Java bytecode: Difference between revisions

Revision as of 22:56, 6 June 2008

Revision as of 02:22, 8 June 2008

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'''Java bytecode''' is the form of instructions that the [[Java virtual machine]] executes. Each [[bytecode]] instruction or opcode is one byte in length, however not all of the possible 256 instructions are used. In fact, [[Sun Microsystems]], the original creators of the [[Java (programming language)|Java programming language]], the [[Java virtual machine]] and other components of the Java Runtime Environment, have set aside a number of values to be permanently unimplemented.{{cnFact|date=June 2008}}

== Relation to Java ==

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Some projects provide Java assemblers to enable writing Java bytecode by hand. Assembler code may be also generated by machine, for example by compiler targeting [[Java virtual machine]]. Notable Java assemblers include:

* [[Jasmin (Java_assemblerJava assembler)|Jasmin]], takes textual descriptions for Java classes, written in a simple assembler-like syntax using Java Virtual Machine instruction set and generates a Java class file <ref>[http://jasmin.sourceforge.net Jasmin Home Page<!-- Bot generated title -->]</ref>

* [[Jamaica (Java assembler)|Jamaica]], a [[Macro (computer science)|macro]] [[assembly language]] for the [[Java virtual machine]]. Java syntax is used for class or interface definition. Method bodies are specified using bytecode instructions. <ref>[http://www.judoscript.com/articles/jamaica.html Jamaica: The Java Virtual Machine (JVM) Macro Assembler<!-- Bot generated title -->]</ref>