llgo/internal/llgen

internal/llgen/llgen.go

@@ -0,0 +1,71 @@
+/*
+ * 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 llgen
+
+import (
+	"go/ast"
+	"go/importer"
+	"go/parser"
+	"go/token"
+	"go/types"
+	"os"
+
+	"github.com/goplus/llgo/cl"
+	"golang.org/x/tools/go/ssa"
+	"golang.org/x/tools/go/ssa/ssautil"
+
+	llssa "github.com/goplus/llgo/ssa"
+)
+
+func Init() {
+	llssa.Initialize(llssa.InitAll)
+	llssa.SetDebug(llssa.DbgFlagAll)
+	cl.SetDebug(cl.DbgFlagAll)
+}
+
+func Do(inFile, outFile string) {
+	ret := Gen(inFile, nil)
+	err := os.WriteFile(outFile, []byte(ret), 0644)
+	check(err)
+}
+
+func Gen(inFile string, src any) string {
+	fset := token.NewFileSet()
+	f, err := parser.ParseFile(fset, inFile, src, parser.ParseComments)
+	check(err)
+
+	files := []*ast.File{f}
+	name := f.Name.Name
+	pkg := types.NewPackage(name, name)
+	ssaPkg, _, err := ssautil.BuildPackage(
+		&types.Config{Importer: importer.Default()}, fset, pkg, files, ssa.SanityCheckFunctions)
+	check(err)
+
+	ssaPkg.WriteTo(os.Stderr)
+
+	prog := llssa.NewProgram(nil)
+	ret, err := cl.NewPackage(prog, ssaPkg, nil)
+	check(err)
+
+	return ret.String()
+}
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}