LIMBO(1E) LIMBO(1E)
NAME
limbo - Limbo compiler
SYNOPSIS
limbo [ option ... ] [ file ... ]
DESCRIPTION
Limbo compiles the named Limbo files into machine-
independent object files for the Dis virtual machine.
Depending on the options, the compiler may create output
files or write information to its standard output. Conven-
tional files and their extensions include the following.
file.b Limbo source file.
file.dis Object code for the Dis virtual machine.
file.m Limbo source file for module declarations.
file.s Assembly code.
file.sbl Symbolic debugging information.
With no options, limbo produces a .dis file for each source
file.
The compiler options are:
-a Print on standard output type definitions and call
frames useful for writing C language implementa-
tions of Limbo modules. Suppresses normal output
file generation.
-C Mark the Dis object file to prevent run-time com-
pilation.
-c Mark the Dis object file to guarantee run-time
compilation.
-D flags Turn on debugging flags. Flags include A for
arrays, a for alt statements, b for booleans, C
for case body statements, c for case statements, D
for use descriptors, d for declarations, e for
expressions, E for extended expressions, F for
function information, f for constant folding, m
for modules, n for nil references, P for program
counter manipulations, r for reference types, S
for type signatures, s for a code generation sum-
mary, T for tuples, t for type checking, and v for
variable initialization.
Page 1 Plan 9 (printed 12/21/24)
LIMBO(1E) LIMBO(1E)
-e Increase the number of errors the compiler will
report before exiting.
-G Annotate assembly language output with debugging
information. A no-op unless -S is set.
-g Generate debugging information for the input files
and place it in a file named by stripping any
trailing .b from the input file name and appending
.sbl.
-i Disable inlining of functions. Currently functions
containing a single return statement or two return
statements and an if clause are candidates for
inlining.
-I dir An include file whose name does not begin with
slash is sought first relative to the working
directory, regardless of the source file argument.
If this fails, limbo sequences through directories
named in -I options, then searches in /module. An
include file contains Limbo source code, normally
holding one or more module declarations.
-o obj Place output in file obj (allowed only if there is
a single input file). The output file will hold
either object or assembly code, depending on -S.
Default is to take the last element of the input
file name, strip any trailing .b, and append .dis
for object code and .s for assembly code. Thus,
the default output file for dir/mod.b would be
mod.dis.
-S Create assembly language output instead of object
code.
-T module Print on standard output C stub functions, useful
for implementing Limbo modules in the C language
for linkage with the interpreter.
-t module Print on standard output a table of runtime func-
tions, to link C language implementations of mod-
ules with the Limbo interpreter. Suppresses nor-
mal output file generation.
-w Print warning messages about unused variables,
etc. More w's (e.g., -ww) increase the pedantry
of the checking.
FILES
/module directory for Limbo include modules
Page 2 Plan 9 (printed 12/21/24)
LIMBO(1E) LIMBO(1E)
SOURCE
/appl/limbo compiler source in Limbo
/limbo compiler source in C for host
SEE ALSO
asm(1), emu(1), mk(10.1), intro(2), sys-intro(2), tk(2)
``The Limbo Programming Language''
``Program Development in Inferno''
``A Descent into Limbo''
in Volume 2.
Page 3 Plan 9 (printed 12/21/24)