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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.h>
#include "apl9.h"
Symtab *globalsymtab;
Symtab *newsymtab(void);
void freesymtab(Symtab *);
Datum *getalpha(void);
Datum *getomega(void);
Datum *getalphao(void);
Datum *getomegao(void);
void setalpha(Datum *);
void setsyntaxerr(Datum *);
Symbol *
getsym(Rune *name, int fresh)
{
ThreadData *td = getthreaddata();
DfnFrame *dfn = td->currentdfn;
Symtab *tab;
int done = 0;
do{
if(dfn != nil)
tab = dfn->symtab;
else
tab = globalsymtab;
for(int i = 0; i < tab->nsyms; i++){
if(runestrcmp(tab->syms[i]->name, name) == 0)
return tab->syms[i];
}
if(dfn)
dfn = dfn->prev;
else
done = 1;
}while(!done && !fresh);
/* make sure to allocate in the most local scope if the symbol is not found */
if(td->currentdfn)
tab = td->currentdfn->symtab;
tab->nsyms++;
tab->syms = erealloc(tab->syms, sizeof(Symbol *) * tab->nsyms);
tab->syms[tab->nsyms-1] = emalloc(sizeof(Symbol));
tab->syms[tab->nsyms-1]->name = runestrdup(name);
tab->syms[tab->nsyms-1]->undefined = 1;
tab->syms[tab->nsyms-1]->getfn = nil;
tab->syms[tab->nsyms-1]->setfn = nil;
return tab->syms[tab->nsyms-1];
}
Symtab *
newsymtab(void)
{
Symtab *tab = emalloc(sizeof(Symtab));
tab->nsyms = 0;
tab->syms = nil;
tab->io = globalIO();
tab->div = globalDIV();
return tab;
}
void
freesymtab(Symtab *tab)
{
int i;
for(i = 0; i < tab->nsyms; i++){
Symbol *s = tab->syms[i];
if(s->undefined == 0)
freedatum(s->value);
free(s->name);
}
free(tab->syms);
free(tab);
}
void
initsymtab(void)
{
globalsymtab = newsymtab();
Symbol *s;
s = getsym(L"⍺", 1);
s->getfn = getalpha;
s->setfn = setalpha;
s->undefined = 0;
s = getsym(L"⍵", 1);
s->getfn = getomega;
s->setfn = setsyntaxerr;
s->undefined = 0;
s = getsym(L"⍶", 1);
s->getfn = getalphao;
s->setfn = setsyntaxerr;
s->undefined = 0;
s = getsym(L"⍹", 1);
s->getfn = getomegao;
s->setfn = setsyntaxerr;
s->undefined = 0;
}
DfnFrame *
getcurrentdfn(void)
{
ThreadData *td = getthreaddata();
return td->currentdfn;
}
DfnFrame *
pushdfnframe(Rune *code, Datum *lefto, Datum *righto, Array *left, Array *right)
{
ThreadData *td = getthreaddata();
DfnFrame *new = emalloc(sizeof(DfnFrame));
new->code = code;
new->symtab = newsymtab();
new->lefto = lefto;
new->righto = righto;
if(lefto)
incdatumref(lefto);
if(righto)
incdatumref(righto);
if(left){
new->left = allocdatum(ArrayTag, 0);
new->left->array = left;
incarrayref(left);
}else
new->left = nil;
new->right = right;
incarrayref(right);
new->prev = td->currentdfn;
td->currentdfn = new;
return new;
}
void
popdfnframe(void)
{
ThreadData *td = getthreaddata();
if(td->currentdfn != nil){
DfnFrame *prev = td->currentdfn->prev;
freesymtab(td->currentdfn->symtab);
freedatum(td->currentdfn->lefto);
freedatum(td->currentdfn->righto);
freedatum(td->currentdfn->left);
freearray(td->currentdfn->right);
free(td->currentdfn);
td->currentdfn = prev;
}
}
vlong
globalIO(void)
{
ThreadData *td = getthreaddata();
if(td->currentdfn)
return td->currentdfn->symtab->io;
else if(globalsymtab)
return globalsymtab->io;
else
return 1;
}
void
globalIOset(vlong io)
{
ThreadData *td = getthreaddata();
if(td->currentdfn)
td->currentdfn->symtab->io = io;
else
globalsymtab->io = io;
}
int
globalDIV(void)
{
ThreadData *td = getthreaddata();
if(td->currentdfn)
return td->currentdfn->symtab->div;
else if(globalsymtab)
return globalsymtab->div;
else
return 0;
}
void
globalDIVset(int div)
{
ThreadData *td = getthreaddata();
if(td->currentdfn)
td->currentdfn->symtab->div = div;
else
globalsymtab->div = div;
}
/* getters and setters for ⍺⍵⍶⍹ */
Datum *
getalpha(void)
{
DfnFrame *dfn = getcurrentdfn();
Datum *res = nil;
if(dfn == nil || dfn->left == nil)
throwerror(nil, ESyntax);
else{
res = dfn->left;
incdatumref(res);
}
return res;
}
Datum *
getomega(void)
{
DfnFrame *dfn = getcurrentdfn();
Datum *res = nil;
if(dfn == nil || dfn->right == nil)
throwerror(nil, ESyntax);
else{
res = allocdatum(ArrayTag, 0);
res->array = dfn->right;
incarrayref(res->array);
}
return res;
}
Datum *
getalphao(void)
{
DfnFrame *dfn = getcurrentdfn();
Datum *res = nil;
if(dfn == nil || dfn->lefto == nil)
throwerror(nil, ESyntax);
else{
res = dfn->lefto;
incdatumref(res);
}
return res;
}
Datum *
getomegao(void)
{
DfnFrame *dfn = getcurrentdfn();
Datum *res = nil;
if(dfn == nil || dfn->righto == nil)
throwerror(nil, ESyntax);
else{
res = dfn->righto;
incdatumref(res);
}
return res;
}
void
setalpha(Datum *new)
{
DfnFrame *dfn = getcurrentdfn();
if(dfn == nil)
throwerror(nil, ESyntax);
if(dfn->left == nil){
dfn->left = new;
incdatumref(new);
}
}
void
setsyntaxerr(Datum *)
{
throwerror(nil, ESyntax);
}
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