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52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gc
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import (
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"bytes"
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"internal/testenv"
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"os/exec"
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"testing"
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)
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// TestIntendedInlining tests that specific runtime functions are inlined.
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// This allows refactoring for code clarity and re-use without fear that
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// changes to the compiler will cause silent performance regressions.
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func TestIntendedInlining(t *testing.T) {
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if testing.Short() && testenv.Builder() == "" {
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t.Skip("skipping in short mode")
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}
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testenv.MustHaveGoRun(t)
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t.Parallel()
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// want is the list of function names that should be inlined.
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want := []string{"tophash", "add", "(*bmap).keys", "bucketShift", "bucketMask"}
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m := make(map[string]bool, len(want))
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for _, s := range want {
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m[s] = true
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}
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cmd := testenv.CleanCmdEnv(exec.Command(testenv.GoToolPath(t), "build", "-a", "-gcflags=-m", "runtime"))
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Logf("%s", out)
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t.Fatal(err)
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}
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lines := bytes.Split(out, []byte{'\n'})
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for _, x := range lines {
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f := bytes.Split(x, []byte(": can inline "))
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if len(f) < 2 {
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continue
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}
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fn := bytes.TrimSpace(f[1])
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delete(m, string(fn))
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}
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for s := range m {
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t.Errorf("function %s not inlined", s)
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}
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}
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