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src/share/vm/runtime/vmStructs.hpp@c6ff24ceec1c (annotated)

src/share/vm/runtime/vmStructs.hpp

Thu, 10 Apr 2008 15:49:16 -0400

author

sbohne

date

Thu, 10 Apr 2008 15:49:16 -0400

changeset 528

c6ff24ceec1c

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6686407: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
Summary: Stack allocated VM_EnableBiasedLocking op must be marked as such
Reviewed-by: xlu, acorn, never, dholmes

duke@435	1	/*
duke@435	2	* Copyright 2000-2001 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	// This table encapsulates the debugging information required by the
duke@435	26	// serviceability agent in order to run. Specifically, we need to
duke@435	27	// understand the layout of certain C data structures (offsets, in
duke@435	28	// bytes, of their fields.)
duke@435	29	//
duke@435	30	// There are alternatives for the design of this mechanism, including
duke@435	31	// parsing platform-specific debugging symbols from a debug build into
duke@435	32	// a program database. While this current mechanism can be considered
duke@435	33	// to be a workaround for the inability to debug arbitrary C and C++
duke@435	34	// programs at the present time, it does have certain advantages.
duke@435	35	// First, it is platform-independent, which will vastly simplify the
duke@435	36	// initial bringup of the system both now and on future platforms.
duke@435	37	// Second, it is embedded within the VM, as opposed to being in a
duke@435	38	// separate program database; experience has shown that whenever
duke@435	39	// portions of a system are decoupled, version skew is problematic.
duke@435	40	// Third, generating a program database, for example for a product
duke@435	41	// build, would probably require two builds to be done: the desired
duke@435	42	// product build as well as an intermediary build with the PRODUCT
duke@435	43	// flag turned on but also compiled with -g, leading to a doubling of
duke@435	44	// the time required to get a serviceability agent-debuggable product
duke@435	45	// build. Fourth, and very significantly, this table probably
duke@435	46	// preserves more information about field types than stabs do; for
duke@435	47	// example, it preserves the fact that a field is a "jlong" rather
duke@435	48	// than transforming the type according to the typedef in jni_md.h,
duke@435	49	// which allows the Java-side code to identify "Java-sized" fields in
duke@435	50	// C++ data structures. If the symbol parsing mechanism was redone
duke@435	51	// using stabs, it might still be necessary to have a table somewhere
duke@435	52	// containing this information.
duke@435	53	//
duke@435	54	// Do not change the sizes or signedness of the integer values in
duke@435	55	// these data structures; they are fixed over in the serviceability
duke@435	56	// agent's Java code (for bootstrapping).
duke@435	57
duke@435	58	typedef struct {
duke@435	59	const char* typeName; // The type name containing the given field (example: "Klass")
duke@435	60	const char* fieldName; // The field name within the type (example: "_name")
duke@435	61	const char* typeString; // Quoted name of the type of this field (example: "symbolOopDesc*";
duke@435	62	// parsed in Java to ensure type correctness
duke@435	63	int32_t isStatic; // Indicates whether following field is an offset or an address
duke@435	64	uint64_t offset; // Offset of field within structure; only used for nonstatic fields
duke@435	65	void* address; // Address of field; only used for static fields
duke@435	66	// ("offset" can not be reused because of apparent SparcWorks compiler bug
duke@435	67	// in generation of initializer data)
duke@435	68	} VMStructEntry;
duke@435	69
duke@435	70	typedef struct {
duke@435	71	const char* typeName; // Type name (example: "methodOopDesc")
duke@435	72	const char* superclassName; // Superclass name, or null if none (example: "oopDesc")
duke@435	73	int32_t isOopType; // Does this type represent an oop typedef? (i.e., "methodOop" or
duke@435	74	// "klassOop", but NOT "methodOopDesc")
duke@435	75	int32_t isIntegerType; // Does this type represent an integer type (of arbitrary size)?
duke@435	76	int32_t isUnsigned; // If so, is it unsigned?
duke@435	77	uint64_t size; // Size, in bytes, of the type
duke@435	78	} VMTypeEntry;
duke@435	79
duke@435	80	typedef struct {
duke@435	81	const char* name; // Name of constant (example: "_thread_in_native")
duke@435	82	int32_t value; // Value of constant
duke@435	83	} VMIntConstantEntry;
duke@435	84
duke@435	85	typedef struct {
duke@435	86	const char* name; // Name of constant (example: "_thread_in_native")
duke@435	87	uint64_t value; // Value of constant
duke@435	88	} VMLongConstantEntry;
duke@435	89
duke@435	90	// This class is a friend of most classes, to be able to access
duke@435	91	// private fields
duke@435	92	class VMStructs {
duke@435	93	public:
duke@435	94	// The last entry is identified over in the serviceability agent by
duke@435	95	// the fact that it has a NULL fieldName
duke@435	96	static VMStructEntry localHotSpotVMStructs[];
duke@435	97
duke@435	98	// The last entry is identified over in the serviceability agent by
duke@435	99	// the fact that it has a NULL typeName
duke@435	100	static VMTypeEntry localHotSpotVMTypes[];
duke@435	101
duke@435	102	// Table of integer constants required by the serviceability agent.
duke@435	103	// The last entry is identified over in the serviceability agent by
duke@435	104	// the fact that it has a NULL typeName
duke@435	105	static VMIntConstantEntry localHotSpotVMIntConstants[];
duke@435	106
duke@435	107	// Table of long constants required by the serviceability agent.
duke@435	108	// The last entry is identified over in the serviceability agent by
duke@435	109	// the fact that it has a NULL typeName
duke@435	110	static VMLongConstantEntry localHotSpotVMLongConstants[];
duke@435	111
duke@435	112	// This is used to run any checking code necessary for validation of
duke@435	113	// the data structure (debug build only)
duke@435	114	static void init();
duke@435	115
duke@435	116	private:
duke@435	117	// Look up a type in localHotSpotVMTypes using strcmp() (debug build only).
duke@435	118	// Returns 1 if found, 0 if not.
duke@435	119	// debug_only(static int findType(const char* typeName);)
duke@435	120	static int findType(const char* typeName);
duke@435	121	};