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Editing: checkptr_test.go

// Copyright 2020 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 runtime_test

import (
	"internal/testenv"
	"os/exec"
	"strings"
	"testing"
)

func TestCheckPtr(t *testing.T) {
	// This test requires rebuilding packages with -d=checkptr=1,
	// so it's somewhat slow.
	if testing.Short() {
		t.Skip("skipping test in -short mode")
	}

t.Parallel()
	testenv.MustHaveGoRun(t)

exe, err := buildTestProg(t, "testprog", "-gcflags=all=-d=checkptr=1")
	if err != nil {
		t.Fatal(err)
	}

testCases := []struct {
		cmd  string
		want string
	}{
		{"CheckPtrAlignmentPtr", "fatal error: checkptr: misaligned pointer conversion\n"},
		{"CheckPtrAlignmentNoPtr", ""},
		{"CheckPtrAlignmentNilPtr", ""},
		{"CheckPtrArithmetic", "fatal error: checkptr: pointer arithmetic result points to invalid allocation\n"},
		{"CheckPtrArithmetic2", "fatal error: checkptr: pointer arithmetic result points to invalid allocation\n"},
		{"CheckPtrSize", "fatal error: checkptr: converted pointer straddles multiple allocations\n"},
		{"CheckPtrSmall", "fatal error: checkptr: pointer arithmetic computed bad pointer value\n"},
		{"CheckPtrSliceOK", ""},
		{"CheckPtrSliceFail", "fatal error: checkptr: unsafe.Slice result straddles multiple allocations\n"},
		{"CheckPtrStringOK", ""},
		{"CheckPtrStringFail", "fatal error: checkptr: unsafe.String result straddles multiple allocations\n"},
	}

for _, tc := range testCases {
		tc := tc
		t.Run(tc.cmd, func(t *testing.T) {
			t.Parallel()
			got, err := testenv.CleanCmdEnv(exec.Command(exe, tc.cmd)).CombinedOutput()
			if err != nil {
				t.Log(err)
			}
			if tc.want == "" {
				if len(got) > 0 {
					t.Errorf("output:\n%s\nwant no output", got)
				}
				return
			}
			if !strings.HasPrefix(string(got), tc.want) {
				t.Errorf("output:\n%s\n\nwant output starting with: %s", got, tc.want)
			}
		})
	}
}

func TestCheckPtr2(t *testing.T) {
	// This test requires rebuilding packages with -d=checkptr=2,
	// so it's somewhat slow.
	if testing.Short() {
		t.Skip("skipping test in -short mode")
	}

t.Parallel()
	testenv.MustHaveGoRun(t)

exe, err := buildTestProg(t, "testprog", "-gcflags=all=-d=checkptr=2")
	if err != nil {
		t.Fatal(err)
	}

testCases := []struct {
		cmd  string
		want string
	}{
		{"CheckPtrAlignmentNested", "fatal error: checkptr: converted pointer straddles multiple allocations\n"},
	}

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