feat:ZeroLit for alias

[luoliwoshang]

fix unexpected zero lit for alias type

---

without alias support in ZeroLit,will cause unexpect zerolit for a bulitin type's alias,like use goplus/llgo/c.Double

Error: ./cJSON.go:129:9: invalid composite literal type c.Double
Error: ./cJSON.go:406:9: invalid composite literal type c.Double
Error: /Users/runner/work/llcppg/llcppg/_llcppgtest/cjson/out/cjson/cJSON.go:129:9: invalid composite literal type float64
Error: /Users/runner/work/llcppg/llcppg/_llcppgtest/cjson/out/cjson/cJSON.go:406:9: invalid composite literal type float64

https://github.com/goplus/llcppg/actions/runs/14375203222/job/40305873425?pr=244

support goplus/llcppg#244

reproduce

package main

import (
	"go/token"
	"go/types"
	"os"

	"github.com/goplus/gogen"
)

func main() {
	pkg := gogen.NewPackage("", "temp", &gogen.Config{
		EnableTypesalias: true,
	})
	clib := pkg.Import("github.com/goplus/llgo/c")
	cdouble := clib.Ref("Double").Type()
	signature := types.NewSignatureType(nil, nil, nil, nil, types.NewTuple(types.NewVar(token.NoPos, pkg.Types, "", cdouble)), false)
	pkg.NewFuncDecl(token.NoPos, "test", signature).BodyStart(pkg).
		ZeroLit(cdouble).Return(1).End()
	pkg.WriteTo(os.Stdout)
}

go.mod

module test

go 1.23.4

require github.com/goplus/gogen v1.16.9

require (
	github.com/goplus/llgo v0.10.0 // indirect
	golang.org/x/tools v0.19.0 // indirect
)

replace golang.org/x/tools => golang.org/x/tools v0.30.0

note:use replace golang.org/x/tools => golang.org/x/tools v0.30.0 to ref a alias's name instead it's origin type.
without this replace the hello

package temp

type hello float64

with this replace,we can refer the actual alias type

package temp

import "github.com/goplus/llgo/c"

type hello c.Double

but in this case,we will get a error zerolit of c.Double

package temp

import "github.com/goplus/llgo/c"

type hello c.Double

func test() c.Double {
        return c.Double{}
}

invalid composite literal type c.Double compiler[InvalidLit](https://pkg.go.dev/golang.org/x/tools/internal/typesinternal#InvalidLit)

with this pr,we can got a correct alias zerolit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.00%. Comparing base (ba6f4f0) to head (f2fbfc3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #489   +/-   ##
=======================================
  Coverage   96.00%   96.00%           
=======================================
  Files          21       21           
  Lines        7156     7159    +3     
=======================================
+ Hits         6870     6873    +3     
  Misses        222      222           
  Partials       64       64           

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[visualfc]

typesutil.Alias

[luoliwoshang]

Done

[visualfc]

上面的 go work init 自动加入了 go 1.23/1.24 默认为 typesalias 环境。

[luoliwoshang]

Done