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cmd/compile/internal/types2: move typeHash to environment.go

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This is a clean port of CL 347560.

Change-Id: I0d56f5a818df1a66e603415d5198d909b0aef228
Reviewed-on: https://go-review.googlesource.com/c/go/+/348573
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer 2021-09-08 13:37:34 -07:00
parent 30e9bfbcef
commit ccc927b8f6
2 changed files with 36 additions and 37 deletions
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37
src/cmd/compile/internal/types2/environment.go
View File

@ -3,7 +3,10 @@
// license that can be found in the LICENSE file.
package types2
import "sync"
import (
"bytes"
"sync"
)
// An Environment is an opaque type checking environment. It may be used to
// share identical type instances across type-checked packages or calls to
@ -25,7 +28,37 @@ func NewEnvironment() *Environment {
}
}
// TODO(rfindley): move Environment.typeHash here.
// typeHash returns a string representation of typ, which can be used as an exact
// type hash: types that are identical produce identical string representations.
// If typ is a *Named type and targs is not empty, typ is printed as if it were
// instantiated with targs.
func (env *Environment) typeHash(typ Type, targs []Type) string {
assert(env != nil)
assert(typ != nil)
var buf bytes.Buffer
h := newTypeHasher(&buf, env)
if named, _ := typ.(*Named); named != nil && len(targs) > 0 {
// Don't use WriteType because we need to use the provided targs
// and not any targs that might already be with the *Named type.
h.typePrefix(named)
h.typeName(named.obj)
h.typeList(targs)
} else {
assert(targs == nil)
h.typ(typ)
}
if debug {
// there should be no instance markers in type hashes
for _, b := range buf.Bytes() {
assert(b != instanceMarker)
}
}
return buf.String()
}
// typeForHash returns the recorded type for the type hash h, if it exists.
// If no type exists for h and n is non-nil, n is recorded for h.
func (env *Environment) typeForHash(h string, n *Named) *Named {

36
src/cmd/compile/internal/types2/subst.go
View File

@ -6,10 +6,7 @@
package types2
import (
"bytes"
"cmd/compile/internal/syntax"
)
import "cmd/compile/internal/syntax"
type substMap map[*TypeParam]Type
@ -253,37 +250,6 @@ func (subst *subster) typ(typ Type) Type {
return typ
}
// typeHash returns a string representation of typ, which can be used as an exact
// type hash: types that are identical produce identical string representations.
// If typ is a *Named type and targs is not empty, typ is printed as if it were
// instantiated with targs.
func (env *Environment) typeHash(typ Type, targs []Type) string {
assert(env != nil)
assert(typ != nil)
var buf bytes.Buffer
h := newTypeHasher(&buf, env)
if named, _ := typ.(*Named); named != nil && len(targs) > 0 {
// Don't use WriteType because we need to use the provided targs
// and not any targs that might already be with the *Named type.
h.typePrefix(named)
h.typeName(named.obj)
h.typeList(targs)
} else {
assert(targs == nil)
h.typ(typ)
}
if debug {
// there should be no instance markers in type hashes
for _, b := range buf.Bytes() {
assert(b != instanceMarker)
}
}
return buf.String()
}
// typOrNil is like typ but if the argument is nil it is replaced with Typ[Invalid].
// A nil type may appear in pathological cases such as type T[P any] []func(_ T([]_))
// where an array/slice element is accessed before it is set up.