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-------------------------------------------------------------------------------
-- Copyright (c) 2006-2013 Fabien Fleutot and others.
--
-- All rights reserved.
--
-- This program and the accompanying materials are made available
-- under the terms of the Eclipse Public License v1.0 which
-- accompanies this distribution, and is available at
-- http://www.eclipse.org/legal/epl-v10.html
--
-- This program and the accompanying materials are also made available
-- under the terms of the MIT public license which accompanies this
-- distribution, and is available at http://www.lua.org/license.html
--
-- Contributors:
-- Fabien Fleutot - API and implementation
--
-------------------------------------------------------------------------------
-- Survive lack of checks
if not pcall(require, 'checks') then function package.preload.checks() function checks() end end end
-- Main file for the metalua executable
require 'metalua.loader' -- load *.mlue files
require 'metalua.compiler.globals' -- metalua-aware loadstring, dofile etc.
local alt_getopt = require 'alt_getopt'
local pp = require 'metalua.pprint'
local mlc = require 'metalua.compiler'
local M = { }
local AST_COMPILE_ERROR_NUMBER = -1
local RUNTIME_ERROR_NUMBER = -3
local alt_getopt_options = "f:l:e:o:xivaASbs"
local long_opts = {
file='f',
library='l',
literal='e',
output='o',
run='x',
interactive='i',
verbose='v',
['print-ast']='a',
['print-ast-lineinfo']='A',
['print-src']='S',
['meta-bugs']='b',
['sharp-bang']='s',
}
local chunk_options = {
library=1,
file=1,
literal=1
}
local usage=[[
Compile and/or execute metalua programs. Parameters passed to the
compiler should be prefixed with an option flag, hinting what must be
done with them: take tham as file names to compile, as library names
to load, as parameters passed to the running program... When option
flags are absent, metalua tries to adopt a "Do What I Mean" approach:
- if no code (no library, no literal expression and no file) is
specified, the first flag-less parameter is taken as a file name to
load.
- if no code and no parameter is passed, an interactive loop is
started.
- if a target file is specified with --output, the program is not
executed by default, unless a --run flag forces it to. Conversely,
if no --output target is specified, the code is run unless ++run
forbids it.
]]
function M.cmdline_parser(...)
local argv = {...}
local opts, optind, optarg =
alt_getopt.get_ordered_opts({...}, alt_getopt_options, long_opts)
--pp.printf("argv=%s; opts=%s, ending at %i, with optarg=%s",
-- argv, opts, optind, optarg)
local s2l = { } -- short to long option names conversion table
for long, short in pairs(long_opts) do s2l[short]=long end
local cfg = { chunks = { } }
for i, short in pairs(opts) do
local long = s2l[short]
if chunk_options[long] then table.insert(cfg.chunks, { tag=long, optarg[i] })
else cfg[long] = optarg[i] or true end
end
cfg.params = { select(optind, ...) }
return cfg
end
function M.main (...)
local cfg = M.cmdline_parser(...)
-------------------------------------------------------------------
-- Print messages if in verbose mode
-------------------------------------------------------------------
local function verb_print (fmt, ...)
if cfg.verbose then
return pp.printf ("[ "..fmt.." ]", ...)
end
end
if cfg.verbose then
verb_print("raw options: %s", cfg)
end
-------------------------------------------------------------------
-- If there's no chunk but there are params, interpret the first
-- param as a file name.
if not next(cfg.chunks) and next(cfg.params) then
local the_file = table.remove(cfg.params, 1)
verb_print("Param %q considered as a source file", the_file)
cfg.file={ the_file }
end
-------------------------------------------------------------------
-- If nothing to do, run REPL loop
if not next(cfg.chunks) and not cfg.interactive then
verb_print "Nothing to compile nor run, force interactive loop"
cfg.interactive=true
end
-------------------------------------------------------------------
-- Run if asked to, or if no --output has been given
-- if cfg.run==false it's been *forced* to false, don't override.
if not cfg.run and not cfg.output then
verb_print("No output file specified; I'll run the program")
cfg.run = true
end
local code = { }
-------------------------------------------------------------------
-- Get ASTs from sources
local last_file_idx
for i, x in ipairs(cfg.chunks) do
local compiler = mlc.new()
local tag, val = x.tag, x[1]
verb_print("Compiling %s", x)
local st, ast
if tag=='library' then
ast = { tag='Call',
{tag='Id', "require" },
{tag='String', val } }
elseif tag=='literal' then ast = compiler :src_to_ast(val)
elseif tag=='file' then
ast = compiler :srcfile_to_ast(val)
-- Isolate each file in a separate fenv
ast = { tag='Call',
{ tag='Function', { { tag='Dots'} }, ast },
{ tag='Dots' } }
ast.source = '@'..val
code.source = '@'..val
last_file_idx = i
else
error ("Bad option "..tag)
end
local valid = true -- TODO: check AST's correctness
if not valid then
pp.printf ("Cannot compile %s:\n%s", x, ast or "no msg")
os.exit (AST_COMPILE_ERROR_NUMBER)
end
ast.origin = x
table.insert(code, ast)
end
-- The last file returns the whole chunk's result
if last_file_idx then
-- transform +{ (function(...) -{ast} end)(...) }
-- into +{ return (function(...) -{ast} end)(...) }
local prv_ast = code[last_file_idx]
local new_ast = { tag='Return', prv_ast }
code[last_file_idx] = new_ast
end
-- Further uses of compiler won't involve AST transformations:
-- they can share the same instance.
-- TODO: reuse last instance if possible.
local compiler = mlc.new()
-------------------------------------------------------------------
-- AST printing
if cfg['print-ast'] or cfg['print-ast-lineinfo'] then
verb_print "Resulting AST:"
for _, x in ipairs(code) do
pp.printf("--- AST From %s: ---", x.source)
if x.origin and x.origin.tag=='File' then x=x[1][1][2][1] end
local pp_cfg = cfg['print-ast-lineinfo']
and { line_max=1, fix_indent=1, metalua_tag=1 }
or { line_max=1, metalua_tag=1, hide_hash=1 }
pp.print(x, 80, pp_cfg)
end
end
-------------------------------------------------------------------
-- Source printing
if cfg['print-src'] then
verb_print "Resulting sources:"
for _, x in ipairs(code) do
printf("--- Source From %s: ---", table.tostring(x.source, 'nohash'))
if x.origin and x.origin.tag=='File' then x=x[1][1][2] end
print (compiler :ast2string (x))
end
end
-- TODO: canonize/check AST
local bytecode = compiler :ast_to_bytecode (code)
code = nil
-------------------------------------------------------------------
-- Insert #!... command
if cfg.sharpbang then
local shbang = cfg.sharpbang
verb_print ("Adding sharp-bang directive %q", shbang)
if not shbang :match'^#!' then shbang = '#!' .. shbang end
if not shbang :match'\n$' then shbang = shbang .. '\n' end
bytecode = shbang .. bytecode
end
-------------------------------------------------------------------
-- Save to file
if cfg.output then
-- FIXME: handle '-'
verb_print ("Saving to file %q", cfg.output)
local file, err_msg = io.open(cfg.output, 'wb')
if not file then error("can't open output file: "..err_msg) end
file:write(bytecode)
file:close()
if cfg.sharpbang and os.getenv "OS" ~= "Windows_NT" then
pcall(os.execute, 'chmod a+x "'..cfg.output..'"')
end
end
-------------------------------------------------------------------
-- Run compiled code
if cfg.run then
verb_print "Running"
local f = compiler :bytecode_to_function (bytecode)
bytecode = nil
-- FIXME: isolate execution in a ring
-- FIXME: check for failures
local function print_traceback (errmsg)
return errmsg .. '\n' .. debug.traceback ('',2) .. '\n'
end
local function g() return f(unpack (cfg.params)) end
local st, msg = xpcall(g, print_traceback)
if not st then
io.stderr:write(msg)
os.exit(RUNTIME_ERROR_NUMBER)
end
end
-------------------------------------------------------------------
-- Run REPL loop
if cfg.interactive then
verb_print "Starting REPL loop"
require 'metalua.repl' .run()
end
verb_print "Done"
end
return M.main(...)