#WHAT DOES TERM COMPILING JAVA MEAN PORTABLE#
This eliminated the object code and executables, and allowed these languages to be portable to multiple operating systems and hardware platforms. In the beginning, a compiler was responsible for turning a high-level language (defined as higher level than assembler) into object code (machine instructions), which would then be linked (by a linker) into an executable.Īt one point in the evolution of languages, compilers would compile a high-level language into pseudo-code, which would then be interpreted (by an interpreter) to run your program. Some examples of JIT Compilers are JVM (Java Virtual Machine) in Java and CLR (Common Language Runtime), in C#. Meaning, that the resulting machine code is optimized for the running machine’s CPU architecture. What is important to understand about the JIT compilation, is that it will compile the bytecode into machine code instructions of the running machine.
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The advantages of a JIT are due to the fact, that since the compilation takes place in run time, a JIT compiler has access to dynamic runtime information enabling it to make better optimizations (such as inlining functions). What happens is the translation to machine code. Meaning, at run time, as opposed to prior to execution. Just In Time Compilation, JIT, or Dynamic Translation, is compilation that is being done during the execution of a program. Depending on the compiler, this can be done on a method or smaller section of code.ĭynamic compilation was first described in a paper by J. While the interpreted program is being run, the JIT compiler determines the most frequently used code and compiles it to machine code. JIT compilation attempts to use the benefits of both. An interpreter directly executes the source code.
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Static compilation converts the code into a language for a specific platform. Traditionally there are two methods for converting source code into a form that can be run on a platform. To limit the overhead, many JIT compilers only compile the code paths that are frequently used. Some of the disadvantages include startup delays and the overhead of compilation during runtime. If the behavior of the application changes while it is running, the runtime environment can recompile the code. This allows for more optimized code to be generated. When running Java or C# applications, the runtime environment can profile the application while it is being run.
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It is also known as dynamic compilation.ĭynamic compilation has some advantages over static compilation. During execution the program may be compiled into native code to improve its performance. Just-in-time compilation is a method for improving the performance of interpreted programs.