ref: 9f76a7f6819ac04552b4fb6588156f3e4089d1d7
dir: /utils/rcsh/code.c/
#include "rc.h"
#include "y.tab.h"
#define c0 t->child[0]
#define c1 t->child[1]
#define c2 t->child[2]
#define emitf(x) ((codep!=ncode || morecode()), codebuf[codep].f=(x), codep++)
#define emiti(x) ((codep!=ncode || morecode()), codebuf[codep].i=(x), codep++)
#define emits(x) ((codep!=ncode || morecode()), codebuf[codep].s=(x), codep++)
void stuffdot(int);
char *fnstr(Tree*);
void outcode(Tree*, int);
void codeswitch(Tree*, int);
int iscase(Tree*);
Code *codecopy(Code*);
void codefree(Code*);
int codep, ncode;
Code *codebuf;
int
morecode(void)
{
ncode+=100;
codebuf=realloc(codebuf, ncode*sizeof codebuf[0]);
if(codebuf==0)
panic("Can't realloc %d bytes in morecode!",
ncode*sizeof codebuf[0]);
return 0; /* not used */
}
void
stuffdot(int a)
{
if(a<0 || codep<=a) panic("Bad address %d in stuffdot", a);
codebuf[a].i=codep;
}
int
compile(Tree *t)
{
ncode=100;
codebuf=malloc(ncode*sizeof codebuf[0]);
codep=0;
emiti(0); /* reference count */
outcode(t, flag['e']?1:0);
if(nerror){
free(codebuf);
return 0;
}
/* readhere(); */
emitf(Xreturn);
emitf(0);
return 1;
}
void
cleanhere(char *f)
{
emitf(Xdelhere);
emits(strdup(f));
}
char *
fnstr(Tree *t)
{
Io *f=openstr();
char *v;
extern char nl;
char svnl=nl;
nl=';';
pfmt(f, "%t", t);
nl=svnl;
v=f->strp;
f->strp=0;
closeio(f);
return v;
}
void
outcode(Tree *t, int eflag)
{
int p, q;
Tree *tt;
if(t==0)
return;
if(t->type != NOT && t->type != ';')
runq->iflast=0;
switch(t->type){
default:
pfmt(err, "bad type %d in outcode\n", t->type);
break;
case '$':
emitf(Xmark);
outcode(c0, eflag);
emitf(Xdol);
break;
case '"':
emitf(Xmark);
outcode(c0, eflag);
emitf(Xqdol);
break;
case SUB:
emitf(Xmark);
outcode(c0, eflag);
emitf(Xmark);
outcode(c1, eflag);
emitf(Xsub);
break;
case '&':
emitf(Xasync);
emits(fnstr(c0));
/*
p=emiti(0);
outcode(c0, eflag);
emitf(Xexit);
stuffdot(p);
*/
break;
case ';':
outcode(c0, eflag);
outcode(c1, eflag);
break;
case '^':
emitf(Xmark);
outcode(c1, eflag);
emitf(Xmark);
outcode(c0, eflag);
emitf(Xconc);
break;
case '`':
emitf(Xbackq);
emits(fnstr(c0));
/*
p=emiti(0);
outcode(c0, 0);
emitf(Xexit);
stuffdot(p);
*/
break;
case ANDAND:
outcode(c0, 0);
emitf(Xtrue);
p=emiti(0);
outcode(c1, eflag);
stuffdot(p);
break;
case ARGLIST:
outcode(c1, eflag);
outcode(c0, eflag);
break;
case BANG:
outcode(c0, eflag);
emitf(Xbang);
break;
case PCMD:
case BRACE:
outcode(c0, eflag);
break;
case COUNT:
emitf(Xmark);
outcode(c0, eflag);
emitf(Xcount);
break;
case FN:
emitf(Xmark);
outcode(c0, eflag);
if(c1){
emitf(Xfn);
p=emiti(0);
emits(fnstr(c1));
outcode(c1, eflag);
emitf(Xunlocal); /* get rid of $* */
emitf(Xreturn);
stuffdot(p);
}
else
emitf(Xdelfn);
break;
case IF:
outcode(c0, 0);
emitf(Xif);
p=emiti(0);
outcode(c1, eflag);
emitf(Xwastrue);
stuffdot(p);
break;
case NOT:
if(!runq->iflast) yyerror("`if not' does not follow `if(...)'");
emitf(Xifnot);
p=emiti(0);
outcode(c0, eflag);
stuffdot(p);
break;
case OROR:
outcode(c0, 0);
emitf(Xfalse);
p=emiti(0);
outcode(c1, eflag);
stuffdot(p);
break;
case PAREN:
outcode(c0, eflag);
break;
case SIMPLE:
emitf(Xmark);
outcode(c0, eflag);
emitf(Xsimple);
if(eflag) emitf(Xeflag);
break;
case SUBSHELL:
emitf(Xsubshell);
emits(fnstr(c0));
/*
p=emiti(0);
outcode(c0, eflag);
emitf(Xexit);
stuffdot(p);
*/
if(eflag) emitf(Xeflag);
break;
case SWITCH:
codeswitch(t, eflag);
break;
case TWIDDLE:
emitf(Xmark);
outcode(c1, eflag);
emitf(Xmark);
outcode(c0, eflag);
emitf(Xmatch);
if(eflag) emitf(Xeflag);
break;
case WHILE:
q=codep;
emitf(Xsettrue);
outcode(c0, 0);
emitf(Xtrue);
p=emiti(0);
outcode(c1, eflag);
emitf(Xjump);
emiti(q);
stuffdot(p);
break;
case WORDS:
outcode(c1, eflag);
outcode(c0, eflag);
break;
case FOR:
emitf(Xmark);
if(c1){
outcode(c1, eflag);
emitf(Xglob);
}
else{
emitf(Xmark);
emitf(Xword);
emits(strdup("*"));
emitf(Xdol);
}
emitf(Xmark); /* dummy value for Xlocal */
emitf(Xmark);
outcode(c0, eflag);
emitf(Xlocal);
p=emitf(Xfor);
q=emiti(0);
outcode(c2, eflag);
emitf(Xjump);
emiti(p);
stuffdot(q);
emitf(Xunlocal);
break;
case WORD:
emitf(Xword);
emits(strdup(t->str));
break;
case DUP:
if(t->rtype==DUPFD) {
emitf(Xdup);
emiti(t->fd0);
emiti(t->fd1);
} else { /* t->rtype == CLOSE */
emitf(Xclose);
emiti(t->fd0);
}
outcode(c1, eflag);
emitf(Xpopredir);
break;
/*
case PIPEFD:
emitf(Xpipefd);
emiti(t->rtype);
p=emiti(0);
outcode(c0, eflag);
emitf(Xexit);
stuffdot(p);
break;
*/
case REDIR:
emitf(Xmark);
outcode(c0, eflag);
emitf(Xglob);
switch(t->rtype){
case APPEND:
emitf(Xappend);
break;
case WRITE:
emitf(Xwrite);
break;
case READ:
case HERE:
emitf(Xread);
break;
}
emiti(t->fd0);
outcode(c1, eflag);
emitf(Xpopredir);
break;
case '=':
tt=t;
for(;t && t->type=='=';t=c2)
;
if(t){
for(t=tt;t->type=='=';t=c2){
emitf(Xmark);
outcode(c1, eflag);
emitf(Xmark);
outcode(c0, eflag);
emitf(Xlocal);
}
t=tt;
outcode(c2, eflag);
for(;t->type=='=';t=c2)
emitf(Xunlocal);
}
else{
for(t=tt;t;t=c2){
emitf(Xmark);
outcode(c1, eflag);
emitf(Xmark);
outcode(c0, eflag);
emitf(Xassign);
}
}
t=tt; /* so tests below will work */
break;
case PIPE:
emitf(Xpipe);
emiti(t->fd0);
emiti(t->fd1);
emits(fnstr(c0));
q=emiti(0);
/*
outcode(c0, eflag);
emitf(Xexit);
stuffdot(p);
*/
outcode(c1, eflag);
emitf(Xreturn);
stuffdot(q);
emitf(Xpipewait);
break;
}
if(t->type!=NOT && t->type!=';')
runq->iflast=t->type==IF;
else if(c0) runq->iflast=c0->type==IF;
}
/*
* switch code looks like this:
* Xmark
* (get switch value)
* Xjump 1f
* out: Xjump leave
* 1: Xmark
* (get case values)
* Xcase 1f
* (commands)
* Xjump out
* 1: Xmark
* (get case values)
* Xcase 1f
* (commands)
* Xjump out
* 1:
* leave:
* Xpopm
*/
void
codeswitch(Tree *t, int eflag)
{
int leave; /* patch jump address to leave switch */
int out; /* jump here to leave switch */
int nextcase; /* patch jump address to next case */
Tree *tt;
if(c1->child[0]->type!=';'
|| !iscase(c1->child[0]->child[0])){
yyerror("case missing in switch");
return;
}
emitf(Xmark);
outcode(c0, eflag);
emitf(Xjump);
nextcase=emiti(0);
out=emitf(Xjump);
leave=emiti(0);
stuffdot(nextcase);
t=c1->child[0];
while(t->type==';'){
tt=c1;
emitf(Xmark);
for(t=c0->child[0];t->type==ARGLIST;t=c0) outcode(c1, eflag);
emitf(Xcase);
nextcase=emiti(0);
t=tt;
for(;;){
if(t->type==';'){
if(iscase(c0)) break;
outcode(c0, eflag);
t=c1;
}
else{
outcode(t, eflag);
break;
}
}
emitf(Xjump);
emiti(out);
stuffdot(nextcase);
}
stuffdot(leave);
emitf(Xpopm);
}
int
iscase(Tree *t)
{
if(t->type!=SIMPLE)
return 0;
do
t=c0;
while(t->type==ARGLIST);
return t->type==WORD && !t->quoted && strcmp(t->str, "case")==0;
}
Code *
codecopy(Code *cp)
{
cp[0].i++;
return cp;
}
void
codefree(Code *cp)
{
Code *p;
if(--cp[0].i!=0)
return;
for(p=cp+1;p->f;){
if(p->f==Xappend || p->f==Xclose || p->f==Xread || p->f==Xwrite
|| p->f==Xasync || p->f==Xcase || p->f==Xfalse
|| p->f==Xfor || p->f==Xjump
|| p->f==Xsubshell || p->f==Xtrue)
p+=2;
else if(p->f==Xdup || p->f==Xpipefd)
p+=3;
else if(p->f==Xpipe) {
free(p[3].s);
p+=5;
} else if(p->f==Xword || p->f==Xdelhere || p->f==Xbackq) {
free(p[1].s);
p+=2;
} else if(p->f==Xfn){
free(p[2].s);
p+=3;
} else
p++;
}
free(cp);
}