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Commands Reference, Volume 5
struct Command
Purpose
Translates a FORTRAN program into a RATFOR program.
Syntax
struct [ -s ] [ -i ]
[ -a ] [ -b ] [ -n ]
[ -tNumber ] [ -cNumber ] [ -eNumber ] [ File ]
Description
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.
Flags
-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.
Examples
To translate the test.f
FORTRAN program into the newtest.ratfor RATFOR
program, enter:
struct -s -i -n -t2 test.f > newtest.ratfor
Files
/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. |
Related Information
The asa
or fpr command, fsplit command.
The Commands Overview
in AIX 5L Version 5.2 System Management Guide: Operating System and Devices.
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