/*

** $Id: ldump.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $

** 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 DumpMem(b,n,size,D)	DumpBlock(b,(n)*(size),D)

#define DumpVar(x,D)	 	DumpMem(&x,1,sizeof(x),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 DumpChar(int y, DumpState* D)

{

 char x=(char)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 DumpVector(const void* b, int n, size_t size, DumpState* D)

{

 DumpInt(n,D);

 DumpMem(b,n,size,D);

}

static void DumpString(const TString* s, DumpState* D)

{

 if (s==NULL || getstr(s)==NULL)

 {

  size_t size=0;

  DumpVar(size,D);

 }

 else

 {

  size_t size=s->tsv.len+1;		/* include trailing '\0' */

  DumpVar(size,D);

  DumpBlock(getstr(s),size,D);

 }

}

#define DumpCode(f,D)	 DumpVector(f->code,f->sizecode,sizeof(Instruction),D)

static void DumpFunction(const Proto* f, const TString* p, 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];

  DumpChar(ttype(o),D);

  switch (ttype(o))

  {

   case LUA_TNIL:

	break;

   case LUA_TBOOLEAN:

	DumpChar(bvalue(o),D);

	break;

   case LUA_TNUMBER:

	DumpNumber(nvalue(o),D);

	break;

   case LUA_TSTRING:

	DumpString(rawtsvalue(o),D);

	break;

   default:

	lua_assert(0);			/* cannot happen */

	break;

  }

 }

 n=f->sizep;

 DumpInt(n,D);

 for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);

}

static void DumpDebug(const Proto* f, DumpState* D)

{

 int i,n;

 n= (D->strip) ? 0 : f->sizelineinfo;

 DumpVector(f->lineinfo,n,sizeof(int),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],D);

}

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

{

 DumpString((f->source==p || D->strip) ? NULL : f->source,D);

 DumpInt(f->linedefined,D);

 DumpInt(f->lastlinedefined,D);

 DumpChar(f->nups,D);

 DumpChar(f->numparams,D);

 DumpChar(f->is_vararg,D);

 DumpChar(f->maxstacksize,D);

 DumpCode(f,D);

 DumpConstants(f,D);

 DumpDebug(f,D);

}

static void DumpHeader(DumpState* D)

{

 char h[LUAC_HEADERSIZE];

 luaU_header(h);

 DumpBlock(h,LUAC_HEADERSIZE,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);

 DumpFunction(f,NULL,&D);

 return D.status;

}