Initial commit: Go 1.23 release state

test/arenas/smoke.go

@@ -0,0 +1,65 @@
+// build -goexperiment arenas
+
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"arena"
+	"log"
+	"reflect"
+)
+
+func main() {
+	a := arena.NewArena()
+	defer a.Free()
+
+	const iValue = 10
+
+	i := arena.New[int](a)
+	*i = iValue
+
+	if *i != iValue {
+		// This test doesn't reasonably expect this to fail. It's more likely
+		// that *i crashes for some reason. Still, why not check it.
+		log.Fatalf("bad i value: got %d, want %d", *i, iValue)
+	}
+
+	const wantLen = 125
+	const wantCap = 1912
+
+	sl := arena.MakeSlice[*int](a, wantLen, wantCap)
+	if len(sl) != wantLen {
+		log.Fatalf("bad arena slice length: got %d, want %d", len(sl), wantLen)
+	}
+	if cap(sl) != wantCap {
+		log.Fatalf("bad arena slice capacity: got %d, want %d", cap(sl), wantCap)
+	}
+	sl = sl[:cap(sl)]
+	for j := range sl {
+		sl[j] = i
+	}
+	for j := range sl {
+		if *sl[j] != iValue {
+			// This test doesn't reasonably expect this to fail. It's more likely
+			// that sl[j] crashes for some reason. Still, why not check it.
+			log.Fatalf("bad sl[j] value: got %d, want %d", *sl[j], iValue)
+		}
+	}
+
+	t := reflect.TypeOf(int(0))
+	v := reflect.ArenaNew(a, t)
+	if want := reflect.PointerTo(t); v.Type() != want {
+		log.Fatalf("unexpected type for arena-allocated value: got %s, want %s", v.Type(), want)
+	}
+	i2 := v.Interface().(*int)
+	*i2 = iValue
+
+	if *i2 != iValue {
+		// This test doesn't reasonably expect this to fail. It's more likely
+		// that *i crashes for some reason. Still, why not check it.
+		log.Fatalf("bad i2 value: got %d, want %d", *i2, iValue)
+	}
+}