• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/code/nmethod.hpp@46a56fac55c7 (annotated)

src/share/vm/code/nmethod.hpp

Tue, 15 Mar 2011 06:37:31 -0700

author

dcubed

date

Tue, 15 Mar 2011 06:37:31 -0700

changeset 2624

46a56fac55c7

parent 2603

1b4e6a5d98e0

child 2625

65f880e2869b

permissions

-rw-r--r--

7024970: 2/3 assert(ServiceThread::is_service_thread(Thread::current())) failed: Service thread must post enqueue
Summary: Change nmethod_lock() to also prevent zombification of the nmethod. CompiledMethodUnload events also need to lock the nmethod. Clean ups in nmethod::make_not_entrant_or_zombie()
Reviewed-by: dholmes, kamg, never, dsamersoff, ysr, coleenp, acorn

duke@435	1	/*
kamg@2511	2	* Copyright (c) 1997, 2011, 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"
stefank@2314	30
duke@435	31	// This class is used internally by nmethods, to cache
duke@435	32	// exception/pc/handler information.
duke@435	33
duke@435	34	class ExceptionCache : public CHeapObj {
duke@435	35	friend class VMStructs;
duke@435	36	private:
duke@435	37	enum { cache_size = 16 };
duke@435	38	klassOop _exception_type;
duke@435	39	address _pc[cache_size];
duke@435	40	address _handler[cache_size];
duke@435	41	int _count;
duke@435	42	ExceptionCache* _next;
duke@435	43
duke@435	44	address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
duke@435	45	void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
duke@435	46	address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
duke@435	47	void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
duke@435	48	int count() { return _count; }
duke@435	49	void increment_count() { _count++; }
duke@435	50
duke@435	51	public:
duke@435	52
duke@435	53	ExceptionCache(Handle exception, address pc, address handler);
duke@435	54
duke@435	55	klassOop exception_type() { return _exception_type; }
duke@435	56	klassOop* exception_type_addr() { 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* _last_pc_desc; // most recent pc_desc found
duke@435	73	PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
duke@435	74	public:
duke@435	75	PcDescCache() { debug_only(_last_pc_desc = NULL); }
duke@435	76	void reset_to(PcDesc* initial_pc_desc);
duke@435	77	PcDesc* find_pc_desc(int pc_offset, bool approximate);
duke@435	78	void add_pc_desc(PcDesc* pc_desc);
duke@435	79	PcDesc* last_pc_desc() { return _last_pc_desc; }
duke@435	80	};
duke@435	81
duke@435	82
duke@435	83	// nmethods (native methods) are the compiled code versions of Java methods.
never@1999	84	//
never@1999	85	// An nmethod contains:
duke@435	86	// - header (the nmethod structure)
duke@435	87	// [Relocation]
duke@435	88	// - relocation information
duke@435	89	// - constant part (doubles, longs and floats used in nmethod)
twisti@1918	90	// - oop table
duke@435	91	// [Code]
duke@435	92	// - code body
duke@435	93	// - exception handler
duke@435	94	// - stub code
duke@435	95	// [Debugging information]
duke@435	96	// - oop array
duke@435	97	// - data array
duke@435	98	// - pcs
duke@435	99	// [Exception handler table]
duke@435	100	// - handler entry point array
duke@435	101	// [Implicit Null Pointer exception table]
duke@435	102	// - implicit null table array
duke@435	103
duke@435	104	class Dependencies;
duke@435	105	class ExceptionHandlerTable;
duke@435	106	class ImplicitExceptionTable;
duke@435	107	class AbstractCompiler;
duke@435	108	class xmlStream;
duke@435	109
duke@435	110	class nmethod : public CodeBlob {
duke@435	111	friend class VMStructs;
duke@435	112	friend class NMethodSweeper;
jrose@1424	113	friend class CodeCache; // non-perm oops
duke@435	114	private:
duke@435	115	// Shared fields for all nmethod's
duke@435	116	methodOop _method;
duke@435	117	int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
never@1971	118	jmethodID _jmethod_id; // Cache of method()->jmethod_id()
duke@435	119
jrose@1424	120	// To support simple linked-list chaining of nmethods:
jrose@1424	121	nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
jrose@1424	122	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
kvn@1637	123	nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
jrose@1424	124
jrose@1424	125	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	126	nmethod* volatile _oops_do_mark_link;
duke@435	127
duke@435	128	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	129
never@1999	130	// offsets for entry points
never@1999	131	address _entry_point; // entry point with class check
never@1999	132	address _verified_entry_point; // entry point without class check
never@1999	133	address _osr_entry_point; // entry point for on stack replacement
never@1999	134
duke@435	135	// Offsets for different nmethod parts
duke@435	136	int _exception_offset;
twisti@1639	137	// All deoptee's will resume execution at this location described by
twisti@1639	138	// this offset.
duke@435	139	int _deoptimize_offset;
twisti@1639	140	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	141	// at this location described by this offset.
twisti@1639	142	int _deoptimize_mh_offset;
never@1813	143	// Offset of the unwind handler if it exists
never@1813	144	int _unwind_handler_offset;
never@1813	145
kamg@551	146	#ifdef HAVE_DTRACE_H
kamg@551	147	int _trap_offset;
kamg@551	148	#endif // def HAVE_DTRACE_H
twisti@2117	149	int _consts_offset;
duke@435	150	int _stub_offset;
twisti@1918	151	int _oops_offset; // offset to where embedded oop table begins (inside data)
duke@435	152	int _scopes_data_offset;
duke@435	153	int _scopes_pcs_offset;
duke@435	154	int _dependencies_offset;
duke@435	155	int _handler_table_offset;
duke@435	156	int _nul_chk_table_offset;
duke@435	157	int _nmethod_end_offset;
duke@435	158
duke@435	159	// location in frame (offset for sp) that deopt can store the original
duke@435	160	// pc during a deopt.
duke@435	161	int _orig_pc_offset;
duke@435	162
never@1999	163	int _compile_id; // which compilation made this nmethod
never@1999	164	int _comp_level; // compilation level
duke@435	165
never@1999	166	// protected by CodeCache_lock
never@1999	167	bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
never@1999	168	bool _speculatively_disconnected; // Marked for potential unload
duke@435	169
never@1999	170	bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
never@1999	171	bool _marked_for_deoptimization; // Used for stack deoptimization
never@1999	172
never@1999	173	// used by jvmti to track if an unload event has been posted for this nmethod.
never@1999	174	bool _unload_reported;
never@1999	175
never@1999	176	// set during construction
never@1999	177	unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
never@1999	178	unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
never@1999	179
never@1999	180	// Protected by Patching_lock
never@1999	181	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
duke@435	195	NOT_PRODUCT(bool _has_debug_info; )
duke@435	196
dcubed@2624	197	// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
dcubed@2624	198	// and is not made into a zombie. However, once the nmethod is made into
dcubed@2624	199	// a zombie, it will be locked one final time if CompiledMethodUnload
dcubed@2624	200	// event processing needs to be done.
duke@435	201	jint _lock_count;
duke@435	202
duke@435	203	// not_entrant method removal. Each mark_sweep pass will update
duke@435	204	// this mark to current sweep invocation count if it is seen on the
duke@435	205	// stack. An not_entrant method can be removed when there is no
duke@435	206	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	207	// current sweep traversal index.
duke@435	208	long _stack_traversal_mark;
duke@435	209
duke@435	210	ExceptionCache *_exception_cache;
duke@435	211	PcDescCache _pc_desc_cache;
duke@435	212
kamg@2361	213	// These are used for compiled synchronized native methods to
duke@435	214	// locate the owner and stack slot for the BasicLock so that we can
duke@435	215	// properly revoke the bias of the owner if necessary. They are
duke@435	216	// needed because there is no debug information for compiled native
duke@435	217	// wrappers and the oop maps are insufficient to allow
duke@435	218	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	219	// to be byte offsets from the Java stack pointer for maximum code
duke@435	220	// sharing between platforms. Note that currently biased locking
duke@435	221	// will never cause Class instances to be biased but this code
duke@435	222	// handles the static synchronized case as well.
kamg@2361	223	// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
kamg@2361	224	// for non-static native wrapper frames.
kamg@2361	225	ByteSize _native_receiver_sp_offset;
kamg@2361	226	ByteSize _native_basic_lock_sp_offset;
duke@435	227
duke@435	228	friend class nmethodLocker;
duke@435	229
duke@435	230	// For native wrappers
duke@435	231	nmethod(methodOop method,
duke@435	232	int nmethod_size,
duke@435	233	CodeOffsets* offsets,
duke@435	234	CodeBuffer *code_buffer,
duke@435	235	int frame_size,
duke@435	236	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	237	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	238	OopMapSet* oop_maps);
duke@435	239
kamg@551	240	#ifdef HAVE_DTRACE_H
kamg@551	241	// For native wrappers
kamg@551	242	nmethod(methodOop method,
kamg@551	243	int nmethod_size,
kamg@551	244	CodeOffsets* offsets,
kamg@551	245	CodeBuffer *code_buffer,
kamg@551	246	int frame_size);
kamg@551	247	#endif // def HAVE_DTRACE_H
kamg@551	248
duke@435	249	// Creation support
duke@435	250	nmethod(methodOop method,
duke@435	251	int nmethod_size,
duke@435	252	int compile_id,
duke@435	253	int entry_bci,
duke@435	254	CodeOffsets* offsets,
duke@435	255	int orig_pc_offset,
duke@435	256	DebugInformationRecorder *recorder,
duke@435	257	Dependencies* dependencies,
duke@435	258	CodeBuffer *code_buffer,
duke@435	259	int frame_size,
duke@435	260	OopMapSet* oop_maps,
duke@435	261	ExceptionHandlerTable* handler_table,
duke@435	262	ImplicitExceptionTable* nul_chk_table,
duke@435	263	AbstractCompiler* compiler,
duke@435	264	int comp_level);
duke@435	265
duke@435	266	// helper methods
duke@435	267	void* operator new(size_t size, int nmethod_size);
duke@435	268
duke@435	269	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	270	// Returns true if this thread changed the state of the nmethod or
never@1544	271	// false if another thread performed the transition.
never@1576	272	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	273	void inc_decompile_count();
duke@435	274
duke@435	275	// Used to manipulate the exception cache
duke@435	276	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	277	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	278
duke@435	279	// Inform external interfaces that a compiled method has been unloaded
never@1999	280	void post_compiled_method_unload();
never@1999	281
never@1999	282	// Initailize fields to their default values
never@1999	283	void init_defaults();
duke@435	284
duke@435	285	public:
duke@435	286	// create nmethod with entry_bci
duke@435	287	static nmethod* new_nmethod(methodHandle method,
duke@435	288	int compile_id,
duke@435	289	int entry_bci,
duke@435	290	CodeOffsets* offsets,
duke@435	291	int orig_pc_offset,
duke@435	292	DebugInformationRecorder* recorder,
duke@435	293	Dependencies* dependencies,
duke@435	294	CodeBuffer *code_buffer,
duke@435	295	int frame_size,
duke@435	296	OopMapSet* oop_maps,
duke@435	297	ExceptionHandlerTable* handler_table,
duke@435	298	ImplicitExceptionTable* nul_chk_table,
duke@435	299	AbstractCompiler* compiler,
duke@435	300	int comp_level);
duke@435	301
duke@435	302	static nmethod* new_native_nmethod(methodHandle method,
duke@435	303	CodeBuffer *code_buffer,
duke@435	304	int vep_offset,
duke@435	305	int frame_complete,
duke@435	306	int frame_size,
duke@435	307	ByteSize receiver_sp_offset,
duke@435	308	ByteSize basic_lock_sp_offset,
duke@435	309	OopMapSet* oop_maps);
duke@435	310
kamg@551	311	#ifdef HAVE_DTRACE_H
kamg@551	312	// The method we generate for a dtrace probe has to look
kamg@551	313	// like an nmethod as far as the rest of the system is concerned
kamg@551	314	// which is somewhat unfortunate.
kamg@551	315	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	316	CodeBuffer *code_buffer,
kamg@551	317	int vep_offset,
kamg@551	318	int trap_offset,
kamg@551	319	int frame_complete,
kamg@551	320	int frame_size);
kamg@551	321
kamg@551	322	int trap_offset() const { return _trap_offset; }
twisti@2103	323	address trap_address() const { return insts_begin() + _trap_offset; }
kamg@551	324
kamg@551	325	#endif // def HAVE_DTRACE_H
kamg@551	326
duke@435	327	// accessors
duke@435	328	methodOop method() const { return _method; }
duke@435	329	AbstractCompiler* compiler() const { return _compiler; }
duke@435	330
duke@435	331	#ifndef PRODUCT
duke@435	332	bool has_debug_info() const { return _has_debug_info; }
duke@435	333	void set_has_debug_info(bool f) { _has_debug_info = false; }
duke@435	334	#endif // NOT PRODUCT
duke@435	335
duke@435	336	// type info
duke@435	337	bool is_nmethod() const { return true; }
duke@435	338	bool is_java_method() const { return !method()->is_native(); }
duke@435	339	bool is_native_method() const { return method()->is_native(); }
duke@435	340	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	341
duke@435	342	bool is_compiled_by_c1() const;
duke@435	343	bool is_compiled_by_c2() const;
twisti@2047	344	bool is_compiled_by_shark() const;
duke@435	345
duke@435	346	// boundaries for different parts
twisti@2117	347	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@2117	348	address consts_end () const { return header_begin() + code_offset() ; }
twisti@2117	349	address insts_begin () const { return header_begin() + code_offset() ; }
twisti@2103	350	address insts_end () const { return header_begin() + _stub_offset ; }
twisti@2117	351	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@2117	352	address stub_end () const { return header_begin() + _oops_offset ; }
twisti@1639	353	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	354	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	355	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	356	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1918	357	oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
twisti@1918	358	oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
twisti@1918	359
twisti@1639	360	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	361	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	362	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	363	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	364	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	365	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	366	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	367	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	368	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	369	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	370
twisti@1918	371	// Sizes
twisti@2117	372	int consts_size () const { return consts_end () - consts_begin (); }
twisti@2103	373	int insts_size () const { return insts_end () - insts_begin (); }
twisti@1918	374	int stub_size () const { return stub_end () - stub_begin (); }
twisti@1918	375	int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
twisti@1918	376	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
twisti@1918	377	int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
twisti@1918	378	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
twisti@1918	379	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
twisti@1918	380	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	381
duke@435	382	int total_size () const;
duke@435	383
twisti@1918	384	// Containment
twisti@2117	385	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
twisti@2103	386	bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
duke@435	387	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
twisti@1918	388	bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
duke@435	389	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	390	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	391	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	392	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	393
duke@435	394	// entry points
duke@435	395	address entry_point() const { return _entry_point; } // normal entry point
duke@435	396	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	397
duke@435	398	// flag accessing and manipulation
never@1999	399	bool is_in_use() const { return _state == alive; }
never@1999	400	bool is_alive() const { return _state == alive || _state == not_entrant; }
never@1999	401	bool is_not_entrant() const { return _state == not_entrant; }
never@1999	402	bool is_zombie() const { return _state == zombie; }
never@1999	403	bool is_unloaded() const { return _state == unloaded; }
duke@435	404
never@1544	405	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	406	// alive. It is used when an uncommon trap happens. Returns true
never@1544	407	// if this thread changed the state of the nmethod or false if
never@1544	408	// another thread performed the transition.
never@1544	409	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
never@1544	410	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	411
duke@435	412	// used by jvmti to track if the unload event has been reported
duke@435	413	bool unload_reported() { return _unload_reported; }
duke@435	414	void set_unload_reported() { _unload_reported = true; }
duke@435	415
never@1999	416	bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
never@1999	417	void mark_for_deoptimization() { _marked_for_deoptimization = true; }
duke@435	418
duke@435	419	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	420
duke@435	421	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	422	void flush_dependencies(BoolObjectClosure* is_alive);
never@1999	423	bool has_flushed_dependencies() { return _has_flushed_dependencies; }
never@1999	424	void set_has_flushed_dependencies() {
duke@435	425	assert(!has_flushed_dependencies(), "should only happen once");
never@1999	426	_has_flushed_dependencies = 1;
duke@435	427	}
duke@435	428
never@1999	429	bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
never@1999	430	void mark_for_reclamation() { _marked_for_reclamation = 1; }
duke@435	431
never@1999	432	bool has_unsafe_access() const { return _has_unsafe_access; }
never@1999	433	void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
duke@435	434
never@1999	435	bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
never@1999	436	void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
twisti@1570	437
never@1999	438	bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
never@1999	439	void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
kvn@1637	440
duke@435	441	int comp_level() const { return _comp_level; }
duke@435	442
twisti@1918	443	// Support for oops in scopes and relocs:
twisti@1918	444	// Note: index 0 is reserved for null.
twisti@1918	445	oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
twisti@1918	446	oop* oop_addr_at(int index) const { // for GC
twisti@1918	447	// relocation indexes are biased by 1 (because 0 is reserved)
twisti@1918	448	assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
never@2081	449	assert(!_oops_are_stale, "oops are stale");
twisti@1918	450	return &oops_begin()[index - 1];
twisti@1918	451	}
twisti@1918	452
twisti@1918	453	void copy_oops(GrowableArray<jobject>* oops);
twisti@1918	454
twisti@1918	455	// Relocation support
twisti@1918	456	private:
twisti@1918	457	void fix_oop_relocations(address begin, address end, bool initialize_immediates);
twisti@1918	458	inline void initialize_immediate_oop(oop* dest, jobject handle);
twisti@1918	459
twisti@1918	460	public:
twisti@1918	461	void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
twisti@1918	462	void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
twisti@1918	463
twisti@1918	464	bool is_at_poll_return(address pc);
twisti@1918	465	bool is_at_poll_or_poll_return(address pc);
twisti@1918	466
jrose@1424	467	// Non-perm oop support
jrose@1424	468	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	469	protected:
jrose@1424	470	enum { npl_on_list = 0x01, npl_marked = 0x10 };
jrose@1424	471	void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
jrose@1424	472	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	473	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	474	#ifndef PRODUCT
jrose@1424	475	void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
jrose@1424	476	void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
jrose@1424	477	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
jrose@1424	478	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	479	#endif //PRODUCT
jrose@1424	480	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	481	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	482
kvn@1637	483	nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
kvn@1637	484	void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
kvn@1637	485
jrose@1424	486	public:
jrose@1424	487
duke@435	488	// Sweeper support
duke@435	489	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	490	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	491
duke@435	492	// Exception cache support
duke@435	493	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	494	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	495	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	496	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435	497	void remove_from_exception_cache(ExceptionCache* ec);
duke@435	498
duke@435	499	// implicit exceptions support
duke@435	500	address continuation_for_implicit_exception(address pc);
duke@435	501
duke@435	502	// On-stack replacement support
duke@435	503	int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
duke@435	504	address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	505	void invalidate_osr_method();
jrose@1424	506	nmethod* osr_link() const { return _osr_link; }
jrose@1424	507	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	508
duke@435	509	// tells whether frames described by this nmethod can be deoptimized
duke@435	510	// note: native wrappers cannot be deoptimized.
duke@435	511	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	512
duke@435	513	// Inline cache support
duke@435	514	void clear_inline_caches();
duke@435	515	void cleanup_inline_caches();
duke@435	516	bool inlinecache_check_contains(address addr) const {
twisti@2103	517	return (addr >= code_begin() && addr < verified_entry_point());
duke@435	518	}
duke@435	519
duke@435	520	// unlink and deallocate this nmethod
duke@435	521	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	522	// expected to use any other private methods/data in this class.
duke@435	523
duke@435	524	protected:
duke@435	525	void flush();
duke@435	526
duke@435	527	public:
dcubed@2624	528	// When true is returned, it is unsafe to remove this nmethod even if
dcubed@2624	529	// it is a zombie, since the VM or the ServiceThread might still be
dcubed@2624	530	// using it.
duke@435	531	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	532
duke@435	533	// See comment at definition of _last_seen_on_stack
duke@435	534	void mark_as_seen_on_stack();
duke@435	535	bool can_not_entrant_be_converted();
duke@435	536
duke@435	537	// Evolution support. We make old (discarded) compiled methods point to new methodOops.
duke@435	538	void set_method(methodOop method) { _method = method; }
duke@435	539
duke@435	540	// GC support
duke@435	541	void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	542	bool unloading_occurred);
duke@435	543	bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	544	oop* root, bool unloading_occurred);
duke@435	545
duke@435	546	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	547	OopClosure* f);
twisti@1918	548	void oops_do(OopClosure* f) { oops_do(f, false); }
twisti@1918	549	void oops_do(OopClosure* f, bool do_strong_roots_only);
jrose@1424	550	bool detect_scavenge_root_oops();
jrose@1424	551	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	552
jrose@1424	553	bool test_set_oops_do_mark();
jrose@1424	554	static void oops_do_marking_prologue();
jrose@1424	555	static void oops_do_marking_epilogue();
jrose@1424	556	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
jrose@1424	557	DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
duke@435	558
duke@435	559	// ScopeDesc for an instruction
duke@435	560	ScopeDesc* scope_desc_at(address pc);
duke@435	561
duke@435	562	private:
duke@435	563	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	564
twisti@1639	565	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	566
duke@435	567	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	568
duke@435	569	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	570	PcDesc* desc = _pc_desc_cache.last_pc_desc();
twisti@2103	571	if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
duke@435	572	return desc;
duke@435	573	}
duke@435	574	return find_pc_desc_internal(pc, approximate);
duke@435	575	}
duke@435	576
duke@435	577	public:
duke@435	578	// ScopeDesc retrieval operation
duke@435	579	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	580	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	581	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	582
duke@435	583	public:
duke@435	584	// copying of debugging information
duke@435	585	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	586	void copy_scopes_data(address buffer, int size);
duke@435	587
twisti@1639	588	// Deopt
twisti@1639	589	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	590	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	591	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	592	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	593	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	594	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	595	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	596
twisti@1639	597	static address get_deopt_original_pc(const frame* fr);
twisti@1639	598
twisti@1570	599	// MethodHandle
twisti@1570	600	bool is_method_handle_return(address return_pc);
twisti@1570	601
duke@435	602	// jvmti support:
duke@435	603	void post_compiled_method_load_event();
never@1971	604	jmethodID get_and_cache_jmethod_id();
duke@435	605
duke@435	606	// verify operations
duke@435	607	void verify();
duke@435	608	void verify_scopes();
duke@435	609	void verify_interrupt_point(address interrupt_point);
duke@435	610
iveresov@2138	611	// print compilation helper
iveresov@2138	612	static void print_compilation(outputStream *st, const char *method_name, const char *title,
iveresov@2138	613	methodOop method, bool is_blocking, int compile_id, int bci, int comp_level);
iveresov@2138	614
duke@435	615	// printing support
jrose@535	616	void print() const;
jrose@535	617	void print_code();
duke@435	618	void print_relocations() PRODUCT_RETURN;
duke@435	619	void print_pcs() PRODUCT_RETURN;
duke@435	620	void print_scopes() PRODUCT_RETURN;
duke@435	621	void print_dependencies() PRODUCT_RETURN;
duke@435	622	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	623	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	624	void print_handler_table() PRODUCT_RETURN;
duke@435	625	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	626	void print_nmethod(bool print_code);
duke@435	627
bobv@2036	628	// need to re-define this from CodeBlob else the overload hides it
bobv@2036	629	virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
duke@435	630	void print_on(outputStream* st, const char* title) const;
duke@435	631
duke@435	632	// Logging
duke@435	633	void log_identity(xmlStream* log) const;
duke@435	634	void log_new_nmethod() const;
never@1544	635	void log_state_change() const;
duke@435	636
jrose@1590	637	// Prints block-level comments, including nmethod specific block labels:
jrose@1590	638	virtual void print_block_comment(outputStream* stream, address block_begin) {
jrose@1590	639	print_nmethod_labels(stream, block_begin);
jrose@1590	640	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	641	}
jrose@1590	642	void print_nmethod_labels(outputStream* stream, address block_begin);
jrose@1590	643
duke@435	644	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	645	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	646	static void print_statistics() PRODUCT_RETURN;
duke@435	647
duke@435	648	// Compiler task identification. Note that all OSR methods
duke@435	649	// are numbered in an independent sequence if CICountOSR is true,
duke@435	650	// and native method wrappers are also numbered independently if
duke@435	651	// CICountNative is true.
duke@435	652	int compile_id() const { return _compile_id; }
duke@435	653	const char* compile_kind() const;
duke@435	654
duke@435	655	// For debugging
duke@435	656	// CompiledIC* IC_at(char* p) const;
duke@435	657	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	658	oop embeddedOop_at(address p);
duke@435	659
duke@435	660	// tells if any of this method's dependencies have been invalidated
duke@435	661	// (this is expensive!)
duke@435	662	bool check_all_dependencies();
duke@435	663
duke@435	664	// tells if this compiled method is dependent on the given changes,
duke@435	665	// and the changes have invalidated it
duke@435	666	bool check_dependency_on(DepChange& changes);
duke@435	667
duke@435	668	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	669	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	670	// this compiled method will have to be deoptimized.
duke@435	671	bool is_evol_dependent_on(klassOop dependee);
duke@435	672
duke@435	673	// Fast breakpoint support. Tells if this compiled method is
duke@435	674	// dependent on the given method. Returns true if this nmethod
duke@435	675	// corresponds to the given method as well.
duke@435	676	bool is_dependent_on_method(methodOop dependee);
duke@435	677
duke@435	678	// is it ok to patch at address?
duke@435	679	bool is_patchable_at(address instr_address);
duke@435	680
duke@435	681	// UseBiasedLocking support
kamg@2361	682	ByteSize native_receiver_sp_offset() {
kamg@2361	683	return _native_receiver_sp_offset;
duke@435	684	}
kamg@2361	685	ByteSize native_basic_lock_sp_offset() {
kamg@2361	686	return _native_basic_lock_sp_offset;
duke@435	687	}
duke@435	688
duke@435	689	// support for code generation
duke@435	690	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	691	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	692	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	693
duke@435	694	};
duke@435	695
dcubed@2624	696	// Locks an nmethod so its code will not get removed and it will not
dcubed@2624	697	// be made into a zombie, even if it is a not_entrant method. After the
dcubed@2624	698	// nmethod becomes a zombie, if CompiledMethodUnload event processing
dcubed@2624	699	// needs to be done, then lock_nmethod() is used directly to keep the
dcubed@2624	700	// generated code from being reused too early.
duke@435	701	class nmethodLocker : public StackObj {
duke@435	702	nmethod* _nm;
duke@435	703
kamg@2511	704	public:
kamg@2511	705
dcubed@2624	706	// note: nm can be NULL
dcubed@2624	707	// Only JvmtiDeferredEvent::compiled_method_unload_event()
dcubed@2624	708	// should pass zombie_ok == true.
dcubed@2624	709	static void lock_nmethod(nmethod* nm, bool zombie_ok = false);
duke@435	710	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	711
duke@435	712	nmethodLocker(address pc); // derive nm from pc
duke@435	713	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	714	nmethodLocker() { _nm = NULL; }
duke@435	715	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	716
duke@435	717	nmethod* code() { return _nm; }
duke@435	718	void set_code(nmethod* new_nm) {
duke@435	719	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	720	_nm = new_nm;
duke@435	721	lock_nmethod(_nm);
duke@435	722	}
duke@435	723	};
stefank@2314	724
stefank@2314	725	#endif // SHARE_VM_CODE_NMETHOD_HPP