export_noswiss_test.go

     1  // Copyright 2024 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  //go:build !goexperiment.swissmap
     6  
     7  // This file allows non-GOEXPERIMENT=swissmap builds (i.e., old map builds) to
     8  // construct a swissmap table for running the tests in this package.
     9  
    10  package maps
    11  
    12  import (
    13  	"internal/abi"
    14  	"unsafe"
    15  )
    16  
    17  type instantiatedGroup[K comparable, V any] struct {
    18  	ctrls ctrlGroup
    19  	slots [abi.SwissMapGroupSlots]instantiatedSlot[K, V]
    20  }
    21  
    22  type instantiatedSlot[K comparable, V any] struct {
    23  	key  K
    24  	elem V
    25  }
    26  
    27  func newTestMapType[K comparable, V any]() *abi.SwissMapType {
    28  	var m map[K]V
    29  	mTyp := abi.TypeOf(m)
    30  	omt := (*abi.OldMapType)(unsafe.Pointer(mTyp))
    31  
    32  	var grp instantiatedGroup[K, V]
    33  	var slot instantiatedSlot[K, V]
    34  
    35  	mt := &abi.SwissMapType{
    36  		Key:      omt.Key,
    37  		Elem:     omt.Elem,
    38  		Group:    abi.TypeOf(grp),
    39  		Hasher:   omt.Hasher,
    40  		SlotSize: unsafe.Sizeof(slot),
    41  		ElemOff:  unsafe.Offsetof(slot.elem),
    42  	}
    43  	if omt.NeedKeyUpdate() {
    44  		mt.Flags |= abi.SwissMapNeedKeyUpdate
    45  	}
    46  	if omt.HashMightPanic() {
    47  		mt.Flags |= abi.SwissMapHashMightPanic
    48  	}
    49  	return mt
    50  }
    51
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