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![Keith Randall](/assets/img/avatar_default.png)
First the insidious bug: var n uintptr for n := elemPtrs; n > 120; n -= 120 { prog = append(prog, 120) prog = append(prog, mask[:15]...) mask = mask[15:] } prog = append(prog, byte(n)) prog = append(prog, mask[:(n+7)/8]...) The := breaks this code, because the n after the loop is always 0! We also do need to handle field padding correctly. In particular the old padding code doesn't correctly handle fields that are not a multiple of a pointer in size. Fixes #30606. Change-Id: Ifcab9494dc25c20116753c5d7e0145d6c2053ed8 Reviewed-on: https://go-review.googlesource.com/c/go/+/165860 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
// run
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "reflect"
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func main() {}
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func typ(x interface{}) reflect.Type { return reflect.ValueOf(x).Type() }
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var byteType = typ((byte)(0))
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var ptrType = typ((*byte)(nil))
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// Arrays of pointers. There are two size thresholds.
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// Bit masks are chunked in groups of 120 pointers.
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// Array types with >16384 pointers have a GC program instead of a bitmask.
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var smallPtrType = reflect.ArrayOf(100, ptrType)
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var mediumPtrType = reflect.ArrayOf(1000, ptrType)
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var bigPtrType = reflect.ArrayOf(16385, ptrType)
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var x0 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: byteType},
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{Name: "F2", Type: bigPtrType},
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}))
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var x1 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: smallPtrType},
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{Name: "F2", Type: bigPtrType},
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}))
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var x2 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: mediumPtrType},
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{Name: "F2", Type: bigPtrType},
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}))
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var x3 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: ptrType},
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{Name: "F2", Type: byteType},
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{Name: "F3", Type: bigPtrType},
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}))
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var x4 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: ptrType},
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{Name: "F2", Type: smallPtrType},
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{Name: "F3", Type: bigPtrType},
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}))
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var x5 = reflect.New(reflect.StructOf([]reflect.StructField{
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{Name: "F1", Type: ptrType},
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{Name: "F2", Type: mediumPtrType},
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{Name: "F3", Type: bigPtrType},
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}))
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