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| + | The pages grouped under this category provide information about Virtual Machines used in academic or professional environments as the target of some compilers. | ||
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| + | A Virtual Machine (VM) is a program that simulates the behavior of a real CPU. | ||
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| + | The program uses data structures to implement the blocks that compose the machine architecture like the ''decoder'', | ||
| + | the ''controller'', the ''registers'', the ''stack'', the ''data'' and ''program memories'', the ''input/output ports'', etc. | ||
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| + | It accepts as input a ''list of instructions'' (the machine code), written in the style of an Assembly language (operator followed by zero or | ||
| + | more operands), and interprets (recognizes and | ||
| + | executes) them sequentially from the first to the last or until finding one that halts the execution. | ||
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| + | In this way, the VM simulates the execution of the program (defined by that list of instructions) on a real CPU. | ||
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| + | The biggest advantage of using a VM as the target of a Compiler is the possibility to run a program independently of the hardware. | ||
| + | The most famous example is JVM, Java Virtual Machine, used by the Java Compiler -- in this way the same java byte-code can be executed in any hardware platform where a JVM is installed. | ||
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| + | _________________________________________________________ | ||
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| + | Click [{{fullurl:{{FULLPAGENAMEE}}|action=pdfbook}} here] to download this selection of articles as a PDF book. | ||
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| + | _________________________________________________________ | ||
