Java virtual machine - Revision history

Vincent Lefèvre: Undid revision 1292686339 by 184.103.37.139 (talk)

2025-05-28T14:54:07Z

Undid revision 1292686339 by 184.103.37.139 (talk)

← Previous revision		Revision as of 14:54, 28 May 2025
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	The JVM has a garbage-collected heap for storing objects and arrays. Code, constants, and other class data are stored in the "method area". The method area is logically part of the heap, but implementations may treat the method area separately from the heap, and for example might not garbage collect it. Each JVM thread also has its own [[call stack]] (called a "Java Virtual Machine stack" for clarity), which stores [[Call stack#STACK-FRAME\|frames]]. A new frame is created each time a method is called, and the frame is destroyed when that method exits.		The JVM has a garbage-collected heap for storing objects and arrays. Code, constants, and other class data are stored in the "method area". The method area is logically part of the heap, but implementations may treat the method area separately from the heap, and for example might not garbage collect it. Each JVM thread also has its own [[call stack]] (called a "Java Virtual Machine stack" for clarity), which stores [[Call stack#STACK-FRAME\|frames]]. A new frame is created each time a method is called, and the frame is destroyed when that method exits.

	Each frame provides an "operand stack" and an array of "local variables". The operand stack is used for operands to run computations and for receiving the return value of a called method, while local variables serve the same purpose as [[~~Processors~~ \|~~process~~]] and are also used to pass method arguments. Thus, the JVM is both a [[stack machine]] and a [[register machine]]. In practice, HotSpot eliminates every stack besides the native thread/call stack even when running in Interpreted mode, as its Templating Interpreter technically functions as a compiler.		Each frame provides an "operand stack" and an array of "local variables". The operand stack is used for operands to run computations and for receiving the return value of a called method, while local variables serve the same purpose as [[Processor register\|registers]] and are also used to pass method arguments. Thus, the JVM is both a [[stack machine]] and a [[register machine]]. In practice, HotSpot eliminates every stack besides the native thread/call stack even when running in Interpreted mode, as its Templating Interpreter technically functions as a compiler.

	===Bytecode instructions===		===Bytecode instructions===

184.103.37.139: /** * Calculates the sale price of a value at a given discount. * The sale price is formatted as US dollars. * * @param {number} input The value to discount. * @param {number} discount The discount to apply, such as .5 or 50%. * @return The sale price formatted as USD. * @customfunction / function salePrice(input, discount) { let price = input - (input discount); let dollarUS = Intl.NumberFormat("en-US", { style: "currency", currency: "USD", }); return dollarUS.format(pr

2025-05-28T07:59:28Z

* * Calculates the sale price of a value at a given discount. * The sale price is formatted as US dollars. * * @param {number} input The value to discount. * @param {number} discount The discount to apply, such as .5 or 50%. * @return The sale price formatted as USD. * @customfunction: function salePrice(input, discount) { let price = input - (input * discount); let dollarUS = Intl.NumberFormat("en-US", { style: "currency", currency: "USD", }); return dollarUS.format(pr

← Previous revision		Revision as of 07:59, 28 May 2025
Line 86:		Line 86:
	The JVM has a garbage-collected heap for storing objects and arrays. Code, constants, and other class data are stored in the "method area". The method area is logically part of the heap, but implementations may treat the method area separately from the heap, and for example might not garbage collect it. Each JVM thread also has its own [[call stack]] (called a "Java Virtual Machine stack" for clarity), which stores [[Call stack#STACK-FRAME\|frames]]. A new frame is created each time a method is called, and the frame is destroyed when that method exits.		The JVM has a garbage-collected heap for storing objects and arrays. Code, constants, and other class data are stored in the "method area". The method area is logically part of the heap, but implementations may treat the method area separately from the heap, and for example might not garbage collect it. Each JVM thread also has its own [[call stack]] (called a "Java Virtual Machine stack" for clarity), which stores [[Call stack#STACK-FRAME\|frames]]. A new frame is created each time a method is called, and the frame is destroyed when that method exits.

	Each frame provides an "operand stack" and an array of "local variables". The operand stack is used for operands to run computations and for receiving the return value of a called method, while local variables serve the same purpose as [[~~Processor~~ ~~register~~\|~~registers~~]] and are also used to pass method arguments. Thus, the JVM is both a [[stack machine]] and a [[register machine]]. In practice, HotSpot eliminates every stack besides the native thread/call stack even when running in Interpreted mode, as its Templating Interpreter technically functions as a compiler.		Each frame provides an "operand stack" and an array of "local variables". The operand stack is used for operands to run computations and for receiving the return value of a called method, while local variables serve the same purpose as [[Processors \|process]] and are also used to pass method arguments. Thus, the JVM is both a [[stack machine]] and a [[register machine]]. In practice, HotSpot eliminates every stack besides the native thread/call stack even when running in Interpreted mode, as its Templating Interpreter technically functions as a compiler.

	===Bytecode instructions===		===Bytecode instructions===

92.85.80.120: /* JVM specification */ Removed outdated information about Rockit

2025-05-25T11:19:27Z

JVM specification: Removed outdated information about Rockit

← Previous revision		Revision as of 11:19, 25 May 2025
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	{{Blockquote\|[[Sun Microsystems\|We]] intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine.}}		{{Blockquote\|[[Sun Microsystems\|We]] intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine.}}

			The most commonly used Java virtual machine is Oracle's [[HotSpot (virtual machine)\|HotSpot]].
⚫	~~One of Oracle's JVMs is named HotSpot; the other, inherited from [[BEA Systems]], is [[JRockit]].~~ Oracle owns the Java trademark and may allow its use to certify implementation suites as fully compatible with Oracle's specification.

		⚫	Oracle owns the Java trademark and may allow its use to certify implementation suites as fully compatible with Oracle's specification.

	===Garbage collectors===		===Garbage collectors===

Xose.vazquez: /* Garbage collectors */

2025-05-17T16:09:03Z

Garbage collectors

← Previous revision		Revision as of 16:09, 17 May 2025
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	! Version !! Default GC !! Available GCs		! Version !! Default GC !! Available GCs
	\|-		\|-
	\| 6u14 \|\| rowspan="2" \| Serial /<br />Parallel ([[Multiprocessor system architecture\|MP]]) \|\| Serial, Parallel, ''[[Garbage-first collector\|G1]] (E)''~~, [[Concurrent mark sweep collector\|CMS]]~~		\| 6u14 \|\| rowspan="2" \| Serial /<br />Parallel ([[Multiprocessor system architecture\|MP]]) \|\| Serial, Parallel, [[Concurrent mark sweep collector\|CMS]], ''[[Garbage-first collector\|G1]] (E)''
	\|-		\|-
	\| 7u4 - 8 \|\| rowspan="2" \| Serial, Parallel, G1, ~~CMS~~		\| 7u4 - 8 \|\| rowspan="2" \| Serial, Parallel, CMS, G1
	\|-		\|-
	\| 9 - 10 \|\| rowspan="8" \| G1		\| 9 - 10 \|\| rowspan="8" \| G1
	\|-		\|-
	\| 11 \|\| Serial, Parallel, G1, ~~CMS~~, ''Epsilon (E)'', ''ZGC (E)''		\| 11 \|\| Serial, Parallel, CMS, G1, ''Epsilon (E)'', ''ZGC (E)''
	\|-		\|-
	\| 12 - 13 \|\| Serial, Parallel, G1, ~~CMS~~, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 12 - 13 \|\| Serial, Parallel, CMS, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''

Xose.vazquez: /* Garbage collectors */

2025-04-06T19:02:05Z

Garbage collectors

← Previous revision		Revision as of 19:02, 6 April 2025
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	! Version !! Default GC !! Available GCs		! Version !! Default GC !! Available GCs
	\|-		\|-
	\| 6u14 \|\| rowspan="2" \| Parallel \|\| Serial, Parallel, ''[[Garbage-first collector\|G1]] (E)'', [[Concurrent mark sweep collector\|CMS]]		\| 6u14 \|\| rowspan="2" \| Serial /<br />Parallel ([[Multiprocessor system architecture\|MP]]) \|\| Serial, Parallel, ''[[Garbage-first collector\|G1]] (E)'', [[Concurrent mark sweep collector\|CMS]]
	\|-		\|-
	\| 7u4 - 8 \|\| rowspan="2" \| Serial, Parallel, G1, CMS		\| 7u4 - 8 \|\| rowspan="2" \| Serial, Parallel, G1, CMS

Xose.vazquez: /* Garbage collectors */

2025-04-06T18:53:58Z

Garbage collectors

← Previous revision		Revision as of 18:53, 6 April 2025
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	\| 9 - 10 \|\| rowspan="8" \| G1		\| 9 - 10 \|\| rowspan="8" \| G1
	\|-		\|-
	\| 11 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)''		\| 11 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)''
	\|-		\|-
	\| 12 - 13 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 12 - 13 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
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	\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 15 - 20 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah		\| 15 - 20 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah
	\|-		\|-
	\| 21 - 22 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''		\| 21 - 22 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''
	\|-		\|-
	\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)		\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)

Xose.vazquez: /* Garbage collectors */

2025-04-06T18:53:04Z

Garbage collectors

← Previous revision		Revision as of 18:53, 6 April 2025
Line 39:		Line 39:
	! Version !! Default GC !! Available GCs		! Version !! Default GC !! Available GCs
	\|-		\|-
	\| ~~8 \|\| Parallel~~ \|\| rowspan="2" \| Serial, Parallel, [[Garbage-first collector\|G1]], [[Concurrent mark sweep collector\|CMS]]		\| 6u14 \|\| rowspan="2" \| Parallel \|\| Serial, Parallel, ''[[Garbage-first collector\|G1]] (E)'', [[Concurrent mark sweep collector\|CMS]]
	\|-		\|-
	\| 9-10 \|\| rowspan="8" \| G1		\| 7u4 - 8 \|\| rowspan="2" \| Serial, Parallel, G1, CMS
			\|-
			\| 9 - 10 \|\| rowspan="8" \| G1
	\|-		\|-
	\| 11 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)''		\| 11 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)''
	\|-		\|-
	\| 12-13 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 12 - 13 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''		\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 15-20 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah		\| 15 - 20 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah
	\|-		\|-
	\| 21-22 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''		\| 21 - 22 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''
	\|-		\|-
	\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)		\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)

Xose.vazquez: /* Garbage collectors */

2025-04-06T15:00:12Z

Garbage collectors

← Previous revision		Revision as of 15:00, 6 April 2025
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	\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)		\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)
	\|-		\|-
	\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''~~GenShenandoah~~ (E)''		\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShen (E)''
	\|-		\|-
	\| colspan="3" \| <small> ''(E)'' = ''experimental''</small>		\| colspan="3" \| <small> ''(E)'' = ''experimental''</small>

Xose.vazquez: /* Garbage collectors */

2025-04-05T09:42:02Z

Garbage collectors

← Previous revision		Revision as of 09:42, 5 April 2025
Line 39:		Line 39:
	! Version !! Default GC !! Available GCs		! Version !! Default GC !! Available GCs
	\|-		\|-
	\| 8 \|\| Parallel \|\| rowspan="2" \| Serial, Parallel, [[~~Concurrent mark sweep~~ collector\|~~CMS~~]], [[~~Garbage-first~~ collector\|G1]]		\| 8 \|\| Parallel \|\| rowspan="2" \| Serial, Parallel, [[Garbage-first collector\|G1]], [[Concurrent mark sweep collector\|CMS]]
	\|-		\|-
	\| 9-10 \|\| rowspan="8" \| G1		\| 9-10 \|\| rowspan="8" \| G1
	\|-		\|-
	\| 11 \|\| Serial, Parallel, ~~CMS~~, G1, ''~~ZGC~~ (E)'', ''~~Epsilon~~ (E)''		\| 11 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)''
	\|-		\|-
	\| 12-13 \|\| Serial, Parallel, ~~CMS~~, G1, ''~~ZGC~~ (E)'', ''~~Epsilon~~ (E)'', ''Shenandoah (E)''		\| 12-13 \|\| Serial, Parallel, G1, CMS, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 14 \|\| Serial, Parallel, G1, ''~~ZGC~~ (E)'', ''~~Epsilon~~ (E)'', ''Shenandoah (E)''		\| 14 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
	\|-		\|-
	\| 15-20 \|\| Serial, Parallel, G1~~, ZGC~~, ''Epsilon (E)'', Shenandoah		\| 15-20 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah
	\|-		\|-
	\| 21-22 \|\| Serial, Parallel, G1~~, ZGC~~, ''Epsilon (E)'', Shenandoah, ''GenZGC (E)''		\| 21-22 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''
	\|-		\|-
	\| 23 \|\| Serial, Parallel, G1~~, ZGC~~, ''Epsilon (E)'', Shenandoah, GenZGC (default ZGC)		\| 23 \|\| Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)
	\|-		\|-
	\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShenandoah (E)''		\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShenandoah (E)''

Bruce1ee: fixed lint errors – missing end tag

2025-04-04T23:30:08Z

fixed lint errors – missing end tag

← Previous revision		Revision as of 23:30, 4 April 2025
Line 57:		Line 57:
	\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShenandoah (E)''		\| 24 \|\| Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShenandoah (E)''
	\|-		\|-
	\| colspan="3" \| <small> ''(E)'' = ''experimental''		\| colspan="3" \| <small> ''(E)'' = ''experimental''</small>
	\|}		\|}