add bit_field parsing to core:odin/parser

Also adds it to the core type thingy like it is in the compiler.

core/odin/ast/ast.odin

@@ -617,7 +617,7 @@ field_flag_strings := [Field_Flag]string{
 	.Any_Int            = "#any_int",
 	.Subtype            = "#subtype",
 	.By_Ptr             = "#by_ptr",
-	.No_Broadcast       ="#no_broadcast",
+	.No_Broadcast       = "#no_broadcast",
 
 	.Results            = "results",
 	.Tags               = "field tag",
@@ -842,6 +842,23 @@ Matrix_Type :: struct {
 	elem:         ^Expr,
 }
 
+Bit_Field_Type :: struct {
+	using node:   Expr,
+	tok_pos:      tokenizer.Pos,
+	backing_type: ^Expr,
+	open:         tokenizer.Pos,
+	fields:       []^Bit_Field_Field,
+	close:        tokenizer.Pos,
+}
+
+Bit_Field_Field :: struct {
+	using node: Node,
+	docs:       ^Comment_Group,
+	name:       ^Expr,
+	type:       ^Expr,
+	bit_size:   ^Expr,
+	comments:   ^Comment_Group,
+}
 
 Any_Node :: union {
 	^Package,
@@ -898,6 +915,7 @@ Any_Node :: union {
 	^Map_Type,
 	^Relative_Type,
 	^Matrix_Type,
+	^Bit_Field_Type,
 
 	^Bad_Stmt,
 	^Empty_Stmt,
@@ -928,6 +946,7 @@ Any_Node :: union {
 	^Attribute,
 	^Field,
 	^Field_List,
+	^Bit_Field_Field,
 }
 
 
@@ -982,6 +1001,7 @@ Any_Expr :: union {
 	^Map_Type,
 	^Relative_Type,
 	^Matrix_Type,
+	^Bit_Field_Type,
 }
 
 

core/odin/ast/clone.odin

@@ -336,6 +336,13 @@ clone_node :: proc(node: ^Node) -> ^Node {
 		case ^Relative_Type:
 			r.tag = clone(r.tag)
 			r.type = clone(r.type)
+		case ^Bit_Field_Type:
+			r.backing_type = clone(r.backing_type)
+			r.fields       = auto_cast clone(r.fields)
+		case ^Bit_Field_Field:
+			r.name     = clone(r.name)
+			r.type     = clone(r.type)
+			r.bit_size = clone(r.bit_size)
 		case:
 			fmt.panicf("Unhandled node kind: %v", r)
 		}

core/odin/ast/walk.odin

@@ -414,7 +414,15 @@ walk :: proc(v: ^Visitor, node: ^Node) {
 		walk(v, n.row_count)
 		walk(v, n.column_count)
 		walk(v, n.elem)
-
+	case ^Bit_Field_Type:
+		walk(v, n.backing_type)
+		for f in n.fields {
+			walk(v, f)
+		}
+	case ^Bit_Field_Field:
+		walk(v, n.name)
+		walk(v, n.type)
+		walk(v, n.bit_size)
 	case:
 		fmt.panicf("ast.walk: unexpected node type %T", n)
 	}