int symtab_fold(symtable *tab, int current)
{
const int this_start = current;
if(tab->decls){
const int word_size = platform_word_size();
decl **diter;
int arg_offset;
arg_offset = 0;
/* need to walk backwards for args */
for(diter = tab->decls; *diter; diter++);
for(diter--; diter >= tab->decls; diter--){
sym *s = (*diter)->sym;
/*enum type_primitive last = type_int; TODO: packing */
if(s->type == sym_local && (s->decl->type->spec & (spec_extern | spec_static)) == 0){
int siz = decl_size(s->decl);
if(siz <= word_size)
s->offset = current;
else
s->offset = current + siz - word_size; /* an array and structs start at the bottom */
/* need to increase by a multiple of word_size */
if(siz % word_size)
siz += word_size - siz % word_size;
current += siz;
/* static analysis on sym (only auto-vars) */
if(s->nwrites == 0 && !decl_has_array(s->decl)){
cc1_warn_at(&s->decl->where, 0, WARN_SYM_NEVER_WRITTEN, "\"%s\" never written to", s->decl->spel);
s->nwrites++; /* only warn once */
}
}else if(s->type == sym_arg){
s->offset = arg_offset;
arg_offset += word_size;
}
}
}
{
symtable **tabi;
int subtab_max = 0;
for(tabi = tab->children; tabi && *tabi; tabi++){
int this = symtab_fold(*tabi, current);
if(this > subtab_max)
subtab_max = this;
}
tab->auto_total_size = current - this_start + subtab_max;
}
return tab->auto_total_size;
}
void gen_expr_sizeof(expr *e, symtable *stab)
{
decl *d = e->expr->tree_type;
(void)stab;
asm_temp(1, "push %d ; sizeof %s%s", decl_size(d), e->expr->expr_is_sizeof ? "type " : "", decl_to_str(d));
}
void asm_declare_decl_init(decl *d)
{
enum section_type sec;
if((d->store & STORE_MASK_STORE) == store_extern){
asm_predeclare_extern(d);
return;
}
sec = type_is_const(d->ref) ? SECTION_RODATA : SECTION_DATA;
if(d->bits.var.init.dinit && !decl_init_is_zero(d->bits.var.init.dinit)){
asm_nam_begin(sec, d);
asm_declare_init(sec, d->bits.var.init.dinit, d->ref);
asm_out_section(sec, "\n");
}else if(d->bits.var.init.compiler_generated && fopt_mode & FOPT_COMMON){
const char *common_prefix = "comm ";
/* section doesn't matter */
sec = SECTION_BSS;
if(decl_linkage(d) == linkage_internal){
if(AS_SUPPORTS_LOCAL_COMMON){
asm_out_section(sec, ".local %s\n", decl_asm_spel(d));
}else{
common_prefix = "zerofill __DATA,__bss,";
}
}
asm_out_section(sec, ".%s%s,%u,%u\n",
common_prefix,
decl_asm_spel(d), decl_size(d), decl_align(d));
}else{
/* always resB, since we use decl_size() */
asm_nam_begin(SECTION_BSS, d);
asm_reserve_bytes(SECTION_BSS, decl_size(d));
}
}
void print_decl(decl *d, enum pdeclargs mode)
{
if(mode & PDECL_INDENT)
idt_print();
if(d->store)
fprintf(cc1_out, "%s ", decl_store_to_str(d->store));
if(fopt_mode & FOPT_ENGLISH){
print_decl_eng(d);
}else{
print_type(d->ref, d);
}
if(mode & PDECL_SYM_OFFSET){
if(d->sym){
const int off = d->sym->type == sym_arg
? d->sym->loc.arg_offset
: (int)d->sym->loc.stack_pos;
fprintf(cc1_out, " (sym %s, pos = %d)",
sym_to_str(d->sym->type), off);
}else{
fprintf(cc1_out, " (no sym)");
}
}
if(mode & PDECL_SIZE && !type_is(d->ref, type_func)){
if(type_is_complete(d->ref)){
const unsigned sz = decl_size(d);
const unsigned align = decl_align(d);
fprintf(cc1_out, " size %u, align %u", sz, align);
}else{
fprintf(cc1_out, " incomplete decl");
}
}
if(mode & PDECL_NEWLINE)
fputc('\n', cc1_out);
if(!type_is(d->ref, type_func)
&& d->bits.var.init.dinit
&& mode & PDECL_PINIT)
{
gen_str_indent++;
print_decl_init(d->bits.var.init.dinit);
gen_str_indent--;
}
if(mode & PDECL_ATTR){
gen_str_indent++;
if(!type_is(d->ref, type_func) && d->bits.var.align)
idt_printf("[align={as_int=%d, resolved=%d}]\n",
d->bits.var.align->as_int, d->bits.var.align->resolved);
print_attribute(d->attr);
print_type_attr(d->ref);
gen_str_indent--;
}
if((mode & PDECL_FUNC_DESCEND) && DECL_HAS_FUNC_CODE(d)){
decl **iter;
gen_str_indent++;
for(iter = d->bits.func.code->symtab->decls; iter && *iter; iter++){
sym *s = (*iter)->sym;
if(s)
idt_printf("offset of %s = %d\n", (*iter)->spel, s->loc.stack_pos);
}
idt_printf("function stack space %d\n",
d->bits.func.code->symtab->auto_total_size);
print_stmt(d->bits.func.code);
gen_str_indent--;
}
}