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src/share/vm/code/nmethod.hpp@d5d065957597 (annotated)

src/share/vm/code/nmethod.hpp

Fri, 03 Sep 2010 17:51:07 -0700

author

iveresov

date

Fri, 03 Sep 2010 17:51:07 -0700

changeset 2138

d5d065957597

parent 2117

0878d7bae69f

child 2314

f95d63e2154a

permissions

-rw-r--r--

6953144: Tiered compilation
Summary: Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation.
Reviewed-by: kvn, never, phh, twisti

duke@435	1	/*
trims@1907	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* 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.
never@1999	81	//
never@1999	82	// An nmethod contains:
duke@435	83	// - header (the nmethod structure)
duke@435	84	// [Relocation]
duke@435	85	// - relocation information
duke@435	86	// - constant part (doubles, longs and floats used in nmethod)
twisti@1918	87	// - oop table
duke@435	88	// [Code]
duke@435	89	// - code body
duke@435	90	// - exception handler
duke@435	91	// - stub code
duke@435	92	// [Debugging information]
duke@435	93	// - oop array
duke@435	94	// - data array
duke@435	95	// - pcs
duke@435	96	// [Exception handler table]
duke@435	97	// - handler entry point array
duke@435	98	// [Implicit Null Pointer exception table]
duke@435	99	// - implicit null table array
duke@435	100
duke@435	101	class Dependencies;
duke@435	102	class ExceptionHandlerTable;
duke@435	103	class ImplicitExceptionTable;
duke@435	104	class AbstractCompiler;
duke@435	105	class xmlStream;
duke@435	106
duke@435	107	class nmethod : public CodeBlob {
duke@435	108	friend class VMStructs;
duke@435	109	friend class NMethodSweeper;
jrose@1424	110	friend class CodeCache; // non-perm oops
duke@435	111	private:
duke@435	112	// Shared fields for all nmethod's
duke@435	113	methodOop _method;
duke@435	114	int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
never@1971	115	jmethodID _jmethod_id; // Cache of method()->jmethod_id()
duke@435	116
jrose@1424	117	// To support simple linked-list chaining of nmethods:
jrose@1424	118	nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
jrose@1424	119	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
kvn@1637	120	nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
jrose@1424	121
jrose@1424	122	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	123	nmethod* volatile _oops_do_mark_link;
duke@435	124
duke@435	125	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	126
never@1999	127	// offsets for entry points
never@1999	128	address _entry_point; // entry point with class check
never@1999	129	address _verified_entry_point; // entry point without class check
never@1999	130	address _osr_entry_point; // entry point for on stack replacement
never@1999	131
duke@435	132	// Offsets for different nmethod parts
duke@435	133	int _exception_offset;
twisti@1639	134	// All deoptee's will resume execution at this location described by
twisti@1639	135	// this offset.
duke@435	136	int _deoptimize_offset;
twisti@1639	137	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	138	// at this location described by this offset.
twisti@1639	139	int _deoptimize_mh_offset;
never@1813	140	// Offset of the unwind handler if it exists
never@1813	141	int _unwind_handler_offset;
never@1813	142
kamg@551	143	#ifdef HAVE_DTRACE_H
kamg@551	144	int _trap_offset;
kamg@551	145	#endif // def HAVE_DTRACE_H
twisti@2117	146	int _consts_offset;
duke@435	147	int _stub_offset;
twisti@1918	148	int _oops_offset; // offset to where embedded oop table begins (inside data)
duke@435	149	int _scopes_data_offset;
duke@435	150	int _scopes_pcs_offset;
duke@435	151	int _dependencies_offset;
duke@435	152	int _handler_table_offset;
duke@435	153	int _nul_chk_table_offset;
duke@435	154	int _nmethod_end_offset;
duke@435	155
duke@435	156	// location in frame (offset for sp) that deopt can store the original
duke@435	157	// pc during a deopt.
duke@435	158	int _orig_pc_offset;
duke@435	159
never@1999	160	int _compile_id; // which compilation made this nmethod
never@1999	161	int _comp_level; // compilation level
duke@435	162
never@1999	163	// protected by CodeCache_lock
never@1999	164	bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
never@1999	165	bool _speculatively_disconnected; // Marked for potential unload
duke@435	166
never@1999	167	bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
never@1999	168	bool _marked_for_deoptimization; // Used for stack deoptimization
never@1999	169
never@1999	170	// used by jvmti to track if an unload event has been posted for this nmethod.
never@1999	171	bool _unload_reported;
never@1999	172
never@1999	173	// set during construction
never@1999	174	unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
never@1999	175	unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
never@1999	176
never@1999	177	// Protected by Patching_lock
never@1999	178	unsigned char _state; // {alive, not_entrant, zombie, unloaded)
never@1999	179
never@2081	180	#ifdef ASSERT
never@2081	181	bool _oops_are_stale; // indicates that it's no longer safe to access oops section
never@2081	182	#endif
never@2081	183
duke@435	184	enum { alive = 0,
twisti@1040	185	not_entrant = 1, // uncommon trap has happened but activations may still exist
duke@435	186	zombie = 2,
duke@435	187	unloaded = 3 };
duke@435	188
duke@435	189
jrose@1424	190	jbyte _scavenge_root_state;
jrose@1424	191
duke@435	192	NOT_PRODUCT(bool _has_debug_info; )
duke@435	193
duke@435	194	// Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
duke@435	195	jint _lock_count;
duke@435	196
duke@435	197	// not_entrant method removal. Each mark_sweep pass will update
duke@435	198	// this mark to current sweep invocation count if it is seen on the
duke@435	199	// stack. An not_entrant method can be removed when there is no
duke@435	200	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	201	// current sweep traversal index.
duke@435	202	long _stack_traversal_mark;
duke@435	203
duke@435	204	ExceptionCache *_exception_cache;
duke@435	205	PcDescCache _pc_desc_cache;
duke@435	206
duke@435	207	// These are only used for compiled synchronized native methods to
duke@435	208	// locate the owner and stack slot for the BasicLock so that we can
duke@435	209	// properly revoke the bias of the owner if necessary. They are
duke@435	210	// needed because there is no debug information for compiled native
duke@435	211	// wrappers and the oop maps are insufficient to allow
duke@435	212	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	213	// to be byte offsets from the Java stack pointer for maximum code
duke@435	214	// sharing between platforms. Note that currently biased locking
duke@435	215	// will never cause Class instances to be biased but this code
duke@435	216	// handles the static synchronized case as well.
duke@435	217	ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435	218	ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
duke@435	219
duke@435	220	friend class nmethodLocker;
duke@435	221
duke@435	222	// For native wrappers
duke@435	223	nmethod(methodOop method,
duke@435	224	int nmethod_size,
duke@435	225	CodeOffsets* offsets,
duke@435	226	CodeBuffer *code_buffer,
duke@435	227	int frame_size,
duke@435	228	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	229	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	230	OopMapSet* oop_maps);
duke@435	231
kamg@551	232	#ifdef HAVE_DTRACE_H
kamg@551	233	// For native wrappers
kamg@551	234	nmethod(methodOop method,
kamg@551	235	int nmethod_size,
kamg@551	236	CodeOffsets* offsets,
kamg@551	237	CodeBuffer *code_buffer,
kamg@551	238	int frame_size);
kamg@551	239	#endif // def HAVE_DTRACE_H
kamg@551	240
duke@435	241	// Creation support
duke@435	242	nmethod(methodOop method,
duke@435	243	int nmethod_size,
duke@435	244	int compile_id,
duke@435	245	int entry_bci,
duke@435	246	CodeOffsets* offsets,
duke@435	247	int orig_pc_offset,
duke@435	248	DebugInformationRecorder *recorder,
duke@435	249	Dependencies* dependencies,
duke@435	250	CodeBuffer *code_buffer,
duke@435	251	int frame_size,
duke@435	252	OopMapSet* oop_maps,
duke@435	253	ExceptionHandlerTable* handler_table,
duke@435	254	ImplicitExceptionTable* nul_chk_table,
duke@435	255	AbstractCompiler* compiler,
duke@435	256	int comp_level);
duke@435	257
duke@435	258	// helper methods
duke@435	259	void* operator new(size_t size, int nmethod_size);
duke@435	260
duke@435	261	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	262	// Returns true if this thread changed the state of the nmethod or
never@1544	263	// false if another thread performed the transition.
never@1576	264	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	265	void inc_decompile_count();
duke@435	266
duke@435	267	// Used to manipulate the exception cache
duke@435	268	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	269	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	270
duke@435	271	// Inform external interfaces that a compiled method has been unloaded
never@1999	272	void post_compiled_method_unload();
never@1999	273
never@1999	274	// Initailize fields to their default values
never@1999	275	void init_defaults();
duke@435	276
duke@435	277	public:
duke@435	278	// create nmethod with entry_bci
duke@435	279	static nmethod* new_nmethod(methodHandle method,
duke@435	280	int compile_id,
duke@435	281	int entry_bci,
duke@435	282	CodeOffsets* offsets,
duke@435	283	int orig_pc_offset,
duke@435	284	DebugInformationRecorder* recorder,
duke@435	285	Dependencies* dependencies,
duke@435	286	CodeBuffer *code_buffer,
duke@435	287	int frame_size,
duke@435	288	OopMapSet* oop_maps,
duke@435	289	ExceptionHandlerTable* handler_table,
duke@435	290	ImplicitExceptionTable* nul_chk_table,
duke@435	291	AbstractCompiler* compiler,
duke@435	292	int comp_level);
duke@435	293
duke@435	294	static nmethod* new_native_nmethod(methodHandle method,
duke@435	295	CodeBuffer *code_buffer,
duke@435	296	int vep_offset,
duke@435	297	int frame_complete,
duke@435	298	int frame_size,
duke@435	299	ByteSize receiver_sp_offset,
duke@435	300	ByteSize basic_lock_sp_offset,
duke@435	301	OopMapSet* oop_maps);
duke@435	302
kamg@551	303	#ifdef HAVE_DTRACE_H
kamg@551	304	// The method we generate for a dtrace probe has to look
kamg@551	305	// like an nmethod as far as the rest of the system is concerned
kamg@551	306	// which is somewhat unfortunate.
kamg@551	307	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	308	CodeBuffer *code_buffer,
kamg@551	309	int vep_offset,
kamg@551	310	int trap_offset,
kamg@551	311	int frame_complete,
kamg@551	312	int frame_size);
kamg@551	313
kamg@551	314	int trap_offset() const { return _trap_offset; }
twisti@2103	315	address trap_address() const { return insts_begin() + _trap_offset; }
kamg@551	316
kamg@551	317	#endif // def HAVE_DTRACE_H
kamg@551	318
duke@435	319	// accessors
duke@435	320	methodOop method() const { return _method; }
duke@435	321	AbstractCompiler* compiler() const { return _compiler; }
duke@435	322
duke@435	323	#ifndef PRODUCT
duke@435	324	bool has_debug_info() const { return _has_debug_info; }
duke@435	325	void set_has_debug_info(bool f) { _has_debug_info = false; }
duke@435	326	#endif // NOT PRODUCT
duke@435	327
duke@435	328	// type info
duke@435	329	bool is_nmethod() const { return true; }
duke@435	330	bool is_java_method() const { return !method()->is_native(); }
duke@435	331	bool is_native_method() const { return method()->is_native(); }
duke@435	332	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	333
duke@435	334	bool is_compiled_by_c1() const;
duke@435	335	bool is_compiled_by_c2() const;
twisti@2047	336	bool is_compiled_by_shark() const;
duke@435	337
duke@435	338	// boundaries for different parts
twisti@2117	339	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@2117	340	address consts_end () const { return header_begin() + code_offset() ; }
twisti@2117	341	address insts_begin () const { return header_begin() + code_offset() ; }
twisti@2103	342	address insts_end () const { return header_begin() + _stub_offset ; }
twisti@2117	343	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@2117	344	address stub_end () const { return header_begin() + _oops_offset ; }
twisti@1639	345	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	346	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	347	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	348	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1918	349	oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
twisti@1918	350	oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
twisti@1918	351
twisti@1639	352	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	353	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	354	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	355	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	356	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	357	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	358	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	359	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	360	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	361	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	362
twisti@1918	363	// Sizes
twisti@2117	364	int consts_size () const { return consts_end () - consts_begin (); }
twisti@2103	365	int insts_size () const { return insts_end () - insts_begin (); }
twisti@1918	366	int stub_size () const { return stub_end () - stub_begin (); }
twisti@1918	367	int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
twisti@1918	368	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
twisti@1918	369	int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
twisti@1918	370	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
twisti@1918	371	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
twisti@1918	372	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	373
duke@435	374	int total_size () const;
duke@435	375
twisti@1918	376	// Containment
twisti@2117	377	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
twisti@2103	378	bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
duke@435	379	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
twisti@1918	380	bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
duke@435	381	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	382	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	383	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	384	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	385
duke@435	386	// entry points
duke@435	387	address entry_point() const { return _entry_point; } // normal entry point
duke@435	388	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	389
duke@435	390	// flag accessing and manipulation
never@1999	391	bool is_in_use() const { return _state == alive; }
never@1999	392	bool is_alive() const { return _state == alive || _state == not_entrant; }
never@1999	393	bool is_not_entrant() const { return _state == not_entrant; }
never@1999	394	bool is_zombie() const { return _state == zombie; }
never@1999	395	bool is_unloaded() const { return _state == unloaded; }
duke@435	396
never@1544	397	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	398	// alive. It is used when an uncommon trap happens. Returns true
never@1544	399	// if this thread changed the state of the nmethod or false if
never@1544	400	// another thread performed the transition.
never@1544	401	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
never@1544	402	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	403
duke@435	404	// used by jvmti to track if the unload event has been reported
duke@435	405	bool unload_reported() { return _unload_reported; }
duke@435	406	void set_unload_reported() { _unload_reported = true; }
duke@435	407
never@1999	408	bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
never@1999	409	void mark_for_deoptimization() { _marked_for_deoptimization = true; }
duke@435	410
duke@435	411	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	412
duke@435	413	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	414	void flush_dependencies(BoolObjectClosure* is_alive);
never@1999	415	bool has_flushed_dependencies() { return _has_flushed_dependencies; }
never@1999	416	void set_has_flushed_dependencies() {
duke@435	417	assert(!has_flushed_dependencies(), "should only happen once");
never@1999	418	_has_flushed_dependencies = 1;
duke@435	419	}
duke@435	420
never@1999	421	bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
never@1999	422	void mark_for_reclamation() { _marked_for_reclamation = 1; }
duke@435	423
never@1999	424	bool has_unsafe_access() const { return _has_unsafe_access; }
never@1999	425	void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
duke@435	426
never@1999	427	bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
never@1999	428	void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
twisti@1570	429
never@1999	430	bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
never@1999	431	void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
kvn@1637	432
duke@435	433	int comp_level() const { return _comp_level; }
duke@435	434
twisti@1918	435	// Support for oops in scopes and relocs:
twisti@1918	436	// Note: index 0 is reserved for null.
twisti@1918	437	oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
twisti@1918	438	oop* oop_addr_at(int index) const { // for GC
twisti@1918	439	// relocation indexes are biased by 1 (because 0 is reserved)
twisti@1918	440	assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
never@2081	441	assert(!_oops_are_stale, "oops are stale");
twisti@1918	442	return &oops_begin()[index - 1];
twisti@1918	443	}
twisti@1918	444
twisti@1918	445	void copy_oops(GrowableArray<jobject>* oops);
twisti@1918	446
twisti@1918	447	// Relocation support
twisti@1918	448	private:
twisti@1918	449	void fix_oop_relocations(address begin, address end, bool initialize_immediates);
twisti@1918	450	inline void initialize_immediate_oop(oop* dest, jobject handle);
twisti@1918	451
twisti@1918	452	public:
twisti@1918	453	void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
twisti@1918	454	void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
twisti@1918	455
twisti@1918	456	bool is_at_poll_return(address pc);
twisti@1918	457	bool is_at_poll_or_poll_return(address pc);
twisti@1918	458
jrose@1424	459	// Non-perm oop support
jrose@1424	460	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	461	protected:
jrose@1424	462	enum { npl_on_list = 0x01, npl_marked = 0x10 };
jrose@1424	463	void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
jrose@1424	464	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	465	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	466	#ifndef PRODUCT
jrose@1424	467	void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
jrose@1424	468	void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
jrose@1424	469	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
jrose@1424	470	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	471	#endif //PRODUCT
jrose@1424	472	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	473	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	474
kvn@1637	475	nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
kvn@1637	476	void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
kvn@1637	477
jrose@1424	478	public:
jrose@1424	479
duke@435	480	// Sweeper support
duke@435	481	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	482	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	483
duke@435	484	// Exception cache support
duke@435	485	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	486	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	487	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	488	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435	489	void remove_from_exception_cache(ExceptionCache* ec);
duke@435	490
duke@435	491	// implicit exceptions support
duke@435	492	address continuation_for_implicit_exception(address pc);
duke@435	493
duke@435	494	// On-stack replacement support
duke@435	495	int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
duke@435	496	address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	497	void invalidate_osr_method();
jrose@1424	498	nmethod* osr_link() const { return _osr_link; }
jrose@1424	499	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	500
duke@435	501	// tells whether frames described by this nmethod can be deoptimized
duke@435	502	// note: native wrappers cannot be deoptimized.
duke@435	503	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	504
duke@435	505	// Inline cache support
duke@435	506	void clear_inline_caches();
duke@435	507	void cleanup_inline_caches();
duke@435	508	bool inlinecache_check_contains(address addr) const {
twisti@2103	509	return (addr >= code_begin() && addr < verified_entry_point());
duke@435	510	}
duke@435	511
duke@435	512	// unlink and deallocate this nmethod
duke@435	513	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	514	// expected to use any other private methods/data in this class.
duke@435	515
duke@435	516	protected:
duke@435	517	void flush();
duke@435	518
duke@435	519	public:
duke@435	520	// If returning true, it is unsafe to remove this nmethod even though it is a zombie
duke@435	521	// nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
duke@435	522	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	523
duke@435	524	// See comment at definition of _last_seen_on_stack
duke@435	525	void mark_as_seen_on_stack();
duke@435	526	bool can_not_entrant_be_converted();
duke@435	527
duke@435	528	// Evolution support. We make old (discarded) compiled methods point to new methodOops.
duke@435	529	void set_method(methodOop method) { _method = method; }
duke@435	530
duke@435	531	// GC support
duke@435	532	void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	533	bool unloading_occurred);
duke@435	534	bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	535	oop* root, bool unloading_occurred);
duke@435	536
duke@435	537	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	538	OopClosure* f);
twisti@1918	539	void oops_do(OopClosure* f) { oops_do(f, false); }
twisti@1918	540	void oops_do(OopClosure* f, bool do_strong_roots_only);
jrose@1424	541	bool detect_scavenge_root_oops();
jrose@1424	542	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	543
jrose@1424	544	bool test_set_oops_do_mark();
jrose@1424	545	static void oops_do_marking_prologue();
jrose@1424	546	static void oops_do_marking_epilogue();
jrose@1424	547	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
jrose@1424	548	DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
duke@435	549
duke@435	550	// ScopeDesc for an instruction
duke@435	551	ScopeDesc* scope_desc_at(address pc);
duke@435	552
duke@435	553	private:
duke@435	554	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	555
twisti@1639	556	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	557
duke@435	558	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	559
duke@435	560	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	561	PcDesc* desc = _pc_desc_cache.last_pc_desc();
twisti@2103	562	if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
duke@435	563	return desc;
duke@435	564	}
duke@435	565	return find_pc_desc_internal(pc, approximate);
duke@435	566	}
duke@435	567
duke@435	568	public:
duke@435	569	// ScopeDesc retrieval operation
duke@435	570	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	571	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	572	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	573
duke@435	574	public:
duke@435	575	// copying of debugging information
duke@435	576	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	577	void copy_scopes_data(address buffer, int size);
duke@435	578
twisti@1639	579	// Deopt
twisti@1639	580	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	581	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	582	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	583	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	584	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	585	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	586	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	587
twisti@1639	588	static address get_deopt_original_pc(const frame* fr);
twisti@1639	589
twisti@1570	590	// MethodHandle
twisti@1570	591	bool is_method_handle_return(address return_pc);
twisti@1570	592
duke@435	593	// jvmti support:
duke@435	594	void post_compiled_method_load_event();
never@1971	595	jmethodID get_and_cache_jmethod_id();
duke@435	596
duke@435	597	// verify operations
duke@435	598	void verify();
duke@435	599	void verify_scopes();
duke@435	600	void verify_interrupt_point(address interrupt_point);
duke@435	601
iveresov@2138	602	// print compilation helper
iveresov@2138	603	static void print_compilation(outputStream *st, const char *method_name, const char *title,
iveresov@2138	604	methodOop method, bool is_blocking, int compile_id, int bci, int comp_level);
iveresov@2138	605
duke@435	606	// printing support
jrose@535	607	void print() const;
jrose@535	608	void print_code();
duke@435	609	void print_relocations() PRODUCT_RETURN;
duke@435	610	void print_pcs() PRODUCT_RETURN;
duke@435	611	void print_scopes() PRODUCT_RETURN;
duke@435	612	void print_dependencies() PRODUCT_RETURN;
duke@435	613	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	614	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	615	void print_handler_table() PRODUCT_RETURN;
duke@435	616	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	617	void print_nmethod(bool print_code);
duke@435	618
bobv@2036	619	// need to re-define this from CodeBlob else the overload hides it
bobv@2036	620	virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
duke@435	621	void print_on(outputStream* st, const char* title) const;
duke@435	622
duke@435	623	// Logging
duke@435	624	void log_identity(xmlStream* log) const;
duke@435	625	void log_new_nmethod() const;
never@1544	626	void log_state_change() const;
duke@435	627
jrose@1590	628	// Prints block-level comments, including nmethod specific block labels:
jrose@1590	629	virtual void print_block_comment(outputStream* stream, address block_begin) {
jrose@1590	630	print_nmethod_labels(stream, block_begin);
jrose@1590	631	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	632	}
jrose@1590	633	void print_nmethod_labels(outputStream* stream, address block_begin);
jrose@1590	634
duke@435	635	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	636	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	637	static void print_statistics() PRODUCT_RETURN;
duke@435	638
duke@435	639	// Compiler task identification. Note that all OSR methods
duke@435	640	// are numbered in an independent sequence if CICountOSR is true,
duke@435	641	// and native method wrappers are also numbered independently if
duke@435	642	// CICountNative is true.
duke@435	643	int compile_id() const { return _compile_id; }
duke@435	644	const char* compile_kind() const;
duke@435	645
duke@435	646	// For debugging
duke@435	647	// CompiledIC* IC_at(char* p) const;
duke@435	648	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	649	oop embeddedOop_at(address p);
duke@435	650
duke@435	651	// tells if any of this method's dependencies have been invalidated
duke@435	652	// (this is expensive!)
duke@435	653	bool check_all_dependencies();
duke@435	654
duke@435	655	// tells if this compiled method is dependent on the given changes,
duke@435	656	// and the changes have invalidated it
duke@435	657	bool check_dependency_on(DepChange& changes);
duke@435	658
duke@435	659	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	660	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	661	// this compiled method will have to be deoptimized.
duke@435	662	bool is_evol_dependent_on(klassOop dependee);
duke@435	663
duke@435	664	// Fast breakpoint support. Tells if this compiled method is
duke@435	665	// dependent on the given method. Returns true if this nmethod
duke@435	666	// corresponds to the given method as well.
duke@435	667	bool is_dependent_on_method(methodOop dependee);
duke@435	668
duke@435	669	// is it ok to patch at address?
duke@435	670	bool is_patchable_at(address instr_address);
duke@435	671
duke@435	672	// UseBiasedLocking support
duke@435	673	ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
duke@435	674	return _compiled_synchronized_native_basic_lock_owner_sp_offset;
duke@435	675	}
duke@435	676	ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
duke@435	677	return _compiled_synchronized_native_basic_lock_sp_offset;
duke@435	678	}
duke@435	679
duke@435	680	// support for code generation
duke@435	681	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	682	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	683	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	684
duke@435	685	};
duke@435	686
duke@435	687	// Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
duke@435	688	class nmethodLocker : public StackObj {
duke@435	689	nmethod* _nm;
duke@435	690
duke@435	691	static void lock_nmethod(nmethod* nm); // note: nm can be NULL
duke@435	692	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	693
duke@435	694	public:
duke@435	695	nmethodLocker(address pc); // derive nm from pc
duke@435	696	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	697	nmethodLocker() { _nm = NULL; }
duke@435	698	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	699
duke@435	700	nmethod* code() { return _nm; }
duke@435	701	void set_code(nmethod* new_nm) {
duke@435	702	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	703	_nm = new_nm;
duke@435	704	lock_nmethod(_nm);
duke@435	705	}
duke@435	706	};