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src/share/vm/runtime/deoptimization.hpp@b2b6a9bf6238 (annotated)

src/share/vm/runtime/deoptimization.hpp

Tue, 12 Jan 2010 14:37:35 -0800

author

cfang

date

Tue, 12 Jan 2010 14:37:35 -0800

changeset 1607

b2b6a9bf6238

parent 631

d1605aabd0a1

child 1641

87684f1a88b5

permissions

-rw-r--r--

6894779: Loop Predication for Loop Optimizer in C2
Summary: Loop predication implementation
Reviewed-by: never, kvn

duke@435	1	/*
xdono@631	2	* Copyright 1997-2008 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class ProfileData;
duke@435	26	class vframeArray;
duke@435	27	class MonitorValue;
duke@435	28	class ObjectValue;
duke@435	29
duke@435	30	class Deoptimization : AllStatic {
duke@435	31	public:
duke@435	32	// What condition caused the deoptimization?
duke@435	33	enum DeoptReason {
duke@435	34	Reason_many = -1, // indicates presence of several reasons
duke@435	35	Reason_none = 0, // indicates absence of a relevant deopt.
duke@435	36	Reason_null_check, // saw unexpected null or zero divisor (@bci)
duke@435	37	Reason_null_assert, // saw unexpected non-null or non-zero (@bci)
duke@435	38	Reason_range_check, // saw unexpected array index (@bci)
duke@435	39	Reason_class_check, // saw unexpected object class (@bci)
duke@435	40	Reason_array_check, // saw unexpected array class (aastore @bci)
duke@435	41	Reason_intrinsic, // saw unexpected operand to intrinsic (@bci)
duke@435	42	Reason_unloaded, // unloaded class or constant pool entry
duke@435	43	Reason_uninitialized, // bad class state (uninitialized)
duke@435	44	Reason_unreached, // code is not reached, compiler
duke@435	45	Reason_unhandled, // arbitrary compiler limitation
duke@435	46	Reason_constraint, // arbitrary runtime constraint violated
duke@435	47	Reason_div0_check, // a null_check due to division by zero
duke@435	48	Reason_age, // nmethod too old; tier threshold reached
cfang@1607	49	Reason_predicate, // compiler generated predicate failed
duke@435	50	Reason_LIMIT,
duke@435	51	// Note: Keep this enum in sync. with _trap_reason_name.
duke@435	52	Reason_RECORDED_LIMIT = Reason_unloaded // some are not recorded per bc
duke@435	53	// Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of
duke@435	54	// DataLayout::trap_bits. This dependency is enforced indirectly
duke@435	55	// via asserts, to avoid excessive direct header-to-header dependencies.
duke@435	56	// See Deoptimization::trap_state_reason and class DataLayout.
duke@435	57	};
duke@435	58
duke@435	59	// What action must be taken by the runtime?
duke@435	60	enum DeoptAction {
duke@435	61	Action_none, // just interpret, do not invalidate nmethod
duke@435	62	Action_maybe_recompile, // recompile the nmethod; need not invalidate
duke@435	63	Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile
duke@435	64	Action_make_not_entrant, // invalidate the nmethod, recompile (probably)
duke@435	65	Action_make_not_compilable, // invalidate the nmethod and do not compile
duke@435	66	Action_LIMIT
duke@435	67	// Note: Keep this enum in sync. with _trap_action_name.
duke@435	68	};
duke@435	69
duke@435	70	enum {
duke@435	71	_action_bits = 3,
duke@435	72	_reason_bits = 4,
duke@435	73	_action_shift = 0,
duke@435	74	_reason_shift = _action_shift+_action_bits,
duke@435	75	BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist
duke@435	76	};
duke@435	77
duke@435	78	enum UnpackType {
duke@435	79	Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack
duke@435	80	Unpack_exception = 1, // exception is pending
duke@435	81	Unpack_uncommon_trap = 2, // redo last byte code (C2 only)
duke@435	82	Unpack_reexecute = 3 // reexecute bytecode (C1 only)
duke@435	83	};
duke@435	84
duke@435	85	// Checks all compiled methods. Invalid methods are deleted and
duke@435	86	// corresponding activations are deoptimized.
duke@435	87	static int deoptimize_dependents();
duke@435	88
duke@435	89	// Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame
duke@435	90	static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map);
duke@435	91
duke@435	92	private:
duke@435	93	// Does the actual work for deoptimizing a single frame
duke@435	94	static void deoptimize_single_frame(JavaThread* thread, frame fr);
duke@435	95
duke@435	96	// Helper function to revoke biases of all monitors in frame if UseBiasedLocking
duke@435	97	// is enabled
duke@435	98	static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map);
duke@435	99	// Helper function to revoke biases of all monitors in frames
duke@435	100	// executing in a particular CodeBlob if UseBiasedLocking is enabled
duke@435	101	static void revoke_biases_of_monitors(CodeBlob* cb);
duke@435	102
duke@435	103	#ifdef COMPILER2
duke@435	104	// Support for restoring non-escaping objects
duke@435	105	static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS);
duke@435	106	static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type);
duke@435	107	static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj);
duke@435	108	static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects);
kvn@518	109	static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread);
duke@435	110	NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);)
duke@435	111	#endif // COMPILER2
duke@435	112
duke@435	113	public:
duke@435	114	static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk);
duke@435	115
duke@435	116	// Interface used for unpacking deoptimized frames
duke@435	117
duke@435	118	// UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob).
duke@435	119	// This is only a CheapObj to ease debugging after a deopt failure
duke@435	120	class UnrollBlock : public CHeapObj {
duke@435	121	private:
duke@435	122	int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame
duke@435	123	int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame
duke@435	124	int _number_of_frames; // Number frames to unroll
duke@435	125	int _total_frame_sizes; // Total of number*sizes frames
duke@435	126	intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack
duke@435	127	address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack
duke@435	128	intptr_t* _register_block; // Block for storing callee-saved registers.
duke@435	129	BasicType _return_type; // Tells if we have to restore double or long return value
duke@435	130	// The following fields are used as temps during the unpacking phase
duke@435	131	// (which is tight on registers, especially on x86). They really ought
duke@435	132	// to be PD variables but that involves moving this class into its own
duke@435	133	// file to use the pd include mechanism. Maybe in a later cleanup ...
duke@435	134	intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp)
duke@435	135	intptr_t _initial_fp; // SHOULD BE PD VARIABLE (x86/c2 initial ebp)
duke@435	136	intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind)
duke@435	137	intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp)
duke@435	138	public:
duke@435	139	// Constructor
duke@435	140	UnrollBlock(int size_of_deoptimized_frame,
duke@435	141	int caller_adjustment,
duke@435	142	int number_of_frames,
duke@435	143	intptr_t* frame_sizes,
duke@435	144	address* frames_pcs,
duke@435	145	BasicType return_type);
duke@435	146	~UnrollBlock();
duke@435	147
duke@435	148	// Returns where a register is located.
duke@435	149	intptr_t* value_addr_at(int register_number) const;
duke@435	150
duke@435	151	// Accessors
duke@435	152	intptr_t* frame_sizes() const { return _frame_sizes; }
duke@435	153	int number_of_frames() const { return _number_of_frames; }
duke@435	154	address* frame_pcs() const { return _frame_pcs ; }
duke@435	155
duke@435	156	// Returns the total size of frames
duke@435	157	int size_of_frames() const;
duke@435	158
duke@435	159	// Accessors used by the code generator for the unpack stub.
duke@435	160	static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); }
duke@435	161	static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); }
duke@435	162	static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); }
duke@435	163	static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); }
duke@435	164	static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); }
duke@435	165	static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); }
duke@435	166	static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); }
duke@435	167	static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); }
duke@435	168	static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); }
duke@435	169	static int initial_fp_offset_in_bytes() { return offset_of(UnrollBlock, _initial_fp); }
duke@435	170	static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); }
duke@435	171	static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); }
duke@435	172
duke@435	173	BasicType return_type() const { return _return_type; }
duke@435	174	void print();
duke@435	175	};
duke@435	176
duke@435	177	//** Returns an UnrollBlock continuing information
duke@435	178	// how to make room for the resulting interpreter frames.
duke@435	179	// Called by assembly stub after execution has returned to
duke@435	180	// deoptimized frame.
duke@435	181	// @argument thread. Thread where stub_frame resides.
duke@435	182	// @see OptoRuntime::deoptimization_fetch_unroll_info_C
duke@435	183	static UnrollBlock* fetch_unroll_info(JavaThread* thread);
duke@435	184
duke@435	185	//** Unpacks vframeArray onto execution stack
duke@435	186	// Called by assembly stub after execution has returned to
duke@435	187	// deoptimized frame and after the stack unrolling.
duke@435	188	// @argument thread. Thread where stub_frame resides.
duke@435	189	// @argument exec_mode. Determines how execution should be continuted in top frame.
duke@435	190	// 0 means continue after current byte code
duke@435	191	// 1 means exception has happened, handle exception
duke@435	192	// 2 means reexecute current bytecode (for uncommon traps).
duke@435	193	// @see OptoRuntime::deoptimization_unpack_frames_C
duke@435	194	// Return BasicType of call return type, if any
duke@435	195	static BasicType unpack_frames(JavaThread* thread, int exec_mode);
duke@435	196
duke@435	197	// Cleans up deoptimization bits on thread after unpacking or in the
duke@435	198	// case of an exception.
duke@435	199	static void cleanup_deopt_info(JavaThread *thread,
duke@435	200	vframeArray * array);
duke@435	201
duke@435	202	// Restores callee saved values from deoptimized frame into oldest interpreter frame
duke@435	203	// so caller of the deoptimized frame will get back the values it expects.
duke@435	204	static void unwind_callee_save_values(frame* f, vframeArray* vframe_array);
duke@435	205
duke@435	206	//** Performs an uncommon trap for compiled code.
duke@435	207	// The top most compiler frame is converted into interpreter frames
duke@435	208	static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index);
duke@435	209	// Helper routine that enters the VM and may block
duke@435	210	static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index);
duke@435	211
duke@435	212	//** Deoptimizes the frame identified by id.
duke@435	213	// Only called from VMDeoptimizeFrame
duke@435	214	// @argument thread. Thread where stub_frame resides.
duke@435	215	// @argument id. id of frame that should be deoptimized.
duke@435	216	static void deoptimize_frame(JavaThread* thread, intptr_t* id);
duke@435	217
duke@435	218	// Statistics
duke@435	219	static void gather_statistics(DeoptReason reason, DeoptAction action,
duke@435	220	Bytecodes::Code bc = Bytecodes::_illegal);
duke@435	221	static void print_statistics();
duke@435	222
duke@435	223	// How much room to adjust the last frame's SP by, to make space for
duke@435	224	// the callee's interpreter frame (which expects locals to be next to
duke@435	225	// incoming arguments)
duke@435	226	static int last_frame_adjust(int callee_parameters, int callee_locals);
duke@435	227
duke@435	228	// trap_request codes
duke@435	229	static DeoptReason trap_request_reason(int trap_request) {
duke@435	230	if (trap_request < 0)
duke@435	231	return (DeoptReason)
duke@435	232	((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits));
duke@435	233	else
duke@435	234	// standard reason for unloaded CP entry
duke@435	235	return Reason_unloaded;
duke@435	236	}
duke@435	237	static DeoptAction trap_request_action(int trap_request) {
duke@435	238	if (trap_request < 0)
duke@435	239	return (DeoptAction)
duke@435	240	((~(trap_request) >> _action_shift) & right_n_bits(_action_bits));
duke@435	241	else
duke@435	242	// standard action for unloaded CP entry
duke@435	243	return _unloaded_action;
duke@435	244	}
duke@435	245	static int trap_request_index(int trap_request) {
duke@435	246	if (trap_request < 0)
duke@435	247	return -1;
duke@435	248	else
duke@435	249	return trap_request;
duke@435	250	}
duke@435	251	static int make_trap_request(DeoptReason reason, DeoptAction action,
duke@435	252	int index = -1) {
duke@435	253	assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits");
duke@435	254	assert((1 << _action_bits) >= Action_LIMIT, "enough bits");
duke@435	255	int trap_request;
duke@435	256	if (index != -1)
duke@435	257	trap_request = index;
duke@435	258	else
duke@435	259	trap_request = (~(((reason) << _reason_shift)
duke@435	260	+ ((action) << _action_shift)));
duke@435	261	assert(reason == trap_request_reason(trap_request), "valid reason");
duke@435	262	assert(action == trap_request_action(trap_request), "valid action");
duke@435	263	assert(index == trap_request_index(trap_request), "valid index");
duke@435	264	return trap_request;
duke@435	265	}
duke@435	266
duke@435	267	// The trap_state stored in a MDO is decoded here.
duke@435	268	// It records two items of information.
duke@435	269	// reason: If a deoptimization happened here, what its reason was,
duke@435	270	// or if there were multiple deopts with differing reasons.
duke@435	271	// recompiled: If a deoptimization here triggered a recompilation.
duke@435	272	// Note that not all reasons are recorded per-bci.
duke@435	273	static DeoptReason trap_state_reason(int trap_state);
duke@435	274	static int trap_state_has_reason(int trap_state, int reason);
duke@435	275	static int trap_state_add_reason(int trap_state, int reason);
duke@435	276	static bool trap_state_is_recompiled(int trap_state);
duke@435	277	static int trap_state_set_recompiled(int trap_state, bool z);
duke@435	278	static const char* format_trap_state(char* buf, size_t buflen,
duke@435	279	int trap_state);
duke@435	280
duke@435	281	static bool reason_is_recorded_per_bytecode(DeoptReason reason) {
duke@435	282	return reason > Reason_none && reason < Reason_RECORDED_LIMIT;
duke@435	283	}
duke@435	284
duke@435	285	static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) {
duke@435	286	if (reason_is_recorded_per_bytecode(reason))
duke@435	287	return reason;
duke@435	288	else if (reason == Reason_div0_check) // null check due to divide-by-zero?
duke@435	289	return Reason_null_check; // recorded per BCI as a null check
duke@435	290	else
duke@435	291	return Reason_none;
duke@435	292	}
duke@435	293
duke@435	294	static const char* trap_reason_name(int reason);
duke@435	295	static const char* trap_action_name(int action);
duke@435	296	// Format like reason='foo' action='bar' index='123'.
duke@435	297	// This is suitable both for XML and for tty output.
duke@435	298	static const char* format_trap_request(char* buf, size_t buflen,
duke@435	299	int trap_request);
duke@435	300
duke@435	301	static jint total_deoptimization_count();
duke@435	302	static jint deoptimization_count(DeoptReason reason);
duke@435	303
duke@435	304	// JVMTI PopFrame support
duke@435	305
duke@435	306	// Preserves incoming arguments to the popped frame when it is
duke@435	307	// returning to a deoptimized caller
duke@435	308	static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address);
duke@435	309
duke@435	310	private:
duke@435	311	enum {
duke@435	312	_no_count = -1
duke@435	313	};
duke@435	314
duke@435	315	static void reset_invocation_counter(ScopeDesc* trap_scope, jint count = _no_count);
duke@435	316
duke@435	317	static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing);
duke@435	318	// Update the mdo's count and per-BCI reason bits, returning previous state:
duke@435	319	static ProfileData* query_update_method_data(methodDataHandle trap_mdo,
duke@435	320	int trap_bci,
duke@435	321	DeoptReason reason,
duke@435	322	//outputs:
duke@435	323	uint& ret_this_trap_count,
duke@435	324	bool& ret_maybe_prior_trap,
duke@435	325	bool& ret_maybe_prior_recompile);
duke@435	326	// class loading support for uncommon trap
duke@435	327	static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS);
duke@435	328	static void load_class_by_index(constantPoolHandle constant_pool, int index);
duke@435	329
duke@435	330	static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread);
duke@435	331
duke@435	332	static DeoptAction _unloaded_action; // == Action_reinterpret;
duke@435	333	static const char* _trap_reason_name[Reason_LIMIT];
duke@435	334	static const char* _trap_action_name[Action_LIMIT];
duke@435	335
duke@435	336	static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT];
duke@435	337	// Note: Histogram array size is 1-2 Kb.
duke@435	338
duke@435	339	public:
duke@435	340	static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason);
duke@435	341	};
duke@435	342
duke@435	343	class DeoptimizationMarker : StackObj { // for profiling
duke@435	344	static bool _is_active;
duke@435	345	public:
duke@435	346	DeoptimizationMarker() { _is_active = true; }
duke@435	347	~DeoptimizationMarker() { _is_active = false; }
duke@435	348	static bool is_active() { return _is_active; }
duke@435	349	};