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#include "fn.h"
#include "div.h"
#include "errloc.h"
#include "gl.h"
#include "parse.h"
#include "prv.h"
#include "pr.h"
#include "stmt.h"
#include "storage.h"
#include "td.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
static int pubfn(const struct lex *l, struct prv *p);
static int prvfn(const struct lex *l, struct prv *p);
static int end(const struct lex *l, struct prv *p);
static const struct seq fnseq[] =
{
{(const struct step[])
{{ID, "function"}, {ID}, {ID, "public"}, {0}}, .fn = pubfn, .end = end},
{(const struct step[])
{{ID, "function"}, {ID}, {0}}, .fn = prvfn, .end = end},
{0}
};
static int end(const struct lex *l, struct prv *p)
{
const struct fn *fn = fn_cur(p);
if (!fn->pr)
{
const struct tk *tk = fn->tk;
errloc(tk, "function \"%s\" has no body", tk->s);
return -1;
}
return 0;
}
static const struct tk *findfn(const char *s, const struct ast *ast)
{
for (size_t i = 0; i < ast->nfns; i++)
{
const struct tk *tk = ast->fns[i].tk;
if (!strcmp(tk->s, s))
return tk;
}
return NULL;
}
static int pushfn(const struct lex *lex, struct prv *p, enum linkage l)
{
const struct tk *tk = p->stk + 1, *def;
struct ast *ast = p->ast;
size_t n = ast->nfns + 1;
struct fn *fns;
struct pos init =
{
.seq = divseq,
.stseq = divseq,
.step = divseq->steps
};
if ((def = findfn(tk->s, ast)))
{
const struct loc *loc = &def->loc;
errloc(tk, "function \"%s\" already defined at %s:%d:%d", tk->s,
loc->f, loc->line, loc->col);
return -1;
}
else if (!(fns = realloc(ast->fns, n * sizeof *fns)))
{
perror("realloc(3)");
return -1;
}
else if (push(&init, p))
return -1;
fns[ast->nfns++] = (struct fn){.linkage = l, .tk = tk};
ast->fns = fns;
p->stk = p->tk;
fprintf(stderr, "adding %s function %s\n",
l == STATIC ? "private" : "public", tk->s);
return 1;
}
static int pubfn(const struct lex *l, struct prv *p)
{
return pushfn(l, p, EXTERNAL);
}
static int prvfn(const struct lex *l, struct prv *p)
{
return pushfn(l, p, STATIC);
}
const struct stentry *fn_var(const struct fn *fn, const struct tk *tk)
{
const struct stentry *e = NULL;
const struct storage *lk = fn->lk, *ws = fn->ws, *gl = fn->gl;
if ((!lk || !(e = storage_find(tk->s, lk)))
&& (!ws || !(e = storage_find(tk->s, ws)))
&& (!gl || !(e = storage_find(tk->s, gl))))
return NULL;
return e;
}
int fn_cgen(const struct fn *fn, struct cgen *c)
{
const struct pr *pr = fn->pr;
const struct param *ret = pr->ret;
if (fn->gl && gl_cgen(fn->gl, c))
return -1;
switch (fn->linkage)
{
case STATIC:
printf("function ");
break;
case EXTERNAL:
printf("export function ");
break;
}
if (ret)
printf("%s ", cgen_abity(ret->entry->t));
printf("$%s(", fn->tk->s);
for (size_t i = 0; i < pr->nparams; i++)
{
const struct param *p = &pr->params[i];
printf(" %s", cgen_abity(p->entry->t));
printf(" %%%s_ ", p->tk->s);
if (i + 1 < pr->nparams)
fputs(", ", stdout);
}
puts(") {\n@start");
for (size_t i = 0; i < fn->nstmts; i++)
if (stmt_cgen(&fn->stmts[i], c))
return -1;
fputs("ret", stdout);
if (pr->ret)
fputs(" %__ret", stdout);
puts("\n}");
return 0;
}
void fn_cgen_free(struct fn_cgen *c)
{
free(c);
}
void fn_free(struct fn *fn)
{
for (size_t i = 0; i < fn->nstmts; i++)
stmt_free(&fn->stmts[i]);
storage_free(fn->lk);
storage_free(fn->ws);
storage_free(fn->gl);
pr_free(fn->pr);
td_free(fn->td);
free(fn->stmts);
}
struct fn *fn_cur(const struct prv *p)
{
struct ast *ast = p->ast;
return &ast->fns[p->ast->nfns - 1];
}
int fn(const struct lex *l, struct prv *p)
{
struct pos init =
{
.seq = fnseq,
.stseq = fnseq,
.step = fnseq->steps
};
if (push(&init, p))
return -1;
p->stk = p->tk;
return 1;
}
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