vtables, protocol

src/ast.zig

@@ -64,6 +64,7 @@ pub const Node = struct {
         break_expr: void,
         continue_expr: void,
         undef_literal: void,
+        inferred_type: void,
         builtin_expr: void,
         foreign_expr: ForeignExpr,
         library_decl: LibraryDecl,
@@ -73,6 +74,8 @@ pub const Node = struct {
         tuple_literal: TupleLiteral,
         ufcs_alias: UfcsAlias,
         c_import_decl: CImportDecl,
+        protocol_decl: ProtocolDecl,
+        impl_block: ImplBlock,
 
         pub fn declName(self: Data) ?[]const u8 {
             return switch (self) {
@@ -85,6 +88,7 @@ pub const Node = struct {
                 .namespace_decl => |d| d.name,
                 .ufcs_alias => |d| d.name,
                 .c_import_decl => |d| d.name,
+                .protocol_decl => |d| d.name,
                 else => null,
             };
         }
@@ -274,6 +278,7 @@ pub const UnionDecl = struct {
 pub const StructTypeParam = struct {
     name: []const u8, // e.g. "N" or "T" (without $)
     constraint: *Node, // type_expr: "u32" for value param, "Type" for type param
+    protocol_constraints: []const []const u8 = &.{}, // e.g. ["Eq", "Hashable"] for $T/Eq/Hashable
 };
 
 pub const UsingEntry = struct {
@@ -288,6 +293,7 @@ pub const StructDecl = struct {
     field_defaults: []const ?*Node, // default value per field, null if none
     type_params: []const StructTypeParam = &.{},
     using_entries: []const UsingEntry = &.{},
+    methods: []const *Node = &.{}, // fn_decl nodes for struct methods
 };
 
 pub const StructFieldInit = struct {
@@ -311,6 +317,7 @@ pub const Lambda = struct {
 pub const TypeExpr = struct {
     name: []const u8,
     is_generic: bool = false,
+    protocol_constraints: []const []const u8 = &.{}, // e.g. ["Eq", "Hashable"] for $T/Eq/Hashable
 };
 
 pub const DeferStmt = struct {
@@ -465,3 +472,24 @@ pub const CImportDecl = struct {
     name: ?[]const u8 = null,
     bitcode_paths: []const []const u8 = &.{}, // populated during import resolution
 };
+
+pub const ProtocolMethodDecl = struct {
+    name: []const u8,
+    params: []const *Node, // type_expr nodes for parameter types (excluding implicit self)
+    param_names: []const []const u8, // parameter names (excluding implicit self)
+    return_type: ?*Node, // null = void return
+    default_body: ?*Node, // null = required method, non-null = default implementation
+};
+
+pub const ProtocolDecl = struct {
+    name: []const u8,
+    methods: []const ProtocolMethodDecl,
+    is_inline: bool = false, // #inline — embedded fn ptrs instead of vtable pointer
+};
+
+pub const ImplBlock = struct {
+    protocol_name: []const u8,
+    target_type: []const u8,
+    target_type_params: []const StructTypeParam = &.{}, // for `impl P for List($T)`
+    methods: []const *Node, // fn_decl nodes
+};