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cmd/addr2line: use the test binary as 'addr2line' instead of rebuilding it twice

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This not only reduces the latency of the test, but also respects
build flags like '-race' and '-cover' passed to the 'go test' command.

Change-Id: Ie9a3c03d32d7eea268ba6f8f8ac4000539434052
Reviewed-on: https://go-review.googlesource.com/c/go/+/450713
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Bryan C. Mills 2022-11-15 11:06:03 -05:00 committed by Gopher Robot
parent b95e9bc41e
commit 318ceda632
1 changed files with 44 additions and 18 deletions
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62
src/cmd/addr2line/addr2line_test.go
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@ -12,14 +12,47 @@ import (
"path/filepath"
"runtime"
"strings"
"sync"
"testing"
)
func loadSyms(t *testing.T) map[string]string {
cmd := testenv.Command(t, testenv.GoToolPath(t), "tool", "nm", os.Args[0])
// TestMain executes the test binary as the addr2line command if
// GO_ADDR2LINETEST_IS_ADDR2LINE is set, and runs the tests otherwise.
func TestMain(m *testing.M) {
if os.Getenv("GO_ADDR2LINETEST_IS_ADDR2LINE") != "" {
main()
os.Exit(0)
}
os.Setenv("GO_ADDR2LINETEST_IS_ADDR2LINE", "1") // Set for subprocesses to inherit.
os.Exit(m.Run())
}
// addr2linePath returns the path to the "addr2line" binary to run.
func addr2linePath(t testing.TB) string {
t.Helper()
testenv.MustHaveExec(t)
addr2linePathOnce.Do(func() {
addr2lineExePath, addr2linePathErr = os.Executable()
})
if addr2linePathErr != nil {
t.Fatal(addr2linePathErr)
}
return addr2lineExePath
}
var (
addr2linePathOnce sync.Once
addr2lineExePath string
addr2linePathErr error
)
func loadSyms(t *testing.T, dbgExePath string) map[string]string {
cmd := testenv.Command(t, testenv.GoToolPath(t), "tool", "nm", dbgExePath)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("go tool nm %v: %v\n%s", os.Args[0], err, string(out))
t.Fatalf("%v: %v\n%s", cmd, err, string(out))
}
syms := make(map[string]string)
scanner := bufio.NewScanner(bytes.NewReader(out))
@ -36,8 +69,8 @@ func loadSyms(t *testing.T) map[string]string {
return syms
}
func runAddr2Line(t *testing.T, exepath, addr string) (funcname, path, lineno string) {
cmd := testenv.Command(t, exepath, os.Args[0])
func runAddr2Line(t *testing.T, dbgExePath, addr string) (funcname, path, lineno string) {
cmd := testenv.Command(t, addr2linePath(t), dbgExePath)
cmd.Stdin = strings.NewReader(addr)
out, err := cmd.CombinedOutput()
if err != nil {
@ -62,8 +95,8 @@ func runAddr2Line(t *testing.T, exepath, addr string) (funcname, path, lineno st
const symName = "cmd/addr2line.TestAddr2Line"
func testAddr2Line(t *testing.T, exepath, addr string) {
funcName, srcPath, srcLineNo := runAddr2Line(t, exepath, addr)
func testAddr2Line(t *testing.T, dbgExePath, addr string) {
funcName, srcPath, srcLineNo := runAddr2Line(t, dbgExePath, addr)
if symName != funcName {
t.Fatalf("expected function name %v; got %v", symName, funcName)
}
@ -96,12 +129,12 @@ func testAddr2Line(t *testing.T, exepath, addr string) {
if !os.SameFile(fi1, fi2) {
t.Fatalf("addr2line_test.go and %s are not same file", srcPath)
}
if srcLineNo != "105" {
t.Fatalf("line number = %v; want 105", srcLineNo)
if srcLineNo != "138" {
t.Fatalf("line number = %v; want 138", srcLineNo)
}
}
// This is line 104. The test depends on that.
// This is line 137. The test depends on that.
func TestAddr2Line(t *testing.T) {
testenv.MustHaveGoBuild(t)
@ -118,15 +151,8 @@ func TestAddr2Line(t *testing.T) {
if err != nil {
t.Fatalf("go test -c -o %v cmd/addr2line: %v\n%s", exepath, err, string(out))
}
os.Args[0] = exepath
syms := loadSyms(t)
exepath = filepath.Join(tmpDir, "testaddr2line.exe")
out, err = testenv.Command(t, testenv.GoToolPath(t), "build", "-o", exepath, "cmd/addr2line").CombinedOutput()
if err != nil {
t.Fatalf("go build -o %v cmd/addr2line: %v\n%s", exepath, err, string(out))
}
syms := loadSyms(t, exepath)
testAddr2Line(t, exepath, syms[symName])
testAddr2Line(t, exepath, "0x"+syms[symName])