func TestB(t *testing.T) {
	if BFunc() == 1010101 {
		t.Fatalf("bad!")
	}
}
-- c/c.go --
package c

var G int

func CFunc(x, y int) int {
	G += x
	G -= y
	return x + y
}
-- c/c_test.go --
package c

import "testing"

func TestC(t *testing.T) {
	if CFunc(10, 10) == 1010101 {
		t.Fatalf("bad!")
	}
}
-- d/d.go --
package d

const FortyTwo = 42

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

// extern int CFunc(void);
import "C"

import (
	"fmt"
	"os"
)

func main() {
	got := C.CFunc()
	const want = (1 << 8) | 2
	if got != want {
		fmt.Printf("got %#x, want %#x\n", got, want)
		os.Exit(1)
	}

// Copyright 2018 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.

#include "libtestgo2c2go.h"

int CFunc(void) {
	return (GoFunc() << 8) + 2;

// license that can be found in the LICENSE file.

package main

//#include <errno.h>
//#include <string.h>
import "C"

// #include
// void cfunc() {} // uses cgo_topofstack

import (
	"reflect"
	"strings"

	"testplugin/common"
)

func init() {
	_ = strings.NewReplacer() // trigger stack unwind, Issue #18190.
	C.strerror(C.EIO)         // uses cgo_topofstack
	common.X = 2
}

type uint8Pair struct{ x, y uint8 }

var cbFuncs = []cbFunc{
	{func(i1, i2 uintptr) uintptr {
		return i1 + i2
	}},
	{func(i1, i2, i3 uintptr) uintptr {
		return i1 + i2 + i3
	}},
	{func(i1, i2, i3, i4 uintptr) uintptr {
		return i1 + i2 + i3 + i4
	}},
	{func(i1, i2, i3, i4, i5 uintptr) uintptr {
		return i1 + i2 + i3 + i4 + i5
	}},
	{func(i1, i2, i3, i4, i5, i6 uintptr) uintptr {

			}

			if autosize == 0 && c.cursym.Func().Text.Mark&LEAF == 0 {
				if c.cursym.Func().Text.From.Sym.NoSplit() {
					if ctxt.Debugvlog {
						ctxt.Logf("save suppressed in: %s\n", c.cursym.Name)
					}

					c.cursym.Func().Text.Mark |= LEAF
				}
			}

			p.To.Offset = int64(autosize) - ctxt.Arch.FixedFrameSize

			if c.cursym.Func().Text.Mark&LEAF != 0 {
				c.cursym.Set(obj.AttrLeaf, true)

	pcdata = cursym.Func().SpillRegisterArgs(spill, newprog)

	call := obj.Appendp(pcdata, newprog)
	call.Pos = cursym.Func().Text.Pos
	call.As = obj.ACALL
	call.To.Type = obj.TYPE_BRANCH
	call.To.Name = obj.NAME_EXTERN
	morestack := "runtime.morestack"
	switch {
	case cursym.CFunc():
		morestack = "runtime.morestackc"
	case !cursym.Func().Text.From.Sym.NeedCtxt():

	}
	if s.CFunc() {
		fmt.Fprintf(ctxt.Bso, "cfunc ")
	}
	if s.NoSplit() {
		fmt.Fprintf(ctxt.Bso, "nosplit ")
	}
	if s.Func() != nil && s.Func().FuncFlag&abi.FuncFlagTopFrame != 0 {
		fmt.Fprintf(ctxt.Bso, "topframe ")
	}
	if s.Func() != nil && s.Func().FuncFlag&abi.FuncFlagAsm != 0 {
		fmt.Fprintf(ctxt.Bso, "asm ")
	}
	fmt.Fprintf(ctxt.Bso, "size=%d", s.Size)
	if s.Type == objabi.STEXT {

const (
	FOLL  = 1 << 0
	LABEL = 1 << 1
	LEAF  = 1 << 2
)

func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	autosize := int32(0)

	if cursym.Func().Text == nil || cursym.Func().Text.Link == nil {
		return
	}

	c := ctxt5{ctxt: ctxt, cursym: cursym, newprog: newprog}

	p := c.cursym.Func().Text
	autoffset := int32(p.To.Offset)
	if autoffset == -4 {

	} else {
		return
	}
	obj.Nopout(p)
}

func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	// TODO(minux): add morestack short-cuts with small fixed frame-size.
	if cursym.Func().Text == nil || cursym.Func().Text.Link == nil {
		return
	}

	c := ctxtz{ctxt: ctxt, cursym: cursym, newprog: newprog}

	p := c.cursym.Func().Text
	textstksiz := p.To.Offset
	if textstksiz == -8 {