| /* |
| ** $Id: lundump.c,v 1.43 2002/08/07 00:36:03 lhf Exp $ |
| ** load pre-compiled Lua chunks |
| ** See Copyright Notice in lua.h |
| */ |
| |
| #include "lua.h" |
| |
| #include "ldebug.h" |
| #include "lfunc.h" |
| #include "lmem.h" |
| #include "lopcodes.h" |
| #include "lstring.h" |
| #include "lundump.h" |
| #include "lzio.h" |
| |
| #define LoadByte (lu_byte) ezgetc |
| |
| typedef struct { |
| lua_State* L; |
| ZIO* Z; |
| int swap; |
| const char* name; |
| } LoadState; |
| |
| static void unexpectedEOZ (LoadState* S) |
| { |
| luaG_runerror(S->L,"unexpected end of file in %s",S->name); |
| } |
| |
| static int ezgetc (LoadState* S) |
| { |
| int c=zgetc(S->Z); |
| if (c==EOZ) unexpectedEOZ(S); |
| return c; |
| } |
| |
| static void ezread (LoadState* S, void* b, int n) |
| { |
| int r=luaZ_read(S->Z,b,n); |
| if (r!=0) unexpectedEOZ(S); |
| } |
| |
| static void LoadBlock (LoadState* S, void* b, size_t size) |
| { |
| if (S->swap) |
| { |
| char *p=(char*) b+size-1; |
| int n=size; |
| while (n--) *p--=(char)ezgetc(S); |
| } |
| else |
| ezread(S,b,size); |
| } |
| |
| static void LoadVector (LoadState* S, void* b, int m, size_t size) |
| { |
| if (S->swap) |
| { |
| char *q=(char*) b; |
| while (m--) |
| { |
| char *p=q+size-1; |
| int n=size; |
| while (n--) *p--=(char)ezgetc(S); |
| q+=size; |
| } |
| } |
| else |
| ezread(S,b,m*size); |
| } |
| |
| static int LoadInt (LoadState* S) |
| { |
| int x; |
| LoadBlock(S,&x,sizeof(x)); |
| if (x<0) luaG_runerror(S->L,"bad integer in %s",S->name); |
| return x; |
| } |
| |
| static size_t LoadSize (LoadState* S) |
| { |
| size_t x; |
| LoadBlock(S,&x,sizeof(x)); |
| return x; |
| } |
| |
| static lua_Number LoadNumber (LoadState* S) |
| { |
| lua_Number x; |
| LoadBlock(S,&x,sizeof(x)); |
| return x; |
| } |
| |
| static TString* LoadString (LoadState* S) |
| { |
| size_t size=LoadSize(S); |
| if (size==0) |
| return NULL; |
| else |
| { |
| char* s=luaO_openspace(S->L,size,char); |
| ezread(S,s,size); |
| return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */ |
| } |
| } |
| |
| static void LoadCode (LoadState* S, Proto* f) |
| { |
| int size=LoadInt(S); |
| f->code=luaM_newvector(S->L,size,Instruction); |
| f->sizecode=size; |
| LoadVector(S,f->code,size,sizeof(*f->code)); |
| } |
| |
| static void LoadLocals (LoadState* S, Proto* f) |
| { |
| int i,n; |
| n=LoadInt(S); |
| f->locvars=luaM_newvector(S->L,n,LocVar); |
| f->sizelocvars=n; |
| for (i=0; i<n; i++) |
| { |
| f->locvars[i].varname=LoadString(S); |
| f->locvars[i].startpc=LoadInt(S); |
| f->locvars[i].endpc=LoadInt(S); |
| } |
| } |
| |
| static void LoadLines (LoadState* S, Proto* f) |
| { |
| int n; |
| n=LoadInt(S); |
| f->lineinfo=luaM_newvector(S->L,n,int); |
| LoadVector(S,f->lineinfo,n,sizeof(*f->lineinfo)); |
| } |
| |
| static Proto* LoadFunction (LoadState* S, TString* p); |
| |
| static void LoadConstants (LoadState* S, Proto* f) |
| { |
| int i,n; |
| n=LoadInt(S); |
| f->k=luaM_newvector(S->L,n,TObject); |
| f->sizek=n; |
| for (i=0; i<n; i++) |
| { |
| TObject* o=&f->k[i]; |
| int t=LoadByte(S); |
| switch (t) |
| { |
| case LUA_TNUMBER: |
| setnvalue(o,LoadNumber(S)); |
| break; |
| case LUA_TSTRING: |
| setsvalue(o,LoadString(S)); |
| break; |
| case LUA_TNIL: |
| setnilvalue(o); |
| break; |
| default: |
| luaG_runerror(S->L,"bad constant type (%d) in %s",t,S->name); |
| break; |
| } |
| } |
| n=LoadInt(S); |
| f->p=luaM_newvector(S->L,n,Proto*); |
| f->sizep=n; |
| for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source); |
| } |
| |
| static Proto* LoadFunction (LoadState* S, TString* p) |
| { |
| Proto* f=luaF_newproto(S->L); |
| f->source=LoadString(S); if (f->source==NULL) f->source=p; |
| f->lineDefined=LoadInt(S); |
| f->nupvalues=LoadByte(S); |
| f->numparams=LoadByte(S); |
| f->is_vararg=LoadByte(S); |
| f->maxstacksize=LoadByte(S); |
| LoadLocals(S,f); |
| LoadLines(S,f); |
| LoadConstants(S,f); |
| LoadCode(S,f); |
| #ifndef TRUST_BINARIES |
| if (!luaG_checkcode(f)) luaG_runerror(S->L,"bad code in %s",S->name); |
| #endif |
| return f; |
| } |
| |
| static void LoadSignature (LoadState* S) |
| { |
| const char* s=LUA_SIGNATURE; |
| while (*s!=0 && ezgetc(S)==*s) |
| ++s; |
| if (*s!=0) luaG_runerror(S->L,"bad signature in %s",S->name); |
| } |
| |
| static void TestSize (LoadState* S, int s, const char* what) |
| { |
| int r=LoadByte(S); |
| if (r!=s) |
| luaG_runerror(S->L,"virtual machine mismatch in %s: " |
| "size of %s is %d but read %d",S->name,what,s,r); |
| } |
| |
| #define TESTSIZE(s,w) TestSize(S,s,w) |
| #define V(v) v/16,v%16 |
| |
| static void LoadHeader (LoadState* S) |
| { |
| int version; |
| lua_Number x=0,tx=TEST_NUMBER; |
| LoadSignature(S); |
| version=LoadByte(S); |
| if (version>VERSION) |
| luaG_runerror(S->L,"%s too new: " |
| "read version %d.%d; expected at most %d.%d", |
| S->name,V(version),V(VERSION)); |
| if (version<VERSION0) /* check last major change */ |
| luaG_runerror(S->L,"%s too old: " |
| "read version %d.%d; expected at least %d.%d", |
| S->name,V(version),V(VERSION0)); |
| S->swap=(luaU_endianness()!=LoadByte(S)); /* need to swap bytes? */ |
| TESTSIZE(sizeof(int),"int"); |
| TESTSIZE(sizeof(size_t), "size_t"); |
| TESTSIZE(sizeof(Instruction), "Instruction"); |
| TESTSIZE(SIZE_OP, "OP"); |
| TESTSIZE(SIZE_A, "A"); |
| TESTSIZE(SIZE_B, "B"); |
| TESTSIZE(SIZE_C, "C"); |
| TESTSIZE(sizeof(lua_Number), "number"); |
| x=LoadNumber(S); |
| if ((long)x!=(long)tx) /* disregard errors in last bits of fraction */ |
| luaG_runerror(S->L,"unknown number format in %s: read %f; expected %f", |
| S->name,x,tx); |
| } |
| |
| static Proto* LoadChunk (LoadState* S) |
| { |
| LoadHeader(S); |
| return LoadFunction(S,NULL); |
| } |
| |
| /* |
| ** load one chunk from a file or buffer |
| */ |
| Proto* luaU_undump (lua_State* L, ZIO* Z) |
| { |
| LoadState S; |
| Proto* f; |
| const char* s=zname(Z); |
| if (*s=='@' || *s=='=') |
| S.name=s+1; |
| else if (*s==LUA_SIGNATURE[0]) |
| S.name="binary string"; |
| else |
| S.name=s; |
| S.L=L; |
| S.Z=Z; |
| f=LoadChunk(&S); |
| if (zgetc(Z)!=EOZ) |
| luaG_runerror(L,"%s apparently contains more than one chunk",S.name); |
| return f; |
| } |
| |
| /* |
| ** find byte order |
| */ |
| int luaU_endianness (void) |
| { |
| int x=1; |
| return *(char*)&x; |
| } |