79 lines
2.9 KiB
Groff
79 lines
2.9 KiB
Groff
.TH EM_CEMCOM 6ACK
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.ad
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.SH NAME
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em_cemcom \- C to EM compiler
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.SH SYNOPSIS
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\fB~/em/lib/em_cemcom\fP [\fIoptions\fP] \fIsource \fP[\fIdestination \fP[\fInamelist\fP]]
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.SH DESCRIPTION
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\fICemcom\fP is a compiler that translates C programs
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into EM compact code.
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The input is taken from \fIsource\fP, while the
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EM code is written on \fIdestination\fP.
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If either of these two names is "\fB-\fP", standard input or output respectively
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is taken.
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The file \fInamelist\fP, if supplied, will contain a list of the names
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of external, so-called \fBcommon\fP, variables.
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When the preprocessor is invoked to run stand-alone, \fIdestination\fP
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needs not be specified.
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.br
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\fIOptions\fP is a, possibly empty, sequence of the following combinations:
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.IP \fB\-D\fIname\fR=\fItext\fR
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.br
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define \fIname\fR as a macro with \fItext\fR as its replacement text.
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.IP \fB\-D\fIname\fR
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.br
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the same as \fB\-D\fIname\fR=1.
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.IP \fB\-I\fIdirname\fR
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.br
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insert \fIdirname\fR in the list of include directories.
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.IP \fB\-M\fP\fIn\fP
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set maximum identifier length to \fIn\fP.
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.IP \fB\-n\fR
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do not generate EM register messages.
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The user-declared variables are not stored into registers on the target
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machine.
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.IP \fB\-L\fR
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don't generate the EM \fBfil\fR and \fBlin\fR instructions
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that usually are generated to enable
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an interpreter to keep track of the current location in the source code.
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.IP \fB\-p\fR
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generate code at each procedure entry to call the routine
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.BR procentry ,
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and at each return to call the routine
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.BE procexit .
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These routines are supplied with one parameter, a pointer to a
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string containing the name of the procedure.
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.IP \fB\-R\fR
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interpret the input as restricted C (according to the language as
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described in \fIThe C programming language\fR by Kernighan and Ritchie.)
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.IP \fB\-U\fIname\fR
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.br
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get rid of the compiler-predefined macro \fIname\fR.
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.IP \fB\-V\fIcm\fR.\fIn\fR,\ \fB\-V\fIcm\fR.\fIncm\fR.\fIn\fR\ ...
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.br
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set the size and alignment requirements.
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The letter \fIc\fR indicates the simple type, which is one of
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\fBs\fR(short), \fBi\fR(int), \fBl\fR(long), \fBf\fR(float), \fBd\fR(double) or
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\fBp\fR(pointer).
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The \fIm\fR parameter can be used to specify the length of the type (in bytes)
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and the \fIn\fR parameter for the alignment of that type.
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Absence of \fIm\fR or \fIn\fR causes the default value to be retained.
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To specify that the bitfields should be right adjusted instead of the
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default left adjustment, specify \fBr\fR as \fIc\fR parameter.
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.IP \fB\-w\fR
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suppress warning messages
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.IP \fB\-\-\fItext\fR
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.br
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where \fItext\fR can be either of the above or
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a debug flag of the compiler (which is not useful for the common user.)
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This feature can be used in various shell scripts and surrounding programs
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to force a certain option to be handed over to \fBcemcom\fR.
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.LP
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.SH FILES
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.IR ~em/lib/em_cemcom :
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the compiler
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.SH DIAGNOSTICS
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All warning and error messages are written on standard error output.
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.SH REFERENCE
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Baalbergen, E.H., D. Grune, M. Waage ;"\fIThe CEM compiler\fR",
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Informatica Manual IM-4
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