CLP Decompiler Product Description
computer program stores the same information in two different
computer languages. The first is called the source language
and consists of English-like instructions which can be understood
by humans. If a programmer wishes to change the task which
a program is to perform s/he changes the instructions contained
in the source. However, these instructions cannot be understood
by the computer. The computer can only process instructions
written in machine language. In order to run the program,
the source instructions must be run through a language translator
called a compiler. The compiler creates a new version of the
program, one written in machine language. In other words,
the compiler translates programs written in a language understandable
by humans into a language understood by the computer.
As long as the machine language version of the program exists
on the computer system, the program can be run, and as long
as the source language version exists on the system, the program
can be modified, enhanced or debugged by the programmer. If
the machine language version is accidentally destroyed, the
source can be run through the compiler again, and a new machine
instruction version is generated. But, if the source is accidentally
destroyed, it can only be reached by the use of a decompiler,
a programmer's tool which reverses the process of the original
AS/400 ENVIRONMENT: The JGS utility will run on all models
of the AS/400 system. Version 3 Release 1 or above of OS/400
JGS CLP generates new CLP source members from compiled CLP
program objects which have been compiled using the ALWRTVSRC
(*NO) option. The new source members are Functionally Equivalent
to the original source members.
Current benchmarks put the time required to decompile a program
at approximately three times (3x) longer than the time required
to compile the source member. That is, a member which would
take 2 minutes to compile would take 6 minutes to decompile.
user programmer productivity in several problem solving areas:
which of several source members corresponds to currently
running object programs.
modifications in current object
missing from current source.
Best Price/Performance for
Recreating Existing Code.
Migration to New Platforms.
Investment in Existing Software for
Which Source is Not Available.
copy of JGS CLP is tied to a particular CPU via the systems
unique serial number to prevent unauthorized duplication of
the software. In order to decompile a program object, the
user must have *ALLOBJ authority over the object to be restored
and *CHANGE authority to the source physical file where the
new member is to reside.
CLP currently supports decompilation of CLP program objects
compiled under CPF rel 8 through OS/400 V5R2.