go source for verification 2026-05-22

test/wasmmemsize.dir/asm_wasm.s

@@ -0,0 +1,11 @@
+// Copyright 2024 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.
+
+#include "textflag.h"
+
+TEXT ·currentMemory(SB), NOSPLIT, $0
+	Get SP
+	CurrentMemory
+	I32Store ret+0(FP)
+	RET

test/wasmmemsize.dir/main.go

@@ -0,0 +1,31 @@
+// Copyright 2024 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 (
+	"fmt"
+	"io"
+)
+
+// Wasm page size.
+const pageSize = 64 * 1024
+
+// Expect less than 3 MB + 1 page of memory usage for a small wasm
+// program. This reflects the current allocator. If the allocator
+// changes, update this value.
+const want = 3<<20 + pageSize
+
+var w = io.Discard
+
+func main() {
+	fmt.Fprintln(w, "hello world")
+
+	sz := uintptr(currentMemory()) * pageSize
+	if sz > want {
+		fmt.Printf("FAIL: unexpected memory size %d, want <= %d\n", sz, want)
+	}
+}
+
+func currentMemory() int32 // implemented in assembly