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📁 ..
📄 ar.go(5.38 KB)
📄 asmb.go(5.21 KB)
📄 config.go(7.54 KB)
📄 data.go(89.78 KB)
📄 data_test.go(2.32 KB)
📄 deadcode.go(15.66 KB)
📄 deadcode_test.go(1.34 KB)
📄 decodesym.go(9.98 KB)
📄 dwarf.go(72.83 KB)
📄 dwarf_test.go(46.02 KB)
📄 elf.go(59.18 KB)
📄 elf_test.go(2.75 KB)
📄 errors.go(1.91 KB)
📄 execarchive.go(901 B)
📄 execarchive_noexec.go(343 B)
📄 fallocate_test.go(1.64 KB)
📄 go.go(11.84 KB)
📄 go_test.go(2.68 KB)
📄 heap.go(960 B)
📄 heap_test.go(1.87 KB)
📄 issue33808_test.go(792 B)
📄 ld.go(8.08 KB)
📄 ld_test.go(8.16 KB)
📄 lib.go(76.84 KB)
📄 link.go(5.13 KB)
📄 macho.go(43.02 KB)
📄 macho_combine_dwarf.go(13.11 KB)
📄 main.go(14.01 KB)
📄 nooptcgolink_test.go(738 B)
📄 outbuf.go(8.05 KB)
📄 outbuf_darwin.go(1.48 KB)
📄 outbuf_linux.go(304 B)
📄 outbuf_mmap.go(1.51 KB)
📄 outbuf_nofallocate.go(342 B)
📄 outbuf_nommap.go(805 B)
📄 outbuf_notdarwin.go(292 B)
📄 outbuf_test.go(2.21 KB)
📄 outbuf_windows.go(2.28 KB)
📄 pcln.go(28.96 KB)
📄 pe.go(45.98 KB)
📄 stackcheck.go(11.86 KB)
📄 stackcheck_test.go(2.26 KB)
📄 sym.go(3.89 KB)
📄 symtab.go(29.49 KB)
📄 target.go(3.77 KB)
📁 testdata
📄 typelink.go(1.87 KB)
📄 util.go(2.46 KB)
📄 xcoff.go(51.88 KB)

Editing: outbuf_test.go

// 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)
		}
	}
}

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Editing: outbuf_test.go

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