diff options
Diffstat (limited to 'libgo/go/runtime/ffi.go')
| -rw-r--r-- | libgo/go/runtime/ffi.go | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/libgo/go/runtime/ffi.go b/libgo/go/runtime/ffi.go index cd8479e..86ce5b8 100644 --- a/libgo/go/runtime/ffi.go +++ b/libgo/go/runtime/ffi.go @@ -4,6 +4,7 @@ // Only build this file if libffi is supported. +//go:build libffi // +build libffi package runtime @@ -221,9 +222,6 @@ func stringToFFI() *__ffi_type { // structToFFI returns an ffi_type for a Go struct type. func structToFFI(typ *structtype) *__ffi_type { c := len(typ.fields) - if c == 0 { - return emptyStructToFFI() - } if typ.typ.kind&kindDirectIface != 0 { return ffi_type_pointer() } @@ -231,6 +229,7 @@ func structToFFI(typ *structtype) *__ffi_type { fields := make([]*__ffi_type, 0, c+1) checkPad := false lastzero := false + sawnonzero := false for i, v := range typ.fields { // Skip zero-sized fields; they confuse libffi, // and there is no value to pass in any case. @@ -239,10 +238,13 @@ func structToFFI(typ *structtype) *__ffi_type { // next field. if v.typ.size == 0 { checkPad = true - lastzero = true + if v.name == nil || *v.name != "_" { + lastzero = true + } continue } lastzero = false + sawnonzero = true if checkPad { off := uintptr(0) @@ -263,6 +265,10 @@ func structToFFI(typ *structtype) *__ffi_type { fields = append(fields, typeToFFI(v.typ)) } + if !sawnonzero { + return emptyStructToFFI() + } + if lastzero { // The compiler adds one byte padding to non-empty struct ending // with a zero-sized field (types.cc:get_backend_struct_fields). |