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src/share/vm/runtime/perfMemory.hpp@2a33b32dd03c (annotated)

src/share/vm/runtime/perfMemory.hpp

Thu, 24 May 2018 19:24:53 +0800

author

aoqi

date

Thu, 24 May 2018 19:24:53 +0800

changeset 8861

2a33b32dd03c

parent 6876

710a3c8b516e

permissions

-rw-r--r--

#7046 Disable the compilation when branch offset is beyond short branch
Contributed-by: fujie, aoqi

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_RUNTIME_PERFMEMORY_HPP
aoqi@0	26	#define SHARE_VM_RUNTIME_PERFMEMORY_HPP
aoqi@0	27
aoqi@0	28	#include "utilities/exceptions.hpp"
aoqi@0	29
aoqi@0	30	/*
aoqi@0	31	* PerfData Version Constants
aoqi@0	32	* - Major Version - change whenever the structure of PerfDataEntry changes
aoqi@0	33	* - Minor Version - change whenever the data within the PerfDataEntry
aoqi@0	34	* structure changes. for example, new unit or variability
aoqi@0	35	* values are added or new PerfData subtypes are added.
aoqi@0	36	*/
aoqi@0	37	#define PERFDATA_MAJOR_VERSION 2
aoqi@0	38	#define PERFDATA_MINOR_VERSION 0
aoqi@0	39
aoqi@0	40	/* Byte order of the PerfData memory region. The byte order is exposed in
aoqi@0	41	* the PerfData memory region as the data in the memory region may have
aoqi@0	42	* been generated by a little endian JVM implementation. Tracking the byte
aoqi@0	43	* order in the PerfData memory region allows Java applications to adapt
aoqi@0	44	* to the native byte order for monitoring purposes. This indicator is
aoqi@0	45	* also useful when a snapshot of the PerfData memory region is shipped
aoqi@0	46	* to a machine with a native byte order different from that of the
aoqi@0	47	* originating machine.
aoqi@0	48	*/
aoqi@0	49	#define PERFDATA_BIG_ENDIAN 0
aoqi@0	50	#define PERFDATA_LITTLE_ENDIAN 1
aoqi@0	51
aoqi@0	52	/*
aoqi@0	53	* The PerfDataPrologue structure is known by the PerfDataBuffer Java class
aoqi@0	54	* libraries that read the PerfData memory region. The size and the position
aoqi@0	55	* of the fields must be changed along with their counterparts in the
aoqi@0	56	* PerfDataBuffer Java class. The first four bytes of this structure
aoqi@0	57	* should never change, or compatibility problems between the monitoring
aoqi@0	58	* applications and Hotspot VMs will result. The reserved fields are
aoqi@0	59	* available for future enhancements.
aoqi@0	60	*/
aoqi@0	61	typedef struct {
aoqi@0	62	jint magic; // magic number - 0xcafec0c0
aoqi@0	63	jbyte byte_order; // byte order of the buffer
aoqi@0	64	jbyte major_version; // major and minor version numbers
aoqi@0	65	jbyte minor_version;
aoqi@0	66	jbyte accessible; // ready to access
aoqi@0	67	jint used; // number of PerfData memory bytes used
aoqi@0	68	jint overflow; // number of bytes of overflow
aoqi@0	69	jlong mod_time_stamp; // time stamp of last structural modification
aoqi@0	70	jint entry_offset; // offset of the first PerfDataEntry
aoqi@0	71	jint num_entries; // number of allocated PerfData entries
aoqi@0	72	} PerfDataPrologue;
aoqi@0	73
aoqi@0	74	/* The PerfDataEntry structure defines the fixed portion of an entry
aoqi@0	75	* in the PerfData memory region. The PerfDataBuffer Java libraries
aoqi@0	76	* are aware of this structure and need to be changed when this
aoqi@0	77	* structure changes.
aoqi@0	78	*/
aoqi@0	79	typedef struct {
aoqi@0	80
aoqi@0	81	jint entry_length; // entry length in bytes
aoqi@0	82	jint name_offset; // offset of the data item name
aoqi@0	83	jint vector_length; // length of the vector. If 0, then scalar
aoqi@0	84	jbyte data_type; // type of the data item -
aoqi@0	85	// 'B','Z','J','I','S','C','D','F','V','L','['
aoqi@0	86	jbyte flags; // flags indicating misc attributes
aoqi@0	87	jbyte data_units; // unit of measure for the data type
aoqi@0	88	jbyte data_variability; // variability classification of data type
aoqi@0	89	jint data_offset; // offset of the data item
aoqi@0	90
aoqi@0	91	/*
aoqi@0	92	body of PerfData memory entry is variable length
aoqi@0	93
aoqi@0	94	jbyte[name_length] data_name; // name of the data item
aoqi@0	95	jbyte[pad_length] data_pad; // alignment of data item
aoqi@0	96	j<data_type>[data_length] data_item; // array of appropriate types.
aoqi@0	97	// data_length is > 1 only when the
aoqi@0	98	// data_type is T_ARRAY.
aoqi@0	99	*/
aoqi@0	100	} PerfDataEntry;
aoqi@0	101
aoqi@0	102	// Prefix of performance data file.
aoqi@0	103	extern const char PERFDATA_NAME[];
aoqi@0	104
aoqi@0	105	// UINT_CHARS contains the number of characters holding a process id
aoqi@0	106	// (i.e. pid). pid is defined as unsigned "int" so the maximum possible pid value
aoqi@0	107	// would be 2^32 - 1 (4294967295) which can be represented as a 10 characters
aoqi@0	108	// string.
aoqi@0	109	static const size_t UINT_CHARS = 10;
aoqi@0	110
aoqi@0	111	/* the PerfMemory class manages creation, destruction,
aoqi@0	112	* and allocation of the PerfData region.
aoqi@0	113	*/
aoqi@0	114	class PerfMemory : AllStatic {
aoqi@0	115	friend class VMStructs;
aoqi@0	116	private:
aoqi@0	117	static char* _start;
aoqi@0	118	static char* _end;
aoqi@0	119	static char* _top;
aoqi@0	120	static size_t _capacity;
aoqi@0	121	static PerfDataPrologue* _prologue;
aoqi@0	122	static jint _initialized;
aoqi@0	123
aoqi@0	124	static void create_memory_region(size_t sizep);
aoqi@0	125	static void delete_memory_region();
aoqi@0	126
aoqi@0	127	public:
aoqi@0	128	enum PerfMemoryMode {
aoqi@0	129	PERF_MODE_RO = 0,
aoqi@0	130	PERF_MODE_RW = 1
aoqi@0	131	};
aoqi@0	132
aoqi@0	133	static char* alloc(size_t size);
aoqi@0	134	static char* start() { return _start; }
aoqi@0	135	static char* end() { return _end; }
aoqi@0	136	static size_t used() { return (size_t) (_top - _start); }
aoqi@0	137	static size_t capacity() { return _capacity; }
aoqi@0	138	static bool is_initialized() { return _initialized != 0; }
aoqi@0	139	static bool contains(char* addr) {
aoqi@0	140	return ((_start != NULL) && (addr >= _start) && (addr < _end));
aoqi@0	141	}
aoqi@0	142	static void mark_updated();
aoqi@0	143
aoqi@0	144	// methods for attaching to and detaching from the PerfData
aoqi@0	145	// memory segment of another JVM process on the same system.
aoqi@0	146	static void attach(const char* user, int vmid, PerfMemoryMode mode,
aoqi@0	147	char** addrp, size_t* size, TRAPS);
aoqi@0	148	static void detach(char* addr, size_t bytes, TRAPS);
aoqi@0	149
aoqi@0	150	static void initialize();
aoqi@0	151	static void destroy();
aoqi@0	152	static void set_accessible(bool value) {
aoqi@0	153	if (UsePerfData) {
aoqi@0	154	_prologue->accessible = value;
aoqi@0	155	}
aoqi@0	156	}
aoqi@0	157
aoqi@0	158	// filename of backing store or NULL if none.
aoqi@0	159	static char* backing_store_filename();
aoqi@0	160
aoqi@0	161	// returns the complete file path of hsperfdata.
aoqi@0	162	// the caller is expected to free the allocated memory.
aoqi@0	163	static char* get_perfdata_file_path();
aoqi@0	164	};
aoqi@0	165
aoqi@0	166	void perfMemory_init();
aoqi@0	167	void perfMemory_exit();
aoqi@0	168
aoqi@0	169	#endif // SHARE_VM_RUNTIME_PERFMEMORY_HPP