github.com/m3db/m3@v1.5.0/src/x/checked/debug_test.go (about)

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package checked
    22  
    23  import (
    24  	"errors"
    25  	"strings"
    26  	"testing"
    27  
    28  	"github.com/stretchr/testify/assert"
    29  	"github.com/stretchr/testify/require"
    30  )
    31  
    32  func TestSetPanicFn(t *testing.T) {
    33  	var err error
    34  	SetPanicFn(func(e error) {
    35  		err = e
    36  	})
    37  	defer ResetPanicFn()
    38  
    39  	expected := errors.New("an error")
    40  	Panic(expected)
    41  
    42  	assert.Equal(t, expected, err)
    43  }
    44  
    45  func TestTracebackReadAfterFree(t *testing.T) {
    46  	EnableTracebacks()
    47  	defer DisableTracebacks()
    48  	SetTracebackCycles(2)
    49  	defer SetTracebackCycles(defaultTracebackCycles)
    50  
    51  	for i := 0; i < 1000; i++ {
    52  		elem := &struct {
    53  			RefCount
    54  			x int
    55  		}{
    56  			x: 42,
    57  		}
    58  
    59  		finalized := 0
    60  		elem.SetOnFinalize(OnFinalizeFn(func() {
    61  			finalized++
    62  		}))
    63  
    64  		elem.IncRef()
    65  		assert.Equal(t, 1, elem.NumRef())
    66  		assert.Equal(t, 0, finalized)
    67  
    68  		elem.IncReads()
    69  		assert.Equal(t, 1, elem.NumReaders())
    70  
    71  		elem.DecReads()
    72  		assert.Equal(t, 0, elem.NumReaders())
    73  
    74  		elem.DecRef()
    75  		assert.Equal(t, 0, finalized)
    76  
    77  		elem.Finalize()
    78  		assert.Equal(t, 1, finalized)
    79  
    80  		var err error
    81  		SetPanicFn(func(e error) {
    82  			err = e
    83  		})
    84  
    85  		elem.IncReads()
    86  
    87  		require.Error(t, err)
    88  
    89  		ResetPanicFn()
    90  
    91  		str := err.Error()
    92  		assert.True(t, strings.Contains(str, "read after free: reads=1, ref=0"))
    93  		assert.True(t, strings.Contains(str, "IncReads, ref=0, unixnanos="))
    94  		assert.True(t, strings.Contains(str, "checked.(*RefCount).IncReads"))
    95  		assert.True(t, strings.Contains(str, "DecRef, ref=0, unixnanos="))
    96  		assert.True(t, strings.Contains(str, "checked.(*RefCount).DecRef"))
    97  		assert.True(t, strings.Contains(str, "IncRef, ref=1, unixnanos="))
    98  		assert.True(t, strings.Contains(str, "checked.(*RefCount).IncRef"))
    99  	}
   100  }
   101  
   102  func TestTracebackDoubleWrite(t *testing.T) {
   103  	EnableTracebacks()
   104  	defer DisableTracebacks()
   105  	SetTracebackCycles(2)
   106  	defer SetTracebackCycles(defaultTracebackCycles)
   107  
   108  	for i := 0; i < 1000; i++ {
   109  		elem := &struct {
   110  			RefCount
   111  			x int
   112  		}{
   113  			x: 42,
   114  		}
   115  
   116  		finalized := 0
   117  		elem.SetOnFinalize(OnFinalizeFn(func() {
   118  			finalized++
   119  		}))
   120  
   121  		elem.IncRef()
   122  		elem.DecRef()
   123  		assert.Equal(t, 0, elem.NumRef())
   124  
   125  		elem.IncRef()
   126  		assert.Equal(t, 1, elem.NumRef())
   127  		assert.Equal(t, 0, finalized)
   128  
   129  		elem.IncWrites()
   130  		elem.DecWrites()
   131  		assert.Equal(t, 0, elem.NumWriters())
   132  
   133  		elem.DecRef()
   134  
   135  		elem.IncRef()
   136  		elem.MoveRef()
   137  		assert.Equal(t, 1, elem.NumRef())
   138  
   139  		var err error
   140  		SetPanicFn(func(e error) {
   141  			err = e
   142  		})
   143  
   144  		elem.IncWrites()
   145  		assert.Equal(t, 1, elem.NumWriters())
   146  
   147  		elem.IncWrites()
   148  
   149  		require.Error(t, err)
   150  
   151  		ResetPanicFn()
   152  
   153  		str := err.Error()
   154  		assert.True(t, strings.Contains(str, "double write: writes=2, ref=1"))
   155  		assert.True(t, strings.Contains(str, "IncWrites, ref=1, unixnanos="))
   156  		assert.True(t, strings.Contains(str, "checked.(*RefCount).IncWrites"))
   157  		assert.True(t, strings.Contains(str, "IncWrites, ref=1, unixnanos="))
   158  		assert.True(t, strings.Contains(str, "checked.(*RefCount).IncWrites"))
   159  		assert.True(t, strings.Contains(str, "IncRef, ref=1, unixnanos="))
   160  		assert.True(t, strings.Contains(str, "checked.(*RefCount).IncRef"))
   161  	}
   162  }