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lua/lundump.c

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00001 /*
00002 ** $Id: lundump.c,v 1.60 2006/02/16 15:53:49 lhf Exp $
00003 ** load precompiled Lua chunks
00004 ** See Copyright Notice in lua.h
00005 */
00006 
00007 #include <string.h>
00008 
00009 #define lundump_c
00010 #define LUA_CORE
00011 
00012 #include "lua.h"
00013 
00014 #include "ldebug.h"
00015 #include "ldo.h"
00016 #include "lfunc.h"
00017 #include "lmem.h"
00018 #include "lobject.h"
00019 #include "lstring.h"
00020 #include "lundump.h"
00021 #include "lzio.h"
00022 
00023 typedef struct {
00024  lua_State* L;
00025  ZIO* Z;
00026  Mbuffer* b;
00027  const char* name;
00028 } LoadState;
00029 
00030 #ifdef LUAC_TRUST_BINARIES
00031 #define IF(c,s)
00032 #else
00033 #define IF(c,s)         if (c) error(S,s)
00034 
00035 static void error(LoadState* S, const char* why)
00036 {
00037  luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
00038  luaD_throw(S->L,LUA_ERRSYNTAX);
00039 }
00040 #endif
00041 
00042 #define LoadMem(S,b,n,size)     LoadBlock(S,b,(n)*(size))
00043 #define LoadByte(S)             (lu_byte)LoadChar(S)
00044 #define LoadVar(S,x)            LoadMem(S,&x,1,sizeof(x))
00045 #define LoadVector(S,b,n,size)  LoadMem(S,b,n,size)
00046 
00047 static void LoadBlock(LoadState* S, void* b, size_t size)
00048 {
00049  size_t r=luaZ_read(S->Z,b,size);
00050  IF (r!=0, "unexpected end");
00051 }
00052 
00053 static int LoadChar(LoadState* S)
00054 {
00055  char x;
00056  LoadVar(S,x);
00057  return x;
00058 }
00059 
00060 static int LoadInt(LoadState* S)
00061 {
00062  int x;
00063  LoadVar(S,x);
00064  IF (x<0, "bad integer");
00065  return x;
00066 }
00067 
00068 static lua_Number LoadNumber(LoadState* S)
00069 {
00070  lua_Number x;
00071  LoadVar(S,x);
00072  return x;
00073 }
00074 
00075 static TString* LoadString(LoadState* S)
00076 {
00077  size_t size;
00078  LoadVar(S,size);
00079  if (size==0)
00080   return NULL;
00081  else
00082  {
00083   char* s=luaZ_openspace(S->L,S->b,size);
00084   LoadBlock(S,s,size);
00085   return luaS_newlstr(S->L,s,size-1);           /* remove trailing '\0' */
00086  }
00087 }
00088 
00089 static void LoadCode(LoadState* S, Proto* f)
00090 {
00091  int n=LoadInt(S);
00092  f->code=luaM_newvector(S->L,n,Instruction);
00093  f->sizecode=n;
00094  LoadVector(S,f->code,n,sizeof(Instruction));
00095 }
00096 
00097 static Proto* LoadFunction(LoadState* S, TString* p);
00098 
00099 static void LoadConstants(LoadState* S, Proto* f)
00100 {
00101  int i,n;
00102  n=LoadInt(S);
00103  f->k=luaM_newvector(S->L,n,TValue);
00104  f->sizek=n;
00105  for (i=0; i<n; i++) setnilvalue(&f->k[i]);
00106  for (i=0; i<n; i++)
00107  {
00108   TValue* o=&f->k[i];
00109   int t=LoadChar(S);
00110   switch (t)
00111   {
00112    case LUA_TNIL:
00113         setnilvalue(o);
00114         break;
00115    case LUA_TBOOLEAN:
00116         setbvalue(o,LoadChar(S));
00117         break;
00118    case LUA_TNUMBER:
00119         setnvalue(o,LoadNumber(S));
00120         break;
00121    case LUA_TSTRING:
00122         setsvalue2n(S->L,o,LoadString(S));
00123         break;
00124    default:
00125         IF (1, "bad constant");
00126         break;
00127   }
00128  }
00129  n=LoadInt(S);
00130  f->p=luaM_newvector(S->L,n,Proto*);
00131  f->sizep=n;
00132  for (i=0; i<n; i++) f->p[i]=NULL;
00133  for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
00134 }
00135 
00136 static void LoadDebug(LoadState* S, Proto* f)
00137 {
00138  int i,n;
00139  n=LoadInt(S);
00140  f->lineinfo=luaM_newvector(S->L,n,int);
00141  f->sizelineinfo=n;
00142  LoadVector(S,f->lineinfo,n,sizeof(int));
00143  n=LoadInt(S);
00144  f->locvars=luaM_newvector(S->L,n,LocVar);
00145  f->sizelocvars=n;
00146  for (i=0; i<n; i++) f->locvars[i].varname=NULL;
00147  for (i=0; i<n; i++)
00148  {
00149   f->locvars[i].varname=LoadString(S);
00150   f->locvars[i].startpc=LoadInt(S);
00151   f->locvars[i].endpc=LoadInt(S);
00152  }
00153  n=LoadInt(S);
00154  f->upvalues=luaM_newvector(S->L,n,TString*);
00155  f->sizeupvalues=n;
00156  for (i=0; i<n; i++) f->upvalues[i]=NULL;
00157  for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
00158 }
00159 
00160 static Proto* LoadFunction(LoadState* S, TString* p)
00161 {
00162  Proto* f=luaF_newproto(S->L);
00163  setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
00164  f->source=LoadString(S); if (f->source==NULL) f->source=p;
00165  f->linedefined=LoadInt(S);
00166  f->lastlinedefined=LoadInt(S);
00167  f->nups=LoadByte(S);
00168  f->numparams=LoadByte(S);
00169  f->is_vararg=LoadByte(S);
00170  f->maxstacksize=LoadByte(S);
00171  LoadCode(S,f);
00172  LoadConstants(S,f);
00173  LoadDebug(S,f);
00174  IF (!luaG_checkcode(f), "bad code");
00175  S->L->top--;
00176  return f;
00177 }
00178 
00179 static void LoadHeader(LoadState* S)
00180 {
00181  char h[LUAC_HEADERSIZE];
00182  char s[LUAC_HEADERSIZE];
00183  luaU_header(h);
00184  LoadBlock(S,s,LUAC_HEADERSIZE);
00185  IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
00186 }
00187 
00188 /*
00189 ** load precompiled chunk
00190 */
00191 Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
00192 {
00193  LoadState S;
00194  if (*name=='@' || *name=='=')
00195   S.name=name+1;
00196  else if (*name==LUA_SIGNATURE[0])
00197   S.name="binary string";
00198  else
00199   S.name=name;
00200  S.L=L;
00201  S.Z=Z;
00202  S.b=buff;
00203  LoadHeader(&S);
00204  return LoadFunction(&S,luaS_newliteral(L,"=?"));
00205 }
00206 
00207 /*
00208 * make header
00209 */
00210 void luaU_header (char* h)
00211 {
00212  int x=1;
00213  memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
00214  h+=sizeof(LUA_SIGNATURE)-1;
00215  *h++=(char)LUAC_VERSION;
00216  *h++=(char)LUAC_FORMAT;
00217  *h++=(char)*(char*)&x;                         /* endianness */
00218  *h++=(char)sizeof(int);
00219  *h++=(char)sizeof(size_t);
00220  *h++=(char)sizeof(Instruction);
00221  *h++=(char)sizeof(lua_Number);
00222  *h++=(char)(((lua_Number)0.5)==0);             /* is lua_Number integral? */
00223 }

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