1 files changed, 157 insertions, 0 deletions
diff --git a/misc/cgo/errors/errors_test.go b/misc/cgo/errors/errors_test.go
new file mode 100644
index 0000000..e90ed1e
--- /dev/null
+++ b/misc/cgo/errors/errors_test.go
@@ -0,0 +1,157 @@
+// Copyright 2017 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 errorstest
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func path(file string) string {
+	return filepath.Join("testdata", file)
+}
+
+func check(t *testing.T, file string) {
+	t.Run(file, func(t *testing.T) {
+		t.Parallel()
+
+		contents, err := os.ReadFile(path(file))
+		if err != nil {
+			t.Fatal(err)
+		}
+		var errors []*regexp.Regexp
+		for i, line := range bytes.Split(contents, []byte("\n")) {
+			if bytes.HasSuffix(line, []byte("ERROR HERE")) {
+				re := regexp.MustCompile(regexp.QuoteMeta(fmt.Sprintf("%s:%d:", file, i+1)))
+				errors = append(errors, re)
+				continue
+			}
+
+			_, frag, ok := bytes.Cut(line, []byte("ERROR HERE: "))
+			if !ok {
+				continue
+			}
+			re, err := regexp.Compile(fmt.Sprintf(":%d:.*%s", i+1, frag))
+			if err != nil {
+				t.Errorf("Invalid regexp after `ERROR HERE: `: %#q", frag)
+				continue
+			}
+			errors = append(errors, re)
+		}
+		if len(errors) == 0 {
+			t.Fatalf("cannot find ERROR HERE")
+		}
+		expect(t, file, errors)
+	})
+}
+
+func expect(t *testing.T, file string, errors []*regexp.Regexp) {
+	dir, err := os.MkdirTemp("", filepath.Base(t.Name()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	dst := filepath.Join(dir, strings.TrimSuffix(file, ".go"))
+	cmd := exec.Command("go", "build", "-gcflags=-L -e", "-o="+dst, path(file)) // TODO(gri) no need for -gcflags=-L if go tool is adjusted
+	out, err := cmd.CombinedOutput()
+	if err == nil {
+		t.Errorf("expected cgo to fail but it succeeded")
+	}
+
+	lines := bytes.Split(out, []byte("\n"))
+	for _, re := range errors {
+		found := false
+		for _, line := range lines {
+			if re.Match(line) {
+				t.Logf("found match for %#q: %q", re, line)
+				found = true
+				break
+			}
+		}
+		if !found {
+			t.Errorf("expected error output to contain %#q", re)
+		}
+	}
+
+	if t.Failed() {
+		t.Logf("actual output:\n%s", out)
+	}
+}
+
+func sizeofLongDouble(t *testing.T) int {
+	cmd := exec.Command("go", "run", path("long_double_size.go"))
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("%#q: %v:\n%s", strings.Join(cmd.Args, " "), err, out)
+	}
+
+	i, err := strconv.Atoi(strings.TrimSpace(string(out)))
+	if err != nil {
+		t.Fatalf("long_double_size.go printed invalid size: %s", out)
+	}
+	return i
+}
+
+func TestReportsTypeErrors(t *testing.T) {
+	for _, file := range []string{
+		"err1.go",
+		"err2.go",
+		"issue11097a.go",
+		"issue11097b.go",
+		"issue18452.go",
+		"issue18889.go",
+		"issue28721.go",
+		"issue33061.go",
+	} {
+		check(t, file)
+	}
+
+	if sizeofLongDouble(t) > 8 {
+		for _, file := range []string{
+			"err4.go",
+			"issue28069.go",
+		} {
+			check(t, file)
+		}
+	}
+}
+
+func TestToleratesOptimizationFlag(t *testing.T) {
+	for _, cflags := range []string{
+		"",
+		"-O",
+	} {
+		cflags := cflags
+		t.Run(cflags, func(t *testing.T) {
+			t.Parallel()
+
+			cmd := exec.Command("go", "build", path("issue14669.go"))
+			cmd.Env = append(os.Environ(), "CGO_CFLAGS="+cflags)
+			out, err := cmd.CombinedOutput()
+			if err != nil {
+				t.Errorf("%#q: %v:\n%s", strings.Join(cmd.Args, " "), err, out)
+			}
+		})
+	}
+}
+
+func TestMallocCrashesOnNil(t *testing.T) {
+	t.Parallel()
+
+	cmd := exec.Command("go", "run", path("malloc.go"))
+	out, err := cmd.CombinedOutput()
+	if err == nil {
+		t.Logf("%#q:\n%s", strings.Join(cmd.Args, " "), out)
+		t.Fatalf("succeeded unexpectedly")
+	}
+}