icon - interpret or compile Icon programs
icont [ option ... ] file ... [ -x arg ... ]
iconc [ option ... ] file ... [ -x arg ... ]
icont and iconc each convert an Icon source program into executable
form. icont translates quickly and provides interpretive execution.
iconc takes longer to compile but produces programs that execute
faster. icont and iconc for the most part can be used interchangeably.
This manual page describes both icont and iconc. Where there there are
differences in usage between icont and iconc, these are noted.
File Names: Files whose names end in .icn are assumed to be Icon source
files. The .icn suffix may be omitted; if it is not present, it is
supplied. The character - can be used to indicate an Icon source file
given in standard input. Several source files can be given on the same
command line; if so, they are combined to produce a single program.
The name of the executable file is the base name of the first input
file, formed by deleting the suffix, if present. stdin is used for
source programs given in standard input.
Processing: As noted in the synopsis above, icont and iconc accept
options followed by file names, optionally followed by -x and
arguments. If -x is given, the program is executed automatically and
any following arguments are passed to it.
icont: The processing performed by icont consists of two phases:
translation and linking. During translation, each Icon source file is
translated into an intermediate language called ucode. Two ucode files
are produced for each source file, with base names from the source file
and suffixes .u1 and .u2. During linking, the one or more pairs of
ucode files are combined to produce a single icode file. The ucode
files are deleted after the icode file is created.
Processing by icont can be terminated after translation by the -c
option. In this case, the ucode files are not deleted. The names of
.u1 files from previous translations can be given on the icont command
line. These files and the corresponding .u2 files are included in the
linking phase after the translation of any source files. The suffix .u
can be used in place of .u1; in this case the 1 is supplied
automatically. Ucode files that are explicitly named are not deleted.
iconc: The processing performed by iconc consists of two phases: code
generation and compilation and linking. The code generation phase
produces C code, consisting of a .c and a .h file, with the base name
of the first source file. These files are then compiled and linked to
produce an executable binary file. The C files normally are deleted
after compilation and linking.
Processing by iconc can be terminated after code generation by the -c
option. In this case, the C files are not deleted.
The following options are recognized by icont and iconc:
-c Stop after producing intermediate files and do not delete them.
Redirect standard error output to file.
Enable full string invocation.
Name the output file name.
-s Suppress informative messages. Normally, both informative messages
and error messages are sent to standard error output.
-t Arrange for &trace to have an initial value of -1 when the program
is executed and for iconc enable debugging features.
-u Issue warning messages for undeclared identifiers in the program.
Set verbosity level of informative messages to i
-E Direct the results of preprocessing to standard output and inhibit
The following additional options are recognized by iconc:
Enable features as indicated by the letters in string:
a all, equivalent to delns
d enable debugging features: display(), name(), variable(), error
trace back, and the effect of -f n (see below)
e enable error conversion
l enable large-integer arithmetic
n produce code that keeps track of line numbers and file names in
the source code
s enable full string invocation
Disable specific optimizations. These are indicated by the letters
a all, equivalent to cest
c control flow optimizations other than switch statement
e expand operations in-line when reasonable (keywords are always
s optimize switch statements associated with operation
t type inference
Pass arg on to the C compiler used by iconc
Use the run-time system at path, which must end with a slash.
Have iconc use the C compiler given by prg
When an Icon program is executed, several environment variables
are examined to determine certain execution parameters. Values
in parentheses are the default values.
The initial size of the allocated block region, in bytes.
The size, in words, of each co-expression block.
The location of data bases for iconc to search before the
standard one. The value of DBLIST should be a blank-
separated string of the form p1 p2 ... pn where the pi name
If set, a core dump is produced for error termination.
The location of iconx, the executor for icode files, is
built into an icode file when it is produced. This location
can be overridden by setting the environment variable ICONX.
If ICONX is set, its value is used in place of the location
built into the icode file.
The location of ucode files specified in link declarations
for icont. IPATH is a blank-separated list of directories.
The current directory is always searched first, regardless
of the value of IPATH.
The location of source files specified in preprocessor
$include directives and in link declarations for iconc.
LPATH is otherwise similar to IPATH.
The size, in words, of the main interpreter stack for icont.
By default, &errout is buffered. If this variable is set,
&errout is not buffered.
The size, in bytes, of the region used for pointers to
strings during garbage collection.
The initial size of the string space, in bytes.
The initial value of &trace. If this variable has a value,
it overrides the translation-time -t option.
icont Icon translator
iconc Icon compiler
iconx Icon executor
The Icon Programming Language, Ralph E. Griswold and Madge T.
Griswold, Prentice-Hall Inc., Englewood Cliffs, New Jersey,
Second Edition, 1990.
Version 9.1 of Icon, Ralph E. Griswold, Clinton L. Jeffery, and
Gregg M. Townsend, IPD267, Department of Computer Science, The
University of Arizona, 1995.
Version 9 of the Icon Compiler, Ralph E. Griswold, IPD237,
Department of Computer Science, The University of Arizona, 1995.
LIMITATIONS AND BUGS
The icode files for the interpreter do not stand alone; the Icon
run-time system (iconx) must be present.
Stack overflow is checked using a heuristic that is not always
1 November 1995 IPD244b ICON(1)