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Commands Reference, Volume 5
Translates a FORTRAN program into
a RATFOR program.
struct [ -s ] [ -i ] [ -a ] [
-b ] [ -n
] [ -tNumber ] [ -cNumber ] [ -eNumber ] [ File ]
The struct command
translates the FORTRAN program specified by File (standard input
default) into a RATFOR program. Wherever possible, RATFOR control
constructs replace the original FORTRAN. Statement numbers appear only
where still necessary. Cosmetic changes are made, including changing
Hollerith strings into quoted strings and relational operators into symbols
(for example, .GT. into >). The
output is appropriately indented.
The struct command
knows FORTRAN 66 syntax, but not full FORTRAN 77. If an input FORTRAN
program contains identifiers that are reserved words in RATFOR, the structured
version of the program will not be a valid RATFOR program. The labels
generated cannot go above 32767. If you get a goto statement
without a target, try using the -e flag.
| -a
| Turn sequences of else-if statements into a non-RATFOR switch
of the form:
switch
{ case pred1: code
case pred2: code
case pred3: code
default: code
}
The case predicates
are tested in order. The code appropriate to only one case is
executed. This generalized form of switch statement does not
occur in RATFOR.
|
| -b
| Generates goto statements instead of multilevel
break statements.
|
| -c Number
| Increments successive labels in the output program by the nonzero
integer Number. The default is 1. Do not insert a
space between -c and Number.
|
| -e Number
| If Number is 0 (default), places code within a loop only if it
can lead to an iteration of the loop. Do not insert a space between
-e and Number.
|
| -i
| Do not turn computed goto statements into switches.
(RATFOR does not turn switches back into computed goto
statements.)
|
| -n
| Generates goto statements instead of multilevel
next statements.
|
| -s
| Input is accepted in standard format. Comments are specified by a
c, C, or * in column 1, and continuation
lines are specified by a nonzero, nonblank character in column 6. Input
is in the form accepted by the f77 command.
|
| -t Number
| Makes the nonzero integer Number the lowest valued label in
the output program. The default is 10. Do not insert a space
between -t and Number.
|
If Number is nonzero,
admits small code segments to a loop if otherwise the loop would have exits to
several places including the segment, and the segment can be reached only from
the loop. In this case, small is close to, but not equal to, the number
of statements in the code segment. Values of Number under 10
are suggested.
To translate the
test.f FORTRAN program into the
newtest.ratfor RATFOR program, enter:
struct -s -i -n -t2 test.f > newtest.ratfor
| /tmp/struct*
| Temporary files used during processing of the struct
command.
|
| /usr/lib/struct/structure
| File that handles processing for the struct command.
|
| /usr/lib/struct/beautify
| File that handles processing for the struct command.
|
| /usr/ucb/struct
| Contains the struct command.
|
The asa or fpr command, fsplit command.
The Commands
Overview in AIX 5L Version 5.1 System Management Guide:
Operating System and Devices.
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