vitess.io/vitess@v0.16.2/go/tools/sizegen/integration/integration_test.go (about)

     1  /*
     2  Copyright 2021 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package integration
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  
    23  	"vitess.io/vitess/go/hack"
    24  )
    25  
    26  func TestTypeSizes(t *testing.T) {
    27  	var PtrSize = hack.RuntimeAllocSize(8)
    28  	var SliceHeaderSize = hack.RuntimeAllocSize(3 * PtrSize)
    29  	var FatPointerSize = hack.RuntimeAllocSize(2 * PtrSize)
    30  	var BucketHeaderSize = hack.RuntimeAllocSize(8)
    31  	var BucketSize = hack.RuntimeAllocSize(8)
    32  	var HashMapHeaderSize = hack.RuntimeAllocSize(48)
    33  
    34  	cases := []struct {
    35  		obj  cachedObject
    36  		size int64
    37  	}{
    38  		{&A{}, 16},
    39  		{&C{}, 16},
    40  		{&C{field1: &Bimpl{}}, 24},
    41  		{&D{}, 8},
    42  		{&D{field1: &Bimpl{}}, 16},
    43  		{&Padded{}, 24},
    44  
    45  		{&Slice1{}, 24},
    46  		{&Slice1{field1: []A{}}, SliceHeaderSize},
    47  		{&Slice1{field1: []A{{}}}, SliceHeaderSize + 16},
    48  		{&Slice1{field1: []A{{}, {}, {}, {}}}, SliceHeaderSize + 16*4},
    49  
    50  		{&Slice2{}, SliceHeaderSize},
    51  		{&Slice2{field1: []B{}}, SliceHeaderSize},
    52  		{&Slice2{field1: []B{&Bimpl{}}}, SliceHeaderSize + FatPointerSize*1 + 8*1},
    53  		{&Slice2{field1: []B{&Bimpl{}, &Bimpl{}, &Bimpl{}, &Bimpl{}}}, SliceHeaderSize + FatPointerSize*4 + 8*4},
    54  
    55  		{&Slice3{}, SliceHeaderSize},
    56  		{&Slice3{field1: []*Bimpl{}}, SliceHeaderSize},
    57  		{&Slice3{field1: []*Bimpl{nil}}, SliceHeaderSize + PtrSize*1 + 0},
    58  		{&Slice3{field1: []*Bimpl{nil, nil, nil, nil}}, SliceHeaderSize + PtrSize*4 + 0},
    59  		{&Slice3{field1: []*Bimpl{{}}}, SliceHeaderSize + PtrSize*1 + 8*1},
    60  		{&Slice3{field1: []*Bimpl{{}, {}, {}, {}}}, SliceHeaderSize + PtrSize*4 + 8*4},
    61  
    62  		{&Map1{field1: nil}, PtrSize},
    63  		{&Map1{field1: map[uint8]uint8{}}, PtrSize + HashMapHeaderSize},
    64  		{&Map1{field1: map[uint8]uint8{0: 0}}, PtrSize + HashMapHeaderSize + BucketHeaderSize + 1*BucketSize + 1*BucketSize + PtrSize},
    65  
    66  		{&Map2{field1: nil}, PtrSize},
    67  		{&Map2{field1: map[uint64]A{}}, PtrSize + HashMapHeaderSize},
    68  		{&Map2{field1: map[uint64]A{0: {}}}, PtrSize + HashMapHeaderSize + BucketHeaderSize + 8*BucketSize + 16*BucketSize + PtrSize},
    69  
    70  		{&Map3{field1: nil}, PtrSize},
    71  		{&Map3{field1: map[uint64]B{}}, PtrSize + HashMapHeaderSize},
    72  		{&Map3{field1: map[uint64]B{0: &Bimpl{}}}, PtrSize + HashMapHeaderSize + BucketHeaderSize + 8*BucketSize + FatPointerSize*BucketSize + PtrSize + 8},
    73  		{&Map3{field1: map[uint64]B{0: nil}}, PtrSize + HashMapHeaderSize + BucketHeaderSize + 8*BucketSize + FatPointerSize*BucketSize + PtrSize},
    74  
    75  		{&String1{}, hack.RuntimeAllocSize(PtrSize*2 + 8)},
    76  		{&String1{field1: "1234"}, hack.RuntimeAllocSize(PtrSize*2+8) + hack.RuntimeAllocSize(4)},
    77  	}
    78  
    79  	for _, tt := range cases {
    80  		t.Run(fmt.Sprintf("sizeof(%T)", tt.obj), func(t *testing.T) {
    81  			size := tt.obj.CachedSize(true)
    82  			if size != tt.size {
    83  				t.Errorf("expected %T to be %d bytes, got %d", tt.obj, tt.size, size)
    84  			}
    85  		})
    86  	}
    87  }