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src/share/vm/memory/filemap.hpp@fc9d8850ab8b (annotated)

src/share/vm/memory/filemap.hpp

Fri, 23 Mar 2012 11:16:05 -0400

author

coleenp

date

Fri, 23 Mar 2012 11:16:05 -0400

changeset 3682

fc9d8850ab8b

parent 2314

f95d63e2154a

child 3900

d2a62e0f25eb

permissions

-rw-r--r--

7150058: Allocate symbols from null boot loader to an arena for NMT
Summary: Move symbol allocation to an arena so NMT doesn't have to track them at startup.
Reviewed-by: never, kamg, zgu

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2003, 2010, 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_MEMORY_FILEMAP_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_FILEMAP_HPP
stefank@2314	27
stefank@2314	28	#include "memory/compactingPermGenGen.hpp"
stefank@2314	29	#include "memory/space.hpp"
stefank@2314	30
duke@435	31	// Layout of the file:
duke@435	32	// header: dump of archive instance plus versioning info, datestamp, etc.
duke@435	33	// [magic # = 0xF00BABA2]
duke@435	34	// ... padding to align on page-boundary
duke@435	35	// read-write space from CompactingPermGenGen
duke@435	36	// read-only space from CompactingPermGenGen
duke@435	37	// misc data (block offset table, string table, symbols, dictionary, etc.)
duke@435	38	// tag(666)
duke@435	39
duke@435	40	static const int JVM_SHARED_JARS_MAX = 128;
duke@435	41	static const int JVM_SPACENAME_MAX = 128;
duke@435	42	static const int JVM_IDENT_MAX = 256;
duke@435	43	static const int JVM_ARCH_MAX = 12;
duke@435	44
duke@435	45
duke@435	46
duke@435	47	class FileMapInfo : public CHeapObj {
duke@435	48	private:
duke@435	49	enum {
duke@435	50	_invalid_version = -1,
duke@435	51	_current_version = 1
duke@435	52	};
duke@435	53
duke@435	54	bool _file_open;
duke@435	55	int _fd;
duke@435	56	long _file_offset;
duke@435	57
duke@435	58	// FileMapHeader describes the shared space data in the file to be
duke@435	59	// mapped. This structure gets written to a file. It is not a class, so
duke@435	60	// that the compilers don't add any compiler-private data to it.
duke@435	61
duke@435	62	struct FileMapHeader {
duke@435	63	int _magic; // identify file type.
duke@435	64	int _version; // (from enum, above.)
duke@435	65	size_t _alignment; // how shared archive should be aligned
duke@435	66
duke@435	67	struct space_info {
duke@435	68	int _file_offset; // sizeof(this) rounded to vm page size
duke@435	69	char* _base; // copy-on-write base address
duke@435	70	size_t _capacity; // for validity checking
duke@435	71	size_t _used; // for setting space top on read
duke@435	72	bool _read_only; // read only space?
duke@435	73	bool _allow_exec; // executable code in space?
duke@435	74	} _space[CompactingPermGenGen::n_regions];
duke@435	75
duke@435	76	// The following fields are all sanity checks for whether this archive
duke@435	77	// will function correctly with this JVM and the bootclasspath it's
duke@435	78	// invoked with.
duke@435	79	char _arch[JVM_ARCH_MAX]; // architecture
duke@435	80	char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm
duke@435	81	int _num_jars; // Number of jars in bootclasspath
duke@435	82
duke@435	83	// Per jar file data: timestamp, size.
duke@435	84
duke@435	85	struct {
duke@435	86	time_t _timestamp; // jar timestamp.
duke@435	87	long _filesize; // jar file size.
duke@435	88	} _jar[JVM_SHARED_JARS_MAX];
duke@435	89	} _header;
duke@435	90	const char* _full_path;
duke@435	91
duke@435	92	static FileMapInfo* _current_info;
duke@435	93
duke@435	94	bool init_from_file(int fd);
duke@435	95	void align_file_position();
duke@435	96
duke@435	97	public:
duke@435	98	FileMapInfo() {
duke@435	99	_file_offset = 0;
duke@435	100	_file_open = false;
duke@435	101	_header._version = _invalid_version;
duke@435	102	}
duke@435	103
duke@435	104	static int current_version() { return _current_version; }
duke@435	105	void populate_header(size_t alignment);
duke@435	106	bool validate();
duke@435	107	void invalidate();
duke@435	108	int version() { return _header._version; }
duke@435	109	size_t alignment() { return _header._alignment; }
duke@435	110	size_t space_capacity(int i) { return _header._space[i]._capacity; }
duke@435	111	char* region_base(int i) { return _header._space[i]._base; }
duke@435	112	struct FileMapHeader* header() { return &_header; }
duke@435	113
duke@435	114	static void set_current_info(FileMapInfo* info) { _current_info = info; }
duke@435	115	static FileMapInfo* current_info() { return _current_info; }
duke@435	116	static void assert_mark(bool check);
duke@435	117
duke@435	118	// File manipulation.
duke@435	119	bool initialize();
duke@435	120	bool open_for_read();
duke@435	121	void open_for_write();
duke@435	122	void write_header();
duke@435	123	void write_space(int i, CompactibleSpace* space, bool read_only);
duke@435	124	void write_region(int region, char* base, size_t size,
duke@435	125	size_t capacity, bool read_only, bool allow_exec);
duke@435	126	void write_bytes(const void* buffer, int count);
duke@435	127	void write_bytes_aligned(const void* buffer, int count);
duke@435	128	bool map_space(int i, ReservedSpace rs, ContiguousSpace *space);
duke@435	129	char* map_region(int i, ReservedSpace rs);
duke@435	130	char* map_region(int i, bool address_must_match);
duke@435	131	void unmap_region(int i);
duke@435	132	void close();
duke@435	133	bool is_open() { return _file_open; }
duke@435	134
duke@435	135	// JVM/TI RedefineClasses() support:
duke@435	136	// Remap the shared readonly space to shared readwrite, private.
duke@435	137	bool remap_shared_readonly_as_readwrite();
duke@435	138
duke@435	139	// Errors.
duke@435	140	static void fail_stop(const char *msg, ...);
duke@435	141	void fail_continue(const char *msg, ...);
duke@435	142
duke@435	143	// Return true if given address is in the mapped shared space.
duke@435	144	bool is_in_shared_space(const void* p);
duke@435	145	};
stefank@2314	146
stefank@2314	147	#endif // SHARE_VM_MEMORY_FILEMAP_HPP