pi.1

早期freebsd实现

.\" Copyright (c) 1980, 1990, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"	@(#)pi.1	8.1 (Berkeley) 6/6/93
.\"
.Dd June 6, 1993
.Dt PI 1
.Os BSD 4
.Sh NAME
.Nm pi
.Nd Pascal interpreter code translator
.Sh SYNOPSIS
.Nm \&pi
.Op Fl blnpstuwz
.Op Fl i Ar name ...
.Ar name.p
.Sh DESCRIPTION
.Nm \&Pi
translates the program in the file
.Ar name.p
leaving interpreter code in the file
.Pa obj
in the current directory.
The interpreter code can be executed using
.Nm \&px .
.Nm \&Pix
performs the functions of
.Nm \&pi
and
.Nm \&px
for `load and go' Pascal.
.Pp
The following flags are interpreted by
.Nm \&pi ;
the associated options can also be controlled in comments within the program
as described in the
.%T "Berkeley Pascal User's Manual" .
.Bl -tag -width indent
.It Fl b
Block buffer the file
.Ar output .
.It Fl i
Enable the listing for
any specified procedures and functions and while processing any specified
.Ic include
files.
.It Fl l
Make a program listing during translation.
.It Fl n
Begin each listed
.Ic include
file on a new page with a banner line.
.It Fl p
Suppress the post-mortem control flow backtrace
if an error occurs;
suppress statement limit counting.
.It Fl s
Accept standard Pascal only;
non-standard constructs cause warning diagnostics.
.It Fl t
Suppress runtime tests of subrange variables and treat
.Ic assert
statements as comments.
.It Fl u
Card image mode;
only the first 72 characters of input lines are used.
.It Fl w
Suppress warning diagnostics.
.It Fl z
Allow execution profiling with
.Nm pxp
by generating statement counters, and arranging for the
creation of the profile data file
.Pa pmon.out
when the resulting object is executed.
.El
.Sh FILES
.Bl -tag -width /usr/lib/pi1.*strings -compact
.It Pa file.p
Input file.
.It Pa file.i
Include file(s).
.It Pa /usr/lib/pi2.*strings
Text of the error messages.
.It Pa /usr/lib/how_pi*
Basic usage explanation.
.It Pa obj
Interpreter code output.
.El
.Sh SEE ALSO
.Xr pix 1 ,
.Xr \&px 1 ,
.Xr pxp 1 ,
.Xr pxref 1
.Rs
.%T "Berkeley Pascal User's Manual"
.Re
.Sh DIAGNOSTICS
For a basic explanation do
.Bd -literal -offset indent
pi
.Ed
.Pp
In the diagnostic output of the translator,
lines containing syntax errors are listed with a flag indicating the
point of error.
Diagnostic messages indicate the action which the recovery mechanism
took in order to be able to continue parsing.
Some diagnostics indicate only that the input is `malformed.'
This occurs if the recovery can find no simple correction to make the input
syntactically valid.
.Pp
Semantic error diagnostics indicate a line in the source text near the
point of error.
Some errors evoke more than one diagnostic to help pinpoint the error;
the follow-up messages begin with an ellipsis `...'.
.Pp
The first character of each error message indicates its class:
.Pp
.Bl -tag -width indent -compact -offset indent
.It Li E
Fatal error; no code will be generated.
.It Li e
Non-fatal error.
.It Li w
Warning \- a potential problem.
.It Li s
Non-standard Pascal construct warning.
.El
.Pp
If a severe error occurs which inhibits further processing,
the translator will give a diagnostic and then
.Sq Dv QUIT .
.Sh BUGS
The keyword
.Ic packed
is recognized but has no effect.
.Pp
For clarity,
semantic errors should be flagged at an appropriate place in the source text,
and multiple instances of the `same' semantic error should be summarized
at the end of a
.Ic procedure
or
.Ic function
rather than evoking many diagnostics.
.Pp
When
.Ic include
files are present,
diagnostics relating to the last procedure in one file may appear after the
beginning of the listing of the next.
.\" .Sh ENVIRONMENT
.Sh HISTORY
The
.Nm \&Pi
command appeared in
.Bx 3.0 .