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Java bytecode is the instruction set of the Java virtual machine (JVM), the language to which Java and other JVM-compatible source code is compiled. [1] Each instruction is represented by a single byte , hence the name bytecode , making it a compact form of data .
load a reference onto the stack from a local variable #index: aload_0 2a 0010 1010 → objectref load a reference onto the stack from local variable 0 aload_1 2b 0010 1011 → objectref load a reference onto the stack from local variable 1 aload_2 2c 0010 1100 → objectref load a reference onto the stack from local variable 2 aload_3 2d 0010 1101
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]
Concurnas, an open source JVM language designed for building reliable, scalable, high performance concurrent, distributed and parallel systems. Ceylon , a Java competitor from Red Hat [ 3 ] CFML , ColdFusion Markup Language, more commonly known as CFML, is a scripting language for web development that runs on the JVM, the .NET framework, and ...
Code, constants, and other class data are stored in the "method area". The method area is logically part of the heap, but implementations may treat the method area separately from the heap, and for example might not garbage collect it. Each JVM thread also has its own call stack (called a "Java Virtual Machine stack" for clarity), which stores ...
Following their promise to release a Java Development Kit (JDK) based almost completely on free and open-source code in the first half of 2007, [11] Sun released the complete source code of the Java Class Library under the GPL on May 8, 2007, except for some limited parts that had been licensed to Sun by third parties and Sun was unable to re-license under the GPL. [12]
A "good" IR must be accurate – capable of representing the source code without loss of information [2] – and independent of any particular source or target language. [1] An IR may take one of several forms: an in-memory data structure, or a special tuple- or stack-based code readable by the program. [3]
Typical Java interpreters do not buffer the top-of-stack this way, however, because the program and stack have a mix of short and wide data values. If the hardwired stack machine has 2 or more top-stack registers, or a register file, then all memory access is avoided in this example and there is only 1 data cache cycle.