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src/share/vm/code/nmethod.hpp@e2509677809c (annotated)

src/share/vm/code/nmethod.hpp

Fri, 08 Nov 2013 01:13:11 -0800

author

vlivanov

date

Fri, 08 Nov 2013 01:13:11 -0800

changeset 6096

e2509677809c

parent 5792

510fbd28919c

child 6172

df832bd8edb9

permissions

-rw-r--r--

8023037: Race between ciEnv::register_method and nmethod::make_not_entrant_or_zombie
Reviewed-by: kvn, iveresov

duke@435	1	/*
coleenp@5614	2	* Copyright (c) 1997, 2013, 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
stefank@2314	25	#ifndef SHARE_VM_CODE_NMETHOD_HPP
stefank@2314	26	#define SHARE_VM_CODE_NMETHOD_HPP
stefank@2314	27
stefank@2314	28	#include "code/codeBlob.hpp"
stefank@2314	29	#include "code/pcDesc.hpp"
coleenp@4037	30	#include "oops/metadata.hpp"
stefank@2314	31
duke@435	32	// This class is used internally by nmethods, to cache
duke@435	33	// exception/pc/handler information.
duke@435	34
zgu@3900	35	class ExceptionCache : public CHeapObj<mtCode> {
duke@435	36	friend class VMStructs;
duke@435	37	private:
duke@435	38	enum { cache_size = 16 };
coleenp@4037	39	Klass* _exception_type;
duke@435	40	address _pc[cache_size];
duke@435	41	address _handler[cache_size];
duke@435	42	int _count;
duke@435	43	ExceptionCache* _next;
duke@435	44
duke@435	45	address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
duke@435	46	void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
duke@435	47	address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
duke@435	48	void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
duke@435	49	int count() { return _count; }
duke@435	50	void increment_count() { _count++; }
duke@435	51
duke@435	52	public:
duke@435	53
duke@435	54	ExceptionCache(Handle exception, address pc, address handler);
duke@435	55
coleenp@4037	56	Klass* exception_type() { return _exception_type; }
duke@435	57	ExceptionCache* next() { return _next; }
duke@435	58	void set_next(ExceptionCache *ec) { _next = ec; }
duke@435	59
duke@435	60	address match(Handle exception, address pc);
duke@435	61	bool match_exception_with_space(Handle exception) ;
duke@435	62	address test_address(address addr);
duke@435	63	bool add_address_and_handler(address addr, address handler) ;
duke@435	64	};
duke@435	65
duke@435	66
duke@435	67	// cache pc descs found in earlier inquiries
duke@435	68	class PcDescCache VALUE_OBJ_CLASS_SPEC {
duke@435	69	friend class VMStructs;
duke@435	70	private:
duke@435	71	enum { cache_size = 4 };
duke@435	72	PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
duke@435	73	public:
phh@2621	74	PcDescCache() { debug_only(_pc_descs[0] = NULL); }
duke@435	75	void reset_to(PcDesc* initial_pc_desc);
duke@435	76	PcDesc* find_pc_desc(int pc_offset, bool approximate);
duke@435	77	void add_pc_desc(PcDesc* pc_desc);
phh@2621	78	PcDesc* last_pc_desc() { return _pc_descs[0]; }
duke@435	79	};
duke@435	80
duke@435	81
duke@435	82	// nmethods (native methods) are the compiled code versions of Java methods.
never@1999	83	//
never@1999	84	// An nmethod contains:
duke@435	85	// - header (the nmethod structure)
duke@435	86	// [Relocation]
duke@435	87	// - relocation information
duke@435	88	// - constant part (doubles, longs and floats used in nmethod)
twisti@1918	89	// - oop table
duke@435	90	// [Code]
duke@435	91	// - code body
duke@435	92	// - exception handler
duke@435	93	// - stub code
duke@435	94	// [Debugging information]
duke@435	95	// - oop array
duke@435	96	// - data array
duke@435	97	// - pcs
duke@435	98	// [Exception handler table]
duke@435	99	// - handler entry point array
duke@435	100	// [Implicit Null Pointer exception table]
duke@435	101	// - implicit null table array
duke@435	102
duke@435	103	class Dependencies;
duke@435	104	class ExceptionHandlerTable;
duke@435	105	class ImplicitExceptionTable;
duke@435	106	class AbstractCompiler;
duke@435	107	class xmlStream;
duke@435	108
duke@435	109	class nmethod : public CodeBlob {
duke@435	110	friend class VMStructs;
duke@435	111	friend class NMethodSweeper;
jmasa@2909	112	friend class CodeCache; // scavengable oops
duke@435	113	private:
duke@435	114	// Shared fields for all nmethod's
coleenp@4037	115	Method* _method;
duke@435	116	int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
never@1971	117	jmethodID _jmethod_id; // Cache of method()->jmethod_id()
duke@435	118
jrose@1424	119	// To support simple linked-list chaining of nmethods:
coleenp@4037	120	nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
jrose@1424	121	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
jrose@1424	122
jrose@1424	123	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	124	nmethod* volatile _oops_do_mark_link;
duke@435	125
duke@435	126	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	127
never@1999	128	// offsets for entry points
never@1999	129	address _entry_point; // entry point with class check
never@1999	130	address _verified_entry_point; // entry point without class check
never@1999	131	address _osr_entry_point; // entry point for on stack replacement
never@1999	132
duke@435	133	// Offsets for different nmethod parts
duke@435	134	int _exception_offset;
twisti@1639	135	// All deoptee's will resume execution at this location described by
twisti@1639	136	// this offset.
duke@435	137	int _deoptimize_offset;
twisti@1639	138	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	139	// at this location described by this offset.
twisti@1639	140	int _deoptimize_mh_offset;
never@1813	141	// Offset of the unwind handler if it exists
never@1813	142	int _unwind_handler_offset;
never@1813	143
kamg@551	144	#ifdef HAVE_DTRACE_H
kamg@551	145	int _trap_offset;
kamg@551	146	#endif // def HAVE_DTRACE_H
twisti@2117	147	int _consts_offset;
duke@435	148	int _stub_offset;
twisti@1918	149	int _oops_offset; // offset to where embedded oop table begins (inside data)
coleenp@4037	150	int _metadata_offset; // embedded meta data table
duke@435	151	int _scopes_data_offset;
duke@435	152	int _scopes_pcs_offset;
duke@435	153	int _dependencies_offset;
duke@435	154	int _handler_table_offset;
duke@435	155	int _nul_chk_table_offset;
duke@435	156	int _nmethod_end_offset;
duke@435	157
duke@435	158	// location in frame (offset for sp) that deopt can store the original
duke@435	159	// pc during a deopt.
duke@435	160	int _orig_pc_offset;
duke@435	161
never@1999	162	int _compile_id; // which compilation made this nmethod
never@1999	163	int _comp_level; // compilation level
duke@435	164
never@1999	165	// protected by CodeCache_lock
never@1999	166	bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
duke@435	167
never@1999	168	bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
never@1999	169	bool _marked_for_deoptimization; // Used for stack deoptimization
never@1999	170
never@1999	171	// used by jvmti to track if an unload event has been posted for this nmethod.
never@1999	172	bool _unload_reported;
never@1999	173
never@1999	174	// set during construction
never@1999	175	unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
never@1999	176	unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
never@3500	177	unsigned int _lazy_critical_native:1; // Lazy JNI critical native
kvn@4103	178	unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints
never@1999	179
never@1999	180	// Protected by Patching_lock
anoll@5792	181	volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded}
never@1999	182
never@2081	183	#ifdef ASSERT
never@2081	184	bool _oops_are_stale; // indicates that it's no longer safe to access oops section
never@2081	185	#endif
never@2081	186
duke@435	187	enum { alive = 0,
twisti@1040	188	not_entrant = 1, // uncommon trap has happened but activations may still exist
duke@435	189	zombie = 2,
duke@435	190	unloaded = 3 };
duke@435	191
duke@435	192
jrose@1424	193	jbyte _scavenge_root_state;
jrose@1424	194
dcubed@2624	195	// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
dcubed@2624	196	// and is not made into a zombie. However, once the nmethod is made into
dcubed@2624	197	// a zombie, it will be locked one final time if CompiledMethodUnload
dcubed@2624	198	// event processing needs to be done.
duke@435	199	jint _lock_count;
duke@435	200
duke@435	201	// not_entrant method removal. Each mark_sweep pass will update
duke@435	202	// this mark to current sweep invocation count if it is seen on the
anoll@5792	203	// stack. An not_entrant method can be removed when there are no
duke@435	204	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	205	// current sweep traversal index.
duke@435	206	long _stack_traversal_mark;
duke@435	207
anoll@5792	208	// The _hotness_counter indicates the hotness of a method. The higher
anoll@5792	209	// the value the hotter the method. The hotness counter of a nmethod is
anoll@5792	210	// set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
anoll@5792	211	// is active while stack scanning (mark_active_nmethods()). The hotness
anoll@5792	212	// counter is decreased (by 1) while sweeping.
anoll@5792	213	int _hotness_counter;
anoll@5792	214
duke@435	215	ExceptionCache *_exception_cache;
duke@435	216	PcDescCache _pc_desc_cache;
duke@435	217
kamg@2361	218	// These are used for compiled synchronized native methods to
duke@435	219	// locate the owner and stack slot for the BasicLock so that we can
duke@435	220	// properly revoke the bias of the owner if necessary. They are
duke@435	221	// needed because there is no debug information for compiled native
duke@435	222	// wrappers and the oop maps are insufficient to allow
duke@435	223	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	224	// to be byte offsets from the Java stack pointer for maximum code
duke@435	225	// sharing between platforms. Note that currently biased locking
duke@435	226	// will never cause Class instances to be biased but this code
duke@435	227	// handles the static synchronized case as well.
kamg@2361	228	// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
kamg@2361	229	// for non-static native wrapper frames.
kamg@2361	230	ByteSize _native_receiver_sp_offset;
kamg@2361	231	ByteSize _native_basic_lock_sp_offset;
duke@435	232
duke@435	233	friend class nmethodLocker;
duke@435	234
duke@435	235	// For native wrappers
coleenp@4037	236	nmethod(Method* method,
duke@435	237	int nmethod_size,
twisti@2687	238	int compile_id,
duke@435	239	CodeOffsets* offsets,
duke@435	240	CodeBuffer *code_buffer,
duke@435	241	int frame_size,
duke@435	242	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	243	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	244	OopMapSet* oop_maps);
duke@435	245
kamg@551	246	#ifdef HAVE_DTRACE_H
kamg@551	247	// For native wrappers
coleenp@4037	248	nmethod(Method* method,
kamg@551	249	int nmethod_size,
kamg@551	250	CodeOffsets* offsets,
kamg@551	251	CodeBuffer *code_buffer,
kamg@551	252	int frame_size);
kamg@551	253	#endif // def HAVE_DTRACE_H
kamg@551	254
duke@435	255	// Creation support
coleenp@4037	256	nmethod(Method* method,
duke@435	257	int nmethod_size,
duke@435	258	int compile_id,
duke@435	259	int entry_bci,
duke@435	260	CodeOffsets* offsets,
duke@435	261	int orig_pc_offset,
duke@435	262	DebugInformationRecorder *recorder,
duke@435	263	Dependencies* dependencies,
duke@435	264	CodeBuffer *code_buffer,
duke@435	265	int frame_size,
duke@435	266	OopMapSet* oop_maps,
duke@435	267	ExceptionHandlerTable* handler_table,
duke@435	268	ImplicitExceptionTable* nul_chk_table,
duke@435	269	AbstractCompiler* compiler,
duke@435	270	int comp_level);
duke@435	271
duke@435	272	// helper methods
coleenp@5614	273	void* operator new(size_t size, int nmethod_size) throw();
duke@435	274
duke@435	275	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	276	// Returns true if this thread changed the state of the nmethod or
never@1544	277	// false if another thread performed the transition.
never@1576	278	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	279	void inc_decompile_count();
duke@435	280
duke@435	281	// Used to manipulate the exception cache
duke@435	282	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	283	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	284
duke@435	285	// Inform external interfaces that a compiled method has been unloaded
never@1999	286	void post_compiled_method_unload();
never@1999	287
never@1999	288	// Initailize fields to their default values
never@1999	289	void init_defaults();
duke@435	290
duke@435	291	public:
duke@435	292	// create nmethod with entry_bci
duke@435	293	static nmethod* new_nmethod(methodHandle method,
duke@435	294	int compile_id,
duke@435	295	int entry_bci,
duke@435	296	CodeOffsets* offsets,
duke@435	297	int orig_pc_offset,
duke@435	298	DebugInformationRecorder* recorder,
duke@435	299	Dependencies* dependencies,
duke@435	300	CodeBuffer *code_buffer,
duke@435	301	int frame_size,
duke@435	302	OopMapSet* oop_maps,
duke@435	303	ExceptionHandlerTable* handler_table,
duke@435	304	ImplicitExceptionTable* nul_chk_table,
duke@435	305	AbstractCompiler* compiler,
duke@435	306	int comp_level);
duke@435	307
duke@435	308	static nmethod* new_native_nmethod(methodHandle method,
twisti@2687	309	int compile_id,
duke@435	310	CodeBuffer *code_buffer,
duke@435	311	int vep_offset,
duke@435	312	int frame_complete,
duke@435	313	int frame_size,
duke@435	314	ByteSize receiver_sp_offset,
duke@435	315	ByteSize basic_lock_sp_offset,
duke@435	316	OopMapSet* oop_maps);
duke@435	317
kamg@551	318	#ifdef HAVE_DTRACE_H
kamg@551	319	// The method we generate for a dtrace probe has to look
kamg@551	320	// like an nmethod as far as the rest of the system is concerned
kamg@551	321	// which is somewhat unfortunate.
kamg@551	322	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	323	CodeBuffer *code_buffer,
kamg@551	324	int vep_offset,
kamg@551	325	int trap_offset,
kamg@551	326	int frame_complete,
kamg@551	327	int frame_size);
kamg@551	328
kamg@551	329	int trap_offset() const { return _trap_offset; }
twisti@2103	330	address trap_address() const { return insts_begin() + _trap_offset; }
kamg@551	331
kamg@551	332	#endif // def HAVE_DTRACE_H
kamg@551	333
duke@435	334	// accessors
coleenp@4037	335	Method* method() const { return _method; }
duke@435	336	AbstractCompiler* compiler() const { return _compiler; }
duke@435	337
duke@435	338	// type info
duke@435	339	bool is_nmethod() const { return true; }
duke@435	340	bool is_java_method() const { return !method()->is_native(); }
duke@435	341	bool is_native_method() const { return method()->is_native(); }
duke@435	342	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	343
duke@435	344	bool is_compiled_by_c1() const;
duke@435	345	bool is_compiled_by_c2() const;
twisti@2047	346	bool is_compiled_by_shark() const;
duke@435	347
duke@435	348	// boundaries for different parts
twisti@2117	349	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@2117	350	address consts_end () const { return header_begin() + code_offset() ; }
twisti@2117	351	address insts_begin () const { return header_begin() + code_offset() ; }
twisti@2103	352	address insts_end () const { return header_begin() + _stub_offset ; }
twisti@2117	353	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@2117	354	address stub_end () const { return header_begin() + _oops_offset ; }
twisti@1639	355	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	356	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	357	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	358	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1918	359	oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
coleenp@4037	360	oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
coleenp@4037	361
coleenp@4037	362	Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
coleenp@4037	363	Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; }
twisti@1918	364
twisti@1639	365	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	366	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	367	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	368	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	369	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	370	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	371	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	372	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	373	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	374	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	375
twisti@1918	376	// Sizes
twisti@2117	377	int consts_size () const { return consts_end () - consts_begin (); }
twisti@2103	378	int insts_size () const { return insts_end () - insts_begin (); }
twisti@1918	379	int stub_size () const { return stub_end () - stub_begin (); }
twisti@1918	380	int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
coleenp@4037	381	int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
twisti@1918	382	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
twisti@1918	383	int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
twisti@1918	384	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
twisti@1918	385	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
twisti@1918	386	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	387
duke@435	388	int total_size () const;
duke@435	389
anoll@5792	390	void dec_hotness_counter() { _hotness_counter--; }
anoll@5792	391	void set_hotness_counter(int val) { _hotness_counter = val; }
anoll@5792	392	int hotness_counter() const { return _hotness_counter; }
anoll@5792	393
twisti@1918	394	// Containment
twisti@2117	395	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
twisti@2103	396	bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
duke@435	397	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
twisti@1918	398	bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
coleenp@4037	399	bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
duke@435	400	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	401	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	402	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	403	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	404
duke@435	405	// entry points
duke@435	406	address entry_point() const { return _entry_point; } // normal entry point
duke@435	407	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	408
duke@435	409	// flag accessing and manipulation
never@1999	410	bool is_in_use() const { return _state == alive; }
never@1999	411	bool is_alive() const { return _state == alive || _state == not_entrant; }
never@1999	412	bool is_not_entrant() const { return _state == not_entrant; }
never@1999	413	bool is_zombie() const { return _state == zombie; }
never@1999	414	bool is_unloaded() const { return _state == unloaded; }
duke@435	415
never@1544	416	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	417	// alive. It is used when an uncommon trap happens. Returns true
never@1544	418	// if this thread changed the state of the nmethod or false if
never@1544	419	// another thread performed the transition.
anoll@5792	420	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
anoll@5792	421	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	422
duke@435	423	// used by jvmti to track if the unload event has been reported
duke@435	424	bool unload_reported() { return _unload_reported; }
duke@435	425	void set_unload_reported() { _unload_reported = true; }
duke@435	426
never@1999	427	bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
never@1999	428	void mark_for_deoptimization() { _marked_for_deoptimization = true; }
duke@435	429
duke@435	430	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	431
duke@435	432	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	433	void flush_dependencies(BoolObjectClosure* is_alive);
never@1999	434	bool has_flushed_dependencies() { return _has_flushed_dependencies; }
never@1999	435	void set_has_flushed_dependencies() {
duke@435	436	assert(!has_flushed_dependencies(), "should only happen once");
never@1999	437	_has_flushed_dependencies = 1;
duke@435	438	}
duke@435	439
never@1999	440	bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
never@1999	441	void mark_for_reclamation() { _marked_for_reclamation = 1; }
duke@435	442
never@1999	443	bool has_unsafe_access() const { return _has_unsafe_access; }
never@1999	444	void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
duke@435	445
never@1999	446	bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
never@1999	447	void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
twisti@1570	448
never@3500	449	bool is_lazy_critical_native() const { return _lazy_critical_native; }
never@3500	450	void set_lazy_critical_native(bool z) { _lazy_critical_native = z; }
kvn@1637	451
kvn@4103	452	bool has_wide_vectors() const { return _has_wide_vectors; }
kvn@4103	453	void set_has_wide_vectors(bool z) { _has_wide_vectors = z; }
kvn@4103	454
duke@435	455	int comp_level() const { return _comp_level; }
duke@435	456
twisti@1918	457	// Support for oops in scopes and relocs:
twisti@1918	458	// Note: index 0 is reserved for null.
twisti@1918	459	oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
twisti@1918	460	oop* oop_addr_at(int index) const { // for GC
twisti@1918	461	// relocation indexes are biased by 1 (because 0 is reserved)
twisti@1918	462	assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
never@2081	463	assert(!_oops_are_stale, "oops are stale");
twisti@1918	464	return &oops_begin()[index - 1];
twisti@1918	465	}
twisti@1918	466
coleenp@4037	467	// Support for meta data in scopes and relocs:
coleenp@4037	468	// Note: index 0 is reserved for null.
coleenp@4037	469	Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
coleenp@4037	470	Metadata** metadata_addr_at(int index) const { // for GC
coleenp@4037	471	// relocation indexes are biased by 1 (because 0 is reserved)
coleenp@4037	472	assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index");
coleenp@4037	473	return &metadata_begin()[index - 1];
coleenp@4037	474	}
coleenp@4037	475
coleenp@4037	476	void copy_values(GrowableArray<jobject>* oops);
coleenp@4037	477	void copy_values(GrowableArray<Metadata*>* metadata);
twisti@1918	478
twisti@1918	479	// Relocation support
twisti@1918	480	private:
twisti@1918	481	void fix_oop_relocations(address begin, address end, bool initialize_immediates);
twisti@1918	482	inline void initialize_immediate_oop(oop* dest, jobject handle);
twisti@1918	483
twisti@1918	484	public:
twisti@1918	485	void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
twisti@1918	486	void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
never@2657	487	void verify_oop_relocations();
twisti@1918	488
twisti@1918	489	bool is_at_poll_return(address pc);
twisti@1918	490	bool is_at_poll_or_poll_return(address pc);
twisti@1918	491
jmasa@2909	492	// Scavengable oop support
jrose@1424	493	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	494	protected:
jmasa@2909	495	enum { sl_on_list = 0x01, sl_marked = 0x10 };
jmasa@2909	496	void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; }
jrose@1424	497	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	498	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	499	#ifndef PRODUCT
jmasa@2909	500	void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; }
jmasa@2909	501	void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; }
jmasa@2909	502	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; }
jrose@1424	503	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	504	#endif //PRODUCT
jrose@1424	505	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	506	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	507
jrose@1424	508	public:
jrose@1424	509
duke@435	510	// Sweeper support
duke@435	511	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	512	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	513
duke@435	514	// Exception cache support
duke@435	515	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	516	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	517	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	518	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435	519	void remove_from_exception_cache(ExceptionCache* ec);
duke@435	520
duke@435	521	// implicit exceptions support
duke@435	522	address continuation_for_implicit_exception(address pc);
duke@435	523
duke@435	524	// On-stack replacement support
twisti@2687	525	int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
twisti@2687	526	address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	527	void invalidate_osr_method();
jrose@1424	528	nmethod* osr_link() const { return _osr_link; }
jrose@1424	529	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	530
duke@435	531	// tells whether frames described by this nmethod can be deoptimized
duke@435	532	// note: native wrappers cannot be deoptimized.
duke@435	533	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	534
duke@435	535	// Inline cache support
duke@435	536	void clear_inline_caches();
duke@435	537	void cleanup_inline_caches();
duke@435	538	bool inlinecache_check_contains(address addr) const {
twisti@2103	539	return (addr >= code_begin() && addr < verified_entry_point());
duke@435	540	}
duke@435	541
coleenp@4037	542	// Check that all metadata is still alive
coleenp@4037	543	void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive);
coleenp@4037	544
duke@435	545	// unlink and deallocate this nmethod
duke@435	546	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	547	// expected to use any other private methods/data in this class.
duke@435	548
duke@435	549	protected:
duke@435	550	void flush();
duke@435	551
duke@435	552	public:
dcubed@2624	553	// When true is returned, it is unsafe to remove this nmethod even if
dcubed@2624	554	// it is a zombie, since the VM or the ServiceThread might still be
dcubed@2624	555	// using it.
duke@435	556	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	557
duke@435	558	// See comment at definition of _last_seen_on_stack
duke@435	559	void mark_as_seen_on_stack();
duke@435	560	bool can_not_entrant_be_converted();
duke@435	561
coleenp@4037	562	// Evolution support. We make old (discarded) compiled methods point to new Method*s.
coleenp@4037	563	void set_method(Method* method) { _method = method; }
duke@435	564
duke@435	565	// GC support
brutisso@4098	566	void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
brutisso@4098	567	bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred);
duke@435	568
duke@435	569	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	570	OopClosure* f);
twisti@1918	571	void oops_do(OopClosure* f) { oops_do(f, false); }
johnc@5548	572	void oops_do(OopClosure* f, bool allow_zombie);
jrose@1424	573	bool detect_scavenge_root_oops();
jrose@1424	574	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	575
jrose@1424	576	bool test_set_oops_do_mark();
jrose@1424	577	static void oops_do_marking_prologue();
jrose@1424	578	static void oops_do_marking_epilogue();
jrose@1424	579	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
johnc@3689	580	bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }
duke@435	581
duke@435	582	// ScopeDesc for an instruction
duke@435	583	ScopeDesc* scope_desc_at(address pc);
duke@435	584
duke@435	585	private:
duke@435	586	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	587
twisti@1639	588	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	589
duke@435	590	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	591
duke@435	592	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	593	PcDesc* desc = _pc_desc_cache.last_pc_desc();
twisti@2103	594	if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
duke@435	595	return desc;
duke@435	596	}
duke@435	597	return find_pc_desc_internal(pc, approximate);
duke@435	598	}
duke@435	599
duke@435	600	public:
duke@435	601	// ScopeDesc retrieval operation
duke@435	602	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	603	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	604	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	605
duke@435	606	public:
duke@435	607	// copying of debugging information
duke@435	608	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	609	void copy_scopes_data(address buffer, int size);
duke@435	610
twisti@1639	611	// Deopt
twisti@1639	612	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	613	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	614	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	615	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	616	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	617	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	618	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	619
twisti@1639	620	static address get_deopt_original_pc(const frame* fr);
twisti@1639	621
twisti@1570	622	// MethodHandle
twisti@1570	623	bool is_method_handle_return(address return_pc);
twisti@1570	624
duke@435	625	// jvmti support:
duke@435	626	void post_compiled_method_load_event();
never@1971	627	jmethodID get_and_cache_jmethod_id();
duke@435	628
duke@435	629	// verify operations
duke@435	630	void verify();
duke@435	631	void verify_scopes();
duke@435	632	void verify_interrupt_point(address interrupt_point);
duke@435	633
duke@435	634	// printing support
jrose@535	635	void print() const;
jrose@535	636	void print_code();
duke@435	637	void print_relocations() PRODUCT_RETURN;
duke@435	638	void print_pcs() PRODUCT_RETURN;
duke@435	639	void print_scopes() PRODUCT_RETURN;
duke@435	640	void print_dependencies() PRODUCT_RETURN;
duke@435	641	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	642	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	643	void print_handler_table() PRODUCT_RETURN;
duke@435	644	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	645	void print_nmethod(bool print_code);
duke@435	646
bobv@2036	647	// need to re-define this from CodeBlob else the overload hides it
bobv@2036	648	virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
twisti@2687	649	void print_on(outputStream* st, const char* msg) const;
duke@435	650
duke@435	651	// Logging
duke@435	652	void log_identity(xmlStream* log) const;
duke@435	653	void log_new_nmethod() const;
never@1544	654	void log_state_change() const;
duke@435	655
jrose@1590	656	// Prints block-level comments, including nmethod specific block labels:
kvn@4107	657	virtual void print_block_comment(outputStream* stream, address block_begin) const {
jrose@1590	658	print_nmethod_labels(stream, block_begin);
jrose@1590	659	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	660	}
kvn@4107	661	void print_nmethod_labels(outputStream* stream, address block_begin) const;
jrose@1590	662
duke@435	663	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	664	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	665	static void print_statistics() PRODUCT_RETURN;
duke@435	666
duke@435	667	// Compiler task identification. Note that all OSR methods
duke@435	668	// are numbered in an independent sequence if CICountOSR is true,
duke@435	669	// and native method wrappers are also numbered independently if
duke@435	670	// CICountNative is true.
duke@435	671	int compile_id() const { return _compile_id; }
duke@435	672	const char* compile_kind() const;
duke@435	673
duke@435	674	// For debugging
duke@435	675	// CompiledIC* IC_at(char* p) const;
duke@435	676	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	677	oop embeddedOop_at(address p);
duke@435	678
duke@435	679	// tells if any of this method's dependencies have been invalidated
duke@435	680	// (this is expensive!)
duke@435	681	bool check_all_dependencies();
duke@435	682
duke@435	683	// tells if this compiled method is dependent on the given changes,
duke@435	684	// and the changes have invalidated it
duke@435	685	bool check_dependency_on(DepChange& changes);
duke@435	686
duke@435	687	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	688	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	689	// this compiled method will have to be deoptimized.
coleenp@4037	690	bool is_evol_dependent_on(Klass* dependee);
duke@435	691
duke@435	692	// Fast breakpoint support. Tells if this compiled method is
duke@435	693	// dependent on the given method. Returns true if this nmethod
duke@435	694	// corresponds to the given method as well.
coleenp@4037	695	bool is_dependent_on_method(Method* dependee);
duke@435	696
duke@435	697	// is it ok to patch at address?
duke@435	698	bool is_patchable_at(address instr_address);
duke@435	699
duke@435	700	// UseBiasedLocking support
kamg@2361	701	ByteSize native_receiver_sp_offset() {
kamg@2361	702	return _native_receiver_sp_offset;
duke@435	703	}
kamg@2361	704	ByteSize native_basic_lock_sp_offset() {
kamg@2361	705	return _native_basic_lock_sp_offset;
duke@435	706	}
duke@435	707
duke@435	708	// support for code generation
duke@435	709	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	710	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	711	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	712
coleenp@4037	713	// RedefineClasses support. Mark metadata in nmethods as on_stack so that
coleenp@4037	714	// redefine classes doesn't purge it.
coleenp@4037	715	static void mark_on_stack(nmethod* nm) {
coleenp@4037	716	nm->metadata_do(Metadata::mark_on_stack);
coleenp@4037	717	}
coleenp@4037	718	void metadata_do(void f(Metadata*));
duke@435	719	};
duke@435	720
dcubed@2624	721	// Locks an nmethod so its code will not get removed and it will not
dcubed@2624	722	// be made into a zombie, even if it is a not_entrant method. After the
dcubed@2624	723	// nmethod becomes a zombie, if CompiledMethodUnload event processing
dcubed@2624	724	// needs to be done, then lock_nmethod() is used directly to keep the
dcubed@2624	725	// generated code from being reused too early.
duke@435	726	class nmethodLocker : public StackObj {
duke@435	727	nmethod* _nm;
duke@435	728
kamg@2511	729	public:
kamg@2511	730
dcubed@2624	731	// note: nm can be NULL
dcubed@2624	732	// Only JvmtiDeferredEvent::compiled_method_unload_event()
dcubed@2624	733	// should pass zombie_ok == true.
dcubed@2624	734	static void lock_nmethod(nmethod* nm, bool zombie_ok = false);
duke@435	735	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	736
duke@435	737	nmethodLocker(address pc); // derive nm from pc
duke@435	738	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	739	nmethodLocker() { _nm = NULL; }
duke@435	740	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	741
duke@435	742	nmethod* code() { return _nm; }
duke@435	743	void set_code(nmethod* new_nm) {
duke@435	744	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	745	_nm = new_nm;
duke@435	746	lock_nmethod(_nm);
duke@435	747	}
duke@435	748	};
stefank@2314	749
stefank@2314	750	#endif // SHARE_VM_CODE_NMETHOD_HPP