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FORVER is a program that takes as input a FORTRAN-10 source file and
analyses it to determine whether subroutine and function calls are
correct, both in the type of the passed arguments, and in their number.
This being one of the most common errors encountered in FORTRAN
programs, and the fact that the DEC-10 FORTRAN compiler doesn't do
anything about it are the main task in life for FORVER.
HOW TO RUN FORVER
To run FORVER on the DEC-10, just give the monitor command:
You will then get a message of some sort telling you the FORVER version
you're dealing with, and a prompt:
To this you must give it the name of a FORTRAN source file, and whatever
options you want, in the format:
Following is a description of the various options and their meanings.
DESCRIPTION OF THE FORVER COMMAND LINE
If you just say "FOOBAR<return>" after the "FVR>" prompt, forver will
assume the following:
1. Your FORTRAN source file is FOOBAR.FOR in your PPN (actually
you can give a full DEC-10 filespec like DEV:NAME.EXT[P,PN],
the defaults being DSK:.FOR[yourppn].
2. FORVER will generate a listing file FOOBAR.LSV containing a
numbered listing of your source file (optionally) as well as
a second section containing a list of all SUBROUTINES and
FUNCTIONS encountered in your source file . In this part all
the incorrect calls will be listed showing the argument types
so you can decide what to do with them.
3. Optionally, FORVER will also generate an "attibute" file
called FOOBAR.VTR containing a compact (and readable)
not only the defined routines, but also the referenced ones, although
these may not be part of this source
description of all the entry-points defined in this source
file. This is necessary for, say, subroutine packages like
IMSL or NEWPLT, that are to be called from other files.
LIST OF FORVER SWITCHES
Following is a list of all valid FORVER switches (all switches may be
abbreviated to one letter). Note also that most switches (except /FULL)
act as toggles, meaning that if you give one of them twice it's as if
you hadn't given it at all.
/VTR Generate .VTR attribute file. When this switch in on,
the .VTR file corresponding to this source will be
/UNDECLARED Warn the user about undeclared variables, and report
their assumed types in the listing file.
/INIT Warn the user about uninitialized variables. This is
used to tell you about variables whose value is used
(eg. in an expression) before FORVER has seen something
explicitly assigned to them (notice that a warning of
this kind is not always correct since control flow in
FORTRAN programs is seldom sequential and variables may
be initialized in other ways, not visible to FORVER, eg.
in a routine call).
/ASSIGNMENT Check that all assignments are done with implicit type
conversion (eg. this will point out statements like
I = 1.5).
/DIVISIONS Warn the user about integer divisions. This is also a
common source of hard to locate errors; this may happen
for instance, in a stapement like HALF = 1/2, where the
REAL variable "HALF" will get the value 0.0 instead of
0.5 as was probably the user's intent.
/LIST Generate the line-numbered listing of the source file.
This option is provided so that you don't have to get
the full listing in those cases where all you want is to
have a quick look at the incorrect routine calls.
/FULL Do everything. This switch turns all the other switches
The default switch settings is only "/VTR".
When the source file has been completely scanned, and if there are some
routines that remain undefined, FORVER will prompt you with a message:
[FVRUDS "n" undefined external references]
To this prompt you must give the filespec corresponding to the .VTR file
you think will be needed. FORVER will then tell you what it found in
that file, and continue prompting you until all references are
satisfied, or you type <return> to the "Search:" prompt, in which case
FORVER won't be able to verify the calls to the undefined routines.
To this you may also answer "?<return>" and FORVER will list all the
remaining undefined references, to guide you in your decision as to what
.VTR files you will search.
Frequently used FORTRAN subroutine packages such as IMSL or NEWPLT have
their .VTR files in device FOR:, to get the complete list of available
.VTR files, type the monitor command: