CFuncPtr.Hash

internal/typeutil/map.go

@@ -4,7 +4,7 @@
 
 // Package typeutil defines various utilities for types, such as Map,
 // a mapping from types.Type to interface{} values.
-package typeutil // import "golang.org/x/tools/go/types/typeutil"
+package typeutil
 
 import (
 	"bytes"
@@ -253,39 +253,7 @@ func hashString(s string) uint32 {
 	return h
 }
 
-// hashFor computes the hash of t.
-func (h Hasher) hashFor(t types.Type) uint32 {
-	// See Identical for rationale.
-	switch t := t.(type) {
-	case *types.Basic:
-		return uint32(t.Kind())
-
-	case *aliases.Alias:
-		return h.Hash(t.Underlying())
-
-	case *types.Array:
-		return 9043 + 2*uint32(t.Len()) + 3*h.Hash(t.Elem())
-
-	case *types.Slice:
-		return 9049 + 2*h.Hash(t.Elem())
-
-	case *types.Struct:
-		var hash uint32 = 9059
-		for i, n := 0, t.NumFields(); i < n; i++ {
-			f := t.Field(i)
-			if f.Anonymous() {
-				hash += 8861
-			}
-			hash += hashString(t.Tag(i))
-			hash += hashString(f.Name()) // (ignore f.Pkg)
-			hash += h.Hash(f.Type())
-		}
-		return hash
-
-	case *types.Pointer:
-		return 9067 + 2*h.Hash(t.Elem())
-
-	case *types.Signature:
+func HashSig(h Hasher, t *types.Signature) uint32 {
 	var hash uint32 = 9091
 	if t.Variadic() {
 		hash *= 8863
@@ -321,6 +289,42 @@ func (h Hasher) hashFor(t types.Type) uint32 {
 	}
 
 	return hash + 3*h.hashTuple(t.Params()) + 5*h.hashTuple(t.Results())
+}
+
+// hashFor computes the hash of t.
+func (h Hasher) hashFor(t types.Type) uint32 {
+	// See Identical for rationale.
+	switch t := t.(type) {
+	case *types.Basic:
+		return uint32(t.Kind())
+
+	case *aliases.Alias:
+		return h.Hash(t.Underlying())
+
+	case *types.Array:
+		return 9043 + 2*uint32(t.Len()) + 3*h.Hash(t.Elem())
+
+	case *types.Slice:
+		return 9049 + 2*h.Hash(t.Elem())
+
+	case *types.Struct:
+		var hash uint32 = 9059
+		for i, n := 0, t.NumFields(); i < n; i++ {
+			f := t.Field(i)
+			if f.Anonymous() {
+				hash += 8861
+			}
+			hash += hashString(t.Tag(i))
+			hash += hashString(f.Name()) // (ignore f.Pkg)
+			hash += h.Hash(f.Type())
+		}
+		return hash
+
+	case *types.Pointer:
+		return 9067 + 2*h.Hash(t.Elem())
+
+	case *types.Signature:
+		return HashSig(h, t)
 
 	case *types.Union:
 		return h.hashUnion(t)
@@ -370,6 +374,9 @@ func (h Hasher) hashFor(t types.Type) uint32 {
 
 	case *types.Tuple:
 		return h.hashTuple(t)
+
+	case interface{ Hash(h Hasher) uint32 }:
+		return t.Hash(h)
 	}
 
 	panic(fmt.Sprintf("%T: %v", t, t))

ssa/type_c.go

@@ -18,6 +18,8 @@ package ssa
 
 import (
 	"go/types"
+
+	"github.com/goplus/llgo/internal/typeutil"
 )
 
 // -----------------------------------------------------------------------------
@@ -46,6 +48,10 @@ type CFuncPtr types.Signature
 func (t *CFuncPtr) String() string         { return (*types.Signature)(t).String() }
 func (t *CFuncPtr) Underlying() types.Type { return (*types.Signature)(t) }
 
+func (t *CFuncPtr) Hash(h typeutil.Hasher) uint32 {
+	return typeutil.HashSig(h, (*types.Signature)(t))*13 + 97
+}
+
 // -----------------------------------------------------------------------------
 
 // CType convert a C type into Go.