/*
 ** $Id: luac.c,v 1.76 2018/06/19 01:32:02 lhf Exp $
 ** Lua compiler (saves bytecodes to files; also lists bytecodes)
 ** See Copyright Notice in lua.h
 */

#define luac_c
#define LUA_CORE

#include "lprefix.h"

#include <alloca.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "lnodemcu.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "lundump.h"

static void PrintFunction(const Proto* f, int full);
#define luaU_print	PrintFunction

#define PROGNAME	"luac.cross"	/* 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 int flash = 0;			/* output flash image */
static lu_int32 address = 0;		/* output flash image at absolute location */
static lu_int32 maxSize = 0x40000;	/* maximuum uncompressed image size */
static int lookup = 0;			/* output lookup-style master combination header */
static const char *execute;		/* executed a Lua file */
char *LFSimageName;

#if 0
#define IROM0_SEG    0x40200000ul
#define IROM0_SEGMAX 0x00100000ul
#define IROM_OFFSET(a) (cast(lu_int32, (a)) - IROM0_SEG)
#else
// Safety checks disabled for now; would need to handle ESP32/ESP32S/ESP32C3
#define IROM_OFFSET(a)
#endif


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 '%s'\n", progname, message);
  else
    fprintf(stderr, "%s: %s\n", progname, message);
  fprintf(stderr,
    "usage: %s [options] [filenames]\n"
    "Available options are:\n"
    "  -l       list (use -l -l for full listing)\n"
    "  -o name  output to file 'name' (default is \"%s\")\n"
    "  -e name  execute a lua source file\n"
    "  -f       output a flash image file\n"
    "  -F name  load a flash image file\n"
    "  -a addr  generate an absolute, rather than "
               "position independent flash image file\n"
    "           (use with -F LFSimage -o absLFSimage to "
               "convert an image to absolute format)\n"
    "  -i       generate lookup combination master (default with option -f)\n"
    "  -m size  maximum LFS image in bytes\n"
    "  -p       parse only\n"
    "  -s       strip debug information\n"
    "  -v       show version information\n"
    "  --       stop handling options\n"
    "  -        stop handling options and process stdin\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;
  lu_int32 offset = 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("-e")) {                  /* execute a lua source file file */
      execute = argv[++i];
      if (execute == NULL || *execute == 0 || *execute == '-')
        usage("\"-e\" needs a file argument");
    } else if (IS("-F")) {                  /* execute a lua source file file */
      LFSimageName = argv[++i];
      if (LFSimageName == NULL || *LFSimageName == 0 || *LFSimageName == '-')
        usage("\"-F\" needs an LFS image file argument");
    } else if (IS("-f")) {                                /* Flash image file */
      flash = lookup = 1;
    } else if (IS("-a")) {                        /* Absolue flash image file */
      flash = lookup = 1;
      address = strtol(argv[++i], NULL, 0);
#if 0
      offset = IROM_OFFSET(address);
      if (offset == 0 || offset > IROM0_SEGMAX)
        usage("\"-a\" absolute address must be valid flash address");
#endif
    } else if (IS("-i")) {                                          /* lookup */
      lookup = 1;
    }  else if (IS("-l")) {                                           /* list */
      ++listing;
    } else if (IS("-m")) {                    /* specify a maximum image size */
      flash = lookup = 1;
      maxSize = strtol(argv[++i], NULL, 0);
      if (maxSize & 0xFFF)
        usage("\"-m\" maximum size must be a multiple of 4,096");
    } else if (IS("-o")) {                                     /* output file */
      output = argv[++i];
      if (output == NULL || *output == 0 || ( *output == '-' && output[1] != 0))
        usage("'-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 (offset>0 && (output == NULL || LFSimageName == NULL ||
                   execute != NULL || i != argc))
    usage("'-a' also requires '-o' and '-f' options without lua source files");

  if (i == argc && (listing || !dumping)) {
    dumping = 0;
    argv[--i] = Output;
  }
  if (version) {
    printf("%s\n", LUA_COPYRIGHT);
    if (version == argc - 1) exit(EXIT_SUCCESS);
  }
  return i;
}

static const char *corename(lua_State *L, const TString *filename, int *len) {
  (void)L;
  const char *fn = getstr(filename) + 1;
  const char *s = strrchr(fn, '/');
  if (!s) s = strrchr(fn, '\\');
  s = s ? s + 1 : fn;
  while ( *s == '.') s++;
  const char *e = strchr(s, '.');
  if (len)
    *len = e ? e - s : strlen(s);
  return s;
}

/*
** If the luac command line includes multiple files or has the -f option
** then luac generates a main function to reference all sub-main prototypes.
** This is one of two types:
**   Type 0   The standard luac combination main
**   Type 1   A lookup wrapper that is used for LFS image dumps
*/
#define toproto(L, i) getproto(L->top + (i))

static const Proto *combine(lua_State *L, int n, int type) {
  if (n == 1 && type == 0) {
    return toproto(L, -1);
  } else {
    Proto *f;
    int i, j;
   /*
    * Generate a minimal proto with 1 return, emtpy p, k & uv vectors
    */
    if (luaL_loadbuffer(L, "\n", strlen("\n"), "=("PROGNAME ")") != LUA_OK)
      fatal(lua_tostring(L, -1));
    f = toproto(L, -1);
   /*
    * Allocate the vector for and bind the sub-protos
    */
    luaM_reallocvector(L, f->p, f->sizep, n, Proto *);
    f->sizep = n;
    for (i = 0; i < n; i++) {
      f->p[i] = toproto(L, i - n - 1);
      if (f->p[i]->sizeupvalues > 0)
        f->p[i]->upvalues[0].instack = 0;
    }
    f->numparams = 0;
    f->maxstacksize = 1;
    if (type == 1) {
     /*
      * For Type 1 main(), add a k vector of strings naming the corresponding
      * protos with the Unixtime of the compile appended.
      */
      luaM_reallocvector(L, f->k, f->sizek, n+1, TValue);
      f->sizek        = n + 1;
      for (i = 0; i < n; i++) {
        int len;
        const char *name = corename(L, f->p[i]->source, &len);
        TString* sname = luaS_newlstr(L, name, len);
        for (j = 0; j < i; j++) {
          if (tsvalue(f->k+j) == sname)
            fatal(lua_pushfstring(L, "Cannot have duplicate files ('%s') in LFS", name));
        }
        setsvalue2n(L, f->k+i, sname);
      }
      setivalue(f->k+n, (lua_Integer) time(NULL));
    }
    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)[0]) != 1) && (size != 0);
}


static int msghandler (lua_State *L) {
  const char *msg = lua_tostring(L, 1);
  if (msg == NULL)  /* is error object not a string? */
    msg = lua_pushfstring(L, "(error object is a %s value)", luaL_typename(L, 1));
  luaL_traceback(L, L, msg, 1);  /* append a standard traceback */
  return 1;  /* return the traceback */
}


static int dofile (lua_State *L, const char *name) {
  int status = luaL_loadfile(L, name);
  if (status == LUA_OK) {
    int base = lua_gettop(L);
    lua_pushcfunction(L, msghandler);  /* push message handler */
    lua_insert(L, base);  /* put it under function and args */
    status = lua_pcall(L, 0, 0, base);
    lua_remove(L, base);  /* remove message handler from the stack */
  }
  if (status != LUA_OK) {
    fprintf(stderr, "%s: %s\n", PROGNAME, lua_tostring(L, -1));
    lua_pop(L, 1);  /* remove message */
  }
  return status;
}

/*
** This function is an inintended consequence of constraints in ltable.c
** rotable_findentry().  The file list generates a ROTable in LFS and the
** rule for ROTables is that metavalue entries must be at the head of the
** ROTableentry list so argv file names with basenames starting with "__"
** must be head of the list.  This is a botch. Sorry.
*/
static void reorderfiles(lua_State *L, int argc, char **list, char **argv) {
  int i, j;
  for (i = 0; i < argc; i++ ) {
    TString *file = luaS_new(L,argv[i]);
    if (strcmp("__", corename(L, file, NULL))) {
      list[i] = argv[i]; /* add to the end of the new list */
    } else {
      for (j = 0; j < i; j++)
        list[j+1] = list[j];
      list[0] = argv[i];  /* add to the start of the new list */
    }
  }
}


static int pmain(lua_State *L) {
  int argc = (int) lua_tointeger(L, 1);
  char **argv = (char **) lua_touserdata(L, 2);
  char **filelist = alloca(argc * sizeof(char *));
  const Proto *f;
  int i, status;
  if (!lua_checkstack(L, argc + 1))
    fatal("too many input files");
  if (execute || address) {
    luaL_openlibs(L);  /* the nodemcu open will throw to signal an LFS reload */
    status = dofile(L, execute);
    if (status != LUA_OK)
      return 0;
  }
  if (argc == 0)
    return 0;
  reorderfiles(L, argc, filelist, argv);
  for (i = 0; i < argc; i++) {
    const char *filename = IS("-") ? NULL : filelist[i];
    if (luaL_loadfile(L, filename) != LUA_OK)
      fatal(lua_tostring(L, -1));
//TODO: if strip = 2, replace proto->source by basename
  }
  f = combine(L, argc + (execute ? 1 : 0), lookup);
  if (listing) luaU_print(f, listing > 1);
  if (dumping) {
    int result;
    FILE *D = (output == NULL) ? stdout : fopen(output, "wb");
    if (D == NULL) cannot("open");
    lua_lock(L);
    if (flash) {
      UNUSED(address);
      UNUSED(maxSize);
      result = luaU_DumpAllProtos(L, f, writer, &D, stripping);
    } else {
      result = luaU_dump(L, f, writer, cast(void *, &D), stripping);
    }
    lua_unlock(L);
    if (result == LUA_ERR_CC_INTOVERFLOW)
      fatal("value too big or small for target integer type");
    if (result == LUA_ERR_CC_NOTINTEGER)
      fatal("target lua_Number is integral but fractional value found");
    if (ferror(D)) cannot("write");
    if (fclose(D)) cannot("close");
  }
  return 0;
}

int main(int argc, char *argv[]) {
  lua_State *L;
  int i = doargs(argc, argv);
  int j, status;
  argc -= i; argv += i;
  if (argc <= 0 && execute == 0 && address == 0) usage("no input files given");
  if (address)
    luaN_setabsolute(address);
  for (j = 0; j < 2 ; j++) {
    L = luaL_newstate();
    if (L == NULL) fatal("not enough memory for state");
    lua_pushcfunction(L, &pmain);
    lua_pushinteger(L, argc);
    lua_pushlightuserdata(L, argv);
    status = lua_pcall(L, 2, 0, 0);
    if (status != LUA_OK) {
      const char *res = luaL_optstring(L, -1, "");
      if (strcmp(res, "!LFSrestart!") == 0) {
        /*An LFS image has been loaded */
        if (address) { /* write out as absolute image and exit */
          lu_int32 size = cast(LFSHeader *, LFSregion)->flash_size;
          FILE *af = fopen(output, "wb");
          if (af == NULL) cannot("open");
          if (fwrite(LFSregion, size, 1, af) != 1) cannot("write");
          fclose(af);
          exit(0);
        }
        /*otherwise simulate a restart */
        lua_close(L);
        continue; /* and loop around once more simulating restart */
      }
      char *err = strdup(lua_tostring(L, -1));
      lua_close(L);
      fatal(err);
    }
    lua_close(L);
    break;
  }
  return EXIT_SUCCESS;
}

/*
** $Id: luac.c,v 1.76 2018/06/19 01:32:02 lhf Exp $
** print bytecodes
** See Copyright Notice in lua.h
*/

#include <ctype.h>
#include <stdio.h>

#define luac_c
#define LUA_CORE

#include "ldebug.h"
#include "lobject.h"
#include "lopcodes.h"

#define VOID(p)		((const void*)(p))

static void PrintString(const TString* ts)
{
 const char* s=getstr(ts);
 size_t i,n=tsslen(ts);
 printf("%c",'"');
 for (i=0; i<n; i++)
 {
  int c=(int)(unsigned char)s[i];
  switch (c)
  {
   case '"':  printf("\\\""); break;
   case '\\': printf("\\\\"); break;
   case '\a': printf("\\a"); break;
   case '\b': printf("\\b"); break;
   case '\f': printf("\\f"); break;
   case '\n': printf("\\n"); break;
   case '\r': printf("\\r"); break;
   case '\t': printf("\\t"); break;
   case '\v': printf("\\v"); break;
   default:	if (isprint(c))
   			printf("%c",c);
		else
			printf("\\%03d",c);
  }
 }
 printf("%c",'"');
}

static void PrintConstant(const Proto* f, int i)
{
 const TValue* o=&f->k[i];
 switch (ttype(o))
 {
  case LUA_TNIL:
	printf("nil");
	break;
  case LUA_TBOOLEAN:
	printf(bvalue(o) ? "true" : "false");
	break;
  case LUA_TNUMFLT:
	{
	char buff[100];
	sprintf(buff,LUA_NUMBER_FMT,fltvalue(o));
	printf("%s",buff);
	if (buff[strspn(buff,"-0123456789")]=='\0') printf(".0");
	break;
	}
  case LUA_TNUMINT:
	printf(LUA_INTEGER_FMT,ivalue(o));
	break;
  case LUA_TSHRSTR: case LUA_TLNGSTR:
	PrintString(tsvalue(o));
	break;
  default:				/* cannot happen */
	printf("? type=%d",ttype(o));
	break;
 }
}

#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-")
#define MYK(x)		(-1-(x))

static void PrintCode(const Proto* f)
{
 const Instruction* code=f->code;
 int pc,n=f->sizecode;
 for (pc=0; pc<n; pc++)
 {
  Instruction i=code[pc];
  OpCode o=GET_OPCODE(i);
  int a=GETARG_A(i);
  int b=GETARG_B(i);
  int c=GETARG_C(i);
  int ax=GETARG_Ax(i);
  int bx=GETARG_Bx(i);
  int sbx=GETARG_sBx(i);
  int line=getfuncline(f,pc);
  printf("\t%d\t",pc+1);
  if (line>0) printf("[%d]\t",line); else printf("[-]\t");
  printf("%-9s\t",luaP_opnames[o]);
  switch (getOpMode(o))
  {
   case iABC:
    printf("%d",a);
    if (getBMode(o)!=OpArgN) printf(" %d",ISK(b) ? (MYK(INDEXK(b))) : b);
    if (getCMode(o)!=OpArgN) printf(" %d",ISK(c) ? (MYK(INDEXK(c))) : c);
    break;
   case iABx:
    printf("%d",a);
    if (getBMode(o)==OpArgK) printf(" %d",MYK(bx));
    if (getBMode(o)==OpArgU) printf(" %d",bx);
    break;
   case iAsBx:
    printf("%d %d",a,sbx);
    break;
   case iAx:
    printf("%d",MYK(ax));
    break;
  }
  switch (o)
  {
   case OP_LOADK:
    printf("\t; "); PrintConstant(f,bx);
    break;
   case OP_GETUPVAL:
   case OP_SETUPVAL:
    printf("\t; %s",UPVALNAME(b));
    break;
   case OP_GETTABUP:
    printf("\t; %s",UPVALNAME(b));
    if (ISK(c)) { printf(" "); PrintConstant(f,INDEXK(c)); }
    break;
   case OP_SETTABUP:
    printf("\t; %s",UPVALNAME(a));
    if (ISK(b)) { printf(" "); PrintConstant(f,INDEXK(b)); }
    if (ISK(c)) { printf(" "); PrintConstant(f,INDEXK(c)); }
    break;
   case OP_GETTABLE:
   case OP_SELF:
    if (ISK(c)) { printf("\t; "); PrintConstant(f,INDEXK(c)); }
    break;
   case OP_SETTABLE:
   case OP_ADD:
   case OP_SUB:
   case OP_MUL:
   case OP_MOD:
   case OP_POW:
   case OP_DIV:
   case OP_IDIV:
   case OP_BAND:
   case OP_BOR:
   case OP_BXOR:
   case OP_SHL:
   case OP_SHR:
   case OP_EQ:
   case OP_LT:
   case OP_LE:
    if (ISK(b) || ISK(c))
    {
     printf("\t; ");
     if (ISK(b)) PrintConstant(f,INDEXK(b)); else printf("-");
     printf(" ");
     if (ISK(c)) PrintConstant(f,INDEXK(c)); else printf("-");
    }
    break;
   case OP_JMP:
   case OP_FORLOOP:
   case OP_FORPREP:
   case OP_TFORLOOP:
    printf("\t; to %d",sbx+pc+2);
    break;
   case OP_CLOSURE:
    printf("\t; %p",VOID(f->p[bx]));
    break;
   case OP_SETLIST:
    if (c==0) printf("\t; %d",(int)code[++pc]); else printf("\t; %d",c);
    break;
   case OP_EXTRAARG:
    printf("\t; "); PrintConstant(f,ax);
    break;
   default:
    break;
  }
  printf("\n");
 }
}

#define SS(x)	((x==1)?"":"s")
#define S(x)	(int)(x),SS(x)

static void PrintHeader(const Proto* f)
{
 const char* s=f->source ? getstr(f->source) : "=?";
 if (*s=='@' || *s=='=')
  s++;
 else if (*s==LUA_SIGNATURE[0])
  s="(bstring)";
 else
  s="(string)";
 printf("\n%s <%s:%d,%d> (%d instruction%s at %p)\n",
 	(f->linedefined==0)?"main":"function",s,
	f->linedefined,f->lastlinedefined,
	S(f->sizecode),VOID(f));
 printf("%d%s param%s, %d slot%s, %d upvalue%s, ",
	(int)(f->numparams),f->is_vararg?"+":"",SS(f->numparams),
	S(f->maxstacksize),S(f->sizeupvalues));
 printf("%d local%s, %d constant%s, %d function%s\n",
	S(f->sizelocvars),S(f->sizek),S(f->sizep));
}

static void PrintDebug(const Proto* f)
{
 int i,n;
 n=f->sizek;
 printf("constants (%d) for %p:\n",n,VOID(f));
 for (i=0; i<n; i++)
 {
  printf("\t%d\t",i+1);
  PrintConstant(f,i);
  printf("\n");
 }
 n=f->sizelocvars;
 printf("locals (%d) for %p:\n",n,VOID(f));
 for (i=0; i<n; i++)
 {
  printf("\t%d\t%s\t%d\t%d\n",
  i,getstr(f->locvars[i].varname),f->locvars[i].startpc+1,f->locvars[i].endpc+1);
 }
 n=f->sizeupvalues;
 printf("upvalues (%d) for %p:\n",n,VOID(f));
 for (i=0; i<n; i++)
 {
  printf("\t%d\t%s\t%d\t%d\n",
  i,UPVALNAME(i),f->upvalues[i].instack,f->upvalues[i].idx);
 }
}

static void PrintFunction(const Proto* f, int full)
{
 int i,n=f->sizep;
 PrintHeader(f);
 PrintCode(f);
 if (full) PrintDebug(f);
 for (i=0; i<n; i++) PrintFunction(f->p[i],full);
}