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| 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 } |
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