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|
# -*- ruby -*-
require 'dl'
require 'dl/types'
module DL
module Importable
LIB_MAP = {}
module Internal
def dlload(*libnames)
if( !defined?(@LIBS) )
@LIBS = []
end
libnames.each{|libname|
if( !LIB_MAP[libname] )
LIB_MAP[libname] = DL.dlopen(libname)
end
@LIBS.push(LIB_MAP[libname])
}
end
alias dllink :dlload
# example:
# extern "int strlen(char*)"
#
def extern(proto)
proto = proto.gsub(/\s+/, " ").strip
case proto
when /^([\d\w\*_\s]+)\(([\d\w\*_\s\,\[\]]*)\)$/
ret = $1
args = $2
ret = ret.split(/\s+/)
args = args.split(/\s*,\s*/)
func = ret.pop
ret = ret.join(" ")
return import(func, ret, args)
else
raise(RuntimeError,"can't parse the function prototype: #{proto}")
end
end
# example:
# import("get_length", "int", ["void*", "int"])
#
def import(name, rettype, argtypes = nil)
if( !defined?(@SYM) )
@SYM = {}
end
@LIBS.each{|lib|
rty,_,rdec = encode_type(rettype)
ty,enc,dec = encode_types(argtypes)
symty = rty + ty
begin
sym = lib[name, symty]
rescue
next
end
mname = name.dup
if( ?A <= mname[0] && mname[0] <= ?Z )
mname[0,1] = mname[0,1].downcase
end
@SYM[mname] = [sym,rdec,enc,dec]
module_eval [
"def #{mname}(*args)",
" sym,rdec,enc,dec = @SYM['#{mname}']",
" args = enc.call(args) if enc",
if( $DEBUG )
" p \"[DL] call #{mname} with \#{args.inspect}\""
else
""
end,
" r,rs = sym.call(*args)",
if( $DEBUG )
" p \"[DL] retval=\#{r.inspect} args=\#{rs.inspect}\""
else
""
end,
" r = rdec.call(r) if rdec",
" rs = dec.call(rs) if dec",
" @retval = r",
" @args = rs",
" return @retval",
"end",
"module_function :#{mname}",
].join("\n")
return @SYM[mname]
}
raise(RuntimeError, "can't find #{name}.")
end
def _args_
return @args
end
def _retval_
return @retval
end
def typealias(ty1, ty2, enc=nil, dec=nil)
check_type
@TYDEFS.unshift([ty1,ty2, enc,dec])
end
def encode_type(ty)
check_type
orig_ty = ty
enc = nil
dec = nil
@TYDEFS.each{|t1,t2,c1,c2|
if( t1.is_a?(String) )
t1 = Regexp.new("^" + t1 + "$")
end
if( ty =~ t1 )
ty = ty.gsub(t1,t2)
if( enc )
if( c1 )
conv1 = enc
enc = proc{|v| c1.call(conv1.call(v))}
end
else
if( c1 )
enc = c1
end
end
if( dec )
if( c2 )
conv2 = dec
dec = proc{|v| c2.call(conv2.call(v))}
end
else
if( c2 )
dec = c2
end
end
end
}
ty = ty.strip
if( ty.length != 1 )
raise(TypeError, "unknown type: #{orig_ty}.")
end
return [ty,enc,dec]
end
def encode_types(tys)
encty = []
enc = nil
dec = nil
tys.each_with_index{|ty,idx|
ty,c1,c2 = encode_type(ty)
encty.push(ty)
if( enc )
if( c1 )
conv1 = enc
enc = proc{|v| v = conv1.call(v); v[idx] = c1.call(v[idx]); v}
end
else
if( c1 )
enc = proc{|v| v[idx] = c1.call(v[idx]); v}
end
end
if( dec )
if( c2 )
conv2 = dec
dec = proc{|v| v = conv2.call(v); v[idx] = c2.call(v[idx]); v}
end
else
if( c2 )
dec = proc{|v| v[idx] = c2.call(v[idx]); v}
end
end
}
return [encty.join, enc, dec]
end
def check_type
if( !defined?(@TYDEFS) )
init_type
end
end
def init_type
@TYDEFS = TYPES.collect{|ty| ty[0..3]}
end
end # end of Internal
include Internal
end # end of Importable
end
|
