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公開日:2022/07/04 / 最終更新日:2022/07/04

Java Virtual Machine Specifications was written as a full document which helps the developing of the Java virtual machine. It is essential for compiler writers who wish to target the Java virtual machine and for programmers who want to implement a compatible Java virtual machine. It is also a definitive source for anyone who wants to know exactly how the Java programming language is implemented.
The Java virtual machine is an abstract machine. References to the Java virtual machine throughout this specification refer to this abstract machine rather than to Sun’s or any other specific implementation. This book serves as documentation for a concrete implementation of the Java virtual machine only as a blueprint documents a house. An implementation of the Java virtual machine (known as a runtime interpreter) must embody this specification, but is constrained by it only where absolutely necessary.

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This specification describes the Java platform virtual machine as implemented by the HotSpot compiler and the runtime system. It covers a number of important aspects of the Java virtual machine and the means by which Java programs execute within it.
The Java platform virtual machine is an abstract machine. It is not tied to any particular computer architecture and can be implemented in a variety of ways for a variety of computers. The Java virtual machine is intended to run only programs written in the Java programming language. Although it is possible to operate the Java virtual machine on a computer whose native instruction set is not the Java instruction set, the Java programming language is designed from the outset to be executed on computers with native instruction sets.
The Java programming language is characterized by three features:
1. An environment in which programs may be developed and executed.
2. A class-based object-oriented programming language.
3. A flexible, high-level, dynamic language that allows a programmer to develop solutions to new problems in short time in less than the half of the time required by a C or C++ programmer.
The Java programming language has features that are designed for efficiency. However, it is also possible to use the Java programming language to write programs that are less than efficient, just as one could use assembly to write programs that are less than efficient.
The Java virtual machine also supports the execution of programs that were not written in the Java programming language. These other languages can be used, for example, to write programs that use Java’s API and that use language constructs that are not available in the Java programming language.
The Java programming language also provides language features that are not present in most other languages. These features include:
1. A mechanism for creating abstract data types.
2. An environment for manipulating these abstract data types in a polymorphic manner.
3. A mechanism for programmatically creating classes.
4. A mechanism for object-based resource management.
5. A mechanism for providing type security for objects.
The Java virtual machine provides a means by which the Java programming language may be executed. It provides an interface to the Java virtual machine so that the software that runs on a particular operating system may access the Java virtual machine and may execute Java programs.
A Java program may contain only a single Java module. A Java module is a collection of Java classes, interfaces, exception handlers, and variable initializers that are compiled together. The Java compiler ensures that each Java module is compiled such that it can be independently executed. Each Java

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I. Object-Oriented Virtual Machines
Introduction
A virtual machine is an abstraction machine. It provides the foundation for an implementation of a computing system. The Java platform is built on top of the Java virtual machine.
In this document the word object refers to the object architecture of the Java platform. The Java platform provides classes for defining, creating, and manipulating objects. An object contains data and execution code. This implementation of the Java platform will support only the class definitions and the operations which they define and make possible.
II. The Java Virtual Machine
The Java virtual machine is the platform upon which applications that follow the Java programming language are executed. Its purpose is to allow programs written in the Java programming language to be executed on multiple platforms.
The Java virtual machine is a set of abstract machine instructions. The Java virtual machine additionally has support for garbage collection and class loading.
The Java virtual machine is an abstract machine, i.e., the Java virtual machine is not required to be a physical device which is capable of executing the abstract machine instructions set forth in this specification. The Java virtual machine is a software implementation of the abstract machine specified in this document.
III. Features of the Java Virtual Machine
The Java virtual machine includes implementations of the bytecodes defined by this specification, the Java programming language, and the Java virtual machine specification. The Java virtual machine also includes a class loader, a set of built-in references that can be used to refer to the Java virtual machine, and other facilities that are not part of the Java programming language.
IV. A Java Virtual Machine Specification
A. Abstract Machine
The abstract machine (hereafter the A-machine) is the concrete implementation of the abstract machine defined by this specification. The A-machine operates under the control of a thread.
The A-machine operates on the program counter to fetch a bytecode from storage. It interprets the bytecode to produce one or more bytecode sequences as defined by this specification.
The A-machine implements the semantics of the Java programming language as described by this specification. The Java programming language implementation in the Java virtual machine requires the Java virtual machine to conform to the behavior defined by this specification.
The A-machine supports two forms of garbage collection. A Java virtual machine conforming to the garbage collection specification requires support for one of these forms.
The A-machine uses the program counter and register contents, as specified in this specification, to pass control to, and return control from, the bytecode
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What’s New in the Java Virtual Machine Specifications?

CHAPTER 1 – Java Language
Much of the following discussion is an overview of the Java language, mainly to provide background to the Java Virtual Machine, and is not specifically mentioned in the official specification of the Java programming language.
1.1. Overview of Java Language
Java is a programming language designed by Sun Microsystems and developed by Sun Microsystems Inc. The formal specification of the Java programming language is in J. Gosling et al., The Java 2 Platform, Standard Edition, Addison-Wesley, Reading, Mass. 1995. The current version of the specification is known as Java 2 Platform, Standard Edition, release 1.3.
At its most general, a program in Java consists of a series of instructions, each of which must be complete on its own. Although the Java programming language doesn’t specify a precise format for source code, the runtime environment (an interpreter or a compiler) is required to interpret and execute the source code. Source code is supplied to a compiler or interpreter through a text editor. FIG. 1 illustrates a block diagram of a compiler system for the Java programming language.
Java includes the class library, a set of platform-independent software components that can be used as building blocks for applications. The class library contains implementation-independent classes called interfaces. The class library also includes a set of interface definition files (IDLs) that define and document the interfaces. IDLs are language-neutral specification of interface types and use of those interfaces.
The class library includes what is known as the Java Naming and Directory Interface (JNDI). The JNDI is a collection of APIs that define an interface to naming and directory services on a network and on the Internet. JNDI interfaces can be used by Java applications to access network services, such as printers, file servers, databases, and other network resources. JNDI supports development of applications that access resources on the network and on the Internet.
JAVA PROGRAMMING LANGUAGE
The Java programming language is designed to be portable, platform independent, object-oriented, and expandable. The Java programming language is portable in that it can run on a wide range of computers, including those that have been commonly used in the past, as well as more complex computers. The Java programming language is platform independent because it is designed to be executed on a wide range of computers. The Java programming language is object-oriented in that it describes a class of resources and the operations they can perform on each other. The

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