This is a 1:1 port of CL 309830 to go/types.
Change-Id: Ibf709f8194dd5e93a87145e5f9db674ce93af529
Reviewed-on: https://go-review.googlesource.com/c/go/+/314594
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
}
for _, test := range tests {
+ ResetId() // avoid renumbering of type parameter ids when adding tests
if strings.HasPrefix(test.src, genericPkg) && !typeparams.Enabled {
continue
}
pkg *Package
*Info
version version // accepted language version
- nextId uint64 // unique Id for type parameters (first valid Id is 1)
objMap map[Object]*declInfo // maps package-level objects and (non-interface) methods to declaration info
impMap map[importKey]*Package // maps (import path, source directory) to (complete or fake) package
posMap map[*Interface][]token.Pos // maps interface types to lists of embedded interface positions
pkg: pkg,
Info: info,
version: version,
- nextId: 1,
objMap: make(map[Object]*declInfo),
impMap: make(map[importKey]*Package),
posMap: make(map[*Interface][]token.Pos),
import (
"fmt"
"go/token"
+ "sync/atomic"
)
// A Type represents a type of Go.
}
}
+// Note: This is a uint32 rather than a uint64 because the
+// respective 64 bit atomic instructions are not available
+// on all platforms.
+var lastId uint32
+
+// nextId returns a value increasing monotonically by 1 with
+// each call, starting with 1. It may be called concurrently.
+func nextId() uint64 { return uint64(atomic.AddUint32(&lastId, 1)) }
+
// A _TypeParam represents a type parameter type.
type _TypeParam struct {
check *Checker // for lazy type bound completion
// newTypeParam returns a new TypeParam.
func (check *Checker) newTypeParam(obj *TypeName, index int, bound Type) *_TypeParam {
assert(bound != nil)
- typ := &_TypeParam{check: check, id: check.nextId, obj: obj, index: index, bound: bound}
- check.nextId++
+ typ := &_TypeParam{check: check, id: nextId(), obj: obj, index: index, bound: bound}
if obj.typ == nil {
obj.typ = typ
}
--- /dev/null
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package types
+
+import "sync/atomic"
+
+// Upon calling ResetId, nextId starts with 1 again.
+// It may be called concurrently. This is only needed
+// for tests where we may want to have a consistent
+// numbering for each individual test case.
+func ResetId() { atomic.StoreUint32(&lastId, 0) }