static void check_implicit_funcall(expr *e, symtable *stab, char **const psp)
{
struct symtab_entry ent;
funcargs *args;
decl *df, *owning_func;
type *func_ty;
if(e->expr->in_parens
|| !expr_kind(e->expr, identifier)
/* not folded yet, hence no 'e->expr->bits.ident.type != IDENT_NORM' */
/* get the spel that parse stashes in the identifier expr: */
|| !((*psp) = e->expr->bits.ident.bits.ident.spel))
{
return;
}
/* check for implicit function */
if(symtab_search(stab, *psp, NULL, &ent)
&& ent.type == SYMTAB_ENT_DECL)
{
e->expr->bits.ident.bits.ident.sym = ent.bits.decl->sym;
return;
}
args = funcargs_new();
/* set up the funcargs as if it's "x()" - i.e. any args */
funcargs_empty(args);
func_ty = type_func_of(
type_nav_btype(cc1_type_nav, type_int),
args,
symtab_new(stab, &e->where) /*new symtable for args*/);
cc1_warn_at(&e->expr->where, implicit_func,
"implicit declaration of function \"%s\"", *psp);
df = decl_new();
memcpy_safe(&df->where, &e->where);
df->ref = func_ty;
df->spel = e->expr->bits.ident.bits.ident.spel;
df->flags |= DECL_FLAGS_IMPLICIT;
fold_decl(df, stab); /* update calling conv, for e.g. */
df->sym->type = sym_global;
e->expr->bits.ident.bits.ident.sym = df->sym;
e->expr->tree_type = func_ty;
owning_func = symtab_func(stab);
if(owning_func)
symtab_insert_before(symtab_root(stab), owning_func, df);
else
symtab_add_to_scope(symtab_root(stab), df); /* function call at global scope */
}
void fold_expr_funcall(expr *e, symtable *stab)
{
decl *df;
funcargs *args_exp;
if(expr_kind(e->expr, identifier) && e->expr->spel){
char *const sp = e->expr->spel;
e->sym = symtab_search(stab, sp);
if(!e->sym){
df = decl_new_where(&e->where);
df->type->primitive = type_int;
df->type->spec |= spec_extern;
cc1_warn_at(&e->where, 0, WARN_IMPLICIT_FUNC, "implicit declaration of function \"%s\"", sp);
df->spel = sp;
df->funcargs = funcargs_new();
if(e->funcargs)
/* set up the funcargs as if it's "x()" - i.e. any args */
function_empty_args(df->funcargs);
e->sym = symtab_add(symtab_root(stab), df, sym_global, SYMTAB_WITH_SYM, SYMTAB_PREPEND);
}else{
df = e->sym->decl;
}
fold_expr(e->expr, stab);
}else{
fold_expr(e->expr, stab);
/*
* convert int (*)() to remove the deref
*/
if(decl_is_func_ptr(e->expr->tree_type)){
/* XXX: memleak */
e->expr = e->expr->lhs;
fprintf(stderr, "FUNCPTR\n");
}else{
fprintf(stderr, "decl %s\n", decl_to_str(e->expr->tree_type));
}
df = e->expr->tree_type;
if(!decl_is_callable(df)){
die_at(&e->expr->where, "expression %s (%s) not callable",
e->expr->f_str(),
decl_to_str(df));
}
}
e->tree_type = decl_copy(df);
/*
* int (*x)();
* (*x)();
* evaluates to tree_type = int;
*/
decl_func_deref(e->tree_type);
if(e->funcargs){
expr **iter;
for(iter = e->funcargs; *iter; iter++)
fold_expr(*iter, stab);
}
/* func count comparison, only if the func has arg-decls, or the func is f(void) */
args_exp = decl_funcargs(e->tree_type);
UCC_ASSERT(args_exp, "no funcargs for decl %s", df->spel);
if(args_exp->arglist || args_exp->args_void){
expr **iter_arg;
decl **iter_decl;
int count_decl, count_arg;
count_decl = count_arg = 0;
for(iter_arg = e->funcargs; iter_arg && *iter_arg; iter_arg++, count_arg++);
for(iter_decl = args_exp->arglist; iter_decl && *iter_decl; iter_decl++, count_decl++);
if(count_decl != count_arg && (args_exp->variadic ? count_arg < count_decl : 1)){
die_at(&e->where, "too %s arguments to function %s (got %d, need %d)",
count_arg > count_decl ? "many" : "few",
df->spel, count_arg, count_decl);
}
if(e->funcargs){
funcargs *argument_decls = funcargs_new();
for(iter_arg = e->funcargs; *iter_arg; iter_arg++)
dynarray_add((void ***)&argument_decls->arglist, (*iter_arg)->tree_type);
fold_funcargs_equal(args_exp, argument_decls, 1, &e->where, "argument", df->spel);
funcargs_free(argument_decls, 0);
}
}
}
