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JDK9-JSE-Java Virtual Machine Guide-67.pdf
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JDK9-JSE-Java Virtual Machine Guide-67
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Java Platform, Standard Edition
Java Virtual Machine Guide
Release 9
E68512-05
October 2017
Java Platform, Standard Edition Java Virtual Machine Guide, Release 9
E68512-05
Copyright © 1993, 2017, Oracle and/or its affiliates. All rights reserved.
This software and related documentation are provided under a license agreement containing restrictions on
use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your
license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify,
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Reverse engineering, disassembly, or decompilation of this software, unless required by law for
interoperability, is prohibited.
The information contained herein is subject to change without notice and is not warranted to be error-free. If
you find any errors, please report them to us in writing.
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Contents
Preface
Audience vi
Documentation Accessibility vi
Related Documents vi
Conventions vi
1
Java Virtual Machine Technology Overview
2
Compiler Control
Writing Directives 2-1
List of Compiler Control Options 2-2
Writing a Directives File 2-5
Writing a Compiler Directive 2-6
Writing a Method Pattern in a Compiler Directive 2-8
Writing an Inline Directive Option 2-9
Preventing Duplication with the Enable Option 2-9
Understanding Directives Better 2-11
What Is the Default Directive? 2-11
How Are Directives Applied to Code? 2-13
Compiler Control and Backward Compatibility 2-14
Commands to Work with Directive Files 2-15
Compiler Directives and the Command Line 2-15
Compiler Directives and Diagnostic Commands 2-16
Getting Your Java Process Identification Number 2-16
Adding Directives Through Diagnostic Commands 2-16
Removing Directives Through Diagnostic Commands 2-16
Printing Directives Through Diagnostic Commands 2-17
How Are Directives Ordered in the Directives Stack? 2-17
iii
3
Garbage Collection
4
Class Data Sharing
Overview of Class Data Sharing 4-1
Regenerating the Shared Archive 4-2
Manually Controlling Class Data Sharing 4-2
5
Java HotSpot Virtual Machine Performance Enhancements
Compact Strings 5-1
Tiered Compilation 5-2
Compressed Ordinary Object Pointer 5-2
Zero-Based Compressed Ordinary Object Pointers 5-3
Escape Analysis 5-3
6
Support for Non-Java Languages
Introduction to Non-Java Language Features 6-1
Static and Dynamic Typing 6-2
Statically-Typed Languages Are Not Necessarily Strongly-Typed Languages 6-3
The Challenge of Compiling Dynamically-Typed Languages 6-3
The invokedynamic Instruction 6-5
Defining the Bootstrap Method 6-6
Specifying Constant Pool Entries 6-6
Example Constant Pool 6-7
Using the invokedynamic Instruction 6-8
7
Signal Chaining
8
Native Memory Tracking
Key Features 8-1
Using Native Memory Tracking 8-1
Enabling NMT 8-1
Accessing NMT Data using jcmd 8-2
Obtaining NMT Data at VM Exit 8-2
iv
9
DTrace Probes in HotSpot VM
Using the hotspot Provider 9-1
VM Lifecycle Probes 9-1
Thread Lifecycle Probes 9-2
Classloading Probes 9-2
Garbage Collection Probes 9-3
Method Compilation Probes 9-4
Monitor Probes 9-5
Application Tracking Probes 9-6
Using the hotspot_jni Provider 9-7
Sample DTrace Probes 9-7
10
Fatal Error Reporting
Error Report Example 10-1
11
Java Virtual Machine Related Resources
Tools 11-1
v
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