42 lines
1.7 KiB
Text
42 lines
1.7 KiB
Text
# $Id$
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This directory contains the sources of the EM interpreter. A parallel
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directory contains the manual page and the documentation. Two types of
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interpreters can be generated.
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- Normal Version
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A call to make will result in the generation of an interpreter, int. This
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interpreter will do full checking and can do logging on request. It is the
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normal interpreter to be used for software checking and grooming.
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- Fast Version
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If the interpreter is used for the purpose of running programs rather than for
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testing them, a considerably faster version can be generated by undefining the
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macro LOGGING in the include file logging.h . This interpreter will
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still give some warnings: about bad trap numbers, unimplemented system calls
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and the occurrence of traps.
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There are a small number of compile-time flags, each in a separate file:
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loggin.h - distinguishes between normal and fast version
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debug.h - ignore
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segcheck.h - ignore
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sysidf.h - define the approrpiate system name
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v7ioctl.h - define if ioctl requests should conform to UNIX V7
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nofloat.h - define if the C compiler used has no floating point
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There are two subdirectories:
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switch - generates opcode-analysing switches
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test - contains testprograms
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Installation note:
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The file do_fpar.c (do floating point arithmetic) contains a macro MAXDOUBLE
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which defines the largest possible double on the present machine. It is set to
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99.e999, which may not be acceptable to your compiler. Adjust as necessary.
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Note:
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This interpreter assumes that the char in the C compiler used to translate
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the interpreter, is a signed char. It is not impossible to adapt the
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interpreter to unsigned chars, but it is not trivial.
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