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Wednesday, August 11, 2010

Inside The Java Virtual Machine

Part One: Java's Architecture
1 Introduction to Java's Architecture
Why Java?
The Architecture

The Java Virtual Machine
The Class Loader Architecture
The Java Class File
The Java API
The Java Programming Language

Architectural Tradeoffs
Future Trends
On the CD-ROM
The Resources Page
2 Platform independence
Why Platform Independence?
Java's Architectural Support for Platform Independence
Factors that Influence Platform Independence

The Java Platform
Native Methods
Other Factors

Seven Steps to Platform Independence
The Politics of Platform Independence
The Resources Page
3 Security
Why Security?
The Sandbox
The Class Loader Architecture
The Class File Verifier

Phase One: Internal Checks
Phase Two: Verification of Symbolic References

Safety Features Built Into the Java Virtual Machine
The Security Manager and the Java API
The Security API
Security Beyond the Architecture
The Resources Page
4 Network-mobility
Why Network Mobility?

A New Software Paradigm
Java's Architectural Support for Network-Mobility
The Applet: An Example of Network-Mobile Java
The Resources Page

Part Two: Java Internals
5 The Java Virtual Machine
What is a Java Virtual Machine?
The Lifetime of a Java Virtual Machine
The Architecture of the Java Virtual Machine

Data Types
Word Size
The Class Loader Subsystem

Loading, Linking and Initialization
The Primordial Class Loader
Class Loader Objects
Name Spaces

The Method Area

Type Information
The Constant Pool
Field Information
Method Information Class Variables
A Reference to Class ClassLoader
A Reference to Class Class
Method Tables
An Example of Method Area Use

The Heap

Garbage Collection
Object Representation
Array Representation

The Program Counter
The Java Stack
The Stack Frame

Local Variables
Operand Stack
Frame Data
Possible Implementations of the Java Stack

Native Method Stacks
Execution Engine

The Instruction Set
Execution Techniques

Native Method Interface

The Real Machine
Eternal Math: A Simulation
On the CD-ROM
The Resources Page
6 The Java Class File
What is a Java Class File?
What's in a Class File?
Special Strings

Fully Qualified Names
Simple Names

The Constant Pool

The CONSTANT_Utf8_info Table
The CONSTANT_Integer_info Table
The CONSTANT_Float_info Table
The CONSTANT_Long_info Table
The CONSTANT_Double_info Table
The CONSTANT_Class_info Table
The CONSTANT_String_info Table
The CONSTANT_Fieldref_info Table
The CONSTANT_Methodref_info Table
The CONSTANT_InterfaceMethodref_info Table
The CONSTANT_NameAndType_info Table


The Code Attribute
The ConstantValue Attribute
The Exceptions Attribute
The InnerClasses Attribute
The LineNumberTable Attribute
The LocalVariableTable Attribute
The SourceFile Attribute
The Synthetic Attribute

Getting Loaded: A Simulation
On the CD-ROM
The Resources Page
7 The Lifetime of a Class
Class Loading, Linking, and Initialization


The Class Initialization Method
Active versus Passive Use

The Lifetime of an Object

Class Instantiation
Garbage Collection and Finalization of Objects

Unloading and Finalization of Classes
On the CD-ROM
The Resources Page
8 The Linking Model
Dynamic Linking and Resolution
Resolution and Dynamic Extension
Constant Pool Resolution

Resolution of CONSTANT_Class_info Entries

Array Classes
Non-Array Classes and Interfaces

Resolution of CONSTANT_Fieldref_info Entries
Resolution of CONSTANT_Methodref_info Entries
Resolution of CONSTANT_InterfaceMethodref_info Entries
Resolution of CONSTANT_String_info Entries
Resolution of Other Types of Entries

Compile-Time Resolution of Constants
Direct References
_quick Instructions
Example: The Linking of the Salutation Application
Example: The Dynamic Extension of the Greet Application
Example: Unloading Unreachable Greeters
On the CD-ROM
The Resources Page
9 Garbage Collection
Why Garbage Collection?
Garbage Collection Algorithms
Reference Counting Collectors
Tracing Collectors
Compacting Collectors
Copying Collectors
Generational Collectors
Adaptive Collectors
Heap of Fish: A Simulation

Allocate Fish
Assign References
Garbage Collect
Compact Heap

On the CD-ROM
The Resources Page
10 Stack and Local Variable Operations
Pushing Constants Onto the Stack
Generic Stack Operations
Pushing Local Variables Onto the Stack
Popping to Local Variables
The wide Instruction
Fibonacci Forever: A Simulation
On the CD-ROM
The Resources Page
11 Type Conversion
The Conversion Opcodes
Conversion Diversion: A Simulation
On the CD-ROM
The Resources Page
12 Integer Arithmetic
Two's Complement Arithmetic
Inner Int: A Java int Reveals its Inner Nature
Arithmetic Opcodes
Prime Time: A Simulation
On the CD-ROM
The Resources Page
13 Logic
The Logic Opcodes
Logical Results: A Simulation
On the CD-ROM
The Resources Page
14 Floating Point Arithmetic

Floating Point Numbers
Inner Float: A Java float Reveals its Inner Nature
The Floating Point Opcodes
Circle of Squares: A Simulation
On the CD-ROM
The Resources Page
15 Objects and Arrays

A Refresher on Objects and Arrays
Opcodes for Objects
Opcodes for Arrays
Three-Dimensional Array: A Simulation
On the CD-ROM
The Resources Page
16 Control Flow
Conditional Branching
Unconditional Branching
Conditional Branching with Tables
Saying Tomato: A Simulation
On the CD-ROM
The Resources Page
17 Exceptions
Throwing and Catching Exceptions
The Exception Table
Play Ball!: A Simulation
On the CD-ROM
The Resources Page
18 Finally Clauses
Miniature Subroutines
Asymmetrical Invocation and Return
Hop Around: A Simulation
On the CD-ROM
The Resources Page
19 Method Invocation and Return
Method Invocation

Invoking a Java Method
Invoking a Native Method

Other Forms of Method Invocation
The invokespecial instruction

invokespecial and init()
invokespecial and Private Methods
invokespecial and super

The invokeinterface Instruction
Invocation Instructions and Speed
Examples of Method Invocation
Returning from Methods
On the CD-ROM
The Resources Page
20 Thread Synchronization
Object Locking
Synchronization Support in the Instruction Set

Synchronized Statements
Synchronized Methods

Coordination Support in Class Object
On the CD-ROM
The Resources Page
Appendix A. Instructions by Opcode Mnemonic
Appendix B. Opcode Mnemonic by Functional Group
Appendix C. Opcode Mnemonic by Opcode
Appendix D. Slices of Pi: A Simulation of the Java Virtual Machine
About the Author


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