166 lines
5.3 KiB
Text
166 lines
5.3 KiB
Text
.sp 1.5i
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.NH
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Compiler options
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.nh
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.PP
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There are some options available to control the behaviour of the compiler.
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Two types of options can be distinguished: compile-time options and
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run-time options.
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.sp
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.NH 2
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Compile time options
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.LP
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.sp
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There are some options that can be set when the compiler is installed.
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Those options can be found in the file \fIParameters\fR. To set a parameter
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just modify its definition in the file \fIParameters\fR. The shell script
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in the file \fImake.hfiles\fR creates for each parameter a separate .h file.
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This mechanism is derived from the C compiler in ACK.
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.sp
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\fBIDFSIZE\fR
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.in +3m
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The maximum number of characters that are significant in an identifier. This
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value has to be at least the value of \fBMINIDFSIZE\fR, defined in the file
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\fIoptions.c\fR. A compile-time check is included to see if the value of
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\fBMINIDFSIZE\fR is legal. The compiler will not recognize some keywords
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if \fBIDFSIZE\fR is too small.
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.in -3m
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.sp
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\fBISTRSIZE\fR, \fBRSTRSIZE\fR
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.in +3m
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The lexical analyzer uses these two values for the allocation of memory needed
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to store a string. \fBISTRSIZE\fR is the initial number of bytes allocated.
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\fBRSTRSIZE\fR is the step size used for enlarging the memory needed.
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.in -3m
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.sp
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\fBNUMSIZE\fR
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.in +3m
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The maximum length of a numeric constant recognized by the lexical analyzer.
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It is an error if this length is exceeded.
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.in -3m
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.sp
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\fBERROUT\fR, \fBMAXERR_LINE\fR
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.in +3m
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Used for error messages. \fBERROUT\fR defines the file on which the
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messages are written. \fBMAXERR_LINE\fR is the maximum number of error
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messages given per line.
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.in -3m
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.sp
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\fBSZ_CHAR\fR, \fBAL_CHAR\fR, etc
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.in +3m
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The default values of the target machine sizes and alignments. The values
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can be overruled with the \-V option.
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.in -3m
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.sp
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\fBMAXSIZE\fR
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.in +3m
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This value must be set to the maximum of the values of the target machine
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sizes. This parameter is used in overflow detection (see also section 3.2).
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.in -3m
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.sp
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\fBDENSITY\fR
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.in +3m
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This parameter is used to decide what EM instruction has to be generated
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for a case-statement. If the range of the index value is sparse, i.e.
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.br
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.ti +5m
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(upperbound - lowerbound) / number_of_cases
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.br
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is more than some threshold (\fBDENSITY\fR) the \fBcsb\fR instruction is
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chosen. If the range is dense a jump table is generated (\fBcsa\fR). This
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uses more space. Reasonable values are 2, 3 or 4.
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.br
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Higher values might also be reasonable on machines, which have lots of
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address space and memory (see also section 3.3.3).
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.in -3m
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.sp
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\fBINP_READ_IN_ONE\fR
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.in +3m
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Used by the generic input module. It can either be defined or not defined.
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Defining it has the effect that files will be read completely into memory
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using only one read-system call. This should be used only on machines with
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lots of memory.
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.in -3m
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.sp
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.bp
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\fBDEBUG\fR
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.in +3m
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.nf
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If this parameter is defined some built-in compiler-debugging tools can be used:
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.in +2m
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\(bu only lexical analyzing is done, if the \-l option is given.
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\(bu if the \-I option is turned on, the allocated number of structures is printed.
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\(bu the routine debug can be used to print miscellaneous information.
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\(bu the routine PrNode prints a tree of nodes.
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\(bu the routine DumpType prints information about a type structure.
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\(bu the macro DO_DEBUG(x,y) defined as ((x) && (y)) can be used to perform
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several actions.
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.in -2m
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.in -3m
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.sp
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.NH 2
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Run time options
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.LP
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.sp
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The run time options can be given in the command line when the compiler is
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called.
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.br
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They all have the form: \-<character>
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.br
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Depending on the option, a character string has to be specified. The following
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options are currently available:
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.sp
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.IP \-\fBC\fR 18
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The lower case and upper case letters are treated different (\fBISO 6.1.1\fR).
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.sp
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.IP \-\fBu\fR
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The character '_' is treated like a letter, so it is allowed to use the
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underscore in identifiers.
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.br
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Note: identifiers starting with an underscore may cause problems, because
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.br
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\h'\w'Note: 'u'most identifiers in library routines start with an underscore.
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.sp
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.IP \-\fBn\fR
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This option suppresses the generation of register messages.
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.sp
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.IP \-\fBr\fR
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With this option rangechecks are generated where necessary.
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.sp
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.IP \-\fBL\fR
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Do not generate EM \fBlin\fR and \fBfil\fR instructions. These instructions
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are used only for profiling.
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.sp
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.IP \-\fBM\fR<number>
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Set the number of characters that are significant in an identifier to <number>.
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The maximum significant identifier length depends on the constant IDFSIZE,
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defined in \fIidfsize.h\fR.
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.sp
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.IP \-\fBi\fR<number>
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With this flag the setsize for a set of integers can be changed. The number must
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be the number of bits per set. Default value : (#bits in a word) \- 1
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.sp
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.IP \-\fBw\fR
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Suppress warning messages (see also section 2.5).
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.sp
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.IP \-\fBV\fR[[\fBw\fR|\fBi\fR|\fBf\fR|\fBp\fR|\fBS\fR][\fIsize\fR]?[\fI.alignment\fR]?]*
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.br
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Option to set the object sizes and alignments on the target machine
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dynamically. The objects that can be manipulated are:
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.br
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\fBw\fR\h'\w'ifpS'u' word
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.br
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\fBi\fR\h'\w'wfpS'u' integer
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.br
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\fBf\fR\h'\w'wipS'u' float
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.br
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\fBp\fR\h'\w'wifS'u' pointer
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.br
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\fBS\fR\h'\w'wifp'u' structure
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.br
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In case of a structure, \fIsize\fR is discarded and the \fIalignment\fR is
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the initial alignment of the structure. The effective alignment is the least
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common multiple of \fIalignment\fR and the alignment of its members. This
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option has been implemented so that the compiler can be used as cross
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compiler.
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.bp
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