75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
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// Copyright 2020 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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//+build aix,gccgo
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// AIX linker isn't able to merge identical type descriptors coming from
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// different objects. Thus, two rtypes might have two different pointers
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// even if they are the same. Thus, instead of pointer equality, string
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// field is checked.
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package reflect
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import (
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"sync"
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)
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// rtypeEqual returns true if both rtypes are identical.
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func rtypeEqual(t1, t2 *rtype) bool {
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switch {
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case t1 == t2:
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return true
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case t1 == nil || t2 == nil:
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return false
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case t1.kind != t2.kind || t1.hash != t2.hash:
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return false
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default:
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return t1.String() == t2.String()
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}
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}
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// typeEqual returns true if both Types are identical.
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func typeEqual(t1, t2 Type) bool {
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return rtypeEqual(t1.common(), t2.common())
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}
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// toType converts from a *rtype to a Type that can be returned
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// to the client of package reflect. The only concern is that
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// a nil *rtype must be replaced by a nil Type.
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// On AIX, as type duplications can occur, it also ensure that
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// multiple *rtype for the same type are coalesced into a single
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// Type.
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var canonicalType = make(map[string]Type)
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var canonicalTypeLock sync.RWMutex
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func canonicalize(t Type) Type {
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if t == nil {
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return nil
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}
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s := t.rawString()
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canonicalTypeLock.RLock()
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if r, ok := canonicalType[s]; ok {
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canonicalTypeLock.RUnlock()
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return r
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}
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canonicalTypeLock.RUnlock()
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canonicalTypeLock.Lock()
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if r, ok := canonicalType[s]; ok {
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canonicalTypeLock.Unlock()
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return r
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}
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canonicalType[s] = t
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canonicalTypeLock.Unlock()
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return t
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}
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func toType(p *rtype) Type {
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if p == nil {
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return nil
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}
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return canonicalize(p)
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}
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