/*
** $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
*/

#define LUAC_CROSS_FILE

#include "luac_cross.h"
#include C_HEADER_ERRNO
#include C_HEADER_STDIO
#include C_HEADER_STDLIB
#include C_HEADER_STRING
#include <time.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 int flash=0;	  		/* output flash image */
static int lookup=0;	  		/* output lookup-style master combination header */
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 DumpTargetInfo target;

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


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"
 "  -f       output a flash image file\n"
 "  -i       generate lookup combination master (default with option -f)\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("-f"))			/* Flash image file */
  {
   flash=1;
   lookup=1;
  }
  else if (IS("-i"))			/* lookup */
   lookup = 1;
  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 TString *corename(lua_State *L, const TString *filename) 
{
 const char *fn = getstr(filename)+1;
 const char *s = strrchr(fn, '/');
 s = s ? s + 1 : fn;
 while (*s == '.') s++;
 const char *e = strchr(s, '.');
 int l = e ? e - s: strlen(s);
 return l ? luaS_newlstr (L, s, l) : luaS_new(L, fn);
} 
/*
 * 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 facilitates indexing into the gernated protos 
 */
static const Proto* combine(lua_State* L, int n, int type)
{
 if (n==1 && type == 0)
  return toproto(L,-1);
 else
 {
  int i,pc,stacksize;
  Instruction *code;
  Proto* f=luaF_newproto(L);
  setptvalue2s(L,L->top,f); incr_top(L);
  f->source=luaS_newliteral(L,"=(" PROGNAME ")");
  f->p=luaM_newvector(L,n,Proto*);
  f->sizep=n;
  for (i=0; i<n; i++) f->p[i]=toproto(L,i-n-1);
  pc=0;

  if (type == 0)
  {
  /*
   * Type 0 is as per the standard luac, which is just a main routine which 
   * invokes all of the compiled functions sequentially.  This is fine if 
   * they are self registering modules, but useless otherwise.
   */
   stacksize = 1;
   code=luaM_newvector(L,2*n+1,Instruction);
   for (i=0; i<n; i++)
   {
    code[pc++]=CREATE_ABx(OP_CLOSURE,0,i);
    code[pc++]=CREATE_ABC(OP_CALL,0,1,1);
   }
   code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
  }
  else
  {
  /*
   * The Type 1 main() is a lookup which takes a single argument, the name to  
   * be resolved. If this matches root name of one of the compiled files then
   * a closure to this file main is returned.  If the name is "list": then the
   * list of root names is returned, else a nil return.
   */
   lua_assert(n<LFIELDS_PER_FLUSH);
   stacksize = n+2;
   code=luaM_newvector(L,5*n+3  ,Instruction);
   f->k=luaM_newvector(L,n+1,TValue);
   f->sizek=n+1;
   setnvalue(f->k, (lua_Number) time(NULL));
   for (i=0; i<n; i++)  
   {
    /* if arg1 == FnameA then return function (...) -- funcA -- end end */
    setsvalue2n(L,f->k+i+1,corename(L, f->p[i]->source));
    code[pc++]=CREATE_ABC(OP_EQ,0,0,RKASK(i+1)); 
    code[pc++]=CREATE_ABx(OP_JMP,0,MAXARG_sBx+2);
    code[pc++]=CREATE_ABx(OP_CLOSURE,1,i);
    code[pc++]=CREATE_ABC(OP_RETURN,1,2,0);
   }
   for (i=0; i<=n; i++) code[pc++]=CREATE_ABx(OP_LOADK,i+1,i);
   /* should be a block loop */
   code[pc++]=CREATE_ABC(OP_RETURN,1,2+n,0);
   code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
  }
  f->numparams=1;
  f->maxstacksize=stacksize;
  f->code=code;
  f->sizecode=pc;
  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;
};

extern uint dumpToFlashImage (lua_State* L,const Proto *main, lua_Writer w, void* data, int strip);

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,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) 
  {
    result=dumpToFlashImage(L,f,writer, D, stripping);
  } else
  {
    result=luaU_dump_crosscompile(L,f,writer,D,stripping,target);
  }  
  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;
 struct Smain s;
 
 int test=1;
 target.little_endian=*(char*)&test;
 target.sizeof_int=sizeof(int);
 target.sizeof_strsize_t=sizeof(strsize_t);
 target.sizeof_lua_Number=sizeof(lua_Number);
 target.lua_Number_integral=(((lua_Number)0.5)==0);
 target.is_arm_fpa=0;

 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;
}