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src/share/vm/code/debugInfoRec.hpp@e9ff18c4ace7 (annotated)

src/share/vm/code/debugInfoRec.hpp

Wed, 02 Jun 2010 22:45:42 -0700

author

jrose

date

Wed, 02 Jun 2010 22:45:42 -0700

changeset 1934

e9ff18c4ace7

parent 1907

c18cbe5936b8

child 2314

f95d63e2154a

permissions

-rw-r--r--

Merge

duke@435	1	/*
trims@1907	2	* Copyright (c) 1998, 2009, 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
duke@435	25	//** The DebugInformationRecorder collects debugging information
duke@435	26	// for a compiled method.
duke@435	27	// Debugging information is used for:
duke@435	28	// - garbage collecting compiled frames
duke@435	29	// - stack tracing across compiled frames
duke@435	30	// - deoptimizating compiled frames
duke@435	31	//
duke@435	32	// The implementation requires the compiler to use the recorder
duke@435	33	// in the following order:
duke@435	34	// 1) Describe debug information for safepoints at increasing addresses.
duke@435	35	// a) Add safepoint entry (use add_safepoint or add_non_safepoint)
duke@435	36	// b) Describe scopes for that safepoint
duke@435	37	// - create locals if needed (use create_scope_values)
duke@435	38	// - create expressions if needed (use create_scope_values)
duke@435	39	// - create monitor stack if needed (use create_monitor_values)
duke@435	40	// - describe scope (use describe_scope)
duke@435	41	// "repeat last four steps for all scopes"
duke@435	42	// "outer most scope first and inner most scope last"
duke@435	43	// NB: nodes from create_scope_values and create_locations
duke@435	44	// can be reused for simple sharing.
duke@435	45	// - mark the end of the scopes (end_safepoint or end_non_safepoint)
duke@435	46	// 2) Use oop_size, data_size, pcs_size to create the nmethod and
duke@435	47	// finally migrate the debugging information into the nmethod
duke@435	48	// by calling copy_to.
duke@435	49
duke@435	50	class DebugToken; // Opaque datatype for stored:
duke@435	51	// - GrowableArray<ScopeValue*>
duke@435	52	// - GrowableArray<MonitorValue*>
duke@435	53
duke@435	54	// Alias for InvocationEntryBci.
duke@435	55	// Both constants are used for a pseudo-BCI which refers
duke@435	56	// to the state just _before_ a method is entered.
duke@435	57	// SynchronizationEntryBCI is used where the emphasis
duke@435	58	// is on the implicit monitorenter of a synchronized method.
duke@435	59	const int SynchronizationEntryBCI = InvocationEntryBci;
duke@435	60
duke@435	61	class DIR_Chunk; // private class, a nugget of collected information
duke@435	62
duke@435	63	class DebugInformationRecorder: public ResourceObj {
duke@435	64	public:
duke@435	65	// constructor
duke@435	66	DebugInformationRecorder(OopRecorder* oop_recorder);
duke@435	67
duke@435	68	// adds an oopmap at a specific offset
duke@435	69	void add_oopmap(int pc_offset, OopMap* map);
duke@435	70
duke@435	71	// adds a jvm mapping at pc-offset, for a safepoint only
duke@435	72	void add_safepoint(int pc_offset, OopMap* map);
duke@435	73
duke@435	74	// adds a jvm mapping at pc-offset, for a non-safepoint (profile point)
duke@435	75	void add_non_safepoint(int pc_offset);
duke@435	76
duke@435	77	// Describes debugging information for a scope at the given pc_offset.
duke@435	78	// Calls must be in non-decreasing order of pc_offset.
duke@435	79	// If there are several calls at a single pc_offset,
duke@435	80	// then they occur in the same order as they were performed by the JVM,
duke@435	81	// with the most recent (innermost) call being described last.
duke@435	82	// For a safepoint, the pc_offset must have been mentioned
duke@435	83	// previously by add_safepoint.
duke@435	84	// Otherwise, the pc_offset must have been mentioned previously
duke@435	85	// by add_non_safepoint, and the locals, expressions, and monitors
duke@435	86	// must all be null.
duke@435	87	void describe_scope(int pc_offset,
duke@435	88	ciMethod* method,
duke@435	89	int bci,
cfang@1335	90	bool reexecute,
twisti@1570	91	bool is_method_handle_invoke = false,
kvn@1688	92	bool return_oop = false,
duke@435	93	DebugToken* locals = NULL,
duke@435	94	DebugToken* expressions = NULL,
duke@435	95	DebugToken* monitors = NULL);
duke@435	96
duke@435	97
duke@435	98	void dump_object_pool(GrowableArray<ScopeValue*>* objects);
duke@435	99
duke@435	100	// This call must follow every add_safepoint,
duke@435	101	// after any intervening describe_scope calls.
duke@435	102	void end_safepoint(int pc_offset) { end_scopes(pc_offset, true); }
duke@435	103	void end_non_safepoint(int pc_offset) { end_scopes(pc_offset, false); }
duke@435	104
duke@435	105	// helper fuctions for describe_scope to enable sharing
duke@435	106	DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values);
duke@435	107	DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors);
duke@435	108
duke@435	109	// returns the size of the generated scopeDescs.
duke@435	110	int data_size();
duke@435	111	int pcs_size();
duke@435	112	int oop_size() { return oop_recorder()->oop_size(); }
duke@435	113
duke@435	114	// copy the generated debugging information to nmethod
duke@435	115	void copy_to(nmethod* nm);
duke@435	116
duke@435	117	// verifies the debug information
duke@435	118	void verify(const nmethod* code);
duke@435	119
duke@435	120	static void print_statistics() PRODUCT_RETURN;
duke@435	121
duke@435	122	// Method for setting oopmaps to temporarily preserve old handling of oopmaps
duke@435	123	OopMapSet *_oopmaps;
duke@435	124	void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; }
duke@435	125
duke@435	126	OopRecorder* oop_recorder() { return _oop_recorder; }
duke@435	127
duke@435	128	int last_pc_offset() { return last_pc()->pc_offset(); }
duke@435	129
duke@435	130	bool recording_non_safepoints() { return _recording_non_safepoints; }
duke@435	131
duke@435	132	private:
duke@435	133	friend class ScopeDesc;
duke@435	134	friend class vframeStreamCommon;
duke@435	135	friend class DIR_Chunk;
duke@435	136
duke@435	137	// True if we are recording non-safepoint scopes.
duke@435	138	// This flag is set if DebugNonSafepoints is true, or if
duke@435	139	// JVMTI post_compiled_method_load events are enabled.
duke@435	140	const bool _recording_non_safepoints;
duke@435	141
duke@435	142	DebugInfoWriteStream* _stream;
duke@435	143
duke@435	144	DebugInfoWriteStream* stream() const { return _stream; }
duke@435	145
duke@435	146	OopRecorder* _oop_recorder;
duke@435	147
duke@435	148	// Scopes that have been described so far.
duke@435	149	GrowableArray<DIR_Chunk*>* _all_chunks;
duke@435	150	GrowableArray<DIR_Chunk*>* _shared_chunks;
duke@435	151	DIR_Chunk* _next_chunk;
duke@435	152	DIR_Chunk* _next_chunk_limit;
duke@435	153
duke@435	154	#ifdef ASSERT
duke@435	155	enum { rs_null, rs_safepoint, rs_non_safepoint };
duke@435	156	int _recording_state;
duke@435	157	#endif
duke@435	158
duke@435	159	PcDesc* _pcs;
duke@435	160	int _pcs_size;
duke@435	161	int _pcs_length;
duke@435	162	// Note: Would use GrowableArray<PcDesc>, but structs are not supported.
duke@435	163
duke@435	164	// PC of most recent real safepoint before the current one,
duke@435	165	// updated after end_scopes.
duke@435	166	int _prev_safepoint_pc;
duke@435	167
duke@435	168	PcDesc* last_pc() {
duke@435	169	guarantee(_pcs_length > 0, "a safepoint must be declared already");
duke@435	170	return &_pcs[_pcs_length-1];
duke@435	171	}
duke@435	172	PcDesc* prev_pc() {
duke@435	173	guarantee(_pcs_length > 1, "a safepoint must be declared already");
duke@435	174	return &_pcs[_pcs_length-2];
duke@435	175	}
duke@435	176	void add_new_pc_offset(int pc_offset);
duke@435	177	void end_scopes(int pc_offset, bool is_safepoint);
duke@435	178
duke@435	179	int serialize_monitor_values(GrowableArray<MonitorValue*>* monitors);
duke@435	180	int serialize_scope_values(GrowableArray<ScopeValue*>* values);
duke@435	181	int find_sharable_decode_offset(int stream_offset);
duke@435	182
duke@435	183	public:
duke@435	184	enum { serialized_null = 0 };
duke@435	185	};