stage2 修复全局变量未完成的问题 提供错误处理解析

stage2/ast.spl

@@ -50,6 +50,7 @@ type Body = enum {
     StatementBreak: struct { label: usize, expr: usize },
     StatementContinue: struct { label: usize },
     StatementDefer: struct { body: usize },
+    StatementErrdefer: struct { body: usize }, // errdefer：仅错误退出时执行
     StatementComptime: struct { body: usize },
     StatementDecl: struct { decl: usize },
     StatementExpr: struct { expr: usize },
@@ -87,6 +88,8 @@ type Body = enum {
     },
     ExprAggregateLit: struct { name: ByteView, fields: Vec },
     ExprComptimeCall: struct { name: ByteView, args: Vec },
+    ExprTry: struct { value: usize }, // `try expr`
+    ExprCatch: struct { value: usize, pattern: usize, handler: usize }, // `expr catch <pat> { }`
     ExprBlock: struct { stmts: Vec, tail_expr: usize },
     ExprIf: struct { cond: usize, then_block: usize, else_branch: usize },
     ExprIfvar: struct { var_decl: usize, then_block: usize, else_branch: usize },
@@ -144,6 +147,7 @@ fn kind_name(body: Body): []u8 {
         .StatementBreak(_) => { ret "statement_break"; },
         .StatementContinue(_) => { ret "statement_continue"; },
         .StatementDefer(_) => { ret "statement_defer"; },
+        .StatementErrdefer(_) => { ret "statement_errdefer"; },
         .StatementComptime(_) => { ret "statement_comptime"; },
         .ExprComptime(_) => { ret "expr_comptime"; },
         .StatementDecl(_) => { ret "statement_decl"; },
@@ -171,6 +175,8 @@ fn kind_name(body: Body): []u8 {
         .ExprArrayLit(_) => { ret "array_literal"; },
         .ExprAggregateLit(_) => { ret "aggregate_literal"; },
         .ExprComptimeCall(_) => { ret "comptime_call"; },
+        .ExprTry(_) => { ret "try_expr"; },
+        .ExprCatch(_) => { ret "catch_expr"; },
         .ExprComptimeInit(_) => { ret "comptime_init"; },
         .ExprBlock(_) => { ret "block"; },
         .ExprIf(_) => { ret "if_expr"; },
@@ -466,6 +472,7 @@ fn dump_node(ast: *Ast, buf: *ByteBuffer, stack: *Vec, ref: usize, last: bool):
         },
         .StatementContinue(x) => { ok = dump_opt(ast, buf, stack, x.label, true); },
         .StatementDefer(x) => { ok = dump_opt(ast, buf, stack, x.body, true); },
+        .StatementErrdefer(x) => { ok = dump_opt(ast, buf, stack, x.body, true); },
         .StatementComptime(x) => { ok = dump_opt(ast, buf, stack, x.body, true); },
         .ExprComptime(x) => { ok = dump_opt(ast, buf, stack, x.body, true); },
         .StatementDecl(d) => { ok = dump_opt(ast, buf, stack, d.decl, true); },
@@ -519,6 +526,12 @@ fn dump_node(ast: *Ast, buf: *ByteBuffer, stack: *Vec, ref: usize, last: bool):
         },
         .ExprAggregateLit(a) => { ok = dump_list(ast, buf, stack, a.fields); },
         .ExprComptimeCall(c) => { ok = dump_list(ast, buf, stack, c.args); },
+        .ExprTry(t2) => { ok = dump_opt(ast, buf, stack, t2.value, true); },
+        .ExprCatch(c2) => {
+            ok = dump_opt(ast, buf, stack, c2.value, false) &&
+                 dump_opt(ast, buf, stack, c2.pattern, false) &&
+                 dump_opt(ast, buf, stack, c2.handler, true);
+        },
         .ExprComptimeInit(x) => { ok = dump_list(ast, buf, stack, x.fields); },
         .ExprBlock(b) => {
             ok = dump_list(ast, buf, stack, b.stmts) &&