/*
** $Id: luac.c,v 1.54 2006/06/02 17:37:11 lhf Exp $
** Lua compiler (saves bytecodes to files; also list bytecodes)
** See Copyright Notice in lua.h
*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define luac_c
#define LUA_CORE

#include "lua.h"
#include "lauxlib.h"

#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstring.h"
#include "lundump.h"

#define PROGNAME "luac"        /* default program name */
#define OUTPUT PROGNAME ".out" /* default output file */

static int listing = 0;                 /* list bytecodes? */
static int dumping = 1;                 /* dump bytecodes? */
static int stripping = 0;               /* strip debug information? */
static char Output[] = {OUTPUT};        /* default output file name */
static const char *output = Output;     /* actual output file name */
static const char *progname = PROGNAME; /* actual program name */

static void fatal(const char *message)
{
    fprintf(stderr, "%s: %s\n", progname, message);
    exit(EXIT_FAILURE);
}

static void cannot(const char *what)
{
    fprintf(stderr, "%s: cannot %s %s: %s\n", progname, what, output,
            strerror(errno));
    exit(EXIT_FAILURE);
}

static void usage(const char *message)
{
    if (*message == '-')
        fprintf(stderr, "%s: unrecognized option " LUA_QS "\n", progname,
                message);
    else
        fprintf(stderr, "%s: %s\n", progname, message);
    fprintf(stderr,
            "usage: %s [options] [filenames].\n"
            "Available options are:\n"
            "  -        process stdin\n"
            "  -l       list\n"
            "  -o name  output to file " LUA_QL(
                "name") " (default is \"%s\")\n"
                        "  -p       parse only\n"
                        "  -s       strip debug information\n"
                        "  -v       show version information\n"
                        "  --       stop handling options\n",
            progname, Output);
    exit(EXIT_FAILURE);
}

#define IS(s) (strcmp(argv[i], s) == 0)

static int doargs(int argc, char *argv[])
{
    int i;
    int version = 0;
    if (argv[0] != NULL && *argv[0] != 0)
        progname = argv[0];
    for (i = 1; i < argc; i++) {
        if (*argv[i] != '-') /* end of options; keep it */
            break;
        else if (IS("--")) /* end of options; skip it */
        {
            ++i;
            if (version)
                ++version;
            break;
        }
        else if (IS("-")) /* end of options; use stdin */
            break;
        else if (IS("-l")) /* list */
            ++listing;
        else if (IS("-o")) /* output file */
        {
            output = argv[++i];
            if (output == NULL || *output == 0)
                usage(LUA_QL("-o") " needs argument");
            if (IS("-"))
                output = NULL;
        }
        else if (IS("-p")) /* parse only */
            dumping = 0;
        else if (IS("-s")) /* strip debug information */
            stripping = 1;
        else if (IS("-v")) /* show version */
            ++version;
        else /* unknown option */
            usage(argv[i]);
    }
    if (i == argc && (listing || !dumping)) {
        dumping = 0;
        argv[--i] = Output;
    }
    if (version) {
        printf("%s  %s\n", LUA_RELEASE, LUA_COPYRIGHT);
        if (version == argc - 1)
            exit(EXIT_SUCCESS);
    }
    return i;
}

#define toproto(L, i) (clvalue(L->top + (i))->l.p)

static const Proto *combine(lua_State *L, int n)
{
    if (n == 1)
        return toproto(L, -1);
    else {
        int i, pc;
        Proto *f = luaF_newproto(L);
        setptvalue2s(L, L->top, f);
        incr_top(L);
        f->source = luaS_newliteral(L, "=(" PROGNAME ")");
        f->maxstacksize = 1;
        pc = 2 * n + 1;
        f->code = luaM_newvector(L, pc, Instruction);
        f->sizecode = pc;
        f->p = luaM_newvector(L, n, Proto *);
        f->sizep = n;
        pc = 0;
        for (i = 0; i < n; i++) {
            f->p[i] = toproto(L, i - n - 1);
            f->code[pc++] = CREATE_ABx(OP_CLOSURE, 0, i);
            f->code[pc++] = CREATE_ABC(OP_CALL, 0, 1, 1);
        }
        f->code[pc++] = CREATE_ABC(OP_RETURN, 0, 1, 0);
        return f;
    }
}

static int writer(lua_State *L, const void *p, size_t size, void *u)
{
    UNUSED(L);
    return (fwrite(p, size, 1, (FILE *)u) != 1) && (size != 0);
}

struct Smain {
    int argc;
    char **argv;
};

static int pmain(lua_State *L)
{
    struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
    int argc = s->argc;
    char **argv = s->argv;
    const Proto *f;
    int i;
    if (!lua_checkstack(L, argc))
        fatal("too many input files");
    for (i = 0; i < argc; i++) {
        const char *filename = IS("-") ? NULL : argv[i];
        if (luaL_loadfile(L, filename) != 0)
            fatal(lua_tostring(L, -1));
    }
    f = combine(L, argc);
    if (listing)
        luaU_print(f, listing > 1);
    if (dumping) {
        FILE *D = (output == NULL) ? stdout : fopen(output, "wb");
        if (D == NULL)
            cannot("open");
        lua_lock(L);
        luaU_dump(L, f, writer, D, stripping);
        lua_unlock(L);
        if (ferror(D))
            cannot("write");
        if (fclose(D))
            cannot("close");
    }
    return 0;
}

int main(int argc, char *argv[])
{
    lua_State *L;
    struct Smain s;
    int i = doargs(argc, argv);
    argc -= i;
    argv += i;
    if (argc <= 0)
        usage("no input files given");
    L = lua_open();
    if (L == NULL)
        fatal("not enough memory for state");
    s.argc = argc;
    s.argv = argv;
    if (lua_cpcall(L, pmain, &s) != 0)
        fatal(lua_tostring(L, -1));
    lua_close(L);
    return EXIT_SUCCESS;
}
