Aegisub/subprojects/luajit/dynasm/dynasm.lua

1095 lines
30 KiB
Lua

------------------------------------------------------------------------------
-- DynASM. A dynamic assembler for code generation engines.
-- Originally designed and implemented for LuaJIT.
--
-- Copyright (C) 2005-2017 Mike Pall. All rights reserved.
-- See below for full copyright notice.
------------------------------------------------------------------------------
-- Application information.
local _info = {
name = "DynASM",
description = "A dynamic assembler for code generation engines",
version = "1.3.0",
vernum = 10300,
release = "2011-05-05",
author = "Mike Pall",
url = "http://luajit.org/dynasm.html",
license = "MIT",
copyright = [[
Copyright (C) 2005-2017 Mike Pall. All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
[ MIT license: http://www.opensource.org/licenses/mit-license.php ]
]],
}
-- Cache library functions.
local type, pairs, ipairs = type, pairs, ipairs
local pcall, error, assert = pcall, error, assert
local _s = string
local sub, match, gmatch, gsub = _s.sub, _s.match, _s.gmatch, _s.gsub
local format, rep, upper = _s.format, _s.rep, _s.upper
local _t = table
local insert, remove, concat, sort = _t.insert, _t.remove, _t.concat, _t.sort
local exit = os.exit
local io = io
local stdin, stdout, stderr = io.stdin, io.stdout, io.stderr
------------------------------------------------------------------------------
-- Program options.
local g_opt = {}
-- Global state for current file.
local g_fname, g_curline, g_indent, g_lineno, g_synclineno, g_arch
local g_errcount = 0
-- Write buffer for output file.
local g_wbuffer, g_capbuffer
------------------------------------------------------------------------------
-- Write an output line (or callback function) to the buffer.
local function wline(line, needindent)
local buf = g_capbuffer or g_wbuffer
buf[#buf+1] = needindent and g_indent..line or line
g_synclineno = g_synclineno + 1
end
-- Write assembler line as a comment, if requestd.
local function wcomment(aline)
if g_opt.comment then
wline(g_opt.comment..aline..g_opt.endcomment, true)
end
end
-- Resync CPP line numbers.
local function wsync()
if g_synclineno ~= g_lineno and g_opt.cpp then
wline("#line "..g_lineno..' "'..g_fname..'"')
g_synclineno = g_lineno
end
end
-- Dummy action flush function. Replaced with arch-specific function later.
local function wflush(term)
end
-- Dump all buffered output lines.
local function wdumplines(out, buf)
for _,line in ipairs(buf) do
if type(line) == "string" then
assert(out:write(line, "\n"))
else
-- Special callback to dynamically insert lines after end of processing.
line(out)
end
end
end
------------------------------------------------------------------------------
-- Emit an error. Processing continues with next statement.
local function werror(msg)
error(format("%s:%s: error: %s:\n%s", g_fname, g_lineno, msg, g_curline), 0)
end
-- Emit a fatal error. Processing stops.
local function wfatal(msg)
g_errcount = "fatal"
werror(msg)
end
-- Print a warning. Processing continues.
local function wwarn(msg)
stderr:write(format("%s:%s: warning: %s:\n%s\n",
g_fname, g_lineno, msg, g_curline))
end
-- Print caught error message. But suppress excessive errors.
local function wprinterr(...)
if type(g_errcount) == "number" then
-- Regular error.
g_errcount = g_errcount + 1
if g_errcount < 21 then -- Seems to be a reasonable limit.
stderr:write(...)
elseif g_errcount == 21 then
stderr:write(g_fname,
":*: warning: too many errors (suppressed further messages).\n")
end
else
-- Fatal error.
stderr:write(...)
return true -- Stop processing.
end
end
------------------------------------------------------------------------------
-- Map holding all option handlers.
local opt_map = {}
local opt_current
-- Print error and exit with error status.
local function opterror(...)
stderr:write("dynasm.lua: ERROR: ", ...)
stderr:write("\n")
exit(1)
end
-- Get option parameter.
local function optparam(args)
local argn = args.argn
local p = args[argn]
if not p then
opterror("missing parameter for option `", opt_current, "'.")
end
args.argn = argn + 1
return p
end
------------------------------------------------------------------------------
-- Core pseudo-opcodes.
local map_coreop = {}
-- Dummy opcode map. Replaced by arch-specific map.
local map_op = {}
-- Forward declarations.
local dostmt
local readfile
------------------------------------------------------------------------------
-- Map for defines (initially empty, chains to arch-specific map).
local map_def = {}
-- Pseudo-opcode to define a substitution.
map_coreop[".define_2"] = function(params, nparams)
if not params then return nparams == 1 and "name" or "name, subst" end
local name, def = params[1], params[2] or "1"
if not match(name, "^[%a_][%w_]*$") then werror("bad or duplicate define") end
map_def[name] = def
end
map_coreop[".define_1"] = map_coreop[".define_2"]
-- Define a substitution on the command line.
function opt_map.D(args)
local namesubst = optparam(args)
local name, subst = match(namesubst, "^([%a_][%w_]*)=(.*)$")
if name then
map_def[name] = subst
elseif match(namesubst, "^[%a_][%w_]*$") then
map_def[namesubst] = "1"
else
opterror("bad define")
end
end
-- Undefine a substitution on the command line.
function opt_map.U(args)
local name = optparam(args)
if match(name, "^[%a_][%w_]*$") then
map_def[name] = nil
else
opterror("bad define")
end
end
-- Helper for definesubst.
local gotsubst
local function definesubst_one(word)
local subst = map_def[word]
if subst then gotsubst = word; return subst else return word end
end
-- Iteratively substitute defines.
local function definesubst(stmt)
-- Limit number of iterations.
for i=1,100 do
gotsubst = false
stmt = gsub(stmt, "#?[%w_]+", definesubst_one)
if not gotsubst then break end
end
if gotsubst then wfatal("recursive define involving `"..gotsubst.."'") end
return stmt
end
-- Dump all defines.
local function dumpdefines(out, lvl)
local t = {}
for name in pairs(map_def) do
t[#t+1] = name
end
sort(t)
out:write("Defines:\n")
for _,name in ipairs(t) do
local subst = map_def[name]
if g_arch then subst = g_arch.revdef(subst) end
out:write(format(" %-20s %s\n", name, subst))
end
out:write("\n")
end
------------------------------------------------------------------------------
-- Support variables for conditional assembly.
local condlevel = 0
local condstack = {}
-- Evaluate condition with a Lua expression. Substitutions already performed.
local function cond_eval(cond)
local func, err
if setfenv then
func, err = loadstring("return "..cond, "=expr")
else
-- No globals. All unknown identifiers evaluate to nil.
func, err = load("return "..cond, "=expr", "t", {})
end
if func then
if setfenv then
setfenv(func, {}) -- No globals. All unknown identifiers evaluate to nil.
end
local ok, res = pcall(func)
if ok then
if res == 0 then return false end -- Oh well.
return not not res
end
err = res
end
wfatal("bad condition: "..err)
end
-- Skip statements until next conditional pseudo-opcode at the same level.
local function stmtskip()
local dostmt_save = dostmt
local lvl = 0
dostmt = function(stmt)
local op = match(stmt, "^%s*(%S+)")
if op == ".if" then
lvl = lvl + 1
elseif lvl ~= 0 then
if op == ".endif" then lvl = lvl - 1 end
elseif op == ".elif" or op == ".else" or op == ".endif" then
dostmt = dostmt_save
dostmt(stmt)
end
end
end
-- Pseudo-opcodes for conditional assembly.
map_coreop[".if_1"] = function(params)
if not params then return "condition" end
local lvl = condlevel + 1
local res = cond_eval(params[1])
condlevel = lvl
condstack[lvl] = res
if not res then stmtskip() end
end
map_coreop[".elif_1"] = function(params)
if not params then return "condition" end
if condlevel == 0 then wfatal(".elif without .if") end
local lvl = condlevel
local res = condstack[lvl]
if res then
if res == "else" then wfatal(".elif after .else") end
else
res = cond_eval(params[1])
if res then
condstack[lvl] = res
return
end
end
stmtskip()
end
map_coreop[".else_0"] = function(params)
if condlevel == 0 then wfatal(".else without .if") end
local lvl = condlevel
local res = condstack[lvl]
condstack[lvl] = "else"
if res then
if res == "else" then wfatal(".else after .else") end
stmtskip()
end
end
map_coreop[".endif_0"] = function(params)
local lvl = condlevel
if lvl == 0 then wfatal(".endif without .if") end
condlevel = lvl - 1
end
-- Check for unfinished conditionals.
local function checkconds()
if g_errcount ~= "fatal" and condlevel ~= 0 then
wprinterr(g_fname, ":*: error: unbalanced conditional\n")
end
end
------------------------------------------------------------------------------
-- Search for a file in the given path and open it for reading.
local function pathopen(path, name)
local dirsep = package and match(package.path, "\\") and "\\" or "/"
for _,p in ipairs(path) do
local fullname = p == "" and name or p..dirsep..name
local fin = io.open(fullname, "r")
if fin then
g_fname = fullname
return fin
end
end
end
-- Include a file.
map_coreop[".include_1"] = function(params)
if not params then return "filename" end
local name = params[1]
-- Save state. Ugly, I know. but upvalues are fast.
local gf, gl, gcl, gi = g_fname, g_lineno, g_curline, g_indent
-- Read the included file.
local fatal = readfile(pathopen(g_opt.include, name) or
wfatal("include file `"..name.."' not found"))
-- Restore state.
g_synclineno = -1
g_fname, g_lineno, g_curline, g_indent = gf, gl, gcl, gi
if fatal then wfatal("in include file") end
end
-- Make .include and conditionals initially available, too.
map_op[".include_1"] = map_coreop[".include_1"]
map_op[".if_1"] = map_coreop[".if_1"]
map_op[".elif_1"] = map_coreop[".elif_1"]
map_op[".else_0"] = map_coreop[".else_0"]
map_op[".endif_0"] = map_coreop[".endif_0"]
------------------------------------------------------------------------------
-- Support variables for macros.
local mac_capture, mac_lineno, mac_name
local mac_active = {}
local mac_list = {}
-- Pseudo-opcode to define a macro.
map_coreop[".macro_*"] = function(mparams)
if not mparams then return "name [, params...]" end
-- Split off and validate macro name.
local name = remove(mparams, 1)
if not name then werror("missing macro name") end
if not (match(name, "^[%a_][%w_%.]*$") or match(name, "^%.[%w_%.]*$")) then
wfatal("bad macro name `"..name.."'")
end
-- Validate macro parameter names.
local mdup = {}
for _,mp in ipairs(mparams) do
if not match(mp, "^[%a_][%w_]*$") then
wfatal("bad macro parameter name `"..mp.."'")
end
if mdup[mp] then wfatal("duplicate macro parameter name `"..mp.."'") end
mdup[mp] = true
end
-- Check for duplicate or recursive macro definitions.
local opname = name.."_"..#mparams
if map_op[opname] or map_op[name.."_*"] then
wfatal("duplicate macro `"..name.."' ("..#mparams.." parameters)")
end
if mac_capture then wfatal("recursive macro definition") end
-- Enable statement capture.
local lines = {}
mac_lineno = g_lineno
mac_name = name
mac_capture = function(stmt) -- Statement capture function.
-- Stop macro definition with .endmacro pseudo-opcode.
if not match(stmt, "^%s*.endmacro%s*$") then
lines[#lines+1] = stmt
return
end
mac_capture = nil
mac_lineno = nil
mac_name = nil
mac_list[#mac_list+1] = opname
-- Add macro-op definition.
map_op[opname] = function(params)
if not params then return mparams, lines end
-- Protect against recursive macro invocation.
if mac_active[opname] then wfatal("recursive macro invocation") end
mac_active[opname] = true
-- Setup substitution map.
local subst = {}
for i,mp in ipairs(mparams) do subst[mp] = params[i] end
local mcom
if g_opt.maccomment and g_opt.comment then
mcom = " MACRO "..name.." ("..#mparams..")"
wcomment("{"..mcom)
end
-- Loop through all captured statements
for _,stmt in ipairs(lines) do
-- Substitute macro parameters.
local st = gsub(stmt, "[%w_]+", subst)
st = definesubst(st)
st = gsub(st, "%s*%.%.%s*", "") -- Token paste a..b.
if mcom and sub(st, 1, 1) ~= "|" then wcomment(st) end
-- Emit statement. Use a protected call for better diagnostics.
local ok, err = pcall(dostmt, st)
if not ok then
-- Add the captured statement to the error.
wprinterr(err, "\n", g_indent, "| ", stmt,
"\t[MACRO ", name, " (", #mparams, ")]\n")
end
end
if mcom then wcomment("}"..mcom) end
mac_active[opname] = nil
end
end
end
-- An .endmacro pseudo-opcode outside of a macro definition is an error.
map_coreop[".endmacro_0"] = function(params)
wfatal(".endmacro without .macro")
end
-- Dump all macros and their contents (with -PP only).
local function dumpmacros(out, lvl)
sort(mac_list)
out:write("Macros:\n")
for _,opname in ipairs(mac_list) do
local name = sub(opname, 1, -3)
local params, lines = map_op[opname]()
out:write(format(" %-20s %s\n", name, concat(params, ", ")))
if lvl > 1 then
for _,line in ipairs(lines) do
out:write(" |", line, "\n")
end
out:write("\n")
end
end
out:write("\n")
end
-- Check for unfinished macro definitions.
local function checkmacros()
if mac_capture then
wprinterr(g_fname, ":", mac_lineno,
": error: unfinished .macro `", mac_name ,"'\n")
end
end
------------------------------------------------------------------------------
-- Support variables for captures.
local cap_lineno, cap_name
local cap_buffers = {}
local cap_used = {}
-- Start a capture.
map_coreop[".capture_1"] = function(params)
if not params then return "name" end
wflush()
local name = params[1]
if not match(name, "^[%a_][%w_]*$") then
wfatal("bad capture name `"..name.."'")
end
if cap_name then
wfatal("already capturing to `"..cap_name.."' since line "..cap_lineno)
end
cap_name = name
cap_lineno = g_lineno
-- Create or continue a capture buffer and start the output line capture.
local buf = cap_buffers[name]
if not buf then buf = {}; cap_buffers[name] = buf end
g_capbuffer = buf
g_synclineno = 0
end
-- Stop a capture.
map_coreop[".endcapture_0"] = function(params)
wflush()
if not cap_name then wfatal(".endcapture without a valid .capture") end
cap_name = nil
cap_lineno = nil
g_capbuffer = nil
g_synclineno = 0
end
-- Dump a capture buffer.
map_coreop[".dumpcapture_1"] = function(params)
if not params then return "name" end
wflush()
local name = params[1]
if not match(name, "^[%a_][%w_]*$") then
wfatal("bad capture name `"..name.."'")
end
cap_used[name] = true
wline(function(out)
local buf = cap_buffers[name]
if buf then wdumplines(out, buf) end
end)
g_synclineno = 0
end
-- Dump all captures and their buffers (with -PP only).
local function dumpcaptures(out, lvl)
out:write("Captures:\n")
for name,buf in pairs(cap_buffers) do
out:write(format(" %-20s %4s)\n", name, "("..#buf))
if lvl > 1 then
local bar = rep("=", 76)
out:write(" ", bar, "\n")
for _,line in ipairs(buf) do
out:write(" ", line, "\n")
end
out:write(" ", bar, "\n\n")
end
end
out:write("\n")
end
-- Check for unfinished or unused captures.
local function checkcaptures()
if cap_name then
wprinterr(g_fname, ":", cap_lineno,
": error: unfinished .capture `", cap_name,"'\n")
return
end
for name in pairs(cap_buffers) do
if not cap_used[name] then
wprinterr(g_fname, ":*: error: missing .dumpcapture ", name ,"\n")
end
end
end
------------------------------------------------------------------------------
-- Sections names.
local map_sections = {}
-- Pseudo-opcode to define code sections.
-- TODO: Data sections, BSS sections. Needs extra C code and API.
map_coreop[".section_*"] = function(params)
if not params then return "name..." end
if #map_sections > 0 then werror("duplicate section definition") end
wflush()
for sn,name in ipairs(params) do
local opname = "."..name.."_0"
if not match(name, "^[%a][%w_]*$") or
map_op[opname] or map_op["."..name.."_*"] then
werror("bad section name `"..name.."'")
end
map_sections[#map_sections+1] = name
wline(format("#define DASM_SECTION_%s\t%d", upper(name), sn-1))
map_op[opname] = function(params) g_arch.section(sn-1) end
end
wline(format("#define DASM_MAXSECTION\t\t%d", #map_sections))
end
-- Dump all sections.
local function dumpsections(out, lvl)
out:write("Sections:\n")
for _,name in ipairs(map_sections) do
out:write(format(" %s\n", name))
end
out:write("\n")
end
------------------------------------------------------------------------------
-- Replacement for customized Lua, which lacks the package library.
local prefix = ""
if not require then
function require(name)
local fp = assert(io.open(prefix..name..".lua"))
local s = fp:read("*a")
assert(fp:close())
return assert(loadstring(s, "@"..name..".lua"))()
end
end
-- Load architecture-specific module.
local function loadarch(arch)
if not match(arch, "^[%w_]+$") then return "bad arch name" end
local ok, m_arch = pcall(require, "dasm_"..arch)
if not ok then return "cannot load module: "..m_arch end
g_arch = m_arch
wflush = m_arch.passcb(wline, werror, wfatal, wwarn)
m_arch.setup(arch, g_opt)
map_op, map_def = m_arch.mergemaps(map_coreop, map_def)
end
-- Dump architecture description.
function opt_map.dumparch(args)
local name = optparam(args)
if not g_arch then
local err = loadarch(name)
if err then opterror(err) end
end
local t = {}
for name in pairs(map_coreop) do t[#t+1] = name end
for name in pairs(map_op) do t[#t+1] = name end
sort(t)
local out = stdout
local _arch = g_arch._info
out:write(format("%s version %s, released %s, %s\n",
_info.name, _info.version, _info.release, _info.url))
g_arch.dumparch(out)
local pseudo = true
out:write("Pseudo-Opcodes:\n")
for _,sname in ipairs(t) do
local name, nparam = match(sname, "^(.+)_([0-9%*])$")
if name then
if pseudo and sub(name, 1, 1) ~= "." then
out:write("\nOpcodes:\n")
pseudo = false
end
local f = map_op[sname]
local s
if nparam ~= "*" then nparam = nparam + 0 end
if nparam == 0 then
s = ""
elseif type(f) == "string" then
s = map_op[".template__"](nil, f, nparam)
else
s = f(nil, nparam)
end
if type(s) == "table" then
for _,s2 in ipairs(s) do
out:write(format(" %-12s %s\n", name, s2))
end
else
out:write(format(" %-12s %s\n", name, s))
end
end
end
out:write("\n")
exit(0)
end
-- Pseudo-opcode to set the architecture.
-- Only initially available (map_op is replaced when called).
map_op[".arch_1"] = function(params)
if not params then return "name" end
local err = loadarch(params[1])
if err then wfatal(err) end
wline(format("#if DASM_VERSION != %d", _info.vernum))
wline('#error "Version mismatch between DynASM and included encoding engine"')
wline("#endif")
end
-- Dummy .arch pseudo-opcode to improve the error report.
map_coreop[".arch_1"] = function(params)
if not params then return "name" end
wfatal("duplicate .arch statement")
end
------------------------------------------------------------------------------
-- Dummy pseudo-opcode. Don't confuse '.nop' with 'nop'.
map_coreop[".nop_*"] = function(params)
if not params then return "[ignored...]" end
end
-- Pseudo-opcodes to raise errors.
map_coreop[".error_1"] = function(params)
if not params then return "message" end
werror(params[1])
end
map_coreop[".fatal_1"] = function(params)
if not params then return "message" end
wfatal(params[1])
end
-- Dump all user defined elements.
local function dumpdef(out)
local lvl = g_opt.dumpdef
if lvl == 0 then return end
dumpsections(out, lvl)
dumpdefines(out, lvl)
if g_arch then g_arch.dumpdef(out, lvl) end
dumpmacros(out, lvl)
dumpcaptures(out, lvl)
end
------------------------------------------------------------------------------
-- Helper for splitstmt.
local splitlvl
local function splitstmt_one(c)
if c == "(" then
splitlvl = ")"..splitlvl
elseif c == "[" then
splitlvl = "]"..splitlvl
elseif c == "{" then
splitlvl = "}"..splitlvl
elseif c == ")" or c == "]" or c == "}" then
if sub(splitlvl, 1, 1) ~= c then werror("unbalanced (), [] or {}") end
splitlvl = sub(splitlvl, 2)
elseif splitlvl == "" then
return " \0 "
end
return c
end
-- Split statement into (pseudo-)opcode and params.
local function splitstmt(stmt)
-- Convert label with trailing-colon into .label statement.
local label = match(stmt, "^%s*(.+):%s*$")
if label then return ".label", {label} end
-- Split at commas and equal signs, but obey parentheses and brackets.
splitlvl = ""
stmt = gsub(stmt, "[,%(%)%[%]{}]", splitstmt_one)
if splitlvl ~= "" then werror("unbalanced () or []") end
-- Split off opcode.
local op, other = match(stmt, "^%s*([^%s%z]+)%s*(.*)$")
if not op then werror("bad statement syntax") end
-- Split parameters.
local params = {}
for p in gmatch(other, "%s*(%Z+)%z?") do
params[#params+1] = gsub(p, "%s+$", "")
end
if #params > 16 then werror("too many parameters") end
params.op = op
return op, params
end
-- Process a single statement.
dostmt = function(stmt)
-- Ignore empty statements.
if match(stmt, "^%s*$") then return end
-- Capture macro defs before substitution.
if mac_capture then return mac_capture(stmt) end
stmt = definesubst(stmt)
-- Emit C code without parsing the line.
if sub(stmt, 1, 1) == "|" then
local tail = sub(stmt, 2)
wflush()
if sub(tail, 1, 2) == "//" then wcomment(tail) else wline(tail, true) end
return
end
-- Split into (pseudo-)opcode and params.
local op, params = splitstmt(stmt)
-- Get opcode handler (matching # of parameters or generic handler).
local f = map_op[op.."_"..#params] or map_op[op.."_*"]
if not f then
if not g_arch then wfatal("first statement must be .arch") end
-- Improve error report.
for i=0,9 do
if map_op[op.."_"..i] then
werror("wrong number of parameters for `"..op.."'")
end
end
werror("unknown statement `"..op.."'")
end
-- Call opcode handler or special handler for template strings.
if type(f) == "string" then
map_op[".template__"](params, f)
else
f(params)
end
end
-- Process a single line.
local function doline(line)
if g_opt.flushline then wflush() end
-- Assembler line?
local indent, aline = match(line, "^(%s*)%|(.*)$")
if not aline then
-- No, plain C code line, need to flush first.
wflush()
wsync()
wline(line, false)
return
end
g_indent = indent -- Remember current line indentation.
-- Emit C code (even from macros). Avoids echo and line parsing.
if sub(aline, 1, 1) == "|" then
if not mac_capture then
wsync()
elseif g_opt.comment then
wsync()
wcomment(aline)
end
dostmt(aline)
return
end
-- Echo assembler line as a comment.
if g_opt.comment then
wsync()
wcomment(aline)
end
-- Strip assembler comments.
aline = gsub(aline, "//.*$", "")
-- Split line into statements at semicolons.
if match(aline, ";") then
for stmt in gmatch(aline, "[^;]+") do dostmt(stmt) end
else
dostmt(aline)
end
end
------------------------------------------------------------------------------
-- Write DynASM header.
local function dasmhead(out)
out:write(format([[
/*
** This file has been pre-processed with DynASM.
** %s
** DynASM version %s, DynASM %s version %s
** DO NOT EDIT! The original file is in "%s".
*/
]], _info.url,
_info.version, g_arch._info.arch, g_arch._info.version,
g_fname))
end
-- Read input file.
readfile = function(fin)
g_indent = ""
g_lineno = 0
g_synclineno = -1
-- Process all lines.
for line in fin:lines() do
g_lineno = g_lineno + 1
g_curline = line
local ok, err = pcall(doline, line)
if not ok and wprinterr(err, "\n") then return true end
end
wflush()
-- Close input file.
assert(fin == stdin or fin:close())
end
-- Write output file.
local function writefile(outfile)
local fout
-- Open output file.
if outfile == nil or outfile == "-" then
fout = stdout
else
fout = assert(io.open(outfile, "w"))
end
-- Write all buffered lines
wdumplines(fout, g_wbuffer)
-- Close output file.
assert(fout == stdout or fout:close())
-- Optionally dump definitions.
dumpdef(fout == stdout and stderr or stdout)
end
-- Translate an input file to an output file.
local function translate(infile, outfile)
g_wbuffer = {}
g_indent = ""
g_lineno = 0
g_synclineno = -1
-- Put header.
wline(dasmhead)
-- Read input file.
local fin
if infile == "-" then
g_fname = "(stdin)"
fin = stdin
else
g_fname = infile
fin = assert(io.open(infile, "r"))
end
readfile(fin)
-- Check for errors.
if not g_arch then
wprinterr(g_fname, ":*: error: missing .arch directive\n")
end
checkconds()
checkmacros()
checkcaptures()
if g_errcount ~= 0 then
stderr:write(g_fname, ":*: info: ", g_errcount, " error",
(type(g_errcount) == "number" and g_errcount > 1) and "s" or "",
" in input file -- no output file generated.\n")
dumpdef(stderr)
exit(1)
end
-- Write output file.
writefile(outfile)
end
------------------------------------------------------------------------------
-- Print help text.
function opt_map.help()
stdout:write("DynASM -- ", _info.description, ".\n")
stdout:write("DynASM ", _info.version, " ", _info.release, " ", _info.url, "\n")
stdout:write[[
Usage: dynasm [OPTION]... INFILE.dasc|-
-h, --help Display this help text.
-V, --version Display version and copyright information.
-o, --outfile FILE Output file name (default is stdout).
-I, --include DIR Add directory to the include search path.
-c, --ccomment Use /* */ comments for assembler lines.
-C, --cppcomment Use // comments for assembler lines (default).
-N, --nocomment Suppress assembler lines in output.
-M, --maccomment Show macro expansions as comments (default off).
-L, --nolineno Suppress CPP line number information in output.
-F, --flushline Flush action list for every line.
-D NAME[=SUBST] Define a substitution.
-U NAME Undefine a substitution.
-P, --dumpdef Dump defines, macros, etc. Repeat for more output.
-A, --dumparch ARCH Load architecture ARCH and dump description.
]]
exit(0)
end
-- Print version information.
function opt_map.version()
stdout:write(format("%s version %s, released %s\n%s\n\n%s",
_info.name, _info.version, _info.release, _info.url, _info.copyright))
exit(0)
end
-- Misc. options.
function opt_map.outfile(args) g_opt.outfile = optparam(args) end
function opt_map.include(args) insert(g_opt.include, 1, optparam(args)) end
function opt_map.ccomment() g_opt.comment = "/*|"; g_opt.endcomment = " */" end
function opt_map.cppcomment() g_opt.comment = "//|"; g_opt.endcomment = "" end
function opt_map.nocomment() g_opt.comment = false end
function opt_map.maccomment() g_opt.maccomment = true end
function opt_map.nolineno() g_opt.cpp = false end
function opt_map.flushline() g_opt.flushline = true end
function opt_map.dumpdef() g_opt.dumpdef = g_opt.dumpdef + 1 end
------------------------------------------------------------------------------
-- Short aliases for long options.
local opt_alias = {
h = "help", ["?"] = "help", V = "version",
o = "outfile", I = "include",
c = "ccomment", C = "cppcomment", N = "nocomment", M = "maccomment",
L = "nolineno", F = "flushline",
P = "dumpdef", A = "dumparch",
}
-- Parse single option.
local function parseopt(opt, args)
opt_current = #opt == 1 and "-"..opt or "--"..opt
local f = opt_map[opt] or opt_map[opt_alias[opt]]
if not f then
opterror("unrecognized option `", opt_current, "'. Try `--help'.\n")
end
f(args)
end
-- Parse arguments.
local function parseargs(args)
-- Default options.
g_opt.comment = "//|"
g_opt.endcomment = ""
g_opt.cpp = true
g_opt.dumpdef = 0
g_opt.include = { "" }
-- Process all option arguments.
args.argn = 1
repeat
local a = args[args.argn]
if not a then break end
local lopt, opt = match(a, "^%-(%-?)(.+)")
if not opt then break end
args.argn = args.argn + 1
if lopt == "" then
-- Loop through short options.
for o in gmatch(opt, ".") do parseopt(o, args) end
else
-- Long option.
parseopt(opt, args)
end
until false
-- Check for proper number of arguments.
local nargs = #args - args.argn + 1
if nargs ~= 1 then
if nargs == 0 then
if g_opt.dumpdef > 0 then return dumpdef(stdout) end
end
opt_map.help()
end
-- Translate a single input file to a single output file
-- TODO: Handle multiple files?
translate(args[args.argn], g_opt.outfile)
end
------------------------------------------------------------------------------
-- Add the directory dynasm.lua resides in to the Lua module search path.
local arg = arg
if arg and arg[0] then
prefix = match(arg[0], "^(.*[/\\])")
if package and prefix then package.path = prefix.."?.lua;"..package.path end
end
-- Start DynASM.
parseargs{...}
------------------------------------------------------------------------------