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/*
** dump.c
** thread and save bytecodes to file
*/
char* rcs_dump="$Id: dump.c,v 1.17 1996/11/18 11:18:29 lhf Exp $";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "luac.h"
static TFunc* lastF=NULL; /* list of functions seen in code */
static int SawVar(int i, int at)
{
int old=VarLoc(i);
VarLoc(i)=at;
return old;
}
static int SawStr(int i, int at)
{
int old=StrLoc(i);
StrLoc(i)=at;
return old;
}
static void ThreadCode(Byte* code, Byte* end)
{
Byte* p;
int i;
for (i=0; i<lua_ntable; i++) VarLoc(i)=0;
for (i=0; i<lua_nconstant; i++) StrLoc(i)=0;
for (p=code; p!=end;)
{
OpCode op=(OpCode)*p;
int at=p-code+1;
switch (op)
{
case PUSHNIL:
case PUSH0:
case PUSH1:
case PUSH2:
case PUSHLOCAL0:
case PUSHLOCAL1:
case PUSHLOCAL2:
case PUSHLOCAL3:
case PUSHLOCAL4:
case PUSHLOCAL5:
case PUSHLOCAL6:
case PUSHLOCAL7:
case PUSHLOCAL8:
case PUSHLOCAL9:
case PUSHINDEXED:
case STORELOCAL0:
case STORELOCAL1:
case STORELOCAL2:
case STORELOCAL3:
case STORELOCAL4:
case STORELOCAL5:
case STORELOCAL6:
case STORELOCAL7:
case STORELOCAL8:
case STORELOCAL9:
case STOREINDEXED0:
case ADJUST0:
case EQOP:
case LTOP:
case LEOP:
case GTOP:
case GEOP:
case ADDOP:
case SUBOP:
case MULTOP:
case DIVOP:
case POWOP:
case CONCOP:
case MINUSOP:
case NOTOP:
case POP:
case RETCODE0:
p++;
break;
case PUSHBYTE:
case PUSHLOCAL:
case STORELOCAL:
case STOREINDEXED:
case STORELIST0:
case ADJUST:
case RETCODE:
p+=2;
break;
case PUSHWORD:
case CREATEARRAY:
case ONTJMP:
case ONFJMP:
case JMP:
case UPJMP:
case IFFJMP:
case IFFUPJMP:
case SETLINE:
case STORELIST:
case CALLFUNC:
p+=3;
break;
case PUSHFLOAT:
p+=5; /* assumes sizeof(float)==4 */
break;
case PUSHSELF:
case PUSHSTRING:
{
Word w;
p++;
get_word(w,p);
w=SawStr(w,at);
memcpy(p-2,&w,sizeof(w));
break;
}
case PUSHFUNCTION:
{
TFunc* tf;
p++;
get_code(tf,p);
tf->marked=at;
tf->next=NULL; /* TODO: remove? */
lastF=lastF->next=tf;
break;
}
case PUSHGLOBAL:
case STOREGLOBAL:
{
Word w;
p++;
get_word(w,p);
w=SawVar(w,at);
memcpy(p-2,&w,sizeof(w));
break;
}
case STORERECORD:
{
int n=*++p;
p++;
while (n--)
{
Word w;
at=p-code;
get_word(w,p);
w=SawStr(w,at);
memcpy(p-2,&w,sizeof(w));
}
break;
}
default:
fprintf(stderr,"luac: cannot happen: opcode=%d",*p);
exit(1);
break;
}
}
}
static void DumpWord(int i, FILE* D)
{
Word w=i;
fwrite(&w,sizeof(w),1,D);
}
static void DumpBlock(void* b, int size, FILE* D)
{
fwrite(b,size,1,D);
}
static void DumpSize(int i, FILE* D)
{
Word lo=i&0x0FFFF;
Word hi=(i>>16)&0x0FFFF;
fwrite(&hi,sizeof(hi),1,D);
fwrite(&lo,sizeof(lo),1,D);
if (hi!=0)
fprintf(stderr,
"luac: warning: code too long for 16-bit machines (%d bytes)\n",i);
}
static void DumpString(char* s, FILE* D)
{
int n=strlen(s)+1;
if ((Word)n != n)
{
fprintf(stderr,"luac: string too long: \"%.32s...\"\n",s);
exit(1);
}
DumpWord(n,D);
DumpBlock(s,n,D);
}
static void DumpStrings(FILE* D)
{
int i;
for (i=0; i<lua_ntable; i++)
{
if (VarLoc(i)!=0)
{
fputc(ID_VAR,D);
DumpWord(VarLoc(i),D);
DumpString(VarStr(i),D);
}
VarLoc(i)=i;
}
for (i=0; i<lua_nconstant; i++)
{
if (StrLoc(i)!=0)
{
fputc(ID_STR,D);
DumpWord(StrLoc(i),D);
DumpString(StrStr(i),D);
}
StrLoc(i)=i;
}
}
void DumpFunction(TFunc* tf, FILE* D)
{
lastF=tf;
ThreadCode(tf->code,tf->code+tf->size);
fputc(ID_FUN,D);
DumpSize(tf->size,D);
DumpWord(tf->lineDefined,D);
if (IsMain(tf))
DumpString(tf->fileName,D);
else
DumpWord(tf->marked,D);
DumpBlock(tf->code,tf->size,D);
DumpStrings(D);
}
void DumpHeader(FILE* D)
{
Word w=TEST_WORD;
float f=TEST_FLOAT;
fputc(ID_CHUNK,D);
fputs(SIGNATURE,D);
fputc(VERSION,D);
fputc(sizeof(Word),D);
fputc(sizeof(float),D);
fputc(sizeof(TFunc*),D);
fwrite(&w,sizeof(w),1,D);
fwrite(&f,sizeof(f),1,D);
}
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