| 1 | /* |
| 2 | ** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 roberto Exp $ |
| 3 | ** load precompiled Lua chunks |
| 4 | ** See Copyright Notice in lua.h |
| 5 | */ |
| 6 | |
| 7 | #include <string.h> |
| 8 | |
| 9 | #define lundump_c |
| 10 | #define LUA_CORE |
| 11 | |
| 12 | #include "lua.h" |
| 13 | |
| 14 | #include "ldebug.h" |
| 15 | #include "ldo.h" |
| 16 | #include "lfunc.h" |
| 17 | #include "lmem.h" |
| 18 | #include "lobject.h" |
| 19 | #include "lstring.h" |
| 20 | #include "lundump.h" |
| 21 | #include "lzio.h" |
| 22 | |
| 23 | typedef struct { |
| 24 | lua_State* L; |
| 25 | ZIO* Z; |
| 26 | Mbuffer* b; |
| 27 | const char* name; |
| 28 | } LoadState; |
| 29 | |
| 30 | static l_noret error(LoadState* S, const char* why) |
| 31 | { |
| 32 | luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why); |
| 33 | luaD_throw(S->L,LUA_ERRSYNTAX); |
| 34 | } |
| 35 | |
| 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) |
| 40 | |
| 41 | #if !defined(luai_verifycode) |
| 42 | #define luai_verifycode(L,b,f) /* empty */ |
| 43 | #endif |
| 44 | |
| 45 | static void LoadBlock(LoadState* S, void* b, size_t size) |
| 46 | { |
| 47 | if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated"); |
| 48 | } |
| 49 | |
| 50 | static int LoadChar(LoadState* S) |
| 51 | { |
| 52 | char x; |
| 53 | LoadVar(S,x); |
| 54 | return x; |
| 55 | } |
| 56 | |
| 57 | static int LoadInt(LoadState* S) |
| 58 | { |
| 59 | int x; |
| 60 | LoadVar(S,x); |
| 61 | if (x<0) error(S,"corrupted"); |
| 62 | return x; |
| 63 | } |
| 64 | |
| 65 | static lua_Number LoadNumber(LoadState* S) |
| 66 | { |
| 67 | lua_Number x; |
| 68 | LoadVar(S,x); |
| 69 | return x; |
| 70 | } |
| 71 | |
| 72 | static TString* LoadString(LoadState* S) |
| 73 | { |
| 74 | size_t size; |
| 75 | LoadVar(S,size); |
| 76 | if (size==0) |
| 77 | return NULL; |
| 78 | else |
| 79 | { |
| 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' */ |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static void LoadCode(LoadState* S, Proto* f) |
| 87 | { |
| 88 | int n=LoadInt(S); |
| 89 | f->code=luaM_newvector(S->L,n,Instruction); |
| 90 | f->sizecode=n; |
| 91 | LoadVector(S,f->code,n,sizeof(Instruction)); |
| 92 | } |
| 93 | |
| 94 | static void LoadFunction(LoadState* S, Proto* f); |
| 95 | |
| 96 | static void LoadConstants(LoadState* S, Proto* f) |
| 97 | { |
| 98 | int i,n; |
| 99 | n=LoadInt(S); |
| 100 | f->k=luaM_newvector(S->L,n,TValue); |
| 101 | f->sizek=n; |
| 102 | for (i=0; i<n; i++) setnilvalue(&f->k[i]); |
| 103 | for (i=0; i<n; i++) |
| 104 | { |
| 105 | TValue* o=&f->k[i]; |
| 106 | int t=LoadChar(S); |
| 107 | switch (t) |
| 108 | { |
| 109 | case LUA_TNIL: |
| 110 | setnilvalue(o); |
| 111 | break; |
| 112 | case LUA_TBOOLEAN: |
| 113 | setbvalue(o,LoadChar(S)); |
| 114 | break; |
| 115 | case LUA_TNUMBER: |
| 116 | setnvalue(o,LoadNumber(S)); |
| 117 | break; |
| 118 | case LUA_TSTRING: |
| 119 | setsvalue2n(S->L,o,LoadString(S)); |
| 120 | break; |
| 121 | default: lua_assert(0); |
| 122 | } |
| 123 | } |
| 124 | n=LoadInt(S); |
| 125 | f->p=luaM_newvector(S->L,n,Proto*); |
| 126 | f->sizep=n; |
| 127 | for (i=0; i<n; i++) f->p[i]=NULL; |
| 128 | for (i=0; i<n; i++) |
| 129 | { |
| 130 | f->p[i]=luaF_newproto(S->L); |
| 131 | LoadFunction(S,f->p[i]); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | static void LoadUpvalues(LoadState* S, Proto* f) |
| 136 | { |
| 137 | int i,n; |
| 138 | n=LoadInt(S); |
| 139 | f->upvalues=luaM_newvector(S->L,n,Upvaldesc); |
| 140 | f->sizeupvalues=n; |
| 141 | for (i=0; i<n; i++) f->upvalues[i].name=NULL; |
| 142 | for (i=0; i<n; i++) |
| 143 | { |
| 144 | f->upvalues[i].instack=LoadByte(S); |
| 145 | f->upvalues[i].idx=LoadByte(S); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | static void LoadDebug(LoadState* S, Proto* f) |
| 150 | { |
| 151 | int i,n; |
| 152 | f->source=LoadString(S); |
| 153 | n=LoadInt(S); |
| 154 | f->lineinfo=luaM_newvector(S->L,n,int); |
| 155 | f->sizelineinfo=n; |
| 156 | LoadVector(S,f->lineinfo,n,sizeof(int)); |
| 157 | n=LoadInt(S); |
| 158 | f->locvars=luaM_newvector(S->L,n,LocVar); |
| 159 | f->sizelocvars=n; |
| 160 | for (i=0; i<n; i++) f->locvars[i].varname=NULL; |
| 161 | for (i=0; i<n; i++) |
| 162 | { |
| 163 | f->locvars[i].varname=LoadString(S); |
| 164 | f->locvars[i].startpc=LoadInt(S); |
| 165 | f->locvars[i].endpc=LoadInt(S); |
| 166 | } |
| 167 | n=LoadInt(S); |
| 168 | for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S); |
| 169 | } |
| 170 | |
| 171 | static void LoadFunction(LoadState* S, Proto* f) |
| 172 | { |
| 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); |
| 178 | LoadCode(S,f); |
| 179 | LoadConstants(S,f); |
| 180 | LoadUpvalues(S,f); |
| 181 | LoadDebug(S,f); |
| 182 | } |
| 183 | |
| 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)) |
| 187 | #define N2 N1+2 |
| 188 | #define N3 N2+6 |
| 189 | |
| 190 | static void LoadHeader(LoadState* S) |
| 191 | { |
| 192 | lu_byte h[LUAC_HEADERSIZE]; |
| 193 | lu_byte s[LUAC_HEADERSIZE]; |
| 194 | luaU_header(h); |
| 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"); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | ** load precompiled chunk |
| 205 | */ |
| 206 | Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name) |
| 207 | { |
| 208 | LoadState S; |
| 209 | Closure* cl; |
| 210 | if (*name=='@' || *name=='=') |
| 211 | S.name=name+1; |
| 212 | else if (*name==LUA_SIGNATURE[0]) |
| 213 | S.name="binary string"; |
| 214 | else |
| 215 | S.name=name; |
| 216 | S.L=L; |
| 217 | S.Z=Z; |
| 218 | S.b=buff; |
| 219 | LoadHeader(&S); |
| 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) |
| 225 | { |
| 226 | Proto* p=cl->l.p; |
| 227 | cl=luaF_newLclosure(L,cl->l.p->sizeupvalues); |
| 228 | cl->l.p=p; |
| 229 | setclLvalue(L,L->top-1,cl); |
| 230 | } |
| 231 | luai_verifycode(L,buff,cl->l.p); |
| 232 | return cl; |
| 233 | } |
| 234 | |
| 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 */ |
| 238 | |
| 239 | /* |
| 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 |
| 243 | */ |
| 244 | void luaU_header (lu_byte* h) |
| 245 | { |
| 246 | int x=1; |
| 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)); |
| 258 | } |