Using an interpreter (simulator) adds quite a bit of
execution overhead. A common solution for high-performance JVMs is
to use dynamic translation or just-in-time (JIT) compilers. In that
case, the runtime system will notice a method has been called
enough times to make it worthwhile to generate machine code for
that method on the fl
Compiling Programs from Source - LinuxQuestions.org - 0 views
Compiling Java with GCJ - 0 views
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y. Future calls to the method will execute the machine code directly.
The Free Software Definition - GNU Project - Free Software Foundation (FSF) - 0 views
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Freedom 1 includes the freedom to use your changed version in place of the original. If the program is delivered in a product designed to run someone else's modified versions but refuse to run yours — a practice known as “tivoization” or (through blacklisting) as “secure boot” — freedom 1 becomes a theoretical fiction rather than a practical freedom. This is not sufficient. In other words, these binaries are not free software even if the source code they are compiled from is free.
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In order for these freedoms to be real, they must be permanent and irrevocable as long as you do nothing wrong; if the developer of the software has the power to revoke the license, or retroactively change its terms, without your doing anything wrong to give cause, the software is not free.
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For example, copyleft (very simply stated) is the rule that when redistributing the program, you cannot add restrictions to deny other people the central freedoms. This rule does not conflict with the central freedoms; rather it protects them.
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