build: fix unsafe.Sizeof for llgo:type C

internal/build/build.go

@@ -18,6 +18,7 @@ package build
 
 import (
 	"fmt"
+	"go/ast"
 	"go/constant"
 	"go/token"
 	"go/types"
@@ -136,6 +137,12 @@ func Do(args []string, conf *Config) {
 	prog := llssa.NewProgram(nil)
 	sizes := prog.TypeSizes
 	dedup := packages.NewDeduper()
+	dedup.SetPreload(func(pkg *types.Package, files []*ast.File) {
+		if canSkipToBuild(pkg.Path()) {
+			return
+		}
+		cl.ParsePkgSyntax(prog, pkg, files)
+	})
 
 	if patterns == nil {
 		patterns = []string{"."}
@@ -256,7 +263,6 @@ func buildAllPkgs(ctx *context, initial []*packages.Package, verbose bool) (pkgs
 		case cl.PkgDeclOnly:
 			// skip packages that only contain declarations
 			// and set no export file
-			cl.ParsePkgSyntax(ctx.prog, pkg.Types, pkg.Syntax)
 			pkg.ExportFile = ""
 		case cl.PkgLinkIR, cl.PkgLinkExtern, cl.PkgPyModule:
 			if len(pkg.GoFiles) > 0 {

internal/llgen/llgen.go

@@ -17,17 +17,10 @@
 package llgen
 
 import (
-	"go/ast"
-	"go/parser"
-	"go/token"
-	"go/types"
 	"os"
 
-	"github.com/goplus/gogen/packages"
 	"github.com/goplus/llgo/cl"
 	"github.com/goplus/llgo/internal/mod"
-	"golang.org/x/tools/go/ssa"
-	"golang.org/x/tools/go/ssa/ssautil"
 
 	llssa "github.com/goplus/llgo/ssa"
 )
@@ -45,51 +38,11 @@ func PkgPath(dir string) string {
 }
 
 func Do(pkgPath, inFile, outFile string) {
-	ret := Gen(pkgPath, inFile, nil)
+	ret := genFrom(inFile, pkgPath)
 	err := os.WriteFile(outFile, []byte(ret), 0644)
 	check(err)
 }
 
-func Gen(pkgPath, inFile string, src any) string {
-	fset := token.NewFileSet()
-	f, err := parser.ParseFile(fset, inFile, src, parser.ParseComments)
-	check(err)
-
-	files := []*ast.File{f}
-	name := f.Name.Name
-	if pkgPath == "" {
-		pkgPath = name
-	}
-	pkg := types.NewPackage(pkgPath, name)
-	imp := packages.NewImporter(fset)
-	ssaPkg, _, err := ssautil.BuildPackage(
-		&types.Config{Importer: imp}, fset, pkg, files, ssa.SanityCheckFunctions|ssa.InstantiateGenerics)
-	check(err)
-
-	if Verbose {
-		ssaPkg.WriteTo(os.Stderr)
-	}
-
-	prog := llssa.NewProgram(nil)
-	prog.SetRuntime(func() *types.Package {
-		ret, _ := imp.Import(llssa.PkgRuntime)
-		return ret
-	})
-	prog.SetPython(func() *types.Package {
-		ret, _ := imp.Import(llssa.PkgPython)
-		return ret
-	})
-
-	ret, err := cl.NewPackage(prog, ssaPkg, files)
-	check(err)
-
-	if prog.NeedPyInit { // call PyInit if needed
-		ret.PyInit()
-	}
-
-	return ret.String()
-}
-
 func check(err error) {
 	if err != nil {
 		panic(err)

internal/llgen/llgenf.go

@@ -17,6 +17,7 @@
 package llgen
 
 import (
+	"go/ast"
 	"go/types"
 	"os"
 	"os/exec"
@@ -60,12 +61,32 @@ func initRtAndPy(prog llssa.Program, cfg *packages.Config) {
 }
 
 func GenFrom(fileOrPkg string) string {
+	return genFrom(fileOrPkg, "")
+}
+
+func genFrom(fileOrPkg string, pkgPath string) string {
 	prog := llssa.NewProgram(nil)
 
 	cfg := &packages.Config{
 		Mode: loadSyntax | packages.NeedDeps,
 	}
-	initial, err := packages.LoadEx(nil, prog.TypeSizes, cfg, fileOrPkg)
+
+	dedup := packages.NewDeduper()
+	dedup.SetPkgPath(func(path, name string) string {
+		if path == "command-line-arguments" {
+			if pkgPath != "" {
+				path = pkgPath
+			} else {
+				path = name
+			}
+		}
+		return path
+	})
+	dedup.SetPreload(func(pkg *types.Package, files []*ast.File) {
+		cl.ParsePkgSyntax(prog, pkg, files)
+	})
+
+	initial, err := packages.LoadEx(dedup, prog.TypeSizes, cfg, fileOrPkg)
 	check(err)
 
 	_, pkgs := ssautil.AllPackages(initial, ssa.SanityCheckFunctions|ssa.InstantiateGenerics)

internal/packages/load.go

@@ -110,7 +110,9 @@ type Cached struct {
 }
 
 type aDeduper struct {
-	cache sync.Map
+	cache   sync.Map
+	setpath func(path string, name string) string
+	preload func(pkg *types.Package, syntax []*ast.File)
 }
 
 type Deduper = *aDeduper
@@ -119,6 +121,14 @@ func NewDeduper() Deduper {
 	return &aDeduper{}
 }
 
+func (p Deduper) SetPreload(fn func(pkg *types.Package, syntax []*ast.File)) {
+	p.preload = fn
+}
+
+func (p Deduper) SetPkgPath(fn func(path, name string) string) {
+	p.setpath = fn
+}
+
 func (p Deduper) Check(pkgPath string) *Cached {
 	if v, ok := p.cache.Load(pkgPath); ok {
 		return v.(*Cached)
@@ -186,6 +196,9 @@ func loadPackageEx(dedup Deduper, ld *loader, lpkg *loaderPackage) {
 				})
 			}
 		}()
+		if dedup.setpath != nil {
+			lpkg.PkgPath = dedup.setpath(lpkg.PkgPath, lpkg.Name)
+		}
 	}
 
 	// Call NewPackage directly with explicit name.
@@ -369,6 +382,10 @@ func loadPackageEx(dedup Deduper, ld *loader, lpkg *loaderPackage) {
 		panic("unreachable")
 	})
 
+	if dedup != nil && dedup.preload != nil {
+		dedup.preload(lpkg.Types, lpkg.Syntax)
+	}
+
 	// type-check
 	tc := &types.Config{
 		Importer: importer,