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/*
** $Id: dump.c,v 1.20 1999/07/02 19:34:26 lhf Exp $
** save bytecodes to file
** See Copyright Notice in lua.h
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "luac.h"
#ifdef OLD_ANSI
#define strerror(e) "(no error message provided by operating system)"
#endif
#define DumpBlock(b,size,D) fwrite(b,size,1,D)
#define DumpInt DumpLong
static void DumpWord(int i, FILE* D)
{
int hi= 0x0000FF & (i>>8);
int lo= 0x0000FF & i;
fputc(hi,D);
fputc(lo,D);
}
static void DumpLong(long i, FILE* D)
{
int hi= 0x00FFFF & (i>>16);
int lo= 0x00FFFF & i;
DumpWord(hi,D);
DumpWord(lo,D);
}
static void DumpNumber(real x, FILE* D, int native, TProtoFunc* tf)
{
if (native)
DumpBlock(&x,sizeof(x),D);
else
{
char b[256];
int n;
sprintf(b,NUMBER_FMT"%n",x,&n);
luaU_str2d(b,tf->source->str); /* help lundump not to fail */
fputc(n,D);
DumpBlock(b,n,D);
}
}
static void DumpCode(TProtoFunc* tf, FILE* D)
{
int size=luaU_codesize(tf);
DumpLong(size,D);
DumpBlock(tf->code,size,D);
}
static void DumpString(char* s, int size, FILE* D)
{
if (s==NULL)
DumpLong(0,D);
else
{
DumpLong(size,D);
DumpBlock(s,size,D);
}
}
static void DumpTString(TaggedString* s, FILE* D)
{
if (s==NULL)
DumpString(NULL,0,D);
else
DumpString(s->str,s->u.s.len+1,D);
}
static void DumpLocals(TProtoFunc* tf, FILE* D)
{
if (tf->locvars==NULL)
DumpInt(0,D);
else
{
LocVar* v;
int n=0;
for (v=tf->locvars; v->line>=0; v++)
++n;
DumpInt(n,D);
for (v=tf->locvars; v->line>=0; v++)
{
DumpInt(v->line,D);
DumpTString(v->varname,D);
}
}
}
static void DumpFunction(TProtoFunc* tf, FILE* D, int native);
static void DumpConstants(TProtoFunc* tf, FILE* D, int native)
{
int i,n=tf->nconsts;
DumpInt(n,D);
for (i=0; i<n; i++)
{
TObject* o=tf->consts+i;
fputc(-ttype(o),D); /* ttype(o) is negative - ORDER LUA_T */
switch (ttype(o))
{
case LUA_T_NUMBER:
DumpNumber(nvalue(o),D,native,tf);
break;
case LUA_T_STRING:
DumpTString(tsvalue(o),D);
break;
case LUA_T_PROTO:
DumpFunction(tfvalue(o),D,native);
break;
case LUA_T_NIL:
break;
default: /* cannot happen */
luaU_badconstant("dump",i,o,tf);
break;
}
}
}
static void DumpFunction(TProtoFunc* tf, FILE* D, int native)
{
DumpInt(tf->lineDefined,D);
DumpTString(tf->source,D);
DumpCode(tf,D);
DumpLocals(tf,D);
DumpConstants(tf,D,native);
if (ferror(D))
luaL_verror("write error" IN ": %s (errno=%d)",INLOC,strerror(errno),errno);
}
static void DumpHeader(TProtoFunc* Main, FILE* D, int native)
{
fputc(ID_CHUNK,D);
fputs(SIGNATURE,D);
fputc(VERSION,D);
if (native)
{
fputc(sizeof(real),D);
DumpNumber(TEST_NUMBER,D,native,Main);
}
else
fputc(0,D);
}
void luaU_dumpchunk(TProtoFunc* Main, FILE* D, int native)
{
DumpHeader(Main,D,native);
DumpFunction(Main,D,native);
}
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