| /* |
| ** $Id: lundump.c,v 1.18 2000/03/03 14:58:26 roberto Exp roberto $ |
| ** load bytecodes from files |
| ** See Copyright Notice in lua.h |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #define LUA_REENTRANT |
| |
| #include "lauxlib.h" |
| #include "lfunc.h" |
| #include "lmem.h" |
| #include "lopcodes.h" |
| #include "lstring.h" |
| #include "lundump.h" |
| |
| #define LoadBlock(L,b,size,Z) ezread(L,Z,b,size) |
| |
| static void unexpectedEOZ (lua_State* L, ZIO* Z) |
| { |
| luaL_verror(L,"unexpected end of file in %.255s",zname(Z)); |
| } |
| |
| static int ezgetc (lua_State* L, ZIO* Z) |
| { |
| int c=zgetc(Z); |
| if (c==EOZ) unexpectedEOZ(L,Z); |
| return c; |
| } |
| |
| static void ezread (lua_State* L, ZIO* Z, void* b, int n) |
| { |
| int r=zread(Z,b,n); |
| if (r!=0) unexpectedEOZ(L,Z); |
| } |
| |
| static unsigned int LoadWord (lua_State* L, ZIO* Z) |
| { |
| unsigned int hi=ezgetc(L,Z); |
| unsigned int lo=ezgetc(L,Z); |
| return (hi<<8)|lo; |
| } |
| |
| static unsigned long LoadLong (lua_State* L, ZIO* Z) |
| { |
| unsigned long hi=LoadWord(L,Z); |
| unsigned long lo=LoadWord(L,Z); |
| return (hi<<16)|lo; |
| } |
| |
| static Number LoadNumber (lua_State* L, ZIO* Z) |
| { |
| char b[256]; |
| int size=ezgetc(L,Z); |
| LoadBlock(L,b,size,Z); |
| b[size]=0; |
| return luaU_str2d(L,b,zname(Z)); |
| } |
| |
| static int LoadInt (lua_State* L, ZIO* Z, const char* message) |
| { |
| unsigned long l=LoadLong(L,Z); |
| unsigned int i=l; |
| if (i!=l) luaL_verror(L,message,l,zname(Z)); |
| return i; |
| } |
| |
| static void LoadCode (lua_State* L, Proto* tf, ZIO* Z) |
| { |
| int size=LoadInt(L,Z,"code too long (%lu bytes) in %.255s"); |
| tf->code=luaM_newvector(L,size,Instruction); |
| LoadBlock(L,tf->code,size*sizeof(tf->code[0]),Z); |
| if (tf->code[size-1]!=OP_END) luaL_verror(L,"bad code in %.255s",zname(Z)); |
| } |
| |
| static TString* LoadString (lua_State* L, ZIO* Z) |
| { |
| long size=LoadLong(L,Z); |
| if (size==0) |
| return NULL; |
| else |
| { |
| char* s=luaL_openspace(L,size); |
| LoadBlock(L,s,size,Z); |
| return luaS_newlstr(L,s,size-1); /* remove trailing '\0' */ |
| } |
| } |
| |
| static void LoadLocals (lua_State* L, Proto* tf, ZIO* Z) |
| { |
| int i,n=LoadInt(L,Z,"too many locals (%lu) in %.255s"); |
| if (n==0) return; |
| tf->locvars=luaM_newvector(L,n+1,LocVar); |
| for (i=0; i<n; i++) |
| { |
| tf->locvars[i].line=LoadInt(L,Z,"too many lines (%lu) in %.255s"); |
| tf->locvars[i].varname=LoadString(L,Z); |
| } |
| tf->locvars[i].line=-1; /* flag end of vector */ |
| tf->locvars[i].varname=NULL; |
| } |
| |
| static Proto* LoadFunction (lua_State* L, ZIO* Z, int native); |
| |
| static void LoadConstants (lua_State* L, Proto* tf, ZIO* Z, int native) |
| { |
| int i,n; |
| tf->nkstr=n=LoadInt(L,Z,"too many strings (%lu) in %.255s"); |
| if (n>0) |
| { |
| tf->kstr=luaM_newvector(L,n,TString*); |
| for (i=0; i<n; i++) tf->kstr[i]=LoadString(L,Z); |
| } |
| tf->nknum=n=LoadInt(L,Z,"too many numbers (%lu) in %.255s"); |
| if (n>0) |
| { |
| tf->knum=luaM_newvector(L,n,Number); |
| if (native) |
| LoadBlock(L,tf->knum,n*sizeof(tf->knum[0]),Z); |
| else |
| for (i=0; i<n; i++) tf->knum[i]=LoadNumber(L,Z); |
| } |
| tf->nkproto=n=LoadInt(L,Z,"too many functions (%lu) in %.255s"); |
| if (n>0) |
| { |
| tf->kproto=luaM_newvector(L,n,Proto*); |
| for (i=0; i<n; i++) tf->kproto[i]=LoadFunction(L,Z,native); |
| } |
| } |
| |
| static Proto* LoadFunction (lua_State* L, ZIO* Z, int native) |
| { |
| Proto* tf=luaF_newproto(L); |
| tf->lineDefined=LoadInt(L,Z,"lineDefined too large (%lu) in %.255s"); |
| tf->source=LoadString(L,Z); |
| if (tf->source==NULL) tf->source=luaS_new(L,zname(Z)); |
| tf->numparams=LoadInt(L,Z,"numparams too large (%lu) in %.255s"); |
| tf->is_vararg=LoadInt(L,Z,"is_vararg too large (%lu) in %.255s"); |
| tf->maxstacksize=LoadInt(L,Z,"maxstacksize too large (%lu) in %.255s"); |
| LoadCode(L,tf,Z); |
| LoadLocals(L,tf,Z); |
| LoadConstants(L,tf,Z,native); |
| return tf; |
| } |
| |
| static void LoadSignature (lua_State* L, ZIO* Z) |
| { |
| const char* s=SIGNATURE; |
| while (*s!=0 && ezgetc(L,Z)==*s) |
| ++s; |
| if (*s!=0) luaL_verror(L,"bad signature in %.255s",zname(Z)); |
| } |
| |
| #define V(v) v/16,v%16 |
| |
| static int LoadHeader (lua_State* L, ZIO* Z) |
| { |
| int version,sizeofR,native; |
| LoadSignature(L,Z); |
| version=ezgetc(L,Z); |
| if (version>VERSION) |
| luaL_verror(L, |
| "%.255s too new: its version is %d.%d; expected at most %d.%d", |
| zname(Z),V(version),V(VERSION)); |
| if (version<VERSION0) /* check last major change */ |
| luaL_verror(L, |
| "%.255s too old: its version is %d.%d; expected at least %d.%d", |
| zname(Z),V(version),V(VERSION)); |
| sizeofR=ezgetc(L,Z); |
| native=(sizeofR!=0); |
| if (native) /* test number representation */ |
| { |
| if (sizeofR!=sizeof(Number)) |
| luaL_verror(L,"unknown number size in %.255s: read %d; expected %d", |
| zname(Z),sizeofR,(int)sizeof(Number)); |
| else |
| { |
| Number f=0,tf=TEST_NUMBER; |
| LoadBlock(L,&f,sizeof(f),Z); |
| if ((long)f!=(long)tf) /* disregard errors in last bit of fraction */ |
| luaL_verror(L,"unknown number format in %.255s: " |
| "read " NUMBER_FMT "; expected " NUMBER_FMT, |
| zname(Z),f,tf); |
| } |
| } |
| return native; |
| } |
| |
| static Proto* LoadChunk (lua_State* L, ZIO* Z) |
| { |
| return LoadFunction(L,Z,LoadHeader(L,Z)); |
| } |
| |
| /* |
| ** load one chunk from a file or buffer |
| ** return main if ok and NULL at EOF |
| */ |
| Proto* luaU_undump1 (lua_State* L, ZIO* Z) |
| { |
| int c=zgetc(Z); |
| if (c==ID_CHUNK) |
| return LoadChunk(L,Z); |
| else if (c!=EOZ) |
| luaL_verror(L,"%.255s is not a Lua binary file",zname(Z)); |
| return NULL; |
| } |
| |
| /* |
| * convert number from text |
| */ |
| double luaU_str2d (lua_State* L, const char* b, const char* where) |
| { |
| double x; |
| if (!luaO_str2d(b,&x)) |
| luaL_verror(L,"cannot convert number '%.255s' in %.255s",b,where); |
| return x; |
| } |