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/*
** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 roberto Exp $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/
#include <string.h>
#define lundump_c
#define LUA_CORE
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstring.h"
#include "lundump.h"
#include "lzio.h"
typedef struct {
lua_State* L;
ZIO* Z;
Mbuffer* b;
const char* name;
} LoadState;
static l_noret error(LoadState* S, const char* why)
{
luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why);
luaD_throw(S->L,LUA_ERRSYNTAX);
}
#define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
#define LoadByte(S) (lu_byte)LoadChar(S)
#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
#if !defined(luai_verifycode)
#define luai_verifycode(L,b,f) /* empty */
#endif
static void LoadBlock(LoadState* S, void* b, size_t size)
{
if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated");
}
static int LoadChar(LoadState* S)
{
char x;
LoadVar(S,x);
return x;
}
static int LoadInt(LoadState* S)
{
int x;
LoadVar(S,x);
if (x<0) error(S,"corrupted");
return x;
}
static lua_Number LoadNumber(LoadState* S)
{
lua_Number x;
LoadVar(S,x);
return x;
}
static TString* LoadString(LoadState* S)
{
size_t size;
LoadVar(S,size);
if (size==0)
return NULL;
else
{
char* s=luaZ_openspace(S->L,S->b,size);
LoadBlock(S,s,size*sizeof(char));
return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
}
}
static void LoadCode(LoadState* S, Proto* f)
{
int n=LoadInt(S);
f->code=luaM_newvector(S->L,n,Instruction);
f->sizecode=n;
LoadVector(S,f->code,n,sizeof(Instruction));
}
static void LoadFunction(LoadState* S, Proto* f);
static void LoadConstants(LoadState* S, Proto* f)
{
int i,n;
n=LoadInt(S);
f->k=luaM_newvector(S->L,n,TValue);
f->sizek=n;
for (i=0; i<n; i++) setnilvalue(&f->k[i]);
for (i=0; i<n; i++)
{
TValue* o=&f->k[i];
int t=LoadChar(S);
switch (t)
{
case LUA_TNIL:
setnilvalue(o);
break;
case LUA_TBOOLEAN:
setbvalue(o,LoadChar(S));
break;
case LUA_TNUMBER:
setnvalue(o,LoadNumber(S));
break;
case LUA_TSTRING:
setsvalue2n(S->L,o,LoadString(S));
break;
default: lua_assert(0);
}
}
n=LoadInt(S);
f->p=luaM_newvector(S->L,n,Proto*);
f->sizep=n;
for (i=0; i<n; i++) f->p[i]=NULL;
for (i=0; i<n; i++)
{
f->p[i]=luaF_newproto(S->L);
LoadFunction(S,f->p[i]);
}
}
static void LoadUpvalues(LoadState* S, Proto* f)
{
int i,n;
n=LoadInt(S);
f->upvalues=luaM_newvector(S->L,n,Upvaldesc);
f->sizeupvalues=n;
for (i=0; i<n; i++) f->upvalues[i].name=NULL;
for (i=0; i<n; i++)
{
f->upvalues[i].instack=LoadByte(S);
f->upvalues[i].idx=LoadByte(S);
}
}
static void LoadDebug(LoadState* S, Proto* f)
{
int i,n;
f->source=LoadString(S);
n=LoadInt(S);
f->lineinfo=luaM_newvector(S->L,n,int);
f->sizelineinfo=n;
LoadVector(S,f->lineinfo,n,sizeof(int));
n=LoadInt(S);
f->locvars=luaM_newvector(S->L,n,LocVar);
f->sizelocvars=n;
for (i=0; i<n; i++) f->locvars[i].varname=NULL;
for (i=0; i<n; i++)
{
f->locvars[i].varname=LoadString(S);
f->locvars[i].startpc=LoadInt(S);
f->locvars[i].endpc=LoadInt(S);
}
n=LoadInt(S);
for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S);
}
static void LoadFunction(LoadState* S, Proto* f)
{
f->linedefined=LoadInt(S);
f->lastlinedefined=LoadInt(S);
f->numparams=LoadByte(S);
f->is_vararg=LoadByte(S);
f->maxstacksize=LoadByte(S);
LoadCode(S,f);
LoadConstants(S,f);
LoadUpvalues(S,f);
LoadDebug(S,f);
}
/* the code below must be consistent with the code in luaU_header */
#define N0 LUAC_HEADERSIZE
#define N1 (sizeof(LUA_SIGNATURE)-sizeof(char))
#define N2 N1+2
#define N3 N2+6
static void LoadHeader(LoadState* S)
{
lu_byte h[LUAC_HEADERSIZE];
lu_byte s[LUAC_HEADERSIZE];
luaU_header(h);
memcpy(s,h,sizeof(char)); /* first char already read */
LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char));
if (memcmp(h,s,N0)==0) return;
if (memcmp(h,s,N1)!=0) error(S,"not a");
if (memcmp(h,s,N2)!=0) error(S,"version mismatch in");
if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted");
}
/*
** load precompiled chunk
*/
Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
{
LoadState S;
Closure* cl;
if (*name=='@' || *name=='=')
S.name=name+1;
else if (*name==LUA_SIGNATURE[0])
S.name="binary string";
else
S.name=name;
S.L=L;
S.Z=Z;
S.b=buff;
LoadHeader(&S);
cl=luaF_newLclosure(L,1);
setclLvalue(L,L->top,cl); incr_top(L);
cl->l.p=luaF_newproto(L);
LoadFunction(&S,cl->l.p);
if (cl->l.p->sizeupvalues != 1)
{
Proto* p=cl->l.p;
cl=luaF_newLclosure(L,cl->l.p->sizeupvalues);
cl->l.p=p;
setclLvalue(L,L->top-1,cl);
}
luai_verifycode(L,buff,cl->l.p);
return cl;
}
#define MYINT(s) (s[0]-'0')
#define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR)
#define FORMAT 0 /* this is the official format */
/*
* make header for precompiled chunks
* if you change the code below be sure to update LoadHeader and FORMAT above
* and LUAC_HEADERSIZE in lundump.h
*/
void luaU_header (lu_byte* h)
{
int x=1;
memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char));
h+=sizeof(LUA_SIGNATURE)-sizeof(char);
*h++=cast_byte(VERSION);
*h++=cast_byte(FORMAT);
*h++=cast_byte(*(char*)&x); /* endianness */
*h++=cast_byte(sizeof(int));
*h++=cast_byte(sizeof(size_t));
*h++=cast_byte(sizeof(Instruction));
*h++=cast_byte(sizeof(lua_Number));
*h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */
memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char));
}
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