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src/share/vm/code/nmethod.hpp@2c6ef90f030a (annotated)

src/share/vm/code/nmethod.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author

stefank

date

Mon, 07 Jul 2014 10:12:40 +0200

changeset 6992

2c6ef90f030a

parent 6983

9717199cb8de

child 7146

aff6ccb506cb

permissions

-rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

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 };
mdoerr@6941	72	// The array elements MUST be volatile! Several threads may modify
mdoerr@6941	73	// and read from the cache concurrently. find_pc_desc_internal has
mdoerr@6941	74	// returned wrong results. C++ compiler (namely xlC12) may duplicate
mdoerr@6941	75	// C++ field accesses if the elements are not volatile.
mdoerr@6941	76	typedef PcDesc* PcDescPtr;
mdoerr@6941	77	volatile PcDescPtr _pc_descs[cache_size]; // last cache_size pc_descs found
duke@435	78	public:
phh@2621	79	PcDescCache() { debug_only(_pc_descs[0] = NULL); }
duke@435	80	void reset_to(PcDesc* initial_pc_desc);
duke@435	81	PcDesc* find_pc_desc(int pc_offset, bool approximate);
duke@435	82	void add_pc_desc(PcDesc* pc_desc);
phh@2621	83	PcDesc* last_pc_desc() { return _pc_descs[0]; }
duke@435	84	};
duke@435	85
duke@435	86
duke@435	87	// nmethods (native methods) are the compiled code versions of Java methods.
never@1999	88	//
never@1999	89	// An nmethod contains:
duke@435	90	// - header (the nmethod structure)
duke@435	91	// [Relocation]
duke@435	92	// - relocation information
duke@435	93	// - constant part (doubles, longs and floats used in nmethod)
twisti@1918	94	// - oop table
duke@435	95	// [Code]
duke@435	96	// - code body
duke@435	97	// - exception handler
duke@435	98	// - stub code
duke@435	99	// [Debugging information]
duke@435	100	// - oop array
duke@435	101	// - data array
duke@435	102	// - pcs
duke@435	103	// [Exception handler table]
duke@435	104	// - handler entry point array
duke@435	105	// [Implicit Null Pointer exception table]
duke@435	106	// - implicit null table array
duke@435	107
duke@435	108	class Dependencies;
duke@435	109	class ExceptionHandlerTable;
duke@435	110	class ImplicitExceptionTable;
duke@435	111	class AbstractCompiler;
duke@435	112	class xmlStream;
duke@435	113
duke@435	114	class nmethod : public CodeBlob {
duke@435	115	friend class VMStructs;
duke@435	116	friend class NMethodSweeper;
jmasa@2909	117	friend class CodeCache; // scavengable oops
duke@435	118	private:
stefank@6992	119
stefank@6992	120	// GC support to help figure out if an nmethod has been
stefank@6992	121	// cleaned/unloaded by the current GC.
stefank@6992	122	static unsigned char _global_unloading_clock;
stefank@6992	123
duke@435	124	// Shared fields for all nmethod's
coleenp@4037	125	Method* _method;
duke@435	126	int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
never@1971	127	jmethodID _jmethod_id; // Cache of method()->jmethod_id()
duke@435	128
jrose@1424	129	// To support simple linked-list chaining of nmethods:
coleenp@4037	130	nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
stefank@6992	131
stefank@6992	132	union {
stefank@6992	133	// Used by G1 to chain nmethods.
stefank@6992	134	nmethod* _unloading_next;
stefank@6992	135	// Used by non-G1 GCs to chain nmethods.
stefank@6992	136	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
stefank@6992	137	};
jrose@1424	138
jrose@1424	139	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	140	nmethod* volatile _oops_do_mark_link;
duke@435	141
duke@435	142	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	143
never@1999	144	// offsets for entry points
never@1999	145	address _entry_point; // entry point with class check
never@1999	146	address _verified_entry_point; // entry point without class check
never@1999	147	address _osr_entry_point; // entry point for on stack replacement
never@1999	148
duke@435	149	// Offsets for different nmethod parts
duke@435	150	int _exception_offset;
twisti@1639	151	// All deoptee's will resume execution at this location described by
twisti@1639	152	// this offset.
duke@435	153	int _deoptimize_offset;
twisti@1639	154	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	155	// at this location described by this offset.
twisti@1639	156	int _deoptimize_mh_offset;
never@1813	157	// Offset of the unwind handler if it exists
never@1813	158	int _unwind_handler_offset;
never@1813	159
kamg@551	160	#ifdef HAVE_DTRACE_H
kamg@551	161	int _trap_offset;
kamg@551	162	#endif // def HAVE_DTRACE_H
twisti@2117	163	int _consts_offset;
duke@435	164	int _stub_offset;
twisti@1918	165	int _oops_offset; // offset to where embedded oop table begins (inside data)
coleenp@4037	166	int _metadata_offset; // embedded meta data table
duke@435	167	int _scopes_data_offset;
duke@435	168	int _scopes_pcs_offset;
duke@435	169	int _dependencies_offset;
duke@435	170	int _handler_table_offset;
duke@435	171	int _nul_chk_table_offset;
duke@435	172	int _nmethod_end_offset;
duke@435	173
duke@435	174	// location in frame (offset for sp) that deopt can store the original
duke@435	175	// pc during a deopt.
duke@435	176	int _orig_pc_offset;
duke@435	177
never@1999	178	int _compile_id; // which compilation made this nmethod
never@1999	179	int _comp_level; // compilation level
duke@435	180
never@1999	181	// protected by CodeCache_lock
never@1999	182	bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
duke@435	183
never@1999	184	bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
never@1999	185	bool _marked_for_deoptimization; // Used for stack deoptimization
never@1999	186
never@1999	187	// used by jvmti to track if an unload event has been posted for this nmethod.
never@1999	188	bool _unload_reported;
never@1999	189
never@1999	190	// set during construction
never@1999	191	unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
never@1999	192	unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
never@3500	193	unsigned int _lazy_critical_native:1; // Lazy JNI critical native
kvn@4103	194	unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints
never@1999	195
never@1999	196	// Protected by Patching_lock
anoll@5792	197	volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded}
never@1999	198
stefank@6992	199	volatile unsigned char _unloading_clock; // Incremented after GC unloaded/cleaned the nmethod
stefank@6992	200
never@2081	201	#ifdef ASSERT
never@2081	202	bool _oops_are_stale; // indicates that it's no longer safe to access oops section
never@2081	203	#endif
never@2081	204
kvn@6172	205	enum { in_use = 0, // executable nmethod
kvn@6172	206	not_entrant = 1, // marked for deoptimization but activations may still exist,
kvn@6172	207	// will be transformed to zombie when all activations are gone
kvn@6172	208	zombie = 2, // no activations exist, nmethod is ready for purge
kvn@6172	209	unloaded = 3 }; // there should be no activations, should not be called,
kvn@6172	210	// will be transformed to zombie immediately
duke@435	211
jrose@1424	212	jbyte _scavenge_root_state;
jrose@1424	213
kvn@6429	214	#if INCLUDE_RTM_OPT
kvn@6429	215	// RTM state at compile time. Used during deoptimization to decide
kvn@6429	216	// whether to restart collecting RTM locking abort statistic again.
kvn@6429	217	RTMState _rtm_state;
kvn@6429	218	#endif
kvn@6429	219
dcubed@2624	220	// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
dcubed@2624	221	// and is not made into a zombie. However, once the nmethod is made into
dcubed@2624	222	// a zombie, it will be locked one final time if CompiledMethodUnload
dcubed@2624	223	// event processing needs to be done.
duke@435	224	jint _lock_count;
duke@435	225
duke@435	226	// not_entrant method removal. Each mark_sweep pass will update
duke@435	227	// this mark to current sweep invocation count if it is seen on the
anoll@5792	228	// stack. An not_entrant method can be removed when there are no
duke@435	229	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	230	// current sweep traversal index.
duke@435	231	long _stack_traversal_mark;
duke@435	232
anoll@5792	233	// The _hotness_counter indicates the hotness of a method. The higher
anoll@5792	234	// the value the hotter the method. The hotness counter of a nmethod is
anoll@5792	235	// set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
anoll@5792	236	// is active while stack scanning (mark_active_nmethods()). The hotness
anoll@5792	237	// counter is decreased (by 1) while sweeping.
anoll@5792	238	int _hotness_counter;
anoll@5792	239
duke@435	240	ExceptionCache *_exception_cache;
duke@435	241	PcDescCache _pc_desc_cache;
duke@435	242
kamg@2361	243	// These are used for compiled synchronized native methods to
duke@435	244	// locate the owner and stack slot for the BasicLock so that we can
duke@435	245	// properly revoke the bias of the owner if necessary. They are
duke@435	246	// needed because there is no debug information for compiled native
duke@435	247	// wrappers and the oop maps are insufficient to allow
duke@435	248	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	249	// to be byte offsets from the Java stack pointer for maximum code
duke@435	250	// sharing between platforms. Note that currently biased locking
duke@435	251	// will never cause Class instances to be biased but this code
duke@435	252	// handles the static synchronized case as well.
kamg@2361	253	// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
kamg@2361	254	// for non-static native wrapper frames.
kamg@2361	255	ByteSize _native_receiver_sp_offset;
kamg@2361	256	ByteSize _native_basic_lock_sp_offset;
duke@435	257
duke@435	258	friend class nmethodLocker;
duke@435	259
duke@435	260	// For native wrappers
coleenp@4037	261	nmethod(Method* method,
duke@435	262	int nmethod_size,
twisti@2687	263	int compile_id,
duke@435	264	CodeOffsets* offsets,
duke@435	265	CodeBuffer *code_buffer,
duke@435	266	int frame_size,
duke@435	267	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	268	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	269	OopMapSet* oop_maps);
duke@435	270
kamg@551	271	#ifdef HAVE_DTRACE_H
kamg@551	272	// For native wrappers
coleenp@4037	273	nmethod(Method* method,
kamg@551	274	int nmethod_size,
kamg@551	275	CodeOffsets* offsets,
kamg@551	276	CodeBuffer *code_buffer,
kamg@551	277	int frame_size);
kamg@551	278	#endif // def HAVE_DTRACE_H
kamg@551	279
duke@435	280	// Creation support
coleenp@4037	281	nmethod(Method* method,
duke@435	282	int nmethod_size,
duke@435	283	int compile_id,
duke@435	284	int entry_bci,
duke@435	285	CodeOffsets* offsets,
duke@435	286	int orig_pc_offset,
duke@435	287	DebugInformationRecorder *recorder,
duke@435	288	Dependencies* dependencies,
duke@435	289	CodeBuffer *code_buffer,
duke@435	290	int frame_size,
duke@435	291	OopMapSet* oop_maps,
duke@435	292	ExceptionHandlerTable* handler_table,
duke@435	293	ImplicitExceptionTable* nul_chk_table,
duke@435	294	AbstractCompiler* compiler,
duke@435	295	int comp_level);
duke@435	296
duke@435	297	// helper methods
coleenp@5614	298	void* operator new(size_t size, int nmethod_size) throw();
duke@435	299
duke@435	300	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	301	// Returns true if this thread changed the state of the nmethod or
never@1544	302	// false if another thread performed the transition.
never@1576	303	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	304	void inc_decompile_count();
duke@435	305
duke@435	306	// Used to manipulate the exception cache
duke@435	307	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	308	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	309
duke@435	310	// Inform external interfaces that a compiled method has been unloaded
never@1999	311	void post_compiled_method_unload();
never@1999	312
never@1999	313	// Initailize fields to their default values
never@1999	314	void init_defaults();
duke@435	315
duke@435	316	public:
duke@435	317	// create nmethod with entry_bci
duke@435	318	static nmethod* new_nmethod(methodHandle method,
duke@435	319	int compile_id,
duke@435	320	int entry_bci,
duke@435	321	CodeOffsets* offsets,
duke@435	322	int orig_pc_offset,
duke@435	323	DebugInformationRecorder* recorder,
duke@435	324	Dependencies* dependencies,
duke@435	325	CodeBuffer *code_buffer,
duke@435	326	int frame_size,
duke@435	327	OopMapSet* oop_maps,
duke@435	328	ExceptionHandlerTable* handler_table,
duke@435	329	ImplicitExceptionTable* nul_chk_table,
duke@435	330	AbstractCompiler* compiler,
duke@435	331	int comp_level);
duke@435	332
duke@435	333	static nmethod* new_native_nmethod(methodHandle method,
twisti@2687	334	int compile_id,
duke@435	335	CodeBuffer *code_buffer,
duke@435	336	int vep_offset,
duke@435	337	int frame_complete,
duke@435	338	int frame_size,
duke@435	339	ByteSize receiver_sp_offset,
duke@435	340	ByteSize basic_lock_sp_offset,
duke@435	341	OopMapSet* oop_maps);
duke@435	342
kamg@551	343	#ifdef HAVE_DTRACE_H
kamg@551	344	// The method we generate for a dtrace probe has to look
kamg@551	345	// like an nmethod as far as the rest of the system is concerned
kamg@551	346	// which is somewhat unfortunate.
kamg@551	347	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	348	CodeBuffer *code_buffer,
kamg@551	349	int vep_offset,
kamg@551	350	int trap_offset,
kamg@551	351	int frame_complete,
kamg@551	352	int frame_size);
kamg@551	353
kamg@551	354	int trap_offset() const { return _trap_offset; }
twisti@2103	355	address trap_address() const { return insts_begin() + _trap_offset; }
kamg@551	356
kamg@551	357	#endif // def HAVE_DTRACE_H
kamg@551	358
duke@435	359	// accessors
coleenp@4037	360	Method* method() const { return _method; }
duke@435	361	AbstractCompiler* compiler() const { return _compiler; }
duke@435	362
duke@435	363	// type info
duke@435	364	bool is_nmethod() const { return true; }
duke@435	365	bool is_java_method() const { return !method()->is_native(); }
duke@435	366	bool is_native_method() const { return method()->is_native(); }
duke@435	367	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	368
duke@435	369	bool is_compiled_by_c1() const;
duke@435	370	bool is_compiled_by_c2() const;
twisti@2047	371	bool is_compiled_by_shark() const;
duke@435	372
duke@435	373	// boundaries for different parts
twisti@2117	374	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@2117	375	address consts_end () const { return header_begin() + code_offset() ; }
twisti@2117	376	address insts_begin () const { return header_begin() + code_offset() ; }
twisti@2103	377	address insts_end () const { return header_begin() + _stub_offset ; }
twisti@2117	378	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@2117	379	address stub_end () const { return header_begin() + _oops_offset ; }
twisti@1639	380	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	381	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	382	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	383	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1918	384	oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
coleenp@4037	385	oop* oops_end () const { return (oop*) (header_begin() + _metadata_offset) ; }
coleenp@4037	386
coleenp@4037	387	Metadata** metadata_begin () const { return (Metadata**) (header_begin() + _metadata_offset) ; }
coleenp@4037	388	Metadata** metadata_end () const { return (Metadata**) (header_begin() + _scopes_data_offset) ; }
twisti@1918	389
twisti@1639	390	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	391	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	392	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	393	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	394	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	395	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	396	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	397	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	398	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	399	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	400
twisti@1918	401	// Sizes
twisti@2117	402	int consts_size () const { return consts_end () - consts_begin (); }
twisti@2103	403	int insts_size () const { return insts_end () - insts_begin (); }
twisti@1918	404	int stub_size () const { return stub_end () - stub_begin (); }
twisti@1918	405	int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
coleenp@4037	406	int metadata_size () const { return (address) metadata_end () - (address) metadata_begin (); }
twisti@1918	407	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
twisti@1918	408	int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
twisti@1918	409	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
twisti@1918	410	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
twisti@1918	411	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	412
duke@435	413	int total_size () const;
duke@435	414
anoll@5792	415	void dec_hotness_counter() { _hotness_counter--; }
anoll@5792	416	void set_hotness_counter(int val) { _hotness_counter = val; }
anoll@5792	417	int hotness_counter() const { return _hotness_counter; }
anoll@5792	418
twisti@1918	419	// Containment
twisti@2117	420	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
twisti@2103	421	bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
duke@435	422	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
twisti@1918	423	bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
coleenp@4037	424	bool metadata_contains (Metadata** addr) const { return metadata_begin () <= addr && addr < metadata_end (); }
duke@435	425	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	426	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	427	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	428	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	429
duke@435	430	// entry points
duke@435	431	address entry_point() const { return _entry_point; } // normal entry point
duke@435	432	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	433
duke@435	434	// flag accessing and manipulation
kvn@6172	435	bool is_in_use() const { return _state == in_use; }
kvn@6172	436	bool is_alive() const { return _state == in_use || _state == not_entrant; }
never@1999	437	bool is_not_entrant() const { return _state == not_entrant; }
never@1999	438	bool is_zombie() const { return _state == zombie; }
never@1999	439	bool is_unloaded() const { return _state == unloaded; }
duke@435	440
kvn@6429	441	#if INCLUDE_RTM_OPT
kvn@6429	442	// rtm state accessing and manipulating
kvn@6429	443	RTMState rtm_state() const { return _rtm_state; }
kvn@6429	444	void set_rtm_state(RTMState state) { _rtm_state = state; }
kvn@6429	445	#endif
kvn@6429	446
never@1544	447	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	448	// alive. It is used when an uncommon trap happens. Returns true
never@1544	449	// if this thread changed the state of the nmethod or false if
never@1544	450	// another thread performed the transition.
anoll@5792	451	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
anoll@5792	452	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	453
duke@435	454	// used by jvmti to track if the unload event has been reported
duke@435	455	bool unload_reported() { return _unload_reported; }
duke@435	456	void set_unload_reported() { _unload_reported = true; }
duke@435	457
stefank@6992	458	void set_unloading_next(nmethod* next) { _unloading_next = next; }
stefank@6992	459	nmethod* unloading_next() { return _unloading_next; }
stefank@6992	460
stefank@6992	461	static unsigned char global_unloading_clock() { return _global_unloading_clock; }
stefank@6992	462	static void increase_unloading_clock();
stefank@6992	463
stefank@6992	464	void set_unloading_clock(unsigned char unloading_clock);
stefank@6992	465	unsigned char unloading_clock();
stefank@6992	466
never@1999	467	bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
never@1999	468	void mark_for_deoptimization() { _marked_for_deoptimization = true; }
duke@435	469
duke@435	470	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	471
duke@435	472	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	473	void flush_dependencies(BoolObjectClosure* is_alive);
never@1999	474	bool has_flushed_dependencies() { return _has_flushed_dependencies; }
never@1999	475	void set_has_flushed_dependencies() {
duke@435	476	assert(!has_flushed_dependencies(), "should only happen once");
never@1999	477	_has_flushed_dependencies = 1;
duke@435	478	}
duke@435	479
never@1999	480	bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
never@1999	481	void mark_for_reclamation() { _marked_for_reclamation = 1; }
duke@435	482
never@1999	483	bool has_unsafe_access() const { return _has_unsafe_access; }
never@1999	484	void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
duke@435	485
never@1999	486	bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
never@1999	487	void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
twisti@1570	488
never@3500	489	bool is_lazy_critical_native() const { return _lazy_critical_native; }
never@3500	490	void set_lazy_critical_native(bool z) { _lazy_critical_native = z; }
kvn@1637	491
kvn@4103	492	bool has_wide_vectors() const { return _has_wide_vectors; }
kvn@4103	493	void set_has_wide_vectors(bool z) { _has_wide_vectors = z; }
kvn@4103	494
duke@435	495	int comp_level() const { return _comp_level; }
duke@435	496
twisti@1918	497	// Support for oops in scopes and relocs:
twisti@1918	498	// Note: index 0 is reserved for null.
twisti@1918	499	oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
twisti@1918	500	oop* oop_addr_at(int index) const { // for GC
twisti@1918	501	// relocation indexes are biased by 1 (because 0 is reserved)
twisti@1918	502	assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
never@2081	503	assert(!_oops_are_stale, "oops are stale");
twisti@1918	504	return &oops_begin()[index - 1];
twisti@1918	505	}
twisti@1918	506
coleenp@4037	507	// Support for meta data in scopes and relocs:
coleenp@4037	508	// Note: index 0 is reserved for null.
coleenp@4037	509	Metadata* metadata_at(int index) const { return index == 0 ? NULL: *metadata_addr_at(index); }
coleenp@4037	510	Metadata** metadata_addr_at(int index) const { // for GC
coleenp@4037	511	// relocation indexes are biased by 1 (because 0 is reserved)
coleenp@4037	512	assert(index > 0 && index <= metadata_size(), "must be a valid non-zero index");
coleenp@4037	513	return &metadata_begin()[index - 1];
coleenp@4037	514	}
coleenp@4037	515
coleenp@4037	516	void copy_values(GrowableArray<jobject>* oops);
coleenp@4037	517	void copy_values(GrowableArray<Metadata*>* metadata);
twisti@1918	518
twisti@1918	519	// Relocation support
twisti@1918	520	private:
twisti@1918	521	void fix_oop_relocations(address begin, address end, bool initialize_immediates);
twisti@1918	522	inline void initialize_immediate_oop(oop* dest, jobject handle);
twisti@1918	523
twisti@1918	524	public:
twisti@1918	525	void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
twisti@1918	526	void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
never@2657	527	void verify_oop_relocations();
twisti@1918	528
twisti@1918	529	bool is_at_poll_return(address pc);
twisti@1918	530	bool is_at_poll_or_poll_return(address pc);
twisti@1918	531
jmasa@2909	532	// Scavengable oop support
jrose@1424	533	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	534	protected:
jmasa@2909	535	enum { sl_on_list = 0x01, sl_marked = 0x10 };
jmasa@2909	536	void set_on_scavenge_root_list() { _scavenge_root_state = sl_on_list; }
jrose@1424	537	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	538	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	539	#ifndef PRODUCT
jmasa@2909	540	void set_scavenge_root_marked() { _scavenge_root_state |= sl_marked; }
jmasa@2909	541	void clear_scavenge_root_marked() { _scavenge_root_state &= ~sl_marked; }
jmasa@2909	542	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ sl_on_list) == 0; }
jrose@1424	543	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	544	#endif //PRODUCT
jrose@1424	545	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	546	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	547
jrose@1424	548	public:
jrose@1424	549
duke@435	550	// Sweeper support
duke@435	551	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	552	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	553
duke@435	554	// Exception cache support
duke@435	555	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	556	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	557	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	558	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
stefank@6983	559	void clean_exception_cache(BoolObjectClosure* is_alive);
duke@435	560
duke@435	561	// implicit exceptions support
duke@435	562	address continuation_for_implicit_exception(address pc);
duke@435	563
duke@435	564	// On-stack replacement support
twisti@2687	565	int osr_entry_bci() const { assert(is_osr_method(), "wrong kind of nmethod"); return _entry_bci; }
twisti@2687	566	address osr_entry() const { assert(is_osr_method(), "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	567	void invalidate_osr_method();
jrose@1424	568	nmethod* osr_link() const { return _osr_link; }
jrose@1424	569	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	570
duke@435	571	// tells whether frames described by this nmethod can be deoptimized
duke@435	572	// note: native wrappers cannot be deoptimized.
duke@435	573	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	574
duke@435	575	// Inline cache support
duke@435	576	void clear_inline_caches();
duke@435	577	void cleanup_inline_caches();
duke@435	578	bool inlinecache_check_contains(address addr) const {
twisti@2103	579	return (addr >= code_begin() && addr < verified_entry_point());
duke@435	580	}
duke@435	581
stefank@6992	582	// Verify calls to dead methods have been cleaned.
stefank@6992	583	void verify_clean_inline_caches();
stefank@6992	584	// Verify and count cached icholder relocations.
stefank@6992	585	int verify_icholder_relocations();
coleenp@4037	586	// Check that all metadata is still alive
coleenp@4037	587	void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive);
coleenp@4037	588
duke@435	589	// unlink and deallocate this nmethod
duke@435	590	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	591	// expected to use any other private methods/data in this class.
duke@435	592
duke@435	593	protected:
duke@435	594	void flush();
duke@435	595
duke@435	596	public:
dcubed@2624	597	// When true is returned, it is unsafe to remove this nmethod even if
dcubed@2624	598	// it is a zombie, since the VM or the ServiceThread might still be
dcubed@2624	599	// using it.
duke@435	600	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	601
duke@435	602	// See comment at definition of _last_seen_on_stack
duke@435	603	void mark_as_seen_on_stack();
duke@435	604	bool can_not_entrant_be_converted();
duke@435	605
coleenp@4037	606	// Evolution support. We make old (discarded) compiled methods point to new Method*s.
coleenp@4037	607	void set_method(Method* method) { _method = method; }
duke@435	608
duke@435	609	// GC support
brutisso@4098	610	void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
stefank@6992	611	// The parallel versions are used by G1.
stefank@6992	612	bool do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred);
stefank@6992	613	void do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred);
stefank@6992	614	// Unload a nmethod if the *root object is dead.
brutisso@4098	615	bool can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred);
duke@435	616
duke@435	617	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	618	OopClosure* f);
twisti@1918	619	void oops_do(OopClosure* f) { oops_do(f, false); }
johnc@5548	620	void oops_do(OopClosure* f, bool allow_zombie);
jrose@1424	621	bool detect_scavenge_root_oops();
jrose@1424	622	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	623
jrose@1424	624	bool test_set_oops_do_mark();
jrose@1424	625	static void oops_do_marking_prologue();
jrose@1424	626	static void oops_do_marking_epilogue();
jrose@1424	627	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
johnc@3689	628	bool test_oops_do_mark() { return _oops_do_mark_link != NULL; }
duke@435	629
duke@435	630	// ScopeDesc for an instruction
duke@435	631	ScopeDesc* scope_desc_at(address pc);
duke@435	632
duke@435	633	private:
duke@435	634	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	635
twisti@1639	636	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	637
duke@435	638	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	639
duke@435	640	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	641	PcDesc* desc = _pc_desc_cache.last_pc_desc();
twisti@2103	642	if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
duke@435	643	return desc;
duke@435	644	}
duke@435	645	return find_pc_desc_internal(pc, approximate);
duke@435	646	}
duke@435	647
duke@435	648	public:
duke@435	649	// ScopeDesc retrieval operation
duke@435	650	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	651	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	652	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	653
duke@435	654	public:
duke@435	655	// copying of debugging information
duke@435	656	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	657	void copy_scopes_data(address buffer, int size);
duke@435	658
twisti@1639	659	// Deopt
twisti@1639	660	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	661	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	662	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	663	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	664	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	665	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	666	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	667
twisti@1639	668	static address get_deopt_original_pc(const frame* fr);
twisti@1639	669
twisti@1570	670	// MethodHandle
twisti@1570	671	bool is_method_handle_return(address return_pc);
twisti@1570	672
duke@435	673	// jvmti support:
duke@435	674	void post_compiled_method_load_event();
never@1971	675	jmethodID get_and_cache_jmethod_id();
duke@435	676
duke@435	677	// verify operations
duke@435	678	void verify();
duke@435	679	void verify_scopes();
duke@435	680	void verify_interrupt_point(address interrupt_point);
duke@435	681
duke@435	682	// printing support
jrose@535	683	void print() const;
jrose@535	684	void print_code();
duke@435	685	void print_relocations() PRODUCT_RETURN;
duke@435	686	void print_pcs() PRODUCT_RETURN;
duke@435	687	void print_scopes() PRODUCT_RETURN;
duke@435	688	void print_dependencies() PRODUCT_RETURN;
duke@435	689	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	690	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	691	void print_handler_table() PRODUCT_RETURN;
duke@435	692	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	693	void print_nmethod(bool print_code);
duke@435	694
bobv@2036	695	// need to re-define this from CodeBlob else the overload hides it
bobv@2036	696	virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
twisti@2687	697	void print_on(outputStream* st, const char* msg) const;
duke@435	698
duke@435	699	// Logging
duke@435	700	void log_identity(xmlStream* log) const;
duke@435	701	void log_new_nmethod() const;
never@1544	702	void log_state_change() const;
duke@435	703
jrose@1590	704	// Prints block-level comments, including nmethod specific block labels:
kvn@4107	705	virtual void print_block_comment(outputStream* stream, address block_begin) const {
jrose@1590	706	print_nmethod_labels(stream, block_begin);
jrose@1590	707	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	708	}
kvn@4107	709	void print_nmethod_labels(outputStream* stream, address block_begin) const;
jrose@1590	710
duke@435	711	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	712	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	713	static void print_statistics() PRODUCT_RETURN;
duke@435	714
duke@435	715	// Compiler task identification. Note that all OSR methods
duke@435	716	// are numbered in an independent sequence if CICountOSR is true,
duke@435	717	// and native method wrappers are also numbered independently if
duke@435	718	// CICountNative is true.
duke@435	719	int compile_id() const { return _compile_id; }
duke@435	720	const char* compile_kind() const;
duke@435	721
duke@435	722	// For debugging
duke@435	723	// CompiledIC* IC_at(char* p) const;
duke@435	724	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	725	oop embeddedOop_at(address p);
duke@435	726
duke@435	727	// tells if any of this method's dependencies have been invalidated
duke@435	728	// (this is expensive!)
duke@435	729	bool check_all_dependencies();
duke@435	730
duke@435	731	// tells if this compiled method is dependent on the given changes,
duke@435	732	// and the changes have invalidated it
duke@435	733	bool check_dependency_on(DepChange& changes);
duke@435	734
duke@435	735	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	736	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	737	// this compiled method will have to be deoptimized.
coleenp@4037	738	bool is_evol_dependent_on(Klass* dependee);
duke@435	739
duke@435	740	// Fast breakpoint support. Tells if this compiled method is
duke@435	741	// dependent on the given method. Returns true if this nmethod
duke@435	742	// corresponds to the given method as well.
coleenp@4037	743	bool is_dependent_on_method(Method* dependee);
duke@435	744
duke@435	745	// is it ok to patch at address?
duke@435	746	bool is_patchable_at(address instr_address);
duke@435	747
duke@435	748	// UseBiasedLocking support
kamg@2361	749	ByteSize native_receiver_sp_offset() {
kamg@2361	750	return _native_receiver_sp_offset;
duke@435	751	}
kamg@2361	752	ByteSize native_basic_lock_sp_offset() {
kamg@2361	753	return _native_basic_lock_sp_offset;
duke@435	754	}
duke@435	755
duke@435	756	// support for code generation
duke@435	757	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	758	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	759	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	760
coleenp@4037	761	// RedefineClasses support. Mark metadata in nmethods as on_stack so that
coleenp@4037	762	// redefine classes doesn't purge it.
coleenp@4037	763	static void mark_on_stack(nmethod* nm) {
coleenp@4037	764	nm->metadata_do(Metadata::mark_on_stack);
coleenp@4037	765	}
coleenp@4037	766	void metadata_do(void f(Metadata*));
duke@435	767	};
duke@435	768
dcubed@2624	769	// Locks an nmethod so its code will not get removed and it will not
dcubed@2624	770	// be made into a zombie, even if it is a not_entrant method. After the
dcubed@2624	771	// nmethod becomes a zombie, if CompiledMethodUnload event processing
dcubed@2624	772	// needs to be done, then lock_nmethod() is used directly to keep the
dcubed@2624	773	// generated code from being reused too early.
duke@435	774	class nmethodLocker : public StackObj {
duke@435	775	nmethod* _nm;
duke@435	776
kamg@2511	777	public:
kamg@2511	778
dcubed@2624	779	// note: nm can be NULL
dcubed@2624	780	// Only JvmtiDeferredEvent::compiled_method_unload_event()
dcubed@2624	781	// should pass zombie_ok == true.
dcubed@2624	782	static void lock_nmethod(nmethod* nm, bool zombie_ok = false);
duke@435	783	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	784
duke@435	785	nmethodLocker(address pc); // derive nm from pc
duke@435	786	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	787	nmethodLocker() { _nm = NULL; }
duke@435	788	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	789
duke@435	790	nmethod* code() { return _nm; }
duke@435	791	void set_code(nmethod* new_nm) {
duke@435	792	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	793	_nm = new_nm;
duke@435	794	lock_nmethod(_nm);
duke@435	795	}
duke@435	796	};
stefank@2314	797
stefank@2314	798	#endif // SHARE_VM_CODE_NMETHOD_HPP