build: remove incorrect TODO comment

Remove TODO(lijie) comment as requested - the syscall.init weak stub is intentional.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: cpunion <8459+cpunion@users.noreply.github.com>

.github/actions/setup-deps/action.yml

@@ -16,6 +16,8 @@ runs:
     - name: Install macOS dependencies
       if: runner.os == 'macOS'
       shell: bash
+      env:
+        HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: 1
       run: |
         brew update
         

.github/workflows/llgo.yml

@@ -27,7 +27,7 @@ jobs:
           wget -P ./_demo/c/llama2-c https://huggingface.co/karpathy/tinyllamas/resolve/main/stories15M.bin
 
       - name: Upload model as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llama2-model
           path: ./_demo/c/llama2-c/stories15M.bin
@@ -52,7 +52,7 @@ jobs:
         with:
           llvm-version: ${{matrix.llvm}}
       - name: Download model artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: llama2-model
           path: ./_demo/c/llama2-c/

.github/workflows/release-build.yml

@@ -82,7 +82,7 @@ jobs:
             release --verbose --skip=publish,nfpm,snapcraft --snapshot --clean
 
       - name: Upload Darwin AMD64 Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llgo-darwin-amd64
           path: .dist/*darwin-amd64.tar.gz
@@ -90,7 +90,7 @@ jobs:
           include-hidden-files: true
 
       - name: Upload Darwin ARM64 Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llgo-darwin-arm64
           path: .dist/*darwin-arm64.tar.gz
@@ -98,7 +98,7 @@ jobs:
           include-hidden-files: true
 
       - name: Upload Linux AMD64 Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llgo-linux-amd64
           path: .dist/*linux-amd64.tar.gz
@@ -106,7 +106,7 @@ jobs:
           include-hidden-files: true
 
       - name: Upload Linux ARM64 Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llgo-linux-arm64
           path: .dist/*linux-arm64.tar.gz
@@ -114,7 +114,7 @@ jobs:
           include-hidden-files: true
 
       - name: Upload Checksums
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: llgo-checksums
           path: .dist/*checksums.txt
@@ -158,7 +158,7 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
       - name: Download Platform Artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: llgo-${{ matrix.goos }}-${{ matrix.goarch }}
           path: .

CLAUDE.md

@@ -51,6 +51,56 @@ go test ./...
 
 **Important:** The `LLGO_ROOT` environment variable must be set to the repository root when running llgo commands during development.
 
+### Update out.ll files after modifying compiler IR generation
+
+**CRITICAL:** When you modify the compiler's IR generation logic (especially in `ssa/` or `cl/` packages), you MUST update all out.ll test files under the `cl/` directory.
+
+#### Understanding out.ll files
+
+The `out.ll` files under the `cl/` directory are comparison IR files that serve as reference outputs for the test suite:
+- They are generated by `llgen` from the corresponding `in.go` files in the same directory
+- They reflect the current compiler's LLVM IR representation of the Go source code
+- They are used by tests to verify that the compiler generates correct and consistent IR output
+
+#### Required steps after modifying IR generation logic
+
+1. **Reinstall the tools** to apply your compiler changes:
+   ```bash
+   go install -v ./chore/gentests
+   go install -v ./chore/llgen
+   ```
+
+2. **Regenerate out.ll files**:
+   
+   **For batch updates (recommended)** - Use `gentests` to regenerate all test files:
+   ```bash
+   gentests
+   ```
+   This will automatically regenerate all out.ll files in these directories:
+   - `cl/_testlibc`
+   - `cl/_testlibgo`
+   - `cl/_testrt`
+   - `cl/_testgo`
+   - `cl/_testpy`
+   - `cl/_testdata`
+   
+   **For individual test inspection** - Use `llgen` to regenerate specific test directories:
+   ```bash
+   llgen cl/_testgo/interface
+   llgen cl/_testrt/tpmethod
+   ```
+
+3. **Verify the changes** make sense by reviewing the diff in the out.ll files
+
+4. **Commit the updated out.ll files** along with your compiler changes
+
+#### Why this matters
+
+This process ensures that:
+- The test suite reflects the current compiler behavior
+- Changes to IR generation are properly documented and reviewed
+- Future regressions can be detected by comparing against the reference output
+
 ## Code Quality
 
 Before submitting any code updates, you must run the following formatting and validation commands:

README.md

@@ -261,7 +261,7 @@ All Go syntax (including `cgo`) is already supported. Here are some examples:
 
 ### Defer
 
-LLGo `defer` does not support usage in loops. This is not a bug but a feature, because we think that using `defer` in a loop is a very unrecommended practice.
+LLGo now supports `defer` within loops, matching Go's semantics of executing defers in LIFO order for every iteration. The usual caveat from Go still applies: be mindful of loop-heavy defer usage because it allocates per iteration.
 
 
 ### Garbage Collection (GC)

_demo/c/stacksave/stacksave_amd64.go

@@ -0,0 +1,22 @@
+//go:build amd64
+
+package main
+
+import (
+	"unsafe"
+	_ "unsafe"
+)
+
+//go:linkname getsp llgo.stackSave
+func getsp() unsafe.Pointer
+
+//go:linkname asmFull llgo.asm
+func asmFull(instruction string, regs map[string]any) uintptr { return 0 }
+
+func main() {
+	sp := asmFull("movq %rsp, {}", nil)
+
+	if sp != uintptr(getsp()) {
+		panic("invalid stack pointer")
+	}
+}

_demo/c/stacksave/stacksave_arm64.go

@@ -0,0 +1,22 @@
+//go:build arm64
+
+package main
+
+import (
+	"unsafe"
+	_ "unsafe"
+)
+
+//go:linkname getsp llgo.stackSave
+func getsp() unsafe.Pointer
+
+//go:linkname asmFull llgo.asm
+func asmFull(instruction string, regs map[string]any) uintptr { return 0 }
+
+func main() {
+	sp := asmFull("mov {}, sp", nil)
+
+	if sp != uintptr(getsp()) {
+		panic("invalid stack pointer")
+	}
+}

_demo/go/export/libexport.h.want

@@ -297,6 +297,12 @@ github_com_goplus_llgo_runtime_internal_clite_pthread_init(void) GO_SYMBOL_RENAM
 void
 github_com_goplus_llgo_runtime_internal_clite_pthread_sync_init(void) GO_SYMBOL_RENAME("github.com/goplus/llgo/runtime/internal/clite/pthread/sync.init")
 
+void
+github_com_goplus_llgo_runtime_internal_clite_signal_init(void) GO_SYMBOL_RENAME("github.com/goplus/llgo/runtime/internal/clite/signal.init")
+
+void
+github_com_goplus_llgo_runtime_internal_clite_tls_init(void) GO_SYMBOL_RENAME("github.com/goplus/llgo/runtime/internal/clite/tls.init")
+
 void
 github_com_goplus_llgo_runtime_internal_runtime_goarch_init(void) GO_SYMBOL_RENAME("github.com/goplus/llgo/runtime/internal/runtime/goarch.init")
 

_demo/go/gobuild/demo.go

@@ -0,0 +1,147 @@
+package main
+
+import (
+	"fmt"
+	"go/build"
+	"runtime"
+	"strings"
+)
+
+func main() {
+	fmt.Printf("runtime.Compiler = %q\n", runtime.Compiler)
+
+	// Test 1: Check build.Default context
+	ctx := build.Default
+	fmt.Printf("build.Default.Compiler = %q\n", ctx.Compiler)
+	if ctx.Compiler != "gc" {
+		panic(fmt.Sprintf("expected build.Default.Compiler to be \"gc\", got %q", ctx.Compiler))
+	}
+
+	if len(ctx.ToolTags) == 0 {
+		panic("expected build.Default.ToolTags to be non-empty")
+	}
+	fmt.Printf("build.Default.ToolTags = %v\n", ctx.ToolTags)
+
+	if len(ctx.ReleaseTags) == 0 {
+		panic("expected build.Default.ReleaseTags to be non-empty")
+	}
+	fmt.Printf("build.Default.ReleaseTags count = %d\n", len(ctx.ReleaseTags))
+
+	// Validate GOOS and GOARCH are set
+	if ctx.GOOS == "" {
+		panic("expected build.Default.GOOS to be non-empty")
+	}
+	if ctx.GOARCH == "" {
+		panic("expected build.Default.GOARCH to be non-empty")
+	}
+	fmt.Printf("build.Default.GOOS = %q, GOARCH = %q\n", ctx.GOOS, ctx.GOARCH)
+
+	// Test 2: Import standard library package with FindOnly
+	pkg, err := build.Import("fmt", "", build.FindOnly)
+	if err != nil {
+		panic(fmt.Sprintf("build.Import(\"fmt\") failed: %v", err))
+	}
+	if pkg.ImportPath != "fmt" {
+		panic(fmt.Sprintf("expected ImportPath \"fmt\", got %q", pkg.ImportPath))
+	}
+	if !pkg.Goroot {
+		panic("expected fmt package to be in GOROOT")
+	}
+	fmt.Printf("build.Import(\"fmt\"): ImportPath=%s, Goroot=%v\n", pkg.ImportPath, pkg.Goroot)
+
+	// Test 3: Import nested standard library package
+	osPkg, err := build.Import("os/exec", "", build.FindOnly)
+	if err != nil {
+		panic(fmt.Sprintf("build.Import(\"os/exec\") failed: %v", err))
+	}
+	if osPkg.ImportPath != "os/exec" {
+		panic(fmt.Sprintf("expected ImportPath \"os/exec\", got %q", osPkg.ImportPath))
+	}
+	if !osPkg.Goroot {
+		panic("expected os/exec package to be in GOROOT")
+	}
+	fmt.Printf("build.Import(\"os/exec\"): ImportPath=%s, Goroot=%v\n", osPkg.ImportPath, osPkg.Goroot)
+
+	// Test 4: Import internal package (should succeed with FindOnly)
+	internalPkg, err := build.Import("internal/cpu", "", build.FindOnly)
+	if err != nil {
+		panic(fmt.Sprintf("build.Import(\"internal/cpu\") failed: %v", err))
+	}
+	if internalPkg.ImportPath != "internal/cpu" {
+		panic(fmt.Sprintf("expected ImportPath \"internal/cpu\", got %q", internalPkg.ImportPath))
+	}
+	fmt.Printf("build.Import(\"internal/cpu\"): ImportPath=%s\n", internalPkg.ImportPath)
+
+	// Test 5: Import with srcDir parameter
+	runtimePkg, err := build.Import("runtime", "", build.FindOnly)
+	if err != nil {
+		panic(fmt.Sprintf("build.Import(\"runtime\") failed: %v", err))
+	}
+	if runtimePkg.ImportPath != "runtime" {
+		panic(fmt.Sprintf("expected ImportPath \"runtime\", got %q", runtimePkg.ImportPath))
+	}
+	if runtimePkg.Dir == "" {
+		panic("expected runtime package Dir to be non-empty")
+	}
+	fmt.Printf("build.Import(\"runtime\"): ImportPath=%s, Dir exists=%v\n", runtimePkg.ImportPath, runtimePkg.Dir != "")
+
+	// Test 6: ImportDir with current directory
+	dirPkg, err := build.ImportDir(".", build.FindOnly)
+	if err != nil {
+		panic(fmt.Sprintf("build.ImportDir(\".\") failed: %v", err))
+	}
+	// Note: Name might be empty with FindOnly mode as it doesn't read source files
+	fmt.Printf("build.ImportDir(\".\"): Dir=%s, ImportPath=%s\n", dirPkg.Dir, dirPkg.ImportPath)
+
+	// Test 7: IsLocalImport with various paths
+	testCases := []struct {
+		path     string
+		expected bool
+	}{
+		{"./foo", true},
+		{"../bar", true},
+		{"./", true},
+		{"fmt", false},
+		{"github.com/user/repo", false},
+		{"", false},
+	}
+	for _, tc := range testCases {
+		result := build.IsLocalImport(tc.path)
+		if result != tc.expected {
+			panic(fmt.Sprintf("build.IsLocalImport(%q): expected %v, got %v", tc.path, tc.expected, result))
+		}
+	}
+	fmt.Printf("build.IsLocalImport: all test cases passed\n")
+
+	// Test 8: Verify Context has expected fields
+	if ctx.GOPATH == "" && ctx.GOROOT == "" {
+		panic("expected either GOPATH or GOROOT to be set")
+	}
+	fmt.Printf("build.Default.GOROOT exists = %v\n", ctx.GOROOT != "")
+
+	// Test 9: Import with AllowBinary flag
+	binaryPkg, err := build.Import("fmt", "", build.FindOnly|build.AllowBinary)
+	if err != nil {
+		panic(fmt.Sprintf("build.Import with AllowBinary failed: %v", err))
+	}
+	if binaryPkg.ImportPath != "fmt" {
+		panic(fmt.Sprintf("expected ImportPath \"fmt\", got %q", binaryPkg.ImportPath))
+	}
+	fmt.Printf("build.Import(\"fmt\") with AllowBinary: success\n")
+
+	// Test 10: Verify compiler tag in build context
+	hasCompilerTag := false
+	for _, tag := range ctx.ReleaseTags {
+		if strings.HasPrefix(tag, "go1.") {
+			hasCompilerTag = true
+			break
+		}
+	}
+	if !hasCompilerTag {
+		panic("expected at least one go1.x release tag")
+	}
+	fmt.Printf("build.Default.ReleaseTags: contains go1.x tags = %v\n", hasCompilerTag)
+
+	fmt.Printf("\nSuccess! All go/build public functions work correctly with llgo\n")
+	fmt.Printf("Total tests passed: 10\n")
+}

_demo/go/gotoken/main.go

@@ -0,0 +1,356 @@
+package main
+
+import (
+	"fmt"
+	"go/token"
+)
+
+func main() {
+	testPos()
+	testToken()
+	testFileSet()
+	testFile()
+	testPosition()
+	testTokenPrecedence()
+	testTokenKeywords()
+	testUtilityFunctions()
+}
+
+func testPos() {
+	fmt.Println("=== Test Pos ===")
+	
+	pos1 := token.Pos(100)
+	pos2 := token.Pos(200)
+	
+	if pos1 != 100 {
+		panic(fmt.Sprintf("Expected pos1 to be 100, got %d", pos1))
+	}
+	if pos2 != 200 {
+		panic(fmt.Sprintf("Expected pos2 to be 200, got %d", pos2))
+	}
+	fmt.Printf("Pos1: %d, Pos2: %d\n", pos1, pos2)
+	
+	if !pos1.IsValid() {
+		panic("Expected pos1.IsValid() to be true")
+	}
+	fmt.Printf("Pos1.IsValid(): %v\n", pos1.IsValid())
+	
+	noPos := token.NoPos
+	if noPos != 0 {
+		panic(fmt.Sprintf("Expected NoPos to be 0, got %d", noPos))
+	}
+	if noPos.IsValid() {
+		panic("Expected NoPos.IsValid() to be false")
+	}
+	fmt.Printf("NoPos: %d, IsValid: %v\n", noPos, noPos.IsValid())
+	
+	fmt.Println("SUCCESS: Pos operations work correctly\n")
+}
+
+func testToken() {
+	fmt.Println("\n=== Test Token Types ===")
+	
+	expectedStrings := map[token.Token]string{
+		token.ADD:    "+",
+		token.SUB:    "-",
+		token.MUL:    "*",
+		token.QUO:    "/",
+		token.LPAREN: "(",
+		token.RPAREN: ")",
+		token.EQL:    "==",
+		token.NEQ:    "!=",
+	}
+	
+	for tok, expected := range expectedStrings {
+		if tok.String() != expected {
+			panic(fmt.Sprintf("Expected %v.String() to be %q, got %q", tok, expected, tok.String()))
+		}
+	}
+	
+	tokens := []token.Token{
+		token.ILLEGAL,
+		token.EOF,
+		token.COMMENT,
+		token.IDENT,
+		token.INT,
+		token.FLOAT,
+		token.IMAG,
+		token.CHAR,
+		token.STRING,
+		token.ADD,
+		token.SUB,
+		token.MUL,
+		token.QUO,
+		token.REM,
+		token.AND,
+		token.OR,
+		token.XOR,
+		token.SHL,
+		token.SHR,
+		token.AND_NOT,
+		token.ADD_ASSIGN,
+		token.SUB_ASSIGN,
+		token.MUL_ASSIGN,
+		token.QUO_ASSIGN,
+		token.REM_ASSIGN,
+		token.AND_ASSIGN,
+		token.OR_ASSIGN,
+		token.XOR_ASSIGN,
+		token.SHL_ASSIGN,
+		token.SHR_ASSIGN,
+		token.AND_NOT_ASSIGN,
+		token.LAND,
+		token.LOR,
+		token.ARROW,
+		token.INC,
+		token.DEC,
+		token.EQL,
+		token.LSS,
+		token.GTR,
+		token.ASSIGN,
+		token.NOT,
+		token.NEQ,
+		token.LEQ,
+		token.GEQ,
+		token.DEFINE,
+		token.ELLIPSIS,
+		token.LPAREN,
+		token.LBRACK,
+		token.LBRACE,
+		token.COMMA,
+		token.PERIOD,
+		token.RPAREN,
+		token.RBRACK,
+		token.RBRACE,
+		token.SEMICOLON,
+		token.COLON,
+	}
+	
+	for _, tok := range tokens {
+		fmt.Printf("Token: %s (String: %q)\n", tok, tok.String())
+	}
+	
+	fmt.Println("SUCCESS: Token types work correctly\n")
+}
+
+func testTokenKeywords() {
+	fmt.Println("\n=== Test Keywords ===")
+	
+	keywords := []token.Token{
+		token.BREAK,
+		token.CASE,
+		token.CHAN,
+		token.CONST,
+		token.CONTINUE,
+		token.DEFAULT,
+		token.DEFER,
+		token.ELSE,
+		token.FALLTHROUGH,
+		token.FOR,
+		token.FUNC,
+		token.GO,
+		token.GOTO,
+		token.IF,
+		token.IMPORT,
+		token.INTERFACE,
+		token.MAP,
+		token.PACKAGE,
+		token.RANGE,
+		token.RETURN,
+		token.SELECT,
+		token.STRUCT,
+		token.SWITCH,
+		token.TYPE,
+		token.VAR,
+	}
+	
+	for _, kw := range keywords {
+		if !kw.IsKeyword() {
+			panic(fmt.Sprintf("Expected %s to be a keyword", kw))
+		}
+		fmt.Printf("Keyword: %s, IsKeyword: %v\n", kw, kw.IsKeyword())
+	}
+	
+	if token.ADD.IsKeyword() {
+		panic("Expected ADD operator to not be a keyword")
+	}
+	if token.IDENT.IsKeyword() {
+		panic("Expected IDENT token to not be a keyword")
+	}
+	
+	fmt.Println("SUCCESS: Keyword checks work correctly\n")
+}
+
+func testTokenPrecedence() {
+	fmt.Println("\n=== Test Token Precedence ===")
+	
+	if token.MUL.Precedence() <= token.ADD.Precedence() {
+		panic("Expected MUL to have higher precedence than ADD")
+	}
+	if token.LAND.Precedence() <= token.LOR.Precedence() {
+		panic("Expected LAND to have higher precedence than LOR")
+	}
+	if token.MUL.Precedence() != token.QUO.Precedence() {
+		panic("Expected MUL and QUO to have same precedence")
+	}
+	if token.ADD.Precedence() != token.SUB.Precedence() {
+		panic("Expected ADD and SUB to have same precedence")
+	}
+	
+	operators := []token.Token{
+		token.ADD,
+		token.SUB,
+		token.MUL,
+		token.QUO,
+		token.REM,
+		token.LAND,
+		token.LOR,
+		token.EQL,
+		token.LSS,
+		token.GTR,
+	}
+	
+	for _, op := range operators {
+		fmt.Printf("Operator: %s, Precedence: %d\n", op, op.Precedence())
+	}
+	
+	fmt.Println("SUCCESS: Precedence operations work correctly\n")
+}
+
+func testFileSet() {
+	fmt.Println("\n=== Test FileSet ===")
+	
+	fset := token.NewFileSet()
+	
+	file1 := fset.AddFile("file1.go", -1, 1000)
+	file2 := fset.AddFile("file2.go", -1, 2000)
+	
+	fmt.Printf("Added file1: %s, Base: %d, Size: %d\n", file1.Name(), file1.Base(), file1.Size())
+	fmt.Printf("Added file2: %s, Base: %d, Size: %d\n", file2.Name(), file2.Base(), file2.Size())
+	
+	pos := file1.Pos(100)
+	retrievedFile := fset.File(pos)
+	if retrievedFile != file1 {
+		panic("FileSet.File failed to retrieve correct file")
+	}
+	
+	position := fset.Position(pos)
+	fmt.Printf("Position at offset 100: %s\n", position)
+	
+	fmt.Println("SUCCESS: FileSet operations work correctly\n")
+}
+
+func testFile() {
+	fmt.Println("\n=== Test File ===")
+	
+	fset := token.NewFileSet()
+	file := fset.AddFile("test.go", -1, 1000)
+	
+	if file.Name() != "test.go" {
+		panic(fmt.Sprintf("Expected file name to be 'test.go', got %q", file.Name()))
+	}
+	if file.Size() != 1000 {
+		panic(fmt.Sprintf("Expected file size to be 1000, got %d", file.Size()))
+	}
+	
+	file.AddLine(0)
+	file.AddLine(50)
+	file.AddLine(100)
+	
+	if file.LineCount() != 3 {
+		panic(fmt.Sprintf("Expected line count to be 3, got %d", file.LineCount()))
+	}
+	
+	fmt.Printf("File name: %s\n", file.Name())
+	fmt.Printf("File base: %d\n", file.Base())
+	fmt.Printf("File size: %d\n", file.Size())
+	fmt.Printf("File line count: %d\n", file.LineCount())
+	
+	pos := file.Pos(50)
+	fmt.Printf("Pos at offset 50: %d\n", pos)
+	
+	offset := file.Offset(pos)
+	if offset != 50 {
+		panic(fmt.Sprintf("Expected offset to be 50, got %d", offset))
+	}
+	fmt.Printf("Offset of pos: %d\n", offset)
+	
+	line := file.Line(pos)
+	if line != 2 {
+		panic(fmt.Sprintf("Expected line to be 2, got %d", line))
+	}
+	fmt.Printf("Line number at pos: %d\n", line)
+	
+	lineStart := file.LineStart(2)
+	fmt.Printf("Line 2 starts at pos: %d\n", lineStart)
+	
+	position := file.Position(pos)
+	fmt.Printf("Position: %s\n", position)
+	
+	fmt.Println("SUCCESS: File operations work correctly\n")
+}
+
+func testPosition() {
+	fmt.Println("\n=== Test Position ===" )
+	
+	pos := token.Position{
+		Filename: "test.go",
+		Offset:   100,
+		Line:     5,
+		Column:   10,
+	}
+	
+	if !pos.IsValid() {
+		panic("Expected valid position to be valid")
+	}
+	if pos.Filename != "test.go" {
+		panic(fmt.Sprintf("Expected filename to be 'test.go', got %q", pos.Filename))
+	}
+	if pos.Line != 5 {
+		panic(fmt.Sprintf("Expected line to be 5, got %d", pos.Line))
+	}
+	if pos.Column != 10 {
+		panic(fmt.Sprintf("Expected column to be 10, got %d", pos.Column))
+	}
+	
+	fmt.Printf("Position: %s\n", pos.String())
+	fmt.Printf("Filename: %s, Line: %d, Column: %d, Offset: %d\n", 
+		pos.Filename, pos.Line, pos.Column, pos.Offset)
+	fmt.Printf("IsValid: %v\n", pos.IsValid())
+	
+	invalidPos := token.Position{}
+	if invalidPos.IsValid() {
+		panic("Expected empty position to be invalid")
+	}
+	fmt.Printf("Invalid position IsValid: %v\n", invalidPos.IsValid())
+	
+	fmt.Println("SUCCESS: Position operations work correctly\n")
+}
+
+func testUtilityFunctions() {
+	fmt.Println("\n=== Test Utility Functions ===")
+
+	fmt.Printf("IsExported(\"Foo\"): %v\n", token.IsExported("Foo"))
+	fmt.Printf("IsExported(\"foo\"): %v\n", token.IsExported("foo"))
+	fmt.Printf("IsExported(\"_foo\"): %v\n", token.IsExported("_foo"))
+
+	fmt.Printf("IsIdentifier(\"foo\"): %v\n", token.IsIdentifier("foo"))
+	fmt.Printf("IsIdentifier(\"foo123\"): %v\n", token.IsIdentifier("foo123"))
+	fmt.Printf("IsIdentifier(\"123foo\"): %v\n", token.IsIdentifier("123foo"))
+	fmt.Printf("IsIdentifier(\"foo-bar\"): %v\n", token.IsIdentifier("foo-bar"))
+
+	fmt.Printf("IsKeyword(\"func\"): %v\n", token.IsKeyword("func"))
+	fmt.Printf("IsKeyword(\"if\"): %v\n", token.IsKeyword("if"))
+	fmt.Printf("IsKeyword(\"foo\"): %v\n", token.IsKeyword("foo"))
+
+	lookupFunc := token.Lookup("func")
+	fmt.Printf("Lookup(\"func\"): %s\n", lookupFunc)
+
+	lookupIdent := token.Lookup("myVar")
+	fmt.Printf("Lookup(\"myVar\"): %s\n", lookupIdent)
+
+	lookupFor := token.Lookup("for")
+	fmt.Printf("Lookup(\"for\"): %s\n", lookupFor)
+
+	fmt.Println("SUCCESS: Utility functions work correctly\n")
+}

_demo/go/gotypes/main.go

@@ -0,0 +1,488 @@
+package main
+
+import (
+	"fmt"
+	"go/token"
+	"go/types"
+)
+
+func main() {
+	testBasicTypes()
+	testObjects()
+	testScope()
+	testPackage()
+	testNamed()
+	testInterface()
+	testStruct()
+	testSignature()
+	testTuple()
+	testArray()
+	testSlice()
+	testPointer()
+	testMap()
+	testChan()
+	testTypeComparison()
+	testTypeChecking()
+	testStringFunctions()
+	testLookupFunctions()
+	testUtilityFunctions()
+}
+
+func testBasicTypes() {
+	fmt.Println("=== Test Basic Types ===")
+
+	intType := types.Typ[types.Int]
+	fmt.Printf("Int type: %v, Kind: %v\n", intType, intType.Kind())
+	if intType.Kind() != types.Int {
+		panic(fmt.Sprintf("Int type kind mismatch: expected %v, got %v", types.Int, intType.Kind()))
+	}
+
+	stringType := types.Typ[types.String]
+	fmt.Printf("String type: %v, Kind: %v\n", stringType, stringType.Kind())
+	if stringType.Kind() != types.String {
+		panic(fmt.Sprintf("String type kind mismatch: expected %v, got %v", types.String, stringType.Kind()))
+	}
+
+	boolType := types.Typ[types.Bool]
+	fmt.Printf("Bool type: %v, Kind: %v\n", boolType, boolType.Kind())
+	if boolType.Kind() != types.Bool {
+		panic(fmt.Sprintf("Bool type kind mismatch: expected %v, got %v", types.Bool, boolType.Kind()))
+	}
+
+	float64Type := types.Typ[types.Float64]
+	fmt.Printf("Float64 type: %v, Kind: %v\n", float64Type, float64Type.Kind())
+	if float64Type.Kind() != types.Float64 {
+		panic(fmt.Sprintf("Float64 type kind mismatch: expected %v, got %v", types.Float64, float64Type.Kind()))
+	}
+
+	fmt.Println("SUCCESS: Basic types work correctly\n")
+}
+
+func testObjects() {
+	fmt.Println("\n=== Test Objects (Var, Const, Func, TypeName) ===")
+
+	varObj := types.NewVar(token.NoPos, nil, "x", types.Typ[types.Int])
+	fmt.Printf("Var: Name=%s, Type=%v\n", varObj.Name(), varObj.Type())
+	if varObj.Name() != "x" {
+		panic(fmt.Sprintf("Var name mismatch: expected x, got %s", varObj.Name()))
+	}
+	if varObj.Type() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Var type mismatch: expected int, got %v", varObj.Type()))
+	}
+
+	constObj := types.NewConst(token.NoPos, nil, "pi", types.Typ[types.Float64], nil)
+	fmt.Printf("Const: Name=%s, Type=%v\n", constObj.Name(), constObj.Type())
+	if constObj.Name() != "pi" {
+		panic(fmt.Sprintf("Const name mismatch: expected pi, got %s", constObj.Name()))
+	}
+	if constObj.Type() != types.Typ[types.Float64] {
+		panic(fmt.Sprintf("Const type mismatch: expected float64, got %v", constObj.Type()))
+	}
+
+	sig := types.NewSignatureType(nil, nil, nil, nil, nil, false)
+	funcObj := types.NewFunc(token.NoPos, nil, "foo", sig)
+	fmt.Printf("Func: Name=%s, Type=%v\n", funcObj.Name(), funcObj.Type())
+	if funcObj.Name() != "foo" {
+		panic(fmt.Sprintf("Func name mismatch: expected foo, got %s", funcObj.Name()))
+	}
+
+	typeObj := types.NewTypeName(token.NoPos, nil, "MyInt", types.Typ[types.Int])
+	fmt.Printf("TypeName: Name=%s, Type=%v\n", typeObj.Name(), typeObj.Type())
+	if typeObj.Name() != "MyInt" {
+		panic(fmt.Sprintf("TypeName name mismatch: expected MyInt, got %s", typeObj.Name()))
+	}
+
+	var obj types.Object = varObj
+	if obj.Name() != "x" {
+		panic("Object interface conversion failed")
+	}
+	fmt.Println("SUCCESS: Object interface works correctly\n")
+}
+
+func testScope() {
+	fmt.Println("\n=== Test Scope ===")
+
+	scope := types.NewScope(nil, 0, 0, "test")
+	obj := types.NewVar(0, nil, "x", types.Typ[types.Int])
+
+	scope.Insert(obj)
+	result := scope.Lookup("x")
+	if result != obj {
+		panic("Scope.Lookup failed")
+	}
+
+	names := scope.Names()
+	if len(names) != 1 || names[0] != "x" {
+		panic("Scope.Names failed")
+	}
+
+	num := scope.Len()
+	if num != 1 {
+		panic("Scope.Len failed")
+	}
+
+	fmt.Printf("Scope contains %d object(s): %v\n", num, names)
+	fmt.Println("SUCCESS: Scope operations work correctly\n")
+}
+
+func testPackage() {
+	fmt.Println("\n=== Test Package ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+	fmt.Printf("Package: Path=%s, Name=%s\n", pkg.Path(), pkg.Name())
+	if pkg.Path() != "example.com/test" {
+		panic(fmt.Sprintf("Package path mismatch: expected example.com/test, got %s", pkg.Path()))
+	}
+	if pkg.Name() != "test" {
+		panic(fmt.Sprintf("Package name mismatch: expected test, got %s", pkg.Name()))
+	}
+
+	scope := pkg.Scope()
+	if scope == nil {
+		panic("Package.Scope returned nil")
+	}
+
+	varObj := types.NewVar(token.NoPos, pkg, "x", types.Typ[types.Int])
+	scope.Insert(varObj)
+
+	result := pkg.Scope().Lookup("x")
+	if result != varObj {
+		panic("Package scope lookup failed")
+	}
+
+	fmt.Println("SUCCESS: Package operations work correctly\n")
+}
+
+func testNamed() {
+	fmt.Println("\n=== Test Named Types ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+	typeName := types.NewTypeName(token.NoPos, pkg, "MyInt", nil)
+	named := types.NewNamed(typeName, types.Typ[types.Int], nil)
+
+	fmt.Printf("Named type: %v, Underlying: %v\n", named, named.Underlying())
+
+	if named.Obj() != typeName {
+		panic("Named.Obj failed")
+	}
+
+	fmt.Println("SUCCESS: Named type operations work correctly\n")
+}
+
+func testInterface() {
+	fmt.Println("\n=== Test Interface ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+
+	posMethod := types.NewFunc(token.NoPos, pkg, "Pos", types.NewSignatureType(nil, nil, nil, nil, types.NewTuple(types.NewVar(0, pkg, "", types.Typ[types.Int])), false))
+	endMethod := types.NewFunc(token.NoPos, pkg, "End", types.NewSignatureType(nil, nil, nil, nil, types.NewTuple(types.NewVar(0, pkg, "", types.Typ[types.Int])), false))
+
+	methods := []*types.Func{posMethod, endMethod}
+	iface := types.NewInterfaceType(methods, nil)
+	iface.Complete()
+
+	fmt.Printf("Interface with %d methods\n", iface.NumMethods())
+	if iface.NumMethods() != 2 {
+		panic(fmt.Sprintf("Interface method count mismatch: expected 2, got %d", iface.NumMethods()))
+	}
+
+	method := iface.Method(0)
+	fmt.Printf("Method 0: %s\n", method.Name())
+	if method.Name() != "End" && method.Name() != "Pos" {
+		panic(fmt.Sprintf("Unexpected method name: %s", method.Name()))
+	}
+
+	fmt.Println("SUCCESS: Interface operations work correctly\n")
+}
+
+func testStruct() {
+	fmt.Println("\n=== Test Struct ===")
+
+	fields := []*types.Var{
+		types.NewField(token.NoPos, nil, "X", types.Typ[types.Int], false),
+		types.NewField(token.NoPos, nil, "Y", types.Typ[types.String], false),
+	}
+
+	structType := types.NewStruct(fields, nil)
+	fmt.Printf("Struct with %d fields\n", structType.NumFields())
+	if structType.NumFields() != 2 {
+		panic(fmt.Sprintf("Struct field count mismatch: expected 2, got %d", structType.NumFields()))
+	}
+
+	field0 := structType.Field(0)
+	fmt.Printf("Field 0: Name=%s, Type=%v\n", field0.Name(), field0.Type())
+	if field0.Name() != "X" {
+		panic(fmt.Sprintf("Field 0 name mismatch: expected X, got %s", field0.Name()))
+	}
+	if field0.Type() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Field 0 type mismatch: expected int, got %v", field0.Type()))
+	}
+
+	fmt.Println("SUCCESS: Struct operations work correctly\n")
+}
+
+func testSignature() {
+	fmt.Println("\n=== Test Signature ===")
+
+	params := types.NewTuple(
+		types.NewVar(token.NoPos, nil, "x", types.Typ[types.Int]),
+		types.NewVar(token.NoPos, nil, "y", types.Typ[types.String]),
+	)
+
+	results := types.NewTuple(
+		types.NewVar(token.NoPos, nil, "", types.Typ[types.Bool]),
+	)
+
+	sig := types.NewSignatureType(nil, nil, nil, params, results, false)
+
+	fmt.Printf("Signature: %d params, %d results\n", sig.Params().Len(), sig.Results().Len())
+	if sig.Params().Len() != 2 {
+		panic(fmt.Sprintf("Signature param count mismatch: expected 2, got %d", sig.Params().Len()))
+	}
+	if sig.Results().Len() != 1 {
+		panic(fmt.Sprintf("Signature result count mismatch: expected 1, got %d", sig.Results().Len()))
+	}
+
+	param0 := sig.Params().At(0)
+	fmt.Printf("Param 0: Name=%s, Type=%v\n", param0.Name(), param0.Type())
+	if param0.Name() != "x" {
+		panic(fmt.Sprintf("Param 0 name mismatch: expected x, got %s", param0.Name()))
+	}
+	if param0.Type() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Param 0 type mismatch: expected int, got %v", param0.Type()))
+	}
+
+	fmt.Println("SUCCESS: Signature operations work correctly\n")
+}
+
+func testTuple() {
+	fmt.Println("\n=== Test Tuple ===")
+
+	tuple := types.NewTuple(
+		types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]),
+		types.NewVar(token.NoPos, nil, "b", types.Typ[types.String]),
+	)
+
+	fmt.Printf("Tuple length: %d\n", tuple.Len())
+	if tuple.Len() != 2 {
+		panic(fmt.Sprintf("Tuple length mismatch: expected 2, got %d", tuple.Len()))
+	}
+
+	var0 := tuple.At(0)
+	fmt.Printf("Element 0: Name=%s, Type=%v\n", var0.Name(), var0.Type())
+	if var0.Name() != "a" {
+		panic(fmt.Sprintf("Tuple element 0 name mismatch: expected a, got %s", var0.Name()))
+	}
+	if var0.Type() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Tuple element 0 type mismatch: expected int, got %v", var0.Type()))
+	}
+
+	fmt.Println("SUCCESS: Tuple operations work correctly\n")
+}
+
+func testArray() {
+	fmt.Println("\n=== Test Array ===")
+
+	arrayType := types.NewArray(types.Typ[types.Int], 10)
+	fmt.Printf("Array type: %v, Elem: %v, Len: %d\n", arrayType, arrayType.Elem(), arrayType.Len())
+	if arrayType.Len() != 10 {
+		panic(fmt.Sprintf("Array length mismatch: expected 10, got %d", arrayType.Len()))
+	}
+	if arrayType.Elem() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Array element type mismatch: expected int, got %v", arrayType.Elem()))
+	}
+
+	fmt.Println("SUCCESS: Array operations work correctly\n")
+}
+
+func testSlice() {
+	fmt.Println("\n=== Test Slice ===")
+
+	sliceType := types.NewSlice(types.Typ[types.String])
+	fmt.Printf("Slice type: %v, Elem: %v\n", sliceType, sliceType.Elem())
+	if sliceType.Elem() != types.Typ[types.String] {
+		panic(fmt.Sprintf("Slice element type mismatch: expected string, got %v", sliceType.Elem()))
+	}
+
+	fmt.Println("SUCCESS: Slice operations work correctly\n")
+}
+
+func testPointer() {
+	fmt.Println("\n=== Test Pointer ===")
+
+	ptrType := types.NewPointer(types.Typ[types.Int])
+	fmt.Printf("Pointer type: %v, Elem: %v\n", ptrType, ptrType.Elem())
+	if ptrType.Elem() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Pointer element type mismatch: expected int, got %v", ptrType.Elem()))
+	}
+
+	fmt.Println("SUCCESS: Pointer operations work correctly\n")
+}
+
+func testMap() {
+	fmt.Println("\n=== Test Map ===")
+
+	mapType := types.NewMap(types.Typ[types.String], types.Typ[types.Int])
+	fmt.Printf("Map type: %v, Key: %v, Elem: %v\n", mapType, mapType.Key(), mapType.Elem())
+	if mapType.Key() != types.Typ[types.String] {
+		panic(fmt.Sprintf("Map key type mismatch: expected string, got %v", mapType.Key()))
+	}
+	if mapType.Elem() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Map element type mismatch: expected int, got %v", mapType.Elem()))
+	}
+
+	fmt.Println("SUCCESS: Map operations work correctly\n")
+}
+
+func testChan() {
+	fmt.Println("\n=== Test Chan ===" )
+
+	chanType := types.NewChan(types.SendRecv, types.Typ[types.Int])
+	fmt.Printf("Chan type: %v, Dir: %v, Elem: %v\n", chanType, chanType.Dir(), chanType.Elem())
+	if chanType.Dir() != types.SendRecv {
+		panic(fmt.Sprintf("Chan direction mismatch: expected SendRecv, got %v", chanType.Dir()))
+	}
+	if chanType.Elem() != types.Typ[types.Int] {
+		panic(fmt.Sprintf("Chan element type mismatch: expected int, got %v", chanType.Elem()))
+	}
+
+	sendChan := types.NewChan(types.SendOnly, types.Typ[types.String])
+	fmt.Printf("SendOnly chan: %v, Dir: %v\n", sendChan, sendChan.Dir())
+	if sendChan.Dir() != types.SendOnly {
+		panic(fmt.Sprintf("SendOnly chan direction mismatch: expected SendOnly, got %v", sendChan.Dir()))
+	}
+
+	recvChan := types.NewChan(types.RecvOnly, types.Typ[types.Bool])
+	fmt.Printf("RecvOnly chan: %v, Dir: %v\n", recvChan, recvChan.Dir())
+	if recvChan.Dir() != types.RecvOnly {
+		panic(fmt.Sprintf("RecvOnly chan direction mismatch: expected RecvOnly, got %v", recvChan.Dir()))
+	}
+
+	fmt.Println("SUCCESS: Chan operations work correctly\n")
+}
+
+func testTypeComparison() {
+	fmt.Println("\n=== Test Type Comparison Functions ===")
+
+	t1 := types.Typ[types.Int]
+	t2 := types.Typ[types.Int]
+	t3 := types.Typ[types.String]
+
+	if !types.Identical(t1, t2) {
+		panic("Identical failed: int should be identical to int")
+	}
+	fmt.Printf("Identical(int, int): %v\n", types.Identical(t1, t2))
+	fmt.Printf("Identical(int, string): %v\n", types.Identical(t1, t3))
+
+	if !types.AssignableTo(t1, t2) {
+		panic("AssignableTo failed")
+	}
+	fmt.Printf("AssignableTo(int, int): %v\n", types.AssignableTo(t1, t2))
+	fmt.Printf("AssignableTo(int, string): %v\n", types.AssignableTo(t1, t3))
+
+	fmt.Printf("Comparable(int): %v\n", types.Comparable(t1))
+	fmt.Printf("Comparable(string): %v\n", types.Comparable(t3))
+
+	fmt.Printf("ConvertibleTo(int, int): %v\n", types.ConvertibleTo(t1, t2))
+
+	fmt.Println("SUCCESS: Type comparison functions work correctly\n")
+}
+
+func testTypeChecking() {
+	fmt.Println("\n=== Test Type Checking Functions ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+
+	m1 := types.NewFunc(token.NoPos, pkg, "Method1", types.NewSignatureType(nil, nil, nil, nil, nil, false))
+	m2 := types.NewFunc(token.NoPos, pkg, "Method2", types.NewSignatureType(nil, nil, nil, nil, nil, false))
+	iface := types.NewInterfaceType([]*types.Func{m1, m2}, nil)
+	iface.Complete()
+
+	fields := []*types.Var{
+		types.NewField(token.NoPos, nil, "x", types.Typ[types.Int], false),
+	}
+	structType := types.NewStruct(fields, nil)
+
+	fmt.Printf("Implements(struct, interface): %v\n", types.Implements(structType, iface))
+	fmt.Printf("Implements(int, interface): %v\n", types.Implements(types.Typ[types.Int], iface))
+
+	emptyIface := types.NewInterfaceType(nil, nil)
+	emptyIface.Complete()
+	fmt.Printf("Implements(int, empty interface): %v\n", types.Implements(types.Typ[types.Int], emptyIface))
+
+	fmt.Printf("AssertableTo(interface, int): %v\n", types.AssertableTo(iface, types.Typ[types.Int]))
+
+	fmt.Println("SUCCESS: Type checking functions work correctly\n")
+}
+
+func testStringFunctions() {
+	fmt.Println("\n=== Test String Functions ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+	varObj := types.NewVar(token.NoPos, pkg, "myVar", types.Typ[types.Int])
+
+	objStr := types.ObjectString(varObj, nil)
+	fmt.Printf("ObjectString: %s\n", objStr)
+
+	objStrQual := types.ObjectString(varObj, types.RelativeTo(pkg))
+	fmt.Printf("ObjectString (qualified): %s\n", objStrQual)
+
+	typeStr := types.TypeString(types.Typ[types.Int], nil)
+	fmt.Printf("TypeString(int): %s\n", typeStr)
+
+	sliceType := types.NewSlice(types.Typ[types.String])
+	sliceStr := types.TypeString(sliceType, nil)
+	fmt.Printf("TypeString([]string): %s\n", sliceStr)
+
+	fmt.Println("SUCCESS: String functions work correctly\n")
+}
+
+func testLookupFunctions() {
+	fmt.Println("\n=== Test Lookup Functions ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+
+	fields := []*types.Var{
+		types.NewField(token.NoPos, pkg, "X", types.Typ[types.Int], false),
+		types.NewField(token.NoPos, pkg, "Y", types.Typ[types.String], false),
+	}
+	structType := types.NewStruct(fields, nil)
+
+	obj, index, indirect := types.LookupFieldOrMethod(structType, false, pkg, "X")
+	if obj == nil {
+		panic("LookupFieldOrMethod failed to find X")
+	}
+	fmt.Printf("LookupFieldOrMethod found: %s, index: %v, indirect: %v\n", obj.Name(), index, indirect)
+
+	obj2, index2, indirect2 := types.LookupFieldOrMethod(structType, false, pkg, "NonExistent")
+	fmt.Printf("LookupFieldOrMethod (non-existent): found=%v, index=%v, indirect=%v\n", obj2 != nil, index2, indirect2)
+
+	mset := types.NewMethodSet(structType)
+	fmt.Printf("NewMethodSet: %d methods\n", mset.Len())
+
+	fmt.Println("SUCCESS: Lookup functions work correctly\n")
+}
+
+func testUtilityFunctions() {
+	fmt.Println("\n=== Test Utility Functions ===")
+
+	pkg := types.NewPackage("example.com/test", "test")
+
+	iface := types.NewInterfaceType(nil, nil)
+	iface.Complete()
+
+	fmt.Printf("IsInterface(interface): %v\n", types.IsInterface(iface))
+	fmt.Printf("IsInterface(int): %v\n", types.IsInterface(types.Typ[types.Int]))
+
+	typedNil := types.Typ[types.UntypedNil]
+	defaultType := types.Default(typedNil)
+	fmt.Printf("Default(UntypedNil): %v\n", defaultType)
+
+	intDefault := types.Default(types.Typ[types.Int])
+	fmt.Printf("Default(int): %v\n", intDefault)
+
+	idStr := types.Id(pkg, "MyType")
+	fmt.Printf("Id(pkg, \"MyType\"): %s\n", idStr)
+
+	fmt.Println("SUCCESS: Utility functions work correctly\n")
+}

cl/_testdata/geometry1370/geometry.go

@@ -0,0 +1,25 @@
+package geometry1370
+
+type Shape interface {
+	Area() float64
+	validate() bool
+	setID(int)
+}
+
+type Rectangle struct {
+	Width, Height float64
+	id            int
+}
+
+func (r *Rectangle) Area() float64  { return r.Width * r.Height }
+func (r *Rectangle) validate() bool { return r.Width > 0 && r.Height > 0 }
+func (r *Rectangle) setID(id int)   { r.id = id }
+func (r *Rectangle) GetID() int     { return r.id }
+
+func NewRectangle(width, height float64) *Rectangle {
+	return &Rectangle{Width: width, Height: height}
+}
+
+func RegisterShape(s Shape, id int) {
+	s.setID(id)
+}

cl/_testdata/geometry1370/out.ll

@@ -0,0 +1,90 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testdata/geometry1370'
+source_filename = "github.com/goplus/llgo/cl/_testdata/geometry1370"
+
+%"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle" = type { double, double, i64 }
+%"github.com/goplus/llgo/runtime/internal/runtime.iface" = type { ptr, ptr }
+
+@"github.com/goplus/llgo/cl/_testdata/geometry1370.init$guard" = global i1 false, align 1
+
+define ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.NewRectangle"(double %0, double %1) {
+_llgo_0:
+  %2 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocZ"(i64 24)
+  %3 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %2, i32 0, i32 0
+  %4 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %2, i32 0, i32 1
+  store double %0, ptr %3, align 8
+  store double %1, ptr %4, align 8
+  ret ptr %2
+}
+
+define double @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).Area"(ptr %0) {
+_llgo_0:
+  %1 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 0
+  %2 = load double, ptr %1, align 8
+  %3 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 1
+  %4 = load double, ptr %3, align 8
+  %5 = fmul double %2, %4
+  ret double %5
+}
+
+define i64 @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).GetID"(ptr %0) {
+_llgo_0:
+  %1 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 2
+  %2 = load i64, ptr %1, align 4
+  ret i64 %2
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).setID"(ptr %0, i64 %1) {
+_llgo_0:
+  %2 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 2
+  store i64 %1, ptr %2, align 4
+  ret void
+}
+
+define i1 @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).validate"(ptr %0) {
+_llgo_0:
+  %1 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 0
+  %2 = load double, ptr %1, align 8
+  %3 = fcmp ogt double %2, 0.000000e+00
+  br i1 %3, label %_llgo_1, label %_llgo_2
+
+_llgo_1:                                          ; preds = %_llgo_0
+  %4 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", ptr %0, i32 0, i32 1
+  %5 = load double, ptr %4, align 8
+  %6 = fcmp ogt double %5, 0.000000e+00
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  %7 = phi i1 [ false, %_llgo_0 ], [ %6, %_llgo_1 ]
+  ret i1 %7
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/geometry1370.RegisterShape"(%"github.com/goplus/llgo/runtime/internal/runtime.iface" %0, i64 %1) {
+_llgo_0:
+  %2 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.IfacePtrData"(%"github.com/goplus/llgo/runtime/internal/runtime.iface" %0)
+  %3 = extractvalue %"github.com/goplus/llgo/runtime/internal/runtime.iface" %0, 0
+  %4 = getelementptr ptr, ptr %3, i64 4
+  %5 = load ptr, ptr %4, align 8
+  %6 = insertvalue { ptr, ptr } undef, ptr %5, 0
+  %7 = insertvalue { ptr, ptr } %6, ptr %2, 1
+  %8 = extractvalue { ptr, ptr } %7, 1
+  %9 = extractvalue { ptr, ptr } %7, 0
+  call void %9(ptr %8, i64 %1)
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testdata/geometry1370.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.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/geometry1370.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/defercomplex/in.go

@@ -0,0 +1,51 @@
+package main
+
+func main() {
+	for _, label := range complexOrder() {
+		println(label)
+	}
+}
+
+func complexOrder() (res []string) {
+	record := func(label string) { res = append(res, label) }
+
+	defer record(label1("cleanup-final", 0))
+	defer record(label1("cleanup-before-loop", 0))
+
+	for i := 0; i < 2; i++ {
+		defer record(label1("exit-outer", i))
+		for j := 0; j < 2; j++ {
+			if j == 0 {
+				defer record(label2("branch-even", i, j))
+			} else {
+				defer record(label2("branch-odd", i, j))
+			}
+			for k := 0; k < 2; k++ {
+				nested := label3("nested", i, j, k)
+				defer record(nested)
+				if k == 1 {
+					defer record(label3("nested-tail", i, j, k))
+				}
+			}
+		}
+	}
+
+	defer record(label1("post-loop", 0))
+	return
+}
+
+func label1(prefix string, a int) string {
+	return prefix + "-" + digit(a)
+}
+
+func label2(prefix string, a, b int) string {
+	return prefix + "-" + digit(a) + "-" + digit(b)
+}
+
+func label3(prefix string, a, b, c int) string {
+	return prefix + "-" + digit(a) + "-" + digit(b) + "-" + digit(c)
+}
+
+func digit(n int) string {
+	return string(rune('0' + n))
+}

cl/_testgo/defercomplex/out.ll

@@ -0,0 +1 @@
+;

cl/_testgo/deferloop/in.go

@@ -0,0 +1,7 @@
+package main
+
+func main() {
+	for i := 0; i < 3; i++ {
+		defer println("loop", i)
+	}
+}

cl/_testgo/deferloop/out.ll

@@ -0,0 +1 @@
+;

cl/_testgo/interface1370/in.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"github.com/goplus/llgo/cl/_testdata/geometry1370"
+)
+
+func main() {
+	rect := geometry1370.NewRectangle(5.0, 3.0)
+	geometry1370.RegisterShape(rect, 42)
+	println("ID:", rect.GetID())
+}

cl/_testgo/interface1370/out.ll

@@ -0,0 +1,333 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testgo/interface1370'
+source_filename = "github.com/goplus/llgo/cl/_testgo/interface1370"
+
+%"github.com/goplus/llgo/runtime/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/runtime/internal/runtime.String" = type { ptr, i64 }
+%"github.com/goplus/llgo/runtime/abi.StructField" = type { %"github.com/goplus/llgo/runtime/internal/runtime.String", ptr, i64, %"github.com/goplus/llgo/runtime/internal/runtime.String", i1 }
+%"github.com/goplus/llgo/runtime/internal/runtime.Slice" = type { ptr, i64, i64 }
+%"github.com/goplus/llgo/runtime/abi.Method" = type { %"github.com/goplus/llgo/runtime/internal/runtime.String", ptr, ptr, ptr }
+%"github.com/goplus/llgo/runtime/abi.Imethod" = type { %"github.com/goplus/llgo/runtime/internal/runtime.String", ptr }
+
+@"github.com/goplus/llgo/cl/_testgo/interface1370.init$guard" = global i1 false, align 1
+@"_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle" = linkonce global ptr null, align 8
+@0 = private unnamed_addr constant [48 x i8] c"github.com/goplus/llgo/cl/_testdata/geometry1370", align 1
+@1 = private unnamed_addr constant [9 x i8] c"Rectangle", align 1
+@_llgo_float64 = linkonce global ptr null, align 8
+@_llgo_int = linkonce global ptr null, align 8
+@"github.com/goplus/llgo/cl/_testgo/interface1370.struct$EuRbjzGGO7GwkW6RxZGl-8lEjTdEMzAFD8LnY_SpVoQ" = linkonce global ptr null, align 8
+@2 = private unnamed_addr constant [5 x i8] c"Width", align 1
+@3 = private unnamed_addr constant [6 x i8] c"Height", align 1
+@4 = private unnamed_addr constant [2 x i8] c"id", align 1
+@5 = private unnamed_addr constant [47 x i8] c"github.com/goplus/llgo/cl/_testgo/interface1370", align 1
+@6 = private unnamed_addr constant [4 x i8] c"Area", align 1
+@"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8" = linkonce global ptr null, align 8
+@7 = private unnamed_addr constant [5 x i8] c"GetID", align 1
+@"_llgo_func$ETeB8WwW04JEq0ztcm-XPTJtuYvtpkjIsAc0-2NT9zA" = linkonce global ptr null, align 8
+@8 = private unnamed_addr constant [5 x i8] c"setID", align 1
+@9 = private unnamed_addr constant [54 x i8] c"github.com/goplus/llgo/cl/_testdata/geometry1370.setID", align 1
+@"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA" = linkonce global ptr null, align 8
+@10 = private unnamed_addr constant [8 x i8] c"validate", align 1
+@11 = private unnamed_addr constant [57 x i8] c"github.com/goplus/llgo/cl/_testdata/geometry1370.validate", align 1
+@_llgo_bool = linkonce global ptr null, align 8
+@"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk" = linkonce global ptr null, align 8
+@"*_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle" = linkonce global ptr null, align 8
+@"github.com/goplus/llgo/cl/_testgo/interface1370.iface$OopIVfjRcxQr1gmJyGi5G7hHt__vH05AREEM7PthH9o" = linkonce global ptr null, align 8
+@12 = private unnamed_addr constant [3 x i8] c"ID:", align 1
+
+define void @"github.com/goplus/llgo/cl/_testgo/interface1370.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testgo/interface1370.init$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/_testgo/interface1370.init$guard", align 1
+  call void @"github.com/goplus/llgo/cl/_testdata/geometry1370.init"()
+  call void @"github.com/goplus/llgo/cl/_testgo/interface1370.init$after"()
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testgo/interface1370.main"() {
+_llgo_0:
+  %0 = call ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.NewRectangle"(double 5.000000e+00, double 3.000000e+00)
+  %1 = load ptr, ptr @"_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  %2 = load ptr, ptr @"*_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  %3 = load ptr, ptr @"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8", align 8
+  %4 = load ptr, ptr @"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA", align 8
+  %5 = load ptr, ptr @"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk", align 8
+  %6 = load ptr, ptr @"github.com/goplus/llgo/cl/_testgo/interface1370.iface$OopIVfjRcxQr1gmJyGi5G7hHt__vH05AREEM7PthH9o", align 8
+  %7 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewItab"(ptr %6, ptr %2)
+  %8 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.iface" undef, ptr %7, 0
+  %9 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.iface" %8, ptr %0, 1
+  call void @"github.com/goplus/llgo/cl/_testdata/geometry1370.RegisterShape"(%"github.com/goplus/llgo/runtime/internal/runtime.iface" %9, i64 42)
+  %10 = call i64 @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).GetID"(ptr %0)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintString"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @12, i64 3 })
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintByte"(i8 32)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintInt"(i64 %10)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintByte"(i8 10)
+  ret void
+}
+
+declare void @"github.com/goplus/llgo/cl/_testdata/geometry1370.init"()
+
+declare ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.NewRectangle"(double, double)
+
+declare void @"github.com/goplus/llgo/cl/_testdata/geometry1370.RegisterShape"(%"github.com/goplus/llgo/runtime/internal/runtime.iface", i64)
+
+define void @"github.com/goplus/llgo/cl/_testgo/interface1370.init$after"() {
+_llgo_0:
+  %0 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewNamed"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @0, i64 48 }, %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @1, i64 9 }, i64 25, i64 24, i64 0, i64 4)
+  %1 = load ptr, ptr @"_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  %2 = icmp eq ptr %1, null
+  br i1 %2, label %_llgo_1, label %_llgo_2
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store ptr %0, ptr @"_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  %3 = load ptr, ptr @_llgo_float64, align 8
+  %4 = icmp eq ptr %3, null
+  br i1 %4, label %_llgo_3, label %_llgo_4
+
+_llgo_3:                                          ; preds = %_llgo_2
+  %5 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 46)
+  store ptr %5, ptr @_llgo_float64, align 8
+  br label %_llgo_4
+
+_llgo_4:                                          ; preds = %_llgo_3, %_llgo_2
+  %6 = load ptr, ptr @_llgo_float64, align 8
+  %7 = load ptr, ptr @_llgo_int, align 8
+  %8 = icmp eq ptr %7, null
+  br i1 %8, label %_llgo_5, label %_llgo_6
+
+_llgo_5:                                          ; preds = %_llgo_4
+  %9 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 34)
+  store ptr %9, ptr @_llgo_int, align 8
+  br label %_llgo_6
+
+_llgo_6:                                          ; preds = %_llgo_5, %_llgo_4
+  %10 = load ptr, ptr @_llgo_int, align 8
+  %11 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 46)
+  %12 = call %"github.com/goplus/llgo/runtime/abi.StructField" @"github.com/goplus/llgo/runtime/internal/runtime.StructField"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @2, i64 5 }, ptr %11, i64 0, %"github.com/goplus/llgo/runtime/internal/runtime.String" zeroinitializer, i1 false)
+  %13 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 46)
+  %14 = call %"github.com/goplus/llgo/runtime/abi.StructField" @"github.com/goplus/llgo/runtime/internal/runtime.StructField"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @3, i64 6 }, ptr %13, i64 8, %"github.com/goplus/llgo/runtime/internal/runtime.String" zeroinitializer, i1 false)
+  %15 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 34)
+  %16 = call %"github.com/goplus/llgo/runtime/abi.StructField" @"github.com/goplus/llgo/runtime/internal/runtime.StructField"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @4, i64 2 }, ptr %15, i64 16, %"github.com/goplus/llgo/runtime/internal/runtime.String" zeroinitializer, i1 false)
+  %17 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 168)
+  %18 = getelementptr %"github.com/goplus/llgo/runtime/abi.StructField", ptr %17, i64 0
+  store %"github.com/goplus/llgo/runtime/abi.StructField" %12, ptr %18, align 8
+  %19 = getelementptr %"github.com/goplus/llgo/runtime/abi.StructField", ptr %17, i64 1
+  store %"github.com/goplus/llgo/runtime/abi.StructField" %14, ptr %19, align 8
+  %20 = getelementptr %"github.com/goplus/llgo/runtime/abi.StructField", ptr %17, i64 2
+  store %"github.com/goplus/llgo/runtime/abi.StructField" %16, ptr %20, align 8
+  %21 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %17, 0
+  %22 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %21, i64 3, 1
+  %23 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %22, i64 3, 2
+  %24 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Struct"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @5, i64 47 }, i64 24, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %23)
+  store ptr %24, ptr @"github.com/goplus/llgo/cl/_testgo/interface1370.struct$EuRbjzGGO7GwkW6RxZGl-8lEjTdEMzAFD8LnY_SpVoQ", align 8
+  %25 = load ptr, ptr @"github.com/goplus/llgo/cl/_testgo/interface1370.struct$EuRbjzGGO7GwkW6RxZGl-8lEjTdEMzAFD8LnY_SpVoQ", align 8
+  br i1 %2, label %_llgo_7, label %_llgo_8
+
+_llgo_7:                                          ; preds = %_llgo_6
+  %26 = load ptr, ptr @"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8", align 8
+  %27 = icmp eq ptr %26, null
+  br i1 %27, label %_llgo_9, label %_llgo_10
+
+_llgo_8:                                          ; preds = %_llgo_18, %_llgo_6
+  %28 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewNamed"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @0, i64 48 }, %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @1, i64 9 }, i64 25, i64 24, i64 0, i64 4)
+  %29 = load ptr, ptr @"*_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  %30 = icmp eq ptr %29, null
+  br i1 %30, label %_llgo_19, label %_llgo_20
+
+_llgo_9:                                          ; preds = %_llgo_7
+  %31 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %32 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %31, 0
+  %33 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %32, i64 0, 1
+  %34 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %33, i64 0, 2
+  %35 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 46)
+  %36 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
+  %37 = getelementptr ptr, ptr %36, i64 0
+  store ptr %35, ptr %37, align 8
+  %38 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %36, 0
+  %39 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %38, i64 1, 1
+  %40 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %39, i64 1, 2
+  %41 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Func"(%"github.com/goplus/llgo/runtime/internal/runtime.Slice" %34, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %40, i1 false)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr %41)
+  store ptr %41, ptr @"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8", align 8
+  br label %_llgo_10
+
+_llgo_10:                                         ; preds = %_llgo_9, %_llgo_7
+  %42 = load ptr, ptr @"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8", align 8
+  %43 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @6, i64 4 }, ptr undef, ptr undef, ptr undef }, ptr %42, 1
+  %44 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %43, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).Area", 2
+  %45 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %44, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).Area", 3
+  %46 = load ptr, ptr @"_llgo_func$ETeB8WwW04JEq0ztcm-XPTJtuYvtpkjIsAc0-2NT9zA", align 8
+  %47 = icmp eq ptr %46, null
+  br i1 %47, label %_llgo_11, label %_llgo_12
+
+_llgo_11:                                         ; preds = %_llgo_10
+  %48 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %49 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %48, 0
+  %50 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %49, i64 0, 1
+  %51 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %50, i64 0, 2
+  %52 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 34)
+  %53 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
+  %54 = getelementptr ptr, ptr %53, i64 0
+  store ptr %52, ptr %54, align 8
+  %55 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %53, 0
+  %56 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %55, i64 1, 1
+  %57 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %56, i64 1, 2
+  %58 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Func"(%"github.com/goplus/llgo/runtime/internal/runtime.Slice" %51, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %57, i1 false)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr %58)
+  store ptr %58, ptr @"_llgo_func$ETeB8WwW04JEq0ztcm-XPTJtuYvtpkjIsAc0-2NT9zA", align 8
+  br label %_llgo_12
+
+_llgo_12:                                         ; preds = %_llgo_11, %_llgo_10
+  %59 = load ptr, ptr @"_llgo_func$ETeB8WwW04JEq0ztcm-XPTJtuYvtpkjIsAc0-2NT9zA", align 8
+  %60 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @7, i64 5 }, ptr undef, ptr undef, ptr undef }, ptr %59, 1
+  %61 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %60, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).GetID", 2
+  %62 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %61, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).GetID", 3
+  %63 = load ptr, ptr @"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA", align 8
+  %64 = icmp eq ptr %63, null
+  br i1 %64, label %_llgo_13, label %_llgo_14
+
+_llgo_13:                                         ; preds = %_llgo_12
+  %65 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 34)
+  %66 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
+  %67 = getelementptr ptr, ptr %66, i64 0
+  store ptr %65, ptr %67, align 8
+  %68 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %66, 0
+  %69 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %68, i64 1, 1
+  %70 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %69, i64 1, 2
+  %71 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %72 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %71, 0
+  %73 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %72, i64 0, 1
+  %74 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %73, i64 0, 2
+  %75 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Func"(%"github.com/goplus/llgo/runtime/internal/runtime.Slice" %70, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %74, i1 false)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr %75)
+  store ptr %75, ptr @"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA", align 8
+  br label %_llgo_14
+
+_llgo_14:                                         ; preds = %_llgo_13, %_llgo_12
+  %76 = load ptr, ptr @"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA", align 8
+  %77 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @9, i64 54 }, ptr undef, ptr undef, ptr undef }, ptr %76, 1
+  %78 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %77, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).setID", 2
+  %79 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %78, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).setID", 3
+  %80 = load ptr, ptr @_llgo_bool, align 8
+  %81 = icmp eq ptr %80, null
+  br i1 %81, label %_llgo_15, label %_llgo_16
+
+_llgo_15:                                         ; preds = %_llgo_14
+  %82 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 33)
+  store ptr %82, ptr @_llgo_bool, align 8
+  br label %_llgo_16
+
+_llgo_16:                                         ; preds = %_llgo_15, %_llgo_14
+  %83 = load ptr, ptr @_llgo_bool, align 8
+  %84 = load ptr, ptr @"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk", align 8
+  %85 = icmp eq ptr %84, null
+  br i1 %85, label %_llgo_17, label %_llgo_18
+
+_llgo_17:                                         ; preds = %_llgo_16
+  %86 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %87 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %86, 0
+  %88 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %87, i64 0, 1
+  %89 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %88, i64 0, 2
+  %90 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 33)
+  %91 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
+  %92 = getelementptr ptr, ptr %91, i64 0
+  store ptr %90, ptr %92, align 8
+  %93 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %91, 0
+  %94 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %93, i64 1, 1
+  %95 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %94, i64 1, 2
+  %96 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Func"(%"github.com/goplus/llgo/runtime/internal/runtime.Slice" %89, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %95, i1 false)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr %96)
+  store ptr %96, ptr @"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk", align 8
+  br label %_llgo_18
+
+_llgo_18:                                         ; preds = %_llgo_17, %_llgo_16
+  %97 = load ptr, ptr @"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk", align 8
+  %98 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @11, i64 57 }, ptr undef, ptr undef, ptr undef }, ptr %97, 1
+  %99 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %98, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).validate", 2
+  %100 = insertvalue %"github.com/goplus/llgo/runtime/abi.Method" %99, ptr @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).validate", 3
+  %101 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 160)
+  %102 = getelementptr %"github.com/goplus/llgo/runtime/abi.Method", ptr %101, i64 0
+  store %"github.com/goplus/llgo/runtime/abi.Method" %45, ptr %102, align 8
+  %103 = getelementptr %"github.com/goplus/llgo/runtime/abi.Method", ptr %101, i64 1
+  store %"github.com/goplus/llgo/runtime/abi.Method" %62, ptr %103, align 8
+  %104 = getelementptr %"github.com/goplus/llgo/runtime/abi.Method", ptr %101, i64 2
+  store %"github.com/goplus/llgo/runtime/abi.Method" %79, ptr %104, align 8
+  %105 = getelementptr %"github.com/goplus/llgo/runtime/abi.Method", ptr %101, i64 3
+  store %"github.com/goplus/llgo/runtime/abi.Method" %100, ptr %105, align 8
+  %106 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %101, 0
+  %107 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %106, i64 4, 1
+  %108 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %107, i64 4, 2
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.InitNamed"(ptr %0, ptr %25, { ptr, i64, i64 } zeroinitializer, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %108)
+  br label %_llgo_8
+
+_llgo_19:                                         ; preds = %_llgo_8
+  %109 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.PointerTo"(ptr %28)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr %109)
+  store ptr %109, ptr @"*_llgo_github.com/goplus/llgo/cl/_testdata/geometry1370.Rectangle", align 8
+  br label %_llgo_20
+
+_llgo_20:                                         ; preds = %_llgo_19, %_llgo_8
+  %110 = load ptr, ptr @"_llgo_func$UYiLlmcWxoOKZPPzvR4LByitNeKoVGoTrB_5ubdOWW8", align 8
+  %111 = load ptr, ptr @"_llgo_func$VZ-8VPNF1RaLICwxc1Ghn7BbgyFX3v762OCdx127EkA", align 8
+  %112 = load ptr, ptr @"_llgo_func$YHeRw3AOvQtzv982-ZO3Yn8vh3Fx89RM3VvI8E4iKVk", align 8
+  %113 = insertvalue %"github.com/goplus/llgo/runtime/abi.Imethod" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @6, i64 4 }, ptr undef }, ptr %110, 1
+  %114 = insertvalue %"github.com/goplus/llgo/runtime/abi.Imethod" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @9, i64 54 }, ptr undef }, ptr %111, 1
+  %115 = insertvalue %"github.com/goplus/llgo/runtime/abi.Imethod" { %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @11, i64 57 }, ptr undef }, ptr %112, 1
+  %116 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 72)
+  %117 = getelementptr %"github.com/goplus/llgo/runtime/abi.Imethod", ptr %116, i64 0
+  store %"github.com/goplus/llgo/runtime/abi.Imethod" %113, ptr %117, align 8
+  %118 = getelementptr %"github.com/goplus/llgo/runtime/abi.Imethod", ptr %116, i64 1
+  store %"github.com/goplus/llgo/runtime/abi.Imethod" %114, ptr %118, align 8
+  %119 = getelementptr %"github.com/goplus/llgo/runtime/abi.Imethod", ptr %116, i64 2
+  store %"github.com/goplus/llgo/runtime/abi.Imethod" %115, ptr %119, align 8
+  %120 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" undef, ptr %116, 0
+  %121 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %120, i64 3, 1
+  %122 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %121, i64 3, 2
+  %123 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Interface"(%"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @5, i64 47 }, %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %122)
+  store ptr %123, ptr @"github.com/goplus/llgo/cl/_testgo/interface1370.iface$OopIVfjRcxQr1gmJyGi5G7hHt__vH05AREEM7PthH9o", align 8
+  ret void
+}
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewNamed"(%"github.com/goplus/llgo/runtime/internal/runtime.String", %"github.com/goplus/llgo/runtime/internal/runtime.String", i64, i64, i64, i64)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.Struct"(%"github.com/goplus/llgo/runtime/internal/runtime.String", i64, %"github.com/goplus/llgo/runtime/internal/runtime.Slice")
+
+declare %"github.com/goplus/llgo/runtime/abi.StructField" @"github.com/goplus/llgo/runtime/internal/runtime.StructField"(%"github.com/goplus/llgo/runtime/internal/runtime.String", ptr, i64, %"github.com/goplus/llgo/runtime/internal/runtime.String", i1)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.InitNamed"(ptr, ptr, %"github.com/goplus/llgo/runtime/internal/runtime.Slice", %"github.com/goplus/llgo/runtime/internal/runtime.Slice")
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.Func"(%"github.com/goplus/llgo/runtime/internal/runtime.Slice", %"github.com/goplus/llgo/runtime/internal/runtime.Slice", i1)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.SetDirectIface"(ptr)
+
+declare double @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).Area"(ptr)
+
+declare i64 @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).GetID"(ptr)
+
+declare void @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).setID"(ptr, i64)
+
+declare i1 @"github.com/goplus/llgo/cl/_testdata/geometry1370.(*Rectangle).validate"(ptr)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.PointerTo"(ptr)
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.Interface"(%"github.com/goplus/llgo/runtime/internal/runtime.String", %"github.com/goplus/llgo/runtime/internal/runtime.Slice")
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewItab"(ptr, ptr)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.PrintString"(%"github.com/goplus/llgo/runtime/internal/runtime.String")
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.PrintByte"(i8)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.PrintInt"(i64)

cl/_testrt/stacksave/in.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"unsafe"
+	_ "unsafe"
+)
+
+//go:linkname getsp llgo.stackSave
+func getsp() unsafe.Pointer
+
+func main() {
+	sp := getsp()
+	println(sp)
+}

cl/_testrt/stacksave/out.ll

@@ -0,0 +1,34 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testrt/stacksave'
+source_filename = "github.com/goplus/llgo/cl/_testrt/stacksave"
+
+@"github.com/goplus/llgo/cl/_testrt/stacksave.init$guard" = global i1 false, align 1
+
+define void @"github.com/goplus/llgo/cl/_testrt/stacksave.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testrt/stacksave.init$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/_testrt/stacksave.init$guard", align 1
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testrt/stacksave.main"() {
+_llgo_0:
+  %0 = call ptr @llvm.stacksave()
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintPointer"(ptr %0)
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.PrintByte"(i8 10)
+  ret void
+}
+
+; Function Attrs: nocallback nofree nosync nounwind willreturn
+declare ptr @llvm.stacksave() #0
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.PrintPointer"(ptr)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.PrintByte"(i8)
+
+attributes #0 = { nocallback nofree nosync nounwind willreturn }

cl/compile.go

@@ -98,18 +98,19 @@ type pkgInfo struct {
 type none = struct{}
 
 type context struct {
-	prog   llssa.Program
-	pkg    llssa.Package
-	fn     llssa.Function
-	fset   *token.FileSet
-	goProg *ssa.Program
-	goTyps *types.Package
-	goPkg  *ssa.Package
-	pyMod  string
-	skips  map[string]none
-	loaded map[*types.Package]*pkgInfo // loaded packages
-	bvals  map[ssa.Value]llssa.Expr    // block values
-	vargs  map[*ssa.Alloc][]llssa.Expr // varargs
+	prog        llssa.Program
+	pkg         llssa.Package
+	fn          llssa.Function
+	fset        *token.FileSet
+	goProg      *ssa.Program
+	goTyps      *types.Package
+	goPkg       *ssa.Package
+	pyMod       string
+	skips       map[string]none
+	loaded      map[*types.Package]*pkgInfo // loaded packages
+	bvals       map[ssa.Value]llssa.Expr    // block values
+	vargs       map[*ssa.Alloc][]llssa.Expr // varargs
+	paramDIVars map[*types.Var]llssa.DIVar
 
 	patches  Patches
 	blkInfos []blocks.Info
@@ -263,6 +264,8 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 		if f.Recover != nil { // set recover block
 			fn.SetRecover(fn.Block(f.Recover.Index))
 		}
+		dbgEnabled := enableDbg && (f == nil || f.Origin() == nil)
+		dbgSymsEnabled := enableDbgSyms && (f == nil || f.Origin() == nil)
 		p.inits = append(p.inits, func() {
 			p.fn = fn
 			p.state = state // restore pkgState when compiling funcBody
@@ -270,6 +273,11 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 				p.fn = nil
 			}()
 			p.phis = nil
+			if dbgSymsEnabled {
+				p.paramDIVars = make(map[*types.Var]llssa.DIVar)
+			} else {
+				p.paramDIVars = nil
+			}
 			if debugGoSSA {
 				f.WriteTo(os.Stderr)
 			}
@@ -277,7 +285,7 @@ func (p *context) compileFuncDecl(pkg llssa.Package, f *ssa.Function) (llssa.Fun
 				log.Println("==> FuncBody", name)
 			}
 			b := fn.NewBuilder()
-			if enableDbg {
+			if dbgEnabled {
 				pos := p.goProg.Fset.Position(f.Pos())
 				bodyPos := p.getFuncBodyPos(f)
 				b.DebugFunction(fn, pos, bodyPos)
@@ -371,6 +379,9 @@ func (p *context) debugParams(b llssa.Builder, f *ssa.Function) {
 		ty := param.Type()
 		argNo := i + 1
 		div := b.DIVarParam(p.fn, pos, param.Name(), p.type_(ty, llssa.InGo), argNo)
+		if p.paramDIVars != nil {
+			p.paramDIVars[variable] = div
+		}
 		b.DIParam(variable, v, div, p.fn, pos, p.fn.Block(0))
 	}
 }
@@ -388,7 +399,7 @@ func (p *context) compileBlock(b llssa.Builder, block *ssa.BasicBlock, n int, do
 		b.Printf("call " + fn.Name() + "\n\x00")
 	}
 	// place here to avoid wrong current-block
-	if enableDbgSyms && block.Index == 0 {
+	if enableDbgSyms && block.Parent().Origin() == nil && block.Index == 0 {
 		p.debugParams(b, block.Parent())
 	}
 	if doModInit {
@@ -783,7 +794,7 @@ func (p *context) compileInstr(b llssa.Builder, instr ssa.Instruction) {
 		p.compileInstrOrValue(b, iv, false)
 		return
 	}
-	if enableDbg {
+	if enableDbg && instr.Parent().Origin() == nil {
 		scope := p.getDebugLocScope(instr.Parent(), instr.Pos())
 		if scope != nil {
 			diScope := b.DIScope(p.fn, scope)
@@ -846,7 +857,7 @@ func (p *context) compileInstr(b llssa.Builder, instr ssa.Instruction) {
 		x := p.compileValue(b, v.X)
 		b.Send(ch, x)
 	case *ssa.DebugRef:
-		if enableDbgSyms {
+		if enableDbgSyms && v.Parent().Origin() == nil {
 			p.debugRef(b, v)
 		}
 	default:
@@ -855,14 +866,13 @@ func (p *context) compileInstr(b llssa.Builder, instr ssa.Instruction) {
 }
 
 func (p *context) getLocalVariable(b llssa.Builder, fn *ssa.Function, v *types.Var) llssa.DIVar {
-	pos := p.fset.Position(v.Pos())
-	t := p.type_(v.Type(), llssa.InGo)
-	for i, param := range fn.Params {
-		if param.Object().(*types.Var) == v {
-			argNo := i + 1
-			return b.DIVarParam(p.fn, pos, v.Name(), t, argNo)
+	if p.paramDIVars != nil {
+		if div, ok := p.paramDIVars[v]; ok {
+			return div
 		}
 	}
+	pos := p.fset.Position(v.Pos())
+	t := p.type_(v.Type(), llssa.InGo)
 	scope := b.DIScope(p.fn, v.Parent())
 	return b.DIVarAuto(scope, pos, v.Name(), t)
 }

cl/import.go

@@ -503,7 +503,8 @@ const (
 	llgoCgoCheckPointer = llgoCgoBase + 0x6
 	llgoCgoCgocall      = llgoCgoBase + 0x7
 
-	llgoAsm = llgoInstrBase + 0x40
+	llgoAsm       = llgoInstrBase + 0x40
+	llgoStackSave = llgoInstrBase + 0x41
 
 	llgoAtomicOpLast = llgoAtomicOpBase + int(llssa.OpUMin)
 )

cl/instr.go

@@ -425,7 +425,8 @@ var llgoInstrs = map[string]int{
 	"_cgoCheckPointer":     llgoCgoCheckPointer,
 	"_cgo_runtime_cgocall": llgoCgoCgocall,
 
-	"asm": llgoAsm,
+	"asm":       llgoAsm,
+	"stackSave": llgoStackSave,
 }
 
 // funcOf returns a function by name and set ftype = goFunc, cFunc, etc.
@@ -601,6 +602,8 @@ func (p *context) call(b llssa.Builder, act llssa.DoAction, call *ssa.CallCommon
 			ret = p.sigsetjmp(b, args)
 		case llgoSiglongjmp:
 			p.siglongjmp(b, args)
+		case llgoStackSave:
+			ret = b.StackSave()
 		case llgoSigjmpbuf: // func sigjmpbuf()
 			ret = b.AllocaSigjmpBuf()
 		case llgoDeferData: // func deferData() *Defer

doc/defer-tls-gc.md

@@ -0,0 +1,32 @@
+# Defer Loop GC Integration
+
+## Background
+
+`defer` chains are stored in a per-thread TLS slot so that unwind paths can locate the active `*runtime.Defer`. With the default allocator (`AllocU`) backed by Boehm GC (bdwgc), those TLS-resident pointers were invisible to the collector. In stress scenarios—e.g. `TestDeferLoopStress` with 1,000,000 defers—the collector reclaimed the defer nodes, leaving dangling pointers and causing crashes inside the deferred closures.
+
+Prior experiments (`test-defer-dont-free` branch) confirmed the crash disappeared when allocations bypassed GC (plain `malloc` without `free`), pointing to a root-registration gap rather than logical corruption.
+
+## Solution Overview
+
+1. **GC-aware TLS slot helper** *(from PR [#1347](https://github.com/goplus/llgo/pull/1347))*
+   - Added `runtime/internal/clite/tls`, which exposes `tls.Alloc` to create per-thread storage that is automatically registered as a Boehm GC root.
+   - `SetThreadDefer` delegates to this helper so every thread reuses the same GC-safe slot without bespoke plumbing.
+   - The package handles TLS key creation, root registration/removal, and invokes an optional destructor when a thread exits.
+
+2. **SSA codegen synchronization**
+   - `ssa/eh.go` now calls `runtime.SetThreadDefer` whenever it updates the TLS pointer (on first allocation and when restoring the previous link during unwind).
+   - Defer argument nodes and the `runtime.Defer` struct itself are allocated with `aggregateAllocU`, ensuring new memory comes from GC-managed heaps, and nodes are released via `runtime.FreeDeferNode`.
+
+3. **Non-GC builds**
+   - The `tls` helper falls back to a malloc-backed TLS slot without GC registration, while `FreeDeferNode` continues to release nodes via `c.Free` when building with `-tags nogc`.
+
+## Testing
+
+Run the stress and regression suites to validate the integration:
+
+```sh
+./llgo.sh test ./test -run TestDeferLoopStress
+./llgo.sh test ./test
+```
+
+The updated `TestDeferLoopStress` now asserts 1,000,000 loop defers execute without failure, catching regressions in GC root tracking.

go.mod

@@ -6,8 +6,8 @@ toolchain go1.24.1
 
 require (
 	github.com/goplus/cobra v1.9.12 //gop:class
-	github.com/goplus/gogen v1.19.3
-	github.com/goplus/lib v0.3.0
+	github.com/goplus/gogen v1.19.5
+	github.com/goplus/lib v0.3.1
 	github.com/goplus/llgo/runtime v0.0.0-00010101000000-000000000000
 	github.com/goplus/llvm v0.8.5
 	github.com/goplus/mod v0.17.1

go.sum

@@ -6,10 +6,10 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/goplus/cobra v1.9.12 h1:0F9EdEbeGyITGz+mqoHoJ5KpUw97p1CkxV74IexHw5s=
 github.com/goplus/cobra v1.9.12/go.mod h1:p4LhfNJDKEpiGjGiNn0crUXL5dUPA5DX2ztYpEJR34E=
-github.com/goplus/gogen v1.19.3 h1:sMTe7xME8lWFdPL6NcULykdJtFs9CtXkNACRbaAKTiQ=
-github.com/goplus/gogen v1.19.3/go.mod h1:owX2e1EyU5WD+Nm6oH2m/GXjLdlBYcwkLO4wN8HHXZI=
-github.com/goplus/lib v0.3.0 h1:y0ZGb5Q/RikW1oMMB4Di7XIZIpuzh/7mlrR8HNbxXCA=
-github.com/goplus/lib v0.3.0/go.mod h1:SgJv3oPqLLHCu0gcL46ejOP3x7/2ry2Jtxu7ta32kp0=
+github.com/goplus/gogen v1.19.5 h1:YWPwpRA1PusPhptv9jKg/XiN+AQGiAD9r6I86mJ3lR4=
+github.com/goplus/gogen v1.19.5/go.mod h1:owX2e1EyU5WD+Nm6oH2m/GXjLdlBYcwkLO4wN8HHXZI=
+github.com/goplus/lib v0.3.1 h1:Xws4DBVvgOMu58awqB972wtvTacDbk3nqcbHjdx9KSg=
+github.com/goplus/lib v0.3.1/go.mod h1:SgJv3oPqLLHCu0gcL46ejOP3x7/2ry2Jtxu7ta32kp0=
 github.com/goplus/llvm v0.8.5 h1:DUnFeYC3Rco622tBEKGg8xkigRAV2fh5ZIfBCt7gOSs=
 github.com/goplus/llvm v0.8.5/go.mod h1:PeVK8GgzxwAYCiMiUAJb5wJR6xbhj989tu9oulKLLT4=
 github.com/goplus/mod v0.17.1 h1:ITovxDcc5zbURV/Wrp3/SBsYLgC1KrxY6pq1zMM2V94=

internal/build/build.go

@@ -780,11 +780,11 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, global l
 		}
 	})
 	// Generate main module file (needed for global variables even in library modes)
-	entryObjFile, err := genMainModuleFile(ctx, llssa.PkgRuntime, pkg, needRuntime, needPyInit)
+	entryPkg := genMainModule(ctx, llssa.PkgRuntime, pkg, needRuntime, needPyInit)
+	entryObjFile, err := exportObject(ctx, entryPkg.PkgPath, entryPkg.ExportFile, []byte(entryPkg.LPkg.String()))
 	if err != nil {
 		return err
 	}
-	// defer os.Remove(entryLLFile)
 	objFiles = append(objFiles, entryObjFile)
 
 	// Compile extra files from target configuration
@@ -914,118 +914,6 @@ func needStart(ctx *context) bool {
 	}
 }
 
-func genMainModuleFile(ctx *context, rtPkgPath string, pkg *packages.Package, needRuntime, needPyInit bool) (path string, err error) {
-	var (
-		pyInitDecl string
-		pyInit     string
-		rtInitDecl string
-		rtInit     string
-	)
-	mainPkgPath := pkg.PkgPath
-	if needRuntime {
-		rtInit = "call void @\"" + rtPkgPath + ".init\"()"
-		rtInitDecl = "declare void @\"" + rtPkgPath + ".init\"()"
-	}
-	if needPyInit {
-		pyInit = "call void @Py_Initialize()"
-		pyInitDecl = "declare void @Py_Initialize()"
-	}
-	declSizeT := "%size_t = type i64"
-	if is32Bits(ctx.buildConf.Goarch) {
-		declSizeT = "%size_t = type i32"
-	}
-	stdioDecl := ""
-	stdioNobuf := ""
-	if IsStdioNobuf() {
-		stdioDecl = `
-@stdout = external global ptr
-@stderr = external global ptr
-@__stdout = external global ptr
-@__stderr = external global ptr
-declare i32 @setvbuf(ptr, ptr, i32, %size_t)
-	`
-		stdioNobuf = `
-; Set stdout with no buffer
-%stdout_is_null = icmp eq ptr @stdout, null
-%stdout_ptr = select i1 %stdout_is_null, ptr @__stdout, ptr @stdout
-call i32 @setvbuf(ptr %stdout_ptr, ptr null, i32 2, %size_t 0)
-; Set stderr with no buffer
-%stderr_ptr = select i1 %stdout_is_null, ptr @__stderr, ptr @stderr
-call i32 @setvbuf(ptr %stderr_ptr, ptr null, i32 2, %size_t 0)
-	`
-	}
-	// TODO(lijie): workaround for libc-free
-	// Remove main/_start when -buildmode and libc are ready
-	startDefine := `
-define weak void @_start() {
-  ; argc = 0
-  %argc = add i32 0, 0
-  ; argv = null
-  %argv = inttoptr i64 0 to i8**
-  call i32 @main(i32 %argc, i8** %argv)
-  ret void
-}
-`
-	mainDefine := "define i32 @main(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr"
-	if !needStart(ctx) && isWasmTarget(ctx.buildConf.Goos) {
-		mainDefine = "define hidden noundef i32 @__main_argc_argv(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr"
-	}
-	if !needStart(ctx) {
-		startDefine = ""
-	}
-
-	var mainCode string
-	// For library modes (c-archive, c-shared), only generate global variables
-	if ctx.buildConf.BuildMode != BuildModeExe {
-		mainCode = `; ModuleID = 'main'
-source_filename = "main"
-@__llgo_argc = global i32 0, align 4
-@__llgo_argv = global ptr null, align 8
-`
-	} else {
-		// For executable mode, generate full main function
-		mainCode = fmt.Sprintf(`; ModuleID = 'main'
-source_filename = "main"
-%s
-@__llgo_argc = global i32 0, align 4
-@__llgo_argv = global ptr null, align 8
-%s
-%s
-%s
-declare void @"%s.init"()
-declare void @"%s.main"()
-define weak void @runtime.init() {
-  ret void
-}
-
-; TODO(lijie): workaround for syscall patch
-define weak void @"syscall.init"() {
-  ret void
-}
-
-%s
-
-%s {
-_llgo_0:
-  store i32 %%0, ptr @__llgo_argc, align 4
-  store ptr %%1, ptr @__llgo_argv, align 8
-  %s
-  %s
-  %s
-  call void @runtime.init()
-  call void @"%s.init"()
-  call void @"%s.main"()
-  ret i32 0
-}
-`, declSizeT, stdioDecl,
-			pyInitDecl, rtInitDecl, mainPkgPath, mainPkgPath,
-			startDefine, mainDefine, stdioNobuf,
-			pyInit, rtInit, mainPkgPath, mainPkgPath)
-	}
-
-	return exportObject(ctx, pkg.PkgPath+".main", pkg.ExportFile+"-main", []byte(mainCode))
-}
-
 func is32Bits(goarch string) bool {
 	return goarch == "386" || goarch == "arm" || goarch == "mips" || goarch == "wasm"
 }

internal/build/main_module.go

@@ -0,0 +1,213 @@
+//go:build !llgo
+// +build !llgo
+
+/*
+ * 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 build
+
+import (
+	"go/token"
+	"go/types"
+
+	"github.com/goplus/llgo/internal/packages"
+	llvm "github.com/goplus/llvm"
+
+	llssa "github.com/goplus/llgo/ssa"
+)
+
+func genMainModule(ctx *context, rtPkgPath string, pkg *packages.Package, needRuntime, needPyInit bool) Package {
+	prog := ctx.prog
+	mainPkg := prog.NewPackage("", pkg.ID+".main")
+
+	argcVar := mainPkg.NewVarEx("__llgo_argc", prog.Pointer(prog.Int32()))
+	argcVar.Init(prog.Zero(prog.Int32()))
+
+	argvValueType := prog.Pointer(prog.CStr())
+	argvVar := mainPkg.NewVarEx("__llgo_argv", prog.Pointer(argvValueType))
+	argvVar.InitNil()
+
+	exportFile := pkg.ExportFile
+	if exportFile == "" {
+		exportFile = pkg.PkgPath
+	}
+	mainAPkg := &aPackage{
+		Package: &packages.Package{
+			PkgPath:    pkg.PkgPath + ".main",
+			ExportFile: exportFile + "-main",
+		},
+		LPkg: mainPkg,
+	}
+
+	if ctx.buildConf.BuildMode != BuildModeExe {
+		return mainAPkg
+	}
+
+	runtimeStub := defineWeakNoArgStub(mainPkg, "runtime.init")
+	// Define syscall.init as a weak stub to allow linking even when syscall package is not imported
+	defineWeakNoArgStub(mainPkg, "syscall.init")
+
+	var pyInit llssa.Function
+	if needPyInit {
+		pyInit = declareNoArgFunc(mainPkg, "Py_Initialize")
+	}
+
+	var rtInit llssa.Function
+	if needRuntime {
+		rtInit = declareNoArgFunc(mainPkg, rtPkgPath+".init")
+	}
+
+	mainInit := declareNoArgFunc(mainPkg, pkg.PkgPath+".init")
+	mainMain := declareNoArgFunc(mainPkg, pkg.PkgPath+".main")
+
+	entryFn := defineEntryFunction(ctx, mainPkg, argcVar, argvVar, argvValueType, runtimeStub, mainInit, mainMain, pyInit, rtInit)
+
+	if needStart(ctx) {
+		defineStart(mainPkg, entryFn, argvValueType)
+	}
+
+	return mainAPkg
+}
+
+func defineEntryFunction(ctx *context, pkg llssa.Package, argcVar, argvVar llssa.Global, argvType llssa.Type, runtimeStub, mainInit, mainMain llssa.Function, pyInit, rtInit llssa.Function) llssa.Function {
+	prog := pkg.Prog
+	entryName := "main"
+	if !needStart(ctx) && isWasmTarget(ctx.buildConf.Goos) {
+		entryName = "__main_argc_argv"
+	}
+	sig := newEntrySignature(argvType.RawType())
+	fn := pkg.NewFunc(entryName, sig, llssa.InC)
+	fnVal := pkg.Module().NamedFunction(entryName)
+	if entryName != "main" {
+		fnVal.SetVisibility(llvm.HiddenVisibility)
+		fnVal.SetUnnamedAddr(true)
+	}
+	b := fn.MakeBody(1)
+	b.Store(argcVar.Expr, fn.Param(0))
+	b.Store(argvVar.Expr, fn.Param(1))
+	if IsStdioNobuf() {
+		emitStdioNobuf(b, pkg, ctx.buildConf.Goarch)
+	}
+	if pyInit != nil {
+		b.Call(pyInit.Expr)
+	}
+	if rtInit != nil {
+		b.Call(rtInit.Expr)
+	}
+	b.Call(runtimeStub.Expr)
+	b.Call(mainInit.Expr)
+	b.Call(mainMain.Expr)
+	b.Return(prog.IntVal(0, prog.Int32()))
+	return fn
+}
+
+func defineStart(pkg llssa.Package, entry llssa.Function, argvType llssa.Type) {
+	fn := pkg.NewFunc("_start", llssa.NoArgsNoRet, llssa.InC)
+	pkg.Module().NamedFunction("_start").SetLinkage(llvm.WeakAnyLinkage)
+	b := fn.MakeBody(1)
+	prog := pkg.Prog
+	b.Call(entry.Expr, prog.IntVal(0, prog.Int32()), prog.Nil(argvType))
+	b.Return()
+}
+
+func declareNoArgFunc(pkg llssa.Package, name string) llssa.Function {
+	return pkg.NewFunc(name, llssa.NoArgsNoRet, llssa.InC)
+}
+
+func defineWeakNoArgStub(pkg llssa.Package, name string) llssa.Function {
+	fn := pkg.NewFunc(name, llssa.NoArgsNoRet, llssa.InC)
+	pkg.Module().NamedFunction(name).SetLinkage(llvm.WeakAnyLinkage)
+	b := fn.MakeBody(1)
+	b.Return()
+	return fn
+}
+
+func emitStdioNobuf(b llssa.Builder, pkg llssa.Package, goarch string) {
+	prog := pkg.Prog
+	streamType := prog.VoidPtr()
+	streamPtrType := prog.Pointer(streamType)
+	stdout := declareExternalPtrGlobal(pkg, "stdout", streamType)
+	stderr := declareExternalPtrGlobal(pkg, "stderr", streamType)
+	stdoutAlt := declareExternalPtrGlobal(pkg, "__stdout", streamType)
+	stderrAlt := declareExternalPtrGlobal(pkg, "__stderr", streamType)
+	sizeType := prog.Uintptr()
+	setvbuf := declareSetvbuf(pkg, streamPtrType, prog.CStr(), prog.Int32(), sizeType)
+
+	stdoutSlot := b.AllocaT(streamPtrType)
+	b.Store(stdoutSlot, stdout)
+	condOut := b.BinOp(token.EQL, stdout, prog.Nil(streamPtrType))
+	b.IfThen(condOut, func() {
+		b.Store(stdoutSlot, stdoutAlt)
+	})
+	stdoutPtr := b.Load(stdoutSlot)
+
+	stderrSlot := b.AllocaT(streamPtrType)
+	b.Store(stderrSlot, stderr)
+	condErr := b.BinOp(token.EQL, stderr, prog.Nil(streamPtrType))
+	b.IfThen(condErr, func() {
+		b.Store(stderrSlot, stderrAlt)
+	})
+	stderrPtr := b.Load(stderrSlot)
+
+	mode := prog.IntVal(2, prog.Int32())
+	zeroSize := prog.Zero(sizeType)
+	nullBuf := prog.Nil(prog.CStr())
+
+	b.Call(setvbuf.Expr, stdoutPtr, nullBuf, mode, zeroSize)
+	b.Call(setvbuf.Expr, stderrPtr, nullBuf, mode, zeroSize)
+}
+
+func declareExternalPtrGlobal(pkg llssa.Package, name string, valueType llssa.Type) llssa.Expr {
+	ptrType := pkg.Prog.Pointer(valueType)
+	global := pkg.NewVarEx(name, ptrType)
+	pkg.Module().NamedGlobal(name).SetLinkage(llvm.ExternalLinkage)
+	return global.Expr
+}
+
+func declareSetvbuf(pkg llssa.Package, streamPtrType, bufPtrType, intType, sizeType llssa.Type) llssa.Function {
+	sig := newSignature(
+		[]types.Type{
+			streamPtrType.RawType(),
+			bufPtrType.RawType(),
+			intType.RawType(),
+			sizeType.RawType(),
+		},
+		[]types.Type{intType.RawType()},
+	)
+	return pkg.NewFunc("setvbuf", sig, llssa.InC)
+}
+
+func tupleOf(tys ...types.Type) *types.Tuple {
+	if len(tys) == 0 {
+		return types.NewTuple()
+	}
+	vars := make([]*types.Var, len(tys))
+	for i, t := range tys {
+		vars[i] = types.NewParam(token.NoPos, nil, "", t)
+	}
+	return types.NewTuple(vars...)
+}
+
+func newSignature(params []types.Type, results []types.Type) *types.Signature {
+	return types.NewSignatureType(nil, nil, nil, tupleOf(params...), tupleOf(results...), false)
+}
+
+func newEntrySignature(argvType types.Type) *types.Signature {
+	return newSignature(
+		[]types.Type{types.Typ[types.Int32], argvType},
+		[]types.Type{types.Typ[types.Int32]},
+	)
+}

internal/build/main_module_test.go

@@ -0,0 +1,70 @@
+//go:build !llgo
+// +build !llgo
+
+package build
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/goplus/llvm"
+
+	"github.com/goplus/llgo/internal/packages"
+	llssa "github.com/goplus/llgo/ssa"
+)
+
+func init() {
+	llssa.Initialize(llssa.InitAll)
+}
+
+func TestGenMainModuleExecutable(t *testing.T) {
+	llvm.InitializeAllTargets()
+	t.Setenv(llgoStdioNobuf, "")
+	ctx := &context{
+		prog: llssa.NewProgram(nil),
+		buildConf: &Config{
+			BuildMode: BuildModeExe,
+			Goos:      "linux",
+			Goarch:    "amd64",
+		},
+	}
+	pkg := &packages.Package{PkgPath: "example.com/foo", ExportFile: "foo.a"}
+	mod := genMainModule(ctx, llssa.PkgRuntime, pkg, true, true)
+	if mod.ExportFile != "foo.a-main" {
+		t.Fatalf("unexpected export file: %s", mod.ExportFile)
+	}
+	ir := mod.LPkg.String()
+	checks := []string{
+		"define i32 @main(",
+		"call void @Py_Initialize()",
+		"call void @\"example.com/foo.init\"()",
+		"define weak void @_start()",
+	}
+	for _, want := range checks {
+		if !strings.Contains(ir, want) {
+			t.Fatalf("main module IR missing %q:\n%s", want, ir)
+		}
+	}
+}
+
+func TestGenMainModuleLibrary(t *testing.T) {
+	llvm.InitializeAllTargets()
+	t.Setenv(llgoStdioNobuf, "")
+	ctx := &context{
+		prog: llssa.NewProgram(nil),
+		buildConf: &Config{
+			BuildMode: BuildModeCArchive,
+			Goos:      "linux",
+			Goarch:    "amd64",
+		},
+	}
+	pkg := &packages.Package{PkgPath: "example.com/foo", ExportFile: "foo.a"}
+	mod := genMainModule(ctx, llssa.PkgRuntime, pkg, false, false)
+	ir := mod.LPkg.String()
+	if strings.Contains(ir, "define i32 @main") {
+		t.Fatalf("library mode should not emit main function:\n%s", ir)
+	}
+	if !strings.Contains(ir, "@__llgo_argc = global i32 0") {
+		t.Fatalf("library mode missing argc global:\n%s", ir)
+	}
+}

internal/crosscompile/compile/libc/libc_test.go

@@ -1,3 +1,5 @@
+//go:build !llgo
+
 package libc
 
 import (

internal/env/version.go

@@ -30,8 +30,6 @@ const (
 var buildVersion string
 
 // Version returns the version of the running LLGo binary.
-//
-//export LLGoVersion
 func Version() string {
 	if buildVersion != "" {
 		return buildVersion

runtime/_overlay/go/parser/resolver.go

@@ -1,622 +0,0 @@
-// Copyright 2021 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package parser
-
-import (
-	"fmt"
-	"go/ast"
-	"go/token"
-	"strings"
-)
-
-const debugResolve = false
-
-// resolveFile walks the given file to resolve identifiers within the file
-// scope, updating ast.Ident.Obj fields with declaration information.
-//
-// If declErr is non-nil, it is used to report declaration errors during
-// resolution. tok is used to format position in error messages.
-func resolveFile(file *ast.File, handle *token.File, declErr func(token.Pos, string)) {
-	pkgScope := ast.NewScope(nil)
-	r := &resolver{
-		handle:   handle,
-		declErr:  declErr,
-		topScope: pkgScope,
-		pkgScope: pkgScope,
-		depth:    1,
-	}
-
-	for _, decl := range file.Decls {
-		ast.Walk(r, decl)
-	}
-
-	r.closeScope()
-	assert(r.topScope == nil, "unbalanced scopes")
-	assert(r.labelScope == nil, "unbalanced label scopes")
-
-	// resolve global identifiers within the same file
-	i := 0
-	for _, ident := range r.unresolved {
-		// i <= index for current ident
-		assert(ident.Obj == unresolved, "object already resolved")
-		ident.Obj = r.pkgScope.Lookup(ident.Name) // also removes unresolved sentinel
-		if ident.Obj == nil {
-			r.unresolved[i] = ident
-			i++
-		} else if debugResolve {
-			pos := ident.Obj.Decl.(interface{ Pos() token.Pos }).Pos()
-			r.trace("resolved %s@%v to package object %v", ident.Name, ident.Pos(), pos)
-		}
-	}
-	file.Scope = r.pkgScope
-	file.Unresolved = r.unresolved[0:i]
-}
-
-const maxScopeDepth int = 1e3
-
-type resolver struct {
-	handle  *token.File
-	declErr func(token.Pos, string)
-
-	// Ordinary identifier scopes
-	pkgScope   *ast.Scope   // pkgScope.Outer == nil
-	topScope   *ast.Scope   // top-most scope; may be pkgScope
-	unresolved []*ast.Ident // unresolved identifiers
-	depth      int          // scope depth
-
-	// Label scopes
-	// (maintained by open/close LabelScope)
-	labelScope  *ast.Scope     // label scope for current function
-	targetStack [][]*ast.Ident // stack of unresolved labels
-}
-
-func (r *resolver) trace(format string, args ...any) {
-	fmt.Println(strings.Repeat(". ", r.depth) + r.sprintf(format, args...))
-}
-
-func (r *resolver) sprintf(format string, args ...any) string {
-	for i, arg := range args {
-		switch arg := arg.(type) {
-		case token.Pos:
-			args[i] = r.handle.Position(arg)
-		}
-	}
-	return fmt.Sprintf(format, args...)
-}
-
-func (r *resolver) openScope(pos token.Pos) {
-	r.depth++
-	if r.depth > maxScopeDepth {
-		panic(bailout{pos: pos, msg: "exceeded max scope depth during object resolution"})
-	}
-	if debugResolve {
-		r.trace("opening scope @%v", pos)
-	}
-	r.topScope = ast.NewScope(r.topScope)
-}
-
-func (r *resolver) closeScope() {
-	r.depth--
-	if debugResolve {
-		r.trace("closing scope")
-	}
-	r.topScope = r.topScope.Outer
-}
-
-func (r *resolver) openLabelScope() {
-	r.labelScope = ast.NewScope(r.labelScope)
-	r.targetStack = append(r.targetStack, nil)
-}
-
-func (r *resolver) closeLabelScope() {
-	// resolve labels
-	n := len(r.targetStack) - 1
-	scope := r.labelScope
-	for _, ident := range r.targetStack[n] {
-		ident.Obj = scope.Lookup(ident.Name)
-		if ident.Obj == nil && r.declErr != nil {
-			r.declErr(ident.Pos(), fmt.Sprintf("label %s undefined", ident.Name))
-		}
-	}
-	// pop label scope
-	r.targetStack = r.targetStack[0:n]
-	r.labelScope = r.labelScope.Outer
-}
-
-func (r *resolver) declare(decl, data any, scope *ast.Scope, kind ast.ObjKind, idents ...*ast.Ident) {
-	for _, ident := range idents {
-		if ident.Obj != nil {
-			panic(fmt.Sprintf("%v: identifier %s already declared or resolved", ident.Pos(), ident.Name))
-		}
-		obj := ast.NewObj(kind, ident.Name)
-		// remember the corresponding declaration for redeclaration
-		// errors and global variable resolution/typechecking phase
-		obj.Decl = decl
-		obj.Data = data
-		// Identifiers (for receiver type parameters) are written to the scope, but
-		// never set as the resolved object. See go.dev/issue/50956.
-		if _, ok := decl.(*ast.Ident); !ok {
-			ident.Obj = obj
-		}
-		if ident.Name != "_" {
-			if debugResolve {
-				r.trace("declaring %s@%v", ident.Name, ident.Pos())
-			}
-			if alt := scope.Insert(obj); alt != nil && r.declErr != nil {
-				prevDecl := ""
-				if pos := alt.Pos(); pos.IsValid() {
-					prevDecl = r.sprintf("\n\tprevious declaration at %v", pos)
-				}
-				r.declErr(ident.Pos(), fmt.Sprintf("%s redeclared in this block%s", ident.Name, prevDecl))
-			}
-		}
-	}
-}
-
-func (r *resolver) shortVarDecl(decl *ast.AssignStmt) {
-	// Go spec: A short variable declaration may redeclare variables
-	// provided they were originally declared in the same block with
-	// the same type, and at least one of the non-blank variables is new.
-	n := 0 // number of new variables
-	for _, x := range decl.Lhs {
-		if ident, isIdent := x.(*ast.Ident); isIdent {
-			assert(ident.Obj == nil, "identifier already declared or resolved")
-			obj := ast.NewObj(ast.Var, ident.Name)
-			// remember corresponding assignment for other tools
-			obj.Decl = decl
-			ident.Obj = obj
-			if ident.Name != "_" {
-				if debugResolve {
-					r.trace("declaring %s@%v", ident.Name, ident.Pos())
-				}
-				if alt := r.topScope.Insert(obj); alt != nil {
-					ident.Obj = alt // redeclaration
-				} else {
-					n++ // new declaration
-				}
-			}
-		}
-	}
-	if n == 0 && r.declErr != nil {
-		r.declErr(decl.Lhs[0].Pos(), "no new variables on left side of :=")
-	}
-}
-
-// The unresolved object is a sentinel to mark identifiers that have been added
-// to the list of unresolved identifiers. The sentinel is only used for verifying
-// internal consistency.
-var unresolved = new(ast.Object)
-
-// If x is an identifier, resolve attempts to resolve x by looking up
-// the object it denotes. If no object is found and collectUnresolved is
-// set, x is marked as unresolved and collected in the list of unresolved
-// identifiers.
-func (r *resolver) resolve(ident *ast.Ident, collectUnresolved bool) {
-	if ident.Obj != nil {
-		panic(r.sprintf("%v: identifier %s already declared or resolved", ident.Pos(), ident.Name))
-	}
-	// '_' should never refer to existing declarations, because it has special
-	// handling in the spec.
-	if ident.Name == "_" {
-		return
-	}
-	for s := r.topScope; s != nil; s = s.Outer {
-		if obj := s.Lookup(ident.Name); obj != nil {
-			if debugResolve {
-				r.trace("resolved %v:%s to %v", ident.Pos(), ident.Name, obj)
-			}
-			assert(obj.Name != "", "obj with no name")
-			// Identifiers (for receiver type parameters) are written to the scope,
-			// but never set as the resolved object. See go.dev/issue/50956.
-			if _, ok := obj.Decl.(*ast.Ident); !ok {
-				ident.Obj = obj
-			}
-			return
-		}
-	}
-	// all local scopes are known, so any unresolved identifier
-	// must be found either in the file scope, package scope
-	// (perhaps in another file), or universe scope --- collect
-	// them so that they can be resolved later
-	if collectUnresolved {
-		ident.Obj = unresolved
-		r.unresolved = append(r.unresolved, ident)
-	}
-}
-
-func (r *resolver) walkExprs(list []ast.Expr) {
-	for _, node := range list {
-		ast.Walk(r, node)
-	}
-}
-
-func Unparen(e ast.Expr) ast.Expr {
-	for {
-		paren, ok := e.(*ast.ParenExpr)
-		if !ok {
-			return e
-		}
-		e = paren.X
-	}
-}
-
-func (r *resolver) walkLHS(list []ast.Expr) {
-	for _, expr := range list {
-		expr := Unparen(expr)
-		if _, ok := expr.(*ast.Ident); !ok && expr != nil {
-			ast.Walk(r, expr)
-		}
-	}
-}
-
-func (r *resolver) walkStmts(list []ast.Stmt) {
-	for _, stmt := range list {
-		ast.Walk(r, stmt)
-	}
-}
-
-func (r *resolver) Visit(node ast.Node) ast.Visitor {
-	if debugResolve && node != nil {
-		r.trace("node %T@%v", node, node.Pos())
-	}
-
-	switch n := node.(type) {
-
-	// Expressions.
-	case *ast.Ident:
-		r.resolve(n, true)
-
-	case *ast.FuncLit:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkFuncType(n.Type)
-		r.walkBody(n.Body)
-
-	case *ast.SelectorExpr:
-		ast.Walk(r, n.X)
-		// Note: don't try to resolve n.Sel, as we don't support qualified
-		// resolution.
-
-	case *ast.StructType:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkFieldList(n.Fields, ast.Var)
-
-	case *ast.FuncType:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkFuncType(n)
-
-	case *ast.CompositeLit:
-		if n.Type != nil {
-			ast.Walk(r, n.Type)
-		}
-		for _, e := range n.Elts {
-			if kv, _ := e.(*ast.KeyValueExpr); kv != nil {
-				// See go.dev/issue/45160: try to resolve composite lit keys, but don't
-				// collect them as unresolved if resolution failed. This replicates
-				// existing behavior when resolving during parsing.
-				if ident, _ := kv.Key.(*ast.Ident); ident != nil {
-					r.resolve(ident, false)
-				} else {
-					ast.Walk(r, kv.Key)
-				}
-				ast.Walk(r, kv.Value)
-			} else {
-				ast.Walk(r, e)
-			}
-		}
-
-	case *ast.InterfaceType:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkFieldList(n.Methods, ast.Fun)
-
-	// Statements
-	case *ast.LabeledStmt:
-		r.declare(n, nil, r.labelScope, ast.Lbl, n.Label)
-		ast.Walk(r, n.Stmt)
-
-	case *ast.AssignStmt:
-		r.walkExprs(n.Rhs)
-		if n.Tok == token.DEFINE {
-			r.shortVarDecl(n)
-		} else {
-			r.walkExprs(n.Lhs)
-		}
-
-	case *ast.BranchStmt:
-		// add to list of unresolved targets
-		if n.Tok != token.FALLTHROUGH && n.Label != nil {
-			depth := len(r.targetStack) - 1
-			r.targetStack[depth] = append(r.targetStack[depth], n.Label)
-		}
-
-	case *ast.BlockStmt:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkStmts(n.List)
-
-	case *ast.IfStmt:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		if n.Init != nil {
-			ast.Walk(r, n.Init)
-		}
-		ast.Walk(r, n.Cond)
-		ast.Walk(r, n.Body)
-		if n.Else != nil {
-			ast.Walk(r, n.Else)
-		}
-
-	case *ast.CaseClause:
-		r.walkExprs(n.List)
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		r.walkStmts(n.Body)
-
-	case *ast.SwitchStmt:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		if n.Init != nil {
-			ast.Walk(r, n.Init)
-		}
-		if n.Tag != nil {
-			// The scope below reproduces some unnecessary behavior of the parser,
-			// opening an extra scope in case this is a type switch. It's not needed
-			// for expression switches.
-			// TODO: remove this once we've matched the parser resolution exactly.
-			if n.Init != nil {
-				r.openScope(n.Tag.Pos())
-				defer r.closeScope()
-			}
-			ast.Walk(r, n.Tag)
-		}
-		if n.Body != nil {
-			r.walkStmts(n.Body.List)
-		}
-
-	case *ast.TypeSwitchStmt:
-		if n.Init != nil {
-			r.openScope(n.Pos())
-			defer r.closeScope()
-			ast.Walk(r, n.Init)
-		}
-		r.openScope(n.Assign.Pos())
-		defer r.closeScope()
-		ast.Walk(r, n.Assign)
-		// s.Body consists only of case clauses, so does not get its own
-		// scope.
-		if n.Body != nil {
-			r.walkStmts(n.Body.List)
-		}
-
-	case *ast.CommClause:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		if n.Comm != nil {
-			ast.Walk(r, n.Comm)
-		}
-		r.walkStmts(n.Body)
-
-	case *ast.SelectStmt:
-		// as for switch statements, select statement bodies don't get their own
-		// scope.
-		if n.Body != nil {
-			r.walkStmts(n.Body.List)
-		}
-
-	case *ast.ForStmt:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		if n.Init != nil {
-			ast.Walk(r, n.Init)
-		}
-		if n.Cond != nil {
-			ast.Walk(r, n.Cond)
-		}
-		if n.Post != nil {
-			ast.Walk(r, n.Post)
-		}
-		ast.Walk(r, n.Body)
-
-	case *ast.RangeStmt:
-		r.openScope(n.Pos())
-		defer r.closeScope()
-		ast.Walk(r, n.X)
-		var lhs []ast.Expr
-		if n.Key != nil {
-			lhs = append(lhs, n.Key)
-		}
-		if n.Value != nil {
-			lhs = append(lhs, n.Value)
-		}
-		if len(lhs) > 0 {
-			if n.Tok == token.DEFINE {
-				// Note: we can't exactly match the behavior of object resolution
-				// during the parsing pass here, as it uses the position of the RANGE
-				// token for the RHS OpPos. That information is not contained within
-				// the AST.
-				as := &ast.AssignStmt{
-					Lhs:    lhs,
-					Tok:    token.DEFINE,
-					TokPos: n.TokPos,
-					Rhs:    []ast.Expr{&ast.UnaryExpr{Op: token.RANGE, X: n.X}},
-				}
-				// TODO(rFindley): this walkLHS reproduced the parser resolution, but
-				// is it necessary? By comparison, for a normal AssignStmt we don't
-				// walk the LHS in case there is an invalid identifier list.
-				r.walkLHS(lhs)
-				r.shortVarDecl(as)
-			} else {
-				r.walkExprs(lhs)
-			}
-		}
-		ast.Walk(r, n.Body)
-
-	// Declarations
-	case *ast.GenDecl:
-		switch n.Tok {
-		case token.CONST, token.VAR:
-			for i, spec := range n.Specs {
-				spec := spec.(*ast.ValueSpec)
-				kind := ast.Con
-				if n.Tok == token.VAR {
-					kind = ast.Var
-				}
-				r.walkExprs(spec.Values)
-				if spec.Type != nil {
-					ast.Walk(r, spec.Type)
-				}
-				r.declare(spec, i, r.topScope, kind, spec.Names...)
-			}
-		case token.TYPE:
-			for _, spec := range n.Specs {
-				spec := spec.(*ast.TypeSpec)
-				// Go spec: The scope of a type identifier declared inside a function begins
-				// at the identifier in the TypeSpec and ends at the end of the innermost
-				// containing block.
-				r.declare(spec, nil, r.topScope, ast.Typ, spec.Name)
-				if spec.TypeParams != nil {
-					r.openScope(spec.Pos())
-					r.walkTParams(spec.TypeParams)
-					r.closeScope()
-				}
-				ast.Walk(r, spec.Type)
-			}
-		}
-
-	case *ast.FuncDecl:
-		// Open the function scope.
-		r.openScope(n.Pos())
-		defer r.closeScope()
-
-		r.walkRecv(n.Recv)
-
-		// Type parameters are walked normally: they can reference each other, and
-		// can be referenced by normal parameters.
-		if n.Type.TypeParams != nil {
-			r.walkTParams(n.Type.TypeParams)
-			// TODO(rFindley): need to address receiver type parameters.
-		}
-
-		// Resolve and declare parameters in a specific order to get duplicate
-		// declaration errors in the correct location.
-		r.resolveList(n.Type.Params)
-		r.resolveList(n.Type.Results)
-		r.declareList(n.Recv, ast.Var)
-		r.declareList(n.Type.Params, ast.Var)
-		r.declareList(n.Type.Results, ast.Var)
-
-		r.walkBody(n.Body)
-		if n.Recv == nil && n.Name.Name != "init" {
-			r.declare(n, nil, r.pkgScope, ast.Fun, n.Name)
-		}
-
-	default:
-		return r
-	}
-
-	return nil
-}
-
-func (r *resolver) walkFuncType(typ *ast.FuncType) {
-	// typ.TypeParams must be walked separately for FuncDecls.
-	r.resolveList(typ.Params)
-	r.resolveList(typ.Results)
-	r.declareList(typ.Params, ast.Var)
-	r.declareList(typ.Results, ast.Var)
-}
-
-func (r *resolver) resolveList(list *ast.FieldList) {
-	if list == nil {
-		return
-	}
-	for _, f := range list.List {
-		if f.Type != nil {
-			ast.Walk(r, f.Type)
-		}
-	}
-}
-
-func (r *resolver) declareList(list *ast.FieldList, kind ast.ObjKind) {
-	if list == nil {
-		return
-	}
-	for _, f := range list.List {
-		r.declare(f, nil, r.topScope, kind, f.Names...)
-	}
-}
-
-func (r *resolver) walkRecv(recv *ast.FieldList) {
-	// If our receiver has receiver type parameters, we must declare them before
-	// trying to resolve the rest of the receiver, and avoid re-resolving the
-	// type parameter identifiers.
-	if recv == nil || len(recv.List) == 0 {
-		return // nothing to do
-	}
-	typ := recv.List[0].Type
-	if ptr, ok := typ.(*ast.StarExpr); ok {
-		typ = ptr.X
-	}
-
-	var declareExprs []ast.Expr // exprs to declare
-	var resolveExprs []ast.Expr // exprs to resolve
-	switch typ := typ.(type) {
-	case *ast.IndexExpr:
-		declareExprs = []ast.Expr{typ.Index}
-		resolveExprs = append(resolveExprs, typ.X)
-	case *ast.IndexListExpr:
-		declareExprs = typ.Indices
-		resolveExprs = append(resolveExprs, typ.X)
-	default:
-		resolveExprs = append(resolveExprs, typ)
-	}
-	for _, expr := range declareExprs {
-		if id, _ := expr.(*ast.Ident); id != nil {
-			r.declare(expr, nil, r.topScope, ast.Typ, id)
-		} else {
-			// The receiver type parameter expression is invalid, but try to resolve
-			// it anyway for consistency.
-			resolveExprs = append(resolveExprs, expr)
-		}
-	}
-	for _, expr := range resolveExprs {
-		if expr != nil {
-			ast.Walk(r, expr)
-		}
-	}
-	// The receiver is invalid, but try to resolve it anyway for consistency.
-	for _, f := range recv.List[1:] {
-		if f.Type != nil {
-			ast.Walk(r, f.Type)
-		}
-	}
-}
-
-func (r *resolver) walkFieldList(list *ast.FieldList, kind ast.ObjKind) {
-	if list == nil {
-		return
-	}
-	r.resolveList(list)
-	r.declareList(list, kind)
-}
-
-// walkTParams is like walkFieldList, but declares type parameters eagerly so
-// that they may be resolved in the constraint expressions held in the field
-// Type.
-func (r *resolver) walkTParams(list *ast.FieldList) {
-	r.declareList(list, ast.Typ)
-	r.resolveList(list)
-}
-
-func (r *resolver) walkBody(body *ast.BlockStmt) {
-	if body == nil {
-		return
-	}
-	r.openLabelScope()
-	defer r.closeLabelScope()
-	r.walkStmts(body.List)
-}

runtime/_overlay/testing/testing.go

@@ -1 +0,0 @@
-package testing

runtime/build.go

@@ -22,6 +22,7 @@ var hasAltPkg = map[string]none{
 	"crypto/sha256":            {},
 	"crypto/sha512":            {},
 	"crypto/subtle":            {},
+	"go/build":                 {},
 	"go/parser":                {},
 	"hash/crc32":               {},
 	"hash/maphash":             {},

runtime/internal/clite/tls/tls_stub.go

@@ -0,0 +1,34 @@
+//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 tls
+
+// Handle is a no-op TLS handle used when building without the llgo tag.
+type Handle[T any] struct{}
+
+// Alloc returns a stub TLS handle that ignores all operations.
+func Alloc[T any](func(*T)) Handle[T] { return Handle[T]{} }
+
+// Get always returns the zero value.
+func (Handle[T]) Get() (zero T) { return zero }
+
+// Set is a no-op.
+func (Handle[T]) Set(T) {}
+
+// Clear is a no-op.
+func (Handle[T]) Clear() {}

runtime/internal/lib/go/build/build.go

@@ -0,0 +1,19 @@
+// Copyright 2024 The GoPlus Authors (goplus.org). All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package build provides alternative implementations for go/build.
+// We override build.Default.Compiler in an init function.
+
+package build
+
+import (
+	"go/build"
+)
+
+func init() {
+	// LLGO PATCH: Override build.Default.Compiler to be "gc" instead of "llgo"
+	// This prevents "unknown compiler" errors when user code uses go/build package
+	// Even though runtime.Compiler = "llgo", we set build.Default.Compiler = "gc"
+	build.Default.Compiler = "gc"
+}

runtime/internal/lib/internal/bytealg/bytealg.go

@@ -23,7 +23,7 @@ import (
 	"github.com/goplus/llgo/runtime/internal/runtime"
 )
 
-// llgo:skip init CompareString
+// llgo:skip init
 type _bytealg struct{}
 
 func IndexByte(b []byte, ch byte) int {

runtime/internal/lib/runtime/symtab.go

@@ -140,6 +140,10 @@ type Func struct {
 	opaque struct{} // unexported field to disallow conversions
 }
 
+func (f *Func) Name() string {
+	panic("todo")
+}
+
 // moduledata records information about the layout of the executable
 // image. It is written by the linker. Any changes here must be
 // matched changes to the code in cmd/link/internal/ld/symtab.go:symtab.

runtime/internal/runtime/defer_tls.go

@@ -0,0 +1,40 @@
+/*
+ * 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 runtime
+
+import "github.com/goplus/llgo/runtime/internal/clite/tls"
+
+var deferTLS = tls.Alloc[*Defer](func(head **Defer) {
+	if head != nil {
+		*head = nil
+	}
+})
+
+// SetThreadDefer associates the current thread with the given defer chain.
+func SetThreadDefer(head *Defer) {
+	deferTLS.Set(head)
+}
+
+// GetThreadDefer returns the current thread's defer chain head.
+func GetThreadDefer() *Defer {
+	return deferTLS.Get()
+}
+
+// ClearThreadDefer resets the current thread's defer chain to nil.
+func ClearThreadDefer() {
+	deferTLS.Clear()
+}

runtime/internal/runtime/z_defer_gc.go

@@ -0,0 +1,33 @@
+//go:build !nogc
+
+/*
+ * 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 runtime
+
+import (
+	"unsafe"
+
+	c "github.com/goplus/llgo/runtime/internal/clite"
+	"github.com/goplus/llgo/runtime/internal/clite/bdwgc"
+)
+
+// FreeDeferNode releases a defer argument node allocated from the Boehm heap.
+func FreeDeferNode(ptr unsafe.Pointer) {
+	if ptr != nil {
+		bdwgc.Free(c.Pointer(ptr))
+	}
+}

runtime/internal/runtime/z_defer_nogc.go

@@ -0,0 +1,32 @@
+//go:build nogc
+
+/*
+ * 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 runtime
+
+import (
+	"unsafe"
+
+	c "github.com/goplus/llgo/runtime/internal/clite"
+)
+
+// FreeDeferNode releases the defer node when GC integration is disabled.
+func FreeDeferNode(ptr unsafe.Pointer) {
+	if ptr != nil {
+		c.Free(ptr)
+	}
+}

runtime/internal/runtime/z_face.go

@@ -365,7 +365,7 @@ func NewItab(inter *InterfaceType, typ *Type) *Itab {
 		ret.fun[0] = 0
 	} else {
 		data := (*uintptr)(c.Advance(ptr, int(itabHdrSize)))
-		mthds := methods(u, inter.PkgPath_)
+		mthds := u.Methods()
 		for i, m := range inter.Methods {
 			fn := findMethod(mthds, m)
 			if fn == nil {
@@ -395,13 +395,6 @@ func findMethod(mthds []abi.Method, im abi.Imethod) abi.Text {
 	return nil
 }
 
-func methods(u *abi.UncommonType, from string) []abi.Method {
-	if u.PkgPath_ == from {
-		return u.Methods()
-	}
-	return u.ExportedMethods()
-}
-
 func IfaceType(i iface) *abi.Type {
 	if i.tab == nil {
 		return nil

runtime/internal/runtime/z_rt.go

@@ -109,18 +109,6 @@ const MaxZero = 1024
 
 var ZeroVal [MaxZero]byte
 
-// func init() {
-// 	signal.Signal(c.Int(syscall.SIGSEGV), func(v c.Int) {
-// 		switch syscall.Signal(v) {
-// 		case syscall.SIGSEGV:
-// 			panic(errorString("invalid memory address or nil pointer dereference"))
-// 		default:
-// 			var buf [20]byte
-// 			panic(errorString("unexpected signal value: " + string(itoa(buf[:], uint64(v)))))
-// 		}
-// 	})
-// }
-
 // -----------------------------------------------------------------------------
 
 type SigjmpBuf struct {

runtime/internal/runtime/z_signal.go

@@ -0,0 +1,48 @@
+//go:build !wasm && !baremetal
+
+/*
+ * 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 runtime
+
+import (
+	c "github.com/goplus/llgo/runtime/internal/clite"
+	"github.com/goplus/llgo/runtime/internal/clite/signal"
+)
+
+const (
+	// SIGSEGV is signal number 11 on all Unix-like systems (Linux, Darwin, BSD, etc.)
+	// Using a hardcoded constant avoids importing the syscall package, which would
+	// introduce dependencies on errors and internal/reflectlite packages that cause
+	// linking issues in c-shared and c-archive build modes.
+	SIGSEGV = c.Int(0xb)
+)
+
+// This file contains platform-specific runtime initialization for non-wasm targets.
+// The SIGSEGV signal handler enables Go-style panic recovery for nil pointer dereferences
+// instead of immediate process termination.
+//
+// For wasm platform compatibility, signal handling is excluded via build tags.
+// See PR #1059 for wasm platform requirements.
+func init() {
+	signal.Signal(SIGSEGV, func(v c.Int) {
+		if v == SIGSEGV {
+			panic(errorString("invalid memory address or nil pointer dereference"))
+		}
+		var buf [20]byte
+		panic(errorString("unexpected signal value: " + string(itoa(buf[:], uint64(v)))))
+	})
+}

runtime/overlay.go

@@ -7,27 +7,11 @@ import (
 //go:embed _overlay/runtime/runtime.go
 var fakeRuntime string
 
-//go:embed _overlay/go/parser/resolver.go
-var go_parser_resolver string
-
-//go:embed _overlay/testing/testing.go
-var testing_testing string
-
-//go:embed _overlay/testing/testing_go123.go
-var testing_testing_go123 string
-
-//go:embed _overlay/testing/testing_go124.go
-var testing_testing_go124 string
-
 //go:embed _overlay/net/textproto/textproto.go
 var net_textproto string
 
 var OverlayFiles = map[string]string{
 	"math/exp_amd64.go":          "package math;",
-	"go/parser/resolver.go":      go_parser_resolver,
-	"testing/testing.go":         testing_testing,
-	"testing/testing_go123.go":   testing_testing_go123,
-	"testing/testing_go124.go":   testing_testing_go124,
 	"net/textproto/textproto.go": net_textproto,
 	"runtime/runtime.go":         fakeRuntime,
 }

ssa/decl.go

@@ -294,7 +294,7 @@ func (p Function) NewBuilder() Builder {
 	// TODO(xsw): Finalize may cause panic, so comment it.
 	// b.Finalize()
 	return &aBuilder{b, nil, p, p.Pkg, prog,
-		make(map[Expr]dbgExpr), make(map[*types.Scope]DIScope)}
+		make(map[*types.Scope]DIScope)}
 }
 
 // HasBody reports whether the function has a body.

ssa/di.go

@@ -662,14 +662,8 @@ func (b diBuilder) createExpression(ops []uint64) DIExpression {
 
 // Copy to alloca'd memory to get declareable address.
 func (b Builder) constructDebugAddr(v Expr) (dbgPtr Expr, dbgVal Expr, exists bool) {
-	if v, ok := b.dbgVars[v]; ok {
-		return v.ptr, v.val, true
-	}
 	t := v.Type.RawType().Underlying()
 	dbgPtr, dbgVal = b.doConstructDebugAddr(v, t)
-	dbgExpr := dbgExpr{dbgPtr, dbgVal}
-	b.dbgVars[v] = dbgExpr
-	b.dbgVars[dbgVal] = dbgExpr
 	return dbgPtr, dbgVal, false
 }
 
@@ -874,11 +868,7 @@ func (b Builder) DebugFunction(f Function, pos token.Position, bodyPos token.Pos
 }
 
 func (b Builder) Param(idx int) Expr {
-	p := b.Func.Param(idx)
-	if v, ok := b.dbgVars[p]; ok {
-		return v.val
-	}
-	return p
+	return b.Func.Param(idx)
 }
 
 // -----------------------------------------------------------------------------

ssa/eh.go

@@ -91,6 +91,16 @@ func (p Program) tySiglongjmp() *types.Signature {
 	return p.sigljmpTy
 }
 
+// func() unsafe.Pointer
+func (p Program) tyStacksave() *types.Signature {
+	if p.stackSaveTy == nil {
+		paramPtr := types.NewParam(token.NoPos, nil, "", p.VoidPtr().raw.Type)
+		params := types.NewTuple(paramPtr)
+		p.stackSaveTy = types.NewSignatureType(nil, nil, nil, nil, params, false)
+	}
+	return p.stackSaveTy
+}
+
 func (b Builder) AllocaSigjmpBuf() Expr {
 	prog := b.Prog
 	n := unsafe.Sizeof(sigjmpbuf{})
@@ -98,6 +108,12 @@ func (b Builder) AllocaSigjmpBuf() Expr {
 	return b.Alloca(size)
 }
 
+// declare ptr @llvm.stacksave.p0()
+func (b Builder) StackSave() Expr {
+	fn := b.Pkg.cFunc("llvm.stacksave", b.Prog.tyStacksave())
+	return b.InlineCall(fn)
+}
+
 func (b Builder) Sigsetjmp(jb, savemask Expr) Expr {
 	if b.Prog.target.GOARCH == "wasm" {
 		return b.Setjmp(jb)
@@ -133,10 +149,6 @@ func (b Builder) Longjmp(jb, retval Expr) {
 
 // -----------------------------------------------------------------------------
 
-const (
-	deferKey = "__llgo_defer"
-)
-
 func (p Function) deferInitBuilder() (b Builder, next BasicBlock) {
 	b = p.NewBuilder()
 	next = b.setBlockMoveLast(p.blks[0])
@@ -146,7 +158,6 @@ func (p Function) deferInitBuilder() (b Builder, next BasicBlock) {
 
 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
 	rethPtr   Expr         // next block of Rethrow
@@ -158,30 +169,6 @@ type aDefer struct {
 	stmts     []func(bits Expr)
 }
 
-func (p Package) keyInit(name string) {
-	keyVar := p.VarOf(name)
-	if keyVar == nil {
-		return
-	}
-	prog := p.Prog
-	keyVar.InitNil()
-	keyVar.impl.SetLinkage(llvm.LinkOnceAnyLinkage)
-
-	b := p.afterBuilder()
-	eq := b.BinOp(token.EQL, b.Load(keyVar.Expr), prog.IntVal(0, prog.CInt()))
-	b.IfThen(eq, func() {
-		b.pthreadKeyCreate(keyVar.Expr, prog.Nil(prog.VoidPtr()))
-	})
-}
-
-func (p Package) newKey(name string) Global {
-	return p.NewVarEx(name, p.Prog.CIntPtr())
-}
-
-func (b Builder) deferKey() Expr {
-	return b.Load(b.Pkg.newKey(deferKey).Expr)
-}
-
 const (
 	// 0: addr sigjmpbuf
 	// 1: bits uintptr
@@ -214,17 +201,19 @@ func (b Builder) getDefer(kind DoAction) *aDefer {
 		blks := self.MakeBlocks(2)
 		procBlk, rethrowBlk := blks[0], blks[1]
 
-		key := b.deferKey()
 		zero := prog.Val(uintptr(0))
-		link := Expr{b.pthreadGetspecific(key).impl, prog.DeferPtr()}
+		link := b.Call(b.Pkg.rtFunc("GetThreadDefer"))
 		jb := b.AllocaSigjmpBuf()
-		ptr := b.aggregateAlloca(prog.Defer(), jb.impl, zero.impl, link.impl, procBlk.Addr().impl)
+		ptr := b.aggregateAllocU(prog.Defer(), jb.impl, zero.impl, link.impl, procBlk.Addr().impl)
 		deferData := Expr{ptr, prog.DeferPtr()}
-		b.pthreadSetspecific(key, deferData)
+		b.Call(b.Pkg.rtFunc("SetThreadDefer"), deferData)
 		bitsPtr := b.FieldAddr(deferData, deferBits)
 		rethPtr := b.FieldAddr(deferData, deferRethrow)
 		rundPtr := b.FieldAddr(deferData, deferRunDefers)
 		argsPtr := b.FieldAddr(deferData, deferArgs)
+		// Initialize the args list so later guards (e.g. DeferAlways/DeferInLoop)
+		// can safely detect an empty chain without a prior push.
+		b.Store(argsPtr, prog.Nil(prog.VoidPtr()))
 
 		czero := prog.IntVal(0, prog.CInt())
 		retval := b.Sigsetjmp(jb, czero)
@@ -237,7 +226,6 @@ func (b Builder) getDefer(kind DoAction) *aDefer {
 		b.If(b.BinOp(token.EQL, retval, czero), next, panicBlk)
 
 		self.defer_ = &aDefer{
-			key:       key,
 			data:      deferData,
 			bitsPtr:   bitsPtr,
 			rethPtr:   rethPtr,
@@ -262,8 +250,7 @@ func (b Builder) getDefer(kind DoAction) *aDefer {
 
 // DeferData returns the defer data (*runtime.Defer).
 func (b Builder) DeferData() Expr {
-	key := b.deferKey()
-	return Expr{b.pthreadGetspecific(key).impl, b.Prog.DeferPtr()}
+	return b.Call(b.Pkg.rtFunc("GetThreadDefer"))
 }
 
 // Defer emits a defer instruction.
@@ -278,14 +265,17 @@ func (b Builder) Defer(kind DoAction, fn Expr, args ...Expr) {
 	case DeferInCond:
 		prog = b.Prog
 		next := self.nextBit
+		if uintptr(next) >= unsafe.Sizeof(uintptr(0))*8 {
+			panic("too many conditional defers")
+		}
 		self.nextBit++
 		bits := b.Load(self.bitsPtr)
 		nextbit = prog.Val(uintptr(1 << next))
 		b.Store(self.bitsPtr, b.BinOp(token.OR, bits, nextbit))
 	case DeferAlways:
 		// nothing to do
-	default:
-		panic("todo: DeferInLoop is not supported - " + b.Func.Name())
+	case DeferInLoop:
+		// Loop defers rely on a dedicated drain loop inserted below.
 	}
 	typ := b.saveDeferArgs(self, fn, args)
 	self.stmts = append(self.stmts, func(bits Expr) {
@@ -298,6 +288,29 @@ func (b Builder) Defer(kind DoAction, fn Expr, args ...Expr) {
 			})
 		case DeferAlways:
 			b.callDefer(self, typ, fn, args)
+		case DeferInLoop:
+			prog := b.Prog
+			condBlk := b.Func.MakeBlock()
+			bodyBlk := b.Func.MakeBlock()
+			exitBlk := b.Func.MakeBlock()
+			// Control flow:
+			//   condBlk: check argsPtr for non-nil to see if there's work to drain.
+			//   bodyBlk: execute a single defer node, then jump back to condBlk.
+			//   exitBlk: reached when the list is empty (argsPtr == nil).
+			// This mirrors runtime's linked-list unwinding semantics for loop defers.
+
+			// jump to condition check before executing
+			b.Jump(condBlk)
+			b.SetBlockEx(condBlk, AtEnd, true)
+			list := b.Load(self.argsPtr)
+			has := b.BinOp(token.NEQ, list, prog.Nil(prog.VoidPtr()))
+			b.If(has, bodyBlk, exitBlk)
+
+			b.SetBlockEx(bodyBlk, AtEnd, true)
+			b.callDefer(self, typ, fn, args)
+			b.Jump(condBlk)
+
+			b.SetBlockEx(exitBlk, AtEnd, true)
 		}
 	})
 }
@@ -338,7 +351,7 @@ func (b Builder) saveDeferArgs(self *aDefer, fn Expr, args []Expr) Type {
 		flds[i+offset] = arg.impl
 	}
 	typ := prog.Struct(typs...)
-	ptr := Expr{b.aggregateMalloc(typ, flds...), prog.VoidPtr()}
+	ptr := Expr{b.aggregateAllocU(typ, flds...), prog.VoidPtr()}
 	b.Store(self.argsPtr, ptr)
 	return typ
 }
@@ -349,19 +362,28 @@ func (b Builder) callDefer(self *aDefer, typ Type, fn Expr, args []Expr) {
 		return
 	}
 	prog := b.Prog
-	ptr := b.Load(self.argsPtr)
-	data := b.Load(Expr{ptr.impl, prog.Pointer(typ)})
-	offset := 1
-	b.Store(self.argsPtr, Expr{b.getField(data, 0).impl, prog.VoidPtr()})
-	if fn.kind == vkClosure {
-		fn = b.getField(data, 1)
-		offset++
-	}
-	for i := 0; i < len(args); i++ {
-		args[i] = b.getField(data, i+offset)
-	}
-	b.Call(fn, args...)
-	b.free(ptr)
+	zero := prog.Nil(prog.VoidPtr())
+	list := b.Load(self.argsPtr)
+	has := b.BinOp(token.NEQ, list, zero)
+	// The guard is required because callDefer is reused by endDefer() after the
+	// list has been drained. Without this check we would dereference a nil
+	// pointer when no loop defers were recorded.
+	b.IfThen(has, func() {
+		ptr := b.Load(self.argsPtr)
+		data := b.Load(Expr{ptr.impl, prog.Pointer(typ)})
+		offset := 1
+		b.Store(self.argsPtr, Expr{b.getField(data, 0).impl, prog.VoidPtr()})
+		callFn := fn
+		if callFn.kind == vkClosure {
+			callFn = b.getField(data, 1)
+			offset++
+		}
+		for i := 0; i < len(args); i++ {
+			args[i] = b.getField(data, i+offset)
+		}
+		b.Call(callFn, args...)
+		b.Call(b.Pkg.rtFunc("FreeDeferNode"), ptr)
+	})
 }
 
 // RunDefers emits instructions to run deferred instructions.
@@ -415,7 +437,7 @@ func (p Function) endDefer(b Builder) {
 		}
 	}
 	link := b.getField(b.Load(self.data), deferLink)
-	b.pthreadSetspecific(self.key, link)
+	b.Call(b.Pkg.rtFunc("SetThreadDefer"), link)
 	b.IndirectJump(b.Load(rundPtr), nexts)
 
 	b.SetBlockEx(panicBlk, AtEnd, false) // panicBlk: exec runDefers and rethrow

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)
+	}
+}

ssa/package.go

@@ -195,6 +195,7 @@ type aProgram struct {
 	mallocTy       *types.Signature
 	freeTy         *types.Signature
 	memsetInlineTy *types.Signature
+	stackSaveTy    *types.Signature
 
 	createKeyTy *types.Signature
 	getSpecTy   *types.Signature
@@ -797,7 +798,6 @@ 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.keyInit(deferKey)
 	doAfterb := p.afterb != nil
 	doPyLoadModSyms := p.pyHasModSyms()
 	if doAfterb || doPyLoadModSyms {

ssa/ssa_test.go

@@ -60,6 +60,42 @@ func TestUnsafeString(t *testing.T) {
 	b.Return()
 }
 
+func TestTooManyConditionalDefers(t *testing.T) {
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	os.Chdir("../../runtime")
+	defer os.Chdir(wd)
+
+	prog := NewProgram(nil)
+	prog.SetRuntime(func() *types.Package {
+		fset := token.NewFileSet()
+		imp := packages.NewImporter(fset)
+		pkg, _ := imp.Import(PkgRuntime)
+		return pkg
+	})
+
+	pkg := prog.NewPackage("foo", "foo")
+	target := pkg.NewFunc("f", NoArgsNoRet, InGo)
+	fn := pkg.NewFunc("main", NoArgsNoRet, InGo)
+	fn.SetRecover(fn.MakeBlock())
+	b := fn.MakeBody(1)
+
+	defer func() {
+		if r := recover(); r == nil {
+			t.Fatal("expected panic: too many conditional defers")
+		} else if r != "too many conditional defers" {
+			t.Fatalf("unexpected panic: %v", r)
+		}
+	}()
+
+	b.Return()
+	for i := 0; i < 65; i++ {
+		b.Defer(DeferInCond, target.Expr)
+	}
+}
+
 func TestPointerSize(t *testing.T) {
 	expected := unsafe.Sizeof(uintptr(0))
 	if size := NewProgram(nil).PointerSize(); size != int(expected) {

ssa/stmt_builder.go

@@ -57,11 +57,6 @@ func (p BasicBlock) Addr() Expr {
 
 // -----------------------------------------------------------------------------
 
-type dbgExpr struct {
-	ptr Expr
-	val Expr
-}
-
 type aBuilder struct {
 	impl llvm.Builder
 	blk  BasicBlock
@@ -69,7 +64,6 @@ type aBuilder struct {
 	Pkg  Package
 	Prog Program
 
-	dbgVars      map[Expr]dbgExpr         // save copied address and values for debug info
 	diScopeCache map[*types.Scope]DIScope // avoid duplicated DILexicalBlock(s)
 }
 

test/defer_test.go

@@ -0,0 +1,326 @@
+/*
+ * 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 test
+
+import (
+	"reflect"
+	"strconv"
+	"testing"
+)
+
+// runLoopDefers exercises a defer statement inside a loop and relies on
+// defers executing after the loop but before the function returns.
+func runLoopDefers() (result []int) {
+	for i := 0; i < 3; i++ {
+		v := i
+		defer func() {
+			result = append(result, v)
+		}()
+	}
+	return
+}
+
+func runLoopDeferCount(n int) (count int) {
+	for i := 0; i < n; i++ {
+		defer func() {
+			count++
+		}()
+	}
+	return
+}
+
+func runDeferRecover() (recovered any, ran bool) {
+	defer func() {
+		recovered = recover()
+		ran = true
+	}()
+	panic("defer recover sentinel")
+}
+
+func runNestedLoopDeferOrder() (order []string) {
+	outerNestedLoop(&order)
+	return
+}
+
+func outerNestedLoop(order *[]string) {
+	for i := 0; i < 3; i++ {
+		v := i
+		label := "outer:" + strconv.Itoa(v)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+	}
+	middleNestedLoop(order)
+}
+
+func middleNestedLoop(order *[]string) {
+	for i := 0; i < 2; i++ {
+		v := i
+		label := "middle:" + strconv.Itoa(v)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+	}
+	innerNestedLoop(order)
+}
+
+func innerNestedLoop(order *[]string) {
+	for i := 0; i < 4; i++ {
+		v := i
+		label := "inner:" + strconv.Itoa(v)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+	}
+}
+
+func TestDeferInLoopOrder(t *testing.T) {
+	got := runLoopDefers()
+	want := []int{2, 1, 0}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("unexpected defer order: got %v, want %v", got, want)
+	}
+}
+
+func TestDeferLoopStress(t *testing.T) {
+	const n = 1_000_000
+	if got := runLoopDeferCount(n); got != n {
+		t.Fatalf("unexpected count: got %d, want %d", got, n)
+	}
+}
+
+func TestDeferRecoverHandlesPanic(t *testing.T) {
+	got, ran := runDeferRecover()
+	want := "defer recover sentinel"
+	if !ran {
+		t.Fatalf("recover defer not executed")
+	}
+	str, ok := got.(string)
+	if !ok {
+		t.Fatalf("recover returned %T, want string", got)
+	}
+	if str != want {
+		t.Fatalf("unexpected recover value: got %q, want %q", str, want)
+	}
+}
+
+func TestNestedDeferLoops(t *testing.T) {
+	got := runNestedLoopDeferOrder()
+	want := []string{
+		"inner:3", "inner:2", "inner:1", "inner:0",
+		"middle:1", "middle:0",
+		"outer:2", "outer:1", "outer:0",
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("unexpected nested order: got %v, want %v", got, want)
+	}
+}
+
+func runNestedConditionalDeferWithRecover() (order []string, recovered any) {
+	defer func() { recovered = recover() }()
+	nestedCondOuter(&order)
+	return
+}
+
+func nestedCondOuter(order *[]string) {
+	for i := 0; i < 3; i++ {
+		v := i
+		label := "outer:" + strconv.Itoa(v)
+		if v%2 == 0 {
+			defer func(label string) {
+				*order = append(*order, label)
+			}(label)
+		}
+		nestedCondMiddle(order, v)
+	}
+}
+
+func nestedCondMiddle(order *[]string, v int) {
+	for j := 0; j < 3; j++ {
+		u := j
+		label := "middle:" + strconv.Itoa(u)
+		if u < 2 {
+			defer func(label string) {
+				*order = append(*order, label)
+			}(label)
+		}
+		nestedCondInner(order)
+	}
+	if v == 1 {
+		panic("nested-conditional-boom")
+	}
+}
+
+func nestedCondInner(order *[]string) {
+	for k := 0; k < 2; k++ {
+		w := k
+		label := "inner:" + strconv.Itoa(w)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+	}
+}
+
+func TestNestedConditionalDeferWithRecover(t *testing.T) {
+	gotOrder, gotRecovered := runNestedConditionalDeferWithRecover()
+	wantRecovered := "nested-conditional-boom"
+	if s, ok := gotRecovered.(string); !ok || s != wantRecovered {
+		t.Fatalf("unexpected recover value: got %v, want %q", gotRecovered, wantRecovered)
+	}
+	wantOrder := []string{
+		"inner:1", "inner:0",
+		"inner:1", "inner:0",
+		"inner:1", "inner:0",
+		"middle:1", "middle:0",
+		"inner:1", "inner:0",
+		"inner:1", "inner:0",
+		"inner:1", "inner:0",
+		"middle:1", "middle:0",
+		"outer:0",
+	}
+	if !reflect.DeepEqual(gotOrder, wantOrder) {
+		t.Fatalf("unexpected nested conditional order: got %v, want %v", gotOrder, wantOrder)
+	}
+}
+
+func callWithRecover(fn func()) (recovered any) {
+	defer func() { recovered = recover() }()
+	fn()
+	return
+}
+
+func loopBranchEven(order *[]string, i int) {
+	label := "even:" + strconv.Itoa(i)
+	defer func() { *order = append(*order, label) }()
+}
+
+func loopBranchOddNoRecover(order *[]string, i int) {
+	label := "odd-wrap:" + strconv.Itoa(i)
+	defer func() { *order = append(*order, label) }()
+	panic("odd-no-recover")
+}
+
+func loopBranchOddLocalRecover(order *[]string, i int) {
+	label := "odd-local:" + strconv.Itoa(i)
+	defer func() { *order = append(*order, label) }()
+	defer func() { _ = recover() }()
+	panic("odd-local-recover")
+}
+
+func runLoopBranchRecoverMixed(n int) (order []string, recoveredVals []any) {
+	for i := 0; i < n; i++ {
+		if i%2 == 0 {
+			loopBranchEven(&order, i)
+		} else if i%4 == 3 {
+			rec := callWithRecover(func() { loopBranchOddNoRecover(&order, i) })
+			recoveredVals = append(recoveredVals, rec)
+		} else {
+			loopBranchOddLocalRecover(&order, i)
+		}
+	}
+	return
+}
+
+func TestLoopBranchRecoverMixed(t *testing.T) {
+	order, recovered := runLoopBranchRecoverMixed(6)
+	wantOrder := []string{
+		"even:0",
+		"odd-local:1",
+		"even:2",
+		"odd-wrap:3",
+		"even:4",
+		"odd-local:5",
+	}
+	if !reflect.DeepEqual(order, wantOrder) {
+		t.Fatalf("unexpected loop/branch order: got %v, want %v", order, wantOrder)
+	}
+	if len(recovered) != 1 {
+		t.Fatalf("unexpected recovered count: got %d, want %d", len(recovered), 1)
+	}
+	if s, ok := recovered[0].(string); !ok || s != "odd-no-recover" {
+		t.Fatalf("unexpected recovered value: got %v, want %q", recovered[0], "odd-no-recover")
+	}
+}
+
+func deepInner(order *[]string) {
+	for i := 0; i < 2; i++ {
+		idx := i
+		label := "inner:" + strconv.Itoa(idx)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+		if idx == 0 {
+			continue
+		}
+		panic("deep-boom")
+	}
+}
+
+func deepMiddle(order *[]string) {
+	for i := 0; i < 2; i++ {
+		idx := i
+		label := "middle:" + strconv.Itoa(idx)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+		if idx == 0 {
+			continue
+		}
+		defer func() {
+			if rec := recover(); rec != nil {
+				panic(rec)
+			}
+		}()
+		deepInner(order)
+	}
+}
+
+func deepOuter(order *[]string) (recovered any) {
+	for i := 0; i < 2; i++ {
+		idx := i
+		label := "outer:" + strconv.Itoa(idx)
+		defer func(label string) {
+			*order = append(*order, label)
+		}(label)
+		if idx == 0 {
+			continue
+		}
+		defer func() {
+			if rec := recover(); rec != nil {
+				recovered = rec
+			}
+		}()
+		deepMiddle(order)
+	}
+	return
+}
+
+func TestPanicCrossTwoFunctionsRecover(t *testing.T) {
+	var order []string
+	recovered := deepOuter(&order)
+	if s, ok := recovered.(string); !ok || s != "deep-boom" {
+		t.Fatalf("unexpected recovered value: got %v, want %q", recovered, "deep-boom")
+	}
+	wantOrder := []string{
+		"inner:1", "inner:0",
+		"middle:1", "middle:0",
+		"outer:1", "outer:0",
+	}
+	if !reflect.DeepEqual(order, wantOrder) {
+		t.Fatalf("unexpected cross-function defer order: got %v, want %v", order, wantOrder)
+	}
+}