { return header_begin() + _stub_offset ; }
duke@435 328 address stub_end () const { return header_begin() + _consts_offset ; }
duke@435 329 address consts_begin () const { return header_begin() + _consts_offset ; }
duke@435 330 address consts_end () const { return header_begin() + _scopes_data_offset ; }
duke@435 331 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
duke@435 332 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
duke@435 333 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
duke@435 334 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); }
duke@435 335 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
duke@435 336 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
duke@435 337 address handler_table_begin() const { return header_begin() + _handler_table_offset ; }
duke@435 338 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
duke@435 339 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; }
duke@435 340 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435 341
duke@435 342 int code_size () const { return code_end () - code_begin (); }
duke@435 343 int stub_size () const { return stub_end () - stub_begin (); }
duke@435 344 int consts_size () const { return consts_end () - consts_begin (); }
duke@435 345 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
duke@435 346 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
duke@435 347 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
duke@435 348 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
duke@435 349 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435 350
duke@435 351 int total_size () const;
duke@435 352
duke@435 353 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
duke@435 354 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
duke@435 355 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
duke@435 356 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435 357 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435 358 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435 359 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435 360
duke@435 361 // entry points
duke@435 362 address entry_point() const { return _entry_point; } // normal entry point
duke@435 363 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435 364
duke@435 365 // flag accessing and manipulation
duke@435 366 bool is_in_use() const { return flags.state == alive; }
duke@435 367 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
duke@435 368 bool is_not_entrant() const { return flags.state == not_entrant; }
duke@435 369 bool is_zombie() const { return flags.state == zombie; }
duke@435 370 bool is_unloaded() const { return flags.state == unloaded; }
duke@435 371
duke@435 372 // Make the nmethod non entrant. The nmethod will continue to be alive.
duke@435 373 // It is used when an uncommon trap happens.
duke@435 374 void make_not_entrant() { make_not_entrant_or_zombie(not_entrant); }
duke@435 375 void make_zombie() { make_not_entrant_or_zombie(zombie); }
duke@435 376
duke@435 377 // used by jvmti to track if the unload event has been reported
duke@435 378 bool unload_reported() { return _unload_reported; }
duke@435 379 void set_unload_reported() { _unload_reported = true; }
duke@435 380
duke@435 381 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
duke@435 382 void mark_for_deoptimization() { _markedForDeoptimization = true; }
duke@435 383
duke@435 384 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435 385
duke@435 386 bool has_dependencies() { return dependencies_size() != 0; }
duke@435 387 void flush_dependencies(BoolObjectClosure* is_alive);
duke@435 388 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
duke@435 389 void set_has_flushed_dependencies() {
duke@435 390 check_safepoint();
duke@435 391 assert(!has_flushed_dependencies(), "should only happen once");
duke@435 392 flags.hasFlushedDependencies = 1;
duke@435 393 }
duke@435 394
duke@435 395 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
duke@435 396 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
duke@435 397 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
duke@435 398
duke@435 399 bool has_unsafe_access() const { return flags.has_unsafe_access; }
duke@435 400 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
duke@435 401
duke@435 402 int level() const { return flags.level; }
duke@435 403 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
duke@435 404
duke@435 405 int comp_level() const { return _comp_level; }
duke@435 406
duke@435 407 int version() const { return flags.version; }
duke@435 408 void set_version(int v);
duke@435 409
duke@435 410 // Sweeper support
duke@435 411 long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435 412 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435 413
duke@435 414 // Exception cache support
duke@435 415 ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435 416 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435 417 address handler_for_exception_and_pc(Handle exception, address pc);
duke@435 418 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435 419 void remove_from_exception_cache(ExceptionCache* ec);
duke@435 420
duke@435 421 // implicit exceptions support
duke@435 422 address continuation_for_implicit_exception(address pc);
duke@435 423
duke@435 424 // On-stack replacement support
duke@435 425 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
duke@435 426 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
duke@435 427 void invalidate_osr_method();
duke@435 428 nmethod* link() const { return _link; }
duke@435 429 void set_link(nmethod *n) { _link = n; }
duke@435 430
duke@435 431 // tells whether frames described by this nmethod can be deoptimized
duke@435 432 // note: native wrappers cannot be deoptimized.
duke@435 433 bool can_be_deoptimized() const { return is_java_method(); }
duke@435 434
duke@435 435 // Inline cache support
duke@435 436 void clear_inline_caches();
duke@435 437 void cleanup_inline_caches();
duke@435 438 bool inlinecache_check_contains(address addr) const {
duke@435 439 return (addr >= instructions_begin() && addr < verified_entry_point());
duke@435 440 }
duke@435 441
duke@435 442 // unlink and deallocate this nmethod
duke@435 443 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435 444 // expected to use any other private methods/data in this class.
duke@435 445
duke@435 446 protected:
duke@435 447 void flush();
duke@435 448
duke@435 449 public:
duke@435 450 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
duke@435 451 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
duke@435 452 bool is_locked_by_vm() const { return _lock_count >0; }
duke@435 453
duke@435 454 // See comment at definition of _last_seen_on_stack
duke@435 455 void mark_as_seen_on_stack();
duke@435 456 bool can_not_entrant_be_converted();
duke@435 457
duke@435 458 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
duke@435 459 void set_method(methodOop method) { _method = method; }
duke@435 460
duke@435 461 // GC support
duke@435 462 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435 463 bool unloading_occurred);
duke@435 464 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435 465 oop* root, bool unloading_occurred);
duke@435 466
duke@435 467 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435 468 OopClosure* f);
duke@435 469 void oops_do(OopClosure* f);
duke@435 470
duke@435 471 // ScopeDesc for an instruction
duke@435 472 ScopeDesc* scope_desc_at(address pc);
duke@435 473
duke@435 474 private:
duke@435 475 ScopeDesc* scope_desc_in(address begin, address end);
duke@435 476
duke@435 477 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435 478
duke@435 479 PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435 480
duke@435 481 PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435 482 PcDesc* desc = _pc_desc_cache.last_pc_desc();
duke@435 483 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
duke@435 484 return desc;
duke@435 485 }
duke@435 486 return find_pc_desc_internal(pc, approximate);
duke@435 487 }
duke@435 488
duke@435 489 public:
duke@435 490 // ScopeDesc retrieval operation
duke@435 491 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435 492 // pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435 493 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435 494
duke@435 495 public:
duke@435 496 // copying of debugging information
duke@435 497 void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435 498 void copy_scopes_data(address buffer, int size);
duke@435 499
duke@435 500 // deopt
duke@435 501 // return true is the pc is one would expect if the frame is being deopted.
duke@435 502 bool is_deopt_pc(address pc);
duke@435 503 // Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435 504 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435 505 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435 506
duke@435 507 // jvmti support:
duke@435 508 void post_compiled_method_load_event();
duke@435 509
duke@435 510 // verify operations
duke@435 511 void verify();
duke@435 512 void verify_scopes();
duke@435 513 void verify_interrupt_point(address interrupt_point);
duke@435 514
duke@435 515 // printing support
jrose@535 516 void print() const;
jrose@535 517 void print_code();
duke@435 518 void print_relocations() PRODUCT_RETURN;
duke@435 519 void print_pcs() PRODUCT_RETURN;
duke@435 520 void print_scopes() PRODUCT_RETURN;
duke@435 521 void print_dependencies() PRODUCT_RETURN;
duke@435 522 void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435 523 void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435 524 void print_handler_table() PRODUCT_RETURN;
duke@435 525 void print_nul_chk_table() PRODUCT_RETURN;
jrose@535 526 void print_nmethod(bool print_code);
duke@435 527
duke@435 528 void print_on(outputStream* st, const char* title) const;
duke@435 529
duke@435 530 // Logging
duke@435 531 void log_identity(xmlStream* log) const;
duke@435 532 void log_new_nmethod() const;
duke@435 533 void log_state_change(int state) const;
duke@435 534
duke@435 535 // Prints a comment for one native instruction (reloc info, pc desc)
jrose@535 536 void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435 537 static void print_statistics() PRODUCT_RETURN;
duke@435 538
duke@435 539 // Compiler task identification. Note that all OSR methods
duke@435 540 // are numbered in an independent sequence if CICountOSR is true,
duke@435 541 // and native method wrappers are also numbered independently if
duke@435 542 // CICountNative is true.
duke@435 543 int compile_id() const { return _compile_id; }
duke@435 544 const char* compile_kind() const;
duke@435 545
duke@435 546 // For debugging
duke@435 547 // CompiledIC* IC_at(char* p) const;
duke@435 548 // PrimitiveIC* primitiveIC_at(char* p) const;
duke@435 549 oop embeddedOop_at(address p);
duke@435 550
duke@435 551 // tells if any of this method's dependencies have been invalidated
duke@435 552 // (this is expensive!)
duke@435 553 bool check_all_dependencies();
duke@435 554
duke@435 555 // tells if this compiled method is dependent on the given changes,
duke@435 556 // and the changes have invalidated it
duke@435 557 bool check_dependency_on(DepChange& changes);
duke@435 558
duke@435 559 // Evolution support. Tells if this compiled method is dependent on any of
duke@435 560 // methods m() of class dependee, such that if m() in dependee is replaced,
duke@435 561 // this compiled method will have to be deoptimized.
duke@435 562 bool is_evol_dependent_on(klassOop dependee);
duke@435 563
duke@435 564 // Fast breakpoint support. Tells if this compiled method is
duke@435 565 // dependent on the given method. Returns true if this nmethod
duke@435 566 // corresponds to the given method as well.
duke@435 567 bool is_dependent_on_method(methodOop dependee);
duke@435 568
duke@435 569 // is it ok to patch at address?
duke@435 570 bool is_patchable_at(address instr_address);
duke@435 571
duke@435 572 // UseBiasedLocking support
duke@435 573 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
duke@435 574 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435 575 }
duke@435 576 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
duke@435 577 return _compiled_synchronized_native_basic_lock_sp_offset;
duke@435 578 }
duke@435 579
duke@435 580 // support for code generation
duke@435 581 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435 582 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435 583 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435 584
duke@435 585 };
duke@435 586
duke@435 587 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
duke@435 588 class nmethodLocker : public StackObj {
duke@435 589 nmethod* _nm;
duke@435 590
duke@435 591 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
duke@435 592 static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435 593
duke@435 594 public:
duke@435 595 nmethodLocker(address pc); // derive nm from pc
duke@435 596 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435 597 nmethodLocker() { _nm = NULL; }
duke@435 598 ~nmethodLocker() { unlock_nmethod(_nm); }
duke@435 599
duke@435 600 nmethod* code() { return _nm; }
duke@435 601 void set_code(nmethod* new_nm) {
duke@435 602 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435 603 _nm = new_nm;
duke@435 604 lock_nmethod(_nm);
duke@435 605 }
duke@435 606 };

Mercurial Repository: jdk8-mips64-public/hotspot

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