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/*
** $Id: lundump.c,v 1.19 1999/04/15 12:30:03 lhf Exp lhf $
** load bytecodes from files
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <string.h>
#include "lauxlib.h"
#include "lfunc.h"
#include "lmem.h"
#include "lopcodes.h"
#include "lstring.h"
#include "lundump.h"
#define LoadBlock(b,size,Z) ezread(Z,b,size)
static void unexpectedEOZ (ZIO* Z)
{
luaL_verror("unexpected end of file in %s",zname(Z));
}
static int ezgetc (ZIO* Z)
{
int c=zgetc(Z);
if (c==EOZ) unexpectedEOZ(Z);
return c;
}
static void ezread (ZIO* Z, void* b, int n)
{
int r=zread(Z,b,n);
if (r!=0) unexpectedEOZ(Z);
}
static unsigned int LoadWord (ZIO* Z)
{
unsigned int hi=ezgetc(Z);
unsigned int lo=ezgetc(Z);
return (hi<<8)|lo;
}
static unsigned long LoadLong (ZIO* Z)
{
unsigned long hi=LoadWord(Z);
unsigned long lo=LoadWord(Z);
return (hi<<16)|lo;
}
static real LoadNumber (ZIO* Z)
{
#ifdef LUAC_NATIVE
real x;
LoadBlock(&x,sizeof(x),Z);
return x;
#else
char b[256];
int size=ezgetc(Z);
LoadBlock(b,size,Z);
b[size]=0;
if (b[0]=='-')
return -luaO_str2d(b+1);
else
return luaO_str2d(b);
#endif
}
static int LoadInt (ZIO* Z, char* message)
{
unsigned long l=LoadLong(Z);
unsigned int i=l;
if (i!=l) luaL_verror(message,l,zname(Z));
return i;
}
#define PAD 5 /* two word operands plus opcode */
static Byte* LoadCode (ZIO* Z)
{
int size=LoadInt(Z,"code too long (%ld bytes) in %s");
Byte* b=luaM_malloc(size+PAD);
LoadBlock(b,size,Z);
if (b[size-1]!=ENDCODE) luaL_verror("bad code in %s",zname(Z));
memset(b+size,ENDCODE,PAD); /* pad code for safety */
return b;
}
static TaggedString* LoadTString (ZIO* Z)
{
long size=LoadLong(Z);
if (size==0)
return NULL;
else
{
char* s=luaL_openspace(size);
LoadBlock(s,size,Z);
return luaS_newlstr(s,size-1);
}
}
static void LoadLocals (TProtoFunc* tf, ZIO* Z)
{
int i,n=LoadInt(Z,"too many locals (%ld) in %s");
if (n==0) return;
tf->locvars=luaM_newvector(n+1,LocVar);
for (i=0; i<n; i++)
{
tf->locvars[i].line=LoadInt(Z,"too many lines (%ld) in %s");
tf->locvars[i].varname=LoadTString(Z);
}
tf->locvars[i].line=-1; /* flag end of vector */
tf->locvars[i].varname=NULL;
}
static TProtoFunc* LoadFunction (ZIO* Z);
static void LoadConstants (TProtoFunc* tf, ZIO* Z)
{
int i,n=LoadInt(Z,"too many constants (%ld) in %s");
tf->nconsts=n;
if (n==0) return;
tf->consts=luaM_newvector(n,TObject);
for (i=0; i<n; i++)
{
TObject* o=tf->consts+i;
ttype(o)=-ezgetc(Z); /* ttype(o) is negative - ORDER LUA_T */
switch (ttype(o))
{
case LUA_T_NUMBER:
nvalue(o)=LoadNumber(Z);
break;
case LUA_T_STRING:
tsvalue(o)=LoadTString(Z);
break;
case LUA_T_PROTO:
tfvalue(o)=LoadFunction(Z);
break;
case LUA_T_NIL:
break;
default: /* cannot happen */
luaU_badconstant("load",i,o,tf);
break;
}
}
}
static TProtoFunc* LoadFunction (ZIO* Z)
{
TProtoFunc* tf=luaF_newproto();
tf->lineDefined=LoadInt(Z,"lineDefined too large (%ld) in %s");
tf->source=LoadTString(Z);
if (tf->source==NULL) tf->source=luaS_new(zname(Z));
tf->code=LoadCode(Z);
LoadLocals(tf,Z);
LoadConstants(tf,Z);
return tf;
}
static void LoadSignature (ZIO* Z)
{
char* s=SIGNATURE;
while (*s!=0 && ezgetc(Z)==*s)
++s;
if (*s!=0) luaL_verror("bad signature in %s",zname(Z));
}
static void LoadHeader (ZIO* Z)
{
int version,sizeofR;
LoadSignature(Z);
version=ezgetc(Z);
if (version>VERSION)
luaL_verror(
"%s too new: version=0x%02x; expected at most 0x%02x",
zname(Z),version,VERSION);
if (version<VERSION0) /* check last major change */
luaL_verror(
"%s too old: version=0x%02x; expected at least 0x%02x",
zname(Z),version,VERSION0);
sizeofR=ezgetc(Z); /* test number representation */
#ifdef LUAC_NATIVE
if (sizeofR==0)
luaL_verror("cannot read numbers in %s: no support for decimal format",
zname(Z));
if (sizeofR!=sizeof(real))
luaL_verror("unknown number size in %s: read %d; expected %d",
zname(Z),sizeofR,sizeof(real));
else
{
real f=-TEST_NUMBER,tf=TEST_NUMBER;
f=LoadNumber(Z);
if ((long)f!=(long)tf)
luaL_verror("unknown number format in %s: "
"read " NUMBER_FMT "; expected " NUMBER_FMT,
zname(Z),f,tf);
}
#else
if (sizeofR!=0)
luaL_verror("cannot read numbers in %s: no support for native format",
zname(Z));
#endif
}
static TProtoFunc* LoadChunk (ZIO* Z)
{
LoadHeader(Z);
return LoadFunction(Z);
}
/*
** load one chunk from a file or buffer
** return main if ok and NULL at EOF
*/
TProtoFunc* luaU_undump1 (ZIO* Z)
{
int c=zgetc(Z);
if (c==ID_CHUNK)
return LoadChunk(Z);
else if (c!=EOZ)
luaL_verror("%s is not a Lua binary file",zname(Z));
return NULL;
}
/*
* handle constants that cannot happen
*/
void luaU_badconstant (char* s, int i, TObject* o, TProtoFunc* tf)
{
int t=ttype(o);
char* name= (t>0 || t<LUA_T_LINE) ? "?" : luaO_typenames[-t];
luaL_verror("cannot %s constant #%d: type=%d [%s]" IN,s,i,t,name,INLOC);
}
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