build: link globals importpath.name=value

ssa/globals.go

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2025 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 ssa
+
+import (
+	"fmt"
+
+	"github.com/goplus/llvm"
+)
+
+func (pkg Package) AddGlobalString(name string, value string) {
+	prog := pkg.Prog
+	styp := prog.String()
+	data := pkg.createGlobalStr(value)
+	length := prog.IntVal(uint64(len(value)), prog.Uintptr())
+	cv := llvm.ConstNamedStruct(styp.ll, []llvm.Value{data, length.impl})
+	pkg.NewVarEx(name, prog.Pointer(styp)).Init(Expr{cv, styp})
+}
+
+// Undefined global string var by names
+func (pkg Package) Undefined(names ...string) error {
+	prog := pkg.Prog
+	styp := prog.rtString()
+	for _, name := range names {
+		global := pkg.VarOf(name)
+		if global == nil {
+			continue
+		}
+		typ := prog.Elem(global.Type)
+		if typ.ll != styp {
+			return fmt.Errorf("%s: not a var of type string (type:%v)", name, typ.RawType())
+		}
+		newGlobal := llvm.AddGlobal(pkg.mod, styp, "")
+		global.impl.ReplaceAllUsesWith(newGlobal)
+		global.impl.EraseFromParentAsGlobal()
+		newGlobal.SetName(name)
+	}
+	return nil
+}