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#include "call.h"
#include "dbg.h"
#include "errloc.h"
#include "fn.h"
#include "lex.h"
#include "lit.h"
#include "parse.h"
#include "pr.h"
#include "prv.h"
#include "stmt.h"
#include "sym.h"
#include "type.h"
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int using(const struct lex *, struct prv *);
static int s_returning(const struct lex *, struct prv *);
static const struct seq returning =
{(struct step[]){{ID, "returning"}, {0}}, .fn = s_returning};
static const struct seq seqs[] =
{
{(struct step[]){{ID, "using"}, {0}}, .fn = using},
returning,
{0}
};
static const struct seq useqs[] =
{
returning,
{0}
};
static int param(const struct lex *l, struct prv *p, const struct sym *s)
{
struct stmt *stmt = stmt_cur(p);
struct call *c = &stmt->u.call;
size_t n = c->nparams + 1;
struct callparam *params = realloc(c->params, n * sizeof *params);
if (!params)
{
perror("realloc(3)");
return -1;
}
params[c->nparams++] = (struct callparam){.s = s};
c->params = params;
return 0;
}
static int using(const struct lex *l, struct prv *p)
{
struct pos init =
{
.name = __func__,
.seq = useqs
};
struct stmt *stmt = stmt_cur(p);
struct call *c = &stmt->u.call;
const struct tk *tk = c->pr->tk, *u = c->using;
if (u)
{
const struct loc *loc = &u->loc;
errloc(p->stk, "\"using\" for \"%s\" already set at %d:%d", tk->s,
loc->line, loc->col);
return -1;
}
else if (push(&init, p))
return -1;
c->using = p->stk;
return sym(p, param);
}
static int setret(const struct lex *l, struct prv *p, const struct sym *s)
{
struct stmt *stmt = stmt_cur(p);
struct call *c = &stmt->u.call;
c->ret = s;
return pop(l, p);
}
static int s_returning(const struct lex *l, struct prv *p)
{
struct pos init =
{
.name = __func__,
.seq = useqs
};
struct stmt *stmt = stmt_cur(p);
struct call *c = &stmt->u.call;
const struct tk *tk = c->pr->tk, *r = c->returning;
if (r)
{
const struct loc *loc = &r->loc;
errloc(p->stk, "\"returning\" for \"%s\" already set at %d:%d",
tk->s, loc->line, loc->col);
return -1;
}
if (push(&init, p))
return -1;
c->returning = p->stk;
return sym(p, setret);
}
static int endcall(const struct lex *l, struct prv *p)
{
const struct stmt *stmt = stmt_cur(p);
const struct call *c = &stmt->u.call;
const struct pr *pr = c->pr;
const struct tk *tk = c->id->tk;
size_t n = c->nparams;
if (!pr)
{
errloc(p->stk - 1, "incomplete \"call\" statement");
return -1;
}
else if (c->using && !n)
{
errloc(c->using, "\"using\" without arguments");
return -1;
}
else if (c->returning && !c->ret)
{
errloc(c->using, "\"returning\" without return variable");
return -1;
}
else if (pr->variadic)
{
if (n < pr->nparams)
{
errloc(tk, "\"%s\" expects at least %zu parameters, "
"but %zu were given", tk->s, pr->nparams, n);
return -1;
}
}
else if (n != pr->nparams)
{
errloc(tk, "\"%s\" expects %zu parameters, but %zu were given",
tk->s, pr->nparams, n);
return -1;
}
if (!pr->ret && c->ret)
{
errloc(tk, "function \"%s\" does not expect any return variable",
tk->s);
return -1;
}
fprintf(stderr, "%s: TODO\n", __func__);
return -1;
}
void call_free(struct call *c)
{
if (c)
free(c->params);
}
static const struct pr *find(const struct ast *ast, const char *s)
{
for (size_t i = 0; i < ast->nfns; i++)
{
const struct fn *fn = &ast->fns[i];
if (!strcmp(fn->tk->s, s))
return fn->pr;
}
return NULL;
}
static int onsym(const struct lex *l, struct prv *p, const struct sym *s)
{
const struct fn *fn = fn_cur(p);
struct stmt *stmt = stmt_cur(p);
struct call *c = &stmt->u.call;
const struct tk *tk = s->tk;
const struct pr *pr = find(p->ast, tk->s);
const struct stentry *e;
if (pr)
c->pr = pr;
else if (!(e = fn_var(fn, tk)))
{
errloc(tk, "undefined reference to \"%s\"", tk->s);
return -1;
}
else if (e->t->type != P)
{
char *tn = type_name(e->t);
if (tn)
errloc(tk, "cannot call \"%s\" with type \"%s\"", tk->s, tn);
free(tn);
return -1;
}
else
c->pr = e->t->u.p.fn->pr;
c->id = s;
return pop(l, p);
}
int call(const struct lex *l, struct prv *p)
{
struct pos init =
{
.name = __func__,
.seq = seqs,
.end = endcall,
};
struct fn *fn = fn_cur(p);
size_t n = fn->nstmts + 1;
struct stmt *stmts = realloc(fn->stmts, n * sizeof *stmts);
if (!stmts)
{
perror("realloc(3)");
return -1;
}
stmts[fn->nstmts++] = (struct stmt){.type = CALL, .u.call.tk = p->stk};
fn->stmts = stmts;
if (push(&init, p))
return -1;
return sym(p, onsym);
}
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