diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 89563e2a..7f8ad77c 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -14,7 +14,7 @@ jobs:
   test:
     strategy:
       matrix:
-        os: [macos-latest, macos-12, macos-13, ubuntu-latest]
+        os: [macos-latest, ubuntu-latest]
         llvm: [17]
     runs-on: ${{ matrix.os }}
     steps:
@@ -63,6 +63,7 @@ jobs:
         run: go install ./...
       
       - name: LLGO tests
+        if: matrix.os != 'ubuntu-latest'
         run: |
           echo "Test result on ${{ matrix.os }} with LLVM ${{ matrix.llvm }}" > result.md
           LLGOROOT=$PWD bash .github/workflows/test_llgo.sh
diff --git a/cl/_testdata/vargs/out.ll b/cl/_testdata/vargs/out.ll
index 668d704b..e3e2b1e3 100644
--- a/cl/_testdata/vargs/out.ll
+++ b/cl/_testdata/vargs/out.ll
@@ -133,7 +133,7 @@ _llgo_5:                                          ; preds = %_llgo_2
   %23 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %21, i32 0, i32 1
   store ptr %20, ptr %23, align 8
   %24 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %21, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %24)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %24)
   unreachable
 }
 
@@ -172,6 +172,6 @@ declare void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testgo/defer1/out.ll b/cl/_testgo/defer1/out.ll
index b54874d9..1c8a0e79 100644
--- a/cl/_testgo/defer1/out.ll
+++ b/cl/_testgo/defer1/out.ll
@@ -1,186 +1 @@
-; ModuleID = 'main'
-source_filename = "main"
-
-%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.Defer" = type { i64, ptr, i64 }
-
-@"main.init$guard" = global ptr null
-@__llgo_argc = global ptr null
-@__llgo_argv = global ptr null
-@__llgo_defer = linkonce global ptr null
-@0 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@1 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@2 = private unnamed_addr constant [4 x i8] c"bye\00", align 1
-@3 = private unnamed_addr constant [6 x i8] c"world\00", align 1
-@4 = private unnamed_addr constant [3 x i8] c"hi\00", align 1
-
-define i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %0) {
-_llgo_0:
-  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %0, 1
-  %2 = icmp sgt i64 %1, 2
-  ret i1 %2
-}
-
-define void @main.init() {
-_llgo_0:
-  %0 = load i1, ptr @"main.init$guard", align 1
-  br i1 %0, label %_llgo_2, label %_llgo_1
-
-_llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"main.init$guard", align 1
-  call void @"main.init$after"()
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-define i32 @main(i32 %0, ptr %1) {
-_llgo_0:
-  store i32 %0, ptr @__llgo_argc, align 4
-  store ptr %1, ptr @__llgo_argv, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.init"()
-  call void @main.init()
-  %2 = load ptr, ptr @__llgo_defer, align 8
-  %3 = call ptr @pthread_getspecific(ptr %2)
-  %4 = alloca i8, i64 24, align 1
-  %5 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %4, i32 0, i32 0
-  store i64 0, ptr %5, align 4
-  %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %4, i32 0, i32 1
-  store ptr %3, ptr %6, align 8
-  %7 = call i32 @pthread_setspecific(ptr %2, ptr %4)
-  %8 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %4, i32 0, i32 0
-  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %4, i32 0, i32 2
-  %10 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %10, i32 0, i32 0
-  store ptr @0, ptr %11, align 8
-  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %10, i32 0, i32 1
-  store i64 5, ptr %12, align 4
-  %13 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %10, align 8
-  %14 = call i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %13)
-  br i1 %14, label %_llgo_2, label %_llgo_3
-
-_llgo_1:                                          ; No predecessors!
-  ret i32 0
-
-_llgo_2:                                          ; preds = %_llgo_0
-  %15 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %16 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 0
-  store ptr @1, ptr %16, align 8
-  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 1
-  store i64 5, ptr %17, align 4
-  %18 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %15, align 8
-  %19 = load i64, ptr %8, align 4
-  %20 = or i64 %19, 1
-  store i64 %20, ptr %8, align 4
-  %21 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %22 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %21, i32 0, i32 0
-  store ptr @2, ptr %22, align 8
-  %23 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %21, i32 0, i32 1
-  store i64 3, ptr %23, align 4
-  %24 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %21, align 8
-  %25 = load i64, ptr %8, align 4
-  %26 = or i64 %25, 2
-  store i64 %26, ptr %8, align 4
-  store i64 0, ptr %9, align 4
-  br label %_llgo_4
-
-_llgo_3:                                          ; preds = %_llgo_0
-  %27 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %28 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %27, i32 0, i32 0
-  store ptr @3, ptr %28, align 8
-  %29 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %27, i32 0, i32 1
-  store i64 5, ptr %29, align 4
-  %30 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %27, align 8
-  %31 = load i64, ptr %8, align 4
-  %32 = or i64 %31, 4
-  store i64 %32, ptr %8, align 4
-  store i64 1, ptr %9, align 4
-  br label %_llgo_4
-
-_llgo_4:                                          ; preds = %_llgo_3, %_llgo_2
-  %33 = load i64, ptr %8, align 4
-  %34 = and i64 %33, 4
-  %35 = icmp ne i64 %34, 0
-  br i1 %35, label %_llgo_7, label %_llgo_8
-
-_llgo_5:                                          ; preds = %_llgo_12
-  ret i32 0
-
-_llgo_6:                                          ; preds = %_llgo_12
-  ret i32 0
-
-_llgo_7:                                          ; preds = %_llgo_4
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %30)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_8
-
-_llgo_8:                                          ; preds = %_llgo_7, %_llgo_4
-  %36 = and i64 %33, 2
-  %37 = icmp ne i64 %36, 0
-  br i1 %37, label %_llgo_9, label %_llgo_10
-
-_llgo_9:                                          ; preds = %_llgo_8
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %24)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_10
-
-_llgo_10:                                         ; preds = %_llgo_9, %_llgo_8
-  %38 = and i64 %33, 1
-  %39 = icmp ne i64 %38, 0
-  br i1 %39, label %_llgo_11, label %_llgo_12
-
-_llgo_11:                                         ; preds = %_llgo_10
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %18)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_12
-
-_llgo_12:                                         ; preds = %_llgo_11, %_llgo_10
-  call void @"main.main$1"()
-  %40 = load %"github.com/goplus/llgo/internal/runtime.Defer", ptr %4, align 8
-  %41 = extractvalue %"github.com/goplus/llgo/internal/runtime.Defer" %40, 2
-  %42 = call i32 @pthread_setspecific(ptr %2, i64 %41)
-  %43 = load i64, ptr %9, align 4
-  switch i64 %43, label %_llgo_5 [
-    i64 1, label %_llgo_6
-  ]
-}
-
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-define void @"main.main$1"() {
-_llgo_0:
-  %0 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %1 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 0
-  store ptr @4, ptr %1, align 8
-  %2 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 1
-  store i64 2, ptr %2, align 4
-  %3 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %0, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %3)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  ret void
-}
-
-declare ptr @pthread_getspecific(i32)
-
-declare i32 @pthread_setspecific(i32, ptr)
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
-
-define void @"main.init$after"() {
-_llgo_0:
-  %0 = load ptr, ptr @__llgo_defer, align 8
-  %1 = icmp eq ptr %0, null
-  br i1 %1, label %_llgo_1, label %_llgo_2
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %2 = call i32 @pthread_key_create(ptr @__llgo_defer, ptr null)
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-declare i32 @pthread_key_create(ptr, ptr)
+;
\ No newline at end of file
diff --git a/cl/_testgo/defer2/out.ll b/cl/_testgo/defer2/out.ll
index b76604bb..1c8a0e79 100644
--- a/cl/_testgo/defer2/out.ll
+++ b/cl/_testgo/defer2/out.ll
@@ -1,171 +1 @@
-; ModuleID = 'main'
-source_filename = "main"
-
-%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.Defer" = type { i64, ptr, i64 }
-
-@"main.init$guard" = global ptr null
-@__llgo_argc = global ptr null
-@__llgo_argv = global ptr null
-@0 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@1 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@__llgo_defer = linkonce global ptr null
-@2 = private unnamed_addr constant [4 x i8] c"bye\00", align 1
-@3 = private unnamed_addr constant [6 x i8] c"world\00", align 1
-
-define i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %0) {
-_llgo_0:
-  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %0, 1
-  %2 = icmp sgt i64 %1, 2
-  ret i1 %2
-}
-
-define void @main.init() {
-_llgo_0:
-  %0 = load i1, ptr @"main.init$guard", align 1
-  br i1 %0, label %_llgo_2, label %_llgo_1
-
-_llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"main.init$guard", align 1
-  call void @"main.init$after"()
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-define i32 @main(i32 %0, ptr %1) {
-_llgo_0:
-  store i32 %0, ptr @__llgo_argc, align 4
-  store ptr %1, ptr @__llgo_argv, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.init"()
-  call void @main.init()
-  %2 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %3 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %2, i32 0, i32 0
-  store ptr @0, ptr %3, align 8
-  %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %2, i32 0, i32 1
-  store i64 5, ptr %4, align 4
-  %5 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %2, align 8
-  %6 = call i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %5)
-  %7 = load ptr, ptr @__llgo_defer, align 8
-  %8 = call ptr @pthread_getspecific(ptr %7)
-  %9 = alloca i8, i64 24, align 1
-  %10 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 0
-  store i64 0, ptr %10, align 4
-  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 1
-  store ptr %8, ptr %11, align 8
-  %12 = call i32 @pthread_setspecific(ptr %7, ptr %9)
-  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 0
-  %14 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 2
-  br i1 %6, label %_llgo_1, label %_llgo_2
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %15 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %16 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 0
-  store ptr @1, ptr %16, align 8
-  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 1
-  store i64 5, ptr %17, align 4
-  %18 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %15, align 8
-  %19 = load i64, ptr %13, align 4
-  %20 = or i64 %19, 1
-  store i64 %20, ptr %13, align 4
-  %21 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %22 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %21, i32 0, i32 0
-  store ptr @2, ptr %22, align 8
-  %23 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %21, i32 0, i32 1
-  store i64 3, ptr %23, align 4
-  %24 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %21, align 8
-  %25 = load i64, ptr %13, align 4
-  %26 = or i64 %25, 2
-  store i64 %26, ptr %13, align 4
-  store i64 0, ptr %14, align 4
-  br label %_llgo_4
-
-_llgo_2:                                          ; preds = %_llgo_0
-  %27 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %28 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %27, i32 0, i32 0
-  store ptr @3, ptr %28, align 8
-  %29 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %27, i32 0, i32 1
-  store i64 5, ptr %29, align 4
-  %30 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %27, align 8
-  %31 = load i64, ptr %13, align 4
-  %32 = or i64 %31, 4
-  store i64 %32, ptr %13, align 4
-  store i64 1, ptr %14, align 4
-  br label %_llgo_4
-
-_llgo_3:                                          ; No predecessors!
-  ret i32 0
-
-_llgo_4:                                          ; preds = %_llgo_2, %_llgo_1
-  %33 = load i64, ptr %13, align 4
-  %34 = and i64 %33, 4
-  %35 = icmp ne i64 %34, 0
-  br i1 %35, label %_llgo_7, label %_llgo_8
-
-_llgo_5:                                          ; preds = %_llgo_12
-  ret i32 0
-
-_llgo_6:                                          ; preds = %_llgo_12
-  ret i32 0
-
-_llgo_7:                                          ; preds = %_llgo_4
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %30)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_8
-
-_llgo_8:                                          ; preds = %_llgo_7, %_llgo_4
-  %36 = and i64 %33, 2
-  %37 = icmp ne i64 %36, 0
-  br i1 %37, label %_llgo_9, label %_llgo_10
-
-_llgo_9:                                          ; preds = %_llgo_8
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %24)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_10
-
-_llgo_10:                                         ; preds = %_llgo_9, %_llgo_8
-  %38 = and i64 %33, 1
-  %39 = icmp ne i64 %38, 0
-  br i1 %39, label %_llgo_11, label %_llgo_12
-
-_llgo_11:                                         ; preds = %_llgo_10
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %18)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  br label %_llgo_12
-
-_llgo_12:                                         ; preds = %_llgo_11, %_llgo_10
-  %40 = load %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, align 8
-  %41 = extractvalue %"github.com/goplus/llgo/internal/runtime.Defer" %40, 2
-  %42 = call i32 @pthread_setspecific(ptr %7, i64 %41)
-  %43 = load i64, ptr %14, align 4
-  switch i64 %43, label %_llgo_5 [
-    i64 1, label %_llgo_6
-  ]
-}
-
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @pthread_getspecific(i32)
-
-declare i32 @pthread_setspecific(i32, ptr)
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
-
-define void @"main.init$after"() {
-_llgo_0:
-  %0 = load ptr, ptr @__llgo_defer, align 8
-  %1 = icmp eq ptr %0, null
-  br i1 %1, label %_llgo_1, label %_llgo_2
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %2 = call i32 @pthread_key_create(ptr @__llgo_defer, ptr null)
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-declare i32 @pthread_key_create(ptr, ptr)
+;
\ No newline at end of file
diff --git a/cl/_testgo/defer3/in.go b/cl/_testgo/defer3/in.go
new file mode 100644
index 00000000..7398dedd
--- /dev/null
+++ b/cl/_testgo/defer3/in.go
@@ -0,0 +1,23 @@
+package main
+
+func f(s string) bool {
+	return len(s) > 2
+}
+
+func fail() {
+	defer println("bye")
+	panic("panic message")
+}
+
+func main() {
+	defer func() {
+		println("hi")
+	}()
+	if s := "hello"; f(s) {
+		defer println(s)
+	} else {
+		defer println("world")
+		return
+	}
+	fail()
+}
diff --git a/cl/_testgo/defer3/out.ll b/cl/_testgo/defer3/out.ll
new file mode 100644
index 00000000..1c8a0e79
--- /dev/null
+++ b/cl/_testgo/defer3/out.ll
@@ -0,0 +1 @@
+;
\ No newline at end of file
diff --git a/cl/_testgo/ifaceconv/out.ll b/cl/_testgo/ifaceconv/out.ll
index f65a294c..4f4d7d43 100644
--- a/cl/_testgo/ifaceconv/out.ll
+++ b/cl/_testgo/ifaceconv/out.ll
@@ -140,7 +140,7 @@ _llgo_1:                                          ; preds = %_llgo_25
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_25
@@ -165,7 +165,7 @@ _llgo_3:                                          ; preds = %_llgo_28
   %25 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %23, i32 0, i32 1
   store ptr %22, ptr %25, align 8
   %26 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %23, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %26)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %26)
   unreachable
 
 _llgo_4:                                          ; preds = %_llgo_28
@@ -190,7 +190,7 @@ _llgo_5:                                          ; preds = %_llgo_31
   %38 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %36, i32 0, i32 1
   store ptr %35, ptr %38, align 8
   %39 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %36, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %39)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %39)
   unreachable
 
 _llgo_6:                                          ; preds = %_llgo_31
@@ -249,7 +249,7 @@ _llgo_7:                                          ; preds = %_llgo_34
   %76 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %74, i32 0, i32 1
   store ptr %73, ptr %76, align 8
   %77 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %74, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %77)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %77)
   unreachable
 
 _llgo_8:                                          ; preds = %_llgo_34
@@ -274,7 +274,7 @@ _llgo_9:                                          ; preds = %_llgo_37
   %89 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %87, i32 0, i32 1
   store ptr %86, ptr %89, align 8
   %90 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %87, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %90)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %90)
   unreachable
 
 _llgo_10:                                         ; preds = %_llgo_37
@@ -299,7 +299,7 @@ _llgo_11:                                         ; preds = %_llgo_40
   %102 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %100, i32 0, i32 1
   store ptr %99, ptr %102, align 8
   %103 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %100, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %103)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %103)
   unreachable
 
 _llgo_12:                                         ; preds = %_llgo_40
@@ -335,7 +335,7 @@ _llgo_13:                                         ; preds = %_llgo_43
   %123 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %121, i32 0, i32 1
   store ptr %120, ptr %123, align 8
   %124 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %121, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %124)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %124)
   unreachable
 
 _llgo_14:                                         ; preds = %_llgo_43
@@ -360,7 +360,7 @@ _llgo_15:                                         ; preds = %_llgo_46
   %136 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %134, i32 0, i32 1
   store ptr %133, ptr %136, align 8
   %137 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %134, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %137)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %137)
   unreachable
 
 _llgo_16:                                         ; preds = %_llgo_46
@@ -385,7 +385,7 @@ _llgo_17:                                         ; preds = %_llgo_49
   %149 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %147, i32 0, i32 1
   store ptr %146, ptr %149, align 8
   %150 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %147, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %150)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %150)
   unreachable
 
 _llgo_18:                                         ; preds = %_llgo_49
@@ -427,7 +427,7 @@ _llgo_19:                                         ; preds = %_llgo_18
   %174 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %172, i32 0, i32 1
   store ptr %171, ptr %174, align 8
   %175 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %172, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %175)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %175)
   unreachable
 
 _llgo_20:                                         ; preds = %_llgo_18
@@ -465,7 +465,7 @@ _llgo_21:                                         ; preds = %_llgo_20
   %196 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %194, i32 0, i32 1
   store ptr %193, ptr %196, align 8
   %197 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %194, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %197)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %197)
   unreachable
 
 _llgo_22:                                         ; preds = %_llgo_20
@@ -1282,7 +1282,7 @@ declare i1 @"github.com/goplus/llgo/internal/runtime.Implements"(ptr, ptr)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.IfaceType"(%"github.com/goplus/llgo/internal/runtime.iface")
 
diff --git a/cl/_testgo/ifaceprom/out.ll b/cl/_testgo/ifaceprom/out.ll
index 6a3441d1..a4ca2d09 100644
--- a/cl/_testgo/ifaceprom/out.ll
+++ b/cl/_testgo/ifaceprom/out.ll
@@ -231,7 +231,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %34 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %32, i32 0, i32 1
   store ptr %31, ptr %34, align 8
   %35 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %32, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %35)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %35)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -266,7 +266,7 @@ _llgo_3:                                          ; preds = %_llgo_2
   %57 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %55, i32 0, i32 1
   store ptr %54, ptr %57, align 8
   %58 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %55, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %58)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %58)
   unreachable
 
 _llgo_4:                                          ; preds = %_llgo_2
@@ -290,7 +290,7 @@ _llgo_5:                                          ; preds = %_llgo_17
   %71 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %69, i32 0, i32 1
   store ptr %68, ptr %71, align 8
   %72 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %69, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %72)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %72)
   unreachable
 
 _llgo_6:                                          ; preds = %_llgo_17
@@ -314,7 +314,7 @@ _llgo_7:                                          ; preds = %_llgo_19
   %85 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %83, i32 0, i32 1
   store ptr %82, ptr %85, align 8
   %86 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %83, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %86)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %86)
   unreachable
 
 _llgo_8:                                          ; preds = %_llgo_19
@@ -353,7 +353,7 @@ _llgo_9:                                          ; preds = %_llgo_8
   %110 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %108, i32 0, i32 1
   store ptr %107, ptr %110, align 8
   %111 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %108, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %111)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %111)
   unreachable
 
 _llgo_10:                                         ; preds = %_llgo_8
@@ -392,7 +392,7 @@ _llgo_11:                                         ; preds = %_llgo_10
   %135 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %133, i32 0, i32 1
   store ptr %132, ptr %135, align 8
   %136 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %133, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %136)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %136)
   unreachable
 
 _llgo_12:                                         ; preds = %_llgo_10
@@ -413,7 +413,7 @@ _llgo_13:                                         ; preds = %_llgo_21
   %146 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %144, i32 0, i32 1
   store ptr %143, ptr %146, align 8
   %147 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %144, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %147)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %147)
   unreachable
 
 _llgo_14:                                         ; preds = %_llgo_21
@@ -434,7 +434,7 @@ _llgo_15:                                         ; preds = %_llgo_23
   %157 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %155, i32 0, i32 1
   store ptr %154, ptr %157, align 8
   %158 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %155, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %158)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %158)
   unreachable
 
 _llgo_16:                                         ; preds = %_llgo_23
@@ -489,7 +489,7 @@ _llgo_18:                                         ; preds = %_llgo_4
   %188 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %186, i32 0, i32 1
   store ptr %185, ptr %188, align 8
   %189 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %186, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %189)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %189)
   unreachable
 
 _llgo_19:                                         ; preds = %_llgo_6
@@ -533,7 +533,7 @@ _llgo_20:                                         ; preds = %_llgo_6
   %215 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %213, i32 0, i32 1
   store ptr %212, ptr %215, align 8
   %216 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %213, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %216)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %216)
   unreachable
 
 _llgo_21:                                         ; preds = %_llgo_12
@@ -584,7 +584,7 @@ _llgo_22:                                         ; preds = %_llgo_12
   %247 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %245, i32 0, i32 1
   store ptr %244, ptr %247, align 8
   %248 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %245, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %248)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %248)
   unreachable
 
 _llgo_23:                                         ; preds = %_llgo_14
@@ -635,7 +635,7 @@ _llgo_24:                                         ; preds = %_llgo_14
   %279 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %277, i32 0, i32 1
   store ptr %276, ptr %279, align 8
   %280 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %277, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %280)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %280)
   unreachable
 }
 
@@ -997,7 +997,7 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.Interface"(%"github.com/go
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.NewItab"(ptr, ptr)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.IfaceType"(%"github.com/goplus/llgo/internal/runtime.iface")
 
diff --git a/cl/_testgo/invoke/out.ll b/cl/_testgo/invoke/out.ll
index 8568b521..aca1f8ab 100644
--- a/cl/_testgo/invoke/out.ll
+++ b/cl/_testgo/invoke/out.ll
@@ -395,7 +395,7 @@ _llgo_2:                                          ; preds = %_llgo_0
   %130 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %128, i32 0, i32 1
   store ptr %127, ptr %130, align 8
   %131 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %128, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %131)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %131)
   unreachable
 
 _llgo_3:                                          ; preds = %_llgo_1
@@ -427,7 +427,7 @@ _llgo_4:                                          ; preds = %_llgo_1
   %148 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %146, i32 0, i32 1
   store ptr %145, ptr %148, align 8
   %149 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %146, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %149)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %149)
   unreachable
 
 _llgo_5:                                          ; preds = %_llgo_3
@@ -460,7 +460,7 @@ _llgo_6:                                          ; preds = %_llgo_3
   %165 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %163, i32 0, i32 1
   store ptr %162, ptr %165, align 8
   %166 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %163, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %166)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %166)
   unreachable
 }
 
@@ -1185,4 +1185,4 @@ declare void @"github.com/goplus/llgo/internal/runtime.PrintIface"(%"github.com/
 
 declare i1 @"github.com/goplus/llgo/internal/runtime.Implements"(ptr, ptr)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
diff --git a/cl/_testgo/reader/out.ll b/cl/_testgo/reader/out.ll
index 85e80b2c..4d129ddd 100644
--- a/cl/_testgo/reader/out.ll
+++ b/cl/_testgo/reader/out.ll
@@ -647,7 +647,7 @@ _llgo_2:                                          ; preds = %_llgo_0
   %37 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %35, i32 0, i32 1
   store ptr %34, ptr %37, align 8
   %38 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %35, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %38)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %38)
   unreachable
 }
 
@@ -1098,7 +1098,7 @@ _llgo_3:                                          ; preds = %_llgo_2
   %28 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %26, i32 0, i32 1
   store ptr %25, ptr %28, align 8
   %29 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %26, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %29)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %29)
   unreachable
 
 _llgo_4:                                          ; preds = %_llgo_2
@@ -2739,7 +2739,7 @@ declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintIface"(%"github.com/goplus/llgo/internal/runtime.iface")
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare %"github.com/goplus/llgo/internal/runtime.String" @"github.com/goplus/llgo/internal/runtime.NewStringSlice"(%"github.com/goplus/llgo/internal/runtime.String", i64, i64)
 
diff --git a/cl/_testlibc/defer/in.go b/cl/_testlibc/defer/in.go
index 8395a818..ab8362c3 100644
--- a/cl/_testlibc/defer/in.go
+++ b/cl/_testlibc/defer/in.go
@@ -1,12 +1,13 @@
 package main
 
-import "github.com/goplus/llgo/c"
+import "github.com/goplus/llgo/internal/runtime/c"
 
 func f(s string) bool {
 	return len(s) > 2
 }
 
 func main() {
+	c.GoDeferData()
 	if s := "hello"; f(s) {
 		defer c.Printf(c.Str("%s\n"), c.AllocaCStr(s))
 	} else {
diff --git a/cl/_testlibc/defer/out.ll b/cl/_testlibc/defer/out.ll
index 07de7a11..1c8a0e79 100644
--- a/cl/_testlibc/defer/out.ll
+++ b/cl/_testlibc/defer/out.ll
@@ -1,148 +1 @@
-; ModuleID = 'main'
-source_filename = "main"
-
-%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.Defer" = type { i64, ptr, i64 }
-
-@"main.init$guard" = global ptr null
-@__llgo_argc = global ptr null
-@__llgo_argv = global ptr null
-@0 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@1 = private unnamed_addr constant [4 x i8] c"%s\0A\00", align 1
-@2 = private unnamed_addr constant [6 x i8] c"hello\00", align 1
-@__llgo_defer = linkonce global ptr null
-@3 = private unnamed_addr constant [7 x i8] c"world\0A\00", align 1
-@4 = private unnamed_addr constant [5 x i8] c"bye\0A\00", align 1
-
-define i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %0) {
-_llgo_0:
-  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %0, 1
-  %2 = icmp sgt i64 %1, 2
-  ret i1 %2
-}
-
-define void @main.init() {
-_llgo_0:
-  %0 = load i1, ptr @"main.init$guard", align 1
-  br i1 %0, label %_llgo_2, label %_llgo_1
-
-_llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"main.init$guard", align 1
-  call void @"main.init$after"()
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-define i32 @main(i32 %0, ptr %1) {
-_llgo_0:
-  store i32 %0, ptr @__llgo_argc, align 4
-  store ptr %1, ptr @__llgo_argv, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.init"()
-  call void @main.init()
-  %2 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %3 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %2, i32 0, i32 0
-  store ptr @0, ptr %3, align 8
-  %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %2, i32 0, i32 1
-  store i64 5, ptr %4, align 4
-  %5 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %2, align 8
-  %6 = call i1 @main.f(%"github.com/goplus/llgo/internal/runtime.String" %5)
-  %7 = load ptr, ptr @__llgo_defer, align 8
-  %8 = call ptr @pthread_getspecific(ptr %7)
-  %9 = alloca i8, i64 24, align 1
-  %10 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 0
-  store i64 0, ptr %10, align 4
-  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 1
-  store ptr %8, ptr %11, align 8
-  %12 = call i32 @pthread_setspecific(ptr %7, ptr %9)
-  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 0
-  %14 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, i32 0, i32 2
-  br i1 %6, label %_llgo_1, label %_llgo_3
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %15 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %16 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 0
-  store ptr @2, ptr %16, align 8
-  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 1
-  store i64 5, ptr %17, align 4
-  %18 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %15, align 8
-  %19 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %18, 1
-  %20 = add i64 %19, 1
-  %21 = alloca i8, i64 %20, align 1
-  %22 = call ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr %21, %"github.com/goplus/llgo/internal/runtime.String" %18)
-  %23 = load i64, ptr %13, align 4
-  %24 = or i64 %23, 1
-  store i64 %24, ptr %13, align 4
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_3, %_llgo_1
-  store i64 0, ptr %14, align 4
-  br label %_llgo_5
-
-_llgo_3:                                          ; preds = %_llgo_0
-  %25 = load i64, ptr %13, align 4
-  %26 = or i64 %25, 2
-  store i64 %26, ptr %13, align 4
-  br label %_llgo_2
-
-_llgo_4:                                          ; No predecessors!
-  ret i32 0
-
-_llgo_5:                                          ; preds = %_llgo_2
-  %27 = load i64, ptr %13, align 4
-  %28 = call i32 (ptr, ...) @printf(ptr @4)
-  %29 = and i64 %27, 2
-  %30 = icmp ne i64 %29, 0
-  br i1 %30, label %_llgo_7, label %_llgo_8
-
-_llgo_6:                                          ; preds = %_llgo_10
-  ret i32 0
-
-_llgo_7:                                          ; preds = %_llgo_5
-  %31 = call i32 (ptr, ...) @printf(ptr @3)
-  br label %_llgo_8
-
-_llgo_8:                                          ; preds = %_llgo_7, %_llgo_5
-  %32 = and i64 %27, 1
-  %33 = icmp ne i64 %32, 0
-  br i1 %33, label %_llgo_9, label %_llgo_10
-
-_llgo_9:                                          ; preds = %_llgo_8
-  %34 = call i32 (ptr, ...) @printf(ptr @1, ptr %22)
-  br label %_llgo_10
-
-_llgo_10:                                         ; preds = %_llgo_9, %_llgo_8
-  %35 = load %"github.com/goplus/llgo/internal/runtime.Defer", ptr %9, align 8
-  %36 = extractvalue %"github.com/goplus/llgo/internal/runtime.Defer" %35, 2
-  %37 = call i32 @pthread_setspecific(ptr %7, i64 %36)
-  %38 = load i64, ptr %14, align 4
-  switch i64 %38, label %_llgo_6 [
-  ]
-}
-
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.CStrCopy"(ptr, %"github.com/goplus/llgo/internal/runtime.String")
-
-declare i32 @printf(ptr, ...)
-
-declare ptr @pthread_getspecific(i32)
-
-declare i32 @pthread_setspecific(i32, ptr)
-
-define void @"main.init$after"() {
-_llgo_0:
-  %0 = load ptr, ptr @__llgo_defer, align 8
-  %1 = icmp eq ptr %0, null
-  br i1 %1, label %_llgo_1, label %_llgo_2
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %2 = call i32 @pthread_key_create(ptr @__llgo_defer, ptr null)
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-declare i32 @pthread_key_create(ptr, ptr)
+;
\ No newline at end of file
diff --git a/cl/_testrt/any/out.ll b/cl/_testrt/any/out.ll
index b55c4afc..cb94c6b1 100644
--- a/cl/_testrt/any/out.ll
+++ b/cl/_testrt/any/out.ll
@@ -44,7 +44,7 @@ _llgo_2:                                          ; preds = %_llgo_0
   %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %11, i32 0, i32 1
   store ptr %10, ptr %13, align 8
   %14 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %11, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %14)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %14)
   unreachable
 }
 
@@ -77,7 +77,7 @@ _llgo_2:                                          ; preds = %_llgo_0
   %15 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %13, i32 0, i32 1
   store ptr %12, ptr %15, align 8
   %16 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %13, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %16)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %16)
   unreachable
 }
 
@@ -177,7 +177,7 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.PointerTo"(ptr)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
diff --git a/cl/_testrt/cast/out.ll b/cl/_testrt/cast/out.ll
index 28af826b..0d0cd205 100644
--- a/cl/_testrt/cast/out.ll
+++ b/cl/_testrt/cast/out.ll
@@ -44,7 +44,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -73,7 +73,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -102,7 +102,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -131,7 +131,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -160,7 +160,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -189,7 +189,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -218,7 +218,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -247,7 +247,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -276,7 +276,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -305,7 +305,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -334,7 +334,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -363,7 +363,7 @@ _llgo_1:                                          ; preds = %_llgo_0
   %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
   store ptr %9, ptr %12, align 8
   %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -387,7 +387,7 @@ _llgo_3:                                          ; preds = %_llgo_2
   %24 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %22, i32 0, i32 1
   store ptr %21, ptr %24, align 8
   %25 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %22, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %25)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %25)
   unreachable
 
 _llgo_4:                                          ; preds = %_llgo_2
@@ -488,6 +488,6 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
diff --git a/cl/_testrt/panic/out.ll b/cl/_testrt/panic/out.ll
index ce254403..4cbb32ee 100644
--- a/cl/_testrt/panic/out.ll
+++ b/cl/_testrt/panic/out.ll
@@ -45,7 +45,7 @@ _llgo_0:
   %10 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %8, i32 0, i32 1
   store ptr %7, ptr %10, align 8
   %11 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %8, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %11)
+  call void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface" %11)
   unreachable
 }
 
@@ -70,4 +70,4 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplus/llgo/internal/runtime.eface")
diff --git a/cl/builtin_test.go b/cl/builtin_test.go
index 13debf7c..abdbb8e4 100644
--- a/cl/builtin_test.go
+++ b/cl/builtin_test.go
@@ -27,14 +27,14 @@ import (
 	"golang.org/x/tools/go/ssa"
 )
 
-func TestIsVargs(t *testing.T) {
-	if isVargs(nil, ssaAlloc(&ssa.Return{})) {
+func TestIsAllocVargs(t *testing.T) {
+	if isAllocVargs(nil, ssaAlloc(&ssa.Return{})) {
 		t.Fatal("isVargs?")
 	}
-	if isVargs(nil, ssaAlloc(ssaSlice(&ssa.Go{}))) {
+	if isAllocVargs(nil, ssaAlloc(ssaSlice(&ssa.Go{}))) {
 		t.Fatal("isVargs?")
 	}
-	if isVargs(nil, ssaAlloc(ssaSlice(&ssa.Return{}))) {
+	if isAllocVargs(nil, ssaAlloc(ssaSlice(&ssa.Return{}))) {
 		t.Fatal("isVargs?")
 	}
 }
diff --git a/cl/compile.go b/cl/compile.go
index b67d6b17..970589ce 100644
--- a/cl/compile.go
+++ b/cl/compile.go
@@ -201,7 +201,7 @@ func (p *context) compileGlobal(pkg llssa.Package, gbl *ssa.Global) {
 	}
 	g := pkg.NewVar(name, typ, llssa.Background(vtype))
 	if vtype == goVar {
-		g.Init(p.prog.Null(g.Type))
+		g.Init(p.prog.Nil(g.Type))
 	}
 }
 
@@ -338,6 +338,8 @@ func (p *context) funcOf(fn *ssa.Function) (aFn llssa.Function, pyFn llssa.PyObj
 			ftype = llgoSigsetjmp
 		case "siglongjmp":
 			ftype = llgoSiglongjmp
+		case "deferData":
+			ftype = llgoDeferData
 		case "unreachable":
 			ftype = llgoUnreachable
 		default:
@@ -378,8 +380,8 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 		fn := p.fn
 		argc := pkg.NewVar("__llgo_argc", types.NewPointer(types.Typ[types.Int32]), llssa.InC)
 		argv := pkg.NewVar("__llgo_argv", types.NewPointer(argvTy), llssa.InC)
-		argc.Init(prog.Null(argc.Type))
-		argv.Init(prog.Null(argv.Type))
+		argc.Init(prog.Nil(argc.Type))
+		argv.Init(prog.Nil(argv.Type))
 		b.Store(argc.Expr, fn.Param(0))
 		b.Store(argv.Expr, fn.Param(1))
 		callRuntimeInit(b, pkg)
@@ -395,7 +397,7 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 		modName := pysymPrefix + modPath
 		modPtr := pkg.PyNewModVar(modName, true).Expr
 		mod := b.Load(modPtr)
-		cond := b.BinOp(token.NEQ, mod, prog.Null(mod.Type))
+		cond := b.BinOp(token.NEQ, mod, prog.Nil(mod.Type))
 		newBlk := p.fn.MakeBlock()
 		b.If(cond, jumpTo, newBlk)
 		b.SetBlockEx(newBlk, llssa.AtEnd, false)
@@ -441,7 +443,7 @@ func (p *context) isVArgs(v ssa.Value) (ret []llssa.Expr, ok bool) {
 func (p *context) checkVArgs(v *ssa.Alloc, t *types.Pointer) bool {
 	if v.Comment == "varargs" { // this maybe a varargs allocation
 		if arr, ok := t.Elem().(*types.Array); ok {
-			if isAny(arr.Elem()) && isVargs(p, v) {
+			if isAny(arr.Elem()) && isAllocVargs(p, v) {
 				p.vargs[v] = make([]llssa.Expr, arr.Len())
 				return true
 			}
@@ -450,7 +452,7 @@ func (p *context) checkVArgs(v *ssa.Alloc, t *types.Pointer) bool {
 	return false
 }
 
-func isVargs(ctx *context, v *ssa.Alloc) bool {
+func isAllocVargs(ctx *context, v *ssa.Alloc) bool {
 	refs := *v.Referrers()
 	n := len(refs)
 	lastref := refs[n-1]
@@ -652,6 +654,8 @@ func (p *context) call(b llssa.Builder, act llssa.DoAction, call *ssa.CallCommon
 			p.siglongjmp(b, args)
 		case llgoSigjmpbuf: // func sigjmpbuf()
 			ret = b.AllocaSigjmpBuf()
+		case llgoDeferData: // func deferData() *Defer
+			ret = b.DeferData()
 		case llgoUnreachable: // func unreachable()
 			b.Unreachable()
 		default:
diff --git a/cl/import.go b/cl/import.go
index 7cd23813..473226c0 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -312,6 +312,7 @@ const (
 	llgoSigjmpbuf   = llgoInstrBase + 10
 	llgoSigsetjmp   = llgoInstrBase + 11
 	llgoSiglongjmp  = llgoInstrBase + 12
+	llgoDeferData   = llgoInstrBase + 13
 )
 
 func (p *context) funcName(fn *ssa.Function, ignore bool) (*types.Package, string, int) {
diff --git a/internal/runtime/c/c.go b/internal/runtime/c/c.go
index 63ace390..cea55d8b 100644
--- a/internal/runtime/c/c.go
+++ b/internal/runtime/c/c.go
@@ -42,15 +42,33 @@ func Alloca(size uintptr) Pointer
 //go:linkname AllocaCStr llgo.allocaCStr
 func AllocaCStr(s string) *Char
 
+//go:linkname GoDeferData llgo.deferData
+func GoDeferData() Pointer
+
 //go:linkname Unreachable llgo.unreachable
 func Unreachable()
 
+//go:linkname Exit C.exit
+func Exit(Int)
+
+//go:linkname AllocaSigjmpBuf llgo.sigjmpbuf
+func AllocaSigjmpBuf() Pointer
+
+//go:linkname Sigsetjmp llgo.sigsetjmp
+func Sigsetjmp(jb Pointer, savemask Int) Int
+
+//go:linkname Siglongjmp llgo.siglongjmp
+func Siglongjmp(jb Pointer, retval Int)
+
 //go:linkname Rand C.rand
 func Rand() Int
 
 //go:linkname Malloc C.malloc
 func Malloc(size uintptr) Pointer
 
+//go:linkname Free C.free
+func Free(ptr Pointer)
+
 //go:linkname Memcpy C.memcpy
 func Memcpy(dst, src Pointer, n uintptr) Pointer
 
diff --git a/internal/runtime/z_rt.go b/internal/runtime/z_rt.go
index 4d178efe..063bb25a 100644
--- a/internal/runtime/z_rt.go
+++ b/internal/runtime/z_rt.go
@@ -19,6 +19,7 @@ package runtime
 import (
 	"unsafe"
 
+	"github.com/goplus/llgo/c/pthread"
 	"github.com/goplus/llgo/internal/abi"
 	"github.com/goplus/llgo/internal/runtime/c"
 )
@@ -27,18 +28,43 @@ import (
 
 // Defer presents defer statements in a function.
 type Defer struct {
+	Addr unsafe.Pointer // sigjmpbuf
 	Bits uintptr
 	Link *Defer
-	Rund int // index of RunDefers
+	Rund unsafe.Pointer // block address after RunDefers
+}
+
+// Panic panics with a value.
+func Panic(v Eface) {
+	ptr := c.Malloc(unsafe.Sizeof(v))
+	*(*Eface)(ptr) = v
+	excepKey.Set(ptr)
+
+	Rethrow((*Defer)(c.GoDeferData()))
+}
+
+// Rethrow rethrows a panic.
+func Rethrow(link *Defer) {
+	if link == nil {
+		ptr := excepKey.Get()
+		TracePanic(*(*Eface)(ptr))
+		c.Free(ptr)
+		c.Exit(2)
+	} else {
+		c.Siglongjmp(link.Addr, 1)
+	}
+}
+
+var (
+	excepKey pthread.Key
+)
+
+func init() {
+	excepKey.Create(nil)
 }
 
 // -----------------------------------------------------------------------------
 
-// Zeroinit initializes memory to zero.
-func Zeroinit(p unsafe.Pointer, size uintptr) unsafe.Pointer {
-	return c.Memset(p, 0, size)
-}
-
 // TracePanic prints panic message.
 func TracePanic(v Eface) {
 	kind := v._type.Kind()
@@ -55,3 +81,10 @@ func stringTracef(fp c.FilePtr, format *c.Char, s String) {
 }
 
 // -----------------------------------------------------------------------------
+
+// Zeroinit initializes memory to zero.
+func Zeroinit(p unsafe.Pointer, size uintptr) unsafe.Pointer {
+	return c.Memset(p, 0, size)
+}
+
+// -----------------------------------------------------------------------------
diff --git a/ssa/abitype.go b/ssa/abitype.go
index 1184b385..36c14489 100644
--- a/ssa/abitype.go
+++ b/ssa/abitype.go
@@ -305,7 +305,7 @@ func (p Package) abiTypeInit(g Global, t types.Type, pub bool) {
 	var eq Expr
 	var blks []BasicBlock
 	if pub {
-		eq = b.BinOp(token.EQL, b.Load(expr), b.Prog.Null(expr.Type))
+		eq = b.BinOp(token.EQL, b.Load(expr), b.Prog.Nil(expr.Type))
 		blks = b.Func.MakeBlocks(2)
 		b.If(eq, blks[0], blks[1])
 		b.SetBlockEx(blks[0], AtEnd, false)
@@ -345,7 +345,7 @@ func (b Builder) abiType(t types.Type) Expr {
 	if g == nil {
 		prog := b.Prog
 		g = pkg.doNewVar(name, prog.AbiTypePtrPtr())
-		g.Init(prog.Null(g.Type))
+		g.Init(prog.Nil(g.Type))
 		if pub {
 			g.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 		}
diff --git a/ssa/cl_test.go b/ssa/cl_test.go
index 70f7f455..be5cde02 100644
--- a/ssa/cl_test.go
+++ b/ssa/cl_test.go
@@ -52,6 +52,7 @@ func TestMakeInterface(t *testing.T) {
 	b := fn.MakeBody(1)
 	b.MakeInterface(prog.Any(), prog.IntVal(100, prog.Int64()))
 	b.MakeInterface(prog.Any(), prog.FloatVal(100, prog.Float64()))
+	b.DeferData()
 	b.Return()
 }
 
diff --git a/ssa/eh.go b/ssa/eh.go
index 684274f1..e4ade559 100644
--- a/ssa/eh.go
+++ b/ssa/eh.go
@@ -22,7 +22,6 @@ import "C"
 import (
 	"go/token"
 	"go/types"
-	"log"
 	"unsafe"
 
 	"github.com/goplus/llvm"
@@ -68,8 +67,9 @@ func (b Builder) Sigsetjmp(jb, savemask Expr) Expr {
 }
 
 func (b Builder) Siglongjmp(jb, retval Expr) {
-	fn := b.Pkg.cFunc("siglongjmp", b.Prog.tySiglongjmp())
+	fn := b.Pkg.cFunc("siglongjmp", b.Prog.tySiglongjmp()) // TODO(xsw): mark as noreturn
 	b.Call(fn, jb, retval)
+	// b.Unreachable()
 }
 
 // -----------------------------------------------------------------------------
@@ -78,75 +78,118 @@ const (
 	deferKey = "__llgo_defer"
 )
 
-func (p Function) deferInitBuilder() Builder {
-	b := p.NewBuilder()
-	b.SetBlockEx(p.blks[0], BeforeLast, true)
-	return b
+func (p Function) deferInitBuilder() (b Builder, next BasicBlock) {
+	b = p.NewBuilder()
+	next = b.setBlockMoveLast(p.blks[0])
+	return
 }
 
 type aDefer struct {
-	nextBit  int        // next defer bit
-	key      Expr       // pthread TLS key
-	data     Expr       // pointer to runtime.Defer
-	bitsPtr  Expr       // pointer to defer bits
-	rundPtr  Expr       // pointer to RunDefers index
-	procBlk  BasicBlock // deferProc block
-	stmts    []func(bits Expr)
+	nextBit  int          // next defer bit
+	key      Expr         // pthread TLS key
+	data     Expr         // pointer to runtime.Defer
+	bitsPtr  Expr         // pointer to defer bits
+	rundPtr  Expr         // pointer to RunDefers index
+	procBlk  BasicBlock   // deferProc block
 	runsNext []BasicBlock // next blocks of RunDefers
+	stmts    []func(bits Expr)
 }
 
-func (p Package) deferInit() {
-	keyVar := p.VarOf(deferKey)
+func (p Package) keyInit(name string) {
+	keyVar := p.VarOf(name)
 	if keyVar == nil {
 		return
 	}
 	prog := p.Prog
-	keyNil := prog.Null(prog.DeferPtrPtr())
+	keyNil := prog.Nil(prog.CIntPtr())
 	keyVar.Init(keyNil)
 	keyVar.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 
 	b := p.afterBuilder()
-	eq := b.BinOp(token.EQL, b.Load(keyVar.Expr), keyNil)
+	eq := b.BinOp(token.EQL, b.Load(keyVar.Expr), prog.IntVal(0, prog.CInt()))
 	b.IfThen(eq, func() {
-		b.pthreadKeyCreate(keyVar.Expr, prog.Null(prog.VoidPtr()))
+		b.pthreadKeyCreate(keyVar.Expr, prog.Nil(prog.VoidPtr()))
 	})
 }
 
-func (p Package) newDeferKey() Global {
-	return p.NewVarEx(deferKey, p.Prog.DeferPtrPtr())
+func (p Package) newKey(name string) Global {
+	return p.NewVarEx(name, p.Prog.CIntPtr())
 }
 
 func (b Builder) deferKey() Expr {
-	return b.Load(b.Pkg.newDeferKey().Expr)
+	return b.Load(b.Pkg.newKey(deferKey).Expr)
 }
 
+const (
+	// 0: addr sigjmpbuf
+	// 1: bits uintptr
+	// 2: link *Defer
+	// 3: rund voidptr
+	deferSigjmpbuf = iota
+	deferBits
+	deferLink
+	deferRund
+)
+
 func (b Builder) getDefer(kind DoAction) *aDefer {
 	self := b.Func
 	if self.defer_ == nil {
-		// 0: bits uintptr
-		// 1: link *Defer
-		// 2: rund int
+		// TODO(xsw): check if in pkg.init
+		var next, rundBlk BasicBlock
 		if kind != DeferAlways {
-			b = self.deferInitBuilder()
+			b, next = self.deferInitBuilder()
 		}
 		prog := b.Prog
 		key := b.deferKey()
 		zero := prog.Val(uintptr(0))
-		link := b.pthreadGetspecific(key)
-		ptr := b.aggregateAlloca(prog.Defer(), zero.impl, link.impl)
+		link := Expr{b.pthreadGetspecific(key).impl, prog.DeferPtr()}
+		jb := b.AllocaSigjmpBuf()
+		ptr := b.aggregateAlloca(prog.Defer(), jb.impl, zero.impl, link.impl)
 		deferData := Expr{ptr, prog.DeferPtr()}
 		b.pthreadSetspecific(key, deferData)
+		blks := self.MakeBlocks(2)
+		procBlk, rethrowBlk := blks[0], blks[1]
+		bitsPtr := b.FieldAddr(deferData, deferBits)
+		rundPtr := b.FieldAddr(deferData, deferRund)
 		self.defer_ = &aDefer{
-			key:     key,
-			data:    deferData,
-			bitsPtr: b.FieldAddr(deferData, 0),
-			rundPtr: b.FieldAddr(deferData, 2),
-			procBlk: self.MakeBlock(),
+			key:      key,
+			data:     deferData,
+			bitsPtr:  bitsPtr,
+			rundPtr:  rundPtr,
+			procBlk:  procBlk,
+			runsNext: []BasicBlock{rethrowBlk},
+		}
+		czero := prog.IntVal(0, prog.CInt())
+		retval := b.Sigsetjmp(jb, czero)
+		if kind != DeferAlways {
+			rundBlk = self.MakeBlock()
+		} else {
+			blks = self.MakeBlocks(2)
+			next, rundBlk = blks[0], blks[1]
+		}
+		b.If(b.BinOp(token.EQL, retval, czero), next, rundBlk)
+		b.SetBlockEx(rundBlk, AtEnd, false) // exec runDefers and rethrow
+		b.Store(rundPtr, rethrowBlk.Addr())
+		b.Jump(procBlk)
+
+		b.SetBlockEx(rethrowBlk, AtEnd, false) // rethrow
+		b.Call(b.Pkg.rtFunc("Rethrow"), link)
+		b.Unreachable() // TODO: func supports noreturn attribute
+
+		if kind == DeferAlways {
+			b.SetBlockEx(next, AtEnd, false)
+			b.blk.last = next.last
 		}
 	}
 	return self.defer_
 }
 
+// DeferData returns the defer data (*runtime.Defer).
+func (b Builder) DeferData() Expr {
+	key := b.deferKey()
+	return Expr{b.pthreadGetspecific(key).impl, b.Prog.DeferPtr()}
+}
+
 // Defer emits a defer instruction.
 func (b Builder) Defer(kind DoAction, fn Expr, args ...Expr) {
 	if debugInstr {
@@ -184,14 +227,13 @@ func (b Builder) Defer(kind DoAction, fn Expr, args ...Expr) {
 
 // RunDefers emits instructions to run deferred instructions.
 func (b Builder) RunDefers() {
-	prog := b.Prog
 	self := b.getDefer(DeferInCond)
-	b.Store(self.rundPtr, prog.Val(len(self.runsNext)))
-	b.Jump(self.procBlk)
-
 	blk := b.Func.MakeBlock()
 	self.runsNext = append(self.runsNext, blk)
 
+	b.Store(self.rundPtr, blk.Addr())
+	b.Jump(self.procBlk)
+
 	b.SetBlockEx(blk, AtEnd, false)
 	b.blk.last = blk.last
 }
@@ -202,8 +244,7 @@ func (p Function) endDefer(b Builder) {
 		return
 	}
 	nexts := self.runsNext
-	n := len(nexts)
-	if n == 0 {
+	if len(nexts) == 0 {
 		return
 	}
 	b.SetBlockEx(self.procBlk, AtEnd, true)
@@ -213,19 +254,18 @@ func (p Function) endDefer(b Builder) {
 		stmts[i](bits)
 	}
 
-	link := b.getField(b.Load(self.data), 2)
+	link := b.getField(b.Load(self.data), deferLink)
 	b.pthreadSetspecific(self.key, link)
-
-	prog := b.Prog
-	rund := b.Load(self.rundPtr)
-	sw := b.impl.CreateSwitch(rund.impl, nexts[0].first, n-1)
-	for i := 1; i < n; i++ {
-		sw.AddCase(prog.Val(i).impl, nexts[i].first)
-	}
+	b.IndirectJump(b.Load(self.rundPtr), nexts)
 }
 
 // -----------------------------------------------------------------------------
 
+// Unreachable emits an unreachable instruction.
+func (b Builder) Unreachable() {
+	b.impl.CreateUnreachable()
+}
+
 /*
 // Recover emits a recover instruction.
 func (b Builder) Recover() (v Expr) {
@@ -233,22 +273,14 @@ func (b Builder) Recover() (v Expr) {
 		log.Println("Recover")
 	}
 	prog := b.Prog
-	return prog.Zero(prog.Eface())
+	return prog.Zero(prog.Any())
 }
 */
 
 // Panic emits a panic instruction.
 func (b Builder) Panic(v Expr) {
-	if debugInstr {
-		log.Printf("Panic %v\n", v.impl)
-	}
-	b.Call(b.Pkg.rtFunc("TracePanic"), v)
-	b.impl.CreateUnreachable()
-}
-
-// Unreachable emits an unreachable instruction.
-func (b Builder) Unreachable() {
-	b.impl.CreateUnreachable()
+	b.Call(b.Pkg.rtFunc("Panic"), v)
+	b.Unreachable() // TODO: func supports noreturn attribute
 }
 
 // -----------------------------------------------------------------------------
diff --git a/ssa/expr.go b/ssa/expr.go
index 9b200c70..e72283c0 100644
--- a/ssa/expr.go
+++ b/ssa/expr.go
@@ -83,6 +83,7 @@ func pyVarExpr(mod Expr, name string) Expr {
 
 // -----------------------------------------------------------------------------
 
+// Zero returns a zero constant expression.
 func (p Program) Zero(t Type) Expr {
 	var ret llvm.Value
 	switch u := t.raw.Type.Underlying().(type) {
@@ -127,16 +128,11 @@ func (p Program) Zero(t Type) Expr {
 	return Expr{ret, t}
 }
 
-// Null returns a null constant expression.
-func (p Program) Null(t Type) Expr {
+// Nil returns a null constant expression. t should be a pointer type.
+func (p Program) Nil(t Type) Expr {
 	return Expr{llvm.ConstNull(t.ll), t}
 }
 
-// PyNull returns a null *PyObject constant expression.
-func (p Program) PyNull() Expr {
-	return p.Null(p.PyObjectPtr())
-}
-
 // BoolVal returns a boolean constant expression.
 func (p Program) BoolVal(v bool) Expr {
 	t := p.Bool()
@@ -180,7 +176,7 @@ func (p Program) Val(v interface{}) Expr {
 func (b Builder) Const(v constant.Value, typ Type) Expr {
 	prog := b.Prog
 	if v == nil {
-		return prog.Null(typ)
+		return prog.Nil(typ)
 	}
 	raw := typ.raw.Type
 	switch t := raw.Underlying().(type) {
diff --git a/ssa/goroutine.go b/ssa/goroutine.go
index 389ae8df..d2bf3787 100644
--- a/ssa/goroutine.go
+++ b/ssa/goroutine.go
@@ -86,7 +86,7 @@ func (b Builder) Go(fn Expr, args ...Expr) {
 	data := Expr{b.aggregateMalloc(t, flds...), voidPtr}
 	size := prog.SizeOf(voidPtr)
 	pthd := b.Alloca(prog.IntVal(uint64(size), prog.Uintptr()))
-	b.pthreadCreate(pthd, prog.Null(voidPtr), pkg.routine(t, len(args)), data)
+	b.pthreadCreate(pthd, prog.Nil(voidPtr), pkg.routine(t, len(args)), data)
 }
 
 func (p Package) routineName() string {
@@ -107,7 +107,7 @@ func (p Package) routine(t Type, n int) Expr {
 	}
 	b.Call(fn, args...)
 	b.free(param)
-	b.Return(prog.Null(prog.VoidPtr()))
+	b.Return(prog.Nil(prog.VoidPtr()))
 	return routine.Expr
 }
 
diff --git a/ssa/memory.go b/ssa/memory.go
index 94cfc7f3..d63df457 100644
--- a/ssa/memory.go
+++ b/ssa/memory.go
@@ -107,6 +107,17 @@ func aggregateInit(b llvm.Builder, ptr llvm.Value, tll llvm.Type, flds ...llvm.V
 	}
 }
 
+/*
+func (b Builder) dupMalloc(v Expr) Expr {
+	prog := b.Prog
+	n := prog.SizeOf(v.Type)
+	tptr := prog.Pointer(v.Type)
+	ptr := b.malloc(prog.Val(uintptr(n))).impl
+	b.Store(Expr{ptr, tptr}, v)
+	return Expr{ptr, tptr}
+}
+*/
+
 // -----------------------------------------------------------------------------
 
 // The Alloc instruction reserves space for a variable of the given type,
diff --git a/ssa/package.go b/ssa/package.go
index 24171164..253e8195 100644
--- a/ssa/package.go
+++ b/ssa/package.go
@@ -131,14 +131,16 @@ type aProgram struct {
 	rtSliceTy  llvm.Type
 	rtMapTy    llvm.Type
 
-	anyTy    Type
-	voidTy   Type
-	voidPtr  Type
-	voidPPtr Type
-	boolTy   Type
-	cstrTy   Type
-	cintTy   Type
-	//cintPtr Type
+	anyTy Type
+	//anyPtr  Type
+	//anyPPtr Type
+	voidTy    Type
+	voidPtr   Type
+	voidPPtr  Type
+	boolTy    Type
+	cstrTy    Type
+	cintTy    Type
+	cintPtr   Type
 	stringTy  Type
 	uintptrTy Type
 	intTy     Type
@@ -158,7 +160,6 @@ type aProgram struct {
 	abiTyPPtr Type
 	deferTy   Type
 	deferPtr  Type
-	deferPPtr Type
 
 	pyImpTy      *types.Signature
 	pyNewList    *types.Signature
@@ -328,14 +329,6 @@ func (p Program) DeferPtr() Type {
 	return p.deferPtr
 }
 
-// DeferPtrPtr returns **runtime.Defer type.
-func (p Program) DeferPtrPtr() Type {
-	if p.deferPPtr == nil {
-		p.deferPPtr = p.Pointer(p.DeferPtr())
-	}
-	return p.deferPPtr
-}
-
 // AbiTypePtr returns *abi.Type type.
 func (p Program) AbiTypePtr() Type {
 	if p.abiTyPtr == nil {
@@ -360,6 +353,7 @@ func (p Program) Void() Type {
 	return p.voidTy
 }
 
+// VoidPtr returns *void type.
 func (p Program) VoidPtr() Type {
 	if p.voidPtr == nil {
 		p.voidPtr = p.rawType(types.Typ[types.UnsafePointer])
@@ -367,6 +361,7 @@ func (p Program) VoidPtr() Type {
 	return p.voidPtr
 }
 
+// VoidPtrPtr returns **void type.
 func (p Program) VoidPtrPtr() Type {
 	if p.voidPPtr == nil {
 		p.voidPPtr = p.rawType(types.NewPointer(types.Typ[types.UnsafePointer]))
@@ -382,6 +377,7 @@ func (p Program) Bool() Type {
 	return p.boolTy
 }
 
+// CStr returns *int8 type.
 func (p Program) CStr() Type {
 	if p.cstrTy == nil { // *int8
 		p.cstrTy = p.rawType(types.NewPointer(types.Typ[types.Int8]))
@@ -389,6 +385,7 @@ func (p Program) CStr() Type {
 	return p.cstrTy
 }
 
+// String returns string type.
 func (p Program) String() Type {
 	if p.stringTy == nil {
 		p.stringTy = p.rawType(types.Typ[types.String])
@@ -396,6 +393,24 @@ func (p Program) String() Type {
 	return p.stringTy
 }
 
+/*
+// AnyPtrPtr returns **any type.
+func (p Program) AnyPtrPtr() Type {
+	if p.anyPPtr == nil {
+		p.anyPPtr = p.Pointer(p.AnyPtr())
+	}
+	return p.anyPPtr
+}
+
+// AnyPtr returns *any type.
+func (p Program) AnyPtr() Type {
+	if p.anyPtr == nil {
+		p.anyPtr = p.Pointer(p.Any())
+	}
+	return p.anyPtr
+}
+*/
+
 // Any returns the any (empty interface) type.
 func (p Program) Any() Type {
 	if p.anyTy == nil {
@@ -410,6 +425,7 @@ func (p Program) Any() Type {
 func (p Program) Eface() Type {
 	return p.Any()
 }
+*/
 
 // CIntPtr returns *c.Int type.
 func (p Program) CIntPtr() Type {
@@ -418,7 +434,6 @@ func (p Program) CIntPtr() Type {
 	}
 	return p.cintPtr
 }
-*/
 
 // CInt returns c.Int type.
 func (p Program) CInt() Type {
@@ -550,7 +565,7 @@ func (p Package) cFunc(fullName string, sig *types.Signature) Expr {
 func (p Package) closureStub(b Builder, t *types.Struct, v Expr) Expr {
 	name := v.impl.Name()
 	prog := b.Prog
-	nilVal := prog.Null(prog.VoidPtr()).impl
+	nilVal := prog.Nil(prog.VoidPtr()).impl
 	if fn, ok := p.stubs[name]; ok {
 		v = fn.Expr
 	} else {
@@ -605,7 +620,7 @@ func (p Package) afterBuilder() Builder {
 
 // AfterInit is called after the package is initialized (init all packages that depends on).
 func (p Package) AfterInit(b Builder, ret BasicBlock) {
-	p.deferInit()
+	p.keyInit(deferKey)
 	doAfterb := p.afterb != nil
 	doPyLoadModSyms := p.pyHasModSyms()
 	if doAfterb || doPyLoadModSyms {
diff --git a/ssa/python.go b/ssa/python.go
index 1c8a7bf3..b9520bee 100644
--- a/ssa/python.go
+++ b/ssa/python.go
@@ -200,7 +200,8 @@ func (p Program) tyGetAttrString() *types.Signature {
 func (p Package) PyInit() bool {
 	if fn := p.FuncOf("main"); fn != nil {
 		b := fn.NewBuilder()
-		b.SetBlockEx(fn.Block(0), AtStart, false).callPyInit()
+		b.SetBlockEx(fn.Block(0), AtStart, false)
+		b.callPyInit()
 		b.Dispose()
 		return true
 	}
@@ -216,7 +217,7 @@ func (p Package) PyNewModVar(name string, doInit bool) Global {
 	objPtr := prog.PyObjectPtrPtr().raw.Type
 	g := p.NewVar(name, objPtr, InC)
 	if doInit {
-		g.Init(prog.Null(g.Type))
+		g.Init(prog.Nil(g.Type))
 		g.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 	}
 	p.pymods[name] = g
@@ -245,7 +246,7 @@ func (b Builder) PyLoadModSyms(modName string, objs ...PyObjRef) Expr {
 		args = append(args, o.Expr)
 	}
 	prog := b.Prog
-	args = append(args, prog.Null(prog.CStr()))
+	args = append(args, prog.Nil(prog.CStr()))
 	return b.Call(fnLoad, args...)
 }
 
@@ -272,7 +273,7 @@ func (b Builder) pyCall(fn Expr, args []Expr) (ret Expr) {
 		callargs := make([]Expr, n+2)
 		callargs[0] = fn
 		copy(callargs[1:], args)
-		callargs[n+1] = prog.PyNull()
+		callargs[n+1] = prog.Nil(prog.PyObjectPtr())
 		ret = b.Call(call, callargs...)
 	}
 	return
@@ -371,7 +372,7 @@ func (p Package) PyNewFunc(name string, sig *types.Signature, doInit bool) PyObj
 	obj := p.NewVar(name, prog.PyObjectPtrPtr().RawType(), InC)
 	if doInit {
 		prog.NeedPyInit = true
-		obj.Init(prog.Null(obj.Type))
+		obj.Init(prog.Nil(obj.Type))
 		obj.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
 	}
 	ty := &aType{obj.ll, rawType{types.NewPointer(sig)}, vkPyFuncRef}
diff --git a/ssa/stmt_builder.go b/ssa/stmt_builder.go
index 40b58041..ca20e88d 100644
--- a/ssa/stmt_builder.go
+++ b/ssa/stmt_builder.go
@@ -48,6 +48,12 @@ func (p BasicBlock) Index() int {
 	return p.idx
 }
 
+// Addr returns the address of the basic block.
+func (p BasicBlock) Addr() Expr {
+	fn := p.fn
+	return Expr{llvm.BlockAddress(fn.impl, p.first), fn.Prog.VoidPtr()}
+}
+
 // -----------------------------------------------------------------------------
 
 type aBuilder struct {
@@ -80,6 +86,21 @@ func (b Builder) SetBlock(blk BasicBlock) Builder {
 	return b
 }
 
+func (b Builder) setBlockMoveLast(blk BasicBlock) (next BasicBlock) {
+	blkLast := blk.last
+	last := blkLast.LastInstruction()
+	last.RemoveFromParentAsInstruction()
+
+	impl := b.impl
+
+	next = b.Func.MakeBlock()
+	impl.SetInsertPointAtEnd(next.last)
+	impl.Insert(last)
+
+	impl.SetInsertPointAtEnd(blkLast)
+	return
+}
+
 type InsertPoint int
 
 const (
@@ -90,7 +111,7 @@ const (
 )
 
 // SetBlockEx sets blk as current basic block and pos as its insert point.
-func (b Builder) SetBlockEx(blk BasicBlock, pos InsertPoint, setBlk bool) Builder {
+func (b Builder) SetBlockEx(blk BasicBlock, pos InsertPoint, setBlk bool) {
 	if b.Func != blk.fn {
 		panic("mismatched function")
 	}
@@ -109,7 +130,6 @@ func (b Builder) SetBlockEx(blk BasicBlock, pos InsertPoint, setBlk bool) Builde
 	if setBlk {
 		b.blk = blk
 	}
-	return b
 }
 
 func instrAfterInit(blk llvm.BasicBlock) llvm.Value {
@@ -188,6 +208,17 @@ func (b Builder) Jump(jmpb BasicBlock) {
 	b.impl.CreateBr(jmpb.first)
 }
 
+// IndirectJump emits an indirect jump instruction.
+func (b Builder) IndirectJump(addr Expr, dests []BasicBlock) {
+	if debugInstr {
+		log.Printf("IndirectJump %v\n", addr.impl)
+	}
+	ibr := b.impl.CreateIndirectBr(addr.impl, len(dests))
+	for _, dest := range dests {
+		ibr.AddDest(dest.first)
+	}
+}
+
 // If emits an if instruction.
 func (b Builder) If(cond Expr, thenb, elseb BasicBlock) {
 	if b.Func != thenb.fn || b.Func != elseb.fn {
@@ -210,6 +241,46 @@ func (b Builder) IfThen(cond Expr, then func()) {
 	b.blk.last = blks[1].last
 }
 
+// -----------------------------------------------------------------------------
+/*
+type caseStmt struct {
+	v   llvm.Value
+	blk llvm.BasicBlock
+}
+
+type aSwitch struct {
+	v     llvm.Value
+	def   llvm.BasicBlock
+	cases []caseStmt
+}
+
+// Switch represents a switch statement.
+type Switch = *aSwitch
+
+// Case emits a case instruction.
+func (p Switch) Case(v Expr, blk BasicBlock) {
+	if debugInstr {
+		log.Printf("Case %v, _llgo_%v\n", v.impl, blk.idx)
+	}
+	p.cases = append(p.cases, caseStmt{v.impl, blk.first})
+}
+
+// End ends a switch statement.
+func (p Switch) End(b Builder) {
+	sw := b.impl.CreateSwitch(p.v, p.def, len(p.cases))
+	for _, c := range p.cases {
+		sw.AddCase(c.v, c.blk)
+	}
+}
+
+// Switch starts a switch statement.
+func (b Builder) Switch(v Expr, defb BasicBlock) Switch {
+	if debugInstr {
+		log.Printf("Switch %v, _llgo_%v\n", v.impl, defb.idx)
+	}
+	return &aSwitch{v.impl, defb.first, nil}
+}
+*/
 // -----------------------------------------------------------------------------
 
 // Phi represents a phi node.