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feat: in/out 参数 — out 关键字引用传递

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fn swap(out x: i64, out y: i64) 声明 out 参数，codegen 层面
函数签名变为 T* 指针，调用点自动传 &variable 地址。
in 是默认行为（值传递），无需显式标注。

Token → Parser → Sema → Codegen 全流水线:
- TOK_OUT + "out" 关键字注册
- AST parameter.is_out 字段
- parse_function 解析 out 前缀
- Sema: out 参数注册为 SYM_VARIABLE+is_mut（可赋值）
- Codegen: LLVM 函数签名使用 T*，调用点传 alloca

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
刘航宇
2026-06-07 14:45:38 +08:00
parent 0a0667776a
commit c8da286d31
14 changed files with 162 additions and 28 deletions
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test/test_codegen.c
+7 -7
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@@ -129,8 +129,8 @@ void test_codegen_struct_decl() {
/* 构造 AST: struct Point { x: i64, y: i64 } */
AstNode* fields[2];
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, loc_at(1, 1));
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, false, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, false, loc_at(1, 1));
AstNode* struct_decl = ast_make_struct_decl(&a, "Point", fields, 2, loc_at(1, 1));
AstNode* structs[] = { struct_decl };
@@ -185,8 +185,8 @@ void test_codegen_struct_field_access() {
/* 构造 AST: struct Point { x: i64, y: i64 } */
AstNode* fields[2];
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, loc_at(1, 1));
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, false, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, false, loc_at(1, 1));
AstNode* struct_decl = ast_make_struct_decl(&a, "Point", fields, 2, loc_at(1, 1));
AstNode* structs[] = { struct_decl };
@@ -356,13 +356,13 @@ void test_codegen_method_call() {
/* struct Point { x: i64, y: i64 } */
AstNode* fields[2];
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, loc_at(1, 1));
fields[0] = ast_make_parameter(&a, "x", TYPE_I64, NULL, false, loc_at(1, 1));
fields[1] = ast_make_parameter(&a, "y", TYPE_I64, NULL, false, loc_at(1, 1));
AstNode* struct_decl = ast_make_struct_decl(&a, "Point", fields, 2, loc_at(1, 1));
AstNode* structs[] = { struct_decl };
/* fn Point$get_x(self: Point) -> i64 { return self.x; } */
AstNode* self_param = ast_make_parameter(&a, "self", TYPE_STRUCT, "Point", loc_at(1, 1));
AstNode* self_param = ast_make_parameter(&a, "self", TYPE_STRUCT, "Point", false, loc_at(1, 1));
AstNode* params[] = { self_param };
AstNode* self_ident = ast_make_ident(&a, "self", loc_at(1, 1));
self_ident->type.kind = TYPE_STRUCT;