-/****************************************
-
- SPILL SLOT MANAGEMENT AND OPTS
-
-****************************************/
-
-typedef struct _spill_slot_t {
- unsigned size;
- unsigned align;
- pset *members;
- ir_mode *largest_mode; /* the mode of all members with largest size */
-} spill_slot_t;
-
-typedef struct _ss_env_t {
- struct obstack ob;
- be_chordal_env_t *cenv;
- pmap *slots; /* maps spill_contexts to spill_slots */
- pmap *types; /* maps modes to types */
- DEBUG_ONLY(firm_dbg_module_t *dbg;)
-} ss_env_t;
-
-
-/**
- * Walker: compute the spill slots
- */
-static void compute_spill_slots_walker(ir_node *spill, void *env) {
- ss_env_t *ssenv = env;
- ir_node *ctx;
- pmap_entry *entry;
- spill_slot_t *ss;
-
- if (!be_is_Spill(spill))
- return;
-
- /* check, if this spill is for a context already known */
- ctx = be_get_Spill_context(spill);
- entry = pmap_find(ssenv->slots, ctx);
-
- if (!entry) {
- struct _arch_env_t *arch_env = ssenv->cenv->birg->main_env->arch_env;
- const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, spill, be_pos_Spill_val);
- ir_mode *largest_mode = arch_register_class_mode(cls);
-
- /* this is a new spill context */
- ss = obstack_alloc(&ssenv->ob, sizeof(*ss));
- ss->members = pset_new_ptr(8);
- ss->largest_mode = largest_mode;
- ss->size = get_mode_size_bytes(ss->largest_mode);
- ss->align = arch_isa_get_reg_class_alignment(arch_env->isa, cls);
- pmap_insert(ssenv->slots, ctx, ss);
- } else {
- /* values with the same spill_ctx must go into the same spill slot */
- ss = entry->value;
-
-#ifndef NDEBUG
- /* ugly mega assert :-) */
- {
- ir_node *irn;
- struct _arch_env_t *arch_env = ssenv->cenv->birg->main_env->arch_env;
- const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, spill, be_pos_Spill_val);
- int size = get_mode_size_bytes(arch_register_class_mode(cls));
- assert((int) ss->size == size && "Different sizes for the same spill slot are not allowed.");
- for (irn = pset_first(ss->members); irn; irn = pset_next(ss->members)) {
- /* use values_interfere here, because it uses the dominance check,
- which does work for values in memory */
- assert(!values_interfere(spill, irn) && "Spills for the same spill slot must not interfere!");
- }
- }
-#endif /* NDEBUG */
- }
-
- pset_insert_ptr(ss->members, spill);