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+.\" $Header$
+.TH EM I
+.ad
+.SH NAME
+em \- calling program for em interpreters
+.SH SYNOPSIS
+em [-t] [+fcp] [loadfile [args ... ...] ]
+.SH DESCRIPTION
+The loadfile ("e.out" if not specified) is opened to read the first 8 word header.
+The format of this header is explained in e.out(V).
+One of these 8 words is a flag word
+specifying the interpreter options requested at compile time.
+The usual setting of these options is +t +l -f -c -p.
+One of these options may be overridden at run time
+by the corresponding flag of em.
+Based on these options the name of the appropriate interpreter
+is constructed.
+Two versions exist, one for two byte words and four byte pointers and
+one for four byte words and pointers.
+.PP
+This interpreter is first searched for in /usr/em/mach/m68k[2,4]/int, then in the current
+directory.
+.PP
+The flags control the following options that can be turned off
+or on by prepending them with - or + respectively:
+.IP t
+run time tests for undefined variables, array bounds etc...
+This option costs a small amount of memory and some time.
+However, it is very useful for debugging.
+.IP p
+profiling of the entire program. The interpreter maintains tables containing
+an estimate of the number of processor state cycles used per source line.
+A processor state cycle is equal to two internal clock cycles.
+This option is expensive in time as well as in memory space.
+The result tables made at run time are dumped in a human readable
+format onto a file named
+em_profile.
+.IP f
+maintain a bit map of all source lines that have been executed.
+This map is written onto a file em_flow .
+This option is almost free in time and space.
+The file is not easy to read .
+Of each procedure only the lines between the first statement and the last
+statement are represented in the bit map.
+.IP c
+count line usage in tables that
+contains for every source line the number of times it
+was entered.
+These tables are written onto em_count.
+This option is cheap in time ,but costs some in memory space.
+.IP l
+dump the line numbers of the last 64 lines entered onto a file named
+em_last.
+This file will be in a human readable format.
+.PP
+These flags
+give rise to 5 different interpreters which are in the
+directory /usr/em/mach/m68k2/int or in /usr/em/mach/m68k4/int
+for the two byte word or the four byte word options , respectively.
+.PP
+.SH "FILES"
+.IP /usr/em/mach/m68k[2,4]/int/em_???? 35
+interpreters proper
+.PD 0
+.IP /usr/em/lib/m68k2_int/mloop?
+source of interpreter
+.IP /usr/em/mach/m68k[2,4]/int/?+
+positive option switch
+.IP /usr/em/mach/m68k[2,4]/int/?-
+negative option switch
+.IP em_profile
+profile data
+.IP em_count
+source line count data
+.IP em_flow
+source line flow data
+.IP em_last
+last lines executed
+.PD
+.SH "SEE ALSO"
+ack(I), int(I)
+.SH BUGS
+Most error messages are self explanatory.
+If runtime flags are turned on it is advisable to try again
+with the default options.
+Of the interpreter does not work most probably your particular
+machine has an other format for the system calls then assumed
+in the source .
+In that case adapt source file mloopc to your machine.
+Also the instruction that causes the machine to allocate stack
+space might differ .
+In that case adapt the macro 'claimstack' in deffile.
+Bugs should be reported to Freek van Schagen.