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# -*- ruby -*-
require 'dl'
require 'dl/types'
module DL
module Importable
LIB_MAP = {}
module Internal
def init_types()
if( !@types )
@types = ::DL::Types.new
end
end
def init_sym()
if( !@SYM )
@SYM = {}
end
end
def [](name)
return @SYM[name.to_s][0]
end
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
def parse_cproto(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
if( func =~ /^\*/ )
func.gsub!(/^\*+/,"")
ret.push("*")
end
ret = ret.join(" ")
return [func, ret, args]
else
raise(RuntimeError,"can't parse the function prototype: #{proto}")
end
end
# example:
# extern "int strlen(char*)"
#
def extern(proto)
func,ret,args = parse_cproto(proto)
return import(func, ret, args)
end
# example:
# callback "int method_name(int, char*)"
#
def callback(proto)
func,ret,args = parse_cproto(proto)
init_types()
init_sym()
rty,_,rdec = @types.encode_type(ret)
ty,enc,dec = encode_types(args)
symty = rty + ty
module_eval("module_function :#{func}")
sym = module_eval [
"DL::callback(\"#{symty}\"){|*args|",
" sym,rdec,enc,dec = @SYM['#{func}']",
" args = enc.call(args) if enc",
" r,rs = #{func}(*args)",
" r = rdec.call(r) if rdec",
" rs = dec.call(rs) if dec",
" @retval = r",
" @args = rs",
" @retval",
"}",
].join("\n")
@SYM[func] = [sym,rdec,enc,dec]
return sym
end
# example:
# typealias("uint", "unsigned int")
#
def typealias(*args)
init_types()
@types.typealias(*args)
end
# example:
# import("get_length", "int", ["void*", "int"])
#
def import(name, rettype, argtypes = nil)
init_types()
init_sym()
rty,_,rdec = @types.encode_type(rettype)
ty,enc,dec = encode_types(argtypes)
symty = rty + ty
@LIBS.each{|lib|
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
}
raise(RuntimeError, "can't find #{name}.")
end
def _args_
return @args
end
def _retval_
return @retval
end
def encode_types(tys)
init_types()
encty = []
enc = nil
dec = nil
tys.each_with_index{|ty,idx|
ty,c1,c2,_,_ = @types.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
end # end of Internal
include Internal
end # end of Importable
end
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