defer: enable loop lowering

ssa/eh_loop_test.go

@@ -0,0 +1,53 @@
+//go:build !llgo
+
+/*
+ * 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_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/goplus/llgo/ssa"
+	"github.com/goplus/llgo/ssa/ssatest"
+)
+
+func TestDeferInLoopIR(t *testing.T) {
+	prog := ssatest.NewProgram(t, nil)
+	pkg := prog.NewPackage("foo", "foo")
+
+	callee := pkg.NewFunc("callee", ssa.NoArgsNoRet, ssa.InGo)
+	cb := callee.MakeBody(1)
+	cb.Return()
+	cb.EndBuild()
+
+	fn := pkg.NewFunc("main", ssa.NoArgsNoRet, ssa.InGo)
+	b := fn.MakeBody(1)
+	fn.SetRecover(fn.MakeBlock())
+
+	// Ensure entry block has a terminator like real codegen
+	b.Return()
+	b.SetBlockEx(fn.Block(0), ssa.BeforeLast, true)
+
+	b.Defer(ssa.DeferInLoop, callee.Expr)
+	b.EndBuild()
+
+	ir := pkg.Module().String()
+	if !strings.Contains(ir, "icmp ne ptr") {
+		t.Fatalf("expected loop defer condition in IR, got:\n%s", ir)
+	}
+}