/*
** $Id: ldump.c,v 2.23 2014/02/28 16:13:01 roberto Exp roberto $
** save precompiled Lua chunks
** See Copyright Notice in lua.h
*/

#include <stddef.h>

#define ldump_c
#define LUA_CORE

#include "lua.h"

#include "lobject.h"
#include "lstate.h"
#include "lundump.h"

typedef struct {
 lua_State* L;
 lua_Writer writer;
 void* data;
 int strip;
 int status;
} DumpState;


#define DumpVar(x,D)		DumpBlock(&x,sizeof(x),D)
#define DumpVector(v,n,D)	DumpBlock(v,(n)*sizeof((v)[0]),D)

static void DumpBlock(const void* b, size_t size, DumpState* D)
{
 if (D->status==0)
 {
  lua_unlock(D->L);
  D->status=(*D->writer)(D->L,b,size,D->data);
  lua_lock(D->L);
 }
}

static void DumpByte(int y, DumpState* D)
{
 lu_byte x=(lu_byte)y;
 DumpVar(x,D);
}

static void DumpInt(int x, DumpState* D)
{
 DumpVar(x,D);
}

static void DumpNumber(lua_Number x, DumpState* D)
{
 DumpVar(x,D);
}

static void DumpInteger(lua_Integer x, DumpState* D)
{
 DumpVar(x,D);
}

static void DumpString(const TString* s, DumpState* D)
{
 if (s==NULL) DumpByte(0,D);
 else {
  size_t size = s->tsv.len+1;  /* include trailing '\0' */
  if (size < 0xFF) DumpByte(size,D);
  else
  {
   DumpByte(0xFF,D);
   DumpVar(size,D);
  }
  DumpVector(getstr(s),size-1,D);  /* no need to save '\0' */
 }
}

static void DumpCode(const Proto* f, DumpState* D)
{
 DumpInt(f->sizecode,D);
 DumpVector(f->code,f->sizecode,D);
}

static void DumpFunction(const Proto* f, DumpState* D);

static void DumpConstants(const Proto* f, DumpState* D)
{
 int i,n=f->sizek;
 DumpInt(n,D);
 for (i=0; i<n; i++)
 {
  const TValue* o=&f->k[i];
  DumpByte(ttype(o),D);
  switch (ttype(o))
  {
   case LUA_TNIL:
	break;
   case LUA_TBOOLEAN:
	DumpByte(bvalue(o),D);
	break;
   case LUA_TNUMFLT:
	DumpNumber(fltvalue(o),D);
	break;
   case LUA_TNUMINT:
	DumpInteger(ivalue(o),D);
	break;
   case LUA_TSHRSTR: case LUA_TLNGSTR:
	DumpString(rawtsvalue(o),D);
	break;
    default: lua_assert(0);
  }
 }
 n=f->sizep;
 DumpInt(n,D);
 for (i=0; i<n; i++) DumpFunction(f->p[i],D);
}

static void DumpUpvalues(const Proto* f, DumpState* D)
{
 int i,n=f->sizeupvalues;
 DumpInt(n,D);
 for (i=0; i<n; i++)
 {
  DumpByte(f->upvalues[i].instack,D);
  DumpByte(f->upvalues[i].idx,D);
 }
}

static void DumpDebug(const Proto* f, DumpState* D)
{
 int i,n;
 DumpString((D->strip) ? NULL : f->source,D);
 n= (D->strip) ? 0 : f->sizelineinfo;
 DumpInt(n,D);
 DumpVector(f->lineinfo,n,D);
 n= (D->strip) ? 0 : f->sizelocvars;
 DumpInt(n,D);
 for (i=0; i<n; i++)
 {
  DumpString(f->locvars[i].varname,D);
  DumpInt(f->locvars[i].startpc,D);
  DumpInt(f->locvars[i].endpc,D);
 }
 n= (D->strip) ? 0 : f->sizeupvalues;
 DumpInt(n,D);
 for (i=0; i<n; i++) DumpString(f->upvalues[i].name,D);
}

static void DumpFunction(const Proto* f, DumpState* D)
{
 DumpInt(f->linedefined,D);
 DumpInt(f->lastlinedefined,D);
 DumpByte(f->numparams,D);
 DumpByte(f->is_vararg,D);
 DumpByte(f->maxstacksize,D);
 DumpCode(f,D);
 DumpConstants(f,D);
 DumpUpvalues(f,D);
 DumpDebug(f,D);
}

static void DumpHeader(DumpState* D)
{
 DumpBlock(LUA_SIGNATURE,sizeof(LUA_SIGNATURE),D);
 DumpBlock(LUAC_DATA,sizeof(LUAC_DATA),D);
 DumpByte(LUAC_VERSION,D);
 DumpByte(LUAC_FORMAT,D);
 DumpByte(sizeof(int),D);
 DumpByte(sizeof(size_t),D);
 DumpByte(sizeof(Instruction),D);
 DumpByte(sizeof(lua_Integer),D);
 DumpByte(sizeof(lua_Number),D);
 DumpInteger(LUAC_INT,D);
 DumpNumber(LUAC_NUM,D);
}

/*
** dump Lua function as precompiled chunk
*/
int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip)
{
 DumpState D;
 D.L=L;
 D.writer=w;
 D.data=data;
 D.strip=strip;
 D.status=0;
 DumpHeader(&D);
 DumpByte(f->sizeupvalues,&D);
 DumpFunction(f,&D);
 return D.status;
}