| /* |
| ** $Id: lundump.c,v 1.31 2000/09/19 18:18:38 lhf Exp $ |
| ** load bytecodes from files |
| ** See Copyright Notice in lua.h |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "lfunc.h" |
| #include "lmem.h" |
| #include "lopcodes.h" |
| #include "lstring.h" |
| #include "lundump.h" |
| |
| #define LoadByte ezgetc |
| |
| static const char* ZNAME (ZIO* Z) |
| { |
| const char* s=zname(Z); |
| return (*s=='@') ? s+1 : s; |
| } |
| |
| static void unexpectedEOZ (lua_State* L, ZIO* Z) |
| { |
| luaO_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 void LoadBlock (lua_State* L, void* b, size_t size, ZIO* Z, int swap) |
| { |
| if (swap) |
| { |
| char *p=(char *) b+size-1; |
| int n=size; |
| while (n--) *p--=(char)ezgetc(L,Z); |
| } |
| else |
| ezread(L,Z,b,size); |
| } |
| |
| static void LoadVector (lua_State* L, void* b, int m, size_t size, ZIO* Z, int swap) |
| { |
| if (swap) |
| { |
| char *q=(char *) b; |
| while (m--) |
| { |
| char *p=q+size-1; |
| int n=size; |
| while (n--) *p--=(char)ezgetc(L,Z); |
| q+=size; |
| } |
| } |
| else |
| ezread(L,Z,b,m*size); |
| } |
| |
| static int LoadInt (lua_State* L, ZIO* Z, int swap) |
| { |
| int x; |
| LoadBlock(L,&x,sizeof(x),Z,swap); |
| return x; |
| } |
| |
| static size_t LoadSize (lua_State* L, ZIO* Z, int swap) |
| { |
| size_t x; |
| LoadBlock(L,&x,sizeof(x),Z,swap); |
| return x; |
| } |
| |
| static Number LoadNumber (lua_State* L, ZIO* Z, int swap) |
| { |
| Number x; |
| LoadBlock(L,&x,sizeof(x),Z,swap); |
| return x; |
| } |
| |
| static TString* LoadString (lua_State* L, ZIO* Z, int swap) |
| { |
| size_t size=LoadSize(L,Z,swap); |
| if (size==0) |
| return NULL; |
| else |
| { |
| char* s=luaO_openspace(L,size); |
| LoadBlock(L,s,size,Z,0); |
| return luaS_newlstr(L,s,size-1); /* remove trailing '\0' */ |
| } |
| } |
| |
| static void LoadCode (lua_State* L, Proto* tf, ZIO* Z, int swap) |
| { |
| int size=LoadInt(L,Z,swap); |
| tf->code=luaM_newvector(L,size,Instruction); |
| LoadVector(L,tf->code,size,sizeof(*tf->code),Z,swap); |
| if (tf->code[size-1]!=OP_END) luaO_verror(L,"bad code in `%.255s'",ZNAME(Z)); |
| } |
| |
| static void LoadLocals (lua_State* L, Proto* tf, ZIO* Z, int swap) |
| { |
| int i,n; |
| tf->nlocvars=n=LoadInt(L,Z,swap); |
| tf->locvars=luaM_newvector(L,n,LocVar); |
| for (i=0; i<n; i++) |
| { |
| tf->locvars[i].varname=LoadString(L,Z,swap); |
| tf->locvars[i].startpc=LoadInt(L,Z,swap); |
| tf->locvars[i].endpc=LoadInt(L,Z,swap); |
| } |
| } |
| |
| static void LoadLines (lua_State* L, Proto* tf, ZIO* Z, int swap) |
| { |
| int n=LoadInt(L,Z,swap); |
| if (n==0) return; |
| tf->lineinfo=luaM_newvector(L,n,int); |
| LoadVector(L,tf->lineinfo,n,sizeof(*tf->lineinfo),Z,swap); |
| } |
| |
| static Proto* LoadFunction (lua_State* L, ZIO* Z, int swap); |
| |
| static void LoadConstants (lua_State* L, Proto* tf, ZIO* Z, int swap) |
| { |
| int i,n; |
| tf->nkstr=n=LoadInt(L,Z,swap); |
| tf->kstr=luaM_newvector(L,n,TString*); |
| for (i=0; i<n; i++) |
| tf->kstr[i]=LoadString(L,Z,swap); |
| tf->nknum=n=LoadInt(L,Z,swap); |
| tf->knum=luaM_newvector(L,n,Number); |
| LoadVector(L,tf->knum,n,sizeof(*tf->knum),Z,swap); |
| tf->nkproto=n=LoadInt(L,Z,swap); |
| tf->kproto=luaM_newvector(L,n,Proto*); |
| for (i=0; i<n; i++) |
| tf->kproto[i]=LoadFunction(L,Z,swap); |
| } |
| |
| static Proto* LoadFunction (lua_State* L, ZIO* Z, int swap) |
| { |
| Proto* tf=luaF_newproto(L); |
| tf->source=LoadString(L,Z,swap); |
| tf->lineDefined=LoadInt(L,Z,swap); |
| tf->numparams=LoadInt(L,Z,swap); |
| tf->is_vararg=LoadByte(L,Z); |
| tf->maxstacksize=LoadInt(L,Z,swap); |
| LoadCode(L,tf,Z,swap); |
| LoadLocals(L,tf,Z,swap); |
| LoadLines(L,tf,Z,swap); |
| LoadConstants(L,tf,Z,swap); |
| 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) luaO_verror(L,"bad signature in `%.255s'",ZNAME(Z)); |
| } |
| |
| static void TestSize (lua_State* L, int s, const char* what, ZIO* Z) |
| { |
| int r=ezgetc(L,Z); |
| if (r!=s) |
| luaO_verror(L,"virtual machine mismatch in `%.255s':\n" |
| " %s is %d but read %d",ZNAME(Z),what,r,s); |
| } |
| |
| #define TESTSIZE(s) TestSize(L,s,#s,Z) |
| #define V(v) v/16,v%16 |
| |
| static int LoadHeader (lua_State* L, ZIO* Z) |
| { |
| int version,swap; |
| Number f=0,tf=TEST_NUMBER; |
| LoadSignature(L,Z); |
| version=ezgetc(L,Z); |
| if (version>VERSION) |
| luaO_verror(L,"`%.255s' too new:\n" |
| " read version %d.%d; expected at most %d.%d", |
| ZNAME(Z),V(version),V(VERSION)); |
| if (version<VERSION0) /* check last major change */ |
| luaO_verror(L,"`%.255s' too old:\n" |
| " read version %d.%d; expected at least %d.%d", |
| ZNAME(Z),V(version),V(VERSION)); |
| swap=(luaU_endianess()!=ezgetc(L,Z)); /* need to swap bytes? */ |
| if (swap) puts("swap!"); |
| TESTSIZE(sizeof(int)); |
| TESTSIZE(sizeof(size_t)); |
| TESTSIZE(sizeof(Instruction)); |
| TESTSIZE(SIZE_INSTRUCTION); |
| TESTSIZE(SIZE_OP); |
| TESTSIZE(SIZE_B); |
| TESTSIZE(sizeof(Number)); |
| f=LoadNumber(L,Z,swap); |
| if ((long)f!=(long)tf) /* disregard errors in last bit of fraction */ |
| luaO_verror(L,"unknown number format in `%.255s':\n" |
| " read " NUMBER_FMT "; expected " NUMBER_FMT, |
| ZNAME(Z),f,tf); |
| return swap; |
| } |
| |
| 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_undump (lua_State* L, ZIO* Z) |
| { |
| Proto* tf=NULL; |
| int c=zgetc(Z); |
| if (c==ID_CHUNK) |
| tf=LoadChunk(L,Z); |
| c=zgetc(Z); |
| if (c!=EOZ) |
| luaO_verror(L,"`%.255s' apparently contains more than one chunk",ZNAME(Z)); |
| return tf; |
| } |
| |
| /* |
| ** find byte order |
| */ |
| int luaU_endianess (void) |
| { |
| int x=1; |
| return *(char*)&x; |
| } |