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fix TestBindSimple and TestBindCgoPackage #386

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ef7b4bc
WIP
b-long Apr 16, 2026
c91ad4c
expand test coverage
b-long Apr 17, 2026
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2 changes: 1 addition & 1 deletion _examples/cgo/cgo.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ package cgo
//#include <string.h>
//#include <stdlib.h>
//const char* cpkg_sprintf(const char *str) {
// char *o = (char*)malloc(strlen(str));
// char *o = (char*)malloc(strlen(str) + 1);
// sprintf(o, "%s", str);
// return o;
//}
Expand Down
31 changes: 23 additions & 8 deletions bind/gen_func.go
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Expand Up @@ -263,7 +263,18 @@ func (g *pyGen) genFuncBody(sym *symbol, fsym *Func) {

// release GIL
g.gofile.Printf("_saved_thread := C.PyEval_SaveThread()\n")
if !rvIsErr && nres != 2 {
// Use defer only when there is no go2py return conversion that calls
// Python C API (which requires the GIL to already be reacquired).
// For go2py returns (excluding handle types) and error/multi-return cases,
// we restore explicitly. Handle types use handleFromPtr which is pure Go
// and doesn't need the GIL, so they can keep using defer.
nresForDefer := nres
// hasRetCvt fires when go2py != "" and NOT (hasHandle && !isPtrOrIface).
// Suppress defer in exactly those cases so the explicit restore below is the only one.
if nres > 0 && res[0].sym.go2py != "" && !(res[0].sym.hasHandle() && !res[0].sym.isPtrOrIface()) {
nresForDefer = 2 // treat like nres==2: no defer, explicit restore
}
if !rvIsErr && nresForDefer != 2 {
// reacquire GIL after return
g.gofile.Printf("defer C.PyEval_RestoreThread(_saved_thread)\n")
}
Expand Down Expand Up @@ -357,8 +368,8 @@ if __err != nil {
g.pywrap.Printf("_%s.%s(", pkgname, mnm)
}

hasRetCvt := false
hasAddrOfTmp := false
hasRetCvt := false
if nres > 0 {
ret := res[0]
switch {
Expand All @@ -370,8 +381,10 @@ if __err != nil {
hasAddrOfTmp = true
g.gofile.Printf("cret := ")
case ret.sym.go2py != "":
// Assign to cret first; we'll restore the GIL before calling go2py
// so that Python C API functions inside go2py run with the GIL held.
hasRetCvt = true
g.gofile.Printf("return %s(", ret.sym.go2py)
g.gofile.Printf("cret := ")
default:
g.gofile.Printf("return ")
}
Expand All @@ -394,11 +407,6 @@ if __err != nil {
} else {
funCall = fmt.Sprintf("%s(%s)", fsym.GoFmt(), strings.Join(callArgs, ", "))
}
if hasRetCvt {
ret := res[0]
funCall += fmt.Sprintf(")%s", ret.sym.go2pyParenEx)
}

if nres == 0 {
g.gofile.Printf("if boolPyToGo(goRun) {\n")
g.gofile.Indent()
Expand All @@ -413,6 +421,13 @@ if __err != nil {
g.gofile.Printf("%s\n", funCall)
}

if hasRetCvt {
// Restore GIL before calling go2py, which may call Python C API.
ret := res[0]
g.gofile.Printf("C.PyEval_RestoreThread(_saved_thread)\n")
g.gofile.Printf("return %s(cret)%s\n", ret.sym.go2py, ret.sym.go2pyParenEx)
}

if rvIsErr || nres == 2 {
g.gofile.Printf("\n")
// reacquire GIL
Expand Down
6 changes: 5 additions & 1 deletion bind/gen_map.go
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Expand Up @@ -317,7 +317,11 @@ otherwise parameter is a python list that we copy from
g.gofile.Outdent()
g.gofile.Printf("}\n\n")

g.pybuild.Printf("mod.add_function('%s_elem', retval('%s'), [param('%s', 'handle'), param('%s', '_ky')])\n", slNm, esym.cpyname, PyHandle, ksym.cpyname)
if esym.go2py == "C.CString" {
g.pybuild.Printf("add_checked_string_function(mod, '%s_elem', retval('%s'), [param('%s', 'handle'), param('%s', '_ky')])\n", slNm, esym.cpyname, PyHandle, ksym.cpyname)
} else {
g.pybuild.Printf("mod.add_function('%s_elem', retval('%s'), [param('%s', 'handle'), param('%s', '_ky')])\n", slNm, esym.cpyname, PyHandle, ksym.cpyname)
}

// contains
g.gofile.Printf("//export %s_contains\n", slNm)
Expand Down
6 changes: 5 additions & 1 deletion bind/gen_slice.go
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Original file line number Diff line number Diff line change
Expand Up @@ -345,7 +345,11 @@ otherwise parameter is a python list that we copy from
caller_owns_ret = ", caller_owns_return=True"
transfer_ownership = ", transfer_ownership=False"
}
g.pybuild.Printf("mod.add_function('%s_elem', retval('%s'%s), [param('%s', 'handle'), param('int', 'idx')])\n", slNm, esym.cpyname, caller_owns_ret, PyHandle)
if esym.go2py == "C.CString" {
g.pybuild.Printf("add_checked_string_function(mod, '%s_elem', retval('%s'), [param('%s', 'handle'), param('int', 'idx')])\n", slNm, esym.cpyname, PyHandle)
} else {
g.pybuild.Printf("mod.add_function('%s_elem', retval('%s'%s), [param('%s', 'handle'), param('int', 'idx')])\n", slNm, esym.cpyname, caller_owns_ret, PyHandle)
}

if slc.isSlice() {
g.gofile.Printf("//export %s_subslice\n", slNm)
Expand Down
6 changes: 5 additions & 1 deletion bind/gen_struct.go
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Original file line number Diff line number Diff line change
Expand Up @@ -227,7 +227,11 @@ func (g *pyGen) genStructMemberGetter(s *Struct, i int, f types.Object) {
g.gofile.Outdent()
g.gofile.Printf("}\n\n")

g.pybuild.Printf("mod.add_function('%s', retval('%s'), [param('%s', 'handle')])\n", cgoFn, ret.cpyname, PyHandle)
if ret.go2py == "C.CString" {
g.pybuild.Printf("add_checked_string_function(mod, '%s', retval('%s'), [param('%s', 'handle')])\n", cgoFn, ret.cpyname, PyHandle)
} else {
g.pybuild.Printf("mod.add_function('%s', retval('%s'), [param('%s', 'handle')])\n", cgoFn, ret.cpyname, PyHandle)
}
}

func (g *pyGen) genStructMemberSetter(s *Struct, i int, f types.Object) {
Expand Down
4 changes: 4 additions & 0 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,13 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
golang.org/x/mod v0.22.0 h1:D4nJWe9zXqHOmWqj4VMOJhvzj7bEZg4wEYa759z1pH4=
golang.org/x/mod v0.22.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/telemetry v0.0.0-20240521205824-bda55230c457/go.mod h1:pRgIJT+bRLFKnoM1ldnzKoxTIn14Yxz928LQRYYgIN0=
golang.org/x/tools v0.29.0 h1:Xx0h3TtM9rzQpQuR4dKLrdglAmCEN5Oi+P74JdhdzXE=
golang.org/x/tools v0.29.0/go.mod h1:KMQVMRsVxU6nHCFXrBPhDB8XncLNLM0lIy/F14RP588=
8 changes: 6 additions & 2 deletions main_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ import (
"os/exec"
"path/filepath"
"reflect"
"runtime"
"sort"
"strings"
"testing"
Expand Down Expand Up @@ -316,7 +317,6 @@ OK
}

func TestBindSimple(t *testing.T) {
t.Skip("Skipping due to Go 1.21+ CGO issue (see https://github.com/go-python/gopy/issues/370)")
// t.Parallel()
path := "_examples/simple"
testPkg(t, pkg{
Expand Down Expand Up @@ -546,7 +546,11 @@ OK
}

func TestBindCgoPackage(t *testing.T) {
t.Skip("Skipping due to Go 1.21+ CGO issue (see https://github.com/go-python/gopy/issues/370)")
// Skip for some Go versions due to CGO issue
// See: https://github.com/go-python/gopy/issues/370
if strings.HasPrefix(runtime.Version(), "go1.23") {
t.Skip("Skipping due to CGO issue (see https://github.com/go-python/gopy/issues/370)")
}
// t.Parallel()
path := "_examples/cgo"
testPkg(t, pkg{
Expand Down
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