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opt / golang / 1.19.4 / src / cmd / link / internal / ld /

📁 ..
📄 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: fallocate_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.

//go:build darwin || linux
// +build darwin linux

package ld

import (
	"os"
	"path/filepath"
	"syscall"
	"testing"
)

func TestFallocate(t *testing.T) {
	dir := t.TempDir()
	filename := filepath.Join(dir, "a.out")
	out := NewOutBuf(nil)
	err := out.Open(filename)
	if err != nil {
		t.Fatalf("Open file failed: %v", err)
	}
	defer out.Close()

// Try fallocate first.
	for {
		err = out.fallocate(1 << 10)
		if err == syscall.EOPNOTSUPP { // The underlying file system may not support fallocate
			t.Skip("fallocate is not supported")
		}
		if err == syscall.EINTR {
			continue // try again
		}
		if err != nil {
			t.Fatalf("fallocate failed: %v", err)
		}
		break
	}

// Mmap 1 MiB initially, and grow to 2 and 3 MiB.
	// Check if the file size and disk usage is expected.
	for _, sz := range []int64{1 << 20, 2 << 20, 3 << 20} {
		err = out.Mmap(uint64(sz))
		if err != nil {
			t.Fatalf("Mmap failed: %v", err)
		}
		stat, err := os.Stat(filename)
		if err != nil {
			t.Fatalf("Stat failed: %v", err)
		}
		if got := stat.Size(); got != sz {
			t.Errorf("unexpected file size: got %d, want %d", got, sz)
		}
		// The number of blocks must be enough for the requested size.
		// We used to require an exact match, but it appears that
		// some file systems allocate a few extra blocks in some cases.
		// See issue #41127.
		if got, want := stat.Sys().(*syscall.Stat_t).Blocks, (sz+511)/512; got < want {
			t.Errorf("unexpected disk usage: got %d blocks, want at least %d", got, want)
		}
		out.munmap()
	}
}

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Editing: fallocate_test.go

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