The Java Virtual Machine is the software implementation of a "CPU" designed to run compiled Java code. Using the Java Virtual Machine (JVM) makes it possible to develop additional syntaxes for expressing the problems you want to solve and gives more control over the performance of your application. This text is a comprehensive programming guide for the Java Virtual Machine. Providing an overview and reference of the JVM, it enbles users to create their own implementations of the JVM or write their own compilers that create Java object code. The book is divided into two sections: the first includes information on the semantics and structure of the JVM; the second is a reference of the JVM instructions, or "opcodes." The programming guide includes numerous examples written in Java assembly language. A Java assembler is provided with the book, so the examples can all be compiled and executed. The reference section offers a complete description of the instruction set of the VM, and the class file format including a description of the byte-code verifier.

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Check out the web site for Jasmin, the Java assembler written by one of the authors: http://www.cat.nyu.edu/meyer/jasmin/

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4 of 5 people found the following review helpful:

3.0 out of 5 stars necessary but frustrating, 2 Jul 1998

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I know of only one book that covers the JVM and the binary codes, the classfile format etc. It is known as the goldfish bowl book because of its cover, but is officially called The Java Virtual Machine. The book is frustrating because it spends so much time with the irrelevant Jasmin assembler and its syntax. You are interested in generating byte codes directly, not assembler. It leaves out much you must discover by experiment looking at generated class files, such as whether offsets are signed or absolute, where the base is etc. In its next revision, it should set the Jasmin aside in an appendix, and include examples and more precise documentation on the binary formats. The book is still valuable because it gives a fair bit of background exposition you will not find in the vmspec itself. You would use this book to understand the VM, then the vmspec to actually write code that generated or modified class files.

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