void gen_expr_funcall(expr *e, symtable *stab)
{
const char *const fname = e->expr->spel;
expr **iter;
int nargs = 0;
if(fopt_mode & FOPT_ENABLE_ASM && fname && !strcmp(fname, ASM_INLINE_FNAME)){
const char *str;
expr *arg1;
int i;
if(!e->funcargs || e->funcargs[1] || !expr_kind(e->funcargs[0], addr))
die_at(&e->where, "invalid __asm__ arguments");
arg1 = e->funcargs[0];
str = arg1->array_store->data.str;
for(i = 0; i < arg1->array_store->len - 1; i++){
char ch = str[i];
if(!isprint(ch) && !isspace(ch))
invalid:
die_at(&arg1->where, "invalid __asm__ string (character %d)", ch);
}
if(str[i])
goto invalid;
asm_temp(0, "; start manual __asm__");
fprintf(cc_out[SECTION_TEXT], "%s\n", arg1->array_store->data.str);
asm_temp(0, "; end manual __asm__");
}else{
/* continue with normal funcall */
if(e->funcargs){
/* need to push on in reverse order */
for(iter = e->funcargs; *iter; iter++);
for(iter--; iter >= e->funcargs; iter--){
gen_expr(*iter, stab);
nargs++;
}
}
if(e->sym && !e->sym->decl->decl_ptr && e->sym->decl->spel){
/* simple */
asm_temp(1, "call %s", e->sym->decl->spel);
}else{
gen_expr(e->expr, stab);
asm_temp(1, "pop rax ; function address");
asm_temp(1, "call rax ; duh");
}
if(nargs)
asm_temp(1, "add rsp, %d ; %d arg%s",
nargs * platform_word_size(),
nargs,
nargs == 1 ? "" : "s");
asm_temp(1, "push rax ; ret");
}
}
unsigned decl_size(decl *d)
{
if(type_is_void(d->ref))
die_at(&d->where, "%s is void", d->spel);
if(!type_is(d->ref, type_func) && d->bits.var.field_width)
die_at(&d->where, "can't take size of a bitfield");
return type_size(d->ref, &d->where);
}
unsigned type_size(type *r, const where *from)
{
switch(r->type){
case type_auto:
ICE("__auto_type");
case type_btype:
return btype_size(r->bits.type, from);
case type_tdef:
{
decl *d = r->bits.tdef.decl;
type *sub;
if(d)
return type_size(d->ref, from);
sub = r->bits.tdef.type_of->tree_type;
UCC_ASSERT(sub, "type_size for unfolded typedef");
return type_size(sub, from);
}
case type_attr:
case type_cast:
case type_where:
return type_size(r->ref, from);
case type_ptr:
case type_block:
return platform_word_size();
case type_func:
/* function size is one, sizeof(main) is valid */
return 1;
case type_array:
{
integral_t sz;
if(type_is_void(r->ref))
die_at(from, "array of void");
if(!r->bits.array.size)
die_at(from, "array has an incomplete size");
sz = const_fold_val_i(r->bits.array.size);
return sz * type_size(r->ref, from);
}
}
ucc_unreach(0);
}
void fold_expr_addr(expr *e, symtable *stab)
{
if(e->bits.lbl.spel){
decl *in_func = symtab_func(stab);
if(!in_func)
die_at(&e->where, "address-of-label outside a function");
if(e->bits.lbl.static_ctx)
in_func->bits.func.contains_static_label_addr = 1;
(e->bits.lbl.label =
symtab_label_find_or_new(
stab, e->bits.lbl.spel, &e->where))
->uses++;
/* address of label - void * */
e->tree_type = type_ptr_to(type_nav_btype(cc1_type_nav, type_void));
}else{
/* if it's an identifier, act as a read */
fold_inc_writes_if_sym(e->lhs, stab);
fold_expr_nodecay(e->lhs, stab);
e->tree_type = type_ptr_to(e->lhs->tree_type);
/* can address: lvalues, arrays and functions */
if(!expr_is_addressable(e->lhs)){
warn_at_print_error(&e->where, "can't take the address of %s (%s)",
expr_str_friendly(e->lhs), type_to_str(e->lhs->tree_type));
fold_had_error = 1;
return;
}
if(expr_kind(e->lhs, identifier)){
sym *sym = e->lhs->bits.ident.bits.ident.sym;
if(sym){
decl *d = sym->decl;
if((d->store & STORE_MASK_STORE) == store_register)
die_at(&e->lhs->where, "can't take the address of register");
}
}
fold_check_expr(e->lhs, FOLD_CHK_ALLOW_VOID | FOLD_CHK_NO_BITFIELD,
"address-of");
}
}
static attribute *parse_attr_section(symtable *symtab, const char *ident)
{
/* __attribute__((section ("sectionname"))) */
attribute *da;
char *func;
size_t len, i;
(void)symtab;
(void)ident;
EAT(token_open_paren);
if(curtok != token_string)
die_at(NULL, "string expected for section");
token_get_current_str(&func, &len, NULL, NULL);
EAT(token_string);
for(i = 0; i < len; i++)
if(!isprint(func[i])) {
if(i < len - 1 || func[i] != '\0')
cc1_warn_at(NULL, attr_section_badchar,
"character 0x%x detected in section", func[i]);
break;
}
da = attribute_new(attr_section);
da->bits.section = func;
EAT(token_close_paren);
return da;
}
static attribute *parse_attr_cleanup(symtable *scope, const char *ident)
{
char *sp;
where ident_loc;
attribute *attr = NULL;
struct symtab_entry ent;
(void)ident;
EAT(token_open_paren);
if(curtok != token_identifier)
die_at(NULL, "identifier expected for cleanup function");
where_cc1_current(&ident_loc);
sp = token_current_spel();
EAT(token_identifier);
if(symtab_search(scope, sp, NULL, &ent) && ent.type == SYMTAB_ENT_DECL) {
attr = attribute_new(attr_cleanup);
attr->bits.cleanup = ent.bits.decl;
} else {
warn_at_print_error(&ident_loc, "function '%s' not found", sp);
fold_had_error = 1;
}
EAT(token_close_paren);
return attr;
}
void token_get_current_str(
char **ps, size_t *pl, int *pwide, where *w)
{
extern char *currentstring;
extern size_t currentstringlen;
extern int currentstringwide;
*ps = currentstring;
if(pwide)
*pwide = currentstringwide;
else if(currentstringwide)
die_at(NULL, "wide string not wanted");
if(w){
extern where currentstringwhere;
memcpy_safe(w, ¤tstringwhere);
}
if(pl){
*pl = currentstringlen;
}else{
char *p = memchr(currentstring, '\0', currentstringlen);
if(p && p < currentstring + currentstringlen - 1)
cc1_warn_at(NULL, str_contain_nul,
"nul-character terminates string early (%s)", p + 1);
}
currentstring = NULL;
currentstringlen = 0;
}
void flow_fold(stmt_flow *flow, symtable **pstab)
{
if(flow){
decl **i;
*pstab = flow->for_init_symtab;
fold_shadow_dup_check_block_decls(*pstab);
/* sanity check on _flow_ vars only */
for(i = symtab_decls(*pstab); i && *i; i++){
decl *const d = *i;
switch((enum decl_storage)(d->store & STORE_MASK_STORE)){
case store_auto:
case store_default:
case store_register:
break;
default:
die_at(&d->where, "%s variable in statement-initialisation",
decl_store_to_str(d->store));
}
/* block decls/for-init decls must be complete */
fold_check_decl_complete(d);
if(d->bits.var.init.expr)
FOLD_EXPR(d->bits.var.init.expr, *pstab);
}
}
}
static void sentinel_check(where *w, expr *e, expr **args,
const int variadic, const int nstdargs, symtable *stab)
{
#define ATTR_WARN_RET(w, ...) \
do{ cc1_warn_at(w, attr_sentinel, __VA_ARGS__); return; }while(0)
attribute *attr = func_or_builtin_attr_present(e, attr_sentinel);
int i, nvs;
expr *sentinel;
if(!attr)
return;
if(!variadic)
return; /* warning emitted elsewhere, on the decl */
if(attr->bits.sentinel){
consty k;
FOLD_EXPR(attr->bits.sentinel, stab);
const_fold(attr->bits.sentinel, &k);
if(k.type != CONST_NUM || !K_INTEGRAL(k.bits.num))
die_at(&attr->where, "sentinel attribute not reducible to integer constant");
i = k.bits.num.val.i;
}else{
i = 0;
}
nvs = dynarray_count(args) - nstdargs;
if(nvs == 0)
ATTR_WARN_RET(w, "not enough variadic arguments for a sentinel");
UCC_ASSERT(nvs >= 0, "too few args");
if(i >= nvs)
ATTR_WARN_RET(w, "sentinel index is not a variadic argument");
sentinel = args[(nstdargs + nvs - 1) - i];
/* must be of a pointer type, printf("%p\n", 0) is undefined */
if(!expr_is_null_ptr(sentinel, NULL_STRICT_ANY_PTR))
ATTR_WARN_RET(&sentinel->where, "sentinel argument expected (got %s)",
type_to_str(sentinel->tree_type));
#undef ATTR_WARN_RET
}
void fold_stmt_goto(stmt *s)
{
if(!symtab_func(s->symtab))
die_at(&s->where, "goto outside of a function");
if(s->expr){
FOLD_EXPR(s->expr, s->symtab);
}else{
(s->bits.lbl.label =
symtab_label_find_or_new(
s->symtab, s->bits.lbl.spel, &s->where))
->uses++;
dynarray_add(&s->bits.lbl.label->jumpers, s);
}
}
void fold_stmt_case_range(stmt *s)
{
integral_t lv, rv;
FOLD_EXPR(s->expr, s->symtab);
FOLD_EXPR(s->expr2, s->symtab);
fold_check_expr(s->expr,
FOLD_CHK_INTEGRAL | FOLD_CHK_CONST_I,
"case-range");
lv = const_fold_val_i(s->expr);
fold_check_expr(s->expr2,
FOLD_CHK_INTEGRAL | FOLD_CHK_CONST_I,
"case-range");
rv = const_fold_val_i(s->expr2);
if(lv >= rv)
die_at(&s->where, "case range equal or inverse");
s->bits.case_lbl = out_label_case(CASE_RANGE, lv);
fold_stmt_and_add_to_curswitch(s, &s->bits.case_lbl);
}
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);
}
}
}
void fold_expr_struct(expr *e, symtable *stab)
{
/*
* lhs = any ptr-to-struct expr
* rhs = struct member ident
*/
const int ptr_expect = !e->expr_is_st_dot;
struct_union_enum_st *sue;
char *spel;
fold_expr_no_decay(e->lhs, stab);
/* don't fold the rhs - just a member name */
if(e->rhs){
UCC_ASSERT(expr_kind(e->rhs, identifier),
"struct/union member not identifier (%s)", e->rhs->f_str());
UCC_ASSERT(!e->bits.struct_mem.d, "already have a struct-member");
spel = e->rhs->bits.ident.spel;
}else{
UCC_ASSERT(e->bits.struct_mem.d, "no member specified already?");
spel = NULL;
}
/* we access a struct, of the right ptr depth */
{
type *r = e->lhs->tree_type;
if(ptr_expect){
type *rtest = type_is(r, type_ptr);
if(!rtest && !(rtest = type_is(r, type_array)))
goto err;
r = rtest->ref; /* safe - rtest is an array */
}
if(!(sue = type_is_s_or_u(r))){
err:
die_at(&e->lhs->where, "'%s' (%s-expr) is not a %sstruct or union (member %s)",
type_to_str(e->lhs->tree_type),
e->lhs->f_str(),
ptr_expect ? "pointer to " : "",
spel);
}
}
if(!sue_complete(sue)){
char wbuf[WHERE_BUF_SIZ];
die_at(&e->lhs->where, "%s incomplete type (%s)\n"
"%s: note: forward declared here",
ptr_expect
? "dereferencing pointer to"
: "accessing member of",
type_to_str(e->lhs->tree_type),
where_str_r(wbuf, &sue->where));
}
if(spel){
/* found the struct, find the member */
decl *d_mem = struct_union_member_find(sue, spel,
&e->bits.struct_mem.extra_off, NULL);
if(!d_mem)
die_at(&e->where, "%s %s has no member named \"%s\"",
sue_str(sue), sue->spel, spel);
e->rhs->tree_type = (e->bits.struct_mem.d = d_mem)->ref;
}/* else already have the member */
/*
* if it's a.b, convert to (&a)->b for asm gen
* e = { lhs = "a", rhs = "b", type = dot }
* e = {
* type = ptr,
* lhs = { cast<void *>, expr = { expr = "a", type = addr } },
* rhs = "b",
* }
*/
if(!ptr_expect){
expr *cast, *addr;
addr = expr_new_addr(e->lhs);
cast = expr_new_cast(addr,
type_ptr_to(type_nav_btype(cc1_type_nav, type_void)),
1);
e->lhs = cast;
e->expr_is_st_dot = 0;
FOLD_EXPR(e->lhs, stab);
}
/* pull qualifiers from the struct to the member */
e->tree_type = type_qualify(
e->bits.struct_mem.d->ref,
type_qual(e->lhs->tree_type));
}