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src/share/vm/code/nmethod.hpp@bfe29ec02863 (annotated)

src/share/vm/code/nmethod.hpp

Mon, 17 May 2010 16:50:07 -0700

author

never

date

Mon, 17 May 2010 16:50:07 -0700

changeset 1893

bfe29ec02863

parent 1813

9f5b60a14736

child 1907

c18cbe5936b8

child 1918

1a5913bf5e19

permissions

-rw-r--r--

6950075: nmethod sweeper should operate concurrently
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com

duke@435	1	/*
twisti@1639	2	* Copyright 1997-2010 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;
twisti@1570	84	unsigned int version:8; // version number (0 = first version)
twisti@1570	85	unsigned int age:4; // age (in # of sweep steps)
duke@435	86
twisti@1570	87	unsigned int state:2; // {alive, zombie, unloaded)
duke@435	88
twisti@1570	89	unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
twisti@1570	90	unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
twisti@1570	91	unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
twisti@1570	92	unsigned int markedForReclamation:1; // Used by NMethodSweeper
duke@435	93
twisti@1570	94	unsigned int has_unsafe_access:1; // May fault due to unsafe access.
twisti@1570	95	unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
duke@435	96
kvn@1637	97	unsigned int speculatively_disconnected:1; // Marked for potential unload
kvn@1637	98
duke@435	99	void clear();
duke@435	100	};
duke@435	101
duke@435	102
duke@435	103	// A nmethod contains:
duke@435	104	// - header (the nmethod structure)
duke@435	105	// [Relocation]
duke@435	106	// - relocation information
duke@435	107	// - constant part (doubles, longs and floats used in nmethod)
duke@435	108	// [Code]
duke@435	109	// - code body
duke@435	110	// - exception handler
duke@435	111	// - stub code
duke@435	112	// [Debugging information]
duke@435	113	// - oop array
duke@435	114	// - data array
duke@435	115	// - pcs
duke@435	116	// [Exception handler table]
duke@435	117	// - handler entry point array
duke@435	118	// [Implicit Null Pointer exception table]
duke@435	119	// - implicit null table array
duke@435	120
duke@435	121	class Dependencies;
duke@435	122	class ExceptionHandlerTable;
duke@435	123	class ImplicitExceptionTable;
duke@435	124	class AbstractCompiler;
duke@435	125	class xmlStream;
duke@435	126
duke@435	127	class nmethod : public CodeBlob {
duke@435	128	friend class VMStructs;
duke@435	129	friend class NMethodSweeper;
jrose@1424	130	friend class CodeCache; // non-perm oops
duke@435	131	private:
duke@435	132	// Shared fields for all nmethod's
duke@435	133	static int _zombie_instruction_size;
duke@435	134
duke@435	135	methodOop _method;
duke@435	136	int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
duke@435	137
jrose@1424	138	// To support simple linked-list chaining of nmethods:
jrose@1424	139	nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
jrose@1424	140	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
kvn@1637	141	nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
jrose@1424	142
jrose@1424	143	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	144	nmethod* volatile _oops_do_mark_link;
duke@435	145
duke@435	146	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	147
duke@435	148	// Offsets for different nmethod parts
duke@435	149	int _exception_offset;
twisti@1639	150	// All deoptee's will resume execution at this location described by
twisti@1639	151	// this offset.
duke@435	152	int _deoptimize_offset;
twisti@1639	153	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	154	// at this location described by this offset.
twisti@1639	155	int _deoptimize_mh_offset;
never@1813	156	// Offset of the unwind handler if it exists
never@1813	157	int _unwind_handler_offset;
never@1813	158
kamg@551	159	#ifdef HAVE_DTRACE_H
kamg@551	160	int _trap_offset;
kamg@551	161	#endif // def HAVE_DTRACE_H
duke@435	162	int _stub_offset;
duke@435	163	int _consts_offset;
duke@435	164	int _scopes_data_offset;
duke@435	165	int _scopes_pcs_offset;
duke@435	166	int _dependencies_offset;
duke@435	167	int _handler_table_offset;
duke@435	168	int _nul_chk_table_offset;
duke@435	169	int _nmethod_end_offset;
duke@435	170
duke@435	171	// location in frame (offset for sp) that deopt can store the original
duke@435	172	// pc during a deopt.
duke@435	173	int _orig_pc_offset;
duke@435	174
duke@435	175	int _compile_id; // which compilation made this nmethod
duke@435	176	int _comp_level; // compilation level
duke@435	177
duke@435	178	// offsets for entry points
duke@435	179	address _entry_point; // entry point with class check
duke@435	180	address _verified_entry_point; // entry point without class check
duke@435	181	address _osr_entry_point; // entry point for on stack replacement
duke@435	182
duke@435	183	nmFlags flags; // various flags to keep track of nmethod state
duke@435	184	bool _markedForDeoptimization; // Used for stack deoptimization
duke@435	185	enum { alive = 0,
twisti@1040	186	not_entrant = 1, // uncommon trap has happened but activations may still exist
duke@435	187	zombie = 2,
duke@435	188	unloaded = 3 };
duke@435	189
duke@435	190	// used by jvmti to track if an unload event has been posted for this nmethod.
duke@435	191	bool _unload_reported;
duke@435	192
jrose@1424	193	jbyte _scavenge_root_state;
jrose@1424	194
duke@435	195	NOT_PRODUCT(bool _has_debug_info; )
duke@435	196
duke@435	197	// Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
duke@435	198	jint _lock_count;
duke@435	199
duke@435	200	// not_entrant method removal. Each mark_sweep pass will update
duke@435	201	// this mark to current sweep invocation count if it is seen on the
duke@435	202	// stack. An not_entrant method can be removed when there is no
duke@435	203	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	204	// current sweep traversal index.
duke@435	205	long _stack_traversal_mark;
duke@435	206
duke@435	207	ExceptionCache *_exception_cache;
duke@435	208	PcDescCache _pc_desc_cache;
duke@435	209
duke@435	210	// These are only used for compiled synchronized native methods to
duke@435	211	// locate the owner and stack slot for the BasicLock so that we can
duke@435	212	// properly revoke the bias of the owner if necessary. They are
duke@435	213	// needed because there is no debug information for compiled native
duke@435	214	// wrappers and the oop maps are insufficient to allow
duke@435	215	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	216	// to be byte offsets from the Java stack pointer for maximum code
duke@435	217	// sharing between platforms. Note that currently biased locking
duke@435	218	// will never cause Class instances to be biased but this code
duke@435	219	// handles the static synchronized case as well.
duke@435	220	ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435	221	ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
duke@435	222
duke@435	223	friend class nmethodLocker;
duke@435	224
duke@435	225	// For native wrappers
duke@435	226	nmethod(methodOop method,
duke@435	227	int nmethod_size,
duke@435	228	CodeOffsets* offsets,
duke@435	229	CodeBuffer *code_buffer,
duke@435	230	int frame_size,
duke@435	231	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	232	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	233	OopMapSet* oop_maps);
duke@435	234
kamg@551	235	#ifdef HAVE_DTRACE_H
kamg@551	236	// For native wrappers
kamg@551	237	nmethod(methodOop method,
kamg@551	238	int nmethod_size,
kamg@551	239	CodeOffsets* offsets,
kamg@551	240	CodeBuffer *code_buffer,
kamg@551	241	int frame_size);
kamg@551	242	#endif // def HAVE_DTRACE_H
kamg@551	243
duke@435	244	// Creation support
duke@435	245	nmethod(methodOop method,
duke@435	246	int nmethod_size,
duke@435	247	int compile_id,
duke@435	248	int entry_bci,
duke@435	249	CodeOffsets* offsets,
duke@435	250	int orig_pc_offset,
duke@435	251	DebugInformationRecorder *recorder,
duke@435	252	Dependencies* dependencies,
duke@435	253	CodeBuffer *code_buffer,
duke@435	254	int frame_size,
duke@435	255	OopMapSet* oop_maps,
duke@435	256	ExceptionHandlerTable* handler_table,
duke@435	257	ImplicitExceptionTable* nul_chk_table,
duke@435	258	AbstractCompiler* compiler,
duke@435	259	int comp_level);
duke@435	260
duke@435	261	// helper methods
duke@435	262	void* operator new(size_t size, int nmethod_size);
duke@435	263
duke@435	264	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	265	// Returns true if this thread changed the state of the nmethod or
never@1544	266	// false if another thread performed the transition.
never@1576	267	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	268	void inc_decompile_count();
duke@435	269
duke@435	270	// used to check that writes to nmFlags are done consistently.
duke@435	271	static void check_safepoint() PRODUCT_RETURN;
duke@435	272
duke@435	273	// Used to manipulate the exception cache
duke@435	274	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	275	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	276
duke@435	277	// Inform external interfaces that a compiled method has been unloaded
duke@435	278	inline void post_compiled_method_unload();
duke@435	279
duke@435	280	public:
duke@435	281	// create nmethod with entry_bci
duke@435	282	static nmethod* new_nmethod(methodHandle method,
duke@435	283	int compile_id,
duke@435	284	int entry_bci,
duke@435	285	CodeOffsets* offsets,
duke@435	286	int orig_pc_offset,
duke@435	287	DebugInformationRecorder* recorder,
duke@435	288	Dependencies* dependencies,
duke@435	289	CodeBuffer *code_buffer,
duke@435	290	int frame_size,
duke@435	291	OopMapSet* oop_maps,
duke@435	292	ExceptionHandlerTable* handler_table,
duke@435	293	ImplicitExceptionTable* nul_chk_table,
duke@435	294	AbstractCompiler* compiler,
duke@435	295	int comp_level);
duke@435	296
duke@435	297	static nmethod* new_native_nmethod(methodHandle method,
duke@435	298	CodeBuffer *code_buffer,
duke@435	299	int vep_offset,
duke@435	300	int frame_complete,
duke@435	301	int frame_size,
duke@435	302	ByteSize receiver_sp_offset,
duke@435	303	ByteSize basic_lock_sp_offset,
duke@435	304	OopMapSet* oop_maps);
duke@435	305
kamg@551	306	#ifdef HAVE_DTRACE_H
kamg@551	307	// The method we generate for a dtrace probe has to look
kamg@551	308	// like an nmethod as far as the rest of the system is concerned
kamg@551	309	// which is somewhat unfortunate.
kamg@551	310	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	311	CodeBuffer *code_buffer,
kamg@551	312	int vep_offset,
kamg@551	313	int trap_offset,
kamg@551	314	int frame_complete,
kamg@551	315	int frame_size);
kamg@551	316
kamg@551	317	int trap_offset() const { return _trap_offset; }
kamg@551	318	address trap_address() const { return code_begin() + _trap_offset; }
kamg@551	319
kamg@551	320	#endif // def HAVE_DTRACE_H
kamg@551	321
duke@435	322	// accessors
duke@435	323	methodOop method() const { return _method; }
duke@435	324	AbstractCompiler* compiler() const { return _compiler; }
duke@435	325
duke@435	326	#ifndef PRODUCT
duke@435	327	bool has_debug_info() const { return _has_debug_info; }
duke@435	328	void set_has_debug_info(bool f) { _has_debug_info = false; }
duke@435	329	#endif // NOT PRODUCT
duke@435	330
duke@435	331	// type info
duke@435	332	bool is_nmethod() const { return true; }
duke@435	333	bool is_java_method() const { return !method()->is_native(); }
duke@435	334	bool is_native_method() const { return method()->is_native(); }
duke@435	335	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	336
duke@435	337	bool is_compiled_by_c1() const;
duke@435	338	bool is_compiled_by_c2() const;
duke@435	339
duke@435	340	// boundaries for different parts
twisti@1639	341	address code_begin () const { return _entry_point; }
twisti@1639	342	address code_end () const { return header_begin() + _stub_offset ; }
twisti@1639	343	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	344	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	345	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	346	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1639	347	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@1639	348	address stub_end () const { return header_begin() + _consts_offset ; }
twisti@1639	349	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@1639	350	address consts_end () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	351	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	352	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	353	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	354	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	355	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	356	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	357	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	358	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	359	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	360	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	361
duke@435	362	int code_size () const { return code_end () - code_begin (); }
duke@435	363	int stub_size () const { return stub_end () - stub_begin (); }
duke@435	364	int consts_size () const { return consts_end () - consts_begin (); }
duke@435	365	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
duke@435	366	int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
duke@435	367	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
duke@435	368	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
duke@435	369	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	370
duke@435	371	int total_size () const;
duke@435	372
duke@435	373	bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
duke@435	374	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
duke@435	375	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
duke@435	376	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	377	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	378	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	379	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	380
duke@435	381	// entry points
duke@435	382	address entry_point() const { return _entry_point; } // normal entry point
duke@435	383	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	384
duke@435	385	// flag accessing and manipulation
duke@435	386	bool is_in_use() const { return flags.state == alive; }
duke@435	387	bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
duke@435	388	bool is_not_entrant() const { return flags.state == not_entrant; }
duke@435	389	bool is_zombie() const { return flags.state == zombie; }
duke@435	390	bool is_unloaded() const { return flags.state == unloaded; }
duke@435	391
never@1544	392	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	393	// alive. It is used when an uncommon trap happens. Returns true
never@1544	394	// if this thread changed the state of the nmethod or false if
never@1544	395	// another thread performed the transition.
never@1544	396	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
never@1544	397	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	398
duke@435	399	// used by jvmti to track if the unload event has been reported
duke@435	400	bool unload_reported() { return _unload_reported; }
duke@435	401	void set_unload_reported() { _unload_reported = true; }
duke@435	402
duke@435	403	bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
duke@435	404	void mark_for_deoptimization() { _markedForDeoptimization = true; }
duke@435	405
duke@435	406	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	407
duke@435	408	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	409	void flush_dependencies(BoolObjectClosure* is_alive);
duke@435	410	bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
duke@435	411	void set_has_flushed_dependencies() {
duke@435	412	assert(!has_flushed_dependencies(), "should only happen once");
duke@435	413	flags.hasFlushedDependencies = 1;
duke@435	414	}
duke@435	415
duke@435	416	bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
never@1893	417	void mark_for_reclamation() { flags.markedForReclamation = 1; }
never@1893	418	void unmark_for_reclamation() { flags.markedForReclamation = 0; }
duke@435	419
duke@435	420	bool has_unsafe_access() const { return flags.has_unsafe_access; }
duke@435	421	void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
duke@435	422
twisti@1570	423	bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
twisti@1570	424	void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
twisti@1570	425
kvn@1637	426	bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
kvn@1637	427	void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
kvn@1637	428
duke@435	429	int comp_level() const { return _comp_level; }
duke@435	430
duke@435	431	int version() const { return flags.version; }
duke@435	432	void set_version(int v);
duke@435	433
jrose@1424	434	// Non-perm oop support
jrose@1424	435	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	436	protected:
jrose@1424	437	enum { npl_on_list = 0x01, npl_marked = 0x10 };
jrose@1424	438	void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
jrose@1424	439	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	440	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	441	#ifndef PRODUCT
jrose@1424	442	void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
jrose@1424	443	void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
jrose@1424	444	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
jrose@1424	445	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	446	#endif //PRODUCT
jrose@1424	447	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	448	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	449
kvn@1637	450	nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
kvn@1637	451	void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
kvn@1637	452
jrose@1424	453	public:
jrose@1424	454
duke@435	455	// Sweeper support
duke@435	456	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	457	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	458
duke@435	459	// Exception cache support
duke@435	460	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	461	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	462	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	463	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435	464	void remove_from_exception_cache(ExceptionCache* ec);
duke@435	465
duke@435	466	// implicit exceptions support
duke@435	467	address continuation_for_implicit_exception(address pc);
duke@435	468
duke@435	469	// On-stack replacement support
duke@435	470	int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
duke@435	471	address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	472	void invalidate_osr_method();
jrose@1424	473	nmethod* osr_link() const { return _osr_link; }
jrose@1424	474	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	475
duke@435	476	// tells whether frames described by this nmethod can be deoptimized
duke@435	477	// note: native wrappers cannot be deoptimized.
duke@435	478	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	479
duke@435	480	// Inline cache support
duke@435	481	void clear_inline_caches();
duke@435	482	void cleanup_inline_caches();
duke@435	483	bool inlinecache_check_contains(address addr) const {
duke@435	484	return (addr >= instructions_begin() && addr < verified_entry_point());
duke@435	485	}
duke@435	486
duke@435	487	// unlink and deallocate this nmethod
duke@435	488	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	489	// expected to use any other private methods/data in this class.
duke@435	490
duke@435	491	protected:
duke@435	492	void flush();
duke@435	493
duke@435	494	public:
duke@435	495	// If returning true, it is unsafe to remove this nmethod even though it is a zombie
duke@435	496	// nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
duke@435	497	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	498
duke@435	499	// See comment at definition of _last_seen_on_stack
duke@435	500	void mark_as_seen_on_stack();
duke@435	501	bool can_not_entrant_be_converted();
duke@435	502
duke@435	503	// Evolution support. We make old (discarded) compiled methods point to new methodOops.
duke@435	504	void set_method(methodOop method) { _method = method; }
duke@435	505
duke@435	506	// GC support
duke@435	507	void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	508	bool unloading_occurred);
duke@435	509	bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	510	oop* root, bool unloading_occurred);
duke@435	511
duke@435	512	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	513	OopClosure* f);
jrose@1429	514	virtual void oops_do(OopClosure* f) { oops_do(f, false); }
jrose@1429	515	void oops_do(OopClosure* f, bool do_strong_roots_only);
jrose@1424	516	bool detect_scavenge_root_oops();
jrose@1424	517	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	518
jrose@1424	519	bool test_set_oops_do_mark();
jrose@1424	520	static void oops_do_marking_prologue();
jrose@1424	521	static void oops_do_marking_epilogue();
jrose@1424	522	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
jrose@1424	523	DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
duke@435	524
duke@435	525	// ScopeDesc for an instruction
duke@435	526	ScopeDesc* scope_desc_at(address pc);
duke@435	527
duke@435	528	private:
duke@435	529	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	530
twisti@1639	531	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	532
duke@435	533	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	534
duke@435	535	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	536	PcDesc* desc = _pc_desc_cache.last_pc_desc();
duke@435	537	if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
duke@435	538	return desc;
duke@435	539	}
duke@435	540	return find_pc_desc_internal(pc, approximate);
duke@435	541	}
duke@435	542
duke@435	543	public:
duke@435	544	// ScopeDesc retrieval operation
duke@435	545	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	546	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	547	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	548
duke@435	549	public:
duke@435	550	// copying of debugging information
duke@435	551	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	552	void copy_scopes_data(address buffer, int size);
duke@435	553
twisti@1639	554	// Deopt
twisti@1639	555	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	556	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	557	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	558	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	559	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	560	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	561	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	562
twisti@1639	563	static address get_deopt_original_pc(const frame* fr);
twisti@1639	564
twisti@1570	565	// MethodHandle
twisti@1570	566	bool is_method_handle_return(address return_pc);
twisti@1570	567
duke@435	568	// jvmti support:
duke@435	569	void post_compiled_method_load_event();
duke@435	570
duke@435	571	// verify operations
duke@435	572	void verify();
duke@435	573	void verify_scopes();
duke@435	574	void verify_interrupt_point(address interrupt_point);
duke@435	575
duke@435	576	// printing support
jrose@535	577	void print() const;
jrose@535	578	void print_code();
duke@435	579	void print_relocations() PRODUCT_RETURN;
duke@435	580	void print_pcs() PRODUCT_RETURN;
duke@435	581	void print_scopes() PRODUCT_RETURN;
duke@435	582	void print_dependencies() PRODUCT_RETURN;
duke@435	583	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	584	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	585	void print_handler_table() PRODUCT_RETURN;
duke@435	586	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	587	void print_nmethod(bool print_code);
duke@435	588
duke@435	589	void print_on(outputStream* st, const char* title) const;
duke@435	590
duke@435	591	// Logging
duke@435	592	void log_identity(xmlStream* log) const;
duke@435	593	void log_new_nmethod() const;
never@1544	594	void log_state_change() const;
duke@435	595
jrose@1590	596	// Prints block-level comments, including nmethod specific block labels:
jrose@1590	597	virtual void print_block_comment(outputStream* stream, address block_begin) {
jrose@1590	598	print_nmethod_labels(stream, block_begin);
jrose@1590	599	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	600	}
jrose@1590	601	void print_nmethod_labels(outputStream* stream, address block_begin);
jrose@1590	602
duke@435	603	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	604	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	605	static void print_statistics() PRODUCT_RETURN;
duke@435	606
duke@435	607	// Compiler task identification. Note that all OSR methods
duke@435	608	// are numbered in an independent sequence if CICountOSR is true,
duke@435	609	// and native method wrappers are also numbered independently if
duke@435	610	// CICountNative is true.
duke@435	611	int compile_id() const { return _compile_id; }
duke@435	612	const char* compile_kind() const;
duke@435	613
duke@435	614	// For debugging
duke@435	615	// CompiledIC* IC_at(char* p) const;
duke@435	616	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	617	oop embeddedOop_at(address p);
duke@435	618
duke@435	619	// tells if any of this method's dependencies have been invalidated
duke@435	620	// (this is expensive!)
duke@435	621	bool check_all_dependencies();
duke@435	622
duke@435	623	// tells if this compiled method is dependent on the given changes,
duke@435	624	// and the changes have invalidated it
duke@435	625	bool check_dependency_on(DepChange& changes);
duke@435	626
duke@435	627	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	628	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	629	// this compiled method will have to be deoptimized.
duke@435	630	bool is_evol_dependent_on(klassOop dependee);
duke@435	631
duke@435	632	// Fast breakpoint support. Tells if this compiled method is
duke@435	633	// dependent on the given method. Returns true if this nmethod
duke@435	634	// corresponds to the given method as well.
duke@435	635	bool is_dependent_on_method(methodOop dependee);
duke@435	636
duke@435	637	// is it ok to patch at address?
duke@435	638	bool is_patchable_at(address instr_address);
duke@435	639
duke@435	640	// UseBiasedLocking support
duke@435	641	ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
duke@435	642	return _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435	643	}
duke@435	644	ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
duke@435	645	return _compiled_synchronized_native_basic_lock_sp_offset;
duke@435	646	}
duke@435	647
duke@435	648	// support for code generation
duke@435	649	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	650	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	651	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	652
duke@435	653	};
duke@435	654
duke@435	655	// Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
duke@435	656	class nmethodLocker : public StackObj {
duke@435	657	nmethod* _nm;
duke@435	658
duke@435	659	static void lock_nmethod(nmethod* nm); // note: nm can be NULL
duke@435	660	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	661
duke@435	662	public:
duke@435	663	nmethodLocker(address pc); // derive nm from pc
duke@435	664	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	665	nmethodLocker() { _nm = NULL; }
duke@435	666	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	667
duke@435	668	nmethod* code() { return _nm; }
duke@435	669	void set_code(nmethod* new_nm) {
duke@435	670	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	671	_nm = new_nm;
duke@435	672	lock_nmethod(_nm);
duke@435	673	}
duke@435	674	};