1 /*

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

     3 ** save precompiled Lua chunks

     4 ** See Copyright Notice in lua.h

     5 */

     6 

     7 #include <stddef.h>

     8 

     9 #define ldump_c

    10 #define LUA_CORE

    11 

    12 #include "lua.h"

    13 

    14 #include "lobject.h"

    15 #include "lstate.h"

    16 #include "lundump.h"

    17 

    18 typedef struct {

    19  lua_State* L;

    20  lua_Writer writer;

    21  void* data;

    22  int strip;

    23  int status;

    24 } DumpState;

    25 

    26 #define DumpMem(b,n,size,D)	DumpBlock(b,(n)*(size),D)

    27 #define DumpVar(x,D)	 	DumpMem(&x,1,sizeof(x),D)

    28 

    29 static void DumpBlock(const void* b, size_t size, DumpState* D)

    30 {

    31  if (D->status==0)

    32  {

    33   lua_unlock(D->L);

    34   D->status=(*D->writer)(D->L,b,size,D->data);

    35   lua_lock(D->L);

    36  }

    37 }

    38 

    39 static void DumpChar(int y, DumpState* D)

    40 {

    41  char x=(char)y;

    42  DumpVar(x,D);

    43 }

    44 

    45 static void DumpInt(int x, DumpState* D)

    46 {

    47  DumpVar(x,D);

    48 }

    49 

    50 static void DumpNumber(lua_Number x, DumpState* D)

    51 {

    52  DumpVar(x,D);

    53 }

    54 

    55 static void DumpVector(const void* b, int n, size_t size, DumpState* D)

    56 {

    57  DumpInt(n,D);

    58  DumpMem(b,n,size,D);

    59 }

    60 

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

    62 {

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

    64  {

    65   size_t size=0;

    66   DumpVar(size,D);

    67  }

    68  else

    69  {

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

    71   DumpVar(size,D);

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

    73  }

    74 }

    75 

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

    77 

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

    79 

    80 static void DumpConstants(const Proto* f, DumpState* D)

    81 {

    82  int i,n=f->sizek;

    83  DumpInt(n,D);

    84  for (i=0; i<n; i++)

    85  {

    86   const TValue* o=&f->k[i];

    87   DumpChar(ttype(o),D);

    88   switch (ttype(o))

    89   {

    90    case LUA_TNIL:

    91 	break;

    92    case LUA_TBOOLEAN:

    93 	DumpChar(bvalue(o),D);

    94 	break;

    95    case LUA_TNUMBER:

    96 	DumpNumber(nvalue(o),D);

    97 	break;

    98    case LUA_TSTRING:

    99 	DumpString(rawtsvalue(o),D);

   100 	break;

   101    default:

   102 	lua_assert(0);			/* cannot happen */

   103 	break;

   104   }

   105  }

   106  n=f->sizep;

   107  DumpInt(n,D);

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

   109 }

   110 

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

   112 {

   113  int i,n;

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

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

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

   117  DumpInt(n,D);

   118  for (i=0; i<n; i++)

   119  {

   120   DumpString(f->locvars[i].varname,D);

   121   DumpInt(f->locvars[i].startpc,D);

   122   DumpInt(f->locvars[i].endpc,D);

   123  }

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

   125  DumpInt(n,D);

   126  for (i=0; i<n; i++) DumpString(f->upvalues[i],D);

   127 }

   128 

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

   130 {

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

   132  DumpInt(f->linedefined,D);

   133  DumpInt(f->lastlinedefined,D);

   134  DumpChar(f->nups,D);

   135  DumpChar(f->numparams,D);

   136  DumpChar(f->is_vararg,D);

   137  DumpChar(f->maxstacksize,D);

   138  DumpCode(f,D);

   139  DumpConstants(f,D);

   140  DumpDebug(f,D);

   141 }

   142 

   143 static void DumpHeader(DumpState* D)

   144 {

   145  char h[LUAC_HEADERSIZE];

   146  luaU_header(h);

   147  DumpBlock(h,LUAC_HEADERSIZE,D);

   148 }

   149 

   150 /*

   151 ** dump Lua function as precompiled chunk

   152 */

   153 int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip)

   154 {

   155  DumpState D;

   156  D.L=L;

   157  D.writer=w;

   158  D.data=data;

   159  D.strip=strip;

   160  D.status=0;

   161  DumpHeader(&D);

   162  DumpFunction(f,NULL,&D);

   163  return D.status;

   164 }