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// Copyright 2021 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 test
import (
"internal/testenv"
"os"
"path/filepath"
"regexp"
"testing"
)
// TestInst tests that only one instantiation of Sort is created, even though generic
// Sort is used for multiple pointer types across two packages.
func TestInst(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustHaveGoRun(t)
// Build ptrsort.go, which uses package mysort.
var output []byte
var err error
filename := "ptrsort.go"
exename := "ptrsort"
outname := "ptrsort.out"
gotool := testenv.GoToolPath(t)
dest := filepath.Join(t.TempDir(), exename)
cmd := testenv.Command(t, gotool, "build", "-o", dest, filepath.Join("testdata", filename))
if output, err = cmd.CombinedOutput(); err != nil {
t.Fatalf("Failed: %v:\nOutput: %s\n", err, output)
}
// Test that there is exactly one shape-based instantiation of Sort in
// the executable.
cmd = testenv.Command(t, gotool, "tool", "nm", dest)
if output, err = cmd.CombinedOutput(); err != nil {
t.Fatalf("Failed: %v:\nOut: %s\n", err, output)
}
// Look for shape-based instantiation of Sort, but ignore any extra wrapper
// ending in "-tramp" (which are created on riscv).
re := regexp.MustCompile(`\bSort\[.*shape.*\][^-]`)
r := re.FindAllIndex(output, -1)
if len(r) != 1 {
t.Fatalf("Wanted 1 instantiations of Sort function, got %d\n", len(r))
}
// Actually run the test and make sure output is correct.
cmd = testenv.Command(t, gotool, "run", filepath.Join("testdata", filename))
if output, err = cmd.CombinedOutput(); err != nil {
t.Fatalf("Failed: %v:\nOut: %s\n", err, output)
}
out, err := os.ReadFile(filepath.Join("testdata", outname))
if err != nil {
t.Fatalf("Could not find %s\n", outname)
}
if string(out) != string(output) {
t.Fatalf("Wanted output %v, got %v\n", string(out), string(output))
}
}