added the go wrapper files. work in progress

2023-10-27 18:20:02 +09:00
parent f19b971645
commit de94b4e66f
34 changed files with 11722 additions and 5465 deletions
--- a/go/Makefile.am
+++ b/go/Makefile.am
@ -0,0 +1,41 @@
+AUTOMAKE_OPTIONS = nostdinc
+
+## the attempt to compose a proper procedure using a regular compiler failed.
+## e.g ./configure GOC=opt/go/pkg/tool/linux_amd64/
+## while go.m4 is included in autoconf 2.71, the support for the go language
+## is very limited and the go language itself is pursuing the module based builder.
+##
+## the following is to trick autoconf/automake as if it's building go files with
+## a real compiler whereas the actual building is done thru `go build`
+
+bin_PROGRAMS = hclgo
+hclgo_SOURCES = \
+	pkg/hcl.go \
+	pkg/cb.go \
+	pkg/inst.go \
+	main.go \
+	go.mod
+hclgo_DEPENDENCIES = hclgo.bin
+
+## let the linker to move hclgo.bin to the actual target
+hclgo_LINK = mv -f hclgo.bin hclgo$(EXEEXT) || echo "FAILED TO LINK"
+
+hclgo.bin:
+	cp -pf $(abs_srcdir)/go.mod $(abs_builddir)/go.mod >/dev/null 2>&1 || true
+	chmod u+w $(abs_builddir)/go.mod ## with `make distcheck`, the echo's redirection to the file fails without this permission change
+	sed -ri "/^[[:space:]]*replace[[:space:]]+cfg[[:space:]]*=>/d" $(abs_builddir)/go.mod
+	echo -e "\nreplace cfg => $(abs_builddir)/cfg" >> $(abs_builddir)/go.mod
+	[ -f $(abs_srcdir)/go.sum ] && cp -pf $(abs_srcdir)/go.sum $(abs_builddir)/go.sum >/dev/null 2>&1 || true
+	go build -x -o $(abs_builddir)/hclgo.bin -C $(srcdir) -modfile $(abs_builddir)/go.mod
+	go clean -x -C $(srcdir) -modfile $(abs_builddir)/go.mod
+
+## the go to o recipe is fake to deceive make
+.go.o:
+	echo $< > $@
+
+.mod.o:
+	echo $< > $@
+
+
+clean-local:
+	rm -rf $(abs_builddir)/go.mod $(abs_builddir)/go.sum
--- a/go/Makefile.in
+++ b/go/Makefile.in
@ -0,0 +1,643 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+	main.go \
+	go.mod
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+	for dir in "$(DESTDIR)$(bindir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-rm -f pkg/$(DEPDIR)/$(am__dirstamp)
+	-rm -f pkg/$(am__dirstamp)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-binPROGRAMS clean-generic clean-libtool clean-local \
+	mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-binPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-binPROGRAMS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am check check-am clean \
+	clean-binPROGRAMS clean-generic clean-libtool clean-local \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-binPROGRAMS install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-binPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+hclgo.bin:
+	cp -pf $(abs_srcdir)/go.mod $(abs_builddir)/go.mod >/dev/null 2>&1 || true
+	chmod u+w $(abs_builddir)/go.mod ## with `make distcheck`, the echo's redirection to the file fails without this permission change
+	sed -ri "/^[[:space:]]*replace[[:space:]]+cfg[[:space:]]*=>/d" $(abs_builddir)/go.mod
+	echo -e "\nreplace cfg => $(abs_builddir)/cfg" >> $(abs_builddir)/go.mod
+	[ -f $(abs_srcdir)/go.sum ] && cp -pf $(abs_srcdir)/go.sum $(abs_builddir)/go.sum >/dev/null 2>&1 || true
+	go build -x -o $(abs_builddir)/hclgo.bin -C $(srcdir) -modfile $(abs_builddir)/go.mod
+	go clean -x -C $(srcdir) -modfile $(abs_builddir)/go.mod
+
+.go.o:
+	echo $< > $@
+
+.mod.o:
+	echo $< > $@
+
+clean-local:
+	rm -rf $(abs_builddir)/go.mod $(abs_builddir)/go.sum
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
--- a/go/go.mod
+++ b/go/go.mod
@ -0,0 +1,5 @@
+module hcl
+
+go 1.20
+
+require cfg v0.0.0
--- a/go/main.go
+++ b/go/main.go
@ -0,0 +1,134 @@
+package main
+
+/*
+#cgo CFLAGS: -I/home/hyung-hwan/xxx/include -g -Wall
+#cgo LDFLAGS: -L/home/hyung-hwan/xxx/lib -lhcl -ldl -lquadmath
+
+#include <hcl.h>
+#include <stdlib.h>
+
+extern int go_read_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg);
+extern int go_scan_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg);
+extern int go_print_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg);
+
+int read_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg)
+{
+	return go_read_handler(hcl, cmd, arg);
+}
+
+int scan_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg)
+{
+	return go_scan_handler(hcl, cmd, arg);
+}
+
+int print_handler (hcl_t* hcl, hcl_iocmd_t cmd, void* arg)
+{
+	return go_print_handler(hcl, cmd, arg);
+}
+*/
+//import "C"
+
+import (
+	"fmt"
+	hcl "hcl/pkg"
+	"os"
+	"cfg"
+)
+
+/*
+	func run_hcl() {
+		var hcl *C.hcl_t = C.hcl_openstd(0, nil)
+		var src []uint16 = utf16.Encode(([]rune)(
+			`(printf ">>>>>>>>> [%d]\n" (+ 30 455))
+
+(printf ">>>>>>>>> [%d]\n" (+ 11 455))
+#include "a.hcl"
+(printf ">>>>>>>>> [%d]\n" (+ 20 455))
+`))
+
+		if hcl == nil {
+			log.Printf("Unable to open HCL\n")
+		} else {
+			var (
+				x       C.int
+				logmask C.hcl_bitmask_t
+				tgt     *C.char
+				empty   *C.char
+				r       C.hcl_oop_t
+			)
+
+			logmask = ^C.hcl_bitmask_t(0)
+			tgt = C.CString("/dev/stderr")
+			defer C.free(unsafe.Pointer(tgt))
+
+			empty = C.CString("")
+			defer C.free(unsafe.Pointer(empty))
+
+			C.hcl_setoption(hcl, C.HCL_LOG_MASK, unsafe.Pointer(&logmask))
+			C.hcl_setoption(hcl, C.HCL_LOG_TARGET_BCSTR, unsafe.Pointer(tgt))
+
+			_ = C.hcl_ignite(hcl, 1000000)
+			//fmt.Printf ("ignire %d\n", x)
+			_ = C.hcl_addbuiltinprims(hcl)
+			//fmt.Printf ("addbuiltinprims %d\n", x)
+			//_ = C.hcl_attachiostdwithbcstr(hcl, empty, empty, empty)
+			//x = C.hcl_attachio(hcl, (*[0]byte)(C.read_handler), (*[0]byte)(C.scan_handler), (*[0]byte)(C.print_handler))
+			x = C.hcl_attachio(hcl, C.hcl_ioimpl_t(C.read_handler), C.hcl_ioimpl_t(C.scan_handler), C.hcl_ioimpl_t(C.print_handler))
+			if x <= -1 {
+				log.Printf("unable to attach IO handlers -  %d - %s\n", x, C.GoString(C.hcl_geterrbmsg(hcl)))
+				goto done
+			}
+			_ = C.hcl_beginfeed(hcl, nil)
+			//fmt.Printf ("beginfeed %d\n", x)
+			_ = C.hcl_feed(hcl, (*C.ushort)(&src[0]), (C.ulong)(len(src)))
+			//fmt.Printf ("feed %d\n", x)
+			_ = C.hcl_endfeed(hcl)
+			//fmt.Printf ("endfeed %d => bclen %d\n", x, C.hcl_getbclen(hcl))
+			_ = x
+
+			C.hcl_decode(hcl, 0, C.hcl_getbclen(hcl))
+			logmask = 0
+			C.hcl_setoption(hcl, C.HCL_LOG_MASK, unsafe.Pointer(&logmask))
+			r = C.hcl_execute(hcl)
+			if r == nil {
+				fmt.Printf("Error - %s\n", C.GoString(C.hcl_geterrbmsg(hcl)))
+			}
+
+		done:
+			C.hcl_close(hcl)
+		}
+	}
+*/
+func main() {
+	//run_hcl()
+
+
+/*
+	var rfh hcl.ReadFileHandler
+	var sfh hcl.ScanFileHandler
+	var pfh hcl.PrintFileHandler
+*/
+	fmt.Printf ("bindir = %s\n", cfg.BINDIR)
+
+	x, err := hcl.New()
+	if err != nil {
+		fmt.Printf("ERROR %s\n", err)
+		os.Exit(1)
+	}
+	x.Ignite(1000000)
+	x.AddBuiltinPrims()
+
+/*
+	err = x.AttachIO(&rfh, &sfh, &pfh)
+	if err != nil {
+		fmt.Printf("Error - %s", err.Error())
+	}
+	x.FeedString(`(printf ">>>>>>>>> [%d]\n" (+ 30 455))
+(printf ">>>>>>>>> [%d]\n" (+ 11 455))
+#include "a.hcl"
+(printf ">>>>>>>>> [%d]\n" (+ 20 455))`)
+	x.EndFeed()
+	x.Execute()
+	x.Close()
+*/
+}
--- a/go/pkg/cb.go
+++ b/go/pkg/cb.go
@ -0,0 +1,460 @@
+package hcl
+
+/*
+#cgo CFLAGS: -I/home/hyung-hwan/xxx/include -g -Wall
+#cgo LDFLAGS: -L/home/hyung-hwan/xxx/lib -lhcl -ldl -lquadmath
+
+#include <hcl.h>
+#include <hcl-utl.h>
+*/
+import "C"
+
+import (
+//	"bufio"
+//	"io"
+	"os"
+//	"sync"
+//	"unsafe"
+)
+
+type IOHandle struct {
+	file *os.File
+	ioif interface{}
+}
+/*
+type IOHandleTable struct {
+	mtx        sync.Mutex
+	handles    []IOHandle
+	free_slots []int
+}
+
+func (io *IOHandleTable) add_io_handle(f *os.File, ioif interface{}) int {
+	io.mtx.Lock()
+	defer io.mtx.Unlock()
+
+	var n int = len(io.free_slots)
+
+	if n <= 0 { // no free slots
+		io.handles = append(io.handles, IOHandle{file: f, ioif: ioif})
+		return len(io.handles) - 1
+	} else {
+		var slot int
+		n--
+		slot = io.free_slots[n]
+		io.free_slots = io.free_slots[:n]
+		io.handles[slot].file = f
+		io.handles[slot].ioif = ioif
+		return slot
+	}
+}
+
+func (io *IOHandleTable) del_io_handle(slot int) IOHandle {
+	var (
+		h IOHandle
+		n int
+	)
+
+	io.mtx.Lock()
+	defer io.mtx.Unlock()
+
+	h = io.handles[slot]
+	io.handles[slot].file = nil
+	io.handles[slot].ioif = nil
+
+	n = len(io.handles)
+	if slot == n-1 {
+		io.handles = io.handles[:n-1]
+	} else {
+		io.free_slots = append(io.free_slots, slot)
+	}
+
+	return h
+}
+
+func (io *IOHandleTable) slot_to_io_handle(slot int) IOHandle {
+	io.mtx.Lock()
+	defer io.mtx.Unlock()
+	return io.handles[slot]
+}
+
+var io_tab IOHandleTable = IOHandleTable{}
+
+//export go_read_handler
+func go_read_handler(c *C.hcl_t, cmd C.hcl_iocmd_t, arg unsafe.Pointer) C.int {
+	var (
+		g   *HCL
+		err error
+	)
+
+	g = c_to_go(c)
+
+	switch cmd {
+	case C.HCL_IO_OPEN:
+		var (
+			ioarg         *C.hcl_iosrarg_t
+			name          string
+			includer_name string
+			fd            int
+		)
+
+		ioarg = (*C.hcl_iosrarg_t)(arg)
+		if ioarg.name == nil { // main stream when it's not feed based.
+			name = ""
+		} else {
+			var k []rune = ucstr_to_rune_slice(ioarg.name)
+			name = string(k)
+		}
+
+		if ioarg.includer == nil || ioarg.includer.name == nil {
+			includer_name = ""
+		} else {
+			var k []rune = ucstr_to_rune_slice(ioarg.includer.name)
+			includer_name = string(k)
+		}
+
+		fd, err = g.io.r.Open(g, name, includer_name)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+
+		ioarg.handle = unsafe.Pointer(uintptr(fd))
+		return 0
+
+	case C.HCL_IO_CLOSE:
+		var ioarg *C.hcl_iosrarg_t = (*C.hcl_iosrarg_t)(arg)
+		g.io.r.Close(int(uintptr(ioarg.handle)))
+		return 0
+
+	case C.HCL_IO_READ:
+		var (
+			ioarg *C.hcl_iosrarg_t
+			n     int
+			i     int
+			buf   []rune
+		)
+		ioarg = (*C.hcl_iosrarg_t)(arg)
+
+		buf = make([]rune, 1024) // TODO:  different size...
+		n, err = g.io.r.Read(int(uintptr(ioarg.handle)), buf)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+
+		for i = 0; i < n; i++ { // TODO: use a proper conversion when the rune size is different from hio_uch_t
+			ioarg.buf[i] = C.hcl_uch_t(buf[i])
+		}
+		ioarg.xlen = C.hcl_oow_t(n)
+		return 0
+	}
+
+	C.hcl_seterrnum(c, C.HCL_ENOIMPL)
+	return -1
+}
+
+//export go_scan_handler
+func go_scan_handler(c *C.hcl_t, cmd C.hcl_iocmd_t, arg unsafe.Pointer) C.int {
+	var (
+		g   *HCL
+		err error
+	)
+
+	g = c_to_go(c)
+
+	switch cmd {
+	case C.HCL_IO_OPEN:
+		err = g.io.s.Open(g)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+
+		// we don't need to set ioarg.handle because the c object to go object
+		// mapping has been established and it doesn't handle multiple streams
+		return 0
+
+	case C.HCL_IO_CLOSE:
+		g.io.s.Close()
+		return 0
+
+	case C.HCL_IO_READ:
+		var (
+			ioarg *C.hcl_ioinarg_t
+			n     int
+			err   error
+			buf   []rune
+		)
+		ioarg = (*C.hcl_ioinarg_t)(arg)
+
+		buf = make([]rune, 1024) // TODO:  different size...
+		n, err = g.io.s.Read(buf)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+		ioarg.xlen = C.ulong(n)
+		return 0
+	}
+
+	C.hcl_seterrnum(c, C.HCL_ENOIMPL)
+	return -1
+}
+
+//export go_print_handler
+func go_print_handler(c *C.hcl_t, cmd C.hcl_iocmd_t, arg unsafe.Pointer) C.int {
+	var (
+		g   *HCL
+		err error
+	)
+
+	g = c_to_go(c)
+
+	switch cmd {
+	case C.HCL_IO_OPEN:
+		err = g.io.p.Open(g)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+
+		// we don't need to set ioarg.handle because the c object to go object
+		// mapping has been established and it doesn't handle multiple streams
+		return 0
+
+	case C.HCL_IO_CLOSE:
+		g.io.p.Close()
+		return 0
+
+	case C.HCL_IO_WRITE:
+		var (
+			ioarg *C.hcl_iooutarg_t
+			data  []rune
+			err   error
+		)
+		ioarg = (*C.hcl_iooutarg_t)(arg)
+		data = uchars_to_rune_slice((*C.hcl_uch_t)(ioarg.ptr), uintptr(ioarg.len))
+		err = g.io.p.Write(data)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+		ioarg.xlen = C.hcl_oow_t(len(data))
+		return 0
+
+	case C.HCL_IO_WRITE_BYTES:
+		var (
+			ioarg *C.hcl_iooutarg_t
+			data  []byte
+			err   error
+		)
+		ioarg = (*C.hcl_iooutarg_t)(arg)
+		data = unsafe.Slice((*byte)(ioarg.ptr), ioarg.len)
+		err = g.io.p.WriteBytes(data)
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+		ioarg.xlen = C.hcl_oow_t(len(data))
+		return 0
+
+	case C.HCL_IO_FLUSH:
+		var err error = g.io.p.Flush()
+		if err != nil {
+			C.hcl_seterrbmsg(c, C.HCL_ENOIMPL, C.CString(err.Error()))
+			return -1
+		}
+		return 0
+	}
+
+	C.hcl_seterrnum(c, C.HCL_ENOIMPL)
+	return -1
+}
+
+// ------------------------------------------------------
+type ReadFileHandler struct {
+	g *HCL
+}
+
+func (p *ReadFileHandler) Open(g *HCL, name string, includer_name string) (int, error) {
+	var (
+		f   *os.File
+		r   *bufio.Reader
+		fd  int
+		err error
+	)
+
+	if name == "" {
+		f = os.Stdin
+	} else {
+		f, err = os.Open(name)
+		if err != nil {
+			return -1, err
+		}
+	}
+
+	r = bufio.NewReader(f)
+	fd = io_tab.add_io_handle(f, r)
+
+	p.g = g
+	return fd, nil
+}
+
+func (p *ReadFileHandler) Close(fd int) {
+	var hnd IOHandle = io_tab.slot_to_io_handle(fd)
+	if hnd.file != nil {
+		if hnd.file != os.Stdout && hnd.file != os.Stderr {
+			hnd.file.Close()
+		}
+		hnd.file = nil
+		hnd.ioif = nil
+	}
+}
+
+func (p *ReadFileHandler) Read(fd int, buf []rune) (int, error) {
+	var (
+		hnd IOHandle
+		i   int
+		c   rune
+		r   *bufio.Reader
+		err error
+	)
+
+	hnd = io_tab.slot_to_io_handle(fd)
+	r, _ = hnd.ioif.(*bufio.Reader)
+	for i = 0; i < len(buf); i++ {
+		c, _, err = r.ReadRune()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return -1, err
+		}
+
+		buf[i] = c
+	}
+
+	return i, nil
+}
+
+// ------------------------------------------------------
+type ScanFileHandler struct {
+	g *HCL
+	f *os.File
+	r *bufio.Reader
+}
+
+func (p *ScanFileHandler) Open(g *HCL) error {
+	var (
+		f *os.File
+	//	err error
+	)
+
+	f = os.Stdin
+		//f, err = os.Open("/dev/stdin")
+		//if err != nil {
+		//	return err
+		//}
+
+	p.r = bufio.NewReader(f)
+	p.f = f
+	p.g = g
+
+	return nil
+}
+
+func (p *ScanFileHandler) Close() {
+	if p.f != nil {
+		if p.f != os.Stdout && p.f != os.Stderr {
+			p.f.Close()
+		}
+		p.f = nil
+		p.r = nil
+	}
+}
+
+func (p *ScanFileHandler) Read(buf []rune) (int, error) {
+	var (
+		i   int
+		c   rune
+		err error
+	)
+
+	// flush all pending print out before reading
+	p.g.io.p.Flush()
+
+	for i = 0; i < len(buf); i++ {
+		c, _, err = p.r.ReadRune()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return -1, err
+		}
+
+		buf[i] = c
+	}
+
+	return i, nil
+}
+
+// ------------------------------------------------------
+
+type PrintFileHandler struct {
+	f *os.File
+	w *bufio.Writer
+}
+
+func (p *PrintFileHandler) Open(g *HCL) error {
+	var (
+		f *os.File
+	//	err error
+	)
+	
+//		f, err = os.OpenFile("/dev/stdout", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+//		if err != nil {
+//			return err
+//		}
+
+	f = os.Stdout
+
+	p.w = bufio.NewWriter(f)
+	p.f = f
+
+	//fmt.Fprintf(os.Stderr, "XXXXXXXXXX open porint\n")
+	return nil
+}
+
+func (p *PrintFileHandler) Close() {
+
+	//fmt.Fprintf(os.Stderr, "XXXXXXXXXX close porint\n")
+	if p.f != nil {
+		if p.f != os.Stdout && p.f != os.Stderr {
+			p.f.Close()
+		}
+		p.f = nil
+		p.w = nil
+	}
+}
+
+func (p *PrintFileHandler) Write(data []rune) error {
+	var err error
+
+	//fmt.Fprintf(os.Stderr, "XXXXXXXXXX write porint\n")
+	_, err = p.w.WriteString(string(data))
+	p.w.Flush() // TODO: is this needed?
+	return err
+}
+
+func (p *PrintFileHandler) WriteBytes(data []byte) error {
+	var err error
+
+	//fmt.Fprintf(os.Stderr, "XXXXXXXXXX write porint\n")
+	_, err = p.w.Write(data)
+	p.w.Flush() // TODO: is this needed?
+	return err
+}
+
+func (p *PrintFileHandler) Flush() error {
+	//fmt.Fprintf(os.Stderr, "XXXXXXXXXX flush porint\n")
+	return p.w.Flush()
+}
+*/
--- a/go/pkg/hcl.go
+++ b/go/pkg/hcl.go
@ -0,0 +1,105 @@
+package hcl
+
+/*
+#cgo CFLAGS: -I/home/hyung-hwan/xxx/include -g -Wall
+#cgo LDFLAGS: -L/home/hyung-hwan/xxx/lib -lhcl -ldl -lquadmath
+
+#include <hcl.h>
+#include <hcl-utl.h>
+*/
+import "C"
+
+import (
+	"fmt"
+	"runtime"
+//	"unsafe"
+)
+
+type HCL struct {
+	inst *C.hcl_t
+	no int
+
+	io struct {
+		r IOHandle
+		w IOHandle
+	}
+}
+
+var inst_table InstanceTable
+
+func deregister_instance(hcl *HCL) {
+	if (hcl.no >= 0) {
+		inst_table.delete_instance(hcl.no)
+		hcl.no = -1
+	}
+}
+
+func New() (*HCL, error) {
+	var inst *C.hcl_t
+	var hcl* HCL
+	inst = C.hcl_open(nil, 0, nil, nil) // TODO: prim in, errnum out
+	hcl = &HCL{inst: inst, no : -1}
+
+	runtime.SetFinalizer(hcl, deregister_instance)
+	hcl.no = inst_table.add_instance(inst, hcl)
+
+	return hcl, nil
+}
+
+func (hcl *HCL) Close() {
+	C.hcl_close (hcl.inst)
+	deregister_instance (hcl)
+}
+
+func (hcl *HCL) Ignite(memsize uintptr) error {
+	if C.hcl_ignite(hcl.inst, C.hcl_oow_t(memsize)) <= -1 {
+		// TODO: need to convert string...
+		return fmt.Errorf ("unable to ignite: %s", ucstr_to_rune_slice(C.hcl_geterrstr(hcl.inst)))
+	}
+
+	return nil
+}
+
+func (hcl *HCL) AddBuiltinPrims() error {
+	if C.hcl_addbuiltinprims(hcl.inst) <= -1 {
+	}
+	return nil
+}
+
+func (hcl *HCL) AttachIO() error {
+	return nil
+}
+
+func (hcl *HCL) FeedString(str []rune) error {
+	return nil
+}
+
+func (hcl *HCL) BeginFeed()  {
+}
+
+func (hcl *HCL) EndFeed()  {
+}
+
+func (hcl *HCL) Execute() {
+}
+
+func ucstr_to_rune_slice(str *C.hcl_uch_t) []rune {
+	return uchars_to_rune_slice(str, uintptr(C.hcl_count_ucstr(str)))
+}
+
+func uchars_to_rune_slice(str *C.hcl_uch_t, len uintptr) []rune {
+	var res []rune
+	var i uintptr
+
+	// TODO: proper encoding...
+	res = make([]rune, len)
+	for i = 0; i < len; i++ {
+//TODO		res[i] := str[i]
+	}
+	return res
+}
+
+
+func c_to_go (inst *C.hcl_t) *HCL {
+	return nil
+}
--- a/go/pkg/inst.go
+++ b/go/pkg/inst.go
@ -0,0 +1,68 @@
+package hcl
+
+/*
+#include <hcl.h>
+*/
+import "C"
+import (
+	"sync"
+)
+
+type Instance struct {
+	c *C.hcl_t // c object
+	g *HCL     // go object
+}
+
+type InstanceTable struct {
+	mtx        sync.Mutex
+	insts      []Instance
+	free_slots []int
+}
+
+func (itab *InstanceTable) add_instance(c *C.hcl_t, g *HCL) int {
+	itab.mtx.Lock()
+	defer itab.mtx.Unlock()
+
+	var n int = len(itab.free_slots)
+
+	if n <= 0 { // no free slots
+		itab.insts = append(itab.insts, Instance{c: c, g: g})
+		return len(itab.insts) - 1
+	} else {
+		var slot int
+		n--
+		slot = itab.free_slots[n]
+		itab.free_slots = itab.free_slots[:n]
+		itab.insts[slot].c = c
+		return slot
+	}
+}
+
+func (itab *InstanceTable) delete_instance(slot int) Instance {
+	var (
+		h Instance
+		n int
+	)
+
+	itab.mtx.Lock()
+	defer itab.mtx.Unlock()
+
+	h = itab.insts[slot]
+	itab.insts[slot].c = nil
+	itab.insts[slot].g = nil
+
+	n = len(itab.insts)
+	if slot == n-1 {
+		itab.insts = itab.insts[:n-1]
+	} else {
+		itab.free_slots = append(itab.free_slots, slot)
+	}
+
+	return h
+}
+
+func (itab *InstanceTable) slot_to_instance(slot int) Instance {
+	itab.mtx.Lock()
+	defer itab.mtx.Unlock()
+	return itab.insts[slot]
+}