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// Copyright 2014 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 debug_test
import (
"os"
"runtime"
. "runtime/debug"
"testing"
)
func TestWriteHeapDumpNonempty(t *testing.T) {
if runtime.GOOS == "js" {
t.Skipf("WriteHeapDump is not available on %s.", runtime.GOOS)
}
f, err := os.CreateTemp("", "heapdumptest")
if err != nil {
t.Fatalf("TempFile failed: %v", err)
}
defer os.Remove(f.Name())
defer f.Close()
WriteHeapDump(f.Fd())
fi, err := f.Stat()
if err != nil {
t.Fatalf("Stat failed: %v", err)
}
const minSize = 1
if size := fi.Size(); size < minSize {
t.Fatalf("Heap dump size %d bytes, expected at least %d bytes", size, minSize)
}
}
type Obj struct {
x, y int
}
func objfin(x *Obj) {
//println("finalized", x)
}
func TestWriteHeapDumpFinalizers(t *testing.T) {
if runtime.GOOS == "js" {
t.Skipf("WriteHeapDump is not available on %s.", runtime.GOOS)
}
f, err := os.CreateTemp("", "heapdumptest")
if err != nil {
t.Fatalf("TempFile failed: %v", err)
}
defer os.Remove(f.Name())
defer f.Close()
// bug 9172: WriteHeapDump couldn't handle more than one finalizer
println("allocating objects")
x := &Obj{}
runtime.SetFinalizer(x, objfin)
y := &Obj{}
runtime.SetFinalizer(y, objfin)
// Trigger collection of x and y, queueing of their finalizers.
println("starting gc")
runtime.GC()
// Make sure WriteHeapDump doesn't fail with multiple queued finalizers.
println("starting dump")
WriteHeapDump(f.Fd())
println("done dump")
}
type G[T any] struct{}
type I interface {
M()
}
//go:noinline
func (g G[T]) M() {}
var dummy I = G[int]{}
var dummy2 I = G[G[int]]{}
func TestWriteHeapDumpTypeName(t *testing.T) {
if runtime.GOOS == "js" {
t.Skipf("WriteHeapDump is not available on %s.", runtime.GOOS)
}
f, err := os.CreateTemp("", "heapdumptest")
if err != nil {
t.Fatalf("TempFile failed: %v", err)
}
defer os.Remove(f.Name())
defer f.Close()
WriteHeapDump(f.Fd())
dummy.M()
dummy2.M()
}