66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
package main
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import (
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"unsafe"
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"github.com/goplus/llgo/c"
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"github.com/goplus/llgo/c/ffi"
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)
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const (
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LLGoPackage = "link"
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LLGoFiles = "../_wrap/wrap.c"
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)
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//llgo:type C
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type Callback func(array) c.Int
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//go:linkname demo1 C.demo1
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func demo1(array) c.Int
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//go:linkname demo2 C.demo2
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func demo2(fn Callback) c.Int
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//llgo:type C
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type array struct {
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x c.Int
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y c.Int
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z c.Int
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k c.Int
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}
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var (
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typeInt32 = &ffi.Type{4, 4, ffi.Sint32, nil}
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typePointer = &ffi.Type{unsafe.Sizeof(0), uint16(unsafe.Alignof(0)), ffi.Pointer, nil}
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)
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func main() {
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cdemo1()
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cdemo2()
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}
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func cdemo1() {
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var cif ffi.Cif
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tarray := &ffi.Type{0, 0, ffi.Struct, &[]*ffi.Type{typeInt32, typeInt32, typeInt32, typeInt32, nil}[0]}
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status := ffi.PrepCif(&cif, ffi.DefaultAbi, 1, typeInt32, &[]*ffi.Type{tarray}[0])
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if status != ffi.OK {
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panic(status)
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}
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ar := array{1, 2, 3, 4}
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var ret int32
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ffi.Call(&cif, c.Func(demo1), unsafe.Pointer(&ret), &[]unsafe.Pointer{unsafe.Pointer(&ar)}[0])
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c.Printf(c.Str("ret: %d\n"), ret)
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}
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func cdemo2() {
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var cif ffi.Cif
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status := ffi.PrepCif(&cif, ffi.DefaultAbi, 1, typeInt32, &[]*ffi.Type{typePointer}[0])
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if status != ffi.OK {
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panic(status)
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}
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var ret int32
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fn := c.Func(demo1)
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ffi.Call(&cif, c.Func(demo2), unsafe.Pointer(&ret), &[]unsafe.Pointer{unsafe.Pointer(&fn)}[0])
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c.Printf(c.Str("ret: %d\n"), ret)
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}
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