Begin work on implementing the new map internals

core/runtime/core.odin

@@ -394,9 +394,32 @@ Raw_Dynamic_Array :: struct {
 	allocator: Allocator,
 }
 
+// The raw, type-erased representation of a map.
+//
+// 32-bytes on 64-bit
+// 16-bytes on 32-bit
 Raw_Map :: struct {
-	hashes:  []Map_Index,
-	entries: Raw_Dynamic_Array,
+	// A single allocation spanning all keys, values, and hashes.
+	// {
+	//   k: Map_Cell(K) * (capacity / ks_per_cell)
+	//   v: Map_Cell(V) * (capacity / vs_per_cell)
+	//   h: Map_Cell(H) * (capacity / hs_per_cell)
+	// }
+	//
+	// The data is allocated assuming 64-byte alignment, meaning the address is
+	// always a multiple of 64. This means we have 6 bits of zeros in the pointer
+	// to store the capacity. We can store a value as large as 2^6-1 or 63 in
+	// there. This conveniently is the maximum log2 capacity we can have for a map
+	// as Odin uses signed integers to represent capacity.
+	//
+	// Since the hashes are backed by Map_Hash, which is just a 64-bit unsigned
+	// integer, the cell structure for hashes is unnecessary because 64/8 is 8 and
+	// requires no padding, meaning it can be indexed as a regular array of
+	// Map_Hash directly, though for consistency sake it's written as if it were
+	// an array of Map_Cell(Map_Hash).
+	data:      uintptr,   // 8-bytes on 64-bits, 4-bytes on 32-bits
+	len:       uintptr,   // 8-bytes on 64-bits, 4-bytes on 32-bits
+	allocator: Allocator, // 16-bytes on 64-bits, 8-bytes on 32-bits
 }
 
 Raw_Any :: struct {

core/runtime/core_builtin.odin

@@ -159,20 +159,7 @@ delete_slice :: proc(array: $T/[]$E, allocator := context.allocator, loc := #cal
 }
 @builtin
 delete_map :: proc(m: $T/map[$K]$V, loc := #caller_location) -> Allocator_Error {
-	Entry :: struct {
-		hash:  uintptr,
-		next:  int,
-		key:   K,
-		value: V,
-	}
-
-	raw := transmute(Raw_Map)m
-	err := delete_slice(raw.hashes, raw.entries.allocator, loc)
-	err1 := mem_free_with_size(raw.entries.data, raw.entries.cap*size_of(Entry), raw.entries.allocator, loc)
-	if err == nil {
-		err = err1
-	}
-	return err
+	return map_free(transmute(Raw_Map)m, loc)
 }
 
 
@@ -285,19 +272,13 @@ clear_map :: proc "contextless" (m: ^$T/map[$K]$V) {
 	if m == nil {
 		return
 	}
-	raw_map := (^Raw_Map)(m)
-	entries := (^Raw_Dynamic_Array)(&raw_map.entries)
-	entries.len = 0
-	for _, i in raw_map.hashes {
-		raw_map.hashes[i] = MAP_SENTINEL
-	}
+	map_clear_dynamic((^Raw_Map)(m), map_info(K, V))
 }
 
 @builtin
 reserve_map :: proc(m: ^$T/map[$K]$V, capacity: int, loc := #caller_location) {
 	if m != nil {
-		h := __get_map_header_table(T)
-		__dynamic_map_reserve(m, h, uint(capacity), loc)
+		__dynamic_map_reserve((^Raw_Map)(m), map_info(K, V), uint(capacity), loc)
 	}
 }
 
@@ -325,15 +306,9 @@ shrink_map :: proc(m: ^$T/map[$K]$V, new_cap := -1, loc := #caller_location) ->
 delete_key :: proc(m: ^$T/map[$K]$V, key: K) -> (deleted_key: K, deleted_value: V) {
 	if m != nil {
 		key := key
-		h := __get_map_header(m)
-		fr := __map_find(h, &key)
-		if fr.entry_index != MAP_SENTINEL {
-			entry := __dynamic_map_get_entry(h, fr.entry_index)
-			deleted_key   = (^K)(uintptr(entry)+h.key_offset)^
-			deleted_value = (^V)(uintptr(entry)+h.value_offset)^
-
-			__dynamic_map_erase(h, fr)
-		}
+		info := map_info(K, V)
+		_ =  map_erase_dynamic((^Raw_Map)(m), info, uintptr(&key))
+		// TODO(bill) old key and value
 	}
 	return
 }