main.go

     1  // Copyright 2024 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"fmt"
     9  	"io"
    10  )
    11  
    12  // Wasm page size.
    13  const pageSize = 64 * 1024
    14  
    15  // Expect less than 3 MB + 1 page of memory usage for a small wasm
    16  // program. This reflects the current allocator. If the allocator
    17  // changes, update this value.
    18  const want = 3<<20 + pageSize
    19  
    20  var w = io.Discard
    21  
    22  func main() {
    23  	fmt.Fprintln(w, "hello world")
    24  
    25  	sz := uintptr(currentMemory()) * pageSize
    26  	if sz > want {
    27  		fmt.Printf("FAIL: unexpected memory size %d, want <= %d\n", sz, want)
    28  	}
    29  }
    30  
    31  func currentMemory() int32 // implemented in assembly
    32
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