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#include "call.h"
#include "errloc.h"
#include "fn.h"
#include "lex.h"
#include "parse.h"
#include "prv.h"
#include "stmt.h"
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int callpr(const struct lex *l, struct prv *p);
static int callp(const struct lex *l, struct prv *p);
static int callr(const struct lex *l, struct prv *p);
static int callv(const struct lex *l, struct prv *p);
static const struct seq seqs[] =
{
{(const struct step[]){
{ID},
{ID, "with"},
{ID, NULL, 1},
{ID, "returning"},
{ID},
{0}}, .fn = callpr},
{(const struct step[]){
{ID},
{ID, "with"},
{ID, NULL, 1},
{0}}, .fn = callp},
{(const struct step[]){
{ID},
{ID, "returning"},
{ID},
{0}}, .fn = callr},
{(const struct step[]){
{ID},
{0}}, .fn = callv},
{0}
};
static int param(const struct lex *l, struct prv *p, const struct tk *tk,
struct call *c)
{
const struct fn *fn = fn_cur(p);
const struct stentry *e = fn_var(fn, tk);
size_t n = c->nparams + 1;
struct callparam *params;
if (!e)
{
errloc(tk, "undefined reference to parameter \"%s\"", tk->s);
return -1;
}
else if (!(params = realloc(c->params, n * sizeof *params)))
{
perror("realloc(3)");
return -1;
}
c->params = params;
c->params[c->nparams++] = (struct callparam){.entry = e};
return 0;
}
static int callpr(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->stk + 2;
struct call *c = &stmt_cur(p)->u.call;
const struct pr *pr = c->pr;
const struct stentry *e;
size_t n = 0;
while (!kw((tk++)->s))
n++;
if (n != pr->nparams)
{
tk -= 2;
errloc(tk, "function \"%s\" expects %zu parameters, "
"but %zu were given", c->tk->s, pr->nparams, n);
return -1;
}
else if (!pr->ret)
{
errloc(tk, "function \"%s\" does not expect any return variable",
c->tk->s);
return -1;
}
tk = p->stk + 2;
for (size_t i = 0; i < n; i++)
if (param(l, p, tk++, c))
return -1;
if (!(e = fn_var(fn_cur(p), ++tk)))
{
errloc(tk, "undefined reference to return variable \"%s\"",
tk->s);
return -1;
}
else if (pop(l, p))
return -1;
fprintf(stderr, "\t\tadding call to %s with %zu params "
"and %s as return variable\n", c->tk->s, n, tk->s);
c->ret = e;
c->nparams = n;
p->stk = ++tk;
return 1;
}
static int callr(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->stk + 2;
const struct fn *fn = fn_cur(p);
const struct stentry *e;
struct call *c = &stmt_cur(p)->u.call;
const struct pr *pr = c->pr;
if (!pr->ret)
{
errloc(tk, "function \"%s\" does not expect any return variable",
c->tk->s);
return -1;
}
else if (pr->nparams)
{
errloc(tk, "function \"%s\" expects %zu parameters, "
"but none were given", c->tk->s, pr->nparams);
return -1;
}
else if (!(e = fn_var(fn, tk)))
{
errloc(tk, "undefined reference to return variable \"%s\"",
tk->s);
return -1;
}
else if (pop(l, p))
return -1;
fprintf(stderr, "\t\tadding call to %s with %s as return variable\n",
c->tk->s, tk->s);
c->ret = e;
p->stk = ++tk;
return 1;
}
static int callp(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->stk + 2;
struct call *c = &stmt_cur(p)->u.call;
const struct pr *pr = c->pr;
size_t n = 0;
while (!kw((tk++)->s))
n++;
if (pr->nparams != n)
{
errloc(tk, "function \"%s\" expects %zu parameters, "
"but %zu were given", c->tk->s, pr->nparams, n);
return -1;
}
tk = p->stk + 2;
for (size_t i = 0; i < n; i++)
if (param(l, p, tk++, c))
return -1;
if (pop(l, p))
return -1;
fprintf(stderr, "\t\tadding call to %s with 1 param\n", c->tk->s);
p->stk = tk;
return 1;
}
static int callv(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->stk;
struct call *c = &stmt_cur(p)->u.call;
const struct pr *pr = c->pr;
if (pr->nparams)
{
errloc(tk, "function \"%s\" expects %zu parameters, "
"but none were given", c->tk->s, pr->nparams);
return -1;
}
else if (pop(l, p))
return -1;
fprintf(stderr, "\t\tadding call to %s with %s as return variable\n",
c->tk->s, tk->s);
p->stk = ++tk;
return 1;
}
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;
}
int call_cgen(const struct call *m, struct cgen *c)
{
const struct stentry *ret = m->ret;
if (ret)
printf("%%r =%s ", cgen_sz(ret->t->sz));
printf("call $%s(", m->tk->s);
for (size_t i = 0; i < m->nparams; i++)
{
const struct callparam *cp = &m->params[i];
const struct stentry *e = cp->entry;
const char *name = e->tk->s;
printf("%s ", cgen_sz(e->t->sz));
if (cgen_global(c->fn, e))
printf("$%s", name);
else
printf("%%%s_", name);
if (i + 1 < m->nparams)
fputs(", ", stdout);
}
puts(")");
if (ret)
{
const char *name = ret->tk->s;
const struct fn *fn = c->fn;
const struct param *fnret = fn->pr->ret;
size_t sz = ret->t->sz;
if (cgen_global(c->fn, ret))
printf("store%s %%r, $%s", cgen_sz(sz), name);
else if (fnret && fnret->entry == ret)
printf("%%__ret =%s add %%r, 0", cgen_abity(ret->t));
else
printf("%%%s_ =%s add %%r, 0", name, cgen_abity(ret->t));
putchar('\n');
}
return 0;
}
void call_free(struct call *c)
{
if (c)
free(c->params);
}
int call(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->tk;
const struct pr *pr;
struct fn *fn = fn_cur(p);
size_t n = fn->nstmts +1;
struct stmt *stmts;
struct pos init =
{
.seq = seqs,
.stseq = seqs,
.step = seqs->steps
};
/* TODO: function pointers */
if (lex_eof(l, tk))
{
errloc(tk - 1, "incomplete call statement");
return -1;
}
else if (!(pr = find(p->ast, tk->s)))
{
errloc(tk, "undefined reference to function \"%s\"", tk->s);
return -1;
}
else if (!(stmts = realloc(fn->stmts, n * sizeof *stmts)))
{
perror("realloc(3)");
return -1;
}
fn->stmts = stmts;
fn->stmts[fn->nstmts++] = (struct stmt)
{
.type = CALL,
.u.call =
{
.tk = tk,
.pr = pr
}
};
if (push(&init, p))
return -1;
p->stk = p->tk;
return 1;
}
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