Iter 3: ADTs + Pattern Matching

- AST: Def::Type mit Ctors; Term::Ctor (Konstruktion) und Term::Match mit Arm/Pattern. Patterns: Wild, Var, Lit, Ctor { ctor, fields } — Sub-Patterns im MVP auf Var/Wild beschränkt. - Typchecker: Type-Registry, ctor_index für O(1)-Resolution, Pattern- Bindings, Exhaustiveness-Check gegen volle Konstruktormenge plus Negativ-Tests. - Codegen: Boxed-Heap-Layout via malloc; Tag in Offset 0, Felder ab Offset 8 in 8-Byte-Slots. Match lowert zu load tag + switch + Phi am Join. Default-Block ist unreachable, wenn vom Typchecker geprüft. - examples/list.ail.json: rekursive Int-Liste mit sum_list via match. E2E-Test + Exhaustiveness-Tests. 19/19 Tests grün. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-07 10:38:07 +02:00
parent 6e6b6a14fb
commit 21606c9340
8 changed files with 1060 additions and 8 deletions
@@ -0,0 +1,123 @@
+{
+  "schema": "ailang/v0",
+  "name": "list",
+  "imports": [],
+  "defs": [
+    {
+      "kind": "type",
+      "name": "IntList",
+      "doc": "Einfach verkettete Int-Liste, boxed.",
+      "ctors": [
+        { "name": "Nil", "fields": [] },
+        {
+          "name": "Cons",
+          "fields": [
+            { "k": "con", "name": "Int" },
+            { "k": "con", "name": "IntList" }
+          ]
+        }
+      ]
+    },
+    {
+      "kind": "fn",
+      "name": "sum_list",
+      "type": {
+        "k": "fn",
+        "params": [{ "k": "con", "name": "IntList" }],
+        "ret": { "k": "con", "name": "Int" },
+        "effects": []
+      },
+      "params": ["xs"],
+      "doc": "Summiert die Elemente einer Int-Liste rekursiv.",
+      "body": {
+        "t": "match",
+        "scrutinee": { "t": "var", "name": "xs" },
+        "arms": [
+          {
+            "pat": { "p": "ctor", "ctor": "Nil", "fields": [] },
+            "body": { "t": "lit", "lit": { "kind": "int", "value": 0 } }
+          },
+          {
+            "pat": {
+              "p": "ctor",
+              "ctor": "Cons",
+              "fields": [
+                { "p": "var", "name": "h" },
+                { "p": "var", "name": "t" }
+              ]
+            },
+            "body": {
+              "t": "app",
+              "fn": { "t": "var", "name": "+" },
+              "args": [
+                { "t": "var", "name": "h" },
+                {
+                  "t": "app",
+                  "fn": { "t": "var", "name": "sum_list" },
+                  "args": [{ "t": "var", "name": "t" }]
+                }
+              ]
+            }
+          }
+        ]
+      }
+    },
+    {
+      "kind": "fn",
+      "name": "main",
+      "type": {
+        "k": "fn",
+        "params": [],
+        "ret": { "k": "con", "name": "Unit" },
+        "effects": ["IO"]
+      },
+      "params": [],
+      "doc": "Baut [10, 20, 12] und druckt die Summe (42).",
+      "body": {
+        "t": "let",
+        "name": "xs",
+        "value": {
+          "t": "ctor",
+          "type": "IntList",
+          "ctor": "Cons",
+          "args": [
+            { "t": "lit", "lit": { "kind": "int", "value": 10 } },
+            {
+              "t": "ctor",
+              "type": "IntList",
+              "ctor": "Cons",
+              "args": [
+                { "t": "lit", "lit": { "kind": "int", "value": 20 } },
+                {
+                  "t": "ctor",
+                  "type": "IntList",
+                  "ctor": "Cons",
+                  "args": [
+                    { "t": "lit", "lit": { "kind": "int", "value": 12 } },
+                    {
+                      "t": "ctor",
+                      "type": "IntList",
+                      "ctor": "Nil",
+                      "args": []
+                    }
+                  ]
+                }
+              ]
+            }
+          ]
+        },
+        "body": {
+          "t": "do",
+          "op": "io/print_int",
+          "args": [
+            {
+              "t": "app",
+              "fn": { "t": "var", "name": "sum_list" },
+              "args": [{ "t": "var", "name": "xs" }]
+            }
+          ]
+        }
+      }
+    }
+  ]
+}