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// Copyright 2020 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 ld
import (
"path/filepath"
"runtime"
"testing"
)
// TestMMap ensures that we can actually mmap on every supported platform.
func TestMMap(t *testing.T) {
switch runtime.GOOS {
default:
t.Skip("unsupported OS")
case "aix", "darwin", "ios", "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "windows":
}
dir := t.TempDir()
filename := filepath.Join(dir, "foo.out")
ob := NewOutBuf(nil)
if err := ob.Open(filename); err != nil {
t.Fatalf("error opening file: %v", err)
}
defer ob.Close()
if err := ob.Mmap(1 << 20); err != nil {
t.Errorf("error mmapping file %v", err)
}
if !ob.isMmapped() {
t.Errorf("should be mmapped")
}
}
// TestWriteLoc ensures that the math surrounding writeLoc is correct.
func TestWriteLoc(t *testing.T) {
tests := []struct {
bufLen int
off int64
heapLen int
lenToWrite int64
expectedHeapLen int
writePos int64
addressInHeap bool
}{
{100, 0, 0, 100, 0, 0, false},
{100, 100, 0, 100, 100, 0, true},
{10, 10, 0, 100, 100, 0, true},
{10, 20, 10, 100, 110, 10, true},
{0, 0, 0, 100, 100, 0, true},
}
for i, test := range tests {
ob := &OutBuf{
buf: make([]byte, test.bufLen),
off: test.off,
heap: make([]byte, test.heapLen),
}
pos, buf := ob.writeLoc(test.lenToWrite)
if pos != test.writePos {
t.Errorf("[%d] position = %d, expected %d", i, pos, test.writePos)
}
message := "mmapped area"
expected := ob.buf
if test.addressInHeap {
message = "heap"
expected = ob.heap
}
if &buf[0] != &expected[0] {
t.Errorf("[%d] expected position to be %q", i, message)
}
if len(ob.heap) != test.expectedHeapLen {
t.Errorf("[%d] expected len(ob.heap) == %d, got %d", i, test.expectedHeapLen, len(ob.heap))
}
}
}
func TestIsMmapped(t *testing.T) {
tests := []struct {
length int
expected bool
}{
{0, false},
{1, true},
}
for i, test := range tests {
ob := &OutBuf{buf: make([]byte, test.length)}
if v := ob.isMmapped(); v != test.expected {
t.Errorf("[%d] isMmapped == %t, expected %t", i, v, test.expected)
}
}
}