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JDK 19 Java虚拟机指南:最新官方发布
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更新于2024-06-22
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《JDK19 Java虚拟机指南》是一份详细的文档,它属于Java Platform, Standard Edition(Java SE)的官方发布,编号为F57114-01,发布日期为2022年9月。这份指南涵盖了Java虚拟机(JVM)在Java 19版本中的关键特性和优化,它是Oracle公司及其关联机构的知识产权,受到严格的许可证协议控制,仅允许在授权范围内使用。 该文档强调了用户必须遵守的法律限制,除非在许可协议中有明确的规定或法律允许,否则禁止进行任何形式的复制、修改、分发、逆向工程、解码等操作。软件及其相关文档的使用可能受到联邦采购法规(Federal Acquisition Regulation)的约束,如果软件、文档数据或者相关的技术资料被提供给美国政府或其他代理购买者,可能需要额外的处理流程。 《Java Virtual Machine Guide, Release 19》包含了对Java 19新特性如性能提升、内存管理优化、并发模型改进等内容的深入解析,有助于开发人员更好地理解和利用这些新功能来提高应用程序的效率和可靠性。此外,文档还可能涉及JVM的低级原理,如垃圾回收机制、类加载器体系、热点代码区域、JIT编译器等方面,这些都是理解现代Java应用程序运行的关键组成部分。 值得注意的是,由于文档可能存在更新,用户在使用时应确保获取最新的版本,并且如果发现任何错误或问题,应通过书面形式向Oracle报告,以便及时修复和改进。这份指南是Java开发者不可或缺的学习和参考资源,对于深入理解Java 19 JVM和优化Java应用具有重要的指导价值。
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Table 2-2 (Cont.) C2 Exclusive Options
Option Description Value Type Default Value
MaxNodeLimit
Sets the maximum
number of nodes to use
during a single method’s
compilation.
intx 80000
A
ccstr
value type is a method pattern. See Writing a Method Pattern in a Compiler
Directive.
The default directive supplies default values for compiler options. See What Is the Default
Directive?
Writing a Directive File
Individual compiler directives are written in a directives file. Only directive files, not individual
directives, can be added to the stack of active directives.
1. Create a file with a
.json
extension. Directive files are written using a subset of JSON
syntax with minor additions and deviations.
2. Add the following syntax as a template you can work from:
[ //Array of Directives
{ //Directive Block
//Directive 1
},
{ //Directive Block
//Directive 2
},
]
The components of this template are:
Array of Directives
• A directives file stores an array of directive blocks, denoted with a pair of brackets
(
[]
).
• The brackets are optional if the file contains only a single directive block.
Directive Block
• A block is denoted with a pair of braces (
{}
).
• A block contains one individual directive.
• A directives file can contain any number of directive blocks.
• Blocks are separated with a comma (
,
).
• A comma is optional following the final block in the array.
Directive
• Each directive must be within a directive block.
Chapter 2
Writing Directives
2-5
![](https://csdnimg.cn/release/download_crawler_static/88184820/bge.jpg)
• A directives file can contain multiple directives when it contains multiple
directive blocks.
Comments
• Single-line comments are preceded with two slashes (
//
).
• Multiline comments are not allowed.
3. Add or remove directive blocks from the template to match the number of
directives you want in the directives file.
4. In each directive block, write one compiler directive. See Writing a Compiler
Directive.
5. Reorder the directive blocks if necessary. The ordering of directives in a file is
significant. Directives written closer to the beginning of the array receive higher
priority. For more information, see How Directives Are Ordered in the Directives
Stack? and How Directives are Applied to Code?
[ //Array of directives
{ //Directive Block
//Directive 1
match: ["java*.*", "oracle*.*"],
c1: {
Enable: true,
Exclude: true,
BreakAtExecute: true,
},
c2: {
Enable: false,
MaxNodeLimit: 1000,
},
BreakAtCompile: true,
DumpReplay: true,
},
{ //Directive Block
//Directive 2
match: ["*Concurrent.*"],
c2: {
Exclude:true,
},
},
]
Writing a Compiler Directive
You must write a compiler directive within a directives file. You can repeat the following
steps for each individual compiler directive that you want to write in a directives file.
An individual compiler directive is written within a directive block in a directives file.
See Writing a Directive File.
Chapter 2
Writing Directives
2-6
![](https://csdnimg.cn/release/download_crawler_static/88184820/bgf.jpg)
1. Insert the following block of code, as a template you can work from, to write an individual
compiler directive. This block of code is a directive block.
{
match: [],
c1: {
//c1 directive options
},
c2: {
//c2 directive options
},
//Directive options applicable to all compilers
},
2. Provide the
match
attribute with an array of method patterns. See Writing a Method
Pattern in a Compiler Directive.
For example:
match: ["java*.*", "oracle*.*"],
3. Provide the
c1
attribute with a block of comma-separated directive options. Ensure that
these options are valid for the c1 compiler.
For example:
c1: {
Enable: true,
Exclude: true,
BreakAtExecute: true,
},
4. Provide the
c2
attribute with a block of comma-separated directive options. This block
can contain a mix of common and c2-exclusive compiler options.
For example:
c2: {
Enable: false,
MaxNodeLimit: 1000,
},
5. Provide, at the end of the directive, options you want applicable to all compilers. These
options are considered written within the scope of the common block. Options are
comma-separated.
For example:
BreakAtCompile: true,
DumpReplay: true,
6. Clean up the file by completing the following steps.
a. Check for the duplication of directive options. If a conflict occurs, then the last
occurrence of an option takes priority. Conflicts typically occur between the common
block and the c1 or c2 blocks, not between the c1 and c2 blocks.
Chapter 2
Writing Directives
2-7
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