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src/share/vm/code/nmethod.hpp@65f880e2869b (annotated)

src/share/vm/code/nmethod.hpp

Tue, 15 Mar 2011 06:50:01 -0700

author

dcubed

date

Tue, 15 Mar 2011 06:50:01 -0700

changeset 2625

65f880e2869b

parent 2621

3d5a546351ef

parent 2624

46a56fac55c7

child 2657

d673ef06fe96

permissions

-rw-r--r--

Merge

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* _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;
jrose@1424	112	friend class CodeCache; // non-perm oops
duke@435	113	private:
duke@435	114	// Shared fields for all nmethod's
duke@435	115	methodOop _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:
jrose@1424	120	nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
jrose@1424	121	nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
kvn@1637	122	nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
jrose@1424	123
jrose@1424	124	static nmethod* volatile _oops_do_mark_nmethods;
jrose@1424	125	nmethod* volatile _oops_do_mark_link;
duke@435	126
duke@435	127	AbstractCompiler* _compiler; // The compiler which compiled this nmethod
duke@435	128
never@1999	129	// offsets for entry points
never@1999	130	address _entry_point; // entry point with class check
never@1999	131	address _verified_entry_point; // entry point without class check
never@1999	132	address _osr_entry_point; // entry point for on stack replacement
never@1999	133
duke@435	134	// Offsets for different nmethod parts
duke@435	135	int _exception_offset;
twisti@1639	136	// All deoptee's will resume execution at this location described by
twisti@1639	137	// this offset.
duke@435	138	int _deoptimize_offset;
twisti@1639	139	// All deoptee's at a MethodHandle call site will resume execution
twisti@1639	140	// at this location described by this offset.
twisti@1639	141	int _deoptimize_mh_offset;
never@1813	142	// Offset of the unwind handler if it exists
never@1813	143	int _unwind_handler_offset;
never@1813	144
kamg@551	145	#ifdef HAVE_DTRACE_H
kamg@551	146	int _trap_offset;
kamg@551	147	#endif // def HAVE_DTRACE_H
twisti@2117	148	int _consts_offset;
duke@435	149	int _stub_offset;
twisti@1918	150	int _oops_offset; // offset to where embedded oop table begins (inside data)
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)
never@1999	167	bool _speculatively_disconnected; // Marked for potential unload
duke@435	168
never@1999	169	bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
never@1999	170	bool _marked_for_deoptimization; // Used for stack deoptimization
never@1999	171
never@1999	172	// used by jvmti to track if an unload event has been posted for this nmethod.
never@1999	173	bool _unload_reported;
never@1999	174
never@1999	175	// set during construction
never@1999	176	unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
never@1999	177	unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
never@1999	178
never@1999	179	// Protected by Patching_lock
phh@2621	180	unsigned char _state; // {alive, not_entrant, zombie, unloaded}
never@1999	181
never@2081	182	#ifdef ASSERT
never@2081	183	bool _oops_are_stale; // indicates that it's no longer safe to access oops section
never@2081	184	#endif
never@2081	185
duke@435	186	enum { alive = 0,
twisti@1040	187	not_entrant = 1, // uncommon trap has happened but activations may still exist
duke@435	188	zombie = 2,
duke@435	189	unloaded = 3 };
duke@435	190
duke@435	191
jrose@1424	192	jbyte _scavenge_root_state;
jrose@1424	193
duke@435	194	NOT_PRODUCT(bool _has_debug_info; )
duke@435	195
dcubed@2624	196	// Nmethod Flushing lock. If non-zero, then the nmethod is not removed
dcubed@2624	197	// and is not made into a zombie. However, once the nmethod is made into
dcubed@2624	198	// a zombie, it will be locked one final time if CompiledMethodUnload
dcubed@2624	199	// event processing needs to be done.
duke@435	200	jint _lock_count;
duke@435	201
duke@435	202	// not_entrant method removal. Each mark_sweep pass will update
duke@435	203	// this mark to current sweep invocation count if it is seen on the
duke@435	204	// stack. An not_entrant method can be removed when there is no
duke@435	205	// more activations, i.e., when the _stack_traversal_mark is less than
duke@435	206	// current sweep traversal index.
duke@435	207	long _stack_traversal_mark;
duke@435	208
duke@435	209	ExceptionCache *_exception_cache;
duke@435	210	PcDescCache _pc_desc_cache;
duke@435	211
kamg@2361	212	// These are used for compiled synchronized native methods to
duke@435	213	// locate the owner and stack slot for the BasicLock so that we can
duke@435	214	// properly revoke the bias of the owner if necessary. They are
duke@435	215	// needed because there is no debug information for compiled native
duke@435	216	// wrappers and the oop maps are insufficient to allow
duke@435	217	// frame::retrieve_receiver() to work. Currently they are expected
duke@435	218	// to be byte offsets from the Java stack pointer for maximum code
duke@435	219	// sharing between platforms. Note that currently biased locking
duke@435	220	// will never cause Class instances to be biased but this code
duke@435	221	// handles the static synchronized case as well.
kamg@2361	222	// JVMTI's GetLocalInstance() also uses these offsets to find the receiver
kamg@2361	223	// for non-static native wrapper frames.
kamg@2361	224	ByteSize _native_receiver_sp_offset;
kamg@2361	225	ByteSize _native_basic_lock_sp_offset;
duke@435	226
duke@435	227	friend class nmethodLocker;
duke@435	228
duke@435	229	// For native wrappers
duke@435	230	nmethod(methodOop method,
duke@435	231	int nmethod_size,
duke@435	232	CodeOffsets* offsets,
duke@435	233	CodeBuffer *code_buffer,
duke@435	234	int frame_size,
duke@435	235	ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
duke@435	236	ByteSize basic_lock_sp_offset, /* synchronized natives only */
duke@435	237	OopMapSet* oop_maps);
duke@435	238
kamg@551	239	#ifdef HAVE_DTRACE_H
kamg@551	240	// For native wrappers
kamg@551	241	nmethod(methodOop method,
kamg@551	242	int nmethod_size,
kamg@551	243	CodeOffsets* offsets,
kamg@551	244	CodeBuffer *code_buffer,
kamg@551	245	int frame_size);
kamg@551	246	#endif // def HAVE_DTRACE_H
kamg@551	247
duke@435	248	// Creation support
duke@435	249	nmethod(methodOop method,
duke@435	250	int nmethod_size,
duke@435	251	int compile_id,
duke@435	252	int entry_bci,
duke@435	253	CodeOffsets* offsets,
duke@435	254	int orig_pc_offset,
duke@435	255	DebugInformationRecorder *recorder,
duke@435	256	Dependencies* dependencies,
duke@435	257	CodeBuffer *code_buffer,
duke@435	258	int frame_size,
duke@435	259	OopMapSet* oop_maps,
duke@435	260	ExceptionHandlerTable* handler_table,
duke@435	261	ImplicitExceptionTable* nul_chk_table,
duke@435	262	AbstractCompiler* compiler,
duke@435	263	int comp_level);
duke@435	264
duke@435	265	// helper methods
duke@435	266	void* operator new(size_t size, int nmethod_size);
duke@435	267
duke@435	268	const char* reloc_string_for(u_char* begin, u_char* end);
never@1544	269	// Returns true if this thread changed the state of the nmethod or
never@1544	270	// false if another thread performed the transition.
never@1576	271	bool make_not_entrant_or_zombie(unsigned int state);
duke@435	272	void inc_decompile_count();
duke@435	273
duke@435	274	// Used to manipulate the exception cache
duke@435	275	void add_exception_cache_entry(ExceptionCache* new_entry);
duke@435	276	ExceptionCache* exception_cache_entry_for_exception(Handle exception);
duke@435	277
duke@435	278	// Inform external interfaces that a compiled method has been unloaded
never@1999	279	void post_compiled_method_unload();
never@1999	280
never@1999	281	// Initailize fields to their default values
never@1999	282	void init_defaults();
duke@435	283
duke@435	284	public:
duke@435	285	// create nmethod with entry_bci
duke@435	286	static nmethod* new_nmethod(methodHandle method,
duke@435	287	int compile_id,
duke@435	288	int entry_bci,
duke@435	289	CodeOffsets* offsets,
duke@435	290	int orig_pc_offset,
duke@435	291	DebugInformationRecorder* recorder,
duke@435	292	Dependencies* dependencies,
duke@435	293	CodeBuffer *code_buffer,
duke@435	294	int frame_size,
duke@435	295	OopMapSet* oop_maps,
duke@435	296	ExceptionHandlerTable* handler_table,
duke@435	297	ImplicitExceptionTable* nul_chk_table,
duke@435	298	AbstractCompiler* compiler,
duke@435	299	int comp_level);
duke@435	300
duke@435	301	static nmethod* new_native_nmethod(methodHandle method,
duke@435	302	CodeBuffer *code_buffer,
duke@435	303	int vep_offset,
duke@435	304	int frame_complete,
duke@435	305	int frame_size,
duke@435	306	ByteSize receiver_sp_offset,
duke@435	307	ByteSize basic_lock_sp_offset,
duke@435	308	OopMapSet* oop_maps);
duke@435	309
kamg@551	310	#ifdef HAVE_DTRACE_H
kamg@551	311	// The method we generate for a dtrace probe has to look
kamg@551	312	// like an nmethod as far as the rest of the system is concerned
kamg@551	313	// which is somewhat unfortunate.
kamg@551	314	static nmethod* new_dtrace_nmethod(methodHandle method,
kamg@551	315	CodeBuffer *code_buffer,
kamg@551	316	int vep_offset,
kamg@551	317	int trap_offset,
kamg@551	318	int frame_complete,
kamg@551	319	int frame_size);
kamg@551	320
kamg@551	321	int trap_offset() const { return _trap_offset; }
twisti@2103	322	address trap_address() const { return insts_begin() + _trap_offset; }
kamg@551	323
kamg@551	324	#endif // def HAVE_DTRACE_H
kamg@551	325
duke@435	326	// accessors
duke@435	327	methodOop method() const { return _method; }
duke@435	328	AbstractCompiler* compiler() const { return _compiler; }
duke@435	329
duke@435	330	#ifndef PRODUCT
duke@435	331	bool has_debug_info() const { return _has_debug_info; }
duke@435	332	void set_has_debug_info(bool f) { _has_debug_info = false; }
duke@435	333	#endif // NOT PRODUCT
duke@435	334
duke@435	335	// type info
duke@435	336	bool is_nmethod() const { return true; }
duke@435	337	bool is_java_method() const { return !method()->is_native(); }
duke@435	338	bool is_native_method() const { return method()->is_native(); }
duke@435	339	bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
duke@435	340
duke@435	341	bool is_compiled_by_c1() const;
duke@435	342	bool is_compiled_by_c2() const;
twisti@2047	343	bool is_compiled_by_shark() const;
duke@435	344
duke@435	345	// boundaries for different parts
twisti@2117	346	address consts_begin () const { return header_begin() + _consts_offset ; }
twisti@2117	347	address consts_end () const { return header_begin() + code_offset() ; }
twisti@2117	348	address insts_begin () const { return header_begin() + code_offset() ; }
twisti@2103	349	address insts_end () const { return header_begin() + _stub_offset ; }
twisti@2117	350	address stub_begin () const { return header_begin() + _stub_offset ; }
twisti@2117	351	address stub_end () const { return header_begin() + _oops_offset ; }
twisti@1639	352	address exception_begin () const { return header_begin() + _exception_offset ; }
twisti@1639	353	address deopt_handler_begin () const { return header_begin() + _deoptimize_offset ; }
twisti@1639	354	address deopt_mh_handler_begin() const { return header_begin() + _deoptimize_mh_offset ; }
never@1813	355	address unwind_handler_begin () const { return _unwind_handler_offset != -1 ? (header_begin() + _unwind_handler_offset) : NULL; }
twisti@1918	356	oop* oops_begin () const { return (oop*) (header_begin() + _oops_offset) ; }
twisti@1918	357	oop* oops_end () const { return (oop*) (header_begin() + _scopes_data_offset) ; }
twisti@1918	358
twisti@1639	359	address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
twisti@1639	360	address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
twisti@1639	361	PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
twisti@1639	362	PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset) ; }
twisti@1639	363	address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
twisti@1639	364	address dependencies_end () const { return header_begin() + _handler_table_offset ; }
twisti@1639	365	address handler_table_begin () const { return header_begin() + _handler_table_offset ; }
twisti@1639	366	address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	367	address nul_chk_table_begin () const { return header_begin() + _nul_chk_table_offset ; }
twisti@1639	368	address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
duke@435	369
twisti@1918	370	// Sizes
twisti@2117	371	int consts_size () const { return consts_end () - consts_begin (); }
twisti@2103	372	int insts_size () const { return insts_end () - insts_begin (); }
twisti@1918	373	int stub_size () const { return stub_end () - stub_begin (); }
twisti@1918	374	int oops_size () const { return (address) oops_end () - (address) oops_begin (); }
twisti@1918	375	int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
twisti@1918	376	int scopes_pcs_size () const { return (intptr_t) scopes_pcs_end () - (intptr_t) scopes_pcs_begin (); }
twisti@1918	377	int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
twisti@1918	378	int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
twisti@1918	379	int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
duke@435	380
duke@435	381	int total_size () const;
duke@435	382
twisti@1918	383	// Containment
twisti@2117	384	bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
twisti@2103	385	bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
duke@435	386	bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
twisti@1918	387	bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
duke@435	388	bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
duke@435	389	bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
duke@435	390	bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
duke@435	391	bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
duke@435	392
duke@435	393	// entry points
duke@435	394	address entry_point() const { return _entry_point; } // normal entry point
duke@435	395	address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
duke@435	396
duke@435	397	// flag accessing and manipulation
never@1999	398	bool is_in_use() const { return _state == alive; }
never@1999	399	bool is_alive() const { return _state == alive || _state == not_entrant; }
never@1999	400	bool is_not_entrant() const { return _state == not_entrant; }
never@1999	401	bool is_zombie() const { return _state == zombie; }
never@1999	402	bool is_unloaded() const { return _state == unloaded; }
duke@435	403
never@1544	404	// Make the nmethod non entrant. The nmethod will continue to be
never@1544	405	// alive. It is used when an uncommon trap happens. Returns true
never@1544	406	// if this thread changed the state of the nmethod or false if
never@1544	407	// another thread performed the transition.
never@1544	408	bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
never@1544	409	bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
duke@435	410
duke@435	411	// used by jvmti to track if the unload event has been reported
duke@435	412	bool unload_reported() { return _unload_reported; }
duke@435	413	void set_unload_reported() { _unload_reported = true; }
duke@435	414
never@1999	415	bool is_marked_for_deoptimization() const { return _marked_for_deoptimization; }
never@1999	416	void mark_for_deoptimization() { _marked_for_deoptimization = true; }
duke@435	417
duke@435	418	void make_unloaded(BoolObjectClosure* is_alive, oop cause);
duke@435	419
duke@435	420	bool has_dependencies() { return dependencies_size() != 0; }
duke@435	421	void flush_dependencies(BoolObjectClosure* is_alive);
never@1999	422	bool has_flushed_dependencies() { return _has_flushed_dependencies; }
never@1999	423	void set_has_flushed_dependencies() {
duke@435	424	assert(!has_flushed_dependencies(), "should only happen once");
never@1999	425	_has_flushed_dependencies = 1;
duke@435	426	}
duke@435	427
never@1999	428	bool is_marked_for_reclamation() const { return _marked_for_reclamation; }
never@1999	429	void mark_for_reclamation() { _marked_for_reclamation = 1; }
duke@435	430
never@1999	431	bool has_unsafe_access() const { return _has_unsafe_access; }
never@1999	432	void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
duke@435	433
never@1999	434	bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
never@1999	435	void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
twisti@1570	436
never@1999	437	bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
never@1999	438	void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
kvn@1637	439
duke@435	440	int comp_level() const { return _comp_level; }
duke@435	441
twisti@1918	442	// Support for oops in scopes and relocs:
twisti@1918	443	// Note: index 0 is reserved for null.
twisti@1918	444	oop oop_at(int index) const { return index == 0 ? (oop) NULL: *oop_addr_at(index); }
twisti@1918	445	oop* oop_addr_at(int index) const { // for GC
twisti@1918	446	// relocation indexes are biased by 1 (because 0 is reserved)
twisti@1918	447	assert(index > 0 && index <= oops_size(), "must be a valid non-zero index");
never@2081	448	assert(!_oops_are_stale, "oops are stale");
twisti@1918	449	return &oops_begin()[index - 1];
twisti@1918	450	}
twisti@1918	451
twisti@1918	452	void copy_oops(GrowableArray<jobject>* oops);
twisti@1918	453
twisti@1918	454	// Relocation support
twisti@1918	455	private:
twisti@1918	456	void fix_oop_relocations(address begin, address end, bool initialize_immediates);
twisti@1918	457	inline void initialize_immediate_oop(oop* dest, jobject handle);
twisti@1918	458
twisti@1918	459	public:
twisti@1918	460	void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); }
twisti@1918	461	void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); }
twisti@1918	462
twisti@1918	463	bool is_at_poll_return(address pc);
twisti@1918	464	bool is_at_poll_or_poll_return(address pc);
twisti@1918	465
jrose@1424	466	// Non-perm oop support
jrose@1424	467	bool on_scavenge_root_list() const { return (_scavenge_root_state & 1) != 0; }
jrose@1424	468	protected:
jrose@1424	469	enum { npl_on_list = 0x01, npl_marked = 0x10 };
jrose@1424	470	void set_on_scavenge_root_list() { _scavenge_root_state = npl_on_list; }
jrose@1424	471	void clear_on_scavenge_root_list() { _scavenge_root_state = 0; }
jrose@1424	472	// assertion-checking and pruning logic uses the bits of _scavenge_root_state
jrose@1424	473	#ifndef PRODUCT
jrose@1424	474	void set_scavenge_root_marked() { _scavenge_root_state |= npl_marked; }
jrose@1424	475	void clear_scavenge_root_marked() { _scavenge_root_state &= ~npl_marked; }
jrose@1424	476	bool scavenge_root_not_marked() { return (_scavenge_root_state &~ npl_on_list) == 0; }
jrose@1424	477	// N.B. there is no positive marked query, and we only use the not_marked query for asserts.
jrose@1424	478	#endif //PRODUCT
jrose@1424	479	nmethod* scavenge_root_link() const { return _scavenge_root_link; }
jrose@1424	480	void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
jrose@1424	481
kvn@1637	482	nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
kvn@1637	483	void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
kvn@1637	484
jrose@1424	485	public:
jrose@1424	486
duke@435	487	// Sweeper support
duke@435	488	long stack_traversal_mark() { return _stack_traversal_mark; }
duke@435	489	void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
duke@435	490
duke@435	491	// Exception cache support
duke@435	492	ExceptionCache* exception_cache() const { return _exception_cache; }
duke@435	493	void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
duke@435	494	address handler_for_exception_and_pc(Handle exception, address pc);
duke@435	495	void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
duke@435	496	void remove_from_exception_cache(ExceptionCache* ec);
duke@435	497
duke@435	498	// implicit exceptions support
duke@435	499	address continuation_for_implicit_exception(address pc);
duke@435	500
duke@435	501	// On-stack replacement support
duke@435	502	int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
duke@435	503	address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
duke@435	504	void invalidate_osr_method();
jrose@1424	505	nmethod* osr_link() const { return _osr_link; }
jrose@1424	506	void set_osr_link(nmethod *n) { _osr_link = n; }
duke@435	507
duke@435	508	// tells whether frames described by this nmethod can be deoptimized
duke@435	509	// note: native wrappers cannot be deoptimized.
duke@435	510	bool can_be_deoptimized() const { return is_java_method(); }
duke@435	511
duke@435	512	// Inline cache support
duke@435	513	void clear_inline_caches();
duke@435	514	void cleanup_inline_caches();
duke@435	515	bool inlinecache_check_contains(address addr) const {
twisti@2103	516	return (addr >= code_begin() && addr < verified_entry_point());
duke@435	517	}
duke@435	518
duke@435	519	// unlink and deallocate this nmethod
duke@435	520	// Only NMethodSweeper class is expected to use this. NMethodSweeper is not
duke@435	521	// expected to use any other private methods/data in this class.
duke@435	522
duke@435	523	protected:
duke@435	524	void flush();
duke@435	525
duke@435	526	public:
dcubed@2624	527	// When true is returned, it is unsafe to remove this nmethod even if
dcubed@2624	528	// it is a zombie, since the VM or the ServiceThread might still be
dcubed@2624	529	// using it.
duke@435	530	bool is_locked_by_vm() const { return _lock_count >0; }
duke@435	531
duke@435	532	// See comment at definition of _last_seen_on_stack
duke@435	533	void mark_as_seen_on_stack();
duke@435	534	bool can_not_entrant_be_converted();
duke@435	535
duke@435	536	// Evolution support. We make old (discarded) compiled methods point to new methodOops.
duke@435	537	void set_method(methodOop method) { _method = method; }
duke@435	538
duke@435	539	// GC support
duke@435	540	void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	541	bool unloading_occurred);
duke@435	542	bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
duke@435	543	oop* root, bool unloading_occurred);
duke@435	544
duke@435	545	void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
duke@435	546	OopClosure* f);
twisti@1918	547	void oops_do(OopClosure* f) { oops_do(f, false); }
twisti@1918	548	void oops_do(OopClosure* f, bool do_strong_roots_only);
jrose@1424	549	bool detect_scavenge_root_oops();
jrose@1424	550	void verify_scavenge_root_oops() PRODUCT_RETURN;
jrose@1424	551
jrose@1424	552	bool test_set_oops_do_mark();
jrose@1424	553	static void oops_do_marking_prologue();
jrose@1424	554	static void oops_do_marking_epilogue();
jrose@1424	555	static bool oops_do_marking_is_active() { return _oops_do_mark_nmethods != NULL; }
jrose@1424	556	DEBUG_ONLY(bool test_oops_do_mark() { return _oops_do_mark_link != NULL; })
duke@435	557
duke@435	558	// ScopeDesc for an instruction
duke@435	559	ScopeDesc* scope_desc_at(address pc);
duke@435	560
duke@435	561	private:
duke@435	562	ScopeDesc* scope_desc_in(address begin, address end);
duke@435	563
twisti@1639	564	address* orig_pc_addr(const frame* fr) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
duke@435	565
duke@435	566	PcDesc* find_pc_desc_internal(address pc, bool approximate);
duke@435	567
duke@435	568	PcDesc* find_pc_desc(address pc, bool approximate) {
duke@435	569	PcDesc* desc = _pc_desc_cache.last_pc_desc();
twisti@2103	570	if (desc != NULL && desc->pc_offset() == pc - code_begin()) {
duke@435	571	return desc;
duke@435	572	}
duke@435	573	return find_pc_desc_internal(pc, approximate);
duke@435	574	}
duke@435	575
duke@435	576	public:
duke@435	577	// ScopeDesc retrieval operation
duke@435	578	PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
duke@435	579	// pc_desc_near returns the first PcDesc at or after the givne pc.
duke@435	580	PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
duke@435	581
duke@435	582	public:
duke@435	583	// copying of debugging information
duke@435	584	void copy_scopes_pcs(PcDesc* pcs, int count);
duke@435	585	void copy_scopes_data(address buffer, int size);
duke@435	586
twisti@1639	587	// Deopt
twisti@1639	588	// Return true is the PC is one would expect if the frame is being deopted.
twisti@1639	589	bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
twisti@1639	590	bool is_deopt_entry (address pc) { return pc == deopt_handler_begin(); }
twisti@1639	591	bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
duke@435	592	// Accessor/mutator for the original pc of a frame before a frame was deopted.
duke@435	593	address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
duke@435	594	void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
duke@435	595
twisti@1639	596	static address get_deopt_original_pc(const frame* fr);
twisti@1639	597
twisti@1570	598	// MethodHandle
twisti@1570	599	bool is_method_handle_return(address return_pc);
twisti@1570	600
duke@435	601	// jvmti support:
duke@435	602	void post_compiled_method_load_event();
never@1971	603	jmethodID get_and_cache_jmethod_id();
duke@435	604
duke@435	605	// verify operations
duke@435	606	void verify();
duke@435	607	void verify_scopes();
duke@435	608	void verify_interrupt_point(address interrupt_point);
duke@435	609
iveresov@2138	610	// print compilation helper
iveresov@2138	611	static void print_compilation(outputStream *st, const char *method_name, const char *title,
iveresov@2138	612	methodOop method, bool is_blocking, int compile_id, int bci, int comp_level);
iveresov@2138	613
duke@435	614	// printing support
jrose@535	615	void print() const;
jrose@535	616	void print_code();
duke@435	617	void print_relocations() PRODUCT_RETURN;
duke@435	618	void print_pcs() PRODUCT_RETURN;
duke@435	619	void print_scopes() PRODUCT_RETURN;
duke@435	620	void print_dependencies() PRODUCT_RETURN;
duke@435	621	void print_value_on(outputStream* st) const PRODUCT_RETURN;
duke@435	622	void print_calls(outputStream* st) PRODUCT_RETURN;
duke@435	623	void print_handler_table() PRODUCT_RETURN;
duke@435	624	void print_nul_chk_table() PRODUCT_RETURN;
jrose@535	625	void print_nmethod(bool print_code);
duke@435	626
bobv@2036	627	// need to re-define this from CodeBlob else the overload hides it
bobv@2036	628	virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
duke@435	629	void print_on(outputStream* st, const char* title) const;
duke@435	630
duke@435	631	// Logging
duke@435	632	void log_identity(xmlStream* log) const;
duke@435	633	void log_new_nmethod() const;
never@1544	634	void log_state_change() const;
duke@435	635
jrose@1590	636	// Prints block-level comments, including nmethod specific block labels:
jrose@1590	637	virtual void print_block_comment(outputStream* stream, address block_begin) {
jrose@1590	638	print_nmethod_labels(stream, block_begin);
jrose@1590	639	CodeBlob::print_block_comment(stream, block_begin);
jrose@1590	640	}
jrose@1590	641	void print_nmethod_labels(outputStream* stream, address block_begin);
jrose@1590	642
duke@435	643	// Prints a comment for one native instruction (reloc info, pc desc)
jrose@535	644	void print_code_comment_on(outputStream* st, int column, address begin, address end);
duke@435	645	static void print_statistics() PRODUCT_RETURN;
duke@435	646
duke@435	647	// Compiler task identification. Note that all OSR methods
duke@435	648	// are numbered in an independent sequence if CICountOSR is true,
duke@435	649	// and native method wrappers are also numbered independently if
duke@435	650	// CICountNative is true.
duke@435	651	int compile_id() const { return _compile_id; }
duke@435	652	const char* compile_kind() const;
duke@435	653
duke@435	654	// For debugging
duke@435	655	// CompiledIC* IC_at(char* p) const;
duke@435	656	// PrimitiveIC* primitiveIC_at(char* p) const;
duke@435	657	oop embeddedOop_at(address p);
duke@435	658
duke@435	659	// tells if any of this method's dependencies have been invalidated
duke@435	660	// (this is expensive!)
duke@435	661	bool check_all_dependencies();
duke@435	662
duke@435	663	// tells if this compiled method is dependent on the given changes,
duke@435	664	// and the changes have invalidated it
duke@435	665	bool check_dependency_on(DepChange& changes);
duke@435	666
duke@435	667	// Evolution support. Tells if this compiled method is dependent on any of
duke@435	668	// methods m() of class dependee, such that if m() in dependee is replaced,
duke@435	669	// this compiled method will have to be deoptimized.
duke@435	670	bool is_evol_dependent_on(klassOop dependee);
duke@435	671
duke@435	672	// Fast breakpoint support. Tells if this compiled method is
duke@435	673	// dependent on the given method. Returns true if this nmethod
duke@435	674	// corresponds to the given method as well.
duke@435	675	bool is_dependent_on_method(methodOop dependee);
duke@435	676
duke@435	677	// is it ok to patch at address?
duke@435	678	bool is_patchable_at(address instr_address);
duke@435	679
duke@435	680	// UseBiasedLocking support
kamg@2361	681	ByteSize native_receiver_sp_offset() {
kamg@2361	682	return _native_receiver_sp_offset;
duke@435	683	}
kamg@2361	684	ByteSize native_basic_lock_sp_offset() {
kamg@2361	685	return _native_basic_lock_sp_offset;
duke@435	686	}
duke@435	687
duke@435	688	// support for code generation
duke@435	689	static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
duke@435	690	static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
duke@435	691	static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
duke@435	692
duke@435	693	};
duke@435	694
dcubed@2624	695	// Locks an nmethod so its code will not get removed and it will not
dcubed@2624	696	// be made into a zombie, even if it is a not_entrant method. After the
dcubed@2624	697	// nmethod becomes a zombie, if CompiledMethodUnload event processing
dcubed@2624	698	// needs to be done, then lock_nmethod() is used directly to keep the
dcubed@2624	699	// generated code from being reused too early.
duke@435	700	class nmethodLocker : public StackObj {
duke@435	701	nmethod* _nm;
duke@435	702
kamg@2511	703	public:
kamg@2511	704
dcubed@2624	705	// note: nm can be NULL
dcubed@2624	706	// Only JvmtiDeferredEvent::compiled_method_unload_event()
dcubed@2624	707	// should pass zombie_ok == true.
dcubed@2624	708	static void lock_nmethod(nmethod* nm, bool zombie_ok = false);
duke@435	709	static void unlock_nmethod(nmethod* nm); // (ditto)
duke@435	710
duke@435	711	nmethodLocker(address pc); // derive nm from pc
duke@435	712	nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
duke@435	713	nmethodLocker() { _nm = NULL; }
duke@435	714	~nmethodLocker() { unlock_nmethod(_nm); }
duke@435	715
duke@435	716	nmethod* code() { return _nm; }
duke@435	717	void set_code(nmethod* new_nm) {
duke@435	718	unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
duke@435	719	_nm = new_nm;
duke@435	720	lock_nmethod(_nm);
duke@435	721	}
duke@435	722	};
stefank@2314	723
stefank@2314	724	#endif // SHARE_VM_CODE_NMETHOD_HPP