2 ** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
3 ** load precompiled Lua chunks
4 ** See Copyright Notice in lua.h
30 #ifdef LUAC_TRUST_BINARIES
34 #define IF(c,s) if (c) error(S,s)
36 static void error(LoadState* S, const char* why)
38 luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
39 luaD_throw(S->L,LUA_ERRSYNTAX);
43 #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
44 #define LoadByte(S) (lu_byte)LoadChar(S)
45 #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
46 #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
48 static void LoadBlock(LoadState* S, void* b, size_t size)
50 size_t r=luaZ_read(S->Z,b,size);
51 IF (r!=0, "unexpected end");
54 static int LoadChar(LoadState* S)
61 static int LoadInt(LoadState* S)
65 IF (x<0, "bad integer");
69 static lua_Number LoadNumber(LoadState* S)
76 static TString* LoadString(LoadState* S)
84 char* s=luaZ_openspace(S->L,S->b,size);
86 return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
90 static void LoadCode(LoadState* S, Proto* f)
93 f->code=luaM_newvector(S->L,n,Instruction);
95 LoadVector(S,f->code,n,sizeof(Instruction));
98 static Proto* LoadFunction(LoadState* S, TString* p);
100 static void LoadConstants(LoadState* S, Proto* f)
104 f->k=luaM_newvector(S->L,n,TValue);
106 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
117 setbvalue(o,LoadChar(S)!=0);
120 setnvalue(o,LoadNumber(S));
123 setsvalue2n(S->L,o,LoadString(S));
126 error(S,"bad constant");
131 f->p=luaM_newvector(S->L,n,Proto*);
133 for (i=0; i<n; i++) f->p[i]=NULL;
134 for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
137 static void LoadDebug(LoadState* S, Proto* f)
141 f->lineinfo=luaM_newvector(S->L,n,int);
143 LoadVector(S,f->lineinfo,n,sizeof(int));
145 f->locvars=luaM_newvector(S->L,n,LocVar);
147 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
150 f->locvars[i].varname=LoadString(S);
151 f->locvars[i].startpc=LoadInt(S);
152 f->locvars[i].endpc=LoadInt(S);
155 f->upvalues=luaM_newvector(S->L,n,TString*);
157 for (i=0; i<n; i++) f->upvalues[i]=NULL;
158 for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
161 static Proto* LoadFunction(LoadState* S, TString* p)
164 if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
165 f=luaF_newproto(S->L);
166 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
167 f->source=LoadString(S); if (f->source==NULL) f->source=p;
168 f->linedefined=LoadInt(S);
169 f->lastlinedefined=LoadInt(S);
171 f->numparams=LoadByte(S);
172 f->is_vararg=LoadByte(S);
173 f->maxstacksize=LoadByte(S);
177 IF (!luaG_checkcode(f), "bad code");
183 static void LoadHeader(LoadState* S)
185 char h[LUAC_HEADERSIZE];
186 char s[LUAC_HEADERSIZE];
188 LoadBlock(S,s,LUAC_HEADERSIZE);
189 IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
193 ** load precompiled chunk
195 Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
198 if (*name=='@' || *name=='=')
200 else if (*name==LUA_SIGNATURE[0])
201 S.name="binary string";
208 return LoadFunction(&S,luaS_newliteral(L,"=?"));
214 void luaU_header (char* h)
217 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
218 h+=sizeof(LUA_SIGNATURE)-1;
219 *h++=(char)LUAC_VERSION;
220 *h++=(char)LUAC_FORMAT;
221 *h++=(char)*(char*)&x; /* endianness */
222 *h++=(char)sizeof(int);
223 *h++=(char)sizeof(size_t);
224 *h++=(char)sizeof(Instruction);
225 *h++=(char)sizeof(lua_Number);
226 *h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */