How to create GoSlice in php code?

[antropov-alexey]

Hi, i have .so file, generated from golang code:

package main

import "C"

import (
	"sort"
)

//export Sort
func Sort(vals []int) {
	sort.Ints(vals)
}
func main() {}

and I have .h file:

typedef long GoInt;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
extern void Sort(GoSlice vals);

i try to pass GoSlice from php to golang, but i get exception "Attempt to perform assign of owned C pointer":

<?php

$hFile  = __DIR__ . '/ffi.h';
$soFile = __DIR__ . '/ffi.so';

$ffi = \FFI::cdef(file_get_contents($hFile), $soFile);

var_dump(createGoSlice([1,2,3], $ffi);

function createGoSlice(array $data, \FFI $ffi)
{
    $slice       = $ffi->new('GoSlice');
    $slice->data = \FFI::new(\FFI::type('int[2]'));
    // $slice->data = \FFI::new(\FFI::arrayType(\FFI::type('int'), [2]));
    $slice->len  = count($data);
    $slice->cap  = count($data);

    return $slice;
}

How can i set property data of GoSlice?

[antropov-alexey]

Oh, I think I got it.

$slice->data = \FFI::addr(\FFI::new(\FFI::type('int[2]')));

This is works for me..

[antropov-alexey]

I have another question:

package main

import "C"

import (
	"fmt"
	"sort"
)

//export Sort
func Sort(vals []int) {
	fmt.Println(vals)
	sort.Ints(vals)
}
func main() {}

<?php

use FFI\CData;

$hFile  = __DIR__ . '/ffi.h';
$soFile = __DIR__ . '/ffi.so';

$ffi = \FFI::cdef(file_get_contents($hFile), $soFile);

$data = $ffi->new('int[2]');

$data[0] = 12;
$data[1] = 11;

$ffi->Sort(createGoSlice($data, $ffi));

function createGoSlice(CData $data, \FFI $ffi)
{
    $slice       = $ffi->new('GoSlice');
    $slice->data = \FFI::addr($data);
    $slice->len  = count($data);
    $slice->cap  = count($data);

    return $slice;
}

i get

[47244640268 140456222825824]

Are they pointers? Do I need to use int[] or something else in golang?

[dstogov]

I have no idea about Go calling convention. ext/ffi supports only C calling convention. Look into your ffi.h and follow its definitions (I assume ffi.h is correct).