llgo/ssa: AfterInit/SliceLit/InterfaceData, unsafe.Slice; ssa/abi: Basic/Struct

ssa/abi/abi.go

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package abi
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"go/types"
+	"hash"
+)
+
+// Builder is a helper for constructing ABI types.
+type Builder struct {
+	h   hash.Hash
+	buf []byte
+	Pkg string
+}
+
+// New creates a new ABI type Builder.
+func New(pkg string) *Builder {
+	ret := new(Builder)
+	ret.Init(pkg)
+	return ret
+}
+
+func (b *Builder) Init(pkg string) {
+	b.Pkg = pkg
+	b.h = sha256.New()
+	b.buf = make([]byte, sha256.Size)
+}
+
+// TypeName returns the ABI type name for the specified type.
+func (b *Builder) TypeName(t types.Type) (ret string, private bool) {
+	switch t := t.(type) {
+	case *types.Basic:
+		return BasicName(t), false
+	case *types.Pointer:
+		ret, private = b.TypeName(t.Elem())
+		return "*" + ret, private
+	case *types.Struct:
+		return b.StructName(t)
+	}
+	panic("todo")
+}
+
+func BasicName(t *types.Basic) string {
+	return "_llgo_" + t.Name()
+}
+
+// StructName returns the ABI type name for the specified struct type.
+func (b *Builder) StructName(t *types.Struct) (ret string, private bool) {
+	hash, private := b.structHash(t)
+	hashStr := base64.RawURLEncoding.EncodeToString(hash)
+	if private {
+		return b.Pkg + ".struct$" + hashStr, true
+	}
+	return "_llgo_struct$" + hashStr, false
+}
+
+func (b *Builder) structHash(t *types.Struct) (ret []byte, private bool) {
+	h := b.h
+	h.Reset()
+	n := t.NumFields()
+	fmt.Fprintln(h, "struct", n)
+	for i := 0; i < n; i++ {
+		f := t.Field(i)
+		if !f.Exported() {
+			private = true
+		}
+		name := f.Name()
+		if f.Embedded() {
+			name = "-"
+		}
+		ft, fpriv := b.TypeName(f.Type())
+		if fpriv {
+			private = true
+		}
+		fmt.Fprintln(h, name, ft)
+	}
+	ret = h.Sum(b.buf[:0])
+	return
+}