2 ** $Id: lundump.c,v 2.22.1.1 2013/04/12 18:48:47 roberto Exp $
3 ** load precompiled Lua chunks
4 ** See Copyright Notice in lua.h
30 static l_noret error(LoadState* S, const char* why)
32 luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why);
33 luaD_throw(S->L,LUA_ERRSYNTAX);
36 #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
37 #define LoadByte(S) (lu_byte)LoadChar(S)
38 #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
39 #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
41 #if !defined(luai_verifycode)
42 #define luai_verifycode(L,b,f) /* empty */
45 static void LoadBlock(LoadState* S, void* b, size_t size)
47 if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated");
50 static int LoadChar(LoadState* S)
57 static int LoadInt(LoadState* S)
61 if (x<0) error(S,"corrupted");
65 static lua_Number LoadNumber(LoadState* S)
72 static TString* LoadString(LoadState* S)
80 char* s=luaZ_openspace(S->L,S->b,size);
81 LoadBlock(S,s,size*sizeof(char));
82 return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
86 static void LoadCode(LoadState* S, Proto* f)
89 f->code=luaM_newvector(S->L,n,Instruction);
91 LoadVector(S,f->code,n,sizeof(Instruction));
94 static void LoadFunction(LoadState* S, Proto* f);
96 static void LoadConstants(LoadState* S, Proto* f)
100 f->k=luaM_newvector(S->L,n,TValue);
102 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
113 setbvalue(o,LoadChar(S));
116 setnvalue(o,LoadNumber(S));
119 setsvalue2n(S->L,o,LoadString(S));
121 default: lua_assert(0);
125 f->p=luaM_newvector(S->L,n,Proto*);
127 for (i=0; i<n; i++) f->p[i]=NULL;
130 f->p[i]=luaF_newproto(S->L);
131 LoadFunction(S,f->p[i]);
135 static void LoadUpvalues(LoadState* S, Proto* f)
139 f->upvalues=luaM_newvector(S->L,n,Upvaldesc);
141 for (i=0; i<n; i++) f->upvalues[i].name=NULL;
144 f->upvalues[i].instack=LoadByte(S);
145 f->upvalues[i].idx=LoadByte(S);
149 static void LoadDebug(LoadState* S, Proto* f)
152 f->source=LoadString(S);
154 f->lineinfo=luaM_newvector(S->L,n,int);
156 LoadVector(S,f->lineinfo,n,sizeof(int));
158 f->locvars=luaM_newvector(S->L,n,LocVar);
160 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
163 f->locvars[i].varname=LoadString(S);
164 f->locvars[i].startpc=LoadInt(S);
165 f->locvars[i].endpc=LoadInt(S);
168 for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S);
171 static void LoadFunction(LoadState* S, Proto* f)
173 f->linedefined=LoadInt(S);
174 f->lastlinedefined=LoadInt(S);
175 f->numparams=LoadByte(S);
176 f->is_vararg=LoadByte(S);
177 f->maxstacksize=LoadByte(S);
184 /* the code below must be consistent with the code in luaU_header */
185 #define N0 LUAC_HEADERSIZE
186 #define N1 (sizeof(LUA_SIGNATURE)-sizeof(char))
190 static void LoadHeader(LoadState* S)
192 lu_byte h[LUAC_HEADERSIZE];
193 lu_byte s[LUAC_HEADERSIZE];
195 memcpy(s,h,sizeof(char)); /* first char already read */
196 LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char));
197 if (memcmp(h,s,N0)==0) return;
198 if (memcmp(h,s,N1)!=0) error(S,"not a");
199 if (memcmp(h,s,N2)!=0) error(S,"version mismatch in");
200 if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted");
204 ** load precompiled chunk
206 Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
210 if (*name=='@' || *name=='=')
212 else if (*name==LUA_SIGNATURE[0])
213 S.name="binary string";
220 cl=luaF_newLclosure(L,1);
221 setclLvalue(L,L->top,cl); incr_top(L);
222 cl->l.p=luaF_newproto(L);
223 LoadFunction(&S,cl->l.p);
224 if (cl->l.p->sizeupvalues != 1)
227 cl=luaF_newLclosure(L,cl->l.p->sizeupvalues);
229 setclLvalue(L,L->top-1,cl);
231 luai_verifycode(L,buff,cl->l.p);
235 #define MYINT(s) (s[0]-'0')
236 #define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR)
237 #define FORMAT 0 /* this is the official format */
240 * make header for precompiled chunks
241 * if you change the code below be sure to update LoadHeader and FORMAT above
242 * and LUAC_HEADERSIZE in lundump.h
244 void luaU_header (lu_byte* h)
247 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char));
248 h+=sizeof(LUA_SIGNATURE)-sizeof(char);
249 *h++=cast_byte(VERSION);
250 *h++=cast_byte(FORMAT);
251 *h++=cast_byte(*(char*)&x); /* endianness */
252 *h++=cast_byte(sizeof(int));
253 *h++=cast_byte(sizeof(size_t));
254 *h++=cast_byte(sizeof(Instruction));
255 *h++=cast_byte(sizeof(lua_Number));
256 *h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */
257 memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char));