test: add regression test for embedunexport-1598 (#1597)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: luoliwoshang

_demo/go/embedunexport-1598/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"go/token"
+	"go/types"
+)
+
+// wrappedFunc embeds *types.Func to implement types.Object
+type wrappedFunc struct {
+	*types.Func
+}
+
+func main() {
+	pkg := types.NewPackage("test", "test")
+	scope := pkg.Scope()
+
+	sig := types.NewSignatureType(nil, nil, nil, nil, nil, false)
+	fn := types.NewFunc(token.NoPos, pkg, "testFunc", sig)
+
+	wrapped := &wrappedFunc{Func: fn}
+	var obj types.Object = wrapped
+
+	scope.Insert(obj)
+}

cl/_testdata/embedunexport/embedunexport.go

@@ -0,0 +1,29 @@
+package embedunexport
+
+// Object is an interface with both exported and unexported methods
+type Object interface {
+	Name() string
+	setName(string)
+}
+
+// Base implements Object
+type Base struct {
+	name string
+}
+
+func (b *Base) Name() string {
+	return b.name
+}
+
+func (b *Base) setName(name string) {
+	b.name = name
+}
+
+func NewBase(name string) *Base {
+	return &Base{name: name}
+}
+
+// Use calls the unexported method through interface
+func Use(obj Object) {
+	obj.setName("modified")
+}

cl/_testdata/embedunexport/out.ll

@@ -0,0 +1,62 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testdata/embedunexport'
+source_filename = "github.com/goplus/llgo/cl/_testdata/embedunexport"
+
+%"github.com/goplus/llgo/runtime/internal/runtime.String" = type { ptr, i64 }
+%"github.com/goplus/llgo/cl/_testdata/embedunexport.Base" = type { %"github.com/goplus/llgo/runtime/internal/runtime.String" }
+%"github.com/goplus/llgo/runtime/internal/runtime.iface" = type { ptr, ptr }
+
+@"github.com/goplus/llgo/cl/_testdata/embedunexport.init$guard" = global i1 false, align 1
+@0 = private unnamed_addr constant [8 x i8] c"modified", align 1
+
+define %"github.com/goplus/llgo/runtime/internal/runtime.String" @"github.com/goplus/llgo/cl/_testdata/embedunexport.(*Base).Name"(ptr %0) {
+_llgo_0:
+  %1 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/embedunexport.Base", ptr %0, i32 0, i32 0
+  %2 = load %"github.com/goplus/llgo/runtime/internal/runtime.String", ptr %1, align 8
+  ret %"github.com/goplus/llgo/runtime/internal/runtime.String" %2
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/embedunexport.(*Base).setName"(ptr %0, %"github.com/goplus/llgo/runtime/internal/runtime.String" %1) {
+_llgo_0:
+  %2 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/embedunexport.Base", ptr %0, i32 0, i32 0
+  store %"github.com/goplus/llgo/runtime/internal/runtime.String" %1, ptr %2, align 8
+  ret void
+}
+
+define ptr @"github.com/goplus/llgo/cl/_testdata/embedunexport.NewBase"(%"github.com/goplus/llgo/runtime/internal/runtime.String" %0) {
+_llgo_0:
+  %1 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocZ"(i64 16)
+  %2 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/embedunexport.Base", ptr %1, i32 0, i32 0
+  store %"github.com/goplus/llgo/runtime/internal/runtime.String" %0, ptr %2, align 8
+  ret ptr %1
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/embedunexport.Use"(%"github.com/goplus/llgo/runtime/internal/runtime.iface" %0) {
+_llgo_0:
+  %1 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.IfacePtrData"(%"github.com/goplus/llgo/runtime/internal/runtime.iface" %0)
+  %2 = extractvalue %"github.com/goplus/llgo/runtime/internal/runtime.iface" %0, 0
+  %3 = getelementptr ptr, ptr %2, i64 4
+  %4 = load ptr, ptr %3, align 8
+  %5 = insertvalue { ptr, ptr } undef, ptr %4, 0
+  %6 = insertvalue { ptr, ptr } %5, ptr %1, 1
+  %7 = extractvalue { ptr, ptr } %6, 1
+  %8 = extractvalue { ptr, ptr } %6, 0
+  call void %8(ptr %7, %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @0, i64 8 })
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/embedunexport.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testdata/embedunexport.init$guard", align 1
+  br i1 %0, label %_llgo_2, label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testdata/embedunexport.init$guard", align 1
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocZ"(i64)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.IfacePtrData"(%"github.com/goplus/llgo/runtime/internal/runtime.iface")

cl/_testgo/embedunexport-1598/in.go

@@ -0,0 +1,19 @@
+package main
+
+import "github.com/goplus/llgo/cl/_testdata/embedunexport"
+
+// Wrapped embeds *embedunexport.Base to implement embedunexport.Object
+type Wrapped struct {
+	*embedunexport.Base
+}
+
+func main() {
+	base := embedunexport.NewBase("test")
+	wrapped := &Wrapped{Base: base}
+
+	// This should work: calling unexported method through interface
+	var obj embedunexport.Object = wrapped
+	embedunexport.Use(obj)
+
+	println(obj.Name())
+}