checkptr_test.go

Documentation: runtime

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime_test
     6  
     7  import (
     8  	"internal/testenv"
     9  	"os/exec"
    10  	"strings"
    11  	"testing"
    12  )
    13  
    14  func TestCheckPtr(t *testing.T) {
    15  	t.Parallel()
    16  	testenv.MustHaveGoRun(t)
    17  
    18  	exe, err := buildTestProg(t, "testprog", "-gcflags=all=-d=checkptr=1")
    19  	if err != nil {
    20  		t.Fatal(err)
    21  	}
    22  
    23  	testCases := []struct {
    24  		cmd  string
    25  		want string
    26  	}{
    27  		{"CheckPtrAlignmentPtr", "fatal error: checkptr: misaligned pointer conversion\n"},
    28  		{"CheckPtrAlignmentNoPtr", ""},
    29  		{"CheckPtrAlignmentNilPtr", ""},
    30  		{"CheckPtrArithmetic", "fatal error: checkptr: pointer arithmetic result points to invalid allocation\n"},
    31  		{"CheckPtrArithmetic2", "fatal error: checkptr: pointer arithmetic result points to invalid allocation\n"},
    32  		{"CheckPtrSize", "fatal error: checkptr: converted pointer straddles multiple allocations\n"},
    33  		{"CheckPtrSmall", "fatal error: checkptr: pointer arithmetic computed bad pointer value\n"},
    34  		{"CheckPtrSliceOK", ""},
    35  		{"CheckPtrSliceFail", "fatal error: checkptr: unsafe.Slice result straddles multiple allocations\n"},
    36  	}
    37  
    38  	for _, tc := range testCases {
    39  		tc := tc
    40  		t.Run(tc.cmd, func(t *testing.T) {
    41  			t.Parallel()
    42  			got, err := testenv.CleanCmdEnv(exec.Command(exe, tc.cmd)).CombinedOutput()
    43  			if err != nil {
    44  				t.Log(err)
    45  			}
    46  			if tc.want == "" {
    47  				if len(got) > 0 {
    48  					t.Errorf("output:\n%s\nwant no output", got)
    49  				}
    50  				return
    51  			}
    52  			if !strings.HasPrefix(string(got), tc.want) {
    53  				t.Errorf("output:\n%s\n\nwant output starting with: %s", got, tc.want)
    54  			}
    55  		})
    56  	}
    57  }
    58
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