issue30606b.go

     1  // run
     2  
     3  // Copyright 2019 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import "reflect"
    10  
    11  func main() {}
    12  
    13  func typ(x interface{}) reflect.Type { return reflect.ValueOf(x).Type() }
    14  
    15  var byteType = typ((byte)(0))
    16  var ptrType = typ((*byte)(nil))
    17  
    18  // Arrays of pointers. There are two size thresholds.
    19  // Bit masks are chunked in groups of 120 pointers.
    20  // Array types with >16384 pointers have a GC program instead of a bitmask.
    21  var smallPtrType = reflect.ArrayOf(100, ptrType)
    22  var mediumPtrType = reflect.ArrayOf(1000, ptrType)
    23  var bigPtrType = reflect.ArrayOf(16385, ptrType)
    24  
    25  var x0 = reflect.New(reflect.StructOf([]reflect.StructField{
    26  	{Name: "F1", Type: byteType},
    27  	{Name: "F2", Type: bigPtrType},
    28  }))
    29  var x1 = reflect.New(reflect.StructOf([]reflect.StructField{
    30  	{Name: "F1", Type: smallPtrType},
    31  	{Name: "F2", Type: bigPtrType},
    32  }))
    33  var x2 = reflect.New(reflect.StructOf([]reflect.StructField{
    34  	{Name: "F1", Type: mediumPtrType},
    35  	{Name: "F2", Type: bigPtrType},
    36  }))
    37  var x3 = reflect.New(reflect.StructOf([]reflect.StructField{
    38  	{Name: "F1", Type: ptrType},
    39  	{Name: "F2", Type: byteType},
    40  	{Name: "F3", Type: bigPtrType},
    41  }))
    42  var x4 = reflect.New(reflect.StructOf([]reflect.StructField{
    43  	{Name: "F1", Type: ptrType},
    44  	{Name: "F2", Type: smallPtrType},
    45  	{Name: "F3", Type: bigPtrType},
    46  }))
    47  var x5 = reflect.New(reflect.StructOf([]reflect.StructField{
    48  	{Name: "F1", Type: ptrType},
    49  	{Name: "F2", Type: mediumPtrType},
    50  	{Name: "F3", Type: bigPtrType},
    51  }))
    52
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