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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: stackcheck_test.go

// Copyright 2022 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 (
	"fmt"
	"internal/testenv"
	"os"
	"os/exec"
	"regexp"
	"strconv"
	"testing"
)

// See also $GOROOT/test/nosplit.go for multi-platform edge case tests.

func TestStackCheckOutput(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	t.Parallel()

cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", os.DevNull, "./testdata/stackcheck")
	// The rules for computing frame sizes on all of the
	// architectures are complicated, so just do this on amd64.
	cmd.Env = append(os.Environ(), "GOARCH=amd64", "GOOS=linux")
	outB, err := cmd.CombinedOutput()

if err == nil {
		t.Fatalf("expected link to fail")
	}
	out := string(outB)

t.Logf("linker output:\n%s", out)

// Get expected limit.
	limitRe := regexp.MustCompile("nosplit stack over ([0-9]+) byte limit")
	m := limitRe.FindStringSubmatch(out)
	if m == nil {
		t.Fatalf("no overflow errors in output")
	}
	limit, _ := strconv.Atoi(m[1])

wantMap := map[string]string{
		"main.startSelf": fmt.Sprintf(
			`main.startSelf<0>
    grows 1008 bytes
    %d bytes over limit
`, 1008-limit),
		"main.startChain": fmt.Sprintf(
			`main.startChain<0>
    grows 32 bytes, calls main.chain0<0>
        grows 48 bytes, calls main.chainEnd<0>
            grows 1008 bytes
            %d bytes over limit
    grows 32 bytes, calls main.chain2<0>
        grows 80 bytes, calls main.chainEnd<0>
            grows 1008 bytes
            %d bytes over limit
`, 32+48+1008-limit, 32+80+1008-limit),
		"main.startRec": `main.startRec<0>
    grows 8 bytes, calls main.startRec0<0>
        grows 8 bytes, calls main.startRec<0>
        infinite cycle
`,
	}

// Parse stanzas
	stanza := regexp.MustCompile(`^(.*): nosplit stack over [0-9]+ byte limit\n(.*\n(?: .*\n)*)`)
	// Strip comments from cmd/go
	out = regexp.MustCompile(`(?m)^#.*\n`).ReplaceAllString(out, "")
	for len(out) > 0 {
		m := stanza.FindStringSubmatch(out)
		if m == nil {
			t.Fatalf("unexpected output:\n%s", out)
		}
		out = out[len(m[0]):]
		fn := m[1]
		got := m[2]

want, ok := wantMap[fn]
		if !ok {
			t.Errorf("unexpected function: %s", fn)
		} else if want != got {
			t.Errorf("want:\n%sgot:\n%s", want, got)
		}
	}
}

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Editing: stackcheck_test.go

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