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** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
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** load precompiled Lua chunks
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** See Copyright Notice in lua.h
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#ifdef LUAC_TRUST_BINARIES
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#define IF(c,s) if (c) error(S,s)
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static void error(LoadState* S, const char* why)
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luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
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luaD_throw(S->L,LUA_ERRSYNTAX);
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#define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
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#define LoadByte(S) (lu_byte)LoadChar(S)
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#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
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#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
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static void LoadBlock(LoadState* S, void* b, size_t size)
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size_t r=luaZ_read(S->Z,b,size);
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IF (r!=0, "unexpected end");
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static int LoadChar(LoadState* S)
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static int LoadInt(LoadState* S)
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IF (x<0, "bad integer");
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static lua_Number LoadNumber(LoadState* S)
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static TString* LoadString(LoadState* S)
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char* s=luaZ_openspace(S->L,S->b,size);
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return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
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static void LoadCode(LoadState* S, Proto* f)
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f->code=luaM_newvector(S->L,n,Instruction);
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LoadVector(S,f->code,n,sizeof(Instruction));
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static Proto* LoadFunction(LoadState* S, TString* p);
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static void LoadConstants(LoadState* S, Proto* f)
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f->k=luaM_newvector(S->L,n,TValue);
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for (i=0; i<n; i++) setnilvalue(&f->k[i]);
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setbvalue(o,LoadChar(S)!=0);
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setnvalue(o,LoadNumber(S));
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setsvalue2n(S->L,o,LoadString(S));
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error(S,"bad constant");
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f->p=luaM_newvector(S->L,n,Proto*);
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for (i=0; i<n; i++) f->p[i]=NULL;
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for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
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static void LoadDebug(LoadState* S, Proto* f)
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f->lineinfo=luaM_newvector(S->L,n,int);
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LoadVector(S,f->lineinfo,n,sizeof(int));
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f->locvars=luaM_newvector(S->L,n,LocVar);
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for (i=0; i<n; i++) f->locvars[i].varname=NULL;
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f->locvars[i].varname=LoadString(S);
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f->locvars[i].startpc=LoadInt(S);
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f->locvars[i].endpc=LoadInt(S);
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f->upvalues=luaM_newvector(S->L,n,TString*);
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for (i=0; i<n; i++) f->upvalues[i]=NULL;
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for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
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static Proto* LoadFunction(LoadState* S, TString* p)
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if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
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f=luaF_newproto(S->L);
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setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
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f->source=LoadString(S); if (f->source==NULL) f->source=p;
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f->linedefined=LoadInt(S);
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f->lastlinedefined=LoadInt(S);
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f->numparams=LoadByte(S);
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f->is_vararg=LoadByte(S);
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f->maxstacksize=LoadByte(S);
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IF (!luaG_checkcode(f), "bad code");
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static void LoadHeader(LoadState* S)
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char h[LUAC_HEADERSIZE];
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char s[LUAC_HEADERSIZE];
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LoadBlock(S,s,LUAC_HEADERSIZE);
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IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
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** load precompiled chunk
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Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
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if (*name=='@' || *name=='=')
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else if (*name==LUA_SIGNATURE[0])
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S.name="binary string";
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return LoadFunction(&S,luaS_newliteral(L,"=?"));
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void luaU_header (char* h)
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memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
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h+=sizeof(LUA_SIGNATURE)-1;
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*h++=(char)LUAC_VERSION;
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*h++=(char)LUAC_FORMAT;
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*h++=(char)*(char*)&x; /* endianness */
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*h++=(char)sizeof(int);
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*h++=(char)sizeof(size_t);
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*h++=(char)sizeof(Instruction);
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*h++=(char)sizeof(lua_Number);
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*h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */