gc: extend optimized mode to maps (#10426)

vlib/builtin/map.v

@@ -338,7 +338,7 @@ fn new_map(key_bytes int, value_bytes int, hash_fn MapHashFn, key_eq_fn MapEqFn,
 		cached_hashbits: max_cached_hashbits
 		shift: init_log_capicity
 		key_values: new_dense_array(key_bytes, value_bytes)
-		metas: unsafe { &u32(vcalloc(metasize)) }
+		metas: unsafe { &u32(vcalloc_noscan(metasize)) }
 		extra_metas: extra_metas_inc
 		len: 0
 		has_string_keys: has_string_keys

vlib/builtin/map_d_gcboehm_opt.v

@@ -0,0 +1,146 @@
+// "noscan" versions of `map` initialization routines
+//
+// They are used when the compiler can proof that either the keys or the values or both
+// do not contain any pointers. Such objects can be placed in a memory area that is not
+// scanned by the garbage collector
+
+module builtin
+
+[inline]
+fn new_dense_array_noscan(key_bytes int, key_noscan bool, value_bytes int, value_noscan bool) DenseArray {
+	cap := 8
+	keys := if key_noscan {
+		unsafe { malloc_noscan(cap * key_bytes) }
+	} else {
+		unsafe { malloc(cap * key_bytes) }
+	}
+	values := if value_noscan {
+		unsafe { malloc_noscan(cap * value_bytes) }
+	} else {
+		unsafe { malloc(cap * value_bytes) }
+	}
+	return DenseArray{
+		key_bytes: key_bytes
+		value_bytes: value_bytes
+		cap: cap
+		len: 0
+		deletes: 0
+		all_deleted: 0
+		keys: keys
+		values: values
+	}
+}
+
+fn new_map_noscan_key(key_bytes int, value_bytes int, hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn) map {
+	metasize := int(sizeof(u32) * (init_capicity + extra_metas_inc))
+	// for now assume anything bigger than a pointer is a string
+	has_string_keys := key_bytes > sizeof(voidptr)
+	return map{
+		key_bytes: key_bytes
+		value_bytes: value_bytes
+		even_index: init_even_index
+		cached_hashbits: max_cached_hashbits
+		shift: init_log_capicity
+		key_values: new_dense_array_noscan(key_bytes, true, value_bytes, false)
+		metas: unsafe { &u32(vcalloc_noscan(metasize)) }
+		extra_metas: extra_metas_inc
+		len: 0
+		has_string_keys: has_string_keys
+		hash_fn: hash_fn
+		key_eq_fn: key_eq_fn
+		clone_fn: clone_fn
+		free_fn: free_fn
+	}
+}
+
+fn new_map_noscan_value(key_bytes int, value_bytes int, hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn) map {
+	metasize := int(sizeof(u32) * (init_capicity + extra_metas_inc))
+	// for now assume anything bigger than a pointer is a string
+	has_string_keys := key_bytes > sizeof(voidptr)
+	return map{
+		key_bytes: key_bytes
+		value_bytes: value_bytes
+		even_index: init_even_index
+		cached_hashbits: max_cached_hashbits
+		shift: init_log_capicity
+		key_values: new_dense_array_noscan(key_bytes, false, value_bytes, true)
+		metas: unsafe { &u32(vcalloc_noscan(metasize)) }
+		extra_metas: extra_metas_inc
+		len: 0
+		has_string_keys: has_string_keys
+		hash_fn: hash_fn
+		key_eq_fn: key_eq_fn
+		clone_fn: clone_fn
+		free_fn: free_fn
+	}
+}
+
+fn new_map_noscan_key_value(key_bytes int, value_bytes int, hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn) map {
+	metasize := int(sizeof(u32) * (init_capicity + extra_metas_inc))
+	// for now assume anything bigger than a pointer is a string
+	has_string_keys := key_bytes > sizeof(voidptr)
+	return map{
+		key_bytes: key_bytes
+		value_bytes: value_bytes
+		even_index: init_even_index
+		cached_hashbits: max_cached_hashbits
+		shift: init_log_capicity
+		key_values: new_dense_array_noscan(key_bytes, true, value_bytes, true)
+		metas: unsafe { &u32(vcalloc_noscan(metasize)) }
+		extra_metas: extra_metas_inc
+		len: 0
+		has_string_keys: has_string_keys
+		hash_fn: hash_fn
+		key_eq_fn: key_eq_fn
+		clone_fn: clone_fn
+		free_fn: free_fn
+	}
+}
+
+fn new_map_init_noscan_key(hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn, n int, key_bytes int, value_bytes int, keys voidptr, values voidptr) map {
+	mut out := new_map_noscan_key(key_bytes, value_bytes, hash_fn, key_eq_fn, clone_fn,
+		free_fn)
+	// TODO pre-allocate n slots
+	mut pkey := &byte(keys)
+	mut pval := &byte(values)
+	for _ in 0 .. n {
+		unsafe {
+			out.set(pkey, pval)
+			pkey = pkey + key_bytes
+			pval = pval + value_bytes
+		}
+	}
+	return out
+}
+
+fn new_map_init_noscan_value(hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn, n int, key_bytes int, value_bytes int, keys voidptr, values voidptr) map {
+	mut out := new_map_noscan_value(key_bytes, value_bytes, hash_fn, key_eq_fn, clone_fn,
+		free_fn)
+	// TODO pre-allocate n slots
+	mut pkey := &byte(keys)
+	mut pval := &byte(values)
+	for _ in 0 .. n {
+		unsafe {
+			out.set(pkey, pval)
+			pkey = pkey + key_bytes
+			pval = pval + value_bytes
+		}
+	}
+	return out
+}
+
+fn new_map_init_noscan_key_value(hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn, n int, key_bytes int, value_bytes int, keys voidptr, values voidptr) map {
+	mut out := new_map_noscan_key_value(key_bytes, value_bytes, hash_fn, key_eq_fn, clone_fn,
+		free_fn)
+	// TODO pre-allocate n slots
+	mut pkey := &byte(keys)
+	mut pval := &byte(values)
+	for _ in 0 .. n {
+		unsafe {
+			out.set(pkey, pval)
+			pkey = pkey + key_bytes
+			pval = pval + value_bytes
+		}
+	}
+	return out
+}